Display panel testing method and testing device, and display device

Abstract

The embodiment of the present invention provides a display panel test method and a test device, and a display device, which relate to the field of display technology and are used to improve the color deviation phenomenon of the display device under a side viewing angle. The display panel test method includes outputting a first data signal to the display panel, so that the display panel displays a first white picture, and the color coordinates under a positive viewing angle meet the white balance condition, testing the color coordinates of the first white picture under a first side viewing angle, and obtaining a first color deviation value. When the first color deviation value does not meet the color deviation condition, the following steps are performed: outputting a second data signal to the display panel, so that the display panel displays a second white picture, and the color coordinates under a second side viewing angle meet the white balance condition, testing the color coordinates of the second white picture under the first side viewing angle and the color coordinates under the positive viewing angle, and obtaining a second color deviation value and a third color deviation value; until the second color deviation value and the third color deviation value meet the color deviation condition, the corresponding second side viewing angle is used as the target side viewing angle.

Description

Technical Field

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

[0002] The use scenarios of display devices, such as organic light-emitting diode (OLED) display devices, are becoming more and more diverse. For example, OLED display devices can be used as vehicle-mounted display devices (such as central control display screens, instrument display screens, etc.).

[0003] See also Figure 1 When using a vehicle, a user (such as a driver) usually views the vehicle-mounted display device from a certain side view angle. Figure 1 As shown in (a), the central control display screen is usually set in the center of the vehicle dashboard, and the driving seat of the vehicle is usually located on one side of the vehicle, that is, the central control display screen is usually located on the side of the driving seat. When the vehicle is in use, the driver will view the central control display screen at a certain side viewing angle. For another example, the instrument display screen is usually set on the side of the vehicle dashboard close to the driving seat. When the vehicle is in use, the instrument display screen is usually located diagonally below the driver's eyes, and the driver will also view the instrument display screen at a certain side viewing angle. However, at the side viewing angle, the picture displayed by the OLED display device has a color cast phenomenon. Summary of the invention

[0004] Embodiments of the present invention provide a display panel testing method and testing device, and a display device, which are used to test color shift influencing parameters of the display panel, so as to improve the color shift phenomenon of the display device under a side viewing angle.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0006] In a first aspect, a method for testing a display panel is provided, comprising:

[0007] Outputting a first data signal to the first display panel so that the first display panel displays a first white picture in at least a partial area thereof, wherein the color coordinates of the first white picture at a normal viewing angle meet a white balance condition;

[0008] Testing the color coordinates of the first white picture at a first side viewing angle, and obtaining a first color deviation value, where the first color deviation value represents the degree of difference between the color coordinates of the first white picture at the first side viewing angle and the color coordinates of the first white picture at a front viewing angle;

[0009] When the first color deviation value does not satisfy the color deviation condition, the following steps are performed at least once:

[0010] Outputting a second data signal to the first display panel so that the first display panel displays a second white picture in at least a partial area thereof, wherein the color coordinates of the second white picture at a second side viewing angle meet a white balance condition; and the second side viewing angle is between the front viewing angle and the first side viewing angle;

[0011] Testing the color coordinates of the second white picture at the first side viewing angle and the color coordinates of the second white picture at the front viewing angle, and obtaining a second color deviation value and a third color deviation value; until both the second color deviation value and the third color deviation value satisfy the color deviation condition, taking the corresponding second side viewing angle as the target side viewing angle;

[0012] Among them, the second color deviation value represents the difference between the color coordinates of the second white picture at the first side viewing angle and the color coordinates of the second white picture at the second side viewing angle, and the third color deviation value represents the difference between the color coordinates of the second white picture at the front viewing angle and the color coordinates of the second white picture at the second side viewing angle.

[0013] In some embodiments, the first side-view angle is a value in a first angle range, and the first angle range is a horizontal angle H: ±50°; a vertical angle V: +20 / -10°.

[0014] In some embodiments, the display panel testing method further includes testing a viewing angle of the display panel from a side viewing position, and the viewing angle obtained by the test is used as a first side viewing angle or a second side viewing angle.

[0015] In some embodiments, the display panel testing method further includes: if multiple target side viewing angles are determined, selecting one from the multiple target side viewing angles.

[0016] In some embodiments, the range of the brightness ratios of the plurality of primary colors of the first display panel is less than or equal to a threshold value, wherein the brightness ratio of each primary color is the ratio of the brightness of the primary color picture at the first side viewing angle to the brightness of the primary color picture at the front viewing angle when the first display panel displays the corresponding primary color picture.

[0017] In some embodiments, the first display panel includes a first primary color light emitting device, a second primary color light emitting device, and a third primary color light emitting device, wherein the resonance cavity length of the first primary color light emitting device is 250nm to 300nm, the resonance cavity length of the second primary color light emitting device is 150nm to 200nm, and the resonance cavity length of the third primary color light emitting device is 200nm to 250nm.

[0018] In some embodiments, the display panel testing method further includes:

[0019] Outputting a third data signal to the second display panel so that the second display panel displays a third white picture in at least a partial area thereof, wherein the color coordinates of the third white picture at a normal viewing angle meet a white balance condition; wherein the second display panel comprises: light emitting devices of multiple primary colors;

[0020] Testing the color coordinates of the third white picture at the first side viewing angle, and obtaining a fourth color deviation value, where the fourth color deviation value represents the degree of difference between the color coordinates of the third white picture at the first side viewing angle and the color coordinates of the third white picture at the front viewing angle;

[0021] When the fourth color deviation value does not meet the color deviation condition, the resonance cavity length of the light-emitting device of at least one primary color in the second display panel is adjusted, and the range of the brightness ratios of the multiple primary colors of the second display panel after adjustment is determined; if the range of the brightness ratios of the multiple primary colors of the second display panel is less than or equal to the threshold, the second display panel is the first display panel; otherwise, return to the step of adjusting the resonance cavity length of the light-emitting device of at least one primary color in the second display panel.

[0022] In a second aspect, a display panel testing device is provided, including a first output module, a first testing module, a second output module, a second testing module, and a first control module.

[0023] A first output module is configured to output a first data signal to the first display panel, so that the first display panel displays a first white picture in at least a partial area thereof, and the color coordinates of the first white picture at a normal viewing angle meet a white balance condition;

[0024] A first testing module is configured to test the color coordinates of the first white picture at a first side viewing angle, and obtain a first color deviation value, wherein the first color deviation value represents a difference between the color coordinates of the first white picture at the first side viewing angle and the color coordinates of the first white picture at a front viewing angle;

[0025] a second output module configured to output a second data signal to the first display panel, so that the first display panel displays a second white picture in at least a partial area thereof, and the color coordinates of the second white picture at a second side viewing angle meet a white balance condition; the second side viewing angle is between the front viewing angle and the first side viewing angle;

[0026] A second testing module is configured to test the color coordinates of the second white picture at the first side viewing angle and the color coordinates of the second white picture at the front viewing angle, and obtain a second color deviation value and a third color deviation value; wherein the second color deviation value represents the difference between the color coordinates of the second white picture at the first side viewing angle and the color coordinates of the second white picture at the second side viewing angle, and the third color deviation value represents the difference between the color coordinates of the second white picture at the front viewing angle and the color coordinates of the second white picture at the second side viewing angle;

[0027] The first control module is configured to control the second output module and the second test module to execute corresponding steps when the first color deviation value does not meet the color deviation condition, until the second color deviation value and the third color deviation value both meet the color deviation condition, and use the corresponding second side view angle as the target side view angle.

[0028] In some embodiments, the display panel testing device further includes a third output module, a third testing module, an adjustment module, and a second control module.

[0029] A third output module is configured to output a third data signal to the second display panel, so that the second display panel displays a third white picture in at least a part of its area, and the color coordinates of the third white picture at a normal viewing angle meet the white balance condition; wherein the second display panel includes light-emitting devices of multiple primary colors;

[0030] A third testing module is configured to test the color coordinates of the third white picture at the first side viewing angle, and obtain a fourth color deviation value, wherein the fourth color deviation value represents a degree of difference between the color coordinates of the third white picture at the first side viewing angle and the color coordinates of the third white picture at the front viewing angle;

[0031] an adjustment module configured to adjust the resonant cavity length of the light emitting device of at least one primary color in the second display panel, and determine the range of the brightness ratios of the plurality of primary colors of the second display panel after adjustment;

[0032] The second control module is configured to control the adjustment module to execute corresponding steps when the fourth color deviation value does not meet the color deviation condition. If the extreme difference of the brightness ratios of the multiple primary colors of the second display panel is less than or equal to the threshold, the second display panel is the first display panel; otherwise, the control adjustment module returns to execute the step of adjusting the resonance cavity length of the light-emitting device of at least one primary color in the second display panel.

[0033] In a third aspect, a testing device for a display panel is provided, comprising: a memory and a processor, wherein the memory is configured to store computer program instructions, and the processor is configured to execute computer program instructions, so that the testing device for the display panel executes the testing method for the display panel provided in any embodiment.

[0034] In a fourth aspect, a display device is provided, comprising a display panel and a display control device, wherein the display control device is configured to provide a data signal to the display panel so that the display panel displays a white image in at least a portion of its area, and the color coordinates of the white image under a side viewing angle meet a white balance condition.

[0035] In some embodiments, the display panel includes a first primary color light emitting device, a second primary color light emitting device, and a third primary color light emitting device, wherein the resonance cavity length of the first primary color light emitting device is 250nm to 300nm, the resonance cavity length of the second primary color light emitting device is 150nm to 200nm, and the resonance cavity length of the third primary color light emitting device is 200nm to 250nm.

[0036] In a fifth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer program instructions. When the computer program instructions are executed on a computer, the computer implements the display panel testing method provided by any embodiment.

[0037] The display panel testing method provided in an embodiment of the present invention can test the color deviation influencing parameters of the display panel. For example, through this method, a target side viewing angle that is more suitable for a certain display panel can be selected, and the display panel can be further adjusted using the target side viewing angle, which can improve the color deviation phenomenon of the display device under the side viewing angle.

[0038] It can be understood that the display panel testing devices provided in the second and third aspects can execute the display panel testing method, the display device provided in the fourth aspect may include a display panel tested using the above-mentioned display panel testing method, and the computer-readable storage medium provided in the fifth aspect can execute the above-mentioned display panel testing method. The beneficial effects that can be achieved can be referred to the beneficial effects of the display panel testing method above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A schematic diagram of a user viewing the vehicle-mounted display device at a certain side viewing angle during use of the vehicle;

[0041] Figure 2 is a schematic diagram of a rectangular coordinate system used to represent the viewing angle on a display panel;

[0042] Figure 3 Schematic diagram of the parameter representation of the viewing angle;

[0043] Figure 4 This is a schematic diagram of the viewing angle area involved in European vehicle regulations;

[0044] Figure 5A schematic diagram showing the requirements for viewing angle brightness and viewing angle color deviation in each viewing angle area;

[0045] Figure 6 is a schematic diagram showing the result of the brightness of the picture attenuating as the viewing angle changes when the display device displays a red picture, a green picture, and a blue picture respectively;

[0046] Fig. 7A is a schematic diagram showing the shift of the spectrum of a red screen of a display device with the viewing angle;

[0047] Figure 7B is a schematic diagram showing the shift of the spectrum of a green screen of a display device with the viewing angle;

[0048] Figure 7C is a schematic diagram showing the shift of the spectrum of a blue screen of a display device with the viewing angle;

[0049] Figure 8 A schematic diagram showing the change of color coordinates of a white picture, a red picture, a green picture, and a blue picture displayed on a display panel as the viewing angle changes;

[0050] Fig. 9 A structural diagram of a display device provided by an embodiment of the present invention;

[0051] Fig.10 A structural diagram of a light-emitting device in a display device provided by an embodiment of the present invention;

[0052] Fig.11A A schematic diagram showing changes in the brightness ratio of each primary color of a display panel;

[0053] Fig. 11B is a schematic diagram of changes in the brightness ratio of each primary color of another display panel;

[0054] Fig. 11C is a schematic diagram showing changes in the brightness ratio of each primary color of another display panel;

[0055] Fig. 12A A schematic diagram showing the degree of color deviation of a white picture displayed by a display panel when the white picture meets the white balance condition at a normal viewing angle as the viewing angle changes;

[0056] Fig. 12B A schematic diagram showing the degree of color deviation of a white picture displayed by a display panel as the viewing angle changes when the white picture meets a white balance condition at a side viewing angle;

[0057] Fig. 12C A schematic diagram showing the degree of color deviation of a white picture displayed by a display panel as the viewing angle changes when the white picture meets a white balance condition at another side viewing angle;

[0058] Fig.13A flow chart of a display panel testing method provided by an embodiment of the present invention;

[0059] Fig.14 A structural diagram of a display panel testing device provided by an embodiment of the present invention;

[0060] Fig.15 A structural diagram of another display panel testing device provided by an embodiment of the present invention;

[0061] Fig.16 A structural diagram of yet another display panel testing device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0064] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0065] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0066] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0067] “At least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and both include the following combinations of A, B, and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0068] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0069] "Plurality" means at least two.

[0070] The use of "adapted to" or "configured to" herein is meant to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0071] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0072] As used herein, "about," "approximately," or "substantially" includes the stated value and an average value that is within an acceptable range of variation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0073] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0074] First, the technical terms involved in this article are schematically explained.

[0075] 1. Viewing angle: indicates the direction from which the user views the display panel.

[0076] See also Figure 2 , point O may be a point in the AA area of ​​the display panel (the AA area is, for example, the display area of ​​the display panel), for example, it may be the center point of the AA area, or it may be any point other than the center point. Exemplarily, a spatial rectangular coordinate system is established with point O as the origin, a direction perpendicular to the display surface of the display panel as the z-axis, and a direction parallel to an edge of the AA area of ​​the display panel as the y-axis.

[0077] Assuming that the position of the human eye is point C, the line connecting point O and point C represents the line of sight of the human eye viewing the display panel (hereinafter referred to as line of sight OC), which has a viewing angle. This article uses parameters θ and φ to represent a viewing angle. For example, the viewing angle of line of sight OC is recorded as OC(θ1, φ1), θ1 is the angle between line of sight OC and the z-axis, φ1 is the angle of OC1 rotated counterclockwise from the positive direction of the x-axis, and OC1 is the orthographic projection of OC on the xy plane. Among them, the range of θ is 0° to 90°. The range of φ is 0° to 360°. For another example, the viewing angle of line of sight OB is recorded as OB(θ2, φ2), θ2 is the angle between line of sight OB and the z-axis, φ2 is the angle of OB1 rotated counterclockwise from the positive direction of the x-axis, and OB1 is the orthographic projection of OB on the xy plane. It should be noted that the distances between point B and point C and the xy plane are equal, that is, the line connecting point B and point C is parallel to the xy plane.

[0078] In addition, to express the viewing angle on the xy plane, we can use Figure 3 The circles in represent the parameters θ. Figure 3 is a parameter representation graph of viewpoints, where each point in the graph can represent a viewpoint. For example, Figure 2 The viewing angle OC(θ1, φ1) of the central line of sight OC can be expressed as Figure 3 Point C in the figure represents the angle OB (θ2, φ2) of the line of sight OB, which can be expressed as Figure 3 Point B in the figure represents that φ1=φ2.

[0079] 2. Positive angle of view: Figure 2 In , the viewing angle of the line of sight parallel to the z-axis is the positive viewing angle, which means that the user is viewing directly in front of the display panel. Figure 3 In the figure, the origin O represents the normal viewing angle, which can be recorded as 0°.

[0080] 3. Side view: Figure 2 In the example, the viewing angle of the line of sight that is not parallel to the z-axis is the side viewing angle, which means that the user is viewing the display panel along the side viewing direction. Figure 3 In the figure, all points except the origin O represent a side view angle, which can be recorded as (θ, φ).

[0081] 4. Viewing area and viewing range: The viewing area refers to an area in the parameter representation diagram of the viewing angle. The values ​​of all points (i.e., viewing angles) in the viewing area constitute the viewing range. For example, the viewing area can be a rectangle or a quasi-rectangle. In this case, the viewing range can be defined by the horizontal angle H and the vertical angle V. The horizontal angle H is θ in the x-axis direction, with the positive direction of the x-axis being positive and the negative direction of the x-axis being negative; the vertical angle V is θ in the y-axis direction, with the positive direction of the y-axis being positive and the negative direction of the y-axis being negative.

[0082] The viewing angles involved in European vehicle regulations include: A+ viewing angle area, A viewing angle area, and B viewing angle area. Figure 4 , Figure 4 (a) shows the A+ viewing angle area, and its viewing angle range is horizontal angle H: ±10°, vertical angle V: +8° / -4°; Figure 4 The viewing angle area A shown in (b) has a viewing angle range of horizontal angle H: ±40° and vertical angle V: +20° / -10°; Figure 4 The B viewing angle area shown in (c) has a viewing angle range of horizontal angle H: ±50° and vertical angle V: +20° / -10°.

[0083] 5. Chromatic coordinates (also called color coordinates): If you want to describe the color qualitatively and quantitatively, establish a color coordinate system, that is, a colorimetric system. Chromatic coordinates are the coordinate values ​​under the colorimetric system.

[0084] In some embodiments, the CIE XYZ system (XYZ color system) can be used to describe the characteristics of monochromatic light. Red, blue, and green can be called three primary colors. Exemplarily, red light is recorded as R, and the tristimulus values ​​of red light R are, for example, (X [R] , Y [R] , Z [R] ), the green light is recorded as G, and the tristimulus value of the green light G is, for example, (X [G] , Y [G] , Z [G] ), blue light is recorded as B, and the tristimulus value of blue light B is, for example, (X [B] , Y [B] , Z [B] ).

[0085] According to the additive color mixing theory, mixing red light R, green light G, and blue light B can produce white light W. The three stimulus values ​​of white light (denoted as W) obtained by mixing the three primary colors of R, G, and B satisfy:

[0086] X {W} =X [R] +X [G] +X [B]

[0087] Y {W} =Y [R] +Y [G] +Y [B]

[0088] Z {W} =Z [R] +Z [G] +Z [B]

[0089] Among them, X [R] , Y [R] , Z[R] is the tristimulus value of red light R used to mix white light W. [G] , Y [G] , Z [G] is the tristimulus value of green light G used to mix white light W. [B] , Y [B] , Z [B] are the tristimulus values ​​of blue light B used to mix white light W.

[0090] The above formula is written in matrix form as:

[0091]

[0092] Y [R] ,Y [G] and Y [B] The inverse matrix can be used to find:

[0093]

[0094] In the CIE XYZ system, the value of Y represents the luminous flux. Then, the proportion of the brightness of R, G, and B to the brightness of white light W is Y [R] / Y {W} ,Y [G] / Y {W} and Y [B] / Y {W} . That is, the brightness L of white light W {W} =Y [R] +Y [G] +Y [B] , the brightness L of white light W {W} It is the sum of the brightness of the three primary colors R, G, and B.

[0095] The color coordinates of white light W can be obtained using the following formula:

[0096]

[0097]

[0098]

[0099] It can be seen that the color coordinates of the white light W are related to the brightness and color coordinates of the red light R, the green light G, and the blue light B.

[0100] For a display device, such as an OLED display device, it may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel. According to the above theory, the red sub-pixel of the OLED display device can emit red light, the green sub-pixel emits green light, and the blue sub-pixel emits blue light, and by controlling the different ratios between the brightness of the red light, the brightness of the green light, and the brightness of the blue light, the OLED display device can display different pictures, for example, the OLED display device can display a white picture. Accordingly, the color coordinates of the white picture displayed by the OLED display device are directly related to the brightness and color coordinates of the red light R, the green light G, and the blue light B emitted by the three primary color sub-pixels respectively.

[0101] In other embodiments, the color may be represented by a CIE LUV chromaticity diagram. For example, the chromaticity diagram may be a CIE1976-LUV chromaticity diagram, where the color coordinates are u' and v'. The chromaticity diagram may also be a CIE1960-LUV chromaticity diagram, where the color coordinates are u and v. The color coordinates u'v' and the color coordinates uv satisfy the following formula:

[0102]

[0103]

[0104] Where xy is the color coordinate in the 1931 color space CIE (x, y).

[0105] 6. Color shift and color shift value: When a display device displays a picture (for example, a pure color picture, which can be a primary color picture such as red, blue, green, or a white picture), if the user watches it from a certain viewing angle compared to a reference viewing angle (for example, a normal viewing angle), the color of the picture will deviate, that is, a color shift phenomenon will occur.

[0106] The color deviation value is used to characterize the degree of color deviation of the picture displayed by the display device, and is specifically used to characterize the degree of difference between the color coordinates of the picture displayed by the display device at a certain viewing angle and the color coordinates of the picture at a reference viewing angle (e.g., normal viewing angle). For example, the color deviation value may be Δu'v' or JNCD (Just Noticeable Color Difference).

[0107] Where, Δu'v'=[(u' i -u'5) 2 +(v' i -v'5) 2 ] 0.5 ; JNCD = Δu'v' / 0.004.

[0108] In the above formula, u'5 and v'5 are the color coordinates of the picture (for example, white picture) displayed by the display device at the reference viewing angle, u' i and v' i is the color coordinate of the picture displayed by the display device at viewing angle i.

[0109] European automotive regulations (Display Specification for Automotive Application, Version 5.0) have strict requirements on the brightness and color deviation of the white screen of the vehicle display device at certain viewing angles. In addition, in order to meet the performance requirements of the vehicle display device in different usage scenarios, further requirements are put forward on the brightness and color deviation of the white screen of the vehicle display device at certain viewing angles based on the European automotive regulations. Figure 5 The requirements for viewing angle brightness and viewing angle color deviation in each viewing angle area are shown.

[0110] Based on this, see Figure 5 For brightness, it is hoped that the brightness of the white screen displayed by the vehicle display device in the A+ viewing area shall not be less than 90% of the brightness of the normal viewing area; the brightness in the A viewing area shall not be less than 45% of the brightness of the normal viewing area; and the brightness in the B viewing area shall not be less than 30% of the brightness of the normal viewing area. As for the degree of color deviation, it is hoped that the JNCD in the B viewing area is ≤5 (it can be said that the degree of color deviation is ≤5JNCD).

[0111] However, at a side viewing angle, for example, the image displayed by the OLED display device has a color shift phenomenon. For example, when the OLED display device displays a white image, there is a certain difference between the color coordinates of the white image at a front viewing angle and the color coordinates of the white image at a side viewing angle. When the OLED display device can also be used as a vehicle display device, since the user (such as the driver) usually views the vehicle display device at a certain side viewing angle, the above color shift problem becomes more obvious.

[0112] Below, we will take the scene where the OLED display device displays a white picture as an example to explain why the picture displayed by the OLED display device has color shift under the side viewing angle. It can be understood that under the side viewing angle, the OLED display device will have a color shift problem when displaying any picture, and its principle is the same as the color shift problem of the white picture.

[0113] When the OLED display device displays a white picture, with the front viewing angle as a reference, as the viewing angle gradually changes, for example, θ gradually increases, the brightness attenuation degrees of the red light R, green light G and blue light B emitted by the three primary color sub-pixels of the OLED display device, such as the red sub-pixel, the green sub-pixel, and the blue sub-pixel, respectively, are inconsistent. This is one of the reasons why the picture displayed by the OLED display device has a color cast phenomenon under a side viewing angle.

[0114] Figure 6 The results of the attenuation of the brightness of the images as the viewing angle changes when the OLED display device displays a red image, a green image, and a blue image respectively are shown. This result can be used to characterize the attenuation of the brightness of the red light, green light, and blue light emitted by the red sub-pixel, green sub-pixel, and blue sub-pixel of the OLED display device as the viewing angle changes when the OLED display device displays a white image. For example, Figure 6 As shown, the brightness of the red picture, the green picture, and the blue picture are all 100% at the positive viewing angle, but when the viewing angle changes to the side viewing angle 3 (51.3°, 343°), the brightness of the red picture, the green picture, and the blue picture decay to 51%, 34%, and 27% respectively (the extreme difference is 24%). It can be seen that the red light emitted by the red sub-pixel of the OLED display device, the green light emitted by the green sub-pixel, and the blue light emitted by the blue sub-pixel vary with the viewing angle, and the degree of brightness attenuation is inconsistent. This will cause the ratio of the brightness of the three primary colors in the white picture displayed by the OLED display panel at the positive viewing angle to be different from the ratio of the brightness of the three primary colors in the white picture at the side viewing angle. For example, at the positive viewing angle, the brightness ratio of the three primary colors is 1:1:1, however, at the side viewing angle 3, the brightness ratio of the three primary colors is 51:34:27. Due to the different brightness of the three primary colors, the color of the picture mixed by the three primary colors is different, resulting in a color cast phenomenon.

[0115] In addition, as described above, the color coordinates of the white screen displayed by the OLED display device are directly related to the color coordinates of the red light R, green light G, and blue light B emitted by the three primary color sub-pixels. Fig. 7A , Figure 7B ,as well as Figure 7C ,in, Fig. 7A The spectrum of the red image shifts with the viewing angle. Figure 7B The spectrum of the green screen shifts with the viewing angle. Figure 7C The shift of the spectrum of the blue picture with the viewing angle is shown; Figure 8 The figure shows the change results of the color coordinates of the white picture (i.e., white picture W), red picture R, green picture G, and blue picture B displayed by the OLED display panel as the viewing angle changes. It can be seen that when the OLED display device displays red, green, and blue monochrome pictures respectively, with the positive viewing angle as the reference, as the viewing angle gradually changes, for example, θ gradually increases, the spectral peaks of the red, green, and blue monochrome pictures will be greatly displaced, resulting in the color coordinates of the red light, green light, and blue light emitted by the OLED display device being offset by different amplitudes, which in turn causes the white picture displayed by the OLED display device to have a color cast at the side viewing angle. This is another reason why the picture displayed by the OLED display device has a color cast at the side viewing angle.

[0116] As described above, the reasons why the image displayed by the OLED display device has color shift at a side viewing angle may include:

[0117] Taking the normal viewing angle as the reference, as the viewing angle gradually changes, for example, θ gradually increases, the brightness attenuation of the various primary colors of light emitted by the various primary color sub-pixels of the OLED display device (for example, red light, green light, and blue light emitted by the red sub-pixel, the green sub-pixel, and the blue sub-pixel, respectively) is inconsistent. Also, as the viewing angle gradually changes, the color coordinates of the various primary colors of light (for example, red light, green light, and blue light) emitted by the OLED display device will shift by different magnitudes. This is caused by the OLED light-emitting device itself. The prior art has adopted a variety of methods to try to solve this problem, but the results are not ideal.

[0118] Based on this, in order to solve the color shift problem of the picture displayed by the OLED display device under the side viewing angle, some embodiments of the present invention provide a display device.

[0119] The display device is a product with an image display function, such as: a monitor, a television, a billboard, a digital photo frame, a laser printer with a display function, a telephone, a mobile phone, a personal digital assistant (PDA), a digital camera, a portable camcorder, a viewfinder, a navigator, a vehicle, a large-area wall, a home appliance, an information query device (such as business query equipment for e-government, banks, hospitals, power departments, etc.), a monitor, etc.

[0120] See also Fig. 9 In some embodiments, the display device 100 includes a display panel 110 and a display control device 120 .

[0121] The display panel 110 may be an OLED (Organic Light Emitting Diode) display panel, a QLED (Quantum Dot Light Emitting Diodes) display panel, an LCD (Liquid Crystal Display) display panel, a micro LED (including: miniLED or microLED, LED is a light emitting diode) display panel, etc.

[0122] In some embodiments, the display panel 110 is an OLED display panel.

[0123] In some embodiments, the display panel 110 may include light emitting devices of multiple primary colors. For example, the display panel 110 may include a first primary color light emitting device, a second primary color light emitting device, and a third primary color light emitting device. The first primary color is, for example, red, the second primary color is, for example, green, and the third primary color is, for example, blue.

[0124] In some embodiments, in the display panel 110, the light emitting device is a top emission type OLED. Fig.10 , the light emitting device 200 may include an anode 230, a cathode 210, and an organic functional layer 220. The anode 230 is, for example, a reflective anode, and the cathode 210 is, for example, a semi-reflective cathode. At this time, a resonant cavity may be formed between the anode 230 and the cathode 210 of the light emitting device 200. Specifically, a resonant cavity is formed between two reflective surfaces facing each other in the anode 230 and the cathode 210. For example, the anode 230 may include an ITO layer 231, an Al layer 232, and an ITO layer 233 that are stacked in sequence. The cathode 210 may be a metal or a metal alloy, for example, an Ag layer. At this time, the distance L between the Al layer 232 and the cathode 210 is the cavity length of the resonant cavity, that is, the resonant cavity length.

[0125] In some embodiments, in the display panel 110, the resonance cavity length of the first primary color light emitting device is 250nm-300nm, the resonance cavity length of the second primary color light emitting device is 150nm-200nm, and the resonance cavity length of the third primary color light emitting device is 200nm-250nm. Exemplarily, the resonance cavity length of the first primary color light emitting device of the display panel 110 may be 250nm, 260nm, 270nm, 280nm, 290nm or 300nm; the resonance cavity length of the second primary color light emitting device may be 150nm, 160nm, 170nm, 180nm, 190nm or 200nm; the resonance cavity length of the third primary color light emitting device may be 200nm, 210nm, 220nm, 230nm, 240nm, or 250nm.

[0126] As described above, one of the reasons why the image displayed by the OLED display device has color shift at the side viewing angle is that, based on the front viewing angle, as the viewing angle gradually changes, for example, θ gradually increases, the brightness attenuation of the multiple primary colors of light (for example, red sub-pixels, green sub-pixels, and blue sub-pixels, respectively emitting red light, green light, and blue light) emitted by the multiple primary color sub-pixels of the OLED display device is inconsistent, so that the ratio of the brightness of each primary color light at the side viewing angle changes compared to the ratio of the brightness of each primary color light at the front viewing angle, thereby causing the color shift phenomenon at the side viewing angle. By adjusting the resonance cavity length of the multiple primary color light emitting devices of the display panel, the attenuation degree of the brightness of the multiple primary colors of light emitted by the multiple primary color sub-pixels as the viewing angle changes can be controlled.

[0127] Among them, with the front viewing angle as the reference, as the viewing angle gradually changes, the brightness attenuation degree of the light emitted by each primary color sub-pixel can be characterized by the brightness ratio of each primary color. The brightness ratio of a primary color is, for example, the ratio of the brightness of the primary color picture at a certain side viewing angle to the brightness of the primary color picture at the front viewing angle when the display panel displays the corresponding primary color picture, which can be used to characterize the attenuation degree of the brightness of the primary color picture at the side viewing angle compared to the brightness at the front viewing angle. Exemplarily, for the display panel 110, when the viewing angle changes from the front viewing angle to the side viewing angle, the brightness ratio of the first primary color can be: the ratio of the brightness of the pure color picture of the first primary color displayed by the display panel 110 at the side viewing angle to the brightness of the pure color picture of the first primary color displayed by the display panel 110 at the front viewing angle, which can be used to characterize the attenuation degree of the brightness of the first primary color picture with the change of the viewing angle when the viewing angle changes from the front viewing angle to the side viewing angle. Since the brightness of the picture displayed by the display panel 110 is attenuated as the viewing angle gradually changes, the value range of the brightness ratio of a primary color picture is 0 to 1.

[0128] Taking the front viewing angle as a reference, as the viewing angle gradually changes, the attenuation degree of the brightness of the light emitted by each primary color sub-pixel is closer, and the brightness ratio of each primary color is closer at the front viewing angle and each side viewing angle. In this way, the color deviation of the primary color image at the side viewing angle is smaller.

[0129] By adjusting the resonant cavity lengths of the multiple primary color light emitting devices of the display panel 110, the attenuation of the brightness of the multiple primary colors of light emitted by the multiple primary color sub-pixels as the viewing angle changes can be controlled, thereby reducing the extreme difference in the brightness ratio of the multiple primary colors of the display panel 110. In this way, the purpose of reducing the color cast of the display image at the side viewing angle can be achieved.

[0130] It should be noted that the range of a set of data is the value obtained by subtracting the minimum value from the maximum value in the set of data, which can be used to evaluate the discreteness of the set of data. Exemplarily, the range of the brightness ratio of the first primary color, the brightness ratio of the second primary color, and the brightness ratio of the third primary color is the value obtained by subtracting the maximum value from the minimum value in the brightness ratio of the first primary color, the brightness ratio of the second primary color, and the brightness ratio of the third primary color, which can be used to evaluate the discreteness of the brightness ratio of the first primary color, the brightness ratio of the second primary color, and the brightness ratio of the third primary color. When the range of the brightness ratios of the multiple primary colors of the display panel is smaller, the attenuation degree of the brightness of the light emitted by each primary color sub-pixel of the display panel is more similar as the viewing angle changes, that is, compared with the ratio between the brightness of the multiple primary colors at the front viewing angle, at a certain side viewing angle, the smaller the change in the ratio between the brightness of the multiple primary colors is, the smaller the color deviation is.

[0131] For example, Fig.11A , Fig. 11B ,as well as Fig. 11C The figure shows the change of the brightness ratio of each primary color after adjusting the resonance cavity length of each primary color sub-pixel of the display panel 110 . Fig.11A The corresponding results are shown when the resonance cavity length of the first primary color light emitting device is 300nm-350nm, the resonance cavity length of the second primary color light emitting device is 250nm-300nm, and the resonance cavity length of the third primary color light emitting device is 200nm-250nm; Fig. 11B The corresponding results are shown when the resonance cavity length of the first primary color light emitting device is 250nm-300nm, the resonance cavity length of the second primary color light emitting device is 300nm-350nm, and the resonance cavity length of the third primary color light emitting device is 200nm-250nm; Fig. 11C The corresponding results are shown when the resonance cavity length of the first primary color light emitting device is 250nm-300nm, the resonance cavity length of the second primary color light emitting device is 150nm-200nm, and the resonance cavity length of the third primary color light emitting device is 200nm-250nm. Fig. 11C When the resonance cavity length of the first primary color light emitting device of the display panel 110 is 250nm-300nm, the resonance cavity length of the second primary color light emitting device is 150nm-200nm, and the resonance cavity length of the third primary color light emitting device is 200nm-250nm, at the side viewing angle (51.3°, 343°), the range of the brightness ratio of the red picture, the green picture, and the blue picture is 5%, compared with Fig.11A and Fig. 11B As shown in the results, the value of the extreme difference is smaller, so that the color shift phenomenon of the display panel 110 at the side viewing angle (51.3°, 343°) is improved.

[0132] In some embodiments, the display control device 120 is configured to provide a data signal to the display panel 110, and the data signal can control the brightness of the light emitted by the multiple primary color light emitting devices in the display panel 110. Exemplarily, the data signal can be a voltage signal, and the brightness of the light emitted by the light emitting device can increase as the voltage signal increases, or the brightness of the light emitted by the light emitting device can decrease as the voltage signal increases.

[0133] In some embodiments, after receiving the data signal from the display control device 120, the display panel 110 may display a white picture in at least a partial area of ​​the display panel 110. Exemplarily, the display panel 110 displays a white picture in its entire area.

[0134] In some embodiments, the color coordinates of the white image displayed by the display panel 110 at a side viewing angle meet the white balance condition.

[0135] Among them, the white balance condition of the display panel can be formulated based on the actual use scenario of the display panel and the corresponding requirements. Exemplarily, the white balance condition can be that at a certain viewing angle (e.g., a normal viewing angle), the color coordinates of the white screen displayed by the display panel are within the range of (0.31±0.01, 0.32±0.01). Exemplarily, when the color coordinates of the screen displayed by the display panel at a certain viewing angle (e.g., a normal viewing angle) are (0.31, 0.32), the white balance condition is met, and the screen is a white screen.

[0136] Exemplarily, the display control device 120 can be used to enable the display panel 110 to display a white picture, and the white picture satisfies a corresponding white balance condition at a certain side viewing angle. Fig. 12A It shows the degree of color deviation of a white picture displayed by the display panel 110 when the white picture meets the white balance condition at a normal viewing angle; Fig. 12B The figure shows the degree of color deviation of a white picture displayed by the display panel 110 when the white picture satisfies the white balance condition at a side viewing angle (12.7°, 321.4°). Fig. 12C The figure shows the degree of color deviation of a white picture displayed by the display panel 110 when the white picture satisfies the white balance condition at another side viewing angle (42.5°, 336.6°).

[0137] See also Fig. 12A , Fig. 12B as well as Fig. 12C , and referring to the color shift specification requirements described above, the white picture displayed by the display panel 110 can meet the white balance condition at a certain viewing angle within the A+ viewing angle area, for example, see Fig. 12B , the maximum viewing angle of the white picture in the A+ viewing angle area, for example, the viewing angle (12.7°, 321.4°) satisfies the white balance condition, and the white balance condition is, for example, that the color coordinates are in the range of (0.31±0.01, 0.32±0.01). At this time, at the viewing angle (12.7°, 321.4°), the white picture displayed by the display panel 110 satisfies the white balance condition and there is no color cast. Further, the viewing angle (12.7°, 321.4°) is used as the reference viewing angle. Since the greater the change in the viewing angle, the greater the degree of color cast, and compared with the degree of change from the positive viewing angle to the maximum viewing angle in the B viewing angle area, the degree of change from the reference viewing angle (12.7°, 321.4°) to the maximum viewing angle in the B viewing angle area is smaller, and therefore, the corresponding degree of color cast is also smaller (for example, the color cast value is Fig. 12B That is, when the viewing angle (12.7°, 321.4°) is taken as the reference viewing angle, the color deviation of the display image becomes smaller at each viewing angle within the viewing angle region B.

[0138] Continue to see Fig. 12C, the white picture displayed by the display panel 110 can also meet the white balance condition at a certain viewing angle within the A viewing angle area. For example, the white picture meets the white balance condition at the maximum viewing angle within the A viewing angle area, such as the viewing angle (42.5°, 336.6°). The white balance condition is, for example, that the color coordinates are in the range of (0.31±0.01, 0.32±0.01). At this time, at the viewing angle (42.5°, 336.6°), the white picture displayed by the display panel 110 meets the white balance condition and there is no color shift phenomenon. Further, the viewing angle (42.5°, 336.6°) is used as the reference viewing angle. Since the greater the change in the viewing angle, the greater the degree of color shift, and compared with the degree of change from the positive viewing angle to the maximum viewing angle in the B viewing angle area, the degree of change from the reference viewing angle (42.5°, 336.6°) to the maximum viewing angle in the B viewing angle area is smaller, and therefore, the corresponding degree of color shift is also smaller (for example, the color shift value is Fig. 12C That is, when the viewing angle (42.5°, 336.6°) is taken as the reference viewing angle, the degree of color deviation of the display image becomes smaller at each viewing angle within the viewing angle region B.

[0139] The reference viewing angle may be selected based on different usage scenarios of the display panel 110 and corresponding different requirements, so that the color deviation of the picture displayed by the display panel 110 is reduced within a certain viewing angle range.

[0140] Some embodiments of the present invention further provide a method for testing a display panel, through which a more suitable reference viewing angle for a certain display panel can be selected.

[0141] See also Fig.13 The display panel testing method provided by the embodiment of the present invention comprises the following steps:

[0142] S100 (optional): testing a viewing angle of the display panel from a side viewing position, and using the viewing angle obtained by the test as a first side viewing angle or a second side viewing angle.

[0143] In some embodiments, the side view viewing position is, for example, the driving position of the vehicle, and the display panel is, for example, located in the center of the vehicle dashboard or on a side of the vehicle dashboard close to the driving position. The viewing angle of the display panel viewed from the driving position of the vehicle is measured, and the viewing angle obtained by the test is used as the first side view viewing angle or the second side view viewing angle.

[0144] It should be noted that the present invention does not impose any requirements on the order between S100 and other steps. Exemplarily, S100 may be executed first, or may be executed before, during or after executing any of the following steps.

[0145] S101 (optional): input a third data signal to the second display panel, so that the second display panel displays a third white picture in at least a partial area. The color coordinates of the third white picture at a normal viewing angle meet a white balance condition.

[0146] In some embodiments, the second display panel may be an OLED display panel, and its properties may refer to the above description of the display panel, which will not be described in detail here. Exemplarily, the second display panel may include light-emitting devices of multiple primary colors. For example, the second display panel may include a first primary color light-emitting device, a second primary color light-emitting device, and a third primary color light-emitting device, wherein the first primary color is, for example, red, the second primary color is, for example, green, and the third primary color is, for example, blue.

[0147] In some embodiments, the white balance condition may be the white balance condition of the display panel described above. Exemplarily, the white balance condition may be that at a normal viewing angle, the color coordinates of the third white picture displayed by the second display panel are within the range of (0.31±0.01, 0.32±0.01). Another exemplary white balance condition may be that the color coordinates of the third white picture are (0.31, 0.32).

[0148] S102 (optional): testing the color coordinates of the third white picture at the first side viewing angle, and obtaining a fourth color deviation value.

[0149] In some embodiments, the first side view angle can be determined according to the actual usage scenario of the display panel and the corresponding requirements. Exemplarily, the angle of view obtained by the S100 test can be selected as the first side view angle. Also exemplarily, the first side view angle can be a value in the first viewing angle range, and the first viewing angle range can be the horizontal angle H: ±50°, the vertical angle V: +20° / -10°, that is, the viewing angle range corresponding to the B viewing angle area in the European vehicle regulations mentioned above. For example, the first side view angle is (51.3°, 343°).

[0150] In some embodiments, the fourth color deviation value may represent the degree of difference between the color coordinates of the third white picture at the first side viewing angle and the color coordinates of the third white picture at the front viewing angle, that is, the fourth color deviation value may represent the degree of color deviation of the third white picture when the viewing angle changes to the first side viewing angle with the front viewing angle as the reference viewing angle. Exemplarily, the fourth color deviation value may be represented by JNCD, and its calculation process may refer to the above description of the JNCD calculation process, which will not be repeated here.

[0151] S103 (optional): when the fourth color deviation value does not satisfy the color deviation condition, adjust the resonance cavity length of the light emitting device of at least one primary color in the second display panel, and determine the range of the brightness ratio of multiple primary colors of the adjusted second display panel.

[0152] In some embodiments, the color deviation condition of the fourth color deviation value may be JNCD≤5 (it can also be said that the degree of color deviation is ≤5JNCD).

[0153] In some embodiments, determining the range of the brightness ratios of the plurality of primary colors of the second display panel after adjustment may include: causing the second display panel to display a first primary color picture, measuring the brightness of the first primary color picture at a front viewing angle and the brightness of the picture at a first side viewing angle, and calculating the ratio between the two brightnesses, which may be recorded as the brightness ratio of the first primary color; causing the second display panel to display a second primary color picture, measuring the brightness of the second primary color picture at a front viewing angle and the brightness of the picture at a first side viewing angle, and calculating the ratio between the two brightnesses, which may be recorded as the brightness ratio of the second primary color; causing the second display panel to display a third primary color picture, measuring the brightness of the third primary color picture at a front viewing angle and the brightness of the picture at a first side viewing angle, and calculating the ratio between the two brightnesses, which may be recorded as the brightness ratio of the third primary color. Then, calculating the range of the brightness ratio of the first primary color, the brightness ratio of the second primary color, and the brightness ratio of the third primary color, for example, calculating the difference between the maximum value and the minimum value of the three ratios, and the difference is recorded as the range of the three ratios.

[0154] S104 (optional): if the range of the brightness ratios of the plurality of primary colors of the second display panel is less than or equal to the threshold, the second display panel is the first display panel; otherwise, return to the step of adjusting the resonant cavity length of the light-emitting device of at least one primary color in the second display panel.

[0155] In some embodiments, the threshold of the extreme difference of the brightness ratio of multiple primary colors can be selected according to the actual use scenario of the display device and corresponding requirements. Exemplarily, the threshold can be 11%; and in another exemplary embodiment, the threshold can be 5%.

[0156] S105 , outputting a first data signal to the first display panel, so that the first display panel displays a first white picture in at least a partial area thereof, wherein the color coordinates of the first white picture at a normal viewing angle meet a white balance condition.

[0157] In some embodiments, the first display panel may be an OLED display panel, and its properties may refer to the above description of the display panel, which will not be described in detail here. Exemplarily, the first display panel may include light-emitting devices of multiple primary colors. For example, the second display panel may include a first primary color light-emitting device, a second primary color light-emitting device, and a third primary color light-emitting device, wherein the first primary color is, for example, red, the second primary color is, for example, green, and the third primary color is, for example, blue.

[0158] Based on the above description, the first display panel may be a display panel in which the resonant cavity length of the light-emitting device of each primary color meets certain conditions. For example, the first display panel may be a display panel in which the resonant cavity length of the light-emitting device of each primary color meets certain conditions, so that the range of the brightness ratio of multiple primary colors of the first display panel is less than or equal to the threshold. For example, in the first display panel, the resonant cavity length of the first primary color light-emitting device is 250nm to 300nm, the resonant cavity length of the second primary color light-emitting device is 150nm to 200nm, and the resonant cavity length of the third primary color light-emitting device is 200nm to 250nm. For example, the resonant cavity length of the first primary color light emitting device of the first display panel may be 250nm, 260nm, 270nm, 280nm, 290nm or 300nm; the resonant cavity length of the second primary color light emitting device may be 150nm, 160nm, 170nm, 180nm, 190nm or 200nm; the resonant cavity length of the third primary color light emitting device may be 200nm, 210nm, 220nm, 230nm, 240nm or 250nm.

[0159] In some embodiments, the white balance condition may be the white balance condition of the display panel described above. Exemplarily, the white balance condition may be that at a normal viewing angle, the color coordinates of the first white picture displayed by the first display panel are within the range of (0.31±0.01, 0.32±0.01). Another exemplary white balance condition may be that the color coordinates of the first white picture are (0.31, 0.32).

[0160] S106 , testing the color coordinates of the first white picture at a first side viewing angle, and obtaining a first color deviation value.

[0161] In some embodiments, the first color deviation value may represent the difference between the color coordinates of the first white picture at the first side viewing angle and the color coordinates of the first white picture at the front viewing angle, that is, the first color deviation value may represent the color deviation degree of the first white picture when the viewing angle changes to the first side viewing angle with the front viewing angle as the reference viewing angle. Exemplarily, the first color deviation value may be represented by JNCD, and its calculation process may refer to the above description of the JNCD calculation process, which will not be repeated here.

[0162] S107. When the first color deviation value does not satisfy the color deviation condition, perform the following steps at least once, namely, steps S107a and S107b.

[0163] In some embodiments, the color deviation condition of the first color deviation value may be JNCD≤5 (it can also be said that the degree of color deviation is ≤5JNCD).

[0164] S107a: Output a second data signal to the first display panel, so that the first display panel displays a second white picture in at least a partial area thereof.

[0165] The color coordinates of the second white picture at the second side viewing angle meet the white balance condition.

[0166] In some embodiments, the second side view angle can be selected according to the actual application scenario of the display panel and the corresponding requirements. Exemplarily, the viewing angle obtained by the S100 test can be used as the second side view angle. Exemplarily, the second side view angle is between the front view angle and the first side view angle. For example, the second side view angle is a value in the second viewing angle range, and the second viewing angle range is within the first viewing angle range. The second viewing angle range is, for example, a horizontal angle H: ±10°, a vertical angle V: +8° / -4°, that is, the viewing angle range corresponding to the A+ viewing angle area in the European vehicle regulations described above; or, the second viewing angle range is, for example, a horizontal angle H: ±40°, a vertical angle V: +20° / -10°, that is, the viewing angle range corresponding to the A viewing angle area in the European vehicle regulations described above. Exemplarily, the second side view angle is (12.7°, 321.4°); Exemplarily, the second side view angle is (42.5°, 336.6°).

[0167] S107b, testing the color coordinates of the second white picture at the first side viewing angle and the color coordinates of the second white picture at the front viewing angle, and obtaining a second color deviation value and a third color deviation value.

[0168] Among them, the second color deviation value can characterize the degree of difference between the color coordinates of the second white picture at the first side viewing angle and the color coordinates of the second white picture at the second side viewing angle, that is, the second color deviation value can characterize the degree of color deviation of the second white picture when the viewing angle changes to the first side viewing angle with the second side viewing angle as the reference viewing angle. The third color deviation value can characterize the degree of difference between the color coordinates of the second white picture at the front viewing angle and the color coordinates of the second white picture at the second side viewing angle, that is, the third color deviation value can characterize the degree of color deviation of the second white picture when the viewing angle changes to the front viewing angle with the second side viewing angle as the reference viewing angle. Exemplarily, the second color deviation value and the third color deviation value can be characterized by JNCD, and the calculation process thereof can refer to the above description of the JNCD calculation process, which will not be repeated here.

[0169] S108: until the second color deviation value and the third color deviation value both meet the color deviation condition, the corresponding second side viewing angle is used as the target side viewing angle.

[0170] In some embodiments, the color deviation condition of the second color deviation value may be JNCD≤5 (it can also be said that the degree of color deviation is ≤5JNCD).

[0171] In some embodiments, the color deviation condition of the third color deviation value may be JNCD≤5 (it can also be said that the degree of color deviation is ≤5JNCD).

[0172] S109 (optional): if multiple target side view angles are determined, select one from the multiple target side view angles.

[0173] In some embodiments, the target side view angle can be selected according to the actual application scenario of the display panel and the corresponding requirements. For example, the angle obtained by the S100 test can be selected. For example, when the display panel is used for an in-vehicle display device, such as a central control screen in a vehicle, the angle of view of the central control screen from the driver's seat can be used as the target side view angle. In this way, at the user's commonly used viewing angle, the picture displayed by the display panel has no color deviation or a small degree of color deviation, which can provide a good experience for the user.

[0174] An embodiment of the present invention further provides a display panel testing device. Fig.14 3 is a structural diagram of a display panel test device provided in an embodiment of the present invention. The display panel test device 300 may include at least one processor 310 and at least one memory 320. A computer program is stored in at least one memory 310, and at least one processor 310 is configured to run the computer program in at least one memory 320, so that the display panel test device 300 performs a display panel test method.

[0175] The memory 320 may include a high-speed random access memory, and may also include a non-volatile memory, such as a disk storage device, a flash memory device, etc. It may also be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or a one-time programmable memory (OTP), an electrically erasable programmable read-only memory (EEPROM), a disk storage medium, FLASH (flash memory) or other magnetic storage devices, or any other medium that can be used to carry or store program codes in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 320 may exist independently and be connected to the processor 310 via a communication line. The memory 320 may also be integrated with the processor 310.

[0176] The processor 310 is used to implement the test of the display device, which may be one or more general-purpose central processing units (CPU), microprocessors (MCU), logic devices (Logic), application-specific integrated circuits (ASIC), graphics processing units (GPU), or integrated circuits for controlling the execution of programs in some embodiments of the present disclosure; wherein the CPU may be a single-core processor (single-CPU) or a multi-core processor (multi-CPU). A processor here may refer to one or more devices, circuits, or processing cores for processing data (such as computer program instructions, etc.).

[0177] Some embodiments of the present invention further provide a display panel testing device. Fig.15 4 is a structural diagram of a display panel test device 400 provided in an embodiment of the present invention. The display panel test device 400 may include: a first output module 410 , a first test module 420 , a second output module 430 , a second test module 440 , and a first control module 450 . Fig.16 FIG. 5 is a structural diagram of another display panel testing device 500 provided in an embodiment of the present invention. Fig.16 The display panel testing device 500 may further include a third output module 460 , a third testing module 470 , an adjustment module 480 , and a second control module 490 .

[0178] The first output module 410 is configured to output a first data signal to the first display panel, so that the first display panel displays a first white picture in at least a portion of its area. The color coordinates of the first white picture at a normal viewing angle meet the white balance condition. Exemplarily, the first output module 410 may perform step S105 of the method for testing a display device provided in any of the above embodiments.

[0179] The first test module 420 is configured to test the color coordinates of the first white picture at the first side viewing angle and obtain a first color deviation value. The first color deviation value represents the degree of difference between the color coordinates of the first white picture at the first side viewing angle and the color coordinates of the first white picture at the front viewing angle. Exemplarily, the first test module 420 may execute step S106 of the test method for the display device provided in any of the above embodiments.

[0180] The second output module 430 is configured to output a second data signal to the first display panel, so that the first display panel displays a second white picture in at least a part of its area. The color coordinates of the second white picture at the second side viewing angle meet the white balance condition; the second side viewing angle is between the front viewing angle and the first side viewing angle. Exemplarily, the second output module 430 can perform step S107a of the test method of the display device provided in any of the above embodiments.

[0181] The second test module 440 is configured to test the color coordinates of the second white picture at the first side viewing angle and the color coordinates of the second white picture at the front viewing angle, and obtain a second color deviation value and a third color deviation value; wherein the second color deviation value represents the difference between the color coordinates of the second white picture at the first side viewing angle and the color coordinates of the second white picture at the second side viewing angle, and the third color deviation value represents the difference between the color coordinates of the second white picture at the front viewing angle and the color coordinates of the second white picture at the second side viewing angle. Exemplarily, the second test module 440 may execute step S107b of the test method for the display device provided in any of the above embodiments.

[0182] The first control module 450 is configured to control the second output module 430 and the second test module 440 to perform corresponding steps when the first color deviation value does not meet the color deviation condition, until the second color deviation value and the third color deviation value both meet the color deviation condition, and use the corresponding second side viewing angle as the target side viewing angle. Exemplarily, the first control module 450 can perform steps S107 and S108 of the display device testing method provided in any of the above embodiments.

[0183] The third output module 460 is configured to output a third data signal to the second display panel, so that the second display panel displays a third white picture in at least a part of its area, and the color coordinates of the third white picture under a normal viewing angle meet the white balance condition; wherein the second display panel includes light-emitting devices of multiple primary colors. Exemplarily, the third output module 460 can perform step S101 of the test method of the display device provided in any of the above embodiments.

[0184] The third test module 470 is configured to test the color coordinates of the third white picture at the first side viewing angle, and obtain a fourth color deviation value, wherein the fourth color deviation value represents the degree of difference between the color coordinates of the third white picture at the first side viewing angle and the color coordinates of the third white picture at the front viewing angle. Exemplarily, the third test module 470 may execute step S102 of the test method for the display device provided in any of the above embodiments.

[0185] The adjustment module 480 is configured to adjust the resonant cavity length of the light emitting device of at least one primary color in the second display panel, and determine the range of the brightness ratio of multiple primary colors of the second display panel after adjustment. Exemplarily, the adjustment module 480 can execute step S103 of the display device testing method provided in any of the above embodiments.

[0186] The second control module 490 is configured to control the adjustment module 480 to perform corresponding steps when the fourth color deviation value does not meet the color deviation condition, and if the range of the brightness ratios of the plurality of primary colors of the second display panel is less than or equal to the threshold, the second display panel is the first display panel; otherwise, the control adjustment module 480 returns to the step of adjusting the resonant cavity length of the light-emitting device of at least one primary color in the second display panel. Exemplarily, the second control module 490 may perform step S104 of the display device testing method provided in any of the above embodiments.

[0187] Fig.15 and Fig.16 The described embodiment of the test device for the display device is merely illustrative. For example, the above-mentioned division of modules is only a division of logical functions, and there may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. The functional modules in various embodiments of the present invention can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0188] Each of the above modules can be implemented in the form of hardware or software functional units. For example, when software is used, the above modules can be composed of Fig.14 After at least one processor 310 in the test device reads the program code stored in at least one memory 320, the software function module generated is implemented. The above modules can also be implemented by different hardware in the test device. Obviously, the above function modules can also be implemented in a combination of software and hardware.

[0189] In the embodiment of the present invention, since the functions implemented by the display panel testing device described above are similar to the steps in the display panel testing method described above, the specific implementation of the device can refer to the relevant description of the corresponding steps in the above method embodiment, which will not be repeated here.

[0190] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0191] Some embodiments of the present invention further provide a computer-readable storage medium storing computer program instructions, which, when executed on a computer (eg, a display device), enable the computer to execute the display panel testing method provided in any of the above embodiments.

[0192] The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (e.g., a floppy disk, a magnetic disk, a magnetic tape), an optical medium (e.g., a digital video disc (DVD)), or a semiconductor medium (e.g., a solid state drive (SSD)).

[0193] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for testing a display panel, characterized in that: include: Outputting a first data signal to the first display panel so that the first display panel displays a first white picture in at least a partial area thereof, wherein the color coordinates of the first white picture at a normal viewing angle meet a white balance condition; Testing the color coordinates of the first white picture at a first side viewing angle, and obtaining a first color deviation value, where the first color deviation value represents a degree of difference between the color coordinates of the first white picture at the first side viewing angle and the color coordinates of the first white picture at the front viewing angle; When the first color deviation value does not meet the color deviation condition, performing the following steps at least once: Outputting a second data signal to the first display panel so that the first display panel displays a second white picture in at least a partial area thereof, wherein the color coordinates of the second white picture at a second side viewing angle meet a white balance condition; and the second side viewing angle is between the front viewing angle and the first side viewing angle; Testing the color coordinates of the second white picture at the first side viewing angle and the color coordinates of the second white picture at the front viewing angle, and obtaining a second color deviation value and a third color deviation value; until both the second color deviation value and the third color deviation value satisfy the color deviation condition, taking the corresponding second side viewing angle as the target side viewing angle; Among them, the second color deviation value represents the degree of difference between the color coordinates of the second white picture at the first side viewing angle and the color coordinates of the second white picture at the second side viewing angle, and the third color deviation value represents the degree of difference between the color coordinates of the second white picture at the front viewing angle and the color coordinates of the second white picture at the second side viewing angle.

2. The display panel testing method according to claim 1, characterized in that: The first side-view angle is a value within a first angle range, and the first angle range is a horizontal angle H: ±50°; a vertical angle V: +20 / -10°.

3. The display panel testing method according to claim 1, characterized in that: Also includes: A viewing angle of the display panel viewed from a side viewing position is tested, and the viewing angle obtained by the test is used as the first side viewing angle or the second side viewing angle.

4. The display panel testing method according to claim 1, characterized in that: Also includes: If multiple target side viewing angles are determined, one is selected from the multiple target side viewing angles.

5. The display panel testing method according to claim 1, characterized in that: The extreme difference of the brightness ratios of the multiple primary colors of the first display panel is less than or equal to a threshold value, and the brightness ratio of each primary color is the ratio of the brightness of the primary color picture at the first side viewing angle to the brightness of the primary color picture at the front viewing angle when the first display panel displays the corresponding primary color picture.

6. The display panel testing method according to claim 1, characterized in that: The first display panel includes: a first primary color light emitting device, a second primary color light emitting device, and a third primary color light emitting device; The resonance cavity length of the first primary color light emitting device is 250nm-300nm, the resonance cavity length of the second primary color light emitting device is 150nm-200nm, and the resonance cavity length of the third primary color light emitting device is 200nm-250nm.

7. The display panel testing method according to claim 5 or 6, characterized in that: Also includes: Outputting a third data signal to the second display panel so that the second display panel displays a third white picture in at least a partial area thereof, wherein the color coordinates of the third white picture at the normal viewing angle meet the white balance condition; wherein the second display panel comprises: light emitting devices of multiple primary colors; Testing the color coordinates of the third white picture at the first side viewing angle, and obtaining a fourth color deviation value, wherein the fourth color deviation value represents a degree of difference between the color coordinates of the third white picture at the first side viewing angle and the color coordinates of the third white picture at the front viewing angle; When the fourth color deviation value does not satisfy the color deviation condition, the resonance cavity length of the light-emitting device of at least one primary color in the second display panel is adjusted, and the range of the brightness ratios of the plurality of primary colors of the second display panel after adjustment is determined; if the range of the brightness ratios of the plurality of primary colors of the second display panel is less than or equal to the threshold, the second display panel is the first display panel; otherwise, the step of adjusting the resonance cavity length of the light-emitting device of at least one primary color in the second display panel is returned to.

8. A display panel testing device, comprising: A first output module is configured to output a first data signal to a first display panel, so that the first display panel displays a first white picture in at least a partial area thereof, and the color coordinates of the first white picture at a normal viewing angle meet a white balance condition; A first testing module is configured to test the color coordinates of the first white picture at a first side viewing angle, and obtain a first color deviation value, wherein the first color deviation value represents a difference between the color coordinates of the first white picture at the first side viewing angle and the color coordinates of the first white picture at a front viewing angle; a second output module configured to output a second data signal to the first display panel, so that the first display panel displays a second white picture in at least a partial area thereof, wherein the color coordinates of the second white picture at a second side viewing angle meet a white balance condition; and the second side viewing angle is between the front viewing angle and the first side viewing angle; a second testing module, configured to test the color coordinates of the second white picture at the first side viewing angle and the color coordinates of the second white picture at the front viewing angle, and to obtain a second color deviation value and a third color deviation value; wherein the second color deviation value represents the degree of difference between the color coordinates of the second white picture at the first side viewing angle and the color coordinates of the second white picture at the second side viewing angle, and the third color deviation value represents the degree of difference between the color coordinates of the second white picture at the front viewing angle and the color coordinates of the second white picture at the second side viewing angle; The first control module is configured to control the second output module and the second test module to execute corresponding steps when the first color deviation value does not meet the color deviation condition, until the second color deviation value and the third color deviation value both meet the color deviation condition, and use the corresponding second side viewing angle as the target side viewing angle.

9. The display panel testing device according to claim 8, characterized in that: Also includes: A third output module is configured to output a third data signal to a second display panel, so that the second display panel displays a third white picture in at least a part of its area, and the color coordinates of the third white picture at the normal viewing angle meet the white balance condition; wherein the second display panel includes: light-emitting devices of multiple primary colors; a third testing module, configured to test the color coordinates of the third white picture at the first side viewing angle, and obtain a fourth color deviation value, wherein the fourth color deviation value represents a degree of difference between the color coordinates of the third white picture at the first side viewing angle and the color coordinates of the third white picture at the front viewing angle; an adjustment module, configured to adjust the resonant cavity length of the light emitting device of at least one primary color in the second display panel, and determine the range of the brightness ratios of the plurality of primary colors of the second display panel after adjustment; The second control module is configured to control the adjustment module to execute corresponding steps when the fourth color deviation value does not meet the color deviation condition, and if the extreme difference of the brightness ratios of the multiple primary colors of the second display panel is less than or equal to a threshold, the second display panel is the first display panel; otherwise, the adjustment module is controlled to return to the step of adjusting the resonance cavity length of the light-emitting device of at least one primary color in the second display panel.

10. A display panel testing device, comprising: A memory and a processor, wherein the memory is configured to store computer program instructions, and the processor is configured to execute the computer program instructions, so that the display panel test device executes the display panel test method according to any one of claims 1 to 7.

11. A display device, characterized in that: include: Display panel and display control device; The display control device is configured to provide a data signal to the display panel, so that the display panel displays a white picture in at least a partial area thereof, and the color coordinates of the white picture under a side viewing angle meet a white balance condition.

12. The display device according to claim 11, characterized in that: The display panel includes a first primary color light emitting device, a second primary color light emitting device, and a third primary color light emitting device; The resonance cavity length of the first primary color light emitting device is 250nm-300nm, the resonance cavity length of the second primary color light emitting device is 150nm-200nm, and the resonance cavity length of the third primary color light emitting device is 200nm-250nm. 13 . A computer-readable storage medium storing computer program instructions, wherein when the computer program instructions are executed on a computer, the computer executes the display panel testing method according to claim 1 .

Images