Strip mask

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Macro shot of a monitor with a striped mask

The strip mask was invented by the Sony company and marketed under the trade name Trinitron . The system is a thin network of vertical wires, which is mounted in color picture tubes behind the screen . Unlike the shadow mask and the slit mask , a strip mask consists of vertically stretched wires or sheet metal strips that are not horizontally connected to one another.
Strip mask tubes are particularly used in professional monitors, as they are characterized by particularly high light intensity and excellent image quality.

The electron beam passes through the space between two wires on the luminous layer , which then emits the corresponding color as visible light. As with the slit and shadow mask tube, the stripe mask shades the respective colored stripes from the electrons of the "wrong" electron beams (see slit mask ). Here, too, the luminescent layer consists of the three basic colors red, green and blue, which are arranged as vertical stripes next to one another, as in the case of the slot mask tube. Any colors can be represented in this way through the additive color mixing .

Due to its construction, the strip mask is particularly sensitive to mechanical vibrations. For this reason, two horizontal holding wires are sometimes used in monitors to give the wire mesh the necessary support.
The required mechanical tension of the many wires requires a stiff, solid steel frame inside the tube, even with a holding wire. The wires are often designed as strips made from sheet metal. The width of the sheet metal strip covers the entire width of the screen. In the sheet metal strip, strips with the full height of the image are etched in the area of ​​the image. The sheet metal strip is spot welded onto the frame under pretension.

The illustration opposite shows a macro image of a screen with a striped mask. The full-size image clearly shows the horizontal retaining wire that stretches across the entire screen. The two retaining wires are particularly visible on light backgrounds, but hardly interfere with use.
Because of their design, strip mask monitors have a higher permeability for electron beams than monitors with a pinhole or slit mask . As a result, less energy is converted into heat , but more into light. This results in a higher luminance and a better contrast .

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