Display Sensor Electrode Layout for Fingerprint Sensing and Touch
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Solution Overview
Problem
Existing display devices face challenges in improving light-sensing performance, viewing angle characteristics, and touch sensitivity, particularly when integrating sensors for recognizing input information like fingerprints.
Innovation Solution
A display device design incorporating a sub-pixel with a light-emitting element, a light-sensing pixel, and a touch sensor layer, featuring a conductive pattern layer with specific configurations to enhance light-sensing and touch sensitivity, including a first and second conductive pattern layer with distinct orientations and overlapping areas to optimize light path and touch input detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light-sensing pixel is integrated into the display device, then fingerprint recognition capability is improved, but light-sensing performance deteriorates due to interference from the touch sensor layer and conductive patterns
Solution Approach 1:
The conductive pattern layer is divided into multiple segments (first conductive pattern layer and second conductive pattern layer) that are spatially separated and arranged at different positions. This segmentation allows light to pass through gaps between segments while still providing sufficient conductive coverage for touch sensing and fingerprint recognition functions.
Solution Approach 2:
The patent introduces a vertical dimension by arranging conductive patterns at different heights (first conductive pattern layer at a first height, second conductive pattern layer at a second height). This multi-layer vertical arrangement allows light to pass through horizontal gaps while maintaining conductive functionality through vertical stacking, thus resolving the conflict between light transmission and conductive coverage.
2Ease of operation
If the conductive pattern layer is made more extensive to improve touch sensitivity, then touch sensitivity is improved, but light-sensing performance deteriorates due to increased light blocking
Solution Approach 1:
The conductive pattern is segmented into multiple disconnected portions rather than forming a continuous layer. This segmentation reduces the total conductive material coverage area while maintaining touch sensitivity through strategic placement of segments at high-sensitivity locations, allowing more light to pass through the gaps between segments.
Solution Approach 2:
Conductive patterns are concentrated in specific local areas where they are most needed for touch sensitivity (such as near the center of the sensing area) rather than uniformly distributed. This local concentration approach maintains touch sensitivity while minimizing overall light blocking across the light-sensing pixel area.
3Ease of manufacture
If the conductive pattern layer is simplified to reduce manufacturing complexity, then ease of manufacture is improved, but light-sensing performance and viewing angle characteristics deteriorate
Solution Approach 1:
The conductive pattern layer is segmented into standardizable modular units (first and second conductive pattern layers with specific geometric shapes like rectangles or squares). These modular segments can be manufactured using conventional photolithography and patterning processes, maintaining ease of manufacture while achieving the desired light transmission and conductive properties through their arranged configuration.
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 enhances light-sensing performance, improves viewing angle characteristics, and increases touch sensitivity, enabling clear detection of external inputs and fingerprint recognition without compromising display functionality.
Implementation Method 1
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
Implementation Method 2
a first conductive pattern layer and including segments apart from each other in respective areas between respective ones of the arm portions in plan view... the emission-facing end may define a range of an external light path for external light applied from outside of the display device
Data Source
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.