Optical Fingerprint Sensor Ambient Light Correction
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Solution Overview
Problem
Display devices with fingerprint sensors using optical sensor technology face accuracy issues due to ambient light, which affects the reliability of fingerprint recognition.
Innovation Solution
A display device equipped with a light sensor and an illumination sensor that generates correction data to improve fingerprint recognition accuracy by accounting for varying illumination environments, using equations to correct sensing data and store light and illumination information in different conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a display fingerprint sensor using optical sensor technology is used to sense fingerprint through light generated by display panel, then fingerprint recognition function is enabled, but the accuracy is affected by ambient light incident on the sensors
Solution Approach 1:
The patent implements feedback by using an illumination sensor to detect ambient light conditions and feeding this information back to a processing unit. The processing unit then calculates correction data based on the detected illumination and applies it to compensate for ambient light effects on the fingerprint sensing data, thereby maintaining accuracy across different lighting environments
Solution Approach 2:
The patent changes the parameter of light intensity by using display pixels to generate varying intensities of light. By adjusting the light emission intensity from the display panel and using an illumination sensor to detect ambient light levels, the system adapts to different illumination environments and compensates for their effect on fingerprint recognition accuracy
2Adaptability or versatility
If the light sensor generates sensing data in varying illumination environments, then the device can operate in different conditions, but the accuracy of fingerprint recognition deteriorates due to external light interference
Solution Approach 1:
The illumination sensor continuously monitors ambient light conditions and provides feedback to the processing unit. Based on this feedback, the system calculates correction data that compensates for the specific ambient light conditions, enabling accurate fingerprint recognition across diverse illumination environments from bright outdoor settings to dim indoor environments
Solution Approach 2:
The system performs preliminary action by using the illumination sensor to detect ambient light conditions before fingerprint sensing occurs. Correction data is calculated in advance based on the detected illumination environment, and this correction is applied to the subsequent fingerprint sensing data to prevent accuracy deterioration
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
Enhances the sensitivity and accuracy of fingerprint recognition by effectively mitigating the impact of ambient light, ensuring reliable operation across different illumination levels.
Implementation Method 1
a fingerprint of a user can be sensed using light generated by an organic light emitting diode included in a display panel
Implementation Method 2
a light sensor including sensing pixels and configured to generate sensing data based on incident light
Implementation Method 3
an illumination sensor configured to generate illumination data by sensing an external illumination
Data Source
AI summary
A display device includes: a display panel including display pixels; a light sensor including sensing pixels, the light sensor generating sensing data, based on incident light; an illumination sensor for generating illumination data by sensing an external illumination; and a processing unit for calculating correction data by correcting the sensing data, using the illumination data.