Display Sensor Readout Timing for Higher Biometric Sensitivity
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Solution Overview
Problem
The integration of biometric sensors into display devices leads to reduced sensing sensitivity due to increased surface area and high-frequency operation, which shortens scan times and readout times for sensing signals.
Innovation Solution
Pixels and sensors share scan lines, with a readout circuit sampling detection signals from photo sensors during specific frame periods, using integrating and sampling circuits to enhance readout time and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If scan lines for pixels and sensors are shared to reduce production cost, then manufacturing cost is reduced, but the time to scan each scan line and readout time for sensors are reduced, leading to decreased sensing sensitivity
Solution Approach 1:
The patent segments the scan line usage by dividing the frame period into multiple sub-periods, allowing different scan lines to be scanned in different time intervals. This temporal segmentation enables sufficient readout time for sensors while sharing scan lines between pixels and sensors, thus maintaining sensing sensitivity while reducing production cost.
Solution Approach 2:
The patent dynamically adjusts the scan sequence and timing based on the frame period, alternating between scanning pixel rows and sensor rows. This dynamic scanning approach allows flexible time allocation to ensure sensors receive adequate readout time while sharing scan line resources, resolving the contradiction between manufacturing cost and sensing sensitivity.
2Manufacturing precision
If display panel surface area is increased to improve resolution, then display quality is improved, but the time to scan each scan line is reduced, leading to decreased sensing sensitivity
Solution Approach 1:
The patent implements periodic scanning of scan lines within each frame period, systematically alternating between pixel scan lines and sensor scan lines. This periodic action ensures that even with increased display area requiring more scan lines, sensors still receive adequate readout time within the frame period, maintaining sensing sensitivity while supporting high resolution.
Solution Approach 2:
The patent performs preliminary configuration of scan sequences and timing schedules before actual scanning begins. By pre-planning the scan order and time allocation, the system ensures sufficient readout time for sensors is built into the scanning schedule, allowing increased display area and resolution without compromising sensing sensitivity.
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 secures sufficient readout time for biometric sensors, improving sensing sensitivity while maintaining display resolution and reducing production costs.
Implementation Method 1
an integrating circuit configured to integrate a signal flowing through the readout line
Implementation Method 2
photo sensors including a first photo sensor connected to the first scan line and a readout line
Data Source
AI summary
A display device including: scan lines including first and second scan lines; pixels connected to the scan lines; photo sensors connected to some of the scan lines, the photo sensors including a first photo sensor connected to the first scan line and a readout line, and a second photo sensor connected to the second scan line and the readout line; a scan driver to provide scan signals to the scan lines; and a readout circuit to receive, through the readout line, detection signals which are outputted from the photo sensors in response to the scan signals, wherein, while the scan signals are provided to the first and second scan lines, the readout circuit samples a detection signal of one of the first photo sensor and the second photo sensor without sampling a detection signal of the other one of the first photo sensor and the second photo sensor.