Analog front-end circuit and operating method for touch display device
The analog front-end circuit in touch display devices addresses noise reduction by using first noise to cancel second noise, enhancing the SNR and enabling higher amplification gain.
TWI934460BActive Publication Date: 2026-08-01ILI TECHNOLOGY CORPORATION
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Patent Information
- Application Number
- TW114104843
- Authority / Receiving Office
- TW · TW
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2026-08-01
- Estimated Expiration
- 2045-02-09
AI Technical Summary
Technical Problem
The reduction of noise in output signals is crucial due to increased parasitic capacitances in thinner touch display devices, which degrade the signal-to-noise ratio (SNR) and require reduced gain to prevent saturation.
Method used
An analog front-end circuit with a receiving circuit and amplifying circuit that utilizes first noise to reduce second noise in the touch sensing signal, improving the SNR by canceling noise through a feedback mechanism.
Benefits of technology
The proposed solution effectively reduces noise in the output signal, allowing for increased amplification gain and improved SNR in the analog front-end circuit.
✦ Generated by Eureka AI based on patent content.
Abstract
This invention provides an analog front-end circuit and its operation method for a touch display device. The analog front-end circuit includes a receiving circuit and an amplifying circuit. The receiving circuit receives a first noise located in the touch display device to generate an input signal. The amplifying circuit receives a touch sensing signal from the touch display device and also receives the input signal from the receiving circuit. The amplifying circuit uses the first noise to reduce a second noise in the touch sensing signal to generate an output signal.
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