Patent ID: 6151008
Filing Date: 2000-11-21
Classification: G02B,G02F,G09G

Abstract:
An apparatus for controlling a display screen's brightness, the apparatus comprising:a first light bulb;a second light bulb positioned in spaced apart relation to the first light bulb;a diffusion screen positioned in operable relation to the first light bulb and the second light bulb, the diffusion screen providing a relatively consistent brightness level over its entire surface during illumination of one of the first light bulb and the second light bulb and during illumination of both the first light bulb and the second light bulb; anda control circuit coupled to the first light bulb and the second light bulb, the control circuit illuminating one of the first light bulb and the second light bulb in response to a first condition and illuminating both the first light bulb and the second light bulb in response to a second condition.