Output buffer circuit for display driving apparatus
AssigneeSilicon Works Co., Ltd.
InventorsYoung Bok Kim, Taiming Piao, Young Tae Kim, Young Ho Shin
Life of this patent
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Abstract
Disclosed is an output buffer circuit for a display driving apparatus, which generates an output voltage by using a bias current controlled by digital-to-analog conversion for interpolation data, the output buffer circuit including a decoder configured to output control data obtained by decoding interpolation data, and an output circuit configured to output an output voltage by using a bias current having the amount of current controlled by digital-to-analog conversion for the control data.
Claims15
An output buffer circuit for a display driving apparatus, comprising:
- a decoder configured to receive interpolation data and output control data obtained by decoding the interpolation data;
- an input stage configured to receive a high input voltage, a low input voltage, a feedback output voltage and the control data, output a positive current and a first feedback current in accordance with one of a first input group comprising the high input voltage and the feedback output voltage and a second input group comprising the low input voltage and the feedback output voltage, and output a negative current and a second feedback current in accordance with the other of the first input group and the second input group;
- and
- an output stage configured to output an output voltage having a level determined by pull-up based on the positive current and the first feedback current and pull-down based on the negative current and the second feedback current,
- wherein the output voltage corresponds to the feedback output voltage, and
- the input stage controls a bias current so that the bias current has an amount of current non-linearly varying in response to a change in a value of the control data, and outputs the positive current, the first feedback current, the negative current and the second feedback current by using the bias current.
An output buffer circuit for a display driving apparatus, comprising:
- a decoder configured to receive interpolation data and output control data obtained by decoding the interpolation data;
- and
- an output circuit configured to generate a bias current having an amount of current non-linearly varying in response to a change in a value of the control data by digital-to-analog conversion for the control data, generate a positive current, a first feedback current, a negative current and a second feedback current corresponding to a high input voltage, a low input voltage and a feedback output voltage by using the bias current, and output an output voltage having a level determined by pull-up based on the positive current and the first feedback current and pull-down based on the negative current and the second feedback current,
- wherein the output voltage corresponds to the feedback output voltage.
Dependencies are inferred from the claim text.