| 摘要 |
Light for backlight to illuminate an LCD is irregularly reflected on a reflection plate. Part of the light leaks from the reflection plate to a rear surface side thereof. An aspherical lens collects the leakage light. Optical fibers guide the collected light to an object to be illuminated. The leakage light which inevitably leaks from the reflection plate and which has been wasted can be efficiently used. It is also advantageous to positively increase the leakage light such that the quantity of leakage light thus obtained is more than that of the leakage light inevitably appearing in a natural condition. Since the extension of the optical fibers is of side irregular reflection type, light sources can be provided at arbitrary locations thereof By efficiently using light for the backlight, the user's operating section can be illuminated while completely minimizing power consumption. The leakage part of light for the backlight from the irregular reflection plate can be efficiently used.
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