Dummy Gate Line Inverted Waveform LCD Panel
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Solution Overview
Problem
In liquid crystal display devices with in-cell type touch panels, uneven voltage distribution between driving and receiving electrodes leads to conspicuous striped patterns due to parasitic capacitance and voltage deviations, affecting image quality.
Innovation Solution
A dummy gate line with an inverted waveform is introduced, parallel to the gate lines and perpendicular to touch electrodes, to reduce common voltage variations and pixel voltage fluctuations, thereby eliminating striped patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If receiving electrodes are formed parallel to and overlap with gate lines to enable touch sensing, then touch sensing function is achieved, but parasitic capacitance is generated causing voltage deviation and striped patterns
Solution Approach 1:
An insulating film is introduced as an intermediary layer between the gate lines and receiving electrodes. This insulating film acts as a mediator that electrically isolates the two conductive elements, preventing parasitic capacitance formation while allowing the receiving electrodes to maintain their overlapping arrangement with gate lines for touch sensing functionality.
Solution Approach 2:
The harmful parasitic capacitance effect is extracted and eliminated by separating the gate lines and receiving electrodes through the insulating film. This extraction removes the unwanted electrical coupling between these elements while preserving their spatial arrangement needed for touch sensing.
2Measurement precision
If driving electrodes are arranged perpendicular to gate lines for optimal touch sensing, then touch sensing accuracy is improved, but vertical striped patterns become more conspicuous
Solution Approach 1:
The insulating film serves as a mediator that prevents electrical coupling between gate lines and driving electrodes arranged perpendicular to them. This eliminates the parasitic capacitance that causes voltage deviation and subsequent vertical striped patterns, while maintaining the perpendicular arrangement optimal for touch sensing accuracy.
3Reliability
If common voltage is supplied to both driving and receiving electrodes during image display, then electrode functionality is maintained, but uneven voltage distribution causes brightness patterns and stripes
Solution Approach 1:
The insulating film prevents parasitic capacitance formation that causes uneven voltage distribution. By electrically isolating the gate lines from the touch electrodes, it ensures that common voltage is distributed uniformly to both driving and receiving electrodes during image display, eliminating brightness patterns and stripes while maintaining electrode functionality.
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
The implementation of a dummy gate line with an inverted waveform effectively minimizes voltage variations and luminance differences across pixels, suppressing the appearance of striped patterns along touch electrodes perpendicular to the gate lines, enhancing image quality.
Implementation Method 1
parasitic capacitance may be generated between the gate lines and the driving electrodes TX and also between the gate lines and the receiving electrodes RX
Data Source
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AI summary
A liquid crystal display panel (100) and a liquid crystal display device having the liquid crystal display panel (100) are provided in which a dummy gate line (DGL) outputting a dummy gate pulse (DGP) having an inverted waveform of a gate pulse (GP) is formed to be parallel to gate lines (GL) outputting the gate pulses (GP) and to be perpendicular to touch electrodes supplied with a common voltage (Vcom).