Display system with single/dual image modes

• US 20010048482A1
• Filed: 05/31/2001
• Published: 12/06/2001
• Est. Priority Date: 05/31/2000
• Status: Active Grant

• Current Assignee: Pioneer Corporation
• Original Assignee: NEC Corporation
• Inventors: Takemoto, Naohiro
• Granted Patent: US 6,806,911 B2
• Time in Patent Office: Days
• US Class Current: 348/564
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/125 wherein one of the images is motion video
• CPC Class Codes: G09G 5/005 Adapting incoming signals to the display format of the display terminal
• CPC Class Codes: G09G 5/14 Display of multiple viewports
• CPC Class Codes: H04N 21/4316 for displaying supplemental content in a region of the screen, e.g. an advertisement in a separate window
• CPC Class Codes: H04N 21/485 End-user interface for client configuration
• CPC Class Codes: H04N 5/45 Picture in picture , e.g. displaying simultaneously another television channel in a region of the screen
• CPC Class Codes: H04N 5/46 for receiving on more than one standard at will deflecting circuits of multi-standard receivers H04N3/27
• CPC Class Codes: H04N 7/0122 the input and the output signals having different aspect ratios

Abstract

A display system is provided, which makes it possible to switch automatically from a single image mode to a dual image mode, and vice versa, without input of any switching signal. When an image displayed on the screen of the display device in the single image mode according to the first video input sent through the first input line, the first detector outputs the first detection signal. Thereafter, if the second detector detects the synchronizing signal of the second video input sent thorough the second input line, the second detector outputs the second detection signal This means that the switch receives both of the first and second detection signals in this state. As a result, the switch selects the dual image mode and accordingly, the two images are simultaneously displayed on the screen of the display device.

Claims

1. A display system comprising:

(a) a first detector for detecting a synchronizing signal of a first video input sent through a first input line;

the first detector outputting a first detection signal when the synchronizing signal of the first video input is detected;

(b) a second detector for detecting a synchronizing signal of a second video input sent through a second input line;

the second detector outputting a second detection signal when the synchronizing signal of the second video input is detected;

(c) a switch for selecting one of a single image mode and a dual image mode;

the switch selecting the single image mode when receiving one of the first detection signal outputted from the first detector and the second detection signal outputted from the second detector, thereby producing a first output signal;

the first output signal corresponding to the one of the first video input and the second video input received by the switch;

the switch selecting the dual image mode when receiving both of the first detection signal outputted from the first detector and the second detection signal outputted from the second detector, thereby producing a second output signal;

the second output signal corresponding to the both of the first video input and the second video input received by the switch; and

(d) a display device f or displaying an image according to the first or second video input on a screen in the single image mode and two images according to the first and second video inputs on the screen in the dual image mode.

2. The system according to

claim 1

, wherein each of the synchronizing signals of the first and second video inputs is a pulsed signal;

and wherein when the pulsed signal is not observed within a specific period of time, each of the first and second detectors judges that each of the first and second video inputs does not include the corresponding synchronizing signal.

3. The system according to

claim 1

, wherein each of the synchronizing signals of the first and second video inputs is a pulsed signal;

and wherein when the pulsed signal observed within a specific period of time has a frequency apart sufficiently from an available frequency of the display device, each of the first and second detectors judges that each of the first and second video inputs does not include the corresponding synchronizing signal.

4. A display system comprising:

(a) an input line selector for selecting two ones of n input lines as a first input line and a second input line, where n is an integer equal to or greater than 3;

(b) a first detector for detecting a synchronizing signal of a first video input sent through the first input line;

the first detector outputting a first detection signal when the synchronizing signal of the first video input is detected;

(c) a second detector for detecting a synchronizing signal of a second video input sent through the second input line;

the second detector outputting a second detection signal when the synchronizing signal of the second video input is detected;

(d) a switch for selecting one of a single image mode and a dual image mode;

the switch selecting the single image mode when receiving one of the first detection signal outputted from the first detector and the second detection signal outputted from the second detector, thereby producing a first output signal;

the first output signal corresponding to the one of the first video input and the second video input received by the switch;

the switch selecting the dual image mode when receiving both of the first detection signal outputted from the first detector and the second detection signal outputted from the second detector, thereby producing a second output signal;

the second output signal corresponding to the both of the first video input and the second video input received by the switch; and

(e) a display device for displaying an image according to the first or second vide input on a screen in the single image mode and two images according to the first and second vide inputs on the screen in the dual image mode.

5. The system according to

claim 4

, wherein each of the synchronizing signals of the first and second video inputs is a pulsed signal;

and wherein when the pulsed signal is not observed within a specific period of time, each of the first and second detectors judges that each of the first and second video inputs does not include the corresponding synchronizing signal.

6. The system according to

claim 4

, wherein each of the synchronizing signals of the first and second video inputs is a pulsed signal;

and wherein when the pulsed signal observed within a specific period of time has a frequency apart sufficiently from an available frequency of the display device, each of the first and second detectors judges that each of the first and second video inputs does not include the corresponding synchronizing signal.