CN201166306Y - Diffusion sheet with light-gathering function - Google Patents

Abstract

A diffusion sheet with light-gathering function is provided, wherein one side of a substrate is provided with a plurality of prism columns; at least one inclined plane of part of the prism columns is provided with an uneven diffusion surface; the diffusion surface can be arranged at any position of the inclined surface of the prism; the diffusion surface is provided with a plurality of irregularly arranged concave-convex stripes, and the direction of the irregularly arranged concave-convex stripes can be vertical, non-vertical or parallel to the edge lines of the prism columns; the diffusion surface can effectively reduce the dispersion phenomenon of light and the stripes of the atomized prism columns, reduce the probability of generating overlapped stripes and increase the production yield.

Description

Diffuser with light-gathering function

technical field

The utility model relates to an optical film, in particular to an optical film with a plurality of prism column structures required for a liquid crystal display (LCD, Liquid Crystal Display) backlight system or other electronic devices.

Background technique

Please refer to Figure 1. The backlight system of a general liquid crystal display includes a cold cathode lamp (CCFL) 11, a light guide plate (LGP) 12, a bottom diffuser (Bottom diffuser) 13, a light concentrating sheet (Prismsheet) 14, an upper diffuser (Top diffuser) 15 and Reflector (Reflector) 16 is formed.

Please refer to Figure 2. It is known that the condensing sheet 14 is composed of a plurality of prism rods (Prism rod) 141 and a substrate (Substrate) 142 arranged in parallel longitudinally and having a triangular cross-section. The prism column 141 is combined with one side of the substrate 142 . The height and width of each prism column 141 are the same, and the height of the peak (Peak) of the prism column 141 is constant, the trend is a straight line, and the slopes on both sides of the peak are symmetrical. It is known that the condensing sheet 14 has a surface structure composed of a plurality of regular prism columns 141 .

Please refer to Figure 3. There are three optical path modes of the light-condensing sheet 14:

1. Total reflection recovery (TRI Recycle):

When the light 143 enters within ±4° of the virtual vertical axis 140 of the bottom surface of the vertical prism column 141 in the prism column, it is affected by the total reflection phenomenon of the slope of the prism column 141. After two total reflections, it is recycled to the back The direction of the light source, continue to spread and spread;

2. Second Reflection Recycle (2 nd Reflection Recycle):

After the light 144 is refracted by the two prism columns 141, it is recycled to the direction of the back light source, and continues to diffuse and spread for use; and

3. Directed Reflective:

The light 145 is refracted through the inclined surface of the prism column 141, and this light path mode has the effect of concentrating the light; as shown in FIG.

When an upper layer material film such as an upper diffusion sheet 15 or another light-condensing sheet is stacked on the light-condensing sheet 14, light dispersion and moiré are likely to occur. In addition, the side of the condensing sheet 14 having a plurality of parallel prism columns is relatively smooth, and if there is a defect, it is easier to be found and considered as a defective product.

There are many kinds of concentrating sheets with light diffusion layers, such as the Prism sheet disclosed in U.S. Patent No. 5,844,720, which has a plurality of triangular prism columns vertically arranged in parallel on one side, and has a rough surface on the other side. Avoid interference fringes when refracting light, prevent scratches, and make the brightness of the refracted light-condensing sheet uniform, which is conducive to the use of liquid crystal displays. Another example is the concentrating sheet disclosed in Taiwan Patent No. M293442, which includes a base material, and one side of the base material includes a light-diffusing layer with a concave or convex rough structure, wherein the light-diffusing layer has 5%-90% Diffusion.

Most of the above-mentioned light-concentrating sheets with a light-diffusing layer require the finished light-condensing sheet to be further processed to make a rough surface layer at the bottom, which is labor-intensive. In addition, the side of the condensing sheet having a plurality of parallel prism columns is relatively smooth, and if there is a defect, it is easier to be found and considered as a defective product.

The applicant's Taiwan Patent Application No. 95133798 disclosed by the applicant has a strip-shaped rough diffusion surface between two adjacent prism columns, and utilizes the diffusion surface between the two prism columns. The diffused light mixes with the light emitted by the prism column, which can effectively reduce the dispersion of light and the stripes of the atomized prism column, reduce the chance of moiré, and increase the production yield of the condensing sheet; The longitudinally arranged elongated prism columns and the elongated rough diffusing surface can be integrally formed, so it is easier to manufacture.

The applicant has applied for the Chinese Taiwan Patent Application No. 96108016 to disclose the diffused light-concentrating sheet, which has uneven rough parts on the top and/or both sides of the peaks of its multiple prism columns, so as to reduce the diffusion and light-concentrating When the sheet is stacked with other material films, the phenomenon of sticking, light dispersion and moiré occurs.

However, it is difficult to integrally form the above-mentioned base material, a plurality of longitudinally arranged elongated prism columns, and an elongated rough diffuser surface. Usually, the rough diffuser surface is formed by forming prism columns, and then sandblasted surface is used. Two kinds of processes are required to deal with the formation of the process, which takes more time and cost for manufacturing.

Utility model content

In order to make the light-gathering diffuser have a new structure and be easier to manufacture, the utility model is proposed.

The main purpose of the present invention is to provide a diffuser with a light-gathering function, which is easier to manufacture and saves manufacturing costs, and can reduce light dispersion when the diffuser is stacked with other material films.

Another object of the present invention is to provide a diffuser with a light-gathering function, which can atomize the stripes of the prism columns, which is helpful to increase the production yield of the diffuser and cover the defects of the backlight module.

Another object of the present invention is to provide a diffuser with a light-gathering function, which can reduce moiré when the diffuser is stacked with other material films.

The utility model provides a light-gathering diffuser, which is characterized in that it comprises a base material and a plurality of elongated prism columns arranged longitudinally; one surface of the base material is provided with the plurality of prism columns; Each prism column has a ridgeline, a first slope, and a second slope; the ridgeline is placed at the highest position of the prism column; the first slope and the second slope extend from both sides of the ridgeline to the substrate; At least one of the first slope and the second slope of some of the plurality of prism columns is provided with an uneven diffusion surface; the diffusion surface is provided with a plurality of irregularly arranged concave-convex stripes.

Wherein the width of the diffusion surface accounts for between 2% and 90% of the width of the slope.

Wherein the direction of the plurality of concave-convex stripes is perpendicular to the ridgeline.

Wherein the direction of the plurality of concave-convex stripes is parallel to the ridgeline.

Wherein the direction of the plurality of concave-convex stripes is perpendicular to the ridgeline.

Wherein the direction of the plurality of concave-convex stripes is parallel to the ridgeline.

Wherein the diffusion surface is close to the substrate.

Wherein the diffusion surface is close to the ridgeline.

Wherein the diffusion surface is close to the substrate.

Wherein the diffusion surface is close to the ridgeline.

Wherein the width of the diffusion surface is a random number variation.

Wherein the width of the diffusion surface changes regularly.

The beneficial effects of the utility model are:

The diffuser with light-gathering function of the utility model is easier to manufacture and can save manufacturing costs, and can reduce the phenomenon of light dispersion when the diffuser is stacked with other material films, which helps to increase the production yield and shielding of the diffuser The defects of the backlight module can reduce the occurrence of moiré when the diffusion sheet is stacked with other material films.

Description of drawings

For other purposes, effects and specific embodiments of the present utility model, please refer to the accompanying drawings and embodiments, detailed descriptions are as follows, wherein:

FIG. 1 is a schematic diagram of a backlight system of a known display.

Fig. 2 is a schematic diagram of a known light collecting sheet.

FIG. 3 is a schematic diagram of various light refraction modes of a known condensing sheet.

FIG. 4 is a schematic diagram of the diffuser of the first embodiment of the present invention.

Fig. 5 is a schematic side view of the diffuser of the first embodiment of the present invention.

FIG. 6 is a schematic diagram of light diffused by the diffuser sheet according to the first embodiment of the present invention.

FIG. 7 is a schematic diagram of a diffusion sheet according to a second embodiment of the present invention.

FIG. 8 is a schematic diagram of a diffusion sheet according to a third embodiment of the present invention.

FIG. 9 is a schematic diagram of a diffusion sheet according to a fourth embodiment of the present invention.

Explanation of main component symbols

11…Cold cathode lamp

12...Light guide plate

13…Lower diffuser

14…Concentrator

140...Vertical axis

141…prism column

142…Substrate

143, 144, 145, 31, 32… rays

15…Upper diffuser

16...reflector

20, 30, 40, 50...diffusers

21, 31, 41, 51... Substrate

22, 32, 42, 52...prism column

221, 321, 421, 521... Ridges

222, 322, 422, 522...the first slope

223, 323, 423, 523...second slope

224, 324, 424, 524...diffusion surface

225, 325, 425, 525...Concave-convex stripes

Detailed ways

Please refer to Figure 4, Figure 5, and Figure 6. The utility model has a light-gathering function of a diffuser, which is used to reduce the light dispersion phenomenon of the prism column and the probability of moiré, and helps to improve the production yield. The diffusion sheet 20 of the first embodiment of the present utility model includes: a base material 21, which can allow light to pass through; a surface of the base material 21 is provided with a plurality of longitudinally arranged elongated prism columns 22; each prism column 22 respectively has a ridgeline 221, a first slope 222 and a second slope 223; the ridgeline 221 is placed at the highest position of the prism column 22; the first slope 222 and the second slope 223 respectively extend from both sides of the ridgeline 221 to the substrate 21 The first slope 222 and/or the second slope 223 of part of the prism column 22 is provided with a rough diffusion surface 224 near the bottom end of the substrate 21; the diffusion surface 224 is provided with a plurality of irregularly arranged concave-convex stripes 225; The direction of the concave-convex stripes 225 is perpendicular to the ridge line 221 . As shown in FIG. 5 , the width a of the diffusing surface 224 is about 2% to 90% of the width b of the first slope 222 or the second slope 223 . The diffusion sheet 20 only needs one process, and the diffusion surface 224 is formed at the same time as the prism column 22 is formed, which can save manufacturing time and cost.

In the diffusion sheet 20 of the present invention, the light 31 diffused by the diffusion surface 224 mixes the light 32 emitted by the prism column 22, as shown in Figure 6, which can effectively reduce the dispersion phenomenon of light and the stripes of the atomized prism column 22, and reduce Moiré occurs; and because the prism column 22 has a strip-shaped rough diffusion surface 224, the overall appearance of the diffusion sheet 20 does not present a complete smooth surface, even if the first slope 222 and/or the second slope 223 have other defects. It is not easy to be found and considered as a defective product, so the production yield of the diffusing and concentrating sheet 20 can be increased.

Please refer to Figure 7. The diffuser 30 of the second embodiment of the present invention also includes a base material 31 and a plurality of prism columns 32 . The prism column 32 has a ridgeline 321 , a first slope 322 and a second slope 323 . However, the upper end of the first slope 322 and/or the second slope 323 of the plurality of prism columns 32 near the ridge line 321 is provided with a rough diffusion surface 324; the diffusion surface 324 is provided with a plurality of irregularly arranged concave-convex stripes 325; The direction of the concave-convex stripes 325 is perpendicular to the ridgeline 321 . The width of the diffusing surface 324 is about 2% to 90% of the width of the first slope 322 or the second slope 323 . The diffusion sheet 30 only needs one process, and the diffusion surface 324 is formed at the same time as the prism column 32 , which saves manufacturing time and cost, and has other functions of the above-mentioned diffusion sheet 20 .

Please refer to Figure 8. The diffuser 40 of the third embodiment of the present invention also includes a base material 41 and a plurality of prism columns 42 . The prism column 42 has a ridgeline 421 , a first slope 422 and a second slope 423 . The first slope 422 and/or the second slope 423 of a plurality of prism columns 42 are provided with a rough diffusion surface 424 near the lower end of the substrate 41; the diffusion surface 424 is provided with a plurality of irregularly arranged concave-convex stripes 425; but multiple The direction of the concave-convex stripes 425 is parallel to the ridgeline 421 . The width of the diffusion surface 424 accounts for about 2% to 90% of the width of the first slope 422 or the second slope 423 . The diffusion sheet 40 only needs one process, and the diffusion surface 424 is formed at the same time as the prism column 42 , which saves manufacturing time and cost, and has other functions of the above-mentioned diffusion sheet 20 .

Please refer to Figure 9. The diffuser 50 of the fourth embodiment of the present invention also includes a base material 51 and a plurality of prism columns 52 . The prism column 52 has a ridgeline 521 , a first slope 522 and a second slope 523 . However, the upper end of the first slope 522 and/or the second slope 523 of the plurality of prism columns 52 near the ridge line 521 is provided with a rough diffusion surface 524; the diffusion surface 524 is provided with a plurality of irregularly arranged concave-convex stripes 525; The direction of the concave-convex stripes 525 is parallel to the ridgeline 521 . The width of the diffusing surface 524 accounts for about 2% to 90% of the width of the first slope 522 or the second slope 523 . The diffusion sheet 50 only needs one process, and the diffusion surface 524 is formed at the same time as the prism column 52 , which saves manufacturing time and cost, and has other functions of the above-mentioned diffusion sheet 20 .

The diffusion sheet of the utility model is provided with uneven diffusion surfaces on the slopes of a plurality of prism columns; the width of the diffusion surfaces accounts for 2% to 90% of the width of the slopes of the prism columns. The slope of the prism column can be provided with a diffusion surface on both sides or only one side has a diffusion surface. The diffusion surface can be at any position on the slope of the prism, and the diffusion surface is provided with a plurality of irregularly arranged concave-convex stripes. The width of the diffusion surface can be a random number or a regular change. The diffusion sheet of the utility model can effectively reduce the dispersion phenomenon of light and the stripes of the atomized prism column by using the diffusion surface, reduce the chance of moiré, and increase the production yield. And the single diffusion sheet of the present utility model can replace the condensing sheet 14 and the upper diffusion sheet 15 shown in FIG. 1 to achieve the effect of combining the two membranes. In addition, the thickness of the backlight module can be reduced, and the cost expenditure can be reduced.

The diffuser of the utility model can achieve the following effects:

1. It can save manufacturing time and cost;

2. It can effectively reduce the light dispersion phenomenon of the prism column;

3. Atomize the stripes of the prism column to reduce the chance of moiré;

4. The stripes of the atomized prism column help to increase the production yield; and

5. Atomize the stripes of the prism column to cover the defects of the backlight module.

What is described above is only an embodiment utilizing the technical content of the present utility model. Any modifications and changes made by those skilled in the art using the utility model are all within the scope of the claims of the utility model, and are not limited to The content disclosed in the embodiment.

Claims (12)

1, a kind of diffusion sheet of tool light-focusing function is characterized in that, comprises a base material and a plurality of prism columns of vertically arranging strip; One surface of this base material is provided with this a plurality of prism columns; These a plurality of prism columns have crest line, first inclined-plane and second inclined-plane respectively; This crest line places the extreme higher position of this prism columns; This first inclined-plane, this second inclined-plane extend to this substrate by the both sides of this crest line respectively; Have at least an inclined-plane to be provided with rough diffusingsurface in this first inclined-plane of these a plurality of prism columns of part and this second inclined-plane; This diffusingsurface is provided with the concave and convex stripe of a plurality of irregular alignments.

2, the diffusion sheet of tool light-focusing function as claimed in claim 1 is characterized in that, wherein the width of this diffusingsurface account for this inclined-plane width 2% to 90% between.

3, the diffusion sheet of tool light-focusing function as claimed in claim 1 is characterized in that, wherein the trend of these a plurality of concave and convex stripes is perpendicular to this crest line.

4, the diffusion sheet of tool light-focusing function as claimed in claim 1 is characterized in that, wherein the trend of these a plurality of concave and convex stripes is parallel to this crest line.

5, the diffusion sheet of tool light-focusing function as claimed in claim 2 is characterized in that, wherein the trend of these a plurality of concave and convex stripes is perpendicular to this crest line.

6, the diffusion sheet of tool light-focusing function as claimed in claim 2 is characterized in that, wherein the trend of these a plurality of concave and convex stripes is parallel to this crest line.

7, the diffusion sheet of tool light-focusing function as claimed in claim 5 is characterized in that, wherein this diffusingsurface is near this base material.

8, the diffusion sheet of tool light-focusing function as claimed in claim 5 is characterized in that, wherein this diffusingsurface is near this crest line.

9, the diffusion sheet of tool light-focusing function as claimed in claim 6 is characterized in that, wherein this diffusingsurface is near this base material.

10, the diffusion sheet of tool light-focusing function as claimed in claim 6 is characterized in that, wherein this diffusingsurface is near this crest line.

As the diffusion sheet of each described tool light-focusing function in the claim 1 to 10, it is characterized in that 11, wherein the width of this diffusingsurface is that random number changes.

As the diffusion sheet of each described tool light-focusing function in the claim 1 to 10, it is characterized in that 12, wherein the width of this diffusingsurface is that rule changes.

Images