Aerial Image Optics With Louvered Ghost Image Suppression
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Solution Overview
Problem
Aerial image formation devices often suffer from unintended ghost images that overlap with the intended image, reducing brightness and contrast, and existing solutions to suppress ghost images also diminish overall brightness.
Innovation Solution
An aerial image forming device with a display unit, a light diffusion control unit having a louver-shaped regular internal structure, and a light-transmitting image formation unit, which diffuses or transmits light based on incident angle to suppress ghost images while maintaining brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If an optical element (viewing angle control element/privacy film) is provided to block light at certain angles, then ghost image occurrence is suppressed, but overall brightness is reduced and contrast ratio is reduced
Solution Approach 1:
The patent changes the optical parameters of the light diffusion control unit by controlling the incident angle of light through the non-parallel arrangement of display surface and light diffusion control unit surfaces. This allows the same optical element to transmit useful light (aerial image) while blocking harmful light (ghost image), resolving the contradiction between ghost image suppression and brightness maintenance
Solution Approach 2:
The patent applies asymmetry by making the display surface and the surface of the light diffusion control unit non-parallel. This asymmetric arrangement creates different incident angles for light paths, enabling the optical element to differentiate between aerial image light and ghost image light, thus suppressing ghost images while maintaining brightness
2Object-generated harmful factors
If an optical element (viewing angle control element/privacy film) is provided to block light at certain angles, then ghost image occurrence is suppressed, but contrast ratio is reduced
Solution Approach 1:
The patent changes the incident angle parameter of light through the non-parallel surface arrangement, enabling the light diffusion control unit to selectively transmit aerial image light while blocking ghost image light. This parameter change maintains high contrast ratio by preventing ghost image overlap without uniformly reducing light transmission
Solution Approach 2:
The asymmetric non-parallel arrangement of surfaces creates different incident angles for different light paths. This allows the optical element to maintain high contrast ratio by blocking ghost image light (which would otherwise overlap with aerial image) while preserving aerial image light transmission
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
Effectively suppresses ghost images while maintaining sufficient brightness and contrast of the aerial image.
Implementation Method 1
the light diffusion control unit having a louver-shaped regular internal structure that includes a plurality of plate-shaped regions having a relatively high refractive index in a region having a relatively low refractive index
Data Source
AI summary
An aerial image forming device includes a display unit that has a display surface and emits light from the display surface; a light diffusion control unit that is disposed on the display surface side of the display unit and diffuses or transmits the light depending on its incident angle; and a light-transmitting image formation unit that is laminated on a surface side of the light diffusion control unit opposite to the display unit, transmits the light transmitted through the light diffusion control unit, and forms an image in a position on a surface side opposite to the light diffusion control unit. The light diffusion control unit has a louver-shaped regular internal structure that includes a plurality of plate-shaped regions having a relatively high refractive index in a region having a relatively low refractive index.