Display module, display device, and brightness adjustment method

Abstract

This application discloses a display module, a display device, and a brightness adjustment method. The display module includes a display panel, an optical sensor, and a brightness adjuster. The display panel is used to display information based on the desired brightness; the optical sensor is used to detect the user's current viewing angle of the display panel; the brightness adjuster is used to obtain the current display brightness of the display panel when a target brightness is observed at the current viewing angle, based on the correspondence between the display panel's brightness and the viewing angle, and to control the display panel to display at the current brightness. This application improves the problem of excessively rapid brightness decay of the display panel at different viewing angles by adding an optical sensor to the display module to detect the user's current viewing angle of the display panel, and then adjusting the display brightness of the display panel according to the different current viewing angles using the brightness adjuster. This ensures that the display brightness observed by the user at different viewing angles is basically consistent, thus improving the problem of excessively rapid brightness decay of the display panel at different viewing angles.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display module, display device, and brightness adjustment method. Background Technology

[0002] Organic light-emitting diode (OLED) panels have advantages such as self-illumination, high contrast, wide viewing angle, fast response speed, and thinness and foldability, and are one of the main research directions in the display field.

[0003] OLED panels exhibit significant differences in characteristics at different viewing angles. As the viewing angle increases, the display effect of OLED panels varies considerably, with brightness decreasing noticeably as the viewing angle increases. This results in a poor user experience for OLED panels in both lighting and display applications. Summary of the Invention

[0004] In view of this, the present invention aims to at least partially solve one of the problems in the related art. Therefore, the object of this application is to provide a display module, a display device, and a brightness adjustment method.

[0005] This application provides a display module. The display module includes a display panel, an optical sensor, and a brightness adjuster. The display panel is used to display based on the display brightness; the optical sensor is used to detect the current viewing angle of the user observing the display panel; the brightness adjuster is used to obtain the current display brightness of the display panel when a target brightness is observed at the current viewing angle, based on the correspondence between the display brightness of the display panel and the viewing angle, and to control the display panel to display at the current display brightness.

[0006] In some embodiments, the optical sensor is disposed on the light-emitting side of the display panel.

[0007] In some embodiments, the brightness adjuster is electrically connected to the optical sensor.

[0008] In some embodiments, the brightness adjuster stores the correspondence between the display brightness of the display panel and the viewing angle. The brightness adjuster is used to: determine the target brightness; and determine the corresponding frontal viewing brightness of the display panel to obtain the current display brightness based on the correspondence between the display brightness of the display panel and the viewing angle, the current viewing angle, and the target brightness.

[0009] In some embodiments, the display panel further includes a cathode and an anode disposed opposite each other, wherein the side of the anode facing the cathode is an ellipsoid.

[0010] In some embodiments, the display panel includes pixel units arranged in an array, each pixel unit including red, green, and blue sub-pixel regions, each sub-pixel region forming an anode.

[0011] In some embodiments, the anode is made of indium tin oxide or a metallic material, and the cathode is made of indium tin oxide or a metallic material.

[0012] In some embodiments, the anode spacers are provided with an isolation layer.

[0013] This application also provides a display device. The display device includes the display panel described in any of the above embodiments.

[0014] This application also provides a brightness adjustment method for a display module. The brightness adjustment method includes: acquiring the current viewing angle of a user observing a display panel in the display module; and obtaining the current display brightness of the display panel when a target brightness is observed at the current viewing angle, based on the correspondence between the display brightness of the display panel and the viewing angle; and controlling the display panel to display at the current display brightness.

[0015] This application adds an optical sensor to the display module to detect the current viewing angle of the user observing the display panel. Then, the brightness adjuster adjusts the display panel brightness according to the different current viewing angles, so that the display panel brightness observed by the user at different viewing angles is basically consistent when using the display module, thus improving the problem of excessive brightness decay of the display panel at different viewing angles.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram showing how the microcavity spectral intensity of a traditional OLED device changes with the user's viewing angle.

[0019] Figure 2 This is a schematic diagram illustrating how the display brightness of a traditional OLED device changes with the user's viewing angle.

[0020] Figure 3 This is a schematic diagram of the structure of a display module according to certain embodiments of this application;

[0021] Figure 4This is a schematic diagram of the structure of a display module according to certain embodiments of this application;

[0022] Figure 5 This is a schematic diagram illustrating the effect of adjusting the display brightness of the display panel according to the user's viewing angle in certain embodiments of this application;

[0023] Figure 6 This is a schematic diagram of the structure of a display panel according to certain embodiments of this application;

[0024] Figure 7 This is a schematic diagram illustrating the effect of improved brightness attenuation prediction after the display panel of certain embodiments of this application adopts a novel anode.

[0025] Figure 8 This is a flowchart illustrating the brightness adjustment method of a display module according to certain embodiments of this application. Detailed Implementation

[0026] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0027] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0030] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0031] OLED devices form a strong microcavity structure between the cathode and anode. Generally, the microcavity effect is strongest at a normal viewing angle, and its intensity gradually decreases as the viewing angle increases. Therefore, the display brightness of OLED devices gradually decreases as the viewing angle increases. Figure 1 As shown, the spectral intensity of the OLED microcavity gradually decreases as the viewing angle increases. Figure 1 The diagram illustrates the spectral intensity of the OLED microcavity at four viewing angles: 0°, 30°, 45°, and 60°. A normal viewing angle (0°) can be understood as the user's eye looking directly at the OLED device. Increasing the viewing angle can be understood as the angle created when the user's line of sight deviates from the line of sight directly looking at the OLED device.

[0032] Because the spectral intensity of OLED microcavities gradually decreases with increasing viewing angle, the display brightness of OLED devices gradually decreases as the viewing angle increases. This can be determined by... Figure 1 Get as Figure 2 The diagram shows the relationship between the viewing angle of an OLED device and its display brightness. Figure 2 The positive and negative signs for "medium viewing angle" represent different angles from which a user observes the same point on an OLED device from two opposite directions. For example, Figure 2 The 20°, 40°, 60° and 80° in the figure represent the different visual angles that a user experiences when viewing the OLED device from the right side of the device's frontal viewing angle and from the plane of the OLED device. Figure 2 -20°, -40°, -60°, and -80° represent the different visual angles a user experiences when viewing the OLED device from the left side of its frontal view and from the plane of the OLED device. Figure 2The 20°, 40°, 60° and 80° in the figure represent the different visual angles that a user experiences when positioned above the OLED device's normal viewing angle and relative to the plane of the OLED device. Figure 2 -20°, -40°, -60°, and -80° represent the different visual angles a user experiences when positioned below the OLED device's normal viewing angle and relative to the plane of the OLED device.

[0033] In view of this, please refer to Figure 3 and Figure 4 This application provides a display module 100. The display module 100 includes a display panel 110, an optical sensor 120, and a brightness adjuster 130. The display panel 110 is used to display information according to the display brightness. The optical sensor 120 is used to detect the current viewing angle of the user observing the display panel 110. The optical sensor 120 is disposed on the light-emitting side 101 of the display panel 110. The brightness adjuster 130 is electrically connected to the optical sensor 120. The brightness adjuster 130 can be disposed inside the display panel 110 or outside the display panel 110, for example, it can be disposed on the backlight side 102 of the display panel 110 (e.g.,...). Figure 4 (As shown), no restrictions are imposed here.

[0034] Understandably, the optical sensor 120 measures the angle between the user's eye and the display panel 110 based on optical principles. The optical sensor 120 has many advantages, such as non-contact and non-destructive measurement, minimal interference, high-speed transmission, and telemetry and remote control capabilities.

[0035] The number of optical sensors 120 is one, and the optical sensor 120 can be set at the center of the display panel 110 (e.g., Figure 3 and Figure 4 (As shown), it can also be set in other locations on the display panel 110, and there are no restrictions here.

[0036] The optical sensor 120 can detect the relative position of the user's eye and the optical sensor 120 by emitting a laser, thereby determining the user's visual angle when viewing the display panel 110. Specifically, for example, as Figure 4As shown, the optical sensor 120 emits a laser within a preset range in front of the display panel 110. If the detected human eye is looking directly at the display panel 110, and the eye position is biased towards direction A of the optical sensor 120, then the visual angle of the human eye relative to the display panel 110 is positive. If the eye position is biased towards direction B of the optical sensor 120, then the visual angle of the human eye relative to the display panel 110 is negative. That is, the angle α between the human eye at point O1 and the optical sensor 120 is α, which is the visual angle of the human eye relative to the display panel 110. The angle between the human eye at point O2 and the optical sensor 120 is -β°, which is the visual angle of the human eye relative to the display panel 110.

[0037] The brightness adjuster 130 is used to obtain the current display brightness of the display panel 110 when the target brightness is observed at the current visual angle, based on the correspondence between the display brightness of the display panel 110 and the visual angle, and to control the display panel 110 to display at the current display brightness.

[0038] Understandably, the brightness adjuster 130 stores in advance the correspondence between the display brightness of the display panel 110 and the viewing angle. The brightness adjuster 130 is used to determine the target brightness. Based on the correspondence between the display brightness of the display panel 110 and the viewing angle, the current viewing angle and the target brightness, the corresponding frontal brightness of the display panel 110 is determined to obtain the current display brightness.

[0039] The relationship between the display brightness of the display panel 110 and the viewing angle is based on the test results of actual OLED display panels, which shows the variation of the display brightness of the display panel 110 with the viewing angle. Figure 5 The 0° observation curve, 30° observation curve, and 45° observation curve are shown below.

[0040] For example, when the user's visual angle is 0°, it means that the user is looking directly at the display panel 110. This application can use the display brightness of the display panel corresponding to the brightness curve corresponding to the user's visual angle of 0° as the target brightness, or the direct viewing brightness, so as to ensure that the current display brightness of the display panel 110 observed by the user when using the display panel 110 at a visual angle of 0° is basically consistent with that when using the display panel 110 at other visual angles.

[0041] When a user observes the display panel 110 from other angles, such as when the user's current visual angle is 30°, the required brightness of the display panel 110 corresponding to the current visual angle of 30° can be calculated based on the correspondence between the display brightness of the display panel 110 and the visual angle.

[0042] More specifically, for example, when a user views the display panel 110 at a 0° visual angle, the direct viewing brightness of the display panel 110 is 200 nits. 200 nits is the target brightness that the user needs to observe from other visual angles. When the user views the display panel 110 at a current visual angle of 30°, according to... Figure 1 or Figure 2 As shown, the actual brightness of the display panel 110 observed by the user at this time has decreased by 27%. To achieve a consistent brightness when the user views the display panel 110 from a 0° viewing angle, this application adjusts the display panel's brightness to 200 / (1-27%) = 241 nits. That is, 241 nits represents the current brightness of the display panel when the user observes it at the target brightness from a current viewing angle of 30°. Ultimately, the observed brightness of the display panel 110 can be essentially consistent when the user views it from both a 0° and 30° viewing angle. Figure 5 As shown, this improves the situation where the brightness decreases as the user's viewing angle of the display panel 110 increases, thereby enhancing the user's visual experience when using the display panel 110.

[0043] This application adds an optical sensor 120 to the display module 100 to detect the current viewing angle of the user observing the display panel. Then, a brightness adjuster 130 adjusts the display brightness of the display panel 110 according to the different viewing angles, ensuring that the display brightness of the display panel 110 observed by the user at different viewing angles is essentially consistent. Figure 5 As shown, this improves the problem of excessive brightness decay of the display panel 110 under different viewing angles of the user.

[0044] The above describes the addition of an optical sensor 120 and a brightness sensor 120 to the display panel 110 to address the issue of excessively rapid brightness decay at different viewing angles. Furthermore, this application also designs a novel anode structure for the internal components of the display panel 110 to improve the brightness observed by the user at different viewing angles, thereby further enhancing the display panel's performance.

[0045] Specifically, please refer to Figure 6 The display panel 110 of this application includes a cathode 111 and an anode 112 disposed opposite to each other, wherein the side of the anode 112 facing the cathode 111 is an ellipsoid. The anode 112 may also be other approximately spherical shapes, which are not limited here. The anode 112 of the display panel 110 is disposed on a substrate 113.

[0046] The display panel 110 includes pixel units 114 arranged in an array. Each pixel unit 114 includes red, green, and blue sub-pixel regions, and each sub-pixel region forms an anode 112.

[0047] An isolation layer PDL is provided between the anodes 112. The PDL is an isolation layer that separates each sub-pixel of the organic light-emitting layer (EML) in the display panel 110, so that each sub-pixel or each anode 112 will not interfere with each other.

[0048] The anode 112 is made of indium tin oxide (ITO) or a metallic material, and the cathode 111 is made of indium tin oxide or a metallic material. The metallic material can be Ag or other metallic materials, and there are no limitations herein. For example, the anode of the OLED RGB pixel of the display panel 110 of this application can be composed of ITO / Ag / ITO.

[0049] The anode (ITO / Ag / ITO) of the OLED RGB pixels in the display panel 110 of this application adopts a near-spherical surface design. Due to the inherent properties of OLED devices, under the strong reflection of the metals at both ends of the cathode 111 and anode 112, some of the emitted light will be continuously reflected and diffracted between the two electrodes, thereby enhancing the light emission intensity of the display panel 110. When the display panel 110 adopts the new anode design, the emission angle of the light reflected from the anode 112 will change, increasing the light emission amount at a wide viewing angle.

[0050] Ultimately, the display panel 110 in the display module 100 of this application, through the adoption of a novel anode design, further improves the display brightness observed by the user at different viewing angles (especially wide viewing angles), thereby improving the user experience of the display module 100. The estimated brightness improvement effect can be as follows: Figure 7 As shown.

[0051] This application also provides a display device. The display device includes the display panel 110 described in the above embodiments. The display device can be a computer, television, mobile phone, game console, or other electronic device with an OLED display screen.

[0052] The display device of this application adds an optical sensor 120 to the display module 100 to detect the current viewing angle of the user observing the display panel 110. Then, the brightness adjuster 130 adjusts the display brightness of the display panel 110 according to the different current viewing angles. This makes the display brightness of the display panel 110 observed by the user at different viewing angles when using the display module 100 basically consistent, improving the problem of the display brightness of the display panel 110 decaying too quickly at different viewing angles and enhancing the visual effect of the user using the display panel 110.

[0053] In addition, please see Figure 8 This application also provides a method for adjusting the brightness of a display module. The brightness adjustment method includes:

[0054] 01: Obtain the user's current viewing angle of the display panel in the display module; and

[0055] 03: Based on the correspondence between the display panel's brightness and the viewing angle, obtain the current display brightness of the display panel when the target brightness is observed at the current viewing angle;

[0056] 05: Controls the display panel to display at the current brightness.

[0057] Understandably, the current viewing angle of the user observing the display panel, and the correspondence between the display panel's brightness and the viewing angle, are as described above and will not be repeated here. The specific structure of the display panel is as described above and will not be repeated here.

[0058] The brightness adjustment method of this application can detect the current viewing angle of the user observing the display panel by adding an optical sensor to the display module, and then adjust the display brightness of the display panel according to the different current viewing angles by a brightness adjuster, so that the display brightness of the display panel observed by the user at different viewing angles is basically consistent, thereby improving the problem of the display panel's display brightness decaying too quickly at different viewing angles.

[0059] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A display module, characterized in that, include: The display panel is used to display information based on the display brightness. An optical sensor is used to detect the user's current viewing angle when observing the display panel; and A brightness adjuster is used to obtain the current display brightness of the display panel when the target brightness is observed at the current visual angle, based on the correspondence between the display brightness of the display panel and the viewing angle, and to control the display panel to display at the current display brightness; The display panel further includes a substrate, a cathode and an anode disposed opposite to each other, the anode being disposed on the substrate, the side of the anode facing the cathode being an ellipsoid, the side of the anode facing away from the cathode being a plane, and the cathode being disposed parallel to the substrate.

2. The display module according to claim 1, characterized in that, The optical sensor is located on the light-emitting side of the display panel.

3. The display module according to claim 1, characterized in that, The brightness adjuster is electrically connected to the optical sensor.

4. The display module according to claim 1, characterized in that, The brightness adjuster stores the correspondence between the display brightness of the display panel and the viewing angle. The brightness adjuster is used for: Determine the target brightness; Based on the correspondence between the display brightness and the viewing angle of the display panel, the current viewing angle, and the target brightness, the corresponding frontal viewing brightness of the display panel is determined to obtain the current display brightness.

5. The display module according to claim 1, characterized in that, The display panel includes pixel units arranged in an array, each pixel unit including red, green, and blue sub-pixel regions, and each sub-pixel region forming an anode.

6. The display module according to claim 5, characterized in that, The anode is made of indium tin oxide or a metallic material, and the cathode is made of indium tin oxide or a metallic material.

7. The display module according to claim 5, characterized in that, An isolation layer is provided between the anodes.

8. A display device, characterized in that, The display device includes the display module according to any one of claims 1 to 7.

9. A method for adjusting the brightness of a display module as described in any one of claims 1-7, characterized in that, include: Obtain the user's current viewing angle when observing the display panel in the display module; and Based on the correspondence between the display brightness of the display panel and the viewing angle, the current display brightness of the display panel is obtained when the target brightness is observed at the current viewing angle; The display panel is controlled to display at the current display brightness. The display panel also includes a substrate, a cathode and an anode disposed opposite each other. The anode is disposed on the substrate. The side of the anode facing the cathode is an ellipsoid, and the side of the anode away from the cathode is a plane. The cathode is disposed parallel to the substrate.

Images