LCD Panel Charge Sharing Switch Circuit Design
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Solution Overview
Problem
Liquid crystal displays (LCDs) face high power consumption during polarity reversal, which can be reduced by charge sharing, but existing methods like dot inversion driving require additional timing signals and have limited charge sharing time, affecting display quality.
Innovation Solution
A display panel design where charge sharing is performed directly on pixel circuits using a charge sharing switch connected between scanning lines, allowing charge sharing without additional timing signals, and utilizing a matrix arrangement of pixel units to prolong charge sharing time and enhance the charge sharing effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dot inversion driving method is adopted to inhibit flicker and integrate space, then display quality is improved, but power consumption increases due to high-frequency inversion measured in addressing time
Solution Approach 1:
The patent merges charge sharing functionality with the existing dot inversion driving structure by integrating a charge sharing switch into the pixel circuit. This allows charge sharing to be performed as part of the normal driving cycle without requiring separate additional timing signals, thereby reducing power consumption while maintaining flicker inhibition effects
Solution Approach 2:
The charge sharing switch is pre-configured in the pixel circuit during manufacturing, so that charge sharing capability is ready before operation. The switch is activated automatically based on the scanning signal timing, eliminating the need for additional control signals and reducing power consumption
2Use of energy by moving object
If charge sharing is implemented to reduce power consumption, then energy efficiency is improved, but charge sharing time is limited affecting display quality
Solution Approach 1:
The patent makes the charge sharing switch dynamically controllable based on the scanning signal timing. The switch remains conductive throughout the entire scanning period, allowing charge sharing to occur automatically without additional control signals. This dynamic control extends the effective charge sharing time while maintaining low power consumption
3Measurement precision
If additional timing signals are used to control charge sharing, then charge sharing control precision is improved, but device complexity increases
Solution Approach 1:
The charge sharing switch is designed to automatically respond to the scanning signal without requiring separate control signals. The switch is inherently controlled by the existing scanning timing, allowing the system to self-regulate charge sharing based on the natural driving cycle. This eliminates additional timing signal control while maintaining precise charge sharing timing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the quality of the display screen by extending charge sharing time and eliminating the need for additional timing signals, reducing power consumption and flicker phenomena.
Implementation Method 1
a charge sharing switch, where a control end of the charge sharing switch is connected to the first scanning line, a first end of the charge sharing switch is connected to the second pixel unit, and a second end of the charge sharing switch is connected to the third pixel unit
Data Source
AI summary
This application relates to a display panel. The display panel includes: a substrate, active switches are formed on the substrate; pixel units arranged in a matrix manner, where three of the pixel units form a pixel group, coupled to any data line and three scanning lines arranged in order, and the pixel group includes: a first pixel unit, coupled between a first scanning line and the data line; a second pixel unit, coupled between a second scanning line and the data line; and a third pixel unit, coupled between a third scanning line and the data line; and a charge sharing switch, where a control end of the charge sharing switch is connected to the first scanning line, a first end of the charge sharing switch is connected to the second pixel unit, and a second end of the charge sharing switch is connected to the third pixel unit.