Display apparatus capable of image display for video signals of plural kinds
First Claim
1. A display apparatus for displaying an image of an input image signal, utilizing a clock signal which is phase synchronized with said input image signal, comprising:
- clock generating means including a phase comparator for comparing the phase of the synchronization signal in said input image signal with that of said clock signal and adapted for generating a clock signal which is phase synchronized with said input image signal;
display means for displaying the image represented by said input image signal, utilizing the clock signal generated by said clock generating means, with said display means having a plurality of display modes;
detection means for detecting the display mode of said display means corresponding to a state of said input image signal; and
control means for controlling the comparing operation of said phase comparator according to the display mode detected by said detection means.
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Abstract
In an apparatus for displaying the image of an input video signal, utilizing a clock signal which is phase synchronized with the input video signal, change in the state of the input video signal is made easily detectable. For this purpose there is disclosed a display apparatus provided with a clock generating circuit including a PLL circuit and adapted to generate a clock signal which is phase synchronized with the input video signal, and a display circuit for displaying the image relating to the input video signal utilizing the clock signal generated by the clock generating circuit. A detection circuit detects the state of the input video signal according to whether the PLL circuit is in the locked state.
83 Citations
36 Claims
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1. A display apparatus for displaying an image of an input image signal, utilizing a clock signal which is phase synchronized with said input image signal, comprising:
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clock generating means including a phase comparator for comparing the phase of the synchronization signal in said input image signal with that of said clock signal and adapted for generating a clock signal which is phase synchronized with said input image signal; display means for displaying the image represented by said input image signal, utilizing the clock signal generated by said clock generating means, with said display means having a plurality of display modes; detection means for detecting the display mode of said display means corresponding to a state of said input image signal; and control means for controlling the comparing operation of said phase comparator according to the display mode detected by said detection means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 34)
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11. A display apparatus for displaying an image of an input image signal, utilizing a clock signal which is phase synchronized with said input image signal, comprising:
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clock generating means including a PLL circuit and adapted for generating a clock signal which is phase synchronized with said input image signal, said clock generating means generating a control signal indicating whether said PLL circuit is in a locked state; display means for displaying the image represented by said input image signal, utilizing said clock signal generated by said clock generating means, with said display means having a plurality of display modes; and detection means for detecting the display mode of said display means corresponding to a state of said input image signal according to the control signal generated by said clock generating means. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 35)
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20. A display apparatus for displaying an image of an input image signal, utilizing a clock signal which is phase synchronized with said input image signal, comprising:
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clock generating means including a PLL circuit and adapted for generating a clock signal which is phase synchronized with said input image signal, said clock generating means generating a control signal indicating whether said PLL circuit is in a locked state, with said clock generating means having a plurality of operation modes; display means for displaying the image represented by said input image signal, utilizing said clock signal generated by said clock generating means, with said display means having a plurality of display modes; detection means for detecting the display mode of said display means corresponding to a state of said input image signal; and mode setting means for setting the operating mode of said clock generating means according to the control signal generated by said clock generating means and the display mode detected by said detection means. - View Dependent Claims (21, 22, 36)
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23. A signal processing apparatus comprising:
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input means for entering a video signal containing vertical synchronization signals and horizontal synchronization signals, with horizontal synchronization periods of said horizontal synchronization signals varying within one vertical synchronization period; synchronization signal detecting means for detecting, utilizing said input video signal, the horizontal synchronization periods of said input video signals and the timing of change of the horizontal synchronization periods in one vertical synchronization period; clock generating means for generating a clock signal which is phase synchronized with said horizontal synchronization signals; and control means for controlling a generating operation of said clock generating means according to a detection result of said synchronization signal detecting means. - View Dependent Claims (24)
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25. A display control apparatus for controlling a display device, comprising:
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input means for inputting an image signal; mode setting means for detecting a state of said input image signal and for setting a display mode of the display device between a plurality of display modes according to the detection result; clock generating means for generating a clock signal which is phase synchronized with said input image signal; control means for controlling a clock generating operation of said clock generating means according to the display mode set by said mode setting means; processing means for processing said input image signal according to the clock signal and supplying the processed image signal to said display device, said display device displaying an image represented by said image signal supplied from said processing means. - View Dependent Claims (26, 27, 28)
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29. A display control apparatus for controlling a display device, comprising:
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detection means for detecting a state of an input video signal; mode setting means for setting a display mode of said display device between n different display modes corresponding to different states of the input video signal on the basis of the detection results of said detection means, said mode setting means setting the display mode of said display device to be a predetermined display mode when the state of the input video signal detected by said detection means corresponds to a display mode other than the n different display modes; and processing means for processing the input video signal according to the display mode set by said mode setting means and for supplying the processed video signal to the display device, the display device displaying an image represented by the video signal supplied from said processing means. - View Dependent Claims (30, 31, 32, 33)
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Specification