Dithering Section for Display Power Reduction
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Solution Overview
Problem
Existing display devices face challenges in reducing power consumption while maintaining image quality, particularly in low power consumption states like standby mode, where current techniques fail to effectively improve image quality without increasing power usage.
Innovation Solution
A display panel driver that employs dithering with a dither table where elements are unevenly distributed, allowing for gamma correction and contrast adjustment, reducing power consumption by optimizing the number of subpixels turned on and off, and using a column inversion driving method to maintain voltage balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power consumption is reduced by placing the display device in a low power consumption operation state, then power consumption is reduced, but image quality deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the dither table based on grayscale values. When the grayscale value is below a threshold, a first dither table is used; when it is above the threshold, a second dither table is used. This dynamic parameter adjustment allows the system to maintain image quality in low-power states by adapting the dithering characteristics to different brightness levels, thereby resolving the contradiction between power consumption reduction and image quality maintenance
Solution Approach 2:
The system dynamically switches between different dither tables based on the grayscale value of the image data. This dynamic adaptation enables the display device to optimize the balance between power consumption and image quality in real-time, allowing for improved image quality in low power states without requiring continuous high power operation
2Device complexity
If dithering is performed with uniform dither table elements, then processing is simplified, but image quality and contrast are insufficient
Solution Approach 1:
The patent implements local quality by using different dither tables for different grayscale ranges. The first dither table is used for lower grayscale values while the second dither table is used for higher grayscale values. This localized approach allows each dither table to be optimized for its specific grayscale range, improving overall image quality and contrast while maintaining manageable processing complexity through systematic organization
3Manufacturing precision
If more subpixels are turned on to improve image quality, then image quality improves, but power consumption increases
Solution Approach 1:
The patent changes the dithering parameters dynamically based on grayscale values to optimize the balance between image quality and power consumption. By using appropriate dither tables for different brightness levels, the system can achieve acceptable image quality with fewer subpixels activated in low-power states, thereby reducing overall power consumption while maintaining visual acceptability
Data Source
AI summary
Techniques for displaying a quality-improved image with reduced power consumption are provided. In one embodiment, a display panel driver is provided that includes a dithering section configured to receive first m-bit image data and configured to generate second image data by performing dithering on the first image data with n-bit dither values each selected from elements of a dither table, and a driver circuit configured to drive the source lines of a display panel in response to the second image data. In generating the second image data corresponding to first pixels belonging to a first pixel column, the dither values are selected from elements in a first column of the dither table, while the second image data corresponding to second pixels belonging to a second pixel column adjacent to the first pixel column, the dither values are selected from elements in a second column of the dither table.