DISPLAY APPARATUS

Abstract

A display apparatus, equipped with a common input terminal inputting different video signals, can discriminate the type of an input video signal entered from the common input terminal. The display apparatus includes an input terminal inputting different video signals. A synchronizing signal separation unit separates a synchronizing signal from a video signal entered from the input terminal. A frequency measurement unit measures a frequency of the synchronizing signal. An input signal discrimination unit discriminates the video signal entered from the input terminal based on a type of the synchronizing signal separated by the synchronizing signal separation unit and a measurement result obtained by the frequency measurement unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the invention and, together with the description, serve to explain the principles of the invention.

FIG. 1 is a block diagram illustrating am example projection display apparatus according to a first exemplary embodiment.

FIG. 2 illustrates an example input selection menu according to the first exemplary embodiment.

FIG. 3 illustrates an example signal timing table according to the first exemplary embodiment.

FIG. 4 is a flowchart illustrating an example input signal discrimination method according to the first exemplary embodiment.

FIG. 5 is a flowchart illustrating an example method for identifying VGA01 and 480p signals according to the first exemplary embodiment.

FIG. 6 is a block diagram illustrating an example projection display apparatus according to a second exemplary embodiment.

FIG. 7 illustrates an example input selection menu according to the second exemplary embodiment.

FIG. 8 is a flowchart illustrating an example input signal discrimination method according to the second exemplary embodiment.

FIG. 9 illustrates a conventional input selection menu.

Claims

1. A display apparatus comprising: an input terminal configured to input different video signals;a synchronizing signal separation unit configured to separate a synchronizing signal from a video signal entered from the input terminal;a frequency measurement unit configured to measure a frequency of the synchronizing signal; andan input signal discrimination unit configured to discriminate the video signal entered from the input terminal based on a type of the synchronizing signal separated by the synchronizing signal separation unit and a measurement result obtained by the frequency measurement unit.

2. The display apparatus according to claim 1, wherein the different video signals are an analog RGB signal and a component video signal.

3. The display apparatus according to claim 1, further comprising a memory configured to store synchronizing signal frequencies corresponding to standards of analog RGB signal and component video signal, wherein the input signal discrimination unit discriminates that the input signal is a component video signal when the synchronizing signal separated by the synchronizing signal separation unit is a sync on green signal and the measurement result obtained by the frequency measurement unit represents the synchronizing signal stored in the memory that corresponds to the standard of component video signal.

4. The display apparatus according to claim 1, further comprising a plurality of input terminals including the input terminal, wherein the display apparatus periodically detects whether the input video signal is input into each of plural input terminals.

5. The display apparatus according to claim 4, wherein the display apparatus shows a result of detecting whether the input video signal is input into each of plural input terminals.

6. A method performed in a display apparatus for discriminating an input signal when a common input terminal is used to input different video signals, wherein the display apparatus includes an input terminal configured to input different video signals; a synchronizing signal separation unit configured to separate a synchronizing signal from a video signal entered from the input terminal; a frequency measurement unit configured to measure a frequency of the synchronizing signal; and an input signal discrimination unit configured to discriminate the video signal entered from the input terminal based on a type of the synchronizing signal separated by the synchronizing signal separation unit and a measurement result obtained by the frequency measurement unit, the method comprising: receiving a video signal from the input terminal;separating the synchronizing signal from the video signal;measuring the frequency of the synchronizing signal; anddiscriminating the video signal on the type of synchronizing signal and the frequency measurement result.

7. The method according to claim 6, wherein the different video signals are an analog RGB signal and a component video signal.

8. The method according to claim 6, wherein the display apparatus further includes a memory configured to store synchronizing signal frequencies corresponding to standards of analog RGB signal and component video signal, the method further comprising: discriminating that the input signal is a component video signal when the synchronizing signal is a sync on green signal and the frequency measurement result represents the synchronizing signal stored in the memory that corresponds to the standard of component video signal.

9. A computer readable medium containing computer-executable instructions performed in a display apparatus for discriminating an input signal when a common input terminal is used to input different video signals, wherein the display apparatus includes an input terminal configured to input different video signals; a synchronizing signal separation unit configured to separate a synchronizing signal from a video signal entered from the input terminal; a frequency measurement unit configured to measure a frequency of the synchronizing signal; and an input signal discrimination unit configured to discriminate the video signal entered from the input terminal based on a type of the synchronizing signal separated by the synchronizing signal separation unit and a measurement result obtained by the frequency measurement unit, the computer readable medium comprising: computer-executable instructions for receiving a video signal from the input terminal;computer-executable instructions for separating the synchronizing signal from the video signal;computer-executable instructions for measuring the frequency of the synchronizing signal; andcomputer-executable instructions for discriminating the video signal based on the type of synchronizing signal and the frequency measurement result.

10. The medium according to claim 9, wherein the different video signals are an analog RGB signal and a component video signal.

11. The medium according to claim 9, wherein the display apparatus further includes a memory configured to store synchronizing signal frequencies corresponding to standards of analog RGB signal and component video signal, the medium further comprising: computer-executable instructions for discriminating that the input signal is a component video signal when the synchronizing signal is a sync on green signal and the frequency measurement result represents the synchronizing signal stored in the memory that corresponds to the standard of component video signal.