Patent ID: 6958745

Claim:
A display device comprising: a pixel unit comprising: an array of pixels; and signal lines disposed in groups of columns of the array; level converting means comprising x stages of level shifters, wherein x is an integer of at least two, each level shifter for: when activated, converting x selection signals having a first voltage swing to selection signals having a second voltage swing, which are output, said x selection signals, corresponding to every x signal lines of the pixel unit, being input in a time-series manner, every x signal lines of the pixel unit being grouped; and when deactivated, outputting a signal having a voltage swing, which is latched; selecting means comprising a group of x select switches for sequentially selecting said every x signal lines in accordance with said x selection signals that were subjected to level conversion at the level converter to provide a display signal; and control means for, when partial display mode for displaying only part of a display screen is requested and when pixel writing is performed in a non-display region in which no displaying is performed: feeding an activating signal to the level shifter at a first stage when the select switch of the selecting means corresponding to the level shifter at a second stage is not selected; feeding an activating signal to a level shifter at one of the second to (x−1)th stages when the select switch of the selecting means corresponding to the level shifter at the previous stage of said one of said second to (x−1)th stages is selected and when the select switch of the selecting means corresponding to the level shifter at the following stage of said one of said second to (x−1)th stages is not selected; and feeding an activating signal to the level shifter at the xth stage when the select switch of the selecting means corresponding to the level shifter at the (x−1)th stage is selected.