Transparent Luminescent Sheet Structure for Clear Light Emission
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Solution Overview
Problem
Existing electroluminescent devices are visually opaque and have limited luminous efficacy and design freedom due to their opaque nature.
Innovation Solution
A transparent luminescent sheet comprising a first and second transparent layer, an electrode layer with a luminescent structure, and a clear layer to enhance transparency and luminous efficacy, allowing for a lamp function with adjustable light emission and design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an EL device uses a transparent electrode layer and transparent substrate, then light transparency is improved, but visual opacity increases and design freedom decreases
Solution Approach 1:
The device is segmented into multiple functional layers including transparent electrode layers, luminescent layers, and transparent encapsulation layers. Each layer is independently optimized for its specific function while maintaining overall transparency, allowing flexible design combinations that preserve both light transmission and design freedom.
Solution Approach 2:
The patent employs composite material structures combining transparent conductive oxides (ITO, IZO), transparent encapsulation materials, and luminescent materials. These composite structures achieve simultaneous optimization of electrical conductivity, optical transparency, and mechanical stability, enabling diverse design applications without compromising transparency.
2Loss of energy
If an EL device uses a metal electrode layer with light reflectivity, then luminous efficacy is improved, but visual transparency deteriorates
Solution Approach 1:
The patent applies local quality by positioning reflective metal electrode layers only in specific regions where light extraction enhancement is needed, while other regions maintain transparent electrodes. This localized application optimizes luminous efficacy in critical areas without compromising overall device transparency and design flexibility.
3Adaptability or versatility
If an EL device is made visually opaque, then design freedom is reduced, but manufacturing simplicity increases
Solution Approach 1:
The device structure is segmented into standardized transparent layers that can be manufactured using conventional thin-film deposition and lamination techniques. Each layer maintains transparency while providing specific functions, allowing complex transparent designs to be assembled from simpler manufactured components.
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
The transparent luminescent sheet achieves enhanced luminous efficacy and design freedom while maintaining transparency, enabling 3D lit images and preventing indoor dazzling.
Implementation Method 1
an EL element is formed through sequential stacking of a transparent electrode layer... a thin-film layer having a luminescent layer... Light emitted from the luminescent layer
Implementation Method 2
The sequential stacking of the transparent electrode layer includes indium tin oxide (ITO) or the like having light transparency... Light emitted from the luminescent layer directly passes through the transparent electrode layer
Implementation Method 3
The sequential stacking of the transparent electrode layer also includes a metal electrode layer made of Al or the like having light reflectivity... the light passes through the transparent electrode layer after being reflected by the metal electrode layer
Implementation Method 4
Thereafter, the light passes through the transparent substrate and is then output from a boundary surface between the transparent substrate and ambient air, functioning as a light exit surface
Data Source
AI summary
A transparent luminescent sheet and a lamp apparatus using the same are disclosed. The transparent luminescent sheet realizes a lamp function through emission of light from a sheet thereof configured to be transparent and secures a desired luminous efficacy and a desired freedom of design. In the transparent luminescent sheet, transparency is enhanced in a turn-off state and, as such, visibility is secured at the inside and the outside. A lit image is realized through light during a light emission operation. In addition, light emitted toward the inside is shielded or reduced, thereby preventing indoor dazzling.