Display Substrate Touch-Line Layout for Lower Parasitic Capacitance
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Solution Overview
Problem
In existing OLED display apparatus with integrated touch functionality, the proximity of touch drive and sensing lines leads to significant parasitic capacitance, causing mutual interference and affecting touch performance.
Innovation Solution
The display substrate design includes a base substrate with touch lines in the bezel region, where the distance between touch drive and sensing lines is increased, and optionally incorporates shield lines to reduce parasitic capacitance and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch drive lines and touch sensing lines are placed close together in the bezel region, then the bezel width is reduced, but parasitic capacitance increases causing mutual interference between touch signals
Solution Approach 1:
A shield line is introduced as an intermediary element positioned between the touch drive lines and touch sensing lines in the bezel region. This shield line acts as a mediator that blocks electromagnetic field coupling between the drive and sensing lines, thereby reducing parasitic capacitance and mutual interference while allowing the lines to remain closely spaced for narrow bezel design
Solution Approach 2:
The harmful electromagnetic field coupling between touch drive lines and sensing lines is extracted and redirected through the shield line. The shield line captures and grounds the interfering fields, removing the parasitic capacitance effect from the touch signal path while maintaining the compact layout
2Object-affected harmful factors
If the distance between touch drive lines and touch sensing lines is increased, then parasitic capacitance is reduced, but the bezel width increases
Solution Approach 1:
The shield line serves as a compact intermediary solution that achieves parasitic capacitance reduction without requiring increased spacing between touch drive and sensing lines. By placing the shield line adjacent to these lines in the bezel region, the interfering electromagnetic fields are blocked and grounded, maintaining narrow bezel width while effectively reducing parasitic capacitance
3Object-affected harmful factors
If shield lines are added between touch drive lines and touch sensing lines, then parasitic capacitance is reduced by up to 72%, but device complexity increases
Solution Approach 1:
The electrical parameters of the touch signal transmission are improved by introducing the shield line, which changes the electromagnetic field distribution and reduces parasitic capacitance by up to 72%. This parameter change in electrical performance is achieved with minimal structural addition, as the shield line uses the same conductive material and manufacturing process as existing touch lines
Data Source
AI summary
Provided are a display substrate and a display apparatus. The display apparatus includes a base substrate including a display region and a bezel region on at least one side of the display region; and a plurality of touch lines in the bezel region, including a plurality of touch drive lines and a plurality of touch sensing lines, where a first distance is provided between any two adjacent touch drive lines in the plurality of touch drive lines, a second distance is provided between any two adjacent touch sensing lines in the plurality of touch sensing lines, a third distance is provided between the plurality of touch drive lines and the plurality of touch sensing lines, the first distance is substantially equal to the second distance, and the third distance is greater than each of the first distance and the second distance.