Display panel and display device

Abstract

The present application discloses a display panel and a display device. The display panel includes: a substrate; a light-emitting device layer, located on one side of the substrate, including a plurality of light-emitting elements, the plurality of light-emitting elements including a first light-emitting element and a second light-emitting element with inconsistent light emission colors; a compensation layer, located between the light-emitting device layer and the substrate, including a plurality of compensation units, the orthographic projection of the compensation unit at least partially overlaps with the orthographic projection of the anode of the light-emitting element; the compensation capacitance formed between the anode of the light-emitting element and the compensation unit has a correlation with the orthographic projection overlapping area; the orthographic projection overlapping area of ​​the anode of the first light-emitting element and the first compensation unit is S1, and the orthographic projection overlapping area of ​​the anode of the second light-emitting element and the second compensation unit is S2; S1≠S2. According to the embodiment of the present application, the capacitance difference between light-emitting elements of different light emission colors can be adjusted, so that the brightness difference of light-emitting elements of different colors at low grayscale is reduced, and the color cast problem at low grayscale is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] Currently, display panels typically consist of multiple light-emitting sub-pixels arranged in an array. These sub-pixels are composed of pixel circuits and light-emitting elements. The pixel circuits are typically composed of thin-film transistors (TFTs) and capacitors. The light-emitting elements can typically include organic light-emitting diodes (OLEDs) or other light-emitting devices.

[0003] When the display panel displays low grayscale, the different luminescent materials of the sub-pixels with different light-emitting colors lead to different capacitances in the light-emitting elements. These capacitance differences result in different charging times for the sub-pixels with different light-emitting colors, causing color casts at low grayscale. Summary of the Invention

[0004] Embodiments of the present application provide a display panel and a display device, which can solve the technical problem of low grayscale color cast of the display panel.

[0005] In a first aspect, an embodiment of the present application provides a display panel, the display panel comprising:

[0006] substrate;

[0007] a light-emitting device layer located on one side of the substrate, the light-emitting device layer including a plurality of light-emitting elements, the light-emitting elements including an anode, a light-emitting layer, and a cathode stacked in sequence along the thickness direction of the display panel, the plurality of light-emitting elements including a first light-emitting element and a second light-emitting element, wherein the light emitting color of the first light-emitting element is different from the light emitting color of the second light-emitting element;

[0008] a compensation layer, located between the light-emitting device layer and the substrate, comprising a plurality of compensation units, wherein the orthographic projections of the compensation units on the substrate at least partially overlap with the orthographic projections of the anodes of the light-emitting elements on the substrate, and the plurality of compensation units include a first compensation unit and a second compensation unit;

[0009] The compensation capacitance formed between the anode of the light-emitting element and the compensation unit is correlated with the orthographic projection overlapping area; the orthographic projection overlapping area between the anode of the first light-emitting element and the first compensation unit is S1, and the orthographic projection overlapping area between the anode of the second light-emitting element and the second compensation unit is S2; wherein S1≠S2.

[0010] In a second aspect, an embodiment of the present application provides a display device, which includes the display panel in the above embodiment.

[0011] Compared with the prior art, the display panel and display device provided in the embodiments of the present application, by providing a compensation unit between the anode of the light-emitting element and the substrate, partially overlap the orthographic projection of the compensation unit and the anode of the light-emitting element on the substrate. The light emission color of the first light-emitting element is different from the light emission color of the second light-emitting element, and the orthographic overlap area between the first compensation unit and the anode of the first light-emitting element is different from the orthographic overlap area between the second compensation unit and the anode of the second light-emitting element. For light-emitting elements with different light emission colors, compensation units with different overlap areas can be provided. Due to the difference in the orthographic overlap area, the size of the compensation capacitance formed between the compensation unit and the anode of the light-emitting element is also different, thereby performing different capacitance compensation for light-emitting elements with different light emission colors. By using different compensation units to perform capacitance compensation for light-emitting elements with different light emission colors, the capacitance difference between light-emitting elements with different light emission colors can be adjusted. When reducing the capacitance difference between light-emitting elements with different light emission colors, the brightness difference of light-emitting elements of different colors at low grayscale can be reduced, thereby improving the color cast problem at low grayscale. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 is a schematic cross-sectional structural diagram of a display panel provided in one embodiment of the present application;

[0014] Figure 2 This is a structural diagram of a light-emitting element and a compensation unit provided in one embodiment of the present application;

[0015] Figure 3 is a structural diagram of a light-emitting element and a compensation unit provided in another embodiment of the present application;

[0016] Figure 4 1 is a structural diagram of a light-emitting element and a compensation unit provided in another embodiment of the present application;

[0017] Figure 5 is a structural diagram of a light-emitting element and a compensation unit provided in yet another embodiment of the present application;

[0018] Figure 6 is a schematic cross-sectional structural diagram of a display panel provided in another embodiment of the present application;

[0019] Figure 7This is a schematic diagram of the structure of the signal routing provided by an embodiment of the present application;

[0020] Figure 8 is a structural diagram of a signal routing provided by another embodiment of the present application;

[0021] Figure 9 2 is a schematic structural diagram of a display device provided in one embodiment of the present application.

[0022] In the attached figure:

[0023] 10. Substrate; 20. Light-emitting device layer; 30. Compensation layer; 40. Light-emitting element; 41. Anode; 42. Light-emitting layer; 43. Cathode; 50. Compensation unit; 60. Pixel circuit layer; L. Signal trace. DETAILED DESCRIPTION

[0024] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0025] It should be noted that, in this document, relational terms such as first and second, etc., are used only 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 terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.

[0027] Currently, display panels typically consist of multiple light-emitting sub-pixels arranged in an array. These sub-pixels are composed of pixel circuits and light-emitting elements. The pixel circuits are typically composed of thin-film transistors (TFTs) and capacitors. The light-emitting elements can typically include organic light-emitting diodes (OLEDs) or other light-emitting devices.

[0028] When the display panel displays low grayscale images, the different luminescent materials used in the sub-pixels of different light-emitting colors lead to differences in the capacitance between the anode and cathode of the light-emitting element. Due to these differences in capacitance, the charging time of the sub-pixels of different light-emitting colors varies, resulting in different actual brightness of the sub-pixels of different colors within the low grayscale light frame, causing color cast at low grayscale.

[0029] In order to solve the above technical problems, the embodiments of the present application provide a display panel and a display device. The display panel provided by the embodiments of the present application is first introduced below.

[0030] Figure 1 The structure diagram of a display panel provided by an embodiment of the present application is shown in FIG. The display panel includes a substrate 10 , a light emitting device layer 20 and a compensation layer 30 .

[0031] The light emitting device layer 20 is located on one side of the substrate 10 and includes a plurality of light emitting elements 40 . The light emitting element 40 includes an anode 41 , a light emitting layer 42 and a cathode 43 stacked in sequence along the thickness direction of the display panel.

[0032] The plurality of light emitting elements 40 may include a first light emitting element and a second light emitting element, and the light emitting color of the first light emitting element is different from the light emitting color of the second light emitting element.

[0033] The compensation layer 30 is located between the light-emitting device layer 20 and the substrate 10. The compensation layer 30 includes a plurality of compensation units 50. The orthographic projections of the compensation units 50 on the substrate 10 at least partially overlap with the orthographic projections of the anodes 41 of the light-emitting elements 40 on the substrate 10. The orthographic projections of the compensation units 50 refer to the projections of the compensation units 50 on the substrate 10 along the thickness of the display panel. The orthographic projections of the anodes 41 of the light-emitting elements 40 on the substrate 10 refer to the projections of the anodes 41 of the light-emitting elements 40 on the substrate 10 along the thickness of the display panel.

[0034] A compensation capacitor is formed between the anode 41 of the light-emitting element 40 and the compensation unit 50. The capacitance of the compensation capacitor is correlated with the orthographic projection overlap area. The orthographic projection overlap area is the overlapping area between the orthographic projection of the anode 41 of the light-emitting element 40 on the substrate 10 and the orthographic projection of the compensation unit 50 on the substrate 10.

[0035] The plurality of compensation units 50 include a first compensation unit and a second compensation unit. The compensation unit 50 partially overlapping with the orthographic projection of the first light emitting element is the first compensation unit, and the compensation unit 50 partially overlapping with the orthographic projection of the second light emitting element is the second compensation unit.

[0036] like Figure 2 As shown, the orthographic projection overlap area of ​​the anode 41 of the first light emitting element and the first compensation unit is S1, and the orthographic projection overlap area of ​​the anode 41 of the second light emitting element and the second compensation unit is S2. The two orthographic projection overlap areas can be set to be different, that is, S1≠S2.

[0037] When the orthographic projections of the compensation unit 50 and the anode 41 of the light-emitting element 40 on the substrate 10 partially overlap, the anode 41 of the light-emitting element 40 and the compensation unit 50 form a compensation capacitor. The capacitance of the compensation capacitor is correlated with the area of ​​the overlapping orthographic projections. The compensation capacitor formed by the first compensation unit and the anode 41 of the first light-emitting element is the first compensation capacitor, and the compensation capacitor formed by the second compensation unit and the anode 41 of the second light-emitting element is the second compensation capacitor.

[0038] When S1≠S2, the capacitance of the first compensation capacitor is different from the capacitance of the second compensation capacitor. Since the light colors of the first light-emitting element and the second light-emitting element are different, there is a difference between the capacitance formed between the positive and negative electrodes of the first light-emitting element and the capacitance formed between the positive and negative electrodes of the second light-emitting element. By providing the first compensation capacitor for the first light-emitting element through the first compensation unit and providing the second compensation capacitor for the second light-emitting element through the second compensation unit, when the capacitance of the first compensation capacitor and the second compensation capacitor are different, the difference between the overall capacitance value of the first light-emitting element and the overall capacitance value of the second light-emitting element can be reduced.

[0039] It is understandable that when the capacitance difference between the two light-emitting elements 40 is significant, the charging time required for the anode 41 voltage of the two light-emitting elements 40 to reach the light-emitting threshold voltage during the light-emitting phase at low grayscales will also differ significantly. Consequently, the actual light-emitting time of the two light-emitting elements 40 during the light-emitting phase will also differ significantly, resulting in a significant difference in the actual brightness of the two light-emitting elements 40. When the two light-emitting elements 40 emit light of different colors, the difference in actual brightness of the two light-emitting elements 40 due to the different charging times will manifest as a color cast in low grayscale displays.

[0040] By providing a first compensation capacitor and a second compensation capacitor for the first light-emitting element and the second light-emitting element, respectively, for targeted compensation, and adjusting the capacitance of the first compensation capacitor and the capacitance of the second compensation capacitor when the capacitance values ​​of the first compensation capacitor and the second compensation capacitor are different, the difference between the overall equivalent capacitance of the first light-emitting element and the overall equivalent capacitance of the second light-emitting element can be relatively reduced. When the overall capacitance difference between the two light-emitting elements 40 is reduced, the difference in charging time between the two light-emitting elements 40 in the light-emitting stage at low grayscale will also be reduced. At this time, the actual brightness difference between the two light-emitting elements 40 will be less than the actual brightness difference before the compensation layer 30 is provided. When the two light-emitting elements 40 have different light-emitting colors, reducing the actual brightness difference between the two light-emitting elements 40 can improve the color cast phenomenon under low grayscale display.

[0041] In this embodiment, a compensation unit 50 is provided between the anode 41 of the light-emitting element 40 and the substrate 10, and a partial overlapping area exists between the orthographic projection of the compensation unit 50 and the anode 41 of the light-emitting element 40 on the substrate 10. The light emission color of the first light-emitting element is different from the light emission color of the second light-emitting element. For light-emitting elements 40 with different light emission colors, compensation units 50 with different overlapping areas can be provided. The orthographic overlapping area between the first compensation unit and the anode 41 of the first light-emitting element is different from the orthographic overlapping area between the second compensation unit and the anode 41 of the second light-emitting element. Due to the difference in the orthographic overlapping area, the size of the compensation capacitance formed between the compensation unit 50 and the anode 41 of the light-emitting element 40 is also different, thereby performing capacitance compensation of different sizes on different light-emitting elements 40. By using different compensation units 50 to perform capacitance compensation on light-emitting elements 40 with different light emission colors, the capacitance difference between light-emitting elements 40 with different light emission colors can be adjusted. When the capacitance difference between the light emitting elements 40 with different light emitting colors is reduced, the brightness difference between the light emitting elements 40 with different colors at low grayscale can be reduced, thereby improving the color cast problem at low grayscale.

[0042] In some embodiments, the capacitance formed between the anode 41 and the cathode 43 of the first light-emitting element is the first capacitance C1, and the capacitance formed between the anode 41 and the cathode 43 of the second light-emitting element is the second capacitance C2, and C1 > C2 can be made. That is, for the light-emitting elements 40 with two different light-emitting colors, the light-emitting element 40 with a larger capacitance formed between the anode 41 and the cathode 43 is taken as the first light-emitting element, and the light-emitting element 40 with a smaller formed capacitance is taken as the second light-emitting element.

[0043] The magnitude of the capacitance value of the compensation capacitance formed between the anode 41 of the light-emitting element 40 and the compensation unit 50 is usually positively correlated with the orthographic projection overlapping area. That is, when parameters affecting the capacitance value of the compensation capacitance, such as the distance between the anode 41 of the light-emitting element 40 and the compensation unit 50, the type of medium, and the thickness of the medium, do not change, the magnitude of the capacitance value of the compensation capacitance should be positively correlated with the plate area forming the capacitance, and this plate area is the orthographic projection overlapping area between the anode 41 of the light-emitting element 40 and the compensation unit 50.

[0044] Based on the positive correlation between the compensation capacitance formed between the anode 41 of the light-emitting element 40 and the compensation unit 50 and the orthographic projection overlapping area, the above two orthographic projection overlapping areas can be set as S1 < S2.

[0045] When S1 < S2, since the capacitance value of the compensation capacitance is positively correlated with the orthographic projection overlapping area, the capacitance value of the first compensation capacitance is less than the capacitance value of the second compensation capacitance. When the first capacitance C1 formed between the anode 41 and the cathode 43 of the first light-emitting element is greater than the second capacitance C2 formed between the anode 41 and the cathode 43 of the second light-emitting element, by compensating the capacitance value of the first compensation capacitance for the first light-emitting element and compensating the capacitance value of the second compensation capacitance for the second light-emitting element, the difference between the overall capacitance of the first light-emitting element and the overall capacitance of the second light-emitting element can be reduced, so that the display brightness difference between the first light-emitting element and the second light-emitting element at low gray levels is reduced, thereby improving the color cast phenomenon caused by the difference in light-emitting brightness of the two light-emitting elements 40 with different light-emitting colors at low gray levels.

[0046] In some embodiments, the light-emitting color of the first light-emitting element can be green, and the light-emitting color of the second light-emitting element can be blue or red.

[0047] Among the light-emitting elements 40 with different light-emitting colors, the capacitance formed between the anode 41 and the cathode 43 of the green light-emitting element 40 is generally greater than the capacitance formed between the anode 41 and the cathode 43 of the red light-emitting element 40 and the capacitance formed between the anode 41 and the cathode 43 of the blue light-emitting element 40. Since the capacitance formed by the green light-emitting element 40 is larger, the charging time of the green light-emitting element 40 during the light-emitting stage is longer. Accordingly, the light-emitting time of the green light-emitting element 40 is shorter than that of the red light-emitting element 40 and the blue light-emitting element 40. When the display panel performs low grayscale display, the actual light-emitting brightness of the green light-emitting element 40 is generally lower than that of the red light-emitting element 40 and the blue light-emitting element 40, resulting in color cast.

[0048] The first light-emitting element is set as a green light-emitting element 40, and the second light-emitting element is set as a blue light-emitting element 40 or a red light-emitting element 40. By providing a smaller first compensation capacitor for the first light-emitting element and a larger second compensation capacitor for the second light-emitting element, the difference between the overall capacitance of the first light-emitting element and the overall capacitance of the second light-emitting element can be reduced, so that the actual luminous brightness of the first light-emitting element is close to the actual luminous brightness of the second light-emitting element, thereby improving the luminous color cast phenomenon at low grayscale.

[0049] In some embodiments, the light emitted by the first light-emitting element may be blue, and the light emitted by the second light-emitting element may be red.

[0050] For the blue light-emitting element 40 and the red light-emitting element 40, since the capacitance formed by the blue light-emitting element 40 is generally greater than the capacitance formed by the red light-emitting element 40, setting the first light-emitting element as the blue light-emitting element 40 and the second light-emitting element as the red light-emitting element 40 can reduce the difference between the overall capacitance of the first light-emitting element and the overall capacitance of the second light-emitting element by providing a smaller first compensation capacitance for the first light-emitting element and a larger second compensation capacitance for the second light-emitting element. This makes the actual luminance of the first light-emitting element close to the actual luminance of the second light-emitting element, thereby improving the color cast phenomenon of light at low grayscales.

[0051] In some embodiments, the plurality of light-emitting elements 40 may further include a third light-emitting element, wherein the light emission color of the third light-emitting element is inconsistent with the light emission color of the first light-emitting element, and the light emission color of the third light-emitting element is also inconsistent with the light emission color of the second light-emitting element. The plurality of compensation units 50 further include a third compensation unit. It is understood that, among the plurality of compensation units 50, the compensation unit 50 having a partial overlapping area with the orthographic projection of the third light-emitting element is the third compensation unit, and the compensation capacitor formed by the third compensation unit and the anode 41 of the third light-emitting element is the third compensation capacitor.

[0052] A third capacitor C3 is also formed between the anode 41 and the cathode 43 of the third light-emitting element. When C1 > C2 > C3, it means that the first capacitor C1 formed by the first light-emitting element is the largest, and the third capacitor C3 formed by the third light-emitting element is the smallest.

[0053] As Figure 3 shown, the overlapping area of the projection of the anode 41 of the third light-emitting element and the third compensation unit can be S3, and the overlapping areas of the projections corresponding to the above three compensation units 50 can be set as S1 < S2 < S3.

[0054] When there is a positive correlation between the compensation capacitance formed between the anode 41 of the light-emitting element 40 and the compensation unit 50 and the overlapping area of the projection, the larger the overlapping area of the projection, the larger the capacitance value of the compensation capacitance formed by the compensation unit 50 and the anode 41 of the light-emitting element 40. By setting S1 < S2 < S3, among the first compensation capacitance, the second compensation capacitance, and the third compensation capacitance, the first compensation capacitance is the smallest and the third compensation capacitance is the largest. When the third capacitor C3 formed between the anode 41 and the cathode 43 of the third light-emitting element is small, a larger third compensation capacitance can be provided for compensation; when the first capacitor C1 formed between the anode 41 and the cathode 43 of the first light-emitting element is large, a smaller first compensation capacitance can be provided for compensation. After being compensated by the corresponding compensation capacitances respectively, the capacitance differences of the three light-emitting elements 40 with different light-emitting colors are reduced, and the actual brightness differences of the three light-emitting elements 40 are also correspondingly reduced, so that when the display panel includes three light-emitting elements 40 with different light-emitting colors, the color shift phenomenon can be improved during the display process at low gray levels.

[0055] In the above embodiment, the light-emitting color of the first light-emitting element can be green, the light-emitting color of the second light-emitting element can be blue, and the light-emitting color of the third light-emitting element can be red.

[0056] When normalization processing is performed on the light-emitting elements 40 emitting green, blue, and red light, respectively, at mid-grayscale, so that the luminances of the green, blue, and red light-emitting elements 40 at mid-grayscale approach uniformity, the luminance of the green light-emitting element 40 at low grayscale is lower than that of the blue light-emitting element 40, which in turn is lower than that of the red light-emitting element 40. In other words, at low grayscale, the actual luminance of the green light-emitting element 40 is the lowest, while the actual luminance of the red light-emitting element 40 is the highest. By setting the light-emitting colors of the first, second, and third light-emitting elements to green, blue, and red, respectively, a smaller first compensation capacitance can be provided for the green light-emitting element 40, while a larger third compensation capacitance can be provided for the red light-emitting element 40. By using different compensation capacitances to compensate for light-emitting elements 40 of different light-emitting colors, the luminance differences between the light-emitting elements 40 of different light-emitting colors at low grayscale can be reduced, thereby improving the color cast phenomenon at low grayscale.

[0057] In some embodiments, the orthographic projection of the compensation unit 50 on the substrate 10 is a first projection area, and the orthographic projection of the anode 41 of the light-emitting element 40 on the substrate 10 is a second projection area. When the first projection area and the second projection area at least partially overlap, the first projection area is located within the second projection area.

[0058] When the anode 41 of the light emitting element 40 and the compensation unit 50 form a compensation capacitor, the plate area of ​​the compensation capacitor is the overlapping area of ​​the orthographic projection of the anode 41 of the light emitting element 40 and the compensation unit 50 .

[0059] It is understood that if a portion of the first projected area lies outside the second projected area, this portion cannot form a plate of a compensation capacitor with the second projected area. In other words, the portion of the first projected area that lies outside the second projected area cannot form a compensation capacitor with the anode 41 of the light-emitting element 40. To reduce the material cost of the compensation unit 50, the first projected area of ​​the compensation unit 50 on the substrate 10 should be within the second projected area of ​​the anode 41 of the light-emitting element 40 on the substrate 10.

[0060] When the first projected area and the second projected area completely overlap, the plate area of ​​the compensation capacitor reaches its maximum, and in this case, the plate area is the projected area of ​​the second projected area. When the first projected area is smaller than the second projected area and the first projected area is located within the second projected area, the plate area of ​​the compensation capacitor is the projected area of ​​the first projected area. When the first projected area is located within the second projected area, the plate area of ​​the compensation capacitor can be adjusted by adjusting the area of ​​the first projected area, thereby adjusting the capacitance of the compensation capacitor.

[0061] In some embodiments, when the first projection area and the second projection area at least partially overlap, the center point of the first projection area coincides with the center point of the second projection area.

[0062] When the first projection area and the second projection area at least partially overlap, it means that the anode 41 of the light-emitting element 40 and the compensation unit 50 can form a corresponding compensation capacitor in the overlapping part of the two projection areas. The compensation capacitor can compensate for the capacitance formed between the anode 41 and the cathode 43 of the light-emitting element 40, so that the capacitance of the light-emitting elements 40 with different light-emitting colors remains close after compensation by the compensation capacitor.

[0063] When the overlapping portion of the first projection area and the second projection area is located at the edge of the second projection area, a portion of the light-emitting area of ​​the light-emitting element 40 close to the edge area will be affected by the compensation of the compensation unit 50, resulting in low luminous brightness, while another portion of the light-emitting area of ​​the light-emitting element 40 away from the edge area will not be affected by the compensation unit 50. At this time, the luminous brightness of one portion of the light-emitting area of ​​the light-emitting element 40 is lower than that of the other portion of the light-emitting area, thereby causing a four-directional color cast phenomenon. In order to improve the four-directional color cast phenomenon, when setting the compensation unit 50, the center point of the first projection area can be made to coincide with the center point of the second projection area. At this time, the light-emitting area of ​​the light-emitting element 40 close to the center area is affected by the compensation unit 50, and the surrounding areas outside the center area are not affected by the compensation. Since the luminous brightness of the surrounding areas outside the center area is relatively consistent, the four-directional color cast phenomenon can be improved.

[0064] In some embodiments, the first projection area may be a centrally symmetrical figure or an axially symmetrical figure.

[0065] When the first projection area and the second projection area partially overlap, the compensation unit 50 can form a compensation capacitor with the anode 41 of the light-emitting element 40. To avoid compensating for a portion of the light-emitting area of ​​the light-emitting element 40, which may cause color cast in all four directions when the light-emitting element 40 emits light, the compensation unit 50 can be configured as a symmetrical pattern so that the compensation unit 50 forms a compensation capacitor in the symmetrical region of the light-emitting element 40, thereby preventing a brightness difference between the light-emitting brightness of the light-emitting element 40 in one direction after compensation and the brightness of the light-emitting brightness in other directions.

[0066] It is understandable that the first projection area of ​​the compensation unit 50 on the substrate 10 may be a centrally symmetrical shape such as a square, a circle, or a ring, or an axially symmetrical shape such as a rhombus or a trapezoid.

[0067] like Figure 4 As shown, in some embodiments, the display panel may further include a signal line layer, which is located between the light emitting device layer 20 and the substrate 10 . The signal line layer may include a plurality of signal traces L.

[0068] The signal trace L is electrically connected to the compensation unit 50 and provides a compensation signal to the compensation unit 50. When receiving the compensation signal, the compensation unit 50 can form a compensation capacitor with the anode 41 of the light-emitting element 40 receiving the positive power signal to compensate for the capacitance value of the light-emitting element 40.

[0069] In some embodiments, the plurality of signal traces L may be arranged along the second direction and extended along the first direction, and the first direction and the second direction intersect.

[0070] Taking a signal line L as an example, when the signal line L extends along the first direction, it can be electrically connected to a plurality of compensation units 50 also arranged along the first direction.

[0071] Multiple compensation units 50 can be arranged in an array within the display panel, where the first direction and the second direction are perpendicular to each other. When the signal line L extends along the first direction, it can be electrically connected to a row of compensation units 50 or a column of compensation units 50 arranged along the first direction.

[0072] In some embodiments, the plurality of light emitting elements 40 may be arranged in an array in the display panel.

[0073] The same signal line may be electrically connected to a plurality of light-emitting elements 40 in the same row, or the same signal line may be electrically connected to a plurality of light-emitting elements 40 in the same column.

[0074] When the extension direction of the same signal line is the same as the row arrangement direction of the light-emitting elements 40, a single signal line L can be electrically connected to multiple light-emitting elements 40 in the same row. Similarly, when the extension direction of the same signal line is the same as the column arrangement direction of the light-emitting elements 40, a single signal line L can be electrically connected to multiple light-emitting elements 40 in the same column.

[0075] When the signal traces L are arranged in the same direction as the rows of the light-emitting elements 40, the signal traces L can provide not only compensation signals to the compensation units 50 but also stable voltage signals in the row direction for the light-emitting elements 40. That is, signal lines that extend in the row direction of the light-emitting elements 40 and can provide stable voltage signals can serve as signal traces L to provide compensation signals to the compensation units 50 arranged in the row direction.

[0076] When the signal trace L is aligned with the column arrangement direction of the light-emitting elements 40, the signal trace L can provide not only the compensation signal to the compensation unit 50 but also a stable voltage signal in the column direction for the light-emitting elements 40. Similarly, a signal line extending in the column direction of the light-emitting elements 40 and capable of providing a stable voltage signal can serve as the signal trace L to provide the compensation signal to the compensation unit 50 arranged in the column direction.

[0077] In some embodiments, when the signal trace L and the compensation unit 50 are located in the same metal layer, the signal trace L can be electrically connected to each compensation unit 50 by extending the trace during the extension process. Figure 5 The trace L2 shown in FIG. 5 is a signal trace L electrically connected to each compensation unit 50 through an extended trace.

[0078] When the signal trace L and the compensation unit 50 are located in different metal layers, if the orthographic projection of the signal trace L on the substrate 10 overlaps with the orthographic projections of each compensation unit 50 on the substrate 10, the signal trace L can be electrically connected to the corresponding compensation unit 50 through a via at the overlapping position with the orthographic projection of each compensation unit 50. Figure 5 The trace L1 shown in FIG. 5 is a signal trace L electrically connected to each compensation unit 50 through a via.

[0079] When the signal trace L and the compensation unit 50 are located on different metal layers, if the orthographic projection of the signal trace L on the substrate 10 does not overlap with the orthographic projection of each compensation unit 50 on the substrate 10, the signal trace L can also be electrically connected to the compensation unit 50 by extending the trace and combining the vias. That is, Figure 5 The trace L2 shown in FIG. 5 can also be electrically connected to each compensation unit 50 through a combination of an extended trace and a via.

[0080] Please refer to Figure 6 In some embodiments, the display panel may further include a pixel circuit layer 60, which is located between the light-emitting device layer 20 and the substrate 10. The pixel circuit layer 60 may include a plurality of pixel circuits. The pixel circuits can drive the light-emitting element 40 to emit light.

[0081] Please refer to Figure 7 In some embodiments, the signal line L may be a first power signal line PVDD.

[0082] The first power signal line PVDD can be electrically connected to the pixel circuit, and provide a first power signal to the anode 41 of the light-emitting element 40 through the pixel circuit. The cathode 43 of the light-emitting element 40 is connected to the second power signal line PVEE. When the pixel circuit connects the first power signal line PVDD with the light-emitting element 40, the light-emitting element 40 can emit light under the drive of the first power signal and the second power signal.

[0083] When providing the first power signal, the first power signal line PVDD can also function as a signal line L, electrically connected to the compensation unit 50. In this case, the compensation signal is the first power signal. Specifically, the first power signal line PVDD can be reused as a signal line L, electrically connected to the compensation unit 50 of the compensation layer 30, providing the compensation signal to the compensation unit 50. This allows the compensation unit 50 to form a compensation capacitor with the anode 41 of the light-emitting element 40 under the compensation signal, performing capacitance compensation for light-emitting elements 40 of different light-emitting colors, thereby minimizing brightness differences between light-emitting elements 40 of different colors and improving low-grayscale color cast.

[0084] Please refer to Figure 8 In some embodiments, the signal line L may be an initialization signal line Vref.

[0085] The initialization signal line Vref can be electrically connected to the pixel circuit and provide an initialization signal to the pixel circuit. During the initialization phase before the light-emitting phase, the pixel circuit can initialize the anode 41 of the light-emitting element 40 or the gate of the driving transistor using the initialization signal. This initialization signal is a stable voltage signal, so the initialization signal line Vref can also serve as a signal line L electrically connected to the compensation unit 50. In this case, the compensation signal is the initialization signal. That is, the initialization signal line Vref can be reused as a signal line L, electrically connected to the compensation unit 50 of the compensation layer 30, and provide the compensation signal to the compensation unit 50.

[0086] It is understandable that there are other signal lines in the display panel that can provide stable voltage signals. For example, the initialization signal line Vref can include a signal line Vref1 for initializing the anode 41 of the light-emitting element 40 and a signal line Vref2 for initializing the gate of the driving transistor. The signal voltages provided by the signal line Vref1 and the signal line Vref2 can be the same or different. In this case, both the signal line Vref1 and the signal line Vref2 can be reused as the signal line L and electrically connected to the compensation unit 50. Other signal lines in the display panel that can provide stable voltage signals can also be used as the signal line L to be electrically connected to the compensation unit 50 when the signal voltage is appropriate, and provide compensation signals to the compensation unit 50.

[0087] The present application also provides a display device. Figure 9 The display device may be a PC, a television, a monitor, a mobile terminal, a tablet computer, a wearable device, etc. The display device may include the display panel provided in the embodiment of the present application.

[0088] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0089] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0090] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the method and core ideas of this application. The above are only preferred implementation methods of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of this application, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of this application to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A display panel, characterized in that: The display panel includes: substrate; a light-emitting device layer located on one side of the substrate, the light-emitting device layer including a plurality of light-emitting elements, the light-emitting elements including an anode, a light-emitting layer, and a cathode stacked in sequence along the thickness direction of the display panel, the plurality of light-emitting elements including a first light-emitting element and a second light-emitting element, wherein the light emitting color of the first light-emitting element is different from the light emitting color of the second light-emitting element; a compensation layer, located between the light-emitting device layer and the substrate, comprising a plurality of compensation units, wherein the orthographic projection of the compensation unit on the substrate at least partially overlaps with the orthographic projection of the anode of the light-emitting element on the substrate, and the plurality of compensation units include a first compensation unit and a second compensation unit; The orthographic projection of the compensation unit on the substrate is a first projection area, and the orthographic projection of the anode of the light-emitting element on the substrate is a second projection area; when the first projection area and the second projection area at least partially overlap, the first projection area is located within the second projection area, and the center point of the first projection area coincides with the center point of the second projection area; The compensation capacitance formed between the anode of the light-emitting element and the compensation unit is correlated with the orthographic projection overlap area; the orthographic projection overlap area between the anode of the first light-emitting element and the first compensation unit is S1, and the orthographic projection overlap area between the anode of the second light-emitting element and the second compensation unit is S2; wherein, S1≠S2.

2. The display panel according to claim 1, wherein: A first capacitor C1 is formed between the anode and cathode of the first light-emitting element, and a second capacitor C2 is formed between the anode and cathode of the second light-emitting element, where C1>C2; The compensation capacitance formed between the anode of the light emitting element and the compensation unit has a positive correlation with the orthographic projection overlap area; wherein, S1 <S2。 3. The display panel according to claim 2, wherein: The light emitting color of the first light emitting element is green, and the light emitting color of the second light emitting element is blue or red.

4. The display panel according to claim 2, wherein: The light emitted by the first light emitting element is blue, and the light emitted by the second light emitting element is red.

5. The display panel according to claim 2, wherein: The plurality of light-emitting elements further include a third light-emitting element, wherein the light emission color of the third light-emitting element is inconsistent with the light emission color of the first light-emitting element and the light emission color of the second light-emitting element; the plurality of compensation units further include a third compensation unit; A third capacitor C3 is formed between the anode and cathode of the third light-emitting element, C1>C2>C3; the orthographic projection overlap area of ​​the anode of the third light-emitting element and the third compensation unit is S3; wherein, S1 <S2<S3。 6. The display panel according to claim 5, wherein: The light emitting color of the first light emitting element is green, the light emitting color of the second light emitting element is blue, and the light emitting color of the third light emitting element is red.

7. The display panel according to claim 1, wherein: The first projection area is a centrally symmetrical figure or an axially symmetrical figure.

8. The display panel according to claim 1, wherein: The display panel further includes: a signal line layer, located between the light-emitting device layer and the substrate, comprising a plurality of signal lines; The signal line is electrically connected to the compensation unit and is used to provide a compensation signal to the compensation unit.

9. The display panel according to claim 8, wherein: The plurality of signal lines extend along a first direction and are arranged along a second direction, and the first direction and the second direction intersect; The plurality of compensation units arranged along the first direction are electrically connected to the same signal wiring.

10. The display panel according to claim 9, wherein: The plurality of light emitting elements are arranged in an array; Multiple light-emitting elements in the same column are electrically connected to the same signal trace. Alternatively, a plurality of light-emitting elements in the same row are electrically connected to the same signal trace.

11. The display panel according to claim 10, wherein: The signal trace and the compensation unit are located on the same layer. Alternatively, the signal wiring and the compensation unit are located in different layers, and the signal wiring and the compensation unit are electrically connected through a via.

12. The display panel according to claim 8, wherein The display panel further includes: The pixel circuit layer is located between the light-emitting device layer and the substrate, and includes a plurality of pixel circuits. The pixel circuits are used to drive the light-emitting elements to emit light.

13. The display panel according to claim 12, wherein: The signal line is a first power signal line; The first power signal line is electrically connected to the pixel circuit, and is further used to provide a first power signal to the anode of the light-emitting element through the pixel circuit.

14. The display panel according to claim 12, wherein: The signal line is an initialization signal line; The initialization signal line is electrically connected to the pixel circuit and is also used to provide an initialization signal to the pixel circuit.

15. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 14.

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