Patent ID: 7515223
Filing Date: 2009-04-07
Classification: G02B,G02F,G09G

Abstract:
1. A display apparatus selectively operated in a first mode and a second mode, said display apparatus comprising; a unitary display panel having a viewer side and a back side, said viewer side divided into a first area and a second area, in response to an image signal, said first area and said second area configured to display variable data on said viewer side; a first light source for illuminating said first area from said back side; and a second light source for illuminating said second area from said back side; wherein said first area and said second area are illuminated with substantially same brightness by said first light source and said second light source simultaneously to make said first area and said second area having substantially same visually brightness on the viewer side when said display apparatus is operated in said first mode; wherein said second light source is driven to a lower brightness level to make said second area visually darker than said first area on the viewer side when said display apparatus is operated in said second mode for conserving power of said display apparatus.