Patent Issued for Backlight Unit and Liquid Crystal Display Using the Same Comprising First and Second Light Guide Plate Arrays Connected to and Independently Controlled by First and Second Light Arra
The patent's assignee for patent number 8508692 is
News editors obtained the following quote from the background information supplied by the inventors: "Exemplary embodiments of the invention relate to a backlight unit capable of local dimming and a liquid crystal display using the same.
"A liquid crystal display according to an active matrix driving method displays moving pictures using thin film transistors (TFTs) as switching elements. The liquid crystal display is applied television sets as well as portable information devices, office automation apparatuses, computers because it is possible to be made thinner than a cathode ray tube (CRT). Accordingly, the liquid crystal display rapidly replaces the CRT in a recent.
"The liquid crystal displays have an increasing application range because of light-weight, thin, low-power consumption features. The liquid crystal display has been used for portable computers such as laptop computers, office automation apparatuses, audio/video devices, and indoor/outdoor advertisement displays. A transmissive type liquid crystal display which occupies all most liquid crystal display devices displays a desired picture by controlling an electrical field applied to liquid crystal layer to modulate light-incedent from a backlight unit. The backlight unit is mainly classified into a direct type and an edge type.
"Picture quality of the liquid crystal display depends on contrast property. The method improving the picture quality by modulating light-incedent from the backlight unit has a limitation. In order to improving the contrast property, a backlight dimming control method which adjusts luminance of the backlight unit according to the picture has been variously attempted. The backlight dimming control method may reduce power consumption by adaptably adjusting the luminance of the backlight unit depending on an input picture. The backlight dimming control method includes a global dimming method entirely adjusting luminance of a display screen and a local dimming method locally adjusting luminance of the display screen. The global dimming method may improve dynamic contrast measured between a previous frame and a next frame but it is difficult to improve static contrast. On the other hand, the local dimming method may improve static contrast by locally controlling luminance of the display screen in one frame period. However, the local dimming method needs a very complicated construction and algorithm because it makes luminance differences and flickers between a plurality of blocks divided in the display screen and flicker and also it needs many circuit elements. Also, the local dimming method is applicable to only the liquid crystal display using the direct type backlight unit.
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