Modulation circuit and image display using the same

A modulation circuit for outputting a pulse signal modulated in accordance with a value of input data by a predetermined period comprising:

• a clock generation circuit for generating and outputting a first clock pulse having a frequency in accordance with the value of said input data;
• a clock counting circuit for receiving said first clock pulse, counting said first clock pulse from a predetermined initial value in an initial stage of said predetermined period, and outputting a clock count;
• and
• a pulse signal output circuit for comparing magnitudes of said clock count and the value of said input data and inverting a level of said pulse signal in the vicinity of a time when the magnitudes of said clock count and the value of said input data invert.

An image display having a light emission element receiving a pulse signal modulated in accordance with a value of input data and emitting light with a luminance in accordance with the level of said pulse signal comprising:

• a clock generation circuit for generating and outputting a first clock pulse changing in frequency by a predetermined period;
• a clock counting circuit for receiving said first clock pulse, counting said first clock pulse from a predetermined initial value in an initial stage of said predetermined period, and outputting a clock count;
• and
• a pulse signal output circuit for comparing magnitudes of said clock count and the value of said input data and inverting a level of said pulse signal in the vicinity of a time when the magnitudes of said clock count and the value of said input data invert.

An image display having a light emission element receiving a pulse signal modulated in accordance with a value of input data and emitting light with a luminance in accordance with the level of said pulse signal comprising:

• a clock generation circuit for generating and outputting a first clock pulse having a frequency in accordance with the value of said input data;
• a clock counting circuit for receiving said first clock pulse, counting said first clock pulse from a predetermined initial value in an initial stage of said predetermined period, and outputting a clock count;
• and
• a pulse signal output circuit for comparing magnitudes of said clock count and the value of said input data and inverting a level of said pulse signal in the vicinity of a time when the magnitudes of said clock count and the value of said input data invert.