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Two Different Types Of Proyectors Essay

892 words - 4 pages

1. Introduction
i. Analysis of Presented Task
The goal of the presented task is to evaluate the differences between two largely different pieces of technology of our choosing, and evaluate their suitability to the task from a physics perspective, with the end goal of evaluating the two different technologies for the suitability in a home theatre
For the purpose of this task, I have chosen two different types of projectors, the DLP Projector (Short for Digital Light Processing) and the LCD Projector (Short for Liquid Crystal Display).

ii. Short Overview of DLP and LCD Projectors
There are two main varieties of projectors widely used, and these are the DLP and LCD projectors respectively. Both devices have the same objective goal, to project an image onto a surface several feet away through the manipulation of light. However, projectors are widely different from televisions as projectors have to ensure that their image travels a far enough distance to the projection surface, while still retaining image clarity and colour.
The DLP projector does this through the usage of digital micro mirror devices. These are small chips, inlaid with incredibly small mirrors laid out in a matrix on a semiconductor chip. Every mirror correlates directly to a pixel within the image, therefore the more mirrors you have, the greater resolution your image.

The LCD projector however, uses a very different schematic. LCD projectors work through sending light by use of a metal halide lamp through several screens or films that separate light into its three components, red, green, and blue. As the image is projected, these individual pixels are turned on and off repeatedly, allowing different colours to be produced.
2. Schematics
i. DLP Projectors
As has already been stated, DLP projectors work through the usage of Digital Micro mirror Devices (DMD), which are small semiconductor chips with hundreds of microscopically small mirrors laid out in a matrix across its surface. The more mirrors in the DMD, the higher resolution your image will be, resulting in higher image quality and clarity. These mirrors can be rapidly re-adjusted as to either reflect their light either through the lens or onto a heat sink
If the mirrors are rapidly toggled between these two settings, grayscales are produced, which are controlled by the ratio of on time to off time.
When it comes to colour in DLP Projection, there are two main methods, one used only in single chip DLP Projectors, and the method used by triple chip projectors. For the point of the analysis, we’ll use a single chip DLP projector. In projectors that only use a single DMD, all colours in the image are produced by a rotating colour wheel placed...

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