Segmented Touch Electrode Layout for In-Display Fingerprint Sensing
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Solution Overview
Problem
Existing display devices face challenges in improving light-sensing performance, viewing angle characteristics, and touch sensitivity, particularly in integrating sensors for recognizing input information such as fingerprints across a large display area.
Innovation Solution
A display device design incorporating light-sensing pixels with improved light-sensing performance, enhanced viewing angle characteristics, and touch sensitivity, featuring a sub-pixel structure with a light-emitting element, light-sensing pixel, and touch sensor layer, including conductive pattern layers that form sensing electrodes with specific configurations to enhance light and touch input detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light-sensing pixels are integrated into the display panel to recognize fingerprint inputs, then the display device can detect external inputs, but the light-sensing performance is insufficient leading to unclear detection
Solution Approach 1:
The conductive pattern layer is divided into multiple segments arranged in different layers, creating a segmented electrode structure that improves light-sensing performance while maintaining detection reliability
Solution Approach 2:
The patent introduces a multi-layer vertical structure with conductive patterns in different layers, transforming a two-dimensional planar electrode into a three-dimensional segmented structure to enhance light sensing capability
2Adaptability or versatility
If the display device integrates fingerprint sensing functionality, then it can recognize input information, but the viewing angle characteristics are not optimized
Solution Approach 1:
The conductive pattern is segmented into multiple parts across different layers, allowing optimized light extraction and emission angles that improve viewing angle characteristics while maintaining fingerprint sensing functionality
Solution Approach 2:
The conductive pattern layer serves dual functions: as touch sensor electrodes and as light-sensing structures, enabling the display device to perform both display and fingerprint recognition functions with optimized viewing angles
3Ease of operation
If touch sensor layer is integrated with light-sensing pixels, then touch input can be detected, but the touch sensitivity is insufficient
Solution Approach 1:
The conductive pattern layer is segmented into multiple isolated portions in different layers, creating multiple sensing zones that enhance touch sensitivity while maintaining ease of operation
Solution Approach 2:
The segmented conductive pattern acts as an intermediary structure between the touch sensor layer and light-sensing pixels, mediating both touch detection and light sensing functions with enhanced sensitivity
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
The design enables clear detection of external inputs, improved touch sensitivity, and enhanced viewing angles by optimizing the conductive pattern layers and light-sensing elements, thereby enhancing the overall performance of the display device.
Implementation Method 1
a light-receiving element configured to acquire a sensing signal corresponding to light emitted from the light-emitting element
Implementation Method 2
a touch sensor layer configured to acquire information about a touch input, and including a conductive pattern layer forming sensing electrodes
Data Source
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AI summary
A display device may include a sub-pixel above a base layer, and including a light-emitting element, a light-sensing pixel above the base layer, and including a light-receiving element configured to acquire a sensing signal corresponding to light emitted from the light-emitting element, and a touch sensor layer configured to acquire information about a touch input, and including a conductive pattern layer forming sensing electrodes and including a second conductive pattern layer including a body portion enclosing the light-receiving element in plan view, and arm portions extending from the body portion in respective directions, and a first conductive pattern layer in a different layer from the second conductive pattern layer, and including segments apart from each other in respective areas between respective ones of the arm portions in plan view.