Liquid crystal display device

Abstract

Disclosed is a liquid crystal display device provided with: a liquid crystal panel (1) which performs switching between 2D display and 3D display; a digital gamma correction unit (21) which changes the gamma characteristic of a video signal to be inputted to the liquid crystal panel (1); a backlight (2) which uses an LED irradiating the liquid crystal panel (1) from a back surface thereof as a light source; and a backlight drive unit (13) which controls the drive of the backlight (2). When the liquid crystal panel (1) performs the 3D display, the backlight drive control circuit (13) controls the drive of the backlight such that the brightness of the LED becomes higher than that at the time of the 2D display, and the digital gamma correction unit (21) changes the gamma characteristic of the inputted video signal such that the brightness on the low-gradation side becomes lower than the brightness at the time of the 2D display and the brightness on the high-gradation side becomes higher than the brightness at the time of the 2D display. Consequently, the brightness felt by a user can be increased without increasing the number of LEDs.

Description

technical field [0001] The present invention relates to a liquid crystal display device capable of 3D (dimension) display. Background technique [0002] In recent years, liquid crystal displays capable of 3D (dimension: dimensional) display in addition to 2D (dimension: dimensional) display have been disclosed. [0003] However, in the 3D display of the liquid crystal display, its brightness is generally lower than that of the 2D display. In particular, a 3D liquid crystal display using a time-division driving method (frame sequential method) using active shutter glasses has a problem that the luminance is significantly lower than that of a 2D liquid crystal display. [0004] Specifically, in a 3D liquid crystal display, video for the right eye and video for the left eye with different parallaxes are alternately displayed on the liquid crystal panel, for example, every 1 / 120 second, and in synchronization with this, the liquid crystal is alternately opened and closed each t...

AI Technical Summary

Problems solved by technology

However, the liquid crystal active shutter glasses are only opened on one side at a time (the opening time on the time axis is 50% or less), and the liquid crystal active shutter glasses are observed (usually, the transmittance is about 80 to 90%). The lighting ratio (duty ratio) of the backlight source scanned by the backlight source is ideally 50% or less, so that the brightness passing through the glasses is reduced.

Images