DISPLAY DEVICE, PORTABLE TELEPHONE SET WITH THE SAME, AND PORTABLE TERMINAL DEVICE

摘要

PURPOSE: A display apparatus, a portable telephone with the same and a portable terminal apparatus are provided to improve the luminance and chrominance in the display panel by controlling the backlight. CONSTITUTION: A backlight equipped with a light source is controlled so that the light source begins to illuminate in the rising stage of the transmissivity of a pixel where a video signal is written nearly in the middle of a write period wherein the video signal is written and finishes illuminating in the falling stage of the transmissivity of the pixel. Herein, the backlight is controlled, specially, so that £absolute value of M2-M1 Twrite|/£M0(T2-T1)|<=0.92, where T1 is the point of time when the light source begins to illuminate. M1 is the transmissivity of a display area where the video signal is written at the point T1 of time, and T2 is the point of time when the light source finishes illuminating. M2 is the transmissivity of the display area where the video signal is written at the point T2 of time, and M0 is the maximum value of the transmissivity of the display area of an optical modulating element when the light source is illuminating.