Projection Type Display Fluorescent Substance Positioning for Bright Contrast
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Solution Overview
Problem
Existing projection type display devices face the challenge of image darkening when adjusting contrast using light quantity adjustment mechanisms, which reduces the brightness of the projected image.
Innovation Solution
Incorporating a moving mechanism to adjust the distance between the fluorescent substance and the condenser lens, in conjunction with light quantity adjustment mechanisms, to maintain image brightness while enhancing contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light quantity is reduced by means of the light quantity adjustment mechanism to increase the contrast, then the contrast of the projected image is improved, but the projected image is darkened
Solution Approach 1:
The patent changes the physical parameter of the fluorescent substance position (distance from condenser lens) to compensate for light quantity reduction. By moving the fluorescent substance closer to the condenser lens when the aperture is reduced, the system maintains illumination intensity while preserving the contrast improvement from the aperture adjustment.
Solution Approach 2:
The patent introduces a moving mechanism that dynamically adjusts the position of the fluorescent substance based on the aperture size. This dynamic adjustment ensures that as the aperture changes to control contrast, the fluorescent substance position is simultaneously optimized to maintain brightness, resolving the static trade-off between contrast and brightness.
2Measurement precision
If the aperture size is reduced to adjust light quantity for contrast improvement, then the contrast increases, but the overall light quantity and image brightness decrease
Solution Approach 1:
The patent compensates for the reduction in light quantity caused by aperture reduction by changing the position parameter of the fluorescent substance. Moving the fluorescent substance closer to the condenser lens increases the solid angle of light collection, thereby compensating for the reduced aperture area and maintaining overall light quantity.
3Device complexity
If the distance between the fluorescent substance and the condenser lens is fixed, then the device structure is simple, but the ability to maintain brightness during contrast adjustment is lost
Solution Approach 1:
The patent transforms the fixed distance structure into a dynamic adjustable structure. The moving mechanism allows the fluorescent substance position to vary with aperture size, enabling brightness maintenance during contrast adjustment while adding only minimal structural 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 maintains image brightness while improving contrast by optimizing the distance between the fluorescent substance and condenser lens in response to light quantity adjustments.
Implementation Method 1
a fluorescent substance that is irradiated with laser light and is configured to emit illumination light of a prescribed color
Implementation Method 2
a condenser lens that is positioned at a location immediately after the fluorescent substance on a side in which the illumination light is emitted from the fluorescent substance, and is configured to collect the illumination light
Data Source
AI summary
A fluorescent substance is irradiated with laser light and emits illumination light of a prescribed color. A condenser lens collects the illumination light. A moving mechanism moves the fluorescent substance in a direction toward the condenser lens and in a direction away from the condenser lens. An image display element generates image light by modulating the illumination light according to an image. A light quantity adjustment mechanism adjusts the quantity of the image light by changing the size of an opening through which the illumination light or the image light passes in order to adjust the contrast of a projected image. A controller controls the moving mechanism such that the distance between the fluorescent substance and the condenser lens is a distance in association with an F-number corresponding to the adjustment state of the quantity of the image light implemented by means of the light quantity adjustment mechanism.