Display Device Light Guide Air Layer Uniformity
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Solution Overview
Problem
Display devices with light modulating elements experience non-uniform brightness and darkness due to insufficient mixing of light from multiple light emitting elements, leading to visual recognition of stripe non-uniformity and degradation in display quality.
Innovation Solution
A display device configuration featuring a polymer dispersed liquid crystal layer with a first and second light emitting module, where each module includes light sources and light guides with air layers between their end surfaces, enhancing light diffusion and reflection to improve light distribution and contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light from multiple light emitting elements propagates inside the light guide while diffusing, then light distribution is improved, but brightness and darkness of light may be visually recognized as non-uniformity in stripe
Solution Approach 1:
The light guide is divided into multiple sections with different refractive indices arranged in an alternating pattern. This segmentation allows different regions to handle light diffusion and uniformity differently, preventing stripe non-uniformity while maintaining overall light distribution quality.
Solution Approach 2:
Different regions of the light guide are assigned different refractive indices to perform specific functions locally. Areas near light emitting elements use one refractive index configuration to manage light propagation, while other areas use different configurations to ensure uniform diffusion, addressing local lighting requirements specifically.
2Illumination intensity
If a light modulating element with scattering property is used, then light diffusion is enhanced, but brightness and darkness become visually recognizable as non-uniformity
Solution Approach 1:
The refractive index parameter of the light guide is varied in an alternating pattern to control light scattering and diffusion. By changing this physical parameter spatially, the system achieves enhanced light diffusion while preventing the formation of visible brightness stripes that would occur with uniform refractive index materials.
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 effectively suppresses the spread of light, increasing illumination in desired areas, reducing light in peripheral areas, and maintaining high contrast and color purity, thereby enhancing display quality and preventing deterioration.
Implementation Method 1
the light modulating element includes a polymer dispersed liquid crystal layer as a light modulating layer. The light modulating element is disposed behind a light guide and scatters incident light from a side surface of the light guide
Implementation Method 2
an end surface of the first light guide and an end surface of the second light guide face each other with an air layer interposed therebetween
Data Source
AI summary
According to one embodiment, a display device includes a display panel having a first side surface extending along a first direction and including a polymer dispersed liquid crystal layer, and a first light emitting module provided along the first side surface. The first light emitting module includes a plurality of first light sources arranged in the first direction, a plurality of second light sources arranged in the first direction, a first light guide provided between the plurality of first light sources and the first side surface, and a second light guide provided between the plurality of second light sources and the first side surface, and an end surface of the first light guide and an end surface of the second light guide face each other with an air layer interposed therebetween.