Display Device Collimating Layer for Biometric Sensor Accuracy
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Solution Overview
Problem
Display devices with built-in sensors for biometric information detection, such as fingerprint or vein sensors, face challenges in achieving accurate detection due to non-parallel light incidence, which affects the reliability of reflected light entering the sensor.
Innovation Solution
Incorporating a collimating layer made of a metal material on the first substrate of the display device, which functions as a light-shielding layer and collimates light entering the sensor, ensuring only light parallel to the normal direction is detected, thereby improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical sensor is used for biometric detection, then detection capability is provided, but detection accuracy deteriorates due to non-parallel light incidence
Solution Approach 1:
A collimating layer is introduced as an intermediary component between the light source and the optical sensor. This layer mediates the light path by collimating incident light into parallel rays before they reach the sensor, thereby improving detection accuracy without compromising the sensor's detection capability
Solution Approach 2:
The patent changes the optical parameters of the light path by introducing a collimating layer that transforms divergent light into parallel light. This parameter change (light directionality) directly addresses the accuracy issue caused by non-parallel light incidence while maintaining the sensor's operational effectiveness
2Measurement precision
If a collimating layer is added to improve light parallelism, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The collimating layer is merged with the substrate structure in which the optical sensor is formed. By integrating the collimating function into the existing substrate architecture rather than adding a separate standalone component, the patent improves detection accuracy while minimizing the increase in device complexity
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 accuracy of biometric information detection by filtering out tilted light, allowing only parallel light to enter the sensor, thus improving the reliability of fingerprint and other biometric data collection.
Implementation Method 1
an optical sensor using a photoelectric conversion element is employed
Implementation Method 2
a collimating layer made of a metal material on the first substrate of the display device, which functions as a light-shielding layer and collimates light entering the sensor
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate and a liquid crystal layer. The first substrate includes a base material, a sensor including a photoelectric conversion element outputting a detection signal based on incident light from a liquid crystal layer side, and a first line electrically connected to the sensor. The pixel includes a first subpixel, a second subpixel and a third subpixel. The photoelectric conversion element is provided in an area in which the third subpixel is located. The first line includes a first branch portion overlapping the photoelectric conversion element and including an opening, and a second branch portion overlapping a through-hole provided such that the first line is electrically connected to the sensor.