Touch Sensor Boundary Sub-Sensor Symmetry for Sensitivity Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Touch sensors in large-area display devices experience sensitivity differences due to variations in electrical characteristics between sensor patterns at boundaries and within divided regions, affecting performance.
Innovation Solution
Incorporating third sensor patterns with symmetrical sub-sensor patterns of equal size at the boundaries between adjacent sensing regions, connected by protrusion parts, to ensure uniform capacitance and improve sensing sensitivity across the entire display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the touch sensor is divided into independently driven regions, then the load of the display device is minimized, but the electrical characteristics of sensor patterns at the boundary differ from those within the divided regions, causing sensing sensitivity differences
Solution Approach 1:
The patent applies local quality by configuring third sensor patterns specifically at the boundary regions between divided sensing regions, while sensor patterns within the divided regions have different configurations. The third sensor patterns include first and second sub-sensors with substantially the same size that are electrically separated at the boundary, creating localized electrical characteristics that match the boundary region's capacitance. This local adaptation resolves the sensitivity difference between boundary and non-boundary areas while maintaining the divided region structure for load reduction.
2Area of stationary object
If sensor patterns are placed at the boundary of divided regions, then complete coverage of the sensing area is achieved, but the electrical characteristics (resistance, capacitance) differ from sensor patterns in the divided regions, leading to sensitivity inconsistency
Solution Approach 1:
The patent changes the electrical parameters (capacitance, resistance) of sensor patterns located at the boundary by configuring third sensor patterns with specific sub-sensor arrangements. The first and second sub-sensors have substantially the same size and are electrically separated at the boundary, creating controlled electrical characteristics that match the boundary region. This parameter adjustment ensures that boundary sensor patterns have consistent sensing sensitivity with sensor patterns within the divided regions, while still providing complete area coverage.
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 minimizes sensitivity differences and enhances uniformity in touch sensitivity, improving the overall performance of touch sensors in large-area display devices by maintaining consistent capacitance between sub-sensor patterns.
Implementation Method 1
Sensor patterns located at the boundary of the divided regions may have an electrical characteristic (e.g., resistance, capacitance, etc.) different from that of sensor patterns located in a corresponding divided region. A sensing sensitivity difference may occur for each region due to the difference in electrical characteristics
Data Source
AI summary
A touch sensor for a display device includes: a base layer including first and second sensing regions adjacent to each other in a first direction and a non-sensing region surrounding at least one side of each of the first and second sensing regions; first sensors disposed in each of the first and second sensing regions and arranged along a second direction intersecting the first direction; second sensors disposed in each of the first and second sensing regions and arranged along the first direction; and at least one third sensor located in the first sensing region and the second sensing region, wherein the at least one third sensor includes first and second sub-sensors electrically separated at a boundary between the first sensing region and the second sensing region, and the first and second sub-sensors have substantially the same size.