The color gamut is one of the critical parameters that dictate the image quality of displays. The liquid crystal displays using white color light‐emitting diodes (LEDs) as the backlight, though having been widely employed recently, are not very satisfactory in terms of their color gamut because of the broad spectrum inherent to white LEDs. This prompted the authors to develop improved liquid crystal displays using an edge‐lit wide color gamut backlight that used red laser diodes and cyan LEDs. Generating laser beams with high color purity, the laser diodes are light sources with a significant effect on expanding the color gamut. However, laser diodes, red ones in particular, have unfavorable thermal characteristics. To cope with this shortcoming, the authors clearly defined the restrictive criteria for laying out two kinds of light source on the edge‐lit backlight and made a prototype 55‐type laser backlight for performance evaluation.
The authors have developed the laser backlight for displays that uses laser diodes (LDs) for the red light sources. While laser beams are favorable because of their high color purity, they develop extremely disadvantageous thermal characteristics. Therefore, thermal management is a critical issue for LDs used as display light sources. As for the backlight used on a large screen flat panel display in particular, where light sources with high heat flux are laid out in a dispersed fashion, the cooling performance of the light sources directly influences the product performance and quality. The authors used a CFD simulation to review a cooling system optimum for the laser backlight.
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