Anti-peep display module and anti-peep display device

Abstract

The application provides a kind of peep-proof display module and peep-proof display device, wherein the peep-proof display module includes display substrate, a plurality of sub-pixels, reflection brightening layer and switchable peep-proof layer arranged in layers, a plurality of sub-pixels are arranged on the display substrate, each sub-pixel is used to emit a color light, the reflection brightening layer is arranged opposite to the plurality of sub-pixels, so that the light emitted by the plurality of sub-pixels is emitted through the reflection brightening layer, the reflection brightening layer includes at least one brightening film, the pitch of at least one brightening film is positively correlated with the wavelength of at least one color light, so that the brightening film reflects and brightens the color light emitted by the plurality of sub-pixels, increases the corresponding color light intensity, improves the light output efficiency of the peep-proof display module, and the switchable peep-proof layer is located on the side of the reflection brightening layer away from the display substrate, to realize the switching between the peep-proof state and the sharing state of the peep-proof display module, and realize the flexibility of the peep-proof display module.

Description

Technical Field

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

[0002] Privacy protection is one of the special requirements of display modules. That is, the module displays normally for a person looking directly at it, but for a person looking at it from a certain angle (e.g., 30°), the brightness of the module is significantly reduced or color information is significantly lost, so as to improve the privacy of the displayed information.

[0003] Currently, the solution for privacy displays is to stack a privacy film and a switchable privacy component. The transmittance of the privacy film is about 70%, and the transmittance of the switchable privacy component is about 70%. The stacking of the two results in a brightness reduction of about 50% in the display module, and the light output efficiency is low. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a privacy display module and a privacy display device to solve, to a certain extent or in part, the problem of low light efficiency in privacy displays.

[0005] For the purposes described above, this application provides a privacy display module, comprising:

[0006] Display substrate; Multiple sub-pixels are arrayed on the display substrate, and each sub-pixel is used to emit a color of light; A reflective brightening layer is located on the light-emitting side of the display substrate. The orthographic projection of the reflective brightening layer on the display substrate at least partially overlaps with the orthographic projection of the sub-pixel on the display substrate. The reflective brightening layer includes at least one brightening film. The pitch of the at least one brightening film is positively correlated with the wavelength of at least one of the colored lights. The reflective brightening layer is used to increase the light emission intensity of the corresponding colored light. A switchable privacy layer is located on the side of the reflective brightening layer away from the display substrate. The switchable privacy layer is used to switch between the privacy mode and the shared mode of the privacy display module.

[0007] Furthermore, the reflective brightening layer comprises only one brightening film, which includes multiple brightening sub-films arranged in an array. Each brightening sub-film is correspondingly disposed to one of the sub-pixels, and the pitch of the brightening sub-film is positively correlated with the wavelength of the color light emitted by the corresponding sub-pixel.

[0008] Furthermore, the privacy display module also includes a light-shielding layer, which is located between the reflective brightening layer and the sub-pixel. The light-shielding layer includes a plurality of light-shielding sub-layers arranged in an array. The orthographic projection of the pixel opening of each sub-pixel on the display substrate is at least partially located between the orthographic projections of two adjacent light-shielding sub-layers on the display substrate. The orthographic projection of the brightening film on the display substrate at least partially covers the orthographic projection of the light-shielding layer on the display substrate.

[0009] Furthermore, the orthographic projections of two adjacent light-shielding sublayers on the display substrate cover the edge of the orthographic projection of the corresponding brightness-enhancing subfilm on the display substrate.

[0010] Furthermore, the colored light is a first colored light, a second colored light, or a third colored light; the reflective brightening layer includes at least three brightening films, the at least three brightening films including a first film, a second film, and a third film, the pitch of the first film is positively correlated with the wavelength of the first colored light, the pitch of the second film is positively correlated with the wavelength of the second colored light, and the pitch of the third film is positively correlated with the wavelength of the third colored light.

[0011] Furthermore, each of the first film, the second film, and the third film is provided, and the thickness of the first film, the second film, and the third film increases sequentially, with the direction of the thickness being perpendicular to the display substrate.

[0012] Furthermore, the thickness of the first film, the thickness of the second film, and the thickness of the third film are all the same, and the direction of the thickness is perpendicular to the direction of the display substrate. The number of the first film, the number of the second film, and the number of the third film increase sequentially.

[0013] Furthermore, the privacy display module also includes a reflective linear polarizer, which is located between the reflective brightening layer and the switchable privacy layer.

[0014] Furthermore, the switchable privacy layer includes a first electrode layer, a polymer liquid crystal layer, a second electrode layer, and a first polarizer stacked sequentially, with the first electrode layer disposed close to the reflective linear polarizer.

[0015] Furthermore, the switchable privacy layer includes at least two privacy units stacked together, with at least one second polarizer between two adjacent privacy units. Each privacy unit includes a first electrode layer, a polymer liquid crystal layer, and a second electrode layer stacked sequentially. Along the direction from the display substrate toward the switchable privacy layer, the first electrode layer of the first privacy unit is disposed close to the reflective linear polarizer, and a third polarizer is disposed on the second electrode layer of the last privacy unit.

[0016] Based on the same inventive concept, this application also provides a privacy display device, comprising: The privacy display module as described above; and A driving circuit, electrically coupled to the privacy display module, is configured to provide a driving signal to the privacy display module. A signal conversion unit is configured to receive user commands and convert the user commands into driving signals to adjust the state of the privacy display module.

[0017] As can be seen from the above description, this application provides a privacy display module and a privacy display device. The privacy display module includes a stacked display substrate, multiple sub-pixels, a reflective brightness enhancement layer, and a switchable privacy layer. The multiple sub-pixel array is disposed on the display substrate, and each sub-pixel emits a color of light. The reflective brightness enhancement layer is disposed opposite to the multiple sub-pixels so that the light emitted by the multiple sub-pixels passes through the reflective brightness enhancement layer. The reflective brightness enhancement layer includes at least one brightness enhancement film, and the pitch of the at least one brightness enhancement film is positively correlated with the wavelength of at least one color of light, so that the brightness enhancement film... This invention enhances the light intensity of the corresponding color light emitted by multiple sub-pixels by reflecting and brightening the light emitted from them, thereby improving the light emission efficiency of the privacy display module. The switchable privacy layer is located on the side of the reflective brightening layer away from the display substrate, which enables the privacy display module to switch between privacy mode and shared mode, thus achieving flexibility in the use of the privacy display module. This application increases the light emission intensity of the corresponding color light of the sub-pixels by setting a reflective brightening layer between multiple sub-pixels and the switchable privacy layer, thereby increasing the light emission intensity of the switchable privacy layer and improving the light emission efficiency of the privacy display module. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an existing privacy display module; Figure 2 This is a schematic diagram of the structure of a privacy display module according to an embodiment of this application. Figure 1 ; Figure 3 This is a schematic diagram of the structure of the reflective brightening layer in an embodiment of this application. Figure 1 ; Figure 4 This is a schematic diagram of the structure of the reflective brightening layer in an embodiment of this application. Figure 2 ; Figure 5This is a schematic diagram of the structure of the reflective brightening layer in an embodiment of this application. Figure 3 ; Figure 6 This is a schematic diagram of the structure of a privacy display module according to an embodiment of this application. Figure 2 ; Figure 7 This is a schematic diagram illustrating the light-shielding principle of the light-shielding layer on the reflective brightening layer in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of a privacy display module according to an embodiment of this application. Figure 3 ; Figure 9 A comparison diagram of the emitted light from a conventional polarizer and a reflective linear polarizer; Figure 10 This is a schematic diagram of the switchable privacy layer in the embodiments of this application. Figure 1 ; Figure 11 In this embodiment of the application, the polymer liquid crystal layer in the switchable privacy layer is a formal polymer liquid crystal layer, and the structural diagram of the polymer liquid crystal layer when the switchable privacy layer is not powered on is shown. Figure 12 This is a schematic diagram of the polymer liquid crystal layer in the switchable privacy layer in this embodiment of the application, which is a formal polymer liquid crystal layer. The diagram shows the structure of the polymer liquid crystal layer when the switchable privacy layer is powered on. Figure 13 This embodiment of the application shows a schematic diagram of the polymer liquid crystal layer in the switchable privacy layer when the polymer liquid crystal layer is not powered on, which is an inverse polymer liquid crystal layer. Figure 14 In this embodiment of the application, the polymer liquid crystal layer in the switchable privacy layer is an inverse polymer liquid crystal layer. The schematic diagram of the polymer liquid crystal layer structure when the switchable privacy layer is powered on is shown. Figure 15 This is a schematic diagram of the switchable privacy layer in the embodiments of this application. Figure 2 ; Figure 16 This is a schematic flowchart illustrating a method for preparing a privacy display module according to an embodiment of this application.

[0020] In the diagram: OLED panel, display screen; LCF, privacy film; SVC, switchable privacy component; Rear Pol, backlight polarizer; Front Pol, light-emitting polarizer; 100, Display substrate; 200, Subpixel; 300, Reflective brightening layer; 300 310. Brightness enhancement film; 320. First film; 330. Third film; 340. Brightness enhancement sub-film; 400. Switchable privacy layer; 410. First electrode layer; 420. Polymer liquid crystal layer; 430. Second electrode layer; 440. First polarizer; 450. Second polarizer; 460. Third polarizer; 470. Substrate layer; 480. Sealant; 500. Light-shielding layer; 510. Light-shielding sub-layer; 600. Reflective linear polarizer; 700. Ordinary polarizer. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Smartphones, laptops, and tablets have become necessities for work and life. People frequently use these devices in public places, and their screens are easily seen by others, leading to the leakage of trade secrets and personal privacy. Therefore, the demand for built-in privacy features in devices has surged. Traditional privacy solutions involve adding a privacy screen protector, which has a venetian blind structure. While providing privacy, this reduces screen brightness and clarity, and even in scenarios where privacy is not a concern, it cannot restore the optimal visual experience. Therefore, switchable privacy protection has become an inevitable development direction.

[0024] Currently, such as Figure 1As shown, the solution for achieving switchable privacy in a display device involves stacking a privacy film LCF and a switchable privacy component SVC on the OLED panel. A backlight polarizer RearPol is placed on the backlight side of the switchable privacy component SVC, and a light-emitting polarizer FrontPol is placed on the light-emitting side of the switchable privacy component SVC. This allows the display device to switch between different privacy levels (when the switchable privacy component SVC is in the shared state, the privacy angle of the display device is related to the privacy film LCF, and the privacy level is low; when the switchable privacy component SVC is in the privacy state, the privacy angle of the display device is related to both the privacy film LCF and the switchable privacy component SVC, and the privacy level is high). The transmittance of the privacy film LCF is about 70%, and the transmittance of the switchable privacy component SVC is about 70%. The superposition of the two results in a brightness reduction of about 50% for the display device. To achieve the same brightness, the power consumption increases by about 100%, and the device lifespan is also significantly reduced.

[0025] Based on this, this application proposes a privacy display module and a privacy display device to improve light emission efficiency while achieving switchable privacy.

[0026] The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0027] In some embodiments, such as Figure 2 As shown, this application provides a privacy display module, including: Display substrate 100; Multiple sub-pixels 200 are arrayed on the display substrate 100, and each sub-pixel 200 is used to emit a color of light; A reflective brightness enhancement layer 300 is located on the light-emitting side of the display substrate 100. The orthographic projection of the reflective brightness enhancement layer 300 on the display substrate 100 at least partially overlaps with the orthographic projection of the sub-pixel 200 on the display substrate 100. The reflective brightness enhancement layer 300 includes at least one brightness enhancement film 300. The at least one brightening film 300 The pitch of the helix is ​​positively correlated with the wavelength of at least one of the colors of light, and the reflective brightening layer 300 is used to increase the light intensity of the corresponding color of light; A switchable privacy layer 400 is located on the side of the reflective brightening layer 300 away from the display substrate 100. The switchable privacy layer 400 is used to switch between the privacy mode and the shared mode of the privacy display module.

[0028] Specifically, a driving circuit layer is provided between the display substrate 100 and the sub-pixels 200. The driving circuit layer is used to drive the corresponding sub-pixels 200 to emit a color of light. Different sub-pixels 200 can emit different colors of light, or they can emit the same color of light. The color of light can be red, green, blue, or white light, and is not limited here.

[0029] Multiple buffer layers or functional layers may be provided between the sub-pixel 200 and the reflective brightening layer 300, such as a planarization layer or an encapsulation layer. The sub-pixel 200 includes a stacked anode, a light-emitting layer, and a cathode, with the anode disposed close to the display substrate 100.

[0030] There are various ways to arrange the array of multiple sub-pixels 200 on the display substrate 100. The specific arrangement depends on the actual situation and is not limited here.

[0031] The reflective brightening layer 300 includes at least one brightening film 300. Brightening film 300 The number of settings and the 300 brightness enhancement film The setting depends on the number of colored lights that need to be enhanced. Brightening film 300 The pitch needs to be positively correlated with the wavelength of each enhanced color light in order to ensure the brightness enhancement film 300 It can enhance the intensity of the corresponding color light.

[0032] Taking the example of multiple sub-pixels 200 that can emit three different colors of light respectively, and the intensity of each of the three different colors of light needs to be enhanced, for the brightness enhancement film 300 The number of settings and their locations will be described in detail.

[0033] When the brightening film 300 When the number of layers is three or more, the brightness enhancement film for each layer is 300. Brightening films with the same pitch but different layers can be 300. Different pitches are possible, as long as each color of light wavelength has at least one corresponding brightening film of 300. The brightness enhancement film 300 The pitch of the screw thread is positively correlated with the wavelength of the light of that color; that is, the longer the wavelength of the light of that color, the better the brightness enhancement film. The larger the pitch, the better. This is because the brightness enhancement film has a 300mm pitch. The pitch of the screw is determined by the wavelength of the corresponding color light, and thus the brightness enhancement film 300 It can reflect light of that color, thereby increasing the intensity of that color light.

[0034] When the reflective brightening layer 300 includes a brightening film 300 At times, such as Figure 3 and Figure 4 As shown, this brightness enhancement film 300 The system may include three different pitch sub-films 340, each with a pitch that matches the wavelength of a color light. The brightness enhancement sub-films 340 with this pitch are stacked on the sub-pixel 200 that emits its corresponding color light to enhance the intensity of the color light emitted by the sub-pixel 200. The three different pitch brightness enhancement sub-films 340 are arranged in an array, and the array arrangement is the same as that of the sub-pixel 200.

[0035] When the reflective brightening layer 300 includes three brightening films 300 At times, such as Figure 5 As shown, the three-layer brightness enhancement film 300 These correspond to three different pitches, namely 300mm per layer of brightening film. It has a pitch, each pitch being matched to the wavelength of a different color of light, thus allowing different colors of light to pass through the three-layer brightness enhancement film 300. During emission, the brightness enhancement film 300, with a pitch matching the wavelength of the light of that color, is applied. It can reflect light of this color, increasing the intensity of the emitted light; the three-layer brightness enhancement film is 300. In the middle, each layer of brightening film is 300 The three-layer brightness enhancement film 300 reflects one color of light, and can reflect all three colors of light emitted by multiple sub-pixels 200, thereby increasing the light intensity emitted by the multiple sub-pixels 200. The layers are stacked, and the brightness enhancement films of adjacent layers are 300. They are connected together by an optical adhesive layer.

[0036] For example, the brightness enhancement film 300 For cholesteric liquid crystal films, the relationship between the wavelength of light reflected by the cholesteric liquid crystal film and its pitch is as follows:

[0037] in, The wavelength of the reflected light; The average refractive index of the liquid crystal is approximately 1.5-1.6. The pitch of the helix; The angle between the incident light and the helical axis.

[0038] More specifically, the colored light emitted through the reflective brightening layer 300 is emitted through the switchable privacy layer 400. The switchable privacy layer 400 has two states: a privacy state and a sharing state. When it is in the privacy state, it can only emit colored light within a corresponding angle, thus achieving the privacy state of the display module. When it is in the sharing state, the angle of the emitted colored light is greater than that in the privacy state, thus achieving the sharing state of the display module. The state switching of the switchable privacy layer 400 is achieved under electronic control, which facilitates the flexibility of the privacy display module in switching between the privacy state and the sharing state.

[0039] In this embodiment, the privacy display module includes a display substrate 100, a plurality of sub-pixels 200, a reflective brightening layer 300, and a switchable privacy layer 400 stacked together. The plurality of sub-pixels 200 are arrayed on the display substrate 100, and each sub-pixel 200 emits a color of light. The reflective brightening layer 300 is disposed opposite to the plurality of sub-pixels 200 so that the light emitted by the plurality of sub-pixels 200 passes through the reflective brightening layer 300. The reflective brightening layer 300 includes at least one brightening film 300. At least one layer of brightening film 300 The pitch of the screw is positively correlated with the wavelength of at least one color of light, so that the brightness enhancement film 300 The reflective brightening layer 400 is used to reflect and enhance the color light emitted by multiple sub-pixels 200, thereby increasing the light intensity of the corresponding color light and improving the light emission efficiency of the privacy display module. The switchable privacy layer 400 is located on the side of the reflective brightening layer 300 away from the display substrate 100, so as to realize the switching between the privacy display module and the shared state, thereby realizing the flexibility of the privacy display module. This application increases the light intensity of the color light corresponding to the sub-pixels 200 by setting the reflective brightening layer 300 between the multiple sub-pixels 200 and the switchable privacy layer 400, thereby increasing the light emission intensity of the switchable privacy layer 400 and improving the light emission efficiency of the privacy display module.

[0040] In some embodiments, such as Figure 3 , Figure 4 and Figure 6 As shown, the reflective brightening layer 300 consists of only one brightening film 300. The brightness enhancement film 300 The system includes multiple brightness enhancement sub-films 340 arranged in an array, each brightness enhancement sub-film 340 corresponding to a sub-pixel 200, and the pitch of the brightness enhancement sub-film 340 is positively correlated with the wavelength of the color light emitted by the corresponding sub-pixel 200.

[0041] Specifically, the array arrangement of the multiple brightness enhancement sub-films 340 is the same as the array arrangement of their corresponding multiple sub-pixels 200, in order to increase the light emission intensity of each sub-pixel 200. The pitch of the brightness enhancement sub-film 340 is positively correlated with the wavelength of the color light emitted by its corresponding sub-pixel 200; that is, the larger the wavelength of the color light emitted by the sub-pixel 200, the larger the pitch of its corresponding brightness enhancement sub-film 340, thereby enhancing the intensity of the color light emitted by the sub-pixel 200. The array of multiple brightness enhancement sub-films 340 constitutes the reflective brightness enhancement layer 300, which is a single layer in the direction perpendicular to the display substrate 100.

[0042] For example, the brightness enhancement sub-film 340 is a cholesteric liquid crystal film.

[0043] In this embodiment, the reflective brightening layer 300 includes only one brightening film 300. The brightness enhancement film 300 The system includes multiple brightness enhancement sub-films 340 arranged in multiple arrays. Each brightness enhancement sub-film 340 corresponds to a sub-pixel 200, and the pitch of the brightness enhancement sub-film 340 is positively correlated with the wavelength of the color light emitted by its corresponding sub-pixel 200, so as to enhance the intensity of the color light emitted by the sub-pixel 200. This allows the thickness of the reflective brightness enhancement layer 300 to be reduced without affecting the reflective effect of the reflective brightness enhancement layer 300, thereby reducing the thickness of the privacy display module.

[0044] In some embodiments, such as Figure 2 , Figure 6 and Figure 7 As shown, the privacy display module further includes a light-shielding layer 500, which is located between the reflective brightening layer 300 and the sub-pixel 200. The light-shielding layer 500 includes a plurality of light-shielding sub-layers 510 arranged in an array. The orthographic projection of the pixel opening of each sub-pixel 200 onto the display substrate 100 is at least partially located between the orthographic projections of two adjacent light-shielding sub-layers onto the display substrate 100. The brightening film 300... The orthographic projection on the display substrate 100 at least partially covers the orthographic projection of the light-shielding layer 500 on the display substrate 100.

[0045] Specifically, the light-shielding layer 500 is used to limit the light emission angle of the sub-pixel 200, achieving privacy protection within a certain angle. The light-shielding layer 500 can be configured as one layer or multiple layers. The light-shielding sub-layer 510 is located between two adjacent sub-pixels 200 to separate the pixel openings of the two adjacent sub-pixels 200, thereby limiting the light emission angle of the sub-pixel 200. The brightness enhancement film 300... Used to enhance the brightness of the colored light emitted by the sub-pixel 200 through the light-shielding layer 500, thereby enhancing the brightness of the brightening film 300. The orthogonal projection on the display substrate 100 at least partially covers the orthogonal projection of the light-shielding layer 500 on the display substrate 100, so that the light-shielding layer 500 supports the brightness enhancement film, which is beneficial to the brightness enhancement film 300. The stability of the settings.

[0046] In addition, such as Figure 7 As shown, the light-shielding layer 500 not only restricts the light emission angle of the sub-pixel 200, but also restricts the brightness enhancement film 300. The angle of the reflected light, i.e., avoiding the brightening film 300. Reflecting the emitted light from various angles reduces the brightness of the emitted light within a certain angle range, which is beneficial for the privacy protection of the privacy display module.

[0047] It should be noted that the light-shielding layer 500 can be a black matrix layer (which can be a color filter layer with black matrix function) or a separately provided light-shielding layer 500. When the privacy display module is applied to a display device with a black matrix layer, the light-shielding layer 500 is not required. When the privacy display module is applied to a display device without a black matrix layer, the light-shielding layer 500 must be provided.

[0048] In some embodiments, such as Figure 6 As shown, the orthographic projections of two adjacent light-shielding sublayers 510 on the display substrate 100 cover the edge of the orthographic projection of the corresponding brightness enhancement subfilm 340 on the display substrate 100.

[0049] Specifically, when the orthographic projections of two adjacent light-shielding sub-layers 510 on the display substrate 100 cover the edge of the orthographic projection of the corresponding brightness enhancement sub-film 340 on the display substrate 100, the edges of the brightness enhancement sub-film 340 are all located on the light-shielding sub-layer 510 corresponding to its corresponding pixel opening, so that the brightness enhancement film completely covers the area of ​​the sub-pixel 200 emitting light through the light-shielding layer 500, thereby avoiding the appearance of the brightness enhancement film 300. The color light emitted by the sub-pixel 200 through the light-shielding layer 500 cannot be enhanced in brightness, which is beneficial to improving the brightness enhancement film 300. The brightness uniformity of the colored light emitted by the sub-pixel 200 is enhanced.

[0050] In some embodiments, such as Figure 8 As shown, the colored light is a first color light, a second color light, or a third color light; the reflective brightening layer 300 includes at least three brightening films 300. The at least three-layer brightness enhancement film includes a first film 310, a second film 320, and a third film 330. The pitch of the first film 310 is positively correlated with the wavelength of the first color light, the pitch of the second film 320 is positively correlated with the wavelength of the second color light, and the pitch of the third film 330 is positively correlated with the wavelength of the third color light.

[0051] Specifically, the colored light emitted by the multiple sub-pixels 200 includes a first colored light, a second colored light, and a third colored light, and thus the reflective brightening layer 300 includes at least three brightening films 300. To ensure that each color of light has a corresponding brightening film of 300. This is to enhance the intensity of the emitted light of that color.

[0052] The at least three-layer brightening film 300 The reflective brightening layer 300 includes a first film 310, a second film 320, and a third film 330. The pitch of the first film 310 is positively correlated with the wavelength of the first color light to reflect the first color light and enhance its output intensity. The pitch of the second film 320 is positively correlated with the wavelength of the second color light to reflect the second color light and enhance its output intensity. The pitch of the third film 330 is positively correlated with the wavelength of the third color light to reflect the third color light. The reflective brightening layer 300 includes at least these three stacked brightening films 300. This allows for the simultaneous reflection of three colors of light emitted from multiple sub-pixels 200, avoiding the need to set different pitches for the brightness enhancement film 300 based on the arrangement of the sub-pixels 200. This is beneficial to improving the manufacturing efficiency of the privacy display module.

[0053] It should be noted that the number of layers of the reflective brightening layer 300 can be flexibly set according to actual application needs, but it must include the first film 310, the second film 320 and the third film 330 (that is, the number of the first film 310, the second film 320 and the third film 330 must be greater than or equal to 1) to ensure that the reflective brightening layer 300 reflects the three colors of light emitted by the multiple sub-pixels 200, which is beneficial to enhancing the intensity of the colors of light emitted by the sub-pixels 200.

[0054] In some embodiments, the first film 310, the second film 320 and the third film 330 are each provided, and the thickness of the first film 310, the thickness of the second film 320 and the thickness of the third film 330 increase sequentially, and the direction of the thickness is perpendicular to the display substrate 100.

[0055] Specifically, the reflective brightening film includes a first film 310, a second film 320, and a third film 330, so as to simultaneously reflect the first color light, the second color light, and the third color light without additionally setting the first film 310, the second film 320, or the third film 330, that is, without increasing the thickness of the reflective brightening film, thereby simultaneously enhancing the color light emitted by multiple sub-pixels 200, without needing to set the first film 310, the second film 320, and the third film 330 based on the color light array emitted by the sub-pixels 200, which is beneficial to improving the manufacturing efficiency of the privacy display module.

[0056] The wavelength of the first color light is shorter than the wavelength of the second color light, which is shorter than the wavelength of the third color light. That is, the first color light is blue light, the second color light is green light, and the third color light is red light. Consequently, the pitch of the first film 310 is shorter than the pitch of the second film 320, which is shorter than the pitch of the third film 330. By setting the thickness of the first film 310, the thickness of the second film 320, and the thickness of the third film 330 to increase sequentially, the number of spirals of the first film 310, the second film 320, and the third film 330 are the same. Consequently, the reflection efficiency of the first film 310 for the first color light, the reflection efficiency of the second film 320 for the second color light, and the reflection efficiency of the third film 330 for the third color light are the same. As a result, the enhancement effect of the reflective brightening layer 300 on the three colors of light is the same, which is beneficial to achieving uniform light intensity of the privacy display module.

[0057] In some embodiments, the thickness of the first film 310, the thickness of the second film 320, and the thickness of the third film 330 are all the same, and the direction of the thickness is perpendicular to the display substrate 100. The number of the first film 310, the number of the second film 320, and the number of the third film 330 increase sequentially.

[0058] Specifically, based on the fact that the thickness of the first film 310, the second film 320, and the third film 330 are the same, the number of the first film 310, the number of the second film 320, and the number of the third film 330 are set to increase sequentially. This is equivalent to the thickness of the film layer that can reflect the first color light, the thickness of the film layer that can reflect the second color light, and the thickness of the film layer that can reflect the third color light increasing sequentially. This makes the number of spirals of the film layers that can reflect the first color light, the second color light, and the third color light the same, so that the reflection efficiency of the reflective brightening layer 300 for the first color light, the reflection efficiency for the second color light, and the reflection efficiency for the third color light are the same. This makes the enhancement effect of the reflective brightening layer 300 on the three colors of light the same, which is beneficial to achieving the uniformity of the light intensity emitted by the privacy display module.

[0059] In some embodiments, such as Figure 2 , Figure 7 and Figure 8 As shown, the privacy display module also includes a reflective linear polarizer 600, which is located between the reflective brightening layer 300 and the switchable privacy layer 400.

[0060] Specifically, the polarization principle of the reflective linear polarizer 600 utilizes multilayer thin-film interference and Brewster's angle effect to selectively reflect and transmit incident light at a specific angle, thereby achieving efficient polarization separation. In contrast, the ordinary polarizer 700 only has transmission capabilities and lacks reflection capabilities. Figure 9 As shown, when unpolarized light is incident on the multilayer film interface at an angle close to Brewster's angle, the parallel polarized light (P-light) has extremely low reflectivity and passes through the reflective linear polarizer 600. The vertically polarized light (S-light) has relatively high reflectivity. The light reflected back from each layer interface undergoes constructive interference and is reflected by the reflective linear polarizer 600. The vertically polarized light is then decomposed into parallel polarized light and vertically polarized light again after reflection. The vertically polarized light is converted into parallel polarized light through multiple reflections, significantly increasing the light extraction efficiency. Placing the reflective linear polarizer 600 between the reflective brightening layer 300 and the switchable privacy layer 400 can enhance the light extraction efficiency on top of the enhanced light extraction intensity of the reflective brightening layer 300, thereby increasing the intensity of light incident on the switchable privacy layer 400, and ultimately increasing the light extraction intensity of the privacy display component.

[0061] In some embodiments, such as Figure 8 , Figure 10 and Figure 11 As shown, the switchable privacy layer 400 includes a first electrode layer 410, a polymer liquid crystal layer 420, a second electrode layer 430 and a first polarizer 440 stacked in sequence, with the first electrode layer 410 disposed close to the reflective linear polarizer 600.

[0062] Specifically, the first electrode layer 410 and the second electrode layer 430 are used to energize or de-energize the polymer liquid crystal layer 420 to realize the privacy state or shared state of the switchable privacy layer 400, thereby realizing the privacy state or shared state of the privacy display module.

[0063] The polymer liquid crystal layer 420 can be a formal polymer liquid crystal layer 420 comprising positive liquid crystal and polymer, or an inverse polymer liquid crystal layer 420 comprising negative liquid crystal and polymer. It should be noted that the outer edges of the polymer liquid crystal layer 420 are provided with sealant 480 to work together with the first electrode layer 410 and the second electrode layer 430 to seal the polymer liquid crystal layer 420, preventing liquid crystal leakage and external contamination.

[0064] When the polymer liquid crystal layer 420 is a formal polymer liquid crystal layer 420, when the first electrode layer 410 and the second electrode layer 430 stop applying power to the polymer liquid crystal layer 420, the liquid crystal molecules within the polymer liquid crystal layer 420 are in a disordered state, such as... Figure 11 As shown, the refractive index of the liquid crystal and the polymer differs significantly in the polarization direction of the incident light. Light is refracted at the interface between the liquid crystal droplets and the polymer, and the light rays are emitted in all directions, exhibiting a shared state. When the first electrode layer 410 and the second electrode layer 430 apply electricity to the polymer liquid crystal layer 420, the liquid crystal molecules within the polymer liquid crystal layer 420 are driven by the electric field to align vertically (perpendicular to the direction of the display substrate 100), as... Figure 12 As shown, the refractive index of the liquid crystal is similar to that of the polymer in the polarization direction of the incident light. The light does not refract at the interface between the liquid crystal and the polymer, and the light is emitted in a perpendicular direction, which is a privacy protection state.

[0065] When the polymer liquid crystal layer 420 is an inverted polymer liquid crystal layer 420, when the first electrode layer 410 and the second electrode layer 430 stop applying power to the polymer liquid crystal layer 420, the liquid crystal molecules in the polymer liquid crystal layer 420 are driven by the electric field to align vertically (perpendicular to the direction of the display substrate 100), such as... Figure 13 As shown, the refractive index of the liquid crystal in the incident light polarization direction is similar to that of the polymer. Light does not refract at the interface between the liquid crystal and the polymer, and the light rays exit perpendicularly, thus preventing privacy. When the first electrode layer 410 and the second electrode layer 430 apply electricity to the polymer liquid crystal layer 420, the liquid crystal molecules within the polymer liquid crystal layer 420 are in a disordered state, such as... Figure 14 As shown, the refractive index of the liquid crystal and the refractive index of the polymer differ greatly in the polarization direction of the incident light. The light is refracted at the interface between the liquid crystal droplets and the polymer, and the light rays are emitted in all directions, which is a shared state.

[0066] The first electrode layer 410 of the switchable privacy layer 400 is disposed near the reflective linear polarizer 600, and the second electrode layer 430 of the switchable privacy layer 400 is disposed near the first polarizer 440, thereby achieving polarization of the incident light and the outgoing light of the switchable privacy layer 400. These two polarizers, in conjunction with the liquid crystal deflection in the switchable privacy layer 400, achieve light control. The reflective linear polarizer 600 converts the incident light into unidirectional polarized light, and the liquid crystal molecules within the switchable privacy layer 400 are deflected under voltage to change the polarization direction of the incident light. After the incident light is emitted from the privacy layer 400 and passes through the first polarizer 440, when the polarization direction of the incident light is parallel to the transmission axis of the first polarizer 440, the light completely passes through the first polarizer 440, and the privacy display module displays a white state. When the polarization direction of the incident light is perpendicular to the transmission axis of the first polarizer 440, the light cannot pass through the first polarizer 440, and the privacy display module displays a black state. When the polarization direction of the incident light is between perpendicular and parallel to the transmission axis of the first polarizer 440, the light partially passes through the first polarizer 440, and the privacy display module achieves intermediate grayscale brightness display.

[0067] In addition, a substrate layer 470 is provided between the second electrode layer 430 and the first polarizer 440, and between the first electrode layer 410 and the reflective linear polarizer 600, to provide rigid support for the switchable privacy layer 400 without affecting light emission, preventing the switchable privacy layer 400 from warping and deforming, and also protecting the switchable privacy layer 400 from mechanical damage and environmental corrosion, which helps to extend the service life of the switchable privacy layer 400, and thus helps to extend the service life of the privacy display module.

[0068] It should be noted that the first polarizer 440 can be a regular polarizer 700 or a polarizer of the same type as the reflective linear polarizer 600. When the first polarizer 440 is of the same type as the reflective linear polarizer 600, the light output efficiency of the privacy display module can be further enhanced.

[0069] In this embodiment, the switchable privacy layer 400 switches between a privacy state and a sharing state through the first electrode layer 410, the polymer liquid crystal layer 420, and the second electrode layer 430. The first polarizer 440 and the reflective linear polarizer 600 cooperate with the polymer liquid crystal layer 420 to control the light emitted through the switchable privacy layer 400, which is beneficial to realize the privacy state or sharing state of the privacy display module.

[0070] In some embodiments, such as Figure 15As shown, the switchable privacy layer 400 includes at least two privacy units stacked together. At least one second polarizer 450 is provided between two adjacent privacy units. Each privacy unit includes a first electrode layer 410, a polymer liquid crystal layer 420, and a second electrode layer 430 stacked in sequence. Along the direction from the display substrate 100 toward the switchable privacy layer 400, the first electrode layer 410 of the first privacy unit is disposed close to the reflective linear polarizer 600, and a third polarizer 460 is also provided on the second electrode layer 430 of the last privacy unit.

[0071] Specifically, the switchable privacy layer 400 includes at least two privacy units, each privacy unit including a first electrode layer 410, a polymer liquid crystal layer 420, and a second electrode layer 430, to achieve switching between a shared state and a privacy state. Setting at least two privacy units can improve the privacy performance of the privacy display module.

[0072] The second polarizer 450 is provided between two adjacent privacy units, and the third polarizer 460 is provided on the second electrode layer 430 of the last privacy unit. This enables control over the polarization direction of the light incident on the privacy unit and the polarization direction of the light emitted after passing through the privacy unit, which is beneficial for realizing the privacy state and shared state of the switchable privacy layer 400.

[0073] It should be noted that the second polarizer 450 and the third polarizer 460 can be ordinary polarizers 700 or polarizers of the same type as the reflective linear polarizer 600. When the second polarizer 450 or the third polarizer 460 is of the same type as the reflective linear polarizer 600, the light output efficiency of the privacy display module can be further enhanced.

[0074] In addition, each of the privacy units has a substrate layer 470 on both the side closest to and furthest from the reflective linear polarizer 600 to improve the lifespan of each privacy unit. Adjacent privacy units are stacked together using an optical adhesive layer, which helps improve the stability of the switchable privacy layer 400.

[0075] Based on the same inventive concept and in conjunction with the description of the display panels in the above embodiments, this embodiment provides a display device that has the corresponding technical effects of the display panels in the above embodiments, which will not be repeated here.

[0076] In some embodiments, a privacy display device includes: The privacy display module as described above; and A driving circuit, electrically coupled to the privacy display module, is configured to provide a driving signal to the privacy display module. A signal conversion unit is configured to receive user commands and convert the user commands into driving signals to adjust the state of the privacy display module.

[0077] Specifically, the user instruction refers to the instruction to switch the privacy mode (such as switching from shared mode to privacy mode or vice versa). The signal conversion unit includes a controller that converts the user instruction into a first data signal, a central processing unit (CPU) that processes the first data signal and generates a second data signal, and system software that responds to the second data signal. The system software responds to the second data signal to obtain the drive signal and sends it to the drive circuit. The drive circuit receives the drive signal and sends it to the privacy display module to realize the state switching of the privacy display module, such as switching from shared mode to privacy mode or vice versa.

[0078] The display device can be a product with image display function, such as: monitor, television, billboard, digital photo frame, laser printer with display function, telephone, mobile phone, personal digital assistant (PDA), digital camera, portable camcorder, viewfinder, navigator, vehicle, large wall area, home appliance, information query equipment (such as business query equipment of e-government, bank, hospital, power and other departments, monitor, etc.).

[0079] Based on the same inventive concept and in conjunction with the description of the privacy display modules in the above embodiments, this embodiment provides a method for preparing a privacy display module. This method has the corresponding technical effects of the privacy display modules in the above embodiments, which will not be repeated here.

[0080] In some embodiments, such as Figure 16 As shown, a method for manufacturing a privacy display module includes: Step S100: Provide display substrate 100; Step S200: A plurality of sub-pixels 200 are arrayed on the display substrate 100, and each sub-pixel 200 is used to emit a color of light; Step S300: A reflective brightening layer 300 is formed on the plurality of sub-pixels 200, the reflective brightening layer 300 comprising at least one brightening film 300. The at least one brightening film 300 The pitch of the helix is ​​positively correlated with the wavelength of at least one of the colors of light, and the reflective brightening layer 300 is used to increase the light intensity of the corresponding color of light; In step S400, a switchable privacy layer 400 is formed on the reflective brightening layer 300. The switchable privacy layer 400 is used to switch between the privacy mode and the sharing mode of the privacy display module.

[0081] Specifically, the privacy display module includes a stacked display substrate, multiple sub-pixels, a reflective brightening layer, and a switchable privacy layer. Multiple sub-pixel arrays are disposed on the display substrate, each sub-pixel emitting a color light. The reflective brightening layer is disposed opposite to the multiple sub-pixels, allowing the light emitted by the sub-pixels to pass through it. The reflective brightening layer includes at least one brightening film, the pitch of which is positively correlated with the wavelength of at least one color light. This allows the brightening film to reflect and brighten the color light emitted by the multiple sub-pixels, increasing the light intensity of the corresponding color light and improving the light emission efficiency of the privacy display module. The switchable privacy layer is located on the side of the reflective brightening layer away from the display substrate, enabling the privacy display module to switch between a privacy state and a shared state, thus achieving flexibility in its use. This application increases the light emission intensity of the color light corresponding to the sub-pixels by setting a reflective brightening layer between the multiple sub-pixels and the switchable privacy layer, thereby increasing the light emission intensity of the switchable privacy layer and improving the light emission efficiency of the privacy display module.

[0082] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims. The various embodiments in this application are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually.

[0083] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0084] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0085] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0086] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the claims of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A privacy display module, characterized in that, include: Display substrate; Multiple sub-pixels are arrayed on the display substrate, and each sub-pixel is used to emit a color of light; A reflective brightening layer is located on the light-emitting side of the display substrate. The orthographic projection of the reflective brightening layer on the display substrate at least partially overlaps with the orthographic projection of the sub-pixel on the display substrate. The reflective brightening layer includes at least one brightening film. The pitch of the at least one brightening film is positively correlated with the wavelength of at least one of the colored lights. The reflective brightening layer is used to increase the light emission intensity of the corresponding colored light. A switchable privacy layer is located on the side of the reflective brightening layer away from the display substrate. The switchable privacy layer is used to switch between the privacy mode and the shared mode of the privacy display module.

2. The privacy display module according to claim 1, characterized in that, The reflective brightening layer comprises only one brightening film, which includes multiple brightening sub-films arranged in an array. Each brightening sub-film is corresponding to a sub-pixel, and the pitch of the brightening sub-film is positively correlated with the wavelength of the color light emitted by the corresponding sub-pixel.

3. The privacy display module according to claim 2, characterized in that, It also includes a light-shielding layer, which is located between the reflective brightening layer and the sub-pixel. The light-shielding layer includes a plurality of light-shielding sub-layers arranged in an array. The orthographic projection of the pixel opening of each sub-pixel on the display substrate is at least partially located between the orthographic projections of two adjacent light-shielding sub-layers on the display substrate. The orthographic projection of the brightening film on the display substrate at least partially covers the orthographic projection of the light-shielding layer on the display substrate.

4. The privacy display module according to claim 3, characterized in that, The orthographic projections of two adjacent light-shielding sublayers on the display substrate cover the edge of the orthographic projection of the corresponding brightness-enhancing subfilm on the display substrate.

5. The privacy display module according to claim 1, characterized in that, The colored light is a first color light, a second color light, or a third color light; the reflective brightening layer includes at least three brightening films, the at least three brightening films including a first film, a second film, and a third film, the pitch of the first film is positively correlated with the wavelength of the first color light, the pitch of the second film is positively correlated with the wavelength of the second color light, and the pitch of the third film is positively correlated with the wavelength of the third color light.

6. The privacy display module according to claim 5, characterized in that, Each of the first film, the second film, and the third film is provided. The thickness of the first film, the second film, and the third film increases sequentially, and the direction of the thickness is perpendicular to the direction of the display substrate.

7. The privacy display module according to claim 5, characterized in that, The thickness of the first film, the thickness of the second film, and the thickness of the third film are all the same, and the direction of the thickness is perpendicular to the direction of the display substrate. The number of the first film, the number of the second film, and the number of the third film increase sequentially.

8. The privacy display module according to claim 1, characterized in that, It also includes a reflective linear polarizer located between the reflective brightening layer and the switchable privacy layer.

9. The privacy display module according to claim 8, characterized in that, The switchable privacy layer includes a first electrode layer, a polymer liquid crystal layer, a second electrode layer, and a first polarizer stacked in sequence, with the first electrode layer disposed close to the reflective linear polarizer.

10. The privacy display module according to claim 8, characterized in that, The switchable privacy layer includes at least two privacy units stacked together, with at least one second polarizer between two adjacent privacy units. Each privacy unit includes a first electrode layer, a polymer liquid crystal layer, and a second electrode layer stacked sequentially. Along the direction from the display substrate toward the switchable privacy layer, the first electrode layer of the first privacy unit is disposed close to the reflective linear polarizer, and a third polarizer is disposed on the second electrode layer of the last privacy unit.

11. A privacy display device, characterized in that, include: The privacy display module as described in any one of claims 1-10; as well as A driving circuit, electrically coupled to the privacy display module, is configured to provide a driving signal to the privacy display module. A signal conversion unit is configured to receive user commands and convert the user commands into driving signals to adjust the state of the privacy display module.

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