Display Panel Binding Layer for Stray Light Reduction
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Solution Overview
Problem
Existing fingerprint recognition technologies face a large signal-to-noise ratio issue due to stray light from the ambient environment, which affects the accuracy of fingerprint identification.
Innovation Solution
A display panel configuration that includes a binding layer between a light-emitting panel and a photoelectric sensing panel, with light-transmitting holes and a pixel definition layer designed to minimize the incident angle of reflected light, thereby reducing stray light and improving the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photoelectric sensors are used to acquire fingerprint images, then fingerprint identification function is achieved, but signal-to-noise ratio deteriorates due to stray light from ambient environment
Solution Approach 1:
A binding layer is introduced as an intermediary component between the display panel and the photoelectric sensing panel. This binding layer serves as a mediator that blocks stray light from the ambient environment while allowing the necessary optical signals to pass through, thereby improving the signal-to-noise ratio without compromising fingerprint identification accuracy
Solution Approach 2:
The patent extracts and removes the harmful stray light component from the optical path by using the binding layer to block ambient light. This separates the useful reflected light from the harmful stray light, allowing only the necessary light to reach the photoelectric sensors for accurate fingerprint recognition
2Adaptability or versatility
If light-transmitting regions are designed for photoelectric sensing, then fingerprint recognition function is enabled, but stray light from ambient environment increases
Solution Approach 1:
The binding layer acts as an intermediary that selectively blocks stray light while permitting the necessary light transmission for fingerprint recognition. It mediates between the need for light transmission and the need to block ambient stray light, resolving the contradiction between functionality and stray light reduction
3Quantity of substance
If reflected light incidents at larger angles, then light collection area increases, but signal-to-noise ratio deteriorates
Solution Approach 1:
The binding layer introduces local quality differentiation by allowing light transmission at specific angles while blocking stray light at other angles. The layer has different optical properties for different incident angles, permitting useful reflected light to pass through while blocking harmful ambient stray light, thereby maintaining signal-to-noise 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
The configuration effectively reduces stray light and minimizes the angle of reflected light incidence, enhancing the signal-to-noise ratio and improving fingerprint recognition accuracy.
Implementation Method 1
The binding layer is disposed between the first panel and the second panel to reduce or eliminate an incident stray light from an ambient environment
Implementation Method 2
Photoelectric sensors receive light reflected from valleys or ridges of the fingerprint and generate corresponding electrical signals
Implementation Method 3
A panel emits light. Photoelectric sensors receive light reflected from valleys or ridges of the fingerprint
Data Source
AI summary
A display panel and an electronic device are provided. The display panel includes a first panel, a second panel, and a binding layer. The first panel includes light-emitting units, and also includes light-transmitting regions. The second panel includes photoelectric sensing elements and a second driving circuit layer. The second driving circuit layer includes second driving transistors. The second driving transistors are electrically connected to the photoelectric sensing elements, and the photoelectric sensing elements are opposite to the light-transmitting regions. The binding layer is disposed between the first panel and the second panel, and configure to bind the first panel and the second panel.