Room Polarizing Plates for Projector Contrast
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Solution Overview
Problem
Conventional projectors struggle to maintain high contrast in images projected under bright environments due to ambient light interference.
Innovation Solution
A room design incorporating polarizing plates on windows and projection surfaces, with absorption axis directions perpendicular or parallel to each other, and featuring retardation layers for circular or elliptical polarization, to manage sunlight entry and enhance image contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a projector is used under a bright environment, then the projector can be operated without darkening the room, but the projected image contrast deteriorates due to ambient light interference
Solution Approach 1:
The invention converts the harmful ambient light into a beneficial factor by using polarizing plates. The polarizing plate on the window blocks polarized ambient light while allowing the projector's polarized image light to pass through, thereby converting ambient light from a harmful interference into a controllable factor that can be selectively filtered.
Solution Approach 2:
The invention changes the polarization state parameter of light to differentiate between ambient light and projected image light. By equipping the window and screens with polarizing plates having specific absorption axis directions, the system selectively transmits or blocks light based on its polarization state, maintaining image contrast without requiring room darkening.
2Manufacturing precision
If polarizing plates are arranged on the window and projection surfaces with perpendicular absorption axis directions, then ambient light is blocked and image contrast is improved, but the device complexity increases
Solution Approach 1:
The polarizing plates serve multiple functions simultaneously: they act as sunlight blockers on windows, image projection surfaces on screens, and contrast enhancement elements when combined. This multi-functionality reduces the need for separate components and justifies the added complexity by delivering multiple benefits from a single element.
Solution Approach 2:
The invention uses composite optical structures combining polarizing plates with windows and projection screens. These composite elements integrate light-blocking and image-projection functions into unified components, optimizing performance while managing the complexity through standardized composite units.
3Object-affected harmful factors
If polarizing plates with parallel absorption axis directions are used, then sunlight entry is controlled, but the projected image brightness may be reduced
Solution Approach 1:
The invention applies different polarizing plate configurations to different locations based on local requirements. Windows use polarizing plates oriented to block sunlight while allowing projected light through, while projection screens use configurations optimized for image brightness. This localized optimization ensures both sunlight control and image quality are maintained in their respective positions.
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 allows for clear, high-contrast projector images even in bright environments by strategically positioning polarizing plates on windows and screens to control light entry and polarization.
Implementation Method 1
An inner side of the window, and a projection-side surface of the first screen and/or a projection-side surface of the second screen each have arranged thereon a polarizing plate. An absorption axis direction of a polarizer of the polarizing plate of the window, and an absorption axis direction of a polarizer of the polarizing plate of the first screen and/or an absorption axis direction of a polarizer of the polarizing plate of the second screen are substantially perpendicular or parallel to each other.
Implementation Method 2
An absorption axis direction of a polarizer of the polarizing plate of the window, and an absorption axis direction of a polarizer of the polarizing plate of the first screen
Implementation Method 3
the polarizing plate of the window, and the polarizing plate of the first screen and/or the polarizing plate of the second screen each further have a retardation layer having an in-plane retardation Re(550) of from 100 nm to 200 nm, and each have a circular polarization or elliptical polarization function
Data Source
AI summary
The room includes: a ceiling; a floor; and a wall having a pair of wall surfaces opposite to each other, and another pair of wall surfaces opposite to each other in a direction intersecting the pair of wall surfaces. One of the pair of wall surfaces and the other pair of wall surfaces has a window. The wall surface opposite to the wall surface having the window has arranged thereon a first screen. An inner side of the window, and a projection-side surface of the first each has arranged thereon a polarizing plate. An absorption axis direction of a polarizer of the polarizing plate of the window, and an absorption axis direction of a polarizer of the polarizing plate of the first screen and/or an absorption axis direction of a polarizer of the polarizing plate of the second screen are substantially perpendicular or parallel to each other.