Appeal No. 2001-2416
Application No. 08/843,978
Representative independent claim 7 is reproduced as follows:
7. A cathode ray tube display apparatus in which displays are realized
by line-by-line scanning of a display screen of a cathode ray tube by an
electron beam spot, the cathode ray display apparatus comprising:
a deflection circuit receiving a horizontal or a vertical position signal
for generating a deflection current for deflecting the electron beam spot in
a first direction, wherein the deflection current has a shape for obtaining
an approximate linear scan on the display screen in said first direction;
and
a circuit for generating a spot position indication signal for
indicating a position of said spot on the display screen, characterized in
that the circuit for generating a spot position indication signal comprises:
means for generating, in a certain scan period, a position
information related to the deflection current;
means for measuring a first instant as an instant at which
the position information has a first value;
means for measuring a second instant as an instant at which
the position information has a second value; and
means for calculating, in a later scan period, the spot position
indication signal as a linear function in time whereby, in a steady state
situation, the spot position indication signal has predetermined position
indication values at instants in this later scan period corresponding to the
first and the second instants, respectively, and the spot position indication
signal is independent of a width of the scan or the number of scanning
lines.
The examiner relies on the following references:
Hintze 4,499,457 Feb. 12, 1985
Kii 5,016,095 May 14, 1991
Kawashima 5,463,427 Oct. 31, 1995
Tanaka et al. (Tanaka) 5,504,496 Apr. 02, 1996
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