Touch Display Screen Shielding Layer Fan-Out Area
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Solution Overview
Problem
Conventional self-capacitance direct On-Cell touch (S-DOT) display screens face interference issues due to display signal lines affecting touch signals, leading to accuracy problems and potential failures in touch functionality.
Innovation Solution
A touch display screen design featuring a fan-out area with a shielding layer, where touch lines and data signal lines are arranged in different layers or spaced apart, with a power line or isolation lines used as shielding to prevent interference, effectively isolating touch signals from data signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch lines and data signal lines are arranged in the same layer to simplify structure, then device complexity is reduced, but display signal lines interfere with touch signals leading to poor touch control accuracy
Solution Approach 1:
The patent transitions from two-dimensional planar arrangement to three-dimensional layered arrangement by placing touch lines and data signal lines in different layers (first touch line layer and first data signal line layer), using vertical stacking to resolve spatial interference while maintaining signal integrity and touch accuracy
Solution Approach 2:
The patent introduces a second shielding layer between the touch lines and data signal lines that includes a power line extending along the touch lines. This shielding layer acts as an intermediary that blocks electromagnetic interference from data signal lines while maintaining electrical connection through power supply, thus protecting touch signals without requiring complete physical separation
2Measurement precision
If touch lines and data signal lines are separated into different layers to prevent interference, then touch signal accuracy is improved, but device structure becomes more complex
Solution Approach 1:
The patent makes the power line serve multiple functions: it provides power supply to the touch lines and simultaneously acts as a shielding layer to block electromagnetic interference from data signal lines. This multi-functionality reduces the need for additional dedicated shielding structures, thereby limiting the increase in device complexity while achieving interference protection
3Reliability
If shielding layer is added between touch lines and data signal lines to prevent interference, then touch function reliability is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent designs the power line to automatically serve as the shielding layer through its own electrical properties and spatial arrangement. The power line's electrical connection and physical positioning create the shielding effect without requiring separate shielding structures or additional manufacturing steps, thus improving touch function reliability while avoiding increased manufacturing complexity
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
The shielding layer, comprising power lines or isolation lines, effectively prevents data signal line interference with touch signals, enhancing touch performance and accuracy.
Implementation Method 1
a first shielding layer is arranged between the touch line and the data signal line
Data Source
AI summary
The present application provides a touch display screen and a touch display device. The touch display screen includes a touch panel and a display panel. The touch panel is provided with at least one touch line, and the display panel is provided with at least one data signal line. The touch line and data signal line extend from a display area of the touch display screen to a fan-out area. A shielding layer is arranged between the touch line and the data signal line in the fan-out area to solve a problem that the data signal line interferes with touch signals of the touch line.