Light Emitting Device Wavelength Adjustment via Segmented Electrodes
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Solution Overview
Problem
Existing self-light-emitting-type display panels using LEDs face challenges in maintaining consistent image quality due to variations in light wavelengths emitted by different devices, leading to visual borders and decreased image quality in tiling displays.
Innovation Solution
The implementation of a light emitting device with multiple electrically-separated conductive films on its face, allowing for the selection of a conductive film to function as the first electrode based on the state of the light emitting layer, which adjusts the wavelength of light emitted, thereby reducing variations and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple electrically-separated conductive films are provided on the first face to enable wavelength adjustment, then image quality is improved, but device complexity increases
Solution Approach 1:
The first electrode is segmented into multiple electrically-separated conductive films (first conductive film and second conductive film) that can be independently controlled. This segmentation allows selective application of voltage to different regions, enabling wavelength adjustment and compensation for variations in light emission characteristics across different devices, thereby improving wavelength consistency.
Solution Approach 2:
Different conductive films are applied to different regions of the light emitting device based on local requirements. By selectively applying voltage to specific conductive films, the wavelength of light emitted from different regions can be adjusted independently, allowing for local optimization of emission characteristics and compensation for device-to-device variations.
2Manufacturing precision
If conductive films are selected based on light emitting layer state to adjust wavelength, then image quality improves, but ease of manufacture decreases
Solution Approach 1:
Multiple conductive films are pre-applied to the light emitting device during manufacturing, each capable of adjusting the wavelength of emitted light. This preliminary preparation allows for post-manufacturing selection and adjustment of the appropriate conductive film based on the actual light emitting layer characteristics, enabling wavelength control without requiring complex real-time adjustment mechanisms.
Solution Approach 2:
The wavelength of emitted light is controlled by changing the electrical parameters (voltage application) to different conductive films rather than changing the physical structure or material composition during manufacturing. This approach allows for flexible wavelength adjustment by simply selecting which conductive film to activate, simplifying the manufacturing process compared to physical modifications.
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 approach enables the suppression of wavelength variations between light emitting devices, enhancing image quality and reducing manufacturing costs by allowing more devices to meet emission wavelength criteria, while simplifying the manufacturing process.
Implementation Method 1
a light emitting layer that is provided between a first face and a second face; a first electrode that is provided on the first face and is electrically coupled to the light emitting layer
Data Source
AI summary
A light emitting device including a light emitting layer that is provided between a first face and a second face, a first electrode that is provided on the first face and is electrically coupled to the light emitting layer, a second electrode that is provided on the second face and is electrically coupled to the light emitting layer, and a non-selected electrode that is provided on the first face and is in a state not electrically coupled to a potential supply source.