Why do you still have a tube television?
To use with the old school gaming consoles with light guns.
How are OLED TVs able to produce more contrast than CRT TVs?
I hate to disagree with another response, but a CRT really doesn't provide terrific contrast - and yes, an OLED can do considerably better.Both are emissive displays, meaning that unlike an LCD (which is just a light valve), they produce their own light instead of relying on a constantly-on backlight (which will always see SOME leakage through an LCD panel, thus increasing the black level and reducing the contrast). There are two problems with CRTs, though, that tend to limit the delivered contrast.First is the fact that the cutoff point of the electron gun drifts and cannot be maintained precisely at the "black level" of the incoming video signal. It really shouldn't be set exactly at the black level anyway, because as you get close to the CRT cutoff point its behavior is becoming very nonlinear, which would distort the bottommost gray levels. So a proper CRT setup places the black level just out of cutoff, meaning that the beam won't quite be extinguished when the video level is at black. (Unfortunately, the cutoff point will continue to drift as the CRT ages, which means that you can't maintain this adjustment for very long; I've seen some professional users who insisted on readjustment weekly if not daily. This is another reason for not setting the black right at cutoff, as it will very soon be below cutoff and take the bottommost grays with it.)Second, while there are some contrast-enhancing tricks that can be played with the CRT - such as a "black matrix" surround around all of the phosphor dots on the screen - the phosphor screen is pretty reflective, being backed by a nice shiny metal layer. So with any ambient lighting at all, the true limit on the contrast ratio that can be delivered is actually reflected ambient light. Under typical home or office viewing conditions, it's very typical to see delivered contrast ratios of not more than 50:1 to 100:1.OLEDs suffer from some of the same problems, but given the digital nature of the video chain driving them and the OLED drivers themselves, it's relatively easy to ensure that the OLED is actually not emitting at all when a black level signal is received, while still showing all the gray levels with the correct tone response ("gamma") curve. OLEDs have also very often included a front circular polarizing filter, which has the effect of greatly reducing reflected ambient light.
Differentiate between CRT and LCD monitor?
CRT Monitors Sort for cathode-ray tubes, CRT monitors were the only choice consumers had for monitor technology for many years. Cathode ray tube (CRT) technology has been in use for more than 100 years, and is found in most televisions and computer monitors. A CRT works by moving an electron beam back and forth across the back of the screen. Each time the beam makes a pass across the screen, it lights up phosphor dots on the inside of the glass tube, thereby illuminating the active portions of the screen. By drawing many such lines from the top to the bottom of the screen, it creates an entire screen of images. LCD/Flat panel Monitors Short for liquid crystal display, LCD technology can be found in digital watches and computer monitors. LCD displays use two sheets of polarizing material with a liquid crystal solution between them. An electric current passed through the liquid causes the crystals to align so that light cannot pass through them. Each crystal, therefore, is like a shutter, either allowing light to pass through or blocking the light. Color LCD displays use two basic techniques for producing color: Passive matrix is the less expensive of the two technologies. The other technology, called thin film transistor (TFT) or active-matrix, produces color images that are as sharp as traditional CRT displays, but the technology is expensive.
Which one is more harmful for the eyes: LCD, LED or CRT TV?
Images in the electronic devices like computer are created from thousands of tiny dots. Unlike the high contrast of printed matter, there is no distinct image in those electronic devices for your eye to actually focus on. Your eyes strain to focus and refocus to keep the images sharp.The presence of glare and reflections on the screen from the lighting can make viewing difficult. Different distances and angles also result in aggravating the issue. The constant readjustments of your eyes to accommodate all these factors cause you to open your eyes wider. This can lead to your eyes getting dry.Blinking is an essential component to keeping our eyes healthy. When looking at a screen you blink two-third times less than usual. Less of blinking strains and dries your eyes.Ideally, the screen should be at eye level or the top of the screen should be at 17 degrees above the eye level. Laptops disturb the eye level. This naturally forces you to stare at the screen and blink lesser number of times, causing eye strain and headache.Staring at the computer screen or television for prolonged periods can stress the eye muscles to a great extent and trigger twitching.Old tube-style monitor (called a cathode ray tube or CRT) screens can cause a noticeable ‘flicker’ of images and strain the eye. They can emit a small amount of X-ray radiation which is widely considered not harmful.Newer display technologies are liquid crystal display (LCD), plasma display, and OLED. To produce a visible image, most LCDs are illuminated from the front or back of the display panel. Older LCDs have CCFL backlit monitor. The newer LED backlit monitors use pulse width modulation (PWM) to alter their brightness. Most of the computer monitors, mobile phones, tablets and television screens have them. PWM can cause distracting visual effects. And according to a research [1], prolonged and continuous exposure to short-wave, high-energy visible light in violet/blue end of the visible light spectrum of LED lights can cause irreparable damage to the retina of the eye.
A TV tube requires a 20.0 kV amplitude power supply.?
a) What is the turns ratio of the transformer that raises the 170 V amplitude household voltage to 20.0 kV? (b) If the tube draws 81 W of power, find the currents in the primary and secondary windings. Assume an ideal transformer. I1= I2= Answer this correctly first and get best answer!
How can high voltage be produced in portable CRT TVs?
Dc battery power is turned into pulsing DC and fed through a transformer. a simple example of similar conversion is an automobile spark-plug coil system. While today they are electronic ignitions, where mechanical points are replaced with electronic switching, in the early versions they used a mechanical set of point contacts with a lobe that would open an close the points controlling the negative or ground of a coil. The positive 12 volts was present on the positive input of the coil primary, and by opening and closing the points contact, a pulsating DC would be the effect going into the primary input of the coil allowing for transformer action which would step up the voltage to a high voltage output that would be directed to the spark plugs.
Where in America can I find a CRT television with SCART input?
I'm one of those retro gamers who wants to get a perfect picture with my old consoles. And new LCD's don't deliver when it comes to older games. I've been searching Craigslist for ages, but there's no way I can find anything there. I want a CRT TV that has a 4:3 aspect ratio, is at least 32", and has a SCART input on the back. That's it. I wouldn't have the slightest idea of how to install one on to a TV, though I've heard of it being done. I've searched European sites just to know what I'm looking for, but I don't know how to find one in America. Is there a website or a store chain or anything that can help me get my hands on one?