US 11,670,249 B2
Method of controlling backlight of display device and display device determining a demanded luminance value for backlight blocks
Kouichi Ooga, Kanagawa (JP)
Assigned to Shanghai Tianma Micro-Electronics Co., Ltd., Shanghai (CN)
Filed by Shanghai Tianma Micro-Electronics Co., Ltd., Shanghai (CN)
Filed on Nov. 8, 2021, as Appl. No. 17/521,274.
Claims priority of application No. JP2020-187346 (JP), filed on Nov. 10, 2020; and application No. JP2021-129689 (JP), filed on Aug. 6, 2021.
Prior Publication US 2022/0148528 A1, May 12, 2022
Int. Cl. G09G 3/34 (2006.01); G09G 3/36 (2006.01)
CPC G09G 3/3426 (2013.01) [G09G 3/36 (2013.01); G09G 2320/066 (2013.01); G09G 2320/0626 (2013.01); G09G 2320/0686 (2013.01); G09G 2330/021 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of controlling a backlight of a display device including a display panel and the backlight, the backlight including a plurality of backlight blocks, the display panel including display region blocks opposite to the plurality of backlight blocks in one-to-one correspondence, the method comprising:
for each backlight block of the plurality of backlight blocks:
determining a demanded luminance value demanded from each of a plurality of pixels in a plurality of display region blocks including a display region block opposite to the backlight block and one or more display region blocks adjacent to the opposite display region block to the backlight block, the demanded luminance value being determined based on a pixel luminance value of the pixel and a weight determined depending on a relation of a location of the pixel and a location of the backlight block; and
determining a highest value among the demanded luminance values for the backlight block to be a backlight luminance value for the backlight block,
wherein, as a bright spot having a highest pixel luminance value moves pixel by pixel within a first display region block opposite to a first backlight block toward a second display region block adjacent to the first display region block and opposite to a second backlight block adjacent to the first backlight block, the demanded luminance value demanded from the bright spot for the second backlight block increases,
wherein, when the bright spot reaches an edge of the first display region block adjacent to the second display region block, the demanded luminance values demanded from the bright spot for the first and second backlight blocks become the same, and the demanded luminance value demanded from the bright spot for a third backlight block, which is adjacent to the first backlight block on an opposite side of the second backlight block, becomes zero, and
wherein, when the bright spot moves from the edge of the first display region block to an edge of the second display region block, the demanded luminance values from the bright spot for the first and second backlight blocks remain the same.