Regulation Resistors for Display Force Sensor Calibration
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Solution Overview
Problem
Current touch display panels experience abnormal force detection due to production process issues or heat-generated changes, leading to inaccurate force sensor readings even when no force is applied.
Innovation Solution
Incorporating regulation resistors for each force sensor, which apply a voltage to the regulation bridge arm to balance the sensor arms when no force is applied, ensuring accurate force detection by maintaining a balanced state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If force sensors are used to detect force magnitude on the display panel, then the capability to detect force magnitude is improved, but abnormal force detection occurs due to production process issues or heat generation causing unbalanced sensor output
Solution Approach 1:
The patent introduces regulation resistors that allow dynamic adjustment of voltage parameters in the Wheatstone bridge circuit. By changing the voltage distribution across bridge arms through the regulation resistors, the sensor can be calibrated to compensate for unbalanced states caused by production variations or thermal effects, thereby maintaining accurate force detection without compromising reliability
Solution Approach 2:
The regulation resistors act as intermediary elements between the power source and the force sensor's bridge arms. These resistors mediate the voltage distribution to balance the bridge circuit, eliminating abnormal output signals while preserving the sensor's ability to accurately detect actual force magnitudes
2Measurement precision
If regulation resistors are added to balance the sensor arms, then force detection accuracy is improved, but device complexity increases
Solution Approach 1:
The regulation resistors are integrated into the existing sensor circuit structure, merging the calibration function with the force detection circuit. This combination approach balances the bridge arms without requiring separate complex calibration systems, thereby improving accuracy while minimizing the increase in 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 solution improves the accuracy of force detection by compensating for unbalanced sensor states, reducing false readings and enhancing the reliability of force measurement in display panels.
Implementation Method 1
The detection of the magnitude of the force on the panel can be achieved by a force sensor using the Wheatstone bridge principle
Implementation Method 2
when a force is applied on the panel, the panel deforms, and the resistance of the force sensor changes
Data Source
AI summary
A display panel and a display device, the display panel includes a thin film transistor arranged in a display area of the display panel, the thin film transistor including an active layer; a metal layer; a plurality of force sensors disposed in the same layer as the active layer or the metal layer, each force sensor including a first bridge arm, a second bridge arm, a third bridge arm, and a fourth bridge arm connected end-to-end in sequence; a plurality of regulation resistors one-to-one corresponding to each force sensor, a first end of the regulation resistor being connected with a voltage regulation end, a second end of the regulation resistor being connected with a regulation bridge arm of the force sensor corresponding to the force sensor, the regulation bridge arm being any one of the first bridge arm, second bridge arm, third bridge arm and fourth bridge arm.