Light source diffusion plate and backlight module

Abstract

The invention discloses a backlight module and a light source diffusion plate applied in the backlight module, able to effectively make outgoing light brightness uniform, and the backlight module comprises multiple light sources; the light source diffusion plate comprises a transparent substrate and multiple optical structures, where the transparent substrate has a light incoming surface and a light outgoing surface; these optical structures are arranged on the light outgoing surface and each optical structure is sunken from the light outgoing surface to the inside of the transparent substrate and formed with a refractive inner convex surface inside the transparent substrate, where each refractive inner convex surface corresponds to one of the light sources; the smallest included angle between the edge of the refractive inner convex surface and the normal of the light outgoing surface is less than 30 deg, making an incident light emitted from the light source deviate from the normal of the refractive inner convex surface by refraction of the refractive inner convex surface.

Description

technical field [0001] The invention relates to a light source diffuser plate and a backlight module. The light source diffuser plate is suitable for the backlight module and can make the brightness of the emitted light uniform. Background technique [0002] Since a liquid crystal display (LCD for short) is a non-self-luminous display device, a backlight source is required to supply a light source with sufficient brightness and uniform distribution so that it can display images normally. At present, most of the backlight sources use light emitting diodes (LED for short) and cold cathode tubes as the main light-emitting components. Light-emitting diodes have the advantages of diverse luminous colors, power saving, small size, long life, fast response, low pollution, high reliability, and large module flexibility, and their importance has been increasing day by day. However, when the LCD panel uses LEDs as the light source, it is easy to produce the problem of uneven brightne...

AI Technical Summary

Problems solved by technology

However, under such an optical path structure, due to the nature of the material itself and chemical particles, it will cause unavoidable light absorption and reduce the light source transmittance

In the above architecture, the scattering of light is random and scattered, so for observers at a fixed distance, part of the light source will be wasted, resulting in the ineffective use of the light source

In addition, the chemical manufacturing process of the diffusion film production method is time-consuming, and the production cost required is relatively high

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