Semi-Vertical LCD Projector Optical System with Curved Reflectors
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Solution Overview
Problem
Existing single LCD projectors face challenges in achieving a balance between small size, high integration, low cost, and innovative appearance, with traditional optical systems limiting design freedom and performance due to the use of plane reflectors that cannot change optical parameters beyond light axis direction.
Innovation Solution
The optical system incorporates a semi-vertical configuration with a projection light source, condenser, illuminating reflector, collimating lens, LCD light valve, field lens, and imaging reflector, where the illuminating and imaging reflectors are designed with curved surfaces to provide optical compression and expansion functions, increasing design freedom and performance without increasing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If plane reflectors are used to turn the light path direction, then the projector structure is simplified, but the optical parameters cannot be changed and design freedom is limited
Solution Approach 1:
The patent applies curved reflectors instead of plane reflectors to enable both light path direction control and optical parameter adjustment. The curved surfaces provide compression and expansion functions that allow modification of optical parameters while maintaining structural simplicity
Solution Approach 2:
The curved reflectors serve multiple functions simultaneously: they turn the light path direction like plane reflectors, but also provide optical compression and expansion capabilities, effectively combining multiple optical functions into a single component
2Device complexity
If direct projection type optical system is used, then the optical path is simple, but the projector volume is large and appearance coordination is poor
Solution Approach 1:
The curved reflectors enable compact folding of the optical path, allowing the projector to achieve a smaller volume while maintaining effective optical performance. The curvature allows light to be redirected through a more compact spatial arrangement
3Reliability
If curved surface reflectors with compression convergence or expansion divergence function are used, then the design freedom and optical performance indicators are improved, but the device complexity increases
Solution Approach 1:
The patent employs curved reflector surfaces that provide compression and expansion functions to improve optical performance. The curved geometry enables better control over light paths and optical parameters while maintaining manufacturing feasibility
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 results in a smaller, more integrated projector with improved heat dissipation and sound box efficiency, enhanced illumination efficiency, and better image contrast, achieving a novel appearance and higher optical performance.
Implementation Method 1
condenser, an illuminating reflector, a collimating lens, an LCD light valve
Implementation Method 2
the illuminating reflector reflects and turns light irradiating the LCD light valve in up and down directions
Implementation Method 3
a collimating lens, an LCD light valve
Implementation Method 4
the imaging reflector performs mirror reflection and turning on light emitted by the LCD light valve in left and right directions
Implementation Method 5
a field lens, an imaging reflector and a projection lens
Data Source
AI summary
An optical system of a semi-vertical single LCD (liquid crystal display) projector includes a projection light source, a condenser, an illuminating reflector, a collimating lens, a heat reflecting glass, an LCD light valve, a field lens, an imaging reflector and a projection lens, all of which are set in sequence according to a direction of light, wherein the illuminating reflector reflects and turns light irradiating the LCD light valve in up and down directions, and the imaging reflector performs mirror reflection and turning on light emitted by the LCD light valve in left and right directions. The present invention obtains a new optical system structure, creates a novel stacking and a novel projector appearance, and has low cost, small size and complete integration.