Display Device Optical Pattern Biometric Sensing Precision
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Solution Overview
Problem
Current display devices face challenges in precise biometric information recognition, particularly in distinguishing biometric data from ambient light and color mixing, which affects the accuracy of sensing biometric information such as fingerprints.
Innovation Solution
The display device incorporates a light blocking pattern and an optical pattern on a color filter layer, with the optical pattern overlapping the photoelectric conversion layer to reduce the sensing region and enhance precision, allowing for precise biometric information recognition by minimizing color mixing and improving light sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensing region is reduced to improve biometric recognition precision, then measurement precision improves, but the area available for light sensing decreases
Solution Approach 1:
The patent applies local quality by implementing different patterns (light blocking pattern and optical pattern) at specific locations within the sensor region. The light blocking pattern is positioned at certain areas to prevent color mixing, while the optical pattern is positioned at other areas to guide light effectively. This localized differentiation allows the sensor to maintain high precision in biometric recognition while utilizing the full sensor area for light collection.
2Measurement precision
If patterns are added to reduce color mixing and improve precision, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the patterns formed on the sensor. The light blocking pattern and optical pattern are integrated into the same sensor structure, serving both to block unwanted light (reducing color mixing) and to guide desired light (improving light sensitivity). This consolidation achieves precision improvement without proportionally increasing device complexity, as the patterns are formed as part of the sensor fabrication process rather than as separate components.
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
This configuration enables more accurate sensing of biometric information by reducing the sensing region and preventing color mixing, thereby improving the precision of biometric data acquisition.
Implementation Method 1
a light sensing element having a photoelectric conversion layer disposed in the sensor region
Implementation Method 2
a light blocking pattern disposed on the element layer and overlapping a portion of the peripheral region
Data Source
AI summary
Provided is a display device including a base layer on which a pixel region, a sensor region, and a peripheral region adjacent to the pixel region and the sensor region are defined, an element layer including a light emitting element having a light emitting layer disposed in the pixel region, and including a light sensing element having a photoelectric conversion layer disposed in the sensor region, a light blocking pattern disposed on the element layer and overlapping a portion of the peripheral region, and an optical pattern disposed on the light blocking pattern, wherein at least a portion of the optical pattern overlaps the photoelectric conversion layer on a plane. Accordingly, the display device of an embodiment may sense the biometric information of a user more precisely.