Light Source Apparatus Homogenization for Projection Uniformity
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Solution Overview
Problem
Conventional light source devices in projection technology suffer from poor color uniformity due to uneven light distribution, leading to color unevenness in projected images, particularly when the blue light is obliquely incident to the wavelength conversion device.
Innovation Solution
A light source device incorporating a fly-eye lens pair for light homogenization and imaging, combined with an optical path correcting assembly, ensures uniform light distribution by adjusting the optical axis of the reflected light to coincide with the incident light, even when the beam is obliquely incident, thereby maintaining uniformity and correcting for positional deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the blue light is obliquely incident to the wavelength conversion device, then the light utilization rate is improved, but the color uniformity deteriorates due to uneven light distribution
Solution Approach 1:
A fly-eye lens pair is introduced as an intermediary optical element between the incident blue light and the wavelength conversion device. The lens pair homogenizes the oblique incident light and corrects its optical path, ensuring uniform light distribution across the conversion device surface while maintaining high light utilization rate. This mediator resolves the contradiction by transforming the uneven oblique incident light into uniform illumination.
Solution Approach 2:
The optical path angle of the incident light is changed from a large oblique angle to a smaller angle through the fly-eye lens pair. By adjusting the optical path parameters (incident angle, distribution uniformity), the system achieves both high light utilization and uniform color distribution, resolving the contradiction between these two parameters.
2Device complexity
If the main optical axis of the reflected light does not coincide with the incident light, then the light path design is simplified, but the light spot uniformity deteriorates
Solution Approach 1:
The fly-eye lens pair serves as a mediator that corrects the optical path of reflected light, ensuring that the main optical axis of the reflected light coincides with the incident light. This intermediary element maintains light spot uniformity while allowing flexible optical path design, resolving the contradiction between design simplicity and uniformity.
3Manufacturing precision
If the fly-eye lens pair is used for light homogenization, then the light distribution uniformity is improved, but the device complexity increases
Solution Approach 1:
The fly-eye lens pair consists of multiple lens units arranged in a segmented pattern. Each lens unit independently processes a portion of the incident light, and their combined effect achieves uniform light distribution. This segmentation approach improves uniformity while keeping each individual lens unit simple, partially offsetting the increased device complexity.
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 improves light utilization and maintains uniformity of the light spot on the wavelength conversion device, ensuring consistent color distribution and reducing the impact of deflections or installation errors, resulting in a more uniform projected image.
Implementation Method 1
a first light source 201, a fly-eye lens pair 202, a light guiding system... The first exciting light L1 is homogenized by the fly-eye lens pair 202
Implementation Method 2
the wavelength conversion section absorbs the first exciting light L1 and emits excited light L3
Implementation Method 3
the first exciting light L1 is obliquely incident to a surface of the reflective section and is reflected to form second exciting light L2
Implementation Method 4
the collecting lens 205 is configured to collect the excited light L3 and the second exciting light L2
Data Source
Figure 1~2
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Figure 5~6
AI summary
Disclosed is a light source device, including a first light source (201), a fly-eye lens pair (202), a light guiding system and a wavelength conversion device (206). The first light source (201) emits first exciting light (L1) which is homogenized by the fly-eye lens pair and then incident to the light guiding system. The light guiding system guides the first exciting light (L1) to the wavelength conversion device (206). The wavelength conversion device (206) includes a wavelength conversion section and a reflective section. The wavelength conversion section absorbs the first exciting light (L1) and emits excited light (L3). The first exciting light (L1) is obliquely incident to the reflective section and is reflected to form second exciting light (L2). The light guiding system is also used for collecting the excited light (L3) and the second exciting light (L2) and guiding the excited light (L3) and the second exciting light (L2) to exit along an exiting light channel. The light guiding system includes an optical path correcting assembly (209) that is located on an optical path of the second exciting light (L2), reflects the second exciting light (L2) in such a manner that main optical axes of the reflected second exciting light and he excited light coincide. The fly-eye lens pair (202) includes first and second lens arrays arranged in the direction of the first exciting light (L1). Lens units composing the first lens array are configured to perform imaging with overlap on a surface of the wavelength conversion device (206).