Display driving circuit and display device including the same

• US 10,593,266 B2
• Filed: 05/21/2018
• Issued: 03/17/2020
• Est. Priority Date: 10/31/2017
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cheon, Seong Min, Suh, Dong Wook, Lee, Ji Hyun
• Primary Examiner(s): Taylor, Jr., Duane N
• Application Number:
  US15/984,782
• Publication Number:
  US 20190130834A1
• Time in Patent Office: 666 Days
• Field of Search: None
• CPC Class Codes: G09G 2310/0243 Details of the generation of driving signals
• CPC Class Codes: G09G 2310/0264 Details of driving circuits
• CPC Class Codes: G09G 2310/0291 Details of output amplifiers or buffers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• 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 2370/08 Details of image data interface between the display device controller and the data line driver circuit
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: G09G 5/003 Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto specific for a CRT G09G1/165; for a flat panel G09G3/2092
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals

Abstract

A display driving circuit and a display device including the same are provided. The display driving circuit includes a source driver which applies source data to a display panel, a power supply unit which receives an external voltage from a power module to generate an internal voltage and a logic unit which is supplied with the internal voltage to control the source driver, wherein the logic unit includes a voltage variable determination logic which determines whether a supply voltage including the internal voltage and the external voltage is changed, thereby generating a voltage variable signal, and a voltage control logic which receives the voltage variable signal to change the supply voltage.

Claims

1. A display driving circuit comprising:

a source driver configured to apply source data to a display panel;

a power supply configured to receive an external voltage from an interface (I/F) of a power module, and to generate an internal voltage; and

processing circuitry configured to,

determine whether to change a supply voltage associated with the display driving circuit, the supply voltage including one or more of the internal voltage and the external voltage, and

output a voltage change signal if the processing circuitry determines to change the supply voltage.

2. The display driving circuit of claim 1, further comprising:

a processor configured to generate a mode change signal for setting an operation mode of the display driving circuit, wherein

the processing circuitry is configured to determine whether to change the supply voltage based on the mode change signal.

3. The display driving circuit of claim 1, wherein the processing circuitry is configured to,

decode image data,

determine whether to change the supply voltage based on the image data, and

transmit the image data to the source driver.

4. The display driving circuit of claim 3, wherein the processing circuitry is configured to determine whether to change the supply voltage based on at least one of a toggle amount of the image data, an on-pixel ratio (OPR), and an average of a most significant bit (MSB) of the image data.

5. The display driving circuit of claim 3, wherein the processing circuitry is configured to,

receive a clock having a frame frequency, and

determine whether to change the supply voltage based on the frame frequency.

6. The display driving circuit of claim 5, wherein the processing circuitry is configured to,

generate a frequency change command, and

modify the clock by changing the frame frequency based on the frequency change command.

7. The display driving circuit of claim 6, further comprising:

a processor configured to generate a mode change signal for setting an operation mode of the display driving circuit, wherein

the processing circuitry is configured to generate the frequency change command based on the mode change signal.

8. The display driving circuit of claim 6, further comprising:

a memory configured to store the image data as first image data, wherein

the processing circuitry is configured to,

receive second image data from a processor,

receive the first image data from the memory, and

generate the frequency change command based on a similarity between the first image data and the second image data.

9. A display device comprising:

a display panel configured to display source data;

a power module including an interface (I/F) configured to provide an external voltage to the display device; and

a display driving circuit including,

a power supply configured to receive the external voltage from the power module to generate an internal voltage, and

processing circuitry configured to,

determine whether to change the internal voltage generated by the power supply or the external voltage provided to the power supply, and

transmit the source data and a gate signal to the display panel to drive the display panel.

10. The display device of claim 9, wherein the power supply includes a voltage control resistance row configured to control the internal voltage, and

the processing circuitry is configured to control the voltage control resistance row to change the internal voltage.

11. The display device of claim 9, wherein

the processing circuitry is configured to generate a voltage change signal, if the processing circuitry determines to change one or more of the internal voltage and the external voltage, and to transmit the voltage change signal to one of the power supply or the power module,

the power supply is configured to control the internal voltage based on the voltage change signal, and

the power module is configured to control the external voltage based on the voltage change signal.

12. The display device of claim 9, further comprising:

a processor configured to transfer an image and operation mode data to the processing circuitry.

13. The display device of claim 12, wherein the processing circuitry is configured to determine whether to change one or more of the internal voltage and the external voltage based on the operation mode data.

14. The display device of claim 12, wherein the processing circuitry is configured to determine whether to change one or more of the internal voltage and the external voltage based on the image.

15. The display device of claim 12, wherein the processing circuitry is configured to determine whether to change one or more of the internal voltage and the external voltage based on a frame frequency of the image.

16. The display device of claim 12, further comprising:

a memory configured to store the image, the memory configured to receive a memory voltage from the power supply, wherein

the processing circuitry is configured to change the memory voltage provided to the memory.

17. A display driving circuit comprising:

a source driver configured to apply source data to a display panel, the source data corresponding to image data;

a power supply configured to receive an external voltage from an interface (I/F) of a power module to generate an internal voltage;

a clock generator configured to generate a clock having a frame frequency; and

processing circuitry configured to,

receive the internal voltage, the clock and the image data,

determine whether to change one or more of the internal voltage and the external voltage based on at least one of a command, the image data, and the frame frequency of the clock,

output a voltage change signal to change one or more of the internal voltage and the external voltage in response to the processing circuitry determining to change one or more of the internal voltage and the external voltage.

18. The display driving circuit of claim 17, wherein

the power supply includes a voltage control resistance row configured to control the internal voltage, and

the processing circuitry is configured to control the voltage control resistance row to change the internal voltage.

19. The display driving circuit of claim 17, wherein

the processing circuitry is configured to change the external voltage by outputting the voltage change signal to the power module, and

the power module is configured control the external voltage based on the voltage change signal.

20. The display driving circuit of claim 19, wherein

the processing circuitry is configured to transfer a frame frequency change command to the clock generator, and

the clock generator is configured to change the frame frequency of the clock based on the frame frequency change command.