CN113725273B

CN113725273B - Display panel, display device, and method and device for determining parameters of display panel

Info

Publication number: CN113725273B
Application number: CN202111012010.3A
Authority: CN
Inventors: 张琳; 许标; 杨超; 牟鑫
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2024-03-15
Anticipated expiration: 2041-08-31
Also published as: CN113725273A

Abstract

Some embodiments of the present disclosure provide a display panel, a display device, and a method and a device for determining parameters of the display panel, which relate to the field of display technology, and are used to solve the problem that color shift occurs at edges due to arrangement of pixels of a display panel. The display panel includes a plurality of repeating unit columns arranged in a second direction; each repeating unit comprises a first sub-pixel and a second sub-pixel which have different light emitting colors and are arranged along a first direction, wherein the first sub-pixel is close to a first edge compared with the second sub-pixel; the plurality of repeating unit columns are divided into a plurality of groups, including: adjacent first and second sets, the first set being adjacent to the first edge; a plurality of first drive transistors, each first drive transistor coupled to one of the first sub-pixels in the first group; a plurality of second drive transistors, each second drive transistor coupled to one of the first subpixels in the second group; the channel width-to-length ratio of at least one first drive transistor is smaller than the channel width-to-length ratio of one second drive transistor.

Description

Display panel, display device, and method and device for determining parameters of display panel

Technical Field

The present invention relates to the field of display technologies, and in particular, to a display panel, a display device, and a method and a device for determining parameters of the display panel.

Background

The organic light emitting diode (organic light emitting diode, OLED) display panel has the advantages of self-luminescence, high efficiency, bright color, light weight, low power consumption, crimping, wide use temperature range and the like, is widely applied to the middle and small-size display field, and gradually enters the fields of large-area display, illumination and the like.

The OLED display panel includes a plurality of R (red), G (green) and B (blue) sub-pixels, and for example, the sub-pixels may be arranged in S-RGB, and at this time, an edge color shift of the OLED display panel is severe, thereby resulting in a degradation of display picture quality.

Disclosure of Invention

The embodiment of the invention provides a display panel, a display device and a method and a device for determining parameters of the display panel, which are used for solving the problem that color shift occurs at the edge due to the arrangement mode of factor pixels of the display panel.

In order to achieve the above purpose, the embodiment of the present invention adopts the following technical scheme:

in one aspect, a display panel is provided having first and second edges opposite in a first direction. The display panel includes: a plurality of repeating unit columns, a plurality of first driving transistors, and a plurality of second driving transistors. Wherein a plurality of repeating unit columns are located between the first edge and the second edge and are sequentially arranged along the first direction; each repeating unit column comprises a plurality of repeating units arranged along a second direction, each repeating unit comprises a first sub-pixel and a second sub-pixel, wherein the light emitting colors of the first sub-pixel and the second sub-pixel are different, and the first sub-pixel is close to the first edge compared with the second sub-pixel; wherein the plurality of repeating unit columns are divided into a plurality of groups, each group including at least one repeating unit column; the plurality of groups includes: adjacent first and second sets, the first set being adjacent to the first edge. Each first drive transistor is coupled to one of the first subpixels in the first group. Each second drive transistor is coupled to one of the first subpixels in the second group. Wherein the channel width-to-length ratio of at least one first drive transistor is less than the channel width-to-length ratio of one second drive transistor; the first direction intersects the second direction.

In the display panel provided by the embodiment of the disclosure, the channel width-to-length ratio of at least one first driving transistor is smaller than that of one second driving transistor, so that the brightness of a first sub-pixel in a first group coupled with the first driving transistor is smaller than that of a first sub-pixel in a second group coupled with the second driving transistor, and further, the color cast of the left edge area of the display panel is relieved.

Optionally, the channel width to length ratios of the first drive transistors coupled to respective first sub-pixels of a same column of the repeating units in the first group are all equal; and/or the channel width to length ratios of the second drive transistors coupled to the respective first sub-pixels of the same repeating unit column in the second group are all equal.

Optionally, the first subpixel is configured to emit red light; the channel width-to-length ratio of the at least one first driving transistor is 0.7-0.8 times that of the second driving transistor.

Optionally, the first driving transistor and the second driving transistor with different channel width-to-length ratios have the same channel width or channel length.

Optionally, the plurality of groups further includes: a third group located on a side of the second group remote from the first group and adjacent to the second edge; the display panel further includes: a plurality of third drive transistors, each third drive transistor coupled to one of the second sub-pixels in the third group, and a plurality of fourth drive transistors, each fourth drive transistor coupled to one of the second sub-pixels in the second group; the channel width-to-length ratio of the at least one third drive transistor is smaller than the channel width-to-length ratio of the at least one fourth drive transistor.

Optionally, the channel width to length ratios of the third driving transistors coupled to the respective second sub-pixels of the same repeating unit column in the third group are all equal; and/or the channel width to length ratios of the fourth drive transistors coupled to respective second sub-pixels of the same repeating unit column in the second group are all equal.

Optionally, the second subpixel is configured to emit green light; the channel width-to-length ratio of the at least one third driving transistor is 0.8-0.9 times that of the fourth driving transistor.

Optionally, the third driving transistor and the fourth driving transistor with different channel width-to-length ratios have the same channel width or channel length.

Optionally, the repeating unit further includes: and a third sub-pixel, wherein the third sub-pixel is different from the first sub-pixel and the second sub-pixel in luminous color, and the third sub-pixel is opposite to the first sub-pixel and the second sub-pixel along the second direction.

In another aspect, a display device is provided that includes any of the display panels described above.

The display device has the same technical effects as the display panel provided in the foregoing embodiments, and will not be described herein.

In still another aspect, a method for determining parameters of a display panel is provided, where the display panel is any one of the display panels described above, and the method for determining parameters of a display panel includes: determining a theoretical drive current of a first subpixel in a second group of the display panel when the display panel is in a white balance state; determining a channel width to length ratio of a second drive transistor in the display panel based on the theoretical drive current of the first sub-pixel in the second group; and obtaining the channel width-to-length ratio of the first driving transistor in the display panel based on the channel width-to-length ratio of the second driving transistor.

The parameter determining method of the display panel has the same technical effects as those of the display panel provided in the foregoing embodiments, and will not be repeated here.

Optionally, the method for determining parameters of the display panel further includes: a ratio between a channel width-to-length ratio of a first driving transistor in the display panel and a channel width-to-length ratio of the second driving transistor is determined, so that the channel width-to-length ratio of the first driving transistor in the display panel is calculated based on the channel width-to-length ratio of the second driving transistor and the ratio.

Optionally, the plurality of groups of display panels further include: a third group located on a side of the second group remote from the first group and adjacent to the second edge; the display panel further includes: a plurality of third drive transistors, each third drive transistor coupled to one of the second sub-pixels in the third group, and a plurality of fourth drive transistors, each fourth drive transistor coupled to one of the second sub-pixels in the second group; the parameter determining method of the display panel further comprises the following steps: determining a theoretical drive current for a second subpixel in a second group of the display panel when the display panel is in a white balance state; determining a channel width to length ratio of a fourth drive transistor in the display panel based on a theoretical drive current of a second subpixel in a second group of display panels; and obtaining the channel width-to-length ratio of the third driving transistor in the display panel based on the channel width-to-length ratio of the fourth driving transistor.

Optionally, determining a theoretical drive current for a first subpixel in the second group of the display panel when the display panel is in a white balance state; and determining a theoretical drive current for a second subpixel in a second group of the display panel in a white balance state of the display panel comprises: obtaining target optical parameters of the display panel, wherein the target optical parameters comprise: the display panel displays the brightness of a white picture in a white balance state, wherein the color coordinates of the white picture are the color coordinates of a first sub-picture, a second sub-picture and a third sub-picture in the white picture; the colors of the first sub-picture, the second sub-picture and the third sub-picture are respectively the same as the luminous colors of the first sub-pixel, the second sub-pixel and the third sub-pixel in the display panel; determining the brightness of the first sub-picture and the brightness of the second sub-picture based on the target optical parameters of the display panel; determining a theoretical drive current for a first subpixel in the second group based on the luminance of the first subpixel; a theoretical drive current for a second subpixel in the second group is determined based on the luminance of the second sprite.

In yet another aspect, a parameter determination apparatus of a display panel is provided, which includes a memory and a processor. Wherein the memory is configured to store a computer program. The processor is configured to run the computer program to cause the parameter determination means of the display panel to perform any one of the above-described parameter determination methods of the display panel.

In yet another aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores computer program instructions that, when run on a computer (e.g., a parameter determination device of a display panel), cause the computer to perform the parameter determination method of a display panel as described in any of the embodiments above.

In yet another aspect, a computer program product is provided. The computer program product comprises computer program instructions which, when executed on a computer (e.g. a parameter determination device of a display panel), cause the computer to perform the method of determining parameters of a display panel as described in any of the embodiments above.

In yet another aspect, a computer program is provided. When the computer program is executed on a computer (e.g. a parameter determination device of a display panel), the computer program causes the computer to perform the parameter determination method of a display panel as described in any of the embodiments above.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a regional division diagram of a display panel in the related art;

fig. 2A is an enlarged view of a portion D1 of the display panel shown in fig. 1;

fig. 2B is an enlarged view of a portion D2 of the display panel shown in fig. 1;

FIG. 3 is a block diagram of a display panel provided in some embodiments of the present disclosure;

FIG. 4 is a diagram of a third sub-pixel versus a first sub-pixel and a second sub-pixel according to some embodiments of the present disclosure;

fig. 5 is a block diagram of a light emitting device included in one sub-pixel provided in some embodiments of the present disclosure;

FIG. 6 is a block diagram of another display panel provided in some embodiments of the present disclosure;

FIG. 7 is a diagram illustrating a coupling relationship between a pixel driving circuit and a sub-pixel in a display panel according to some embodiments of the present disclosure;

FIG. 8A is a grouping diagram of multiple repeating unit columns in a display panel provided in some embodiments of the present disclosure;

FIG. 8B is another grouping diagram of multiple columns of repeating units in a display panel provided in some embodiments of the present disclosure;

fig. 9 is a block diagram of a first drive transistor and a second drive transistor provided by some embodiments of the present disclosure;

FIG. 10 is another grouping diagram of display panels provided by some embodiments of the present disclosure;

fig. 11 is a block diagram of a third drive transistor and a fourth drive transistor provided by some embodiments of the present disclosure;

FIG. 12 is a flowchart of a method for determining parameters of a display panel according to some embodiments of the present disclosure;

FIG. 13 is a block diagram of a sample display panel provided by some embodiments of the present disclosure;

FIG. 14 is a flowchart showing the steps of S100 and S500 in FIG. 12;

fig. 15 is a block diagram of a parameter determining apparatus of a display panel according to some embodiments of the present disclosure.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and its other forms such as the third person referring to the singular form "comprise" and the present word "comprising" are to be construed as open, inclusive meaning, i.e. as "comprising, but not limited to. In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", "some examples", "and the like are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

In describing some embodiments, expressions of "coupled" and "connected" and their derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. As another example, the term "coupled" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled (communicatively coupled)" may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments disclosed herein are not necessarily limited to the disclosure herein.

At least one of "A, B and C" has the same meaning as at least one of "A, B or C," both include the following combinations of A, B and C: a alone, B alone, C alone, a combination of a and B, a combination of a and C, a combination of B and C, and a combination of A, B and C.

"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.

"plurality" means at least two.

The use of "adapted" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

In addition, the use of "based on" is intended to be open and inclusive in that a process, step, calculation, or other action "based on" one or more of the stated conditions or values may be based on additional conditions or beyond the stated values in practice.

As used herein, "about," "approximately," or "approximately" includes the stated values as well as average values within an acceptable deviation range for the particular value, as determined by one of ordinary skill in the art in view of the measurement in question and the error associated with the measurement of the particular quantity (i.e., limitations of the measurement system).

Exemplary embodiments are described herein with reference to cross-sectional and/or plan views as idealized exemplary figures. In the drawings, the thickness of layers and regions are exaggerated for clarity. Thus, variations from the shape of the drawings due to, for example, manufacturing techniques and/or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of example embodiments.

FIG. 1 is a regional division diagram of a display panel in the related art; fig. 2A and 2B are enlarged views of a D1 portion and a D2 portion, respectively, in the display panel shown in fig. 1. Referring to fig. 1, 2A and 2B, in the related art, a display panel 1' includes: three sub-pixels of red (R '), green (G '), blue (B '), and these sub-pixels may be arranged in S-RGB, for example; wherein, in a column of sub-pixels positioned at the leftmost side, R sub-pixels and B sub-pixels are alternately arranged; in the column of subpixels located at the rightmost side, the G subpixels and the B subpixels are alternately arranged. Based on the arrangement mode of the sub-pixels, when the display panel displays a white picture, the left edge area LE 'is displayed in a reddish color, and the right edge area RE' is displayed in a greenish color, namely, the edge area of the display panel is severely color-biased, so that the display picture quality is poor.

In addition, when the above display panel is used as a vehicle-mounted screen, since the vehicle-mounted screen requires high brightness and long life, a relatively high aperture ratio is required, and thus the number of Pixels Per Inch (PPI) is low, resulting in a more pronounced graininess of the screen, and thus aggravating the problem of color shift in the edge region.

To solve this technical problem, some embodiments of the present disclosure provide a display device. The display device refers to a product having an image display function. Illustratively, it may be: any one of a display, a television, a billboard, a digital photo frame, a laser printer with a display function, a telephone, a mobile phone, a tablet computer, a personal digital assistant (Personal Digital Assistant, PDA), a digital camera, a portable camcorder, a viewfinder, a monitor, a vehicle-mounted screen, a navigator, a vehicle, a large-area wall, a home appliance, an information query device (such as a service query device of an e-government, a bank, a hospital, an electric power department, etc.), and the like.

The display device may include structures such as a display panel and a circuit board. The circuit board is coupled to the display panel, and configured to provide the display panel with electrical signals required by the circuit board, and may include at least one of a flexible circuit board (Flexible Printed Circuit, abbreviated as FPC), a printed circuit board (Printed Circuit Boards, abbreviated as PCB), and the like. The display device may further include a frame. The frame is configured to house and be assembled as one unit with structures such as a display panel and a circuit board.

Some embodiments of the present disclosure also provide a display panel, which refers to a panel (or screen) having an image display function, which may be applied to the above-described display device. Illustratively, the display panel may be an OLED (Organic Light Emitting Diode ) display panel, a QLED (Quantum Dot Light Emitting Diodes, quantum Point light emitting diode) display panel, a micro LED (including a miniLED or micro LED) display panel, or the like.

Fig. 3 is a top view of a display panel provided by some embodiments of the present disclosure. Referring to fig. 3, the display panel 1 has a display Area (AA) and a peripheral Area S located at least one side of the display Area AA, for example, the peripheral Area S may be disposed around the display Area AA by one circle.

The display panel 1 includes: the plurality of repeating units 11 disposed in the AA region, for example, the plurality of repeating units 11 may be disposed in an array. Illustratively, the display panel 1 has a first edge E1 and a second edge E2 opposite in a first direction (hereinafter referred to as X-direction), comprising: a plurality of repeating unit columns located between the first edge E1 and the second edge E2 and sequentially arranged in the X direction, for example, UC1, UC2, … …, UCn total n repeating unit columns. Each of the repeating unit columns UCi (i e1, 2, …, n) includes a plurality of repeating units 11 arranged in the second direction (hereinafter referred to as Y direction). Wherein, the X direction and the Y direction are both positioned in the plane where the display panel 1 is positioned, namely, are both perpendicular to the thickness direction of the display panel 1; and, the two cross each other. For example, the X direction and the Y direction are perpendicular to each other.

Each of the repeating units 11 includes a plurality of sub-pixels 110 having different emission colors. Specifically, the plurality of subpixels 110 in each repeating unit 11 may include: a first subpixel 110_1 and a second subpixel 110_2 having different emission colors and arranged in the X direction. Wherein the first subpixel 110_1 is closer to the first edge E1 than the second subpixel 110_2. The present embodiment is not limited to the emission color of each sub-pixel 110. Illustratively, the first subpixel 110_1 is configured to emit red light, while the second subpixel 110_2 is configured to emit green light; at this time, the first subpixel 110_1 may be denoted as an R subpixel, and the second subpixel 110_2 may be denoted as a G subpixel. Also exemplary, the first subpixel 110_1 is configured to emit green light and the second subpixel 110_2 is configured to emit red light.

In some embodiments, the plurality of sub-pixels 110 in each repeating unit 11 may further include a third sub-pixel 110_3, the third sub-pixel 110_3 being different from each of the first sub-pixel 110_1 and the second sub-pixel 110_2 in emission color, for example, the third sub-pixel 110_3 is configured to emit blue light, and the third sub-pixel 110_3 may be denoted as a B sub-pixel. The positional relationship between the third sub-pixel 110_3 and the first sub-pixel 110_1 and the second sub-pixel 110_2 is not limited in this embodiment. Illustratively, fig. 4 shows one positional relationship of the third sub-pixel with the first sub-pixel and the second sub-pixel. Referring to fig. 4, in one repeating unit 11, the third subpixel 110_3 is opposite to both the first subpixel 110_1 and the second subpixel 110_2 in the Y direction. Specifically, in the first region Q1, the third subpixel 110_3 is opposite to the first subpixel 110_1; wherein, the width w1 of the first region Q1 in the X direction may be smaller than the width w3 of the first subpixel 110_1 in the X direction, and for example, w1 may be equal to w3. In the second region Q2, the third subpixel 110_3 is opposite to the second subpixel 110_2; wherein, the width w2 of the second region Q2 in the X direction may be smaller than the width w4 of the second subpixel 110_2 in the X direction, and for example, w2 may be equal to w4. Also for example, the third subpixel 110_3 may be further aligned with the first and second subpixels 110_1 and 110_2 in the X direction and located between the first and second subpixels 110_1 and 110_2.

In other embodiments, the plurality of subpixels 110 in each repeating unit 11 may further include a fourth subpixel, e.g., configured to emit white light.

In one possible implementation, referring to fig. 5, one sub-pixel 110 includes a light emitting device configured to emit one primary color light (red, green, or blue light), which may be disposed on the substrate 12 of the display panel 1. The light emitting device may be an OLED, a QLED, a micro LED, or the like, for example. The substrate 12 may be a rigid substrate made of glass or the like, or may be a flexible substrate made of Polyimide (PI) or the like, for example.

Illustratively, the light emitting device includes a first electrode 111 and a second electrode 112, and a light emitting functional layer 113 between the first electrode 111 and the second electrode 112. Wherein the first electrode 111 is remote from the substrate 12 compared to the second electrode 112. As an example, the first electrode 111 is a cathode and the second electrode 112 is an anode. The light emitting functional layer 123 may include a light emitting layer EL, a hole transport layer HTL (Hole Transporting Layer) between the light emitting layer EL and the anode, and an electron transport layer ETL (Election Transporting Layer) between the light emitting layer EL and the cathode. Of course, the present example may further provide a hole injection layer HIL (Hole Injection Layer) between the hole transport layer HTL and the anode, and an electron injection layer EIL (Election Injection Layer) between the electron transport layer ETL and the cathode, as needed. In addition, an electron blocking layer EBL (Electron Blocking Layer) may be provided between the hole transport layer HTL and the light emitting layer EL, and a hole blocking layer HBL (Hole Blocking Layer) may be provided between the electron transport layer ETL and the light emitting layer EL. As another example, the first electrode 111 is an anode and the second electrode 112 is a cathode. Wherein the material of the light emitting layer EL determines the color of the light emitted by the light emitting device.

In another possible implementation, one subpixel includes a light emitting device configured to emit white light and a color filter located on a light emitting side of the light emitting device and matching a light emitting color of the subpixel. For example, in the R sub-pixel, the structure of the light emitting device can be similarly seen in fig. 5, in which the material of the light emitting layer EL is a material capable of emitting white light; the color filter is a red filter.

In addition, fig. 6 is a block diagram of another display panel. Referring to fig. 6, the display panel 1 may further include: a plurality of pixel driving circuits 120, each pixel driving circuit 120 coupled to one sub-pixel 110, is configured to drive the sub-pixel 110 to emit light. For example, the pixel driving circuit 120 is configured to drive the sub-pixel 110 to emit light having a brightness corresponding thereto in response to the received data signal. It should be noted that fig. 6 only illustrates the positional relationship between a pixel driving circuit 120 and a sub-pixel 110, for example, the pixel driving circuit 120 is located between the sub-pixel 110 and the substrate coupled thereto, and the pixel driving circuit 120 and the sub-pixel 110 may have an overlapping portion in the thickness direction of the display panel 1 (i.e., the direction perpendicular to the paper surface).

FIG. 7 shows the coupling relationship between the pixel driving circuit and the sub-pixels in the display panel. The structure of the pixel driving circuit can be designed according to practical situations. For example, referring to fig. 7, the pixel driving circuit 120 is composed of a transistor, a capacitor (C) or the like. For example, the pixel driving circuit may include two transistors (one switching transistor T1 and one driving transistor Td) and one capacitor C, constituting a 2T1C structure; of course, the pixel driving circuit may further include three or more transistors (a plurality of switching transistors and one driving transistor) and at least one capacitor, and may be, for example, a 3T1C structure or a 7T1C structure.

Wherein the driving transistor Td includes a control electrode dg, a first electrode d1 and a second electrode d2, and is configured to control the magnitude of current flowing through the first electrode d1 and the second electrode d2 in response to the voltage of the control electrode dg. The light emitting device in the sub-pixel 110 is connected in series to a line (e.g., a branch) of the driving transistor Td where the first and second poles d1 and d2 are located, one end of the line being coupled to the first power voltage terminal Vdd, and the other end being coupled to the second power voltage terminal Vss. It can be seen that the sub-pixel 110 is coupled to the driving transistor Td.

Taking the pixel driving circuit 120 of the 2T1C structure shown in fig. 7 as an example, in the pixel driving circuit 120, the switching transistor T1 writes the data signal Vdata to the control electrode dg of the driving transistor Td in response to the gate scan signal G; the driving transistor Td controls the magnitude of the current on the line where the light emitting device is located, i.e., the magnitude of the current flowing through the light emitting device, in response to the data signal Vdata, thereby controlling the light emitting luminance of the light emitting device.

The transistors may be thin film transistors (Thin Film Transistor, TFT for short), field effect transistors (metal oxide semiconductor, MOS for short) or other switching devices with the same characteristics, and in the embodiments of the present disclosure, the thin film transistors are taken as examples.

The control electrode of the thin film transistor is a grid electrode, the first electrode of the thin film transistor is one of a source electrode and a drain electrode, and the second electrode of the thin film transistor is the other of the source electrode and the drain electrode. Since the source and drain of the thin film transistor can have the same function in the thin film transistor, the source and drain may not be particularly distinguished. In one example, in the case where the thin film transistor is a P-type transistor, the first pole of the thin film transistor is a source and the second pole is a drain. In another example, in the case where the thin film transistor is an N-type transistor, a first pole of the transistor is a drain and a second pole is a source.

Referring to fig. 8A and 8B, in the display panel 1, the above-described plurality of repeating unit columns (UC 1, UC2, … …, UCn) may be divided into a plurality of groups, each group Gi (i=1, 2, …, m; 2+.ltoreq.m, m and n each being an integer) including at least one repeating unit column, that is, each group Gi includes: a repeating unit column or a plurality of repeating unit columns distributed in succession. Wherein the plurality of groups includes adjacent first and second groups G1, G2, the first group G1 being adjacent to the first edge E1.

In the embodiment of the disclosure, two adjacent two means that no other repeating unit columns are arranged between the two; for example, no other repeating unit columns are provided between the first group G1 and the first edge E1, and no other repeating unit columns are provided between the first group G1 and the second group G2.

In some embodiments, with continued reference to FIGS. 8A and 8B, the first group G1 includes p repeating columns of units, i.e., repeating columns UC 1-UCp, where 1.ltoreq.p < n, where p is any integer within the range, e.g., p may be equal to 1,2,3,4,5,6, 7, etc.; the repeating unit rows UC (p+1) to UCn other than the first group G1 may all belong to the second group G2, or some of the repeating unit rows UC (p+1) to UCq may belong to the second group G2, where p+1 is equal to or less than q is equal to or less than n-1, q is any integer in the value range, for example, the number of repeating unit rows in the second group G2 may be 1,2,5, or the like. As an example, in fig. 8A, 1 repeating unit row is included in the first group G1, that is, the repeating unit row UC1, and the other repeating unit rows UC2 to UCn all belong to the second group G2. As another example, in fig. 8B, 2 repeating unit columns, i.e., repeating unit columns UC1 to UC2, are included in the first group G1, and repeating unit columns UC3 to UC (n-1) belong to the second group G2.

In some embodiments, the number of repeating unit columns in the first group G1 may be determined by the width of the left edge region (i.e., the number of corresponding repeating unit columns in the region where the color shift phenomenon occurs) in the related art, and the width of the left edge region is generally smaller. For example, the number of repeating unit columns in the first group G1 may be smaller than the number of repeating unit columns in the second group G2.

Further, as described above, each of the repeating unit columns includes a plurality of first sub-pixels 110_1, a plurality of second sub-pixels 110_2, and a plurality of third sub-pixels 110_3, each of which corresponds to one driving transistor. For clarity of description of the solution provided by the embodiments of the present disclosure, hereinafter, the driving transistor corresponding to each first subpixel 110_1 in the first group G1 is referred to as a first driving transistor Td1, i.e., each first driving transistor Td1 is coupled with one first subpixel 110_1 in the first group G1; the driving transistor corresponding to each first subpixel 110_1 of the second group G2 is referred to as a second driving transistor Td2, i.e., each second driving transistor Td2 is coupled to one first subpixel 110_1 of the second group G2.

Wherein the channel width-to-length ratio of at least one first driving transistor Td1 is smaller than the channel width-to-length ratio of one second driving transistor Td 2. Since the channel width-to-length ratio of the driving transistor is in a proportional relationship with the light emission luminance of the sub-pixel coupled to the driving transistor, when the display panel displays a white screen, the data signals of the first driving transistor Td1 and the second driving transistor Td2 are the same, and at this time, the light emission luminance of the sub-pixel coupled to the first driving transistor Td1 having a smaller channel width-to-length ratio (i.e., some of the first sub-pixels 101_1 in the first group G1) is smaller than the light emission luminance of the first sub-pixel 101_1 in the second group G2. For example, the first subpixel 101_1 emits red light, which reduces the brightness of the red light in the area where the first group G1 is located (the left edge area in fig. 8A and 8B), and provides a new idea for solving the problem of color shift of the red light in the edge area of the display panel.

In some embodiments, in order to further alleviate the color shift problem of the edge area of the display panel near the first edge, the channel width-to-length ratio of at least one first driving transistor Td1 is smaller than the channel width-to-length ratio of each second driving transistor Td2 in the display panel 1. Illustratively, all of the first driving transistors Td1 are smaller than the channel width to length ratio of each of the second driving transistors Td 2. Also exemplary, among all the first driving transistors Td1, a part of the first driving transistors Td1 is smaller than the channel width-to-length ratio of each of the second driving transistors Td2, and the channel width-to-length ratio of any one of the remaining part of the first driving transistors Td1 is equal to one of the second driving transistors Td 2.

In one possible implementation, the first subpixel 110_1 is configured to emit red light, and the channel width-to-length ratio of at least one first driving transistor Td1 is 0.7-0.8 times that of a second driving transistor Td 2; for example, the multiple may be 0.7,0.72,0.73,0.75,0.76,0.78,0.8 or the like, thereby helping to better improve the problem of color shift in the edge region of the display panel near the first edge. Illustratively, when the first subpixel 110_1 is configured to emit red light, the channel width-to-length ratio of all the first driving transistors Td1 is 0.7-0.8 times that of a second driving transistor Td 2.

In some embodiments, the channel widths or lengths of the first driving transistor Td1 and the second driving transistor Td2 with different channel width ratios are the same, so that the purpose that the channel width ratio of the first driving transistor Td1 is smaller than the channel width ratio of the second driving transistor Td2 can be achieved by only changing one of the length and the width of the channel of the first driving transistor Td1, and further the difficulty of product design and manufacturing can be further reduced on the basis of improving the color cast problem of the left edge region.

As an example, referring to fig. 9, each driving transistor, for example, the second driving transistor Td2, includes: an active layer AC and a gate pattern GP, wherein the active layer AC includes: a source region S, a drain region D and a channel region Ch therebetween. Wherein the channel region Ch may be located within an orthographic projection (i.e., a projection in a thickness direction of the display panel) of the gate pattern GP on the active layer AC. The first driving transistor Td1 also has such a structure, and is not described herein. In addition, in (a) of fig. 9, the channel width of the second transistor Td2 is denoted as W2, and the channel length is denoted as L2. In (b) and (c) in fig. 9, the channel width of the first transistor Td1 is denoted as W1, and the channel length is denoted as L1.

In one possible way, see (a) and (b) in fig. 9, W1 is smaller than W2, l1=l2, such that W1/L1 < W2/L2. For example, l1=l2=30μm, w2=3μm, and W1 has a value ranging from 2.1 to 2.4 μm, and may be, for example, 2.2±0.1, and may be, for example, 2.2.

In another implementation, see (a) and (c) in fig. 9, w1=w2, L1 is greater than L2, such that W1/L1 < W2/L2. For example, w1=w2=3 μm, l2=30 μm, and the value of L1 is 37.5 to 42.8 μm, which may be 41±1, for example.

In some embodiments, the light extraction effect due to each first subpixel located in the same repeating unit column is approximately the same; therefore, the channel width to length ratios of the first driving transistors Td1 coupled to the respective first sub-pixels 110_1 of the same repeating unit column in the first group G1 are all equal. For example, the channel width to length ratios of the first driving transistors Td1 coupled to the respective first sub-pixels 110_1 in the repeating unit row UC1 are all equal.

As an example, the channel width-to-length ratios of the respective first driving transistors Td1 (i.e., all the first driving transistors Td 1) corresponding to the first group G1 are equal. Therefore, on the basis of improving the color cast problem of the left edge region, the difficulty of product design and manufacture can be reduced.

In some embodiments, the channel width to length ratios of the second driving transistors Td2 coupled with the respective first subpixels 110_1 of the same repeating unit column in the second group G2 are all equal. As an example, the channel width-to-length ratios of the respective second driving transistors Td2 (i.e., all the second driving transistors Td 2) corresponding to the second group G2 are equal. This reduces the difficulty of product design and manufacture.

Further, referring to fig. 10, in the display panel 1, the plurality of groups may include adjacent first and second groups G1 and G2, and a third group G3 located at a side of the second group G2 remote from the first group G1 and adjacent to the second edge. Here, "adjacent" may refer to the explanation above, and will not be described here again. Illustratively, the first group G1 includes p repeating unit columns, i.e., repeating unit columns UC 1-UCp, wherein 1.ltoreq.p < n-1, where p is any integer within the range for which p is an integer, e.g., p may be equal to 1,2,3,4,5,6, 7, etc.; the repeating unit columns UC (p+1) to UCq belong to the second group G2, wherein p+1 is less than or equal to q is less than or equal to n-1, q is any integer in the value range, the repeating unit columns UC (q+1) to UCn belong to the third group G3, and the number (i.e. n-q) of the repeating unit columns included in the third group G3 can be equal to 1,2,3,4,5,6 or 7. As an example, in fig. 8B, the first group G1 includes 2 repeating unit columns UC1 to UC2, and the repeating unit columns UC3 to UC (n-1) belong to the second group G2, and the repeating unit column UCn belongs to the third group G3.

In some embodiments, the number of repeating unit columns in the third group G3 may be determined by the width of the right edge region in the related art, and the width of the right edge region is generally smaller. For example, the number of repeating unit columns in the third group G3 may be smaller than the number of repeating unit columns in the second group G2. As another example, the number of repeating unit columns in the third group G3 may be equal to the number of repeating unit columns in the first group G1.

The plurality of groups of the display panel include a first group G1 and a second group G2 adjacent to each other, and a third group G3 adjacent to the second edge and located on a side of the second group G2 away from the first group G1. For clarity of description of the solution provided by the embodiments of the present disclosure, hereinafter, the driving transistor corresponding to each of the second pixels 110_2 of the third group G3 is referred to as a third driving transistor Td3, i.e., each third driving transistor Td3 is coupled with one of the second sub-pixels 110_2 of the third group G3; the driving transistor corresponding to each second subpixel 110_2 of the second group G2 is referred to as a fourth driving transistor Td4, i.e., each fourth driving transistor Td4 is coupled to one second subpixel 110_2 of the second group G2.

Wherein the channel width-to-length ratio of at least one third driving transistor Td3 is smaller than the channel width-to-length ratio of one fourth driving transistor Td 4. Since the channel width-to-length ratio of the driving transistor is in a proportional relationship with the light emission luminance of the sub-pixel coupled to the driving transistor, when the display panel displays a white screen, the data signals of each third driving transistor Td3 and each fourth driving transistor Td4 are the same, and at this time, the light emission luminance of the sub-pixel coupled to the third driving transistor Td3 having a smaller channel width-to-length ratio (i.e., some of the second sub-pixels 101_2 in the third group G3) is smaller than the light emission luminance of the second sub-pixel 101_2 in the second group G2. For example, the second subpixel 101_2 emits green light, which reduces the brightness of the green light in the area where the third group G3 is located (the right edge area of fig. 10), and provides a new idea for solving the problem of green color shift in the edge area of the display panel.

In some embodiments, in order to further alleviate the color shift problem of the edge area of the display panel near the second edge, the channel width-to-length ratio of at least one third driving transistor Td3 is smaller than the channel width-to-length ratio of each fourth driving transistor Td2 in the display panel 1. Illustratively, all of the third driving transistors Td3 are smaller than the channel width to length ratio of each of the fourth driving transistors Td 4. Also illustratively, among all the third driving transistors Td3, a portion of the third driving transistors Td3 is smaller than the channel width-to-length ratio of each of the fourth driving transistors Td4, and the channel width-to-length ratio of any one of the remaining portion of the third driving transistors Td3 is equal to one of the fourth driving transistors Td 4.

In one possible implementation, the second subpixel 110_1 is configured to emit green light, and the channel width-to-length ratio of the at least one third driving transistor Td3 is 0.8 to 0.9 times the channel width-to-length ratio of the fourth driving transistor Td 4; for example, the multiple may be 0.8,0.82,0.83,0.85,0.86,0.88,0.9 or the like, thereby helping to better improve the problem of color shift in the edge region of the display panel near the second edge. Illustratively, when the second subpixel 110_2 is configured to emit green light, the channel width-to-length ratio of all the third driving transistors Td3 is 0.8 to 0.9 times the channel width-to-length ratio of the fourth driving transistor Td 4.

In some embodiments, the channel widths or lengths of the third driving transistor Td3 and the fourth driving transistor Td4 with different channel width ratios are the same, so that the purpose that the channel width ratio of the third driving transistor Td3 is smaller than the channel width ratio of the fourth driving transistor Td4 can be achieved by only changing one of the length and the width of the channel of the third driving transistor Td3, and further the difficulty of product design and manufacturing can be further reduced on the basis of improving the color cast problem of the right edge region.

As an example, referring to fig. 11, each driving transistor, for example, the fourth driving transistor Td4, includes: an active layer AC and a gate pattern GP, wherein the active layer AC includes: a source region S, a drain region D and a channel region Ch therebetween. Wherein the channel region Ch may be located within an orthographic projection (i.e., a projection in a thickness direction of the display panel) of the gate pattern GP on the active layer AC. The third driving transistor Td3 also has such a structure, and is not described herein. In fig. 11 (a), the channel width of the fourth transistor Td4 is denoted by W4, and the channel length is denoted by L4. In (b) and (c) in fig. 11, the channel width of the third transistor Td3 is denoted as W3, and the channel length is denoted as L3.

In one possible way, see (a) and (b) in fig. 11, W3 is smaller than W4, l3=l4, such that W3/L3 < W4/L4. For example, l3=l4=30μm, w4=3μm, and W3 has a value ranging from 2.4 to 2.7 μm, and may be, for example, 2.6±0.1, and may be, for example, 2.6.

In another implementation, see (a) and (c) in fig. 11, w3=w4, L3 is greater than L4, such that W3/L3 < W4/L4. For example, w3=w4=3 μm, l4=30 μm, and the value of L3 is 33.3 to 37.5 μm, which may be 35±1, for example, 34.

In some embodiments, the light extraction effect due to each second subpixel located in the same repeating unit column is approximately the same; therefore, the channel width to length ratios of the third driving transistors Td3 coupled to the respective second sub-pixels 110_2 of the same repeating unit column in the third group G3 are all equal. For example, the channel width to length ratios of the third driving transistors Td3 coupled to the respective second sub-pixels 110_2 in the repeating unit column UCn are all equal.

As an example, the channel width-to-length ratios of the respective third driving transistors Td3 (i.e., all the third driving transistors Td 3) corresponding to the third group G3 are equal. Therefore, on the basis of improving the color cast problem of the right side edge area, the difficulty of product design and manufacture can be reduced.

In some embodiments, the channel width to length ratios of the fourth driving transistors Td4 coupled with the respective second subpixels 110_2 of the same repeating unit column in the second group G2 are all equal. As an example, the channel width-to-length ratios of the respective fourth driving transistors Td4 (i.e., all the fourth driving transistors Td 4) corresponding to the second group G2 are equal. This reduces the difficulty of product design and manufacture.

For the display panel provided by any one of the embodiments, an embodiment of the disclosure further provides a method for determining parameters of the display panel. The display panel may include a first sub-pixel, a second sub-pixel and a third sub-pixel with different light emission colors, and the parameter determination method is described in detail below by taking the first sub-pixel as an R sub-pixel, the second sub-pixel as a G sub-pixel, and the third sub-pixel as a B sub-pixel as an example. The execution subject of the parameter determination method may be a parameter determination device of the display panel, which may be a computer or the like, for example.

Referring to fig. 12, the parameter determining method of the display panel includes:

s100, determining a theoretical driving current of a first sub-pixel in a second group of the display panel in a white balance state of the display panel.

Industry has industry standards for products such as display panels, for example, the display panel needs to meet the requirement of white balance when displaying white pictures. The white frame may be a frame corresponding to a case where the gray scale of each sub-pixel in the display panel is at a maximum. For example, the gray scale of each sub-pixel ranges from 0 to 255, and when the gray scale of each sub-pixel is 255, the display panel displays a white screen.

Referring to fig. 8A, 8B and 10, when the display panel 1 displays a white screen satisfying the white balance requirement, each of the repeating units in the second group G2 of the display panel 1 displays a white color patch, in this embodiment, it is necessary to determine a theoretical driving current of at least one first subpixel 110_1 (e.g., one first subpixel 110_1; and, for example, each first subpixel 110_1) in the second group G2. For example, the first subpixel 110_1 includes an OLED, and the theoretical driving current herein refers to a driving current for driving the OLED to emit light in a case where the repeating unit to which the first subpixel 110_1 belongs displays a white color patch.

S200, determining the channel width-to-length ratio of the second driving transistor in the display panel based on the theoretical driving current of the first sub-pixel in the second group.

Illustratively, the driving current for driving the OLED to emit light satisfies the formula:

wherein I is a driving current, k is a known number,to drive the channel width to length ratio of the transistor, V _data Data voltage, V _dd Is the supply voltage. For example, the first subpixel is an R subpixel, where I can be denoted as I _R 。

The channel width to length ratio of one second driving transistor Td2 in the display panel 1 shown in fig. 8A, 8B and 10 can be obtained by the above formula or by simulation. For example, the channel width to length ratio of the respective second driving transistors Td2 may be equal.

S300 (optional), a ratio (hereinafter referred to as a first ratio) between a channel width-to-length ratio of the first driving transistor and a channel width-to-length ratio of the second driving transistor in the display panel is determined.

First, referring to fig. 13, a sample display panel 1″ is provided, the sample display panel 1″ including a plurality of test repeating units 11', and a test pixel driving circuit coupled to each of the test repeating units 11'. Here, each of the test repeating units and each of the test pixel driving circuits may refer to one repeating unit 11 and the pixel driving circuit to which the repeating unit is coupled in the second group G2 of the display panel 1 shown in fig. 8A, 8B and 10, respectively.

For example, each of the test repeating units 11 'includes a first test subpixel 110_1', a second test subpixel 110_2', and a third test subpixel 110_3'. Wherein the first test subpixel 110_1' is configured to emit red light, the second test subpixel 110_2' is configured to emit green light, and the third test subpixel 110_3' is configured to emit blue light.

The driving transistor coupled to the first test subpixel 110_1' is the same as the second driving transistor Td2 in the second group G2 of the display panel 1 shown in fig. 8A, 8B and 10, and is still denoted by Td 2. The driving transistor coupled to the second test subpixel 110_2' is the same as the fourth driving transistor Td4 in the second group G2 of the display panel 1 shown in fig. 8A, 8B and 10, and is still denoted by Td 4.

As another example, the plurality of test repeating units 11' in the sample display panel 1″ are similarly arranged in a plurality of test repeating unit columns UC1', UC2 '; and the grouping of the test repeating unit columns may also be made with reference to the above embodiment for the grouping of the repeating unit columns in the display panel. For example, referring to the grouping example shown in fig. 10, three test groups G1', G2', and G3' shown in fig. 13 are obtained.

Next, the brightness of a first test sub-pixel 110_1' of the sample display panel 1″ in the white balance state is obtained.

For example, each test subpixel in the sample display panel 1″ displays a maximum gray level Gmax, e.g., 255, when the sample display panel 1″ displays a white screen, and when the brightness of the first test subpixel 110_1' is denoted as L1 _Gmax 。

Then, the gray scale of each first test subpixel 110_1 'in the first test group G1' of the sample display panel 1″ is reduced to the test gray scale Gb (e.g., 220), thereby improving the sample display panel 1″ in the first testColor shift problem (e.g., no longer reddish) at the position of group G1'. At this time, the luminance of each first test subpixel 110_1 'at the position of the first test group G1' is thereby reduced to L1 _Gb 。

Wherein,

GAMMA is a GAMMA (GAMMA) coefficient of the display panel, for example, GAMMA may be 2.2.

Finally, the following formula is used to determine the first ratio β1.

In other possible implementations, due to the first ratioTherefore, L1 may not be calculated _Gb The first ratio β1 can be obtained using the gray scale Gb.

In other possible implementations, L1 may be measured using an optical instrument _Gb Thereafter, reuse Thus, a first ratio β1 is obtained.

Through the verification, when the light intensity (i.e. brightness) of the first test sub-pixel (e.g. R sub-pixel) in the left edge area is reduced by 0.7-0.8 times of that of the normal, the color cast problem of the display in the left edge area can be obviously reduced.

For the display panel in this embodiment, it is not necessary to change the luminance by changing the channel width-to-length ratio of the driving transistor by changing the gray scale. Since the luminance of the sub-pixel and the channel width-to-length ratio of the driving transistor driving the sub-pixel are in a direct proportional relationship, the above-described first ratio β1 can be used as a ratio between the channel width-to-length ratio of the first driving transistor Tdl and the channel width-to-length ratio of the second driving transistor Td2 in the display panel shown in fig. 8A, 8B and 10.

Further, in other possible implementations, S300 may include: the parameter determination means receives the first ratio. As an example, the first ratio may be that the external device sends to the parameter determination means; for example, the user inputs the first ratio to the parameter determination means through the input device.

S400, the channel width-to-length ratio of the first driving transistor in the display panel is obtained based on the channel width-to-length ratio of the second driving transistor.

Illustratively, in the display panel 1 shown in fig. 8A, 8B and 10, the channel width-to-length ratio of the second driving transistor Td2 is multiplied by the first ratio β1 to obtain the channel width-to-length ratio of the first driving transistor Td 1.

In consideration of the process capability and the specific requirements, the channel width-to-length ratio of the first driving transistor Td1 is reasonably selected within the above range of values.

In some embodiments, referring to fig. 10, the plurality of groups of display panels further comprise: a third group G3 located on a side of the second group remote from the first group G1 and adjacent to the second edge E2; the display panel further includes: a plurality of third driving transistors Td3 and a plurality of fourth driving transistors Td4, each third driving transistor Td3 being coupled with one second subpixel 110_2 of the third group G3, each fourth driving transistor Td4 being coupled with one second subpixel 110_2 of the second group G2.

With continued reference to fig. 12, the method for determining parameters of the display panel further includes:

s500, determining a theoretical driving current of a second sub-pixel in a second group of the display panel in the white balance state.

For example, similar to S100, referring to fig. 10, in the case where at least one repeating unit 11 (e.g., one repeating unit 11 or each repeating unit 11) in the second group G2 of the display panel 1 displays a white color patch, a theoretical driving current of at least one second subpixel 110_2 (e.g., one second subpixel 110_2; e.g., each second subpixel 110_2) in the second group G2 is determined. For example, the second subpixel is a G subpixel, and the theoretical driving current of the second subpixel can Let the reference number I _G 。

S600, determining a channel width-to-length ratio of a fourth driving transistor in the display panel based on the theoretical driving current of the second sub-pixel in the second group of the display panel.

The channel width to length ratio of one fourth driving transistor Td4 in the display panel 1 shown in fig. 10 can be obtained by driving the driving current of the OLED light emission or by simulation, for example. For example, the channel width to length ratio of the respective fourth driving transistors Td4 may be equal.

S700 (optional), a ratio (hereinafter referred to as a second ratio) between the channel width-to-length ratio of the third driving transistor and the channel width-to-length ratio of the fourth driving transistor in the display panel is determined.

In some possible implementations, S700, like S300, includes, for example, the steps of:

referring to FIG. 13, the brightness L2 of a second test sub-pixel 110_2 'of the sample display panel 1' in the white balance state is obtained _Gmax 。

Then, the gray scale of each second test subpixel 110_2' in the third test group G3' of the sample display panel 1″ is reduced to the test gray scale Gb, thereby improving the color shift problem (e.g., no longer green) of the sample display panel 1″ at the position of the third test group G3 '. At this time, the luminance of each of the second test sub-pixels 110_2 'at the position of the third test group G3' is thereby reduced to L2 _Gb 。

Wherein,

gamma is a gamma coefficient of the display panel, for example, gamma may be 2.2.

Finally, the following formula is used to determine the second ratio β2.

In other possible implementations, due to the secondProportion ofTherefore, L2 may not be calculated _Gb The second ratio β2 can be obtained using the gray scale Gb.

In still other possible implementations, L2 may be measured using an optical instrument _Gb Thereafter, reuseThus, a second proportion β2 is obtained.

Through the verification, when the light intensity (i.e. brightness) of the second test sub-pixel (e.g. the G sub-pixel) in the right edge area is reduced by 0.8 to 0.9 times of that of the normal sub-pixel, the color cast problem of the display in the right edge area can be obviously reduced.

The above-described second ratio β2 may be used as a ratio between the channel width-to-length ratio of the third driving transistor Td3 and the channel width-to-length ratio of the fourth driving transistor Td4 in the display panel shown in fig. 10.

Further, in other possible implementations, S700 may include: the parameter determination means receives the second ratio. As an example, the second ratio may be that the external device sends to the parameter determination means; for example, the user inputs the second ratio to the parameter determination means via the input device.

S800, the channel width-to-length ratio of the third driving transistor in the display panel is obtained based on the channel width-to-length ratio of the fourth driving transistor.

Illustratively, fig. 10 shows that in the display panel 1, the channel width-to-length ratio of the fourth driving transistor Td4 and the second ratio β2 result in the channel width-to-length ratio of the third driving transistor Td 3.

The channel width-to-length ratio of the third driving transistor Td3 is reasonably selected in the above range of values in consideration of process capability and specific requirements.

Referring to fig. 14, the implementation of S100 and S500 above is described in detail below, and exemplary implementations of S100 and S500 may include the following steps:

s110, acquiring target optical parameters of the display panel.

Wherein the target optical parameters include: the display panel displays the brightness of a white picture (marked as a W picture), the color coordinates of the white picture, and the respective color coordinates of a first sub-picture, a second sub-picture and a third sub-picture in the white picture in a white balance state. The colors of the first sub-picture (e.g., R-picture), the second sub-picture (e.g., G-picture), and the third sub-picture (B-picture) are the same as the light emission colors of the first sub-pixel (e.g., R-sub-pixel), the second sub-pixel (e.g., G-sub-pixel), and the third sub-pixel (e.g., B-sub-pixel), respectively, in the display panel.

Wherein the brightness of the W picture is denoted as Y _w In the white balance state, the color sitting mark of the W picture is (x) _W ，y _W ) The color sitting mark of the R picture is (x) _R ，y _R ) The color sitting of the G picture is marked as (x _G ，y _G ) The color sitting of the B picture is marked as (x _B ，y _B )。

X, Y, Z in the examples of the present disclosure are tristimulus values in the CIE XYZ color system, respectively. x, y are coordinates in CIExy chromaticity space. The subscript indicates color.

For example, Y _w 800nits (cd/m) ² ) The color coordinates of the W frame are 0.307,0.321, the color coordinates of the R frame are 0.69,0.31, the color coordinates of the G frame are 0.39,0.68, and the color coordinates of the B frame are 0.132,0.062.

S120, determining the brightness of a plurality of sub-pictures based on the target optical parameters of the display panel.

Wherein the brightness of the plurality of sub-pictures includes the brightness of the first sub-picture (e.g., the brightness Y of R sub-picture _R ) The method comprises the steps of carrying out a first treatment on the surface of the For example, the brightness of the second sub-picture (e.g., the brightness Y of the G sub-picture) _G ) The method comprises the steps of carrying out a first treatment on the surface of the As another example, the luminance of the third sub-picture (e.g., luminance Y of the B sub-picture) _B )；Y _R 、Y _G And Y _B The following formula (1) may be satisfied:

wherein [ A ] is an intermediate matrix, and the following formula (2) can be satisfied:

X _w 、Y _w and Z _w The following formula (3) can be satisfied for the tristimulus value of the W picture:

in combination with the specific value given in S110, performing S120 may obtain the brightness (Y _R ) 169.9cd/m ² The brightness of the second sub-picture (Y _G ) 560.7cd/m ² The brightness of the third sub-picture (Y _B ) 69.4cd/m ² 。

S130, determining the theoretical driving current of the corresponding sub-pixel based on the brightness of each sub-picture.

Illustratively, in connection with FIG. 10, a theoretical drive current (e.g., in I) for the first subpixel 110_1 in the second group G2 is determined based on the luminance of the first sprite _R Representation), I _R The following formula (4) may be satisfied:

wherein P represents the transmittance of the polarizer, S represents the area of the display area (AA area) in the display panel, E _R The current Efficiency (Efficiency) of the R subpixel is represented.

For example, the current efficiency of the R sub-pixel is 30cd/A, P is 0.41, S is 0.031981m ² In combination with Y169.9 cd/m in S120 ² Obtain I _R 0.441754a.

Also illustratively, in connection with FIG. 10, a theoretical drive current (e.g., in I) for the second subpixel 110_2 in the second group G2 is determined based on the brightness of the second sprite _G Representation), I _G The following formula (5) may be satisfied:

wherein P represents the transmittance of the polarizer, S represents the area of the display area (AA area) in the display panel, E _G Indicating the current efficiency of the G subpixel.

For example, the G sub-pixel has a current efficiency of 128cd/A, P of 0.41, S of 0.031981m ² In combination with Y in S120 being 560.7cd/m ² Obtain I _G 0.341687a.

Compared with the related art, the beneficial effects of the method for determining the parameters of the display panel provided by the embodiments of the present disclosure refer to the beneficial effects of the display panel provided by the foregoing embodiments, and are not described herein in detail.

Referring to fig. 15, an embodiment of the present invention further provides a parameter determining apparatus 2 of a display panel, including: a memory 21 and a processor 22.

The memory 21 is configured to store a computer program. The processor 22 is configured to run the computer program to cause the parameter determination apparatus 2 of a display panel to execute the parameter determination method of a display panel as provided in any of the above embodiments.

The processor 22 may be one processor or may be a combination of a plurality of processing elements. For example, the processor 22 may be a general purpose central processing unit (central processing unit, CPU), microprocessor, application specific integrated circuit (application specific integrated circuit, ASIC), or one or more integrated circuits for controlling the execution of programs of the present disclosure, such as: one or more microprocessors. As another example, the processor 21 may be a programmable device; for example, the programmable device is a CPLD (Complex Programmable Logic Device ), an EPLD (Erasable Programmable Logic Device, erasable programmable logic device), or an FPGA (field-programmable gate array, field programmable gate array).

The memory 21 may be one memory or may be a collective term of a plurality of memory elements, and is used for storing executable program codes or the like. And memory 21 may comprise random access memory or may comprise non-volatile memory such as disk memory, flash memory, etc.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel having first and second edges opposite in a first direction, the display panel comprising:

a plurality of repeating unit columns located between the first edge and the second edge and sequentially arranged along the first direction; each repeating unit column comprises a plurality of repeating units arranged along a second direction, each repeating unit comprises a first sub-pixel and a second sub-pixel, wherein the light emitting colors of the first sub-pixel and the second sub-pixel are different, and the first sub-pixel is close to the first edge compared with the second sub-pixel; wherein the plurality of repeating unit columns are divided into a plurality of groups, each group including at least one repeating unit column; the plurality of groups includes: adjacent first and second sets, the first set being adjacent to the first edge; and

A plurality of first drive transistors, each first drive transistor coupled to one first subpixel in the first group;

a plurality of second drive transistors, each second drive transistor coupled to one of the first subpixels in the second group;

wherein the channel width-to-length ratio of at least one first drive transistor is less than the channel width-to-length ratio of one second drive transistor;

the first direction intersects the second direction.

2. The display panel of claim 1, wherein the display panel comprises,

the channel width to length ratios of the first drive transistors coupled to respective first sub-pixels of a same column of the repeating units in the first group are all equal; and/or the number of the groups of groups,

the channel width to length ratios of the second drive transistors coupled to the respective first subpixels of the same repeating unit column in the second group are all equal.

3. The display panel according to claim 1 or 2, wherein,

the first subpixel is configured to emit red light;

the channel width-to-length ratio of the at least one first driving transistor is 0.7-0.8 times that of the second driving transistor.

4. The display panel of claim 1, wherein the display panel comprises,

The first driving transistor and the second driving transistor with different channel width-to-length ratios have the same channel width or channel length.

5. The display panel of claim 1, wherein the display panel comprises,

the plurality of groups further includes: a third group located on a side of the second group remote from the first group and adjacent to the second edge;

the display panel further includes: a plurality of third drive transistors, each third drive transistor coupled to one of the second sub-pixels in the third group, and a plurality of fourth drive transistors, each fourth drive transistor coupled to one of the second sub-pixels in the second group;

the channel width-to-length ratio of the at least one third drive transistor is smaller than the channel width-to-length ratio of the at least one fourth drive transistor.

6. The display panel of claim 5, wherein the display panel comprises,

the channel width-to-length ratios of the third drive transistors coupled to respective second sub-pixels of the same repeating unit column in the third group are all equal; and/or the number of the groups of groups,

the fourth drive transistors coupled to respective second subpixels of the same column of repeating units in the second group have equal channel width to length ratios.

7. The display panel according to claim 5 or 6, wherein,

The second subpixel is configured to emit green light;

the channel width-to-length ratio of the at least one third driving transistor is 0.8-0.9 times that of the fourth driving transistor.

8. The display panel of claim 5, wherein the display panel comprises,

and the channel width or the channel length of the third driving transistor and the channel width of the fourth driving transistor with different channel width-length ratios are the same.

9. The display panel of claim 1, wherein the display panel comprises,

the repeating unit further includes: and a third sub-pixel, wherein the third sub-pixel is different from the first sub-pixel and the second sub-pixel in luminous color, and the third sub-pixel is opposite to the first sub-pixel and the second sub-pixel along the second direction.

10. A display device, comprising:

the display panel of any one of claims 1 to 9.

11. A method for determining parameters of a display panel, wherein the display panel is the display panel according to any one of claims 1 to 9, and the method for determining parameters of the display panel comprises:

determining a theoretical drive current of a first subpixel in a second group of the display panel when the display panel is in a white balance state;

Determining a channel width to length ratio of a second drive transistor in the display panel based on the theoretical drive current of the first sub-pixel in the second group;

and obtaining the channel width-to-length ratio of the first driving transistor in the display panel based on the channel width-to-length ratio of the second driving transistor.

12. The method for determining parameters of a display panel according to claim 11, further comprising:

a ratio between a channel width-to-length ratio of a first driving transistor in the display panel and a channel width-to-length ratio of the second driving transistor is determined, so that the channel width-to-length ratio of the first driving transistor in the display panel is calculated based on the channel width-to-length ratio of the second driving transistor and the ratio.

13. The method for determining parameters of a display panel according to claim 11, wherein,

the plurality of groups of display panels further include: a third group located on a side of the second group remote from the first group and adjacent to the second edge; the display panel further includes: a plurality of third drive transistors, each third drive transistor coupled to one of the second sub-pixels in the third group, and a plurality of fourth drive transistors, each fourth drive transistor coupled to one of the second sub-pixels in the second group;

The parameter determining method of the display panel further comprises the following steps:

determining a theoretical drive current for a second subpixel in a second group of the display panel when the display panel is in a white balance state;

determining a channel width to length ratio of a fourth drive transistor in the display panel based on a theoretical drive current of a second subpixel in a second group of display panels;

and obtaining the channel width-to-length ratio of the third driving transistor in the display panel based on the channel width-to-length ratio of the fourth driving transistor.

14. The method for determining parameters of a display panel according to claim 13, wherein,

determining a theoretical drive current of a first subpixel in a second group of the display panel when the display panel is in a white balance state; and determining a theoretical drive current for a second subpixel in a second group of the display panel in a white balance state of the display panel comprises:

obtaining target optical parameters of the display panel, wherein the target optical parameters comprise: the display panel displays the brightness of a white picture in a white balance state, wherein the color coordinates of the white picture are the color coordinates of a first sub-picture, a second sub-picture and a third sub-picture in the white picture; the colors of the first sub-picture, the second sub-picture and the third sub-picture are respectively the same as the luminous colors of the first sub-pixel, the second sub-pixel and the third sub-pixel in the display panel;

Determining the brightness of the first sub-picture and the brightness of the second sub-picture based on the target optical parameters of the display panel;

determining a theoretical drive current for a first subpixel in the second group based on the luminance of the first subpixel; a theoretical drive current for a second subpixel in the second group is determined based on the luminance of the second sprite.

15. A parameter determining apparatus for a display panel, comprising:

a memory configured to store a computer program; and

a processor configured to run the computer program to cause the parameter determination device of the display panel to perform the parameter determination method of the display panel according to any one of the preceding claims 11 to 14.