Patent ID: 7934837
Filing Date: 2011-05-03
Classification: H04N

Abstract:
1. A projection display device which includes a light source for outputting light, a first-color light modulating device for modulating the light from the light source based on a first-color input signal, a second-color light modulating device for modulating the light from the light source based on a second-color input signal, and a third-color light modulating device for modulating the light from the light source based on a third-color input signal, comprising: three light quantity adjusting devices disposed on respective incidence sides of the light modulating devices and serving to adjust the quantity of light incident on the respective light modulating devices; and a controller unit for controlling the respective light quantity adjusting devices based on the respective input signals, the controller unit comprising: a first unit for calculating a light-quantity control coefficient by dividing the maximum value of the respective input signal values by the maximum value that the respective input signals can take on a per frame basis; and a second unit for controlling the respective light quantity adjusting devices for making the quantity of light passing through each of the light quantity adjusting devices equal to a value determined by multiplying the quantity of the incident light by the light-quantity control coefficient.