LIQUID CRYSTAL DISPLAY DEVICE AND LIGHT SOURCE CONTROL METHOD

摘要

Disclosed is a liquid crystal display device comprising: a VA-IPS mode liquid crystal display panel (60); a backlight unit (70) with a built-in light source controlled by a PWM light control method; and a control unit (1) which controls the liquid crystal display panel and the backlight unit; wherein the control unit (1) acquires response speed data with respect to orientation change of the liquid crystal molecules (61M), and changes the duty of a PWM light control signal in accordance with the response speed data. In a case where the response speed (Vr) of liquid crystal molecules (61M) is relatively high, LEDs (71) are driven with the duty being set relatively low. In a case where the response speed (Vr) of the liquid crystal molecules (61M) is relatively low, the LEDs (71) are driven with the duty being set relatively high, and black insertion is not performed. The liquid crystal display device prevents image quality problems (ghost outlines) that tend to occur depending on the degrees at which the liquid crystal molecules tilt.