Light emitting display
AssigneeSamsung Display Co., Ltd.
InventorsSung-Cheon Park, Choon-Yul Oh
Life of this patent
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Abstract
A light emitting display includes: a pixel portion including a plurality of pixels; a scan driver adapted to supply a scan signal to scan lines connected to the pixels; a DC/DC converter adapted to supply a first voltage and a second voltage to the plurality of pixels; and a synchronizer adapted to maintain a ripple voltage of the first voltage at a predetermined level when the scan signals are converted into a turn off voltage. With this configuration, since the ripple voltage of the first voltage is always kept constant when the scan signal is turned off, a uniform brightness in a horizontal line and a frame can be displayed.
Claims16
A light emitting display comprising:
- a pixel portion including a plurality of pixels;
- a scan driver adapted to supply a scan signal to scan lines connected to the pixels;
- a DC/DC converter adapted to supply a first voltage and a second voltage to the plurality of pixels;
- and
- a synchronizer adapted to maintain a ripple voltage of the first voltage at a predetermined level when the scan signals are converted into a turn off voltage.
A DC/DC converter comprising:
- an oscillator adapted to generate a pulse signal having a predetermined frequency;
- a synchronizer adapted to synchronize the pulse signal with an externally supplied scan signal;
- a switching controller adapted to alternately turn on and turn off the first switching device and the second switching device in response to the pulse signal synchronized by the synchronizer;
- a first voltage generator adapted to generate a first voltage corresponding to a turn on and turn off period of the first switching device;
- and
- a second voltage generator adapted to generate a second voltage corresponding to a turn on and turn off period of the second switching device.
A method of driving a light emitting display, the method comprising:
- connecting a plurality of pixels to a scan line to receive a scan signal;
- connecting the plurality of pixels to a data line to receive a data signal;
- generating a first pulse signal having a predetermined frequency;
- generating a second pulse signal by synchronizing the first pulse signal with the scan signal;
- generating a first voltage and a second voltage using the second pulse signal;
- and
- supplying the first voltage and the second voltage to the plurality of pixels.
Dependencies are inferred from the claim text.