Talk:Shadow mask

Types of shadow masks

The dot triad type has an individual hole for every red, green and blue phosphor dot.

A later development used square or rectangular holes, each masking a vertical section of a trio of red, green and blue stripes. This design allowed for the enhanced brightness of the Trinitron design while eliminating the spacing wires and avoiding infringement on the Trinitron patent even though the three electron beams were arranged in a horizontal line like the Trinitron, instead of a triad like the earlier type. This type also allowed the more conventional spherical profile front instead of the costlier cylindrical shape used by the Trinitron.

After the grid mask (I don't know what any manufacturer called it) was first used in the 1980's (large numbers used in arcade videogames), few CRT televisions have used the older dot triad style due to the higher brightness possible at lower electron beam power with the grid mask.

Truly flat CRT displays are manufactured by heating and stretching the aperture grille or shadow mask then forming a frame (usually glass) around the edges. Tension is held until the frame material cools or sets. The grill or mask and frame is then bonded between the front glass and rear shell of the tube.

This design eliminates any distortions due to its own heat since the grille or mask is heated to a higher temperature during manufacture than it will ever reach in normal operation.

Just some more random info for someone to tuck into the article if they care to research and format it into something readable.

Removed the picture who compared Shadow mask and aperture grilll, because it was a picture of two different shadow mask screens one from a computer and one from a tv set, and not a aperture grill and a shadow mask.--88.88.15.218 01:25, 16 February 2007 (UTC)

is that the image currently labeled "Comparison between aperture grille(left) and shadow mask(right)" ? It should be fixed. --Xerces8 (talk) 12:47, 14 September 2008 (UTC)

Photo

It would be nice to have a picture of the mask itself, outside of a monitor. 155.212.242.34 22:32, 15 November 2007 (UTC)

little error in the introduction

My english is not good enough to correct it but I hope someone will do it. This sentance is wrong : “The other approach is aperture grille, better known by its trade name, Trinitron.”

Trinitron is only one of the aperture grille applications, DiamondTron being another one, for example. Kind regards, Freewol (talk) 11:30, 11 March 2011 (UTC)

It seems to be licensed from Sony. The better known is still true, though. Gah4 (talk) 21:28, 13 September 2018 (UTC)

Shadow Mask - unclear

In the section "Shadow mask", it is unclear who the rest of the section talks about -- Werner Flechsig or Al Schroeder. — Preceding unsigned comment added by 31.4.244.130 (talk) 13:26, 1 January 2015 (UTC)

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Triangles

The red, green, and blue phosphors for each pixel are generally arranged in a triangular shape (sometimes called a "triad"). For television use, modern displays (starting in the late 1960s) use rectangular slots instead of circular holes, improving brightness. Note that these sentences are adjacent, and don't agree. With the transition to rectangular slots, the phosphors aren't triangular. Also, the phosphor dots aren't "pixels" in the usual sense, as they are normally much smaller than the pixels of a digital display. Gah4 (talk) 04:41, 10 August 2016 (UTC)

Also, For much of the time during the scan, the beams would hit the back of the plate and be stopped. However, when the beams passed a hole they would continue to the phosphor in front of the plate. The electron beam spot is normally much larger than the shadow mask holes or aperture grill spacing. The beam covers many dots at once, and so at no time does the beam not hit any phosphor dots (or bars). Gah4 (talk) 04:44, 10 August 2016 (UTC)

The shadow masking technique uses raster scan.

The article says The shadow masking technique uses raster scan which is usually the case, but I don't see why it wouldn't work with a vector graphics system. I don't happen to know any color vector systems, though. Gah4 (talk) 17:52, 1 May 2017 (UTC)

It seems that the Atari Quadrascan, used in some arcade games, uses a conventional shadow mask CRT, with a deflection yoke designed for vector graphics. Raster scan yokes have too much inductance on the vertical coil, as the sweep rate is low enough. So, there is at least one example. Gah4 (talk) 21:42, 13 September 2018 (UTC)