Display Driving Control for High-Contrast Sub-Pixel Power Reduction
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Solution Overview
Problem
Current display devices consume significantly higher power when displaying critical images compared to normal images, increasing design costs and limiting the application range of portable devices.
Innovation Solution
A driving method for display devices that adjusts sub-pixel grayscale values by calculating and comparing absolute differences between adjacent sub-pixels, and adjusting these values when the difference exceeds a threshold to reduce the likelihood of displaying critical images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display device displays a critical image with high contrast between adjacent sub-pixels, then the image quality and visual effect are improved, but the power consumption increases significantly
Solution Approach 1:
The patent applies preliminary action by detecting whether an image is a critical image before display, and pre-adjusting the grayscale values of sub-pixels to avoid the high power consumption state. The controller identifies critical images based on grayscale difference thresholds and modifies them in advance, preventing the power consumption issue from occurring during actual display.
2Use of energy by moving object
If the display device adjusts sub-pixel grayscale values to reduce power consumption, then the power consumption is reduced, but the image quality may be degraded
Solution Approach 1:
The patent applies local quality by selectively adjusting only the grayscale values of sub-pixels in critical images where the grayscale difference exceeds the threshold, while leaving other pixels unchanged. This localized adjustment approach maintains image quality in non-critical areas while reducing power consumption only where necessary.
3Device complexity
If the display device uses a simple driving method without grayscale adjustment, then the device complexity is reduced, but the power consumption increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the grayscale parameter of sub-pixels based on the detected image characteristics. The controller changes the grayscale values of specific sub-pixels when critical images are detected, using a simple threshold-based parameter modification approach that adds minimal complexity while effectively reducing power consumption.
Data Source
AI summary
A driving method for a display device, which has sub-pixels, scan lines and data lines, includes the steps of: receiving a frame data including multiple sub-pixel grayscale values corresponding to the sub-pixels; calculating an absolute difference value between a first sub-pixel grayscale value and a second sub-pixel grayscale value, wherein the first sub-pixel is electrically connected with a data line and one of two scan lines, the second sub-pixel is electrically connected with the data line and the other one of the two scan lines; and, when the absolute difference value is greater than or equal to a first threshold, adjusting at least one of the sub-pixel grayscale values of the first and second sub-pixels, wherein an absolute difference value between the adjusted sub-pixel grayscale values of the first and second sub-pixels is smaller than the absolute difference value between the first and second sub-pixel grayscale values.