Projector Light Source with Movable Bandpass Filter
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Solution Overview
Problem
Conventional projectors using dichroic mirrors to separate white light into R, G, and B light suffer from decreased light use efficiency due to different optical path lengths and illuminated areas for each color, leading to inefficiencies in light utilization.
Innovation Solution
A projector design incorporating a light source apparatus with fluorescence, a bandpass filter, an integrator unit, a superimposing lens, a light modulator with sub-pixels, and a microlens array, where the bandpass filter can be moved to adjust image display modes, ensuring equal optical path lengths and areas for R, G, and B light, enhancing light use efficiency and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If dichroic mirrors are used to separate white light into R, G, and B light, then color separation is achieved, but light use efficiency decreases due to different optical path lengths and illuminated areas
Solution Approach 1:
The patent removes the dichroic mirrors from the optical system and extracts only the necessary light separation function, replacing it with a simpler color separation approach that maintains equal optical path lengths for all colors, thereby improving light use efficiency without the complexity of multiple angled mirrors
Solution Approach 2:
The patent designs the optical path so that red, green, and blue light travel equal distances from the light source to the display panel, creating equipotential optical paths that eliminate the efficiency loss caused by different path lengths and illuminated areas in traditional dichroic mirror systems
2Loss of energy
If different optical path lengths are used for R, G, and B light, then color separation is achieved, but the illuminated areas have different sizes resulting in decreased light use efficiency
Solution Approach 1:
The patent implements equal optical path lengths for all color components by designing a symmetric optical configuration where red, green, and blue light traverse identical distances, ensuring uniform illuminated areas and maximizing light use efficiency without compromising color separation quality
3Manufacturing precision
If a bandpass filter is placed in the optical path to improve color purity, then color gamut is enhanced, but brightness is reduced
Solution Approach 1:
The patent employs a movable bandpass filter that can be dynamically positioned in or out of the optical path, allowing the system to switch between color purity mode (filter in position) and brightness mode (filter out position), providing adaptive optimization based on display requirements
Solution Approach 2:
The patent enables periodic switching between different filter positions to alternate between color gamut priority and brightness priority display modes, allowing the system to cycle through different operational states depending on the intended use scenario
4Adaptability or versatility
If the bandpass filter is fixed in the optical path, then color purity is maintained, but the projector cannot adapt to different image display modes
Solution Approach 1:
The patent transforms the static bandpass filter into a dynamic component that can be moved between different positions, enabling the projector to adapt to various image display modes (color gamut priority, brightness priority, etc.) while maintaining a relatively simple mechanical structure for filter positioning
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 improves light use efficiency and color purity by ensuring equal optical path lengths and areas for R, G, and B light, allowing for flexible image display modes prioritizing either color gamut or brightness, thus enhancing the overall image quality.
Implementation Method 1
a light source apparatus that outputs a light ray flux containing fluorescence
Implementation Method 2
a bandpass filter provided at least in part of an optical path of the fluorescence
Implementation Method 3
an integrator unit on which the light ray flux is incident and which divides the light ray flux into a plurality of light fluxes
Implementation Method 4
a microlens array including a plurality of microlenses corresponding to the plurality of pixels
Data Source
AI summary
The present disclosure relates to a projector including a light source apparatus that outputs a light ray flux containing fluorescence, a bandpass filter provided at least in part of an optical path of the fluorescence, an integrator unit on which the light ray flux is incident and which divides the light ray flux into a plurality of partial light ray fluxes, a superimposing lens that is provided on the downstream of the integrator unit and causes the plurality of partial light ray fluxes to be incident in different positions, a light modulator including a plurality of pixels, a microlens array including a plurality of microlenses corresponding to the plurality of pixels, and a projection optical apparatus that projects light outputted from the light modulator.