Driver IC for Fingerprint and Display Integration
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Solution Overview
Problem
Existing terminal devices with fingerprint sensing, touch sensing, and display driving functions require frequent mode changes of the central processing unit, leading to inefficiencies in fingerprint identification operations, as different chips communicate with the CPU in a time-sharing manner, resulting in longer unlock times.
Innovation Solution
A driver integrated circuit with a fingerprint sensing control circuit, a display driving circuit, and a touch sensing control circuit that facilitates direct communication between the fingerprint sensing and display driving circuits, as well as between these circuits and the processing circuit, allowing for simultaneous and efficient fingerprint sensing and display operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate chips are used for fingerprint sensing, touch sensing, and display driving, then each function can be independently controlled, but the communication time with the central processing unit increases due to time-sharing manner
Solution Approach 1:
The patent combines the fingerprint sensing control circuit, display driving circuit, and touch sensing control circuit into a single driver integrated circuit. This integration allows these circuits to communicate directly with each other without requiring frequent CPU mode changes, thereby reducing communication time while maintaining independent control capabilities through internal circuit coordination.
Solution Approach 2:
The driver integrated circuit acts as an intermediary between the separate functional circuits and the central processing unit. By providing a unified communication interface and internal coordination mechanism, it reduces the need for the CPU to frequently switch between different operation modes (REE and TEE), thereby decreasing communication overhead and time loss.
2Reliability
If the central processing unit frequently changes operation modes between REE and TEE, then security requirements are met, but the fingerprint identification operation time increases
Solution Approach 1:
The driver integrated circuit performs preliminary actions by pre-establishing direct communication channels between the fingerprint sensing control circuit and other functional circuits. This allows coordination and data preparation to occur before CPU mode changes are required, reducing the overall time spent on fingerprint identification while maintaining security protocols.
Solution Approach 2:
The integration enables continuous useful action by allowing the fingerprint sensing control circuit to coordinate with display and touch sensing circuits without interruption from CPU mode switching. This continuity maintains security requirements while eliminating unnecessary waiting time during fingerprint identification operations.
3Adaptability or versatility
If multiple chips communicate with the central processing unit independently, then functional versatility is maintained, but the overall system efficiency decreases
Solution Approach 1:
The patent merges multiple independent chips into a single driver integrated circuit that maintains all necessary functional capabilities. This integration improves system efficiency by enabling direct internal communication between functional circuits, eliminating the inefficiencies of independent chip communication while preserving functional versatility through dedicated control circuits for each function.
Solution Approach 2:
The driver integrated circuit embodies multi-functionality by incorporating fingerprint sensing control, display driving, and touch sensing control within a single chip. This universal design maintains the versatility of supporting multiple functions while improving overall system efficiency through integrated communication and coordination mechanisms.
Data Source
AI summary
A driver integrated circuit for fingerprint sensing, touch sensing and display driving and a driving method thereof are provided. The driver integrated circuit is adapted for driving a touch display panel with a fingerprint sensor. The driver integrated circuit includes a fingerprint sensing control circuit, a display driving circuit, and a display driving circuit. The fingerprint sensing control circuit drives the fingerprint sensor to perform a fingerprint sensing operation. The display driving circuit drives the touch display panel to perform a display operation. The touch sensing control circuit drives the touch display panel to perform a touch operation. The fingerprint sensing control circuit and the display driving circuit have a first direct communication therebetween so as to facilitate at least one of the fingerprint sensing operation and the display operation.