Cromaclear is a CRT technology pioneered by NEC during the mid to late-90s. It was claimed that Cromaclear could offer the image clarity and sharpness of the Trinitron and Diamondtron aperture grille CRTs without the disadvantages e.g. the horizontal damping wires.
The most significant difference between CROMACLEAR CRTs and existing CRT technologies is their viewable phosphor pattern. When combined with the slot mask, the red, green and blue (RGB) P22 phosphors of the CROMACLEAR CRT appear elliptical in shape, compared to round phosphors (used in dot-trio CRTs) and stripes (used in aperture-grille CRTs). The illuminated phosphors of the CROMACLEAR CRT are also grouped into separate bundles of three in a vertical alignment, providing improved clarity and focus.
With the CROMACLEAR CRT, the conventional "dot pitch" measurement is no longer applicable. The term "mask pitch" is more appropriate when discussing this specification. A mask pitch measurement is the distance between like-colored phosphors on the CROMACLEAR CRT mask. The mask pitch of the CROMACLEAR CRT is 0.25 mm dpi.
As mentioned earlier, the CROMACLEAR CRT incorporates a new mask shape and alignment. As a result, the electron beam used to pass through the slot mask had to be adapted to match. The ELA gun utilized in CROMACLEAR CRTs has an exact beam/mask match (an elliptical electron beam passes through an elliptical mask opening) for maximum power transfer from electron beam to screen phosphors with no energy spillage onto the slot mask.
Although it was possible to use existing round phosphor gun technology with the CROMACLEAR CRT, a certain percentage of electron power would have been lost, thereby degrading overall image focus. An effective visual to describe this phenomenon is a "round peg, square hole" analogy: while contact might be taking place, it’s not completely precise. Excess energy transfer could lead to a warped grille or mask, resulting in possible image degradation (color purity and/or brightness uniformity problems). This mismatch tends to occur in aperture grille CRTs (stripe grille/circular electron beam). On the other hand, dot trio CRTs match a circular beam to a circular shadow mask.
This combination of dynamic beam focus and new electron guns also reduces the need for end-user moiré and convergence controls.
Contrast has a symbiotic relationship with overall CRT brightness: the higher the overall CRT brightness, the better the overall image contrast. As such, high contrast images cannot be achieved on CRTs with poor light output. These high levels are fundamental bases for the CROMACLEAR CRT.
Again, CROMACLEAR CRT color saturation levels work in combination with the other components to provide better overall image quality.
In addition, damping wires are highly sensitive and are more susceptible to shipping damage. They also have the potential to be affected by harmonic distortion when speakers are placed near the CRT.
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