CN107293261B - A kind of combination brightness uniformity control system and its control method - Google Patents
A kind of combination brightness uniformity control system and its control method Download PDFInfo
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- CN107293261B CN107293261B CN201710639387.9A CN201710639387A CN107293261B CN 107293261 B CN107293261 B CN 107293261B CN 201710639387 A CN201710639387 A CN 201710639387A CN 107293261 B CN107293261 B CN 107293261B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 57
- 230000035807 sensation Effects 0.000 claims abstract description 26
- 206010034960 Photophobia Diseases 0.000 claims description 15
- 208000013469 light sensitivity Diseases 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 9
- 238000011897 real-time detection Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a kind of combination brightness uniformity control system, including optical inductor, corresponding each detection zone on each display backlight plate, the practical light sensation value of detection zone of the optical inductor for real-time detection corresponding to it；Circuit control system, the optical inductor are connected to the circuit control system；The circuit control system is used to obtain a reference value for the practical light sensation value variation, and the practical light sensation value is obtained from the optical inductor, and a reference value and practical light sensation value, when the absolute value of the difference of the practical light sensation value and a reference value of a certain detection zone exceeds set threshold value, the circuit control system is used to control the drive condition of LED light in backlight, and the brightness of the detection zone and other detection zones is made to keep uniform.The invention also discloses a kind of control methods of combination brightness uniformity control system.
Description
Technical Field
The invention relates to the field of spliced walls and the like, in particular to a system and a method for controlling the brightness uniformity of a spliced wall.
Background
With the development of display technology, the application of displays is becoming more and more widespread. Not only for television, monitors, industrial displays, medical displays, but also increasingly for public display applications. In public display application, a display is generally required to have a large display area so as to meet the requirements of people for long-distance viewing, large information display and the like. However, in the current state of development of LCD television displays, the conventional size is 32 inches to 55 inches, and if the LCD television displays are used for public display, a multi-screen splicing mode is required.
The spliced wall is composed of a plurality of display screens, and the display screens are spliced in a structure of 3X 3 or more, so that the probability of brightness difference among the screens is high. Especially, after the spliced wall is used after being lighted for a long time, due to the fact that the brightness of the LED on the backlight plate is attenuated, the brightness attenuation degrees of different display screens are different, the brightness attenuation degree difference between the different display screens is gradually amplified, and even the brightness difference which can not be accepted by human eyes can occur.
At present, most spliced screen manufacturers mainly concentrate on keeping the brightness of the display screen consistent when leaving the factory, and pay less attention to the brightness uniformity control of the spliced wall system after long-time work. The reason why the brightness of the spliced wall system is different after long-time work is as follows.
1) In whole concatenation wall system, the temperature that every piece module was located is different, and the heat that the module produced can upwards gather, leads to piling up the module temperature of concatenation wall upside and is higher than the module temperature of downside, and different operating temperature can lead to the luminance decay difference of LED lamp on the board that is shaded, as shown in figure 1, the LED lamp is under different operational environment temperatures, and the decay curve of luminance along with time can see there is obvious difference.
2) The difference in the batch property of the LED lamps in the backlight plate and the difference in the service life of the LED lamps of different suppliers may cause the difference in the actual brightness service life of each chip module. As shown in fig. 2, A, B, C represent 3 identically packaged LEDs from a supplier, respectively, assembled into a backlight and subjected to a long-time lighting experiment. It is obvious that the degree of brightness decay with time for LEDs from different suppliers under the same operating conditions is also very different.
Disclosure of Invention
The purpose of the invention is: the utility model provides a concatenation wall luminance homogeneity control system adds photo sensor on the board that is shaded, and the inside certain position's of real time monitoring board that is shaded illuminance, and then feeds back whole circuit control system, carries out the linkage regulation of the luminance of all modules through circuit control system to realize long-time work back, the luminance homogeneity between the different modules in the assurance concatenation wall that still can be better.
The technical scheme for realizing the purpose is as follows: a spliced wall brightness uniformity control system comprises light sensors, a control module and a control module, wherein the light sensors are correspondingly arranged in detection areas on backlight plates of display screens, and are used for detecting actual light sensing values of the detection areas corresponding to the light sensors in real time; the circuit control system is connected with the light sensor; the circuit control system is used for obtaining a reference value used for comparing the change of the actual light sensation value, obtaining the actual light sensation value from the light sensor, comparing the reference value with the actual light sensation value, and when the absolute value of the difference value between the actual light sensation value of a certain detection area and the reference value exceeds a set threshold value, the circuit control system is used for controlling the driving condition of the LED lamp on the backlight plate so as to enable the brightness of the detection area and other detection areas to be uniform.
In a preferred embodiment of the present invention, the photo sensors are disposed in the detection regions at positions that do not affect the quality of the backlight.
In a preferred embodiment of the present invention, the photo sensors are disposed between the LED lamps and/or on the side of the light guide plate.
In a preferred embodiment of the present invention, the driving conditions of the LED lamp include a driving current and a duty ratio.
Another object of the invention is: the control method of the system for controlling the brightness uniformity of the spliced wall is provided.
The technical scheme for realizing the purpose is as follows: a control method of the brightness uniformity control system of the spliced wall comprises the following steps: step S1) acquiring a reference value for comparing changes in actual light sensation values; step S2) acquiring the actual light sensitivity value of each detection area; step S3) calculating an absolute value of a difference between the actual light sensitivity value and the reference value; step S4), judging whether the absolute value exceeds the set threshold, if yes, defining the detection area as a brightness adjustment area and entering the step S5); if not, returning to the step S2); step S5) controls the driving conditions of the LED lamps in the brightness adjustment region so that the brightness of the brightness adjustment region and the other detection regions is kept uniform.
In a preferred embodiment of the invention, the reference value in the step S1) is a light sensation value at an initial state of each detection area or a light sensation value defined by a circuit control system.
In a preferred embodiment of the present invention, the photo sensors are disposed in the detection regions at positions that do not affect the quality of the backlight.
In a preferred embodiment of the present invention, the photo sensors are disposed between the LED lamps and/or on the side of the light guide plate.
In a preferred embodiment of the present invention, the driving conditions of the LED lamp in the step S5) include a driving current and a duty ratio.
In a preferred embodiment of the present invention, the step S5) includes the following steps: step S51) adjusting the driving current of the LED lamp in the brightness adjustment area or the driving current of the LED lamp in the other detection area to make the brightness of the detection area and the other detection area uniform.
The invention has the advantages that: the system and the method for controlling the brightness uniformity of the spliced wall improve the phenomenon that the brightness of the spliced wall is uneven due to the brightness attenuation difference of backlight LEDs in different modules after the spliced wall works for a long time in the use process.
Drawings
The invention is further explained below with reference to the figures and examples.
Fig. 1 is a schematic diagram of the life difference of an LED lamp operating at different ambient temperatures.
Fig. 2 is a graph showing the brightness decay difference of the same packaged LED of different suppliers after long-time operation.
Fig. 3 is a schematic diagram of optical simulation software analyzing light paths and distribution in a backlight.
Fig. 4 is a schematic diagram of a photosensor profile.
FIG. 5 is a flow chart of the steps of method embodiment 1.
Fig. 6 is a flow chart of method embodiment 2 steps.
Wherein,
1, a light sensor; 3, LED lamps;
4 a backlight panel.
Detailed Description
The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced.
Examples
As shown in fig. 4, a system for controlling the brightness uniformity of a tiled wall includes a photo sensor 1 and a circuit control system. The light sensor 1 is connected to the circuit control system.
In this embodiment, the photo sensors 1 are correspondingly disposed in each detection area on each display screen backlight plate 4.
One detection area or a plurality of detection areas can be arranged on the backlight plate 4 of each display screen.
It should be noted that, as shown in fig. 3, in the conventional backlight structure, it can be found that the illumination intensity of some positions is only related to the luminous intensity of the LED lamp 3. As can be seen from the optical trues software, after the optical architecture is determined, although the light emitted from the LED lamp 3 passes through the diffusion plate and the reflection sheet and is repeatedly folded back, the illuminance of different specific positions on the reflection sheet is different, but is constant for each fixed position (for example, A, B, C). Therefore, the photo sensor 1 can be disposed at some position that does not affect the taste of the backlight. As in the direct-type LED backlight frame, the photo sensor 1 may be disposed between two LED lamps 3. As in the case of the side-in backlight, the photo sensors 1 may be disposed between the LED lamps 3, or may be disposed on each side surface of the light guide plate.
Specifically, the optical sensor 1 is used for detecting an actual optical sensing value of a detection area corresponding to the optical sensor in real time. The circuit control system is used for obtaining a reference value for comparing the change of the actual light sensation value, obtaining the actual light sensation value from the light sensor 1, comparing the reference value with the actual light sensation value, and when the absolute value of the difference value between the actual light sensation value of a certain detection area and the reference value exceeds a set threshold value, the circuit control system is used for controlling the driving condition of the LED lamp 3 on the backlight plate 4 so as to enable the brightness of the detection area and other detection areas to be uniform. The driving conditions of the LED lamp 3 include a driving current and a duty ratio.
In this embodiment, the reference value may be set by selecting one value from the actual light sensation values, or may be set after being analyzed by the circuit control system. If a value is selected from the actual light sensation values for setting, the actual light sensation value in the initial state of the display screen can be preferably used as the reference value.
The control method realized based on the spliced wall brightness uniformity control system is as follows.
Method embodiment
As shown in fig. 5, a control method of the system for controlling the brightness uniformity of the spliced wall includes the following steps.
Step S1) acquiring a reference value for comparing changes in actual light sensation values; in step S1), the reference value is a light sensitivity value in the initial state of each detection region.
Step S2) the actual light sensitivity values of the respective detection areas are acquired.
Step S3) calculates an absolute value of a difference between the actual light sensitivity value and the reference value: namely, the actual light sensitivity value of each detection area is calculated and compared with the reference value of the detection area, so that the absolute value of the difference value between the actual light sensitivity value and the reference value is obtained.
Step S4), judging whether the absolute value exceeds the set threshold, if yes, defining the detection area as a brightness adjustment area and entering the step S5); if not, return is made to step S2).
Step S5) controls the driving conditions of the LED lamp 3 in the luminance adjustment region so that the luminance of the luminance adjustment region and the other detection regions is kept uniform. At this step S5) includes the steps of: step S51) adjusts the driving current of the LED lamp 3 in the brightness adjustment area or the driving current of the LED lamp 3 in the other detection area so that the brightness of the detection area and the other detection area is kept uniform.
Method example 2
As shown in fig. 6, a control method of the system for controlling the brightness uniformity of the spliced wall includes the following steps.
Step S1) acquiring a reference value for comparing changes in actual light sensation values; in step S1), the reference value is a light sensation value defined by the circuit control system.
Step S2) the actual light sensitivity values of the respective detection areas are acquired.
Step S3) calculates an absolute value of a difference between the actual light sensitivity value and the reference value: namely, the actual light sensitivity value of each detection area is calculated and compared with the reference value of the detection area, so that the absolute value of the difference value between the actual light sensitivity value and the reference value is obtained.
Step S4), judging whether the absolute value exceeds the set threshold, if yes, defining the detection area as a brightness adjustment area and entering the step S5); if not, return is made to step S2).
Step S5) controls the driving conditions of the LED lamp 3 in the luminance adjustment region so that the luminance of the luminance adjustment region and the other detection regions is kept uniform. At this step S5) includes the steps of: step S51) adjusts the driving current of the LED lamp 3 in the brightness adjustment area or the driving current of the LED lamp 3 in the other detection area so that the brightness of the detection area and the other detection area is kept uniform.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A control system for the brightness uniformity of a spliced wall is characterized by comprising
The light sensors are correspondingly arranged in the detection areas on the backlight plate of each display screen and are used for detecting the actual light sensing values of the detection areas corresponding to the light sensors in real time;
the circuit control system is connected with the light sensor;
the circuit control system is used for
Acquiring a reference value for comparing the change of the actual light sensation value; the reference value is an actual light sensation value of each detection area in the initial state of each display screen or a light sensation value defined by the circuit control system;
obtaining in real time the actual light sensation value from the light sensor, an
And comparing the reference value with the actual light sensitivity value, and when the absolute value of the difference value between the actual light sensitivity value of one detection area and the reference value exceeds a set threshold value, the circuit control system is used for controlling the driving condition of the LED lamp on the backlight plate so as to keep the brightness of the detection area and other detection areas uniform.
2. The system as claimed in claim 1, wherein the photo sensors are disposed in the detection regions at positions that do not affect the backlight quality.
3. The system for controlling the brightness uniformity of the spliced wall as claimed in claim 2, wherein the light sensors are disposed between the LED lamps and/or at the side of the light guide plate.
4. The system for controlling the brightness uniformity of the spliced wall as claimed in claim 1, wherein the driving conditions of the LED lamps comprise driving current and duty ratio.
5. The control method of the brightness uniformity control system of the spliced wall as claimed in claim 1, comprising the steps of:
step S1) acquiring the reference value;
step S2) real-time acquiring the actual light sensitivity value of each detection area;
step S3) calculating an absolute value of a difference between the actual light sensitivity value and the reference value;
step S4) determining whether the absolute value exceeds the set threshold, if so, defining the detection region as a brightness adjustment region and entering the brightness adjustment region
Step S5); if not, returning to the step S2);
step S5) controls the driving conditions of the LED lamps in the brightness adjustment region so that the brightness of the brightness adjustment region and the other detection regions is kept uniform.
6. The method as claimed in claim 5, wherein the light sensor is disposed in each detection area at a position that does not affect the quality of the backlight.
7. The control method of the system for controlling the brightness uniformity of the spliced wall as claimed in claim 5, wherein the light sensors are disposed between the LED lamps and/or at the side of the light guide plate.
8. The control method of the brightness uniformity control system of the spliced wall as claimed in claim 5, wherein the driving conditions of the LED lamps in the step S5) comprise driving current and duty ratio.
9. The control method of the brightness uniformity control system of the spliced wall as claimed in claim 8, wherein the step S5) comprises the steps of:
step S51) adjusting the driving current of the LED lamp in the brightness adjustment area or the driving current of the LED lamp in the other detection area to make the brightness of the detection area and the other detection area uniform.
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| CN201710639387.9A CN107293261B (en) | 2017-07-31 | 2017-07-31 | A kind of combination brightness uniformity control system and its control method |
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| CN201710639387.9A CN107293261B (en) | 2017-07-31 | 2017-07-31 | A kind of combination brightness uniformity control system and its control method |
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| CN107293261A CN107293261A (en) | 2017-10-24 |
| CN107293261B true CN107293261B (en) | 2019-08-13 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702376B (en) * | 2018-10-12 | 2021-06-01 | 浙江宇视科技有限公司 | Display module troubleshooting method and device |
| CN109238459A (en) * | 2018-11-13 | 2019-01-18 | 惠州西电仲恺人工智能联合创新实验室有限公司 | The online vision detection system of LED luminance |
| CN109637459A (en) * | 2018-11-26 | 2019-04-16 | 惠州市华星光电技术有限公司 | A kind of backlight back light brightness regulating method |
| WO2020177124A1 (en) * | 2019-03-07 | 2020-09-10 | 深圳市柔宇科技有限公司 | Display control method, display device and electronic device |
| CN109935219B (en) * | 2019-04-09 | 2020-08-11 | 惠州市华星光电技术有限公司 | Display method of spliced panel |
| CN111128027A (en) * | 2019-12-30 | 2020-05-08 | 上海天马微电子有限公司 | Display module and backlight brightness monitoring method |
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| CN102026003A (en) * | 2010-12-24 | 2011-04-20 | 广东威创视讯科技股份有限公司 | Method and device for correcting colors of multi-screen splicing wall |
| CN102282603A (en) * | 2009-01-20 | 2011-12-14 | 松下电器产业株式会社 | Display apparatus and display control method |
| CN102750931A (en) * | 2012-07-25 | 2012-10-24 | 广东威创视讯科技股份有限公司 | Method and device for adjusting conformity of spliced wall |
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2017
- 2017-07-31 CN CN201710639387.9A patent/CN107293261B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102282603A (en) * | 2009-01-20 | 2011-12-14 | 松下电器产业株式会社 | Display apparatus and display control method |
| CN102026003A (en) * | 2010-12-24 | 2011-04-20 | 广东威创视讯科技股份有限公司 | Method and device for correcting colors of multi-screen splicing wall |
| CN102750931A (en) * | 2012-07-25 | 2012-10-24 | 广东威创视讯科技股份有限公司 | Method and device for adjusting conformity of spliced wall |
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL China Star Optoelectronics Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |