Direct type backlight module

Abstract

The invention provides a direct type backlight module. The backlight module comprises a first reflective layer provided with a plurality of openings, a second reflective layer and a visible light luminous part arranged between the first reflective layer and the second reflective layer, wherein by adjusting the relative positions of the luminous part, the first reflective layer and the second reflective layer, the strength of the light directly passing the photic zones is equal to that of the light reflected by the reflective layers, so that the use of a scattering film is reduced, the light loss is lowered, the light source is made work under a lower power, the energy is saved, and the heating value is reduced.

Description

technical field [0001] The present invention relates to a direct-lit backlight module, and more particularly to a direct-lit backlight module that reduces or even eliminates the use of a diffusion film. Background technique [0002] As the name suggests, the direct type backlight module means that the lamp tube is placed under the diffuser plate, and the lamp tube can be straight, U-shaped or W-shaped. Since it must have higher brightness when used as a TV, the number of lamp tubes used is large, so there will be a problem of high temperature. [0003] figure 1 It is a schematic cross-sectional view of a direct-lit backlight module used in a liquid crystal display. From top to bottom, there are liquid crystal 10, brightness enhancement film 12, diffusion film 14, lamp tube 16, and reflective layer 18. When the liquid crystal display uses a similar figure 1 When using a direct-lit backlight module, the strip-shaped particularly bright area is formed due to the light emitted...

AI Technical Summary

Problems solved by technology

However, the use of diffusion film has a great loss of luminosity. In order to achieve uniform brightness, more than two diffusion films are generally used. Taking LCD TV as an example, the average loss of one diffusion film is about 23% and the average loss of two films is nearly 40%. Therefore, the number of lamps used needs to be doubled, and the doubled number of lamps will cause a series of problems, including increased cost, increased power consumption accounting for 90% of the total display, and poor heat dissipation, etc.

[0004] In addition, if figure 2 As shown, when the light tube in the backlight module is too long, there will also be a problem that the light at both ends 20 of the light tube is strong, while the light at the center 22 of the light tube is weak

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