Display driving method and apparatus

A display driving method which makes a luminance representation depending on a length of a light emission time, said display driving method comprising the steps of:

• (a) generating a first image signal having a gradation levels by carrying out an error diffusion process with respect to an input image signal having n gradation levels while satisfying a<n, where n, a and b are integers;
• (b) generating a second image signal having b gradation levels by carrying out an error diffusion process with respect to the input image signal while satisfying b<a<n;
• and
• (c) switching between the first image signal and the second image signal in units of pixels within a line and outputting the switched one of the first and second image signals.

A display driving apparatus which makes a luminance representation depending on a length of a light emission time, said display driving apparatus comprising:

• a first processing path generating a first image signal having a gradation levels from an input image signal having n gradation levels while satisfying a.ltoreq.n, where n, a and b are integers;
• a second processing path generating a second image signal having b gradation levels from the input image signal while satisfying b<a.ltoreq.n;
• and
• switching means for switching between the first image signal and the second image signal in units of pixels within a line and outputting the switched one of the first and second image signals.

The display driving apparatus which makes a luminance representation depending on a length of a light emission time, said display driving apparatus comprising:

• a first processing path generating a first image signal having a gradation levels by carrying out an error diffusion process with respect to an input image signal having n gradation levels while satisfying a<n, where n, a and b are integers;
• a second processing path generating a second image signal having b gradation levels by carrying out an error diffusion process with respect to the input image signal while satisfying b<a<n;
• and
• switching means for switching between the first image signal and the second image signal in units of pixels within a line and outputting the switched one of the first and second image signals.

A display unit comprising:

• a display which makes a luminance representation depending on a length of a light emission time;
• a first processing path generating a first image signal having a gradation levels from an input image signal having n gradation levels while satisfying a.ltoreq.n, where n, a and b are integers;
• a second processing path generating a second image signal having b gradation levels from the input image signal while satisfying b<a.ltoreq.n;
• and
• switching means for switching between the first image signal and the second image signal in units of pixels within a line and outputting the switched one of the first and second image signals.

A display unit comprising:

• a display which makes a luminance representation depending on a length of a light emission time;
• a first processing path generating a first image signal having a gradation levels by carrying out an error diffusion process with respect to an input image signal having n gradation levels while satisfying a<n, wherein, a and b are integers;
• a second processing path generating a second image signal having b gradation levels by carrying out an error diffusion process with respect to the input image signal while satisfying b<a<n;
• and
• switching means for switching between the first image signal and the second image signal in units of pixels within a line and outputting the switched one of the first and second image signals.