Optical Fingerprint Pixel Circuit Grouping and Switching
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Solution Overview
Problem
The increasing screen size and improved fingerprint accuracy in infinity displays require a larger number of channels or units for signal reading, leading to increased chip area and power consumption in optical fingerprint detection technologies.
Innovation Solution
A display module with a fingerprint collection mechanism using multiple pixel circuits divided into groups, where a first switching unit controls the connection to a signal reading mechanism, allowing selective reading of fingerprint signals from only the necessary pixel circuits, reducing the number of channels and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixel circuits is increased to improve fingerprint accuracy and screen size, then the fingerprint detection accuracy is improved, but the chip area and power consumption increase
Solution Approach 1:
The patent divides the pixel circuits into multiple groups (first group, second group, third group, etc.) and uses switching units to selectively connect only the necessary groups to the signal reading mechanism at any given time. This segmentation allows high-resolution fingerprint detection to be achieved without requiring all pixel circuits to be simultaneously connected, thereby reducing the required chip area and power consumption while maintaining fingerprint detection accuracy.
2Adaptability or versatility
If the number of signal reading units is increased to read signals from more pixel circuits, then the fingerprint detection coverage is improved, but the power consumption and device complexity increase
Solution Approach 1:
The patent employs dynamic switching units that can reconfigure the connection between pixel circuit groups and the signal reading mechanism based on the fingerprint detection requirements. Instead of having a fixed large number of signal reading units, the system dynamically selects and connects only the necessary pixel circuit groups to the available signal reading units, reducing device complexity while maintaining adaptive coverage.
Solution Approach 2:
The signal reading mechanism is designed to handle multiple groups of pixel circuits sequentially through the switching units. A single signal reading unit can serve multiple pixel circuit groups at different time intervals, making the signal reading mechanism universal and multi-functional, thereby reducing the total number of signal reading units needed while maintaining comprehensive fingerprint detection coverage.
3Reliability
If all pixel circuits are connected to the signal reading mechanism simultaneously, then complete fingerprint data is obtained, but the power consumption increases
Solution Approach 1:
The patent implements periodic scanning of different pixel circuit groups through the switching units. Instead of simultaneously activating all pixel circuits and signal reading units, the system periodically switches between different groups of pixel circuits, reading data from each group in sequence. This periodic action ensures complete fingerprint data is collected over time while significantly reducing instantaneous power consumption compared to simultaneous activation of all circuits.
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 approach ensures accurate fingerprint detection while minimizing the chip area and power consumption by only reading signals from the required pixel circuits, improving efficiency and reducing hardware and energy demands.
Implementation Method 1
The optical fingerprint module can collect the light reflected by fingers and perform a fingerprint recognition
Data Source
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AI summary
A display module, a touch method and a terminal are disclosed. The display module includes: a signal reading mechanism; a fingerprint collection mechanism comprising a plurality of pixel circuits, the plurality of pixel circuits being divided into a plurality of groups, each group of pixel circuits being connected to the signal reading mechanism, a first switching unit being provided on a connection line of at least one group of pixel circuits and the signal reading mechanism; and a control mechanism respectively connected to the first switching unit and the signal reading mechanism respectively, wherein the control mechanism is configured to control at least one group of pixel circuits to be connected to the signal reading mechanism through the first switching unit, and to control the signal reading mechanism to read fingerprint signals collected by the at least one group of pixel circuits connected to the signal reading mechanism.