Patent ID: 11955068
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 10:
11. A gamma driving voltage generating circuit, comprising:
a gamma standard high voltage generating circuit;
a gamma standard low voltage generating circuit;
a gamma driving voltage element electrically coupled between an output terminal of a selecting element of the gamma standard high voltage generating circuit and an output terminal of a selecting element of the gamma standard low voltage generating circuit, and configured to generate a gamma driving voltage according to a gamma standard high voltage and a gamma standard low voltage; wherein
the gamma standard high voltage generating circuit and/or the gamma standard low voltage generating circuit is a gamma standard voltage generating circuit , the gamma standard voltage generating circuit comprises: a constant voltage element configured to output a constant voltage; a following voltage element electrically coupled to a driving voltage terminal and configured to output a following voltage changing with a driving voltage of the driving voltage terminal; a selecting element electrically coupled to an output terminal of the constant voltage element and an output terminal of the following voltage element, and configured to output the following voltage or the constant voltage as an output voltage at an output terminal thereof, the output voltage is a gamma standard voltage for generating gamma driving voltages at gray levels by performing voltage divisions thereon; a comparison element electrically coupled to the output terminal of the selecting element, and configured to control the selecting element to output the following voltage in response to that the output voltage meets a preset standard, and control the selecting element to output the constant voltage in response to that the output voltage does not meet the preset standard; wherein the preset standard is one of: i) the output voltage is lower than a threshold voltage, or,ii) the output voltage is higher than the threshold voltage; and
the constant voltage is one of i) higher than or equal to the threshold voltage; or ii) lower than or equal to the threshold voltage, respectively, and wherein in the gamma standard high voltage generating circuit, the comparison element is configured to control the selecting element to output the following voltage in response to that the output voltage is lower than the threshold voltage and control the selecting element to output the constant voltage in response to that the output voltage is higher than or equal to the threshold voltage, and the following voltage is higher than the driving voltage, the constant voltage is higher than or equal to the threshold voltage, and the output voltage is a gamma standard high voltage; and
in the gamma standard low voltage generating circuit, the comparison element is configured to control the selecting element to output the following voltage in response to that the output voltage is higher than the threshold voltage and control the selecting element to output the constant voltage in response to that the output voltage is lower than or equal to the threshold voltage; and the following voltage is lower than the driving voltage, the constant voltage is lower than or equal to the threshold voltage, and the output voltage is a gamma standard low voltage.