| 摘要 |
A display device is provided, including a signal transmission mechanism that makes it possible to reduce the number of pins on an FPC board connected to a TFT substrate or eliminate the necessity for the FPC board, and that can be readily applied to a compact device. The present liquid crystal display device includes light detectors (90), a receiver circuit (100), a display control circuit (200), a video signal line drive circuit (300), a scanning signal line drive circuit (400) , and a display portion 500, which are formed on a TFT substrate of a liquid crystal display panel (2), and it also includes white LEDs (40a) to (40c), and an LED drive circuit (51), which are included in a backlight portion (3). The LED drive circuit (51) drives the white LEDs (40), each emitting a light (modulation) signal LS in accordance with an externally-provided video signal VS. The receiver circuit (100) generates (demodulates) the video signal VS based on a signal received via the light detector (90). Such an optical transmission mechanism makes it possible to reduce the number of pins on the FPC board or eliminate the FPC board.
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