Apparatus and method for correcting image distortion and curved display device including the same

Patent metadata

Field	Value
Publication number	US-2016133169-A1
Application number	US-201514928910-A
Country	US
Kind code	A1
Filing date	Oct 30, 2015
Priority date	Nov 10, 2014
Publication date	May 12, 2016
Grant date	—

Abstract

An apparatus for correcting image distortion may correct a luminance level of image data in accordance with a curvature of a curved display panel in a curved display device and a viewing distance of a viewer and display an image optimized for the curvature and the viewing distance on a full area of the curved display panel, whereby an image having no distortion may be provided to the viewer. The apparatus for correcting image distortion includes a virtual curved surface generator, a coordinate mapping unit, and a luminance converter.

First claim

What is claimed is:

1 . An apparatus for correcting image distortion, the apparatus comprising:
a virtual curved surface generator generating a virtual curved surface having a plurality of virtual pixels in accordance with a viewing distance and a curvature radius; a coordinate mapping unit mapping each of the plurality of virtual pixels of the virtual curved surface into each of a plurality of actual pixels of a curved display panel; and a luminance converter outputting image data of which luminance level is reconfigured for each of the plurality of actual pixels in accordance with a superimposed level of each of the plurality of virtual pixels superimposed on each of the plurality of actual pixels by mapping coordinates.

2 . The apparatus according to claim 1 , the apparatus further comprising:
a first sensor generating viewer position information by sensing a position of a viewer; and a position determination unit calculating the viewing distance based on a straight line distance between a screen of the curved display panel and the viewer, from the viewer position information.

3 . The apparatus according to claim 1 , the apparatus further comprising:
a second sensor generating curvature information by sensing a curvature of the curved display panel; and a curvature determination unit calculating the curvature radius of the curved display panel from the curvature information.

4 . The apparatus according to claim 1 , wherein each of the plurality of virtual pixels includes a plurality of tiles.

5 . The apparatus according to claim 1 , further comprising a memory storing the curvature radius.

6 . The apparatus according to claim 1 , wherein the luminance converter reconfigures a luminance level of each of the plurality of actual pixels in a unit of pixel of the curved display panel.

7 . The apparatus according to claim 1 , wherein the luminance converter reconfigures a luminance level of each of the plurality of actual pixels in a unit of sub pixel of the curved display panel.

8 . A method for correcting an apparatus for correcting image distortion, the method comprising the steps of:
generating a virtual curved surface having a plurality of virtual pixels in accordance with a viewing distance and a curvature radius; mapping coordinates of each of the plurality of virtual pixels of the virtual curved surface and each of a plurality of actual pixels of a curved display panel; reconfiguring a luminance level of each of the plurality of actual pixels in accordance with a superimposed level of each of the plurality of virtual pixels and each of the plurality of actual pixels, which are coordinate-mapped; and generating and outputting image data from an image signal in accordance with the reconfigured luminance level.

9 . The method according to claim 8 , wherein the step of generating the virtual curved surface includes generating the virtual curved surface similar to the curved display panel if the viewing distance is increased.

10 . The method according to claim 8 , wherein the step of generating the virtual curved surface includes generating the virtual curved surface similar to the curved display panel if the curvature radius is reduced.

11 . The method according to claim 8 , wherein the step of mapping the coordinates includes mapping the coordinates of each of the plurality of virtual pixels and each of a plurality of actual pixels by projecting the plurality of virtual pixels onto the curved display panel.

12 . The method according to claim 8 , wherein the step of reconfiguring the luminance level includes reconfiguring a luminance level of one of the virtual pixels as a luminance level of one of the actual pixels if the one of the actual pixels is superimposed on the one of the virtual pixels.

13 . The method according to claim 8 , wherein the step of reconfiguring the luminance level includes reconfiguring a luminance level of one of the actual pixels from a luminance level of each of two neighboring virtual pixels if the one of the actual pixels is superimposed on each of the two neighboring virtual pixels.

14 . The method according to claim 8 , wherein the viewing distance is calculated from a straight line distance from a screen of the curved display panel to a viewer in accordance with viewer position information provided from a sensor.

15 . The method according to claim 8 , wherein the curvature radius is calculated from curvature information of the curved display panel, which is provided from a sensor.

16 . A curved display device comprising:
a curved display panel; a data driver outputting a data signal to the curved display panel; and an image corrector generating image data obtained by correcting an image signal which is externally provided and outputting the generated image data to the data driver, wherein the image corrector includes: a virtual curved surface generator generating a virtual curved surface having a plurality of virtual pixels in accordance with a viewing distance and a curvature radius; a coordinate mapping unit mapping each of the plurality of virtual pixels of the virtual curved surface into each of a plurality of actual pixels of the curved display panel; and a luminance converter outputting image data of which luminance level is reconfigured for each of the plurality of actual pixels superimposed on each of the plurality of virtual pixels by coordinate mapping.

Assignees

• Lg Display Co Ltd

Inventors

• Park Jonghwan
• Shim Yeonshim
• Song Jihee
• Lee Sanglyn

Classifications

• G09G2320/068

  for control of viewing angle adjustment · CPC title

• G09G2354/00

  Aspects of interface with display user · CPC title

• G09G3/00

  Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes · CPC title

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G3/003 Primary

  to produce spatial visual effects · CPC title