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US 8,941,629 B2Granted
Scan driver and organic light emitting display device using the same
AssigneeLG Display Co., Ltd.
InventorsHyemin Park, Sangho Yu, Hyunwook Kim
Life of this patent
Estimating the term…
Abstract
A scan driver for an organic light emitting display includes logic circuitry to receive a plurality of start pulses and either a first clock or a second clock that is an inversion of the first clock and to generate one or more pulse signals as scan signals for driving the sub-pixels of the organic light emitting display panel, where one or more of the pulse signals are delayed by ½ horizontal time from at least another one of the pulse signals.
Claims17
A scan driver for a display device, the scan driver comprising:
- clock selectors that output either a first clock or a second clock obtained by inverting the first clock in accordance with logic value of a selection signal, the first clock having a logic high period followed by a logic low period within one horizontal time, the horizontal time corresponding to a duration during which a scan signal is asserted for display of an image on the display device;
- and
- shift registers that generate pulse signals for driving sub-pixels of the display device in a given row, based on either the first clock or the second clock supplied from the clock selectors together with first to N-th start pulses of different phases where N is an integer equal to or greater than 4, one or more of the shift registers generating at least a first pulse signal for the given row based on a first start pulse responsive to the first clock and generating a second pulse signal for the given row offset by ½ horizontal time from the first pulse signal based on a second start pulse responsive to the second clock, the first pulse signal being asserted during a light-emitting period of the sub-pixels and the second pulse signal not being asserted during the light-emitting period of the sub-pixels.
An organic light emitting display comprising:
- an organic light emitting display panel;
- a data driver that supplies data signals to the display panel;
- and
- a scan driver,
- the scan driver comprising:
- clock selectors that output either a first clock or a second clock obtained by inverting the first clock in accordance with logic value of a selection signal, the first clock having a logic high period followed by a logic low period within one horizontal time, the horizontal time corresponding to a duration during which a scan signal is asserted for display of an image on the organic light emitting display, and
- shift registers that generate pulse signals for driving sub-pixels of the organic light emitting display in a given row, based on either the first clock or the second clock supplied from the clock selectors together with first to N-th start pulses of different phases where N is an integer equal to or greater than 4, one or more of the shift registers generating at least a first pulse signal for the given row based on a first start pulse responsive to the first clock and generating a second pulse signal for the given row offset by ½ horizontal time from the first pulse signal based on a second start pulse responsive to the second clock, the first pulse signal being asserted during a light-emitting period of the sub-pixels and the second pulse signal not being asserted during the light-emitting period of the sub-pixels.
4 more elements
An organic light emitting display comprising:
- an organic light emitting display panel including a plurality of sub-pixels;
- and
- a scan driver including logic circuitry to receive a plurality of start pulses including at least a first start pulse, first clock and a second clock that is an inversion of the first clock to generate two or more pulse signals as scan signals for driving the sub-pixels of the organic light emitting display panel in a given row, the logic circuitry generating a first pulse signal for the given row based on the first start pulse responsive to the first clock and generating a second pulse signal for the given row offset by ½ horizontal time from the first pulse signal based on the second start pulse responsive to the second clock, the first pulse signal being asserted during a light-emitting period of the sub-pixels and the second pulse signal not being asserted during the light-emitting period of the sub-pixels, the horizontal time corresponding to a duration during which the scan signals are asserted for display of an image on the organic light emitting display.
Dependencies are inferred from the claim text.