DISPLAY DRIVING CIRCUIT AND DISPLAY DEVICE INCLUDING THE SAME

• US 20200135117A1
• Filed: 12/31/2019
• Published: 04/30/2020
• 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
• Granted Patent: US 11,069,767 B2
• Time in Patent Office: Days
• 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 circuitry configured to generate a first internal voltage; and

a processing circuitry configured to receive the first internal voltage, to determine whether to change the first internal voltage, and to output a voltage change signal when the processing circuitry determines to change the first internal voltage,

wherein the power supply circuit is configured to supply a changed first voltage different from the first internal voltage to the processing circuitry in response to the voltage change signal.

2. The display driving circuit of claim 1, wherein the processing circuitry is configured to determine whether to change the first internal voltage based on at least one of a mode signal, an image data, and a clock.

3. The display driving circuit of claim 2, wherein the display driving circuit operates in a plurality of modes including a normal mode and a low power mode in response to the at least one of the mode signal, the image data, and the clock.

4. The display driving circuit of claim 3, wherein the low power mode is an always-on-display mode in which the display panel is always turned on with maintaining low brightness.

5. The display driving circuit of claim 3, further comprises a memory configured to receive a second internal voltage from the power supply circuitry.

6. The display driving circuit of claim 5, wherein the power supply circuitry is configured to supply a changed second internal voltage to the memory in response to the voltage change signal.

7. The display driving circuit of claim 6, wherein the power supply circuitry comprises a first power module configured to supply the first internal voltage and a second power module configured to output the second internal voltage.

8. The display driving circuit of claim 7, wherein the processing circuitry comprises a voltage variable determination logic configured to determine whether to change the first internal voltage and a first voltage control logic configured to generate the voltage change signal.

9. A display driving circuit comprising:

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

a power supply circuitry configured to receive an external voltage from an external device and to generate a first voltage; and

a processing circuitry configured to receive the first voltage, to determine whether to change the external voltage, and to output a voltage change signal to the external device when the processing circuitry determines to change the external voltage.

10. The display driving circuit of claim 9, wherein the power supply circuitry is configured to receive a changed external voltage different from the external voltage from the external device after the processing circuitry outputs the voltage change signal.

11. The display driving circuit of claim 10, wherein the processing circuitry is configured to determine whether to change the external voltage based on at least one of a mode signal, an image data, and a clock.

12. The display driving circuit of claim 11, wherein the display driving unit operates in a plurality of modes including a normal mode and a low power mode in response to the at least one of the mode signal, the image data, and the clock.

13. The display driving unit of claim 12, wherein the low power mode is an always-on-display mode in which the display panel is always turned on with maintaining low brightness.

14. The display driving circuit of claim 9, further comprises a memory configured to receive a second voltage different from the first voltage from the power supply circuitry.

15. The display driving circuit of claim 14, wherein the processing circuitry is configured to receive a changed first voltage different from the first voltage and the memory is configured to receive the changed second voltage different from the second voltage after the processing circuitry outputs the voltage change signal.

16. The display driving circuit of claim 14, wherein the processing circuitry is configured to receive the first voltage and the memory is configured to receive the second voltage after the processing circuitry outputs the voltage change signal.

17. The display driving circuit of claim 14, wherein the processing circuitry is configured to receive a changed first voltage different from the first voltage and the memory is configured to receive the second voltage after the processing circuitry outputs the voltage change signal.

18. A display driving circuit comprising:

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

a power supply circuitry configured to receive an external voltage from an external device and to generate a first voltage; and

a processing circuitry configured to receive the first voltage, to determine whether to change the external voltage and the first voltage, and to output a voltage change signal to the external device and the power supply circuitry when the processing circuitry determines to change the external voltage and the first voltage.

19. The display driving circuit of claim 18, wherein the processing circuitry is configured to determine whether to change the external voltage and the first voltage based on at least one of a mode signals, an image data, and a clock.

20. The display driving circuit of claim 19, wherein the display driving circuit operates in a plurality of modes including a normal mode and a low power mode in response to the at least one of the mode signal, the image data, and the clock.