Polymer Film Light Filter Modulator for High Efficiency Displays
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Solution Overview
Problem
Current display technologies, such as LCD and DMD, face issues with low light and energy efficiency, poor picture quality, and high production costs due to the need for polarization and color absorbance filters, as well as the requirement for multiple light valves and electronic parts, which limits resolution, brightness, and color gamut.
Innovation Solution
A light filter system using a polymer film that changes thickness in response to an electric field, varying the optical path length between semi-reflective surfaces to achieve multiple beam interference, thereby eliminating the need for polarization and color absorbance filters and reducing the number of electronic parts required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If polarization filters and color absorbance filters are used in LCD displays, then light can be filtered and modulated, but light efficiency decreases significantly with only about 5% of source light transmitted
Solution Approach 1:
The patent changes the fundamental parameter of light filtering from absorption-based (LCD) to interference-based (Fabry-Perot). By using constructive and destructive interference of light waves between two reflective surfaces, the system transmits desired wavelengths without absorbing light, achieving over 90% light efficiency compared to LCD's 5% transmission
Solution Approach 2:
The patent replaces the mechanical/electrical system of LCD (requiring polarizers, color filters, and liquid crystal molecules) with an optical interference system using only two reflective surfaces and a controllable gap. This substitution eliminates the need for light-absorbing components and complex electronic control circuits
2Adaptability or versatility
If multiple light valves and electronic parts are used to achieve full color control, then color accuracy can be maintained, but device complexity increases and production costs rise
Solution Approach 1:
The patent makes a single Fabry-Perot filter structure universal for controlling all colors by dynamically changing the gap distance. By adjusting the gap between the two reflective surfaces, the filter can transmit any wavelength across the visible spectrum, replacing the need for separate red, green, and blue light valves or color wheels
Solution Approach 2:
The patent merges the functions of multiple color filters and light valves into a single interference filter structure. The combination of two reflective surfaces with a controllable gap creates a universal wavelength selector that can replace entire subsets of optical components used in traditional projection systems
3Illumination intensity
If absorbance filters are used to control color, then color selection is achieved, but brightness and color gamut are limited due to light absorption
Solution Approach 1:
The patent converts the typically harmful effect of light absorption into beneficial light reflection and interference. Instead of absorbing light to filter colors, the system uses reflective surfaces to create constructive interference for desired wavelengths and destructive interference for unwanted wavelengths, preserving brightness while achieving color control
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 solution enhances light efficiency, provides superior picture quality with higher resolution and wider color gamut, reduces energy consumption, and lowers production costs by eliminating the need for unnecessary filters and electronic components, while allowing for full color control within one light valve.
Implementation Method 1
a polymer film that changes thickness in response to an electric field, varying the optical path length between semi-reflective surfaces to achieve multiple beam interference
Implementation Method 2
Light filters that use multiple beam interference by varying a light beam's optical path length between semi-reflective surfaces
Data Source
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AI summary
A light filter or an array of filters can be either one or two dimensional. The filter or filters use multiple beam interference by varying an optical path length between semi-reflective surfaces. The optical path length between the semi-reflective surfaces is varied by changing a thickness of a polymer film in response to an electric field formed between two semi-transparent electrodes. The filter can be configured in either a transmissive or reflective mode.