Backlight module, a narrow-frame liquid crystal display device and forming process of plastic frame

Abstract

The invention provides a backlight module, a narrow-frame liquid crystal display device and a forming process of a plastic frame, a plastic frame inner wall of the plastic frame of the backlight module is a gradient gray surface such that the gray of the plastic frame inner wall may be specifically increased to absorb light generating marginal bright beams, thus eliminating the marginal bright beams of the liquid crystal display device, and further, it is possible to reduce a distance between the plastic frame and the edge of a display area of a liquid crystal display panel, providing narrow-frame design of the liquid crystal display device and reducing brightness loss of the backlight module. The narrow-frame liquid crystal display device using the above-mentioned backlight module has a reduced distance between the plastic frame inner wall and the edge of the display area, providing the narrow-frame design and reducing the brightness loss of the backlight module. In the forming process of the plastic frame, the gray of the plastic frame inner wall is made gradient through 3D printing technology, and die opening cost and time are greatly saved when compared to the traditional die process.

Description

Technical field [0001] The invention relates to the field of liquid crystal display, in particular to a backlight module, a narrow frame liquid crystal display device and a molding process of a plastic frame. Background technique [0002] Liquid crystal display devices (Liquid Crystal Display, LCD) have many advantages such as thin body, power saving, and no radiation, and have been widely used. Such as: LCD TV, mobile phone, personal digital assistant (PDA), digital camera, computer screen or notebook computer screen, etc., occupy a dominant position in the field of flat panel display. Most of the liquid crystal display devices currently on the market are backlight liquid crystal display devices, which include a liquid crystal panel and a backlight module (Backlight Module). Generally, the structure of a liquid crystal panel is composed of a color filter substrate (ColorFilter), a thin film transistor array substrate (ThinFilmTransistorArraySubstrate, TFTArraySubstrate), and a ...

AI Technical Summary

Problems solved by technology

but if figure 1 As shown, the glue frame 110 and the edge of the display area 310 (ActiveArea, AA) of the liquid crystal panel 300 must always keep a certain distance d, usually at least 0.75 mm, to prevent the occurrence of light leakage at the edge of the display at a large viewing angle, and a glue 120 is required. To block a part of the upward light, that is, to prevent a bright line from appearing at the edge of the screen when viewing from a large viewing angle, which affects the image quality, so this also limits the extent to which the frame can be narrowed to a certain extent

[0005] Obviously, the grayscale of the inner surface of the plastic frame 110 opposite to the light guide plate 130 has an influence on light absorption, and the darker the grayscale, the stronger the absorption of light. Then, in order to solve the above problem, deepen the grayscale of the inner surface of the plastic frame 100. The distance between the plastic frame 110 and the edge of the display area 310 of the liquid crystal panel 300 can be reduced, but on the other hand, the stronger the absorption of light by the plastic frame 110, the greater the brightness loss of the backlight module 100; in addition, Different areas of the inner surface of the plastic frame 110 receive different illuminance. If the inner surface of the plastic frame 110 only has a single color deepening, although light is absorbed, it is easy to cause local uneven brightness and darkness of the display screen. However, the traditional mold process is very difficult. It is difficult to realize the grayscale gradient of the plastic frame

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