Display apparatus and driving method for display apparatus
View Patent ↗The present invention provides a display apparatus, including: a display section including a plurality of pixels disposed in a matrix and a plurality of signal lines and a plurality of scanning lines; and a horizontal driving circuit and a vertical driving circuit configured to drive the signal lines and the scanning lines of the display section to display an image on the display section; each of the pixels including a light emitting device; a signal level storage capacitor, a writing transistor, and a driving transistor.
1. A display apparatus, comprising:
a display section including a plurality of pixels disposed in a matrix;
a driving section to control said display section to display an image;
each of said pixels including:
a light emitting device,
a signal level storage capacitor,
a writing transistor to write a signal to the signal level storage capacitor, and
a driving transistor to drive said light emitting device in response to a voltage stored in the signal level storage capacitor,
wherein said driving section being operable:
within a first period, to write a halftone voltage signal corresponding to a halftone of said light emitting device to said signal level storage capacitor, and to turn on said driving transistor to charge said signal level storage capacitor,
within a second period after the first period, to write a fixed voltage signal to said signal level storage capacitor, and to turn off said driving transistor, and
within a third period after the second period, to write a gradation voltage signal corresponding to an image signal, and to turn on said driving transistor to charge said signal level storage capacitor; and
signal lines connected to the pixels, wherein said driving section drives signal lines time-divisionally,
wherein the time-divisional driving is a process of setting the halftone voltage or the fixed voltage simultaneously to the signal level storage capacitors of the pixels of a gradation setting object connected to said signal lines, and setting said signal lines successively to the gradation voltages of the pixels of the gradation setting object to hold the gradation voltage by a capacitance of said signal lines and then setting the gradation voltage held in said signal lines to the signal level storage capacitors of the pixels of the gradation setting object.
2. A display apparatus, comprising:
a display section including a plurality of pixels disposed in a matrix; and
a driving section to control said display section to display an image;
each of said pixels including:
a light emitting device,
a signal level storage capacitor,
a writing transistor to write a signal to the signal level storage capacitor, and
a driving transistor to drive said light emitting device in response to a voltage stored in the signal level storage capacitor;
wherein an emission luminance of the light emitting device has a dependence on a mobility of drive transistor,
within a first period, the mobility dependence correction is operated with a halftone voltage signal corresponding to a halftone of said light emitting device,
within a second period after the first period off said driving transistor is turned off, and
within a third period the mobility dependence correction is operated with the gradation voltage signal corresponding to an image signal,
wherein said driving section drives signal lines time-divisionally, and
wherein the time-divisional driving is a process of setting the halftone voltage or the fixed voltage simultaneously to the signal level storage capacitors of the pixels of a gradation setting object connected to said signal lines, and setting said signal lines successively to the gradation voltages of the pixels of the gradation setting object to hold the gradation voltage by a capacitance of said signal lines and then setting the gradation voltage held in said signal lines to the signal level storage capacitors of the pixels of the gradation setting object.
3. The display apparatus according to claim 1 wherein:
an emission luminance of the light emitting device has a dependence on a mobility of the drive transistor,
within the first period, a mobility dependence correction is carried out with the halftone voltage signal corresponding to a halftone of said light emitting device,
and within the third period the mobility dependence correction is carried out with the gradation voltage signal corresponding to the image signal.
4. The display apparatus according to claim 1 wherein:
wherein said driving section being operable:
within the first period, to set a gate of the driving transistor to a potential according to the halftone voltage signal whereby a current is extracted from the drive transistor and is fed back to the signal level storage capacitor,
within the second period, to set the gate of the driving transistor to a potential according the fixed voltage signal whereby said driving transistor is turned off;
and within the third period, to set the gate of the driving transistor to a potential according to the gradation voltage signal whereby a current is extracted from the drive transistor and is fed back to the signal level storage capacitor.
5. The display apparatus according to claim 1 , wherein said driving section connects said signal lines to the fixed voltage or the halftone voltage through respective switch circuits to set the fixed voltage or the halftone voltage to the signal level storage capacitors of the pixels.