A display panel display testing method and apparatus

Abstract

This invention discloses a display testing method and apparatus for a display panel. The display area of ​​the display panel includes a brightness monitoring area and at least two display areas to be tested. The brightness monitoring area is located on the side of the preset display area to be tested away from the first end of the first power line, or the brightness monitoring area is located within the preset display area to be tested, specifically in the area away from the first end of the first power line. The area of ​​the brightness monitoring area is smaller than a predetermined area. The display testing method includes: driving any one of the display areas to be tested to display a first preset grayscale, simultaneously driving the brightness monitoring area to display a second preset grayscale, while other display areas do not display any image, and acquiring the brightness of the brightness monitoring area; determining the brightness uniformity of the display panel based on the brightness of the brightness monitoring area when each display area to be tested displays the first preset grayscale. This invention can improve the testing speed of the display uniformity of the display panel and reduce equipment complexity.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display testing method and apparatus for a display panel. Background Technology

[0002] With the development of display technology, people have increasingly higher requirements for the display performance of display panels. However, existing display panels have poor display uniformity. Display uniformity testing is required before display panels leave the factory; however, existing testing methods are slow and require complex equipment. Summary of the Invention

[0003] This invention provides a display testing method and apparatus for display panels, which improves the testing speed of display uniformity and reduces equipment complexity.

[0004] According to one aspect of the present invention, a display testing method for a display panel is provided. The display panel includes a display area and a non-display area. The display area includes a brightness monitoring area and at least two display areas to be tested, the at least two display areas to be tested being arranged sequentially along a first direction. The display panel further includes a first power line and a driving chip disposed in the non-display area. The driving chip and the at least two display areas to be tested are distributed along the first direction. A first end of the first power line is connected to the driving chip to receive a first power signal. The first power line extends to the display area and is used to provide a first power signal to the sub-pixels in the at least two display areas to be tested.

[0005] The brightness monitoring area is located on the side of the preset display area to be tested that is far from the first end of the first power line, or the brightness monitoring area is located within the preset display area to be tested, and is located in the area of ​​the preset display area to be tested that is far from the first end of the first power line; the preset display area to be tested is the display area to be tested that is farthest from the first end of the first power line, and the area of ​​the brightness monitoring area is smaller than a set area;

[0006] The display testing method includes:

[0007] Drive any display area under test to display a first preset grayscale, and simultaneously drive the brightness monitoring area to display a second preset grayscale, while other display areas do not display images, and obtain the brightness of the brightness monitoring area;

[0008] The brightness uniformity of the display panel is determined based on the brightness of the brightness monitoring area when the first preset grayscale is displayed in each of the test display areas.

[0009] Optionally, the brightness uniformity of the display panel is determined based on the brightness of the brightness monitoring area when each of the test display areas displays the first preset grayscale, including:

[0010] The brightness uniformity of the display panel is determined by the ratio of the brightness of the brightness monitoring area when each of the display areas to be tested displays the first preset grayscale.

[0011] Optionally, obtaining the brightness of the brightness monitoring area includes:

[0012] The brightness of the brightness monitoring area is obtained using an optical measurement device, wherein the minimum size of the brightness monitoring area is greater than or equal to the maximum size of the brightness acquisition area of ​​the measurement probe of the optical measurement device.

[0013] Optionally, the shape of the brightness monitoring area is the same as the shape of the brightness acquisition area of ​​the measuring probe of the optical measuring device.

[0014] Optionally, the brightness monitoring area is circular in shape.

[0015] Optionally, the non-display area includes a first non-display area; the first non-display area is located on the side of the preset test display area that is far from the first end of the preset test display area, and the distance between the brightness monitoring area and the first non-display area is less than a preset distance.

[0016] Optionally, the brightness monitoring area is adjacent to the first non-display area.

[0017] Optionally, the average brightness of the display area when it displays the first preset grayscale is equal to the average brightness of the brightness monitoring area when it displays the second preset grayscale.

[0018] Optionally, the first preset grayscale and the second preset grayscale satisfy the following formula:

[0019] A*L n1 =L n2 ;

[0020] Where A is the ratio of the area of ​​the display area to the area of ​​the display area, and L n1 L is the brightness corresponding to the first preset gray level n1. n2 The brightness corresponding to the second preset gray level n2.

[0021] Optionally, the first preset gray level is 255, and the first preset gray level and the second preset gray level satisfy the following formula:

[0022] A*L 255 = (n² / 255) 2·2 *L 255 ;

[0023] Among them, L 255 This represents the brightness corresponding to grayscale level 255.

[0024] Optionally, the at least two display areas to be tested are the same size.

[0025] Optionally, the at least two display areas to be tested have the same shape.

[0026] Optionally, the display area includes a first edge and a second edge, which extend along the first direction; along the second direction, different display areas under test are at the same or different distances from the first edge; wherein the first direction and the second direction intersect each other.

[0027] Optionally, each of the display areas to be tested includes a plurality of pixel rows arranged sequentially along a first direction, and each pixel row includes a plurality of sub-pixels arranged sequentially along a second direction.

[0028] Optionally, the number of the display areas to be tested is 3, and the width of each display area to be tested along the second direction is equal to the width of the display area, and the brightness monitoring area is located within the preset display area to be tested.

[0029] Optionally, the display panel includes a first display area to be tested, a second display area to be tested, a third display area to be tested, a fourth display area to be tested, and a fifth display area to be tested. The width of each display area to be tested along the second direction is smaller than the width of the display area. The first display area to be tested, the second display area to be tested, and the third display area to be tested are arranged sequentially along the first direction. The first display area to be tested, the second display area to be tested, and the third display area to be tested are equidistant from the first edge. The fourth display area to be tested and the fifth display area to be tested are located on both sides of the second display area to be tested along the second direction. The brightness monitoring area is located on the side of the preset display area to be tested that is away from the first end of the first power line.

[0030] Optionally, the non-display area further includes a second power line, which is used to provide a second power signal to the sub-pixels in the at least two display areas to be tested;

[0031] Each sub-pixel includes a pixel driving circuit and a light-emitting unit. The power supply terminal of the pixel driving circuit is electrically connected to the first power line, the output terminal of the pixel driving circuit is electrically connected to the first terminal of the light-emitting unit, and the second terminal of the light-emitting unit is electrically connected to the second power line.

[0032] According to another aspect of the present invention, a display testing apparatus for a display panel is provided. The display panel includes a display area and a non-display area. The display area includes a brightness monitoring area and at least two display areas to be tested, the at least two display areas to be tested being arranged sequentially along a first direction. The display panel further includes a first power line and a driving chip disposed in the non-display area. The driving chip and the at least two display areas to be tested are distributed along the first direction. A first end of the first power line is connected to the driving chip to receive a first power signal. The first power line extends to the display area and is used to provide a first power signal to the sub-pixels in the at least two display areas to be tested.

[0033] The brightness monitoring area is located on the side of the preset display area to be tested that is far from the first end of the first power line, or the brightness monitoring area is located within the preset display area to be tested, and is located in the area of ​​the preset display area to be tested that is far from the first end of the first power line; the preset display area to be tested is the display area to be tested that is farthest from the first end of the first power line, and the area of ​​the brightness monitoring area is smaller than a set value.

[0034] The display testing device includes:

[0035] The brightness acquisition module is used to drive any display area to be tested to display a first preset grayscale, and drive the brightness monitoring area to display a second preset grayscale, while other display areas are not displayed, and to acquire the brightness of the brightness monitoring area;

[0036] The uniformity determination module is used to determine the brightness uniformity of the display panel based on the brightness of the brightness monitoring area when each of the display areas to be tested displays the first preset grayscale.

[0037] Optionally, the uniformity determination module is specifically used for:

[0038] The brightness uniformity of the display panel is determined by the ratio of the brightness of the brightness monitoring area when each of the display areas to be tested displays the first preset grayscale.

[0039] Optionally, the brightness acquisition module is specifically used for:

[0040] The brightness of the brightness monitoring area is obtained using an optical measurement device, wherein the minimum size of the brightness monitoring area is greater than or equal to the maximum size of the brightness acquisition area of ​​the measurement probe of the optical measurement device.

[0041] Optionally, the shape of the brightness monitoring area is the same as the shape of the brightness acquisition area of ​​the measuring probe of the optical measuring device.

[0042] Optionally, the brightness monitoring area is circular in shape.

[0043] This invention, in its embodiments, drives any test display area to display a first preset grayscale, simultaneously drives a brightness monitoring area to display a second preset grayscale, while other display areas do not display any image. The brightness of the brightness monitoring area is then acquired. Based on the brightness of the brightness monitoring area when each test display area displays the first preset grayscale, the brightness uniformity of the display panel is determined. Only the brightness of the brightness monitoring area needs to be measured to determine the display panel's uniformity; there is no need to change the measurement position of the brightness measurement device, making the operation simple, the measurement speed fast, and the equipment complexity low. Furthermore, the brightness monitoring area is small in area and has a large equivalent resistance, thus having a minimal impact on the brightness of the test display area. The resistance of the test display area affects the first power supply voltage of the test display area, which in turn affects the first power supply voltage applied to the brightness monitoring area, and consequently, the brightness of the brightness monitoring area. Therefore, the brightness of the brightness monitoring area reflects the first power supply voltage of the brightness monitoring area, the first power supply voltage of the test display area, and the brightness of the test display area. Thus, by measuring the brightness of the brightness monitoring area when each test display area displays the first preset grayscale and the brightness monitoring area displays the second grayscale, the brightness status of the test display area can be determined, thereby confirming the brightness uniformity of the display panel. In summary, the solution of this invention provides fast measurement speed and low equipment complexity while ensuring accurate testing of the brightness uniformity of the display panel.

[0044] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of a display panel;

[0047] Figure 2 This is a schematic diagram of a display panel provided in an embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of another display panel provided in an embodiment of the present invention;

[0049] Figure 4 This is a flowchart of a display panel display testing method provided in an embodiment of the present invention;

[0050] Figure 5 This is a circuit equivalent diagram of a display panel provided in an embodiment of the present invention;

[0051] Figure 6 This is a schematic diagram of another display panel provided in an embodiment of the present invention;

[0052] Figure 7 This is a schematic diagram of another display panel provided in an embodiment of the present invention;

[0053] Figure 8 This is a schematic diagram of another display panel provided in an embodiment of the present invention;

[0054] Figure 9 This is a schematic diagram of another display panel provided in an embodiment of the present invention;

[0055] Figure 10 This is a schematic diagram of a sub-pixel;

[0056] Figure 11 This is a schematic diagram of a display panel testing device provided in an embodiment of the present invention. Detailed Implementation

[0057] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0058] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0059] Figure 1 This is a schematic diagram of a display panel, for reference. Figure 1Each sub-pixel 30 in the display panel requires a first power signal ELVDD to display its image. The first power signal ELVDD is output by the driver chip and transmitted to each sub-pixel 30 through the first power line 50. Since both the first power line 50 and the sub-pixel 30 themselves have resistance, they divide the voltage of the first power signal ELVDD, causing voltage changes during transmission. For example, the voltage of the first power signal ELVDD near the driver chip may be greater than the voltage far from the driver chip, resulting in different brightness levels in different display areas when the display panel displays the same grayscale image, affecting the display uniformity. Existing technology uses a brightness acquisition device to sequentially measure the brightness of different areas of the display panel, which is slow and involves high equipment complexity.

[0060] Based on this, the present invention provides a display testing method for a display panel. Figure 2 This is a schematic diagram of a display panel provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of another display panel provided in an embodiment of the present invention, see reference. Figure 2 and Figure 3 The display panel includes a display area 10 and a non-display area 20. The display area includes a brightness monitoring area 12 and at least two display areas 11 to be tested, which are arranged sequentially along a first direction X. The display panel also includes a first power line 50 and a driver chip for the non-display area 20. The driver chip and the at least two display areas 11 to be tested are distributed along the first direction X. The first end 51 of the first power line 50 is connected to the driver chip to receive a first power signal. The first power line 50 extends to the display area 10 to provide a first power signal to the sub-pixels 30 in the at least two display areas 11 to be tested.

[0061] The brightness monitoring area 12 is located on the side of the preset test display area 111 that is far from the first end 51 of the first power line 50, or the brightness monitoring area 12 is located within the preset test display area 111 and in the area of ​​the preset test display area that is far from the first end 51 of the first power line 50; the preset test display area 111 is the test display area 11 that is farthest from the first end 51 of the first power line 50, and the area of ​​the brightness monitoring area 12 is smaller than the set area.

[0062] For details, please refer to Figure 2-Figure 3The display area 10 of the display panel is used to display the image. The display area may include multiple sub-pixels 30, each sub-pixel 30 including a pixel driving circuit and a light-emitting unit. The pixel driving circuit is used to drive the light-emitting structural unit. The non-display area 20 does not display the image and surrounds the display area 10. The first power line 50 is used to provide a first power signal to the pixel driving circuit of the sub-pixel 30. The display panel may include two or more display areas 11 to be tested. The different display areas 11 to be tested may be the same size and may have the same or different shapes. The first power signal is input to the first power line 50 from the first end 51 and transmitted along the first power line 50. The set area can be determined according to the area of ​​the brightness acquisition probe of the brightness acquisition device. For example, the area size of the brightness monitoring area 12 can be close to the size of the near light aperture of the brightness acquisition device. When the brightness monitoring area 12 is located within the preset test display area 111 and is located at the first end 51 of the preset test display area away from the first power line 50, the brightness monitoring area 12 can be adjacent to the edge of the preset test display area 111 away from the first power line 50.

[0063] Figure 4 This is a flowchart of a display panel display testing method provided in an embodiment of the present invention, see reference. Figure 4 The test methods include:

[0064] S110: Drive any display area to be tested to display the first preset grayscale, and simultaneously drive the brightness monitoring area to display the second preset grayscale, while other display areas do not display images, and obtain the brightness of the brightness monitoring area.

[0065] For details, please refer to Figure 2 and Figure 3 Each time, one test display area 11 and one brightness monitoring area 12 are simultaneously driven to display an image. The test display area 11 displays a first preset grayscale, and the brightness monitoring area 12 displays a second preset grayscale. Other test display areas 11 do not display an image, and the brightness of the brightness monitoring area 12 is obtained. This process is repeated to obtain the brightness of each test display area 11 when it displays the first preset grayscale and the brightness monitoring area 12 when it displays the second preset grayscale. For example, the first test display area can be driven to display the first preset grayscale and the brightness monitoring area 12 can be driven to display the second preset grayscale, and the brightness of the brightness monitoring area 12 can be obtained. Then, the second test display area can be driven to display the first preset grayscale and the brightness monitoring area 12 can be driven to display the second preset grayscale, and the brightness of the brightness monitoring area 12 can be obtained. This process continues until the nth test display area is driven to display the first preset grayscale and the brightness monitoring area 12 is driven to display the second preset grayscale, and the brightness of the brightness monitoring area 12 is obtained.

[0066] Furthermore, the first preset grayscale can be set according to testing needs; for example, the first preset grayscale can be 255 grayscale levels. The second preset grayscale can be determined according to the display characteristics of the display panel, ensuring that when the brightness monitoring area 12 displays the second preset grayscale, it can reflect the brightness of the display area 11 under test when it displays the first preset grayscale. For example, the second preset grayscale can be set according to the area of ​​the display area 11 under test, the area of ​​the brightness monitoring area 12, and the first preset grayscale. For instance, the average brightness of the brightness monitoring area 12 when displaying the second preset grayscale can be set to be equal to the average brightness of the display area 11 under test when displaying the first preset grayscale.

[0067] S120. Determine the brightness uniformity of the display panel based on the brightness of the brightness monitoring area when each display area to be tested displays the first preset grayscale.

[0068] Specifically, Figure 5 This is a circuit equivalent diagram of a display panel provided in an embodiment of the present invention, for reference. Figures 2-5 When the brightness monitoring area 12 is located at the first end 51 of the preset test display area 111, which is far from the first power line 50, the test display area 11 and the brightness monitoring area 12 are connected in parallel when displaying images. For example, the display panel includes three test display areas 11, arranged sequentially along the first direction X. The equivalent resistance of the first test display area is R11, the equivalent resistance of the second test display area is R12, and the equivalent resistance of the third test display area is R13. When one test display area 11 displays an image while the other test display areas 11 do not display an image, the test display area 11 displaying the image and the brightness monitoring area 12 are connected in parallel.

[0069] When the brightness monitoring area 12 is located within the preset test display area 111 and in the area of ​​the preset test display area that is far from the first end 51 of the first power line 50, when the other test display areas 11 besides the preset test display area 111 display the image, they are connected in parallel with the brightness monitoring area 12. When the preset test display area 111 displays the image, the sub-pixels in the preset test display area 111 that are in the same row as the brightness monitoring area 12 are connected in series with the brightness monitoring area 12, and the other sub-pixels are connected in parallel with the brightness monitoring area 12. Since the area of ​​the brightness monitoring area 12 is small, there are fewer sub-pixels in the preset test display area 111 that are connected in series with the brightness monitoring area 12, which can be equivalent to the brightness monitoring area 12 and the preset test display area 111 being connected in parallel.

[0070] The smaller the display area, the larger the equivalent parallel resistance. Since the area of ​​the brightness monitoring area 12 is smaller than the set area, and much smaller than the area of ​​the display area 11 under test, the equivalent resistance of the brightness monitoring area 12 is much greater than the resistance of the display area 11 under test. Therefore, the resistance of the brightness monitoring area 12 has a relatively small impact on the voltage division of the display area 11 under test, and thus a relatively small impact on the brightness of the display area 11 under test. The resistance of the display area 11 under test affects the first power supply voltage of the display area 11 under test, and consequently, the first power supply voltage applied to the brightness monitoring area 12, thus affecting the brightness of the brightness monitoring area 12. Therefore, the brightness of the brightness monitoring area 12 can reflect the first power supply voltage of the brightness monitoring area 12, the first power supply voltage of the display area 11 under test, and the brightness of the display area 11 under test. Thus, by measuring the brightness of each display area 11 under test displaying the first preset grayscale and the brightness monitoring area 12 displaying the second grayscale, the brightness of the brightness monitoring area 12 can determine the brightness status of the display area 11 under test, thereby determining the brightness uniformity of the display panel.

[0071] For example, the ratio of the brightness of the brightness monitoring area 12 corresponding to different display areas to be tested can be calculated, and the brightness uniformity of the display panel can be determined based on the ratio.

[0072] This invention, in its embodiment, drives any test display area to display a first preset grayscale, simultaneously drives the brightness monitoring area to display a second preset grayscale, while other display areas do not display any image. The brightness of the brightness monitoring area is then acquired. Based on the brightness of the brightness monitoring area when each test display area displays the first preset grayscale, the brightness uniformity of the display panel is determined. Only the brightness of the brightness monitoring area needs to be measured to determine the display panel's uniformity; there is no need to change the measurement position of the brightness measurement device. This method is simple to operate, fast, and has low equipment complexity. Furthermore, the brightness monitoring area 12 has a small area and a large equivalent resistance, thus having minimal impact on the brightness of the test display area 11. The resistance of the display area 11 under test affects the first power supply voltage of the display area 11, which in turn affects the first power supply voltage applied to the brightness monitoring area 12, thus affecting the brightness of the brightness monitoring area 12. Therefore, the brightness of the brightness monitoring area 12 reflects the first power supply voltage of the brightness monitoring area 12, the first power supply voltage of the display area 11 under test, and the brightness of the display area 11 under test. Thus, by measuring the brightness of each display area 11 under test when it displays a first preset grayscale and the brightness monitoring area 12 displays a second grayscale, the brightness of the brightness monitoring area 12 can determine the brightness status of the display area 11 under test, thereby determining the brightness uniformity of the display panel. In summary, the solution of this embodiment of the invention, while ensuring accurate testing of the brightness uniformity of the display panel, offers fast measurement speed and low equipment complexity.

[0073] Optionally, the brightness uniformity of the display panel is determined based on the brightness of the brightness monitoring area when each display area to be tested displays the first preset grayscale, including:

[0074] The brightness uniformity of the display panel is determined by the ratio of the brightness of the brightness monitoring area when each display area displays the first preset grayscale.

[0075] Specifically, since the brightness of the brightness monitoring area 12 can reflect the brightness of the display area 11 under test, the ratio of the brightness of the brightness monitoring area 12 when each display area 11 under test displays the first preset gray level can reflect the ratio of the brightness of each display area 11 under test, thereby reflecting the brightness uniformity of the display panel. Moreover, the calculation of the ratio of the brightness of the brightness monitoring area 12 when each display area 11 under test displays the first preset gray level is fast, which can further improve the measurement speed of display uniformity.

[0076] For example, the brightness uniformity of the display panel can be determined by the ratio of the brightness of the brightness monitoring area 12 when the first test display area displays the first preset grayscale and the brightness monitoring area displays the second preset grayscale, to the brightness of the brightness monitoring area 12 when the second test display area displays the first preset grayscale and the brightness monitoring area displays the second preset grayscale, ... to the brightness of the brightness monitoring area 12 when the nth test display area displays the first preset grayscale and the brightness monitoring area displays the second preset grayscale. Here, n is an integer greater than or equal to 2.

[0077] Based on the above embodiments, optionally, obtaining the brightness of the brightness monitoring area includes:

[0078] The brightness of the brightness monitoring area is obtained using optical measurement equipment, wherein the minimum size of the brightness monitoring area is greater than or equal to the maximum size of the brightness acquisition area of ​​the measurement probe of the optical measurement equipment.

[0079] The optical measurement equipment can be a color analyzer or a spectroradiometer, or other optical measurement equipment capable of acquiring brightness. The size of the brightness acquisition area of ​​the measurement probe of the optical measurement equipment is the size of the near-light aperture of the optical measurement equipment. The minimum size of the brightness monitoring area is greater than or equal to the maximum size of the brightness acquisition area of ​​the measurement probe of the optical measurement equipment, which can be greater than or equal to the size of the near-light aperture of the optical measurement equipment.

[0080] Specifically, the minimum size of the brightness monitoring area is set to be greater than or equal to the maximum size of the brightness acquisition area of ​​the measuring probe of the optical measuring device. When measuring the brightness of the brightness monitoring area, the projection of the measuring probe on the brightness monitoring area is located within the brightness monitoring area, so that the measuring probe can accurately measure the brightness of the brightness monitoring area.

[0081] Based on the above embodiments, optionally, the minimum size of the brightness monitoring area is greater than or equal to 4mm and less than or equal to 20mm.

[0082] Specifically, if the size of the brightness monitoring area is too small, the size requirements for the measurement probe of the optical measurement equipment are too high, which is not conducive to cost reduction. If the size of the brightness monitoring area is too large, it may affect the brightness of the display area under test, thus affecting the measurement accuracy. By setting the minimum size of the brightness monitoring area to be greater than or equal to 4mm and less than or equal to 20mm, the brightness monitoring area is kept small enough not to affect the brightness of the display area under test, and the brightness of the monitoring area can better reflect the brightness of the display area under test. This improves the measurement accuracy of display uniformity while reducing the size requirements for the measurement probe of the optical measurement equipment, thereby reducing costs.

[0083] Based on the above embodiments, optionally, the shape of the brightness monitoring area is the same as the shape of the brightness acquisition area of ​​the measurement probe of the optical device.

[0084] This design allows for a smaller brightness monitoring area, ensuring that the monitoring area does not affect the brightness of the display area under test, and that the brightness of the monitoring area can better reflect the brightness of the display area under test, thereby improving the accuracy of display uniformity measurement.

[0085] Optionally, based on the above embodiments, the shape of the brightness monitoring area is circular.

[0086] Specifically, the near-light aperture of the measuring probe in optical measuring equipment is circular.

[0087] Based on the above embodiments, optionally, refer to Figure 2 and Figure 3 The non-display area 20 includes a first non-display area 21; the first non-display area 21 is located on the side of the preset test display area 111 away from the first end of the first power line, and the distance between the brightness monitoring area 12 and the first non-display area 21 is less than a preset distance.

[0088] Among them, reference Figure 2 The first non-display area 21 is adjacent to the preset display area to be tested 111. When the brightness monitoring area 12 is located within the preset display area to be tested 111, the closer the brightness monitoring area 12 is to the first non-display area 21, the smaller the voltage drop effect of the brightness monitoring area 12 on the preset display area to be tested 111, and the smaller the impact on the brightness of the preset display area to be tested 111. By setting the distance between the brightness monitoring area 12 and the first non-display area 21 to be less than a preset distance, the impact of the brightness monitoring area 12 on the brightness of the preset display area to be tested 111 is minimized, thereby improving the accuracy of the display uniformity test results.

[0089] refer to Figure 3When the brightness monitoring area 12 is located on the side of the preset test display area 111 that is far away from the first end 51 of the first power line 50, the closer the brightness monitoring area 12 is to the first non-display area 21, the smaller the area of ​​the display area 10 between the brightness monitoring area 12 and the first non-display area 21, the larger the area ratio of all test display areas 11 to the display area 10, and the larger the test area of ​​the display area 10, the better the display uniformity of the display panel can be tested.

[0090] For example, the preset distance can be a few millimeters, such as 5 millimeters.

[0091] Based on the above embodiments, optionally, the brightness monitoring area 12 is adjacent to the first non-display area 21.

[0092] For details, please refer to Figure 2 When the brightness monitoring area 12 is located within the preset display area to be tested 111, and when the brightness monitoring area 12 is adjacent to the first non-display area 21, the influence of the brightness monitoring area 12 on the voltage division of the preset display area to be tested 111 is minimal, further improving the accuracy of the display uniformity test results.

[0093] refer to Figure 3 When the brightness monitoring area 12 is located on the side of the preset test display area 111 away from the first end 51 of the first power line 50, and when the brightness monitoring area 12 is adjacent to the first non-display area 21, the area ratio of all test display areas 11 to display area 10 is the largest, the test area of ​​display area 10 is the largest, and the display uniformity of the display panel can be better tested.

[0094] Based on the above embodiments, optionally, the average brightness of the display area 11 when displaying the first preset grayscale is equal to the average brightness of the brightness monitoring area 12 when displaying the second preset grayscale.

[0095] With this configuration, the brightness per unit area of ​​the brightness monitoring area 12 is consistent with that of the display area 11 under test, and the brightness change of the brightness monitoring area 12 is consistent with the brightness change of the display area 11 under test. The brightness of the brightness monitoring area 12 can more accurately reflect the brightness of the display area 11 under test, thereby improving the accuracy of the display uniformity test of the display panel.

[0096] Based on the above embodiments, optionally, the first preset grayscale and the second preset grayscale satisfy the following formula:

[0097] A*L n1 =L n2 ;

[0098] Where A is the ratio of the area of ​​the display area to the area of ​​the display area, and L n1 L is the brightness corresponding to the first preset gray level n1. n2 The brightness corresponding to the second preset gray level n2.

[0099] That is, A * display area * L n1 = Brightness at grayscale level of 100% display area * n2.

[0100] Based on the above embodiments, optionally, the first preset grayscale is 255, and the first preset grayscale and the second preset grayscale satisfy the following formula:

[0101] A*L 255 = (n² / 255) 2·2 *L 255 ;

[0102] Among them, L 255 This represents the brightness corresponding to grayscale level 255.

[0103] For example, if the area of ​​the display area 11 to be tested is 1 / 3 of the area of ​​the display area 10, then A = 1 / 3 and n2 = 148 gray levels. If the area of ​​the display area 11 to be tested is 1 / 10 of the area of ​​the display area 10, then A = 1 / 10 and n2 = 90 gray levels.

[0104] Based on the above embodiments, optionally, at least two display areas 11 to be tested are the same size and have the same shape.

[0105] This setting can reduce the difficulty of driving the display area 11 under test and improve the testing speed.

[0106] Figure 6 This is a schematic diagram of another display panel provided in an embodiment of the present invention. Figure 7 This is a schematic diagram of another display panel provided in an embodiment of the present invention. Optionally, based on the above embodiments, refer to... Figure 2 , Figure 3 , Figure 6 and Figure 7 The display area 10 includes a first edge 101 and a second edge 102, which extend along a first direction X; along a second direction Y, the distances between different display areas 11 to be tested and the first edge 101 are the same or different; wherein the first direction X and the second direction Y intersect each other.

[0107] Wherein, the first direction X can be the length direction of the display panel, and the second direction Y can be the width direction of the display panel. The width of the display area 11 under test along the first direction X can be less than or equal to the width of the display area 10 along the first direction X. (Reference) Figure 6 and Figure 7 When the width of the display area 11 under test along the second direction Y is less than the width of the display area 10 along the second direction Y, the distance between different display areas 11 under test and the first edge 101 can be different. Figure 6Alternatively, the distances between different display areas 11 to be tested and the first edge 101 can also be the same. Figure 7 ).

[0108] Specifically, the position and size of the display area 11 to be tested can be set as needed, and this embodiment does not impose any specific limitations. This embodiment can meet different testing requirements by setting the distance between different display areas 11 to be tested and the first edge 101 along the second direction Y to be the same or different.

[0109] Based on the above embodiments, optionally, each display area 11 to be tested includes a plurality of pixel rows 310 arranged sequentially along the first direction X, and each pixel row 310 includes a plurality of sub-pixels 30 arranged sequentially along the second direction Y.

[0110] Specifically, the width of each test display area 11 along the second direction Y is equal to the width of the display area 10. The inventors discovered through experiments that when the width of each test display area 11 along the second direction Y is equal to the width of the display area 10, compared to determining display uniformity by measuring the brightness of each test display area 11 separately using optical measuring equipment, the measurement error of the scheme in this embodiment is within 1%.

[0111] Based on the above embodiments, optionally, refer to the following: Figure 2 There are 3 display areas 11 to be tested. The width of each display area 11 along the second direction Y is equal to the width of the display area 10. The brightness monitoring area 12 is located within the preset display area 111 to be tested.

[0112] or, Figure 8 This is a schematic diagram of another display panel provided in an embodiment of the present invention. Figure 9 This is a schematic diagram of another display panel provided in an embodiment of the present invention, see reference. Figure 8 and Figure 9 The display panel includes a first test display area 1101, a second test display area 1102, a third test display area 1103, a fourth test display area 1104, and a fifth test display area 1105. The width of each test display area along the second direction Y is less than the width of the display area 10. The first test display area 1101, the second test display area 1102, and the third test display area 1103 are arranged sequentially along the first direction X. The first test display area 1101, the second test display area 1102, and the third test display area 1103 are equidistant from the first edge 101. The fourth test display area 1104 and the fifth test display area 1105 are located on both sides of the second test display area 1102 along the second direction Y. The brightness monitoring area 111 is located on the side of the preset test display area 111 away from the first end of the first power line 50.

[0113] For details, please refer to Figure 2The three test display areas 11 have equal lengths along the first direction X, and the area of ​​each test display area 11 can be 30% of the area of ​​the display area 10. The inventors discovered through experiments that by sequentially lighting... Figure 2 The test display area 11 and brightness monitoring area 12 shown in the figure measure the uniformity of the display panel. Compared with determining the display uniformity by measuring the brightness of each test display area 11 separately by optical measurement equipment, the measurement error of the scheme in this embodiment is within 1%.

[0114] refer to Figure 8 and Figure 9 The distances between each of the first, second, and third test display areas 1101, 1102, and 1103 and the first and second edges 101 and 102 can be equal. The fourth and fifth test display areas 1104 and 1105 can overlap with the second test display area 1102. Figure 9 ) can also be non-overlapping ( Figure 8 The areas of the first test display area 1101, the second test display area 1102, the third test display area 1103, the fourth test display area 1104, and the fifth test display area 1105 can each be 10% of the area of ​​the display area 10.

[0115] The first test display area 1101, the second test display area 1102, the third test display area 1103, the fourth test display area 1104, and the fifth test display area 1105 are located at the top, middle, bottom, left, and right of the display area 10, respectively, which allows for more accurate measurement of display uniformity. The inventors discovered through experiments that by sequentially lighting up… Figure 8 and Figure 9 The uniformity measurement of the display panel is performed by the test display area and the brightness monitoring area 12 shown. Compared with the method of measuring the brightness of each test display area 11 separately by optical measurement equipment to determine the display uniformity, the measurement error of the scheme in this embodiment is within 1%.

[0116] Optional, see reference Figure 9 The non-display area 20 also includes a second power line 60, which is used to provide a second power signal ELVSS to at least two sub-pixels in the display area 11 under test.

[0117] Figure 10 This is a schematic diagram of a sub-pixel, see reference. Figure 10 Each sub-pixel 30 includes a pixel driving circuit 301 and a light-emitting unit 302. The power supply terminal of the pixel driving circuit 301 is electrically connected to the first power line 50, the output terminal of the pixel driving circuit 301 is electrically connected to the first terminal of the light-emitting unit 302, and the second terminal of the light-emitting unit 302 is electrically connected to the second power line 60.

[0118] Specifically, the second power line 60 is electrically connected to the driver chip. The pixel driving circuit 301 may include at least two transistors and at least one capacitor; for example, the pixel driving circuit 301 includes seven transistors and one capacitor. The light-emitting unit 302 may be an organic light-emitting diode, etc.

[0119] This invention also provides a display testing device for a display panel. The display panel includes a display area and a non-display area. The display area includes a brightness monitoring area and at least two display areas to be tested, which are arranged sequentially along a first direction. The display panel also includes a first power line and a driving chip disposed in the non-display area. The driving chip and the at least two display areas to be tested are distributed along the first direction. A first end of the first power line is connected to the driving chip to receive a first power signal. The first power line extends to the display area and is used to provide a first power signal to the sub-pixels in the at least two display areas to be tested.

[0120] The brightness monitoring area is located on the side of the preset display area to be tested that is far from the first end of the first power line, or the brightness monitoring area is located within the preset display area to be tested, and is located in the area of ​​the preset display area to be tested that is far from the first end of the first power line; the preset display area to be tested is the display area to be tested that is farthest from the first end of the first power line, and the area of ​​the brightness monitoring area is smaller than a set value.

[0121] Figure 11 This is a schematic diagram of a display panel testing device provided in an embodiment of the present invention, with reference to... Figure 11 The display testing device includes:

[0122] The brightness acquisition module 210 is used to drive any display area to be tested to display a first preset grayscale, and drive the brightness monitoring area to display a second preset grayscale, while other display areas are not displayed, and to acquire the brightness of the brightness monitoring area;

[0123] The uniformity determination module 220 is used to determine the brightness uniformity of the display panel based on the brightness of the brightness monitoring area when each of the display areas to be tested displays the first preset grayscale.

[0124] Optionally, the uniformity determination module 220 is specifically used for:

[0125] The brightness uniformity of the display panel is determined by the ratio of the brightness of the brightness monitoring area when each of the display areas to be tested displays the first preset grayscale.

[0126] Optionally, the brightness acquisition module 210 is specifically used for:

[0127] The brightness of the brightness monitoring area is obtained using an optical measurement device, wherein the minimum size of the brightness monitoring area is greater than or equal to the maximum size of the brightness acquisition area of ​​the measurement probe of the optical measurement device;

[0128] Optionally, the minimum size of the brightness monitoring area is greater than or equal to 4 mm and less than or equal to 20 mm;

[0129] Optionally, the shape of the brightness monitoring area is the same as the shape of the brightness acquisition area of ​​the measuring probe of the optical measuring device;

[0130] Optionally, the brightness monitoring area is circular in shape.

[0131] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0132] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A display testing method for a display panel, characterized in that: The display panel includes a display area and a non-display area. The display area includes a brightness monitoring area and at least two display areas to be tested, which are arranged sequentially along a first direction. The display panel also includes a first power line and a driver chip disposed in the non-display area. The driver chip and the at least two display areas to be tested are distributed along the first direction. A first end of the first power line is connected to the driver chip to receive a first power signal. The first power line extends to the display area and is used to provide a first power signal to the sub-pixels in the at least two display areas to be tested. The brightness monitoring area is located on the side of the preset display area to be tested that is far from the first end of the first power line, or the brightness monitoring area is located within the preset display area to be tested, and is located in the area of ​​the preset display area to be tested that is far from the first end of the first power line; the preset display area to be tested is the display area to be tested that is farthest from the first end of the first power line, and the area of ​​the brightness monitoring area is smaller than a set area; The display testing method includes: Drive any display area under test to display a first preset grayscale, and simultaneously drive the brightness monitoring area to display a second preset grayscale, while other display areas do not display images, and obtain the brightness of the brightness monitoring area; The brightness uniformity of the display panel is determined based on the brightness of the brightness monitoring area when the first preset grayscale is displayed in each of the display areas to be tested. The brightness uniformity of the display panel is determined based on the brightness of the brightness monitoring area when each of the test display areas displays the first preset grayscale, including: The brightness uniformity of the display panel is determined by the ratio of the brightness of the brightness monitoring area when each of the display areas to be tested displays the first preset grayscale.

2. The display testing method according to claim 1, characterized in that, Obtaining the brightness of the brightness monitoring area includes: The brightness of the brightness monitoring area is obtained using an optical measurement device, wherein the minimum size of the brightness monitoring area is greater than or equal to the maximum size of the brightness acquisition area of ​​the measurement probe of the optical measurement device.

3. The display testing method according to claim 2, characterized in that, The shape of the brightness monitoring area is the same as the shape of the brightness acquisition area of ​​the measuring probe of the optical measuring device.

4. The display testing method according to claim 2, characterized in that, The brightness monitoring area is circular in shape.

5. The display testing method according to claim 1, characterized in that: The non-display area includes a first non-display area; the first non-display area is located on the side of the preset display area to be tested away from the first end of the first power line, and the distance between the brightness monitoring area and the first non-display area is less than a preset distance.

6. The display testing method according to claim 5, characterized in that, The brightness monitoring area is adjacent to the first non-display area.

7. The display testing method according to claim 1, characterized in that: The average brightness of the display area when it displays the first preset grayscale is equal to the average brightness of the brightness monitoring area when it displays the second preset grayscale.

8. The display testing method according to claim 7, characterized in that, The first preset grayscale and the second preset grayscale satisfy the following formula: A*L n1 =L n2 ; Where A is the ratio of the area of ​​the display area to the area of ​​the display area, and L n1 L is the brightness corresponding to the first preset gray level n1. n2 The brightness corresponding to the second preset gray level n2.

9. The display testing method according to claim 8, characterized in that, The first preset gray level is 255, and the first preset gray level and the second preset gray level satisfy the following formula: A*L 255 =(n2 / 255) 2·2 *L 255 ; Among them, L 255 This represents the brightness corresponding to grayscale level 255.

10. The display testing method according to claim 1, characterized in that: The at least two display areas to be tested are the same size.

11. The display testing method according to claim 10, characterized in that, The at least two display areas to be tested have the same shape.

12. The display testing method according to claim 1, characterized in that, The display area includes a first edge and a second edge, which extend along the first direction; along the second direction, the distances between different display areas under test and the first edge may be the same or different; wherein the first direction and the second direction intersect each other.

13. The display testing method according to claim 12, characterized in that, Each of the display areas to be tested includes multiple rows of pixels arranged sequentially along a first direction, and each row of pixels includes multiple sub-pixels arranged sequentially along a second direction.

14. The display testing method according to claim 12, characterized in that: The number of the display areas to be tested is 3, and the width of each display area to be tested along the second direction is equal to the width of the display area. The brightness monitoring area is located within the preset display area to be tested. Alternatively, the display panel includes a first display area to be tested, a second display area to be tested, a third display area to be tested, a fourth display area to be tested, and a fifth display area to be tested. The width of each display area to be tested along the second direction is less than the width of the display area. The first display area to be tested, the second display area to be tested, and the third display area to be tested are arranged sequentially along the first direction. The first display area to be tested, the second display area to be tested, and the third display area to be tested are equidistant from the first edge. The fourth display area to be tested and the fifth display area to be tested are located on both sides of the second display area to be tested along the second direction. The brightness monitoring area is located on the side of the preset display area to be tested that is away from the first end of the first power line.

15. A display panel testing device, characterized in that: The display panel includes a display area and a non-display area. The display area includes a brightness monitoring area and at least two display areas to be tested, which are arranged sequentially along a first direction. The display panel also includes a first power line and a driver chip disposed in the non-display area. The driver chip and the at least two display areas to be tested are distributed along the first direction. A first end of the first power line is connected to the driver chip to receive a first power signal. The first power line extends to the display area and is used to provide a first power signal to the sub-pixels in the at least two display areas to be tested. The brightness monitoring area is located on the side of the preset display area to be tested that is far from the first end of the first power line, or the brightness monitoring area is located within the preset display area to be tested, and is located in the area of ​​the preset display area to be tested that is far from the first end of the first power line; the preset display area to be tested is the display area to be tested that is farthest from the first end of the first power line, and the area of ​​the brightness monitoring area is smaller than a set value. The display testing device includes: The brightness acquisition module is used to drive any display area to be tested to display a first preset grayscale, and drive the brightness monitoring area to display a second preset grayscale, while other display areas are not displayed, and to acquire the brightness of the brightness monitoring area; The uniformity determination module is used to determine the brightness uniformity of the display panel based on the brightness of the brightness monitoring area when each of the test display areas displays the first preset grayscale; specifically, the uniformity determination module is used to determine the brightness uniformity of the display panel based on the ratio of the brightness of the brightness monitoring area when each of the test display areas displays the first preset grayscale.

16. The display testing apparatus according to claim 15, characterized in that, The brightness acquisition module is specifically used for: The brightness of the brightness monitoring area is obtained using an optical measurement device, wherein the minimum size of the brightness monitoring area is greater than or equal to the maximum size of the brightness acquisition area of ​​the measurement probe of the optical measurement device.

17. The display testing apparatus according to claim 16, characterized in that, The shape of the brightness monitoring area is the same as the shape of the brightness acquisition area of ​​the measuring probe of the optical measuring device.

18. The display testing apparatus according to claim 16, characterized in that, The brightness monitoring area is circular in shape.

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