Input Sensor With Variable Insulating Layer Thickness
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Solution Overview
Problem
Existing input sensors in display devices face challenges in achieving improved input sensing sensitivity due to limitations in design and manufacturing processes, particularly in the integration of sensing electrodes and insulating layers, which affect the accuracy and reliability of touch input recognition.
Innovation Solution
The input sensor design includes a base part with a sensing region and a peripheral region, featuring sensing electrodes with mesh patterns and insulating layers of varying thickness, where the peripheral region has a thicker insulating layer than the sensing region, and signal lines are strategically positioned to enhance sensitivity and prevent interference with display elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the insulating layer thickness is increased to reduce parasitic capacitance and improve sensing sensitivity, then the input sensing sensitivity is improved, but the distance between signal lines and the base part increases which may affect manufacturing precision
Solution Approach 1:
The insulating layer is designed with different thicknesses in different regions: a first thickness in the sensing region and a second (greater) thickness in the peripheral region. This local differentiation allows the peripheral signal lines to be adequately isolated from the base part (reducing parasitic capacitance) while maintaining the sensing electrodes at an optimal distance in the sensing region for high sensitivity.
2Manufacturing precision
If the signal lines are positioned closer to the base part to improve manufacturing precision, then the manufacturing precision is improved, but the parasitic capacitance increases which reduces input sensing sensitivity
Solution Approach 1:
The insulating layer thickness is locally optimized: in the peripheral region where signal lines are located, the insulating layer has a greater thickness that provides adequate electrical isolation and reduces parasitic capacitance, while still allowing precise positioning of signal lines relative to the base part.
3Ease of manufacture
If a uniform insulating layer thickness is used to simplify manufacturing, then the ease of manufacture is improved, but the input sensing sensitivity cannot be optimized across different regions
Solution Approach 1:
The insulating layer is formed with spatially varying thickness: a first thickness in the sensing region and a second (greater) thickness in the peripheral region. This allows each region to be optimized for its specific function while using a single continuous insulating layer formation process.
Solution Approach 2:
Instead of varying the insulating layer thickness in the planar dimension, the solution transitions to the vertical dimension by creating different thickness levels in different regions. This vertical differentiation allows regional optimization of electrical properties while maintaining a relatively simple manufacturing process.
Data Source
AI summary
There are provided an input sensor having improved input sensing sensitivity, a method for manufacturing the input sensor, and a display device having the input sensor.