CA1301382C - Display unit - Google Patents
Display unitInfo
- Publication number
- CA1301382C CA1301382C CA000544903A CA544903A CA1301382C CA 1301382 C CA1301382 C CA 1301382C CA 000544903 A CA000544903 A CA 000544903A CA 544903 A CA544903 A CA 544903A CA 1301382 C CA1301382 C CA 1301382C
- Authority
- CA
- Canada
- Prior art keywords
- electrodes
- axis
- current
- display
- display unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0441—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using active external devices, e.g. active pens, for receiving changes in electrical potential transmitted by the digitiser, e.g. tablet driving signals
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
M14-45016M(F-4749-03)/MS
ABSTRACT OF THE DISCLOSURE
In a display unit comprising a plate-shaped display panel with X-Y matrix electrodes consisting of two groups of electrodes, X-axis electrodes and Y-axis elec-trodes, display signals are applied to the X-Y matrix electrodes, a.c. current is applied to at least one group of electrodes one after another, and the phase of the a c.
current is compared with that of the output of an input pen having means for detecting the magnetic flux induced by the a.c. current, so that the position of the input pen on the display panel is detected from the result of the comparison.
ABSTRACT OF THE DISCLOSURE
In a display unit comprising a plate-shaped display panel with X-Y matrix electrodes consisting of two groups of electrodes, X-axis electrodes and Y-axis elec-trodes, display signals are applied to the X-Y matrix electrodes, a.c. current is applied to at least one group of electrodes one after another, and the phase of the a c.
current is compared with that of the output of an input pen having means for detecting the magnetic flux induced by the a.c. current, so that the position of the input pen on the display panel is detected from the result of the comparison.
Description
; ~ .
~3~3~3;2 DISPLAY UNIT
BP~CKGROUND OF THE INVEWTION
..... _ ,, , _ _ This invention relates to a display unit for an electronic computer, and more particularly to a display unit serving as interactive means between an electronic computer and the operator, whose planar display panel can be used as a coordinate input surface.
A display unit with a data inputting function whose planar display panel can be used to input coordina~es has been disclosed by Japanese Patent Application Lai~-Opqn No. 31127/81. The conventional data input type dis~
. p~ay unit is as shown in FIG. 6.
In FIG. 6, reference numeral 400 designat:es aliquid crystal panel; 500, a transparent touch panel switch, and 600, a controller. FIG. 7 is a sectional view of the transparent touch panel switch 500. In FIG. 7, refere.nce ~umeral 501 designates an upper transparent film substrate;
502, belt~shaped X-axis transparent electrodes laid on the upper transparent film substrate 501 in such a manner that ~hey are in parallel with one another; 503, a lower trans-parent film substrate; 504 t belt-shaped Y-axis transpar~nt electrodes laid on the lower transparent film subs~rate 503 in such a manner that they are in parallel with one another and perpendicular to the X-axis transparent electrodes .
13~
502;,and 505, a spacer in the form of a transparent sheet having holes at the intersections of the X-axis transparent electrodes 502 and the Y-axis transparent electrodes 5~4O
The operation of the display unit thus constructed will be described. An operation of displaying imases on the liquid crystal panel 400 is carrled out in the conv~n-tional'manner. The transparent touch panel switch 500 operates as follows: When the operator tauches the sur~ace of the transparent touch panel switch 500 with his finger or a writing pen, ths X-axis transparent electrode 502 and the Y-axis transparent electrode.504 are brought into con-t~ct with each other through the hole of the spacer 505 at , the part of the surface of the panel switch 500 which has been touched by the operator. Under this condition, the ,: 15 controller 600 sc,ans all the X-axis transparent electrodes .~ 502 and all the Y-axis transparent electrodes 504 o~ th~
transparent touch panel switch 500 to detect conduction or nonconduct~n. at the intersections of the X-axis and Y-axis transparent electrod s 502 and 504, thereby to detect the position'on the surface of the l~quid crystal panel 4~0 which has been indicatqd with the finger or writing pen.
The conventio~al display unit described aboYe suffers from the following difficulties: The display unit , is so designed that the image displayed on the liquid crystal panel is observed through ~he transparent touch panel, and .
.
, - : :
;
~L3~382 therefore the display quality is lowered as much. This difficulty may be overcome by increasing the resolution of the transparent touch panel switch substantially to that of picture elements displayed. However, employment of the method results in increasing the manufacturing cost of the display unit, and gives rise to another problem that the transparent touch panel switch and the liquid crystal panel must be accurately aligned with each other in display dot position.
. SUMMARY QF q:HE IMV.E~ITION
Accordingly, an object of this invention is to eliminate the above-described difficulties accompanying a conventional display unit with a data inputting function.
More specifically, an object of the invention is to provide a display unit having a data inputting function which is high ln display quality, low in manufacturing cost and high in position detection accuracy.
The foregoing object and other objects of the invention have been achieved by the provision of a display unit which, according to the invention, comprises; a flat-plate-shaped display panel having X-Y matrix electrodes con-sisting of two groups of electrodes which are arranged in matrlx form; displaying~signal applying means for applying displaying signals to the X-Y matrix electrodes; current applying means for applying a current having a.c. components : '~ ':'' ' ' ':
~3~
~o at least one group of electrodes in such a manner that the current flows in the electrodes one after another; an input pen with magnetic flux detecting means; phase compari-son means for comparing the phase of the current applied to the electrodes with that of the output signal of the magnetic flux detecting means; and position detecting means for detecting the position of the input pen on the display panel according to the output signal of the phase comparison means.
A display unit according to the present :invention can function in a display mode an~ a position detecting mode in accordance with the kind of the signal app:ied to the matrix electrodes. When an à.c. current is applied to the matrix electrodes successively in the position detecting mode, the phases of the signals outputted from the ma~netic flux detecting means included in the pen ~re different in phase between a case in which the current is applied to one group of the electrodes and a case in which the current is applied to the ~ther group of the electrodes with the posi-tlon of the pen having the magnetic flux detecting mean~ asa boundary. Accordingly, the position of the magnetic ~lux detecting means can be detected by detecting the point of ~he phase change.
The nature, principle and utility of the invention will become more apparent from the following detailed 13~138~
description when read in conjunction with the accompanying drawings, in which like parts are designated by like refer-- ence numerals or characters.
BRIEF DESCRIPTION OF THE l)RAWINGS
In the accompanying drawings:
FIG. 1 is an explanatory diagrams, partly as a blOck diagram, showing the arrangement o~ one example of a di.~play unit according to this invention;
. FIG. 2 is an explanatory diagram, partly as a block diagram, for a description of the position detecting ~:. operation of the display unit according to the invention;
FIG. 3 is. a diagram showing the truth table of Y-axis drivers~in FIG. 2;
FIG. 4 is a diagra~ for a description o~ the time division for a di~play mode and a position detection mode ~: in the display unit of the in~rention;
~IG. 5 is a time chart showing essentlal output signals in the circuit of FIG. 2;
FIG. 6 is an external view of a conventional dis 20 play unit having a data inputting ~unction; and FIG. 7 is a sectional view of a transparent touch panel switch in the conventional display unit vf FIG. 7.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A display unit according t~ this invention, as - ; 25 shown in FIG. l, comprises: a TN mode display liquLd crystal ..
~ ~ 5 - .
, ;
~3~:)138;~
cell 1 ~plahax display panel~ made up of belt-shaped X-axis transparent electrodes 11 and belt-shaped ~-axis transparent electrodes 12 which are arranged perpendicular to each othe~
and the driven through their ends by signals; X-axis drivers S 21 and 22; Y-axis drivers ~1 and 32; an input pen 4 made up of a pickup coil wound on a ferrite core, and a head amplï~
fier 41, a memory 5 for storing a pattern ~o be displayed on the li~uid crystal cel]. l; and a liquid crystal dis~lay. con-troller 6 for reading out of the memory 5 pattern dcnta in.
the X-axis direction which correspond to the Y-axis trans-parent electrodes 12 selected, and.transferring thenl to the X-axis drivers 21 and 22.
The display further comprises; a position detect-ing circuit 7 which outputs a detection signal in`response lS to the output signal of the inputting pen 4;`a posit.ion de-tection scanning circuit 8; and an input/output mode con-troller 9 operating as switching means for applying display data and cohtrol signals provided by the liquid crystal controller 6 to the X-axis drivers 21 and 22 and the Y-axis drivers 31 and 32 in a display mode, and applying signals provided by the position detection scanning circuit 8 to the : X-axis drivers 21 and 22 and the Y-axis drivers 31 and 32 in a position detection mode. In FIG. 1, reference numeral 10 designates a CPU (central processing unit) ~or control-ling the operation of the display unit, for instance writingdisplay patterns in the memory 5.
~L3~31382 FIG. 2 shows the arrangement of the display unit in the position detection mode in more detail. In FIG. 2, ~ reference numeral aoo designates a clock generator whose output terminal is connected to the clock input terminals CK of the Y-axis drivers 31 and 32 through the input/output mode controller 9, and to the input terminal of a frequency dividex 801 and to the clock input terminal CK of a counter 802. The output terminal of the frequency divider ~301 i5 connected to the data input terminals D of the Y-ax:is driv-ers 31 and 32, and to the start terminal S of the counter802. Further in FIG. 2, reference-numeral 803 desiqnates a latch circuit for latching the output of the counl:er 802 with the aid of a latch pulse ~Q); 804, a sine wave gener-ator for generating a sine wave having a frequency .-0; and 805, a emitter-grounded transistor for producing a sine wave which is di~ferent by 180 in phase from the output sine wave of the sine wave generator 804.
Further in FIG. 2, reerence numeral 700 designates . a ba~d-pass filter with a central fre~uency fO; 701, ~ phase comparator in which the phase difference between sine wav~s applied respectively to its input terminals Pl and P2 is provided, as a voltage level, at the output terminal PO;
702, a differentlal amplifier; and 703, a comparator which ou~puts a coincidence pulse when the output of the phase comparator reaches a predetermined level.
~3~L313~:
Each of the Y-axis drivers 31 and 32 is the same Y~axis driver as that shown in FIG. 1 and has a shift ~ register of n stages, so that data applied to the data input terminal D is successively shifted in response to the clock pulse applied to the clock input terminal CK. In the driver, according to data Di (i = 1 through n) in the shift register and a value provided at a switching terminal DF, one of the . voltages applied to.voltage application terminals V], V2, V3 and V4 is provided at an output terminal Oi ~i = 1 through n). The truth table of the.output voltages is as indicated in FIG. 3. Predetermined DC voltages El, E2 and E3 a~e applied to the voltage application terminals Vl, V2 and V3, respectively. A DC vol~age E4 is applied to the terminals V4 ~hrough the input/output mode controller 9 in the display mode, and the two sine wave voltages diiferent by 180 in phase from each other are applied to the terminals V4 in the position detection mode, respectively.
The internal swltches in the input/output mode controller ~ are connected as indicated in FIG. 2 b~ th0 broken lines in the display mode, and ~s indicated by the solid line in the position detection mode.
FIG. 2 shows the Y-axis drivers 31 and 32, and the Y-axis transparent electrodes 121 through 12n. However, it go~s without saying that the X-axis drivers and the X-axis transp~rent electrodes are arranged.perpendicular to the -- 8 .
~ . ' ~3¢~L3~
Y-axis drivers and the Y-axis transparent electrodes, and in the position detection mode they operate in the same ~ manner as the Y-axis drivers and the Y-axis transparent electrodes.
S The operation of the display unit thus organized will be described.
: In the display unit of the invention,, the display mode and the position detection mode occurs alternatively w1th a predetermined period (or in time division mallner).
More specifically, as shown in FIG. 4, one frame period is divi.ded into ~n + 2) periods Tl through Tn~2, and the periods Tl through Tn are used for the display mode,, and the remaining periods Tn~l and Tn~2 for the pOSitiO}l detec-tion mode.
lS In the display mode, the internal switche!3 of the input~output mode controller 9 are connected as ind:Lcated by the hroken lines in FIG. 2, and the liquid crystal dis-play' controller 6 reads the data on a pattern to the dis~
played ~rom the memory 5, so that the display is performed in the voltage averaging drive method well known in the art.
The DC voltages El, E2, E3, and E4 are provided as bias ~. ..
voltages suitable for the voltage averaging driYe method, and the selected voltage is applied to the Y-axis electrode transparent electrodes 121 through 12n respectively for the 2~ periods Tl through Tn in the stated order, and to the X-axis _ g _ -~L 30~ 2 transparent electrode 11 selected for every period. In this operation, the same voltage is outputted.by the dri~ers pro-~ vided on both sides of the X-axis tran,sparent electrodes 11 or the Y-axis transparent electrodes 12.
Now, the position detection mode will be described with reference to FIG. 5. In the period Tn+l, the internal switch~s of the input/output mode controller 9 are connected as indicated by the solid lines, and the y-distance of the position of the input pen 4 is detected.
In the position detection mode, the sine wave voltage ~m sin ~2~fot) generated by the sine wave generator 804, and a sine wave voltage -Vm sin (~2~fot) which is ob-tained by shifting the phase of the sine wave voltage Vm sin (2~ot) by 180 using the transistor 805 are applied to the terminal V4 of the Y-axis driver 31 and the terminal V4 of the Y-axis driver 3~, respectively. As the terminals DF
of the Y-axis drivers 31 and 32 are grounded, th.e outpu~
terminals Oi (i - 1 through n) o the Y-axis driver 31 and 32 pxovide the DC voltage E2 when the data in the shift registers is at "L" ~logical low level), and the.si.ne wave voltage Vm sin (2~fot) and -Vm sin ~2~fot) when at "H' ~logical high level).
A fundamental clock pulse C lFIG..5~ produced by the clock generator 800 is applied to the frequency di-vider 801, where it is subjected to 1/(n+2) frequency ~3C~138;~
division, to provlde a start pulse SP (FIG. 5). The start pulse SP is appLied to the cvunter 802 to reset the content of the counter 802 and to start the latter 802. The start pulse SP is ~urther applied to the data input terminals D
of the shift registers in the Y-axis drivers 31 and 32.
Whenever the fundamental clock pulse C is produced, ~he output val~e of the counter 802 is increased by one ~1", and in synchronization with this, the data in the shift registers of the Y-axis drivers 31 and 32 are shifted by one stage, as a re~sult of which the next Y-axis transparent elect~ode 12 is applied with the voltages ~Vm sin ~2~fot).
In ather words, a sine wave current (~Ra) sin ~2~foy) is applied to the Y-axis transpaxent electrodes 121 through 12n successively.
In this operation, o the AC magnetic flux formed by the sine wave current ~lowing in the transparent elec-trode 12, the camponent which is perpendicular to the surface of the liquid cr~stal cell 1 induces an electromoti~re force in the pickup coil 40 of the input pen 4 which has been placed at the position X on the Y-axis transparent electrode 12m. The electramotive force thus induced is the sine wave which is equal in ~requency to and different in phase by 90 from the sine wave current flowing in the Y-axis transparent electrode and whose level is inversely proportional to the distance between thq point X and the Y-axis transparent ~3~313E~2 electrode 12 in which ~he sine wave current is flowing.
In the case when the current flows in the Y-axis trans-parent electrode 12m having the point X, the distance is the shortest and the component of the magnetic flux which is perpendicular to the surface of the liquld crystal cell is substantially zero, and therefore the output of the pick-up coil 40 is also substantially zero. The output signal of the pickup coil 40 is amplified by the head amplifier 41j and is then applied to the band-pass filter ~00 havin~
~0 the center frequen~y fO to increase the StN ratio. When the current is applied to the Y-axis transparent electrcdes 12 one a~ter another as was described above, the oul:put o~
the band-pass filter 700 i9 as indicated at b in FI( 5.
The sine wave voltages ~m sin (Z~fot)~ which are applied to the terminals V4 of the Y-axis drivers 31 and 32, respecti~ely, are applied to the two input terminal-; of the differential amplifier 702, so that the latter 702 outputs a sine` wave r ~FIG. 5) pxoportional to the current flowing in the Y-axis transparent electrode 12.
As is apparent ~xom FIG. 5, the output signal b of the band-pass filter 700 provided for the period of time in which the current flows in the ~-axis transparent elec-trodes 121 through 12 successively is different in phase by 180 from that of the band-pass filter provided from the period of time in which the current flows in the Y-axis ~L301~
~ransparent electrodes 12(m~l1 through 12n. Therefore, when the output signal r of the differential amplifier 702 ~ and the output signal b of the band-pass ~ilter 700 are ap-plied to the phase comparator 701, the latter 701 provides an output signal p as indicated ~t ~ in FIG. 5. ~hen the level of the output signal ~ of the phase comparator 701 reaches a value VR which is the potenti~l provided at the reference potential terminal B of the comparator 703, the latter 703 provides the coincidence pulse Q, and the latch 10 circuit 803 latches the output of the counter 802 at that.
...... .
time.
In other words, when the m-th Y-axis transparent electrode 12m, on which the input pen 4 is position~d, is scanned with the AC current, the comparator 703 outputs the coincidence pulse~ and the latch circuit latches the out-put value m of the counter 802. The CPU 10 reads the out-put value of the latch 803, to detect the y-distance of the position of the input pen 4.
The above-described operations are carrie~1 out in the period Tn~l in FIG. 4. In the following perio~ Tn+2, the same operations are performed with respect to X-axis drivers 21 and 22 and the X-axis transparent electrodes ll, to detect the x-distance of the input pen 4.
. . .
. .
.
.; ~; ' 3~æ
As is apparent from the abo~e-description, the image displaying function and the position detecting ~ function have been combined together according to the inven-tion. That is, the display unit having the da'ca inputting function has been provided merely by adding the simple circuit instead of an intricate device to the display devic~.
In the above-described embodiment of the invention~
the liquid cxystal panel is employed. However, the techni-cal concept of the invention is applicable, with the same effects, to a plasma display panel, an electroluminescence display panel, or an electronic chromic display panel.
Furthexmore,. the current flowing in the transparent elec-.
trodes may be of A triangular wave or saw tooth wave.
As was described above, the display unit c)f the invention is so designed that the AC current is app].ied to the electrodes of the planar display device which are arranged in matrix form, and the position detection is carried out according to the variation in phase of t:he output signal of the input pen which detects the maqnetic flux formed by the current flowing in the electrodes.
Therefore, the display unit according to the invention can be manufactured at relatively low cost, and can stably detect and output coordinates with high positional accuracy with respect to display picture elements.
- ~4 -
~3~3~3;2 DISPLAY UNIT
BP~CKGROUND OF THE INVEWTION
..... _ ,, , _ _ This invention relates to a display unit for an electronic computer, and more particularly to a display unit serving as interactive means between an electronic computer and the operator, whose planar display panel can be used as a coordinate input surface.
A display unit with a data inputting function whose planar display panel can be used to input coordina~es has been disclosed by Japanese Patent Application Lai~-Opqn No. 31127/81. The conventional data input type dis~
. p~ay unit is as shown in FIG. 6.
In FIG. 6, reference numeral 400 designat:es aliquid crystal panel; 500, a transparent touch panel switch, and 600, a controller. FIG. 7 is a sectional view of the transparent touch panel switch 500. In FIG. 7, refere.nce ~umeral 501 designates an upper transparent film substrate;
502, belt~shaped X-axis transparent electrodes laid on the upper transparent film substrate 501 in such a manner that ~hey are in parallel with one another; 503, a lower trans-parent film substrate; 504 t belt-shaped Y-axis transpar~nt electrodes laid on the lower transparent film subs~rate 503 in such a manner that they are in parallel with one another and perpendicular to the X-axis transparent electrodes .
13~
502;,and 505, a spacer in the form of a transparent sheet having holes at the intersections of the X-axis transparent electrodes 502 and the Y-axis transparent electrodes 5~4O
The operation of the display unit thus constructed will be described. An operation of displaying imases on the liquid crystal panel 400 is carrled out in the conv~n-tional'manner. The transparent touch panel switch 500 operates as follows: When the operator tauches the sur~ace of the transparent touch panel switch 500 with his finger or a writing pen, ths X-axis transparent electrode 502 and the Y-axis transparent electrode.504 are brought into con-t~ct with each other through the hole of the spacer 505 at , the part of the surface of the panel switch 500 which has been touched by the operator. Under this condition, the ,: 15 controller 600 sc,ans all the X-axis transparent electrodes .~ 502 and all the Y-axis transparent electrodes 504 o~ th~
transparent touch panel switch 500 to detect conduction or nonconduct~n. at the intersections of the X-axis and Y-axis transparent electrod s 502 and 504, thereby to detect the position'on the surface of the l~quid crystal panel 4~0 which has been indicatqd with the finger or writing pen.
The conventio~al display unit described aboYe suffers from the following difficulties: The display unit , is so designed that the image displayed on the liquid crystal panel is observed through ~he transparent touch panel, and .
.
, - : :
;
~L3~382 therefore the display quality is lowered as much. This difficulty may be overcome by increasing the resolution of the transparent touch panel switch substantially to that of picture elements displayed. However, employment of the method results in increasing the manufacturing cost of the display unit, and gives rise to another problem that the transparent touch panel switch and the liquid crystal panel must be accurately aligned with each other in display dot position.
. SUMMARY QF q:HE IMV.E~ITION
Accordingly, an object of this invention is to eliminate the above-described difficulties accompanying a conventional display unit with a data inputting function.
More specifically, an object of the invention is to provide a display unit having a data inputting function which is high ln display quality, low in manufacturing cost and high in position detection accuracy.
The foregoing object and other objects of the invention have been achieved by the provision of a display unit which, according to the invention, comprises; a flat-plate-shaped display panel having X-Y matrix electrodes con-sisting of two groups of electrodes which are arranged in matrlx form; displaying~signal applying means for applying displaying signals to the X-Y matrix electrodes; current applying means for applying a current having a.c. components : '~ ':'' ' ' ':
~3~
~o at least one group of electrodes in such a manner that the current flows in the electrodes one after another; an input pen with magnetic flux detecting means; phase compari-son means for comparing the phase of the current applied to the electrodes with that of the output signal of the magnetic flux detecting means; and position detecting means for detecting the position of the input pen on the display panel according to the output signal of the phase comparison means.
A display unit according to the present :invention can function in a display mode an~ a position detecting mode in accordance with the kind of the signal app:ied to the matrix electrodes. When an à.c. current is applied to the matrix electrodes successively in the position detecting mode, the phases of the signals outputted from the ma~netic flux detecting means included in the pen ~re different in phase between a case in which the current is applied to one group of the electrodes and a case in which the current is applied to the ~ther group of the electrodes with the posi-tlon of the pen having the magnetic flux detecting mean~ asa boundary. Accordingly, the position of the magnetic ~lux detecting means can be detected by detecting the point of ~he phase change.
The nature, principle and utility of the invention will become more apparent from the following detailed 13~138~
description when read in conjunction with the accompanying drawings, in which like parts are designated by like refer-- ence numerals or characters.
BRIEF DESCRIPTION OF THE l)RAWINGS
In the accompanying drawings:
FIG. 1 is an explanatory diagrams, partly as a blOck diagram, showing the arrangement o~ one example of a di.~play unit according to this invention;
. FIG. 2 is an explanatory diagram, partly as a block diagram, for a description of the position detecting ~:. operation of the display unit according to the invention;
FIG. 3 is. a diagram showing the truth table of Y-axis drivers~in FIG. 2;
FIG. 4 is a diagra~ for a description o~ the time division for a di~play mode and a position detection mode ~: in the display unit of the in~rention;
~IG. 5 is a time chart showing essentlal output signals in the circuit of FIG. 2;
FIG. 6 is an external view of a conventional dis 20 play unit having a data inputting ~unction; and FIG. 7 is a sectional view of a transparent touch panel switch in the conventional display unit vf FIG. 7.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A display unit according t~ this invention, as - ; 25 shown in FIG. l, comprises: a TN mode display liquLd crystal ..
~ ~ 5 - .
, ;
~3~:)138;~
cell 1 ~plahax display panel~ made up of belt-shaped X-axis transparent electrodes 11 and belt-shaped ~-axis transparent electrodes 12 which are arranged perpendicular to each othe~
and the driven through their ends by signals; X-axis drivers S 21 and 22; Y-axis drivers ~1 and 32; an input pen 4 made up of a pickup coil wound on a ferrite core, and a head amplï~
fier 41, a memory 5 for storing a pattern ~o be displayed on the li~uid crystal cel]. l; and a liquid crystal dis~lay. con-troller 6 for reading out of the memory 5 pattern dcnta in.
the X-axis direction which correspond to the Y-axis trans-parent electrodes 12 selected, and.transferring thenl to the X-axis drivers 21 and 22.
The display further comprises; a position detect-ing circuit 7 which outputs a detection signal in`response lS to the output signal of the inputting pen 4;`a posit.ion de-tection scanning circuit 8; and an input/output mode con-troller 9 operating as switching means for applying display data and cohtrol signals provided by the liquid crystal controller 6 to the X-axis drivers 21 and 22 and the Y-axis drivers 31 and 32 in a display mode, and applying signals provided by the position detection scanning circuit 8 to the : X-axis drivers 21 and 22 and the Y-axis drivers 31 and 32 in a position detection mode. In FIG. 1, reference numeral 10 designates a CPU (central processing unit) ~or control-ling the operation of the display unit, for instance writingdisplay patterns in the memory 5.
~L3~31382 FIG. 2 shows the arrangement of the display unit in the position detection mode in more detail. In FIG. 2, ~ reference numeral aoo designates a clock generator whose output terminal is connected to the clock input terminals CK of the Y-axis drivers 31 and 32 through the input/output mode controller 9, and to the input terminal of a frequency dividex 801 and to the clock input terminal CK of a counter 802. The output terminal of the frequency divider ~301 i5 connected to the data input terminals D of the Y-ax:is driv-ers 31 and 32, and to the start terminal S of the counter802. Further in FIG. 2, reference-numeral 803 desiqnates a latch circuit for latching the output of the counl:er 802 with the aid of a latch pulse ~Q); 804, a sine wave gener-ator for generating a sine wave having a frequency .-0; and 805, a emitter-grounded transistor for producing a sine wave which is di~ferent by 180 in phase from the output sine wave of the sine wave generator 804.
Further in FIG. 2, reerence numeral 700 designates . a ba~d-pass filter with a central fre~uency fO; 701, ~ phase comparator in which the phase difference between sine wav~s applied respectively to its input terminals Pl and P2 is provided, as a voltage level, at the output terminal PO;
702, a differentlal amplifier; and 703, a comparator which ou~puts a coincidence pulse when the output of the phase comparator reaches a predetermined level.
~3~L313~:
Each of the Y-axis drivers 31 and 32 is the same Y~axis driver as that shown in FIG. 1 and has a shift ~ register of n stages, so that data applied to the data input terminal D is successively shifted in response to the clock pulse applied to the clock input terminal CK. In the driver, according to data Di (i = 1 through n) in the shift register and a value provided at a switching terminal DF, one of the . voltages applied to.voltage application terminals V], V2, V3 and V4 is provided at an output terminal Oi ~i = 1 through n). The truth table of the.output voltages is as indicated in FIG. 3. Predetermined DC voltages El, E2 and E3 a~e applied to the voltage application terminals Vl, V2 and V3, respectively. A DC vol~age E4 is applied to the terminals V4 ~hrough the input/output mode controller 9 in the display mode, and the two sine wave voltages diiferent by 180 in phase from each other are applied to the terminals V4 in the position detection mode, respectively.
The internal swltches in the input/output mode controller ~ are connected as indicated in FIG. 2 b~ th0 broken lines in the display mode, and ~s indicated by the solid line in the position detection mode.
FIG. 2 shows the Y-axis drivers 31 and 32, and the Y-axis transparent electrodes 121 through 12n. However, it go~s without saying that the X-axis drivers and the X-axis transp~rent electrodes are arranged.perpendicular to the -- 8 .
~ . ' ~3¢~L3~
Y-axis drivers and the Y-axis transparent electrodes, and in the position detection mode they operate in the same ~ manner as the Y-axis drivers and the Y-axis transparent electrodes.
S The operation of the display unit thus organized will be described.
: In the display unit of the invention,, the display mode and the position detection mode occurs alternatively w1th a predetermined period (or in time division mallner).
More specifically, as shown in FIG. 4, one frame period is divi.ded into ~n + 2) periods Tl through Tn~2, and the periods Tl through Tn are used for the display mode,, and the remaining periods Tn~l and Tn~2 for the pOSitiO}l detec-tion mode.
lS In the display mode, the internal switche!3 of the input~output mode controller 9 are connected as ind:Lcated by the hroken lines in FIG. 2, and the liquid crystal dis-play' controller 6 reads the data on a pattern to the dis~
played ~rom the memory 5, so that the display is performed in the voltage averaging drive method well known in the art.
The DC voltages El, E2, E3, and E4 are provided as bias ~. ..
voltages suitable for the voltage averaging driYe method, and the selected voltage is applied to the Y-axis electrode transparent electrodes 121 through 12n respectively for the 2~ periods Tl through Tn in the stated order, and to the X-axis _ g _ -~L 30~ 2 transparent electrode 11 selected for every period. In this operation, the same voltage is outputted.by the dri~ers pro-~ vided on both sides of the X-axis tran,sparent electrodes 11 or the Y-axis transparent electrodes 12.
Now, the position detection mode will be described with reference to FIG. 5. In the period Tn+l, the internal switch~s of the input/output mode controller 9 are connected as indicated by the solid lines, and the y-distance of the position of the input pen 4 is detected.
In the position detection mode, the sine wave voltage ~m sin ~2~fot) generated by the sine wave generator 804, and a sine wave voltage -Vm sin (~2~fot) which is ob-tained by shifting the phase of the sine wave voltage Vm sin (2~ot) by 180 using the transistor 805 are applied to the terminal V4 of the Y-axis driver 31 and the terminal V4 of the Y-axis driver 3~, respectively. As the terminals DF
of the Y-axis drivers 31 and 32 are grounded, th.e outpu~
terminals Oi (i - 1 through n) o the Y-axis driver 31 and 32 pxovide the DC voltage E2 when the data in the shift registers is at "L" ~logical low level), and the.si.ne wave voltage Vm sin (2~fot) and -Vm sin ~2~fot) when at "H' ~logical high level).
A fundamental clock pulse C lFIG..5~ produced by the clock generator 800 is applied to the frequency di-vider 801, where it is subjected to 1/(n+2) frequency ~3C~138;~
division, to provlde a start pulse SP (FIG. 5). The start pulse SP is appLied to the cvunter 802 to reset the content of the counter 802 and to start the latter 802. The start pulse SP is ~urther applied to the data input terminals D
of the shift registers in the Y-axis drivers 31 and 32.
Whenever the fundamental clock pulse C is produced, ~he output val~e of the counter 802 is increased by one ~1", and in synchronization with this, the data in the shift registers of the Y-axis drivers 31 and 32 are shifted by one stage, as a re~sult of which the next Y-axis transparent elect~ode 12 is applied with the voltages ~Vm sin ~2~fot).
In ather words, a sine wave current (~Ra) sin ~2~foy) is applied to the Y-axis transpaxent electrodes 121 through 12n successively.
In this operation, o the AC magnetic flux formed by the sine wave current ~lowing in the transparent elec-trode 12, the camponent which is perpendicular to the surface of the liquid cr~stal cell 1 induces an electromoti~re force in the pickup coil 40 of the input pen 4 which has been placed at the position X on the Y-axis transparent electrode 12m. The electramotive force thus induced is the sine wave which is equal in ~requency to and different in phase by 90 from the sine wave current flowing in the Y-axis transparent electrode and whose level is inversely proportional to the distance between thq point X and the Y-axis transparent ~3~313E~2 electrode 12 in which ~he sine wave current is flowing.
In the case when the current flows in the Y-axis trans-parent electrode 12m having the point X, the distance is the shortest and the component of the magnetic flux which is perpendicular to the surface of the liquld crystal cell is substantially zero, and therefore the output of the pick-up coil 40 is also substantially zero. The output signal of the pickup coil 40 is amplified by the head amplifier 41j and is then applied to the band-pass filter ~00 havin~
~0 the center frequen~y fO to increase the StN ratio. When the current is applied to the Y-axis transparent electrcdes 12 one a~ter another as was described above, the oul:put o~
the band-pass filter 700 i9 as indicated at b in FI( 5.
The sine wave voltages ~m sin (Z~fot)~ which are applied to the terminals V4 of the Y-axis drivers 31 and 32, respecti~ely, are applied to the two input terminal-; of the differential amplifier 702, so that the latter 702 outputs a sine` wave r ~FIG. 5) pxoportional to the current flowing in the Y-axis transparent electrode 12.
As is apparent ~xom FIG. 5, the output signal b of the band-pass filter 700 provided for the period of time in which the current flows in the ~-axis transparent elec-trodes 121 through 12 successively is different in phase by 180 from that of the band-pass filter provided from the period of time in which the current flows in the Y-axis ~L301~
~ransparent electrodes 12(m~l1 through 12n. Therefore, when the output signal r of the differential amplifier 702 ~ and the output signal b of the band-pass ~ilter 700 are ap-plied to the phase comparator 701, the latter 701 provides an output signal p as indicated ~t ~ in FIG. 5. ~hen the level of the output signal ~ of the phase comparator 701 reaches a value VR which is the potenti~l provided at the reference potential terminal B of the comparator 703, the latter 703 provides the coincidence pulse Q, and the latch 10 circuit 803 latches the output of the counter 802 at that.
...... .
time.
In other words, when the m-th Y-axis transparent electrode 12m, on which the input pen 4 is position~d, is scanned with the AC current, the comparator 703 outputs the coincidence pulse~ and the latch circuit latches the out-put value m of the counter 802. The CPU 10 reads the out-put value of the latch 803, to detect the y-distance of the position of the input pen 4.
The above-described operations are carrie~1 out in the period Tn~l in FIG. 4. In the following perio~ Tn+2, the same operations are performed with respect to X-axis drivers 21 and 22 and the X-axis transparent electrodes ll, to detect the x-distance of the input pen 4.
. . .
. .
.
.; ~; ' 3~æ
As is apparent from the abo~e-description, the image displaying function and the position detecting ~ function have been combined together according to the inven-tion. That is, the display unit having the da'ca inputting function has been provided merely by adding the simple circuit instead of an intricate device to the display devic~.
In the above-described embodiment of the invention~
the liquid cxystal panel is employed. However, the techni-cal concept of the invention is applicable, with the same effects, to a plasma display panel, an electroluminescence display panel, or an electronic chromic display panel.
Furthexmore,. the current flowing in the transparent elec-.
trodes may be of A triangular wave or saw tooth wave.
As was described above, the display unit c)f the invention is so designed that the AC current is app].ied to the electrodes of the planar display device which are arranged in matrix form, and the position detection is carried out according to the variation in phase of t:he output signal of the input pen which detects the maqnetic flux formed by the current flowing in the electrodes.
Therefore, the display unit according to the invention can be manufactured at relatively low cost, and can stably detect and output coordinates with high positional accuracy with respect to display picture elements.
- ~4 -
Claims (2)
1. A display unit comprising:
a flat-plate-shaped display panel having X-Y
matrix electrodes consisting of two groups of electrodes which are arranged in matrix form;
display-signal applying means for applying dis-playing signals to said X-Y matrix electrodes;
current applying means for applying a current having a.c. components to at least one group of electrodes in such a manner that said current flows in said electrodes one after another;
an input pen with magnetic flux detecting means;
phase comparison means for comparing the phase of said current applied to said electrodes with that of an output signal of said magnetic flux detecting means; and position detecting means for detecting the posi-tion of said input pen on said display panel according to an output signal of said phase comparison means.
a flat-plate-shaped display panel having X-Y
matrix electrodes consisting of two groups of electrodes which are arranged in matrix form;
display-signal applying means for applying dis-playing signals to said X-Y matrix electrodes;
current applying means for applying a current having a.c. components to at least one group of electrodes in such a manner that said current flows in said electrodes one after another;
an input pen with magnetic flux detecting means;
phase comparison means for comparing the phase of said current applied to said electrodes with that of an output signal of said magnetic flux detecting means; and position detecting means for detecting the posi-tion of said input pen on said display panel according to an output signal of said phase comparison means.
2. A display unit as claimed in claim 1, in which drivers are connected to said electrodes of each group at both ends, and said current applying means causes said drivers to output the same voltages in a display mode, and causes said drivers at both ends of a selected one of said electrodes to output sine wave voltages different by 180°
in phase from each other in a position detection mode.
in phase from each other in a position detection mode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP226767/86 | 1986-09-25 | ||
| JP61226767A JPH0738152B2 (en) | 1986-09-25 | 1986-09-25 | Display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1301382C true CA1301382C (en) | 1992-05-19 |
Family
ID=16850295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000544903A Expired - Lifetime CA1301382C (en) | 1986-09-25 | 1987-08-19 | Display unit |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4841290A (en) |
| JP (1) | JPH0738152B2 (en) |
| CA (1) | CA1301382C (en) |
| DE (1) | DE3726208A1 (en) |
Families Citing this family (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5194852A (en) * | 1986-12-01 | 1993-03-16 | More Edward S | Electro-optic slate for direct entry and display and/or storage of hand-entered textual and graphic information |
| US4839634A (en) * | 1986-12-01 | 1989-06-13 | More Edward S | Electro-optic slate for input/output of hand-entered textual and graphic information |
| US4990900A (en) * | 1987-10-01 | 1991-02-05 | Alps Electric Co., Ltd. | Touch panel |
| US5528267A (en) * | 1988-12-19 | 1996-06-18 | Sharp Kabushiki Kaisha | Tablet integrated with display |
| US5283556A (en) * | 1988-12-19 | 1994-02-01 | Sharp Kabushiki Kaisha | Tablet integrated with display |
| US5194863A (en) * | 1989-04-10 | 1993-03-16 | International Business Machines Corporation | Touch panel display |
| JPH02278326A (en) * | 1989-04-19 | 1990-11-14 | Sharp Corp | Information input/output device |
| JPH0383120A (en) * | 1989-08-28 | 1991-04-09 | Mitsubishi Electric Corp | Display device with coordinate input function |
| US5465103A (en) * | 1989-08-28 | 1995-11-07 | Mitsubishi Denki Kabushiki Kaisha | Display device with coordinate input function |
| JPH0666048B2 (en) * | 1989-10-06 | 1994-08-24 | 富士ゼロックス株式会社 | Operation procedure batch registration device |
| US5120908A (en) * | 1990-11-01 | 1992-06-09 | Gazelle Graphic Systems Inc. | Electromagnetic position transducer |
| JP2534422B2 (en) * | 1991-03-12 | 1996-09-18 | シャープ株式会社 | Display integrated tablet device |
| US5101081A (en) * | 1991-03-25 | 1992-03-31 | Wang Laboratories, Inc. | Graphics surface assembly with calibrating memory device |
| US5392058A (en) * | 1991-05-15 | 1995-02-21 | Sharp Kabushiki Kaisha | Display-integrated type tablet device |
| EP0513792B1 (en) * | 1991-05-15 | 2003-08-20 | Sharp Kabushiki Kaisha | Display-integrated type tablet device |
| JP2975467B2 (en) * | 1991-11-28 | 1999-11-10 | シャープ株式会社 | Display integrated position reader |
| JPH05233147A (en) * | 1992-02-21 | 1993-09-10 | Mitsubishi Electric Corp | Display incorporating type tablet |
| US5534892A (en) * | 1992-05-20 | 1996-07-09 | Sharp Kabushiki Kaisha | Display-integrated type tablet device having and idle time in one display image frame to detect coordinates and having different electrode densities |
| EP0843278B1 (en) * | 1992-05-22 | 2002-10-23 | Sharp Kabushiki Kaisha | Display-integrated type tablet device |
| JP2795776B2 (en) * | 1992-05-22 | 1998-09-10 | シャープ株式会社 | Display integrated tablet device |
| KR950004378B1 (en) * | 1992-09-09 | 1995-04-28 | 주식회사금성사 | Lcd cell and manufacturing method of situation sensing |
| US6133906A (en) * | 1993-03-15 | 2000-10-17 | Microtouch Systems, Inc. | Display-integrated stylus detection system |
| US5491706A (en) * | 1993-04-07 | 1996-02-13 | Sharp Kabushiki Kaisha | Display-integrated type tablet device capable of detecting correct coordinates at a tip end of a detection pen by detecting external noise |
| US5389951A (en) * | 1993-07-21 | 1995-02-14 | International Business Machines Corp. | Liquid crystal display integrated with hall effect pointing device |
| JP2653014B2 (en) * | 1993-07-26 | 1997-09-10 | 日本電気株式会社 | Active matrix liquid crystal display device |
| JP3368627B2 (en) * | 1993-08-31 | 2003-01-20 | 双葉電子工業株式会社 | Display integrated tablet |
| US5897648A (en) * | 1994-06-27 | 1999-04-27 | Numonics Corporation | Apparatus and method for editing electronic documents |
| US5737740A (en) * | 1994-06-27 | 1998-04-07 | Numonics | Apparatus and method for processing electronic documents |
| KR100626063B1 (en) * | 2005-03-18 | 2006-09-22 | 삼성에스디아이 주식회사 | Plasma display apparatus of touch screen type |
| US8144115B2 (en) | 2006-03-17 | 2012-03-27 | Konicek Jeffrey C | Flat panel display screen operable for touch position determination system and methods |
| US7859526B2 (en) * | 2006-05-01 | 2010-12-28 | Konicek Jeffrey C | Active matrix emissive display and optical scanner system, methods and applications |
| US8040326B2 (en) | 2007-06-13 | 2011-10-18 | Apple Inc. | Integrated in-plane switching display and touch sensor |
| EP2696265A4 (en) * | 2011-04-07 | 2014-08-27 | Sharp Kk | Electronic apparatus, and method for controlling electronic apparatus |
| EP2757444B1 (en) * | 2011-09-13 | 2017-04-19 | Slim HMI Technology | Visual interface system |
| WO2013174186A1 (en) * | 2012-05-25 | 2013-11-28 | Tsai Hsiung-Kuang | Non-display signal coding method and matrix substrate |
| CN208126362U (en) * | 2017-12-29 | 2018-11-20 | 昆山国显光电有限公司 | A kind of touch-control display panel and its device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3466391A (en) * | 1966-09-07 | 1969-09-09 | Marconi Co Ltd | Electrical position resolver employing capacitive probe coupled to resistive layer containing two pairs of conductive strips energized by four different frequency signals |
| US3674928A (en) * | 1969-03-14 | 1972-07-04 | Matsushita Electric Ind Co Ltd | Scanning apparatus for electroluminescent crossed-grid panel |
| US4117471A (en) * | 1976-08-18 | 1978-09-26 | International Business Machines Corporation | Light pen detection and tracking with ac plasma display panel |
| JPS5443619A (en) * | 1977-09-13 | 1979-04-06 | Nippon Telegr & Teleph Corp <Ntt> | Character input device |
| DE2850930A1 (en) * | 1978-11-24 | 1980-06-19 | Siemens Ag | Light detector with sensitivity max. at helium-neon laser wavelength - has cadmium indium sulphide spinel body and metal-semiconductor junction |
| JPS5924473B2 (en) * | 1981-03-24 | 1984-06-09 | 富士通株式会社 | Coordinate input device with display function |
| JPS57161044U (en) * | 1981-03-31 | 1982-10-09 | ||
| JPS5921077B2 (en) * | 1981-12-28 | 1984-05-17 | 富士通株式会社 | coordinate reading device |
| JPS6177920A (en) * | 1984-09-22 | 1986-04-21 | Sharp Corp | Device for input and liquid crystal display |
-
1986
- 1986-09-25 JP JP61226767A patent/JPH0738152B2/en not_active Expired - Lifetime
-
1987
- 1987-08-06 DE DE19873726208 patent/DE3726208A1/en active Granted
- 1987-08-19 CA CA000544903A patent/CA1301382C/en not_active Expired - Lifetime
- 1987-09-25 US US07/101,032 patent/US4841290A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6381521A (en) | 1988-04-12 |
| JPH0738152B2 (en) | 1995-04-26 |
| DE3726208C2 (en) | 1989-07-20 |
| DE3726208A1 (en) | 1988-04-07 |
| US4841290A (en) | 1989-06-20 |
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