Air Floating Video Display Uniform Luminance Control
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Solution Overview
Problem
Existing air floating video display apparatuses experience varying brightness due to differences in display position, causing discomfort for users as the total light amount changes, leading to non-uniform luminance.
Innovation Solution
The air floating video display apparatus includes a video display and a retro-transmitting plate that adjusts the light emission amount per unit area based on the light path length, using a double-layer type retro-transmitting optical plate and a backlight unit with a diffusion plate or LED units to create a gradient in light emission, ensuring uniform luminance across the display surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display position of the aerial video is changed, then the viewing angle and display flexibility are improved, but the total light amount taken into the light transmitting surface changes causing brightness variation
Solution Approach 1:
The patent applies local quality by varying the light emission amount per unit area at different positions on the display surface. Specifically, regions with longer light path lengths (which would receive less light) are compensated by increasing their light emission amount, while regions with shorter path lengths emit less light. This spatially differentiated light emission strategy maintains uniform brightness across the aerial video regardless of display position.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the light emission amount per unit area based on the light path length from each display surface position to the aerial video position. The video display controller modifies the luminance parameters of different regions according to calculated path lengths, ensuring that the total light amount reaching the light transmitting surface remains constant even when display position changes.
2Adaptability or versatility
If the light path length varies across the display surface, then the optical design flexibility is improved, but the luminance uniformity deteriorates due to different total light amounts
Solution Approach 1:
The patent applies local quality by varying the light emission amount per unit area at different positions on the display surface. Specifically, regions with longer light path lengths (which would receive less light) are compensated by increasing their light emission amount, while regions with shorter path lengths emit less light. This spatially differentiated light emission strategy maintains uniform brightness across the aerial video regardless of display position.
Solution Approach 2:
The patent implements a feedback mechanism where the video display controller calculates the light path length from each position on the display surface to the aerial video position, then uses this information to adjust the light emission amount per unit area accordingly. This closed-loop control ensures that variations in optical path length do not result in luminance non-uniformity.
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 configuration enhances the uniformity of the air floating image's luminance, reducing luminance decreases and providing a more comfortable viewing experience by maintaining consistent brightness regardless of the display position.
Implementation Method 1
a retro-transmitting plate transmitting video light emitted from the video display to form an air floating video
Implementation Method 2
the video display is configured to change a light emission amount per unit area in accordance with the light path length
Data Source
AI summary
A more favorable air floating video display apparatus is provided. This technique contributes to the Sustainable Development Goals that are “the third goal: Good Health and Well-being (for all people)”, “the ninth goal: Industry, Innovation and Infrastructure” and “the eleventh goal: Sustainable Cities and Communities”. The air floating video display apparatus includes: a video display; and a retro-transmitting plate transmitting video light emitted from the video display to form an air floating video, a light path length of video light having been emitted from a display surface of the video display through the retro-transmitting plate to a position of the air floating video changes depending on a position on the display surface of the video display from which the video light is emitted, and the video display is configured to change a light emission amount per unit area to depend on the light path length.