Array Substrate Synchronizing Display and Fingerprint via Shared Gate
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Solution Overview
Problem
Current display technologies cannot simultaneously perform image display and fingerprint identification, requiring a separate scan time for fingerprint identification, which is inconvenient for applications like fingerprint unlocking and payment systems.
Innovation Solution
An array substrate with a transistor and a photosensitive element, where the light-transmissive electrode is connected to the gate, allowing sensitive light rays to impinge on the photosensitive layer for fingerprint identification while enabling simultaneous image display by integrating the photosensitive element in a way that it does not occupy pixel regions and uses a common electrode for both display and identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the control transistor and photosensitive element are controlled individually with separate scan lines, then the fingerprint identification function can be implemented, but image display and fingerprint identification cannot be carried out synchronously
Solution Approach 1:
The patent merges the control of the photosensitive element with the control transistor by connecting the light-transmissive electrode to the gate of the control transistor. This allows both image display and fingerprint identification to be controlled through the same transistor and scan line, enabling synchronous operation without requiring separate control circuits or additional scan time.
Solution Approach 2:
The control transistor is designed to serve dual functions: controlling both the display pixel and the photosensitive element for fingerprint identification. By making the control transistor universal, the system can perform both image display and fingerprint identification simultaneously using the same control infrastructure, eliminating the need for separate scan lines and enabling synchronous operation.
2Ease of operation
If separate scan lines are arranged for the control transistor, then individual control is achieved, but the device complexity increases
Solution Approach 1:
The patent combines the control functions by connecting the light-transmissive electrode to the gate of the control transistor, allowing both the display pixel and photosensitive element to be controlled through the same scan line. This merging approach maintains individual control capability while reducing the number of separate control lines required, thereby simplifying the overall device structure.
3Adaptability or versatility
If the photosensitive element is added to achieve fingerprint identification, then the identification function is implemented, but the pixel region is occupied
Solution Approach 1:
The patent implements a nested structure where the photosensitive element is positioned within or integrated with the existing transistor structure. The photosensitive element is arranged in a direction of orthogonal projection of the transistor onto the substrate, and is located at a side of the transistor away from the substrate, allowing it to utilize the same spatial footprint without occupying additional pixel region.
Solution Approach 2:
The patent resolves the area conflict by transitioning to a different spatial dimension. Instead of placing the photosensitive element in the same plane as the pixel, it is positioned at a side of the transistor away from the substrate, utilizing the vertical dimension and side regions. This dimensional change allows fingerprint identification functionality without encroaching on the active pixel display area.
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
Enables simultaneous image display and fingerprint identification without the need for a separate scan function, facilitating applications that require synchronization of both functions.
Implementation Method 1
the photosensitive element comprising a light-transmissive electrode and a photosensitive layer... outputting an electric signal based on the sensitive light rays impinging on the photosensitive layer
Data Source
AI summary
This disclosure provides an array substrate, a display panel and a display device. The array substrate comprises a substrate, a transistor and a photosensitive element above the substrate. The transistor comprises a gate and is used for controlling display of pixels. The photosensitive element comprises a light-transmissive electrode and a photosensitive layer, the light-transmissive electrode being used for allowing sensitive light rays reflected by a surface of a fingerprint pressed thereon to pass through and impinge on the photosensitive layer, and the light-transmissive electrode being connected to the gate. By connecting the light-transmissive electrode to the gate, the array substrate achieves synchronization of image display and fingerprint identification without individually providing a scan function for fingerprint identification, which greatly facilitates the actual applications requiring synchronization of image display and fingerprint identification.