Transparent Display Light Homogenization via Optical Space
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Solution Overview
Problem
Conventional transparent display technology faces challenges in maintaining clarity and manufacturing efficiency due to the need for microstructures on light guide plates, which can interfere with TFT arrays and increase costs, especially in large-area configurations.
Innovation Solution
A transparent display device design where light from a light emitting assembly enters an optical space between a transparent plate and a transmissive light valve panel at a large angle, with a significant portion being reflected and then passing through, mimicking a uniform surface light source, eliminating the need for microstructures on the transparent plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If microstructures are formed on the light guide plate to homogenize backlight, then light distribution is improved, but the clarity of objects behind the transparent display device deteriorates and manufacturing complexity increases
Solution Approach 1:
The patent removes the light guide plate with microstructures from the transparent display device structure. Instead, it uses a transparent plate without microstructures combined with a transmissive light valve panel and specific optical films to achieve light homogenization, thereby eliminating the interference pattern issue while maintaining backlight uniformity
Solution Approach 2:
The patent introduces optical films (diffusion film and/or prism film) as intermediaries between the backlight unit and display panel to homogenize light. These optical films serve as mediators that achieve uniform light distribution without requiring microstructures on the transparent plate, thus avoiding interference patterns and maintaining object clarity
2Illumination intensity
If microstructures are made dense to improve light homogenization, then backlight uniformity is improved, but the clarity of objects behind the display deteriorates
Solution Approach 1:
The patent extracts and removes the microstructure element from the light guide plate entirely. The light homogenization function is transferred to dedicated optical films, allowing the transparent plate to remain free of microstructures and thus maintain high object clarity while achieving uniform backlight through the optical films
3Ease of manufacture
If the size of microstructures is increased to simplify manufacturing, then manufacturing complexity is reduced, but light homogenization performance deteriorates
Solution Approach 1:
The patent uses optical films as intermediary components to perform the light homogenization function. These films can be manufactured using conventional techniques without requiring precise microstructure fabrication, thus simplifying the manufacturing process while maintaining effective light distribution uniformity
4Illumination intensity
If optical film is disposed between light guide plate and display panel to homogenize light, then light distribution is improved, but interference patterns with TFT array occur
Solution Approach 1:
The patent removes the light guide plate that causes the interference pattern issue. The light homogenization function is achieved through optical films positioned differently in the optical path, eliminating the source of interference while maintaining the desired light distribution uniformity
Solution Approach 2:
The patent repositions and reconfigures the optical films to serve as intermediaries that homogenize light without creating interference patterns with the TFT array. By changing the optical path configuration and removing the light guide plate, the harmful interference is eliminated while the beneficial light homogenization is preserved
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 design enhances clarity by allowing objects behind the display to be clearly visible, simplifies production, reduces costs, and improves manufacturing yield by avoiding microstructure-related interference and complexity.
Implementation Method 1
the major portion of the light is reflected by the transparent plate and then passes through the transmissive light valve panel
Data Source
AI summary
A transparent display device includes a transmissive light valve panel, a transparent plate and at least one light emitting assembly. The transmissive light valve panel has a display surface. The transparent plate is disposed with respect to the transmissive light valve panel to form an optical space between the transparent plate and the transmissive light valve panel. The at least one light emitting assembly is disposed beside the optical space and adapted to generate light into the optical space. A light pattern of the light emitted from the light emitting assembly and directed to the optical space has at least one maximum peak in an angular range of ±15° with respect to a direction parallel to the display surface of the transmissive light valve panel.