Touch Sensor Insulating Pattern for Uniform Capacitance
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Solution Overview
Problem
Current display devices with touch sensors face challenges in achieving a uniform touch recognition rate due to variations in capacitance between touch electrodes and the second electrode, leading to inconsistent touch sensing performance across different regions.
Innovation Solution
The implementation of an insulating pattern with the same thickness as the spacer, integrated with the insulating layer, ensures equal distances between the second electrode and touch electrodes in both sensing and non-sensing regions, thereby maintaining consistent capacitance and enabling uniform touch recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch electrodes are disposed directly on the substrate without insulating pattern compensation, then the device structure is simpler, but the touch recognition rate becomes non-uniform due to capacitance variations
Solution Approach 1:
The insulating pattern is selectively formed only in the non-emission region where the spacer is located, rather than uniformly across the entire device. This local modification compensates for the capacitance difference caused by the spacer's presence, ensuring uniform touch recognition rate without unnecessarily increasing overall device complexity
Solution Approach 2:
The insulating pattern acts as an intermediary element between the touch electrode and the substrate in the non-emission region. It introduces additional capacitance to balance the capacitance difference created by the spacer, thereby mediating the capacitance variation and achieving uniform touch sensing performance
2Ease of manufacture
If the insulating pattern thickness differs from the spacer thickness, then the manufacturing process is simpler, but the distances between second electrode and touch electrodes become non-uniform, affecting capacitance consistency
Solution Approach 1:
The insulating pattern is designed with the same thickness as the spacer to create equipotential surfaces. This ensures that the distances from the second electrode to the touch electrodes are uniform across both emission and non-emission regions, maintaining consistent capacitance values and enabling reliable touch recognition
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
This configuration ensures a uniform touch recognition rate across the entire display device, enhancing user input accuracy and reliability by minimizing parasitic capacitance differences.
Implementation Method 1
variations in capacitance between touch electrodes and the second electrode, leading to inconsistent touch sensing performance
Data Source
AI summary
A display device may include: a substrate including an emission region and a non-emission region; at least one transistor disposed on the substrate; a display element layer including a light emitting element disposed to correspond to the emission region and a spacer disposed to correspond to the non-emission region; and a touch sensor disposed on the display element layer. The touch sensor may include a base layer including a sensing region and a non-sensing region, a plurality of touch electrodes provided in the sensing region, and an insulating pattern disposed to correspond to the spacer. The insulating pattern and the spacer may have the same thickness. Some of the touch electrodes may be disposed on the insulating pattern.