HDR Display Current Control With Dual Grayscale Modes

The patent implements dynamic switching between low grayscale mode and high grayscale mode based on the luminance requirements of different image regions. The controller dynamically adjusts the number of grayscale levels used - utilizing fewer levels (e.g., 256 levels) for regions with low luminance requirements and more levels (e.g., 1024 levels) for regions requiring high luminance expression. This dynamic adaptation resolves the contradiction by ensuring high luminance expression only where necessary, thereby reducing overall power consumption while maintaining HDR image quality.

The patent applies different grayscale level configurations to different regions of the display based on local luminance requirements. By analyzing the image data and identifying regions with varying luminance demands, the system selectively applies high grayscale levels only to regions requiring superior luminance expression, while using lower grayscale levels in other regions. This local differentiation allows the display to achieve high overall luminance expression without uniformly increasing power consumption across the entire display.

The patent dynamically adjusts the output range of driving current based on the selected grayscale mode and image requirements. When operating in low grayscale mode, the system uses a reduced current output range to minimize power consumption. When high luminance expression is required, the system switches to high grayscale mode and expands the current output range accordingly. This dynamic current range adjustment resolves the contradiction by ensuring adequate luminance levels are available when needed while reducing power consumption during normal operation.

The patent changes the operational parameters of the driving circuit by switching between different grayscale modes, which fundamentally alters the relationship between driving current and luminance output. In low grayscale mode, the system operates with a compressed parameter range that reduces power consumption. In high grayscale mode, the system expands the parameter range to provide full luminance expression capability. This parameter transformation allows the system to resolve the contradiction between power consumption and luminance levels by adapting the operating parameters to the specific requirements of each display scenario.