Display panel, display device and display method

Abstract

The application provides a display panel, a display device and a display method. The display panel comprises a substrate and a light-emitting device layer. The light-emitting device layer is arranged on one side of the substrate. The light-emitting device layer comprises a plurality of light-emitting units. The plurality of light-emitting units comprises first light-emitting units and second light-emitting units. The light-emitting effects of the first light-emitting units and the second light-emitting units are the same under a first field of view angle. The change rate of the light-emitting characteristics of the first light-emitting units relative to the field of view angle is different from the change rate of the light-emitting characteristics of the second light-emitting units. At least part of the second light-emitting units are configured to emit light when displaying first image information and to be turned off when displaying second image information. The application can realize encrypted display of the display panel without changing external environmental conditions, and is beneficial to the transmission of encrypted information.

Description

Technical Field

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

[0002] Display devices are widely used as important tools for information transmission. In certain scenarios, some information cannot be fully displayed to everyone, necessitating encryption of the information displayed on the device. How to achieve encryption for display devices has become a pressing issue that needs to be addressed. Summary of the Invention

[0003] This application provides a display panel, display device, and display method that can achieve encrypted information transmission.

[0004] In a first aspect, embodiments of this application provide a display panel, including a substrate and a light-emitting device layer. The light-emitting device layer is disposed on one side of the substrate and includes a plurality of light-emitting units, including a first light-emitting unit and a second light-emitting unit. Under a first field of view, the first light-emitting unit and the second light-emitting unit have the same light-emitting effect.

[0005] The rate of change of the light emission characteristics of the first light-emitting unit with respect to the change of the field of view is different from that of the second light-emitting unit. At least some of the second light-emitting units are configured to emit light when displaying the first image information and to turn off when displaying the second image information.

[0006] In some embodiments, at least a portion of the film layer in the second light-emitting unit has its surface facing away from the substrate tilted relative to the plane of the substrate.

[0007] In some embodiments, the first light-emitting unit includes a first light-emitting layer and a first electrode located on the side of the first light-emitting layer facing the substrate, the first electrode having a first surface facing away from the substrate;

[0008] The second light-emitting unit includes a second light-emitting layer and a second electrode located on the side of the second light-emitting layer facing the substrate, the second electrode having a second surface facing away from the substrate;

[0009] The first surface intersects with the second surface.

[0010] In some embodiments, the first surface is parallel to the plane of the substrate.

[0011] In some embodiments, the second surface has an angle α with the substrate, where α ≤ 60°.

[0012] In some embodiments, the first light-emitting unit includes a first light-emitting layer, the first light-emitting layer includes a first light-emitting material, and the second light-emitting unit includes a second light-emitting layer, the second light-emitting layer includes a second light-emitting material;

[0013] The emission peaks of the first luminescent material and the second luminescent material are different, and / or the half-width at half-maximum (WHM) of the first luminescent material is different from that of the second luminescent material.

[0014] In some embodiments, the angle between the first field of view and the thickness direction of the substrate is less than or equal to 30°.

[0015] In some embodiments, at the second field of view, the light emission effects of the first light-emitting unit and the second light-emitting unit are different, and the angle β between the second field of view and the plane where the substrate is located is less than or equal to 60°.

[0016] In some embodiments, a plurality of second light-emitting units together constitute a first preset pattern; and / or,

[0017] Multiple second light-emitting units are distributed in an array, and at least some of the second light-emitting units are configured to be turned off when displaying the first image information.

[0018] Secondly, embodiments of this application provide a display device, including the display panel in any of the foregoing embodiments.

[0019] Thirdly, embodiments of this application provide a display method, which includes:

[0020] Acquire image information;

[0021] When the image information is the first image information, the first light-emitting unit and the second light-emitting unit are controlled to emit light. The rate of change of the light emission characteristics of the first light-emitting unit relative to the change of the field of view is different from that of the second light-emitting unit, so that the second light-emitting unit stands out from the first light-emitting unit in the second field of view.

[0022] In some embodiments, after acquiring image information, the process includes:

[0023] When the image information is the second image information, the second light-emitting unit is turned off.

[0024] In some embodiments, a plurality of second light-emitting units together form a first preset pattern, and the first preset pattern is the same as the first image information;

[0025] In the step of controlling the first and second light-emitting units to emit light when the image information is the first image information, all the second light-emitting units are controlled to emit light so that all the second light-emitting units display the first image information under the second field of view.

[0026] In some embodiments, a plurality of second light-emitting units are arranged in an array;

[0027] In the step of controlling the first light-emitting unit and the second light-emitting unit to emit light when the image information is the first image information, the second light-emitting unit is controlled to emit light and the second light-emitting unit is controlled not to emit light.

[0028] This application provides a display panel, display device, and display method. By configuring a first light-emitting unit and a second light-emitting unit with different rates of change of light emission characteristics, the display panel can display different image information under a first viewing angle and a second viewing angle, and can also display the first image information under the second viewing angle. Encrypted display of the display panel can be achieved without changing external environmental conditions, which is beneficial for the transmission of encrypted information. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a pixel arrangement structure in a display panel provided in an embodiment of this application;

[0031] Figure 2 yes Figure 1 A magnified structural diagram of region Q in the middle region;

[0032] Figure 3 yes Figure 1 A magnified structural diagram of region P in the middle;

[0033] Figure 4 yes Figure 2 A schematic diagram of the cross-sectional structure of AA;

[0034] Figure 5 yes Figure 3 Schematic diagram of the cross-sectional structure of BB;

[0035] Figure 6 This is a schematic diagram of another pixel arrangement structure in a display panel provided in an embodiment of this application;

[0036] Figure 7 This is a schematic diagram of a pixel arrangement structure in a display panel provided in an embodiment of this application;

[0037] Figure 8 This is a schematic diagram of a pixel arrangement structure in a display panel provided in an embodiment of this application;

[0038] Figure 9 This is a schematic diagram of a pixel arrangement structure in a display panel provided in an embodiment of this application;

[0039] Figure 10 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0040] Figure 11 This is a flowchart of a display method provided in an embodiment of this application;

[0041] Figure 12 This is a flowchart of a display method provided in an embodiment of this application.

[0042] Marker explanation:

[0043] 1. Substrate;

[0044] 2. Light-emitting device layer; 21. First light-emitting unit; 211. First light-emitting layer; 212. First electrode; 2121. First surface; 22. Second light-emitting unit; 221. Second light-emitting layer; 222. Second electrode; 2221. Second surface; 23. Third light-emitting unit; 24. Third electrode;

[0045] 3. Array layer;

[0046] FOV1, first field of view; FOV2, second field of view;

[0047] A1, first pixel unit; A2, second pixel unit;

[0048] P1, First preset pattern;

[0049] Z, thickness direction. Detailed Implementation

[0050] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0052] Display panels are crucial windows for information transmission in the modern era, and how to utilize display panels for encrypted information transmission is an important research area. Current research has developed various methods, such as designing different materials to display different information under varying conditions (high and low temperatures), solvents (polar / non-polar), and lighting (sunlight / UV light).

[0053] However, these solutions all have the drawback of requiring changes in the external environment to transmit information. Therefore, how to read encrypted information without relying on external conditions has become an important technical challenge and direction.

[0054] To solve the above problems, firstly, please refer to [the relevant information]. Figures 1 to 5 This application provides a display panel including a substrate 1 and a light-emitting device layer 2. The light-emitting device layer 2 is disposed on one side of the substrate 1 and includes multiple light-emitting units, including a first light-emitting unit 21 and a second light-emitting unit 22. Under a first field of view FOV1, the first light-emitting unit 21 and the second light-emitting unit 22 have the same light-emitting effect.

[0055] The rate of change of the light emission characteristics of the first light-emitting unit 21 with respect to the change of the field of view is different from the rate of change of the light emission characteristics of the second light-emitting unit 22. At least a portion of the second light-emitting unit 22 is configured to emit light when displaying the first image information and to turn off when displaying the second image information.

[0056] Substrate 1 can be a rigid substrate, such as being made of glass or similar materials. Alternatively, substrate 1 can be a flexible substrate, such as being made of a light-transmitting material like polyimide (PI). A light-emitting device layer 2 is located on one side of substrate 1. This layer includes various types of light-emitting units, each capable of emitting light of different colors. These units work together to emit light, enabling the display panel to display specific images.

[0057] The multiple light-emitting units include a first light-emitting unit 21 and a second light-emitting unit 22. The emission color of the first light-emitting unit 21 is not limited in this embodiment. Under the first field of view (FOV1), the first light-emitting unit 21 and the second light-emitting unit 22 have the same emission effect. The field of view, also known as the viewing angle, represents the field of vision. The angle between the first field of view (FOV1) and the plane containing the substrate 1 typically determines the specific location of the field of vision, while the size of the first field of view (FOV1) typically determines the range of the field of vision.

[0058] The phrase "the first light-emitting unit 21 and the second light-emitting unit 22 have the same light-emitting effect" mentioned in this application embodiment refers to the fact that, under the first field of view (FOV1), the first light-emitting unit 21 and the second light-emitting unit 22 have the same light-emitting characteristics. Specifically, the light-emitting characteristics include, but are not limited to, color or brightness. Under the first field of view (FOV1), when both the first light-emitting unit 21 and the second light-emitting unit 22 emit light, the color of the light emitted by the first light-emitting unit 21 and the second light-emitting unit 22 is the same, that is, the wavelengths of the light emitted by the two are the same; or, under the first field of view (FOV1) and under the same external current, voltage, and other conditions, the first light-emitting unit 21 and the second light-emitting unit 22 can emit light of the same brightness. For example, both the first light-emitting unit 21 and the second light-emitting unit 22 can emit green light under the first field of view (FOV1).

[0059] It should be noted that, under the first field of view FOV1, the first light-emitting unit 21 and the second light-emitting unit 22 may only have one of the colors and brightness that are consistent, or both the colors and brightness may be consistent. This application embodiment does not limit this.

[0060] Under the first field of view FOV1, the first light-emitting unit 21 and the second light-emitting unit 22 have the same light-emitting effect. Therefore, when a user uses the display panel provided in this embodiment under the first field of view FOV1, the user will get the same display screen as a conventional display panel. That is, when a user observes the display panel provided in this embodiment under the first field of view FOV1, the display effect will be the same or similar to that of using other display panels.

[0061] The rate of change of luminous characteristics of the first light-emitting unit 21 with respect to changes in the field of view is different from that of the second light-emitting unit 22. The rate of change of luminous characteristics includes, but is not limited to, the rate of change of luminous color or luminous brightness. Normally, the characteristics of the light emitted by the light-emitting unit change with changes in the field of view.

[0062] For example, when the first light-emitting unit 21 can emit green light at a vertical viewing angle, the first light-emitting unit 21 will provide the user with a brighter green light when the user observes the display panel vertically; when the user observes the display panel at a relatively tilted angle, since most of the light emitted by the first light-emitting unit 21 leaves the display panel vertically, the brightness of the light provided by the first light-emitting unit 21 to the user will decrease when the user observes at a tilted angle. At the same time, the wavelength of the light emitted by the first light-emitting unit 21 will also change at the tilted viewing angle, and the light emitted by the first light-emitting unit 21 received by the user at this time will be yellow-green.

[0063] Because the rate of change of the luminous characteristics of the first luminous unit 21 relative to the change of the field of view is different from that of the second luminous unit 22, and the luminous effects of the first luminous unit 21 and the second luminous unit 22 are the same under the first field of view FOV1, the luminous effects of the first luminous unit 21 and the second luminous unit 22 are different under the second field of view FOV2, which is different from the first field of view FOV1. That is, when the first luminous unit 21 and the second luminous unit 22 emit light simultaneously, the second luminous unit 22 can be highlighted relative to the first luminous unit 21 under the second field of view FOV2.

[0064] Furthermore, the display panel provided in this application embodiment can achieve encrypted display. Specifically, the first image information is encrypted image information. When the display panel displays the first image information, the display panel controls both the first light-emitting unit 21 and the second light-emitting unit 22 to emit light. Then, the user will observe different image information under the first field of view FOV1 and the second field of view FOV2. Under the second field of view FOV2, the user can clearly observe the position of the second light-emitting unit 22. At this time, the pattern formed by all the emitting second light-emitting units 22 is the first image information presented by the display panel.

[0065] It should be noted that when the display panel needs to display the first image information, the display panel can control all the second light-emitting units 22 to emit light, or it can control some of the second light-emitting units 22 to emit light, depending on the actual image information that needs to be encrypted.

[0066] Furthermore, due to the small size of the light-emitting units, the human eye can typically only observe the structure of a pixel unit composed of multiple light-emitting units, or structures larger than a pixel unit. Therefore, the first light-emitting unit 21 and the second light-emitting unit 22 are usually located in different pixel units, for example, as shown in... Figure 2 and Figure 3 As shown, the first light-emitting unit 21 is located within the first pixel unit A1, and the second light-emitting unit 22 is located within the second pixel unit A2. Figure 1 In the diagram, the first pixel unit A1 is illustrated with a solid-line box, and the second pixel unit A2 is illustrated with a dashed-line box. Neither the solid nor the dashed boxes constitute a limitation on the shape of the first pixel unit A1 or the second pixel unit A2. The specific structure of the first pixel unit A1 and the second pixel unit A2 is not limited in this embodiment.

[0067] Optionally, the first pixel unit A1 and the second pixel unit A2 are identical in number and type, except for the first light-emitting unit 21 and the second light-emitting unit 22. This ensures that the first pixel unit A1 and the second pixel unit A2 have the same light-emitting effect under the first field of view FOV1. Furthermore, by simply controlling the light emission of the first light-emitting unit 21 and the second light-emitting unit 22, the first pixel unit A1 and the second pixel unit A2 can achieve different light-emitting effects under the second field of view FOV2.

[0068] The light emitted by a pixel unit is usually a mixture of the light emitted by all the light-emitting units within that pixel unit. Therefore, under the first field of view (FOV1), the first light-emitting unit 21 and the second light-emitting unit 22 having the same light-emitting effect will result in the first pixel unit A1 and the second pixel unit A2 having the same light-emitting effect; under the second field of view (FOV2), the first light-emitting unit 21 and the second light-emitting unit 22 having different light-emitting effects will result in the first pixel unit A1 and the second pixel unit A2 having different light-emitting effects.

[0069] Furthermore, under the second field of view FOV2, the position of the first image information observed by the user is the position of the second pixel unit A2, including the second light-emitting unit 22. Therefore, by adjusting the specific distribution of the first pixel unit A1 and the second pixel unit A2, the display panel can display different first image information.

[0070] It should be noted that the first image information in the embodiments of this application can be solid color image information or non-solid color image information, as long as it satisfies the requirement that when the display panel displays the first image information, the user can observe different image information under the second field of view FOV2 than under the first field of view FOV1. The embodiments of this application do not impose too many restrictions on this.

[0071] When the display panel needs to display unencrypted information, i.e., when the display panel displays the second image information, it is necessary to control the display panel to display the same image information under the first field of view (FOV1) and the second field of view (FOV2). Therefore, it is necessary to control the second light-emitting unit 22 to turn off. Furthermore, the first light-emitting unit 21 can also be controlled to turn off. In this case, the display panel relies on other light-emitting units to achieve the display effect.

[0072] For example, the first pixel unit A1 includes a first light-emitting unit 21 and a third light-emitting unit 23, and the second pixel unit A2 includes a second light-emitting unit 22 and a third light-emitting unit 23. The third light-emitting unit 23 is identical to the first light-emitting unit 21, meaning that under any viewing angle, the first light-emitting unit 21 and the third light-emitting unit 23 have the same light-emitting effect. When displaying the first image information, the third light-emitting unit 23 in the first pixel unit A1 and the second pixel unit A2 does not emit light, and the first pixel unit A1 and the second pixel unit A2 emit light relying on the first light-emitting unit 21 and the second light-emitting unit 22, respectively. When displaying the second image information, neither the first light-emitting unit 21 nor the second light-emitting unit 22 in the first pixel unit A1 and the second pixel unit A2 emits light, while both the first pixel unit A1 and the second pixel unit A2 emit light relying on the third light-emitting unit 23.

[0073] It should be noted that the embodiments of this application do not limit the number and type of light-emitting units in the first pixel unit A1 and the second pixel unit A2.

[0074] This embodiment of the application sets the first light-emitting unit 21 and the second light-emitting unit 22 to have different rates of change of light emission characteristics, so that the display panel can display different image information under the first field of view FOV1 and the second field of view FOV2, and can display the first image information under the second field of view FOV2. Encrypted display of the display panel can be achieved without changing the external environmental conditions, which is beneficial for the transmission of encrypted information.

[0075] In some embodiments, at least a portion of the film layer in the second light-emitting unit 22 is inclined relative to the plane of the substrate 1 on the surface away from the substrate 1.

[0076] The film structure in the second light-emitting unit 22 can affect the light emission angle of the second light-emitting unit 22 and the light emission effect of the second light-emitting unit 22 under different field of view angles. Based on this, the embodiments of this application tilt at least part of the film layer in the second light-emitting unit 22 relative to the substrate 1, thereby causing the brightness decay rate of the first light-emitting unit 21 to be different from that of the second light-emitting unit 22. Therefore, under the second field of view angle FOV2, the light emission brightness of the first light-emitting unit 21 is different from that of the second light-emitting unit 22.

[0077] The specific film structure of the second light-emitting unit 22 is not limited in this application embodiment. For example, the second light-emitting unit 22 includes a second light-emitting layer 221 and a second electrode 222 located on the side of the second light-emitting layer 221 facing the substrate 1. Either the surface of the second light-emitting layer 221 facing away from the substrate 1 is inclined relative to the plane of the substrate 1, or the surface of the second electrode 222 facing away from the substrate 1 is inclined relative to the plane of the substrate 1.

[0078] In some embodiments, such as Figure 4 and Figure 5 As shown, the first light-emitting unit 21 includes a first light-emitting layer 211 and a first electrode 212 located on the side of the first light-emitting layer 211 facing the substrate 1. The first electrode 212 has a first surface 2121 facing away from the substrate 1. The second light-emitting unit 22 includes a second light-emitting layer 221 and a second electrode 222 located on the side of the second light-emitting layer 221 facing the substrate 1. The second electrode 222 has a second surface 2221 facing away from the substrate 1. The first surface 2121 and the second surface 2221 intersect.

[0079] The first light-emitting layer 211 and the second light-emitting layer 221 are the portions of the first light-emitting unit 21 and the second light-emitting unit 22 respectively used to achieve the light-emitting effect. The first electrode 212 is disposed corresponding to the first light-emitting layer 211 and is used to control the first light-emitting layer 211 to emit light. The second electrode 222 is disposed corresponding to the second light-emitting layer 221 and is used to control the second light-emitting layer 221 to emit light. Exemplarily, the display panel also includes an array layer 3, which is located between the light-emitting device layer 2 and the substrate 1. The array layer 3 is provided with a driving circuit and a plurality of thin film transistors (TFTs) electrically connected to the driving circuit. Some TFTs are electrically connected to the first electrode 212 and are used to drive the first light-emitting unit 21 to emit light or turn off. Some TFTs are electrically connected to the second electrode 222 and are used to drive the second light-emitting unit 22 to emit light or turn off.

[0080] In addition, the display panel may also include a third electrode 24, which is located on the side of the first light-emitting layer 211 facing away from the substrate 1 and on the side of the second light-emitting layer 221 facing away from the substrate 1. The third electrode 24 is a common electrode, and the first light-emitting unit 21 and the second light-emitting unit 22 can share the same third electrode 24.

[0081] The first electrode 212 has a first surface 2121 on the side away from the substrate 1, and the second electrode 222 has a second surface 2221 on the side away from the substrate 1. The first surface 2121 and the second surface 2221 intersect, which means that the flatness of the first electrode 212 is different from that of the second electrode 222.

[0082] For different light-emitting units, different electrode flatness often means that the luminance of the corresponding light-emitting layer attenuates at different rates with changing field of view. Specifically, for the first light-emitting unit 21 and the second light-emitting unit 22, their luminous effects are the same under the first field of view FOV1; however, as the viewing angle changes, due to the difference in flatness between the first electrode 212 and the second electrode 222, the luminance attenuation rate of the first light-emitting unit 21 is different from that of the second light-emitting unit 22. Therefore, under the second field of view FOV2, the luminance of the first light-emitting unit 21 is different from that of the second light-emitting unit 22. As a result, the second light-emitting unit 22 can stand out from the first light-emitting unit 21 and thus display the first image information under the second field of view FOV2.

[0083] The relationship between the first surface 2121 and the second surface 2221 is not limited in this embodiment; that is, the flatness of the first electrode 212 can be greater than or less than that of the second electrode 222. Furthermore, under the second field of view (FOV2), the luminous intensity of the first light-emitting unit 21 can be greater than or less than that of the second light-emitting unit 22. As long as the luminous intensity of the first light-emitting unit 21 is different from that of the second light-emitting unit 22 under the second field of view (FOV2), so that the second light-emitting unit 22 can highlight the first light-emitting unit 21 for display, it is acceptable.

[0084] In some embodiments, such as Figure 5 As shown, the first surface 2121 is parallel to the plane of the substrate 1, meaning that the first electrode 212 has a high flatness.

[0085] In this configuration, the shape of the first electrode 212 is the same as that of the electrodes in the other light-emitting units except for the second light-emitting unit 22. Therefore, the first electrode 212 can be fabricated simultaneously with the corresponding electrodes in the other light-emitting units to improve the fabrication efficiency of the display panel. Simultaneously, the high flatness of the first electrode 212 reduces the rate of brightness decay of the first light-emitting unit 21 as the viewing angle changes, thereby improving the luminous effect of the first light-emitting unit 21.

[0086] In some embodiments, such as Figure 4 As shown, the second surface 2221 and the substrate 1 have an included angle α, where α satisfies: 0°<α≤60°.

[0087] The second surface 2221 is inclined relative to the surface of the substrate 1, so that the flatness of the second electrode 222 is different from that of the first electrode 212. At the same time, the included angle α in this embodiment is set to no more than 60° to avoid affecting the light emission effect of the second light-emitting unit 22 under the first field of view FOV1 due to an excessively large included angle α.

[0088] In some embodiments, the first light-emitting unit 21 includes a first light-emitting layer 211, which includes a first light-emitting material; the second light-emitting unit 22 includes a second light-emitting layer 221, which includes a second light-emitting material. The emission peak of the first light-emitting material is different from that of the second light-emitting material, and / or the half-width at half maximum (WHM) of the first light-emitting material is different from that of the second light-emitting material.

[0089] The specific material of the luminescent material is not limited in the embodiments of this application. For example, both the first luminescent material and the second luminescent material are organic luminescent materials. The material of the luminescent material determines its corresponding emission peak and half-peak width.

[0090] This application embodiment controls the materials of the first and second luminescent materials to make their emission peaks and half-peak widths different. Furthermore, by controlling the microcavity dimensions of the first luminescent unit 21 corresponding to the first luminescent material and the second luminescent unit 22 corresponding to the second luminescent material, the first and second luminescent units 21 and 22 can emit light of the same color under a first field of view (FOV1). Simultaneously, because the emission peaks and / or half-peak widths of the first and second luminescent materials are different, the rates of change of the luminescence characteristics of the first and second luminescent units 21 and 22 with changing field of view are different, thereby enabling the first and second luminescent units 21 and 22 to emit light of different colors or brightness under a second field of view (FOV2), achieving the transmission of encrypted information.

[0091] In some embodiments, such as Figure 4 As shown, the angle β between the first field of view FOV1 and the thickness direction Z of substrate 1 is less than or equal to 30°.

[0092] The thickness direction Z of substrate 1 is typically the same as the thickness direction of the display panel. Under the first field of view (FOV1), the first light-emitting unit 21 and the second light-emitting unit 22 have the same light-emitting effect, and the user will not observe the encrypted information. To ensure that the user will not observe the first image information under normal circumstances, this embodiment limits the first field of view (FOV1) to an angle β less than or equal to 30° with the thickness direction Z of substrate 1. That is, within the range shown by the dashed line in the figure, the user observes the same light-emitting effect of the first light-emitting unit 21 and the second light-emitting unit 22, and therefore cannot observe the first image information.

[0093] In some embodiments, the angle γ between the second field of view FOV2 and the plane containing the substrate 1 is less than or equal to 60°.

[0094] The second field of view (FOV2) is located outside the first field of view (FOV1), and the two do not overlap. Under the second field of view (FOV2), the light emission effects of the first light-emitting unit 21 and the second light-emitting unit 22 are different, and the user can observe the first image information under the second field of view (FOV2). To prevent the user from easily observing the first image information during normal use, this embodiment limits the angle γ between the second field of view (FOV2) and the plane where the substrate 1 is located to within 60°, thereby improving the security of the display panel. Optionally, the angle β between the second field of view (FOV2) and the plane where the substrate 1 is located is less than or equal to 30°.

[0095] In some embodiments, please refer to Figure 4 and Figure 6 Multiple second light-emitting units 22 together constitute the first preset pattern P1.

[0096] Multiple second light-emitting units 22 together constitute a first preset pattern P1, and the shape of the first preset pattern P1 determines the first image information that can be transmitted. For example, the pattern "E" selected in the figure is the first preset pattern P1, and the multiple dashed boxes located in the first preset pattern P1 represent second pixel units A2 containing second light-emitting units 22. In the figure, multiple second light-emitting units 22 together form the pattern "E", so that under the second field of view FOV2, the user can observe the information "E" through the display panel.

[0097] In some embodiments, please refer to Figure 7 Multiple second light-emitting units 22 are arrayed, and at least some of the second light-emitting units 22 are configured to be turned off when displaying the first image information.

[0098] Multiple second light-emitting units 22 are arranged side by side in the row and column directions of the display panel. When the display panel emits light, different encrypted information can be displayed by controlling different second light-emitting units 22 to emit or not emit light.

[0099] For example, such as Figure 7 As shown, Figure 7 The multiple dashed boxes in the image represent second pixel units A2 containing second light-emitting units 22. There are twelve second pixel units A2 in total, arranged in a four-row, three-column configuration. Figure 8 As shown, when the encrypted information is the number "6", it is necessary to control the second light-emitting unit 22 in the second and third second pixel units A2 located in the second row to not emit light; as Figure 9 As shown, when the encrypted information is the number "0", it is necessary to control the second light-emitting unit 22 in the second pixel unit A2 of the second row and the second pixel unit A2 of the third row to not emit light.

[0100] In some alternative embodiments, such as Figure 2 and Figure 3 As shown, the second pixel unit A2 includes a third light-emitting unit 23, and the first light-emitting unit 21 is completely identical to the third light-emitting unit 23. When a portion of the second light-emitting units 22 in the second pixel unit A2 does not emit light, the third light-emitting units 23 in that portion of the second pixel unit A2 are controlled to emit light, so as to ensure that under the first field of view FOV1, the display panel provided in this embodiment can have the same display effect as a conventional display panel.

[0101] This application embodiment distributes multiple second light-emitting units 22 in an array and configures at least some of the second light-emitting units 22 to be turned off when displaying first image information, thereby enabling the display of different first image information and further satisfying the encryption requirements of the display panel.

[0102] Secondly, please refer to Figure 10 This application provides a display device, including the display panel in any of the foregoing embodiments.

[0103] It should be noted that the display device improved in this application embodiment has the beneficial effects of the display panel in any of the foregoing embodiments. For details, please refer to the foregoing description of the display panel. This application embodiment will not repeat the description.

[0104] Thirdly, please refer to Figure 4 , Figure 5 as well as Figure 11 This application provides a display method, which includes:

[0105] S100: Acquire image information.

[0106] In step S100, the image information includes first image information and second image information. For different image information, the display panel needs to control different light-emitting units to perform light-emitting operations. The first image information is encrypted image information, and the second image information is unencrypted image information.

[0107] S110: When the image information is the first image information, control the first light-emitting unit and the second light-emitting unit to emit light. The rate of change of the light emission characteristics of the first light-emitting unit relative to the change of the field of view is different from that of the second light-emitting unit, so that the second light-emitting unit stands out from the first light-emitting unit in the second field of view.

[0108] In step S110, when the display panel needs to display the first image information, both the first light-emitting unit 21 and the second light-emitting unit 22 emit light. Since the first light-emitting unit 21 and the second light-emitting unit 22 have the same light-emitting effect under the first field of view FOV1, the user will not observe the first image information under the first field of view FOV1.

[0109] Since the rate of change of the light emission characteristics of the first light-emitting unit 21 relative to the change of the field of view is different from that of the second light-emitting unit 22, the light emission effects of the first light-emitting unit 21 and the second light-emitting unit 22 are different under the second field of view FOV2, which is different from the first field of view FOV1. That is, the second light-emitting unit 22 can highlight the first light-emitting unit 21 under the second field of view FOV2, and the display panel can realize the transmission of the first image information by means of the second light-emitting unit 22.

[0110] In some embodiments, please refer to Figure 4 , Figure 5 as well as Figure 12 After step S100, the method further includes:

[0111] S120: When the image information is the second image information, control the second light-emitting unit to turn off.

[0112] In step S120, the second image information is the unencrypted image information. When the display panel needs to display the second image information, it is necessary to control the display panel to display the same image information under the first field of view (FOV1) and the second field of view (FOV2). Therefore, it is necessary to control the second light-emitting unit 22 to turn off. Furthermore, the first light-emitting unit 21 can also be controlled to turn off. At this time, the display panel relies on other light-emitting units to achieve the display effect.

[0113] For example, such as Figure 2 and Figure 3 As shown, the first pixel unit A1 includes a first light-emitting unit 21 and a third light-emitting unit 23, and the second pixel unit A2 includes a second light-emitting unit 22 and a third light-emitting unit 23. The third light-emitting unit 23 is identical to the first light-emitting unit 21, meaning that under any viewing angle, the first light-emitting unit 21 and the third light-emitting unit 23 have the same light-emitting effect. When displaying the first image information, the third light-emitting unit 23 in the first pixel unit A1 and the second pixel unit A2 does not emit light, and the first pixel unit A1 and the second pixel unit A2 emit light using the first light-emitting unit 21 and the second light-emitting unit 22, respectively. When displaying the second image information, neither the first light-emitting unit 21 nor the second light-emitting unit 22 in the first pixel unit A1 and the second pixel unit A2 emits light, while both the first pixel unit A1 and the second pixel unit A2 emit light using the third light-emitting unit 23.

[0114] In some embodiments, please refer to Figure 6 Multiple second light-emitting units 22 together form a first preset pattern P1, which is identical to the first image information. In step S110, all second light-emitting units 22 are controlled to emit light, so that all second light-emitting units 22 display the first image information in the second field of view.

[0115] Multiple second light-emitting units 22 together form a first preset pattern P1, the shape of which determines the first image information that can be transmitted. When the display panel displays the first image information, the display panel controls all the second light-emitting units 22 to emit light. At this time, the first preset pattern P1 formed by all the second light-emitting units 22 is the encrypted information that the display panel needs to transmit.

[0116] In some embodiments, please refer to Figures 7 to 9 Multiple second light-emitting units 22 are arranged in an array. In step S110, the second light-emitting units 22 of the control section emit light and the second light-emitting units 22 of the control section do not emit light.

[0117] Multiple second light-emitting units 22 are arranged side by side in the row and column directions of the display panel. By controlling whether different second light-emitting units 22 emit light or not, the display panel can display different first image information.

[0118] For example, such as Figure 7 As shown in the figure, the multiple dashed boxes represent second pixel units A2 containing second light-emitting units 22. There are twelve second pixel units A2 in total, arranged in a four-row, three-column configuration. Figure 8 As shown, when the encrypted information is the number "6", it is necessary to control the second light-emitting unit 22 in the second and third second pixel units A2 located in the second row to not emit light; as Figure 9 As shown, when the encrypted information is the number "0", it is necessary to control the second light-emitting unit 22 in the second pixel unit A2 of the second row and the second pixel unit A2 of the third row to not emit light.

[0119] This application embodiment distributes multiple second light-emitting units 22 in an array and configures at least some of the second light-emitting units 22 to be turned off when displaying first image information, thereby enabling the display of different first image information and further satisfying the encryption requirements of the display panel.

[0120] While the embodiments disclosed in this application are as described above, the content is merely for the purpose of facilitating understanding of this application and is not intended to limit the invention. Any person skilled in the art to which this application pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope disclosed in this application; however, the scope of protection of this application shall still be determined by the scope defined in the appended claims.

[0121] The above description is merely a specific embodiment of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, substitutions for other connection methods described above can be made by referring to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application.

Claims

1. A display panel, characterized in that, include: Substrate; A light-emitting device layer is disposed on one side of the substrate. The light-emitting device layer includes a plurality of light-emitting units, including a first light-emitting unit and a second light-emitting unit. Under a first field of view, the first light-emitting unit and the second light-emitting unit have the same light-emitting effect. Wherein, the rate of change of the light emission characteristics of the first light-emitting unit with respect to the change of the field of view is different from the rate of change of the light emission characteristics of the second light-emitting unit, and at least a portion of the second light-emitting units are configured to emit light when displaying the first image information and to turn off when displaying the second image information; The display panel is configured such that when the first image information is displayed, the first light-emitting unit and the second light-emitting unit cooperate to emit light to form a display screen under the first field of view, the display screen does not display the first image information, and the second light-emitting unit protrudes from the first light-emitting unit under the second field of view to display the first image information; The first light-emitting unit includes a first light-emitting layer, the first light-emitting layer includes a first light-emitting material, and the second light-emitting unit includes a second light-emitting layer, the second light-emitting layer includes a second light-emitting material; The emission peak of the first luminescent material is different from that of the second luminescent material, and / or the half-width at half maximum (WHM) of the first luminescent material is different from that of the second luminescent material.

2. The display panel according to claim 1, characterized in that, In the second light-emitting unit, at least a portion of the film layer is inclined relative to the plane of the substrate on the surface away from the substrate.

3. The display panel according to claim 2, characterized in that, The first light-emitting unit includes a first light-emitting layer and a first electrode located on the side of the first light-emitting layer facing the substrate, the first electrode having a first surface facing away from the substrate; The second light-emitting unit includes a second light-emitting layer and a second electrode located on the side of the second light-emitting layer facing the substrate, the second electrode having a second surface facing away from the substrate; The first surface intersects with the second surface.

4. The display panel according to claim 3, characterized in that, The first surface is parallel to the plane containing the substrate.

5. The display panel according to claim 3, characterized in that, The second surface and the substrate have an angle α, where α ≤ 60°.

6. The display panel according to claim 1, characterized in that, The angle β between the first field of view and the thickness direction of the substrate is less than or equal to 30°.

7. The display panel according to claim 6, characterized in that, At the second field of view, the light emission effects of the first light-emitting unit and the second light-emitting unit are different, and the angle γ between the second field of view and the plane where the substrate is located is less than or equal to 60°.

8. The display panel according to claim 1, characterized in that, Multiple second light-emitting units together constitute a first preset pattern; and / or, Multiple second light-emitting units are distributed in an array, and at least some of the second light-emitting units are configured to be turned off when displaying the first image information.

9. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 8.

10. A display method, characterized in that, include: Acquire image information; When the image information is the first image information, the first light-emitting unit and the second light-emitting unit are controlled to emit light. Under the first field of view, the first light-emitting unit and the second light-emitting unit have the same light-emitting effect. The first light-emitting unit and the second light-emitting unit cooperate to emit light to form a display screen under the first field of view. The display screen does not display the first image information. The rate of change of the light-emitting characteristics of the first light-emitting unit relative to the change of the field of view is different from the rate of change of the light-emitting characteristics of the second light-emitting unit, so that the second light-emitting unit stands out from the first light-emitting unit under the second field of view. The first light-emitting unit includes a first light-emitting layer, the first light-emitting layer includes a first light-emitting material, and the second light-emitting unit includes a second light-emitting layer, the second light-emitting layer includes a second light-emitting material; The emission peak of the first luminescent material is different from that of the second luminescent material, and / or the half-width at half maximum (WHM) of the first luminescent material is different from that of the second luminescent material.

11. The display method according to claim 10, characterized in that, After acquiring the image information, the following is included: When the image information is the second image information, the second light-emitting unit is controlled to turn off.

12. The display method according to claim 10, characterized in that, Multiple second light-emitting units together form a first preset pattern, and the first preset pattern is the same as the first image information; In the step of controlling the first light-emitting unit and the second light-emitting unit to emit light when the image information is the first image information, all the second light-emitting units are controlled to emit light so that all the second light-emitting units display the first image information under the second field of view.

13. The display method according to claim 10, characterized in that, Multiple second light-emitting units are arranged in an array; In the step of controlling the first light-emitting unit and the second light-emitting unit to emit light when the image information is the first image information, a portion of the second light-emitting unit is controlled to emit light and a portion of the second light-emitting unit is controlled not to emit light.

Images