LCD Panel Charge Sharing Circuit Reduces Power Consumption
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Solution Overview
Problem
Current LCD panel driving methods consume excessive power due to parasitic capacitors in data lines, particularly when using the common voltage swing drive method, which results in high power consumption and long rising times.
Innovation Solution
The implementation of a charge sharing method in the LCD panel driving device, where the charge sharing common voltage driving circuit and signal driving circuit form a short circuit to neutralize charges in the common capacitor, reducing the need for high voltage changes and allowing data lines to be precharged, thereby reducing power consumption and rising time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common voltage swing drive method is used to drive LCD panels, then the liquid crystal can be prevented from dissolving, but the power consumption increases significantly and the rising time becomes very long
Solution Approach 1:
The patent applies preliminary action by precharging the data lines to a first voltage level before the actual image signal is applied. The charge sharing circuit precharges data lines to reduce the voltage swing required during normal operation, thereby reducing power consumption while maintaining liquid crystal stability through the alternating voltage swing mechanism
Solution Approach 2:
The patent changes the voltage parameter by introducing a first voltage level for precharging data lines before the main image signal is applied. This parameter change reduces the required voltage swing from the second voltage level, thereby reducing power consumption while maintaining the alternating voltage swing necessary for liquid crystal protection
2Reliability
If the common voltage swing drive method is used to drive LCD panels, then the liquid crystal can be prevented from dissolving, but the rising time becomes very long
Solution Approach 1:
The patent applies preliminary action by precharging the data lines to a first voltage level before the actual image signal is applied. This preliminary charging action reduces the voltage swing required during normal operation, thereby reducing the rising time while maintaining liquid crystal stability through the alternating voltage swing mechanism
Solution Approach 2:
The patent changes the voltage parameter by introducing a first voltage level for precharging data lines before the main image signal is applied. This parameter change reduces the required voltage swing from the second voltage level, thereby reducing the rising time while maintaining the alternating voltage swing necessary for liquid crystal protection
3Power
If high voltage changes are used to drive data lines, then the driving capability is sufficient, but the power consumption increases
Solution Approach 1:
The patent applies preliminary action by precharging the data lines to a first voltage level before the actual image signal is applied. This preliminary action reduces the voltage swing required during normal operation, thereby reducing power consumption while maintaining sufficient driving capability through the reduced voltage change from the precharged state
Solution Approach 2:
The patent changes the voltage parameter by introducing a first voltage level for precharging data lines before the main image signal is applied. This parameter change reduces the required voltage swing from the second voltage level, thereby reducing power consumption while maintaining sufficient driving capability
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 decreases power consumption by allowing data lines to be driven from a precharged state, enabling the use of transistors with weaker driving capability, saving costs and simplifying the circuit while reducing the rising time of voltages.
Implementation Method 1
the charge sharing common voltage driving circuit and the signal driving circuit form a short circuit at charge sharing, and the switch control circuit controls the switches to be on in order to neutralize charges stored in the common capacitor with charges on the data lines
Implementation Method 2
The common capacitor has a first terminal connected to the pixels and the charge sharing common voltage driving circuit through a common voltage node, and a second terminal connected to ground
Data Source
AI summary
An LCD panel driving method and device with charge sharing is disclosed. The LCD panel includes a plurality of switches, a plurality of data lines, a signal driving circuit for generating a plurality of image signals, a charge sharing common voltage driving circuit and a common capacitor having one end connected to the charge sharing common voltage driving circuit through a common voltage node. The method turns the switches on to thereby form the charge sharing common voltage driving circuit and the signal driving circuit as a short circuit, such that charges stored in the common capacitor flow into the data lines to drive the common voltage node to enter in an inverse phase state in order to sequentially turn the switches on and then off to accordingly sample the respective data lines.