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US 8,619,069 B2Granted
Power-off discharge circuit, and source driver circuit having the same
AssigneeSamsung Electronics Co., Ltd.
InventorsJae-Hong Ko, Ho-Hak Rho, Do-Yoon Kim
Life of this patent
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Abstract
A power-off discharge circuit comprises a power voltage detection unit that detects whether a first power voltage for driving a source driver circuit is blocked and generates a discharge control signal, and a discharge unit that discharges a load circuit in a display panel based on the discharge control signal.
Claims16
A power-off discharge circuit of a source driver circuit of a display device, the power-off discharge circuit comprising:
- a power voltage detection unit which detects whether a first power voltage which drives a source driver circuit is blocked and generates a discharge control signal for discharging a load circuit in a display panel of the display device upon detection that the first power voltage is blocked;
- and
- a discharge unit which discharges the load circuit based on the discharge control signal by coupling the load circuit to substantially a ground voltage.
A source driver circuit, comprising:
- a decoder which decodes a digital data which indicates a gradation level to generate an analog gradation voltage corresponding to the digital data;
- an output buffer which amplifies the analog gradation voltage to output a source line driving voltage to a load circuit in a display panel of a display device;
- a switch which turns off when a first power voltage which drives the source driver circuit is blocked, and turns on when the first power voltage is supplied;
- and
- a power-off discharge circuit which discharges the load circuit when the first power voltage is blocked by coupling the load circuit to substantially a ground voltage, and which does not discharge the load circuit when the first power voltage is supplied.
2 more elements
Dependencies are inferred from the claim text.