CN104409453A - LED packaging structure, LED display system and bad lamp detection method - Google Patents
LED packaging structure, LED display system and bad lamp detection method Download PDFInfo
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- CN104409453A CN104409453A CN201410606083.9A CN201410606083A CN104409453A CN 104409453 A CN104409453 A CN 104409453A CN 201410606083 A CN201410606083 A CN 201410606083A CN 104409453 A CN104409453 A CN 104409453A
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Abstract
The invention relates to the LED display field and particularly relates to an LED packaging structure, an LED display system and a bad lamp detection method. The LED packaging structure comprises a main LED packaged in a first layer, a standby LED packaged in the second layer, and a photosensitive diode packaged in a third layer, wherein the three layers of structures are packaged through the integrated circuit technology and are respectively provided with an interface for external circuits. The LED packaging structure is directly packaged with the main LED and the standby LED, when the LED packaging structure is applied to the LED display system, if the main LED is in fault, switching to the standby LED for system operation can be directly carried out, and a display blackspot problem caused by the dead lamp in the LED display system can be effectively avoided.
Description
Technical field
The present invention relates to field of LED display, more specifically, relate to a kind of LED encapsulation structure, LED display system and bad lamp detection method.
Background technology
Be attached to by multiple color LED array the display system that PCB substrate forms and be called LED display system, this display system has the advantages such as brightness is high, bright in luster, visual angle is large, low in energy consumption.Along with the reduction of putting distance between LED, this systems grow is widely used in the industry of monitoring and broadcasting and TV.
In LED display system, each color LED lamp inside generally comprises the light-emitting diode chip for backlight unit of RGB three kinds of colors, the light emitting diode construction of current use in use for some time, easily causes electrical breakdown because of drive current reason that is excessive or exterior static.Destroyed LED will not be shinny or brightness is comparatively dark, in whole LED display system, form a pore, in the use scenes that radio, TV and film industries etc. are comparatively harsh, if when video camera is just taken in bad point, larger on program impact.
Based on the bad point problem in LED display system, in prior art, provide a kind of scheme by multiple LED chip parallel connection, after having LED chip to break down, replaced by other LED of its parallel connection, and corrected by brightness point by point adjustment.Although this scheme can avoid the stain problem occurring that bad lamp brings, but this scheme is in order to ensure the consistency of display effect, need to carry out gamma correction, and during gamma correction, need pointwise to carry out brightness adjustment, this depends on the equipment of specialty, and the contact staff needing professional knowledge is on the scene just can complete, the audient faced by this scheme is professional person, is not suitable for settling a dispute by the parties concerned themselves after common user pinpoints the problems.In addition, current big screen display screen is used widely, and when such scheme is applied to big screen display screen, increases the positioning difficulty of bad point, is difficult to based on such scheme the position finding bad point in large-screen.
Detect in the technical scheme of the bad point occurred in LED display system at another, what adopt is that the mode that resistance adds A/D converter detects the electric current of LED one by one to detect bad point in LED display system, this mode take curent change as Rule of judgment, but in practical application likely there is identical situation in the become reconciled electric current of lamp of bad lamp, therefore judge that the quality of lamp exists based on curent change certain undetected, that is this scheme very can not detect bad lamp.
Summary of the invention
The present invention, for overcoming at least one defect (deficiency) described in above-mentioned prior art, provides a kind of LED encapsulation structure, LED display system and bad lamp detection method, effectively can avoid the display stain problem that dead light bar is come in LED display system.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of LED encapsulation structure, comprise be encapsulated in ground floor main LED, be encapsulated in the backup LED of the second layer and be encapsulated in the photodiode of third layer, three-decker is packaged together by integrated circuit technology and leaves the interface of external circuits respectively.
Main LED and backup LED is directly packaged with in LED encapsulation structure of the present invention, directly switch backup LED when can there is bad lamp when being applied to LED display system in main LED and carry out work, effectively can avoid the display stain problem that dead light bar is come in LED display system.And also encapsulate photodiode in this LED encapsulation structure, when being applied to LED display system, photodiode can detect the luminance of main LED, cannot be switched to backup LED, thus ensure that each point of LED display system can normally show at main LED during normal luminous.The operating state of photodiode corresponds to the light and shade of main LED, thus can detect in main LED to there is bad lamp according to photodiode, provides switching standards for LED display system switches to backup LED.
A kind of LED display system, comprise drive circuit and LED chip, also comprise the control module be connected with drive circuit, described LED chip adopts LED encapsulation structure described above, drive circuit connects the main LED in LED encapsulation structure respectively and backs up LED, and photodiode is connected with control module; Drive circuit drives main LED to work, and controls drive circuit and switch to driving backup LED work when control module judges that main LED damages according to the real-time current of photodiode.
In LED display system of the present invention, main LED, backup LED and photodiode is encapsulated in each LED chip, utilize photodiode can detect the luminance of the main LED in each LED chip, main LED cannot normal luminous time by the control of control module, drive circuit is switched to and drives backup LED work, thus ensure that each point of LED display system can normally show.Owing to being all provided with backup LED in each LED chip, backup LED is all connected with drive circuit with main LED, when bad lamp appears in main LED, drive circuit can be switched to backup LED work in time, ensure the normal display of LED display system, effectively can avoid the display stain problem that dead light bar is come in LED display system.
And the present invention's utilization is that the luminance of photodiode to main LED detects, and be a corresponding photodiode of main LED, photodiode can respond according to the light and shade of main LED, accurately can detect the luminance of corresponding main LED, thus accurately can judge the bad lamp of main LED, the accuracy rate of detection is high.And all photodiodes can work simultaneously, detect all main LED, detection efficiency is high simultaneously.Further, due to the photodiode adopted, with low cost, compact, is easy to apply.
In addition, the current status that the present invention utilizes control module to focus quick diode automatically is monitored, and utilize control module automatically control drive circuit to main LED and backup LED switch, automaticity is high, without the need to equipment and the professional knowledge of specialty, audient can be professional person can be also common user, and Consumer's Experience is good, practical.
A kind of bad lamp detection method, carry out bad lamp detection to LED display system described above, described method comprises:
When main LED and backup LED comprises the LED chip of RGB three kinds of colors respectively, the red, green and blue LED chip in LED display system in all main LED is lighted in the timesharing of control module control drive circuit;
Control module up time judges whether there is main LED bad lamp in LED display system according to the real-time current of photodiode, if having, direct controlling and driving drives all backups LED works;
When main LED and backup LED comprises single primary colors LED chip respectively, control module controls all main LED in drive circuit driving LED display system and lights single primary colors LED chip;
Control module judges whether there is main LED bad lamp in LED display system according to the real-time current of photodiode, if having, direct controlling and driving drives all backups LED works.
In bad lamp detection method of the present invention, the situation of RGB three kinds of color LED chips is comprised respectively corresponding to main LED and backup LED, first the present invention controls by control module the LED chip that three kinds of colors in all LED are lighted in drive circuit timesharing, because photodiode can detect the light and shade of LED chip, therefore control module can judge whether have bad lamp in main LED according to the real-time current of photodiode, if have, control drive circuit and switch, thus stop the driving to main LED, be directly switch to and drive all backup LED to work.Owing to being all provided with backup LED and photodiode in each LED chip, the luminance of photodiode to main LED detects, and be a corresponding photodiode of main LED, photodiode can respond according to the light and shade of main LED, accurately can detect the luminance of corresponding main LED, thus accurately can judge the bad lamp of main LED, the accuracy rate detected is high, can switch main LED and backup LED in real time after detecting bad lamp, effectively can avoid the display stain problem that dead light bar is come in LED display system.And all photodiodes can work simultaneously, detect all main LED, detection efficiency is high simultaneously.Further, due to the photodiode adopted, with low cost, compact, is easy to apply.
In addition, the current status that bad lamp detection method of the present invention utilizes control module to focus quick diode automatically is monitored, and control drive circuit switches main LED and backup LED automatically, automaticity is high, without the need to equipment and the professional knowledge of specialty, audient can be professional person can be also common user, and Consumer's Experience is good, practical.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of LED encapsulation structure specific embodiment of the present invention.
Fig. 2 is the structural representation of a kind of LED display system specific embodiment of the present invention.
Fig. 3 is the flow chart of a kind of bad lamp detection method specific embodiment of the present invention.
Fig. 4 is the schematic diagram of antithetical phrase lamp plate location in a kind of bad lamp detection method of the present invention.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent;
In order to better the present embodiment is described, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product;
To those skilled in the art, in accompanying drawing, some known features and explanation thereof may be omitted is understandable.
In describing the invention, it will be appreciated that, orientation or the position relationship of the instruction such as term " longitudinal direction " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " only for describing object, and can not be interpreted as the quantity of instruction or hint relative importance or implicit indicated technical characteristic.Thus, one or more these features can be expressed or impliedly be comprised to the feature of " first ", " second " of restriction.In describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also can be indirectly connected by intermediary, the connection of two element internals can be said.For the ordinary skill in the art, concrete condition above-mentioned term can be understood at concrete meaning of the present invention.
Below in conjunction with drawings and Examples, technical scheme of the present invention is described further.
Embodiment 1
As shown in Figure 1, be the structural representation of a kind of LED encapsulation structure specific embodiment of the present invention.See Fig. 1, a kind of LED encapsulation structure of this specific embodiment, comprise be encapsulated in ground floor main LED1, be encapsulated in the backup LED2 of the second layer and be encapsulated in the photodiode 3 of third layer, three-decker is packaged together by integrated circuit technology and leaves the interface of external circuits respectively.
In a particular embodiment, main LED1, backup LED2 and the photodiode 3 that is used for detecting main LED luminance are directly packaged together by LED encapsulation structure, and compact conformation is small and exquisite, is suitable in LED display system.Main LED1 and backup LED2 is directly packaged with in this LED encapsulation structure, directly switch backup LED2 when can there is bad lamp when being applied to LED display system in main LED1 and carry out work, effectively can avoid the display stain problem that dead light bar is come in LED display system.And also encapsulate photodiode 3 in this LED encapsulation structure, when being applied to LED display system, photodiode 3 can detect the luminance of main LED1, cannot be switched to backup LED2, thus ensure that each point of LED display system can normally show at main LED during normal luminous.The operating state of photodiode 3 corresponds to the light and shade of main LED1, thus can detect in main LED1 to there is bad lamp according to photodiode 3, provides switching standards for LED display system switches to backup LED.In this LED encapsulation structure, a corresponding photodiode 3 of main LED1, realize man-to-man detection, detection efficiency is high.
In specific implementation process, the LED encapsulation structure of this specific embodiment can be applied to all-colour LED display system, also can be applicable to monochromatic LED display system.Accordingly, in LED encapsulation structure, main LED1 and backup LED2 comprises the LED chip of RGB three kinds of colors respectively or comprises monochromatic LED chip, after being applied to LED display system, can form all-colour LED display system or monochromatic LED display system.
In specific implementation process, the ground floor of LED encapsulation structure, the second layer and third layer are longitudinal overlaying structure, and namely main LED1, backup LED2 and photodiode 3 form overlaying structure in the vertical.Owing to adopting the three stacked structures added, compare with common LED and only increase height, Width does not increase, thus does not affect the some distance in LED display system between LED.
Embodiment 2
On the basis of embodiment 1, the present invention also provides a kind of LED display system.As shown in Figure 2, a kind of LED display system specific embodiment of the present invention comprises drive circuit 4 and LED chip 5, also comprise the control module 6 be connected with drive circuit 4, LED chip 5 adopts the LED encapsulation structure described in embodiment 1, drive circuit 4 connects the main LED1 in LED encapsulation structure respectively and backs up LED2, and photodiode 3 is connected with control module 6; Drive circuit 4 drives main LED1 to work, and controls drive circuit 4 and switch to driving backup LED2 work when control module 6 judges that main LED1 damages according to the real-time current of photodiode 3.
In LED display system of the present invention, main LED1, backup LED2 and photodiode 3 is encapsulated in each LED chip 5, drive circuit 4 can drive main LED1 also can drive backup LED2, photodiode 3 can detect the luminance of the main LED1 in each LED chip 5, main LED1 cannot normal luminous time by the control of control module 6, drive circuit 4 is switched to and drives backup LED2 work, thus ensure that each point of LED display system can normally show.Owing to being all provided with backup LED2 in each LED chip 5, backup LED2 is all connected with drive circuit 4 with main LED1, when bad lamp appears in main LED1, drive circuit 4 can be switched to backup LED2 work in time, ensure the normal display of LED display system, effectively can avoid the display stain problem that dead light bar is come in LED display system.
What utilize in this specific embodiment is that the luminance of photodiode 3 to main LED1 detects, and be a corresponding photodiode 3 of main LED1, photodiode 3 can respond according to the light and shade of main LED1, accurately can detect the luminance of corresponding main LED1, thus accurately can judge the bad lamp of main LED1, the accuracy rate of detection is high.And all photodiodes 3 can work under the control of control module 6 simultaneously, detect all main LED1, detection efficiency is high simultaneously.Further, due to the photodiode 3 adopted, with low cost, compact, is easy to apply.
In addition, the current status that this specific embodiment utilizes control module 6 to focus quick diode 3 automatically is monitored, and utilize the automatic drive circuit 4 that controls of control module 6 to switch main LED1 and backup LED2, automaticity is high, without the need to equipment and the professional knowledge of specialty, audient can be professional person can be also common user, and Consumer's Experience is good, practical.
In specific implementation process, in order to ensure the consistency of display effect, when control module 6 judges have main LED1 to damage, control drive circuit 4 switches to and drives all backup LED2 to work.Namely in whole LED display system, drive circuit 4 drives all main LED1 work simultaneously or drives all backup LED2 to work simultaneously, this make to have display consistency all main LED1 and there is display consistency all back up the state that LED2 work at the same time under ensure the display consistency of whole LED display system.Wherein, in LED display system, all main LED1 and all backup LED2 are respective all in advance corrects through brightness point by point, this trimming process can correct when product export, ensures that all main LED1 have consistency in display and all backup LED2 and have consistency in display.And can ensure that drive circuit 4 still can ensure the consistency of display effect in LED display system when being switched to all backup LED work, user is without the need to carrying out the correction of brightness point by point.
In specific implementation process, the LED chip in this specific embodiment can be attached in PCB substrate after adopting the LED encapsulation structure described in embodiment 1, then assembles formation LED display system together in conjunction with other electronics such as drive circuit 3, control modules 6.
According to the scheme of this specific embodiment, after LED display system powers on, the main LED1 work of usual acquiescence drive circuit 4 Direct driver, photodiode 3 in each LED chip 5 detects the luminance in respective main LED1 chip, if the wafer damage in certain main LED1, the electric current of photodiode 3 can obviously diminish, user can monitor by the electric current of the photodiode 3 in control module 6 pairs of LED display system the damage judging main LED1 chips, drive circuit 4 in LED display system is switched to backup LED2 by control module 6 automatically, worked by backup LED2.Now control module 6 can also notify user by the mode of alarm, and user can contact contact staff and change the sub-lamp plate that main LED1 damages.
In specific implementation process, conveniently the real-time current of control module 6 pairs of photodiodes is monitored, one is preferred embodiment arrange current comparator in control module 6, the current threshold of setting one for comparing with the real-time current of photodiode 3 in current comparator, when by current comparator, control module 6 judges that the real-time current of photodiode 3 is less than the current threshold of setting, then illustrate in the main LED1 of this photodiode 3 correspondence have wafer damage.
Embodiment 3
On the basis of embodiment 1 and embodiment 2, the present invention also provides a kind of bad lamp detection method.As shown in Figure 3, be the flow chart of a kind of bad lamp detection method of the present invention.See Fig. 3, a kind of bad lamp detection method of this specific embodiment carries out bad lamp detection to the LED display system of embodiment 2, in this embodiment, the main LED that LED chip in LED display system is corresponding and backup LED comprises the LED chip of red green three kinds of colors respectively, that is, in a LED chip, the main LED chip of encapsulation comprises the LED chip of red green three kinds of colors, and backup LED also comprises the LED chip of red green three kinds of colors.The concrete steps of described method comprise:
The red, green and blue LED chip in LED display system in all main LED is lighted in the timesharing of control module control drive circuit; Wherein, described timesharing is lighted to refer to and is lighted RGB chips all in LED display system three kinds of chips respectively in different time sections, in the process, RGB three kinds of colors light order be arbitrary, control module can preset lighting sequentially of three kinds of color chips, and user also can modify when follow-up use.
Control module up time judges whether there is main LED bad lamp in LED display system according to the real-time current of photodiode, if having, direct controlling and driving drives all backups LED works; Wherein, as shown in Figure 3, suppose to light order for light ruddiness, green glow and blue light successively, then when lighting ruddiness, control module judges whether that the red light display in main LED is abnormal, if have, be directly switch to backup LED, otherwise then light green glow, control module judges whether that the green light display in main LED is abnormal, if have, be directly switch to backup LED, otherwise then light blue light, control module judges whether that the blue lamp display in main LED is abnormal, if having, is directly switch to backup LED.
In the bad lamp detection method of this specific embodiment, the situation of RGB three kinds of color LED chips is comprised respectively corresponding to main LED and backup LED, first the present invention controls by control module the LED chip that three kinds of colors in all LED are lighted in drive circuit timesharing, because photodiode can detect the light and shade of LED chip, therefore control module can judge whether have bad lamp in main LED according to the real-time current of photodiode, if have, control drive circuit and switch, thus stop the driving to main LED, be directly switch to and drive all backup LED to work.Owing to being all provided with backup LED and photodiode in each LED chip, the luminance of photodiode to main LED detects, and be a corresponding photodiode of main LED, photodiode can respond according to the light and shade of main LED, accurately can detect the luminance of corresponding main LED, thus accurately can judge the bad lamp of main LED, the accuracy rate detected is high, can switch main LED and backup LED in real time after detecting bad lamp, effectively can avoid the display stain problem that dead light bar is come in LED display system.And all photodiodes can work simultaneously, detect all main LED, detection efficiency is high simultaneously.Further, due to the photodiode adopted, with low cost, compact, is easy to apply.
In addition, the current status that the bad lamp detection method of this specific embodiment utilizes control module to focus quick diode automatically is monitored, and control drive circuit switches main LED and backup LED automatically, automaticity is high, without the need to equipment and the professional knowledge of specialty, audient can be professional person can be also common user, and Consumer's Experience is good, practical.
In specific implementation process, in order to change bad lamp in time, this specific embodiment, after having judged main LED bad lamp, also positions bad lamp.
Due in a LED display system, the quantity of LED is quite huge, utilize control module to damaged etc. position alarm can more complicated, even if tell that user damages the coordinate of LED, user is also difficult to position concrete LED in LED display system, for this reason, this specific embodiment adopts antithetical phrase lamp plate to be that unit positions bad lamp, every sub-lamp plate structurally divides with PCB substrate, every sub-lamp plate generally comprises multiple LED chip, locate relative to bad lamp, the sub-lamp plate location of the present invention to bad lamp place is relatively simple.Concrete locate mode is:
In units of sub-lamp plate, the LED encapsulation structure in LED display system is divided;
Navigate to main LED corresponding to bad lamp according to bad lamp position, according to the main LED navigated to, the sub-lamp plate belonging to it is positioned.
In a preferred embodiment, as shown in Figure 4, during location, carry out assignment to the LED chip of all colours in LED display system, wherein normal LED chip assignment 1, to bad lamp assignment 0, thus obtains the value of each main LED: I
lamp=I
redaMP.AMp.Amp I
greenaMP.AMp.Amp I
blue;
The state value of sub-lamp plate is calculated: I according to the value of each main LED
sub-lamp plate=I
lamp 1aMP.AMp.Amp I
lamp 2aMP.AMp.Amp I
lamp 3aMP.AMp.Amp I
lamp n; Main LED position corresponding to bad lamp is located according to the state value of sub-lamp plate.State value science and technology by reading sub-lamp plate during concrete operations navigates to the position at bad lamp place, thus changes the sub-lamp plate of correspondence.Embodiment 4
As different from Example 3, in the LED display system that bad lamp detection method in this specific embodiment is corresponding, the main LED that LED chip is corresponding and backup LED comprises single primary colors LED chip respectively, that is, in a LED chip, the main LED chip of encapsulation only comprises single primary colors LED chip, and backup LED also only comprises single primary colors LED chip.The concrete steps of this specific embodiment comprise:
The single primary colors chip in LED display system in all main LED lighted by control module control drive circuit;
Control module judges whether there is main LED bad lamp in LED display system according to the real-time current of photodiode, if having, direct controlling and driving drives all backups LED works;
In the bad lamp detection method of this specific embodiment, the situation of single primary colors LED chip is only comprised corresponding to main LED and backup LED, first the present invention controls by control module single primary colors LED chip that the main LED in all LED lighted by drive circuit, because photodiode can detect the light and shade of LED chip, whether single primary colors LED chip that therefore control module can judge in main LED according to the real-time current of photodiode has bad lamp, if have, control drive circuit and switch, thus stop the driving to main LED, be directly switch to and drive all backup LED to work.Owing to being all provided with backup LED and photodiode in each LED chip, the luminance of photodiode to main LED detects, and be a corresponding photodiode of main LED, photodiode can respond according to the light and shade of main LED, accurately can detect the luminance of corresponding main LED, thus accurately can judge the bad lamp of main LED, the accuracy rate detected is high, can switch main LED and backup LED in real time after detecting bad lamp, effectively can avoid the display stain problem that dead light bar is come in LED display system.And all photodiodes can work simultaneously, detect all main LED, detection efficiency is high simultaneously.Further, due to the photodiode adopted, with low cost, compact, is easy to apply.
In addition, the current status that the bad lamp detection method of this specific embodiment utilizes control module to focus quick diode automatically is monitored, and control drive circuit switches main LED and backup LED automatically, automaticity is high, without the need to equipment and the professional knowledge of specialty, audient can be professional person can be also common user, and Consumer's Experience is good, practical.
In specific implementation process, in order to change bad lamp in time, this specific embodiment, after having judged main LED bad lamp, also positions bad lamp.
Due in a LED display system, the quantity of LED is quite huge, utilize control module to damaged etc. position alarm can more complicated, even if tell that user damages the coordinate of LED, user is also difficult to position concrete LED in LED display system, for this reason, this specific embodiment adopts antithetical phrase lamp plate to be that unit positions bad lamp, every sub-lamp plate structurally divides with PCB substrate, every sub-lamp plate generally comprises multiple LED chip, locate relative to bad lamp, the sub-lamp plate location of the present invention to bad lamp place is relatively simple.Concrete locate mode is:
In units of sub-lamp plate, the LED encapsulation structure in LED display system is divided;
Navigate to main LED corresponding to bad lamp according to bad lamp position, according to the main LED navigated to, the sub-lamp plate belonging to it is positioned.
In a preferred embodiment, as shown in Figure 4, during location, carry out assignment to the LED chip of all colours in LED display system, wherein normal LED chip assignment 1, to bad lamp assignment 0, thus obtains the value of each main LED: I
lamp=I
primary colors;
The state value of sub-lamp plate is calculated: I according to the value of each main LED
sub-lamp plate=I
lamp 1aMP.AMp.Amp I
lamp 2aMP.AMp.Amp I
lamp 3aMP.AMp.Amp I
lamp n; Main LED position corresponding to bad lamp is located according to the state value of sub-lamp plate.State value science and technology by reading sub-lamp plate during concrete operations navigates to the position at bad lamp place, thus changes the sub-lamp plate of correspondence.
Relative to embodiment 3, owing to only comprising single primary colors LED chip in each main LED, control procedure and testing process simple relative to embodiment 3.
The corresponding same or analogous parts of same or analogous label;
Describe in accompanying drawing position relationship for only for exemplary illustration, the restriction to this patent can not be interpreted as;
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection range that all should be included in the claims in the present invention.
Claims (10)
1. a LED encapsulation structure, it is characterized in that, comprise be encapsulated in ground floor main LED, be encapsulated in the backup LED of the second layer and be encapsulated in the photodiode of third layer, three-decker is packaged together by integrated circuit technology and leaves the interface of external circuits respectively.
2. LED encapsulation structure according to claim 1, is characterized in that, described main LED and backup LED comprises the LED chip of RGB three kinds of colors respectively or comprises monochromatic LED chip.
3. LED encapsulation structure according to claim 1, is characterized in that, the ground floor of LED encapsulation structure, the second layer and third layer are longitudinal overlaying structure.
4. a LED display system, comprise drive circuit and LED chip, it is characterized in that, also comprise the control module be connected with drive circuit, described LED chip adopts the LED encapsulation structure described in any one of claim 1-3, drive circuit connects the main LED in LED encapsulation structure respectively and backs up LED, and photodiode is connected with control module; Drive circuit drives main LED to work, and controls drive circuit and switch to driving backup LED work when control module judges that main LED damages according to the real-time current of photodiode.
5. LED display system according to claim 4, is characterized in that, arranges current comparator in described control module, the current threshold of setting one for comparing with the actual current of photodiode in current comparator.
6. LED display system according to claim 4, is characterized in that, when control module judges have main LED to damage, control drive circuit switches to and drives all backup LED to work.
7. a bad lamp detection method, is characterized in that, carry out bad lamp detection to LED display system according to claim 4, described method comprises:
When main LED and backup LED comprises the LED chip of RGB three kinds of colors respectively, the red, green and blue LED chip in LED display system in all main LED is lighted in the timesharing of control module control drive circuit;
Control module up time judges whether there is main LED bad lamp in LED display system according to the real-time current of photodiode, if having, direct controlling and driving drives all backups LED works;
When main LED and backup LED comprises single primary colors LED chip respectively, control module controls all main LED in drive circuit driving LED display system and lights single primary colors LED chip;
Control module judges whether there is main LED bad lamp in LED display system according to the real-time current of photodiode, if having, direct controlling and driving drives all backups LED works.
8. bad lamp detection method according to claim 7, is characterized in that, after having judged main LED bad lamp, also positions bad lamp.
9. bad lamp detection method according to claim 8, it is characterized in that, concrete locate mode is:
In units of sub-lamp plate, the LED encapsulation structure in LED display system is divided;
Navigate to main LED corresponding to bad lamp according to bad lamp position, according to the main LED navigated to, the sub-lamp plate belonging to it is positioned.
10. bad lamp detection method according to claim 9, is characterized in that, during location, by normal LED chip assignment 1, to bad lamp assignment 0, thus obtains the value of each main LED: I
lamp=I
redaMP.AMp.Amp I
greenaMP.AMp.Amp I
blueor I
lamp=I
primary colors;
The state value of sub-lamp plate is calculated: I according to the value of each main LED
sub-lamp plate=I
lamp 1aMP.AMp.Amp I
lamp 2aMP.AMp.Amp I
lamp 3aMP.AMp.Amp I
lamp n; Main LED position corresponding to bad lamp is located according to the state value of sub-lamp plate.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104936341A (en) * | 2015-06-01 | 2015-09-23 | 安徽星烁科技有限公司 | Graphical LED device with backup restoration function |
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| CN110211532B (en) * | 2018-12-25 | 2020-12-18 | 友达光电股份有限公司 | Display device and driving method thereof |
| CN111063310A (en) * | 2020-01-07 | 2020-04-24 | 业成科技（成都）有限公司 | Display and brightness adjusting method thereof |
| CN112614863A (en) * | 2020-12-15 | 2021-04-06 | 苏州芯聚半导体有限公司 | Micro light-emitting diode display panel, dead pixel repairing method and display |
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| CN112562556B (en) * | 2020-12-22 | 2022-08-02 | 北京市轨道交通运营管理有限公司 | Ceiling guide display board and testing method |
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