High-brightness and wide-color-gamut direct type backlight module and liquid crystal display applying module

Abstract

The invention discloses a high-brightness and wide-color-gamut direct type backlight module and a liquid crystal display applying the module. The high-brightness and wide-color-gamut direct type backlight module comprises an optical membrane set, a backlight lamp plate, and a plurality of colored lamps and white lamps which are arranged on the backlight lamp plate and are mixed and matched; the optical membrane set sequentially comprises a polarization type brightness enhancing membrane, a brightness enhancing membrane and a diffusion membrane from top to bottom; the backlight lamp plate is located below the optical membrane set; the ratio of a light mixing distance of the colored lamps and the white lamps to the distance between the lamps of the same type is (1.1-1.2) to 1; and the light mixing distance is the distance from the upper surface of each lamp to the lower surface of the diffusion membrane. According to the high-brightness and wide-color-gamut direct type backlight module, an optimal RGB (Red, Green and Blue) lamp for improving a color gamut of the liquid crystal display is obtained; a light mixing defect of the full colored lamps is improved by applying a method of mixing and matching the colored lamps and the white lamps; and meanwhile, the light mixing distance is reduced. Backlight is optimized so that the excellent display quality and optical taste of a liquid crystal module are realized under the condition of keeping the high brightness and the wide color gamut, and the thickness of a full-colored-lamp direct type backlight cavity is reduced.

Description

technical field [0001] The invention relates to a liquid crystal display module, in particular to a direct-lit backlight module with high brightness and wide color gamut and a liquid crystal display using the module. Background technique [0002] A typical liquid crystal display module consists of a backlight and a liquid crystal screen, and the liquid crystal screen in front of the backlight contains pixels whose transmittance can be changed. The backlight illuminates it from behind the LCD screen. The transmittance of a pixel can be reduced until the pixel is completely black, or it can be increased until the pixel is brightest. By providing appropriate driving signals to the pixels, resulting in the desired bright and dark areas, so that the image can be displayed on the liquid crystal display module. [0003] In a typical color LCD module, each pixel consists of individually controllable red, green and blue cells. Each unit contains a filter that transmits the corresp...

AI Technical Summary

Problems solved by technology

There are two problems with this method: 1. With the existing industrial technology, it is difficult to make the response time of the liquid crystal fast enough to match this color mixing; 2. It is very difficult to control the color of the multi-color LED backlight

However, this white light customization method also has difficulties such as long cycle time and repeated trials, which is difficult for small manufacturers to implement.

[0007] The high brightness and wide color gamut of the liquid crystal display module can be realized by using RGB three-color lamps with high luminous efficiency and suitable dominant wavelength. However, the light mixing distance of the full-color lamp direct-lit backlight using this method is relatively large, and the thickness of the module is also relatively large. thicker

If the light guide device is used to compress the light mixing distance for light guide, it will increase the pressure on design and cost

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