Curved OLED Display Integrating Touch and Fingerprint Detection
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Solution Overview
Problem
Integrating 3D touch sense and fingerprint identification into OLED displays with a small form factor is a challenge, particularly in wearable devices, where existing technologies struggle to efficiently combine these features with the benefits of OLED technology such as thinness, light weight, and self-illumination.
Innovation Solution
A curved-surface OLED display device is designed with a thin film transistor layer, pixel electrode layer, organic display material layer, common electrode layer, encapsulation layer, curved touch detection and fingerprint detection layer, and protective layer, where thin film transistors and sense electrodes are integrated to embed touch and fingerprint detection elements, reducing device size and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 3D touch sense and fingerprint identification are integrated into OLED display with small form factor, then device functionality is enhanced, but device complexity increases
Solution Approach 1:
The patent merges the touch detection layer and fingerprint detection layer into a single integrated structure. The touch sensing electrodes and fingerprint sensing electrodes are formed in the same layer, allowing both touch sense and fingerprint identification functions to be achieved through one integrated component rather than separate layers, thus enhancing functionality while controlling complexity.
Solution Approach 2:
The detection layer is designed to perform multiple functions: it serves as both the touch detection element and the fingerprint detection element. The same layer structure and electrode configuration enable both 3D touch sensing and fingerprint recognition, making the component universal and multi-functional.
2Adaptability or versatility
If multiple detection elements are integrated into OLED display, then device capabilities are improved, but manufacturing process complexity increases
Solution Approach 1:
The detection layer is segmented into different functional regions within the same layer structure. Touch sensing electrodes are arranged in specific patterns for touch detection, while fingerprint sensing electrodes are positioned to capture fingerprint patterns. This segmentation allows multiple detection functions to be achieved through a unified manufacturing process rather than requiring separate fabrication steps for different layers.
Solution Approach 2:
The manufacturing process merges the formation of touch detection electrodes and fingerprint detection electrodes into a single deposition and patterning sequence. Both sets of electrodes are formed simultaneously in the detection layer using the same material deposition and photolithography processes, significantly simplifying the manufacturing complexity compared to producing separate touch and fingerprint layers.
3Object-affected harmful factors
If curved surface design is implemented, then device flexibility is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements a curved surface design where the detection layer and protective layer are formed with a predetermined curvature radius. This curved configuration provides flexibility and ergonomic design while the curvature parameters are carefully controlled to maintain manufacturing feasibility. The curved structure allows the device to adapt to different form factors including wearable applications.
4Length of moving object
If thin film transistor layer is used, then device thinness is improved, but device complexity increases
Solution Approach 1:
The patent employs thin film transistor (TFT) technology to create a thin-film-based display structure. The TFT layer, along with the detection layer and protective layer, forms a flexible thin-film stack that achieves device thinness and flexibility. This thin-film approach replaces bulkier rigid structures while maintaining functional performance.
Data Source
AI summary
A curved-surface OLED display device with fingerprint identification includes a substrate, a thin film transistor layer, a pixel electrode layer, an OLED display material layer, a common electrode layer, an encapsulation layer, a curved touch detection and fingerprint detection layer and a curved protective layer. The thin film transistor layer includes plural thin film transistors, plural scan lines, and plural data lines. The pixel electrode layer includes plural pixel electrodes. The curved touch detection and fingerprint detection layer includes plural sense electrodes and plural traces for performing the touch detection operation and fingerprint identification operation. A partial area of the curved touch detection and fingerprint detection layer and the curved protective layer exhibits a curved-surface shape.