Display Panel Light-Blocking Layer Openings for Optical Fingerprint Recognition
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Solution Overview
Problem
The challenge in optical fingerprint recognition is the high optical signal-to-noise ratio, which affects the accuracy of fingerprint recognition.
Innovation Solution
A display panel design that includes a substrate with an array layer, light-blocking layers, a light-emitting device layer, and a touch control metal layer, where specific openings in these layers are strategically positioned to minimize optical noise by allowing light to pass through while reducing ambient light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light-blocking layers with openings are used to allow light passage for fingerprint recognition, then optical signal transmission is improved, but ambient light interference increases leading to higher optical signal-to-noise ratio
Solution Approach 1:
The light-blocking layer is segmented into multiple openings of different sizes and positions. The first opening (smaller area) is positioned to allow light from the light-emitting unit to reach the photosensitive unit, while the second opening (larger area) is positioned to block ambient light from reaching the photosensitive unit directly, thereby segmenting the light paths to reduce optical noise while maintaining signal transmission.
Solution Approach 2:
Different regions of the light-blocking layer are assigned different functions through local quality variation. The first opening region is optimized for signal light transmission with smaller area to minimize noise, while the second opening region is optimized for ambient light blocking with larger area. This local differentiation allows each region to perform its specific function optimally, reducing overall optical noise while maintaining fingerprint recognition accuracy.
2Measurement precision
If multiple light-blocking layers with different opening sizes are used to reduce optical noise, then fingerprint recognition accuracy is improved, but device structure complexity increases
Solution Approach 1:
The patent combines multiple functions into a single light-blocking layer structure. Instead of using separate layers for signal transmission and noise blocking, both functions are integrated into one layer with strategically positioned openings of different sizes. This merging reduces the number of discrete components while achieving the same optical control effect, thereby simplifying the overall device structure.
Solution Approach 2:
The light-blocking layer is designed with multi-functionality, serving both as a signal transmission path (through the first opening) and as a noise blocking structure (through the second opening). This universal design allows a single component to perform multiple functions that would traditionally require separate elements, reducing device complexity while maintaining fingerprint recognition accuracy.
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 design reduces the optical signal-to-noise ratio, enhancing the accuracy of fingerprint recognition by optimizing the light path and absorption, thereby improving the recognition of fingerprint patterns.
Implementation Method 1
a light-emitting device layer disposed on a side of the first light-blocking layer away from the substrate, the light-emitting device layer including a light-emitting unit provided corresponding to the first opening
Implementation Method 2
an array layer disposed on a side of the substrate, the array layer including a plurality of drive circuit units and a photosensitive unit disposed between adjacent ones of the drive circuit units
Implementation Method 3
a first light-blocking layer disposed on a side of the array layer away from the substrate, the first light-blocking layer including a first opening and a second opening disposed corresponding to the photosensitive unit
Data Source
AI summary
The present application provides a display panel including a substrate, an array layer, a first light-blocking layer including a first opening and a second opening, a light-emitting device layer, a second light-blocking layer including a third opening provided corresponding to the first opening and a fourth opening provided corresponding to the second opening, a touch control metal layer including a fifth opening disposed corresponding to the first opening and a sixth opening disposed corresponding to the second opening. An area of the fourth opening is lesser than that of the second opening. An area of the sixth opening is greater than or equal to that of the fourth opening.