Conductive Filter Film Layer for Under-Display Fingerprint Signal Detection
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Solution Overview
Problem
Display apparatuses with fingerprint recognition functions suffer from poor signal-to-noise ratios due to interference from signal lines, leading to ineffective fingerprint recognition.
Innovation Solution
A display panel design featuring a filter film layer with a conductive material, positioned away from the base substrate and signal lines, which serves as a detection plate for the fingerprint recognition circuit, allowing for improved signal detection and transmission of light from light-emitting regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fingerprint recognition circuit is placed close to signal lines for compact design, then device complexity is reduced, but signal-to-noise ratio deteriorates due to electromagnetic interference
Solution Approach 1:
The detection plate function is extracted from the traditional fingerprint recognition circuit and assigned to the filter film layer, which is positioned away from signal lines. This separates the signal detection function from the circuit components, eliminating electromagnetic interference while maintaining compact overall design.
Solution Approach 2:
The filter film layer acts as an intermediary element that performs both optical filtering and capacitive detection functions. By using this intermediate layer as the detection plate, the patent avoids direct placement of fingerprint recognition circuits near signal lines, thereby reducing interference.
2Measurement precision
If the detection plate is positioned away from signal lines to reduce interference, then signal-to-noise ratio is improved, but device area increases
Solution Approach 1:
The filter film layer is designed to serve multiple functions: optical color filtering, light transmission, and capacitive detection plate. By integrating these functions into a single layer, the patent achieves improved signal-to-noise ratio without requiring additional space for separate detection components.
Solution Approach 2:
The patent combines the detection plate with the filter film layer, merging two previously separate components (detection plate and color filter) into one integrated structure. This reduces overall device area while positioning the detection function away from interfering signal lines.
3Device complexity
If a traditional fingerprint recognition circuit is used with separate detection plate, then circuit design is simplified, but manufacturing process complexity increases
Solution Approach 1:
The detection plate and filter film layer are merged into a single integrated component, reducing the number of separate parts that need to be manufactured and assembled. This integration simplifies the overall manufacturing process while maintaining circuit design simplicity.
Solution Approach 2:
The filter film layer performs multiple functions including optical filtering and capacitive detection, eliminating the need for separate detection plate manufacturing. This multi-functionality reduces manufacturing steps and material usage while maintaining circuit design simplicity.
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
Enhances the signal-to-noise ratio of fingerprint recognition signals, ensuring better recognition accuracy and intensity while maintaining normal display functionality.
Implementation Method 1
the filter film layer is capable of transmitting light emitted from the plurality of light-emitting regions
Implementation Method 2
configured for fingerprint recognition based on light reflected by an obstacle and received by the filter film layer
Data Source
AI summary
Provided is a display panel including a base substrate, a display function film layer, a filter film layer, and a fingerprint recognition circuit. The display function film layer is disposed on the base substrate, and the display function film layer is provided with a plurality of light-emitting regions. The filter film layer is disposed on a side of the display function film layer away from the base substrate, wherein the filter film layer is capable of transmitting light emitted from the plurality of light-emitting regions, and a material of the filter film layer comprises a conductive material. The fingerprint recognition circuit is disposed on the base substrate, wherein the fingerprint recognition circuit is connected to the filter film layer, and configured for fingerprint recognition based on light reflected by an obstacle and received by the filter film layer.