Dual Projection Multimedia Player with Polarizing Beam Splitter
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Solution Overview
Problem
Mobile communication terminals face challenges in miniaturization and low power consumption due to the need for larger display screens and inconvenient image focus adjustments when using projection functions, which increase power consumption and hinder portable usage.
Innovation Solution
A multimedia player capable of concurrently displaying two clear projection images using a single light source, polarizing beam splitter, and spatial optical modulation elements, with adjustable light sources and modulation devices to maintain focus without additional settings, allowing for miniaturization and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a projection function is added to a mobile communication terminal, then the display size is increased, but the terminal size and power consumption increase
Solution Approach 1:
The patent combines multiple projection systems into a single integrated optical unit. The first and second projection units share common components including a single light source unit, polarization beam splitter, and optical path integration, allowing two projection functions to be achieved while minimizing the increase in terminal size and power consumption compared to using separate projection systems
Solution Approach 2:
The projection system is designed to serve multiple functions simultaneously - it can project onto two different screens at different distances, provide both input and output display functions, and adapt to various projection scenarios without requiring separate dedicated systems for each function
2Adaptability or versatility
If the distance between the mobile communication terminal and screen changes, then the projection flexibility is improved, but the focus adjustment complexity increases
Solution Approach 1:
The optical system is pre-configured with fixed optical paths and predetermined focal characteristics. The first and second projection lenses are positioned at specific distances from the light modulation devices, and the polarization beam splitter is pre-aligned to correctly direct light paths. This preliminary optical configuration allows the system to maintain focus across different projection distances without requiring complex real-time adjustments
Solution Approach 2:
The patent introduces a polarization beam splitter as an intermediary optical element that mediates between the light source and the two projection paths. This intermediary component enables the system to handle different projection distances and angles automatically by directing light along predetermined optical paths, eliminating the need for manual focus adjustment when changing projection configurations
3Adaptability or versatility
If two projection units are used to display two projection images, then the dual screen functionality is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the optical systems of two projection units by sharing common components. A single light source unit provides illumination for both projection paths, a polarization beam splitter divides and directs light to two different screens, and the optical paths are integrated within a unified housing structure. This merging approach achieves dual screen functionality while minimizing the increase in device complexity compared to using completely separate projection systems
Solution Approach 2:
The optical system is segmented into distinct functional modules - the light source unit, polarization beam splitter, first and second light modulation devices, and first and second projection lenses. Each module performs a specific function and can be independently optimized or replaced, reducing overall system complexity while maintaining dual projection capabilities
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
Enables clear and efficient projection on two screens with minimal power usage and compact design, suitable for mobile terminals by maintaining focus once the optical system is set, enhancing usability and portability.
Implementation Method 1
a single light source, polarizing beam splitter, and spatial optical modulation elements
Data Source
AI summary
A multimedia player for providing two projection images is provided. The multimedia player for displaying two projection images includes: a first projection unit displaying a first projection image; and a second projection unit displaying a second projection image. The first projection unit includes: a first driving unit controlling an operation of the first projection unit and providing an image signal on the first projection image to be displayed; a first light source unit; a first light modulation device outputting the first projection image by modulating light provided from the light source in response to the image signal of the first projection image; and a first projection lens unit magnifying and projecting an image that is output from the first light modulation device. The structure of the first projection unit is the same as that of the second projection unit. The multimedia player further includes a screen sensing unit sensing a color of an area in which an image is to be displayed. The first and second driving units detect a complementary color of a color sensed by the screen sensing unit and increase brightness of a light source corresponding to the complementary color among light sources of the first and second light source units or image data corresponding to the complementary color among image data to be displayed, thereby improving visibility.