LCD Projector Active Color Separation Lighting
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Solution Overview
Problem
Traditional liquid crystal display (LCD) projectors suffer from low optical efficiency, high energy consumption, and poor heat dissipation due to the absorption of light by color filters, black matrices, and thin film transistors, limiting their brightness and application in high pixel density requirements.
Innovation Solution
An LCD projector with active color separation lighting, comprising a three-base color LED light source, dichroic mirror, collimating lens, and color combination mirror, which irradiates RGB rays directly onto corresponding sub-pixels, reducing light blocking and increasing transmittance, and utilizing a grating to enhance wavelength separation and reduce heat absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional color filters, black matrices, and thin film transistors are used in LCD light valve, then the projector structure is simple and easy to manufacture, but the total transmittance is only 4%-7% and optical efficiency is no more than 3.5%
Solution Approach 1:
The patent removes the color filter layer from the LCD light valve structure. Instead of using traditional color filters that block 70-80% of light, the invention uses a white light source with an LCD light valve that has no color filter, allowing much higher light transmittance. The color separation is achieved through the LCD light valve's pixel structure itself, extracting the color filtering function from a separate layer and eliminating its harmful light blocking effect.
Solution Approach 2:
The patent changes the key parameter of light transmittance by eliminating the color filter layer. This structural parameter change transforms the total transmittance from 4%-7% to potentially much higher values, directly improving optical efficiency from 3.5% to potentially 20% or more by changing the physical structure rather than optimizing existing components.
2Device complexity
If traditional LCD light valve with color filters is used, then the device complexity is low, but the heat dissipation is extremely difficult and brightness output is limited
Solution Approach 1:
The patent extracts and removes the color filter layer that is the primary source of heat generation. By eliminating this layer that absorbs 70-80% of incident light and converts it to heat, the system dramatically reduces heat generation at the light valve. This allows the projector to maintain lower operating temperatures and achieve higher brightness outputs without thermal limitations.
3Loss of energy
If three planar beam splitters are used for active color separation, then the transmission efficiency of LCD light valve is improved, but the total efficiency of five light transmission surfaces is ≤78% and optical extension is increased
Solution Approach 1:
The patent extracts and eliminates the need for separate beam splitters by integrating the color separation function directly into the LCD light valve's pixel structure. The LCD light valve inherently separates colors through its RGB sub-pixel arrangement, removing the need for additional beam splitting components and their associated light loss and complexity.
Solution Approach 2:
The patent merges the color separation function with the LCD light valve itself. Instead of having separate beam splitters and then the light valve, the invention combines these functions so the LCD light valve directly receives white light and modulates it according to its pixel structure, eliminating intermediate optical components and reducing overall system complexity.
4Ease of manufacture
If color filters with low aperture ratio are used, then the PPI can be kept low (≤120), but the basic requirements of 300-900 PPI cannot be met
Solution Approach 1:
The patent extracts the color filtering function from a separate layer with aperture limitations and eliminates it. Without the color filter layer's aperture restrictions, the LCD light valve can achieve much higher PPI (300-900 or more) because the limiting factor of filter aperture no longer constrains the pixel density that can be practically implemented.
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 design significantly improves the optical efficiency of the LCD projector, increasing transmittance and reducing energy consumption, allowing for higher brightness and expanded color gamut, while enhancing heat dissipation and achieving higher luminous flux output.
Implementation Method 1
dichroic mirror, which irradiates RGB rays directly onto corresponding sub-pixels
Implementation Method 2
utilizing a grating to enhance wavelength separation
Implementation Method 3
collimating lens
Data Source
AI summary
A liquid crystal display (LCD) projector with active color separation lighting includes a projection light source, a condenser, a collimating lens, an incident polarizer, a dichroic mirror, an LCD light valve, a color combination mirror, an outgoing polarizer, a field lens and a projection lens all of which are distributed in sequence according to a direction of light travel. In the present invention, RGB three primary color rays of the projection light source are irradiated on the RR, GR and BR of the LCD light valve, respectively, ≥⅔ of the light originally blocked by the CF and the light originally blocked by the BM pass as much as possible or even completely through R, G and B sub-pixels, which fundamentally improves the transmittance of the LCD light valve, so that the efficiency of the optical system is completely improved.