In order to improve the uniformity of the LCD backlight
a kind of plano-concave lens array was used in straight down type LCD backlight module instead of the diffusion films. For 106.68 mm (42 in) LCD monitor LED backlight
the illuminance distribution was simulated
and the optimized lens radius
structure
distance of LED array were determined. The effect of different lens radius and lens array position on the uniformity of backlight was also discussed. The results show that the plano-concave lens array can diffuses lights better when the radius of lens is 1 mm and the thickness of lens is 2 mm
the uniformity of light reaches 88.61%.
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references
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