Electronic device and method of updating screen of display panel thereof

• US 9,837,044 B2
• Filed: 02/03/2016
• Issued: 12/05/2017
• Est. Priority Date: 03/18/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Jungbae
• Primary Examiner(s): NGUYEN, HAU H
• Application Number:
  US15/014,466
• Publication Number:
  US 20160275908A1
• Time in Patent Office: 671 Days
• CPC Class Codes: G06F 1/06 Clock generators producing several clock signals G06F1/08 - G06F1/14 take precedence
• CPC Class Codes: G06F 3/1423 controlling a plurality of local displays, e.g. CRT and flat panel display
• CPC Class Codes: G09G 2310/04 Partial updating of the display screen
• 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 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 2340/14 Solving problems related to the presentation of information to be displayed
• CPC Class Codes: G09G 2360/04 Display device controller operating with a plurality of display units
• 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: G09G 5/12 Synchronisation between the display unit and other units, e.g. other display units, video-disc players
• CPC Class Codes: G09G 5/18 Timing circuits for raster scan displays specially adapted for television H04N ; synchronisation between the display unit and other display units, videodisc player G09G5/12
• CPC Class Codes: G09G 5/363 Graphics controllers

Abstract

An electronic device is provided. The electronic device includes a first display panel including a first clock generator and that generates a first signal according to the first clock generator in response to a screen update request signal, a second display panel including a second clock generator and that generates a second signal according to the second clock generator in response to a screen update request signal, and a controller that transmits the screen update request signal to the first display panel and the second display panel and that receives the first signal and the second signal and that compares the first signal and the second signal to adjust a clock of at least one of the first clock generator and the second clock generator.

Claims

1. An electronic device, comprising:

a first display panel comprising a first clock generator and configured to generate a first signal according to the first clock generator in response to a screen update request signal;

a second display panel comprising a second clock generator and configured to generate a second signal according to the second clock generator in response to the screen update request signal; and

a controller configured to;

transmit the screen update request signal to the first display panel and the second display panel,

receive the first signal and the second signal,

calculate a deviation value between a first time that the first signal is received and a second time that the second signal is received, and

when the calculated deviation value is out of a predetermined range, transmit a clock control signal to at least one of the first display panel and the second display panel such that the deviation value is within the predetermined range.

2. The electronic device of claim 1,

wherein the electronic device further comprises an external clock generator, and

wherein the controller is further configured to:

deactivate the first clock generator and the second clock generator, and

control the first display panel and the second display panel to generate the first signal and the second signal according to the external clock generator.

3. The electronic device of claim 1, wherein the clock control signal is a signal that controls to reduce or increase a cycle of the clock.

4. The electronic device of claim 1, wherein the controller is further configured to transmit the clock control signal at a blanking or low power internal (BLLP) segment of the first display panel or the second display panel.

5. The electronic device of claim 1, wherein the controller is further configured to transmit the clock control signal at a random segment of the first display panel or the second display panel, when the first display panel and the second display panel comprise a shadow register.

6. The electronic device of claim 1, wherein the controller is further configured to transmit a control signal that turns off the first clock generator or the second clock generator to any one of the first display panel and the second display panel.

7. The electronic device of claim 6, wherein the controller is further configured to adjust a clock of a display panel that is not turned off to a predetermined value, when a clock generator of any one of the first display panel and the second display panel is turned off.

8. The electronic device of claim 7, wherein the controller is further configured to adjust a clock of a clock generator that is turned on based on the adjusted clock, when the clock generator that is turned off is turned-on.

9. The electronic device of claim 1, wherein the controller is further configured to adjust the clock by a proportional-integral-derivative (PID) control method.

10. An electronic device, comprising:

an external clock generator;

a first display panel configured to generate a first signal in response to a screen update request signal;

a second display panel configured to generate a second signal in response to the screen update request signal; and

a controller configured to;

transmit the screen update request signal to the first display panel and the second display panel,

control the first display panel and the second display panel to generate the first signal and the second signal according to the external clock generator,

calculate a deviation value between a first time that the first signal is received and a second time that the second signal is received, and

when the calculated deviation value is out of a predetermined range, transmit a clock control signal to the external clock generator such that the deviation value is within the predetermined range.

11. A method of updating a screen of a display panel in an electronic device comprising a first display panel comprising a first clock generator and a second display panel comprising a second clock generator, the method comprising:

transmitting, by a controller, a screen update request signal to the first display panel and the second display panel;

receiving, by the controller, a first signal generated according to the first clock generator from the first display panel;

receiving, by the controller, a second signal generated according to the second clock generator from the second display panel;

calculating a deviation value between a first time that the first signal is received and a second time that the second signal is receive; and

when the calculated deviation value is out of a predetermined range, adjusting a clock of at least one of the first clock generator and the second clock generator such that the deviation value is within the predetermined range.

12. The method of claim 11, further comprising:

deactivating, by the controller, the first clock generator and the second clock generator; and

controlling, by the controller, the first display panel and the second display panel to generate the first signal and the second signal according to an external clock generator included in the electronic device.

13. The method of claim 11, wherein the clock control signal is a signal that controls to reduce or increase a cycle of the clock.

14. The method of claim 11, wherein the transmitting of the clock control signal to at least one of the first display panel and the second display panel comprises:

transmitting the clock control signal at a blanking or low power internal (BLP) segment of the first display panel or the second display panel; and

transmitting the clock control signal at a random segment of a frame of the first display panel or the second display panel, when the first display panel and the second display panel comprise a shadow register.

15. The method of claim 11, further comprising transmitting, by the controller, a control signal that turns off the first clock generator or the second clock generator to any one of the first display panel and the second display panel.

16. The method of claim 15, further comprising adjusting a clock of a display panel that is not turned off to a predetermined value, when the first clock generator or the second clock generator is turned off.

17. The method of claim 16, wherein the adjusting of the clock of the display panel that is not turned off to a predetermined value comprises adjusting a clock of a clock generator that is turned on based on the adjusted clock, when the clock generator that is turned off is turned on.

18. The method of claim 11, wherein the adjusting of the clock of at least one of the first clock generator and the second clock generator comprises adjusting, by the controller of the electronic device, the clock by a proportional-integral-derivative (PID) control method.