Two-Piece LCD Projector Optical System Blue Beam Management
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Solution Overview
Problem
Conventional two-piece LCD projectors face limitations in output brightness due to higher losses and photochemical/electrochemical damages from excessive blue light, which reduces the projector's durability and efficiency.
Innovation Solution
A two-piece LCD projector optical system with an independent blue beam channel and reduced masking losses, utilizing a light valve electric driver to decode and separate blue, red, and green field images, and combining red and green beams to minimize blue beam quantity and exposure to optical materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the blue beam quantity is increased to improve output brightness, then the projector brightness is improved, but photochemical and electrochemical damages to optical materials increase significantly
Solution Approach 1:
The patent divides the blue beam transmission path into two separate channels: one through the LCD light valve with blue sub-pixels and another through the black and white LCD light valve. This segmentation allows optimization of each channel's transmission efficiency independently, reducing the total blue beam quantity needed while maintaining brightness.
Solution Approach 2:
The patent combines the blue beam transmission through both the color LCD light valve and the black and white LCD light valve, utilizing their respective advantages. The black and white LCD light valve has higher transmission efficiency for blue light, compensating for the losses in the color LCD light valve's blue sub-pixels.
2Stability of the object's composition
If the LCD light valve with red and blue sub-pixels is used to transmit blue beam, then the white balance is maintained, but masking loss from black matrix and sub-pixels reduces transmission efficiency to about 31.3%
Solution Approach 1:
The patent introduces a black and white LCD light valve as an intermediary component specifically for blue beam transmission. This intermediary has higher transmission efficiency (74.5% vs 31.3%) and compensates for the losses in the color LCD light valve, while the color LCD light valve maintains white balance through its blue sub-pixels.
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
Significantly reduces blue beam losses and damages, increasing projector brightness and lifespan while maintaining white balance, thus enhancing user satisfaction and product competitiveness.
Implementation Method 1
the red sub-pixel R' is for resisting the blue beam in the illuminating beam and transmitting the red beam, while the blue sub-pixel B' is for resisting the red beam in the illuminating beam and transmitting the blue beam
Implementation Method 2
the beams are combined through the beam combiner 3' and projected through the projection lens 6'
Data Source
AI summary
A two-piece LCD (Liquid Crystal Display) projector optical system includes a LCD light valve with red and green sub-pixels, a black and white LCD light valve, an illumination device with a red-green combined beam, an illumination device with a blue beam, a beam combiner, a projection lens and a light valve electric driver. The emitted red-green combined beam passes through the LCD light valve and then is transmitted to the beam combiner; the emitted blue beam passes through the black and white LCD light valve and then is transmitted to the beam combiner; the beam combiner combines the beams from the LCD light valve and the black and white LCD light valve, and then the combined beam is transmitted to the projection lens. The optical system lengthens a service life of the projector, improves an output brightness of the projector, and increases satisfaction of users.