Light shadow elimination method and liquid crystal product for direct-lit LED backlight
A technology of LED backlight and LED light source, which is applied in the direction of light source, semiconductor device of light-emitting element, optics, etc., can solve the problems that affect the appearance of the whole product, affect the display effect of liquid crystal products, and the uneven light of the liquid crystal panel, etc., to achieve Improve the display effect, shorten the light mixing distance, and eliminate the effect of light shadow problems
Active Publication Date: 2016-06-08
QINGDAO GOERTEK
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Problems solved by technology
[0004]However, when the number of LEDs is increased, the cost of the whole machine will be greatly increased due to the high cost of LEDs and lenses; It will lead to an increase in the thickness of the product, which will affect the aesthetics of the overall product appearance
If you reduce the number of LEDs used or shorten the light mixing distance in order to reduce the cost of the whole machine or realize the ultra-thin design of the whole machine, it may cause uneven light irradiating the LCD panel, resulting in light shadows and seriously affecting the LCD panel. The display effect of the product
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[0025] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0026] This embodiment is aimed at liquid crystal products designed with direct LED backlight lighting technology. When the number of LEDs used in the product is small or the light mixing distance from LED to diffuser plate is short, uneven illumination of the liquid crystal panel (that is, light shadow phenomenon) is likely to occur. Problem, a method that can effectively eliminate the shadow phenomenon of direct-lit LED backlight is proposed. By modifying the local reflection characteristics of the reflective sheet used to reflect LED light in the backlight module, it is possible to reduce the amount of light caused by the LED light source projected on the reflective sheet. The reflectivity of the spot area, and then reduce the difference between the light intensity reflected by the spot area and the light intensity ref...
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The invention discloses a lampshade elimination method for a direct type LED backlight source and a liquid crystal product. An LED light source is utilized for irradiating a diffuser plate, scattered light directly emitted outside the diffuser plate by the LED light source is reflected through a reflection sheet, a light spot area is formed on the reflection sheet through the scattered light, and the reflectivity of the reflection sheet in the light spot area is reduced. A method for locally modifying reflection characteristics of the reflection sheet is adopted to reduce the reflectivity in the light spot area formed by the LED light source, so that intensity of light received by a liquid crystal panel directly facing the LED area is weakened, then, intensity of the light received by the whole liquid crystal panel is homogenized, the lampshade problem of the liquid crystal panel is solved, and the display effect of the liquid crystal panel is improved. The method is applied to the liquid crystal product by adopting the direct type LED backlight source technology, a certain number of LEDs can be removed or the light mixing distance between the LEDs and the diffuser plate is properly shortened, the whole machine cost is reduced, and the attractiveness of the appearance of the whole machine is improved.
Description
technical field [0001] The invention belongs to the technical field of liquid crystal display products, and in particular relates to a liquid crystal display product designed by adopting direct-type LED backlight lighting technology. Background technique [0002] Current liquid crystal display products mainly use direct-type LED backlight technology or side-type LED backlight technology to illuminate the liquid crystal panel to realize the display of the picture. At present, direct-lit LED backlight technology mainly uses LED mounting lens (lens) as the core component, using the lens to expand the divergence angle of the LED light, and using the air slot formed between the LED and the diffuser plate to provide the light mixing distance for the LED light. Furthermore, the LED light is evenly mixed and then reaches the diffusion plate, and after the LED light is further diffused through the diffusion plate, it is uniformly irradiated onto the entire liquid crystal panel. [0...
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IPC IPC(8): G02F1/13357F21Y115/10
Inventor 倪玲玲刘风磊
Owner QINGDAO GOERTEK