Fingerprint Sensing Chip Decoder Reduces Panel Wiring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current full-screen fingerprint techniques require a large number of wires and leads on the panel, which increases the panel's frame size as the number of fingerprint zones increases, leading to inefficiencies in fingerprint sensing control.
Innovation Solution
A chip is designed to control a panel for fingerprint sensing, reducing the number of start pulse signals output by using a decoder on the panel to indicate selected fingerprint zones with fewer start pulse signals, allowing the panel to generate scan signals for the selected zone, thereby minimizing the number of wires and leads needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of fingerprint zones is increased to cover a larger panel area, then the fingerprint sensing coverage is improved, but the number of wires and leads required increases, resulting in a larger frame size
Solution Approach 1:
The fingerprint sensing pixels are divided into multiple fingerprint zones along the column direction, with each zone independently controllable through the decoder. This segmentation allows the panel to be divided into manageable regions that can be activated selectively, reducing the need for continuous wiring across the entire panel area.
Solution Approach 2:
A decoder is introduced as an intermediary component on the panel that receives a reduced number of start pulse signals from the control chip and generates the necessary scan signals for multiple fingerprint zones. This decoder acts as a signal multiplication device, allowing fewer external wires to control more zones than the number of wires would otherwise permit.
2Area of stationary object
If the number of fingerprint zones is increased to cover a larger panel area, then the fingerprint sensing coverage is improved, but the number of wires and leads required increases, leading to greater device complexity
Solution Approach 1:
The decoder serves as an intermediary that simplifies the external interface by accepting fewer start pulse signals from the control chip and internally generating the complex scan signals needed for multiple fingerprint zones. This reduces the complexity of external wiring while maintaining the capability to control numerous zones.
Solution Approach 2:
The panel incorporates the decoder directly on its surface, allowing it to self-generate the necessary scan signals for multiple fingerprint zones using only a reduced set of external control signals. This self-service capability eliminates the need for complex external signal distribution networks.
3Length of stationary object
If fewer start pulse signals are output by the chip, then the number of wires and leads is reduced, but the capability to select and control multiple fingerprint zones must be maintained
Solution Approach 1:
The decoder on the panel acts as a signal intermediary that receives a reduced number of start pulse signals from the control chip and expands them into the full set of scan signals needed to address and control all fingerprint zones. This allows the chip to output fewer signals while maintaining full zone selection capability through the decoder's internal signal generation logic.
Data Source
AI summary
A chip capable of controlling a panel to perform fingerprint sensing is provided. Fingerprint sensing pixels of the panel are divided into a plurality of fingerprint zones along a first direction. The chip includes a control circuit. The control circuit provides multiple control signals for controlling the panel to perform fingerprint sensing. The control signals include multiple start pulse signals. The start pulse signals are used to indicate the selected fingerprint zone. The number of the fingerprint zones is greater than the number of the start pulse signals.