Convergence correction system with recovery function and display apparatus using the same

A convergence correction system used for a TV set or a display, the convergence correction system comprising:

• a first memory for memorizing correction data for convergence correction;
• an address generator for generating an address for reading the correction data from the first memory according to scanning of a screen;
• a waveform generator for generating a convergence correction waveform based on the correction data read by the address generator;
• a pattern generator for generating adjustment patterns;
• a first convergence adjuster for changing the correction data memorized in the first memory according to an adjustment operation for convergence correction which is executed during display of the adjustment patterns generated by the pattern generator;
• a second memory for memorizing the correction data memorized in the first memory as changed by the first convergence adjuster;
• eight photodetectors which are arranged at positions at substantially the middle of each of upper, lower, left, and right sides of the screen and at substantially four corners of the screen and detect video light incident on the positions;
• an analog-digital converter for converting outputs of the photodetectors to digital values;
• a second convergence adjuster for changing the correction data memorized in the first memory so as to correct mislocation of the displayed adjustment patterns at substantially the positions at which the eight photodetectors are arranged on the basis of the digital values obtained by the analog-digital converter;
• a third memory for memorizing the correction data memorized in the first memory as changed by the second convergence adjuster;
• and
• a calculator for calculating final correction data to be memorized in the first memory on the basis of the correction data memorized in the second memory of the correction data memorized in the third memory.

A convergence correction system used for a TV set or a display, the convergence correction system comprising:

• a first memory for memorizing correction data for convergence correction;
• a waveform generator for generating a convergence correction waveform based on the correction data memorized in the first memory;
• a first correction data generator for generating first correction data according to manual adjustment of convergence;
• eight photodetectors which are arranged at positions at substantially the middle of each of upper, lower, left, and right sides of a screen and at substantially four corners of the screen and detect video light incident on the positions;
• a second correction data generator for generating second correction data for correcting mislocation of displayed adjustment patterns at substantially the positions at which the eight photodetectors are arranged on the basis of outputs of the photodetectors;
• and
• a correction data corrector for correcting the correction data memorized in the first memory on the basis of the first correction data generated by the first correction data generator and the second correction data generated by the second correction data generator.

A convergence correction system used for a TV set or a display, the convergence correction system comprising:

• a waveform generator for receiving correction data for convergence correction and generating a convergence correction waveform based on the correction data;
• eight photodetectors which are arranged at positions at substantially the middle of each of upper, lower, left, and right sides of a screen and at substantially four corners of the screen and detect video light incident on the positions;
• a correction data generator for generating correction data for correcting mislocation of displayed adjustment patterns at substantially the positions at which the eight photodetectors are arranged on the basis of outputs of the photodetectors;
• and
• a correction data corrector for correcting the correction data received by the waveform generator on the basis of the correction data generated by the correction data generator.

A convergence correction system used for a TV set or a display, the convergence correction system comprising:

• a waveform generator for receiving correction data for convergence correction and generating a convergence correction waveform based on the correction data;
• eight photodetectors which are arranged at positions at substantially the middle of each of upper, lower, left, and right sides of a screen and at substantially four corners of the screen and detect video light incident on the positions;
• a correction data generator for generating correction data for convergence correction at substantially the positions at which the eight photodetectors are arranged on the basis of outputs of the photodetectors;
• and
• a correction data corrector for correcting the correction data received by the waveform generator on the basis of the correction data generated by the correction data generator.