Multi-Frequency Display Drivers for Biometric and Touch Recognition
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Solution Overview
Problem
Existing display devices face challenges in efficiently integrating biometric information recognition and touch recognition functionalities without compromising performance or increasing complexity.
Innovation Solution
A display device with a first driver operating at a first frequency and a second driver operating at a second or third frequency, along with a sensor driving circuit and sensing element, enables simultaneous biometric information and touch recognition by activating different drivers for different sensing modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single driver is used for both pixel driving and sensor driving, then device complexity is reduced, but performance optimization for different sensing modes (biometric vs. touch) cannot be achieved
Solution Approach 1:
The second driver is designed to operate in multiple sensing modes (first sensing mode for biometric information and second sensing mode for touch recognition) by switching between different operating frequencies. This multi-functional design allows a single driver to replace what would traditionally require separate dedicated drivers for each sensing mode, thereby reducing overall device complexity while maintaining adaptability.
Solution Approach 2:
The second driver dynamically switches between a second operating frequency and a third operating frequency depending on the active sensing mode. This dynamic frequency switching capability enables the driver to optimize performance for different sensing requirements (biometric information recognition versus touch recognition) without requiring separate static drivers for each mode.
2Reliability
If separate drivers are used for different sensing modes, then performance optimization is achieved, but device complexity increases
Solution Approach 1:
The second driver serves multiple sensing functions (both biometric information recognition and touch recognition) by implementing frequency switching between a second operating frequency and a third operating frequency. This universal design maintains sensing performance across different modes while avoiding the need for multiple separate dedicated drivers, thus preventing complexity increase.
3Adaptability or versatility
If frequency switching is implemented in the second driver, then sensing mode flexibility is improved, but driver circuit complexity increases
Solution Approach 1:
The second driver implements dynamic frequency switching between a second operating frequency and a third operating frequency based on the active sensing mode. This dynamic capability provides sensing mode flexibility while consolidating the frequency switching functionality within a single driver circuit rather than requiring multiple static drivers, thereby limiting the increase in overall circuit complexity.
Solution Approach 2:
The second driver is divided into multiple second driving stages, with switch circuits selectively connected to different stages based on the sensing mode. This segmentation allows independent optimization of different frequency ranges for different sensing modes while maintaining a unified driver structure, balancing flexibility with controlled complexity.
Data Source
AI summary
A display device includes: a pixel, a sensor, a first driver, and a second driver. The pixel includes a pixel driving circuit and a light emitting element. The sensor includes a sensor driving circuit and a sensing element. The first driver outputs a first scan signal to the pixel driving circuit, and the second driver outputs a second scan signal to the sensor driving circuit. The first driver is to operate at a first operating frequency, and the second driver is to operate at a second operating frequency or a third operating frequency.