Biometric Display Pixel-Sensor Layout for Lower Sensing Noise
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Solution Overview
Problem
Existing display devices face challenges in accurately sensing biometric information due to noise interference during the sensing process.
Innovation Solution
The display device incorporates a circuit layer with a light-emitting element and a light sensing element separated by an element defining layer, where the pixel and sensing hole injection layers are electrically insulated and the pixel and sensing cathode electrodes are connected, enhancing the separation and operation of these elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the light-emitting element and light sensing element are disposed close to each other to improve integration and reduce device area, then device area is reduced, but noise interference increases and sensing accuracy deteriorates
Solution Approach 1:
The patent divides the device into distinct functional regions using an element defining layer that physically separates the light-emitting element and light sensing element. This segmentation allows close proximity placement while maintaining functional independence and reducing noise interference between the two elements.
Solution Approach 2:
The element defining layer creates localized functional zones with different properties - the light-emitting element region and the light sensing element region are spatially differentiated. This local quality differentiation enables the light sensing element to operate with high accuracy while the light-emitting element functions independently, even when disposed close to each other.
2Ease of manufacture
If the pixel hole injection layer and sensing hole injection layer are electrically connected to improve manufacturing simplicity, then manufacturing process is simplified, but noise interference increases and sensing accuracy deteriorates
Solution Approach 1:
The patent extracts the electrical connection between the pixel hole injection layer and sensing hole injection layer by introducing an electrical insulation layer. This separation prevents noise from the light-emitting element's operation from interfering with the light sensing element's measurements, thereby maintaining sensing accuracy while still allowing for a relatively simple manufacturing process.
Solution Approach 2:
The electrical insulation layer acts as an intermediary between the pixel hole injection layer and sensing hole injection layer. It physically separates these layers to prevent electrical noise transmission while maintaining the structural integrity and functional operation of both elements.
3Measurement precision
If the pixel cathode electrode and sensing cathode electrode are electrically insulated to improve sensing accuracy, then sensing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the pixel cathode electrode and sensing cathode electrode into a single common cathode electrode that is electrically connected. This merging simplifies the device structure by reducing the number of separate components while the element defining layer maintains the functional separation needed for accurate sensing, thereby reducing device complexity without compromising sensing accuracy.
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 improves the accuracy of biometric information sensing by minimizing noise interference, thereby enhancing the overall quality of display and sensing capabilities.
Implementation Method 1
a photoelectric conversion layer disposed on the sensing hole injection layer
Data Source
AI summary
A display device includes a circuit layer and an element layer including a light-emitting element, a light sensing element, and an element defining layer. The light-emitting element includes a pixel anode electrode, a pixel hole injection layer disposed on the pixel anode electrode, an emissive layer disposed on the pixel hole injection layer, and a pixel cathode electrode disposed on the emissive layer. The light sensing element includes a sensing anode electrode, a sensing hole injection layer disposed on the sensing anode electrode, a photoelectric conversion layer disposed on the sensing hole injection layer, and a sensing cathode electrode disposed on the photoelectric conversion layer. The pixel hole injection layer and the sensing hole injection layer are electrically insulated from each other, and the pixel cathode electrode and the sensing cathode electrode are electrically connected with each other.