Line-Sequential Luminance Gain Control for Power Management
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Solution Overview
Problem
Display devices, particularly organic EL devices, face challenges in maintaining high image quality while reducing power consumption, especially when using automatically brightness limit (ABL) functions, which can cause unnatural perceptions if not managed effectively.
Innovation Solution
A display device and image processing method that determine a gain based on a partial image within a frame image, correcting pixel luminance information for the process target line, allowing for efficient power management and enhanced image quality by adjusting luminance dynamically during line sequential scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If ABL function is used to control display luminance and decrease power consumption, then power consumption is reduced, but image quality deteriorates causing unnatural perception
Solution Approach 1:
The patent segments the frame image into multiple line groups and processes each line group independently with different gain values. This allows selective luminance adjustment for specific regions (e.g., header, footer, content areas) rather than uniform adjustment across the entire screen, thereby maintaining image quality in critical areas while reducing power consumption in less important areas.
Solution Approach 2:
The patent applies different gain values to different line groups within the same frame, creating local quality variations. By assigning higher gain values to line groups containing important visual information (such as text or key content) and lower gain values to less important areas, the system maintains high image quality where needed while achieving power savings in other regions.
2Use of energy by stationary object
If gain is determined based on entire frame image, then power consumption decreases, but image quality deteriorates due to loss of local detail
Solution Approach 1:
The patent divides the frame image into multiple line groups and calculates gain values for each line group separately based on local luminance statistics. This segmentation approach enables the system to maintain accurate luminance control for each region while still achieving overall power consumption reduction through selective adjustment.
Solution Approach 2:
The patent applies luminance adjustment selectively to specific line groups rather than uniformly to the entire frame. By applying correction only where needed (partial action) and using different correction intensities for different regions, the system maintains luminance accuracy in critical areas while achieving power savings through reduced correction in other areas.
Data Source
AI summary
An image processing device includes: a gain calculation section determining a gain, on the basis of a first partial image in a first frame image that includes a process target line; and a correction section correcting pixel luminance information regarding the process target line, on the basis of the gain.