OLED Display Panel Light Blocking Layer for Fingerprint Recognition
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Solution Overview
Problem
In optical fingerprint recognition panels, light diffuse reflection from fingers is mixed with stray environmental light, making it difficult to accurately identify fingerprints due to interference.
Innovation Solution
An OLED display panel design incorporating a light blocking layer with holes to allow finger-reflected light to pass through while blocking stray light, along with electrical connections to improve conductivity and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light blocking layer is added to block stray light, then fingerprint identification accuracy is improved, but device structure complexity increases
Solution Approach 1:
The light blocking layer is merged with the source drainage electrode to form a unified structure. The source drainage electrode serves dual functions: electrical conduction and light blocking. This integration eliminates the need for a separate light blocking layer, thereby improving fingerprint identification accuracy while avoiding additional structural complexity
Solution Approach 2:
The source drainage electrode is designed to perform multiple functions simultaneously: it acts as both an electrical conduction path and a light blocking layer. This multi-functionality allows the same structural element to address both electrical and optical requirements, improving measurement precision without increasing device complexity
2Reliability
If the light blocking layer is made of conductive metal and electrically connected to high-voltage source line, then conductivity uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The light blocking layer is merged with the source drainage electrode, which is already electrically connected to the high-voltage source line. This integration automatically provides electrical connection without requiring additional connection structures, improving conductivity uniformity while simplifying manufacturing
Solution Approach 2:
The source drainage electrode serves itself by performing both electrical conduction and light blocking functions. The electrical connection to the high-voltage source line is achieved through the electrode's own structure rather than requiring separate connection mechanisms, thereby improving reliability without increasing manufacturing complexity
3Reliability
If interconnect holes are added to connect light blocking layer and anode metal layer, then electrical connectivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The source drainage electrode is merged with the light blocking layer, eliminating the need for separate interconnect holes to connect these two functional elements. The electrical connectivity is achieved through the integrated electrode structure itself, thereby improving reliability without increasing manufacturing precision requirements
Solution Approach 2:
The function of creating separate interconnect holes between the light blocking layer and anode metal layer is extracted and replaced by the integrated source drainage electrode structure. The electrode directly provides both the light blocking function and the electrical connection, removing the need for additional precision-critical hole formation steps
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
Accurate fingerprint identification is achieved by blocking stray light and enhancing high-voltage source line conductivity, improving yield and reducing manufacturing complexity.
Implementation Method 1
a light blocking layer disposed on the insulating layer, wherein the light blocking layer is provided with a plurality of holes for the light reflected by the finger to pass through
Implementation Method 2
a photo sensor disposed on a side of the TFT array far from the second metal layer and configured to receive the light passing through the hole
Data Source
AI summary
An organic light emitting diode (OLED) display panel is provided, which includes a thin film transistor (TFT) array, a second metal layer, and an insulating layer disposed on the TFT array, a light blocking layer disposed on the insulating layer, a planarization layer disposed on the light blocking layer, an anode metal layer disposed on the planarization layer, and the light blocking layer provided with a plurality of holes; wherein the second metal layer includes a source-drain metal layer, and an interconnect hole is disposed in an interlayer structure between the source-drain metal layer and the anode metal layer and is electrically connected to the source-drain metal layer and the anode metal layer.