Display Panel Charge Sharing Control for Power Reduction
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Solution Overview
Problem
High differences in data signals between adjacent pixels in display panels lead to increased power consumption and heat generation, as well as insufficient charging rates, which deteriorate display quality.
Innovation Solution
A method and apparatus for driving a display panel that involves comparing previous and present line data to generate a charge sharing enable signal, selectively applying charge sharing using a charge sharing voltage, and outputting the data voltage to the pixel, thereby reducing power consumption and heat while improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If data signals swing between high and low levels to display specific image patterns, then display quality is improved, but power consumption increases and heat is generated
Solution Approach 1:
The patent applies charge sharing periodically based on image patterns. The charge sharing operation is activated when specific conditions are detected (such as when adjacent pixels have similar grayscale values or when displaying specific patterns like black backgrounds), rather than continuously. This periodic activation reduces power consumption while maintaining display quality when needed.
Solution Approach 2:
The patent changes the voltage parameter dynamically by applying charge sharing voltage selectively. When the charge sharing enable signal is activated, a charge sharing voltage (typically AVDD or GND) is applied to the data line to share charge between adjacent pixels. This parameter change allows the system to optimize power consumption based on the actual display content.
2Illumination intensity
If data signals swing between high and low levels to display specific image patterns, then display quality is improved, but heat generation increases
Solution Approach 1:
The charge sharing operation is performed periodically based on detected image patterns rather than continuously. The data driver controller activates charge sharing only when specific conditions are met (such as adjacent pixels having similar grayscale values), reducing the frequency of high-current operations and thereby reducing heat generation in the data driver circuitry.
3Speed
If charge sharing is applied to all pixels, then charging rate of pixel voltage is improved, but power consumption increases
Solution Approach 1:
The patent applies charge sharing locally to specific pixels or pixel groups based on their grayscale values and adjacent pixel relationships, rather than uniformly to all pixels. The data driver controller identifies regions where charge sharing would be beneficial (such as areas with similar grayscale values or specific pattern boundaries) and applies charge sharing only in those local regions, optimizing both charging rate and power consumption.
Solution Approach 2:
The charge sharing operation is activated periodically based on detected image patterns and pixel characteristics. The system monitors grayscale values and activates charge sharing only when conditions indicate it would improve charging rate without unnecessary power waste, such as when adjacent pixels have similar values or when specific display patterns are detected.
4Use of energy by moving object
If data signals are output without charge sharing, then power consumption is reduced, but charging rate of pixel voltage becomes insufficient
Solution Approach 1:
The system operates in a hybrid mode where charge sharing is activated periodically based on detected image patterns and pixel characteristics. When conditions indicate insufficient charging rate (such as high grayscale values requiring more charge), the charge sharing enable signal activates additional charge sharing operations. This ensures power consumption is reduced during normal operation while maintaining adequate charging rate when needed.
Data Source
AI summary
A method of driving a display panel includes comparing a previous line data and a present line data to generate a charge sharing enable (EQ) signal indicating whether or not a charge sharing is to be applied to a pixel; selectively applying the charge sharing to the present line data utilizing a charge sharing voltage according to the EQ signal to generate a data voltage; and outputting the data voltage to the pixel.