Display Pixel Readout Line Layout for Biometric Sensing
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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 and efficiency.
Innovation Solution
A display device design that includes a first pixel with a pixel driving circuit and a light emitting element, a second pixel with a pixel driving circuit and a light emitting element, a sensor with a sensor driving circuit and a light detection element, and specific arrangements of data and readout lines on different layers to enhance biometric information recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If biometric sensors are integrated into the display device, then biometric information recognition capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the display device and biometric sensor into a single integrated structure. The sensor is positioned between the display panel and touch screen, sharing the same device housing and control circuitry. This combining approach enables biometric recognition functionality without requiring a completely separate device, thus improving adaptability while managing complexity through integration.
Solution Approach 2:
The display device is designed to perform multiple functions: displaying visual information, detecting touch input, and recognizing biometric information such as fingerprints or iris patterns. By making the device universal and multi-functional, it accommodates various sensing modalities within a single system, enhancing versatility without proportionally increasing complexity.
2Measurement precision
If sensor components are added to the display device, then sensing performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the display device into distinct functional layers: display panel, sensor layer, and touch screen. This segmentation allows each component to be manufactured and optimized independently using specialized processes, then assembled together. The sensor can be fabricated using thin-film deposition techniques compatible with existing display manufacturing lines, reducing overall manufacturing complexity despite enhanced sensing performance.
Solution Approach 2:
The sensor is nested within the display device structure, positioned between the display panel and touch screen layers. This nesting approach allows the sensor to be integrated into the existing device architecture without requiring complete disassembly or redesign of the manufacturing process. The sensor layer is deposited or assembled within the multi-layer structure, enabling enhanced sensing capability while maintaining compatibility with standard manufacturing workflows.
3Area of stationary object
If multiple lines are arranged on the same layer, then device area is reduced, but signal interference increases
Solution Approach 1:
The patent resolves line interference by transitioning from a two-dimensional planar arrangement to a three-dimensional multi-layer configuration. Data lines and readout lines are distributed across different vertical layers separated by insulating structures, allowing signals to pass through space without electromagnetic coupling. This dimensional separation maintains compact device area while eliminating signal interference through spatial isolation.
Solution Approach 2:
Insulating layers and structural elements are introduced as intermediaries between data lines and readout lines. These intermediary structures physically separate the conductive paths and provide electrical isolation, preventing capacitive coupling and signal interference. The intermediaries allow dense line routing while maintaining signal integrity through controlled impedance and shielding.
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 improves biometric information sensing performance by optimizing the layout of data and readout lines, allowing for efficient integration of biometric sensors within the display device without degrading display performance.
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.