Abstract
The authors investigated a full sealed flat-panel light source, which is based on a triode structure with a metal mesh gate electrode and uses a carbon nanotube cold cathode. It has a flat surface luminance distribution with good uniformity, a stable luminance of 12000cd∕m2, and a luminous efficiency that was measured to be 14.5lm∕W. It also shows a high color rendering index of 88 and a wide optical emission spectrum. Further, its application as thin film transistor–liquid-crystal display (TFT-LCD) backlight was demonstrated and the resulted performance of the TFT-LCD display was studied and compared to the commercial TFT-LCD products, which use the cold-cathode fluorescent lamp backlight and light emitting diode backlight. It is shown that the light transmission ratio in the TFT-LCD module using our light source is ∼8%, as compared to ∼4% of the commercial products. With this and the very high luminance, our light source is very useful to the situation, in which the TFT-LCD screen is employed to work under outdoor sunshine conditions.
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