METHOD OF TRANSFERRING DATA IN A DISPLAY DEVICE

• US 20130113777A1
• Filed: 02/10/2012
• Published: 05/09/2013
• Est. Priority Date: 11/09/2011
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Baek, Dong-Hoon, Lee, Jae-Youl, Lee, Dong-Myung, Pae, Han-Su
• Application Number:
  US13/370,810
• Publication Number:
  US 20130113777A1
• Time in Patent Office: Days
• US Class Current: 345/212
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• CPC Class Codes: G09G 2330/12 Test circuits or failure detection circuits included in a display system, as permanent part thereof
• CPC Class Codes: G09G 2370/08 Details of image data interface between the display device controller and the data line driver circuit
• 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 5/008 Clock recovery

Abstract

A method of transferring data between a timing controller and a plurality of source drivers in a display device is disclosed. The method includes: (a) setting a first source driver of the plurality of source drivers to convert first signals having first voltage levels to second signals having second voltage levels; (b) receiving, by the first source driver, a first test pattern from the timing controller; (c) performing a test by the first source driver, based on the first test pattern, to determine whether an error has occurred in the first test pattern; and (d) when an error has occurred in the first test pattern, adjusting, by the first source driver, an output level of a receiver of the first source driver, so that the first source driver converts the first signals to third signals having third voltage levels different from the second voltage levels.

Claims

1. A method of transferring data between a timing controller and a plurality of source drivers in a display device, the method including:

(a) setting a first source driver of the plurality of source drivers to convert first signals received from outside of the first source driver and having first voltage levels to second signals having second voltage levels;

(b) receiving, by the first source driver, a first test pattern from the timing controller;

(c) performing a test by the first source driver, based on the first test pattern, to determine whether an error has occurred in the first test pattern received at the first source driver; and

(d) when an error has occurred in the first test pattern received at the first source driver, adjusting, by the first source driver, an output level of a receiver of the first source driver, so that the first source driver converts the first signals to third signals having third voltage levels different from the second voltage levels.

2. The method of claim 1, wherein performing the test to determine whether an error has occurred includes comparing a voltage level of a signal output from a receiver of the first source driver to a reference voltage level.

3. The method of claim 2, wherein an error is determined to have occurred when the voltage level of the signal output from the receiver is lower than the reference voltage level.

4. The method of claim 1, further comprising:

receiving the first test pattern by the first source driver during an initialization period for the display device.

5. The method of claim 1, further comprising:

receiving the first test pattern by the first source driver during an vertical blank period for the display device.

6. The method of claim 1, further comprising:

(e) setting a second source driver of the plurality of source drivers to convert fourth signals received from outside of the second source driver and having fourth voltage levels to fifth signals having fifth voltage levels;

(f) receiving, by the second source driver, a second test pattern from the timing controller;

(g) performing a test by the second source driver, based on the second test pattern received at the second source driver, to determine whether an error has occurred in the second test pattern received at the second source driver; and

(h) when an error has occurred in the second test pattern received at the second source driver, adjusting, by the second source driver, an output level of a receiver of the second source driver, so that the second source driver converts the fourth signals to sixth signals having sixth voltage levels different from the fifth voltage levels.

7. The method of claim 6, wherein steps (c) and (d) are performed independently of steps (g) and (h).

8. The method of claim 1, further comprising:

repeating steps (b) through (d) for a third test pattern after the output level of the receiver of the source driver has been adjusted; and

continuing to repeat steps (b) through (d) for subsequent test patterns until the source driver determines that no error has occurred in a tested test pattern.

9. The method of claim 1, further comprising:

prior to step (a), performing a test by the first source driver to determine whether an error has occurred in an additional test pattern received at the first source driver; and

if an error has not occurred, performing step (a) by decreasing the output level of the receiver of the first source device.

10. The method of claim 9, further comprising:

repeating steps (b) through (d) for a third test pattern after the output level of the receiver of the source driver has been adjusted; and

continuing to repeat steps (b) through (d) for subsequent test patterns until the source driver determines that no error has occurred in a tested test pattern.

11. A method of transferring data between a timing controller and a plurality of source drivers in a display device, the method including:

(a) receiving, by a first source driver of the plurality of source drivers, a first test signal;

(b) converting, by the first source driver, the first test signal to a first TTL level signal;

(c) performing, by the first source driver, error checking for the first TTL level signal;

(d) if it is determined that an error has occurred, adjusting settings of the first source driver; and

(e) repeating steps (a) through (d) until it is determined that no error has occurred.

12. The method of claim 11, wherein step (c) includes determining whether the first TTL level signal has a voltage level below a reference voltage level.

13. The method of claim 12, wherein step (d) includes adjusting settings of the first source driver to cause a TTL level signal output from a receiver of the first source driver to have a voltage level higher than a voltage level of the first TTL level signal.

14. The method of claim 11, further comprising:

(f) receiving, by a second source driver of the plurality of source drivers, a second test signal;

(g) converting, by the second source driver, the second test signal to a second TTL level signal;

(h) performing, by the second source driver, error checking for the second TTL level signal;

(i) if it is determined that an error has occurred, adjusting settings of the second source driver; and

(j) repeating steps (f) through (i) until it is determined that no error has occurred.

15. A display device comprising:

a timing controller; and

a plurality of source drivers, wherein a first source driver of the plurality of source drivers includes;

a first receiver configured to receive a first test pattern from the timing controller; and

a first error check unit configured to perform a test, based on the first test pattern, to determine whether an error has occurred in the first test pattern,

wherein the first source driver is configured to adjust an output level of the first receiver when it is determined that an error has occurred in the first test pattern, so that signals output from the first receiver have different voltage levels after the adjustment than prior to the adjustment.

16. The display device of claim 15, wherein the first source driver is configured to change settings associated with the receiver to increase the output level of the first receiver when it is determined that an error has occurred in the first test pattern.

17. The display device of claim 15, wherein the first error check unit is further configured to send a ready signal to the timing controller after it is determined that no error has occurred in the first test pattern.

18. The display device of claim 15, wherein a second source driver of the plurality of source drivers includes:

a second receiver configured to receive a second test pattern from the timing controller; and

a second error check unit configured to perform a test, based on the second test pattern, to determine whether an error has occurred in the second test pattern,

wherein the second source driver is configured to adjust an output level of the second receiver, independently of the first source driver, when it is determined that an error has occurred in the second test pattern, so that signals output from the second receiver have different voltage levels after the adjustment than prior to the adjustment.

19. The display device of claim 18, wherein:

the first error check unit is further configured to send a first ready signal to the timing controller after it is determined that no error has occurred in the first test pattern;

the second error check unit is further configured to send a second ready signal to the timing controller after it is determined that no error has occurred in the second test pattern.

20. The display device of claim 19, further comprising:

a first signal path between the timing controller and the first source driver, wherein the timing controller is configured to transmit the first test pattern to the first source driver over the first signal path;

a second signal path between the timing controller and the second source driver, the second signal path different from the first signal path, wherein the timing controller is configured to transmit the second test pattern to the second source driver over the second signal path; and

a third common signal path different from the first signal path and second signal path, wherein both the first source driver and second source driver are configured to send ready signals to the timing controller over the third common signal path.