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Projection technology is generally divided into CRT, LCD, DLP, LCOS.
CRT projection technology is the earliest realization, the most widely used display technology, the application of CRT technology projector is also known as Cathode Ray Tube projector, it is mainly composed of three CRT cathode ray tube.
As one of the most mature products, CRT projectors have a wide color gamut that is unmatched by several other projectors. However, its large size, low brightness, and extremely cumbersome to adjust, has not kept up with the times. So the development of modern projectors in lightweight and intelligent is the trend, LCD and DLP technology has occupied the mainstream market position.
LCD is the abbreviation of liquid crystal display, so LCD is also known as the liquid crystal display technology.
There are single-chip LCD projectors and three-chip LCD projectors. Single-chip is in a liquid crystal board integrated with red, green, blue three primary colors, and then mixed color on the screen, this single-chip is small and lightweight, easy to carry, and inexpensive. But because its liquid crystal monochrome open aperture rate is low, the mixing principle of spatial mixing, so the sense of grain is more obvious, has basically been eliminated.
The three-chip LCD projectors, also known as 3LCD technology, use red, green and blue three LCD boards as the control layer for the red, green and blue primary colors respectively. The white light emitted from the light source is converged by the lens set and then reaches the beam splitter, and the red, green and blue colors are separated out. The separated three colors are projected onto separate LCD panels, and the corresponding pixels on the LCD panels receive the electronic signal from the source and are rendered with different transparency, generating an image with different transparency for each pixel.
Finally, three monochrome images converge in the prism and are projected by the projector lens onto the projection screen to form a full-color image. 3LCD projectors have bright, natural and soft images and are a widely used projection technology at present.
DLP technology, also known as digital light processing technology, the patent is owned by Texas Instruments (TI), and the cores of DMD chips and DMD controllers are currently provided exclusively by TI. After several years of development, the current DLP technology has an extremely wide range of applications, including large-screen digital TVs, various projectors and digital cameras.
DLP technology is based on reflective DMD, a purely digital display method with high reliability. DLP technology enables images to achieve extremely high fidelity, giving clear, bright and colorful images.
Depending on the number of DMD digital microlenses included in a DLP projector, people also classify projectors into single-chip DLP projectors, two-chip DLP projectors and three-chip DLP projectors (also called 3DLP).
Most of the smart projectors on the market today are monolithic. The single-chip DLP chip projection method is through the rotation of the color wheel with the instant reflection of each small reflector on the DLP chip, using the human eye's visual transient on the corresponding pixels to produce different colors, which is why there is sometimes a rainbow effect produced, the accuracy of the color depends on the quality of the color wheel and the chip processing power.
Two-chip DLP projectors are mostly used in large entertainment venues for large screen display walls and other places.
3DLP projection technology does not require a color wheel, the colors are projected onto the corresponding DLP chips through a beam splitter that decomposes the white light into the three primary colors, red, blue and green, and each DLP is responsible for the distribution of only one color, and then the light is synthesized through a lens and output to the curtain, somewhat similar to 3LCD technology. 3DLP projection technology is generally used on high-end projectors.
LCOS projection technology belongs to the new reflective MICRO LCD projection technology, the basic principle of LCOS projector is similar to LCD projector, but LCOS projector is the use of LCOS panel to modulate the light signal emitted by the light source, and LCD projector the biggest difference is that LCD projector is the use of light source through the LCD for modulation, belongs to the penetrating type, and LCOS projector is the use of reflective architecture, so the light emitted from the light source does not penetrate the LCOS panel, belongs to the reflective type.
LCOS projection technology has the advantages of high light utilization efficiency, small size, and high resolution compared to pass-through LCD and DLP.
1. CRT projection technology
CRT projection technology is the earliest realization, the most widely used display technology, the application of CRT technology projector is also known as Cathode Ray Tube projector, it is mainly composed of three CRT cathode ray tube.
As one of the most mature products, CRT projectors have a wide color gamut that is unmatched by several other projectors. However, its large size, low brightness, and extremely cumbersome to adjust, has not kept up with the times. So the development of modern projectors in lightweight and intelligent is the trend, LCD and DLP technology has occupied the mainstream market position.
2. LCD projection technology
LCD is the abbreviation of liquid crystal display, so LCD is also known as the liquid crystal display technology.
There are single-chip LCD projectors and three-chip LCD projectors. Single-chip is in a liquid crystal board integrated with red, green, blue three primary colors, and then mixed color on the screen, this single-chip is small and lightweight, easy to carry, and inexpensive. But because its liquid crystal monochrome open aperture rate is low, the mixing principle of spatial mixing, so the sense of grain is more obvious, has basically been eliminated.
The three-chip LCD projectors, also known as 3LCD technology, use red, green and blue three LCD boards as the control layer for the red, green and blue primary colors respectively. The white light emitted from the light source is converged by the lens set and then reaches the beam splitter, and the red, green and blue colors are separated out. The separated three colors are projected onto separate LCD panels, and the corresponding pixels on the LCD panels receive the electronic signal from the source and are rendered with different transparency, generating an image with different transparency for each pixel.
Finally, three monochrome images converge in the prism and are projected by the projector lens onto the projection screen to form a full-color image. 3LCD projectors have bright, natural and soft images and are a widely used projection technology at present.
3. DLP projection technology
DLP technology, also known as digital light processing technology, the patent is owned by Texas Instruments (TI), and the cores of DMD chips and DMD controllers are currently provided exclusively by TI. After several years of development, the current DLP technology has an extremely wide range of applications, including large-screen digital TVs, various projectors and digital cameras.
DLP technology is based on reflective DMD, a purely digital display method with high reliability. DLP technology enables images to achieve extremely high fidelity, giving clear, bright and colorful images.
Depending on the number of DMD digital microlenses included in a DLP projector, people also classify projectors into single-chip DLP projectors, two-chip DLP projectors and three-chip DLP projectors (also called 3DLP).
Most of the smart projectors on the market today are monolithic. The single-chip DLP chip projection method is through the rotation of the color wheel with the instant reflection of each small reflector on the DLP chip, using the human eye's visual transient on the corresponding pixels to produce different colors, which is why there is sometimes a rainbow effect produced, the accuracy of the color depends on the quality of the color wheel and the chip processing power.
Two-chip DLP projectors are mostly used in large entertainment venues for large screen display walls and other places.
3DLP projection technology does not require a color wheel, the colors are projected onto the corresponding DLP chips through a beam splitter that decomposes the white light into the three primary colors, red, blue and green, and each DLP is responsible for the distribution of only one color, and then the light is synthesized through a lens and output to the curtain, somewhat similar to 3LCD technology. 3DLP projection technology is generally used on high-end projectors.
4. LCOS projection technology
LCOS projection technology belongs to the new reflective MICRO LCD projection technology, the basic principle of LCOS projector is similar to LCD projector, but LCOS projector is the use of LCOS panel to modulate the light signal emitted by the light source, and LCD projector the biggest difference is that LCD projector is the use of light source through the LCD for modulation, belongs to the penetrating type, and LCOS projector is the use of reflective architecture, so the light emitted from the light source does not penetrate the LCOS panel, belongs to the reflective type.
LCOS projection technology has the advantages of high light utilization efficiency, small size, and high resolution compared to pass-through LCD and DLP.
