Touch Display Panel Shielding Layout for Bright-Line Test Interference
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Solution Overview
Problem
Bright lines appear on touch display panels during lighting tests due to floating touch wirings interfering with data lines, causing interference and potential misjudgment of broken wires.
Innovation Solution
Incorporating shielding wiring groups between data and touch wiring groups, connected to thin film transistors that are controlled during lighting tests to reduce capacitive reactance and impedance changes, thereby minimizing interference and bright line occurrences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch wirings are left floating during lighting test, then lighting test can be performed, but bright lines appear due to capacitive coupling between touch wirings and data lines
Solution Approach 1:
The patent introduces shielding wirings as intermediary elements positioned between the touch wirings and data lines. These shielding wirings act as mediators that block the capacitive coupling path, preventing the harmful electrical field interaction between touch wirings and data lines during lighting tests, thereby eliminating bright lines while maintaining test functionality
Solution Approach 2:
The patent converts the harmful floating state of touch wirings into a beneficial condition by connecting them to a potential during lighting tests. This transformation eliminates the capacitive coupling effect that causes bright lines, while the shielding wirings simultaneously provide electromagnetic shielding. The previously harmful floating potential is converted into a controlled potential state that benefits both touch functionality and display testing
2Object-affected harmful factors
If shielding wirings are added between data lines and touch wirings, then capacitive coupling is reduced, but device structure becomes more complex
Solution Approach 1:
The patent merges multiple functions into the shielding wirings: they provide electromagnetic shielding, serve as reference potential connections, and act as structural support elements. By combining these functions into a single integrated component rather than adding separate elements for each function, the overall device complexity is minimized while achieving effective capacitive coupling reduction
Solution Approach 2:
The shielding wirings are designed to perform multiple functions simultaneously: electromagnetic shielding, potential reference, and structural positioning. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity while effectively addressing the capacitive coupling interference problem
3Reliability
If touch wirings are connected to driver chip during lighting test, then normal signal reception occurs, but lighting test cannot be performed due to driver chip requirements
Solution Approach 1:
The patent implements dynamic switching of the touch wiring connection state. During lighting tests, the touch wirings are connected to a reference potential through shielding wirings to enable testing. During normal operation, the touch wirings are connected to the driver chip for signal reception. This dynamic reconfiguration allows the system to adapt to different operational modes, resolving the contradiction between testing requirements and normal operation
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 solution effectively reduces interference between touch and data lines, preventing bright lines and ensuring accurate lighting tests by stabilizing capacitive reactance and impedance, thus improving display quality.
Implementation Method 1
the lighting test signal lines CTL cross or couple with the touch wirings TPL in the direction of the thickness of the touch display panel 1, so the touch wirings TPL have corresponding potentials due to the coupling
Implementation Method 2
Coupling is also formed between the touch wirings TPL and the data lines DL, thereby interfering with the data signals transmitted on the data lines DL
Data Source
AI summary
A touch display panel and a display device are provided. The touch display panel includes a plurality of data line groups, a plurality of touch wiring groups, a plurality of shielding wiring groups, and a plurality of thin film transistors. Through correspondingly connecting one thin film transistor to at least one shielding wiring, the thin film transistor can be turned on and a corresponding electrical signal is input during the lighting test, improving or eliminating the bright lines caused by the data lines suffering the interference during the lighting test.