Digital image correction device and display device

A digital image correction device for correcting the convergence at convergence correction points respectively corresponding to positions on a CRT screen displayed by raster scanning system, comprising:

• a memory storing convergence correction data for correcting the convergence at a convergence correction point as a relation pattern indicating the relative relation by one-bit data with the convergence correction data at the adjacent convergence correction point which is scanned previous to each convergence correction point;
• a reading circuit for reading out the convergence correction data from the memory in synchronism with raster scanning on the screen;
• a correction signal generating circuit for generating a convergence correction signal at the convergence correction point, on the basis of the relation pattern of the convergence correction data being read by the reading circuit;
• and
• a correction magnetic field generating circuit for generating a convergence correction magnetic field for correcting the convergence on the basis of the convergence correction signal generated by the correction signal generating circuit.

A digital image correction device for correcting the graphic distortion at graphic distortion correction points respectively corresponding to positions on a CRT screen displayed by raster scanning system, comprising:

• a memory storing graphic distortion correction data for correcting the graphic distortion at a graphic distortion correction point as a relation pattern indicating the relative relation by one-bit data with the graphic distortion correction data at the adjacent graphic distortion correction point which is scanned previous to each graphic distortion correction point;
• a reading circuit for reading out the graphic distortion correction data from the memory in synchronism with raster scanning on the screen;
• a correction signal generating circuit for generating a graphic distortion correction signal at the graphic distortion correction point, on the basis of the relation pattern of the graphic distortion correction data being read by the reading circuit;
• and
• a correction magnetic field generating circuit for generating a graphic distortion correction magnetic field for correcting the graphic distortion on the basis of the graphic distortion correction signal generated by the correction signal generating circuit.

A digital image correction device for correcting the white balance and uneven luminance at white balance and uneven luminance correction points respectively corresponding to positions on a CRT screen displayed by raster scanning system, comprising:

• a memory storing white balance and uneven luminance correction data for correcting the white balance and uneven luminance at a white balance and uneven luminance correction point as a relation pattern indicating the relative relation by one-bit data with the white balance and uneven luminance correction data at the adjacent white balance and uneven luminance correction point which is scanned previous to each white balance and uneven luminance correction point;
• a reading circuit for reading out the white balance and uneven luminance correction data from the memory in synchronism with raster scanning on the screen;
• a correction signal generating circuit for generating a white balance and uneven luminance correction signal at the white balance and uneven luminance correction point, on the basis of the relation pattern of the white balance and uneven luminance correction data being read by the reading circuit;
• and
• a video correction unit for correcting the white balance and uneven luminance, on the basis of the correction signal of white balance and uneven luminance generated by the correction signal generating circuit.

A digital image correction device for correcting the focus at focus correction points respectively corresponding to positions on a CRT screen displayed by raster scanning system, comprising:

• a memory storing focus correction data for correcting the focus at a focus correction point as a relation pattern indicating the relative relation by one-bit data with the focus correction data at the adjacent focus correction point which is scanned previous to each focus correction point;
• a reading circuit for reading out the focus correction data from the memory in synchronism with raster scanning on the screen;
• a correction signal generating circuit for generating a focus correction signal at the focus correction point, on the basis of the relation pattern of the focus correction data being read by the reading circuit;
• and
• a correction magnetic field generating circuit for generating a focus correction magnetic field for correcting the focus on the basis of the focus correction signal generated by the correction signal generating circuit.