Array Substrate Bias Voltage Uniformity via Line Resistance Ratios
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In touch display panels, varying line resistances and self-resistances of pressure sensors lead to different bias voltages across sensors, resulting in inaccurate pressure detection and increased calibration difficulties when the same deformation is applied.
Innovation Solution
An array substrate design where each pressure sensor has a specific ratio of its resistance to the sum of its line resistances, ensuring uniform bias voltage across all sensors, thereby standardizing detection signals for consistent pressure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure sensors are provided at different positions to detect touch pressure, then pressure detection coverage is improved, but line resistances vary causing bias voltage differences and detection accuracy degradation
Solution Approach 1:
The patent applies local quality by configuring different line resistance values for different pressure sensors based on their positions. Specifically, pressure sensors in different regions (e.g., first region vs. second region) are assigned different line resistance ratios to compensate for positional variations, ensuring that each sensor receives an appropriate bias voltage regardless of its location on the touch screen.
Solution Approach 2:
The patent changes the electrical parameters (line resistance ratios) of different pressure sensors to achieve uniform detection performance. By adjusting the ratio of line resistances connected to different power input terminals for different pressure sensors, the system compensates for variations in sensor self-resistances and positional effects, maintaining consistent bias voltages across all sensors.
2Device complexity
If each pressure sensor uses the same power input terminal configuration, then device structure is simplified, but detection signals vary for the same deformation requiring complex calibration
Solution Approach 1:
The patent implements local quality by assigning different power input terminal configurations to pressure sensors based on their positions and characteristics. Instead of using a uniform configuration for all sensors, the system tailors the line resistance ratios for each sensor group, which standardizes the detection signals and eliminates the need for complex individual calibration procedures.
3Reliability
If line resistances are made equal for all pressure sensors, then bias voltage uniformity is improved, but detection accuracy deteriorates due to varying sensor self-resistances and positions
Solution Approach 1:
The patent applies parameter changes by varying the line resistance ratios for different pressure sensors rather than maintaining equal line resistances. This approach compensates for differences in sensor self-resistances and positional variations, achieving both bias voltage uniformity and high detection accuracy simultaneously through optimized electrical parameter configuration.
Data Source
AI summary
An array substrate, a touch display panel, and a touch display device are provided. The array substrate includes a plurality of pressure sensors. Each pressure sensor includes a first input terminal electrically connected to a first power input terminal, and a second input terminal electrically connected to a second power input terminal. The array substrate also includes a first connection line between the first input terminal of each pressure sensor and the first power input terminal. The first connection line has a first line resistance. In addition, the array substrate includes a second connection line between the second input terminal of each pressure sensor and the second power input terminal. The second connection line has a second line resistance. Further, the array substrate includes a ratio of a resistance of each pressure sensor to a sum of the corresponding first line resistance and second line resistance is the same.