Control circuit and associated control method applied to digital visual interface

• US 10,147,389 B2
• Filed: 07/01/2016
• Issued: 12/04/2018
• Est. Priority Date: 07/20/2015
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MStar Semiconductor Incorporated (MediaTek, Inc.)
• Inventors: Liu, Ming-Ruei, Chiang, Dien-Shen
• Primary Examiner(s): Dharia, Prabodh M
• Application Number:
  US15/200,292
• Publication Number:
  US 20170025087A1
• Time in Patent Office: 886 Days
• Field of Search: 345 11, 345204, 345214, 710 62, 710316
• CPC Class Codes: G09G 2370/047 using display data channel standard [DDC] communication
• CPC Class Codes: G09G 2370/12 Use of DVI or HDMI protocol in interfaces along the display data pipeline
• CPC Class Codes: G09G 2370/22 Detection of presence or absence of input display information or of connection or disconnection of a corresponding information source
• CPC Class Codes: G09G 5/003 Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto specific for a CRT G09G1/165; for a flat panel G09G3/2092
• 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 control circuit applied to digital visual interface (DVI) includes a detecting circuit and a switching circuit. The detecting circuit detects a state of a predetermined pin of a DVI connector to generate a control signal. The switching circuit selectively connects a first pin and a second pin of the DVI connector to one a storage unit storing first identification data and a storage unit storing second identification data according to the control signal.

Claims

1. A control circuit applied to Digital Visual Interface (DVI), comprising:

a detecting circuit, detecting whether a state of a predetermined pin of a DVI connector is one of a floating state while connected to a DVI-A connecting cable and a grounded state while connected to a DVI-D connecting cable to generate a control signal; and

a switching circuit, selectively connecting a first pin and a second pin of the DVI connector to one of a first storage unit storing first identification data and a second storage unit storing second identification data according to the control signal;

wherein the first identification data is analog EDID and the second identification data is digital EDID;

wherein, when the detecting circuit detects that the predetermined pin is in the floating state, the switching circuit connects the first pin and the second pin of the DVI connector to the first storage unit according to the control signal; and

wherein, when the detecting circuit detects that the predetermined pin is in the grounded state, the switching circuit connects the first pin and the second pin of the DVI connector to the second storage unit according to the control signal.

2. The control circuit according to claim 1, wherein the DVI connector is a Digital Visual Interface Integrated (DVI-I) connector.

3. The control circuit according to claim 2, wherein in a predetermined condition, the switching circuit connects the first pin and the second pin of the DVI connector to the second storage unit.

4. The control circuit according to claim 1, wherein the DVI connector is a Digital Visual Interface Integrated (DVI-I) connector, and the predetermined pin is one of pins 3, 11, 19 and 22 of the DVI-I specification.

5. The control circuit according to claim 4, wherein the detecting circuit further detects a state of another predetermined pin of the DVI connector, and generates the control signal according to the state of the another predetermined pin;

the another predetermined pin is another one of the pins 3, 11, 19 and 22 of the DVI-I specification.

6. The control circuit according to claim 1, wherein the control circuit is located in a display device, and the DVI connector is disposed on the display device.

7. A control method applied to Digital Visual Interface (DVI), comprising:

detecting whether a state of a predetermined pin of a DVI connector is one of a floating state while connected to a DVI-A connecting cable and a grounded state while connected to a DVI-D connecting cable to generate a control signal; and

selectively connecting a first pin and a second pin of the DVI connector to one of a first storage unit storing first identification data and a second storage unit storing second identification data according to the control signal;

wherein the first identification data is analog EDID and the second identification data is digital EDID;

wherein, when it is detected that the predetermined pin is in the floating state, connecting the first pin and the second pin of the DVI connector to the first storage unit according to the control signal; and

when it is detected that the predetermined pin is in the grounded state, connecting the first pin and the second pin of the DVI connector to the second storage unit according to the control signal.

8. The control method according to claim 7, wherein the DVI connector is a Digital Visual Interface-Integrated (DVI-I) connector.

9. The control method according to claim 8, further comprising:

in a predetermined condition, connecting the first pin and the second pin of the DVI connector to the second storage unit.

10. The control method according to claim 7, wherein the DVI connector is a Digital Visual Interface-Integrated (DVI-I) connector, and the predetermined pin is one of pins 3, 11, 19 and 22 of the DVI-I specification.

11. The control method according to claim 10, further comprising:

detecting a state of another predetermined pin of the DVI connector, and generating the control signal according to the state of the another predetermined pin;

wherein, the another predetermined pin is another one of the pins 3, 11, 19 and 22 of the DVI-I specification.

12. The control method according to claim 7, applied to a display device, wherein the DVI connector is disposed on the display device.