Common Voltage Compensator for LCD Noise
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Solution Overview
Problem
In in-cell type touch screen liquid crystal display devices, the limited space for designing feedback lines makes it difficult to compensate for common voltage noise affecting the common electrodes, as each common electrode is connected to a common line, leaving insufficient room for additional feedback lines to accurately reflect and compensate for all noise.
Innovation Solution
The implementation of a liquid crystal display device with feedback lines that overlap the common electrodes, allowing the common voltage compensator to reflect voltage variations and compensate for noise by parasitic capacitance, even without being coupled to the common electrodes, thereby enabling effective noise reflection and compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If each common electrode is connected to a common line one to one in in-cell type touch screen devices, then the device structure is simplified and manufacturing is easier, but there is insufficient space to design feedback lines to compensate for common voltage noise
Solution Approach 1:
The feedback lines are positioned in the vertical dimension (overlapping the common electrodes in the vertical direction) rather than requiring horizontal space between common lines. This dimensional rearrangement allows feedback functionality to be integrated without increasing the planar area, resolving the contradiction between manufacturing simplicity and noise compensation capability
Solution Approach 2:
The feedback lines act as intermediaries that pick up voltage variations from the common electrodes through parasitic capacitance without requiring direct electrical connection. This intermediary mechanism enables noise reflection and compensation while maintaining the simple one-to-one connection structure between common electrodes and common lines
2Reliability
If feedback lines are added to compensate for common voltage noise, then common voltage compensation accuracy is improved, but the device complexity and space requirements increase
Solution Approach 1:
The feedback lines utilize parasitic capacitance formed naturally during device fabrication to couple with the common electrodes. This self-service mechanism eliminates the need for additional active components or complex circuitry, achieving noise compensation through the device's inherent electrical characteristics
Solution Approach 2:
The feedback lines serve multiple functions: they provide noise feedback for compensation, utilize parasitic capacitance for signal coupling, and integrate within the existing pixel structure without requiring separate dedicated components. This multi-functionality reduces overall device complexity while maintaining compensation accuracy
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 solution allows for comprehensive compensation of common voltage noise affecting the common electrodes, improving the accuracy and reliability of touch sensing and display performance in in-cell type touch screen devices.
Implementation Method 1
feedback lines that overlap the common electrodes, the plurality of feedback lines receiving a variation of the common voltage that is reflected by the common electrodes onto the plurality of feedback lines
Data Source
AI summary
A liquid crystal display device is disclosed, which may compensate for a common voltage by reflecting all of noises by which a plurality of common electrodes are affected. The liquid crystal display device comprises a liquid crystal display panel including a plurality of data lines, a plurality of gate lines crossing the data lines, and a plurality of pixels provided at crossing regions of the data lines and the gate lines and including pixel electrodes and common electrodes to which a common voltage is supplied, wherein a common electrode of the common electrodes is shared by two or more of the plurality of pixels. The liquid crystal display panel also includes a plurality of feedback lines that overlap the common electrodes, the plurality of feedback lines receiving a variation of the common voltage that is reflected by the common electrodes onto the plurality of feedback lines.