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US 8,711,172 B2Granted
Dithering method and apparatus
AssigneeMagnaChip Semiconductor, Ltd.
InventorsCheon-Ho Bae, Jun-Hyoung Myoung
Life of this patent
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Abstract
A dithering method prevents the gray level saturation in a gray level region having high luminance and expresses all gray levels. The dithering method includes performing the temporal/spatial compensation on input data, generating dithering data by adding a head bit to the data on which the temporal/spatial compensation is performed, and selecting a corresponding gamma voltage according to the dithering data.
Claims35
A dithering method, comprising:
- performing the temporal/spatial compensation using a weight on input data in a manner of time-averaging during a plurality of frames;
- generating dithering data by adding a head bit for adjusting gamma voltage to the data on which the temporal/spatial compensation is performed;
- and
- selecting a corresponding gamma voltage according to the dithering data,
- wherein the head bit added to the data is a binary number ‘0’ in case a gray level of the input data is smaller than a first preset reference gray level;
- the head bit is a binary number ‘1’ in case the gray level of the input data exceeds a second preset reference gray level;
- the second preset reference gray level is greater than a (2N−7)th gray level where the input data has N bits.
4 more elements
A display device that performs dithering, comprising:
- a compensation sector configured to perform the temporal/spatial compensation using a weight according to a gray level of input data in a manner of time-averaging during a plurality of frames and output dithering data by adding a head bit for adjusting gamma voltage to the data on which the temporal/spatial compensation is performed;
- a gamma voltage generating sector configured to generate a plurality of main gamma voltages and a dummy gamma voltage;
- and
- a gamma voltage selecting sector configured to select the main gamma voltages or the dummy gamma voltage according to the dithering data,
- wherein the head bit added to the data is a binary number ‘0’ in case the gray level of the input data is smaller than a first preset reference gray level;
- the head bit added to the data is a binary number ‘1’ in case the gray level of the input data exceeds a second preset reference gray level;
- the second preset reference gray level is greater than the first preset reference gray level;
- the second preset reference gray level is greater than a (2N−7)th gray level where the input data has N bit.
5 more elements
A dithering method, comprising:
- performing the temporal/spatial compensation using a weight on input data in a manner of time-averaging during a plurality of frames;
- generating dithering data by adding a head bit for adjusting gamma voltage to the data on which the temporal/spatial compensation is performed;
- and
- selecting a corresponding gamma voltage according to the dithering data,
- wherein the gamma voltage comprises a plurality of main gamma voltages and a plurality of dummy gamma voltages that has different voltage levels from those of the main gamma voltages;
- and
- wherein, in case the input data has N bits and the higher bits are K bits, the number of the main gamma voltages is 2K, the main gamma voltages have voltage levels rising as going from 20th to 2Kth, and the dummy gamma voltages have voltage levels existing between a (2K−1)th main gamma voltage and the 2Kth main gamma voltage;
- and
- in case a gray level of the input data is a (2N−3)th gray level, the dummy gamma voltage is selected.
6 more elements
Dependencies are inferred from the claim text.