Projector Light Source Apparatus Illuminance Uniformity
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Solution Overview
Problem
Projectors with multiple laser light sources experience nonuniform illuminance distribution due to the elongated cross-sectional shape of light fluxes, leading to brightness and color unevenness in projected images.
Innovation Solution
A projector design featuring a light source apparatus with sequentially arranged light emitters and optical sections that shift light beams in intersecting directions, adjusting the cross-sectional shape of the light flux to match the aspect ratio of other color light fluxes, ensuring uniform illuminance distribution across the light modulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple light emitters are arranged in a row to form a light flux, then the light source apparatus can be compact and cost-effective, but the light flux develops an elongated cross-sectional shape causing nonuniform illuminance distribution
Solution Approach 1:
The patent introduces optical sections that shift light beams in a direction intersecting both the light exiting direction and the emitter arrangement direction. This adds a dimensional transformation to the light flux geometry, changing the elongated cross-sectional shape into a more uniform distribution by repositioning individual light beams spatially before they combine into the final illumination flux.
Solution Approach 2:
The optical sections act as intermediary components between the light emitters and the light modulator. These sections include optical elements that shift the light beams from the second and third emitters in intersecting directions, serving as a mediating structure that transforms the nonuniform light flux into a uniform distribution without requiring changes to the emitter arrangement itself.
2Device complexity
If light beams from multiple emitters are arranged in a row, then the device structure is simplified, but brightness unevenness and color unevenness occur in the projected image
Solution Approach 1:
The optical sections transform the one-dimensional row arrangement of light beams into a repositioned configuration by shifting beams in intersecting directions. This dimensional transformation allows the light flux to achieve uniform illuminance distribution across the light modulator, eliminating brightness and color unevenness while keeping the emitter arrangement simple.
3Illumination intensity
If the light flux cross-sectional shape is adjusted to match the aspect ratio of other color light fluxes, then uniform illuminance distribution is achieved, but additional optical sections are required
Solution Approach 1:
The optical sections apply localized beam shifting to specific light beams from the second and third emitters, rather than uniformly treating all light flux. By selectively repositioning individual beams in intersecting directions, the system achieves uniform illuminance distribution tailored to the specific geometric requirements of each light flux component.
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 achieves improved image quality with reduced color and brightness unevenness, allowing for precise and cost-effective adjustment of the light flux cross-sectional shape, suitable for small, low-cost projectors with enhanced image quality.
Implementation Method 1
the first optical element may have a first reflection surface that reflects the light beam outputted from the second light emitter in the second direction
Implementation Method 2
the second optical element may have a third reflection surface that reflects the light beam reflected off the second reflection surface in the first direction
Implementation Method 3
the third optical element may have a fifth reflection surface that reflects the light beam outputted from the third light emitter in the second direction
Implementation Method 4
the fourth optical element may have a seventh reflection surface that reflects the light beam reflected off the sixth reflection surface in the first direction
Data Source
AI summary
A projector according to the present disclosure includes a light source apparatus including a light source section including first, second, third, and fourth light emitters sequentially arranged in a row along a first direction that intersects a light exiting direction, a first optical section that shifts light outputted from the second light emitter in a second direction and shifts the light outputted from the second light emitter to a position adjacent to light outputted from the third light emitter, and a second optical section that shifts the light outputted from the third light emitter in the second direction and shifts the light outputted from the third light emitter to a position adjacent to the light outputted from the second light emitter; a light modulator that modulates light outputted from the light source apparatus; and a projection optical apparatus.