KR870010729A - Scanning CRT Electronic Beam Calibration Control Circuit - Google Patents

Abstract

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Description

Scanning CRT Electronic Beam Calibration Control Circuit

Since this is an open matter, no full text was included.

1 is a schematic diagram of a dynamic focus calibration system.

2A-2C are schematic diagrams of a CRT target screen illustrating the focal voltage as a function of the screen position of the electron beam.

3 is a series of graphs from a to 1 corresponding to signals provided by the system shown in FIG.

Claims (10)

A scanning CRT electron beam 13A calibration control circuit defining at least one image frame on the CRT target screen 14, First means 19 to 22 for supplying a first signal 103 whose magnitude varies depending on the horizontal position of the scanning electron beam 13A used to generate at least one image frame on the CRT target screen 14. , 26, 32 to 33, 35 to 40), Second means (16 to 17, 24, 27, 42 to 51) for supplying a second signal (107) that varies with the vertical position of the scanning electron beam used to generate the image frame; The first and second means for receiving the first and second signals 103, 107 and for supplying a resultant signal 108 having a varying magnitude as a function of the effective combination of the first and second signal magnitudes. A combiner means 34 coupled to the Circuit means (60-64, 70-85) for receiving a preferred CRT electron beam calibration signal (100) in response to at least said result signal (108) and for supplying said signal to a CRT electrode, wherein said preferred calibration The circuit 100 has a magnitude that varies between maximum and minimum magnitudes during generation of the image frame at least in accordance with the resulting signal magnitude, Scanning CRT electronics comprising the circuit means comprising centering means (80 to 85) for tightening at least one of the maximum / minimum magnitude of the calibration signal (100) to an adjustable DC signal level (86) Beam calibration control circuit. The method of claim 1, The combiner means 34 comprising multiplier means 34 for receiving the first and second signals 103 and 107 and for supplying the red signal 108 as the resulting signal, the magnitude of the red signal being Scanning CRT electron beam calibration control circuit, characterized in that it varies as a function of an effective function of the first and second signal magnitudes. The method of claim 2, Upper coupled to the circuit means 60-64, 70-85 for supplying the upper / lower calibration signal 111 having a magnitude that varies with the vertical position of the scanning electron beam 13A to the circuit means. / Lower adjustment means (65 to 6 8), the magnitude of the preferred signal 100 is characterized in that it is determined in accordance with the magnitude of the upper / lower calibration signal 111 and the drop signal 108 CRT electronic beam calibration control circuit. The method of claim 3, wherein The circuit means 60-64, 70-85 efficiently add the upper / lower calibration signal 111 to the product signal 108 in order to supply the combined signal 110 which determines the desired calibration signal. And a valid signal adder circuit (60 to 64) for the scanning CRT electron beam calibration control circuit. The method of claim 4, wherein Each of the first and second means, respectively, provides first, second, and third signals 32, 35 and 40 to supply peak-tight, tightened first and second signals 103, 107 as the first and second signals, respectively. Scanning means characterized in that it comprises two (42,43 to 51) tightening means, said multiplier means (34) multiplying the tightened first and second signals of said magnitude to supply said drop signal (108). CRT electronic beam calibration control circuit. The method of claim 5, The red signal 108 has a fixed peak level magnitude 55 as one envelope boundary 55 of the effective carrier and signal that varies in accordance with the first signal 103, and another envelope of the carrier signal. Scanning CRT electron beam calibration control circuit as a boundary (109) comprising a signal having another peak level that varies with the second signal (107). The method of claim 6, The first and second signals (103, 107) comprise horizontal and vertical electron beam position parabolic signals. The method of claim 3, wherein Separate corner 26 and side 27 adjustment means for independently adjusting the amount of variation in magnitude of the first 103 and second 107 signals, the signals 103, 107 being multipliers; A scanning (CRT) electron beam calibration control circuit, multiplied by (34), thereby adjusting the magnitude of the red signal (108). The method of claim 8, The corner and side means 26 and 27 can be set respectively so that the red signal magnitude is initially constant for the electron beam position, and the red signal magnitude is adjusted so that it is along the beam position and the corner and the adjustment means 26, 27. A scanning CRT electronic beam calibration control circuit, characterized in that it varies according to the independent setting of < RTI ID = 0.0 > The method of claim 9, And said first and second signal magnitudes each have a periodic parabolic waveform representing the horizontal and vertical positions of said beam. ※ Note: The disclosure is based on the initial application.