Transparent Display Electrode Merging for Bright Environment Visibility
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Solution Overview
Problem
Existing display devices face challenges in maintaining visibility when the amount of external light is greater than the light emitted by the display, making it difficult to see the displayed information effectively.
Innovation Solution
A double-sided transparent display device configuration that includes a first substrate with light emitting pixels, a first internal layer, a second substrate, a liquid crystal layer, and specific electrode arrangements to manage light emission, reflection, and transmission, allowing for improved visibility by integrating organic EL (OLED) and reflective displays to handle both internal and external light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a double-sided light emission type light emitting layer is used to enable display on both surfaces, then the display can transmit external light from one surface to the other, but when external light amount is larger than light from the light emitting layer, visibility of the display becomes poor
Solution Approach 1:
The patent combines a light emitting display device with a reflective display device into a single integrated structure. The light emitting pixels (OLED) and reflective pixels share the same substrate and electrode structure, allowing the display to function in both light emitting and reflective modes depending on external light conditions, thereby resolving the visibility problem in bright environments.
Solution Approach 2:
The display device dynamically switches between light emitting mode and reflective mode based on ambient light conditions. The same pixel structure can emit light when needed while also reflecting external light, providing adaptive visibility control without requiring separate display systems for different lighting conditions.
2Illumination intensity
If a reflective electrode is placed between light emitting pixels and liquid crystal layer, then light reflection is improved for visibility, but the electrode structure becomes more complex
Solution Approach 1:
The first electrode serves dual functions as both a light emitting electrode for the OLED and a reflective electrode for the reflective display mode. This merged electrode structure eliminates the need for separate reflective electrodes, reducing device complexity while maintaining effective light reflection.
Solution Approach 2:
The first electrode is designed to perform multiple functions: emitting light during light emitting display mode and reflecting external light during reflective display mode. This multi-functional electrode design simplifies the overall device structure by eliminating redundant 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 solution enhances visibility by enabling the display device to function effectively in environments with varying light conditions, improving the visibility of both internal and external scenes without increasing display luminance, even in bright environments.
Implementation Method 1
integrating organic EL (OLED) and reflective displays to handle both internal and external light conditions
Implementation Method 2
The first electrode is located between at least one of the plurality of light emitting pixels and the liquid crystal layer in the first cross section, the first electrode reflecting visible light
Implementation Method 3
The liquid crystal layer is located between the first substrate and the second substrate in a first cross section that is a cross section in a direction perpendicular to the first surface
Implementation Method 4
The first substrate includes a first surface and a second surface on an opposite side of the first surface, the first substrate transmitting visible light in a direction perpendicular to the first surface and the second surface
Data Source
AI summary
A display device according to the present disclosure includes first and second substrates transmitting visible light, light emitting pixels, a first internal layer, a liquid crystal layer, a first electrode reflecting visible light, and second to fourth electrodes transmitting visible light. The light emitting pixels independently emit light. The liquid crystal layer is located between the first and second substrates. The first electrode is located between at least one of the light emitting pixels and the liquid crystal layer. The second electrode is located between the liquid crystal layer and the first substrate without overlapping the first electrode in plan view. The third electrode is located between the liquid crystal layer and the second substrate while overlapping the first electrode in plan view. The fourth electrode is located between the liquid crystal layer and the second substrate while overlapping the second electrode in plan view.