Display Panel Collimated Light for Accurate Fingerprint Recognition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fingerprint recognition in display panels is susceptible to interference from stray light, leading to suboptimal accuracy.
Innovation Solution
The use of a collimated light source and a non-collimated light source, controlled independently, with the collimated light source emitting light at a specific angle to improve photoelectric conversion efficiency and reduce stray light interference, while the non-collimated light source is used for display purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional light source is used in display panels, then the device can perform basic display functions, but the sensor element is susceptible to interference from stray light, reducing fingerprint recognition accuracy
Solution Approach 1:
The light source is segmented into multiple independent light emitting elements (first light source and second light source) that can be controlled separately. The first light source emits collimated light specifically for fingerprint recognition, while the second light source provides non-collimated light for display functions, allowing independent optimization of each function without interference
Solution Approach 2:
Different regions of the light source are assigned different optical properties - the first light source emits collimated light with specific angular characteristics (half-value angle within ±15°) optimized for fingerprint recognition, while the second light source emits non-collimated light optimized for display, creating local quality differentiation to address specific functional requirements
2Reliability
If collimated light is used for fingerprint recognition, then stray light interference is reduced and photoelectric conversion efficiency is improved, but the device complexity increases due to multiple light sources
Solution Approach 1:
The display panel integrates multiple light sources that serve different functions within a single device structure. The first light source provides collimated light for fingerprint recognition, while the second light source provides non-collimated light for display, allowing one device to perform multiple functions without requiring separate standalone systems
Solution Approach 2:
The light sources are controlled dynamically through switching mechanisms that can selectively activate the first light source for fingerprint recognition mode or the second light source for display mode, or combine both sources as needed, allowing the system to adapt its optical characteristics based on operational requirements
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 fingerprint recognition accuracy by minimizing stray light interference and improving photoelectric conversion efficiency, allowing for better identity recognition.
Implementation Method 1
improve photoelectric conversion efficiency
Data Source
AI summary
An electronic device includes a panel, and a light source which provides a light passing through the panel. The light has a first relative light intensity, a second relative light intensity, and a third relative light intensity. The first relative light intensity is a strongest light intensity, the second relative light intensity is 50% of the strongest light intensity, and the third relative light intensity is lower than 20% of the strongest light intensity. In a diagram of a relationship between a relative light intensity and an angle, the first relative light intensity corresponds to an angle of 0°, the second relative light intensity corresponds to a half-value angle, the half-value angle is between −15° and 15°, and a third relative light intensity corresponds to a range between 30° and 60° and another range between −30° and −60°.