Organic display panel and brightness uniformity correction method

Abstract

The invention relates to the technical field of organic display panels, and discloses an organic display panel, which comprises an organic display panel shell; the pixel electrode unit is arranged at the bottom of the reflector plate, a driving circuit layer is mounted at the bottom of the pixel electrode unit, organic light-emitting diode units are uniformly distributed at the bottom of the driving circuit layer, and a brightness correction module is mounted at the bottom of each organic light-emitting diode unit; and the sealing strip is arranged on the upper surface of the organic display panel shell. The invention discloses a brightness uniformity correction method of an organic display panel. The method comprises the following steps: starting an initialization program, identifying a brightness abnormal region, calculating a current compensation amount, and performing current compensation. The degradation of the organic light-emitting diode unit can be prevented from being accelerated in an extreme temperature and humidity environment through the sealing strip; the brightness detection unit, the control unit and the compensation unit which are additionally arranged can prevent the organic light-emitting diode unit from forming visible dark spots or bright spots, and local dark spots or bright spots on the OLED screen can be effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of organic display panels, and particularly to an organic display panel and a method for correcting brightness uniformity. Background Art

[0002] An organic display panel is a self-luminous display technology with advantages such as high contrast ratio, fast response time, wide viewing angle, and flexible display. However, it also has problems such as low brightness, short lifespan, and easy screen burn-in. The method for correcting brightness uniformity aims to solve the problem of uneven brightness during panel display to improve the display effect.

[0003] However, due to the difference in the aging speed of organic materials after long-term use of the OLED screen, brightness unevenness will occur. And the superposition of manufacturing defects leads to abnormal current distribution. At the same time, long-term high-brightness display, static image burn-in, or extreme temperature and humidity environment will accelerate the degradation of materials in specific areas. Moreover, the aging or physical damage of the driving circuit further exacerbates the local brightness imbalance, ultimately forming visible dark spots or bright spots, resulting in local dark spots or bright spots on the OLED screen. Summary of the Invention

[0004] (I) Technical Problems to be Solved Aiming at the deficiencies of the prior art, the present invention provides an organic display panel and a method for correcting brightness uniformity to solve the problem that long-term high-brightness display, static image burn-in, or extreme temperature and humidity environment will accelerate the degradation of materials in specific areas, and the aging or physical damage of the driving circuit further exacerbates the local brightness imbalance, ultimately forming visible dark spots or bright spots, resulting in local dark spots or bright spots on the OLED screen as mentioned in the above background art.

[0005] (II) Technical Solutions To achieve the above object, the present invention provides the following technical solutions: An organic display panel, comprising: An outer shell of the organic display panel, a reflective sheet is installed inside the outer shell of the organic display panel, a light guide plate is installed on the upper surface of the reflective sheet, a diffusion sheet is installed on the upper surface of the light guide plate, and a brightness enhancement sheet is installed on the upper surface of the diffusion sheet; A pixel electrode unit, arranged at the bottom of the reflective sheet, a driving circuit layer is installed at the bottom of the pixel electrode unit, organic light-emitting diode units are evenly distributed at the bottom of the driving circuit layer, and a brightness correction module is installed at the bottom of the organic light-emitting diode units; A brightness detection unit, arranged on the surface of the brightness correction module, a control unit is installed on the surface of the brightness detection unit, a compensation unit is installed on the surface of the control unit, a temperature sensor is installed on the surface of the brightness correction module, and a control panel is installed on the surface of the outer shell of the organic display panel; The sealing strip is arranged on the upper surface of the organic display panel housing. Bolts are screwed at the four corners of the upper surface of the sealing strip. A cover plate is installed at the bottom of the organic display panel housing, and threaded rods are screwed at the four corners of the bottom of the cover plate.

[0006] Preferably, the sealing strip is of a loop design, and a sealing cushion layer is installed on the surface of the sealing strip. The connection between the organic display panel housing and the light enhancement film can be sealed through the sealing strip.

[0007] Preferably, a light intensity sensor is installed inside the organic display panel housing, and an optical detection device is installed on the surface of the organic display panel housing. The optical detection device is coupled to the back of the substrate through an optical fiber for non-contact brightness sampling. The light intensity sensor can detect environmental data and can dynamically adjust the target brightness threshold to match the human eye perception characteristics.

[0008] Preferably, the organic light-emitting diode unit is of an in-built design, and the organic light-emitting diode unit is embedded below the pixel electrode unit.

[0009] A method for correcting the brightness uniformity of an organic display panel includes the following steps: S1. Start the initialization program: Start the initialization program through the control panel, and obtain the initial brightness distribution data of the organic light-emitting diode unit through the brightness detection unit; S2. Identify the brightness abnormal area: Compare the initial brightness distribution data with a preset target uniformity threshold to identify the brightness abnormal area, and the abnormality includes local over-brightness or over-darkness; S3. Calculate the current compensation amount: Based on the brightness deviation value of the abnormal area, calculate the corresponding current compensation amount through the control unit; S4. Current compensation: Use the compensation unit to superimpose the current compensation amount on the corresponding drive signal of the drive circuit layer in real time; S5. Dynamically maintain the brightness: Periodically execute steps S1 - S4 to dynamically maintain the brightness uniformity, and the interval between periods is adaptively adjusted according to the aging rate of the organic light-emitting diode unit; S6. Maintain the brightness uniformity. When it is detected that the brightness attenuation of the organic light-emitting diode unit exceeds the first threshold, trigger the emergency compensation mode, increase its drive current and synchronously reduce the current of adjacent units to prevent the crosstalk effect. When it is detected that the brightness overload of the organic light-emitting diode unit exceeds the second threshold, start the pixel refresh mechanism to reset the threshold voltage of the driving TFT.

[0010] Preferably, the compensation unit injects a compensation current into the drive circuit through capacitive coupling and superimposes a compensation voltage on the gamma correction circuit to indirectly adjust the drive current.

[0011] Preferably, the image processor connected to the control panel stores a color correction matrix in advance, which is used to further optimize the gamut consistency of the displayed color after the brightness correction module performs the correction.

[0012] Advantages Compared with the prior art, the present invention provides an organic display panel and a brightness uniformity correction method, which have the following advantages: 1. For the organic display panel and the brightness uniformity correction method, the installation opening of the organic display panel housing can be sealed by the sealing strip and the cover plate, and the sealing strip can seal the connection between the organic display panel housing and the light enhancement film, which can reduce the entry of external moisture into the interior of the organic display panel and prevent the extreme temperature and humidity environment from accelerating the degradation of the organic light-emitting diode units; 2. For the organic display panel and the brightness uniformity correction method, the added brightness detection units are distributed in the pixel gaps or edge regions of the organic light-emitting diode units to collect the actual brightness values of each unit in real time. The control unit uses an adaptive algorithm, which includes the least squares fitting, the ambient light intensity compensation model or the machine learning prediction model. The compensation unit can convert the compensation parameters into current adjustment signals and achieve brightness correction by adjusting the gate voltage or source current of the TFT, thereby avoiding the formation of visible dark spots or bright spots on the organic light-emitting diode units; 3. For the organic display panel and the brightness uniformity correction method, the initial brightness distribution data of the organic light-emitting diode units are obtained through the brightness detection units. Based on the brightness deviation values of the abnormal regions, the corresponding current compensation amounts are calculated by the control unit, and the current compensation amounts are superimposed on the corresponding drive signals of the drive circuit layer in real time by the compensation unit. When it is detected that the brightness attenuation of the organic light-emitting diode units exceeds the first threshold, an emergency compensation mode is triggered to increase its drive current and simultaneously reduce the current of adjacent units to prevent the color bleeding effect. When it is detected that the brightness overload of the organic light-emitting diode units exceeds the second threshold, a pixel refresh mechanism is started to reset the threshold voltage of the driving TFT, which can effectively avoid local dark spots or bright spots on the OLED screen. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a schematic cross-sectional structural diagram of the present invention; Figure 3 It is a schematic structural diagram of the brightness correction module of the present invention.

[0014] In the figure: 1. Organic display panel housing; 2. Reflector; 3. Light guide plate; 4. Diffusion sheet; 5. Brightness enhancement film; 6. Pixel electrode unit; 7. Driving circuit layer; 8. Organic light-emitting diode unit; 9. Brightness correction module; 91. Brightness detection unit; 92. Control unit; 93. Compensation unit; 10. Temperature sensor; 11. Light intensity sensor; 12. Optical detection device; 13. Control panel; 14. Sealing strip; 15. Bolt; 16. Cover plate; 17. Threaded rod. Detailed implementation manner

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0016] The present invention provides a technical solution, an organic display panel and a brightness uniformity correction method. Please refer to Figure 1 , including an organic display panel housing 1. Please refer to Figure 2 , a reflector 2 is installed inside the organic display panel housing 1, a light guide plate 3 is installed on the upper surface of the reflector 2, a diffusion sheet 4 is installed on the upper surface of the light guide plate 3, and a brightness enhancement film 5 is installed on the upper surface of the diffusion sheet 4; A pixel electrode unit 6 is provided at the bottom of the reflector 2. A driving circuit layer 7 is installed at the bottom of the pixel electrode unit 6. Organic light-emitting diode units 8 are evenly distributed at the bottom of the driving circuit layer 7. A brightness correction module 9 is installed at the bottom of the organic light-emitting diode units 8; Please refer to Figure 3 , a brightness detection unit 91 is provided on the surface of the brightness correction module 9. A control unit 92 is installed on the surface of the brightness detection unit 91. A compensation unit 93 is installed on the surface of the control unit 92. Please refer to Figure 2 , a temperature sensor 10 is installed on the surface of the brightness correction module 9. Please refer to Figure 1 , a control panel 13 is installed on the surface of the organic display panel housing 1; A sealing strip 14 is provided on the upper surface of the organic display panel housing 1. Bolts 15 are screwed at the four corners of the upper surface of the sealing strip 14. A cover plate 16 is installed at the bottom of the organic display panel housing 1. Threaded rods 17 are screwed at the four corners of the bottom of the cover plate 16; The installation opening of the organic display panel housing 1 can be sealed by the sealing strip 14 and the cover plate 16, and the sealing strip 14 can seal the connection between the organic display panel housing 1 and the brightness enhancement film 5, which can reduce the entry of external moisture into the interior of the organic display panel and prevent the extreme temperature and humidity environment from accelerating the degradation of the organic light-emitting diode unit 8; The organic light-emitting diode units 8 are arranged in a matrix inside the organic display panel housing 1, and each organic light-emitting diode unit 8 includes an anode, an organic light-emitting layer, and a cathode stacked in sequence; The driving circuit layer 7 includes a thin-film transistor TFT array, and each TFT independently controls the driving current of the corresponding organic light-emitting diode unit 8; The brightness detection units 91 are distributed in the pixel gaps or edge regions of the organic light-emitting diode units 8 for collecting the actual brightness values of each unit in real time; The control unit 92 is electrically connected to the brightness detection unit 91 and is configured to generate dynamic compensation parameters based on the difference between the actual brightness value and the target brightness value. The control unit 92 adopts an adaptive algorithm, and the algorithm includes least squares fitting, ambient light intensity compensation model, or machine learning prediction model; The compensation unit 93 is connected to the control unit 92 and the driving circuit layer 7, and is used to convert the compensation parameters into current adjustment signals and achieve brightness correction by adjusting the gate voltage or source current of the TFT; The temperature sensor 10 is used to monitor the temperature change of the organic light-emitting diode unit 8, and the control unit 92 dynamically adjusts the compensation parameters according to the temperature change to offset the influence of temperature on the luminous efficiency.

[0017] The sealing strip 14 is designed in a loop shape, and a sealing cushion layer is installed on the surface of the sealing strip 14. The connection between the organic display panel housing 1 and the brightness enhancement film 5 can be sealed by the sealing strip 14.

[0018] Please refer to Figure 1 , a light intensity sensor 11 is installed inside the organic display panel housing 1, and an optical detection device 12 is installed on the surface of the organic display panel housing 1. The optical detection device 12 performs non-contact brightness sampling through optical fiber coupling to the back of the substrate. The light intensity sensor 11 can detect environmental data and can dynamically adjust the target brightness threshold to match the human eye perception characteristics.

[0019] The organic light-emitting diode unit 8 is of an embedded design, and the organic light-emitting diode unit 8 is embedded below the pixel electrode unit 6.

[0020] A method for correcting the brightness uniformity of an organic display panel includes the following steps: S1. Start the initialization program: Start the initialization program through the control panel 13, and obtain the initial brightness distribution data of the organic light-emitting diode unit 8 through the brightness detection unit 91; S2. Identify the brightness abnormal area: Compare the initial brightness distribution data with the preset target uniformity threshold to identify the brightness abnormal area, where the abnormality includes local overbrightness or overdarkness; S3. Calculate the current compensation amount: Based on the brightness deviation value of the abnormal area, calculate the corresponding current compensation amount through the control unit 92; S4. Current compensation: Use the compensation unit 93 to superimpose the current compensation amount on the corresponding drive signal of the drive circuit layer 7 in real time; S5. Dynamically maintain brightness: Periodically execute steps S1 - S4 to dynamically maintain brightness uniformity, and the interval between periods is adaptively adjusted according to the aging rate of the organic light-emitting diode unit 8; S6. Maintain brightness uniformity. When it is detected that the brightness attenuation of the organic light-emitting diode unit 8 exceeds the first threshold, trigger the emergency compensation mode, increase its drive current and synchronously reduce the current of adjacent units to prevent the color bleeding effect. When it is detected that the brightness overload of the organic light-emitting diode unit 8 exceeds the second threshold, start the pixel refresh mechanism to reset the threshold voltage of the driving TFT.

[0021] The compensation unit 93 injects a compensation current into the drive circuit through capacitive coupling and superimposes a compensation voltage on the gamma correction circuit to indirectly adjust the drive current.

[0022] The image processor connected to the control panel 13 pre-stores a color correction matrix, which is used to further optimize the gamut consistency of the displayed color after the brightness correction module 9 performs the correction.

[0023] When this solution is in operation: First, the sealing strip 14 and the cover plate 16 can seal the installation opening of the organic display panel housing 1, and the sealing strip 14 can seal the connection between the organic display panel housing 1 and the light enhancement film 5, reducing the entry of external moisture into the interior of the organic display panel and preventing the extreme temperature and humidity environment from accelerating the degradation of the organic light-emitting diode unit 8. Then, the brightness detection unit 91 is distributed in the pixel gaps or edge regions of the organic light-emitting diode unit 8 to collect the actual brightness values of each unit in real time. The control unit 92 uses an adaptive algorithm, which includes the least squares fitting, ambient light intensity compensation model, or machine learning prediction model. Through the compensation unit 93, the compensation parameters can be converted into current adjustment signals, and the brightness correction can be achieved by adjusting the gate voltage or source current of the TFT, thereby avoiding the formation of visible dark or bright spots on the organic light-emitting diode unit 8. Finally, the brightness detection unit 91 obtains the initial brightness distribution data of the organic light-emitting diode unit 8. Based on the brightness deviation value of the abnormal region, the control unit 92 calculates the corresponding current compensation amount, and the compensation unit 93 superimposes the current compensation amount on the corresponding drive signal of the drive circuit layer 7 in real time. When it is detected that the brightness attenuation of the organic light-emitting diode unit 8 exceeds the first threshold, an emergency compensation mode is triggered to increase its drive current and simultaneously reduce the current of adjacent units to prevent color bleeding effect. When it is detected that the brightness overload of the organic light-emitting diode unit 8 exceeds the second threshold, a pixel refresh mechanism is started to reset the threshold voltage of the driving TFT, effectively avoiding local dark or bright spots on the OLED screen.

[0024] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0025] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An organic display panel, characterized in that: include: An organic display panel housing (1), wherein a reflective sheet (2) is installed inside the organic display panel housing (1), a light guide plate (3) is installed on the upper surface of the reflective sheet (2), a diffusion sheet (4) is installed on the upper surface of the light guide plate (3), and a brightness enhancement sheet (5) is installed on the upper surface of the diffusion sheet (4); A pixel electrode unit (6) is arranged at the bottom of the reflective sheet (2); a driving circuit layer (7) is installed at the bottom of the pixel electrode unit (6); organic light emitting diode units (8) are evenly arranged at the bottom of the driving circuit layer (7); and a brightness correction module (9) is installed at the bottom of the organic light emitting diode unit (8); A brightness detection unit (91) is arranged on the surface of the brightness correction module (9); a control unit (92) is mounted on the surface of the brightness detection unit (91); a compensation unit (93) is mounted on the surface of the control unit (92); a temperature sensor (10) is mounted on the surface of the brightness correction module (9); and a control panel (13) is mounted on the surface of the organic display panel housing (1); A sealing strip (14) is arranged on the upper surface of the organic display panel housing (1), and bolts (15) are screwed to the four corners of the upper surface of the sealing strip (14). A cover plate (16) is installed at the bottom of the organic display panel housing (1), and threaded rods (17) are screwed to the four corners of the bottom of the cover plate (16).

2. The organic display panel according to claim 1, characterized in that: The sealing strip (14) is designed to be circular in shape, and a sealing pad layer is installed on the surface of the sealing strip (14).

3. The organic display panel according to claim 1, characterized in that: A light intensity sensor (11) is installed inside the organic display panel housing (1), and an optical detection device (12) is installed on the surface of the organic display panel housing (1).

4. The organic display panel according to claim 1, characterized in that: The organic light emitting diode unit (8) is of built-in design, and the organic light emitting diode unit (8) is embedded below the pixel electrode unit (6).

5. A method for correcting brightness uniformity of an organic display panel, comprising an organic display panel as claimed in any one of claims 1 to 5, characterized in that: The steps include: S1, starting an initialization program: starting the initialization program through the control panel (13), and obtaining initial brightness distribution data of the organic light emitting diode unit (8) through the brightness detection unit (91); S2, identifying abnormal brightness areas: comparing the initial brightness distribution data with a preset target uniformity threshold to identify abnormal brightness areas, where the abnormality includes local over-brightness or over-darkness; S3, calculating the current compensation amount: based on the brightness deviation value of the abnormal area, calculating the corresponding current compensation amount through the control unit (92); S4, current compensation: using the compensation unit (93) to superimpose the current compensation amount on the corresponding driving signal of the driving circuit layer (7) in real time; S5, dynamically maintaining brightness: periodically executing steps S1-S4 to dynamically maintain brightness uniformity, with the period interval being adaptively adjusted according to the aging rate of the organic light emitting diode unit (8); S6, maintaining uniform brightness, when it is detected that the brightness attenuation of the organic light emitting diode unit (8) exceeds a first threshold, triggering an emergency compensation mode, increasing its driving current and synchronously reducing the current of adjacent units to prevent cross-color effect, when it is detected that the brightness overload of the organic light emitting diode unit (8) exceeds a second threshold, starting a pixel refresh mechanism to reset the threshold voltage of the driving TFT.

6. The method for correcting brightness uniformity of an organic display panel according to claim 5, characterized in that: The compensation unit (93) injects a compensation current into the driving circuit through capacitive coupling, superimposes a compensation voltage in the gamma correction circuit, and indirectly adjusts the driving current.

7. The method for correcting brightness uniformity of an organic display panel according to claim 5, characterized in that: The control panel (13) is connected to an image processor, wherein the image processor pre-stores a color correction matrix.

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