Display Driver Charge Sharing for Power Reduction
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Solution Overview
Problem
As the resolution and operating frequency of electroluminescent displays increase, the power consumption of the display driver and electroluminescent display also rise, necessitating a reduction in power consumption without compromising performance.
Innovation Solution
A display device with a display driver that calculates average pixel data and selectively performs a charge sharing operation between data lines based on specific conditions, including differences in pixel data and reference differences, to reduce power consumption by optimizing voltage transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the resolution and operating frequency of the display panel are increased, then the display quality and performance are improved, but the power consumption of the display driver and electroluminescent display increases
Solution Approach 1:
The patent applies preliminary action by performing a charge sharing operation between data lines before data voltages are applied. The display driver calculates average data of adjacent pixels and selectively connects data lines through a multiplexer to share charges in advance, thereby reducing the power consumption required for subsequent voltage transitions while maintaining high resolution and operating frequency performance
2Use of energy by moving object
If charge sharing operation is performed between data lines, then power consumption is reduced, but the device complexity increases due to additional control circuits
Solution Approach 1:
The patent introduces a multiplexer as an intermediary component that selectively connects data lines based on calculated average data conditions. This intermediary enables the charge sharing operation without requiring complex direct control between individual data lines, thereby reducing power consumption while managing device complexity through a standardized switching mechanism
Data Source
AI summary
A display device including: a display panel including first and second data lines, a first and second pixels connected to first and second data lines in first pixel row, third and fourth pixels connected to the second data line in a second pixel row; and a display driver configured to receive image data including first, second, third and fourth pixel data for the first, second, third and fourth pixels, and provide first, second, third and fourth data voltages corresponding to the first, second, third and fourth pixel data to the first, second, third and fourth pixels through the first and second data lines, the display driver further configured to: calculate average data of the first and second pixel data; and selectively perform a charge sharing operation between the first and second data lines according to whether a first increase/decrease condition and a second increase/decrease condition are satisfied.