Video display device

A video display device that receives video signals from an even number of video signal lines with an identical frame period and is capable of displaying a stereoscopic image based on left-eve and right-eve images included in the video signals, comprising:

• a video display drive unit that outputs the video signals inputted from the video signal lines;
• a video display unit that has a plurality of display areas and displays the left-eye image and the right-eye image by modulating light incident from a back of the video display unit in response to the inputted video signals;
• a light-emitting device that has a plurality of light emission areas for the respective display areas and illuminates the video display unit with light from the back of the video display unit;
• a light-emitting device drive unit that drives the light-emitting device;
• and
• a light-emitting device control unit that determines a light-emission intensity value of the light emission area based on the left-eye image and the right-eye image, and controls and operates the light-emitting device drive unit at an operating frequency lower than an operating frequency of the video display unit,
• wherein the light-emitting device control unit comprises:
• a selection unit that generates a video signal by alternately selecting the video signals inputted from the even number of video signal lines and outputs the video signal from a smaller number of video signal lines than the even number of video signal lines at an operating frequency lower than the operating frequency of the video display unit, and
• a local control unit that detects a video feature quantity of the video signal from the selection unit and determines the light-emission intensity value of the light emission area according to the video feature quantity.

A video display device that receives video signals from an even number of video signal lines with an identical frame period and is capable of displaying a stereoscopic image based on left-eye and right-eye images included in the video signals, comprising:

• a video display drive unit that outputs the video signals inputted from the video signal lines;
• a video display unit that has a plurality of display areas and displays the left-eye image and the right-eye image by modulating light incident from a back of the video display unit in response to the inputted video signals;
• a light-emitting device that has a plurality of light emission areas for the respective display areas and illuminates the video display unit with light from the back of the video display unit;
• a light-emitting device drive unit that drives the light-emitting device;
• and
• a light-emitting device control unit that determines a light-emission intensity value of the light emission area based on the left-eve image and the right-eye image, and controls and operates the light-emitting device drive unit at an operating frequency lower than an operating frequency of the video display unit,
• wherein the light-emitting device control unit comprises:
• a plurality of local control units, each of which detects a video feature quantity of the video signal from the video signal of the video signal line, determines the light-emission intensity value of the light emission area according to the video feature quantity, and outputs the light-emission intensity value;
• and
• one of a combination unit and a selection unit that output a signal to the light-emission device drive unit based on the signals from the plurality of local control units at an operating frequency lower than the operating frequency of the video display unit.