Projector Light Guiding Member with Inclining Section
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Solution Overview
Problem
Existing three-plate projectors suffer from a decrease in light use efficiency due to the space between the liquid crystal panels and the light guiding rods, leading to leakage of illumination light.
Innovation Solution
The projector design includes a light guiding member with a light incident surface, a light exiting surface, and an inclining section that increases in cross-sectional area as it extends, ensuring efficient light guidance and minimizing light leakage by either contact or a controlled air layer of 3 μm or less between the light exiting surface and the liquid crystal panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a space is provided between the light guiding rod and the liquid crystal panel for cooling, then the liquid crystal panel can be cooled effectively, but light leakage occurs and light use efficiency decreases
Solution Approach 1:
A dustproof glass plate is introduced as an intermediary component between the light guiding member and the liquid crystal panel. This glass plate serves multiple functions: it prevents light leakage while allowing cooling air to pass through, thus resolving the contradiction between light containment and heat dissipation.
Solution Approach 2:
The space between the light guiding rod and liquid crystal panel is segmented into multiple regions by introducing the dustproof glass plate. This segmentation allows different zones to serve different functions - one zone for light guidance and another for cooling airflow, thereby preventing light leakage while maintaining effective cooling.
2Temperature
If a space is provided between the light guiding rod and the liquid crystal panel, then cooling is enabled, but the illumination margin increases
Solution Approach 1:
The dustproof glass plate acts as a mediator that allows cooling airflow to pass through while maintaining a compact illumination margin. The glass plate's positioning and design enable effective cooling without requiring excessive space that would increase the illumination margin.
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 light use efficiency by reducing light leakage and maintaining a smaller illumination margin, allowing the projector to utilize the blue, green, and red lights more efficiently.
Implementation Method 1
a first inclining section inclining with respect to a first optical axis of the first light guiding member, a cross-sectional area of the first inclining section increasing as the first light guiding member extending in a direction in which the first light is guided
Data Source
AI summary
A projector includes a first light source configured to output linearly polarized first light; a first light collector configured to collect the first light output from the first light source; a first light guiding member configured to guide the first light output from the first light collector; and a first liquid crystal panel configured to modulate the first light output from the first light guiding member. The first light guiding member has a first light incident surface on which the first light output from the first light collector is incident, a first light exiting surface via which the first light exits toward the first liquid crystal panel, and a first inclining section inclining with respect to a first optical axis of the first light guiding member, a cross-sectional area of the first inclining section increasing as the first light guiding member extending in a direction in which the first light is guided. The first light exiting surface of the first light guiding member and a light-incident-side portion of the first liquid crystal panel are in contact with each other, or an air layer having a dimension of 3 μm or smaller is provided between the first light exiting surface and the light-incident-side portion of the first liquid crystal panel.