Gamma voltage generating circuit, driver circuit and display device

1. A gamma voltage generating circuit, comprising N gamma voltage generating sub-circuits, wherein N is greater than or equal to 2;

each gamma voltage generating sub-circuit includes:

a plurality of gamma reference voltage output terminals;

a gamma voltage generation circuit, output terminals of the gamma voltage generation circuit being electrically connected to a highest gamma reference voltage output terminal and a lowest gamma reference voltage output terminal in the plurality of gamma reference voltage output terminals, respectively; and

a resistive voltage divider circuit, including a plurality of resistors connected in series, one of the plurality of resistors being connected between every two adjacent gamma reference voltage output terminals, wherein any two of the N resistive voltage divider circuits have a same resistance ratio of the plurality of resistors connected in series;

the N gamma voltage generating sub-circuits include:

a first gamma voltage generating sub-circuit; and

at least one second gamma voltage generating sub-circuit, wherein

each second gamma voltage generating sub-circuit further includes a voltage modification module configured to modify voltages at output terminals of a gamma voltage generation circuit of the second gamma voltage generating sub-circuit, according to a voltage difference between gamma reference voltage output terminals corresponding to a same gray scale of the first gamma voltage generating sub-circuit and the second gamma voltage generating sub-circuit, so as to make voltages at gamma reference voltage output terminals of the N gamma voltage generating sub-circuits at the same gray scale are the same.

2. The gamma voltage generating circuit according to claim 1 , wherein each second gamma voltage generating sub-circuit further includes:

a first comparator, a non-inverting input terminal of the first comparator being electrically connected to a highest gamma reference voltage output terminal of the first gamma voltage generating sub-circuit, an inverting input terminal of the first comparator being electrically connected to a highest gamma reference voltage output terminal of the second gamma voltage generating sub-circuit; and

a second comparator, a non-inverting input terminal of the second comparator being electrically connected to a lowest gamma reference voltage output terminal of the first gamma voltage generating sub-circuit, an inverting input terminal of the second comparator being electrically connected to a lowest gamma reference voltage output terminal of the second gamma voltage generating sub-circuit.

3. The gamma voltage generating circuit according to claim 2 , wherein each second gamma voltage generating sub-circuit further includes:

a first voltage collector electrically connected between the first comparator and the highest gamma reference voltage output terminal of the second gamma voltage generating sub-circuit; and,

a second voltage collector electrically connected between the second comparator and the lowest gamma reference voltage output terminal of the second gamma voltage generating sub-circuit.

4. The gamma voltage generating circuit according to claim 2 , wherein the voltage modification module includes:

a first adder electrically connected to an output terminal of the first comparator and an input terminal connected to the highest gamma reference voltage output terminal of the second gamma voltage generating sub-circuit; and

a second adder electrically connected to an output terminal of the second comparator and an input terminal connected to the lowest gamma reference voltage output terminal of the second gamma voltage generating sub-circuit.

5. A driver circuit, comprising:

the gamma voltage generating circuit according to claim 1 ; and

a plurality of data driver circuits, wherein each of the plurality of data driver circuits is electrically connected to one gamma voltage generating sub-circuit of the gamma voltage generating circuit; and the gamma voltage generating sub-circuit is configured to provide gamma reference voltages to the data driver circuit.

6. A display device, comprising the driver circuit according to claim 5 .

7. The gamma voltage generating circuit according to claim 1 , wherein the voltage modification module includes operational amplifiers; and

a non-inverting input terminal of each operational amplifier is electrically connected to an output terminal of a corresponding gamma voltage generation circuit of the second gamma voltage generating sub-circuit, and an output terminal of the operational amplifier is electrically connected to a corresponding gamma reference voltage output terminal of the second gamma voltage generating sub-circuit, and an inverting terminal of the operational amplifier is configured to receive a voltage difference between gamma reference voltage output terminals corresponding to a same gray scale of the first gamma voltage generating sub-circuit and the second gamma voltage generating sub-circuit where the operational amplifier is located.

8. The gamma voltage generating circuit according to claim 1 , wherein in the N gamma voltage generating sub-circuits, gamma reference voltage output terminals corresponding to a same gray scale are connected.

9. A gamma voltage generating circuit, comprising N gamma voltage generating sub-circuits, wherein N is greater than or equal to 2;

each gamma voltage generating sub-circuit includes:

a plurality of gamma reference voltage output terminals; and

a resistive voltage divider circuit, including a plurality of resistors connected in series, one of the plurality of resistors being connected between every two adjacent gamma reference voltage output terminals, wherein any two of N resistive voltage divider circuits have a same resistance ratio of the plurality of resistors connected in series,

the N gamma voltage generating sub-circuits include a first gamma voltage generating sub-circuit, and the first gamma voltage generating sub-circuit further includes:

a gamma voltage generation circuit, output terminals of the gamma voltage generation circuit being electrically connected to a highest gamma reference voltage output terminal and a lowest gamma reference voltage output terminal in the plurality of gamma reference voltage output terminals of the first gamma voltage generating sub-circuit, respectively; and

first control switches, the first control switches being respectively disposed between an output terminal of the gamma voltage generation circuit and the highest gamma reference voltage output terminal, and between another output terminal of the gamma voltage generation circuit and the lowest gamma reference voltage output terminal, and the first control switches being configured to connect or disconnect the output terminal of the gamma voltage generation circuit and the highest gamma reference voltage output terminal, and to connect or disconnect the another output terminal of the gamma voltage generation circuit and the lowest gamma reference voltage output terminal,

wherein highest gamma reference voltage output terminals of the N gamma voltage generating sub-circuits are connected, and lowest gamma reference voltage output terminals of the N gamma voltage generating sub-circuits are connected.

10. The gamma voltage generating circuit according to claim 9 , wherein the N gamma voltage generating sub-circuits further include at least one second gamma voltage generating sub-circuit;

each second gamma voltage generating sub-circuit includes a gamma voltage generation circuit; and

output terminals of the gamma voltage generation circuit in the second gamma voltage generating sub-circuit are electrically connected to a highest gamma reference voltage output terminal and a lowest gamma reference voltage output terminal in a plurality of gamma reference voltage output terminals of the second gamma voltage generating sub-circuit, respectively.

11. The gamma voltage generating circuit according to claim 10 , wherein the second gamma voltage generating sub-circuit further includes second control switches provided between an output terminal of the gamma voltage generation circuit and the highest gamma reference voltage output terminal of the second gamma voltage generating sub-circuit, and between another output terminal of the gamma voltage generation circuit and the lowest gamma reference voltage output terminal of the second gamma voltage generating sub-circuit, respectively; and

the second control switches are configured to connect or disconnect the output terminal of the gamma voltage generation circuit and the highest gamma reference voltage output terminal of the second gamma voltage generating sub-circuit, and to connect or disconnect the another output terminal of the gamma voltage generation circuit and the lowest gamma reference voltage output terminal of the second gamma voltage generating sub-circuit.

12. A driver circuit, comprising:

the gamma voltage generating circuit according to claim 9 ; and

a plurality of data driver circuits, wherein each of the plurality of data driver circuits is electrically connected to one gamma voltage generating sub-circuit of the gamma voltage generating circuit; and the gamma voltage generating sub-circuit is configured to provide gamma reference voltages to the data driver circuit.

13. A display device, comprising the driver circuit according to claim 12 .

14. The gamma voltage generating circuit according to claim 9 , wherein in the N gamma voltage generating sub-circuits, gamma reference voltage output terminals corresponding to a same gray scale in gamma reference voltage output terminals other than the highest gamma reference voltage output terminals and the lowest gamma reference voltage output terminals are connected.

15. The gamma voltage generating circuit according to claim 9 , wherein each of the plurality of resistors is a variable resistor.