Graphic display device

Abstract

The invention provides at low cost a graphic display device which can display video with a video signal in a predetermined format and includes an external input portion capable of having a signal other than the video signal in the predetermined format inputted thereto, where the graphic display device can notify a user in the case where an inputted video signal is in an unsupported format. A synchronizing signal is extracted by a video signal processing portion from a video signal inputted from an external input portion, and it is determined whether or not the video signal is in an unsupported format by a microcontroller so as to indicate that it is an unsupported signal on a display according to a determination result. It is thereby possible to realize the function just by handling of software of the microcontroller with no need to change a circuit configuration.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing an overview of a configuration of a CRT according to the present invention;

FIG. 2 is a flowchart showing an overview of an operation of the CRT according to the present invention;

FIG. 3 is a perspective view showing an appearance of the CRT (a state in which a DVD player as an external device is connected);

FIGS. 4A and 4B are diagrams showing examples of a display screen (warning display screen);

FIG. 5 is a flowchart showing an overview of a process for changing a setup of a function of a second embodiment according to the present invention;

FIGS. 6A and 6B are diagrams showing examples of the display screen (setup change screen);

FIG. 7 is a flowchart showing an overview of the operation of the CRT of the second embodiment according to the present invention; and

FIGS. 8A and 8B are diagrams showing examples of the display screen (warning display screen).

Claims

1. A graphic display device comprising: a display;a tuner portion for receiving a broadcast signal of each frequency;a received signal conversion portion for converting the broadcast signal inputted from the tuner portion into a video signal compliant with a predetermined format;an external input portion for inputting a signal from an external device;a video signal processing portion for displaying the video signal compliant with the predetermined format on the display, the video signal processing portion capable of extracting a synchronizing signal included in the video signal in the case where the video signal inputted from the received signal conversion portion or the external input portion is the signal compliant with the predetermined format; anda control portion, and characterized in that:a storage portion having warning information stored therein and an OSD generating portion are provided so that, in the case where the synchronizing signal extracted by the video signal processing portion is determined not to be the synchronizing signal compliant with the predetermined format by the control portion, a warning based on the warning information is displayed on the display by the OSD generating portion and the video signal processing portion.

2. The graphic display device according to claim 1, characterized in that the external input portion is a D video terminal or a component video terminal.

3. The graphic display device according to claim 1, characterized in that the predetermined format is a video format of 480i, and the video signal processing portion has a circuit configuration for displaying a video signal compliant with the video format of 480i on the display.

4. The graphic display device according to claim 1, characterized in that: the warning information includes a warning to the effect that “no video signal has been inputted to the external input portion, or a video signal not displayable on the device has been inputted to the external input portion” and a warning to the effect that “a video signal not displayable on the device has been inputted to the external input portion”;the warning based on the former warning information is displayed in the case where it is determined by the control portion that there is no synchronizing signal extracted by the video signal processing portion; andthe warning based on the latter warning information is displayed in the case where it is determined by the control portion that although there is the synchronizing signal extracted by the video signal processing portion, it is not the synchronizing signal compliant with the predetermined format.

5. The graphic display device according claim 1, further comprising: an operating portion as a user interface, and characterized in that:a warning erasure key is provided to the operating portion so as not to display the warning in the case where there is an input of the warning erasure key during display of the warning.

6. The graphic display device according to claim 1, further comprising: an operating portion as a user interface, and characterized in that:a reference parameter for determining whether or not the synchronizing signal extracted by the video signal processing portion is compliant with the predetermined format is stored in the storage portion; andif there is a setting change instruction to the operating portion from a user, the reference parameter is changed according to the instruction and stored in the storage portion.

7. The graphic display device according to claim 2, characterized in that the predetermined format is a video format of 480i, and the video signal processing portion has a circuit configuration for displaying a video signal compliant with the video format of 480i on the display.

8. The graphic display device according to claim 2, characterized in that: the warning information includes a warning to the effect that “no video signal has been inputted to the external input portion, or a video signal not displayable on the device has been inputted to the external input portion” and a warning to the effect that “a video signal not displayable on the device has been inputted to the external input portion”;the warning based on the former warning information is displayed in the case where it is determined by the control portion that there is no synchronizing signal extracted by the video signal processing portion; andthe warning based on the latter warning information is displayed in the case where it is determined by the control portion that although there is the synchronizing signal extracted by the video signal processing portion, it is not the synchronizing signal compliant with the predetermined format.

9. The graphic display device according to claim 3, characterized in that: the warning information includes a warning to the effect that “no video signal has been inputted to the external input portion, or a video signal not displayable on the device has been inputted to the external input portion” and a warning to the effect that “a video signal not displayable on the device has been inputted to the external input portion”;the warning based on the former warning information is displayed in the case where it is determined by the control portion that there is no synchronizing signal extracted by the video signal processing portion; andthe warning based on the latter warning information is displayed in the case where it is determined by the control portion that although there is the synchronizing signal extracted by the video signal processing portion, it is not the synchronizing signal compliant with the predetermined format.

10. The graphic display device according claim 2, further comprising: an operating portion as a user interface, and characterized in that:

11. The graphic display device according claim 3, further comprising: an operating portion as a user interface, and characterized in that:

12. The graphic display device according claim 4, further comprising: an operating portion as a user interface, and characterized in that:

13. The graphic display device according to claim 2, further comprising: an operating portion as a user interface, and characterized in that:a reference parameter for determining whether or not the synchronizing signal extracted by the video signal processing portion is compliant with the predetermined format is stored in the storage portion; and

14. The graphic display device according to claim 3, further comprising: an operating portion as a user interface, and characterized in that:a reference parameter for determining whether or not the synchronizing signal extracted by the video signal processing portion is compliant with the predetermined format is stored in the storage portion; andif there is a setting change instruction to the operating portion from a user, the reference parameter is changed according to the instruction and stored in the storage portion.

15. The graphic display device according to claim 4, further comprising: an operating portion as a user interface, and characterized in that:a reference parameter for determining whether or not the synchronizing signal extracted by the video signal processing portion is compliant with the predetermined format is stored in the storage portion; andif there is a setting change instruction to the operating portion from a user, the reference parameter is changed according to the instruction and stored in the storage portion.

16. The graphic display device according to claim 5, further comprising: an operating portion as a user interface, and characterized in that:a reference parameter for determining whether or not the synchronizing signal extracted by the video signal processing portion is compliant with the predetermined format is stored in the storage portion; andif there is a setting change instruction to the operating portion from a user, the reference parameter is changed according to the instruction and stored in the storage portion.