A white-and-blue mixed LED Backlight for airplane display

摘要

As LCDs are not self-luminance, a backlight unit (BLU) is necessary for LCDs. For a display installed on an airplane,the brightness of a BLU is required to be very high and the color temperature should be able to change to higher in orderto guarantee the pilot can clearly and accurately read the information on the display. This paper presents a LED BLUconsisting of high-luminous-efficiency white LEDs and blue LEDs. White LEDs with the luminous efficiency as high as120lm/W provide the most of luminance. When an airplane flies to higher altitude, the pilot can push a button to lightenthe blue LEDs to change the color temperature. The paper presents a theoretical model for luminous flux estimation. Thesimulation results show that the white-and-blue-LED-mixed BLU presents the merits of high brightness, various colortemperatures, high uniformity, and less complicated control.