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

Abstract

The processing device includes parts: line scan correction module; first D / A conversion module connected to the line scan correction module; CRT display connected to the first D / A module; data acquisition module (DAM) connected to CRT display; EHT signal process module connected to DAM and the line scan correction module; field negative peak process module connected to DAM; field scan correction module connected to field negative peak process module and EHT signal process module; pulse width modulation (PWM) process module connected to field scan correction module; power amplifier module connected to PWM module, DAM, and CRT display; the invention also discloses process method for correcting scanning distortion of display tube. Correcting process includes steps: EHT signal picked up is processed to be as gain for EHT compensation; field negative peak signal generates correction sawtooth wave. The invention possesses good effect of correcting image.

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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