Display Panel Subpixel Layout for In-Display Fingerprint Sensing
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Solution Overview
Problem
The integration of fingerprint recognition devices in display panels reduces the screen-to-body ratio and affects the accuracy of fingerprint recognition due to interference from densely packed sub-pixels and varying light emission colors, leading to reduced photosensitive layer area and signal intensity.
Innovation Solution
A display panel design with a sub-pixel array and photosensitive units under gaps, featuring alternating delta-shaped sub-groups and Y-shaped photosensitive units with equal overlapping areas to minimize light filtering differences and enhance photosensitive layer area, ensuring uniform light reception and improved recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the fingerprint recognition device is integrated in the display area, then the screen-to-body ratio is increased, but the photosensitive layer area is reduced due to interference from densely packed sub-pixels
Solution Approach 1:
The sub-pixel array is divided into multiple display groups with display sub-groups arranged in rows and columns. Photosensitive units are positioned in the gaps between sub-pixels within each display sub-group, creating segmented regions that accommodate both display elements and photosensitive elements without direct overlap.
Solution Approach 2:
The photosensitive units are arranged in a third dimension beneath the sub-pixel array, utilizing the vertical space in the gaps between sub-pixels. This allows the photosensitive layer to receive light from above without occupying the same horizontal plane as the sub-pixels, effectively resolving the area conflict.
2Area of stationary object
If the fingerprint recognition device is integrated in the display area, then the screen-to-body ratio is increased, but the recognition accuracy is reduced due to interference from varying light emission colors
Solution Approach 1:
Each photosensitive unit is positioned to receive light from specific sub-pixels (e.g., first photosensitive units receive from first sub-pixels, second photosensitive units receive from second sub-pixels). This localized light reception ensures that each photosensitive unit captures light of consistent color characteristics, eliminating the interference from varying light emission colors across different regions.
Solution Approach 2:
The arrangement ensures that all photosensitive units within a given type receive light under substantially the same conditions (same color, same intensity range). This creates equipotential conditions for light reception, where each photosensitive unit operates in a uniform optical environment, thereby improving measurement precision.
3Device complexity
If the photosensitive layer area is reduced, then the device can be integrated in the display area, but the signal intensity is reduced
Solution Approach 1:
Multiple sub-pixels are combined to illuminate a single photosensitive unit. For example, multiple sub-pixels within a display sub-group direct their light toward the same photosensitive unit positioned in the gap below them. This merging of light sources compensates for the reduced photosensitive layer area by increasing the total light flux received, thereby maintaining signal intensity while achieving device integration.
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 design maximizes the light-receiving area of photosensitive units, enhancing signal strength and accuracy of fingerprint recognition while maintaining a high display resolution and screen-to-body ratio.
Implementation Method 1
Each of the plurality of photosensitive units includes a photosensitive device, and the photosensitive device includes a photosensitive layer. An orthographic projection of the photosensitive layer in the photosensitive device on a panel surface of the display panel has overlapping regions with orthographic projections of a first sub-pixel, a second sub-pixel and a third sub-pixel
Data Source
AI summary
A display panel includes a sub-pixel array and a plurality of photosensitive units. The sub-pixel array includes a first sub-pixel, a second sub-pixel and a third sub-pixel that are capable of emitting light of different colors. The plurality of photosensitive units are disposed under gaps of the sub-pixel array. Each of the plurality of photosensitive units includes a photosensitive device, and the photosensitive device includes a photosensitive layer; and an orthographic projection of the photosensitive layer in the photosensitive device on a panel surface of the display panel has overlapping regions with orthographic projections of the first sub-pixel, the second sub-pixel and the third sub-pixel on the panel surface of the display panel.