Display device using power sync signal to conserve power and operating method for the same

• US 10,147,383 B2
• Filed: 02/29/2016
• Issued: 12/04/2018
• Est. Priority Date: 04/07/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Tae-hoon, Ha, Tae-hyeun
• Primary Examiner(s): Park, Sanghyuk
• Application Number:
  US15/055,799
• Publication Number:
  US 20160300543A1
• Time in Patent Office: 1,009 Days
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A display device including a display panel is provided, the display device including a plurality of pixels, a display controller configured to input image data to the plurality of pixels during a second time within a first time, the first time being determined by a scanning frequency of the display panel and to maintain the image data input to the plurality of pixels during a third time, the third time being a part or all of the first time excluding the second time, and a power supply configured to supply power to the display panel and the display controller. The display controller generates a power sync signal which is enabled during the second time, and the power supply supplies the power based on the power sync signal.

Claims

1. A display device comprising:

a display panel including a plurality of pixels;

a display controller configured to input image data to the plurality of pixels during a second time within a first time, the first time being determined based on a scanning frequency of the display panel, and to maintain the image data input to the plurality of pixels during a third time, the third time being all or part of the first time excluding the second time; and

a power supply configured to supply power to the display panel and the display controller,

wherein the display controller is configured to generate a power sync signal enabled during the second time, and to enable the power sync signal prior to the second time during a data hold period, and

the power supply is configured to supply the power based on the power sync signal, so that a source in a backlight of the display device is turned on based on the power sync signal near an end of the second time.

2. The display device of claim 1, wherein the power supply includes a switching mode power supply (SMPS).

3. The display device of claim 2, wherein the power supply is configured to perform switching to supply the power when the power sync signal is enabled, and to stop the switching when the power sync signal is disabled.

4. The display device of claim 3, wherein a voltage of the supplied power increases to a preset voltage when the switching is performed, and the voltage of the supplied power gradually decreases when the switching is stopped.

5. The display device of claim 1, further comprising a backlight unit configured to emit light to the display panel,

wherein the backlight unit emits light when the power sync signal is enabled.

6. The display device of claim 1, wherein a first power consumption is consumed during the second time, and

a second power consumption which is lower than the first power consumption is consumed during the third time.

7. The display device of claim 6, wherein each of the first power consumption and the second power consumption is lower than a highest power consumption of the display device.

8. A method for operating a display device, the method comprising:

inputting image data to each of a plurality of pixels included in a display panel during a second time within a first time, the first time being determined based on a scanning frequency of the display panel, and maintaining the image data input to each of the plurality of pixels during a third time, the third time being part or all of the first time excluding the second time;

generating a power sync signal enabled during the second time, wherein the power sync signal is enabled prior to the second time during a data hold period; and

supplying power to the display panel and a display controller based on the power sync signal, and turning on a source in a backlight of the display device based on the power sync signal near an end of the second time.

9. The operating method of claim 8, wherein the supplying power to the display panel and the display controller based on the power sync signal comprises performing switching for supplying the power when the power sync signal is enabled, and stopping the switching when the power sync signal is disabled.

10. The operating method of claim 9, wherein a voltage of the supplied power increases to a preset voltage when the switching is performed, and the voltage of the supplied power gradually decreases when the switching is stopped.

11. The operating method of claim 8, further comprising emitting light to the display panel when the power sync signal is enabled.

12. The operating method of claim 8, further comprising consuming a first power consumption during the second time, and consuming a second power consumption which is lower than the first power consumption during the third time.

13. The operating method of claim 12, wherein the first power consumption and the second power consumption are lower than a highest power consumption of the display device.

14. A non-transitory computer-readable recording medium storing a program which, when executed, causes a computer to perform the operations of claim 8.