Touch-Sensing Display Panel Bridge Line Design
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Solution Overview
Problem
Capacitive touch-sensing panels face issues with electrostatic discharge during production and usage, leading to damage of touch-sensing circuits and poor yield, particularly in On-cell/In-cell type panels, and conventional designs that improve yield affect the visual effect by making bridge lines more noticeable.
Innovation Solution
The design features a touch-sensing display panel with first and second sensing series, where neighboring touch pads are connected through bridge lines that are at least 140 micrometers apart, using transparent conductive materials and dielectric patterns to ensure electrical insulation and minimize visual impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two parallel metal bridge lines are used to connect neighboring touch pads, then the yield is improved by preventing electrostatic discharge damage, but the visual effect is deteriorated because the bridge lines become noticeable
Solution Approach 1:
The patent changes the optical properties of the bridge lines by using transparent conductive materials instead of traditional metal bridge lines. This makes the bridge lines invisible or hardly perceivable to users, thereby improving the visual effect while maintaining the electrical connection function for electrostatic discharge protection
Solution Approach 2:
The patent uses composite material structures where transparent conductive materials are combined with dielectric patterns to create bridge lines that both protect against electrostatic discharge and remain visually imperceptible. The transparent conductive material provides electrical conductivity while the dielectric pattern provides insulation, creating a multi-functional composite structure
2Device complexity
If metal bridge lines are placed close together to save space, then the device complexity is reduced, but the visual effect is seriously affected
Solution Approach 1:
By changing the material properties to transparent conductive materials, the bridge lines become visually imperceptible regardless of their spacing. This allows the lines to be placed closer together for better space utilization without negatively impacting the visual effect, as users cannot see the transparent bridge lines
3Ease of manufacture
If the touch-sensing circuit is manufactured on the substrate before the color filter thin film is formed, then the manufacturing process is simplified, but the yield decreases due to electrostatic discharge damage
Solution Approach 1:
The patent implements electrostatic protection measures beforehand by designing the touch-sensing circuit with integrated electrostatic discharge protection paths. The transparent conductive material bridge lines are designed to safely conduct and dissipate electrostatic charges before they can damage sensitive circuit components, providing preemptive protection during the manufacturing process
Data Source
AI summary
A touch-sensing display panel including a display panel and a touch-sensing unit is provided. The touch-sensing unit includes a plurality of first sensing series and a plurality of second sensing series. The first sensing series are electrically insulated from one another. Each first sensing series includes first touch pads and first bridge lines. Two neighboring first touch pads disposed on a same first sensing series are electrically connected with each other through one of the first bridge lines. The second sensing series are electrically insulated from one another. Each second sensing series includes second touch pads and second bridge lines. Two neighboring second touch pads disposed on a same second sensing series are electrically connected with each other through two second bridge lines which are at least 140 micrometers apart. A touch-sensing substrate is also provided.