Method of boosting a display image, controller unit for performing the method, and display apparatus having the controller unit

• Main Authors: KIM, GIRL, PARK, SE-KI, YEO, DONG-MIN, KIM, JUNG-HYEON, SONG, SI-JOON
• Format: Patent
• Language: English; French; German
• Published: 26.01.2011
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CRYPTOGRAPHY; DISPLAY; EDUCATION; PHYSICS; SEALS

A display controller unit includes a local dimming logic board (100) and a controller board (200). The local dimming logic board generates local dimming signals in response to image data received from an external device. When a boost-worthy portion of image data is found to satisfy predefined boosting conditions, the local dimming logic board increases the luminance value of backlight dimming signal (LDS) supplied for a corresponding boost-worthy area portion of the image data. The controller board receives image data from the local dimming logic board, and gamma converts peripheral area data corresponding to a peripheral area of the boosted image data into converted image data using a gamma compensating conversion different from that used for image data of the backlight boosted area so that luminance of the peripheral area adjacent to the boosting area is decreased by use of a particular gamma compensating conversion in place of the normal or reference gamma conversion. The decreased luminance substantially counter compensates for an increased luminance due to light spreading into the peripheral area from the adjacent boosted area.