In-Screen Fingerprint Reflection Layer for Signal Noise
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Solution Overview
Problem
The optical signal-to-noise ratio of photosensitive diodes in in-screen optical fingerprint recognition technology is low due to light being reflected by the finger passing through the display panel and not being received, resulting in reduced accuracy of fingerprint recognition.
Innovation Solution
A display panel design with a reflection portion between the photosensitive device and the substrate, where light passing through the photosensitive device is reflected back into the device, enhancing the light received and improving the optical signal-to-noise ratio, includes a substrate, a metal layer with a shield and reflection portion, and semiconductor layers with light-transmitting and photosensitive portions stacked in sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light is allowed to pass through the display panel for fingerprint recognition, then the photosensitive diode can receive reflected light, but part of the light passes through without being received, reducing the optical signal-to-noise ratio
Solution Approach 1:
The patent converts the harmful effect of light passing through the panel unused into a beneficial effect by adding a reflection layer that redirects this transmitted light back to the photosensitive diode, thereby improving the optical signal-to-noise ratio and converting energy loss into useful signal reinforcement
Solution Approach 2:
The reflection layer acts as an intermediary element between the transmitted light and the photosensitive diode, capturing light that would otherwise be lost and redirecting it back to the sensor, thus mediating the interaction between light and the photosensitive device to improve reception efficiency
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 improved optical signal-to-noise ratio enhances the sensitivity of in-screen fingerprint recognition by maximizing light reception, leading to increased accuracy.
Implementation Method 1
a first metal layer provided on a side of the substrate, including a shield portion provided corresponding to the pixel region and a reflection portion provided corresponding to the photosensitive region
Implementation Method 2
a second semiconductor layer disposed on a side of the first semiconductor layer away from the substrate, the second semiconductor layer including a photosensitive semiconductor portion disposed corresponding to the photosensitive region
Data Source
AI summary
The present application provides a display panel and a display device. The display panel includes pixel driving circuits provided respectively corresponding to pixel regions and a photosensitive device provided corresponding to a photosensitive region between the pixel regions, wherein the display panel further includes: a substrate; a first metal layer provided on a side of the substrate, a first semiconductor layer disposed on a side of the first metal layer away from the substrate, a second semiconductor layer disposed on a side of the first semiconductor layer away from the substrate, and a third semiconductor layer disposed on a side of the second semiconductor layer away from the substrate. The first metal layer includes a shield portion provided corresponding to the pixel region and a reflection portion provided corresponding to the photosensitive region.