| 摘要 |
In a liquid crystal display device having a liquid crystal display panel, the liquid crystal display panel includes a display section having a plurality of pixels disposed therein and a peripheral section disposed so as to surround the display section. A display corresponding to a touch key is displayed on the display section at a boundary portion between the display section of the liquid crystal display panel and the peripheral section adjoining thereto. A photosensor for detecting light is disposed at a portion in the peripheral section near the display corresponding to the touch key. In this liquid crystal display device, the photosensor produces an output of a current value detected as a result of all or part of external light being shielded when a viewer touches the display corresponding to the touch key on the display section.
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