Patent ID: 8823631

Claim:
A liquid crystal display, comprising: a Twisted Nematic (TN) liquid crystal panel and a backlight for emitting light from behind the liquid crystal panel, and varying transmission of each pixel in the liquid crystal panel based on a video signal, thereby displaying an image with the transmitted light that is transmitted through each pixel of the liquid crystal panel; a video signal reception section for receiving the video signal contained in a Transport Stream of digital television broadcasting signal; a signal input detection section for detecting the video signal based on a table which records channel numbers contained in the Transport stream; a luminance control section for controlling the luminance of the backlight with Pulse Width Modulation (PWM) control for varying a duty ratio of a pulse signal; a control section for outputting a control signal to the luminance control section so that the luminance control section varies the duty ratio of the pulse signal; a table for storing a luminance control range that has a range of value which can be set by an operation input; wherein when the video signal is detected by the signal input detection section, the control section outputs the control signal so that the luminance control section controls the luminance of the backlight based on the luminance control range and when the video signal is not detected by the signal input detection section, the control section outputs the control signal so that the luminance control section reduces the value of the luminance of the backlight lower than the minimum value of the luminance control range.