Difference between Digital Light Processing (DLP) and Liquid Crystal Display (LCD) Projector

1. Digital Light Processing (DLP) Projector:
Digital Light Processing (DLP) is a reflective projection method that combines a microelectrochemical system (MEMS) and projection display by the help of Digital Micrometer Device (DMD) microchip. The peculiar microchip is made by MEMS array of semiconductor-based digital light switches that accurately and efficiently controls the source of light.

  • Formation of Image:
    This projector is made by digital light switches used in DMD chip, those are small in size (approx. 16×16 ?m) mirrors. Here every mirror is hinged and flips between the two angles. The first angle is used to reflect the light to the projection aperture which is producing in a bright pixel. And the other angle is used to reflect the light far away from the projection aperture which generates a dark pixel on the screen. The grey scale can be seen by flipping the mirror at a fast speed between the two angles around thousands of times in just a second.

2. Liquid Crystal Display (LCD) Projector:
These projectors are designed using the very small liquid-crystal panels where instead of reflection the trans of light takes place. It is using the three panels for every color. However, a fourth panel is used for improving the generation of color. The primary work of the optical filters is to divide the white light from the lamp into three colors (red, green and blue) and send them through their specified panel.

  • Formation of Image:
    These projector design an image by sending changing electrical signals to every pixel in swift succession. This can give two outcomes, in first, the light is transferred through the LCD panel along with generating a bright pixel on the screen. In the second outcome, the light can be absorbed through the panel showing a dark pixel on the screen.

Difference between DLP Projector and LCD Projector:

S.No. Comparison DLP Projector LCD Projector
1. Basic Implements reflective technology. Employs transmissive technology.
2. Pixel visibility Low High
3. Colour production Immaculate colours that are acceptable for their brightness. Adequate colours and accuracy settings available.
4. Misconvergence Not visible. Present.
5. Output Projects the object over the screen by reflecting the light. Transmits the light in order to produce the object on the screen.
6. Pixel Gap Creates small gaps between the pixels compared to LCD. Creates large gaps between the pixels compared to DLP.



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