US 11,783,750 B2
Locally different gamma mapping for multi-pixel density OLED display
Sangmoo Choi, Palo Alto, CA (US); Janghoon Song, Seoul (KR); and Taesung Kim, Sunnyvale, CA (US)
Assigned to Google LLC, Mountain View, CA (US)
Appl. No. 17/260,871
Filed by Google LLC, Mountain View, CA (US)
PCT Filed Jul. 29, 2020, PCT No. PCT/US2020/043951
§ 371(c)(1), (2) Date Jan. 15, 2021,
PCT Pub. No. WO2021/030054, PCT Pub. Date Feb. 18, 2021.
Claims priority of provisional application 62/949,657, filed on Dec. 18, 2019.
Claims priority of provisional application 62/885,895, filed on Aug. 13, 2019.
Prior Publication US 2022/0309983 A1, Sep. 29, 2022
Int. Cl. G09G 3/20 (2006.01); G09G 3/3208 (2016.01)
CPC G09G 3/2007 (2013.01) [G09G 3/3208 (2013.01); G09G 2320/0233 (2013.01); G09G 2320/0276 (2013.01); G09G 2320/0673 (2013.01); G09G 2320/0686 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for driving an organic light emitting diode (OLED) display having a first area with a first pixel density and a second area with a second pixel density higher than the first pixel density, the method comprising:
receiving image content that specifies a grayscale value for both a first pixel in the first area and a second pixel in the second area;
providing, based on the grayscale value, a first voltage to the first pixel in the first area; and
providing, based on the grayscale value, a second voltage that is different from the first voltage to the second pixel in the second area, where the second voltage causes the second pixel to emit light less brightly than the first voltage causes the first pixel to emit light, wherein providing, based on the grayscale value, the second voltage that is different from the first voltage to the second pixel in the second area comprises:
determining a remapped grayscale value for the second pixel based on the grayscale value, wherein determining the remapped grayscale value for the second pixel based on the grayscale value comprises:
determining that a location of the second pixel is within the second area; and
in response to determining that the location of the second pixel is within the second area, determining the remapped grayscale value for the second pixel based on the grayscale value and a lookup table for the second area; and
providing the second voltage based on the remapped grayscale value.