US 2003/0142116 A1 · Projection-type display device having distortion correction function

Abstract

A projection-type display device having a liquid crystal panel is provided which is capable of correcting for distortions in horizontal and vertical directions even when the liquid crystal panel is placed in a position other than such a position that the liquid crystal panel is right opposite to the screen. To display a video for correcting for distortions on a liquid crystal panel, location data of a video signal to be output to the liquid crystal panel is stored in advance into an address storing memory as address data of a frame memory. Address data of the frame memory being stored in the address storing memory is read in synchronization with a timing signal and, based on a result from the reading, a video signal is read from a corresponding address of the frame memory and a video based on the video signal is displayed on the liquid crystal panel. Thus, by displaying the video for correcting for distortions on the liquid crystal panel, correction for distortions can be achieved.

Claims12

Dependent claims

A projection-type display device provided with a display panel device and having a function of correcting for distortions in horizontal and vertical directions occurring when a video displayed in response to a video signal on said display panel device is projected on a screen, comprising:

a frame memory to store said video signal;
an address generating means to generate an address data of said frame memory on which said video signal is to be written based on a synchronous signal in horizontal and vertical directions;
an address storing memory to store, in advance, location data of said video signal to be displayed on said display panel device in horizontal and vertical directions as address data of said frame memory in order to display a video for correcting for said distortions on said display panel device;
a timing producing means to produce a timing signal in horizontal and vertical directions used to drive said display panel device;
and
wherein, based on address data of said frame memory read from said address storing memory in synchronization with said timing signal, said video signal is read from a corresponding address of said frame memory and a video corresponding to said video signal having been read is displayed on said display panel device.

3 more elements

a frame memory to store said video signal;
an address generating circuit to generate an address data of said frame memory on which said video signal is to be written based on a synchronous signal in horizontal and vertical directions;
an address storing memory to store, in advance, location data of said video signal to be displayed on said display panel device in horizontal and vertical directions as address data of said frame memory in order to display a video for correcting for said distortions on said display panel device;
a timing producing circuit to produce a timing signal in horizontal and vertical directions used to drive said display panel device;
and
wherein, based on address data of said frame memory read from said address storing memory in synchronization with said timing signal, said video signal is read from a corresponding address of said frame memory and a video corresponding to said video signal having been read is displayed on said display panel device.

3 more elements

Dependencies are inferred from the claim text.

Projection-type display device having distortion correction function

Life of this patent

Projection-type display device having distortion correction function

Life of this patent

Abstract

Claims12