Semiconductor Gate Driver Circuit for Biometric and Touch Sensing
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Solution Overview
Problem
Existing semiconductor devices with integrated light-emitting and imaging capabilities face challenges in achieving high accuracy for biometric recognition and touch sensing, particularly in fingerprint recognition and detecting movement at high frame frequencies.
Innovation Solution
A semiconductor device with a gate driver circuit that operates in two modes, utilizing a series connection of first and second register circuits to selectively supply signals to pixels, allowing for high-accuracy imaging and high-frame-frequency operation, enabling precise biometric recognition and touch sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If imaging is performed at high frame frequency for touch sensor function, then movement detection accuracy is improved, but biometric recognition accuracy deteriorates
Solution Approach 1:
The gate driver circuit dynamically switches between two operational modes: a first mode with a first number of register circuits for high-precision biometric recognition imaging, and a second mode with a second number of register circuits for high-frame-frequency touch sensor imaging. This dynamic reconfiguration allows the system to adapt its performance characteristics based on the current functional requirement.
Solution Approach 2:
The gate driver circuit is segmented into multiple register circuits that can be selectively activated. By dividing the register circuits into different groups (first register circuits and second register circuits), the system can independently control the number of active register circuits based on the operating mode, thereby resolving the contradiction between frame frequency and imaging accuracy.
2Measurement precision
If the gate driver circuit uses more register circuits for high-accuracy imaging, then biometric recognition accuracy is improved, but device complexity increases
Solution Approach 1:
The gate driver circuit is designed with multi-functionality to perform both high-precision biometric recognition imaging and high-frame-frequency touch sensor imaging. By incorporating a plurality of register circuits that can be selectively activated based on the operating mode, the circuit achieves universal functionality without requiring separate dedicated circuits for each function, thereby managing complexity efficiently.
3Measurement precision
If the gate driver circuit operates in high-frame-frequency mode for touch sensing, then touch detection accuracy is improved, but imaging quality deteriorates
Solution Approach 1:
The gate driver circuit dynamically reconfigures its operational parameters by switching between different numbers of active register circuits. In touch sensor mode, the circuit activates a configuration optimized for high frame frequency to accurately detect finger movement, while in biometric recognition mode, it switches to a configuration optimized for high imaging quality.
Data Source
AI summary
A semiconductor device including a biometric recognition function and a touch sensor or near touch sensor function is provided. The semiconductor device includes a light-emitting device and an imaging device. The imaging device includes a gate driver circuit and m rows of pixels (m is an integer more than or equal to 2). The gate driver circuit includes a plurality of first register circuits and second register circuits whose number is less than that of the first register circuits. The first register circuits are connected with each other in series and the second register circuits are connected with each other in series. The gate driver circuit has a function of operating in the first mode and the second mode. In the first mode, the first register circuits are in the on state and the second register circuits are in the off state, and in the second mode, the second register circuits are in the on state and the first register circuits are in the off state.