Based on the analysis of traditional layout of LED matrix array

a mathematical model is built to optimize the luminance uniformity. Design of novel triangular LED array unit is proposed for improving high uniformity of the direct LED Backlight Units (BLUs) for large area LCD-TVs. With the structure of the triangular LED array unit well illustrated and designed

the comparison simulation between traditional and novel layout using Lighttools software is executed to prove that the novel design performed better on the parameter of uniformity. When the light box thickness is at 20 mm

the uniformity of the novel design reaches 90.79%

which is 2% better than the performance of traditional design at 88.77%; when the layout of the LEDs is dense

the improvement that the novel design brings is not obvious

which is about 1%; along with the rising of the light box thickness

the improvement is redu-cing

when it comes to 24 mm

the figure only stays at 0.3%.