Semiconductor Touch Panel Resistor Length Adjustment for Bridge Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Semiconductor pressure-sensing touch devices face accuracy issues in touch pressure detection due to initial imbalance in resistances caused by the laser crystallization scanning direction, leading to decreased accuracy when no pressure is applied.
Innovation Solution
Adjusting the lengths of the pressure-sensitive resistors in parallel and perpendicular directions to the laser crystallization scanning direction, ensuring R1R4=R2R3 without applied pressure, thereby maintaining bridge balance and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the semiconductor pressure-sensing touch device is made using laser crystallization scanning, then the manufacturing process is simplified and productivity is improved, but the resistance values of the pressure-sensitive resistors become imbalanced due to the scanning direction, worsening the measurement precision
Solution Approach 1:
The patent applies asymmetry by intentionally designing the pressure-sensitive resistors with different resistance values based on their positions relative to the laser crystallization scanning direction. Specifically, resistors scanned in the direction of current flow have different resistance characteristics than those scanned perpendicular to the current direction. This asymmetric design compensates for the laser scanning effects and achieves bridge balance, thereby improving measurement precision while maintaining the simplified laser crystallization manufacturing process
Solution Approach 2:
The patent changes the resistance parameters of the pressure-sensitive resistors by adjusting their geometric dimensions (length and width) according to their specific positions in the Wheatstone bridge. By modifying the resistance values to satisfy the balance condition R1×R4=R2×R3, the system compensates for the laser crystallization scanning direction effects, achieving accurate touch pressure detection while maintaining high manufacturing productivity
2Measurement precision
If the lengths of pressure-sensitive resistors are adjusted to satisfy R1R4=R2R3, then the bridge balance is improved and measurement precision increases, but the device complexity increases due to additional design constraints
Solution Approach 1:
The patent applies local quality by adjusting the geometric dimensions (length and width) of specific pressure-sensitive resistors based on their individual positions in the Wheatstone bridge relative to the laser crystallization scanning direction. Each resistor is locally optimized with specific dimensional parameters to achieve the required resistance values, allowing the system to maintain overall simplicity while achieving precise local compensation for scanning direction effects
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 improves the accuracy of touch pressure detection by preventing initial imbalance and simplifying the calculation of pressure values, while also simplifying the fabrication process.
Implementation Method 1
The semiconductor pressure-sensing touch device is generally made in a laser crystallization scanning manner
Implementation Method 2
the first pressure-sensitive resistor R1, the second pressure-sensitive resistor R2, the third pressure-sensitive resistor R3 and the fourth pressure-sensitive resistor R4, which form an electric bridge structure
Data Source
AI summary
Provided are a touch display panel and a touch display device. The touch display panel includes at least one semiconductor pressure-sensing touch device, and the semiconductor pressure-sensing touch device includes a first pressure-sensitive resistor, a second pressure-sensitive resistor, a third pressure-sensitive resistor and a fourth pressure-sensitive resistor. A first end of the first pressure-sensitive resistor and a first end of the second pressure-sensitive resistor are connected to a first power inputting terminal, a second end of the first pressure-sensitive resistor and a first end of the fourth pressure-sensitive resistor are connected to a first sense signal measuring terminal, a second end of the fourth pressure-sensitive resistor and a second end of the third pressure-sensitive resistor are connected to a second power inputting terminal.