Convergence error detecting apparatus capable of being applied t

Details Convergence error detecting apparatus capable of being applied t Convergence error detecting apparatus capable of being applied t

1994-03-15

1996-07-02

Metjahic, Safet

Television

Video display

Projection device

348807, H04N 928, H04N 3227

Patent

active

055327648

ABSTRACT:
In a convergence error detecting apparatus for use in combination with a display system of a projection type which displays, onto a display panel, a projected image signal which has a first synchronization signal of a predetermined frequency, and for detecting a convergence error signal representative of a convergence error appearing on the projected image signal, image pickup device is operated by a second synchronization signal of a frequency different from the predetermined frequency, for picking up the projected image signal to produce a pickup image signal by the use of the second synchronization signal, and processing unit processes the pickup image signal to detect the convergence error and to produce a convergence error signal representative of the convergence error. The convergence error signal is supplied to the display system to remove the convergence error in the display system.

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