Display-Integrated Optical Compensation for Fingerprint Sensor Uniformity
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Solution Overview
Problem
Existing electronic devices face challenges in efficiently integrating fingerprint recognition and display functions, particularly in ensuring uniform sensitivity and quality across optical sensors, which affects fingerprint authentication and display performance.
Innovation Solution
An optical compensation system is implemented in electronic devices, utilizing a display panel with integrated sensors and a memory system to store and reconstruct compression compensation data, including offset and gain data, to enhance sensor data accuracy and uniformity, specifically for fingerprint authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical sensors are integrated into the display panel for fingerprint recognition, then device functionality is enhanced, but sensor sensitivity uniformity deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values for each sensor element in a lookup table (LUT) during the manufacturing process. These compensation values correct for inherent variations in sensor sensitivity before the device is used, ensuring uniform fingerprint recognition performance across all sensors without requiring real-time calibration.
Solution Approach 2:
The patent changes the sensitivity parameter of each sensor element by applying compensation values stored in the LUT. The sensor driving circuit retrieves these compensation values and uses them to adjust the output signals from sensors with varying sensitivity, thereby achieving uniform response characteristics across all sensor elements integrated in the display panel.
2Measurement precision
If full-resolution compensation data is stored in memory, then sensor data accuracy is improved, but memory storage cost increases
Solution Approach 1:
The patent extracts only the essential compensation information needed for sensor correction and stores it in a compact lookup table format. Instead of storing complete compensation datasets, only the critical parameters required for sensitivity uniformity are retained, significantly reducing memory storage requirements while maintaining adequate correction effectiveness.
Solution Approach 2:
The patent uses a cost-effective memory implementation by storing compressed compensation data in a simplified data structure. The compensation values are stored in a compact format that reduces the amount of memory hardware needed, making the overall system more cost-effective while still providing necessary correction functionality for sensor uniformity.
3Quantity of substance
If compensation data is compressed and stored, then storage cost is reduced, but data reconstruction complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-organizing compensation data into a structured lookup table with predefined indices corresponding to sensor element positions. This pre-organization eliminates the need for complex reconstruction algorithms during operation, as the data is already arranged for direct retrieval and application, simplifying the overall system while maintaining compression benefits.
4Measurement precision
If separate optical sensors are used for fingerprint recognition, then sensor quality is maintained, but device integration complexity increases
Solution Approach 1:
The patent merges the optical sensor array with the display panel structure, integrating fingerprint recognition functionality directly into the display device. The sensor elements are fabricated within the display panel layers, eliminating the need for separate sensor modules and reducing overall device complexity while maintaining sensor performance through the applied compensation methodology.
Solution Approach 2:
The patent makes the display panel multi-functional by integrating both display and fingerprint recognition capabilities into a single structure. The same physical space and manufacturing process produce both display pixels and optical sensors, allowing the device to perform multiple functions without requiring separate dedicated components, thereby reducing integration complexity.
Data Source
AI summary
An electronic device includes: a display panel comprising a plurality of pixels and a plurality of sensors; a sensor driving circuit configured to drive the plurality of sensors; a decoder configured to receive coordinate information about an arbitrary area from the sensor driving circuit; and a memory configured to receive memory coordinate information corresponding to the arbitrary area and a read command signal from the decoder, and to output corresponding compression compensation data to the decoder, wherein the decoder includes: a first memory configured to store information for reconstruction of the compression compensation data; a reconstruction circuit configured to use the compression compensation data and the necessary information for reconstruction to output reconstruction compensation data; and a second memory configured to receive the reconstruction compensation data from the reconstruction circuit, to store the reconstruction compensation data, and to output the reconstruction compensation data to the sensor driving circuit.