Projector Light Source Module With Polarized Beam Overlap
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Solution Overview
Problem
Existing laser projectors face challenges in increasing brightness without enlarging the light source module and maintaining color uniformity due to the limitations of single RGB laser components.
Innovation Solution
The use of dichroic mirrors and polarizing dichroic mirrors, along with half-wave plate structures, to overlap light emitted by groups of light-emitting units of different light components, allowing for compact configuration and improved light uniformity in the light source module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of RGB laser components is increased to increase brightness, then the brightness is improved, but the size of the light source module increases
Solution Approach 1:
The patent combines multiple laser units (red, green, blue) into integrated RGB laser components. Each RGB laser component contains multiple laser units that work together to produce combined light output, reducing the overall number of separate components needed while maintaining or increasing brightness.
Solution Approach 2:
The patent uses optical elements like dichroic mirrors and beam combining optics to overlap light paths from different laser units in a compact spatial arrangement. This allows multiple light sources to be effectively combined in a reduced footprint by utilizing optical dimensionality rather than simple linear arrangement.
2Adaptability or versatility
If multiple laser units are used in a single RGB laser component to emit R, G, and B color light, then the color emission capability is improved, but the overall color uniformity is limited
Solution Approach 1:
The patent positions different laser units (red, green, blue) at specific locations within the RGB laser component and uses optical elements to direct their light to specific regions. This local optimization of light emission and overlap ensures that each color contributes uniformly to the overall output, improving color uniformity while maintaining versatile color emission capability.
3Illumination intensity
If multiple RGB laser light components are configured to increase brightness, then the brightness is improved, but the overall uniformity of light output is reduced
Solution Approach 1:
The patent introduces optical intermediaries such as dichroic mirrors, beam combining optics, and light guiding elements that mediate between multiple laser components and the final output. These intermediaries ensure that light from multiple sources is uniformly combined and distributed, maintaining light output uniformity even as brightness increases through the addition of multiple components.
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 configuration enhances the brightness and color uniformity of the projector by ensuring similar light emission compositions across multiple configuration areas, achieving a more uniform light output.
Implementation Method 1
The first dichroic mirror is disposed corresponding to the first group of light-emitting units, the fourth group of light-emitting units, and the first configuration area. The light emitted by the first group of light-emitting units is reflected by the first dichroic mirror to reach the first configuration area. The light emitted by the fourth group of light-emitting units passes through the first dichroic mirror to reach the first configuration area.
Implementation Method 2
The first polarizing dichroic mirror is disposed corresponding to the second group of light-emitting units, the fourth group of light-emitting units, and the first configuration area. The light emitted by the second group of light-emitting units is reflected by the first polarizing dichroic mirror and passes through the first dichroic mirror to reach the first configuration area.
Implementation Method 3
The first half-wave plate structure is disposed between the second group of light-emitting units and the first polarizing dichroic mirror or between the fourth group of light-emitting units and the first polarizing dichroic mirror. The light emitted by the second group of light-emitting units or the fourth group of light-emitting units passes through the first half-wave plate structure before reaching the first polarizing dichroic mirror.
Data Source
AI summary
A light source module includes a plurality of light components, and appropriately configured dichroic mirrors, polarizing dichroic mirrors and half-wave plate structures. The configuration allows light emitted by the plurality of light components to overlap to provide a light output configuration. For example, each of two light components has two groups of light-emitting units that emit light to two configuration areas of the light output configuration respectively. For another example, light emitted by a first light component and a group of light-emitting units of a second light component is guided to a first configuration area of the light output configuration, and light emitted by a third light component and another group of light-emitting units of the second light component is guided to a second configuration area of the light output configuration. A projector includes a projection lens, a light modulation module, and the above light source module.