Display Device Light Blocking Layer for Biometric Sensing
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Solution Overview
Problem
Existing display devices face challenges in achieving improved sensing performance for biometric information recognition, particularly in accurately detecting and processing external inputs such as fingerprints.
Innovation Solution
The display device incorporates an enhanced input sensing layer with a specific configuration of conductive and insulation layers, along with a color filter layer and a light blocking layer, to improve the detection of biometric information by reducing unwanted light reflection and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional sensing layer configuration is used, then the device structure remains simple, but the sensing performance for biometric information recognition is insufficient
Solution Approach 1:
The sensing layer is divided into multiple distinct layers including a first sensing layer with first conductive layers and a second sensing layer with second conductive layers. Each layer performs specific sensing functions, allowing the system to achieve improved biometric recognition performance through specialized sub-components rather than a single undifferentiated structure.
Solution Approach 2:
Different regions of the sensing structure are assigned different properties and functions. The first and second conductive layers are positioned at different locations with different orientations, creating local variations in electrical properties that enhance the detection of specific biometric features while maintaining overall structural coherence.
2Measurement precision
If light blocking layers are added to reduce reflection, then sensing performance improves, but the device structure becomes more complex
Solution Approach 1:
The light blocking layers are integrated into the existing multi-layer sensing structure rather than being added as separate external components. The blocking layers are positioned between the sensing layers and the display elements, merging the light management function with the sensing function in a unified structure that reduces reflected light interference while maintaining detection accuracy.
3Measurement precision
If multiple conductive layers are used to enhance sensitivity, then biometric recognition accuracy improves, but manufacturing complexity increases
Solution Approach 1:
The first and second conductive layers are pre-positioned and configured during the manufacturing process before final assembly. The layers are arranged in specific patterns and orientations during fabrication, allowing for optimized sensing performance to be built into the structure from the outset rather than requiring complex post-manufacturing adjustments or alignments.
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 significantly enhances the display device's ability to accurately recognize biometric information, such as fingerprints, by minimizing interference from reflected light and improving the overall sensitivity of the sensing mechanism.
Implementation Method 1
a light receiving sensor FX disposed between two corresponding pixels PX that are adjacent to each other in the second direction DR2
Implementation Method 2
a color filter layer CFL and a window WM disposed on the input sensing layer ISP
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A display device includes: a display panel to display an image; and a light blocking layer over the display panel. The display panel includes: a base layer; and an element layer over the base layer, the element layer including a light emitting element, a light receiving element, and an element defining film between the light emitting element and the light receiving element. The light blocking layer includes: a light blocking portion overlapping with the element defining film in a plan view, the light blocking portion having a first light blocking opening overlapping with the light emitting element, and a second light blocking opening overlapping with the light receiving element; and a protrusion protruding from the light blocking portion toward the element defining film.