Optical diaphragm of backlight unit, manufacturing method thereof and manufacturing device thereof

Abstract

The invention relates to an optical diaphragm of a backlight unit, a manufacturing method thereof and a manufacturing device thereof. The optical diaphragm is provided with a substrate; the surface of the substrate is provided with a plurality of arc bumps distributed according to a random number; the arc bumps are distributed in the proportion of about 90 to 99 percent; the random arc bumps allow light beams to scatter at a fixed angle; and the distribution proportion of structures in unit area is increased to achieve the efficiency of intensifying light. The method for manufacturing the structural diaphragm can effectively produce the optical diaphragms with the composite function of light collection and scattering.

Description

technical field [0001] The invention relates to an optical film of a backlight group and its manufacturing method and its manufacturing device, especially to an optical film with light-collecting and diffusion composite functions and its manufacturing method, which can increase the structure distribution ratio per unit area to achieve the effect of increasing light and its manufacturing equipment. Background technique [0002] By the way, the rapid progress of the multimedia society is mostly benefited from the dramatic progress of semiconductor components or man-machine display devices. As far as displays are concerned, cathode ray tubes (Cathode Ray Tube, referred to as CRT) have excellent display quality and economical efficiency. , has been monopolizing the display market in recent years. However, for the environment where individuals operate most terminals / display devices on the table, or from the perspective of environmental protection, if the trend of energy saving ...

AI Technical Summary

Problems solved by technology

[0003]The general backlight module mainly includes a light source and a plurality of optical films. After the light source can obtain relatively uniform and bright light through each optical film, the liquid crystal The panel shoots out; among them, in order to save the use of the optical film and reduce the thickness of the backlight module, there is an optical film with light-enhancing and diffusion functions, such as China Taiwan Invention Patent Publication No. 200720711, the patent name "used for the backlight unit" Light diffusion sheet and its manufacture", as shown in Figure 1 As shown, the light diffusing sheet 1 is provided with a transparent substrate 11, and on the transparent substrate 11 there are a plurality of randomly and irregularly distributed hemispherical structures 12, and the distribution ratio of the hemispherical structures 12 in a fixed range is about 50% to 90%. However, the distribution ratio limit of each hemispherical structure is 90%, which cannot effectively improve the overall optical luminance, and the convex arc-shaped surface formed by the hemispherical structure cannot have the effect of improving the optical luminance due to the arc curvature is too large

[0004] In addition, the manufacturing method of the light diffusion sheet 1 is as Figure 2, a patterned forming wheel 21 is first provided, and the forming wheel 21 is provided with a plurality of randomly distributed arc-shaped grooves (not marked in the figure) ), apply photocurable resin 22 on the molding wheel 21, and then place the transparent substrate 11 on the photocurable resin 22, pressurize the press wheel 23 and use the UV lamp 24 at the same time, so that the photocurable resin 22 can be cured and formed at the same time , so that the photocurable resin 22 forms a hemispherical structure (marked in the figure) corresponding to the arc-shaped groove on the molding wheel 21; It will affect the optical brightness of the molded light diffusion sheet, and if the photocurable resin has poor fluidity, it cannot be filled in the finer arc-shaped grooves, and the ratio of the arc-shaped grooves distributed on the molding wheel is about 50 %~90%, so that the proportion of hemispherical structure distributed in a fixed range is about 50%~90%, unable to break through the technical bottleneck of 90%

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