SOURCE DRIVER IC CHIP

摘要

A source driver IC chip, designed to prevent flicker in images displayed on a display panel while suppressing power consumption and heat generation, includes: a reference gradation voltage generating part (220) configured to generate a reference gradation voltage based on a first or second gamma characteristic of the display panel, using first and second power supply voltages (VH) and (VL) inputted through first and second external terminals (PA2, PA3); and a third external terminal (PA4) for externally outputting said reference gradation voltage. The source driver IC chip further includes first and second gradation voltage generating parts configured to generate first and second gradation voltages respectively, using a reference gradation voltage based on a first gamma characteristic inputted through a fourth external terminal and a reference gradation voltage having a second gamma characteristic inputted through a fifth external terminal respectively.

主权项

1. A video display device comprising a first substrate having a power supply circuit configured to generate a power supply voltage, a second substrate constituting a display panel, a first source driver IC chip configured to generate a driving pulse having a first and a second gradation voltage corresponding to a brightness level represented by a video signal to apply the generated driving pulse to a first source line group of a plurality of source lines of said display panel, and a second source driver IC chip configured to generate a driving pulse having a first and a second gradation voltage corresponding to a brightness level represented by a video signal to apply the generated driving pulse to a second source line group of said plurality of source lines of said display panel,
wherein each of said first and second source driver IC chips includes: a reference gradation voltage generating part configured to generate a reference gradation voltage based on a first or a second gamma characteristic to output the generated reference gradation voltage through a first external terminal, a first gradation voltage generating part configured to generate said first gradation voltage based on a voltage inputted through a second external terminal; and a second gradation voltage generating part configured to generate said second gradation voltage based on a voltage inputted through a third external terminal, wherein a first wiring layer of said first substrate has a first reference gradation voltage supply line formed thereon, and a second wiring layer of said first substrate has a second reference gradation voltage supply line formed thereon, wherein said first external terminal of said first source driver IC chip, said second external terminal of said first source driver IC chip and said second external terminal of said second source driver IC chip are connected to said first reference gradation voltage supply line, and wherein said third external terminal of said first source driver IC chip, said first external terminal of said second source driver IC chip and said third external terminal of said second source driver IC chip are connected to said second reference gradation voltage supply line.