Touch Display Electrostatic Discharge Layer for Dummy Electrode Charge Management
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Solution Overview
Problem
In touch display devices, dummy electrodes with floating potentials can accumulate charges, leading to residual electrostatic charges that affect touch function and display quality, as they are not properly discharged due to lack of grounding or external circuit coupling.
Innovation Solution
Incorporating an electrostatic discharge layer on the dummy electrode, connected through a dielectric layer with specific sheet resistance, to efficiently discharge accumulated charges and reduce abnormal electric fields and display errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dummy electrodes are disposed corresponding to the spaces between driving electrodes and sensing electrodes to reduce optical visibility difference, then optical visibility is improved, but charge accumulation occurs on the floating dummy electrodes causing residual electrostatic charges that affect touch function and display quality
Solution Approach 1:
The patent introduces a discharge electrode as an intermediary component between the floating dummy electrode and ground. This discharge electrode, connected through a discharge resistor, acts as a mediator to safely discharge accumulated charges from the dummy electrode, preventing residual electrostatic charges while maintaining the dummy electrode's optical compensation function.
Solution Approach 2:
The patent applies parameter changes by controlling the resistance value of the discharge resistor within a specific range (1MΩ to 100MΩ). This resistance parameter is optimized to balance charge discharge efficiency with prevention of abnormal electric fields, allowing the dummy electrode to maintain its floating potential for optical compensation while enabling safe charge dissipation.
2Illumination intensity
If the dummy electrode is left in floating state to maintain optical compensation, then optical visibility is improved, but charges accumulate and cannot be discharged affecting touch function
Solution Approach 1:
The discharge electrode serves as an intermediary that provides a controlled discharge path for charges accumulated on the floating dummy electrode. By introducing this intermediate component with specific resistance characteristics, the system maintains the dummy electrode's floating state for optical compensation while enabling harmful charge dissipation.
Solution Approach 2:
The patent converts the harmful effect of charge accumulation into a beneficial discharge mechanism. The discharge electrode and resistor combination transforms the potentially damaging residual electrostatic charges into a controlled discharge process, turning a harmful factor into a protective mechanism that maintains both optical compensation and electrical safety.
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 electrostatic discharge layer effectively reduces charge accumulation, enhancing touch sensing function and display quality by ensuring rapid discharge of charges, preventing misjudgment and electrostatic damage, while maintaining optimal conductive properties to avoid signal interference.
Implementation Method 1
an electrostatic discharge layer is disposed on the first dielectric layer and contacts with the dummy electrode through the first through hole
Data Source
AI summary
A touch display device includes a first substrate, a touch electrode, a dummy electrode, a first dielectric layer and an electrostatic discharge layer. The touch electrode is disposed on the first substrate; the touch electrode includes a driving electrode and a sensing electrode, wherein the driving electrode is disposed adjacent to the sensing electrode. The dummy electrode is disposed on the first substrate and adjacent to at least one of the driving electrode and the sensing electrode, and two of the dummy electrode, the driving electrode and the sensing electrode are separated from each other. The first dielectric layer is disposed on the touch electrode and the dummy electrode, and the first dielectric layer has at least one first through hole disposed corresponding to the dummy electrode. The electrostatic discharge layer is disposed on the first dielectric layer and contacts with the dummy electrode through the first through hole.