Composite optical membrane, backlight module and liquid crystal display device

Abstract

The invention discloses a composite optical membrane, a backlight module and a liquid crystal display device. The composite optical membrane comprises at least two prism type membranes which are arranged in an intersecting way; diffusion sheets with high positive penetration rates are attached to the prism type membranes; and the positive penetration rates of the lower diffusion sheets with high positive penetration rates are higher than 85 percent and lower than 95 percent. In a framework formed by the lower diffusion sheets and the intersecting prism type membranes in the invention, the relation between the positive penetration rates of the lower diffusion sheets and the luminance gain of the entire optical membrane is integrally reached, and an appropriate range of the positive penetration rates of the lower diffusion sheets with high positive penetration rates is determined, so that the optical functions of the lower diffusion sheets can be ensured, the luminance gain of the composite optical membrane is increased remarkably, and appropriate luminance is achieved for the backlight module.

Description

technical field [0001] The invention relates to the field of liquid crystal display, and more specifically, relates to a composite optical film, a backlight module and a liquid crystal display device. Background technique [0002] The role of the backlight module in LCD display is very important, and the use of the optical film in the backlight module is the key to improving the brightness and uniformity of the backlight. Commonly used diaphragms mainly include diffusers (including the upper diffuser (Up Diffuser) and the lower diffuser [Diffuser (DF)]), prism diaphragm BEF (including the prism (prism) and lens (lenticular)] , micro-lens [micro-lens (ML)], reflective polarizing film (DBEF), etc., but the use of a single film must ensure high luminance, high cost angle, and requires a high-power backlight source, high heat, and The heat is concentrated near the light-bar, which affects the display quality and the service life of the device. How to optimize the luminance gai...

AI Technical Summary

Problems solved by technology

Although the addition of diffusers solves the problem of the angle of view of two prism-type diaphragms crossed, it also solves the problem of the mura taste of the light guide plate outlets. However, the brightness is significantly reduced, so it is necessary to further study how to solve the problem of narrow viewing angle and dots of the light guide plate, and reduce the loss of luminance

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