Input output devices
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Input and output devices allow humans to interact with computers. Images are 2D representations of 3D objects, and can be bitmap images composed of pixels or vector images defined by mathematical equations. Common output display devices include raster scan displays, random scan displays, and newer flat panel displays like plasma panel displays and liquid crystal displays, which are thinner and lighter than older cathode ray tube displays.
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Input output devices
- 2. IMAGE AND OBJECT Image is a representation of an object on computer. OBJECT :
- 3. Objects are real entities defined in three dimensional (3D) coordinates. Image is a 2D description of a 3D object.
- 4. BITMAP GRAPHICS/IMAGES Bitmap images are pixel based. The term bitmap implies one bit per pixel Eg: digital images
- 5. 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.
- 9. Required to force the electrons to converge into small spots
- 11. RANDOM SCAN
- 12. 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.
- 13. TWO CATEGORIES EMMISSIVE DISPLAY: they convert electrical energy to light. NON-EMMISSIVE DISPLAY: they use optical effects to convert sunlight or light from the surroundings into graphics pattern
- 14. PLASMA PANEL DISPLAY. (EMMISSIVE)
- 16. LIQUID CRYSTAL DISPLAY(LCD) (NON-EMMISSIVE)