Force-Sensing Sensor Amplification Circuit for Display Panels
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Solution Overview
Problem
The existing force-sensing sensors in display panels face a challenge where increasing the bias voltage to enhance force detection output signal results in increased heat generation, adversely affecting touch and display functions.
Innovation Solution
Incorporating an amplification circuit connected between the force-sensing sensor and the drive chip, which amplifies the output signal without increasing the bias voltage, thereby reducing heat generation and improving force detection without compromising touch or display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bias voltage of the force-sensing sensor is increased to increase the magnitude of the output signal, then the force detection capability is improved, but the heat generation of the force-sensing sensor increases, resulting in adverse effects on the force touch function or the display function
Solution Approach 1:
An amplification circuit is introduced as an intermediary component between the force-sensing sensor and the drive chip. This amplifier boosts the output signal from the sensor without requiring increased bias voltage, thereby maintaining low heat generation while improving force detection capability. The amplifier acts as a mediator that allows signal enhancement without directly increasing the power consumption of the sensor itself.
Solution Approach 2:
The system changes the parameter being adjusted for signal enhancement. Instead of changing the bias voltage parameter (which causes heat increase), the invention changes the signal amplitude parameter through external amplification. This parameter substitution allows achieving the same goal of improved detection sensitivity without the harmful side effect of increased temperature.
2Measurement precision
If the bias voltage of the force-sensing sensor is increased to increase the magnitude of the output signal, then the signal amplitude is improved, but the adverse effects on touch function and display function caused by heat increase
Solution Approach 1:
The amplification circuit serves as an intermediary that decouples the relationship between signal magnitude and heat generation. By placing the amplifier between the sensor and the processing circuitry, the system can achieve high signal amplitude for improved measurement precision while the sensor itself operates at low power, preventing harmful thermal effects on the touch and display functions.
Solution Approach 2:
The signal amplification function is extracted from the force-sensing sensor and placed in a separate amplification circuit. This extraction allows the sensor to maintain low bias voltage and minimal heat generation, while the amplification task is performed by a dedicated component that does not contribute to the thermal issues affecting touch and display functionality.
Data Source
AI summary
A display panel and a display device reduces the adverse effects on touch function and display function caused by high heat generation of a force-sensing sensor. The display panel includes, in part, a force sensing sensor, an amplification circuit and a drive chip. The force-sensing sensor includes a first input, a second input, a first output and a second output. The amplification circuit is associated with the force-sensing sensor and includes a first amplification input, a second amplification input and at least one amplification output, wherein the first amplification input of the amplification circuit is coupled to the first output of the force-sensing sensor and the second amplification input of the amplification circuit is coupled to the second output of the force-sensing sensor. The drive chip is coupled to the amplification output of the amplification circuit.