Array Substrate Photosensitive Device Integration for Fingerprint Recognition
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Solution Overview
Problem
Display apparatuses with integrated fingerprint recognition modules suffer from low screen-to-body ratios due to the need for a large non-display region, which also results in a decreased pixel aperture ratio and poor display effects when trying to maintain high fingerprint recognition accuracy.
Innovation Solution
An array substrate with photosensitive devices integrated into the pixel regions, where the orthographic projection of the photosensitive device overlaps with the white sub-pixel region, allowing for reduced distance between pixel rows and increased pixel aperture ratio while maintaining high fingerprint recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fingerprint recognition module is disposed in the non-display region, then the fingerprint recognition function is integrated, but the screen-to-body ratio decreases
Solution Approach 1:
The patent merges the fingerprint recognition module with the display panel by integrating photosensitive devices directly into the pixel regions of the array substrate. This combination eliminates the need for a separate non-display region, thereby increasing the screen-to-body ratio while maintaining fingerprint recognition functionality.
Solution Approach 2:
The array substrate is designed to serve multiple functions: it acts as both the display structure and the fingerprint recognition module. The pixel regions are configured to perform both display functions and photosensitive detection for fingerprint recognition, reducing the need for additional dedicated regions.
2Measurement precision
If the distance between adjacent rows of pixel regions is increased to accommodate the photosensitive device, then the fingerprint recognition accuracy is maintained, but the pixel aperture ratio decreases
Solution Approach 1:
The patent applies local quality by configuring specific pixel regions (white sub-pixel regions) with photosensitive devices while maintaining other pixel regions for normal display functions. This localized integration allows the photosensitive devices to be positioned within or overlapping with specific sub-pixel regions, ensuring sufficient detection area for fingerprint recognition while minimizing the impact on overall pixel aperture ratio.
3Area of moving object
If the photosensitive device is positioned to overlap with the white sub-pixel region, then the pixel aperture ratio is increased, but the fingerprint recognition accuracy may be compromised
Solution Approach 1:
The patent utilizes the vertical dimension by configuring the photosensitive device to extend in the thickness direction of the array substrate. The photosensitive device includes a light-shielding electrode, a photoelectric conversion layer, and a light-transmitting electrode arranged in layers, allowing it to occupy vertical space without significantly increasing the lateral footprint, thereby maintaining pixel aperture ratio while ensuring sufficient photosensitive area for accurate fingerprint recognition.
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 integration of photosensitive devices within the pixel regions enhances the screen-to-body ratio and display effectiveness of the display apparatus by allowing for closer pixel row spacing without compromising fingerprint recognition accuracy.
Implementation Method 1
a plurality of photosensitive devices disposed on the first base, wherein an orthographic projection of the photosensitive device onto the first base at least partially overlaps with the white sub-pixel region
Data Source
AI summary
Provided is an array substrate including: a first base, wherein the first base is provided with a plurality of pixel regions, and the pixel region includes a white sub-pixel region and at least two color sub-pixel regions; and a plurality of photosensitive devices disposed on the first base, wherein an orthographic projection of the photosensitive device onto the first base at least partially overlaps with the white sub-pixel region. A liquid crystal display panel and a display apparatus are also provided.