Narrow bezel side-entry liquid crystal display laser backlight

Abstract

The invention discloses a narrow bezel side-entry liquid crystal display laser backlight. The backlight source comprises visible light laser groups, a beam shaping device, a reflection device and a liquid crystal display light guide plate. After a laser beam emitted by a visible light laser is reflected by the reflection device, the light propagation direction changes by 180 degrees, and the laserbeam is incident on the liquid crystal display light guide plate through a light-transmitting surface. Each visible light laser beam emitted by the adjacent visible light laser groups generates a light overlap larger than 10% of the area of the respective light spot when the laser beam is incident on the light-transmitting surface on the side of the liquid crystal display light guide plate through the reflection device. The sum of the lengths of the laser beam light spots of the same-band visible light laser groups on the light-transmitting surface on the side of the liquid crystal display light guide plate is greater than or equal to 0.65 times the length of the light-transmitting surface. According to the invention, the best screen brightness and picture brightness color uniformity of aliquid crystal display are realized with the smallest number of visible light lasers.

Description

technical field [0001] The invention relates to a light source of a laser liquid crystal display, in particular to a backlight source structure of a side-entry laser liquid crystal display. Background technique [0002] The optical system of the existing liquid crystal display is designed for the surface light source with LED as the basic component of light emission, and has been very mature. [0003] The advantages of LED light sources are: [0004] The light space divergence angle is about 150° without axial difference, and the light energy is approximately uniform [0005] The shape and size of the light-emitting area of ​​LED can be changed by semiconductor processing technology [0006] The white light synthesis method of the LED-based display light source is simple, and can form uniform white light [0007] ·The LED light source has low heat dissipation requirements, and the heat dissipation heat sink is small, light and thin, and has a simple structure [0008] Th...

AI Technical Summary

Problems solved by technology

[0015] 1. All-solid-state lasers are large in size, low in efficiency, extremely high in cost, and complex in structure, and cannot be used as a light source for flat liquid crystal displays

[0016] 2. The existing laser light source that can be used as a liquid crystal display can only be a semiconductor laser

Since the three-color lasers are directly incident on the light guide plate, the distance between the lasers is too far, the intensity distribution of the red, green and blue three-color lasers is uneven, and white light cannot be synthesized, resulting in the phenomenon of blurred screen and uneven brightness and darkness of the screen ( figure 1 ), which cannot meet the normal use requirements of the liquid crystal display

However, for large-size LCD screens, higher brightness is required to support the picture quality. The actual technical implementation of this patented solution requires more than 600 lasers to meet the backlight requirements of large-screen LCD screens. Cost and heating power consumption will increase exponentially

[0031] None of these existing patent solutions can solve the practical problems of color spots, color bands, uneven distribution of light field and low brightness caused by the mismatch between visible light end-emitting semiconductor lasers and the optical system of the existing side-entry LED liquid crystal display.

[0032] Existing side-entry LED LCD backlight optical systems cannot match end-emitting laser sources

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