Transparent Projection Screen Gain Control for Halation Reduction
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Solution Overview
Problem
Existing video image display systems using transmissive transparent screens face challenges in balancing the visibility of advertisements from outside and the external scene for passengers, with high haze leading to halation and reduced visibility, especially at night or in dark conditions.
Innovation Solution
A video image display system with a transmissive transparent screen having a visible light transmittance of at least 5% and a haze of no more than 30%, equipped with a light control layer that adjusts screen gain and haze between scattering and transmitting states, and a projection device with luminance adjustment, ensuring optimal visibility of both the external scene and video images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the haze of the transmissive transparent screen is increased to enhance video image visibility, then the visibility of video images from outside is improved, but halation increases and reduces image clarity
Solution Approach 1:
The light control layer provides dynamic control over the haze parameter. When video images are being projected, the layer transitions to a scattering state with higher haze (screen gain G ≥ 0.05) to enhance the visibility of projected images from outside. When video projection is not active, it transitions to a transmitting state with lower haze (haze Hz ≤ 30%) to minimize halation and maintain clear visibility of the external scene for passengers.
Solution Approach 2:
The system dynamically adjusts the haze parameter of the transparent screen based on operational conditions. The light control layer enables the haze to be changed between a higher state (for video display enhancement) and a lower state (for minimizing halation and maintaining scene visibility), allowing the system to optimize image quality under different operating modes.
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 system effectively reduces halation and maintains excellent visibility of video images from outside while ensuring passengers can see the external scene clearly, even with high haze, by controlling light transmittance and screen gain.
Implementation Method 1
a light control layer that adjusts screen gain and haze between scattering and transmitting states
Implementation Method 2
having a visible light transmittance of at least 5% and displaying video images projected from the projection device
Data Source
AI summary
The visibility of the external scene from the inside of the transmissive transparent screen when the video image is not displayed and the visibility of the video image from the outside when the video image is displayed are satisfied.In a video image display system comprising a projection device 100 and a transmissive transparent screen 1 having a first surface and a second surface on the opposite side of the first surface, having a visible light transmittance of at least 5[%], and displaying video images projected from the projection device 100 installed on the first surface side, as video images visible to an observer on the second surface side, the following formula 1 is satisfied:−1.5≤ln(((B/A)/I)×G)≤3.9 Formula 1in the formula 1, A is the projection area [m2] of the projection device 100, B is the luminous flux [lm] projected onto A by the projection device 100, I is the ambient illuminance [lx] at the side of the second surface, and G is the screen gain of the transparent screen 1.