Display device and related electronic device

• US 10,013,902 B2
• Filed: 06/20/2016
• Issued: 07/03/2018
• Est. Priority Date: 12/17/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Choi, Hak-Ki
• Primary Examiner(s): Lee, Gene W
• Application Number:
  US15/187,154
• Publication Number:
  US 20170178588A1
• Time in Patent Office: 743 Days
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• 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 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/34 by control of light from an independent source
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A display device may include a frequency detector, a control part, and a display panel. The frequency detector may receive an alternating current and may detect (and/or calculate) an alternating-current frequency associated with the alternating current. The control part may be electrically connected to the frequency detector and may generate a control signal using the alternating-current frequency. The display panel may be electrically connected to the control part and may display an image using the control signal.

Claims

1. A display device comprising:

a frequency detector configured to receive a first instance of an alternating current and configured to detect an alternating-current frequency associated with the alternating current;

a switching mode power supply circuit electrically connected to the frequency detector, configured to receive the first instance of the alternating current from the frequency detector, and configured to generate an output voltage associated with a direct current using the first instance of the alternating current;

a control part electrically connected to the frequency detector and configured to generate a control signal using the alternating-current frequency; and

a display panel electrically connected to the control part and configured to display an image using the control signal.

2. The display device of claim 1, wherein the control part is configured to determine a frame frequency based on the alternating-current frequency and is configured to generate the control signal using the frame frequency.

3. The display device of claim 2, wherein the control part is configured to set the frame frequency equal to a multiple of the alternating-current frequency.

4. The display device of claim 2, wherein the control part is configured to set the frame frequency equal to two times the alternating-current frequency.

5. The display device of claim 1,

wherein the control part comprises a storage device,

wherein the storage device stores alternating-current frequency values, frame frequency values that respectively correspond to the alternating-current frequency values, and corresponding relations between the alternating-current frequency values and frame frequency values,

wherein the alternating-current frequency values include the alternating-current frequency, and

wherein the frame frequency values include the frame frequency.

6. The display device of claim 1,

wherein the control part comprises a lookup table, wherein the lookup table stores alternating-current frequency values and stores frame frequency values that respectively correspond to the alternating-current frequency values,

wherein the alternating-current frequency values include the alternating-current frequency,

wherein the frame frequency values include the frame frequency, and

wherein the frame frequency corresponds to the alternating-current frequency according to the lookup table.

7. The display device of claim 1, wherein the display panel is electrically connected through the switching mode power supply circuit to the frequency detector.

8. The display device of claim 1 comprising:

a lighting device configured to receive a second instance of the alternating current, wherein the control part is configured to set a frame frequency equal to an operating frequency of the lighting device using the alternating-current frequency and is configured to generate the control signal using the frame frequency.

9. The display device of claim 1 comprising:

a lighting device configured to receive a second instance of the alternating current, wherein an operating frequency of the lighting device is equal to a multiple of the alternating-current frequency, and wherein the control part is configured to set a frame frequency equal to the multiple of the alternating-current frequency and is configured to generate the control signal using the frame frequency.

10. An electronic device comprising:

a power supply device configured to provide an alternating current;

a frequency detector electrically connected to the power supply device, configured to receive a first instance of the alternating current, and configured to detect an alternating-current frequency associated with the alternating current;

a switching mode power supply circuit electrically connected through the frequency detector to the power supply device, configured to receive the first instance of the alternating current from the frequency detector, and configured to generate an output voltage associated with a direct current using the first instance of the alternating current;

a control part electrically connected to the frequency detector and configured to generate a control signal using the alternating-current frequency; and

a display panel electrically connected to the control part and configured to display an image using the control signal.

11. The electronic device of claim 10, wherein the control part is configured to determine a frame frequency based on the alternating-current frequency and is configured to generate the control signal using the frame frequency.

12. The electronic device of claim 11, wherein the control part is configured to set the frame frequency equal to a multiple of the alternating-current frequency.

13. The electronic device of claim 11, wherein the control part is configured to set the frame frequency equal to two times the alternating-current frequency.

14. The electronic device of claim 10,

wherein the control part comprises a storage device,

wherein the storage device stores alternating-current frequency values, frame frequency values that respectively correspond to the alternating-current frequency values, and corresponding relations between the alternating-current frequency values and frame frequency values,

wherein the alternating-current frequency values include the alternating-current frequency, and

wherein the frame frequency values include the frame frequency.

15. The electronic device of claim 10, wherein the control part comprises a lookup table, wherein the lookup table stores alternating-current frequency values and stores frame frequency values that respectively correspond to the alternating-current frequency values, wherein the alternating-current frequency values include the alternating-current frequency, wherein the frame frequency values include the frame frequency, and wherein the frame frequency corresponds to the alternating-current frequency according to the lookup table.

16. The electronic device of claim 10, wherein the display panel is electrically connected through the switching mode power supply circuit to the frequency detector and is electrically connected through the switching mode power supply circuit and the frequency detector to the power supply device.

17. The electronic device of claim 10 comprising:

a lighting device electrically connected to the power supply device and configured to receive a second instance of the alternating current, wherein the control part is configured to set a frame frequency equal to an operating frequency of the lighting device using the alternating-current frequency and is configured to generate the control signal using the frame frequency.

18. The electronic device of claim 10 comprising:

a lighting device electrically connected to the power supply device and configured to receive a second instance of the alternating current, wherein an operating frequency of the lighting device is equal to a multiple of the alternating-current frequency, and wherein the control part is configured to set a frame frequency equal to the multiple of the alternating-current frequency and is configured to generate the control signal using the frame frequency.