Touch Sensing Unit Position-Based Voltage Compensation
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Solution Overview
Problem
Display devices with touch sensing units face variations in touch detection sensitivity due to different positions and environmental factors like driving time, light, and temperature, leading to inconsistent performance.
Innovation Solution
A touch sensing unit design with a base substrate and multiple sensing units connected to different transmission lines, receiving distinct transmission voltages based on their position, to compensate for variations in sensitivity and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transmission voltage is applied to all sensing units, then the device complexity is reduced, but the touch detection sensitivity varies across different positions
Solution Approach 1:
The patent applies different transmission voltages to different groups of sensing units based on their spatial positions. Specifically, sensing units in a first region receive a first transmission voltage, while sensing units in a second region receive a second transmission voltage. This local differentiation compensates for position-dependent sensitivity variations without requiring individual customization of each sensing unit.
Solution Approach 2:
The patent changes the transmission voltage parameter across different spatial regions to compensate for sensitivity variations. By adjusting the voltage level according to position, the system maintains consistent touch detection performance across the entire display surface despite environmental factors like temperature and light affecting different regions differently.
2Measurement precision
If position-based voltage compensation is implemented, then the touch detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent segments the display surface into multiple regions (first region and second region), with each region having its own transmission voltage. This segmentation allows for simplified voltage distribution within each region while achieving overall compensation across the entire surface, reducing the complexity compared to individualized voltage control for each sensing unit.
Solution Approach 2:
Multiple sensing units within the same region share a common transmission voltage, making the transmission line configuration universal for that region. This approach reduces the number of independent voltage control circuits needed while still providing position-based compensation, balancing accuracy improvement with device complexity management.
Data Source
AI summary
A touch sensing unit includes a base substrate and a plurality of sensing units disposed on the base substrate. A plurality of scan lines extend along a first direction and are arranged along a second direction that intersects the first direction. A plurality of output lines extend along the second direction and are arranged along the first direction. A first transmission line and a second transmission line are connected to the plurality of sensing units. The first transmission line receives a first transmission voltage. The second transmission line receives a second transmission voltage different from the first transmission voltage.