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Though these projectors appear almost the same, the internal optical systems are different based on the display device for use, and there are several types of these projectors.
Projectors currently available on the market primarily use one of the following three systems: (except CTR system for fixed pixel) |
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| (1) 3LCD System |
The most widely used system around the world. TFT display is used for light valves.
Incident light from the light source is divided into red, green and blue using a special mirror, and after the picture is created by LCD for each color, it is composed and projected. |
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| (2) DLPTM*1 System |
DMDTM*2 (Digital Micromirror Device) is used as a display device.
DMDTM*2 is a semiconductor with hundreds of thousands of micro-sized mirrors arranged.
Each mirror corresponds to a pixel and projects an image by reflecting the light
from the source. Systems are 1chip, 2chips, and 3chips. |
*1: DLPTM (Digital Light ProcessingTM) is a trademark of Texas Instruments Incorporated.
*2:DMDTM (Digital Micromirror Device) is a trademark of Texas Instruments Incorporated. |
| (3) LCOS System |
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LCOS (Liquid Crystal On Silicon) is used as a display device.
LCOS is a reflective LCD display panel with a feature of high open area ratio.
By creating wiring area and switching elements under the reflection layer, it does not require black matrix area and you can view a seamless image.
Systems are 1chip and 3chips. |
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| TFT display is used for light valves. Incident light from the light source is divided into red, green, and blue using a special mirror called a dichroic mirror,
which transmits the light with a certain wavelength, and after the light controlled by LCDs for each color is composed with a prism, the picture is projected. |
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| DMDTM (Digital Micromirror DeviceTM) has a mechanism in which mirrors are arranged on a semiconductor substrate and their angle changes by turning them on and off.
DLPTM (Digital Light ProcessingTM) is a generic name of an optical system using DMDTM. Full color display is achieved in DLPTM by displaying a picture based on the color at a certain moment by rotating the color wheel thousands of times a second. |
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LCOS (liquid crystal on silicon), reflective liquid crystal element, is used as a display device. High performance 3LCOS projectors and rear projection TVs are achieved by utilizing high resolution element's characteristics.
For 1-Light Valve colors, sequential optical driving system with a rotation prism mechanism, which divides the light into red, green, and blue and projects the picture, is used.
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