TWI451138B - Prism sheet and liquid crystal display device using the same - Google Patents

Description

Bract and liquid crystal display device using the same

The present invention relates to a cymbal sheet and a liquid crystal display device using the same.

Since the liquid crystal of the panel of the liquid crystal display device itself does not have the illuminating property, in order to achieve the display effect, the liquid crystal display device panel needs to provide a light source device, such as a backlight module. The function of the backlight module is to supply a surface light source with sufficient brightness and uniform distribution to the liquid crystal display device panel.

Referring to FIG. 1 and FIG. 2 , a conventional liquid crystal display device 10 includes a backlight module 11 and a liquid crystal panel 12 disposed above the backlight module 11 . The backlight module 11 includes a reflector 111 and a plurality of light sources 112, a diffusion plate 113 and a cymbal 114 disposed in sequence above the reflector 111. The diffusion plate 113 generally contains methyl methacrylate particles as diffusion particles for diffusing light. The slab 114 includes a transparent substrate 1141. The strip-shaped V-shaped protrusions 1142 extending in a plurality of straight lines are used to increase the brightness of the backlight module 11 within a specific viewing angle range. In use, after the light generated by the complex light source 112 is uniformly diffused into the diffusion plate 113, it continues to enter the cymbal 114. Under the action of the plurality of elongated V-shaped protrusions 1142 of the cymbal 114, the emitted light is concentrated to some extent. Then, it is emitted by the liquid crystal panel 12 and then emitted.

However, since the interval between the cymbal sheet 114 and the liquid crystal panel 12 is small, when the direction in which the elongated V-shaped protrusions 1141 on the cymbal sheet 114 extend is parallel to the arrangement direction of the array of pixels in the liquid crystal panel 12, it is easy. A diffraction streak is generated on the liquid crystal panel 12, thereby affecting the display quality of the liquid crystal display device 10. Therefore, it is necessary to improve the structure of the cymbal sheet 114 to prevent generation of diffraction fringes on the liquid crystal panel 10.

Referring to FIG. 3, a conventional cymbal 20 includes a transparent substrate 201. The upper surface of the transparent substrate 201 is formed with a plurality of elongated V-shaped protrusions 202 extending in an irregular path. When the cymbal sheet 201 is used in a liquid crystal display device, since the long V-shaped protrusions 202 on the surface thereof are curved and extended along an irregular path, the extending direction of the plurality of elongated V-shaped protrusions 202 does not extend into the liquid crystal panel. The array of pixels is arranged in parallel, so that the generation of diffraction fringes can be effectively prevented.

However, the manufacturing process of the processing die for manufacturing the cymbal sheet 20 is complicated, because the surface of the processing die needs to be bent according to the irregular path of the surface of the cymbal 20, and the corresponding curved extension is made. a strip-shaped V-shaped groove, and the curvature of the V-shaped groove is constantly changing, and the tool for processing the V-shaped groove needs to process different curvature segments of the V-shaped groove separately, that is, The tool is rotated at different radii around different central axes during the machining process, which results in a longer manufacturing time and high cost of the processing die, and is easy to cause the surface of the V-shaped groove to be combined with different curvature segments. smooth. Therefore, the cymbal sheet 20 produced by using such a mold has a long development cycle, high manufacturing cost, and a low surface flatness of the long strip-shaped V-shaped projection thereon.

In view of the above, it is necessary to provide a chip which is easy to manufacture and which does not cause diffraction streaks on the corresponding liquid crystal panel, and a liquid crystal display device using the same.

A cymbal sheet comprising a transparent substrate, a surface of one of the transparent substrates is formed with a plurality of elongated V-shaped protrusions extending in a curved shape, and the plurality of elongated V-shaped protrusions are respectively parallel to each other along an equal curvature arc Line extension.

A liquid crystal display device includes a backlight module and a liquid crystal panel disposed opposite to the backlight module. The backlight module includes a reflector and a plurality of light sources, a diffusion plate and a die disposed above the reflector The cymbal includes a transparent substrate, and a surface of one of the transparent substrates is formed with a plurality of curved V-shaped protrusions extending in a plurality of curved directions, and the plurality of elongated V-shaped protrusions are respectively parallel along the plurality of equal curvature circular lines extend.

Compared with the prior art, the plurality of long V-shaped protrusions on the cymbal are respectively extended along the parallel arc lines of equal curvature, so that when the conventional mold is used for processing, only the surface of the mold needs to be processed. The equal-curve arc-shaped V-shaped groove may be parallel to each other. Since the plurality of arc-shaped V-shaped grooves have the same curvature, the tool for processing the arc-shaped V-shaped groove only needs to be along the surface of the mold. A plurality of predetermined arc lines are moved to form a plurality of arc-shaped V-shaped grooves, and in the process, the tool only needs to rotate at the same radius corresponding to the central axis of the complex number on the same straight line. Therefore, the processing die of the cymbal sheet of the invention is easy to manufacture and has low cost, so that the manufacturing cost of the cymbal sheet is correspondingly low, and since each V-shaped groove of the surface of the mold is formed at one time, the V-shaped groove can be formed. A preferred surface flatness is obtained such that the elongated V-shaped projections on the cymbal provide a corresponding surface flatness. In addition, the long V-shaped protrusion of the cymbal is curved and extended on the surface of the transparent substrate. Therefore, when the cymbal is applied to the liquid crystal display device, the extending direction of the plurality of elongated V-shaped protrusions does not extend into the liquid crystal panel. The array of pixels is arranged in parallel, so that the generation of diffraction fringes can be effectively prevented.

The cymbal sheet of the present invention and the liquid crystal display device using the same will be further described in detail below with reference to the accompanying drawings and embodiments.

Please refer to FIG. 4 , which shows a cymbal sheet 30 according to a preferred embodiment of the present invention, which includes a transparent substrate 31 having a light incident surface 311 and a light exit surface 312 opposite to the light incident surface 311. A plurality of elongated V-shaped projections 32 extending in a plurality of curved shapes are formed on the light-emitting surface 312, and the plurality of elongated V-shaped projections 32 extend along a plurality of equal curvature circular arcs parallel to each other. Both sides of the elongated V-shaped projection 32 are mirror-shaped, and the distance between the centers of the adjacent two elongated V-shaped projections 32 is preferably 0.025 mm to 1 mm. The apex angle θ of the elongated V-shaped protrusions 32 is preferably 60 degrees to 120 degrees. In use, the long strip-shaped V-shaped protrusions 32 having different apex angles θ can make the backlight module have different brightness and Perspective.

The thickness of the crotch panel 30 can be from 0.5 mm to 3 mm. The cymbal sheet 30 is injection molded from at least one of an acrylic resin, a polycarbonate resin, a polystyrene resin, and a styrene-methyl methacrylate resin. During the preparation process, a V-shaped groove corresponding to the elongated V-shaped projection 32 is provided on the processing die so that the cymbal sheet 30 can be formed in a single injection molding process.

Since the plurality of long V-shaped protrusions on the cymbal sheet 30 respectively extend along a plurality of equal curvature circular arc lines parallel to each other, when the conventional mold is used for processing, only a plurality of parallel parallels are required to be processed on the surface of the mold. The arcuate V-shaped groove of equal curvature may be, since the plurality of arc-shaped V-shaped grooves have the same curvature, the tool for processing the arc-shaped V-shaped groove only needs to follow a predetermined plurality of arcs on the surface of the mold. The line moves to form a plurality of arc-shaped V-shaped grooves, and in the process, the tool only needs to rotate at the same radius corresponding to the central axis of the complex line on the same straight line. Therefore, the processing die of the cymbal sheet 30 of the present invention is easy to manufacture and low in cost, so that the manufacturing cost of the cymbal sheet 30 is correspondingly low, and since each V-shaped groove of the surface of the mold is formed at one time, the V The groove can achieve a better surface flatness, so that the long V-shaped projection 32 on the cymbal 30 correspondingly achieves a better surface flatness, that is, the two sides of the elongated V-shaped projection 32 are Mirror surface.

In addition, the cymbal sheet 30 of the present invention is integrally molded by injection molding, and the conventional enamel sheet is formed by coating a resin film on a transparent plate to form a microstructure, and the cymbal sheet 30 is easier to achieve a faster amount than the two. Production and cost reduction; and when used, there is no light interface loss in the cymbal 30, which has higher light utilization. In addition, the conventional method is to apply a resin film on a transparent substrate to form a plurality of elongated V-shaped protrusions, and the bonding force between the coated resin film and the transparent substrate is generally low and the resin film itself is difficult to form high strength, so it is easy to cause The long V-shaped projection is scratched and pressure-damped; and the cymbal 30 formed by injection molding has a long V-shaped projection 32 formed thereon and a transparent substrate 31 together, which can make a long strip V The high degree of structural strength between the shaped projections 32 and the transparent substrate 31 avoids or reduces the risk of the elongated V-shaped projections 32 being damaged during use.

Referring to FIG. 5, a liquid crystal display device 50 according to a second embodiment of the present invention includes a backlight module 51 and a liquid crystal panel 52 disposed above the backlight module 51. The backlight module 51 includes a reflection. a plate 511 and a plurality of light sources 512, a diffusion plate 513 and a die 30 disposed above the reflector 511, the diffusion plate 513 is configured to diffuse light, and the die 30 is used to increase a specific viewing angle range of the backlight module. The brightness inside.

Since the plurality of strip-shaped V-shaped protrusions 32 of the cymbal sheet 30 are curved and extended on the light-emitting surface 312 of the transparent substrate 31, the extending direction of the plurality of elongated V-shaped protrusions 32 does not overlap with the pixels in the liquid crystal panel 52. The arrangement of the arrays is parallel, so that the generation of diffraction fringes can be effectively prevented.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

(this invention)

Bracts. . . 30

Transparent substrate. . . 31

Into the light side. . . 311

Light surface. . . 312

Long strip V-shaped bumps. . . 32

Liquid crystal display device. . . 50

Backlight module. . . 51

Reflective plate. . . 511

light source. . . 512

Diffuser plate. . . 513

LCD panel. . . 52

(known)

Liquid crystal display device. . . 10, 20

Backlight module. . . 11

Reflective plate. . . 111

light source. . . 112

Diffuser plate. . . 113

Bracts. . . 114

Transparent substrate. . . 1141

Long strip V-shaped bumps. . . 1142, 202

Transparent substrate. . . 201

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic cross-sectional view showing a liquid crystal display device using a conventional chip.

Figure 2 is a perspective view of the cymbal shown in Figure 1.

Figure 3 is a perspective view of another conventional bract.

Figure 4 is a perspective view of a cymbal according to a preferred embodiment of the present invention.

Figure 5 is a cross-sectional view showing a liquid crystal display device of a second preferred embodiment of the present invention.

Bracts. . . 30

Transparent substrate. . . 31

Into the light side. . . 311

Light surface. . . 312

Long strip V-shaped bumps. . . 32

Claims (11)

A cymbal sheet comprising a transparent substrate, a surface of one of the transparent substrates is formed with a plurality of curved V-shaped protrusions, and the improvement is that the plurality of long V-shaped protrusions are parallel to each other The curvature arc line extends. The cymbal according to claim 1, wherein the distance between the centers of the adjacent elongated V-shaped projections is 0.025 mm to 1 mm. The cymbal according to claim 1, wherein the apex angle of the elongated V-shaped projection is 60 degrees to 120 degrees. The cymbal of claim 1, wherein the two sides of the elongated V-shaped projection are mirror surfaces. The ruthenium according to item 1 of the patent application has a thickness of 0.5 mm to 3 mm. The ruthenium according to the first aspect of the patent application, which is formed by injection molding at least one of an acrylic resin, a polycarbonate resin, a polystyrene resin and a styrene-methyl methacrylate resin. A liquid crystal display device includes a backlight module and a liquid crystal panel disposed above the backlight module. The backlight module includes a reflector and a plurality of light sources, a diffusion plate and an edge sequentially disposed above the reflector The lens comprises a transparent substrate, and a surface of one of the transparent substrates is formed with a plurality of curved V-shaped protrusions, and the improvement is that the plurality of elongated V-shaped protrusions are parallel to each other The curvature arc line extends. The liquid crystal display device of claim 7, wherein the distance between the centers of the adjacent elongated V-shaped protrusions is 0.025 mm to 1 mm. The liquid crystal display device of claim 7, wherein the elongated V-shaped projection has an apex angle of 60 to 120 degrees. The liquid crystal display device of claim 7, wherein the two sides of the elongated V-shaped projection are mirror surfaces. The liquid crystal display device of claim 7, wherein the ruthenium has a thickness of 0.5 mm to 3 mm.