The Design And Optimization Of A47inch Single-short-edge-lit LGP

Edge-lit backlight module, especially single-short-edge-lit type, can significantly reduce the number of light sources used in liquid crystal displays and the power consumption of the backlight module, and provide a guarantee for the ultra-thin LCD. So it will be the development trends in the last few years. The light guide plate as an important component in the edge-lit backlight system, affect the optical properties of the backlight and the quality of the screen. So the high-performance LGP is the key to the whole backlight.The whole research work of this thesis is based on the47inch single-short-edge-lit type LGP and optical simulation software LightTools.Firstly, we conducted a dots pattern design which is the most complex process and an important factor to the LGP optical properties. Step one, we established a model close to the real one in the software, simply setting the parameters of various components to highlight their own characteristics. Then we focused on the influence of various parameters of the dots pattern optical properties. The ratio of nearly specular reflection and scattering has little effect on the brightness distribution. The greater is scattering properties, the brighter is the area near light source. The change of Gaussian angle relatively has large impact on the brightness distribution. The smaller is the angle, the brighter is the area far from light source. Step two, the result has been fitted after the software automatically optimize the dots pattern distribution, to adjust the unrealistic fill rate of dots pattern. Usually the result is better in10-15times, which is smooth and not distorted. Step three, the samples has been made, which is used for the comparison of simulation results and experimental tests. The fourth sample has the great result.Secondly, in order to get a long strip spot needed to meet the scanning backlight, the lenticular LGP has been simulated. We found that more closely arranged and the larger size semi-circular lens microstructure has the best spot effect.