Display device and a driving method thereof

Patent metadata

Field	Value
Publication number	US-9612620-B2
Application number	US-201314105707-A
Country	US
Kind code	B2
Filing date	Dec 13, 2013
Priority date	Dec 18, 2012
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

Provided are a display device and a driving method thereof, the display device including: a display panel having a curvature radius; a driver driving the display panel; a timing controller controlling the driver; an image processor supplying an image signal to the timing controller; and an image corrector compressing or expanding the image signal in response to the curvature radius of the display panel.

First claim

What is claimed is:

1. A display device, comprising:
a display panel having a curvature radius;
a plurality of region control parts attached to respective regions of the display panel configured to control the curvature radius of the display panel;
a driver driving the display panel;
a timing controller controlling the driver;
an image processor supplying an image signal to the timing controller; and
an image corrector automatically compression-correcting or expansion-correcting the image signal in response to a change to the curvature radius of the display panel such that an edge portion of the image signal concavely recedes or convexly protrudes,
wherein the image corrector corrects the image signal to be convex when the display panel is bent to have a concave curvature radius,
corrects the image signal to be concave when the display panel is bent to have a convex curvature radius,
and does not correct the image signal when the display panel is flat,

wherein the image corrector:
receives, from the plurality of region control parts, curvature information representing a current curvature radius of the display panel;
retrieves, from a lookup table, a curvature coefficient corresponding to the current curvature radius of the panel; and
corrects the image signal based on the retrieved curvature coefficient.

2. The display device of claim 1 , wherein the image corrector comprises:
a lookup table storing curvature coefficients corresponding to curvature radii in the display panel;
a memory unit temporally storing the image signal; and
a correction unit reading the image signal from the memory unit, reading a curvature coefficient corresponding to the curvature radius of the display panel from the lookup table, and correcting and outputting the image signal based on the curvature coefficient.

3. The display device of claim 2 , wherein the image corrector corrects the image signal to be convex and inserts black data into a region of the image signal other than the convexly corrected region of the image signal when the display panel is bent to have a concave curvature radius, and corrects the image signal to be concave and inserts black data into a region of the image signal other than the concavely corrected region of the image signal when the display panel is bent to have a convex curvature radius.

4. The display device of claim 1 , further comprising a tilt sensor generating angle information corresponding to a tilt of the display panel, wherein the image corrector partially corrects the image signal based on the angle information supplied from the tilt sensor.

5. The display device of claim 4 , wherein the image corrector corrects the image signal displayed on the display panel based on the angle information such that at least one of upper, lower, left, and right portions of the image signal is expanded.

6. A driving method of a display device, the method comprising:
reading a curvature coefficient of a display panel;
reading an image signal, which is to be supplied to the display panel;
automatically compression-correcting or expansion-correcting the image signal based on a change to the curvature coefficient corresponding to the curvature of the display panel such that an edge portion of the image signal concavely recedes or convexly protrudes,
the compression-correcting or expansion-correcting comprising convexly correcting the image signal when the display panel is bent to have a concave curvature radius,
concavely correcting the image signal when the display panel is bent to have a convex curvature radius, and
not correcting the image signal when the display panel is flat;

receiving, from the plurality of region control parts, curvature information representing a current curvature radius of the display panel;
retrieving, from a lookup table, a curvature coefficient corresponding to the current curvature radius of the panel;
correcting the image signal based on the retrieved curvature coefficient; and
supplying the corrected image signal to the display panel and displaying the corrected image signal on the display panel.

7. The method of claim 6 , wherein the compression-correcting or expansion-correcting of the image signal further comprises:
receiving angle information corresponding to a tilt of the display panel; and
correcting the image signal based on the angle information such that at least one of upper, lower, left, and right portions of the image signal is expanded.

8. The method of claim 6 , wherein the compression-correcting or expansion-correcting of the image signal further comprises:
when the display panel is bent to have a concave curvature radius, correcting the image signal to be convex and inserting black data into a region of the image signal other than the convexly corrected region of the image signal; and
when the display panel is bent to have a convex curvature radius, correcting the image signal to be concave and inserting black data into a region of the image signal other than the concavely corrected region of the image signal.

9. The display device of claim 1 , wherein the plurality of region control parts are configured to control the curvature radius of the display panel by pushing or pulling the respective regions of the display panel, the plurality of region control parts including a central region control part attached to a central region of the display panel and one or more peripheral region control parts attached to the peripheral regions of the display panel.

10. The method of claim 6 , further comprising:
adjusting, by a plurality of region control parts attached to respective regions of the display panel, a curvature radius of the display panel by pushing or pulling the respective regions of the display panel.

11. The display device of claim 5 , wherein the image corrector corrects the image signal displayed on the display panel based on the angle information, by inverse phase correction, to compression-correct a portion of an image signal to be provided to a region of the display tilted closer to a viewing user, and expansion-correct a portion of the image signal to be provided to a region of the display tilted closer to the viewing user.

12. The method of claim 7 , correcting the image signal based on the angle information comprises:
correcting the image signal displayed on the display panel based on the angle information, by inverse phase correction, to compression-correct a portion of an image signal to be provided to a region of the display tilted closer to a viewing user, and expansion-correct a portion of the image signal to be provided to a region of the display tilted closer to the viewing user.

13. A display device, comprising:
a display panel having a curvature radius;
a plurality of region control parts attached to respective regions of the display panel configured to control the curvature radius of the display panel;
a driver driving the display panel;
a timing controller controlling the driver;
an image processor supplying an image signal to the timing controller; and
an image corrector automatically compression-correcting or expansion-correcting the image signal in response to a change to the curvature radius of the display panel such that an edge portion of the image signal concavely recedes or convexly protrudes,
wherein the image corrector corrects the image signal to be convex when the display panel is bent to have a concave curvature radius,
corrects the image signal to be concave when the display panel is bent to have a convex curvature radius,
and does not correct the image signal when the display panel is flat,
wherein the image correct

Assignees

• Lg Display Co Ltd

Inventors

• Bae Hyungguk

Classifications

• G06F1/1652 Primary

  the display being flexible, e.g. mimicking a sheet of paper, or rollable · CPC title

• G09G5/36 Primary

  characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory · CPC title

• G09G3/20

  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