Preparation method of light guide plate, light guide plate, backlight module and display device

Abstract

The embodiment of the invention discloses a preparation method of a light guide plate, the light guide plate, a backlight module and a display device, and relates to the field of display. The preparation method of the light guide plate, the light guide plate, the backlight module and the display device can effectively improve bad yellowing of a back light source and improve the brightness and evenness of outgoing light of the light guide plate. The preparation method of the light guide plate comprises the steps that the light guide plate with fine adjusting lattice points on the bottom face is formed by adopting an injection molding mode, and the bottom face is opposite to a light outgoing surface of the light guide plate; on the bottom face of the light guide plate, rough adjusting lattice points are prepared through an ink printing forming mode by using ink mingled with blue dyestuff, and the average size of the rough adjusting lattice points is larger than that of the fine adjusting lattice points.

Description

technical field [0001] The invention relates to the display field, in particular to a preparation method of a light guide plate, a light guide plate, a backlight module and a display device. Background technique [0002] The light guide plate is one of the key components of the backlight module. During preparation, an optical-grade acrylic sheet (or other materials) is formed first, and then the light guide point is printed on the bottom surface of the acrylic sheet using ultraviolet screen printing technology. . The light emitted by the light source enters the acrylic plate from the light incident surface and is transmitted therein. When it hits each light guide point, the reflected light will spread to various angles and then be emitted from the light exit surface of the light guide plate. By optimizing the density and size of the light guide points, the light output surface of the light guide plate can obtain high-brightness and uniform luminance output light. [0003] ...

AI Technical Summary

Problems solved by technology

At this time, in order to reduce the difficulty of optical design, the short side of the glue is generally used to prepare the light guide plate by injection molding. In the process of automatic molding) the raw material preparation process is longer, the contact time between the light guide plate and the high-temperature mold is longer, and the degree of carbonization of the material is relatively serious compared with the way of long-side glue, so that the light transmission through the carbonized raw material has a negative effect on the chromaticity of the light source greater influence, causing the picture on the side opposite to the light-incident side to turn yellow

[0005] Existing solutions include selecting light guide plate materials with good fluidity, using high-speed injection molding machines, and using diamond dots to make light guide plate mold cores, etc., but these methods can only reduce yellowing to a certain extent, and with the backlight mold The reduction effect of the increase of the group size is limited, and the problem of bad yellowing cannot be fundamentally solved

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