Huizhou China Star Optoelectronics Technology Co., Ltd.

Xiaoyu He

Linlin Fu

This invention provides a composite diffuser plate comprising a light-emitting layer for emitting light, a middle layer for guiding light, and a light-entering layer for entering light, being sequentially stacked downwardly. At least one surface of the middle layer is provided with an array of curved protrusions. Refractive indexes of the light-emitting layer, the middle layer and the light-entering layer are gradually increased. This invention further provides an ultra-thin direct type backlight module. In the composite diffuser plate of this invention, in addition to a gradual increase in refractive indexes of the light-emitting layer, the middle layer and the light-entering layer, the middle layer is provided with a microstructure having curved protrusions, which further enhances diverging effect of emitting angle. The direct-light TV can increase a light-emitting area with a small OD value, and thus improves a LED Mura problem, realizing a slim direct-light TV and enhancing market competitiveness.

Composite diffuser and ultra-thin direct type backlight module

The present invention provides a diffusion plate and a direct-type backlight module. By disposing the first groove on the light incident side of the second structure layer of the diffusion plate, disposing the second groove or the third protrusions on the light emitting side of the second structure layer, and the refractive index of the first structure layer, the second structure layer and the third structure layer is sequentially increased, the divergence angles of the incident light can be significantly increased, to achieve uniform backlight brightness. The direct-type backlight module of the present application includes the diffusion plate described above. The mura problem can be solved while reducing the number of the LED lamps and the light mixing distance, so as to realize the low cost and slim design of the direct-type backlight module, and are conducive to the use of the direct-type backlight module in the ultra-thin TV field.

Diffusion plate and direct-type backlight module

Provided is a quantum dot (QD) film for backlight unit, which includes a first protective film, a second protective film, a QD material layer, and a transmission/reflection film. The first and second protective films are disposed in opposite to each other and the QD material layer is interposed between the first and second protective films. The transmission/reflection film is disposed at the side of the second protective film facing away from the first protective film for reflecting a part of an incident light and transmitting the other part of incident light. Also provided is a backlight unit having such QD film and a liquid crystal display for enhancing the utilization of QD material and the brightness of the light emitted from the backlight unit, and preventing the backlight unit from emitting light with blue tone.

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Huizhou, China

Xiaoyu He