Patent ID: 8866803
Filing Date: 2014-10-21
Classification: H04N

Abstract:
1. An image display device displaying an image by irradiating a projection plane with laser light while scanning the same in vertical and horizontal directions of said the projection plane, comprising: a laser driven based on a drive signal to output laser light having a quantity of light based on a gradation signal according to image data; a scanning position detection unit configured to detect a scanning position on said projection plane irradiated by said laser light; a vertical horizontal synchronization signal generation unit configured to generate and output a vertical synchronization signal and a horizontal synchronization signal designating a drive timing of said laser, based on said scanning position detected by said scanning position detection unit; a drive signal generation unit configured to generate a pixel synchronization signal according to generated said vertical and horizontal synchronization signals and said image data and output generated said pixel synchronization signal as said drive signal; a region detection unit configured to receive said generated vertical and horizontal synchronization signals and said pixel synchronization signal and detect whether or not a part corresponding to a prescribed region of said image is scanned on said projection plane by said laser light, based on the received synchronization signals, wherein the prescribed region of said image corresponds to a part of the projection plane; a quantity of light detection unit configured to detect a quantity of light of said laser light output by said laser; and a signal correction unit configured to correct said gradation signal only when the region detection unit detects that the part corresponding to the prescribed region of said image is scanned on the projection plane by said laser light, wherein when said region detection unit detects that the part corresponding to the prescribed region of said image is scanned on said projection plane by said laser light, said signal correction unit corrects said gradation signal, based on a difference between said quantity of light detected by said quantity of light detection unit and a prescribed quantity of light to be output from said laser for displaying the image corresponding to said prescribed region, and outputs corrected said gradation signal to said laser, wherein the region detection unit comprises: