Three-Source Projector Optics for Compact Color Synthesis
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Solution Overview
Problem
Existing three-panel projectors require a color separating/synthesizing optical system, increasing the number of components and size, and there is a need to improve the utilization efficiency of color light.
Innovation Solution
A projector design utilizing three light sources emitting different wavelength bands, each with a light guide element to equalize in-plane illumination intensity, collimating elements, and optical modulating elements to modulate light based on image information, followed by a photosynthetic element to synthesize and project the light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a color separating/synthesizing optical system is added to the three-panel projector, then the image quality and color accuracy are improved, but the number of components increases and the device size increases
Solution Approach 1:
The patent combines the light guide function and color separation function into a single integrated optical system. The light guide plate serves dual purposes: guiding light from the光源 and separating colors through its internal structure, eliminating the need for separate color separating prisms or dichroic mirrors while maintaining color accuracy.
Solution Approach 2:
The light guide plate is designed to perform multiple functions simultaneously: light guidance, color separation, and illumination uniformity adjustment. This multi-functional design reduces the overall component count while achieving the same optical effects as traditional multi-component systems.
2Measurement precision
If a color separating/synthesizing optical system is added to the three-panel projector, then the image quality and color accuracy are improved, but the device size increases
Solution Approach 1:
The patent combines the light guide function and color separation function into a single integrated optical system. The light guide plate serves dual purposes: guiding light from the光源 and separating colors through its internal structure, eliminating the need for separate color separating prisms or dichroic mirrors while maintaining color accuracy.
Solution Approach 2:
The patent transitions from a traditional multi-component three-dimensional arrangement to a planar light guide plate structure. By implementing color separation within the plane of the light guide plate rather than through stacked optical components, the device achieves compact size while maintaining color separation functionality.
3Device complexity
If traditional white light source with color separation is used, then the system is simple in structure, but the utilization efficiency of color light is low
Solution Approach 1:
The patent changes the fundamental parameter of the light source from broad-spectrum white light to wavelength-specific light sources (LEDs or lasers for each primary color). This parameter change enables direct illumination of corresponding liquid crystal panels without color separation, dramatically improving light utilization efficiency while maintaining structural simplicity through the light guide plate integration.
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
Reduces the number of components and size while enhancing the utilization efficiency of color light, achieving effective image projection.
Implementation Method 1
a first light guide element including a first incidence end on which the first light emitted from the first light source is incident and a first emission end from which the first light is emitted, and being configured to equalize an in-plane illumination intensity of the first light
Implementation Method 2
a first collimating element configured to collimate the first light emitted from the first light guide element
Implementation Method 3
a first optical modulating element configured to modulate the first light emitted from the first collimating element, based on image information
Implementation Method 4
a photosynthetic element configured to synthesize and emit the first light emitted from the first optical modulating element, the second light emitted from the second optical modulating element, and the third light emitted from the third optical modulating element
Data Source
AI summary
In a projector, a first light in a first wavelength band and emitted from a first light source sequentially passes through a first light guide element and a first collimating element, and is incident on a photosynthetic element; a second light in a second wavelength band and emitted from a second light source sequentially passes through a second light guide element and a second collimating element, and is incident on the photosynthetic element; a third light in a third wavelength band and emitted from a third light source sequentially passes through a third light guide element and a third collimating element, and is incident on the photosynthetic element; and a first optical modulating element is provided with a reflection portion on a first surface side on which the first light is incident and in a region other than an opening portion of a display region.