Predrive circuit, drive circuit and display device

A display device, comprising:

• plural electrodes for applying voltages to conduct discharge in display cells;
• plural output elements for supplying voltages, which change for each of said electrodes;
• a drive control circuit for outputting control signals for controlling said output elements;
• and
• plural predrive circuits for outputting flow signals to said output elements, when first reference potentials of the control signals are different from second reference potentials of said output elements, the flow signals being based on the control signals output from said drive control circuit and corresponding to the second reference potentials of said output elements.

A predrive circuit for driving an output element having a second reference potential which is different from a first reference potential of an input signal, comprising:

• a comparison circuit for comparing the input signal having the first reference potential with a reference voltage signal having a voltage value as a reference for comparison;
• an input level shift circuit for converting the input signal having the first reference potential, based on a result of comparison from said comparison circuit, to a second signal corresponding to a substrate potential generated from the second reference potential, thereby outputting the second signal;
• an output level shift circuit for converting the second signal output from said input level shift circuit to a third signal corresponding to an output power supply voltage, thereby outputting the third signal;
• and
• a signal amplification circuit for amplifying the third signal output from said output level shift circuit, thereby outputting a drive signal for driving said output element.

A predrive circuit for driving a first output element having a second reference potential against a first reference potential of a first input signal, and a second output element having a fourth reference potential against a third reference potential of a second input signal, comprising:

• a first comparison circuit for comparing the first input signal having the first reference potential with a first reference voltage signal having a voltage value as a reference for comparison;
• a first input level shift circuit for converting the first input signal having the first reference potential, based on a result of comparison from said first comparison circuit, to a second signal corresponding to a substrate potential generated from the second reference potential and the third reference potential, thereby outputting the second signal;
• a first output level shift circuit for converting the second signal output from said first input level shift circuit to a third signal corresponding to a first output power supply voltage for said first output element, thereby outputting the third signal;
• a first signal amplification circuit for amplifying the third signal output from said first output level shift circuit, thereby outputting a drive signal for driving said first output element;
• a second comparison circuit for comparing the second input signal having the first reference potential with a second reference voltage signal having a voltage value as a reference for comparison;
• a second input level shift circuit for converting the second input signal having the first reference potential, based on a result of comparison from said second comparison circuit, to a fourth signal corresponding to the substrate potential, thereby outputting the fourth signal;
• a second output level shift circuit for converting the fourth signal output from said second input level shift circuit to a fifth signal corresponding to a second power supply voltage for said second output element, thereby outputting the fifth signal;
• and
• a second signal amplification circuit for amplifying the fifth signal output from said second output level shift circuit, thereby outputting a drive signal for driving said second output element.

A display device, comprising:

• plural electrodes for applying voltages in display cells;
• plural output elements for supplying voltages, which change for each of said electrodes;
• a drive control circuit for outputting a control signal which has a first reference potential;
• and
• plural predrive circuits comprising a comparison circuit for comparing the control signal having a first reference potential with the reference voltage signal having a voltage value as a reference for comparison when the first reference potential is different from second reference potentials of said output elements, an input level shift circuit for converting the control signal having the first reference potential, based on a result of comparison from said comparison circuit, to a second signal corresponding to a substrate potential generated from the second reference potential, thereby outputting the second signal, an output level shift circuit for converting the second signal output from said input level shift circuit to a third signal corresponding to an output power supply voltage, thereby outputting the third signal, a signal amplification circuit for amplifying the third signal output from said output level shift circuit, thereby outputting signals for driving said output elements.

A display device, comprising:

• a sustain circuit comprising a first output element for outputting a sustain pulse of positive voltage, and a second output element for outputting a sustain pulse of negative voltage;
• a drive control circuit for outputting a control signal which has a first reference potential;
• and
• plural predrive circuits comprising a comparison circuit for comparing the control signal having the first reference potential with the reference voltage signal having a voltage value as a reference for comparison when the first reference potential is different from second reference potentials of said first output element and said second output element, an input level shift circuit for converting the control signal having the first reference potential, based on a result of comparison from said comparison circuit, to a second signal corresponding to a substrate potential generated from the second reference potential, thereby outputting the second signal, an output level shift circuit for converting the second signal output from said input level shift circuit to a third signal corresponding to an output power supply voltage, thereby outputting the third signal, a signal amplification circuit for amplifying the third signal output from said output level shift circuit, thereby outputting signals for driving said first output element and said second output element.

A display device for driving plural electrodes as capacitive loads to apply voltages in display cells, comprising:

• a first switch whose one terminal is connected to a power supply voltage, which changes from positive voltage to negative voltage;
• a second switch connecting said first switch to ground;
• a third switch connecting a point of interface between said first switch and said second switch to said capacitive load;
• a fourth switch whose one terminal is connected to ground;
• a fifth switch connecting another terminal of said fourth switch to said capacitive load;
• a drive control circuit for outputting a control signal which has a first reference potential;
• and
• plural predrive circuits comprising a comparison circuit for comparing the control signal having the first reference potential with a reference voltage signal having a voltage value as a reference for comparison, in a state that said third switch and said fifth switch are configured by field effect transistors, when the first reference potential is different from second reference potentials of said third switch and said fifth switch, an input level shift circuit for converting the control signal having the first reference potential, based on a result of comparison from said comparison circuit, to a second signal corresponding to a substrate potential generated from the second reference potential, thereby outputting the second signal, an output level shift circuit for converting the second signal output from said input level shift circuit to a third signal corresponding to an output power supply voltage, thereby outputting the third signal, a signal amplification circuit for amplifying the third signal output from said output level shift circuit, thereby outputting signals for driving said third switch and said fifth switch.