Scanning drive circuit and display device including the same
AssigneeSony Corporation
InventorsTakao Tanikame, Seiichiro Jinta
Life of this patent
Estimating the term…
Abstract
A display device includes display elements two-dimensionally disposed in a matrix; scanning lines, initialization control lines, and display control lines extending in a first direction; data lines extending in a second direction different from the first direction; and a scanning drive circuit. The scanning drive circuit generates signals based on an input pulse, at least some of the generated signals controlling the display state of the display elements via the display control lines. The duration of the display state of the display elements may be variably changed by changing the width of the input pulse.
Claims19
A display device, comprising:
- a plurality of drive circuits disposed in a matrix form;
- a plurality of display control lines, each connected to at least one of the plurality of drive circuits;
- and
- a plurality of shift registers being configured to shift an input pulse inputted thereto, and to thereby output a plurality of output signals,
- wherein each of the plurality of drive circuits includes a write transistor, a drive transistor, a first switching transistor, a capacitor portion, and a light emitting portion, such that in each of the plurality of drive circuits:
- the write transistor is configured to supply a data potential to the capacitor portion via the write transistor and the drive transistor,
- the drive transistor is configured to supply a drive current from a voltage line to the light emitting portion via the drive transistor and the first switching transistor, the magnitude of the drive current corresponding to the data potential,
- the first switching transistor is configured to switch between a display state and a non-display state according to one of the plurality of output signals,
- the respective first switching transistors of the plurality of drive circuits switch between the display state and the non-display state in a line-sequential manner, and
- a duration of the display state of the first switching transistor of each of the plurality of drive circuits is variably controlled by changing a width of the input pulse.
A display device for displaying image frames based on an input video signal, comprising:
- drive circuits disposed in a matrix form, each including a light emitting portion, a drive transistor that supplies a drive current from a voltage line to the light emitting portion, and a first switching transistor that is interposed in a current path between the voltage line and the light emitting portion such that an operation state of the first switching transistor controls whether the drive current is supplied to the light emitting element;
- display control lines, each connected to a control terminal of the first switching transistor of at least one of the drive circuits;
- and
- a driving control circuit that includes a plurality of shift registers that each shift an input pulse inputted thereto and thereby output an output signal, each output signal of the plurality of shift registers being supplied to a corresponding display control line and controlling the operating state of any of the first switching transistors that are connected to the corresponding display control line,
- wherein the plurality of shift registers are configured to generate the output signals such that ON pulses are line-sequentially supplied to the display control lines, the ON pulses placing those first switching transistors that are connected to the corresponding display control line in an ON operation state, and
- wherein the driving control circuit is configured to variably control, from frame to frame, a duration of light emission of each of the drive circuits by variably controlling a width of the input pulse that is inputted to a first-stage shift register of the plurality of shift registers.
Dependencies are inferred from the claim text.