OLED Display Luminance Control via Local Image Load Segmentation
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Solution Overview
Problem
Current OLED display technologies face challenges in reducing power consumption while maintaining image quality, as the luminance of the display panel is often controlled uniformly, leading to potential deterioration in image quality based on the displayed pattern of image data.
Innovation Solution
A display device and driving method that include an image data compensator to calculate global and local image loads, adjusting peak luminance by dividing the image into partitions and setting local image loads as average values when data is sequential, thereby controlling luminance across different areas to reduce power consumption and improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the luminance of the display panel is controlled uniformly, then power consumption is reduced, but image quality deteriorates according to the displayed pattern
Solution Approach 1:
The display panel is divided into multiple local regions, and image load is calculated separately for each region rather than uniformly for the entire panel. This allows different luminance control strategies to be applied to different regions, reducing power consumption in low-load regions while maintaining image quality in high-load regions.
Solution Approach 2:
Different luminance compensation is applied to different local regions based on their specific image load characteristics. Regions with higher image load receive greater luminance compensation to maintain image quality, while regions with lower image load receive reduced compensation to save power, achieving local optimization rather than uniform control.
2Use of energy by stationary object
If the power source voltage level is controlled based on global image load, then average power consumption is reduced, but image quality may deteriorate in specific regions
Solution Approach 1:
The global image load calculation is segmented into multiple local image load calculations for different regions of the display panel. This allows the system to identify high-load and low-load regions separately, applying appropriate luminance compensation to each region rather than using a single global control strategy that may compromise local image quality.
Solution Approach 2:
The control strategy transitions from one-dimensional global image load control to two-dimensional local region control. By adding the spatial dimension of local region analysis, the system can simultaneously optimize power consumption at the global level while maintaining image quality at the local level through region-specific luminance compensation.
Data Source
AI summary
A display device includes: a plurality of pixels; an image data compensator for outputting compensated image data by controlling peak luminance of image data; and a data driver for transmitting the compensated image data to the plurality of pixels, wherein the image data compensator is configured to control luminance of the image data by using a global image load of an image in its entirety, a plurality of first local image loads of a plurality of the first partitions generated by dividing the image by a first unit area, and a plurality of second local image loads of a plurality of second partitions generated by dividing the image by a second unit area. Power consumption of the display device can be reduced, and image quality is improved by improving peak luminance and contrast of the display image.