Power management method and display device thereof

• US 9,330,608 B2
• Filed: 06/17/2014
• Issued: 05/03/2016
• Est. Priority Date: 01/16/2014
• Status: Active Grant

• Current Assignee: Wistron Corporation
• Original Assignee: Wistron Corporation
• Inventors: Qiu, JunXin
• Primary Examiner(s): Moon, Seokyun
• Application Number:
  US14/306,624
• Publication Number:
  US 20150199940A1
• Time in Patent Office: 686 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G09G 2320/06 Adjustment of display parameters
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/04 Display protection
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336

Abstract

A power management method a display device utilizes the same are disclosed. The power management method, adopted by the display device, includes: increasing, by a control circuit, brightness of a lighting device, wherein the lighting device is configured to illuminate a display panel device; detecting, by an overload detection circuit, whether an overload has been triggered by the increased brightness; and when the overload has been triggered by the increased brightness, recording, by a power capacity determination circuit, a maximal predetermined brightness that is used prior to the overload is triggered, while showing an on-screen-display (OSD) warning message on a display of the display device for reminding the user. When the brightness of the lighting device reaches the maximal predetermined brightness and the power capacity determination circuit detects no overload, this indicates the power capacity is sufficient for supplying power to the display device.

Claims

1. A power management method, performed by a display device, comprising:

increasing, by a control circuit, a brightness of a light source device, wherein the light source device is configured to illuminate a panel display device;

determining, by an overload detection circuit, whether the increased brightness triggers an overload; and

when the increased brightness triggers the overload, recording, by a power capacity determination circuit, a maximal brightness before the overload is triggered as a maximal predetermined brightness.

2. The power management method of claim 1, further comprising:

when the increased brightness does not trigger the overload, continuing to increase the brightness of the light source device.

3. The power management method of claim 1, further comprising:

when the increased brightness is less than a maximum predetermined brightness, increasing the brightness of the light source device.

4. The power management method of claim 1, further comprising:

detecting, by the overload detection circuit, an occurrence of the overload in a predetermined period.

5. The power management method of claim 1, wherein the step of determining whether the increased brightness triggers the overload comprises:

detecting, by the overload detection circuit, a voltage level from a power source; and

when the voltage level is less than a voltage threshold, determining the overload is triggered.

6. The power management method of claim 1, wherein the step of determining whether the increased brightness triggers the overload comprises:

detecting, by the overload detection circuit, a current level from a power source; and

when the current level exceeds a current threshold, determining the overload is triggered.

7. The power management method of claim 1, further comprising:

adjusting, by the control circuit, the brightness of the light source device to be the maximal predetermined brightness when the increased brightness triggers the overload.

8. The power management method of claim 1, further comprising:

when the increased brightness triggers the overload, displaying, by the panel display device, a warning message about the overload.

9. A display device, performing a power management method, comprising:

a panel display device;

a light source device, configured to illuminate the panel display device;

a control circuit, configured to increase a brightness of the light source device;

an overload detection circuit, configured to determine whether the increased brightness triggers an overload; and

a power capacity determination circuit, when the increased brightness triggers the overload, configured to record a maximal brightness before the overload is triggered as a maximal predetermined brightness.

10. The display device of claim 9, wherein:

when the increased brightness does not trigger the overload, the control circuit is configured to continue to increase the brightness of the light source device.

11. The display device of claim 9, wherein:

when the increased brightness is less than a maximum predetermined brightness, the control circuit is configured to increase the brightness of the light source device.

12. The display device of claim 9, wherein:

the overload detection circuit is configured to detect an occurrence of the overload in a predetermined period.

13. The display device of claim 9, wherein:

the overload detection circuit is configured to detect a voltage level from a power source, and when the voltage level is less than a voltage threshold, determine the overload is triggered.

14. The display device of claim 9, wherein:

the overload detection circuit is configured to detect, by the overload detection circuit, a current level from a power source, and when the current level exceeds a current threshold, determine the overload is triggered.

15. The display device of claim 9, wherein:

the control circuit is configured to adjust the brightness of the light source device to be the maximal predetermined brightness when the increased brightness triggers the overload.

16. The display device of claim 9, wherein:

when the increased brightness triggers the overload, the panel display device is configured to display a warning message about the overload.