System and method for authenticating a display panel in an information handling system

• US 8,674,901 B2
• Filed: 04/22/2009
• Issued: 03/18/2014
• Est. Priority Date: 04/22/2009
• Status: Active Grant

• Current Assignee: Dell Products LP (Dell Technologies Inc.)
• Original Assignee: Dell Products LP (Dell Technologies Inc.)
• Inventors: Goodart, Joseph E., Konetski, David S., Montag, Bruce C.
• Primary Examiner(s): ABDULSELAM, ABBAS I
• Application Number:
  US12/427,826
• Publication Number:
  US 20100271289A1
• Time in Patent Office: 1,791 Days
• Field of Search: 345/1.3, 345/3.1, 345/5, 715/734, 709/233
• US Class Current: 345/1.3
• CPC Class Codes: G06F 3/1431 using a single graphics controller
• CPC Class Codes: G09G 2370/047 using display data channel standard [DDC] communication
• 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

Abstract

A method includes determining if a display connection is in an information handling system, reading configuration information from a display, determining whether the configuration information identifies the display as an internal device, and training a data link. A memory includes code to perform a method of determining if a display connection is in an information handling system, reading configuration information from a display, determining if the configuration information identifies the display as an internal device, and training a data link. An information handling system includes a memory with code, a display, and a graphics processor that executes the code. The code operates to determine if a display connection is in the information handling system, read configuration information from the display, determine if the configuration information identifies the display as an internal device, and train a data link.

Claims

1. A computer-implemented method comprising:

determining whether a display connection in an information handling system is an internal display connection or an external display connection;

in response to determining that the display connection is an internal display connection, reading configuration information from a display device, the configuration information including timing and initialization parameters for a data link of the display connection;

determining whether the configuration information identifies the display device as an internal display device or an external display device; and

in response to determining that the configuration information identifies the display device is an internal display device, training the data link based on the timing and initialization parameters.

2. The computer-implemented method of claim 1, further comprising, in response to determining that the configuration information identifies the display device as an external display device, terminating the data link.

3. The computer-implemented method of claim 2, further comprising, in response to determining that the display connection is an external display connection, training the data link.

4. The computer-implemented method of claim 1, wherein the data link includes a main link and an auxiliary link.

5. The computer-implemented method of claim 4, wherein training the data link comprises:

sending link check information on the main link; and

receiving link check result information on the auxiliary link.

6. The computer-implemented method of claim 5, wherein the data link is a DisplayPort data link.

7. The computer-implemented method of claim 1, wherein the configuration information includes an Organizationally Unique Identifier.

8. The computer-implemented method of claim 7, wherein the Organizationally Unique Identifier identifies the display device as being a liquid crystal display.

9. A non-transitory memory for an information handling system, wherein the non-transitory memory has machine-executable code stored therein, and wherein the machine-executable code includes instructions for carrying out a method comprising:

determining that a first display connection in the information handling system is an internal display connection;

in response to determining that the first display connection is an internal display connection, reading configuration information from a display device, the configuration information including timing and initialization parameters for a first data link of the first display connection;

determining if the configuration information identifies the display device as an internal display device; and

when the configuration information identifies the display device is an internal display device, training the first data link based on the timing and initialization parameters.

10. The memory of claim 9, wherein the method further comprises:

determining that a second display connection in the information handling system is an external display connection; and

in response to determining that the second display connection is an external display connection, training a second data link of the second display connection.

11. The memory of claim 10, wherein the method further comprises, when the configuration information does not identify the display device as an internal display device, terminating the first data link.

12. The memory of claim 9, wherein training the first data link comprises:

sending link check information on a main link of the first data link; and

receiving link check result information on an auxiliary link of the first data link.

13. The memory of claim 12, wherein the data link is a DisplayPort data link.

14. The memory of claim 9, wherein the configuration information identifies the display device as being a liquid crystal display.

15. An information handling system comprising:

a memory having machine-executable code stored therein;

a display device; and

a graphics processor operable to execute the machine-executable code to;

determine whether a display connection in an information handling system is an internal display connection or an external display connection;

in response to determining that the display connection is an internal display connection, read configuration information from a display device, the configuration information including timing and initialization parameters for a data link of the display connection;

determine whether the configuration information identifies the display device as an internal display device or an external display device; and

when the configuration information identifies the display device is an internal display device, train the data link of the display connection based on the timing and initialization parameters.

16. The information handling system of claim 15, wherein, when the configuration information identifies the display device as an external display device, the graphics processor is further operable to terminate the data link.

17. The information handling system of claim 16, wherein, when the display connection is an external display connection, the graphics processor is further operable to train the data link.

18. The information handling system of claim 15, wherein, in training the first data link, the graphics processor is further operable to:

send link check information on a main link of the data link; and

receive link check result information on an auxiliary link of the data link.

19. The information handling system of claim 15, wherein the data link is a DisplayPort data link.

20. The information handling system of claim 15, wherein the configuration information identifies the display device as being a liquid crystal display.