Display device

A display device comprising:

• a display panel having a drive circuit;
• and
• a power source circuit which supplies a drive voltage to the drive circuit, the power source circuit comprising:
• a drive voltage signal generation circuit which generates a drive voltage signal;
• an output transistor which has a control electrode to which the drive voltage signal generated by the drive voltage signal generation circuit is inputted, the output transistor outputting the drive voltage from a first electrode;
• a first transistor which is turned on when an overcurrent flows into the output transistor;
• and a second transistor which is turned on and turns off the output transistor when the first transistor is turned on, wherein
• assuming a period during which the overcurrent continuously flows into the output transistor as an overcurrent operation period and a period during which the output transistor is normally operated as a normal operation period,
• the first transistor and the second transistor are repeatedly turned on and off so as to make the output transistor intermittently operate within the overcurrent operation period, and
• the first transistor and the second transistor are turned off and the output transistor automatically returns to a normal operation when an operation period is shifted from the overcurrent operation period to the normal operation period which is the period during which the output transistor is normally operated.

A display device comprising:

• a display panel having a drive circuit;
• and
• a power source circuit which supplies a drive voltage to the drive circuit, the power source circuit comprising:
• a drive voltage signal generation circuit which generates a drive voltage signal;
• an output transistor which has a control electrode to which the drive voltage signal generated by the drive voltage signal generation circuit is inputted, the output transistor outputting the drive voltage from a first electrode;
• a first resistance element which is connected between a second electrode of the output transistor and a first power source line to which a first power source voltage is supplied;
• a first transistor which has a first electrode thereof connected to the first power source line and a control electrode thereof connected to the second electrode of the output transistor;
• a second resistance element which is connected between a second electrode of the first transistor and a second power source line to which a second power source voltage is supplied;
• and a second transistor which has a first electrode thereof connected to the second power source line, a second electrode thereof connected to the control electrode of the output transistor, and a control electrode thereof connected to the second electrode of the first transistor, wherein
• assuming a period during which the overcurrent continuously flows into the output transistor as an overcurrent operation period and a period during which the output transistor is normally operated as a normal operation period,
• the first transistor and the second transistor are repeatedly turned on and off so as to make the output transistor intermittently operate within the overcurrent operation period, and
• the first transistor and the second transistor are turned off and the output transistor automatically returns to a normal operation when an operation period is shifted from the overcurrent operation period to the normal operation period.