Display Pixel And Sensor Layering for Biometric Recognition
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Solution Overview
Problem
Existing display devices face challenges in enhancing the sensing performance of biometric information recognition, particularly in integrating biometric sensors with display functionalities without compromising display quality.
Innovation Solution
A display device design that includes a first and second pixel with separate driving circuits, a sensor with a driving circuit and light detection element, and a readout line on a different layer from data lines, allowing for improved biometric information recognition through optimized pixel and sensor layering and connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If biometric sensors are integrated with display functionalities, then biometric recognition capability is improved, but display quality may be compromised
Solution Approach 1:
The display device is segmented into distinct functional layers: display layers (including pixel circuits and light emitting elements) and sensor layers (including photodetectors and sensor circuits). This segmentation allows each layer to be optimized independently for its specific function, enabling biometric recognition capability while maintaining display quality through separate design and fabrication processes.
Solution Approach 2:
The patent implements a multi-layered structure where sensor elements are positioned in a different spatial dimension (separate layer) from the display elements. This vertical stacking approach allows both display and sensing functions to coexist without interfering with each other's performance, as each function operates in its own optimized layer while sharing the same device footprint.
2Ease of manufacture
If readout line is disposed on the same layer as data lines, then manufacturing process is simplified, but sensing performance deteriorates due to interference
Solution Approach 1:
The readout line is disposed on a different layer from the data lines, utilizing the vertical dimension to separate signal paths. This layered arrangement eliminates electromagnetic interference between readout and data signals while maintaining manufacturing feasibility through standard multi-layer thin-film fabrication processes.
3Area of stationary object
If pixel circuits and sensor circuits are integrated in the same region, then device area is reduced, but circuit interference increases
Solution Approach 1:
Pixel circuits and sensor circuits are segmented into separate functional regions and layers. Pixel circuits are positioned in display regions while sensor circuits are positioned in sensor regions, with each circuit type optimized for its specific function. This spatial and functional segmentation reduces circuit interference while maintaining compact device area through efficient layout design.
Solution Approach 2:
Insulating layers and shielding structures are introduced as intermediaries between pixel circuits and sensor circuits. These intermediary elements electrically isolate the two circuit types, preventing signal interference and noise coupling while allowing both circuits to operate in close proximity within the integrated device structure.
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 biometric information sensing performance by optimizing pixel and sensor layering, enabling efficient integration of biometric recognition capabilities within the display device.
Implementation Method 1
an optical method that detects incident light using an optical sensor
Data Source
AI summary
A display device includes a first pixel that includes a first pixel driving circuit and a first light emitting element, a second pixel that includes a second pixel driving circuit and a second light emitting element, a sensor that includes a sensor driving circuit and a light detection element, a first data line that extends in a first direction and is electrically connected to the first pixel, a second data line that extends in the first direction and is electrically connected to the second pixel, and a readout line that extends in the first direction and is electrically connected to the sensor. The readout line is disposed on a different layer from at least one of the first data line and the second data line.