Voltage compensation circuit, source driver circuit, display, and voltage compensation method

1 . A display, comprising:

a voltage compensation circuit;

an organic light-emitting diode (OLED) display screen; and

a Gamma circuit;

wherein the voltage compensation circuit is configured to:

acquire a first power supply voltage on a power line at an end of the OLED display screen in a black frame insertion phase after the OLED display screen is turned on, and obtain a reference voltage based on the first power supply voltage;

acquire a second power supply voltage on the power line when each frame of picture is displayed, and adjust a pre-stored initial maximum Gamma voltage and a pre-stored initial minimum Gamma voltage based on a difference between the reference voltage and a currently obtained second power supply voltage, to obtain a target maximum Gamma voltage and a target minimum Gamma voltage; and

provide the obtained target maximum Gamma voltage and the obtained target minimum Gamma voltage to the Gamma circuit, for the Gamma circuit to perform Gamma curve adjustment based on the target maximum Gamma voltage and the target minimum Gamma voltage.

2 . The display according to claim 1 , wherein the voltage compensation circuit comprises a sampling circuit and a processing circuit;

wherein the sampling circuit is configured to:

acquire the first power supply voltage on the power line at the end of the OLED display screen at least once in the black frame insertion phase after the OLED display screen is turned on, convert the first power supply voltage acquired each time into a first digital signal, and send the first digital signal to the processing circuit; and

acquire the second power supply voltage on the power line at least once when each frame of picture is displayed, convert the second power supply voltage acquired each time into a second digital signal, and send the second digital signal to the processing circuit; and

wherein the processing circuit is configured to:

receive, in the black frame insertion phase, each first digital signal sent by the sampling circuit, obtain the reference voltage based on at least one received first digital signal, and store the reference voltage;

receive, when each frame of picture is displayed, each second digital signal sent by the sampling circuit, and adjust the pre-stored initial maximum Gamma voltage and the pre-stored initial minimum Gamma voltage based on a difference between a currently obtained second digital signal and the stored reference voltage, to obtain the target maximum Gamma voltage and the target minimum Gamma voltage; and

provide the obtained target maximum Gamma voltage and the obtained target minimum Gamma voltage to the Gamma circuit in the OLED display screen, for the Gamma circuit to perform Gamma curve adjustment based on a currently obtained target maximum Gamma voltage and a currently obtained target minimum Gamma voltage.

3 . The display according to claim 2 , wherein obtaining the reference voltage based on the at least one first digital signal comprises:

obtaining the reference voltage based on an average value of a plurality of received first digital signals.

4 . The display according to claim 2 , wherein adjusting the pre-stored initial maximum Gamma voltage and the pre-stored initial minimum Gamma voltage based on the difference between the currently obtained second digital signal and the stored reference voltage, to obtain the target maximum Gamma voltage and the target minimum Gamma voltage, comprises:

determining whether the difference between the currently obtained second digital signal and the stored reference voltage is greater than a threshold; and

based on the difference between the currently obtained second digital signal and the stored reference voltage being greater than the threshold, adjusting the pre-stored initial maximum Gamma voltage and the pre-stored initial minimum Gamma voltage separately based on the difference between the currently obtained second digital signal and the stored reference voltage, to obtain the target maximum Gamma voltage and the target minimum Gamma voltage.

5 . The display according to claim 4 , wherein the processing circuit is further configured to:

based on the difference between the currently obtained second digital signal and the stored reference voltage being less than or equal to the threshold, set the target maximum Gamma voltage to be equal to the pre-stored initial maximum Gamma voltage, and the target minimum Gamma voltage to be equal to the pre-stored initial minimum Gamma voltage.

6 . A source driver circuit, comprising:

a voltage compensation circuit; and

a Gamma circuit connected to the voltage compensation circuit;

wherein the voltage compensation circuit is configured to:

acquire a first power supply voltage on a power line at an end of an organic light-emitting diode (OLED) display screen in a black frame insertion phase after the OLED display screen is turned on, and obtain a reference voltage based on the first power supply voltage;

acquire a second power supply voltage on the power line when each frame of picture is displayed, and adjust a pre-stored initial maximum Gamma voltage and a pre-stored initial minimum Gamma voltage based on a difference between the reference voltage and a currently obtained second power supply voltage, to obtain a target maximum Gamma voltage and a target minimum Gamma voltage; and

provide the obtained target maximum Gamma voltage and the obtained target minimum Gamma voltage to the Gamma circuit, for the Gamma circuit to perform Gamma curve adjustment based on the target maximum Gamma voltage and the target minimum Gamma voltage.

7 . The source driver circuit according to claim 6 , wherein the voltage compensation circuit comprises a sampling circuit and a processing circuit;

wherein the sampling circuit is configured to:

acquire the first power supply voltage on the power line at the end of the OLED display screen at least once in the black frame insertion phase after the OLED display screen is turned on, convert the first power supply voltage acquired each time into a first digital signal, and send the first digital signal to the processing circuit; and

acquire the second power supply voltage on the power line at least once when each frame of picture is displayed, convert the second power supply voltage acquired each time into a second digital signal, and send the second digital signal to the processing circuit; and

wherein the processing circuit is configured to:

receive, in the black frame insertion phase, each first digital signal sent by the sampling circuit, obtain the reference voltage based on at least one received first digital signal, and store the reference voltage;

receive, when each frame of picture is displayed, each second digital signal sent by the sampling circuit, and adjust the pre-stored initial maximum Gamma voltage and the pre-stored initial minimum Gamma voltage based on a difference between a currently obtained second digital signal and the stored reference voltage, to obtain the target maximum Gamma voltage and the target minimum Gamma voltage; and

provide the obtained target maximum Gamma voltage and the obtained target minimum Gamma voltage to the Gamma circuit in the OLED display screen, for the Gamma circuit to perform Gamma curve adjustment based on the obtained target maximum Gamma voltage and the obtained target minimum Gamma voltage.

8 . The source driver circuit according to claim 7 , wherein obtaining the reference voltage based on the at least one first digital signal comprises:

obtaining the reference voltage based on an average value of a plurality of received first digital signals.

9 . The source driver circuit according to claim 7 , wherein adjusting the pre-stored initial maximum Gamma voltage and the pre-stored initial minimum Gamma voltage based on the difference between the currently obtained second digital signal and the stored reference voltage, to obtain the target maximum Gamma voltage and the target minimum Gamma voltage, comprises:

determining whether the difference between the currently obtained second digital signal and the stored reference voltage is greater than a threshold; and

based on the difference between the currently obtained second digital signal and the stored reference voltage being greater than the threshold, adjusting the pre-stored initial maximum Gamma voltage and the pre-stored initial minimum Gamma voltage separately based on the difference between the currently obtained second digital signal and the stored reference voltage, to obtain the target maximum Gamma voltage and the target minimum Gamma voltage.

10 . The source driver circuit according to claim 9 , wherein the processing circuit is further configured to:

based on the difference between the currently obtained second digital signal and the stored reference voltage being less than or equal to the threshold, set the target maximum Gamma voltage to be equal to the pre-stored initial maximum Gamma voltage, and the target minimum Gamma voltage to be equal to the pre-stored initial minimum Gamma voltage.

11 . A voltage compensation method, comprising:

acquiring, by a voltage compensation circuit, a first power supply voltage on a power line at an end of an organic light-emitting diode (OLED) display screen in a black frame insertion phase after the OLED display screen is turned on, and obtaining a reference voltage based on the first power supply voltage;

acquiring, by the voltage compensation circuit, a second power supply voltage on the power line when each frame of picture is displayed, and adjusting a pre-stored initial maximum Gamma voltage and a pre-stored initial minimum Gamma voltage based on a difference between the reference voltage and a currently obtained second power supply voltage, to obtain a target maximum Gamma voltage and a target minimum Gamma voltage; and

providing, by the voltage compensation circuit, the obtained target maximum Gamma voltage and the obtained target minimum Gamma voltage to a Gamma circuit, for the Gamma circuit to perform Gamma curve adjustment based on the target maximum Gamma voltage and the target minimum Gamma voltage.

12 . The voltage compensation method according to claim 11 , wherein acquiring the first power supply voltage on the power line at the end of the OLED display screen in the black frame insertion phase after the OLED display screen is turned on and obtaining the reference voltage based on the first power supply voltage comprises:

acquiring the first power supply voltage on the power line at the end of the OLED display screen at least once in the black frame insertion phase after the OLED display screen is turned on,

converting the first power supply voltage acquired each time into a first digital signal,

obtaining the reference voltage based on at least one first digital signal, and storing the reference voltage; and

wherein acquiring the second power supply voltage on the power line when each frame of picture is displayed and adjusting the pre-stored initial maximum Gamma voltage and the pre-stored initial minimum Gamma voltage based on the difference between the reference voltage and the currently obtained second power supply voltage to obtain the target maximum Gamma voltage and the target minimum Gamma voltage comprises:

acquiring the second power supply voltage on the power line at least once when each frame of picture is displayed,

converting the second power supply voltage acquired each time into a second digital signal, and

adjusting the pre-stored initial maximum Gamma voltage and the pre-stored initial minimum Gamma voltage based on a difference between a currently obtained second digital signal and the stored reference voltage, to obtain the target maximum Gamma voltage and the target minimum Gamma voltage.

13 . The voltage compensation method according to claim 12 , wherein obtaining the reference voltage based on the at least one first digital signal comprises:

obtaining the reference voltage based on an average value of a plurality of first digital signals.

14 . The voltage compensation method according to claim 12 , wherein adjusting the pre-stored initial maximum Gamma voltage and the pre-stored initial minimum Gamma voltage based on the difference between the currently obtained second digital signal and the stored reference voltage to obtain the target maximum Gamma voltage and the target minimum Gamma voltage comprises:

determining whether the difference between the currently obtained second digital signal and the stored reference voltage is greater than a threshold; and

based on the difference between the currently obtained second digital signal and the stored reference voltage being greater than the threshold, adjusting the pre-stored initial maximum Gamma voltage and the pre-stored initial minimum Gamma voltage separately based on the difference between the currently obtained second digital signal and the stored reference voltage, to obtain the target maximum Gamma voltage and the target minimum Gamma voltage.

15 . The voltage compensation method according to claim 14 , further comprising:

based on a respective difference between a respective currently obtained second digital signal and the stored reference voltage being less than or equal to the threshold, setting a respective target maximum Gamma voltage to be equal to the pre-stored initial maximum Gamma voltage, and a respective target minimum Gamma voltage to be equal to the pre-stored initial minimum Gamma voltage.