Optical Sensor Luminance Adjustment for Fingerprint Authentication
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Solution Overview
Problem
Display devices with deteriorated optical sensors fail to properly authenticate users due to unclear fingerprint images generated, as the sensors' ability to convert light into electrical signals decreases with deterioration.
Innovation Solution
A display device and driving method that adjust the light emitting luminance of a sensing pattern based on the deterioration degree of optical sensors, increasing luminance as deterioration increases, and apply different reset voltages to photodiodes based on their deterioration levels to enhance signal generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical sensors are used for fingerprint sensing, then user authentication function is enabled, but sensing precision deteriorates over time due to sensor deterioration
Solution Approach 1:
The patent changes the luminance parameter of the sensing pattern over time based on detected sensor deterioration. The circuit determines deterioration degrees and adjusts luminance accordingly, increasing it as sensors deteriorate to maintain fingerprint image quality and authentication reliability.
2Measurement precision
If light emitting luminance is increased to compensate for sensor deterioration, then sensing precision is maintained, but energy consumption increases
Solution Approach 1:
The patent dynamically adjusts the luminance of the sensing pattern based on the detected deterioration degree of optical sensors. Rather than using fixed high luminance, the system adapts luminance levels in real-time, increasing energy consumption only when and to the extent necessary to compensate for actual sensor deterioration.
3Measurement precision
If different reset voltages are applied to photodiodes based on deterioration levels, then sensing precision is improved, but device complexity increases
Solution Approach 1:
The patent changes the reset voltage parameter applied to photodiodes based on their individual deterioration degrees. The circuit determines deterioration levels and adjusts reset voltages accordingly, optimizing sensing signal quality while managing the added complexity through systematic voltage control.
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
Compensates for sensor deterioration by increasing light emitting luminance and adjusting reset voltages, ensuring accurate fingerprint image generation and user authentication even with deteriorated sensors.
Implementation Method 1
An optical sensor is an electronic detector that converts light into an electrical signal
Data Source
AI summary
A display device includes a plurality of pixels in which pixels located in a selected area emit light in a sensing pattern; a plurality of optical sensors generating sensing signals corresponding to the amount of light received; and a circuit determining amounts of deterioration of the plurality of optical sensors based on the sensing signals. The circuit determines a current deterioration degree based on the amounts, sets a light emitting luminance of the sensing pattern to a first value based on the current deterioration degree, and the first value is larger than a second value associated with a previous deterioration degree when the current deterioration degree is greater than the previous deterioration degree.