Display device and automatic synchronization judging circuit

A display device comprising:

• an automatic synchronization judging circuit which judges a vertical synchronizing signal and a horizontal synchronizing signal as a reference signal for displaying operations when a data enable signal has not been input as the synchronizing signal, but when the vertical synchronizing signal and the horizontal synchronizing signal have been input, and which judges the data enable signal as the reference signal for the displaying operations when the data enable signal has been input as the synchronizing signal, even if either of the vertical synchronizing signal or the horizontal synchronizing signal, or both of the vertical synchronizing signal and the horizontal synchronizing signal have been input or have not been input as the synchronizing signal, whereby a result of the judgment is output as a judging signal.

An automatic synchronization judging circuit so configured as to judge a vertical synchronizing signal and a horizontal synchronizing signal as a reference signal for displaying operations when a data enable signal has not been input or even if the data enable signal has been input, when a count value of the input data enable signal has not reached a predetermined value, and to judge the data enable signal as the reference signal for the displaying operations when the count value of the input data enable signal has reached the predetermined value, whereby a result of the judgment is output as a judging signal.

An automatic synchronization judging circuit so configures as to judge a vertical synchronizing signal and a horizontal synchronizing signal as a reference signal for displaying operations when a data enable signal has not been input as the synchronizing signal, but when the vertical synchronizing signal and the horizontal synchronizing signal have been input, and as to judge the data enable signal as the reference signal for the displaying operations when the data enable signal has been input as the synchronizing signal, even if either of the vertical synchronizing signal or the horizontal synchronizing signal, or both of the vertical synchronizing signal and the horizontal synchronizing signal have been input or have not been input as the synchronizing signal, whereby a result of the judgment is output as a judging signal.

A display device comprising:

• an automatic synchronization judging means which judges a vertical synchronizing signal and a horizontal synchronizing signal as a reference signal for displaying operations when a data enable signal has not been input or even if the data enable signal has been input, when a count value of the input data enable signal has not reached a predetermined value, and which judges the data enable signal as the reference signal for the displaying operations when the count value of the input data enable signal has reached the predetermined value, whereby a result of the judgment is output as a judging signal.

A display device comprising:

• an automatic synchronization judging means which judges a vertical synchronizing signal and a horizontal synchronizing signal as a reference signal for displaying operations when a data enable signal has not been input as the synchronizing signal, but when the vertical synchronizing signal and the horizontal synchronizing signal have been input, and which judges the data enable signal as the reference signal for the displaying operations when the data enable signal has been input as the synchronizing signal, even if either of the vertical synchronizing signal or the horizontal synchronizing signal, or both of the vertical synchronizing signal and the horizontal synchronizing signal have been input or have not been input as the synchronizing signal, whereby a result of the judgment is output as a judging signal.