Patent ID: 11922897
Assignee: HKC CORPORATION LIMITED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  Y | IPC G

Claim 0:
1. A data driving circuit, configured to drive a display device to display different gray sc ale images and comprising:
a data signal processing (DSP) unit; and
a digital-to-analog conversion (DAC) unit electrically coupled with the DSP unit, the DAC unit comprising:
a voltage-dividing circuit comprising 2n voltage-dividing signal terminals arranged sequentially from low to high voltage;
a switching circuit comprising 2n switching sub-circuits, each of the 2 n switching sub-circuits comprising a receiving terminal, a first output terminal, and a second output terminal, receiving terminals of the 2n switching sub-circuits being electrically coupled to the 2n voltage-dividing signal terminals in one-to-one correspondence; and
a voltage selecting circuit comprising 2n selecting signal terminals, each of the 2n selecting signal terminals being electrically coupled with the first output terminal of one of the 2n switching sub-circuits and the second output terminal of one of the 2n switching sub-circuits, the voltage selecting circuit being configured to receive a data signal from the DSP unit, n being an integer greater than or equal to 2, wherein
the voltage-dividing signal terminal, the first output terminal of the switching sub-circuit, and the selecting signal terminal are conducted according to the data signal to output a first analog voltage; or, the voltage-dividing signal terminal, the second output terminal of the switching sub-circuit, and the selecting signal terminal are conducted according to the data signal to output a second analog voltage;
for a j-th switching sub-circuit, the receiving terminal is electrically coupled to a j-th voltage-dividing signal terminal, the first output terminal is electrically coupled to a j-th selecting signal terminal, the second output terminal is electrically coupled to a 2n-j-th selecting signal terminal, and the receiving terminal is selectively coupled with the first output terminal or the second output terminal, wherein j is an integer greater than or equal to 1 and less than 2n;
the j-th switching sub-circuit comprises a first transistor and a second transistor, the first transistor and the second transistor each comprise a control terminal, a first terminal, and a second terminal, the control terminal of the first transistor and the control terminal of the second transistor each are configured to receive an enable signal;
the first terminal of the first transistor and the first terminal of the second transistor are electrically coupled to the receiving terminal of the j-th switching sub-circuit; and
the second terminal of the first transistor is electrically coupled to the first output terminal of the j-th switching sub-circuit, and the second terminal of the second transistor is electrically coupled to the second output terminal of the j-th switching sub-circuit.