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Disclosed is a method for automatically changing the G1 bias of a Cathode Ray Tube (CRT) during the manufacturing alignment of a VDT.
English (United States)
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G1 Bias Circuit for Video Display Terminals (VDT)
Disclosed is a method for automatically changing the G1 bias of a Cathode
Ray Tube (CRT) during the manufacturing alignment of a VDT.
The manufacturing of a VDT involves two basic processes. The first process
involves some simple assembly; mounting a CRT in a bezel, mounting a card
assembly and attaching a rear cover. The second process is the actual
alignment of the front-of-screen (FOS) which includes the screen geometry as
well as the color balance (making 'white' appear white).
This disclosure describes a simple circuit that allows the CRT bias to be
changed electronically via computer control with the machine's covers installed.
This is considered advantageous to manufacturing. The need to change the
CRT bias during alignment is dictated by the state of the art in the light meters
used by manufacturing to adjust the color balance of the VDT. The circuit itself is
a transistor switch that allows a higher voltage to be applied to the G1 grid of the
CRT for the duration of the color balance adjustment. The circuit is driven by an
LSI module that is compatible with the Philips I2C Bus, an inexpensive 2-wire
bus that communicates with the manufacturing test equipment.