Display Panel Photosensitive Device for High-Resolution Fingerprint Detection
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Solution Overview
Problem
The area of the photosensitive element in display panels is reduced due to higher pixel resolution, leading to a lower amount of photoelectric signal and affecting detection sensitivity in fingerprint recognition.
Innovation Solution
The display panel incorporates a photosensitive device with a switching element and two photosensitive elements, connected in parallel, and includes a metal oxide semiconductor layer with insulating layers to reduce barrier differences, allowing electron tunneling and increasing the photosensitive area and detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel resolution is improved, then imaging resolution is improved, but the area of the photosensitive element is reduced
Solution Approach 1:
The photosensitive device is divided into multiple photosensitive elements (first photosensitive element and second photosensitive element) that are connected in parallel. This segmentation allows the total photosensitive area to be distributed across multiple smaller elements, maintaining sufficient photoelectric signal collection capability while accommodating higher pixel resolution requirements.
Solution Approach 2:
The patent introduces a multi-layer structure with photosensitive elements arranged in different spatial dimensions and layers. By stacking photosensitive elements vertically and connecting them in parallel, the effective photosensitive area is increased without expanding the planar footprint, thus maintaining signal strength while supporting high resolution.
2Measurement precision
If the area of the photosensitive element is reduced, then pixel resolution is improved, but the amount of photoelectric signal is reduced
Solution Approach 1:
Multiple photosensitive elements are merged in parallel within a single photosensitive device. The first photosensitive element and second photosensitive element are electrically connected in parallel, combining their photoelectric signals to achieve a total signal amount that compensates for the reduced individual element area, thus maintaining detection sensitivity.
Solution Approach 2:
The patent employs a composite structure combining multiple photosensitive elements with different characteristics (such as different response wavelengths or sensitivities) within the same device. This composite approach enhances the overall photoelectric signal output and detection capability despite the reduced area of individual elements.
3Measurement precision
If the area of the photosensitive element is reduced, then pixel resolution is improved, but detection sensitivity is affected
Solution Approach 1:
The photosensitive device is segmented into multiple photosensitive elements that work in parallel. This segmentation ensures that even if individual elements have reduced area, the collective detection capability is maintained through parallel signal accumulation, preserving fingerprint recognition sensitivity.
Solution Approach 2:
The patent implements signal feedback mechanisms where the outputs of multiple photosensitive elements are combined and processed. This feedback and integration approach enhances the reliability of detection by compensating for signal losses in individual reduced-area elements, maintaining overall detection 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 parallel connection of photosensitive elements enhances the photoelectric signal and detection sensitivity, while simplifying the film layer structure and improving photosensitive performance.
Implementation Method 1
a photosensitive layer disposed on one side of the first conductive layer away from the substrate and including a first photosensitive portion corresponding to the first electrode and a second photosensitive portion corresponding to the second electrode
Implementation Method 2
the insulating layer is provided between the first electrode and the first photosensitive portion, the barrier difference between the first electrode and the first photosensitive portion can be reduced, thereby allowing electron tunneling to form a conductive path
Data Source
AI summary
The present application provides a display panel. The display panel includes: a photosensitive device, where the photosensitive device includes a switching element, a first photosensitive element, and a second photosensitive element. The first photosensitive element includes a first electrode, a first photosensitive portion, and a first protection electrode. The second photosensitive element includes a second electrode, a second photosensitive portion, and a second protective electrode. The switching element includes a source and a drain. The first electrode is connected to the second electrode, and the first photosensitive portion and the second photosensitive portion are both connected to either the source or the drain.