Display

Abstract

The utility model relates to a displayer, the displayer comprises a backlight module, a contrast strengthening film, a first polarizing plate, a liquid crystal display module and a second polarizing plate, the contrast strengthening film is arranged on the light incident side of the first polarizing plate, the contrast strengthening film comprises a base material, a strip-shaped microprism layer arranged on the base material and a filling and leveling layer, wherein the strip-shaped microprism layer comprises a plurality of strip-shaped microprisms which extend along a first direction and are arranged at intervals, each strip-shaped microprism is provided with at least one light guide inclined surface, and the filling layer fills gaps among the strip-shaped microprisms of the strip-shaped microprism layer. The display can improve front view contrast under the effect of providing a wide viewing angle.

Description

Technical Field

[0001] The utility model relates to a display, in particular to a display that can improve the front view contrast under the effect of a wide viewing angle. Background Art

[0002] Displays with characteristics such as high contrast ratio, no gray-scale inversion, slight color deviation, high brightness, rich colors, high color saturation, fast response speed, and wide viewing angle are the current market trend.

[0003] In the existing methods for improving the image quality of the side view of a display, for example, Taiwan Patent TWI645218B in China discloses that a light re-directing film with a double-layer grating surface is placed on the viewing side of a liquid crystal display to improve the phenomenon of color washout or gray-scale inversion when the liquid crystal display has a wide viewing angle, so as to improve the efficiency of the display. Another example is that Taiwan Patent TWI807505B in China discloses that a liquid crystal display includes a light re-directing film, which has strip-shaped microprisms and a plurality of diffraction gratings arranged at the bottom of the intervals between adjacent strip-shaped microprisms to improve the problem of light loss in the side view of the liquid crystal display. These known light re-directing films are combined with a polarizer and arranged on the viewing side of the display. However, these light re-directing films achieve the light uniformity of a wide viewing angle by sacrificing the front view contrast. But in line with the current energy-saving requirements of displays, improving the front view contrast is a problem to be solved. Therefore, it is necessary to improve the front view contrast under the effect of a wide viewing angle. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to provide a display that can improve the front view contrast without affecting the effect of the original wide viewing angle of the display.

[0005] According to one aspect of the utility model, the utility model provides a display, which sequentially includes a backlight module, a contrast enhancement film, a first polarizer, a liquid crystal display module, and a second polarizer. Among them, the contrast enhancement film is arranged on the light incident side of the first polarizer, and the contrast enhancement film includes a substrate, a strip-shaped microprism layer, and a filling layer. Among them, the strip-shaped microprism layer is arranged on the substrate, and the strip-shaped microprism layer includes a plurality of strip-shaped microprisms extending along a first direction and arranged at intervals, and each of these strip-shaped microprisms has at least one light guiding inclined surface, and the filling layer fills the gaps between the strip-shaped microprisms of the strip-shaped microprism layer.

[0006] As an optional technical solution, the contrast enhancement film is attached to the light incident side of the first polarizer with the substrate adjacent to the strip-shaped microprism layer.

[0007] As an alternative technical solution, the maximum bottom width of each of these strip-shaped microprisms in the strip-shaped microprism layer ranges from 0.3 μm to 15.0 μm, the height ranges from 0.9 μm to 10.0 μm, and the bottom spacing width ranges from 0.3 μm to 15.0 μm.

[0008] As an alternative technical solution, at least one light guiding inclined surface of each of these strip-shaped microprisms forms an angle θ with the normal direction of the film surface of the strip-shaped microprism layer in a cross-section perpendicular to the first direction, and the angle θ is not less than 5° and not greater than 15°.

[0009] As an alternative technical solution, the tops of these strip-shaped microprisms in the strip-shaped microprism layer are flat, sharp-cornered or arc-shaped.

[0010] As an alternative technical solution, the maximum bottom width of each of these strip-shaped microprisms in the strip-shaped microprism layer ranges from 3.0 μm to 10.0 μm, the height ranges from 3.0 μm to 6.0 μm, and the bottom spacing width ranges from 3.0 μm to 10.0 μm.

[0011] As an alternative technical solution, the filling layer is located on the light incident side of the first polarizing plate facing the light of the backlight module, and the strip-shaped microprism layer is located on the light exiting side of the filling layer away from the light of the backlight module.

[0012] As an alternative technical solution, the maximum bottom widths of each of these strip-shaped microprisms in the strip-shaped microprism layer are the same or partially the same.

[0013] As an alternative technical solution, the heights of each of these strip-shaped microprisms in the strip-shaped microprism layer are the same or partially the same.

[0014] As an alternative technical solution, the bottom spacing widths of each of these strip-shaped microprisms in the strip-shaped microprism layer are the same or partially the same.

[0015] In summary, for the display of the present utility model, a contrast enhancement film is used on the side of the first polarizing plate adjacent to the backlight module. Compared with the prior art in which the contrast enhancement film is disposed on the light exiting side surface of the second polarizing plate in terms of the method and structure, the display of the present utility model can significantly improve the front view contrast value, and the uniformity of the left and right side viewing angles is close, without sacrificing the uniformity of the light distribution.

[0016] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but it is not intended to limit the present utility model. Description of the Drawings

[0017] Figure 1 It is a schematic cross-sectional view of a display according to an embodiment aspect of the present utility model.

[0018] Figure 2A three-dimensional schematic diagram of a strip-shaped micro-prism layer in a contrast enhancement film of a display according to an embodiment of the present utility model.

[0019] Figure 3 A cross-sectional schematic diagram of a strip-shaped micro-prism layer of a contrast enhancement film of a display according to an embodiment of the present utility model. Detailed implementation manners

[0020] First, please refer to Figure 1 and Figure 2 . Figure 1 A cross-sectional schematic diagram showing the display 100 of the present utility model is illustrated. Figure 2 A three-dimensional schematic diagram showing the strip-shaped micro-prism layer 122 in the contrast enhancement film 120 of the display 100 of the present utility model is illustrated. The display 100 of the present utility model includes: a backlight module 110, a contrast enhancement film 120, a first polarizer 130, a liquid crystal display module 140, and a second polarizer 150. Among them, the contrast enhancement film 120 is disposed on the light incident side of the first polarizer 130. The contrast enhancement film 120 includes a substrate 121, a strip-shaped micro-prism layer 122, and a filling layer 123. The strip-shaped micro-prism layer 122 is disposed on the substrate 121. Among them, the strip-shaped micro-prism layer 122 includes a plurality of strip-shaped micro-prisms 1221 extending along a first direction D1 and arranged at intervals. Each of these strip-shaped micro-prisms 1221 has at least one light guiding inclined surface 1221a, and the filling layer 123 fills the gaps between the strip-shaped micro-prisms 1221 of the strip-shaped micro-prism layer 122.

[0021] In the display of the present utility model, the contrast enhancement film 120 is attached to the light incident side of the first polarizer 130 with the substrate 121 adjacent to the strip-shaped micro-prism layer 122.

[0022] As Figure 3 shown, in the contrast enhancement film 120 included in the preferred embodiment of the display 100 of the present utility model, the maximum bottom width W1 of the strip-shaped micro-prisms 1221 of the strip-shaped micro-prism layer 122 is between 0.3 μm and 15.0 μm, and preferably between 3.0 μm and 10.0 μm. The height H1 is between 0.9 μm and 10.0 μm, and preferably between 3.0 μm and 6.0 μm. The bottom interval width W2 between adjacent strip-shaped micro-prisms 1221 is between 0.3 μm and 15.0 μm, and preferably between 3.0 μm and 10.0 μm. Each light guiding inclined surface 1221a of the strip-shaped micro-prisms 1221 forms an angle θ with the normal direction of the film surface of the strip-shaped micro-prism layer 122 in a cross-section perpendicular to the first direction D1. The angle θ is preferably not less than 5° and not greater than 15° to have a substantially linear light guiding effect.

[0023] In a display (not shown) according to another embodiment of the present utility model, the top of the strip-shaped microprism 1221 of the contrast enhancement film 120 is not limited to a flat surface, a sharp angle or an arc, as long as the bright-state picture of the display does not generate a flickering feeling. In a preferred embodiment of the present utility model, the top of the strip-shaped microprism 1221 of the contrast enhancement film 120 is a flat surface.

[0024] In another embodiment of the display (not shown) of the present utility model, the bottom maximum width W1, height H1, bottom spacing width W2 and included angle θ of the strip-shaped microprism 1221 of the contrast enhancement film 120 can be independently set to be all the same or partially the same according to the pixel arrangement, pixel size, overall requirements or product design requirements of different liquid crystal display modules 140. Therefore, the adjacent light guide inclined surfaces 1221a can be symmetric or asymmetric.

[0025] The contrast enhancement film 120 of the present utility model forms a strip-shaped microprism layer 122 and a filling layer 123 with curable resins having different refractive indexes. The first refractive index n1 of the strip-shaped microprism layer 122 is greater than the second refractive index n2 of the filling layer 123. The first refractive index n1 and the second refractive index n2 are between 1.4 and 1.7, and the difference between the first refractive index n1 and the second refractive index n2 is not less than 0.05 and not greater than 0.3.

[0026] In an embodiment of the present utility model, the contrast enhancement film 120 is disposed on the light incident side of the backlight module 110 of the first polarizing plate 130 (or the contrast enhancement film 20 is disposed on the side of the first polarizing plate 130 facing the backlight module 110). And the filling layer 123 is located on the light incident side of the light of the backlight module 110, while the strip-shaped microprism layer 122 is located on the light exit side (or the filling layer 123 is located on the side of the first polarizing plate 130 facing the backlight module 110, and at the same time the strip-shaped microprism layer 122 is located on the side of the filling layer 123 away from the backlight module 110).

[0027] The strip-shaped microprism layer 122 of the contrast enhancement film 120 included in the display 100 of the present utility model can coat a first curable resin with a first refractive index n1 on a substrate 121, and then form a plurality of strip-shaped microprisms 1221 extending in the same direction by imprinting with a mold, an engraving roller, etc. After curing to form the strip-shaped microprism layer 122, a second curable resin with a second refractive index n2 is covered and the surface of the strip-shaped microprism layer 122 is flattened to form a filling layer 123. In the present utility model, the first curable resin and the second curable resin can be photo-curable resins or thermo-curable resins, such as acrylic resins, silicone resins, polyurethane resins, epoxy resins or combinations thereof. In the present utility model, in the embodiments for manufacturing the contrast enhancement film 120, the substrate 121 used can adopt common transparent substrates in this technical field, such as polyethylene terephthalate film (PET), triacetate cellulose film (TAC), polymethyl methacrylate film (PMMA), etc.

[0028] In an embodiment of the present utility model, the substrate 121 can be polyethylene terephthalate with a thickness of 60 μm. On the substrate 121, strip-shaped microprisms 1221 with a bottom maximum width W1 of 7.5 μm, a height H1 of 5.0 μm, a bottom interval width W2 of 3.0 μm and an included angle θ of 15 degrees are formed with a polyacrylic resin with a refractive index of 1.6, and these strip-shaped microprisms 1221 are filled with a polyacrylic resin with a refractive index of 1.47 to form the contrast enhancement film 120, and the contrast enhancement film 120 is attached to the first polarizing plate 130 with the substrate 121 adjacent to the strip-shaped microprism layer 122.

[0029] The display 100 of the present utility model directly attaches the contrast enhancement film 120 to the light incident side of the first polarizing plate 130 with an adhesive layer, where the filling layer 123 side is the light incident side, and then forms the display 100 with a backlight module 110, a liquid crystal display module 140 and a second polarizing plate 150 with the brand model: AUO, VP229DA.

[0030] In a comparative example, the same contrast enhancement film 120 used in the above embodiment is attached to the light emitting side surface of the second polarizing plate 150 with the filling layer 123 side, and then assembled with a backlight module 110, a liquid crystal display module 140, and a first polarizing plate 130 with the brand model: AUO, VP229DA into a display (not shown).

[0031] The display 100 of the above embodiment and the display of the comparative example (not shown) were respectively measured by a panel measuring instrument Autronic Melchers GmbH Mechanics, ConoScope 80 for the maximum brightness in the bright state (L255 gradation) and the minimum brightness in the dark state (L0 gradation) in the front view direction, and the contrast ratio (CR) was obtained from the ratio of the bright and dark states. The measurement results are shown in Table 1.

[0032] The luminance of the display 100 of the embodiment and the display of the comparative example (not shown) at left and right side viewing angles of 20 degrees and 40 degrees respectively was measured by a spectroscopic luminance meter (SR-3A, Topcon), and the light uniformity of the left and right side viewing angles was obtained from their ratio. When the ratio is less than 2.0, it means that the difference between the left and right viewing angles is small and the uniformity is good. The measurement results are shown in Table 1.

[0033] Table 1

[0034]

[0035] It can be clearly seen from Table 1 that the display 100 of the embodiment of the present invention uses the contrast enhancement film 120 on the side of the first polarizing plate 130 adjacent to the backlight module 110. Compared with the comparative example, the general method and structure of setting the contrast enhancement film 120 on the light-emitting side surface of the second polarizing plate 150 can greatly improve the front view contrast ratio, and the uniformity of the left and right side viewing angles is close, without sacrificing the uniformity of the light distribution.

[0036] By the detailed description of the above preferred specific embodiments, it is hoped that the features and spirit of the present invention can be more clearly described, rather than limiting the aspects of the present invention by the above-disclosed preferred specific embodiments. On the contrary, the purpose is to hope to cover various changes and equivalent arrangements within the scope of the patent application of the present invention. Therefore, the aspects of the patent scope of the present invention should be interpreted as widely as possible according to the above description, so as to cover all possible changes and equivalent arrangements.

Claims

1. A display, characterized in that, It sequentially includes a backlight module, a contrast enhancement film, a first polarizer, a liquid crystal display module, and a second polarizer. Among them, the contrast enhancement film is disposed on the light incident side of the first polarizer, and the contrast enhancement film includes a substrate, a strip-shaped microprism layer, and a filling layer. Among them, the strip-shaped microprism layer is disposed on the substrate, and the strip-shaped microprism layer includes a plurality of strip-shaped microprisms extending along a first direction and arranged at intervals, and each of these strip-shaped microprisms has at least one light guiding inclined surface, and the filling layer fills the gaps between the strip-shaped microprisms of the strip-shaped microprism layer.

2. The display according to claim 1, wherein The contrast enhancement film adheres to the light incident side of the first polarizer with the substrate adjacent to the strip-shaped microprism layer.

3. The display according to claim 1, wherein The maximum bottom width of each of the strip-shaped microprisms of the strip-shaped microprism layer is between 0.3 μm and 15.0 μm, the height is between 0.9 μm and 10.0 μm, and the bottom interval width is between 0.3 μm and 15.0 μm.

4. The display according to claim 1, wherein The at least one light guiding inclined surface of each of the strip-shaped microprisms forms an angle θ with the normal direction of the film surface of the strip-shaped microprism layer in a cross-section perpendicular to the first direction, and the angle θ is not less than 5° and not greater than 15°.

5. The display according to claim 1, characterized in that, The tops of the strip-shaped microprisms of the strip-shaped microprism layer are flat, pointed, or arc-shaped.

6. The display according to claim 1, characterized in that, The maximum bottom width of each of the strip-shaped microprisms of the strip-shaped microprism layer is between 3.0 μm and 10.0 μm, the height is between 3.0 μm and 6.0 μm, and the bottom interval width is between 3.0 μm and 10.0 μm.

7. The display according to claim 1, characterized in that, The filling layer is located on the light incident side of the first polarizer facing the light of the backlight module, while the strip-shaped microprism layer is located on the light output side of the filling layer facing away from the light of the backlight module.

8. The display according to claim 1, characterized in that, The maximum bottom widths of each of the strip-shaped microprisms of the strip-shaped microprism layer are the same or partially the same.

9. The display according to claim 1, characterized in that, The heights of each of the strip-shaped microprisms of the strip-shaped microprism layer are the same or partially the same.

10. The display according to claim 1, wherein The bottom interval widths of each of the strip-shaped microprisms of the strip-shaped microprism layer are the same or partially the same.

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