JP2001352463A5 - Video display device - Google Patents

Claims (7)

In video display device provided with synchronous separation processor you output separates the synchronizing signal from an input signal the video signal and the synchronizing signal is synthesized, the synchronous separation processor,
A first synchronization separation processing unit which is supplied with a first input signal including a first video signal and a first synchronization signal, and separates and outputs the first synchronization signal from the first input signal ;
A second input signal comprising a second video signal and a second synchronization signal having a frequency different from the first synchronization signal is provided to separate the second synchronization signal from the second input signal. a second sync separation processing unit for outputting Te,
A detection unit that detects the state of the first and / or second synchronization signal output from the first and / or second synchronization separation processing unit ;
A switching unit for selecting and outputting any one of the first and second synchronization signals output from the first and second synchronization separation processing units;
A control unit configured to control the switching unit to obtain one of the first and second synchronization signals according to a detection result from the detection unit;
And an image display apparatus characterized by comprising: A first synchronization separation processing unit that separates and outputs a first synchronization signal from a first input signal, and a second synchronization separation processing unit that separates and outputs a second synchronization signal from a second input signal A detection unit for detecting the first and / or frequency, a first synchronization signal output from the synchronization separation processing unit, or the second synchronization output from the second synchronization separation processing unit A switching unit that switches and outputs a signal, and a control unit that controls the switching unit to output one of the first and second synchronization signals in response to a detection result from the detection unit; video display apparatus comprising: a. Wherein the detection unit includes a first detector for detecting the state of the first synchronizing signal separated by said first sync separator unit, of the second synchronizing signal separated by the second synchronous separation unit The image display apparatus according to claim 1 , further comprising: a second detection unit that detects a state. Before dangerous out portion, as the state before Symbol synchronization signal, the image display device according to claim 1, characterized in that detecting the frequency of the synchronizing signal. The control unit outputs the first synchronization signal output from the first synchronization separation processing unit when the frequency of the synchronization signal detected by the detection unit is equal to the frequency of the first synchronization signal. And controlling the switching unit, and the second synchronization output from the second synchronization separation processing unit when the frequency of the synchronization signal detected by the detection unit is equal to the frequency of the second synchronization signal. 5. The video display device according to claim 4, wherein the switching unit is controlled to output a signal. 3. The image display apparatus according to claim 1, wherein the control unit further controls a signal processing circuit or a deflection circuit which operates by receiving a synchronization signal output from the switching unit. 3. The synchronization separation processing apparatus according to claim 1, wherein the first and second synchronization separation processing units have different synchronization separation processing characteristics.