Back to results
US 2015/0091618 A1Published application
Sample and hold circuit and source driver including the same
AssigneeSilicon Works Co., Ltd.
InventorsKyung Jik MIN, Hyun Kyu Jeon, Yong Ik Jung, Hyun Ho Cho, Young Bok Kim
Life of this patent
Estimating the term…
Abstract
A sample and hold circuit may include: a main sample and hold circuit configured to sample and hold pixel information of an organic light emitting diode (OLED) cell, and output a first output signal; and a dummy sample and hold circuit configured to sample and hold a reference voltage in synchronization with the main sample and hold circuit, and output a second output signal for offsetting a switching noise signal contained in the first output signal.
Claims19
A sample and hold circuit comprising:
- a main sample and hold circuit configured to sample and hold pixel information of an organic light emitting diode (OLED) cell, and output a first output signal;
- and
- a dummy sample and hold circuit configured to sample and hold a reference voltage in synchronization with the main sample and hold circuit, and output a second output signal for offsetting a switching noise signal contained in the first output signal.
A sample and hold circuit comprising:
- a main sample and hold circuit comprising:
- a first main switching element configured to transmit pixel information of an OLED cell;
- a main sampling capacitor configured to sample the pixel information transmitted from the first main switching element;
- a second main switching element configured to transmit the pixel information sampled by the main sampling capacitor;
- a main charge sharing unit configured to hold the sampled pixel information;
- and a third main switching element configured to output the pixel information held in the main charge sharing unit as a first output signal;
- a dummy sample and hold circuit comprising:
- a first dummy switching element configured to transmit a reference voltage;
- a dummy sampling capacitor configured to sample the reference voltage transmitted from the first dummy switching element;
- a second dummy switching element configured to transmit the reference voltage sampled by the dummy sampling capacitor;
- a dummy charge sharing unit configured to hold the sampled reference voltage;
- and a third dummy switching element configured to output the reference voltage held in the dummy charge sharing unit as a second output signal;
- and
- a common coupling unit configured to couple the main sampling capacitor and the dummy sampling capacitor and couple the main charge sharing unit and the dummy charge sharing unit.
11 more elements
A source driver comprising:
- a sample and hold circuit comprising:
- a main sample and hold circuit configured to sample and hold pixel information of an OLED cell and output a first output signal;
- and a dummy sample and hold circuit configured to sample and hold a reference voltage in synchronization with the main sample and hold circuit and output a second output signal for offsetting a switching noise signal contained in the first output signal;
- and
- an amplifier configured to receive the first and second output signals, and differentially amplify the first and second output signals so as to offset the switching noise signal contained in the first output signal.
2 more elements
Dependencies are inferred from the claim text.