CN101685608B - Display system and driving method thereof - Google Patents
Display system and driving method thereof Download PDFInfo
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- CN101685608B CN101685608B CN2008101988304A CN200810198830A CN101685608B CN 101685608 B CN101685608 B CN 101685608B CN 2008101988304 A CN2008101988304 A CN 2008101988304A CN 200810198830 A CN200810198830 A CN 200810198830A CN 101685608 B CN101685608 B CN 101685608B
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Abstract
The invention discloses a liquid crystal display system capable of outputting low luminance and a driving method thereof. In particular the liquid crystal display system can descend the color gradation of red signals in a display picture. The liquid crystal display system comprises a liquid crystal display and an image processing device. The image processing device at least outputs the red signals to the liquid crystal to display the image. The color gradation of red signals is descended by using a control chip or a switch device, so that the liquid crystal display is suitable for watching by a user under a special condition.
Description
Technical field
The present invention provides a kind of liquid crystal display systems and driving method thereof, the particularly a kind of liquid crystal display systems and driving method thereof that can downgrade red signals color range output in the display frame.
Background technology
In the ordinary course of things, the user can directly read the display message on the LCD; And under some special situation, for example military, security monitoring, hunting, night ecological observation etc., the brightness of LCD must downgrade in order to avoid influence context, but the brightness after downgrading but make general user can't direct reading it.Be must wear the information that night-vision devices are observed LCD with the user, for example figure, literal, image etc.No matter yet general night-vision devices are to use the second generation or third generation image intensifier tube (image intensifier), its in visible light ruddiness district and the gain in infrared light district much larger than other wave band, as shown in Figure 1.Even if so with the briliancy Wehnelt electrode low value of LCD; The night-vision devices that general non-specialized designs is used for watching LCD in the use; Still go up supersaturation because of night-vision devices mutually with the excessive amplification of light signal and apparent easily, even cause the damage of night-vision devices assembly and the discomfort impression of night-vision devices user vision overirritation.
Perhaps also can adopt the mode that downgrades the liquid crystal display-driving electric current to reduce the integral brightness of LCD; But the very few design of LCD is at present used with ultralow briliancy; Even if the light emitting diode of the low drive current of LCD utilization is as backlight; Still the minimum drive current restriction is arranged because of the light emitting diode lowest drive current makes LCD; And if the liquid crystal display-driving electric current is lower than this minimum drive current, then can produces the situation of flicker (flicker), and cause the instability of liquid crystal display displays picture; In sum; Because the minimum briliancy of LCD promptly is activated circuit or assembly is limit, so the convention LCD is difficult to see through the mode that reduces the liquid crystal display-driving electric current and make the minimum briliancy of LCD meet the visual experience permissible range of watching through night-vision devices.
On known techniques; When the minimum briliancy of LCD can't meet the permissible range of night-vision devices and human visual impression; The optical filter that the night-vision devices user will filter ruddiness mostly is positioned on the LCD, uses order meets night-vision devices and human visual impression through the light of said optical filter permissible range.Yet the method has following three kinds of shortcomings: 1. if LCD has touch controllable function, owing to optical filter is positioned on the LCD, and cause the operator to be difficult to LCD is carried out touch control operation.2. the operator need carry this optical filter, and properly preserves.3. with the ask a price market price of 1,000 U.S. dollars of 12.1 o'clock now optical filters, the optical lightscreening sector-meeting causes on the user cost burden greatly.
Summary of the invention
The present invention disclosed a kind of liquid crystal display systems that can export low briliancy with and driving method, especially downgrade the color range of red signals; Liquid crystal display systems has comprised LCD and an image processor, and image processor exports red, blue, green signal to LCD with show image.
Image processor downgrades the mode of red signals color range, is gamma (Gamma) value of utilizing control chip to control the red signals color range; Wherein can utilize software directly to adjust the output Gamma of display chip, or on the signal transmission channel behind the display chip, carry the color management chip that to do red, blue, green rank output Gamma adjustment respectively.No matter be any chip more than the employing, all can adjusting with Gamma of red signals be downgraded, be beneficial to watch under special circumstances the demonstration of this display system.For example, when the user utilizes night-vision devices, make night-vision devices not have supersaturation, even can be directly the Gamma of red signals be adjusted into 0.
Image processor downgrades the mode of red signals color range; Also can between output of the red signals of signal transmission channel and display, install a switchgear additional, when the user utilizes night-vision devices to watch display, just can take respective operations (for example voluntarily; Press certain triggering key and produce a trigger signals; Again by the mode of trigger signals activation (enable) hardware or software, and this red channel is closed, and output red signal not.
By following detailed explanation, the appended legend of arranging in pairs or groups, the invention described above characteristic, advantage and target will be more clear.
Description of drawings
Fig. 1 is the gain relationship figure to different wave length of night-vision devices.
Fig. 2 is the circuit diagram according to the display system of first embodiment of the invention.
Fig. 3 is the circuit diagram according to the display system of second embodiment of the invention.
Fig. 4 is the circuit diagram according to the display system of third embodiment of the invention.
Fig. 5 shows the corresponding curve relation figure that carries out the Gamma conversion for redness input data.
Fig. 6 shows the flow chart of steps according to the present invention's display-apparatus driving method.
Embodiment
Fig. 2 is the circuit box synoptic diagram according to the computer system of first embodiment of the invention.The computer system 500 of present embodiment exposure comprises a display system 2, one main circuit devices 60 at least, and a special pattern starter gear 62.This display system 2 is to be example with the liquid crystal display systems, but is not to be defined in this.This liquid crystal display systems 2 more comprises a LCD 26, in order to show image; And an image processor 20 in order to export blue B, green G, red R (28) signal, supplies this LCD 26 to show.This image processor 20 comprises a display chip 22, and a signal transmission channel 24.This display chip 20 receives image input (not icon) basically, carry out the processing of image demonstration after, export to signal transmission channel 24.This display chip 22 has gamma (Gamma) processing capacity, can red, blue, green input data (not icon) in this image input be converted into red, blue, green output data (r, b, g) according to the corresponding relation of specific curves.
This main circuit device 60; Be responsible for the main running of this computer system 500; The for example computing of operating system, (image) signal of will video picture handling is transferred to image processor (20) and is handled, and exports red R, green G, blue B signal to LCD (26) with video picture.
With reference to Fig. 5, be example with the redness, show the corresponding curve relation figure that carries out the Gamma conversion for redness input data.For example; This display chip 22 receives between redness of 0～255 digital color range (or briliancy) and imports data (in this so-called color range; The depth program that also is about to redness is subdivided into 0～255 respective value (level)); According to the corresponding relation of Fig. 5 curve a, input levels is similar to one to one with the corresponding relation of output levels.In like manner, blue, green input data (b, g) also can be carried out the conversion of correspondence according to other Gamma curve (not icon).Therefore, this image processor 20, an available software 222 are directly controlled the Gamma conversion in the display chip 22, and the color range of adjustable magenta color output data.For example, can the color range of red output data be downgraded zero, or shown in Fig. 5 curve b, downgrade the color range of red output data with a preset ratio.Wherein, this software 222 for example is the driver of this display chip 22.
Blue, green output data and the red output data that downgrades the back through signal transmission channel 24, and become blue B, green G, red R (28) signal, supply this LCD 26 to show.Because red output data is through downgrading, the color range (or briliancy) of red R (28) signal also downgrades thereupon, so the red composition of 26 show images of this LCD reduces, watches under special circumstances so be fit to the user.For example; The user is when wearing night-vision devices and observe the display message of LCD; Just can take respective operations (for example, to open a special pattern, voluntarily again by the mode of trigger signals activation (enable) hardware or software to produce a trigger signals; And then downgrade red composition, so can not make night-vision devices produce the briliancy of supersaturation.
The operation that aforementioned user can take voluntarily; Can and reach through this special pattern starter gear 62; For example when using night-vision devices to watch the demand of LCD (26～46) institute video data; The user can open this special pattern starter gear 62 in advance and (for example see through and push a predetermined key ... Etc. mode); And produce this trigger signals, carry out operation respectively to make image processor (20～30), to meet the visual experience permissible range of watching through night-vision devices like aforementioned reduction red signals R.
The signal transmission channel 24 of present embodiment; For example comprise transistor-transistor-logic (transistor-transistor-logic; TTL) or the low voltage differential signal (low voltage differential signaling, LVDS) device, carry out the conversion of necessity in order to red, blue, the green output data that display chip is seen off; And produce this red, blue, green signal (R, B, G), and export this LCD 26 to.In addition, Gamma transformation curve a, b shown in Figure 5 are straight line, are merely the usefulness of illustration, but are not to be defined in this, and the transformation curve shape of reality is looked closely practical application and decided.In addition, this main circuit device 60 and special pattern starter gear 62 also can be arranged in this display system 2.
Fig. 3 is the circuit box synoptic diagram according to the computer system of second embodiment of the invention.The computer system 600 of present embodiment exposure comprises a display system 3, one main circuit devices 60 at least, and a special pattern starter gear 62.This display system 3 is to be example with the liquid crystal display systems, but is not to be defined in this.Liquid crystal display systems 3 comprises a LCD 36; And an image processor 30 in order to export blue B, green G, red R (28) signal, supplies this LCD 36 to show.This image processor 30 comprises a display chip 32, and a signal transmission channel 34.This display chip 30 receives image input (not icon) basically, and after the processing of carrying out the image demonstration, output has, and output data red, blue, green (r, b, g) one-tenth branch is given signal transmission channel 34.
This main circuit device 60; Be responsible for the main running of this computer system 600; The for example computing of operating system, (image) signal of will video picture handling is transferred to image processor (30) and is handled, and exports red R, green G, blue B signal to LCD (36) with video picture.
The signal transmission channel 34 of present embodiment; For example comprise transistor-transistor-logic (TTL) or low voltage differential signal (LVDS) device; Data (r, b, g) in order to display chip 32 is seen off are carried out the conversion of necessity; And produce this red R (28), blue B, green G signal, and export this LCD 36 to.Be noted that, more carry a color management chip 343 that can carry out Gamma adjustment in the signal transmission channel 34, produce this red R (28), blue B, green G signal with the above-mentioned TTL that arranges in pairs or groups, LVDS running to data (r, b, g).The Gamma adjustment that 343 of this color management chips carry out, identical like the said person of first embodiment, so no longer give unnecessary details.
This image display 30 utilizes this color management chip 343 further to downgrade 32 data r that see off of this display chip, and then downgrades the color range of red signals R (28).So the red composition of 36 show images of this LCD reduces, watch under special circumstances so be fit to the user.For example, the user can not make night-vision devices produce the briliancy of supersaturation when wearing night-vision devices and observe the display message of LCD.Likewise, downgrade red signals R (28), for example, can its color range be downgraded zero, or shown in Fig. 5 curve b, downgrade its color range with a preset ratio.In like manner, the action of this special pattern starter gear 62 is identical with first embodiment, so no longer give unnecessary details.In addition, this main circuit device 60 and special pattern starter gear 62 also can be arranged in this display system 3.
Fig. 4 is the circuit box synoptic diagram according to the computer system of third embodiment of the invention.The computer system 700 of present embodiment exposure comprises a display system 4, one main circuit devices 60 at least, and a special pattern starter gear 62.This display system 4 is to be example with the liquid crystal display systems, but is not to be defined in this.Liquid crystal display systems 4 comprises a LCD 46; And an image processor 40 in order to export blue B, green G, red R (28) signal, supplies this LCD 46 to show.This image processor 40 comprises a display chip 42, one signal transmission channels 44, and a switchgear 48.This display chip 42 receives image input (not icon) basically, and after the processing of carrying out the image demonstration, output has, and output data red, blue, green (r, b, g) one-tenth branch is given signal transmission channel 44.
This main circuit device 60; Be responsible for the main running of this computer system 600; The for example computing of operating system, (image) signal of will video picture handling is transferred to image processor (30) and is handled, and exports red R, green G, blue B signal to LCD (36) with video picture.
The signal transmission channel 44 of present embodiment; For example comprise transistor-transistor-logic (TTL) or low voltage differential signal (LVDS) device; Data (r, b, g) in order to display chip 42 is seen off are carried out the conversion of necessity; And produce this red R (28), blue B, green G signal, and export this LCD 46 to.Be noted that red signals R (28) needs can transfer to this LCD 46 through this switchgear 48.Therefore; When the display system 4 of present embodiment is used under special circumstances (for example; The user is when wearing night-vision devices and observe the display message of LCD), the user blocks this red signals R (28) by closing (off) this switchgear 48, makes LCD 46 can't receive red signals R (28); That is the color range that is equal to red signals R (28) downgrades zero, so can not make the briliancy of night-vision devices generation supersaturation.This device for image 40 can be with software (not icon) or controller (not shown) one of are set in it ... Deng, control the mode of operation of this switchgear 48.The user can see through this special pattern starter gear 62 of unlatching and close (off) this switchgear 48.In like manner, the action of this special pattern starter gear 62 is identical with first embodiment, so no longer give unnecessary details.In addition, this main circuit device 60 and special pattern starter gear 62 also can be arranged in this display system 4.
Fig. 6 shows the flow chart of steps according to the present invention's display-apparatus driving method.Below will elaborate with reference to Fig. 5～7 in the lump.At first, receive a signal of video signal (step S1) by device for image (20,30 or 40).As previously mentioned; If this display device (2,3 or 4) will be used under special circumstances; The user should open special pattern starter gear 62 earlier; So the computer system of Fig. 5～7 (500,600 or 700) can see through software or hardware unit etc., detecting learns that whether present display (26,36 or 46) is in use (step S2) in particular cases.Use if display (26,36 or 46) lies in particular cases, then device for image (20,30 or 40) will utilize aforementioned variety of way, and the color range of red signal R is downgraded (step S3); Afterwards, again with blue B, green G and the red signals R after downgrading color range output supply the usefulness (step S4) of display (26,36 or 46).If display (26,36 or 46) is not to use in particular cases, device for image (20,30 or 40) then, normal output blue B, green G, and red signals R (downgrading without crossing) supply with use (the step S5) of display (26,36 or 46) demonstrations.
Though the present invention discloses as above with preferred embodiment; Right its is not in order to limiting the present invention, anyly has the knack of this art, in spirit that does not break away from the present invention and scope; When doing various changes and retouching, so the claim person of defining that the present invention's protection domain attaches after looking is as the criterion.
Claims (7)
1. a liquid crystal display systems is characterized in that, comprising:
One LCD is in order to show image; And
One image processor, the output red signal is to this LCD at least;
Wherein this image processor comprises a control chip, possesses the function of the gamma of this red signals color range of adjustment, and when receiving a trigger signals, this image processor downgrades the color range of this red signals.
2. liquid crystal display systems as claimed in claim 1 is characterized in that, this control chip downgrades the color range of this red signals to zero, or downgrades the color range of this red signals with a preset ratio.
3. liquid crystal display systems as claimed in claim 1 is characterized in that, more comprises one first software, in order to drive this control chip, to downgrade the action of this red signals color range.
4. a liquid crystal display systems is characterized in that,
One LCD is in order to show image; And
One image processor, the output red signal is to this LCD at least;
Wherein this image processor comprises:
One signal transmission channel to this red signals conversion of major general, exports this LCD to;
One switchgear is coupled between the red signals output and this LCD of this signal transmission channel;
Wherein, when this switchgear received a trigger signals, this switchgear cut out to cut off the red signals output from this signal transmission channel to this LCD.
5. liquid crystal display systems as claimed in claim 4 is characterized in that, more comprises one second software or a controller, in order to drive the action that this switchgear cuts off this red signals.
6. the driving method of a liquid crystal display systems, this liquid crystal display systems comprises a LCD, and an image processor; It is characterized in that this method comprises:
Receive a signal of video signal by this image processor;
Utilize this image processor to handle this signal of video signal, to produce at least one red signals; Wherein when this image processor receives a trigger signals, downgrade the color range of this red signals; And
Export red signals that this process downgrades color range to this display,
The wherein said color range that downgrades this red signals is to utilize one to possess the control chip of adjusting this red signals color range function, and is extremely zero with the color range that downgrades this red signals, perhaps downgrades the color range of this red signals with a preset ratio.
7. the driving method of a liquid crystal display systems, this liquid crystal display systems comprises a LCD, and an image processor; It is characterized in that this method comprises:
Receive a signal of video signal by this image processor;
Utilize this image processor to handle this signal of video signal, to produce at least one red signals; Wherein when this image processor receives a trigger signals, downgrade the color range of this red signals; And
Export red signals that this process downgrades color range to this LCD,
The wherein said color range that downgrades this red signals is to utilize a switchgear to downgrade, and this switchgear is coupled between the output and this LCD of this image processor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101988304A CN101685608B (en) | 2008-09-27 | 2008-09-27 | Display system and driving method thereof |
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| CN2008101988304A CN101685608B (en) | 2008-09-27 | 2008-09-27 | Display system and driving method thereof |
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| CN101685608B true CN101685608B (en) | 2012-04-18 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6758586B1 (en) * | 1998-02-24 | 2004-07-06 | Wilco International | Aircraft lighting means compatible with a night vision imaging system |
| US20050190117A1 (en) * | 2002-04-16 | 2005-09-01 | Siemens Aktiengesellschaft | Liquid crystal color display suitable for night-sight glasses |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6758586B1 (en) * | 1998-02-24 | 2004-07-06 | Wilco International | Aircraft lighting means compatible with a night vision imaging system |
| US20050190117A1 (en) * | 2002-04-16 | 2005-09-01 | Siemens Aktiengesellschaft | Liquid crystal color display suitable for night-sight glasses |
| US7224327B2 (en) * | 2002-04-16 | 2007-05-29 | Siemens Aktiengesellscaft | Liquid crystal color display suitable for night-sight glasses |
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| CN101685608A (en) | 2010-03-31 |
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Owner name: HANDA PRECISION ELECTRONIC (KUNSHAN) CO., LTD. Free format text: FORMER OWNER: FOSHAN SHUNDE DISTRICT MITAC PRECISION TECHNOLOGY CO., LTD. Effective date: 20130703 |
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Free format text: CORRECT: ADDRESS; FROM: 528308 FOSHAN, GUANGDONG PROVINCE TO: 215300 SUZHOU, JIANGSU PROVINCE |
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Effective date of registration: 20130703 Address after: 215300 No. second, 269 Avenue, comprehensive bonded area, Jiangsu, Kunshan Patentee after: Mitac Precision Technology (Kunshan) Corp. Address before: 528308 Guangdong Province, Foshan city Shunde District Lunjiao Street Chung Hei Lun Xing Zhong Lu Patentee before: Foshan Shunde District Mitac Precision Technology Co., Ltd. |