Z90251 Datasheet, PDF (36/97 Pages) Zilog, Inc. – eZVision 200 Television Controllers with OSD

Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
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7th Row
8 th Row
9th Row
(3)
(4 )
1st Column
(5)
(6)
2nd Column
Figure 9 Second Color Display
(7)
(8)
(9)
3rd Column
Bar Column Position
5.3 Mesh and Halftone Effect
Mesh is a grid-like area that contains an alternating pixel display of OSD and
transparent zones. See Figure 10. The transparent zones allow the TV signal
display to appear in part while the mesh display is active.
Halftone effect is a transparent area that appears slightly darker than the regular
picture carried by the TV signal.
Mesh and halftone effects both serve as backgrounds for menus, action bars, and
other On-Screen Displays. The mesh feature is only for interlaced-mode video
systems.
Mesh can be controlled in two ways: through hardware or through software for
alternating pixel display in different fields.
PS001301-0800