Display driving device, source driver, and display device including thereof
AssigneeSamsung Electronics Co., Ltd.
InventorsDonghan Lee, Jinwoo Kim
Life of this patent
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Abstract
An example display driving device includes a level shifter and a digital-analog converter (DAC). The level shifter is configured to receive image data and a bias control signal, to generate decoded image data including a plurality of bits by level shifting the image data, and to control an output bias current of the decoded image data based on the bias control signal. The DAC is configured to receive the decoded image data and a plurality of gamma voltages, to select one gamma voltage of the plurality of gamma voltages based on the decoded image data, and to output the selected gamma voltage.
Claims19
A display driving device comprising:
- a level shifter configured to
- receive image data and a bias control signal,
- level-shift the image data to generate decoded image data, the decoded image data including a plurality of bits, the plurality of bits including an uppermost bit, and
- control at least one output bias current of at least one bit of the plurality of bits excluding the uppermost bit of the decoded image data based on the bias control signal;
- and
- a digital-to-analog converter (DAC) configured to
- receive the decoded image data and a plurality of gamma voltages,
- select one gamma voltage of the plurality of gamma voltages based on the decoded image data, and
- output the selected gamma voltage.
A source driver comprising:
- a plurality of amplifier areas, each amplifier area of the plurality of amplifier areas including
- a level shifter configured to level-shift at least one bit of a plurality of bits of an image data to generate a decoded image data and output a plurality of bits of the decoded image data, the at least one bit being among the plurality of bits excluding an uppermost bit of the plurality of bits,
- a digital-to-analog converter (DAC) configured to select one gamma voltage of a plurality of gamma voltages based on the decoded image data, and
- an amplifier configured to amplify the selected gamma voltage to obtain a data signal and to output the data signal to a corresponding source line among a plurality of source lines;
- and
- a bias circuit configured to generate a bias control signal that is configured to limit an output bias current of the level shifter included in each of the plurality of amplifier areas.
A display device comprising:
- a pixel array including a plurality of pixels;
- a timing controller configured to
- receive an image signal and a driving control signal from an outside of the display device,
- divide the image signal to generate a plurality of image data, and
- generate a bias start signal based on the driving control signal;
- a plurality of amplifier areas configured to
- receive one image data of the plurality of image data and a bias control signal,
- level-shift at least one bit of a plurality of bits of the image data to generate decoded image data, the at least one bit being among the plurality of bits excluding an uppermost bit of the plurality of bits,
- control a level of an output bias current of the decoded image data based on a level of the bias control signal,
- receive the decoded image data and a plurality of gamma voltages,
- select one gamma voltage of the plurality of gamma voltages based on the decoded image data, and
- output the selected gamma voltage;
- and
- a bias circuit configured to
- receive a bias start signal that is configured to control the bias control signal to be outputted at a first level, and
- generate the bias control signal at a second level that is different from the first level with reference to data stored in a one-time programmable (OTP) memory.
Dependencies are inferred from the claim text.