Touch Sensor Shield Layer for Flexible Display Noise Reduction
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Solution Overview
Problem
Existing touch sensors in flexible display devices face challenges in enhancing touch sensitivity and minimizing noise while maintaining a slim form factor, as they are embedded within the display panel without a separate substrate, leading to issues with parasitic capacitance and impact resistance.
Innovation Solution
A touch sensor design is implemented where a shield layer is placed between the sense electrodes and the display panel, overlapping conductive lines with a mesh shape, and a light blocking layer, which helps in reducing noise and improving touch sensitivity, while also enhancing impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the touch sensor is embedded in the display panel without a separate substrate to achieve a slim form factor, then the device thickness is reduced, but parasitic capacitance increases and touch sensitivity deteriorates
Solution Approach 1:
A shield layer is introduced as an intermediary component between the sense electrode and the display panel. This shield layer acts as a mediator that blocks parasitic capacitance coupling while maintaining the embedded structure's slim profile, thereby resolving the contradiction between reduced thickness and maintained touch sensitivity
2Length of moving object
If the touch sensor is embedded in the display panel to achieve a slim form factor, then the device thickness is reduced, but impact resistance decreases
Solution Approach 1:
The shield layer serves as a protective cushioning layer positioned between the sense electrode and the display panel. This layer provides mechanical protection and impact resistance while maintaining the embedded configuration, thus resolving the contradiction between slim thickness and adequate impact resistance
3Reliability
If the shield layer completely overlaps the sense electrode to maximize noise reduction, then parasitic capacitance is minimized, but the aperture ratio and light emission area are reduced
Solution Approach 1:
The shield layer is designed with non-uniform coverage, being disposed only in specific regions where parasitic capacitance and noise are most problematic, rather than completely overlapping the entire sense electrode. This localized approach selectively reduces noise while preserving aperture ratio and light emission area
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 improves touch sensitivity and minimizes noise generated during display panel operation, while reinforcing the impact resistance of the touch sensor and display device, making it suitable for flexible display applications.
Implementation Method 1
the touch sensor includes a sense electrode that senses a touch and a shield layer that is disposed between the sense electrode and the display panel while partially overlapping the sense electrode
Data Source
AI summary
A display device according to an exemplary embodiment includes: a display panel that displays an image; and a touch sensor that is provided on the display panel, wherein the touch sensor includes a sense electrode that senses a touch and a shield layer that is disposed between the sense electrode and the display panel while partially overlapping the sense electrode, the sense electrode includes a plurality of conductive lines that are connected with each other and have a mesh shape, the plurality of conductive lines includes a first conductive line and a second conductive line that are disposed on different layers, and the shield layer overlaps at least one of the first conductive line and the second conductive line.