ELECTRONIC DEVICE, DISPLAY DEVICE, AND DISPLAY SYSTEM INCLUDING ELECTRONIC DEVICE AND DISPLAY DEVICE

• US 20180091770A1
• Filed: 09/27/2017
• Published: 03/29/2018
• Est. Priority Date: 09/27/2016
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: WON, Kang Young
• Granted Patent: US 10,462,418 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 31/2812 Checking for open circuits or shorts, e.g. solder bridges; Testing conductivity, resistivity or impedance of connections G01R31/66
• CPC Class Codes: G06F 2218/12 Classification; Matching
• CPC Class Codes: G09G 3/006 Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309
• CPC Class Codes: H04N 17/045 Self-contained testing apparatus
• CPC Class Codes: H04N 7/015 High-definition television systems
• CPC Class Codes: H04N 7/0357 for error detection or correction
• CPC Class Codes: H04N 7/102 Circuits therefor, e.g. noise reducers, equalisers, amplifiers H04N7/108 takes precedence

Abstract

An electronic device is provided. The electronic device may include a wired communication interface connected to a display device through a cable, and a controller that transmits a test signal, which includes specified data, to the display device through the wired communication interface and receives error check information regarding the test signal from the display device through the wired communication interface. The controller may sequentially change transmission characteristic values of the test signal within a specified range to transmit a plurality of test signals, and perform calibration for changing a transmission characteristic of a signal to be transmitted to the display device based on the error check information regarding the plurality of test signals.

Claims

1. An electronic device comprising:

a wired communication interface connected to a display device through a cable; and

a controller configured to transmit a test signal, which includes specified data, to the display device through the wired communication interface and receive error check information regarding the test signal from the display device through the wired communication interface,

wherein the controller is configured to;

sequentially change transmission characteristic values of the test signal within a specified range to transmit a plurality of test signals; and

perform calibration for changing a transmission characteristic of a signal to be transmitted to the display device based on the error check information regarding the plurality of test signals.

2. The electronic device of claim 1, wherein the transmission characteristic includes at least one of strength, pre-emphasis , a duty ratio, and skew of the signal.

3. The electronic device of claim 1, wherein the controller is configured to:

examine the error check information regarding the plurality of test signals to determine the transmission characteristic values of the signal within a specified error tolerance; and

select one of the determined transmission characteristic values of the signal.

4. The electronic device of claim 3, wherein the controller is configured to select a value, among the transmission characteristic values of the signal, that is closest to one of a mean value and a median value of the determined transmission characteristic values of the signal.

5. The electronic device of claim 1, wherein the controller is configured to generate the plurality of test signals for each frequency band and receive the error check information.

6. The electronic device of claim 1, wherein the controller is configured to generate the plurality of test signals for each line of the cable and receive the error check information.

7. The electronic device of claim 1, further comprising:

a printed circuit board (PCB) on which the wired communication interface and the controller are disposed,

wherein the controller is further configured to;

determine an impedance of the PCB; and

perform calibration for adjusting the impedance of the PCB if the determined impedance is different from a specified impedance.

8. The electronic device of claim 7, further comprising:

a conductive line pattern formed on the PCB;

a first resistor connected between a first end of the conductive line pattern of the PCB and a power supply; and

a second resistor connected between a second end of the conductive line pattern of the PCB and a ground,

wherein the controller is configured to;

measure a first voltage applied to at least one of the first resistor and the second resistor, and determine the impedance of the PCB to be different from the specified impedance if the first voltage is outside a specified voltage range.

9. The electronic device of claim 8, wherein the controller is configured to:

connect a variable resistor to at least one of the first resistor and the second resistor, sequentially change a resistance of the variable resistor, and measure second voltages across at least one of the first resistor and the second resistor; and

determine third voltages, which is within the specified range, among the second voltages, and select one of resistances corresponding to the third voltages.

10. The electronic device of claim 9, wherein the controller is configured to select a specific resistance, among the resistances corresponding to the third voltages, that is closest to one of a mean value and a median value of the resistances corresponding to the third voltages.

11. A display device comprising:

a wired communication interface connected to an electronic device through a cable; and

a controller configured to receive a test signal including specified data from the electronic device through the wired communication interface, examine the specified data, and check for an error in the test signal, and

wherein the controller is configured to;

sequentially change reception characteristic values of the test signal within a specified range to receive a plurality of test signals; and

perform calibration for changing a reception characteristic of a signal to be received from the electronic device based on error check information regarding the plurality of test signals.

12. The display device of claim 11, wherein the controller is configured to transmit the error check information regarding the plurality of test signals to the electronic device through the wired communication interface.

13. The display device of claim 11, wherein the reception characteristic is an equalizer value for processing the signal.

14. The display device of claim 11, wherein the controller is configured to:

examine the error check information regarding the plurality of test signals to determine reception characteristic values of the signal within a specified error tolerance; and

select one of the determined reception characteristic values of the signal.

15. The display device of claim 14, wherein the controller is configured to select a value, among the reception characteristic values of the signal, that is closest to one of a mean value and a median value of the determined reception characteristic values of the signal.

16. The display device of claim 12, further comprising:

a printed circuit board (PCB) on which the wired communication interface and the controller are disposed,

wherein the controller is further configured to;

determine an impedance of the PCB; and

perform calibration for adjusting the impedance of the PCB if the determined impedance is different from a specified impedance.

17. The display device of claim 16, further comprising:

a conductive line pattern formed on the PCB;

a first resistor connected between a first end of the conductive line pattern of the PCB and a power supply; and

a second resistor connected between a second end of the conductive line pattern of the PCB and a ground,

wherein the controller is configured to measure a first voltage applied to at least one of the first resistor and the second resistor, and determine the impedance of the PCB to be different from the specified impedance if the first voltage is outside a specified voltage range.

18. The display device of claim 17, wherein the controller is configured to:

connect a variable resistor to at least one of the first resistor and the second resistor, sequentially change a resistance of the variable resistor, and measure second voltages across at least one of the first resistor and the second resistor; and

determine third voltages, which is within the specified range, among the second voltages, and select one of resistances corresponding to the third voltages.

19. A display system comprising:

a display device; and

an electronic device connected with the display device through a cable to transmit a test signal including specified data to the display device, and to receive error check information regarding the test signal from the display device,

wherein the display device connected with the electronic device through the cable to receive the test signal including the specified data from the electronic device, and configured to examine the specified data to check for an error in the test signal, and to transmit the error check information regarding the test signal to the electronic device,

wherein the electronic device is configured to;

sequentially changes transmission characteristic values of the test signal within a first specified range to transmit a plurality of test signals; and

performs calibration for changing a transmission characteristic of a signal to be transmitted to the display device based on the error check information regarding the plurality of test signals, and

wherein the display device is configured to;

sequentially changes reception characteristic values of the test signal within a second specified range to receive the plurality of test signals; and

performs calibration for changing a reception characteristic of the signal received from the electronic device based on the error check information regarding the plurality of test signals.

20. The display system of claim 19, wherein the transmission characteristic includes at least one of strength, pre-emphasis, a duty ratio, and skew of the signal.