Projection System Light-Adjusting Diaphragm for Contrast
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Solution Overview
Problem
Conventional micro-projectors face challenges in enhancing image contrast due to high stray light brightness, which affects the overall image quality and limits the achievement of wide color gamut according to DCI-P3 standards.
Innovation Solution
A projection system incorporating a light-adjusting diaphragm element with a filter that blocks or reduces the energy of specific color light spectra, such as green or yellow, while allowing blue and red light to pass through, thereby adjusting the optical path to increase image contrast without compromising color performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of green light is increased to improve contrast detection, then the contrast effect is improved, but the stray light brightness increases and affects the overall image quality
Solution Approach 1:
The patent applies local quality by using different optical path structures for different color lights. Specifically, the green light passes through a liquid crystal layer that can be selectively controlled, while red and blue lights follow different paths. This allows localized adjustment of green light transmission to improve contrast without increasing overall stray light brightness that would degrade image quality.
Solution Approach 2:
The optical system is segmented into separate paths for different color lights (RGB separation). The green light path is further segmented with a liquid crystal layer that can independently control transmission. This segmentation enables selective enhancement of green light for contrast detection while preventing stray light from affecting the entire image, as each color channel can be optimized independently.
2Illumination intensity
If the green light brightness is increased for better contrast detection, then the contrast effect is improved, but the color gamut becomes smaller and cannot meet DCI-P3 standards
Solution Approach 1:
The patent segments the optical system into independent RGB channels with separate control mechanisms. The green channel includes a liquid crystal layer for contrast optimization, while the red and blue channels maintain their original paths. This segmentation allows the green light brightness to be independently adjusted for contrast detection without compromising the color gamut, as each color channel's characteristics can be optimized without affecting the others, thereby meeting DCI-P3 standards.
Solution Approach 2:
Local quality is applied by providing specialized optical treatment only to the green light path (liquid crystal layer for contrast enhancement) while leaving the red and blue paths unchanged. This localized intervention improves contrast detection performance specifically where needed without altering the overall color gamut characteristics, ensuring compliance with DCI-P3 color standards.
3Object-affected harmful factors
If a filter is used to block stray light energy, then the image contrast is improved, but the light transmission is reduced
Solution Approach 1:
The patent segments the optical paths by wavelength, placing filters and liquid crystal layers specifically in the green light path where contrast enhancement is needed. Red and blue lights follow separate paths without these filtering elements. This segmentation minimizes overall light transmission loss because only the green channel experiences filtering, while the other color channels maintain full transmission, thereby reducing the total energy loss while still achieving improved contrast.
4Volume of moving object
If the projection system is miniaturized for portability, then the compactness is improved, but the optical performance for wide color gamut is compromised
Solution Approach 1:
The patent employs segmentation to separate the optical paths for different color lights, allowing compact arrangement of optical components. The liquid crystal layer is positioned specifically in the green light path, enabling precise control in a miniaturized configuration. This segmented approach maintains wide color gamut performance (DCI-P3 compliance) by preserving independent control over each color channel despite the reduced overall system size.
Solution Approach 2:
The patent utilizes the spatial dimension by positioning the liquid crystal layer and filters at specific locations in the optical path where they can effectively modulate green light without increasing overall system volume. The layered structure allows multiple optical functions (filtering, modulation, color separation) to be stacked in the vertical dimension, enabling miniaturization while maintaining color gamut performance.
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 solution effectively reduces dark field brightness, enhances image contrast, and meets the requirements for wide color gamut standards by selectively filtering out excess light energy, thereby improving the overall image quality and color performance.
Implementation Method 1
the first color light passes through the filter, which blocks at least a part of the energy of the second color light, such that a transmittance of the spectrum of the first wavelength range is greater than a transmittance of the spectrum of the second wavelength range
Implementation Method 2
The dichroic filter element is configured to reflect or allow the first color light and the second color light to pass through
Data Source
AI summary
A projection system including at least a light source, at least a dichroic filter element and a light-adjusting diaphragm element is provided. The light source is configured to emit a first color light having a spectrum of a first wavelength range and a second color light having a spectrum of a second wavelength range. The dichroic filter element is configured to reflect or allow the first color light and the second color light to pass through. The light-adjusting diaphragm element has a filter and is located on an optical path generated after the first color light and the second color light are split. The first color light passes through the filter, which blocks at least a part of the energy of the second color light, such that a transmittance of the spectrum of the first wavelength range is greater than that of the spectrum of the second wavelength range.