Display module and terminal device

Abstract

The application relates to the display field and discloses a display module and a terminal device. The display module comprises a reflecting screen, a front light unit, a scattering structure layer, a first optical adhesive layer, a touch screen and a second optical adhesive layer. The light-emitting side of the front light unit faces the reflecting screen. The scattering structure layer is located between the front light unit and the reflecting screen. The scattering surface of the scattering structure layer, which is away from the front light unit, is used for converting the light emitted from the front light unit into scattered light and emitting the scattered light into the reflecting screen. The first optical adhesive layer is located between the scattering structure layer and the reflecting screen. The touch screen is located on the side of the front light unit away from the reflecting screen. The second optical adhesive layer is located between the touch screen and the front light unit. When the front light is turned on, the light emitted from the front light unit first enters the scattering structure layer and is emitted after the scattering surface of the scattering structure layer, so that the light emitted from the front light unit is effectively converted into multi-angle scattered light similar to sunlight, the scattering and multi-dimensional directional light path of the sunlight are simulated, and the problems of reduced color gamut, reduced contrast and reduced comfort of the reflecting screen after the front light is turned on are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display devices, in particular to a display module and a terminal device. BACKGROUND

[0002] In the current front light reflection type display module, after the front light is turned on, there are generally problems such as color gamut reduction, contrast reduction, comfort reduction, and the like, and the reading contrast under outdoor sunlight is obviously different, which reduces the user experience, display effect and eye protection effect of the reflection screen. SUMMARY

[0003] The present application discloses a display module and a terminal device, which are used to alleviate the problems such as color gamut reduction, contrast reduction, comfort reduction, and the like of the reflection screen after the front light is turned on.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0005] In a first aspect, the present application provides a display module, comprising:

[0006] a reflection screen;

[0007] a front light unit located on one side of the reflection screen, the light emitting side of the front light unit facing the reflection screen;

[0008] a scattering structure layer located between the front light unit and the reflection screen, the scattering structure layer forming a scattering surface on the side away from the front light unit for converting the light emitted from the front light unit into scattered light and emitting into the reflection screen;

[0009] a first optical adhesive layer located between the scattering structure layer and the reflection screen;

[0010] a touch screen located on the side of the front light unit away from the reflection screen;

[0011] a second optical adhesive layer located between the touch screen and the front light unit.

[0012] The display module includes a touch screen, a second optical adhesive layer, a front light unit, a scattering structure layer, a first optical adhesive layer and a reflection screen which are sequentially stacked, when the front light of the display module is turned on, the light emitted from the front light unit first enters the scattering structure layer, and after being emitted through the scattering surface of the scattering structure layer, the light emitted from the front light unit is effectively converted into scattered light of multiple angles similar to sunlight, simulating the scattering and multi-dimensional directional light path of sunlight, thereby alleviating the problems such as color gamut reduction, contrast reduction, comfort reduction, and the like of the reflection screen after the front light is turned on.

[0013] In some embodiments, the scattering structure layer forms a concave-convex microstructure on the side facing the reflection screen, and the concave-convex microstructure forms the scattering surface on the surface of the side facing the reflection screen.

[0014] In some embodiments, the concave-convex microstructure comprises a plurality of convex parts protruding towards the reflective screen, and the height of at least some of the plurality of convex parts is different along the normal direction of the scattering structure layer.

[0015] In some embodiments, the convex part is an arc surface facing the side surface of the reflective screen, and a plurality of the arc surfaces are connected to form the scattering surface.

[0016] In some embodiments, the central angle of at least some of the plurality of arc surfaces is different.

[0017] In some embodiments, the display screen comprises a plurality of pixel units, each of which comprises a plurality of sub-pixels, and the convex part corresponds to the sub-pixel one-to-one.

[0018] In some embodiments, the diameter of the arc surface and the reflection coefficient of the sub-pixel are proportional one-to-one.

[0019] In some embodiments, the front light unit comprises:

[0020] a light guide plate;

[0021] a light emitting element mounted towards the side surface adjacent to the light emitting surface of the light guide plate;

[0022] a dot structure formed on the light emitting surface of the light guide plate, and the scattering structure layer is located on the side of the dot structure facing the reflective screen.

[0023] In some embodiments, the density of the concave-convex microstructure is positively correlated with the density of the dot structure; and / or,

[0024] In some embodiments, the diameter of the arc surface gradually decreases in the direction away from the light emitting element.

[0025] In a second aspect, the present application also provides a terminal device comprising the display module according to any one of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The structure of the front light unit and the light path schematic diagram in the related art;

[0027] Figure 2 The structure schematic diagram of a display module provided by the embodiments of the present application;

[0028] Figure 3 The light path diagram of the scattering surface in the middle; Figure 2

[0029] Figure 4 ​Another structure schematic view of the front light unit and the scattering structure in the display module provided by the embodiment of the present application is provided.

[0030] Figure 5a And Figure 5b Another structure schematic view of the front light unit and the scattering structure in the display module provided by the embodiment of the present application is provided.

[0031] Figure 6a And Figure 6b Another structure schematic view of the front light unit and the scattering structure in the display module provided by the embodiment of the present application is provided.

[0032] Icon: 100-reflective screen; 200-first optical adhesive layer; 300-scattering structure layer; 400-front light unit; 500-second optical adhesive layer; 600-touch screen; 310-protruding part; 410-light guide plate; 420-light emitting element; 430-dot structure. DETAILED DESCRIPTION

[0033] In the related art, the front light unit 400 of the reflective screen includes a light guide plate 410 and a light emitting element 420. The point light source emitted by the light source, i.e., the LED, is converted into a surface light source by the light guide plate 410, and is irradiated to the display screen. Referring to Figure 1 , the light emitted by the light guide plate 410 is a directional light source. After the light is emitted from the dot structure 430 of the light guide plate 410, it is incident on the reflective screen according to the set light path, and enters the human eye after being reflected by the reflective screen. Since the dot light emitted by the front light unit 400 can only be incident on the reflective screen at a set angle, the light path entering the reflective screen is also fixed. Therefore, the viewing angle of the reflective screen becomes relatively narrow, and problems such as reduced viewing angle, reduced contrast, and reduced color gamut occur. The surface of the reflective screen, especially the electronic paper reflective screen such as the ink screen and the plasma screen, is a diffuse reflection material, which can uniformly reflect light at different angles to improve the comfort of the human eye. Therefore, the front light unit capable of emitting diffuse reflection and multi-angle light path light is more suitable for the reflective display module than the front light unit with a single direction or fixed light path direction.

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0035] In a first aspect, as Figure 2 indicated, the embodiment of the present application provides a display module, comprising:

[0036] a reflective screen 100;

[0037] The front light unit 400 is located on one side of the reflective screen 100, and the light emitting side of the front light unit 400 faces the reflective screen 100.

[0038] A scattering structure layer 300 is located between the front light unit 400 and the reflective screen 100. The side of the scattering structure layer 300 away from the front light unit 400 forms a scattering surface for converting the light emitted from the front light unit 400 into scattered light and into the reflective screen 100.

[0039] The first optical adhesive layer 200 is located between the scattering structure layer 300 and the reflective screen 100;

[0040] A touch screen 600 located on the side of the front light unit 400 away from the reflective screen 100;

[0041] The second optical adhesive layer 500 is located between the touch screen 600 and the front light unit 400.

[0042] Reference Figure 2 and Figure 3 The display module includes a touch screen 600, a second optical adhesive layer 500, a front light unit 400, a scattering structure layer 300, a first optical adhesive layer 200, and a reflective screen 100, which are stacked in sequence. When the front light of the display module is turned on, the light emitted from the front light unit 400 first enters the scattering structure layer 300. After being emitted through the scattering surface of the scattering structure layer 300, the light emitted from the front light unit 400 is effectively converted into multi-angle scattered light similar to sunlight, simulating the scattering of sunlight and multi-dimensional light paths, thereby alleviating problems such as reduced color gamut, reduced contrast, and reduced comfort of the reflective screen 100 after the front light is turned on.

[0043] It should be noted that the main function of the scattering surface in the scattering structure layer 300 is to disperse the light emitted from the front light unit 400, thereby making the light emitted from the scattering surface closer to sunlight. Therefore, any structure that can achieve the above function can be used as the scattering structure layer 300 referred to in this embodiment.

[0044] In some embodiments, the front light unit 400 includes:

[0045] Light guide plate 410;

[0046] The light-emitting element 420 is mounted on the side facing the light-emitting surface of the light guide plate 410.

[0047] The dot structure 430 formed on the light-emitting surface of the light guide plate 410 has a scattering structure layer 300 located on the side of the dot structure 430 facing the reflective screen 100.

[0048] In one possible implementation, refer to Figure 2The front light unit 400 includes a light guide plate 410 and a light-emitting element 420. A dotted structure 430 is formed on the light-emitting side of the light guide plate 410. For example, the light guide plate 410 is a side-lit light guide plate 410, and the light-emitting element 420 can specifically be an LED light strip. LED light rays are guided into the light guide plate 410 through its side surface. The dotted structure 430 on the light guide plate 410 evenly distributes and transmits the light to the light-emitting side of the light guide plate 410, ultimately achieving a full-surface light source and ensuring uniform light distribution.

[0049] In one possible implementation, the light guide plate 410 forms dots with specific angles and shapes on the surface of a PMMA (polymethylmethacrylate) / PET (polyethylene terephthalate) substrate through methods such as hot stamping and perforation. These dots can convert light within the PMMA / PET substrate into light emitted at a specific angle and brightness; that is, the light emitted from the dot structure 430 of the light guide plate 410 is directional. However, since the front light source is itself a side light source, and the light enters the interior of the light guide plate 410 from its side or cross-section, the light guide plate 410 needs to convert the side light source into a surface light source and must have the function of light conduction. During the light conduction process, scattering is not allowed, as scattering would hinder the light conduction capability. (Refer to...) Figure 2 and Figure 3 In this embodiment, by adding a scattering structure layer 300 to the dot surface of the light guide plate 410, the directional light emitted from the dot surface of the light guide plate 410 is transformed into scattered light. The scattered light is closer to the light path of sunlight and is more in line with the diffuse reflection characteristics of the reflective screen 100.

[0050] In one possible implementation, the scattering structure layer 300 has high transmittance and low reflectance, enabling most of the light emitted from the dotted surface of the light guide plate 410 to be projected onto the surface of the reflective screen 100, reducing the amount of ineffective light that enters the human eye directly without being reflected by the reflective screen 100. For example, the scattering structure layer 300 is a multilayer film structure, and the materials include glass, oxide thin film layers, etc.

[0051] In some embodiments, the scattering structure layer 300 forms a concave-convex microstructure on the side facing the reflective screen 100, and the surface of the concave-convex microstructure on the side facing the reflective screen 100 forms a scattering surface.

[0052] In one possible implementation, the concave-convex microstructure is formed by creating grooves on the side of the scattering structure layer 300 facing the reflective screen 100. The scattering effect of the scattering surface can be changed by controlling the opening and depth dimensions of the grooves, which is convenient and easy to operate.

[0053] In one possible implementation, the concave-convex microstructure is formed by adding multiple protrusions to a portion of the surface of the scattering structure layer 300 facing the reflective screen 100. The scattering effect of the scattering surface can be changed by controlling the shape, size, and density of the multiple protrusions, which is convenient and easy to operate.

[0054] In one possible implementation, the concave-convex microstructure is formed by adding multiple protrusions to the surface of the scattering structure layer 300 facing the reflective screen 100. The scattering effect of the scattering surface can be changed by controlling the shape, size and density of all the protrusions, which is convenient and easy to operate.

[0055] In some embodiments, the scattering surface formed by the concave and convex microstructure is a wavy surface, which can more easily disperse the light emitted from the front light unit 400, making the light emitted from the wavy surface closer to sunlight.

[0056] It should be noted that the graphic design of concave and convex microstructures can be carried out in at least the following ways, but is not limited to these:

[0057] Method 1: The concave-convex microstructure can be specifically designed based on the reflection coefficient of the reflective screen 100, such as the bidirectional reflection distribution function (BRDF).

[0058] In some embodiments of this approach, the concave-convex microstructure includes a plurality of protrusions 310 that protrude toward the reflective screen 100, and at least some of the protrusions 310 have different heights along the normal direction of the scattering structure layer 300.

[0059] For example, the protrusion 310 is a spherical protrusion or a columnar protrusion. The scattering surface formed by the protrusions 310 with different heights is uneven, resulting in a good scattering effect.

[0060] In some embodiments of this method, the surface of the protrusion 310 facing the reflective screen 100 is an arc-shaped surface, and multiple arc-shaped surfaces are connected to form a scattering surface.

[0061] In one possible implementation, refer to Figure 4 The cross-section of the scattering surface is formed by multiple arcs, creating a wave-like shape. Compared to the sawtooth shape formed by straight lines, the scattering effect is better.

[0062] In some embodiments of this method, at least some of the arc surfaces have different center angles.

[0063] It should be noted that different central angles correspond to different arc lengths. For example, some curved surfaces are one-quarter of the arc length, some are semicircles, and some are three-quarters of the arc length. The arc length of the curved surface is determined based on the reflectivity of the reflector 100. For example, the specific design principle can be:

[0064] If the BRDF angle of the reflective screen 100 is narrow, it needs to be combined with a gently curved concave-convex microstructure to facilitate the scattering of light into a wider range of light sources, approximately 0°-180°. This increases the BRDF of the reflective screen 100 by increasing the angle range of the light source illuminating the surface of the reflective screen 100. Conversely, if the BRDF angle of the reflective screen 100 is wide, the graphic design of the concave-convex microstructure can be designed as a steeper arc.

[0065] Method 2: The concave-convex microstructure can be specifically designed according to the arrangement of each sub-pixel in the reflective screen 100.

[0066] In some embodiments of this approach, the concave-convex microstructure includes a plurality of protrusions 310 that protrude toward the reflective screen 100, and at least some of the protrusions 310 have different heights along the normal direction of the scattering structure layer 300.

[0067] For example, the protrusion 310 is a spherical protrusion or a columnar protrusion. The scattering surface formed by the protrusions 310 with different heights is uneven, resulting in a good scattering effect.

[0068] In some embodiments of this method, the surface of the protrusion 310 facing the reflective screen 100 is an arc-shaped surface, and multiple arc-shaped surfaces are connected to form a scattering surface.

[0069] In one possible implementation, refer to Figure 5a and Figure 5b The cross-section of the scattering surface is formed by multiple arcs, creating a wave-like shape. Compared to the sawtooth shape formed by straight lines, the scattering effect is better.

[0070] In some embodiments of this approach, the display screen includes multiple pixel units, each pixel unit including multiple sub-pixels, and the protrusion 310 corresponds one-to-one with each sub-pixel. For example, as... Figure 5a As shown, the pixel unit of the display screen includes a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B, or, as... Figure 5b As shown, the pixel unit of the display screen includes a red sub-pixel R, a green sub-pixel G, a blue sub-pixel B, and a white sub-pixel W. Different sub-pixels have different reflectance coefficients.

[0071] In some embodiments of this method, in the one-to-one correspondence of the protrusion 310 and the sub-pixel, the diameter of the arcuate surface is proportional to the reflectance coefficient of the sub-pixel.

[0072] In one possible implementation, refer to Figure 5a The pixel unit of the display screen includes red sub-pixel R, green sub-pixel G and blue sub-pixel B, with the reflectivity increasing sequentially, and the arc length diameter corresponding to the protrusion 310 also gradually increasing.

[0073] In one possible implementation, refer to Figure 5b The pixel unit of the display screen includes red sub-pixel R, green sub-pixel G, blue sub-pixel B and white sub-pixel W, with the reflectivity increasing sequentially, and the arc length diameter corresponding to the protrusion 310 also gradually increasing.

[0074] For example, blue, green, and white are relatively bright colors because they have high reflectivity, so the pattern diameter of the scattering layer needs to be designed to be larger to relatively reduce the light intensity of the green sub-pixel G, blue sub-pixel B, and white sub-pixel W regions; red is a relatively dark color because it has relatively low reflectivity, so the pattern diameter of the scattering structure layer 300 needs to be designed to be smaller to relatively increase the light intensity of the red sub-pixel R region.

[0075] Method 3: The concave-convex microstructure can be specifically designed according to the dot distribution of the dot structure 430 in the front light unit 400.

[0076] In some embodiments of this approach, the concave-convex microstructure includes a plurality of protrusions 310 that protrude toward the reflective screen 100, and at least some of the protrusions 310 have different heights along the normal direction of the scattering structure layer 300.

[0077] For example, the protrusion 310 is a spherical protrusion or a columnar protrusion. The scattering surface formed by the protrusions 310 with different heights is uneven, resulting in a good scattering effect.

[0078] In some embodiments of this method, the surface of the protrusion 310 facing the reflective screen 100 is an arc-shaped surface, and multiple arc-shaped surfaces are connected to form a scattering surface.

[0079] In one possible implementation, refer to Figure 6a The cross-section of the scattering surface is formed by connecting multiple arcs with straight lines; refer to Figure 6b The cross-section of the scattering surface is formed by multiple arcs, creating a wave-like shape. Compared to the sawtooth shape formed by straight lines, the scattering effect is better.

[0080] In some embodiments of this method, the density of the uneven microstructure is positively correlated with the density of the dot structure 430; and / or,

[0081] Along the direction away from the light-emitting element 420, the diameter of the arc-shaped surface gradually decreases.

[0082] For example, refer to Figure 6aAlong the direction away from the light-emitting element 420, i.e. the X direction in the figure, the dot density of the light guide plate 410 increases from sparse to dense, and the density of the concave and convex microstructures also increases from sparse to dense. In one possible implementation, the horizontal line added between the two arcs is shortened from long to short, so that the scattered light flux is designed to be a structure from weak to strong.

[0083] For example, refer to Figure 6b Along the direction away from the light-emitting element 420, i.e. the X direction in the figure, the dot density of the light guide plate 410 increases from sparse to dense. At this time, the design of the pattern diameter of the scattering structure layer 300 needs to be from large to small, so that the scattered light flux is designed to be from weak to strong.

[0084] Secondly, embodiments of the present invention also provide a terminal device, including any of the display modules described in the first aspect embodiments.

[0085] It should be noted that the display module provided in this embodiment of the invention can be applied to reflective terminal devices with front lighting, such as monochrome e-ink screens, color e-ink screens, RLCDs, and plasma screens. This invention fully utilizes the display principles of reflective screens such as monochrome e-ink screens, color e-ink screens (RGB), RLCDs, and plasma screens, the dot-matrix light-emitting principle of light guide plates, the front lighting working principle of reflective products, and the working principle of scattering films. It also fully analyzes the characteristics of sunlight source wavelengths and optical paths. The method is simple, reliable, highly practical, and significantly improves the user experience.

[0086] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A display module, characterized in that, include: Reflective screen; A front light unit located on one side of the reflective screen, with the light-emitting side of the front light unit facing the reflective screen; The front light unit includes: Light guide plate; A light-emitting element, wherein the light-emitting element is mounted on a side adjacent to the light-emitting surface of the light guide plate; The dotted structure formed on the light-emitting surface of the light guide plate; A scattering structure layer is located between the front light unit and the reflective screen. The scattering structure layer is situated on the side of the dot structure facing the reflective screen, while the side of the scattering structure layer away from the front light unit forms a scattering surface for converting light emitted from the front light unit into scattered light that enters the reflective screen. The side of the scattering structure layer facing the reflective screen forms a concave-convex microstructure, and the surface of the concave-convex microstructure facing the reflective screen forms the scattering surface. The density of the concave-convex microstructure is positively correlated with the density of the dot structure. A first optical adhesive layer is located between the scattering structure layer and the reflective screen; A touchscreen located on the side of the front light unit opposite to the reflective screen; The second optical adhesive layer is located between the touch screen and the front light unit.

2. The display module according to claim 1, characterized in that, The concave-convex microstructure includes multiple protrusions that bulge towards the reflective screen, and at least some of the protrusions have different heights along the normal direction of the scattering structure layer.

3. The display module according to claim 2, characterized in that, The surface of the protrusion facing the reflective screen is arc-shaped, and multiple arc-shaped surfaces are connected to form the scattering surface.

4. The display module according to claim 3, characterized in that, At least some of the arc-shaped surfaces have different center angles.

5. The display module according to claim 4, characterized in that, The reflective screen includes multiple pixel units, and each pixel unit includes multiple sub-pixels. The protrusions correspond one-to-one with the sub-pixels.

6. The display module according to claim 5, characterized in that, In the one-to-one correspondence between the protrusion and the sub-pixel, the diameter of the arc-shaped surface is proportional to the reflectance coefficient of the sub-pixel.

7. The display module according to claim 3, characterized in that, The diameter of the arc-shaped surface gradually decreases along the direction away from the light-emitting element.

8. A terminal device, characterized in that, Includes the display module as described in any one of claims 1-7.

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