Projector Lens Area Balancing for Uniform RGB Brightness
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Solution Overview
Problem
Existing single plate type projectors do not adequately consider light amount differences among red, green, and blue color image lights, leading to perceived brightness discrepancies, particularly with green light being perceived as the strongest and brightest, affecting image and video visibility.
Innovation Solution
A projector design that includes a light source emitting white light, a lens array with specific lenses for each color filter, and pixel electrodes to modulate and project blue, green, and red image lights, with the second lens area larger than the first and third lenses to enhance brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If uniform lenses are used for all color filters, then the device structure is simple, but the perceived brightness of green light is too strong compared to red and blue light
Solution Approach 1:
The patent applies local quality by making the second lens (corresponding to green filter) have a larger area than the first and third lenses (corresponding to blue and red filters). This non-uniform lens configuration compensates for the human eye's higher sensitivity to green light, thereby balancing the perceived brightness across all color channels while maintaining overall system simplicity.
2Illumination intensity
If the green filter area is increased to match human brightness perception, then perceived brightness is improved, but the light amount imbalance among colors worsens
Solution Approach 1:
The patent applies parameter changes by adjusting the area parameter of the second lens to be larger than that of the first and third lenses. This parameter modification compensates for the human eye's spectral sensitivity characteristics, ensuring that green light (to which the eye is most sensitive) receives sufficient optical energy to achieve balanced perceived brightness across all color channels.
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 design improves the perceived brightness of projected images by uniformly modulating and projecting blue, green, and red lights, enhancing overall image and video visibility.
Implementation Method 1
a blue filter configured to transmit the blue light
Implementation Method 2
a green filter configured to transmit the green light
Implementation Method 3
a red filter configured to transmit the red light
Implementation Method 4
a blue sub-pixel electrode configured to modulate the blue light transmitted through the blue filter according to image information and emit blue image light
Implementation Method 5
a lens array disposed on an optical path of the white light emitted from the light source device and including a plurality of lenses
Data Source
AI summary
A projector according to an aspect includes a light source device configured to emit white light including blue light, green light, and red light, a lens array including a plurality of lenses, a color filter including a blue filter configured to transmit the blue light, a green filter configured to transmit the green light, and a red filter configured to transmit the red light, a pixel electrode including a blue sub-pixel electrode configured to modulate the blue light transmitted through the blue filter according to image information and emit blue image light, a green sub-pixel electrode configured to modulate the green light transmitted through the green filter according to the image information and emit green image light, and a red sub-pixel electrode configured to modulate the red light transmitted through the red filter according to the image information and emit red image light, and a projection optical system configured to project the blue, green, and red image lights. The area of the second lens is larger than the area of the green filter and is larger than the area of the first lens and the area of the third lens.