US 11,817,029 B2
Screen saver controller, display device including the same, and method of driving the display device
Kihyun Pyun, Gwangmyeong-si (KR); and Heesook Park, Suwon-si (KR)
Assigned to Samsung Display Co., Ltd., Yongin-si (KR)
Filed by Samsung Display Co., LTD., Yongin-si (KR)
Filed on Jul. 26, 2022, as Appl. No. 17/874,232.
Claims priority of application No. 10-2021-0098677 (KR), filed on Jul. 27, 2021.
Prior Publication US 2023/0033713 A1, Feb. 2, 2023
Int. Cl. G09G 3/20 (2006.01)
CPC G09G 3/2007 (2013.01) [G09G 2310/027 (2013.01); G09G 2310/08 (2013.01); G09G 2320/0257 (2013.01); G09G 2320/0295 (2013.01); G09G 2320/046 (2013.01); G09G 2320/103 (2013.01); G09G 2330/022 (2013.01); G09G 2330/023 (2013.01); G09G 2360/16 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A screen saver controller comprising:
a load calculator configured to generate load data of an image represented by input image data;
a maximum gray level calculator configured to generate maximum gray level data of the image represented by the input image data; and
a screen saver data generator configured to determine a gain of a screen saver mode based on the load data and the maximum gray level data when the screen saver mode is operated and to generate screen saver data based on the input image data and the gain,
wherein:
the load calculator is configured to calculate a sum of all gray levels of Nth frame data, where N is a positive integer, and to calculate a load of the Nth frame data based on the sum of all the gray levels of the Nth frame data;
the maximum gray level calculator is configured to divide a display panel into a plurality of blocks, to calculate gray levels of the blocks, respectively, and to compare the gray levels of the blocks with each other to calculate a maximum gray level of the Nth frame data; and
the maximum gray level calculator is configured to compare a number of pixels having a highest gray level with a pre-stored reference number of pixels and to determine the highest gray level as the maximum gray level when the number of the pixels having the highest gray level is greater than or equal to the reference number of the pixels.