Fingerprint-Sensing Display Optical Layout for Higher SNR
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Solution Overview
Problem
Display devices face challenges in maintaining display quality and signal-to-noise ratio (SNR) when integrated with biometric recognition capabilities, particularly in organic light emitting display devices, due to the degradation of components and noise interference during fingerprint recognition.
Innovation Solution
The display device incorporates a first and second optical system with through holes and filling layers, including metallic and organic materials, to selectively transmit light and reduce noise, while overlapping the photosensitive layer, thereby enhancing the signal-to-noise ratio and preventing degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a detection element is embedded in the display panel for biometric recognition, then fingerprint recognition capability is achieved, but display quality degradation occurs due to component degradation and noise interference
Solution Approach 1:
The display device is segmented into distinct functional regions: a first region containing the detection element for biometric recognition and a second region for normal display operations. This spatial segmentation allows the detection element to be integrated without compromising the overall display quality, as each region operates independently with optimized characteristics for its specific function.
2Measurement precision
If additional optical components are added to improve signal-to-noise ratio, then detection accuracy is enhanced, but device complexity increases
Solution Approach 1:
The optical system is designed with multi-functionality where the same optical components serve dual purposes: they enhance the signal-to-noise ratio for fingerprint detection while simultaneously maintaining compatibility with normal display functions. The first and second optical systems are configured to work with both the detection element and the display panel, eliminating the need for separate dedicated components and thus reducing overall device complexity.
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
This configuration effectively improves the signal-to-noise ratio of the fingerprint recognition signal and reduces component degradation, maintaining display quality and enabling reliable biometric recognition without the need for additional light sources.
Implementation Method 1
a photosensitive layer on the first detection electrode
Implementation Method 2
a first optical system between the second detection electrode and the first electrode, and a second optical system on the second electrode, wherein the first optical system and the second optical system overlap the photosensitive layer in a thickness direction of the display device
Data Source
AI summary
A display device is provided. The display device includes a first substrate, a first detection electrode on the first substrate, a first bank including an opening that exposes the first detection electrode, a photosensitive layer on the first detection electrode, a second detection electrode on the photosensitive layer, a first electrode on the second detection electrode, a second bank including an opening that exposes the first electrode, a light emitting layer on the first electrode, a second electrode on the light emitting layer, a first optical system between the second detection electrode and the first electrode, and a second optical system on the second electrode, wherein the first optical system and the second optical system overlap the photosensitive layer in a thickness direction of the display device.