41 Facts About CRT screen

The earliest version of the CRT screen was known as the "Braun tube", invented by the German physicist Ferdinand Braun in 1897.

CRT screen expanded on his vision in a speech given in London in 1911 and reported in The Times and the Journal of the Rontgen Society.

The Trinitron CRT screen was identical with its upright cylindrical shape due to its unique triple cathode single gun construction.

In 2015, several CRT screen manufacturers were convicted in the US for price fixing.

Also, CRT screen monitors are often capable of displaying sharp images at several resolutions, an ability known as multisyncing.

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Neck is made from a glass tube while the funnel and CRT screen are made by pouring and then pressing glass into a mold.

The optical properties of the glass used on the screen affects color reproduction and purity in Color CRTs.

CRT screen glass used to be made by dedicated companies such as AGC Inc, O-I Glass, Samsung Corning Precision Materials, Corning Inc, and Nippon Electric Glass; others such as Videocon, Sony for the US market and Thomson made their own glass.

The amount of x-rays emitted by a CRT screen can lowered by reducing the brightness of the image.

The CRT screen is usually instead made out of a special lead-free silicate glass formulation with barium and strontium to shield against x-rays.

The lead in the glass causes it to brown with use due to x-rays, usually the CRT screen cathode wears out due to cathode poisoning before browning becomes apparent.

The size of the CRT screen is the viewable image size plus its black edges which are not coated with phosphor.

Anode is used to accelerate the electrons towards the screen and collects the secondary electrons that are emitted by the phosphor particles in the vacuum of the CRT.

Design of the high voltage power supply in a product using a CRT screen has an influence in the amount of x-rays emitted by the CRT screen.

The brightness of the CRT screen is not controlled by varying the anode voltage nor the electron beam current despite them having an influence on image brightness, rather image brightness is controlled by varying the difference in voltage between the cathode and the G1 control grid.

One of the ends of the electron gun has a glass disk, the edges of which are fused with the edge of the neck of the CRT screen, possibly using frit; the metal leads that connect the electron gun to the outside pass through the disk.

The stage contains a capacitor that is in series with the horizontal deflection coils that performs several functions, among them are: shaping the sawtooth deflection signal to match the curvature of the CRT screen and centering the image by preventing a DC bias from developing on the coil.

The electron beam is steered by varying the voltage difference across plates in a pair; For example, applying a voltage to the upper plate of the vertical deflection pair, while keeping the voltage in the bottom plate at 0 volts, will cause the electron beam to be deflected towards the upper part of the CRT screen; increasing the voltage in the upper plate while keeping the bottom plate at 0 will cause the electron beam to be deflected to a higher point in the CRT screen .

The heating and cooling are done gradually to avoid inducing stress, stiffening and possibly cracking the glass; the oven heats the gases inside the CRT screen, increasing the speed of the gas molecules which increases the chances of them getting drawn out by the vacuum pump.

The getter material which is often barium-based, catches any remaining gas particles as it evaporates due to heating induced by the RF coil ; the vapor fills the CRT screen, trapping any gas molecules that it encounters and condenses on the inside of the CRT screen forming a layer that contains trapped gas molecules.

Early red and green phosphors contained Cadmium, and some black and white CRT screen phosphors contained beryllium powder, although white phosphors containing cadmium, zinc and magnesium with silver, copper or manganese as dopants were used.

The shadow mask is installed to the screen using metal pieces or a rail or frame that is fused to the funnel or the screen glass respectively, holding the shadow mask in tension to minimize warping and allowing for higher image brightness and contrast.

Higher deflection angles in color CRTs directly affect convergence at the corners of the screen which requires additional compensation circuitry to handle electron beam power and shape, leading to higher costs and power consumption.

Picture tube CRTs have overscan, meaning the actual edges of the image are not shown; this is deliberate to allow for adjustment variations between CRT TVs, preventing the ragged edges of the image from being shown on screen.

Aluminum eliminates the need for ion traps, necessary to prevent ion burn on the phosphor, while reflecting light generated by the phosphor towards the CRT screen, managing heat and absorbing electrons providing a return path for them; previously funnels were coated on the inside with aquadag, used because it can be applied like paint; the phosphors were left uncoated.

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Interior aquadag or aluminum coating was the anode and served to accelerate the electrons towards the CRT screen, collect them after hitting the CRT screen while serving as a capacitor together with the outer aquadag coating.

The CRT screen has a single uniform phosphor coating and no shadow mask, technically having no resolution limit.

Funnel is coated with aquadag on both sides while the CRT screen has a separate aluminum coating applied in a vacuum.

The inner side of the CRT screen is coated with phosphor particles suspended in PVA photoresist slurry, which is then dried using infrared light, exposed, and developed.

The CRT is then baked in an oven in what is called a Lehr bake, to cure the frit, sealing the funnel and screen together.

Convergence and purity are distinct parameters; a CRT screen could have good purity but poor convergence, or vice versa.

Each CRT screen has its own glycol, which has access to an air bubble to allow the glycol to shrink and expand as it cools and warms.

The CRT screen often had two colors, often a bright short persistence color that only appeared as the beam scanned the display and a long persistence phosphor afterglow.

When displaying fast one-shot events, the electron beam must deflect very quickly, with few electrons impinging on the CRT screen, leading to a faint or invisible image on the display.

The first CRT screen using this technology was introduced by Mitsubishi Electric for the 1980 Major League Baseball All-Star Game.

Slimmer CRT screen had the trade names Superslim, Ultraslim, Vixlim and Cybertube and Cybertube+ .

Density of the x-rays that would be generated by a CRT is low because the raster scan of a typical CRT distributes the energy of the electron beam across the entire screen.

Early CRTs had a glass plate over the screen that was bonded to it using glue, creating a laminated glass screen: initially the glue was polyvinyl acetate, while later versions such as the LG Flatron used a resin, perhaps a UV-curable resin.

Under some circumstances, the signal radiated from the electron guns, scanning circuitry, and associated wiring of a CRT screen can be captured remotely and used to reconstruct what is shown on the CRT screen using a process called Van Eck phreaking.

Funnel can be separated from the screen of the CRT using laser cutting, diamond saws or wires or using a resistively heated nichrome wire.

Considerable portion of CRT screen glass is landfilled, where it can pollute the surrounding environment.