CN101021576A - Optics that improve light flare - Google Patents

Abstract

An optical element capable of improving the phenomenon of light glow is provided with a light inlet surface and a light outlet surface, light can pass through the optical element from the light inlet surface to the light outlet surface, the optical element comprises at least one microstructure layer arranged on one surface of the light inlet surface or the light outlet surface, the at least one microstructure layer is provided with a plurality of separated micro areas and at least one complete micro area, the complete micro area is larger than each separated micro area, and the separated micro areas and the complete micro areas are matched to form a preset pattern for changing the light transmittance of the optical element so as to improve the phenomenon of light glow. The microstructure layer can also reflect part of the light back to the original light path for reuse, so as to improve the overall luminous efficiency of the optical element.

Description

Optics that improve light flare

【Technical field】

The present invention relates to an optical element such as a light-diffusing film, a diffusing plate, a condensing sheet, etc., and particularly relates to an optical element that can improve the phenomenon of light rays (bright and dark bands).

【Background technique】

As shown in the prior art in Figure 1, the light diffusion sheet 1 has a transparent substrate 2, a diffusion layer 2a arranged on one surface of the substrate 2, and an antistatic layer 2b arranged on the other surface of the substrate 2. The antistatic layer 2b enters from the opposite surface (light-incident surface) facing the surface of the substrate 2, passes through the substrate 2, and then exits from the opposite surface (light-emitting surface) of the diffusion layer 2a facing the surface of the substrate 2, and passes through the light-diffusing sheet 1 The light rays are uniformly scattered due to the structure of the diffusion layer 2a.

When the light diffusion sheet 1 is applied to the backlight module, due to the actual design and structural application requirements of the backlight module, the light will interfere, and the light uniformity of the light output surface of the light diffusion sheet 1 is not completely consistent, resulting in light and dark. Banding (bright lines), especially in edge-lit backlight modules used for small-size liquid crystal displays, is the most serious. However, there is no related technology to overcome this problem at present.

Also as shown in Figure 2, a strip-shaped black masking layer 2c is printed on the ineffective light-emitting area at the edge of the diffusion layer 2a (or antistatic layer 2b) of the light diffusion sheet 3 to cover or reduce light leakage and light and dark bands at the edge of the backlight module . However, this method cannot improve the bright and dark bands that occur in the effective light-emitting area, and it only has a shielding function, which cannot control the light passing through, nor can it reflect the light back to the original light path for reuse, which reduces the overall luminous efficiency.

【Content of invention】

The main purpose of the present invention is to provide an optical element that can improve the light glow phenomenon. At least one optical element is arranged on the upper or lower surface of any area (visible area and invisible area) where the optical element presents uneven light and shade (glow line). The microstructure layer attenuates the luminous flux passing through the microstructure layer, so as to achieve the improvement function of reducing or eliminating the unevenness of light and shade (bright lines). and other optical components.

Another object of the present invention is to provide an optical element that can improve the phenomenon of light rays, so that the microstructure layer disposed on the optical element can reflect part of the light back to the original light path for reuse, which can improve the overall luminous efficiency of the optical element .

Another object of the present invention is to provide an optical element that can improve the phenomenon of light rays. The microstructure layer arranged on the optical element has light transmission. When the light passes through the microstructure layer, it will produce a diffusion phenomenon, and then Make the luminescence of this area more uniform in all viewing angles.

The optical element capable of improving the ray phenomenon of light of the present invention has a light incident surface and a light exit surface, allowing light to pass through the optical element through the light incident surface to the light exit surface, and is characterized in that: the optical element comprises:

At least one microstructure layer is arranged on one side of the light incident surface or the light exit surface, the at least one microstructure layer has a plurality of separated microregions and at least one complete microregion, and the complete microregion is larger than each separated microregion regions, the separate micro-regions cooperate with the complete micro-regions to form a predetermined pattern.

According to one aspect of the present invention, an optical element capable of improving light rays has a light incident surface and a light exit surface, allowing light to pass through the optical element through the light incident surface to the light exit surface, and the optical element includes at least A microstructure layer, arranged on one side of the light incident surface or the light exit surface, the at least one microstructure layer has a plurality of separated microregions and at least one complete microregion, and the complete microregion is larger than each separated microregion The separated micro-region cooperates with the complete micro-region to form a predetermined pattern, which is used to change the light transmittance of the optical element, so as to improve the light glow phenomenon.

The optical element of the present invention that can improve the phenomenon of light rays has a microstructure that can shield, reflect, and diffuse light, and is especially suitable for optical devices such as backlight modules that use LEDs as light sources. Bright and dark bands (bright lines) caused by uneven brightness.

【Description of drawings】

Fig. 1 is the schematic structural diagram of conventional light diffusion sheet;

Fig. 2 is a schematic structural diagram of a conventional light diffusion sheet with an edge shielding layer;

FIG. 3A is a schematic structure diagram of a light diffusion sheet capable of improving the phenomenon of light rays according to the first embodiment of the present invention; FIG. 3B is a partial enlarged view of FIG. 3A .

FIG. 4A is a schematic structure diagram of a light diffusion sheet capable of improving the light glow phenomenon according to a second embodiment of the present invention. FIG. 4B is a partially enlarged view of FIG. 4A.

【Detailed ways】

In order to make the above-mentioned purposes, functional features, and advantages of the present invention more clearly understood, the present invention will be described in detail below with preferred examples and accompanying drawings;

Please refer to FIGS. 3A and 3B , the light diffusion sheet 4 that can improve the light glow phenomenon according to the first embodiment of the present invention includes a substrate 2, a diffusion layer 2a disposed on one surface of the substrate 2, and another layer on the substrate 2. An antistatic layer 2b disposed on one surface, a microstructure layer 2d disposed on the opposite surface (light incident surface) of the antistatic layer 2b facing the surface of the substrate 2, or the microstructure layer 2d may be disposed on the diffusion layer 2a facing the substrate 2 The opposite side of the surface (light-emitting surface).

The microstructure layer 2d is set according to the region where the actual glow line occurs, it has a plurality of opaque or partially transparent micro-regions 2e separated, and has a complete opaque or partially transparent micro-region 2f, a plurality of separated micro-regions 2e are arranged in multiple rows from bottom to top, and the shape of each separated microregion 2e is circular and the same size. The spacing changes gradually from bottom to top, and the complete micro-region 2f is located between two columns of separated micro-regions 2e and is designed to be larger than each separated micro-region 2e, so the complete micro-region 2f is separated from a plurality of separated micro-regions 2e Cooperate to form a specific pattern of density changes.

Fig. 3A, 3B illustrate that a complete micro-region 2f cooperates with a plurality of separate micro-regions 2e, but according to actual needs, two or more complete micro-regions can be used, and the shape and size of each complete micro-region Or the spacing between adjacent separated micro-regions can be changed to form various specific patterns with varying densities.

Therefore, by changing the density of the arrangement of the separated micro-regions 2e and complete micro-regions 2f in the microstructure layer 2d, the microstructure layer 2d has a set light transmittance, which can change the amount of light passing through, making the region The light transmittance is changed to control the light distribution in the glow line area, so as to achieve the improvement purpose of reducing or eliminating the glow line. In addition, the same purpose can also be achieved by changing the transparency of the separated micro-regions 2e and the complete micro-regions 2f, or changing their density and transparency at the same time.

The separate micro-regions 2e and the complete micro-regions 2f can be formed by dot printing using opaque or partially transparent UV-resistant ink, or by using semi-transparent materials including but not limited to polycarbonate (PC). Fabric (coating), vacuum evaporation or ion sputtering and other processing methods to form.

Secondly, since the microstructure layer 2d is not a black covering material as a whole, the light will be partially reflected when passing through, so that the light can return to the original light path for reuse, which can improve the overall luminous efficiency of the light diffusion sheet 4, and when When the light passes through the microstructure layer 2d formed by the separated micro-regions 2e and the complete micro-regions 2f, a diffusion phenomenon will occur, thereby making the luminescence of the region more uniform at each viewing angle.

Fig. 4A, 4B is the light diffusion sheet 5 that can improve the phenomenon of light rays according to the second embodiment of the present invention. The main difference from Fig. 3A, 3B is that the microstructure layer 2g has a plurality of Separated micro-regions 2h, each separated micro-region 2h is square in shape, and the size of the separated micro-regions 2h in each column gradually changes from left to right, and the distance between adjacent separated micro-regions 2h in each column And the spacing between the separated micro-regions 2h of two adjacent columns gradually changes from left to right, and the complete micro-region 2i is located on the right side of the separated micro-regions 2h in multiple columns and is designed to be larger than each separated micro-region 2h, so The complete micro-region 2i cooperates with a plurality of separate micro-regions 2h to form a specific pattern of density changes, thereby changing the light transmittance of this region to control the light distribution in the bright line region, which can reduce or eliminate The improvement purpose of Hui line.

Although the present invention has been disclosed in detail using the above-mentioned preferred examples, they are not intended to limit the present invention, and various alterations and modifications made on the basis of the present invention shall belong to the protection scope of the present invention.

[Description of component symbols]

1 light diffuser

2 Substrate

2a Diffusion layer

2b antistatic layer

2c masking layer

2d microstructure layer

2e Separated micro-regions

2f complete microregion

2g microstructure layer

2h Separate micro-areas

2i complete micro-region

3 light diffuser with shielding layer

4 Light diffuser with microstructure layer

5 Light diffuser with microstructure layer

Claims (18)

1. An optical element that can improve the phenomenon of light rays, which has a light incident surface and a light exit surface, allowing light to pass through the optical element through the light incident surface to the light exit surface, characterized in that: the optical element includes : At least one microstructure layer is arranged on one side of the light incident surface or the light exit surface, the at least one microstructure layer has a plurality of separated microregions and at least one complete microregion, and the complete microregion is larger than each separated microregion regions, the separate micro-regions cooperate with the complete micro-regions to form a predetermined pattern. 2. The optical element capable of improving the light glow phenomenon as claimed in claim 1, characterized in that: the density of the predetermined pattern is designed to change the light transmittance of the optical element, so as to improve the light glow phenomenon . 3. The optical element capable of improving the phenomenon of light rays according to claim 2, characterized in that: the design of density is achieved by changing the shape and size of each micro-region or the distance between adjacent micro-regions. 4. The optical element capable of improving the light glow phenomenon as claimed in claim 1, wherein the transparency of each micro-region is designed to change the light transmittance of the optical element, so as to improve the light glow phenomenon . 5. The optical element capable of improving the light glow phenomenon as claimed in claim 4, wherein the design of the transparency is achieved by changing the material of each micro-region. 6. The optical element capable of improving the phenomenon of light rays as claimed in claim 1, wherein each micro-region is a printed dot. 7. The optical element capable of improving light glow as claimed in claim 6, wherein the printed dots are formed by UV-resistant ink. 8. The optical element capable of improving light glow as claimed in claim 7, wherein the anti-ultraviolet ink is opaque. 9. The optical element capable of improving light glow as claimed in claim 7, wherein the anti-ultraviolet ink is partially transparent. 10. The optical element capable of improving light glow as claimed in claim 1, wherein each micro-region is formed of a translucent material. 11. The optical element capable of improving light glow as claimed in claim 10, wherein the translucent material is polycarbonate. 12 . The optical element capable of improving light ray phenomenon as claimed in claim 11 , wherein the translucent material is formed by coating, vacuum evaporation or ion sputtering. 13 . 13. The optical element capable of improving the light glow phenomenon according to any one of claims 1 to 12, wherein the optical element is a light diffusion sheet. 14. The optical element capable of improving light glow as claimed in claim 13, wherein the light diffusion sheet comprises: a substrate; a diffusion layer arranged on one surface of the substrate, and the opposite surface of the diffusion layer facing the surface of the substrate serves as a light-emitting surface; and An antistatic layer disposed on the other surface of the substrate, the opposite surface of the antistatic layer facing the other surface of the substrate serves as the light incident surface, Wherein at least one microstructure layer is arranged on one side of the diffusion layer as the light-emitting surface or the antistatic layer as the light-incoming surface. 15. The optical element capable of improving the light glow phenomenon according to any one of claims 1 to 12, wherein the optical element is a condensing sheet. 16. The optical element capable of improving the light glow phenomenon as claimed in claim 15, wherein the condensing sheet comprises: A substrate, a surface of the substrate is used as a light incident surface; and a light-gathering layer arranged on the other surface of the substrate, the opposite surface of the light-gathering layer facing the other surface of the substrate serves as a light-emitting surface, Wherein at least one microstructure layer is arranged on the side of the light-gathering layer as the light-emitting surface or the substrate as the light-incoming surface. 17. A backlight module with a light diffusion sheet, characterized in that: the light diffusion sheet includes: a substrate; a diffusion layer arranged on one surface of the substrate, and the opposite surface of the diffusion layer facing the surface of the substrate serves as a light-emitting surface; and An antistatic layer disposed on the other surface of the substrate, the opposite surface of the antistatic layer facing the other surface of the substrate serves as a light-incident surface, Wherein at least one microstructure layer is arranged on one side of the diffusion layer as the light-emitting surface or the antistatic layer as the light-incoming surface. 18. A backlight module with a light-condensing sheet, characterized in that: the light-condensing sheet includes: A substrate, a surface of the substrate is used as a light incident surface; and a light-gathering layer arranged on the other surface of the substrate, the opposite surface of the light-gathering layer facing the other surface of the substrate serves as a light-emitting surface, Wherein at least one microstructure layer is arranged on the side of the light-gathering layer as the light-emitting surface or the substrate as the light-incoming surface.

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