Touch Display Panel Shielding Layout for Accurate Edge Sensing
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Solution Overview
Problem
Existing touch display panels suffer from inadequate touch accuracy.
Innovation Solution
A touch display panel design with a shielding layer between the touch layer and driving backplane, where peripheral touch and driving lines have overlapping areas covered by the shielding layer, receiving the same signal as the electrodes, to isolate signals and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If peripheral touch lines and peripheral driving lines are arranged in overlapping areas to save space, then device area is reduced, but signal interference occurs and touch accuracy deteriorates
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the touch layer and driving backplane. This shielding layer specifically covers the overlapping areas where peripheral touch lines and peripheral driving lines intersect, blocking electromagnetic signal interference while allowing the lines to maintain their overlapping arrangement for space efficiency.
Solution Approach 2:
The shielding layer is selectively applied only in the overlapping areas where interference occurs, rather than covering the entire device. This localized approach prevents signal interference at critical intersection points while maintaining overall device compactness and minimizing the impact on device area.
2Measurement precision
If shielding layer is added to prevent signal interference, then touch accuracy is improved, but device complexity increases
Solution Approach 1:
The shielding layer is integrated with existing device structures, specifically combining it with the driving backplane or touch layer assembly. This merging approach allows the shielding function to be added without requiring completely separate components, thereby reducing the increase in device complexity.
Solution Approach 2:
The shielding layer serves multiple functions simultaneously: it blocks signal interference between peripheral lines, maintains device compactness by allowing overlapping line arrangements, and can be integrated with existing structural layers. This multi-functionality reduces the need for additional separate components.
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
Enhances touch accuracy by preventing signal interference between peripheral touch and driving lines, ensuring normal touch function realization.
Implementation Method 1
a shielding layer provided between the touch layer and the driving backplane, and at least partially located between the boundary of the second electrode and the bending area, where the shielding layer at least partially covers the overlapping area
Data Source
AI summary
A touch display panel is provided with a display area and a peripheral area. The peripheral area includes a bending area and a bonding area away from the display area. The touch display panel includes: a driving backplane including peripheral driving lines at least partially located in the peripheral area, at least part of the peripheral driving lines passing through the bending area, and extending into the bonding area; light-emitting devices arranged at one side of the driving backplane and located in the display area, and each including a first electrode, a light-emitting layer, and a second electrode; a touch layer arranged on a side of light-emitting device layer away from the driving backplane and including peripheral touch lines; and a shielding layers arranged between the touch layer and the driving backplane, and at least partially located between the boundary of the second electrode and the bending area.