Picture-tube scanning distortion correction processing device and processing method therefor

Abstract

The invention relates to a kinescope scanning distortion correction processing device, comprising: a row scan correction module; a first digital-to-analog conversion module connected to the row scan correction module; a CRT display connected to the first digital-to-analog conversion module; a data acquisition module connected to the first digital-to-analog conversion module The CRT display is connected; the EHT signal processing module is connected with the data acquisition module and the line scan correction module; the field anti-peak processing module is connected with the data acquisition module; the field scan correction module is connected with the field anti-peak processing module and the EHT signal processing The modules are connected; the PWM processing module is connected with the field scanning correction module; the power amplifier module is connected with the pulse width modulation module, the data acquisition module and the CRT display. The invention also relates to a processing method for correcting the scanning distortion of the picture tube. The extracted EHT signal is processed as the gain of the EHT compensation, and the field anti-peak signal generates a corrected sawtooth wave to correct the scanning distortion of the picture tube. The image correction effect of the invention is good.

Description

technical field [0001] The invention relates to a picture tube scanning distortion correction processing device and processing method, in particular to a picture tube scanning distortion correction processing device and processing method utilizing digital signal processing. Background technique [0002] In the CRT picture tube, due to the non-linear distortion of the field scanning current and the line scanning current, the asymmetry of the deflection coil placement, and the extensibility distortion caused by the screen of the picture tube, etc., the distortion of the CRT picture tube in the field direction and the horizontal direction is caused. , specifically manifested as nonlinear distortion and geometric distortion of the display grating. [0003] In order to overcome these distortions, most of the existing correction processing devices and correction processing methods use analog circuits to generate pre-distorted voltage waveforms, and overcome the distortion of the d...

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Problems solved by technology

[0004] However, these existing correction devices and correction methods that utilize analog circuits to generate predistorted voltage waveforms have poor correction effects behind modern multi-standard TVs / large-screen TVs, and these analog correction devices and correction methods are increasingly unable to meet People have higher and higher requirements for the quality of TV pictures, and the user experience is relatively poor, and the existing analog circuits cannot achieve smooth adjustment in a large range, and jumps may occur. In addition, the use of analog circuits for correction not only requires complex circuits , and the power consumption is also very large

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