Transmissive Screen Light Control Layer Reduces Reflection Scattering
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Solution Overview
Problem
Transmissive screens used in image display apparatuses suffer from front scattering and back reflection scattering, leading to inverted images and reduced display effectiveness, especially when character information is displayed or when images on both surfaces are not synchronized.
Innovation Solution
A transmissive screen design incorporating a light control layer with a liquid crystal compound of specific birefringence, a refractive index adjusting layer between transparent electrode and base materials, and an antireflection layer on the viewer side, which reduces reflection scattering and prevents inverted image viewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transmissive screen uses front scattering light control, then image display on the front surface is achieved, but back reflection scattering causes inverted images to appear on the rear surface
Solution Approach 1:
The patent changes the refractive index parameter by introducing a refractive index adjusting layer with a specific refractive index (1.3-1.7) between the transparent electrode layer and transparent base material. This parameter adjustment reduces the reflection at the interface and suppresses back reflection scattering, preventing inverted images from appearing on the rear surface while maintaining front scattering light control.
Solution Approach 2:
The patent introduces an intermediary refractive index adjusting layer between the transparent electrode layer and transparent base material. This intermediary layer mediates the optical interaction between the two layers, reducing the reflection coefficient at their interface and thereby suppressing back reflection scattering that causes inverted images.
2Adaptability or versatility
If both surfaces of the transmissive screen are used as display surfaces, then display versatility is improved, but overlapping images from both surfaces create noise and reduce display effect
Solution Approach 1:
The patent converts the harmful back reflection scattering into a beneficial effect by using the refractive index adjusting layer to control the light paths. The layer adjusts the optical properties to ensure that light projected on one surface does not create harmful inverted images on the other surface, allowing both surfaces to function as display surfaces without overlapping image noise.
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 significantly reduces reflection scattering towards the image source, ensuring that no inverted image is viewed, thereby enhancing the display effect and reducing noise from overlapping images on both surfaces.
Implementation Method 1
a liquid crystal compound having a birefringence of from 0.05 to 0.15 is selected as a liquid crystal compound to be incorporated into the light control layer
Implementation Method 2
a light control layer containing a liquid crystal compound, and capable of switching a light transmitting state and a light scattering state in accordance with a voltage to be applied thereto
Implementation Method 3
a refractive index adjusting layer is arranged at least between the transparent electrode layer and the transparent base material on a display surface side
Implementation Method 4
an antireflection layer is arranged at least on a viewer side of the transparent base material on the display surface side
Data Source
AI summary
The present invention provides a transmissive screen including a light control layer, the screen being reduced in reflection scattering toward an image source, and an image display apparatus using the transmissive screen.