Display Data Line Charge Sharing for LCD Power Reduction
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Solution Overview
Problem
The increasing resolution and frequency of liquid crystal display (LCD) panels lead to higher power consumption, posing a challenge for energy conservation in portable electronic devices.
Innovation Solution
A display apparatus with multiple scan lines, data line groups, and multiplexers, where data voltages with different polarities are alternately provided to the data line groups during scan line driving periods, and data lines with the same color and polarity on adjacent scan lines are electrically coupled to share charges during blank periods, reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution and upgrading frequency of LCD panels are increased, then the image quality and display performance are improved, but the power consumption of the LCD panels increases
Solution Approach 1:
The data lines are divided into multiple groups (first data line group, second data line group, etc.), with each group driven by separate multiplexers. This segmentation allows independent control and charging of different data line groups, enabling power savings by only charging selected groups rather than all data lines continuously.
Solution Approach 2:
The multiplexers alternately provide data voltages to different data line groups during scan line driving periods. During blank periods, data lines are electrically coupled to share charges periodically. This periodic alternating operation reduces the frequency of voltage transitions and charging operations, thereby reducing power consumption while maintaining display performance.
Solution Approach 3:
Data lines corresponding to pixels with the same color and polarity on adjacent scan lines are electrically coupled together during blank periods to share charges. This merging allows multiple data lines to share a common charge source, reducing the total charging current required and thus lowering power consumption.
2Use of energy by moving object
If data lines are electrically coupled to share charges during blank periods, then power consumption is reduced, but the device complexity increases due to additional multiplexers and switching elements
Solution Approach 1:
The multiplexers serve multiple functions: they selectively connect data driving chip output lines to different data line groups during scan line driving periods, and also enable electrical coupling between data lines during blank periods for charge sharing. This multi-functionality reduces the need for separate dedicated switching elements, thereby limiting the increase in device complexity.
Solution Approach 2:
The data lines themselves serve as charge storage elements during blank periods, electrically coupling to share charges without requiring external charge pumping circuits. The existing pixel electrodes and data line capacitances are utilized for charge sharing, avoiding additional active components and reducing overall device complexity.
Data Source
AI summary
A display apparatus and a driving method thereof are provided. A data driving chip provides a plurality of data voltages to a plurality of multiplexers through a plurality of output lines. When the display apparatus displays a pure gray pattern, the data voltages are alternately provided to a first data line group and a second data line group during a scan line driving period of each of the scan lines to make two adjacent pixels have different polarities. During a blank period, a plurality of data lines corresponding to a plurality of pixels having the same color and the same polarity on two adjacent scan lines are electrically coupled to each other through the data driving chip to share charges.