Offset compensating apparatus and method of digital/analog converter
AssigneeLG Electronics Inc.
InventorWoo-Yol Lee
Life of this patent
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Abstract
An offset compensating apparatus and method of a digital/analog converter that are capable of preventing an offset of a driving unit by switching an offset generated from an LCD panel driving unit of an LCD projection TV, by adding a current cell of the least significant bit, by adjusting and outputting a Vcom voltage of a buffer stage, or by including an offset compensating unit for changing a digital coding circuit.
Claims27
An offset compensating apparatus of a digital/analog converter wherein an offset generated from a driving unit in driving a panel of a projection TV is sampled and detected through an analog/digital converter and an offset compensation value corresponding to the detected offset is outputted to the driving unit.
An offset compensating apparatus of a digital/analog converter comprising:
- a current source for supplying a certain current;
- a comparator for comparing an input voltage added or subtracted as much as a voltage drop according to a current source and a reference voltage, and outputting a corresponding voltage level;
- a first expectation value voltage controller switched according to an output of the comparator and providing a path of the current source to control an expectation value voltage;
- and
- an offset removing unit for supplying a current through the first expectation value voltage controller to control the expectation value voltage and compensating an offset.
An offset compensating apparatus of a digital/analog converter comprising:
- a digital/analog converter for converting a digital input signal into an analog signal and outputting the analog signal;
- a buffer for dropping a certain bit of analog signal as much as a voltage drop according to the analog output signal;
- and
- an offset compensating unit for comparing an output voltage of the buffer and a reference voltage, and outputting the certain bit of analog signal according to the comparison result.
An offset compensating method of a digital/analog converter comprising the steps of:
- sampling an offset generated from a driving unit of a panel of a projection TV;
- digitalizing the sampled offset value;
- and
- calculating the digitalized offset value and compensating an offset value of a buffer unit of the driving unit.
An offset compensating method of a digital/analog converter comprising the steps of:
- sequentially connecting an output of a digital/analog converter to an output terminal of the certain number of buffers, and detecting a line error of a digital/analog converter on a dot of an LCD panel;
- and
- connecting an output of the corresponding line-error detected digital/analog converter to an input terminal of an adjacent buffer, and averaging an offset.
Dependencies are inferred from the claim text.