Auxiliary Capacitance CCDI Drive for LCD Flicker and Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid crystal display technologies face challenges in reducing signal voltage amplitude and addressing flicker issues, particularly in achieving efficient power consumption and image quality while minimizing lateral crosstalk and line flicker.
Innovation Solution
The implementation of a capacitively-coupled dot inversion (CCDI) drive method, specifically the nH1V-CCDI drive, where the polarity is inverted every n scan lines and every other signal line, utilizing an auxiliary capacitance to superimpose voltage on pixel electrodes, thereby reducing signal voltage amplitude and improving power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarity inversion drive is executed every other scan line to counteract flicker, then line flicker is reduced, but signal voltage amplitude cannot be reduced sufficiently
Solution Approach 1:
The patent combines polarity inversion drive with capacitively-coupled drive by superimposing an auxiliary capacitance signal on the pixel electrode. This merging allows the system to achieve both flicker countermeasure and reduced signal voltage amplitude simultaneously, as the auxiliary capacitance provides the necessary voltage boost while maintaining the polarity inversion benefits.
Solution Approach 2:
The auxiliary capacitance acts as an intermediary element that couples between the signal line and the pixel electrode. It mediates the voltage relationship by storing and releasing charge, enabling the pixel electrode to reach higher voltages with lower signal voltage amplitudes from the signal line.
2Use of energy by moving object
If capacitively-coupled drive is employed to reduce signal voltage amplitude, then power consumption is reduced, but lateral crosstalk increases
Solution Approach 1:
The auxiliary capacitance is configured with specific local characteristics (capacitance value and positioning) that are optimized for each pixel. This local optimization ensures that the capacitively-coupled drive reduces power consumption while minimizing lateral crosstalk effects in each specific pixel region.
3Use of energy by moving object
If auxiliary capacitance is made approximately the same as pixel capacitance to reduce signal voltage amplitude, then power consumption is reduced, but voltage reachability is limited
Solution Approach 1:
The auxiliary capacitance signal is dynamically controlled through time-varying voltage application. The drive circuit applies voltage to the auxiliary capacitance in a controlled sequence that allows the pixel electrode to reach the necessary voltage levels while maintaining power efficiency, overcoming the limitations of static capacitance matching.
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 effectively reduces power consumption, minimizes lateral crosstalk and line flicker, and enhances image quality by applying a superimposed voltage that aligns with the polarity of display pixels, ensuring uniformity and reducing conflicts in signal polarity.
Implementation Method 1
a predetermined voltage is reached by superimposing an auxiliary capacitance signal to a pixel electrode via an auxiliary capacitance
Implementation Method 2
In the capacitively-coupled drive, a predetermined voltage is reached by superimposing an auxiliary capacitance signal to a pixel electrode via an auxiliary capacitance
Data Source
AI summary
According to one embodiment, an apparatus includes an array substrate including gate lines and auxiliary capacitance lines extending along a row, signal lines extending along a column, a semiconductor that intersects the gate line via an insulating layer and confronts the auxiliary capacitance line, a contact electrode for electrically connecting the semiconductor to the pixel electrode, a counter substrate, and a liquid crystal layer sandwiched between the substrates. In the pixels disposed side by side in a direction where the gate line extends, the positions of center of gravity of openings surrounded by the gate lines, the signal lines, the auxiliary capacitance line, and ends of the contact electrode are the same in a direction where the signal line extends.