Table of Contents
Is DVST better than CRT?
CRT is widely used to display animations, realistic scenes and graphics etc. DVST is only used for the line drawing applications.
What is the DVST in computer graphics?
(Direct View Storage Tube) An early graphics screen that maintained an image without refreshing.
What are the merits of DVST?
- It has a flat screen.
- Refreshing of screen is not required.
- Selective or part erasing of screen is not possible.
- It has poor contrast.
- Performance is inferior to the refresh.
What is the function of writing gun in DVST?
Two electron guns are used in a DVST. One, the primary gun, is used to store the picture pattern; the second, the flood gun, maintains the picture display . DVST terminals also use the random scan approach to generate the image on the CRT screen.
What is shadow mask method?
Shadow Mask Method : Shadow Mask Method is the method which is used in raster scan system which includes color TVs. In this the pixel is made up of three -colors. So due to three colors it uses three electron guns one for producing each color. The colors are red, green and blue.
What is a pixel mask?
A pixel mask is a 2D image whose pixel values are used to filter a dataset (both images and tables). Masks can be used as an alternative to classic regions shapes (circle, box, polygon, etc) or can be used in conjunction with them to create complex filters.
What display does plasma panel provide?
A plasma display panel (PDP) is a type of flat panel display that uses small cells containing plasma: ionized gas that responds to electric fields. Plasma TVs were the first large (over 32 inches diagonal) flat panel displays to be released to the public.
Which is an example of non emissive display?
Non-Emissive Display: The Non-Emissive displays use optical effects to convert sunlight or light from some other source into graphics patterns. Examples are LCD (Liquid Crystal Device). Plasma-Panels are also called as Gas-Discharge Display. It consists of an array of small lights.
What is persistence computer graphics?
The primary output device in a graphics system are video monitor. Persistence is defined as the time it takes the emitted light from the screen to decay to one- tenth of its original intensity. Lower-persistence phosphors require higher refresh rates to maintain a picture on the screen without flicker.
What do you mean by emissive and non emissive displays in computer graphics?
Answer: Emissive display is device that convert electrical energy into light. like ELD,LED etc. Non Emissive is a device that convert sunlight energy into light.
In which method of CRT convergence problems occur?
|Q.||In which method of CRT, convergence problem occur|
|B.||shadow mask method|
|C.||both a & b|
|D.||none of these|
|Answer» b. shadow mask method|
Is there any refresh buffer in DVST?
Direct View Storage Tube (DVST) resembles CRT as it uses electron gun to draw picture and phosphor coated screen to display it. The phosphor used in this is of high persistence. DVST does not use refresh buffer or frame buffer to store picture definition.
What is direct view storage tube (DVST)?
Direct View Storage Tube (DVST) resembles CRT as it uses electron gun to draw picture and phosphor coated screen to display it. The phosphor used in this is of high persistence. DVST does not use refresh buffer or frame buffer to store picture definition. Picture definition is stored in inside CRT in form positive charged distribution.
How to refresh picture in DVST?
In DVST no refreshing is required as result picture drawn on DVST will be seen for several minutes before fading. Two electron guns are used in DVST : Primary Gun and Flood Gun. Primary gun is used to store picture pattern. Flood gun is used to maintain picture display on phosphor coated screen.
What does DVST stand for?
Conceptually the Direct View Storage Tube (DVST) behaves like a CRT with highly persistent phosphor. Pictures drawn on there will be seen for several minutes (40-50 minutes) before fading.
What are the advantages and disadvantages of direct view storage tube?
Figure – Direct View Storage Tube . Advantages of DVST : For picture display it does not require refreshing. Display complex pictures at high resolution without any flicker. No use of frame buffer or refresh buffer. Disadvantages of DVST : Not used for dynamic graphic such as animation. These systems do not display colors.