Display Brightness Control via Sub-Frame Segmentation
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Solution Overview
Problem
Existing display control systems with limited image memory capacity face challenges in implementing Peak Luminance Enhancement (PLE) control, leading to delayed brightness adjustments and excessive power consumption due to sudden changes in image brightness, particularly when transitioning from dark to bright images.
Innovation Solution
A display control apparatus that calculates the average brightness of a picture signal multiple times within a frame period, allowing for real-time brightness control by dividing the frame into sub-frames and adjusting the brightness based on the calculated average luminance for each sub-frame, thereby preventing excessive peak current flow and maintaining efficient power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an image memory for a plurality of frames is used to implement PLE control, then brightness adjustment accuracy is improved, but device complexity and memory capacity requirements increase
Solution Approach 1:
The patent divides the frame period into multiple sub-frame periods and calculates average brightness separately for each sub-frame. This segmentation allows PLE control to be implemented with a single-frame memory capacity while maintaining brightness adjustment accuracy, as each sub-frame's brightness is controlled based on its own average brightness calculation rather than requiring multi-frame memory storage
Solution Approach 2:
The patent transitions from a time-based multi-frame memory approach to a spatial-temporal hybrid approach by dividing the frame into sub-frames and calculating brightness metrics for each sub-frame independently. This dimensional transformation allows the system to achieve PLE control functionality without increasing memory capacity, as the brightness information is processed in the temporal dimension within each frame rather than requiring additional spatial memory resources
2Device complexity
If brightness control is delayed due to limited memory capacity, then power consumption increases, but device complexity is reduced
Solution Approach 1:
The patent performs preliminary brightness control calculations by dividing the frame into sub-frames and calculating average brightness for each sub-frame in advance. This preliminary action allows the backlight to be adjusted promptly based on the calculated brightness metrics without delay, thereby reducing power consumption while using only single-frame memory capacity
Solution Approach 2:
The patent implements periodic brightness control by calculating average brightness for each sub-frame period and adjusting the backlight accordingly. This periodic action ensures that brightness adjustments are made frequently and timely throughout the frame period, preventing power consumption increases that would result from delayed adjustments, while maintaining simple memory requirements
3Device complexity
If average brightness is calculated only once per frame, then processing complexity is reduced, but brightness control responsiveness deteriorates
Solution Approach 1:
The patent segments the frame period into multiple sub-frame periods and calculates average brightness for each sub-frame separately. This segmentation increases brightness control responsiveness by providing more frequent brightness metrics without excessive processing complexity, as each sub-frame calculation is independent and can be performed efficiently
Solution Approach 2:
The patent performs partial brightness calculations by computing average brightness only for each sub-frame rather than requiring complex full-frame analysis. This partial action approach provides timely brightness control responsiveness with reduced processing complexity compared to comprehensive frame-wide calculations
Data Source
AI summary
An inputted picture signal is stored in an image memory into which a picture signal for at least one frame period can be written, while rewriting the memory. At a plurality of timings within one frame period, an average brightness calculation unit calculates an average brightness from the picture signal written into the image memory, and a brightness control unit performs brightness control of the picture signal read from the image memory based on the calculated average brightness.