Collimation backlight module and display device

Abstract

The invention provides a collimation backlight module and a display device. The collimation backlight module comprises a first light guide plate, a collimation light source, a first collimation lighttaking part, a first flat layer, a second light guide plate, a first diffraction modulation part, a second diffraction modulation part, a second collimation light taking part and a third collimation light taking part and is characterized in that the collimation light source couples collimation light into the first light plate to perform total reflection transmission; the first collimation light taking part takes out first-color light in the collimation light in the first light guide plate in a way that the first color light is vertical to a first light-emitting face and in a collimation manner, takes out the second-color light in the collimation light in the first light guide plate at first inclination angle and in a collimation manner and takes out the third-color light in the collimationlight in the first light guide plate at second inclination angle and in a collimation manner; the first flat layer covers the light-emitting face of the first light guide plate; the second light guide plate is arranged on the first flat layer; the first diffraction modulation part couples the second-color light into the second light guide plate inn a diffraction modulation manner to perform totalreflection transmission; the second diffraction modulation part couples the third-color light into the second light guide plate in a diffraction modulation manner to perform total reflection transmission; the second collimation light taking part vertically takes out the second-color light in a collimation manner; the third collimation light taking part vertically takes out the third-color light in a collimation manner. The collimation backlight module can provide three-color collimation backlight to achieve colored display.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a collimation backlight module and a display device. Background technique [0002] In a traditional liquid crystal display (Liquid Crystal Display, LCD), the backlight module provides the illumination source, and the light wave is polarized through the polarizer (polarizer), enters the liquid crystal panel after being modulated, and then passes through the analyzer (polarizer) and Color filters, presenting colorful images. Color filters are the key components of LCD. At present, most of the color filters basically need to be purchased from abroad, the cost is high, and the transmittance of the color filters is only 27%, which is the only LCD with a light energy utilization rate of less than 5%. main reason. [0003] In addition, most of the near-eye display solutions such as AR / VR on the market are based on collimated backlight design, but the current collimated backlight solu...

AI Technical Summary

Problems solved by technology

Color filters are the key components of LCD. At present, most of the color filters basically need to be purchased from abroad, the cost is high, and the transmittance of the color filters is only 27%, which is the only LCD with a light energy utilization rate of less than 5%. main reason

[0003] In addition, most of the near-eye display solutions such as AR / VR on the market are based on collimated backlight design, but the current collimated backlight solutions are all focused on monochromatic collimation or bulky lens collimation solutions, so , the demand for thin and simple collimated backlight structure and technology is very large. If the color thin and light collimated backlight can be realized, it will promote the express development of AR / VR industry

However, in the current collimated backlight, only a single color of light can be extracted through collimation, so it is essentially a monochrome display solution. Therefore, it is necessary to propose a color display solution that is conducive to industrialization

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