Gamma difference compensating apparatus, method of compensating gamma difference using the gamma difference compensating apparatus, and display system including the gamma difference compensating apparatus

Patent metadata

Field	Value
Publication number	US-2016196786-A1
Application number	US-201514697902-A
Country	US
Kind code	A1
Filing date	Apr 28, 2015
Priority date	Jan 2, 2015
Publication date	Jul 7, 2016
Grant date	—

Abstract

A gamma difference compensating apparatus includes a first gamma curve generating part, a front luminance measuring part, a front gamma calculating part, a second gamma curve generating part and a gamma compensating part. The first gamma curve generating part outputs a first gamma curve data. The front luminance measuring part measures a luminance of a left area from a front of the left area, measure a luminance of a right area from a front of the right area, and output a front luminance data. The front gamma calculating part outputs a front gamma data based on the front luminance data. The second gamma curve generating part applies the front gamma data to the first gamma data and output a second gamma curve data. The gamma compensating part compensates a gamma value of the left area and a gamma value of the right area.

First claim

What is claimed is:

1 . A gamma difference compensating apparatus comprising:
a photographing part configured to photograph an image displayed on a display panel and output a photograph data; an average luminance calculating part configured to output an average luminance data of the image based on the photograph data; a first gamma curve generating part configured to output a first gamma curve data of the image based on the average luminance data; a front luminance measuring part configured to measure a luminance of a left area from a front of the left area disposed at a left side compared to a center area of the display panel, measure a luminance of a right area from a front of the right area disposed at a right side compared to the center area of the display panel, and output a front luminance data; a front gamma calculating part configured to output a front gamma data based on the front luminance data; a second gamma curve generating part configured to apply the front gamma data to the first gamma data and output a second gamma curve data; and a gamma compensating part configured to compensate a gamma value of the left area and a gamma value of the right area such that the gamma value of the left area is the same as a gamma value of the center area and the gamma value of the right area is the same as the gamma value of the center area.

2 . The gamma difference compensating apparatus of claim 1 , wherein the second gamma curve generating part comprises:
an offset gamma calculating part configured to calculate a difference between a first gamma value of the left area included in the first gamma curve data and a front gamma value of the left area included in the front gamma data, calculate a difference between a first gamma value of the right area included in the first gamma curve data and a front gamma value of the right area included in the front gamma data, and output an offset gamma data; and a gamma curve generating part configured to apply the offset gamma data to the first gamma curve data and output the second gamma curve data.

3 . The gamma difference compensating apparatus of claim 2 , wherein the photographing part photographs the center area including a middle center area focused by the photographing part, an upper center area adjacent to an upper side of the display panel compared to the middle center area and a lower center area adjacent to a lower side of the display panel compared to the middle center area, the left area including a middle left area adjacent to a left side of the display panel compared to the middle center area, an upper left area adjacent to the left side of the display panel compared to the upper center area and a lower left area adjacent to the left side of the display panel compared to the lower center area, and a middle right area adjacent to a right side of the display panel compared to the middle center area, an upper right area adjacent to the right side of the display panel compared to the upper center area and a lower right area adjacent to the right side of the display panel compared to the lower center area.

4 . The gamma difference compensating apparatus of claim 3 , wherein the first gamma curve generating part outputs a first middle center gamma value of the middle center area, a first upper center gamma value of the upper center area, a first lower center gamma value of the lower center area, a first middle left gamma value of the middle left area, a first upper left gamma value of the upper left area, a first lower left gamma value of the lower left area, a first middle right gamma value of the middle right area, a first upper right gamma value of the upper right area and a first lower right gamma value of the lower right area.

5 . The gamma difference compensating apparatus of claim 4 , wherein the front luminance measuring part outputs a middle left front luminance value of the middle left area, an upper left front luminance value of the upper left area, a lower left front luminance value of the lower left area, a middle right front luminance value of the middle right area, an upper right front luminance value of the upper right area and a lower right front luminance value of the lower right area.

6 . The gamma difference compensating apparatus of claim 5 , wherein the front gamma calculating part outputs a middle left front gamma value of the middle left area, an upper left front gamma value of the upper left area, a lower left front gamma value of the lower left area, a middle right front gamma value of the middle right area, an upper right front gamma value of the upper right area and a lower right front gamma value of the lower right area.

7 . The gamma difference compensating apparatus of claim 6 , wherein the offset gamma calculating part calculates a difference between the first middle left gamma value of the middle left area and the middle left front gamma value of the middle left area to output a middle left offset gamma value of the middle left area, calculates a difference between the first upper left gamma value of the upper left area and the upper left front gamma value of the upper left area to output an upper left offset gamma value of the upper left area, calculates a difference between the first lower left gamma value of the lower left area and the lower left front gamma value of the lower left area to output a lower left offset gamma value of the lower left area, calculates a difference between the first middle right gamma value of the middle right area and the middle right front gamma value of the middle right area to output a middle right offset gamma value of the middle right area, calculates a difference between the first upper right gamma value of the upper right area and the upper right front gamma value of the upper right area to output an upper right offset gamma value of the upper right area, and calculates a difference between the first lower right gamma value of the lower right area and the lower right front gamma value of the lower right area to output a lower right offset gamma value of the lower right area.

8 . The gamma difference compensating apparatus of claim 7 , wherein the second gamma curve generating part applies the middle left offset gamma value of the middle left area to the first middle left gamma value of the middle left area to output a second middle left gamma value of the middle left area, applies the upper left offset gamma value of the upper left area to the first upper left gamma value of the upper left area to output a second upper left gamma value of the upper left area, applies the lower left offset gamma value of the lower left area to the first lower left gamma value of the lower left area to output a second lower left gamma value of the lower left area, applies the middle right offset gamma value of the middle right area to the first middle right gamma value of the middle right area to output a second middle right gamma value of the middle right area, applies the upper right offset gamma value of the upper right area to the first upper right gamma value of the upper right area to output a second upper right gamma value of the upper right area, and applies the lower right offset gamma value of the lower right area to the first lower right gamma value of the lower right area to output a second lower right gamma value of the lower right area.

9 . The gamma difference compensating apparatus of claim 8 , wherein the gamma compensating part compensates the second middle left gamma value of the middle left area such that the second middle left gamma value of the middle left area is the same as the first middle center gamma value of the middle center area, compensates the second upper left gamma value of the upper left area such that

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Kang-Hyun
• Moon Hoi-Sik
• Na Jong-Hee
• Jung Woo-Jin
• Chung Jae-Seob

Classifications

• G09G2320/0673

  for control of gamma adjustment, e.g. selecting another gamma curve · CPC title

• G09G2340/00

  Aspects of display data processing · 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

• G09G2360/145

  the light originating from the display screen · CPC title

• G09G3/3648

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title