Dummy Line Common-Voltage Layout for Vertical Band Suppression
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Solution Overview
Problem
In-cell type touch display devices experience a vertical band phenomenon due to dummy lines, which affect the display quality by causing defects at the boundaries of touch blocks.
Innovation Solution
The dummy line is electrically connected to the common electrode, allowing the common voltage to be applied during the display period, thereby stabilizing the voltage and preventing the vertical band phenomenon by forming an electric field that corrects the disclination in the liquid crystal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a dummy line is used in the non-opening area, then the liquid crystal alignment is maintained, but a vertical band phenomenon occurs at the boundary of touch blocks due to electric field effects
Solution Approach 1:
The patent applies a compensation voltage to the dummy line to convert the harmful electric field effect (which causes vertical band phenomenon) into a beneficial effect. By intentionally applying a voltage that generates an electric field opposite to the harmful one, the disclination in liquid crystal is corrected and the vertical band defect is eliminated, thus converting the harmful electric field effect into a beneficial alignment correction mechanism
2Ease of manufacture
If the dummy line is electrically isolated, then manufacturing is simplified, but voltage instability occurs affecting display quality
Solution Approach 1:
The patent introduces a compensation voltage as an intermediary element that mediates between the dummy line and the common electrode. This compensation voltage acts as a mediator to transfer the necessary electric field effect from the common electrode to the dummy line, enabling voltage stabilization and display quality improvement while maintaining the structural simplicity of the dummy line configuration
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 effectively prevents the vertical band-like defect caused by the electric field effect in the dummy line, improving the display quality by ensuring stable voltage distribution across the dummy line.
Implementation Method 1
preventing the vertical band phenomenon by forming an electric field that corrects the disclination in the liquid crystal
Data Source
AI summary
A display device including a pixel electrode disposed in an opening area; a common electrode of which at least a region is disposed to be overlapped with the pixel electrode; a gate line extending along a first direction in a non-opening area surrounding the opening area and transmitting a gate signal to the pixel electrode; a data line extending along a second direction different from the first direction in the non-opening area, and transmitting a data signal to the pixel electrode; and a dummy line disposed to be overlapped with the data line in the non-opening area and electrically connected to the common electrode.