input output devices
TRANSCRIPT
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INPUT- OUTPUT DEVICES
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IMAGE AND OBJECT
Image is a representation of an object on computer.
OBJECT :
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Objects are real entities defined in three dimensional (3D) coordinates.
Image is a 2D description of a 3D object.
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BITMAP GRAPHICS/IMAGES
Bitmap images are pixel based. The term bitmap implies one bit per pixel
Eg: digital images
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VECTOR GRAPHICS/IMAGES
Vector images are built using some mathematical equations.
If any changes are to be done then those changes are done in the equations.
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OUTPUT DEVICES
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Required to force the
electrons to converge into small spots
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RASTER SCAN DISPLAY
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RANDOM SCAN
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FLAT PANEL DISPLAY:
Cathode ray tubes are replaced by flat panel display devices because this device have reduced size and weight.
A significant feature is that they are thinner than CRTs and we can hang them on walls or wear them on wrists.
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TWO CATEGORIES
1. EMMISSIVE DISPLAY: they convert electrical energy to light.
2. NON-EMMISSIVE DISPLAY: they use optical effects to convert sunlight or light from the surroundings into graphics pattern
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PLASMA PANEL DISPLAY.(EMMISSIVE)
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LIQUID CRYSTAL DISPLAY(LCD)(NON-EMMISSIVE)
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