写一个英文小短文介绍 CRT 成像过程

写一个英文小短文介绍 CRT 成像过程
写一个英文小短文介绍 CRT 成像过程

写一个英文小短文介绍 CRT 成像过程
CRT display terminals mainly by the electron gun (Electron gun),deflection coil (Deflection coils),mask (Shadow mask),phosphor layer (phosphor) and glass enclosure of five parts.
Simple to understand,CRT display terminal works is that when CRT cathode electron gun inside the beam emitted by the intensity control,focused and accelerated into a small electronic flow through the deflection coil then the role of target deviation to the right,through the shade cover the hole or fence,on the bombardment of the phosphor screen.Then phosphor is activated to emit light to.R,G,B three-color fluorescent dots in different proportions by the electronic flow of light intensity,will produce a variety of colors.
Electron gun (Electron gun) works by filament heating the cathode,the cathode electron emission,and then accelerated very electric field under the effect of,the focus electrode together into a very fine electron beam,the anode high pressure,access to huge amounts of energy to high speed to bombard the phosphor layer.The electron beam of the goal is to screen the three primary colors.To this end,the electron beam emission electron gun is not a bunch,but the three beams,which were affected by the computer graphics R,G,B three color video signal voltage control,to bombard their phosphor unit.
Excited by the high-speed electron beam,these units were issued for the intensity of different phosphors of red,green,and blue light.Thus produce different colors mixed pixels,a large number of pixels of different colors can be composed of a pretty picture,and constantly changing picture to become a moving image.Obviously,the more pixels,the image more clear,delicate,it is even more realistic.
Deflection coil (Deflection coils) role is to help launch the three electron beam guns to very,very fast scan of all the pixels excited.Can make the electron beam tube to a certain order,periodically bombarded each pixel,so that each pixel light; and as long as this cycle is short enough,that of a pixel in terms of the electron beam bombardment often enough high,we will see a complete image.With the scanning,the screen can be formed.
Shadow Mask (Shadow mask) the role is to ensure three electron beam scanning process,accurately hit each pixel.Shadow mask is a thin metal thickness is about 0.15mm baffle,on it there are many small holes or thin slots,they are the same group of pixels that correspond to the phosphor elements.Three small electron beam through holes or slots can only hit the same post in the corresponding pixel phosphor elements,so can guarantee the purity and the correct color convergence,so we can see a clear image.
Finally,the field scanning rate to determine the screen sense of continuity,field scan faster,the more the formation of a single image,the screen more smoothly.And how many times per second field scanning is typically measured in the standard picture quality,we usually use the frame rate or field frequency (in Hz,Hertz),using the frame rate the larger the image the more sense of continuity.
1,to avoid CRT monitors work in dusty places
As the high pressure inside the CRT monitor (l0kV 30kV) easily attract dust particles in the air,and it will affect the deposition of heat from electronic components to make circuit boards and other components of the temperature rise,resulting in leakage and burn components ,dust may absorb moisture,corrosion and other electronic circuits inside the monitor.Therefore,usually should be used to clean the monitor placed in a clean environment,if possible,should also be made to purchase or display a special dust cover after each use with a dust cover to be cast in a timely manner.
2,to avoid the interference of electromagnetic fields on CRT monitors
CRT monitor long-term exposure may be magnetized in a magnetic field or damaged.Cooling fans,fluorescent lights,lightning,refrigerators,electric fans and other appliances around the larger power consumption,or other such non-shielded speakers or telephone will have a magnetic field generated by the display of these electromagnetic devices to work,a long time to possible color cast,showing confusion and so on.Therefore,usually used when the monitor in a place far away from other fields,on a regular basis (such as a month,etc.) using the buttons on the monitor degaussing degaussing,but do not pay attention once again to use it,it will damage the monitor.
3,to avoid CRT monitors work in a state of high temperature
CRT monitor CRT as a major heat source,high ambient temperature in the work of its performance and service life will be greatly reduced,the other,CRT displays the work of other components in high temperature environment will accelerate the aging process,so To avoid CRT monitors work in a state of high temperature,CRT monitors placed around to leave enough space to let it heat.In the hot summer months,it is best not to use the monitor for a long time,when conditions permit,it is best to place the monitor in air-conditioned room,or fan just blowing.
4,to avoid glare CRT Monitors
We know that CRT monitors are dependent on the electron beam hit the phosphor to display images,therefore,CRT monitors by the sun or bright light,a long time,easy to accelerate the aging of CRT phosphors reduce the luminescence efficiency.Therefore,it is best not to CRT monitors placed in the strong sunlight,place,or where the light must pass through and hang pieces of dark cloth to reduce its light intensity.