Display apparatus
First Claim
1. An electroluminescent apparatus comprising:
- a scanning line;
a data line;
a common power supply line;
a capacitor line; and
a pixel corresponding to intersection of the scanning line and the data line, the pixel including;
a pixel electrode;
a luminescent element driven by a current flowing between the pixel electrode and an opposite electrode opposed to the pixel electrode;
a first transistor having a first gate electrode which is coupled to a corresponding scanning line;
a second transistor having a second gate electrode; and
a holding capacitor holding, as a charge, a signal supplied through the data line and the first transistor, the holding capacitor including a first electrode and a second electrode opposed to the first electrode, the first electrode being coupled to the second gate electrode and the second electrode being coupled to the capacitor line, the charge held by the holding capacitor controlling resistance of the second transistor, and the resistance of the second transistor determining current that flows through the second transistor between the common power supply line and the pixel electrode.
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Accused Products
Abstract
A display apparatus, that includes current driving type luminescent elements, has a driving system that takes the conduction types of TFTs to control the emission of the luminescent elements into consideration. In order to reduce driving voltage and improve display quality simultaneously, the arrangement is provided such that if the second TFT which performs the “on-off” function of the current for the luminescent element is of an N channel type, the potential of the common power supply line (“com”) is lowered below the potential of the opposite electrode (“op”) of the luminescent element to obtain a higher gate voltage (“Vgcur”). In this case, if the first TFT connected to the gate of the second TFT is of a P channel type, when using the potential of the potential-holding electrode (“st”) at the “on” state as a reference, potentials of the scanning signal (“Sgate”) at the lower potential and the common power supply line (“com”) are rendered of the same polarities with respect to this potential of the potential-holding electrode (“st”). Therefore, the potential of the image signal (“data”) to turn “on” can be shifted within the range of the driving voltage in the display apparatus in the direction to reduce resistances at the “on” states of the first TFT and the second TFT to reduce driving voltage and improve display quality.
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Citations
6 Claims
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1. An electroluminescent apparatus comprising:
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a scanning line;
a data line;
a common power supply line;
a capacitor line; and
a pixel corresponding to intersection of the scanning line and the data line, the pixel including;
a pixel electrode;
a luminescent element driven by a current flowing between the pixel electrode and an opposite electrode opposed to the pixel electrode;
a first transistor having a first gate electrode which is coupled to a corresponding scanning line;
a second transistor having a second gate electrode; and
a holding capacitor holding, as a charge, a signal supplied through the data line and the first transistor, the holding capacitor including a first electrode and a second electrode opposed to the first electrode, the first electrode being coupled to the second gate electrode and the second electrode being coupled to the capacitor line, the charge held by the holding capacitor controlling resistance of the second transistor, and the resistance of the second transistor determining current that flows through the second transistor between the common power supply line and the pixel electrode. - View Dependent Claims (2, 3, 4, 5)
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6. An electroluminescent apparatus comprising:
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a plurality of scanning lines;
a plurality of data lines;
a plurality of common power supply lines; and
a plurality of pixels corresponding to intersections of the plurality of scanning lines and the plurality of data lines, each pixel of the plurality of pixels including;
a pixel electrode;
a luminescent element driven by a current flowing between the pixel electrode and an opposite electrode opposed to the pixel electrode;
a first transistor having a first gate electrode which is coupled to a corresponding scanning line of the plurality of scanning lines;
a second transistor having a second gate electrode; and
a hold capacitor holding, as a charge, a signal supplied through the data line and the first transistor, the holding capacitor including a first electrode and a second electrode opposed to the first electrode, the first electrode being coupled to the second gate electrode and second electrode being coupled to a different scanning line from the corresponding scanning line of the plurality of scanning lines, the charge held by the holding capacitor controlling resistance of the second transistor, and the resistance of the second transistor determining current that flows through the second transistor between the common power supply line and the pixel electrode.
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Specification