Dual-Mode Display Device with Electrochromic and Photoluminescent Layers
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Solution Overview
Problem
Existing display devices face challenges with complex structure and reduced portability due to separate formation of liquid crystal and organic electroluminescence elements, low solubility of electric field light-emitting materials with liquid crystals, and the need for multiple transparent electrodes, leading to inferior light-emitting properties and image quality.
Innovation Solution
A display device comprising a pair of substrates with electrodes and a material layer containing a coloring material that changes color under voltage and a light-emitting material that emits light upon photoexcitation, allowing for both reflective and light-emission types without a complicated structure, using a solvent and supporting electrolyte to maintain these materials and control energy migration between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If liquid crystal display device and organic electroluminescence element are separately formed, then both reflective and light emission types can be achieved, but structure and production process become complicated and thickness increases
Solution Approach 1:
The patent combines liquid crystal and organic electroluminescence materials into a single material layer 4 that can function as both reflective and light emission display types. The material layer contains both coloring material (liquid crystal) and light-emitting material (organic electroluminescence), eliminating the need for separate elements and reducing structural complexity while maintaining display type versatility.
Solution Approach 2:
The material layer 4 is designed to perform multiple functions: it can operate as a reflective display using the coloring material, as a light emission display using the light-emitting material, and can control light transmission. This multi-functional design allows a single element structure to replace what would traditionally require separate display elements.
2Illumination intensity
If electric field light-emitting material is mixed with liquid crystal material, then light emission property can be achieved, but solubility is low and liquid crystal phase transition temperature decreases
Solution Approach 1:
The patent uses a composite material system where electric field light-emitting material and liquid crystal material are combined in a material layer with a solvent. The solvent acts as a medium to achieve sufficient solubility of both materials, allowing them to coexist in the same layer without phase separation while maintaining their individual functional properties.
Solution Approach 2:
The solvent functions as an intermediary substance that facilitates the mixing and solubility of electric field light-emitting material and liquid crystal material. By providing a common medium, the solvent enables both materials to be dissolved and distributed uniformly in the material layer, overcoming their inherent low solubility when mixed directly.
3Adaptability or versatility
If multiple transparent electrodes are prepared on substrate, then both display types can be controlled, but structure becomes complicated and additional layers are required
Solution Approach 1:
The electrodes 21, 31 are designed to serve multiple functions: they control both the coloring material for reflective display and the light-emitting material for light emission display. By applying voltage to the electrodes, the system can switch between different display modes without requiring separate electrode structures for each function.
4Stability of the object's composition
If light-emitting material anti-diffusion layer is provided between light-emitting layer and coloring layer, then material diffusion can be prevented, but structure and production process become complicated
Solution Approach 1:
The patent uses a composite material approach where the solvent and supporting electrolyte create a stable medium that prevents diffusion between light-emitting material and coloring material. The supporting electrolyte specifically stabilizes the electric field light-emitting material, preventing it from diffusing into the coloring material region while maintaining material solubility and functionality.
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 configuration prevents the complexity of element structures while maintaining high-quality display performance and portability, enabling both reflective and light-emission modes without the need for additional masks or complex electrode arrangements.
Implementation Method 1
a coloring material which changes color upon the application of a voltage
Implementation Method 2
a light-emitting material which emits light upon photoexcitation
Data Source
AI summary
Disclosed is a high quality display device which avoids complicated element structure, and does not unnecessarily reduce portability. The display device comprises: a pair of substrates which are disposed facing each other, and on each of which electrodes are formed; and a material layer which is sandwiched between the pair of substrates. The material layer contains: a coloring material which changes color upon the application of a voltage; and a light-emitting material which emits light upon photoexcitation.