Touch Display Panel Common Voltage Loop for Bright Line Prevention
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Solution Overview
Problem
Existing touch display panels face issues with dummy signal lines floating due to disconnection from the common voltage loop, leading to bright line defects and compromised display quality.
Innovation Solution
A touch display panel design featuring a connection structure between spaced portions of the common voltage loop and dummy signal lines, ensuring electrical connection and maintaining a common voltage, thereby preventing floating and bright line defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mask plates are shared for forming touch electrodes after cutting and grinding, then manufacturing cost is reduced, but the common voltage loop may have local disconnection causing dummy signal lines to float
Solution Approach 1:
The common voltage loop is divided into a first portion and a second portion that are spaced apart and adjacent to the opening region. This segmentation allows the loop to accommodate the opening while maintaining electrical connection through the connection structure, preventing disconnection issues that would occur with a continuous loop design.
Solution Approach 2:
A connection structure is introduced as an intermediary element between the first portion and second portion of the common voltage loop. This connection structure serves as a mediator to maintain electrical continuity across the opening region, ensuring that dummy signal lines remain connected to the common voltage loop despite the segmented design.
2Device complexity
If dummy signal lines are disconnected from the common voltage loop, then device complexity is reduced, but bright line defects occur due to floating signal lines
Solution Approach 1:
The connection structure ensures that the common voltage loop maintains a consistent potential throughout, including at the connection point between the first and second portions. This equipotential design prevents potential differences that would cause floating dummy signal lines and subsequent bright line defects in the display.
Solution Approach 2:
The connection structure maintains continuous electrical connection between the first portion and second portion of the common voltage loop, ensuring uninterrupted voltage supply to dummy signal lines. This continuity prevents the floating state that leads to bright line defects while maintaining a simplified signal line configuration.
Data Source
AI summary
The invention provides a touch display panel and a manufacturing method therefor. The touch display panel comprises a substrate; a display region disposed on the substrate; an opening region disposed on the substrate and adjacent to the display region; a plurality of touch electrodes disposed in the display region; a plurality of signal lines electrically connected to the touch electrodes; a common voltage loop surrounding the display region and having a first portion and a second portion spaced apart and adjacent to the opening region; a connection structure disposed between the first portion and the second portion; and a plurality of first dummy signal lines electrically connected to the connection structure; wherein the first portion is electrically connected to the second portion through the connection structure.