Modulation circuit and image display using the same

A modulation circuit for modulating an input data on a pulse width and a pulse amplitude in response to the value of the input data and generating a pulse signal at a predetermined period, comprising

• a data outputting circuit which compares the input data with a plurality of preset initial phase data at phases of the period corresponding to the initial phase data, and as a result of the comparison, outputs a pulse width data corresponding to a difference between a value of one of the initial phase data and that of the input data and a specified pulse amplitude data corresponding to the initial phase data when the phase corresponding to one of the initial phase data is earlier than the phase corresponding to the input data;
• a phase data generating circuit for generating a phase data whose value is varied in response to a phase in the period;
• a data comparison circuit for setting a control signal at a first level at the beginning of every period, comparing the phase data and the pulse width data, and setting the control signal at a second level when the phase data and the pulse width data coincide;
• and
• a pulse signal generating circuit for setting the level of the pulse signal at a reference level at the beginning of every period, changing the level of the pulse signal in response to the pulse amplitude data when the control signal is at the first level, setting the level of the pulse signal at the reference level when the level of the control signal is changed to the second level, and outputting the resultant pulse signal.

An image display comprising

• a plurality of modulation circuits each modulating an input data on a pulse width and a pulse amplitude in response to the value of the input data and generating a pulse signal at a predetermined period;
• and
• a plurality of light emitting elements arranged bi-dimensionally to form an image displaying member and each emitting light of a luminance corresponding to levels of the pulse signals,
• wherein each modulation circuit comprises
• a phase data generating circuit for generating a phase data whose value is varied in response to a phase in the period;
• a data comparison circuit for setting a control signal at a first level at the beginning of every period, comparing the phase data and the input data, and setting the control signal at a second level when the phase data and the input data coincide;
• and
• a pulse signal generating circuit for setting the level of the pulse signal at a reference level at the beginning of every period, changing the level of the pulse signal in response to the phase data when the the control signal is at the first level, setting the level of the pulse signal at the reference level when the level of the control signal is changed to the second level, and outputting the resultant pulse signal.

An image display comprising

• a plurality of modulation circuits each modulating an input data on a pulse width and a pulse amplitude in response to the value of the input data and generating a pulse signal at a predetermined period;
• and
• a plurality of light emitting elements arranged bi-dimensionally to form an image displaying member and each emitting light of a luminance corresponding to levels of the pulse signals,
• wherein each modulation circuit comprises
• a data outputting circuit which compares the input data with a plurality of preset initial phase data at phases of the period corresponding to the initial phase data, and as a result of the comparison, outputs a pulse width data corresponding to a difference between a value of one of the initial phase data and that of the input data and a specified pulse amplitude data corresponding to the initial phase data when the phase corresponding to one of the initial phase data is earlier than the phase corresponding to the input data;
• a phase data generating circuit for generating a phase data whose value is varied in response to a phase in the period;
• a data comparison circuit for setting a control signal at a first level at the beginning of every period, comparing the phase data and the pulse width data, and setting the control signal at a second level when the phase data and the pulse width data coincide;
• and
• a pulse signal generating circuit for setting the level of the pulse signal at a reference level at the beginning of every period, changing the level of the pulse signal in response to the pulse amplitude data when the control signal is at the first level, setting the level of the pulse signal at the reference level when the level of the control signal is changed to the second level, and outputting the resultant pulse signal.