Display apparatus, driving method thereof and electronic equipment including a drive circuit selectively driving scan lines and capacitor lines

A display apparatus comprising:

• an effective pixel section having a plurality of pixel circuits arranged to form a matrix, each pixel circuit including a switching device through which pixel video data is written into said pixel circuit;
• a plurality of scan lines respectively provided for individual rows of said pixel circuits arranged on said effective pixel section to control the conduction states of said switching devices;
• a plurality of capacitor lines respectively arranged for the individual rows of said pixel circuits;
• a plurality of signal lines respectively arranged for individual columns of said pixel circuits to propagate said pixel video data;
• a first driving circuit configured to selectively drive said scan lines and said capacitor lines;
• a second driving circuit configured to drive said signal lines,
• wherein said second driving circuit includes a voltage driving circuit having a voltage boosting function for carrying out a voltage boosting operation to boost an input voltage having a level with a dynamic range insufficient for a gradation expression,
• said voltage driving circuit outputs a voltage obtained as a result of said voltage boosting operation or an unboosted voltage as a signal to one of said signal lines, and
• said voltage driving circuit has a select function for disabling said voltage boosting function for only a set of gradations determined in advance and implementing said voltage boosting function to boost said input voltage to an output voltage according to the level of said input voltage for gradations other than said set of gradations determined in advance;
• a monitor circuit configured to detect an electric potential found as a midpoint of detected electric potentials appearing on positive-polarity and negative-polarity monitor pixels provided besides said effective pixel section, and corrects the center value of a common voltage signal with a level changing at predetermined time intervals on the basis of said detected potential midpoint, wherein
• each of said pixel circuits arranged in said effective pixel section includes
• a display element having a first pixel electrode as well as a second pixel electrode, and
• a storage capacitor having a first electrode as well as a second electrode,
• in each of said pixel circuits, said first pixel electrode of said display element and said first electrode of said storage capacitor are connected to one terminal of said switching device;
• in each of said pixel circuits, said second electrode of said storage capacitor is connected to said capacitor line provided for said individual row;
• and
• said common voltage with a level changing at time intervals determined in advance is supplied to said second pixel electrode of each of said display elements.

A method for driving a display apparatus, said display apparatus including an effective pixel section having a plurality of pixel circuits arranged to form a matrix, each pixel circuit including a switching device through which pixel video data is written into said pixel circuit;

• a plurality of scan lines respectively provided for individual rows of said pixel circuits arranged on said effective pixel section to control the conduction states of said switching devices;
• a plurality of capacitor lines respectively arranged for the individual rows of said pixel circuits;
• a plurality of signal lines respectively arranged for individual columns of said pixel circuits to propagate said pixel video data;
• a first driving circuit configured to selectively drive said scan lines and said capacitor lines;
• and a second driving circuit configured to drive said signal lines, the method comprising:
• sending, in an operation to output a signal with a level according to a gradation expression to one of said signal lines, an input voltage having a level with a dynamic range insufficient for said gradation expression to said second driving circuit;
• disabling a voltage boosting function for only a set of gradations determined in advance;
• and
• boosting said input voltage to an output voltage according to the level of said input voltage for gradations other than said set of gradations determined in advance;
• wherein said disabling and said boosting is carried out for a black side with large voltage variations by setting a gradation zero as the set of gradations determined in advance, such that the voltage boosting operation is disabled only for the gradation zero.

An electronic equipment comprising

• a display apparatus including:
• an effective pixel section having a plurality of pixel circuits arranged to form a matrix, each pixel circuit including a switching device through which pixel video data is written into said pixel circuit;
• a plurality of scan lines respectively provided for individual rows of said pixel circuits arranged on said effective pixel section to control the conduction states of said switching devices;
• a plurality of capacitor lines respectively arranged for the individual rows of said pixel circuits;
• a plurality of signal lines respectively arranged for columns of said pixel circuits to propagate said pixel video data;
• a first driving circuit configured to selectively drive said scan lines and said capacitor lines;
• and
• a second driving circuit configured to drive said signal lines,
• wherein said second driving circuit includes a voltage driving circuit having a voltage boosting function for carrying out a voltage boosting operation to boost an input voltage having a level with a dynamic range insufficient for a gradation expression,
• said voltage driving circuit outputs a voltage obtained as a result of said voltage boosting operation or an unboosted voltage as a signal to one of said signal lines, and
• said voltage driving circuit has a select function for disabling said voltage boosting function for only a set of gradations determined in advance and implementing said voltage boosting function to boost said input voltage to an output voltage according to the level of said input voltage for gradations other than said set of gradations determined in advance,
• wherein the voltage driving circuit boosts only a black side with large voltage variations by setting a gradation zero as the set of gradations determined in advance, such that the voltage driving circuit disables the voltage boosting operation only for the gradation zero.

A method for driving a display apparatus, said display apparatus including an effective pixel section having a plurality of pixel circuits arranged to form a matrix, each pixel circuit including a switching device through which pixel video data is written into said pixel circuit;

• a plurality of scan lines respectively provided for individual rows of said pixel circuits arranged on said effective pixel section to control the conduction states of said switching devices;
• a plurality of capacitor lines respectively arranged for the individual rows of said pixel circuits;
• a plurality of signal lines respectively arranged for individual columns of said pixel circuits to propagate said pixel video data a first driving circuit configured to selectively drive said scan lines and said capacitor lines;
• and a second driving circuit configured to drive said signal lines, the method comprising:
• sending, in an operation to output a signal with a level according to a gradation expression to one of said signal lines, an input voltage having a level with a dynamic range insufficient for said gradation expression to said second driving circuit;
• disabling a voltage boosting function for only a set of gradations determined in advance;
• boosting said input voltage to an output voltage according to the level of said input voltage for gradations other than said set of gradations determined in advance;
• and
• detecting, by a monitor circuit, an electric potential found as a midpoint of detected electric potentials appearing on positive-polarity and negative-polarity monitor pixels provided besides said effective pixel section, and
• correcting the center value of a common voltage signal with a level changing at predetermined time intervals on the basis of said detected potential midpoint, wherein
• each of said pixel circuits arranged in said effective pixel section includes
• a display element having a first pixel electrode as well as a second pixel electrode, and
• a storage capacitor having a first electrode as well as a second electrode,
• in each of said pixel circuits, said first pixel electrode of said display element and said first electrode of said storage capacitor are connected to one terminal of said switching device;
• in each of said pixel circuits, said second electrode of said storage capacitor is connected to said capacitor line provided for said individual row;
• and
• said common voltage with a level changing at time intervals determined in advance is supplied to said second pixel electrode of each of said display elements.

An electronic equipment comprising:

• a display apparatus including:
• an effective pixel section having a plurality of pixel circuits arranged to form a matrix, each pixel circuit including a switching device through which pixel video data is written into said pixel circuit;
• a plurality of scan lines respectively provided for individual rows of said pixel circuits arranged on said effective pixel section to control the conduction states of said switching devices;
• a plurality of capacitor lines respectively arranged for the individual rows of said pixel circuits;
• a plurality of signal lines respectively arranged for columns of said pixel circuits to propagate said pixel video data;
• a first driving circuit configured to selectively drive said scan lines and said capacitor lines;
• a second driving circuit configured to drive said signal lines,
• wherein said second driving circuit includes a voltage driving circuit having a voltage boosting function for carrying out a voltage boosting operation to boost an input voltage having a level with a dynamic range insufficient for a gradation expression,
• said voltage driving circuit outputs a voltage obtained as a result of said voltage boosting operation or an unboosted voltage as a signal to one of said signal lines, and
• said voltage driving circuit has a select function for disabling said voltage boosting function for only a set of gradations determined in advance and implementing said voltage boosting function to boost said input voltage to an output voltage according to the level of said input voltage for gradations other than said set of gradations determined in advance;
• a monitor circuit configured to detect an electric potential found as a midpoint of detected electric potentials appearing on positive-polarity and negative-polarity monitor pixels provided besides said effective pixel section, and corrects the center value of a common voltage signal with a level changing at predetermined time intervals on the basis of said detected potential midpoint, wherein
• each of said pixel circuits arranged in said effective pixel section includes
• a display element having a first pixel electrode as well as a second pixel electrode, and
• a storage capacitor having a first electrode as well as a second electrode,
• in each of said pixel circuits, said first pixel electrode of said display element and said first electrode of said storage capacitor are connected to one terminal of said switching device;
• in each of said pixel circuits, said second electrode of said storage capacitor is connected to said capacitor line provided for said individual row;
• and
• said common voltage with a level changing at time intervals determined in advance is supplied to said second pixel electrode of each of said display elements.