Display system and power control method thereof

• US 8,884,941 B2
• Filed: 07/19/2006
• Issued: 11/11/2014
• Est. Priority Date: 04/11/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Sea-La, Lee, Eun Ji, Lee, Soo-Man, Lee, Kee Hyoung, Nam, Won Jung
• Primary Examiner(s): Sitta, Grant
• Application Number:
  US12/227,013
• Publication Number:
  US 20100066765A1
• Time in Patent Office: 3,037 Days
• Field of Search: 345/204, 345/87, 345/690, 340/815.45, 340/815, 340/45
• US Class Current: 345/211
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3265 Power saving in display device
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• 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 3/22 using controlled light sources
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• 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: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04
• CPC Class Codes: H04N 5/63 Generation or supply of power specially adapted for television receivers
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A display system is provided The display system includes a power source unit for supplying power; a signal input unit for receiving a video signal from the outside; a video processor for converting a format of the video signals received from the signal input unit into a displayable format; a display unit electrically connected with the power source unit and displaying an image corresponding to a signal from the video signal processor; a light-emitting unit electrically connected with the power source unit and including at least two light sources; and a controller for judging an operating mode on the basis of a signal input from the signal input unit and controlling power supplied to the display unit and the light-emitting unit depending on the judged operating mode.

Claims

1. A display system comprising:

a power source to supply power;

a signal input circuit to receive signals;

a video signal processor to convert a format of video signals received from the signal input circuit into a displayable format;

a display electrically connected with the power source to display an image corresponding to a signal from the video signal processor;

a light emitter electrically connected with the power source and including at least two light sources; and

a controller to judge an operating mode based on a signal from the signal input circuit and to control power supplied to the display and the light emitter depending on the judged operating mode,

wherein the light emitter includes a plurality of light sources coupled to a supporter of the display and a cylindrical reflective body that reflects a light emitted from the light emitter, wherein the supporter includes a through hole, the cylindrical reflective body is disposed at a location adjacent to the through hole, and the plurality of light sources are disposed at an edge of the cylindrical reflective body,

wherein the controller changes a light-emitting pattern of the light sources based on the judged operating mode and one or more power commands,

wherein the operating mode includes a power-on mode and a power-off mode, wherein the power-on mode includes a normal mode, a power-saving mode, and a driving mode, and

wherein the normal mode is a mode during which both a color signal and a synchronization signal are received by the signal input circuit, the power-saving mode is a mode during which one of a color signal and a synchronization signal is not received by the signal input circuit, the driving mode is a mode in which the display starts to display a video when a power-on command is received and the driving mode is a mode that informs a user of the operating mode changes to the normal mode sequentially, and the power-off mode is a mode that does not supply to the display system, and

the controller gradually and periodically changes a brightness level of light emitted by the light emitter when the operating mode is the power saving mode.

2. The display system according to claim 1, wherein the light sources are arranged substantially in a ring.

3. The display system according to claim 1, wherein the supporter is a stand of the display.

4. The display system according to claim 1, wherein the controller variably controls power supplied to the light emitter according to the judged operating mode.

5. The display system according to claim 1, wherein the light sources are LEDs (light-emitting diodes).

6. The display system according to claim 1, wherein the controller judges whether a synchronization signal is received by the signal input circuit, and when there is no synchronization signal received by the signal input circuit for a predetermined time, the controller reduces power supplied to the display, and increases power of the light emitter.

7. The display system according to claim 1, wherein the operating mode is one of a normal mode during which both a color signal and a synchronization signal are received by the signal input circuit or a power-saving mode during which neither a color signal nor a synchronization signal is received by the signal input circuit with a predetermined period of time.

8. The display system according to claim 7, wherein the controller controls the light emitter to emit light at a brightness that increases from a reduced power state at a predetermined rate when the operating mode is judged to be a power-saving mode.

9. The display system according to claim 8, wherein the controller controls the brightness of light from the light emitter based on a repetition period that lies substantially in a range of 1.5-4 seconds.

10. The display system according to claim 7, wherein the controller controls the light emitter to emit light at a brightness that decreases from an on-state at a predetermined rate when the operating mode is judged to be a power-saving mode.

11. The display system according to claim 7, wherein the controller controls the light emitter to emit light at a brightness that increases and decreases with a predetermined period when the operating mode is judged to be a power-saving mode.

12. The display system according to claim 7, wherein the controller controls brightness of the light emitter in response to one of a PWM signal, a current amount, or a voltage level when the operating mode is judged to be a power-saving mode.

13. The display system according to claim 7, wherein the controller controls the light emitter to flicker with a predetermined period when the operating mode is judged to be a power-saving mode.

14. The display system according to claim 7, wherein the controller controls the light emitter to maintain a lighting state at a predetermined level when the operating mode is judged to be a normal mode.

23. The display system according to claim 6, wherein:

when there is no synchronization signal received by the signal input circuit for a predetermined time, the controller turns off power to the display and turns on power of the light emitter.

24. The display system according to claim 8, wherein the reduced power state is an off state.

15. A display system comprising:

a power source to supply supplying power;

a signal input circuit to receive signals;

a video signal processor to convert a format of video signals received from the signal input circuit into a displayable format;

a display to display an image corresponding to a signal from the video signal processor;

a light emitter that includes a plurality of light sources coupled to a supporter of the display and a cylindrical reflective body that reflects a light emitted from the light emitter, wherein the supporter includes a through hole, the cylindrical reflective body is disposed at a location adjacent to the through hole, and the plurality of light sources are disposed at an edge of the cylindrical reflective body;

a first controller to judge an operating mode based on a signal from the signal input circuit and to control power supplied to the display and the light emitter based on the judged operating mode;

a second controller to control supply of power to at least one of the light emitter or the display, wherein the first controller changes a light-emitting pattern of the light sources based on the judged operating mode and one or more power commands,

wherein the operating mode includes a power-on mode and a power-off mode, the power-on mode includes a normal mode, a power-saving mode, and a driving mode, and

wherein the normal mode is a mode during which both a color signal and a synchronization signal are received by the signal input circuit, the power-saving mode is a mode during which one of a color signal and a synchronization signal is not received by the signal input circuit, the driving mode is a mode in which the display starts to display a video when a power-on command is received and the driving mode is a mode that informs a user of the operating mode changes to the normal mode sequentially, and the power-off mode is a mode that does not supply to the display system, and

the first controller gradually and periodically changes a brightness level of light emitted by the light emitter when the operating mode is the power saving mode.

16. The display system according to claim 15, wherein the second controller comprises a brightness level adjustor to adjust a brightness level of the light emitter.

25. The display system according to claim 15, wherein the first controller changes the light-emitting pattern of the light sources based on said one or more power commands.

26. The display system according to claim 15, wherein the first controller changes the light-emitting pattern of the light sources based on the judged operating mode.

27. The display system according to claim 15, wherein the second controller turns off or turns on the supply of power to at least one of the light emitter or the display.

17. A method for controlling power of a display system, the method comprising:

judging an operating mode of a display system based on an input video signal;

changing, by a light emitter, a light-emitting pattern of light sources based on the judged operating mode and one or more power commands; and

when the operating mode is a power-saving mode, reducing power of a display of the display system and increasing power to a light emitter coupled to a support of the display,

wherein the operating mode includes a power-on mode and a power-off mode, the power-on mode includes a normal mode, a power-saving mode, and a driving mode, and

wherein the normal mode is a mode during which both a color signal and a synchronization signal are received by a signal input circuit, the power-saving mode is a mode during which one of a color signal and a synchronization signal is not received by the signal input circuit, the driving mode is a mode in which the display starts to display a video when a power-on command is received and the driving mode is a mode that informs a user of the operating mode changes to the normal mode sequentially, and the power-off mode is a mode that does not supply to the display system,

wherein the changing of the light-emitting pattern includes;

changing, gradually and periodically, a brightness level of light emitted by the light emitter when the operating mode is the power saving mode,

wherein the light emitter includes the light sources coupled to a supporter of the display and a cylindrical reflective body that reflects a light emitted from the light emitter,

wherein the supporter includes a through hole,

the cylindrical reflective body is disposed at a location adjacent to the through hole, and

the plurality of light sources are disposed at an edge of the cylindrical reflective body.

18. The method according to claim 17, wherein the judging of the operating mode comprises judging the operating mode depending on whether one of a synchronization signal or a color signal is received, and when a synchronization signal and a color signal is not received for a predetermined time, judging the operating mode to be the power-saving mode.

19. The method according to claim 18, further comprising, when the operating mode is judged to be the power-saving mode, variably supplying power to the light emitter.

20. The method according to claim 18, further comprising, when the operating mode is judged to be the power-saving mode, supplying power to cause the light emitter to flicker by a period of 1.5-4 seconds.

21. The display system according to claim 17, wherein the one or more power commands are user-initiated power commands.

22. The display system according to claim 17, wherein the one or more power commands include at least one of a first command to increase power or a second command to decrease power.

28. The method according to claim 17, wherein said reducing includes:

turning off power of the display and turning on power to the light emitter coupled to the support of the display when the operating mode is the power-saving mode.