Display Input Sensing Unit Capacitance Uniformity
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Solution Overview
Problem
Existing display devices face challenges in maintaining uniform capacitance between sensors, which affects the accuracy and reliability of touch event detection, particularly when using capacitance-sensing methods for input-sensing units.
Innovation Solution
The display device incorporates a specific configuration of electrodes with normal and severed sensor portions, along with optical dummy electrodes and compensation electrodes, to ensure uniform capacitance and improved sensing sensitivity, including a unique arrangement of first and second electrodes with varying areas and distances, and the use of auxiliary electrodes to maintain capacitance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor areas are reduced to increase resolution, then measurement precision is improved, but capacitance between sensors decreases
Solution Approach 1:
The patent applies local quality by creating different sensor portion types (normal sensor portions with larger area and severed sensor portions with smaller area) at different locations. The normal sensor portions are positioned where higher capacitance is needed, while severed portions are placed where resolution is prioritized, allowing each local region to have optimized properties for its specific function.
Solution Approach 2:
The patent changes the area parameter of sensor portions to resolve the contradiction. By varying the area of different sensor portions (normal vs. severed), the patent maintains adequate capacitance values even when overall sensor density is increased, thus preserving touch detection precision while ensuring sufficient signal strength.
2Device complexity
If sensor areas are reduced, then device complexity is reduced, but touch sensitivity deteriorates
Solution Approach 1:
The patent uses local quality by implementing different sensor portion configurations in different regions. Normal sensor portions with larger areas are strategically placed to maintain touch sensitivity in critical regions, while simpler severed portions are used in other areas, achieving a balance between complexity reduction and sensitivity maintenance.
Solution Approach 2:
The patent applies asymmetry by creating sensor portions with different area sizes (normal vs. severed) rather than using uniform sensor structures throughout. This asymmetric design allows the system to reduce overall complexity while preserving touch sensitivity through strategic placement of larger-area normal sensor portions where needed.
3Measurement precision
If non-sensing regions are reduced to increase sensing area, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies merging by integrating normal sensor portions and severed sensor portions within the same first electrode structure. This unified approach allows the electrode to provide both high-sensitivity regions (normal portions) and high-resolution regions (severed portions) without requiring separate electrode systems, thus increasing sensing coverage while controlling complexity.
Solution Approach 2:
The patent implements multi-functionality by designing first electrodes that simultaneously perform multiple functions through different sensor portions. The same electrode structure provides both normal sensor portions for high sensitivity and severed sensor portions for high resolution, eliminating the need for separate specialized electrodes and reducing overall device complexity.
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 enhances the sensitivity and accuracy of touch event detection by maintaining consistent capacitance, improving the overall performance of the input-sensing unit and maintaining touch sensitivity even with reduced sensor areas.
Implementation Method 1
In the capacitance-sensing method, a change in capacitance, which is caused when the object is touching the screen of the display device, is used to determine whether a touch event occurs.
Data Source
AI summary
A display device includes a display panel and an input-sensing unit located on the display panel. The input-sensing unit includes a plurality of sensor portions. At least one of the sensor portions is different from the others in terms of area or distance.