SOURCE DRIVING CIRCUITS, SOURCE DRIVING DEVICES, DISPLAY PANELS AND DISPLAY DEVICES

• US 20170287405A1
• Filed: 04/14/2016
• Published: 10/05/2017
• Est. Priority Date: 05/15/2015
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Tseng, Szu Heng
• Granted Patent: US 10,186,205 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2310/0291 Details of output amplifiers or buffers arranged for use in a driving circuit
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/028 Generation of voltages supplied to electrode drivers in a matrix display other than LCD
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3275 Details of drivers for data electrodes
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: G09G 3/3688 suitable for active matrices only
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

The present disclosure provides a source driving circuit, a source driving device, a display panel and a display apparatus, which relate to the field of display technology, and can solve the problem that the conventional source driving circuit has large power consumption and a short lifetime. The source driving circuit according to the present disclosure comprises: a first operational amplifier and an output selection unit, wherein the first operational amplifier has a non-inverting input terminal configured to receive an analog data voltage signal, an inverting input terminal connected to an output terminal thereof, and the output terminal further connected to a data voltage signal input terminal of the output selection unit, and the first operational amplifier is configured to amplify the analog data voltage signal; and the output selection unit further has a reference voltage signal input terminal and a selection control signal input terminal, and the output selection unit is configured to selectively output the amplified analog data voltage signal and a reference voltage signal input from the reference voltage signal input terminal to a data line under the control of a selection control signal input from the selection control signal input terminal.

Claims

1. -10. (canceled)

11. A source driving circuit, comprising a first operational amplifier and an output selection unit, wherein

the first operational amplifier has a non-inverting input terminal configured to receive an analog data voltage signal, an inverting input terminal connected to an output terminal thereof, and the output terminal further connected to a data voltage signal input terminal of the output selection unit, and the first operational amplifier is configured to amplify the analog data voltage signal;

and

the output selection unit has a reference voltage signal input terminal and a selection control signal input terminal, and the output selection unit is configured to selectively output the amplified analog data voltage signal and a reference voltage signal input from the reference voltage signal input terminal to a data line under control of a selection control signal input from the selection control signal input terminal.

12. The source driving circuit according to claim 11, further comprising a digital-to-analog converter, wherein

the digital-to-analog converter has an input terminal configured to receive a digital data voltage signal and an output terminal connected to the non-inverting input terminal of the first operational amplifier, and the digital-to-analog converter is configured to convert the digital data voltage signal into an analog data voltage signal.

13. The source driving circuit according to claim 11, wherein the first operational amplifier comprises a first transistor to a ninth transistor and a storage capacitor, wherein

the first transistor has a first electrode connected to a first electrode of the second transistor, a second electrode connected to a first electrode of the third transistor, and a control electrode connected to the non-inverting input terminal of the first operational amplifier;

the second transistor has the first electrode further connected to a second electrode of the fifth transistor, a second electrode connected to a first electrode of the fourth transistor, and a control electrode connected to the inverting input terminal of the first operational amplifier;

the third transistor has the first electrode further connected to a control electrode thereof, a second electrode connected to a low power supply terminal, and the control electrode further connected to a control electrode of the fourth transistor;

the fourth transistor has the first electrode further connected to a first terminal of the storage capacitor, and a second terminal connected to the low power supply terminal, wherein the storage capacitor has a second terminal connected to the output terminal of the first operational amplifier;

the fifth transistor has a first electrode connected to a high power supply terminal, the second electrode further connected to the first electrode of the first transistor and the first electrode of the second transistor, and a control electrode connected to a control electrode of the eighth transistor;

the sixth transistor has a first electrode connected to the high power supply terminal, a second electrode connected to a first electrode of the seventh transistor and the output terminal of the first operational amplifier, and a control electrode connected to the control electrode of the fifth transistor, the control electrode of the eighth transistor and a second electrode of the eighth transistor;

the seventh transistor has the first electrode further connected to the second terminal of the storage capacitor and the output terminal of the first operational amplifier, a second electrode connected to the low power supply terminal, and a control electrode connected to the first terminal of the storage capacitor;

the eighth transistor has a first electrode connected to the high power supply terminal, the second electrode further connected to a first electrode of the ninth transistor, and the control electrode connected to the second electrode thereof and the control electrode of the fifth transistor; and

the ninth transistor has the first electrode connected to the second electrode of the eighth transistor and a second electrode connected to a control electrode thereof and the low power supply terminal.

14. The source driving circuit according to claim 12, wherein the first operational amplifier comprises a first transistor to a ninth transistor and a storage capacitor, wherein

the first transistor has a first electrode connected to a first electrode of the second transistor, a second electrode connected to a first electrode of the third transistor, and a control electrode connected to the non-inverting input terminal of the first operational amplifier;

the second transistor has the first electrode further connected to a second electrode of the fifth transistor, a second electrode connected to a first electrode of the fourth transistor, and a control electrode connected to the inverting input terminal of the first operational amplifier;

the third transistor has the first electrode further connected to a control electrode thereof, a second electrode connected to a low power supply terminal, and the control electrode further connected to a control electrode of the fourth transistor;

the fourth transistor has the first electrode further connected to a first terminal of the storage capacitor, and a second terminal connected to the low power supply terminal, wherein the storage capacitor has a second terminal connected to the output terminal of the first operational amplifier;

the fifth transistor has a first electrode connected to a high power supply terminal, the second electrode further connected to the first electrode of the first transistor and the first electrode of the second transistor, and a control electrode connected to a control electrode of the eighth transistor;

the sixth transistor has a first electrode connected to the high power supply terminal, a second electrode connected to a first electrode of the seventh transistor and the output terminal of the first operational amplifier, and a control electrode connected to the control electrode of the fifth transistor, the control electrode of the eighth transistor and a second electrode of the eighth transistor;

the seventh transistor has the first electrode further connected to the second terminal of the storage capacitor and the output terminal of the first operational amplifier, a second electrode connected to the low power supply terminal, and a control electrode connected to the first terminal of the storage capacitor;

the eighth transistor has a first electrode connected to the high power supply terminal, the second electrode further connected to a first electrode of the ninth transistor, and the control electrode connected to the second electrode thereof and the control electrode of the fifth transistor; and

the ninth transistor has the first electrode connected to the second electrode of the eighth transistor and a second electrode connected to a control electrode thereof and the low power supply terminal.

15. The source driving circuit according to claim 11, wherein the output selection unit comprises an N-type transistor and a P-type transistor, wherein

one of the N-type transistor and the P-type transistor has a first electrode connected to the data voltage signal input terminal of the output selection unit, and the other of the N-type transistor and the P-type transistor has a first electrode connected to the reference voltage signal input terminal of the output selection unit, and both of the N-type transistor and the P-type transistor have respective second electrodes connected with each other and further connected to the output terminal of the source driving circuit, and respective control electrodes connected with each other and further connected to the selection control signal input terminal of the output selection unit.

16. The source driving circuit according to claim 12, wherein the output selection unit comprises an N-type transistor and a P-type transistor, wherein

one of the N-type transistor and the P-type transistor has a first electrode connected to the data voltage signal input terminal of the output selection unit, and the other of the N-type transistor and the P-type transistor has a first electrode connected to the reference voltage signal input terminal of the output selection unit, and both of the N-type transistor and the P-type transistor have respective second electrodes connected with each other and further connected to the output terminal of the source driving circuit, and respective control electrodes connected with each other and further connected to the selection control signal input terminal of the output selection unit.

17. The source driving circuit according to claim 12, wherein the digital-to-analog converter comprises 2n resistors connected in series and multiple stages of logic switches, wherein n is an integer greater than or equal to 1;

and

each stage of logic switches comprises at least one logic switch, and each logic switch in a first stage of logic switches corresponds to a resistor and has an input terminal connected to a first terminal of corresponding resistor,

for each stage of logic switches, each logic switch in a next stage of logic switches has an input terminal connected to output terminals of corresponding two adjacent logic switches in this stage of logic switches, and any two adjacent logic switches are controlled using different logic levels.

18. A source driving device, comprising a plurality of the source driving circuits according to claim 11.

19. A source driving device, comprising a plurality of the source driving circuits according to claim 12.

20. A source driving device, comprising a plurality of the source driving circuits according to claim 13.

21. A source driving device, comprising a plurality of the source driving circuits according to claim 15.

22. The source driving device according to claim 18, further comprising a second operational amplifier, wherein

the second operational amplifier has a non-inverting input terminal configured to receive a reference voltage signal, an inverting input terminal connected to an output terminal thereof, and the output terminal further connected to the reference voltage signal input terminal of the output selection unit, and the second operational amplifier is configured to amplify the reference voltage signal and output the amplified reference voltage signal to the reference voltage signal input terminal of the output selection unit.

23. The source driving device according to claim 19, further comprising a second operational amplifier, wherein

the second operational amplifier has a non-inverting input terminal configured to receive a reference voltage signal, an inverting input terminal connected to an output terminal thereof, and the output terminal further connected to the reference voltage signal input terminal of the output selection unit, and the second operational amplifier is configured to amplify the reference voltage signal and output the amplified reference voltage signal to the reference voltage signal input terminal of the output selection unit.

24. The source driving device according to claim 20, further comprising a second operational amplifier, wherein

the second operational amplifier has a non-inverting input terminal configured to receive a reference voltage signal, an inverting input terminal connected to an output terminal thereof, and the output terminal further connected to the reference voltage signal input terminal of the output selection unit, and the second operational amplifier is configured to amplify the reference voltage signal and output the amplified reference voltage signal to the reference voltage signal input terminal of the output selection unit.

25. The source driving device according to claim 21, further comprising a second operational amplifier, wherein

the second operational amplifier has a non-inverting input terminal configured to receive a reference voltage signal, an inverting input terminal connected to an output terminal thereof, and the output terminal further connected to the reference voltage signal input terminal of the output selection unit, and the second operational amplifier is configured to amplify the reference voltage signal and output the amplified reference voltage signal to the reference voltage signal input terminal of the output selection unit.

26. The source driving device according to claim 22, wherein the second operational amplifier has a same structure as that of the first operational amplifier.

27. The source driving device according to claim 23, wherein the second operational amplifier has a same structure as that of the first operational amplifier.

28. The source driving device according to claim 24, wherein the second operational amplifier has a same structure as that of the first operational amplifier.

29. A display panel, comprising the source driving device according to claim 18.

30. A display device, comprising the display panel according to claim 29.