Display Module Layered Openings for Low-Interference Fingerprint Detection
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Solution Overview
Problem
Existing OLED display devices with under-screen fingerprint identification face issues of optical interference and reduced structural support due to large openings in protective layers, which affect fingerprint identification efficiency and accuracy.
Innovation Solution
A display module design with strategically positioned openings in protective layers and a flexible circuit board to minimize optical interference and maintain structural support, ensuring the light reflected by the fingerprint reaches the sensor efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If large openings are provided in protective layers to expose the fingerprint identification region, then fingerprint identification function is achieved, but optical interference occurs and structural support is reduced
Solution Approach 1:
The protective layers are designed with different opening configurations at different locations. The first protective layer has a first opening with a first size, while the second protective layer has a second opening with a second size that is smaller than the first size. This local variation in opening size optimizes light transmission for fingerprint identification while reducing optical interference in different regions of the display module.
Solution Approach 2:
The protective structure is divided into multiple layers (first protective layer and second protective layer) with different opening characteristics. This segmentation allows each layer to serve a specific function: the first layer provides sufficient opening for fingerprint sensor access, while the second layer reduces optical interference, thereby resolving the contradiction between functionality and optical performance.
2Adaptability or versatility
If large openings are provided in protective layers to expose the fingerprint identification region, then fingerprint identification function is achieved, but structural support is reduced
Solution Approach 1:
The protective structure is divided into multiple layers with different opening sizes. The first protective layer has larger openings for sensor access, while the second protective layer has smaller openings that maintain structural integrity. This layered segmentation distributes the structural support function across multiple elements, allowing sufficient opening area for fingerprint identification while preserving overall structural strength.
Solution Approach 2:
Different regions of the protective structure have different opening sizes tailored to local requirements. Areas requiring sensor access have larger openings, while areas requiring structural support have smaller openings. This local optimization ensures both fingerprint identification functionality and structural support are maintained throughout the display module.
3Measurement precision
If multiple protective layers with openings are used, then fingerprint identification accuracy is improved by reducing optical interference, but device complexity increases
Solution Approach 1:
The protective structure is segmented into two distinct layers with different opening sizes, where each layer addresses specific optical interference issues. This segmentation improves fingerprint identification accuracy by optimizing light transmission characteristics, while the regular, predictable pattern of openings keeps manufacturing complexity manageable through standardized production processes.
Data Source
AI summary
A display module includes: a display panel, which has a fingerprint identification region; a first protective layer disposed on a back surface of the display panel, the back surface being a surface of the display panel opposite to a display surface of the display panel, and the first protective layer being provided therein with a first opening for exposing the fingerprint identification region; and a metal protective layer disposed on a surface of the first protective layer away from the display panel, the metal protective layer being provided therein with a second opening, the second opening exposing the first opening, and an orthographic projection of an edge of the second opening on the display panel being located outside an orthographic projection of an edge of the first opening on the display panel.