Projection Display Light Beam Aspect Ratio Control
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Solution Overview
Problem
Conventional projection displays that combine light beams from two sources often result in a composite light beam with an aspect ratio of 2:1, leading to inefficient light utilization and the need for large, costly optical systems, as well as high heat-resistant materials that compromise reliability.
Innovation Solution
A projection display that uses a reflection/transmission member with a reflective surface and light-shielding surface, featuring openings that transmit and reflect light beams from two sources in a manner that aligns their aspect ratios to match that of a single light source, achieving a 1:1 aspect ratio for improved light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light beams from two light sources are combined using conventional methods (prism array plates or deflection members), then the composite light beam can be formed, but the aspect ratio becomes 2:1 which degrades light utilization efficiency
Solution Approach 1:
The invention divides the composite light beam formation into two separate optical paths: one for the first light source and another for the second light source. Each optical path independently forms a light beam with optimal aspect ratio, and these segmented beams are then combined without distorting the overall aspect ratio, thereby maintaining high light utilization efficiency
Solution Approach 2:
The invention changes the spatial arrangement dimension by positioning the two light sources and their respective optical components in separate dimensional planes. This allows each light beam to maintain its optimal aspect ratio while being combined, avoiding the 2:1 aspect ratio problem that occurs when light beams are combined in the same plane using conventional methods
2Productivity
If the aspect ratio of the composite light beam is 2:1, then light beams from two sources can be combined, but larger optical components are required which increases system cost
Solution Approach 1:
The optical system is segmented into two independent subsystems, each handling one light source. This segmentation allows each subsystem to use optimally-sized optical components rather than requiring oversized components to accommodate the distorted 2:1 aspect ratio of combined beams, thereby reducing manufacturing costs
Solution Approach 2:
Instead of combining light beams first and then adjusting the aspect ratio (which requires large optical components), the invention inverts the approach by maintaining optimal aspect ratios in each individual beam path and only combining them at the final stage, thereby avoiding the need for large, costly optical components
3Shape
If light beams are combined at a focal point using deflection members, then the aspect ratio can be adjusted, but high heat-resistant materials are required which compromise reliability and increase costs
Solution Approach 1:
The invention extracts the focal point combination method and replaces it with a non-focal point combination approach. By taking out the deflection member from the focal point and using separate optical paths that converge without focal point concentration, the system eliminates the need for high heat-resistant materials, thereby improving reliability and reducing costs
Solution Approach 2:
The invention introduces an intermediary optical path that allows light beams to be combined without direct focal point contact. This intermediary approach uses optical elements that guide beams separately and combine them in a manner that distributes heat rather than concentrating it, eliminating the need for heat-resistant materials and improving system reliability
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 utilization efficiency, reduces the need for large optical components, and eliminates the requirement for high heat-resistant materials, resulting in a more reliable and cost-effective projection system.
Implementation Method 1
The first light beam is transmitted through the plurality of openings from the light-shielding surface to the reflective surface
Implementation Method 2
The second light beam is reflected off the reflective surface in a direction that the first light beam is transmitted
Implementation Method 3
a light valve converting a light beam from the reflection/transmission member into an optical image in accordance with a video signal
Data Source
AI summary
A projection display includes first and second light sources, a reflection/transmission member which partially transmits a first light beam from the first light source and partially reflects a second light beam from the second light source, and a light valve which converts the light beam from the reflection/transmission member into an optical image in accordance with a video signal. The reflection/transmission member has a reflective surface which is one side main surface, a light-shielding surface which is the other side main surface, and a plurality of openings extending through the both main surfaces. The first light beam is transmitted through the openings from the light-shielding surface to the reflective surface, and the second light beam is reflected off the reflective surface in the direction that the first light beam is transmitted.