Touch Device Shielding Pattern for Gate Driving Circuit ESD Protection
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Solution Overview
Problem
In touch display devices, the gate driving circuit is prone to damage from Electrostatic Discharge (ESD) due to the absence of effective shielding, especially in in-cell touch displays where a comprehensive transparent conductive layer cannot be used without affecting the touch function.
Innovation Solution
A touch device design that includes a shielding pattern disposed between the array substrate and the opposite substrate, with the shielding pattern overlapping with the gate driving circuit to protect it from ESD, while maintaining the functionality of the touch function and reducing manufacturing costs by sharing materials and layers with the common electrode or pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a comprehensive transparent conductive layer is formed on the outer surface of the color filter substrate to shield ESD, then the gate driving circuit is protected from ESD damage, but the touch function and electronic properties are affected
Solution Approach 1:
The shielding structure is segmented into multiple parts: a first shielding layer formed in the peripheral region covering the gate driving circuit, and a second shielding layer formed in the display region. This segmentation allows the peripheral region to have strong ESD protection while the display region maintains touch sensitivity.
Solution Approach 2:
Different shielding strategies are applied to different regions: the peripheral region uses a comprehensive transparent conductive layer for strong ESD protection, while the display region uses a grid-like or patterned shielding structure that provides ESD protection while maintaining touch functionality through gaps in the shielding pattern.
2Reliability
If a comprehensive transparent conductive layer is formed on the outer surface of the color filter substrate, then ESD protection is achieved, but manufacturing complexity increases
Solution Approach 1:
The shielding structure is merged with existing device components. The first shielding layer is integrated with the peripheral region structure, and the second shielding layer is formed using the same transparent conductive material as the touch electrode, reducing the need for separate manufacturing processes.
Solution Approach 2:
The transparent conductive layer serves multiple functions: it acts as the touch electrode for touch sensing, provides ESD protection for the gate driving circuit, and serves as the second shielding layer in the display region. This multi-functionality reduces the number of separate components and manufacturing steps.
3Device complexity
If the gate driving circuit is disposed in the peripheral region without shielding elements, then device complexity is reduced, but the gate driving circuit becomes vulnerable to ESD damage
Solution Approach 1:
The first shielding layer is formed in advance during the manufacturing process, covering the gate driving circuit in the peripheral region before the device is assembled and before ESD events can occur. This preliminary protective structure is built into the device architecture from the start.
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 pattern effectively protects the gate driving circuit from ESD damage while preserving the touch function and reducing manufacturing costs by using shared materials and layers, enhancing the reliability and efficiency of the touch device.
Implementation Method 1
the gate driving circuit is prone to damage caused by Electrostatic Discharge (ESD)
Data Source
AI summary
A touch device including an array substrate, at least one gate driving circuit, an opposite substrate and a shielding pattern is provided. The array substrate has a display region and a peripheral region connecting to the display region. The gate driving circuit is disposed on the array substrate and located in the peripheral region. The opposite substrate is disposed opposite to the array substrate. The shielding pattern is disposed between the array substrate and the opposite substrate. The shielding pattern projected on the array substrate is formed a first projection, the gate driving circuit projected on the array substrate is formed a second projection, the first projection at least partially overlaps with the second projection.