ITEC610_Question_1

ITEC610_Question_1 - Question 1. Describe the principles...

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Question 1. Describe the principles and operation of the following modern display technologies in a way that makes their advantages and disadvantages clear. a. Plasma display b. Liquid crystal display (LCD) c. Digital light processing (DLP) using the digital micromirror device (DMD), d. Organic light emitting diode (OLED) The basic idea behind the operation of a plasma display is fairly straightforward: a sub-pixel is a microscopic fluorescent lamp that emits one primary color – red, green, or blue. The intensity of the lights from these three sub-pixels is varied displaying a multitude of tints. The principle behind a plasma display is the same on that makes the fluorescent tubes. The tube is sealed with a gas (such as argon) sealed inside. The typical neutral gas is excited by applying high voltage to each end transforming the gas into plasma. The plasma must be kept in continual movement in order for it to emit light so this calls for an alternating current applied to the terminals. Thus, allowing the gas ions to move from one terminal to the other. Since the light emitted is UV, the walls of the tube are coated with a UV-sensitive powder that emits the correct color of light. This powder is a scintillator: a material that converts one form of radiation to another. Plasma technology advantages are the choice of scintillators for plasma displays allows richer colors in a wider range. Since the light is generated in the pixels themselves, the viewing angles are very wide. Plasma displays have excellent contrast and brightness. The contrast comes from the high quality of blacks: a pixel is switched off and emits not light at all. These displays can also achieve values of 900 to 1000 nits The size of the pixels of a plasma display is difficult to reduce to less than 0.5 or 0.6 mm. To be competitive with a resolution the plasma displays had to be 32 to 50 inches. There are still some issues with image quality. In order to emit light a pixel is either lit or not lit and there is not intermediate state. The use of a process called Pulse Code Modulation (PCM) is used to control the brightness. PCM works well for bright and medium colors but the darker colors suffer from reduced quantification, making it difficult to distinguish between two dark shades. Eye fatigue can is also a problem with plasma displays.
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This note was uploaded on 02/15/2012 for the course MBA 101 taught by Professor X during the Spring '11 term at Shawnee.

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ITEC610_Question_1 - Question 1. Describe the principles...

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