Display screen, display screen protective film, and electronic device

Abstract

To provide a display screen, a display screen protective film, and an electronic device.SOLUTION: A transmissive layer of a display screen has a first surface away from a display panel, an orthographic projection of each micro structural unit on the first surface and along a thickness direction is located in a pixel region, and a projection area of the micro structural unit is less than or equal to an area of the pixel region. The micro structural unit may be a curved surface. In this embodiment of this application, the pixel region may include a region in which a sub-pixel is located on the display panel, and a spaced region between the sub-pixel and another sub-pixel that is located around the sub-pixel and adjacent to the sub-pixel. In the foregoing display screen, each micro structural unit mainly bends a display light ray of one sub-pixel. This helps reduce a difference in light refraction degrees between different sub-pixels, and further helps optimize a flash point.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202010635326.7, entitled "Display Screen, Display Screen Protector, and Electronic Device," filed with the China National Intellectual Property Office on July 3, 2020, and incorporated herein by reference in its entirety.

[0002] The present application relates to the field of display screen technology, and in particular to display screens, display screen protectors, and electronic devices. [Background technology]

[0003] Paper reading is a well-known reading mode, such as reading books, newspapers, and manuals. Paper reading relies on an appropriate intensity of ambient light. The ambient light is irradiated onto the paper surface, reflected by the paper surface, and then received by the human eye. The ambient light reflected by the paper surface is a near-Lambertian reflection (a type of diffuse reflection), so there is no display interference caused by specular reflection. Especially when the ambient light is strong, the ambient light reflected by the paper surface is less harmful and more comfortable to the human eye compared with the specular reflection.

[0004] Considering this, paper-like display has also become one of the development trends of display screens. Paper-like display is to specially design the display screen to reduce the specular reflection of the display screen against the ambient light, so that the display screen can also achieve the display effect of reading paper. At present, common paper-like displays mainly include transmissive paper-like display and reflective paper-like display. Transmissive paper-like display is not dependent on ambient light, can be flexibly applied to more scenarios, and has a more stable user experience. It is expected that transmissive paper-like display will become the mainstream of paper-like display in the future.

[0005] At present, the transmissive paper-like display screen is mostly provided with a rough light exit surface so that the ambient light can be diffused on the light exit surface. Thus, the paper-like display effect is achieved. However, the rough light exit surface causes flash points on the display picture of the display screen. That is, the display picture has non-uniform chromaticity and brightness. Therefore, the current transmissive paper-like display screen still needs to be further improved. Summary of the Invention [Means for solving the problem]

[0006] In consideration of this, the present application provides a display screen, a display screen protection film, and an electronic device for suppressing flash points on the display screen and realizing a paper-like display.

[0007] According to a first aspect, an embodiment of the present application provides a display screen, mainly including a display panel and a transmissive layer, which are stacked in sequence. The display panel can generate a display light beam, and the transmissive layer can transmit the display light beam. In this embodiment of the present application, the transmissive layer has a first surface away from the display panel, the first surface includes a plurality of microstructure units, an orthogonal projection image of each microstructure unit along a thickness direction is located in a pixel region, and a projected area of ​​the microstructure unit is equal to or less than an area of ​​the pixel region. The microstructure unit may be a curved surface. In this embodiment of the present application, the pixel region can include a region where a subpixel is located on the display panel, and a separation region between the subpixel and another subpixel located around the subpixel and adjacent to the subpixel.

[0008] For example, the display panel may be an LED display panel, an OLED display panel, an LCD panel, etc. This embodiment of the present application is not limited thereto.

[0009] In the display screen provided in this embodiment of the present application, the orthogonal projection image of a single microstructure unit is located in a pixel area, and the projection area of ​​a single microstructure unit is equal to or less than the area of ​​the pixel area. In other words, the orthogonal projection image of a single microstructure unit covers only a part or all of the area where at most one subpixel is located. Since the orthogonal projection image of a single microstructure unit covers only a part or all of the area where at most one subpixel is located, the microstructure unit mainly bends the light beams generated by the subpixel. This can avoid to a certain extent that a single microstructure unit bends the light beams generated by different subpixels. Since a considerable amount of flash points will be generated when the microstructure unit bends the light beams of different subpixels differently, the intensity ratio of the three primary colors in the pixel is shifted, and thus a flash point is generated. Therefore, in the display screen provided in this embodiment of the present application, each microstructure unit mainly bends the display light beam of one subpixel. This helps to reduce the difference in the refraction degree of light beams between different subpixels, which is further helpful in optimizing the flash point.

[0010] To further suppress flash points, in a possible implementation, the orthogonal projection images of the at least two microstructure units are located within a sub-region of the pixel region, the sub-region including the region in which the sub-pixel is located and a spacing region between the sub-pixel and any adjacent sub-pixels.

[0011] The orthogonal projection images of at least two microstructure units located in a sub-region may also be understood as the maximum size of the microstructure unit being equal to or less than 1 / 2 of the pixel pitch. It has been found through research that when the maximum size of the microstructure unit exceeds 1 / 2 of the pixel pitch, the speckle area increases rapidly with the increase of the maximum size of the microstructure unit. When the maximum size of the microstructure unit exceeds the pixel pitch, the speckle reaches a larger value. In view of this, in the display screen provided in this embodiment of the present application, the orthogonal projection images of at least two microstructure units are located in a sub-region of the pixel region. In other words, the maximum size of the microstructure unit is equal to or less than 1 / 2 of the pixel pitch. This is helpful to control the speckle area within a small range and optimize the flash point.

[0012] In general, the height of each microstructure unit on the first surface is any value in the range [0.5 μm, 1.5 μm]. Specifically, the height of each microstructure unit may be 0.5 μm, or 1.5 μm, or any value greater than 0.5 μm and less than 1.5 μm. The height of each microstructure unit is the distance between the apex and the valley bottom of the microstructure unit. The apex of the microstructure unit is the point within the microstructure unit that is the maximum distance from the display panel. The valley bottom of the microstructure unit is the point within the microstructure unit that is the minimum distance from the display panel.

[0013] Furthermore, the height of each microstructure unit on the first surface may alternatively be any value in the range of [1.5 μm, 4 μm]. Specifically, the height of each microstructure unit may be 1.5 μm, or 4 μm, or any value greater than 1.5 μm and less than 4 μm.

[0014] In order to improve the paper-like display effect, in a possible implementation, the arithmetic mean height Ra of the multiple microstructure units in any length range on the first surface parallel to any direction of the display panel is any value in [0.1 μm, 1 μm]. Specifically, the arithmetic mean height Ra may be 0.1 μm, or 1 μm, or any value greater than 0.1 μm and less than 1 μm.

[0015] Furthermore, the arithmetic mean height Ra of the multiple microstructure units may alternatively be any value in the range [0.2 μm, 0.5 μm]. Specifically, the arithmetic mean height Ra may be 0.2 μm, or 0.5 μm, or any value greater than 0.2 μm and less than 0.5 μm.

[0016] The arithmetic mean height Ra represents the arithmetic mean value of the absolute value of the perpendicular distance between the tangential contour of a plurality of microstructure units and the centerline within an arbitrary length range on the vertical tangential plane along an arbitrary direction and the thickness direction. The centerline is a straight line on the vertical tangential plane parallel to an arbitrary direction, and the sum of the areas of the plurality of regions formed by the tangential contour and centerline of the plurality of microstructure units is equal to the sum of the areas of the plurality of regions formed by the tangential contour and centerline of every two adjacent microstructure units.

[0017] The arithmetic mean height Ra can reflect the average height of a plurality of microstructure units. When the arithmetic mean height Ra is too small, specular reflection will occur, which is not conducive to realizing the paper-like display effect. When the arithmetic mean height Ra is too large, the definition of the display screen will be reduced, and the display contrast will also be reduced in the ambient light. Therefore, in this embodiment of the present application, the arithmetic mean height Ra may be any value of [0.1 μm, 1 μm], which is conducive to maintaining the definition of the display screen and realizing the paper-like display. Moreover, when the arithmetic mean height Ra is any value of [0.2 μm, 0.5 μm], the paper-like display effect is good and the definition is high.

[0018] In order to improve the paper-like display effect, in a possible implementation, the density of the microstructure units on the first surface is 5000 / mm 2 That's all.

[0019] Specifically, any 1 mm 2 Within the plane range of 100 mm, there are at least 5000 microstructure units. It can be understood that if the density of the microstructure units on the first surface is too small, specular reflection will also occur on the first surface, which is not conducive to realizing the paper-like display effect. In view of this, in this embodiment of the present application, the density of the microstructure units on the first surface is set to 5000 / mm to prevent specular reflection from occurring on the first surface. 2 That's it. This helps to achieve a paper-like display effect.

[0020] To further suppress flash points, in a possible implementation, within any length range on the first surface parallel to any direction of the display panel, the ratio Ra / Rsm of the arithmetic mean height Ra of the multiple microstructure units to the average length Rsm of the contour curve elements of the multiple microstructure units is 0.5% or greater.

[0021] The arithmetic mean height Ra represents the arithmetic mean value of the absolute value of the perpendicular distance between the tangential contour of a plurality of microstructure units and the centerline within an arbitrary length range on the vertical tangential plane along an arbitrary direction and the thickness direction. The centerline is a straight line on the vertical tangential plane parallel to an arbitrary direction, and the sum of the areas of the plurality of regions formed by the tangential contour and centerline of the plurality of microstructure units is equal to the sum of the areas of the plurality of regions formed by the tangential contour and centerline of every two adjacent microstructure units.

[0022] The average length Rsm of the contour curve element represents the average value of the projected length on the center line of the connecting lines between the vertices of the tangent contours of every two adjacent microstructure units in the tangent contours of multiple microstructure units within any length range on the vertical tangent plane along any direction and thickness direction. The vertices of each tangent contour are the points in the tangent contour that are farthest from the display panel.

[0023] It has been found through research that a larger Ra / Rsm value helps to suppress flash points more. Therefore, in this embodiment of the present application, the value of Ra / Rsm is 0.5% or more to further suppress flash points.

[0024] In order to improve the paper-like display effect, in a possible implementation, within a deviation of 1° from the reflection angle, the attenuation of the reflected light of the first surface is 5% or less. 2 It has been found through research that in the medium luminance range, the relationship between the minimum visually perceptible difference luminance of the human eye and the background luminance follows Weber's law, and the ratio between the two is approximately equal to 0.017. In other words, when the modulation transfer function of the reflected image is 0.017 or more, the human eye can recognize the reflected image. In this application, the attenuation of the reflected light of the first surface is less than 5% within a deviation of 1° from the reflection angle, so that the modulation transfer function MTF of the reflected image is less than 0.17 and the user cannot recognize the specular reflection. This facilitates paper-like display.

[0025] In addition, in another possible implementation, within a deviation of 1° from the reflection angle, the attenuation of the reflected light of the first surface is an arbitrary value of [5%, 10%]. It is difficult for the user to observe the specular reflection. This makes it easier to display like paper.

[0026] To further suppress flash points, in a possible implementation, the display screen may further include an intermediate layer located between the display panel and the transmissive layer, the intermediate layer being configured to scatter display light.

[0027] It has been found through research that when the scattering degree of the display light is high, the flash point of the display screen will gradually decrease with the increase of the scattering degree of the display light. However, if the scattering ability of the first surface is improved excessively, the definition of the display screen will decrease. In consideration of this, in this embodiment of the present application, an intermediate layer is provided between the display panel and the transmissive layer. Based on the first surface, the intermediate layer further improves the scattering degree of the display light to suppress the flash point of the display screen. In addition, compared with the transmissive layer, the intermediate layer may be provided at a position closer to the display panel. This helps to reduce the impact on the definition of the display screen.

[0028] The intermediate layer may be a layer newly added to the original display screen structure, or may be an existing functional layer in the display screen. In other words, in addition to scattering the display light, the intermediate layer may further realize another function. An example is as follows:

[0029] For example, the intermediate layer may include an optical adhesive layer. The optical adhesive layer can not only adhere the display panel to the transmissive layer, but also scatter the display light. In a possible implementation, the intermediate layer can include a first optical adhesive layer, a second optical adhesive layer, and a third optical adhesive layer stacked together. The second optical adhesive layer is located between the first optical adhesive layer and the third optical adhesive layer. The second optical adhesive layer includes scattering particles. The first optical adhesive layer is provided on a surface of the second optical adhesive layer that is closer to the display panel. The third optical adhesive layer is provided on a surface of the second optical adhesive layer that is closer to the transmissive layer.

[0030] In this implementation, the optical adhesive layer is a sandwich structure. The second optical adhesive layer can have the function of enhancing scattering, and the first optical adhesive layer and the third optical adhesive layer can maintain the original function of the optical adhesive layer to prevent scattering particles from affecting the adhesive effect of the optical adhesive layer.

[0031] In another example, the intermediate layer can include a touch layer, which can not only generate touch signals but also scatter display light.

[0032] In another possible implementation, the display panel includes an intermediate layer. The intermediate layer is disposed near the transmissive layer. The intermediate layer is configured to scatter the display light. For example, the intermediate layer may include a polarizing layer of the display panel.

[0033] In this embodiment of the present application, the haze of the intermediate layer is an arbitrary value of [5%, 40%]. In other words, the haze of the intermediate layer may be 5%, or 40%, or any value greater than 5% and less than 40%. If the haze of the intermediate layer is small, it is insufficient to significantly suppress flash points. If the haze of the intermediate layer is large, the definition of the display screen is affected. In this embodiment of the present application, the haze of the intermediate layer is set to an arbitrary value of [5%, 40%] to suppress flash points and maintain the definition of the display screen.

[0034] In this embodiment of the present application, the haze of the intermediate layer may alternatively be any value of [40%, 95%]. In other words, the haze of the intermediate layer may be 40% or 95%, or any value greater than 40% and less than 95%. According to the solution, flash points can be suppressed while maintaining the definition of the display screen.

[0035] For example, the intermediate layer may include scattering particles, which may adjust the haze of the intermediate layer. For example, the scattering ability (haze) of the intermediate layer may be adjusted by varying several factors, such as the concentration of the scattering particles, the refractive index of the scattering particles, and the size of the scattering particles.

[0036] In general, the refractive index of the scattering particles may be any value in the range [1.4, 2.5]. In other words, the refractive index of the scattering particles may be 1.4, or 2.5, or any value greater than 1.4 and less than 2.5.

[0037] In order to further suppress flash points, in a possible implementation, the area of ​​the orthogonal projection image of the scattering particles along the thickness direction is equal to or less than the area of ​​the orthogonal projection image of the microstructure unit along the thickness direction. In this case, the scattering particles of the intermediate layer, like the microstructure unit, only bend the light rays generated by one subpixel, and the light rays bent by the scattering particles are incident on the corresponding microstructure unit. Therefore, different microstructure units may receive similar incident light rays. This further helps to suppress flash points.

[0038] In the display screen provided in this embodiment of the present application, the transmissive layer has multiple possible implementations. For example, the transmissive layer may include a cover plate, and the surface of the cover plate that is away from the display panel may be used as the first surface of the transmissive layer. In another example, the transmissive layer may not only include a cover plate, but also include a coating film. The cover plate is provided between the display panel and the coating film. One surface of the coating film is fixed to the cover plate, and the other surface of the coating film is the first surface of the transmissive layer. For example, the coating film may be an anti-reflective coating film.

[0039] According to a second aspect, an embodiment of the present application further provides a display screen protection film. The display screen protection film may be laminated on the light-emitting surface of the display screen by pasting or vacuum adsorption. The display screen protection film includes a rough surface. The rough surface may include a plurality of microstructure units. The orthogonal projection image of the microstructure unit along the thickness direction is located in the pixel area, and the projected area of ​​the microstructure unit is equal to or less than the area of ​​the pixel area. The microstructure unit is a curved surface. In this embodiment of the present application, the pixel area includes an area where the subpixel is located on the display screen, and a separation area between the subpixel and another subpixel located around the subpixel and adjacent to the subpixel.

[0040] The display screen protection film provided in this embodiment of the present application can enable a non-paper-like display screen to realize a paper-like display, and can further suppress flash points. The rough surface of the display screen protection film provided in this embodiment of the present application has a topographical feature similar to that of the first surface of the transparent layer in the first aspect. Details will not be described again. For the technical effects of the corresponding solution in the second aspect, please refer to the technical effects that can be obtained using the corresponding solution in the first aspect. Details will not be described here.

[0041] To further suppress flash points, in a possible implementation, the orthogonal projection images of at least two of the microstructure units are located within a sub-region of the pixel region, which may include a region with a sub-pixel between the sub-pixel and any adjacent sub-pixels.

[0042] In general, the height of each microstructure unit is an arbitrary value in the range [0.5 μm, 1.5 μm]. The height of each microstructure unit is the distance between the apex and the valley bottom of the microstructure unit. Specifically, the apex of the microstructure unit is the point within the microstructure unit that is the maximum distance from the display screen. The valley bottom of the microstructure unit is the point within the microstructure unit that is the minimum distance from the display screen.

[0043] Furthermore, the height of each microstructure unit may be any value in the range of [1.5 μm, 4 μm]. Specifically, the height of each microstructure unit may be 1.5 μm, or 4 μm, or any value greater than 1.5 μm and less than 4 μm.

[0044] In order to improve the paper-like display effect, in a possible implementation, the arithmetic mean height Ra of the multiple microstructure units on the rough surface in any length parallel to any direction of the display screen is an arbitrary value of [0.1 μm, 1 μm]. The arithmetic mean height Ra represents the arithmetic mean value of the absolute value of the vertical distance between the tangential contour line of the multiple microstructure units and the center line within any length range on the vertical tangential plane along any direction and thickness direction. The center line is a straight line on the vertical tangential plane parallel to any direction, and the sum of the areas of the multiple regions formed by the tangential contour line and center line of the multiple microstructure units is equal to the sum of the areas of the multiple regions formed by the tangential contour line and center line of every two adjacent microstructure units.

[0045] Furthermore, the arithmetic mean height Ra of the multiple microstructure units may alternatively be any value in the range [0.2 μm, 0.5 μm]. Specifically, the arithmetic mean height Ra may be 0.2 μm, or 0.5 μm, or any value greater than 0.2 μm and less than 0.5 μm.

[0046] In order to improve the paper-like display effect, a possible implementation is that the density of the microstructure units is 5000 / mm on the rough surface. 2 That's all.

[0047] In order to further suppress flash points, the ratio Ra / Rsm of the arithmetic mean height Ra of the microstructure units to the average length Rsm of the contour curve elements of the microstructure units on the rough surface within any length range parallel to any direction of the display screen is 0.5% or more. The meaning of the arithmetic mean height Ra will not be explained again. The average length Rsm of the contour curve elements represents the average value of the projected length on the center line of the connecting lines between the vertices of the tangent contours of every two adjacent microstructure units in the tangent contours of the microstructure units within any length range on the vertical tangent plane along any direction and the thickness direction. The vertex of the tangent contour is the point in the tangent contour that is the furthest from the display screen.

[0048] In a possible implementation, the display screen protection film is an anti-reflective coating to help suppress the interference of ambient light on the contrast of the displayed picture and to eliminate the "picture bleaching" problem caused by diffuse reflection.

[0049] According to a third aspect, an embodiment of the present application provides an electronic device. The electronic device includes a display screen provided in any one of the first aspects. For example, the electronic device may be a general mobile terminal such as a mobile phone, a tablet computer, or an e-book reader, or may be an electronic device such as a notebook computer, a desktop computer, or a television.

[0050] According to a fourth aspect, an embodiment of the present application provides an electronic device, including a display screen and a display screen protection film provided in the second aspect. The display screen protection film is fixed to the light-emitting surface of the display screen, and the rough surface of the display screen protection film is provided away from the display screen. The display screen may be a conventional non-paper-like display screen. By using the display screen protection film provided in this embodiment of the present application, the display screen of the electronic device can also achieve a paper-like display, and the flash point of the display screen can be further suppressed.

[0051] These and other aspects of the present application will become clearer and more easily understood in the following description of the embodiments. [Brief description of the drawings]

[0052] [Figure 1] FIG. 2 is a schematic diagram of a cross-sectional side structure of a transmission type display screen. [Diagram 2] 1 is a schematic diagram of the structure of an LCD panel. [Diagram 3] FIG. 2 is a schematic diagram of the structure of a pixel array. [Figure 4] FIG. 2 is a schematic diagram of the structure of an LED display panel. [Diagram 5] 1 is a schematic diagram of the structure of an OLED display panel. [Figure 6a]FIG. 2 is a schematic diagram of the luminance distribution in a monochrome display picture when the first surface of the transmissive layer is a smooth surface. [Figure 6b] FIG. 2 is a schematic diagram of the luminance distribution in a monochrome display picture when the first surface of the transmissive layer is rough. [Figure 6c] 1 is a schematic diagram of a chromaticity distribution in a monochrome display picture when the first surface of the transmissive layer is a smooth surface. [Figure 6d] FIG. 2 is a schematic diagram of chromaticity distribution in a monochrome display picture when the first surface of the transmissive layer is rough. [Figure 7] FIG. 2 is a schematic diagram of a structure of a display screen according to an embodiment of the present application; [Figure 8] FIG. 2 is a top view of a first surface along the thickness direction according to an embodiment of the present application. [Figure 9] FIG. 2 is a schematic diagram of the correlation between speckle area and maximum size of a microstructure unit according to an embodiment of the present application. [Figure 10] FIG. 2 is a schematic diagram of a longitudinal tangential plane of a transmission layer according to an embodiment of the present application. [Figure 11] FIG. 2 is a schematic diagram of a particular structure of a display screen according to an embodiment of the present application; [Figure 12] FIG. 2 is a schematic diagram of a particular structure of a display screen according to an embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0053] In order to make the objectives, technical solutions and advantages of the present application clearer, the following will further describe the present application in detail with reference to the accompanying drawings. Please note that the terms used in the following embodiments are only for describing certain embodiments and are not intended to limit the present application. When used in this specification and the appended claims of this application, the singular expressions "one", "a", "the", "the foregoing", "this", and "the one" are also intended to include expressions such as "one or more", unless the context clearly indicates the contrary.

[0054] References to "one embodiment," "some embodiments," and the like described in the embodiments of this application mean that one or more embodiments of this application include the particular feature, structure, or characteristic described with reference to the embodiment. Thus, statements such as "in one embodiment," "some embodiments," "some other embodiments," and "other embodiments" appearing in various places in the embodiments of this application are not necessarily meant to refer to the same embodiment. Instead, these statements mean "one or more, but not all, embodiments," unless specifically emphasized otherwise. The terms "comprising," "including," "having," and other variations thereof all mean "including, but not limited to," unless specifically emphasized otherwise.

[0055] In order to improve the paper-like display effect of the transmissive display screen, an embodiment of the present application provides a display screen to reduce the influence of the flash point of the display screen on the display effect and realize paper-like display. It should be noted that the display screen provided in this embodiment of the present application may be applied to any electronic device with a display function, for example, may be used as the display screen of a general mobile terminal such as a mobile phone, a tablet computer, or an e-book reader, or may be used as the display screen of an electronic device such as a notebook computer, a desktop computer, or a television.

[0056] The display screen provided in this embodiment of the present application may be a transmissive display screen. "Transmissive" may be understood as the display screen can generate display light beams inside and emit the display light beams from the light-emitting surface of the display screen. For example, FIG. 1 is a schematic diagram of the structure of a side cross section of a transmissive display screen. From FIG. 1, it can be seen that the display screen 100 can include a display panel 101 and a transmissive layer 102, and the transmissive layer 102 and the display panel 101 are stacked. One surface of the transmissive layer 102 is provided near the light-emitting surface of the display panel 101, and the other surface of the transmissive layer 102 away from the display panel 101 can be used as the light-emitting surface of the display screen 100. The display panel 101 can emit a display light beam, and the display light beam may be transmitted through the transmissive layer 102 to realize a transmissive display.

[0057] In the following, the display panel 101 and the transmissive layer 102 will be further described with the aid of an example.

[0058] 1. Display panel 101 According to different light-emitting principles, there are several types of display panels 101, and common display panels mainly include liquid crystal display (LCD) panels, light-emitting diode (LED) display panels, organic light-emitting diode (OLED) display panels, etc.

[0059] In general, the display panel 101 may include a light-emitting structure, which can generate light when the display panel 101 operates. In addition to the light-emitting structure, the display panel 101 may further include another functional layer based on different types of display panels 101. These functional layers are combined with the light-emitting structure so that the display panel 101 can generate display light to realize the display function. The display light can be understood as the light generated by the display panel 101 and used to present a display picture. After the display light is received by the human eye, the user can observe the display picture.

[0060] An LCD panel is used as an example. The structure of the LCD panel is shown in Figure 2, and mainly includes a backlight module (BLU) 201, a lower polarizing layer 202, a glass substrate 203, a liquid crystal molecular layer 204, a color photoresist layer 205, a glass substrate 206, and an upper polarizing layer 207, which are stacked in sequence. The backlight module 201 is the light-emitting structure of the LCD panel, and is configured to generate a light beam of unpolarized light. The lower polarizing layer 202 can convert the unpolarized light generated by the backlight module 201 into linearly polarized light.

[0061] The glass substrate 203 and the glass substrate 206 are configured to encase the liquid crystal molecular layer 204 and the color photoresist layer 205. The arrangement manner of the liquid crystal molecules in the liquid crystal molecular layer 204 is controllable, and the polarization direction of light can be changed by changing the arrangement manner of the liquid crystal molecules.

[0062] The color photoresist layer 205 includes photoresist arranged in an array, which can also be understood as a pixel array of an LCD panel. For example, in FIG. 3, the pixel array includes a plurality of pixels arranged in an array, and each pixel includes three sub-pixels (photoresist) corresponding to three colors, red, green, and blue, respectively.

[0063] The lower polarizing layer 202 and the upper polarizing layer 207 are arranged perpendicular to each other, and the linearly polarized light transmitted through the lower polarizing layer 202 cannot directly transmit through the upper polarizing layer 207. Therefore, the polarization state of the light beam incident on each sub-pixel may be adjusted using the liquid crystal molecular layer 204 to control the transmission intensity of the light beam originating from each sub-pixel and transmitted from the upper polarizing layer 207.

[0064] For example, for pixels that do not need to emit light, the liquid crystal molecular layer 204 may maintain unchanged the polarization state of the light beam incident on the subpixel, i.e., the polarization state of the light beam transmitted through the lower polarizing layer 202. Thus, the light beam transmitted from a pixel that does not need to emit light cannot continue to be transmitted through the upper polarizing layer 207, i.e., the subpixel cannot emit light.

[0065] However, for those sub-pixels that need to emit light, the liquid crystal molecular layer 204 may adjust the polarization state (adjust the polarization angle) of the light beam incident on the sub-pixel. For the light beams transmitted from the sub-pixels that need to emit light, light beams of different polarization angles may be transmitted from the upper polarizing layer 207 with different intensities. Thus, the emission intensity of the sub-pixels can be controlled by adjusting the polarization state of the light beam incident on the sub-pixels.

[0066] An LED display panel is used as an example. As shown in FIG. 4, the LED display panel mainly includes a substrate 401, a light-emitting layer 402, and an encapsulation layer 403, which are stacked in sequence. The substrate 401 can support the light-emitting layer 402. The light-emitting layer 402 is the light-emitting structure of the LED display panel and includes a pixel array. The arrangement method of the pixel array in the LED display panel is similar to that of the LCD panel, and can also be shown in FIG. 4. The difference is that the pixel array of the LED display panel includes LEDs corresponding to three colors, red, green, and blue, and the pixel array of the LED display panel itself can be electrically emitting (or photoinduced). The encapsulation layer 403 covers the light-emitting layer 402 to protect the internal structure of the LED display panel.

[0067] The structure of the OLED display panel is similar to that of the LED display panel. As shown in FIG. 5, the OLED display panel mainly includes a substrate 501, an emitting layer 502, an encapsulation layer 503, and a polarizing layer 504. For the functions of the substrate 501, the emitting layer 502, and the encapsulation layer 503, please refer to the LED display panel. The difference is that the emitting layer 402 of the LED display panel includes an LED display panel to form a pixel array, and the emitting layer 502 of the OLED display panel includes an OLED to form a pixel array. Other similarities will not be described again. In addition, the OLED display panel may further include a polarizing layer 504. The polarizing layer 504 can reduce the reflection intensity of the OLED display panel to the external ambient light.

[0068] 2.Transparent layer 102 1, the transmissive layer 102 is disposed near the light-exit surface of the display panel 101, and a first surface of the transmissive layer 102 remote from the display panel 101 is rough. The first surface of the transmissive layer 102 may also be understood as the light-exit surface of the transmissive layer 102, i.e. the surface through which light rays are transmitted by the transmissive layer 102, or as the light-exit surface of the display screen 100, i.e. the surface from which light rays are emitted by the display screen 100.

[0069] The first surface of the transmissive layer 102 is a rough surface. Therefore, to achieve a paper-like display effect, the ambient light irradiated on the first surface can be diffusely reflected. In particular, in general paper reading, the paper can reflect the ambient light with near-Lambertian (a type of diffuse reflection). Lambertian reflection means that when a light ray is incident on the reflecting surface, the intensity of the reflected light ray in all directions within the hemispherical space of the reflecting surface, centered on the incident point, is the same. In paper reading, when the ambient light irradiates the paper, the intensity of the reflected light ray of the ambient light in all directions within the hemispherical space on the paper is the same or similar. Therefore, near-Lambertian, that is, diffuse reflection similar to Lambertian reflection, can be achieved.

[0070] In order to achieve the same or similar display effect as reading paper, the first surface of the transmissive layer 102 of the paper-like display screen 100 is usually made rough so that the first surface can also perform diffuse reflection to the ambient light. As shown in Fig. 1, the first surface of the transmissive layer 102 includes a number of microstructure units, and each microstructure unit is a curved surface. When the ambient light shines on the first surface, different microstructure units can reflect the ambient light in different directions to perform diffuse reflection of the ambient light.

[0071] However, when reflecting the ambient light, the microstructure units on the first surface generate different refraction degrees for the light rays of different sub-pixels. Thus, flash points occur on the display screen 100. For example, FIG. 6a is a schematic diagram of the luminance distribution in a monochromatic display picture within an area of ​​8 mm×8 mm when the first surface of the transmissive layer 102 is a smooth surface. The monochromatic display picture may be any one of red, green, and blue display pictures. X is any direction parallel to the display panel 101, and Y is a direction perpendicular to X. From FIG. 6a, it can be seen that the display image includes pixel points arranged in an array, and each pixel point corresponds to an intersection line generated by one pixel on the display panel. When the first surface of the transmissive layer 102 is a smooth surface, the luminance of the display picture is uniformly distributed, and the luminance of different pixel points is the same or similar.

[0072] Figure 6b is a schematic diagram of the luminance distribution in a monochrome display picture within an area of ​​8 mm x 8 mm when the first surface of the transmissive layer 102 is rough. By comparing Figure 6a and Figure 6b, it can be seen that when the first surface of the transmissive layer 102 is rough, areas with non-uniform luminance appear on the display picture, and some of the pixel points have low luminance. These areas can also be called speckles. In other words, the microstructure units on the first surface cause the non-uniform luminance of the display picture.

[0073] 6c is a schematic diagram of the chromaticity distribution in a monochrome display picture within an area of ​​8 mm×8 mm when the first surface of the transmissive layer 102 is a smooth surface. From FIG. 6c, it can be seen that when the first surface of the transmissive layer 102 is a smooth surface, the chromaticity distribution of the display picture is uniform, and the chromaticities of different pixel points are the same or similar.

[0074] Figure 6d is a schematic diagram of the chromaticity distribution in a monochrome display picture within an area of ​​8 mm x 8 mm when the first surface of the transmissive layer 102 is rough. By comparing Figure 6c and Figure 6d, it can be seen that when the first surface of the transmissive layer 102 is rough, the chromaticity of the display picture is non-uniform, and the chromaticity of some of the pixel points is low. In other words, the micro-structure units on the first surface cause the non-uniform chromaticity of the display picture.

[0075] The uneven brightness and chromaticity reduction of the display picture shown in Figure 6b and Figure 6d can also be called flash points. When the first surface is rough, the light refraction reduction occurs mainly when the light ray generated by any sub-pixel passes through the micro-structure unit, so that the flash points appear on the display picture. When the micro-structure unit refracts the light ray generated by multiple sub-pixels (same color or different colors), the relative positions of the micro-structure unit and the multiple sub-pixels are not consistent, so that the micro-structure unit refracts the light rays of different sub-pixels to different degrees. As a result, the ratio of the three primary colors of each pixel point is shifted and reflected by the display picture, that is, the chromaticity and brightness of the display picture are uneven, and the flash points appear on the display picture.

[0076] For example, in Figure 1, microstructure unit A has a different relative position to the blue and green subpixels of pixel 1, so that microstructure unit A refracts the light generated by the green subpixel a little, and microstructure unit A refracts the light generated by the blue subpixel a lot. As a result, the ratio of blue light intensity to green light intensity in pixel 1 is shifted. When this ratio deviation is common to the transmitted light of the first surface, a flash point is generated.

[0077] In view of this, in the display screen provided in this embodiment of the present application, the first surface of the transmissive layer 102 is further improved. For example, FIG. 7 is a side cross-sectional view of a display screen along the thickness direction according to an embodiment of the present application. As shown in FIG. 7, the first surface of the transmissive layer 102 provided in this embodiment of the present application includes a plurality of microstructure units, and these microstructure units are curved surfaces. The orthogonal projection images of the microstructure units along the thickness direction are located within the pixel region, and the projection area of ​​the microstructure units is equal to or less than the area of ​​the pixel region.

[0078] Specifically, the thickness direction of the display screen 100 may be indicated by an arrow in FIG. 7, or may be understood as a direction pointing perpendicularly from the transmissive layer 102 to the display panel 101. It may be understood that the top view shape of the microstructure unit in the top view along the thickness direction is the same as the shape of the orthogonal projection image of the microstructure unit along the thickness direction. For example, FIG. 8 shows an example of a top view of the first surface along the thickness direction. As shown in FIG. 8, the enclosed area formed by the white line represents the microstructure unit. In the top view, the top view shape of the microstructure unit may be a regular shape or an irregular shape. The top view shapes of different microstructure units may be the same or different. The microstructure units may be distributed regularly or irregularly on the first surface. This is not limited in this embodiment of the application.

[0079] In this embodiment of the present application, the pixel area not only includes the area where the subpixel is located on the display panel, but also includes the spacing area between the subpixel and another subpixel located around the subpixel adjacent to the subpixel. Subpixel A in FIG. 3 is used as an example. There are eight adjacent subpixels around the subpixel A. In this case, the pixel area including the area where the subpixel A is located and the spacing area between the subpixel A and the eight adjacent subpixels around the subpixel A can be shown in FIG. 3.

[0080] The orthogonal projection image of the single microstructure unit is located within the pixel region, and the projection area of ​​the single microstructure unit is equal to or smaller than the area of ​​the pixel region. In other words, the orthogonal projection image of the single microstructure unit covers only a part or all of the area where at most one subpixel is located.

[0081] As shown in Fig. 7, in the pixel region where the blue subpixel is located, the orthogonal projection images of the two microstructure units are located in the pixel region where the blue subpixel is located. Therefore, the two microstructure units mainly bend the light beam generated by the blue subpixel, and do not bend or only slightly bend the light beam generated by the green subpixel or the red subpixel adjacent to the blue subpixel. Similarly, the microstructure unit whose orthogonal projection image is located in the pixel region of the red subpixel mainly bends the light beam generated by the red subpixel, and the microstructure unit whose orthogonal projection image is located in the pixel region of the green subpixel mainly bends the light beam generated by the green subpixel.

[0082] By using this structure, it can be avoided to some extent that a single microstructure unit bends the light beams generated by different sub-pixels. Specifically, since the orthogonal projection image of a single microstructure unit covers only a part or all of the area where at most one sub-pixel is located, the microstructure unit mainly bends the light beams generated by the sub-pixels. Based on the analysis of the first surface as shown in FIG. 1, since the microstructure unit bends the light beams of different sub-pixels differently, the intensity ratio of the three primary colors in the pixel is shifted, and thus a flash point is generated. However, on the first surface as shown in FIG. 7, each microstructure unit mainly bends the light beams of one color. This helps to reduce the difference in the light refraction degree between different sub-pixels, which further helps to optimize the flash point.

[0083] It should be noted that there may be overlapping regions between adjacent pixel regions, i.e., spacing regions between adjacent sub-pixels. Although the microstructure unit with orthogonal projection image located in the overlapping region can bend the light rays of all adjacent sub-pixels, the microstructure unit bends the light rays of adjacent sub-pixels to a similar extent, since the positions of adjacent sub-pixels relative to the microstructure unit are approximately symmetrical. In addition, the area of ​​the overlapping region between pixel regions is much smaller than the area of ​​the region where the sub-pixels are located. Therefore, the microstructure unit with orthogonal projection image located in the overlapping region does not have a significant effect on the light intensity ratio between adjacent sub-pixels.

[0084] To further suppress flash points, in a possible implementation, the orthogonal projection images of at least two of the microstructure units are located within a sub-region of the pixel region, including a region where there is a sub-pixel between the sub-pixel and any adjacent sub-pixels.

[0085] The pixel array shown in Fig. 3 is used as an example. The sub-region of the pixel region where sub-pixel A is located includes the region where sub-pixel A is located and the spacing region between sub-pixel A and any adjacent pixel (e.g. pixel B). The orthogonal projection image of at least two microstructure units located in the sub-region may also be understood to be a maximum size of the microstructure units that is less than or equal to 1 / 2 of the pixel pitch.

[0086] The size of the microstructure unit can be understood as the maximum value of the linear distance between two points on the edge of the top view shape of the microstructure unit along the thickness direction. For example, the size of any microstructure unit can be shown in FIG. 8. It should be understood that the sizes of different microstructure units can be the same or different. In this embodiment of the present application, the maximum size of the microstructure unit is the maximum value that can be reached by the size of each microstructure unit on the first surface, i.e., the size of each microstructure unit is less than or equal to the maximum size.

[0087] Pixel pitch can be understood as the minimum repeat distance of a sub-pixel in a pixel array. The repeat distance is the sum of the size of the sub-pixel in a direction parallel to the pixel array and the separation distance between the sub-pixel and any adjacent sub-pixel in that direction. In general, for the same pixel array, the repeat distance changes with changes in direction.

[0088] In general, the minimum value of the repetition distance, i.e., the minimum repetition distance, can be used as the pixel pitch. For example, in FIG. 3, if the repetition distance in the y direction indicated by the arrow is the minimum repetition distance, the pixel pitch may be shown in FIG. 3 as being the sum of the size of the sub-pixel P1 in the y direction and the separation distance between the sub-pixel P1 and the sub-pixel P2.

[0089] It has been found through research that the speckle area of ​​the display picture and the maximum size of the microstructure unit satisfy the relationship shown in Figure 9. In Figure 9, the horizontal coordinate represents the maximum size of the microstructure unit, and the vertical coordinate represents the speckle area in the display picture. Figure 9 shows the display pictures of the red sub-pixel (R), the green sub-pixel (G), and the blue sub-pixel (B), as well as the average display effect (ave) of the three sub-pixels, respectively.

[0090] From FIG. 9, it can be seen that when the maximum size of the microstructure unit is less than or equal to 1 / 2 of the pixel pitch, the display picture of the red subpixel (R), green subpixel (G) and blue subpixel (B) as well as the average display effect (ave) of the three subpixels all maintain a low speckle area. When the maximum size of the microstructure unit exceeds 1 / 2 of the pixel pitch, the speckle area increases rapidly with the increase in the maximum size of the microstructure unit. When the maximum size of the microstructure unit exceeds the pixel pitch, although the speckle area in the display picture of the red subpixel (R) decreases with the increase in the maximum size of the microstructure unit, the overall display effect cannot be improved. That is, the average display effect (ave) still maintains a large value.

[0091] In view of this, in the display screen provided in this embodiment of the present application, the orthogonal projection images of at least two microstructure units are located within a sub-area of ​​the pixel area. In other words, the maximum size of the microstructure unit is less than or equal to 1 / 2 of the pixel pitch. This is helpful to control the speckle area within a small range and optimize the flash point.

[0092] To further suppress flash points on the display screen 100, in a possible implementation, within any length range on the first surface parallel to any direction of the display panel 101, the ratio Ra / Rsm of the arithmetic mean height Ra of the multiple microstructure units to the average length Rsm of the contour curve elements of the multiple microstructure units is 0.5% or greater.

[0093] The arithmetic mean height Ra represents the arithmetic mean value of the absolute values ​​of the perpendicular distances between the tangential contour lines of multiple microstructural units and the center lines within any length range (e.g., L) on the vertical tangential plane along any direction and thickness direction.

[0094] The center line is a straight line on the vertical tangent plane parallel to any direction, and the sum of the areas of the regions formed by the tangent contours and center lines of the multiple microstructural units is equal to the sum of the areas of the regions formed by the tangent contours and center lines of every two adjacent microstructural units.

[0095] For example, along the s direction in Fig. 8 and the thickness direction in Fig. 7, the vertical tangential plane of the transmission layer 102 at length L in the s direction can be shown in Fig. 10. There are a total of three microstructure units in the length L. The centerline and the tangential plane contours of the three microstructure units form a number of regions (region S1 to region S6).

[0096] Regions S1 to S3 are regions formed by the tangent contours and centerlines of the three microstructural units. Region S4 is a region formed by the tangent contour of the first microstructural unit, the tangent contour of the second microstructural unit, and the centerline. Region S5 is a region formed by the tangent contour of the second microstructural unit, the tangent contour of the third microstructural unit, and the centerline. Region S6 is a region formed by the tangent contour of the third microstructural unit, the tangent contour of the microstructural unit adjacent to the third microstructural unit, and the centerline. In addition, the sum of the areas of regions S1 to S3 is equal to the sum of the areas of regions S4 to S6.

[0097] The arithmetic mean height Ra represents the arithmetic mean value of the absolute values ​​of the vertical distances between the tangential contour lines and the center lines of the three microstructure units in FIG. 10, and can reflect the average height of the three microstructure units. The height of each microstructure unit can be understood as the distance between the apex and the valley bottom of the microstructure unit. Specifically, the apex of the microstructure unit may be a point within the microstructure unit that is at the maximum vertical distance from the display panel 101. The valley bottom of the microstructure unit can be understood as a point within the microstructure unit that is at the minimum vertical distance from the display panel 101.

[0098] The average length Rsm of the contour curve element represents the average value of the projected length on the center line of the connecting lines between the vertices of the tangent contours of every two adjacent microstructure units in the tangent contours of multiple microstructure units within any length range (e.g., length L) on the vertical tangent plane along any direction and thickness direction. The vertex of the tangent contour can be understood as the point within the tangent contour that is at the maximum vertical distance from the display panel 101.

[0099] For example, in FIG. 10, the projected length of the connecting line between the vertex of the first microstructure unit and the vertex of the second microstructure unit on the center line is a1, and the projected length of the connecting line between the vertex of the second microstructure unit and the vertex of the third microstructure unit on the center line is a2. In this case, the average length Rsm of the contour curve element can be obtained through calculation based on the average value of a1 and a2. The average length Rsm of the contour curve element can represent the width state of multiple microstructure units.

[0100] It has been found through research that a larger Ra / Rsm value helps to suppress flash points more. Therefore, in this embodiment of the present application, the value of Ra / Rsm is 0.5% or more to further suppress flash points.

[0101] In conclusion, using the first surface provided in this embodiment of the present application helps to suppress the flash points of the display panel 101 and realize a paper-like display. For example, to achieve a paper-like display effect, the first surface in this embodiment of the present application can meet at least one of the following conditions:

[0102] Condition 1: Within any length range in any direction on the first surface, the arithmetic mean height Ra of the multiple microstructure units may be any value between [0.1 μm, 1 μm].

[0103] The specific definition of the arithmetic mean height Ra will not be described again. Specifically, the arithmetic mean height Ra may be 0.1 μm, or 1 μm, or any value greater than 0.1 μm and less than 1 μm.

[0104] Furthermore, the arithmetic mean height Ra of the multiple microstructure units may alternatively be any value in the range of [0.2 μm, 0.5 μm]. Specifically, the arithmetic mean height Ra may be 0.2 μm, or 0.5 μm, or any value greater than 0.2 μm and less than 0.5 μm. For example, the arithmetic mean height Ra of the microstructure units may be any value, such as 0.2 μm, 0.25 μm, 0.3 μm, 0.34 μm, 0.4 μm, or 0.5 μm.

[0105] If the arithmetic mean height Ra is too small, specular reflection will occur, which is not conducive to realizing the paper-like display effect. If the arithmetic mean height Ra is too large, the definition of the display screen 100 will be reduced, and the display contrast will also be reduced in ambient light. Therefore, in this embodiment of the present application, the arithmetic mean height Ra may be any value in [0.1 μm, 1 μm], which is conducive to maintaining the definition of the display screen 100 and realizing the paper-like display.

[0106] In a possible implementation, the height of a single microstructure unit may be any value in the range [0.5 μm, 1.5 μm]. That is, the height of the microstructure unit may be 0.5 μm, or 1.5 μm, or any value greater than 0.5 μm and less than 1.5 μm. For example, the height of the microstructure unit may be any value, such as 0.5 μm, 0.8 μm, 1 μm, 1.2 μm, or 1.5 μm.

[0107] Furthermore, the height of each microstructure unit on the first surface may alternatively be any value in the range of [1.5 μm, 4 μm]. Specifically, the height of each microstructure unit may be 1.5 μm, or 4 μm, or any value greater than 1.5 μm and less than 4 μm. For example, the height of the microstructure unit may be any value, such as 1.5 μm, 1.8 μm, 2 μm, 2.5 μm, 2.7 μm, 3 μm, 3.4 μm, 3.5 μm, 3.8 μm, or 4 μm.

[0108] Condition 2: On the first surface, the density of the microstructure units is 5000 / mm2 That's all.

[0109] Specifically, any 1 mm 2 Within the plane range of 100 mm, there are at least 5000 microstructure units. It can be understood that if the density of the microstructure units on the first surface is too small, specular reflection will also occur on the first surface, which is not conducive to realizing the paper-like display effect. In view of this, in this embodiment of the present application, the density of the microstructure units on the first surface is set to 5000 / mm to prevent specular reflection from occurring on the first surface. 2 That's it. This helps to achieve a paper-like display effect.

[0110] Condition 3: Within a deviation of 1° from the reflection angle, the attenuation of the reflected light from the first surface is less than 5%.

[0111] Specifically, when the ambient light is irradiated onto the first surface and reflected by the first surface, the intensity of the reflected light is attenuated by less than 5% within a deviation range of 1° from the reflection angle. If the intensity of the reflected light is significantly attenuated within a deviation range of 1° from the reflection angle, it can be understood that this indicates that the intensity of the reflected light is mostly concentrated within a deviation range of 1° from the reflection angle. In other words, the reflection of the first surface to the ambient light tends to be specular rather than diffuse.

[0112] Correspondingly, in this embodiment of the present application, the attenuation of the reflected light of the first surface is less than 5% within a deviation of 1° from the reflection angle, and the modulation transfer function (MTF) of the reflected image is less than 0.017. 2In the medium luminance range, the relationship between the minimum visually perceptible difference luminance of the human eye and the background luminance follows Weber's law, and it has been found through research that the ratio between the two is approximately equal to 0.017. That is, when the modulation transfer function of the reflected image is 0.017 or more, the human eye can recognize the reflected image. In this application, the attenuation of the reflected light of the first surface is less than 5% within a deviation of 1° from the reflection angle, so that the modulation transfer function MTF of the reflected image is less than 0.17 and the user cannot recognize the specular reflection. This facilitates paper-like display.

[0113] Furthermore, in this embodiment of the present application, within a deviation of 1° from the reflection angle, the attenuation of the reflected light of the first surface is an arbitrary value of [5%, 10%]. This also helps to suppress flash points, and the user cannot recognize the specular reflection. This facilitates a paper-like display.

[0114] In this embodiment of the present application, the specific structure of the transmissive layer 102 has multiple possible implementations. For example, as shown in FIG. 11, the transmissive layer 102 can include a cover plate 1021. The cover plate 1021 can be a glass cover plate, or a flexible cover plate (polymer film material). This is not limited in this embodiment of the present application. One side of the cover plate 1021 is fixed to the display panel 101, and the other side of the cover plate 1021 can be used as the first surface of the transmissive layer 102. The light exit surface of the cover plate 1021 can be used as the first surface of the transmissive layer 102.

[0115] For example, the microstructure units can be fabricated on the surface of the cover plate 1021 in at least one of the following ways:

[0116] Method 1: Chemical Etching. Specifically, the cover plate 1021 is etched through chemical frosting, and the size of the microstructure unit can be controlled to 3-20 μm (pixel pitch is 40 μm or more) by adjusting the ratio of glass frost powders NH4F and NaF. That is, the size of the microstructure unit can be 3 μm, or 20 μm, or any value greater than 3 μm and less than 20 μm. By adjusting the etching time and HF concentration, the variation range of the arithmetic mean height Ra is controlled to 0.01-1.0 μm. In addition, the initial Ra / Rsm for making the first surface is in the range of 0.5% to 2%. That is, the initial Ra / Rsm can be 0.5%, or 2%, or any value greater than 0.5% and less than 2%.

[0117] After etching, the first surface is polished, and the Ra / Rsm is further corrected by further adjusting the polishing time and the ratio of strong acid (H2SO4) in the polishing solution to HF mass score to control the Ra / Rsm within the range of 1.8% or less, prevent an excessively large Ra / Rsm value from affecting the definition of the display screen 100, and finally obtain a first surface that meets the requirements of paper-like display and flash point suppression.

[0118] Method 2: physical sandblasting. Specifically, the size of the microstructure unit may be controlled to be between 3μm and 20μm (pixel pitch is 40μm or more) by controlling the size of sandblasting / shot blasting, and Ra and Ra / Rsm are controlled to reach a suitable range by controlling the hardness of sandblasting / shot blasting and the pressure of compressed air, and then further topography correction is made by polishing to finally obtain the first surface which meets the requirements of paper-like display and flash point suppression.

[0119] Method 3: Spraying. Specifically, inorganic or organic polymer materials may be deposited on the surface of the cover plate 1021 away from the display panel 101 to form a non-flat surface structure. The surface topography correction is carried out by selecting different spraying materials and repeatedly coating to finally obtain a first surface that meets the requirements of paper-like display and flash point suppression.

[0120] Method 4: Exposure-development process. Specifically, the surface of the cover plate 1021, which is away from the display panel 101, may be coated with a photoresist adhesive. After baking and curing, photo-etching and development are performed using ultraviolet (ultraviolet, uv) light through a photomask with a specific pattern designed based on the desired topography. In a possible implementation, the developed photoresist adhesive is retained to realize the surface microstructure units of a specific topography. That is, the microstructure units on the first surface of the transparent layer 102 are formed using the retained developed photoresist adhesive. In another possible implementation, chemical etching may be performed on the surface of the developed cover plate 1021 by adding an etching process to form a first surface having microstructure units. That is, the microstructure units on the first surface are formed on the surface of the cover plate 1021.

[0121] In another possible implementation, the transmissive layer 102 can not only include a cover plate 1021, but also include a coating film 1022. One side of the coating film 1022 is fixed to the cover plate 1021. In this case, the other side of the coating film 1022 can be used as the first surface of the transmissive layer 102. For example, the coating film 1022 can be an anti-reflection coating film. For example, the reflectance of the coating film 1022 to ambient light is 1% or less. Providing the coating film 1022 helps to suppress the interference of ambient light to the contrast of the displayed picture, and eliminates the "picture bleaching" problem caused by diffuse reflection.

[0122] When the transmission layer 102 includes a cover plate 1021 and a coating film 1022, the microstructure unit can be fabricated on the surface of the cover plate 1021 to obtain a first surface that meets the requirements of paper-like appearance and flash point suppression. Alternatively, the microstructure unit can be fabricated on the surface of the coating film 1022 to obtain a first surface that meets the requirements of paper-like appearance and flash point suppression.

[0123] Specifically, in a possible implementation, after the microstructure units are fabricated on the surface of the cover plate 1021, the coating film 1022 is fabricated on the surface of the cover plate 1021. In general, the thickness of the coating film 1022 is thin, and its influence on the topography of the microstructure units can be neglected.

[0124] In another possible implementation, the coating film 1022 may alternatively be fabricated on a surface (smooth surface) of the cover plate 1021, and the microstructure units may be fabricated on a surface of the coating film 1022 that is remote from the cover plate 1021. For example, the microstructure units may be fabricated on the surface of the coating film 1022 by at least one of the following methods:

[0125] Method 1: The coating film 1022 is made by coating the surface of the cover plate 1021 with a polymer solution. Particles are added to the polymer solution. After the polymer solution is coated and cured, the particles in the polymer solution can protrude from the surface of the coating film 1022, so that microstructure units can be formed on the surface of the coating film 1022. The Ra and Rsm are controlled by adjusting the particle size, the thickness of the coating film, and the particle density in the solution. In a possible implementation, the refractive index of the particles may be further adjusted to adjust the haze of the first surface.

[0126] Method 2: Coat the surface of the cover plate 1021 with a coating substrate, and further coat the surface of the coating substrate with two insoluble resins. Under certain conditions, the two insoluble resins separate to form an uneven surface structure.

[0127] Method 3: Coat the surface of the cover plate 1021 with a coating substrate, perform nanoimprinting on the surface of the coating substrate, and design a specific embossing abrasive to achieve a first surface that meets the requirements of paper-like display and flash point suppression.

[0128] It should be understood that compared with fabricating microstructure units on the surface of the cover plate 1021, the application scenario of fabricating microstructure units on the surface of the coating film 1022 is more flexible, easier to replace, has lower reliability requirements, and has more options in the manufacturing process.

[0129] In order to further suppress the flash point of the display screen, in a possible implementation, the display screen may further include an intermediate layer. In a possible implementation, the intermediate layer may be located between the display panel 101 and the transmissive layer 102. In another possible implementation, the intermediate layer may alternatively be located inside the display panel 101, and the intermediate layer is provided near the transmissive layer 102. Details will be described below based on different cases.

[0130] Case 1: The intermediate layer is located between the display panel 101 and the transmissive layer 102 .

[0131] 12, the display screen 100 further includes an intermediate layer 103 located between the display panel 101 and the transmissive layer 102. The intermediate layer 103 can scatter the display light generated by the display panel 101 so as to further suppress flash points.

[0132] Specifically, it has been found through research that when the scattering degree of the display light is high, the flash point of the display screen 100 gradually decreases with the increase in the scattering degree of the display light. However, if the scattering ability of the first surface is improved too much, the definition of the display screen 100 decreases.

[0133] Considering this, in this embodiment of the present application, an intermediate layer 103 is provided between the display panel 101 and the transmissive layer 102. Based on the first surface, the intermediate layer 103 further improves the scattering degree of the display light so as to suppress the flash point of the display screen 100. In addition, compared with the first surface of the transmissive layer 102, the intermediate layer 103 may be provided at a position closer to the display panel 101. This helps to reduce the impact on the definition of the display screen 100.

[0134] For example, the haze of the intermediate layer 103 may be any value of [5%, 40%]. Specifically, the haze of the intermediate layer may be 5% or 40%, or may be any value greater than 5% and less than 40%. If the haze of the intermediate layer 103 is small, it is insufficient to significantly suppress flash points. If the haze of the intermediate layer 103 is large, the definition of the display screen 100 is affected. In this embodiment of the present application, the haze of the intermediate layer 103 is set to any value of [5%, 40%] to suppress flash points and maintain the definition of the display screen 100. For example, the haze of the intermediate layer 103 may be any value of 5%, 7%, 8%, 10%, 12%, 15%, 20%, 22%, 23%, 25%, 30%, 33%, 35%, or 40%.

[0135] In this embodiment of the present application, the haze of the intermediate layer 103 may alternatively be any value of [40%, 95%]. In other words, the haze of the intermediate layer may be 40% or 95%, or any value greater than 40% and less than 95%. For example, the value may be any value such as 40%, 45%, 50%, 55%, 60%, 67%, 70%, 72%, 78%, 80%, 85%, 90%, or 92%. In this solution, flash points can be suppressed while the definition of the display screen can be maintained.

[0136] In a possible implementation, a particular material may be selected for the intermediate layer 103 so that the intermediate layer 103 can scatter the display light.

[0137] In another possible implementation, the intermediate layer 103 may include scattering particles, which may be configured to adjust the haze of the intermediate layer 103. For example, the scattering ability (haze) of the intermediate layer 103 may be adjusted by changing several factors, such as the concentration of the scattering particles, the refractive index of the scattering particles, and the size of the scattering particles.

[0138] In general, the refractive index of the scattering particles may be any value in the range [1.4, 2.5]. In other words, the refractive index of the scattering particles may be 1.4, or 2.5, or any value greater than 1.4 and less than 2.5.

[0139] In order to further suppress flash points, in a possible implementation, the area of ​​the orthogonal projection image of the scattering particles along the thickness direction is equal to or less than the area of ​​the orthogonal projection image of the microstructure unit along the thickness direction. In this case, similar to the microstructure unit, the scattering particles of the intermediate layer 103 only bend the light rays generated by one subpixel, and the light rays bent by the scattering particles are incident on the corresponding microstructure unit. Therefore, different microstructure units may receive similar incident light rays. This further helps to suppress flash points. In general, the size of the scattering particles needs to be greater than 1 μm to maintain the scattering ability of the scattering particles.

[0140] It should be noted that the intermediate layer 103 shown in Fig. 8 may be directly added to the existing structure of the display screen 100, or may be realized based on the original functional layers of the display screen 100. In other words, the intermediate layer 103 may further realize another function while scattering the display light.

[0141] For example, the intermediate layer 103 may include an optical adhesive layer. For example, as shown in Fig. 7, an optical adhesive layer 1031 is provided between the display panel 101 and the transmissive layer 102, and the optical adhesive layer 1031 includes scattering particles, so that the display light generated by the display panel 101 can be scattered. In addition, the optical adhesive layer 1031 may further fix the display panel 101 and the transmissive layer 102. This implementation has little impact on the structure of the display screen 100 and is easy to realize.

[0142] In a possible implementation, as shown in Fig. 7, the optical adhesive layer 1031 can include a first optical adhesive layer 1031-1, a second optical adhesive layer 1031-2, and a third optical adhesive layer 1031-3. The second optical adhesive layer 1031-2 includes the aforementioned scattering particles, and the first optical adhesive layer 1031-1 and the third optical adhesive layer 1031-3 can be optical adhesive layers of conventional materials. The first optical adhesive layer 1031-1 is provided on the surface of the second optical adhesive layer 1031-2 that is closer to the display panel 101, and the third optical adhesive layer 1031-3 is provided on the surface of the second optical adhesive layer 1031-2 that is closer to the transmissive layer 102.

[0143] In this implementation, the optical adhesive layer 1031 is a sandwich structure. The second optical adhesive layer 1031-2 can have the function of enhancing scattering, and the first optical adhesive layer 1031-1 and the third optical adhesive layer 1031-3 can maintain the original function of the optical adhesive layer 1031 to prevent scattering particles from affecting the adhesive effect of the optical adhesive layer 1031.

[0144] In another example, as shown in FIG. 11, the display screen 100 may be a touch screen. In this case, the intermediate layer 103 may further include a touch layer 1032. The touch layer 1032 may generate a touch signal so that the display screen 100 can realize a touch function. For example, the touch layer 1032 may include a sensor array, and may sense a user's operation gesture on the surface of the display screen 100 to generate a touch signal. In this embodiment of the present application, scattering particles may be further added to the touch layer 1032 so that the touch layer 1032 can scatter display light.

[0145] Case 2: The intermediate layer is located inside the display panel 101 and / or the transmissive layer 102. For example, both the LCD display panel 101 (shown in FIG. 2) and the OLED display panel 101 (shown in FIG. 5) include a polarizing layer. Scattering particles may be provided in the polarizing layer as the intermediate layer 103. For example, scattering particles may be added to tri-cellulose acetate (TCA) of the polarizing layer to reduce interference to the original function of the polarizing layer.

[0146] It should be noted that in this embodiment of the present application, scattering particles can be provided not only in the intermediate layer, but also in another layer structure located in the transmission path of the display light. For example, scattering particles can also be added to the cover plate 1021 to suppress the flash point of the display screen 100. Details will not be described again.

[0147] In a possible implementation, the display panel 101 can further include a wide-angle layer 208. The wide-angle layer 208 can expand the viewing angle of the display light, so that the spatial distribution of the display light is more similar to the spatial distribution of the paper-reflected light, so as to further optimize the paper-like display effect. Similarly, a diffusion sheet may also be provided in the backlight module 201, so that the viewing angle of the display light can also be further expanded, and the paper-like display effect can be optimized. In addition, the provision of a diffusion sheet can further reduce the flash point generated by the internal interference of the display panel 101. This also helps to further optimize the flash point.

[0148] Based on the same technical concept, an embodiment of the present application further provides a display screen protection film. The display screen protection film may be laminated on the light-emitting surface of the display screen by pasting or vacuum adsorption. The display screen protection film includes a rough surface. The rough surface may include a plurality of microstructure units. The orthogonal projection image of the microstructure unit along the thickness direction is located in the pixel area, and the projected area of ​​the microstructure unit is equal to or less than the area of ​​the pixel area. The microstructure unit is a curved surface. In this embodiment of the present application, the pixel area includes an area where the subpixel is located on the display screen, and a separation area between the subpixel and another subpixel located around the subpixel and adjacent to the subpixel.

[0149] The display screen protection film provided in this embodiment of the present application can enable a non-paper-like display screen to realize a paper-like display, and can further suppress flash points. The rough surface of the display screen protection film provided in this embodiment of the present application has topographical characteristics similar to those of the first surface of the transmissive layer 102. Details will not be described again.

[0150] To further suppress flash points, in a possible implementation, the orthogonal projection images of at least two of the microstructure units are located within a sub-region of the pixel region, which may include a region with a sub-pixel between the sub-pixel and any adjacent sub-pixels.

[0151] In general, the height of each microstructure unit is any value in the range [0.5 μm, 1.5 μm]. The height of each microstructure unit is the distance between the apex and the valley bottom of the microstructure unit. Specifically, the apex of the microstructure unit is the point in the microstructure unit that is the maximum distance from the display screen. The valley bottom of the microstructure unit is the point in the microstructure unit that is the minimum distance from the display screen. For example, the height of the microstructure unit may be any value, such as 0.5 μm, 0.8 μm, 1 μm, 1.2 μm, or 1.5 μm.

[0152] Furthermore, the height of each microstructure unit may be any value between [1.5 μm, 4 μm]. Specifically, the height of each microstructure unit may be 1.5 μm, or 4 μm, or any value greater than 1.5 μm and less than 4 μm. For example, the height of the microstructure unit may be any value, such as 1.5 μm, 1.8 μm, 2 μm, 2.5 μm, 2.7 μm, 3 μm, 3.4 μm, 3.5 μm, 3.8 μm, or 4 μm.

[0153] In order to improve the paper-like display effect, in a possible implementation, the arithmetic mean height Ra of the multiple microstructure units on the rough surface in any length parallel to any direction of the display screen is an arbitrary value of [0.1 μm, 1 μm]. The arithmetic mean height Ra represents the arithmetic mean value of the absolute value of the vertical distance between the tangential contour line of the multiple microstructure units and the center line within any length range on the vertical tangential plane along any direction and thickness direction. The center line is a straight line on the vertical tangential plane parallel to any direction, and the sum of the areas of the multiple regions formed by the tangential contour line and center line of the multiple microstructure units is equal to the sum of the areas of the multiple regions formed by the tangential contour line and center line of every two adjacent microstructure units.

[0154] Furthermore, the arithmetic mean height Ra of the multiple microstructure units may alternatively be any value in the range of [0.2 μm, 0.5 μm]. Specifically, the arithmetic mean height Ra may be 0.2 μm, or 0.5 μm, or any value greater than 0.2 μm and less than 0.5 μm. For example, the arithmetic mean height Ra of the microstructure units may be any value, such as 0.2 μm, 0.25 μm, 0.3 μm, 0.34 μm, 0.4 μm, or 0.5 μm.

[0155] In order to improve the paper-like display effect, a possible implementation is that the density of the microstructure units is 5000 / mm on the rough surface. 2 That's all.

[0156] In order to further suppress flash points, the ratio Ra / Rsm of the arithmetic mean height Ra of the microstructure units to the average length Rsm of the contour curve elements of the microstructure units on the rough surface within any length range parallel to any direction of the display screen is 0.5% or more. The meaning of the arithmetic mean height Ra will not be explained again. The average length Rsm of the contour curve elements represents the average value of the projected length on the center line of the connecting lines between the vertices of the tangent contours of every two adjacent microstructure units in the tangent contours of the microstructure units within any length range on the vertical tangent plane along any direction and the thickness direction. The vertex of the tangent contour is the point in the tangent contour that is the furthest from the display screen.

[0157] In a possible implementation, the display screen protection film is an anti-reflective coating to help suppress the interference of ambient light on the contrast of the displayed picture and to eliminate the "picture bleaching" problem caused by diffuse reflection.

[0158] It is obvious that a person skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. This application is intended to cover these modifications and variations of this application, provided that they fall within the scope of protection defined by the following claims and their equivalent technologies. [Explanation of symbols]

[0159] 100 display screens 101 Display Panel 102 Transparent layer 103 Middle Class 201 Backlight module 202 Lower polarizing layer 203, 206 Glass substrate 204 Liquid crystal molecular layer 205 Color photoresist layer 207 Upper polarizing layer 208 Wide Corneal Layer 401, 501 board 402, 502 Light-emitting layer 403, 503 Encapsulation layer 504 Polarizing layer 1021 Cover plate 1022 Coating film 1031 Optical adhesive layer 1031-1 First Optical Adhesive Layer 1031-2 Second Optical Adhesive Layer 1031-3 Third Optical Adhesive Layer 1032 Touch Layer

Claims

1. A display screen comprising a display panel and a transmissive layer stacked in sequence, the display panel is configured to generate a display light beam; the transmissive layer is configured to transmit the display light, the transmissive layer has a first surface away from the display panel, the first surface comprises a plurality of microstructure units, an orthogonal projection image of each microstructure unit along a thickness direction is located within a pixel region, a projected area of ​​the microstructure unit is equal to or smaller than an area of ​​the pixel region, the microstructure units are curved, and the pixel region comprises a region where a subpixel is located on the display panel, and a separation region between the subpixel and another subpixel located adjacent to the subpixel around the subpixel; display screen.

2. 2. The display screen of claim 1, wherein the orthogonal projection images of at least two microstructure units are located within a sub-region of the pixel region, the sub-region comprising the region in which the sub-pixel is located and a separation region between the sub-pixel and any adjacent sub-pixels.

3. 2. The display screen of claim 1, wherein the height of each microstructure unit is an arbitrary value in the range [0.5 μm, 1.5 μm], the height of each microstructure unit is the distance between the apex and the valley bottom of the microstructure unit, the apex of the microstructure unit being a point within the microstructure unit that is the greatest distance from the display panel, and the valley bottom of the microstructure unit being a point within the microstructure unit that is the smallest distance from the display panel.

4. 2. The display screen of claim 1, wherein the height of each microstructure unit is an arbitrary value in the range [1.5 μm, 4 μm], the height of each microstructure unit is the distance between the apex and the valley bottom of the microstructure unit, the apex of the microstructure unit being a point within the microstructure unit that is the greatest distance from the display panel, and the valley bottom of the microstructure unit being a point within the microstructure unit that is the smallest distance from the display panel.

5. 2. The display screen of claim 1, wherein, in any length range on the first surface parallel to any direction of the display panel, the arithmetic mean height Ra of the multiple microstructure units is any value in the range [0.1 μm, 1 μm], the arithmetic mean height Ra represents the arithmetic mean of the absolute values ​​of the perpendicular distances between the tangential contour of the multiple microstructure units and a center line within the arbitrary length range on a vertical tangential plane along the arbitrary direction and the thickness direction, the center line being a straight line on the vertical tangential plane parallel to the arbitrary direction, and the sum of the areas of the multiple regions formed by the tangential contour and the center line of the multiple microstructure units is the same as the sum of the areas of the multiple regions formed by the tangential contour and the center line of every two adjacent microstructure units.

6. The display screen of claim 5, wherein the arithmetic mean height Ra of the plurality of microstructure units on the first surface and within the arbitrary length range parallel to the arbitrary direction of the display panel is an arbitrary value in the range [0.2 μm, 0.5 μm].

7. On the first surface, the density of the microstructural units is 5000 / mm ２ The display screen according to claim 1 .

8. a ratio Ra / Rsm of an arithmetic mean height Ra of the plurality of microstructure units to an average length Rsm of contour curve elements of the plurality of microstructure units is 0.5% or more within an arbitrary length range on the first surface parallel to an arbitrary direction of the display panel; the arithmetic mean height Ra represents an arithmetic mean value of the absolute value of the perpendicular distance between the tangential contour of the plurality of microstructure units and a center line within the arbitrary length range on a longitudinal tangential plane along the arbitrary direction and the thickness direction, the center line being a straight line on the longitudinal tangential plane parallel to the arbitrary direction, the sum of the areas of the plurality of regions formed by the tangential contour and the center line of the plurality of microstructure units is equal to the sum of the areas of the plurality of regions formed by the tangential contour and the center line of every two adjacent microstructure units, The average length Rsm of the contour curve element represents an average value of the projected length on the center line of the connecting lines between the vertices of the tangent contours of every two adjacent microstructure units in the tangent contours of the microstructure units within the arbitrary length range on the vertical tangent plane along the arbitrary direction and the thickness direction, and the vertices of each tangent contour are the points within the tangent contour that are farthest from the display panel.

2. The display screen of claim 1.

9. 2. A display screen as claimed in claim 1, wherein within a deviation of 1[deg.] from the angle of reflection, the attenuation of the reflected light of the first surface is less than 5%.

10. 2. The display screen of claim 1, wherein within a deviation of 1° from the reflection angle, the attenuation of the reflected light of the first surface is any value in the range [5%, 10%].

11. 11. The display screen of claim 1, further comprising an intermediate layer located between the display panel and the transmissive layer, the intermediate layer configured to scatter the display light.

12. The display screen of claim 11 , wherein the intermediate layer comprises an optical adhesive layer, the optical adhesive layer configured to adhere the display panel to the transmissive layer.

13. the intermediate layer comprises a first optical adhesive layer, a second optical adhesive layer, and a third optical adhesive layer stacked together, the second optical adhesive layer being located between the first optical adhesive layer and the third optical adhesive layer; the second optical adhesive layer comprises scattering particles, the first optical adhesive layer is provided on a surface of the second optical adhesive layer that is closer to the display panel, and the third optical adhesive layer is provided on a surface of the second optical adhesive layer that is closer to the transmissive layer.

13. A display screen according to claim 12.

14. The display screen of claim 11 , wherein the intermediate layer comprises a touch layer, the touch layer configured to generate a touch signal.

15. 11. A display screen as claimed in any one of claims 1 to 10, wherein the display panel comprises an intermediate layer, the intermediate layer being disposed adjacent to the transmissive layer, the intermediate layer being configured to scatter the display light.

16. 16. The display screen of claim 15, wherein the intermediate layer comprises a polarizing layer of the display panel.

17. 17. The display screen according to claim 11, wherein the haze of the intermediate layer is an arbitrary value in the range of [5% to 40%].

18. 17. The display screen according to claim 11, wherein the haze of the intermediate layer is an arbitrary value in the range of [40%, 95%].

19. 19. A display screen according to any one of claims 11 to 18, wherein the intermediate layer comprises scattering particles, the scattering particles being used to adjust the haze of the intermediate layer.

20. 20. A display screen according to claim 11, wherein an area of ​​an orthogonal projection of a scattering particle along the thickness direction is equal to or smaller than an area of ​​an orthogonal projection of the microstructure unit along the thickness direction.

21. 21. A display screen according to any one of claims 11 to 20, wherein the refractive index of the scattering particles is any value in the range [1.4, 2.5].

22. 22. A display screen as claimed in any one of the preceding claims, wherein the transmissive layer comprises a cover plate, the surface of the cover plate remote from the display panel being the first surface of the transmissive layer.

23. the transmissive layer includes a cover plate and a coating film, the cover plate being disposed between the display panel and the coating film; one surface of the coating film is fixed to the cover plate, and the other surface of the coating film is the first surface of the transmission layer; 23. A display screen according to any one of the preceding claims.

24. A display screen protection film, the display screen protection film having a rough surface, the rough surface comprises a plurality of microstructure units, an orthogonal projection image of each microstructure unit along a thickness direction is located within a pixel region, a projection area of ​​the microstructure unit is equal to or smaller than an area of ​​the pixel region, the microstructure unit is a curved surface, and the pixel region comprises a region where a subpixel is located on a display screen, and a separation region between the subpixel and another subpixel located adjacent to the subpixel around the subpixel; Display screen protective film.

25. 25. The display screen protection film of claim 24, wherein the orthogonal projection images of at least two microstructure units are located within a sub-region of the pixel region, the sub-region comprising the region in which the sub-pixel is located and a separation region between the sub-pixel and any adjacent sub-pixels.

26. 25. The display screen protection film of claim 24, wherein the height of each microstructure unit is an arbitrary value in the range [0.5 μm, 1.5 μm], the height of each microstructure unit is the distance between the apex and the valley bottom of the microstructure unit, the apex of the microstructure unit being a point within the microstructure unit that is the greatest distance from the display screen, and the valley bottom of the microstructure unit being a point within the microstructure unit that is the smallest distance from the display screen.

27. 25. The display screen protection film of claim 24, wherein the height of each microstructure unit is any value in the range [1.5 μm, 4 μm], the height of each microstructure unit is the distance between the apex and the valley bottom of the microstructure unit, the apex of the microstructure unit being a point within the microstructure unit that is the greatest distance from the display screen, and the valley bottom of the microstructure unit being a point within the microstructure unit that is the smallest distance from the display screen.

28. 25. The display screen protective film of claim 24, wherein, in any length range on the rough surface parallel to any direction of the display screen, the arithmetic mean height Ra of the multiple microstructure units is any value in the range [0.1 μm, 1 μm], the arithmetic mean height Ra represents the arithmetic mean of the absolute values ​​of the perpendicular distances between the tangential contour of the multiple microstructure units and a center line within the arbitrary length range on a vertical tangential plane along the arbitrary direction and the thickness direction, the center line being a straight line on the vertical tangential plane parallel to the arbitrary direction, and the sum of the areas of the multiple regions formed by the tangential contour and the center line of the multiple microstructure units is the same as the sum of the areas of the multiple regions formed by the tangential contour and the center line of every two adjacent microstructure units.

29. 29. The display screen protection film of claim 28, wherein the arithmetic mean height Ra of the plurality of microstructure units on the rough surface and within the arbitrary length range parallel to the arbitrary direction of the display screen is an arbitrary value in the range [0.2 μm, 0.5 μm].

30. On the rough surface, the density of the microstructural units is 5000 / mm ２ The display screen protection film according to claim 24.

31. a ratio Ra / Rsm of an arithmetic mean height Ra of the plurality of microstructure units to an average length Rsm of contour curve elements of the plurality of microstructure units is 0.5% or more within an arbitrary length range on the rough surface parallel to an arbitrary direction of the display screen; the arithmetic mean height Ra represents an arithmetic mean value of the absolute value of the perpendicular distance between the tangential contour of the plurality of microstructure units and a center line within the arbitrary length range on a longitudinal tangential plane along the arbitrary direction and the thickness direction, the center line being a straight line on the longitudinal tangential plane parallel to the arbitrary direction, the sum of the areas of the plurality of regions formed by the tangential contour and the center line of the plurality of microstructure units is equal to the sum of the areas of the plurality of regions formed by the tangential contour and the center line of every two adjacent microstructure units, The average length Rsm of the contour curve element represents an average value of the projected length on the center line of the connection lines between the vertices of the tangent contour of every two adjacent microstructure units in the tangent contour of the plurality of microstructure units within the arbitrary length range on the vertical tangent plane along the arbitrary direction and the thickness direction, and the vertex of the tangent contour is the point in the tangent contour that is the farthest from the display screen. The display screen protection film according to claim 24.

32. 24. An electronic device comprising a display screen according to any one of claims 1 to 23.

33. 32. An electronic device comprising a display screen and a display screen protective film according to any one of claims 24 to 31, wherein the display screen protective film is fixed to a light exit surface of the display screen, and a rough surface of the display screen protective film is provided away from the display screen.

Images