Driving power supply, display driving circuit and organic light emitting diode display

• US 10,283,050 B2
• Filed: 04/17/2015
• Issued: 05/07/2019
• Est. Priority Date: 11/19/2014
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Yin, Xinshe
• Primary Examiner(s): Lam, Vinh T
• Application Number:
  US14/784,294
• Publication Number:
  US 20160314741A1
• Time in Patent Office: 1,481 Days
• Field of Search: 345690, 345699, 345210-215, 345 39, 345 44- 53, 345 63, 345 69- 72, 345 76- 80, 345 82- 95, 345 98-101, 315 91, 315117-118, 315141-148, 315161-176, 315201-208, 315210-217, 315246-272, 315276-287, 315302-305, 315313, 323259, 323344
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2330/023 using energy recovery or conservation
• CPC Class Codes: G09G 2330/028 Generation of voltages supplied to electrode drivers in a matrix display other than LCD
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• 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

Abstract

The present invention discloses a driving power supply, a display driving circuit and an organic light emitting diode display. The driving power supply comprises a boost module and a voltage adjusting module connected to the boost module; the boost module is used for boosting an initial voltage input from an initial voltage input terminal of the driving power supply to generate a reference voltage and outputting the reference voltage to the voltage adjusting module; the voltage adjusting module is used for adjusting magnitude of the reference voltage according to colors of pixel units to be driven to generate a plurality of driving voltages, respectively, and the driving voltages corresponding to pixel units of different colors are different.

Claims

1. A driving power supply, comprising a boost module and a voltage adjusting module connected to the boost module,

wherein, the boost module is used for boosting an initial voltage input from an initial voltage input terminal of the driving power supply to generate a reference voltage and for outputting the reference voltage to the voltage adjusting module;

the voltage adjusting module is used for adjusting magnitude of the reference voltage according to colors of pixel units to be driven to generate a plurality of driving voltages, respectively, wherein, the driving voltages corresponding to pixel units of different colors are different, the plurality of driving voltages are outputted through a plurality of driving voltage output terminals of the voltage adjusting module, respectively, and each of the plurality of driving voltage output terminals is used for driving pixel units of one color, and different driving voltage output terminals output different driving voltages, and

the voltage adjusting module comprises a pulse control module used for generating pulse control signals, and a duty ratio of each pulse control signal is related to the reference voltage.

2. The driving power supply according to claim 1, wherein, the voltage adjusting module comprises:

second switching tubes and second filter capacitors, the number of the second switching tubes and the number of the second filter capacitors are equal to that of the driving voltage output terminals, the second switching tubes are in one-to-one correspondence with the driving voltage output terminals, and the second filter capacitors are in one-to-one correspondence with the driving voltage output terminals;

gates of the second switching tubes are connected to the pulse control module, first electrodes of the second switching tubes are connected to the boost module, second electrodes of the second switching tubes are connected to the corresponding driving voltage output terminals and first terminals of the second filter capacitors;

second terminals of the second filter capacitors are grounded; and

the pulse control module is used for sending the pulse control signals to the second switching tubes, respectively, and the duty ratio of each pulse control signal equals to a ratio between the driving voltage output from the driving voltage output terminal connected to the second switching tube which receives said pulse control signal and the reference voltage.

3. The driving power supply according to claim 2, wherein, the pulse control module comprises:

a pulse-adjusting control sub-module, a pulse generator, a pulse width modulation circuit and a level conversion circuit, and the pulse width modulation circuit is connected to all of the pulse-adjusting control sub-module, the pulse generator and the level conversion circuit;

the pulse-adjusting control sub-module is used for generating a plurality of pulse-adjusting control signals according to the reference voltage and the driving voltages to be generated by the voltage adjusting module;

the pulse generator is used for generating an initial pulse signal with a preset frequency;

the pulse width modulation circuit is used for performing pulse width modulation on the initial pulse signal according to the respective pulse-adjusting control signals, so as to generate a plurality of initial pulse control signals; and

the level conversion circuit is used for performing level conversion on the initial pulse control signals so as to generate a plurality of pulse control signals, which are used for controlling on/off states of the second switching tubes, respectively.

4. The driving power supply according to claim 3, wherein, the pulse-adjusting control sub-module comprises:

a storage device and a decoding circuit connected to both the storage device and the pulse width modulation circuit;

the storage device stores data information of the reference voltage and data information of the driving voltages to be generated by the voltage adjusting module; and

the decoding circuit is used for performing a decoding process on the data information of the reference voltage and the data information of the driving voltages to be generated by the voltage adjusting module, so as to obtain voltage values of the reference voltage and the driving voltages to be generated by the voltage adjusting module, and the decoding circuit is further used for generating pulse-adjusting control signals according to ratios between the voltage values of the driving voltages to be generated by the voltage adjusting module and the voltage value of the reference voltage.

5. The driving power supply according to claim 4, wherein, the storage device is a read-only memory, which pre-stores data information of the driving voltages corresponding to the pixel units of different colors and the data information of the reference voltage.

6. The driving power supply according to claim 4, wherein, the storage device is a register, and the pulse-adjusting control sub-module further comprises:

a signal receiver, which is connected to the decoding circuit;

the signal receiver is used for receiving a timing control signal sent by a timing controller outside the driving power supply, and the timing control signal includes the data information of the reference voltage and the data information of the driving voltages to be generated by the voltage adjusting module; and

the decoding circuit is further used for decoding the timing control signal to obtain the data information of the reference voltage and the data information of the driving voltages to be generated by the voltage adjusting module therein, and storing the decoded data information of the reference voltage and the decoded data information of the driving voltages to be generated by the voltage adjusting module into the register.

7. The driving power supply according to claim 3, wherein, the pulse-adjusting control sub-module comprises:

a first level signal input terminal and groups of divider resistors whose number is the same as that of the driving voltage output terminals, and each group of divider resistors comprises;

a third resistor and a fourth resistor connected in series;

the first level signal input terminal is connected to first terminals of the third resistors, second terminals of the fourth resistors are grounded, second terminals of the third resistors and first terminals of the fourth resistors are connected to the pulse width modulation circuit;

the first level signal input terminal is used for generating a first initial level signal and outputting the first initial level signal to the groups of divider resistors;

the groups of divider resistors each are used for performing voltage dividing process on the first initial level signal to generate the pulse-adjusting control signals; and

ratios between resistance values of the third resistors and resistance values of the fourth resistors in different groups of divider resistors are different.

8. The driving power supply according to claim 3, wherein, the pulse-adjusting control sub-module comprises:

a second level signal input terminal and fifth resistors whose number is the same as that of the driving voltage output terminals, the second level signal input terminal is connected to first terminals of the fifth resistors, and second terminals of the fifth resistors are connected to the pulse width modulation circuit;

the second level signal input terminal is used for generating a second initial level signal and outputting the second initial level signal to the fifth resistors;

the fifth resistors each are used for performing voltage reduction on the second initial level signal to generate the pulse-adjusting control signals; and

resistance values of the fifth resistors are different from each other.

9. The driving power supply according to claim 2, wherein, the pixel units include:

red pixel units, green pixel units and blue pixel units, and the number of the driving voltage output terminals is three.

10. The driving power supply according to claim 9, wherein, the pulse control signals include:

red pulse control signal, green pulse control signal and blue pulse control signal;

phase differences between a rising edge of any one of the red pulse control signal, the green pulse control signal and the blue pulse control signal and rising edges of the other two pulse control signals are both 120 degrees;

or,

phase differences between a falling edge of any one of the red pulse control signal, the green pulse control signal and the blue pulse control signal and falling edges of the other two pulse control signals are both 120 degrees.

11. The driving power supply according to claim 2, wherein, the pulse control module is a single chip microcomputer.

12. The driving power supply according to claim 1, wherein, the voltage adjusting module comprises:

linear voltage regulators and third filter capacitors, the number of the linear voltage regulators and the number of the third filter capacitors are the same as that of the driving voltage output terminals, the linear voltage regulators are in one-to-one correspondence with the driving voltage output terminals, and the third filter capacitors are in one-to-one correspondence with the driving voltage output terminals;

input terminals of the linear voltage regulators are connected to the boost module, and output terminals of the linear voltage regulators are connected to the driving voltage output terminals and first terminals of the third filter capacitors;

second terminals of the third filter capacitors are grounded;

the linear regulators each are used for performing voltage reduction on the reference voltage to generate the driving voltages; and

different linear voltage regulators have different voltage reduction extents.

13. A display driving circuit, comprising:

the driving power supply according to claim 1.

14. The display driving circuit according to claim 13, wherein, the voltage adjusting module comprises:

second switching tubes and second filter capacitors, the number of the second switching tubes and the number of the second filter capacitors are equal to that of the driving voltage output terminals, the second switching tubes are in one-to-one correspondence with the driving voltage output terminals, and the second filter capacitors are in one-to-one correspondence with the driving voltage output terminals;

gates of the second switching tubes are connected to the pulse control module, first electrodes of the second switching tubes are connected to the boost module, second electrodes of the second switching tubes are connected to the corresponding driving voltage output terminals and first terminals of the second filter capacitors;

second terminals of the second filter capacitors are grounded; and

the pulse control module is used for sending the pulse control signals to the second switching tubes, respectively, and the duty ratio of each pulse control signal equals to a ratio between the driving voltage output from the driving voltage output terminal connected to the second switching tube which receives said pulse control signal and the reference voltage.

15. The display driving circuit according to claim 14, wherein, the pulse control module comprises:

a pulse-adjusting control sub-module, a pulse generator, a pulse width modulation circuit and a level conversion circuit, and the pulse width modulation circuit is connected to all of the pulse-adjusting control sub-module, the pulse generator and the level conversion circuit;

the pulse-adjusting control sub-module is used for generating a plurality of pulse-adjusting control signals according to the reference voltage and the driving voltages to be generated by the voltage adjusting module;

the pulse generator is used for generating an initial pulse signal with a preset frequency;

the pulse width modulation circuit is used for performing pulse width modulation on the initial pulse signal according to the respective pulse-adjusting control signals, so as to generate a plurality of initial pulse control signals; and

the level conversion circuit is used for performing level conversion on the initial pulse control signals so as to generate a plurality of pulse control signals, which are used for controlling on/off states of the second switching tubes, respectively.

16. The display driving circuit according to claim 15, wherein, the pulse-adjusting control sub-module comprises:

a storage device and a decoding circuit connected to both the storage device and the pulse width modulation circuit;

the storage device stores data information of the reference voltage and data information of the driving voltages to be generated by the voltage adjusting module; and

the decoding circuit is used for performing a decoding process on the data information of the reference voltage and the data information of the driving voltages to be generated by the voltage adjusting module, so as to obtain voltage values of the reference voltage and the driving voltages to be generated by the voltage adjusting module, and the decoding circuit is further used for generating pulse-adjusting control signals according to ratios between the voltage values of the driving voltages to be generated by the voltage adjusting module and the voltage value of the reference voltage.

17. The display driving circuit according to claim 13, wherein, the voltage adjusting module comprises:

linear voltage regulators and third filter capacitors, the number of the linear voltage regulators and the number of the third filter capacitors are the same as that of the driving voltage output terminals, the linear voltage regulators are in one-to-one correspondence with the driving voltage output terminals, and the third filter capacitors are in one-to-one correspondence with the driving voltage output terminals;

input terminals of the linear voltage regulators are connected to the boost module, and output terminals of the linear voltage regulators are connected to the driving voltage output terminals and first terminals of the third filter capacitors;

second terminals of the third filter capacitors are grounded;

the linear regulators each are used for performing voltage reduction on the reference voltage to generate the driving voltages; and

different linear voltage regulators have different voltage reduction extents.

18. An organic light emitting diode display, comprising:

the display driving circuit according to claim 13.