In-Display Fingerprint Sensing Array Substrate for Narrow Bezels
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Solution Overview
Problem
Existing fingerprint recognition systems in display panels require a non-display region for recognition, enlarging the non-display area and hindering narrow-bezel designs.
Innovation Solution
Integrate fingerprint recognition elements, including light-shielding layers with through holes and photosensitive image sensors, within the display region of the array substrate, ensuring they do not overlap with pixel elements to maintain aperture ratio and enable narrow-bezel design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fingerprint recognition region is arranged in non-display region, then fingerprint recognition function is achieved, but non-display area is enlarged
Solution Approach 1:
The patent combines the fingerprint recognition function with the display region by integrating photosensitive pixels into the display array. The light-shielding layer with through holes is positioned between the pixel units and the photosensitive pixels, allowing the same region to serve both display and fingerprint recognition purposes, thereby reducing the non-display area.
Solution Approach 2:
The patent utilizes the vertical dimension by placing the light-shielding layer with through holes at different depths relative to the pixel units and photosensitive pixels. This three-dimensional arrangement allows the fingerprint recognition elements to be integrated within the display region without interfering with the display function, effectively reducing the non-display area.
2Measurement precision
If light-shielding layer with through holes is introduced for fingerprint recognition, then recognition accuracy is improved, but aperture ratio is reduced
Solution Approach 1:
The light-shielding layer is designed with through holes only in specific regions where fingerprint recognition is needed, rather than covering the entire display area. This localized approach allows the through holes to be positioned precisely where they are needed for fingerprint recognition while maintaining high aperture ratio in other areas.
Solution Approach 2:
The through holes are positioned at specific vertical levels between the pixel units and photosensitive pixels, utilizing the depth dimension to separate the light-shielding function from the aperture function. This allows the light-shielding layer to block stray light for recognition accuracy without significantly reducing the overall aperture ratio.
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
Reduces the non-display area, allowing for narrow-bezel displays while maintaining image clarity and recognition accuracy through precise through-hole placement and imaging principles.
Implementation Method 1
part of stray light adjacent to a ridge and display luminescence given out by the pixel units and entering the photosensitive devices can be filtered by the shading area
Implementation Method 2
a plurality of photosensitive devices arranged at one side of the pixel unit opposite to the light-out surface
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An array substrate and a preparation method therefor, a fingerprint recognition method, and a display device, comprising: a base substrate (11), a plurality of pixel units (01) and a plurality of fingerprint recognition units (02) located within a display region of the base substrate (11); a fingerprint recognition unit (02) comprises: a light-shielding layer (21) and a photosensitive image sensor (23) that are located on the base substrate (11); the light-shielding layer (21) is provided with a through hole (22) which is used to achieve small-aperture imaging; the orthographic projection of the through hole (22) on the base substrate (11) does not overlap with the orthographic projection of a pixel unit (01) on the base substrate (11); the photosensitive image sensor (23) is used to receive an image of a fingerprint formed by means of the through hole (22).