KR20050120042A - Method for controlling non-signal of pdp tv - Google Patents

Abstract

The present invention discloses a method for controlling no signal processing of a PDTV.

According to the present invention, there is provided a color signal decoder for generating R, G, and B data by reconstructing a color signal from a composite video signal, and extracting a vertical synchronization signal and a horizontal synchronization signal of the composite video signal; An AD converter for converting and outputting a video signal corresponding to an R / G / B signal provided from a color signal decoder into a digital signal; A data processor configured to perform sampling by a predetermined sampling clock and convert the data output from the AD converter to digital image data so as to be rearranged and reconstructed on a PDP; A phase lock loop (PLL) for extracting a dot clock from horizontal and vertical synchronization signals provided by a color signal decoder and providing the same to the data processor for use as a sampling clock; A vertical synchronization counter for extracting the vertical synchronization signal from the color signal decoder and counting the vertical synchronization signal; A horizontal synchronization counter for extracting the horizontal synchronization signal from the color signal decoder and counting the horizontal synchronization signal; And based on the count information of the vertical sync counter or the count information of the horizontal sync counter to determine that there is no signal of the composite video signal, and generates a random control cycle signal corresponding to the horizontal sync or vertical sync signal in the non-signal state. The control unit is configured to control a fade out of a video signal displayed on a PDP by counting a non-signal state for a predetermined time.

Therefore, in the present invention, it is determined whether the composite video signal is in the no signal state or the error state of the video signal based on the vertical synchronization signal or the horizontal synchronization signal separated from the color signal decoder. After the set time, the displayed video signal is faded out to obtain an effect of removing the discomfort of the viewer. In addition, when the fade out mode is activated according to the present invention, the fade out is performed gradually for a predetermined time, and the user provides a guide message when the fade out mode is started to the OSD to recognize the operation of the system. By doing so, it provides the effect of increasing the completeness of the system. In addition, by stopping the random control cycle signal for image data processing at the end of the fade out mode according to the present invention, it is possible to secure the stability of the system by preventing the instability such as the shaking of the image from the clock signal of the asynchronous state Provide the effect.

Description

No signal processing control method of PDTV {METHOD FOR CONTROLLING NON-SIGNAL OF PDP TV}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to video processing of televisions, and more particularly to signalless processing of PDTVs for detecting no signals from synchronization signals of composite video signals and removing video and audio signals in response to the detected no signals. It relates to a control method.

In general, a PDP is a flat panel display device using a penning mixed gas for a discharge phenomenon, that is, covering a gas based on a neon or helium (He) gas having a relatively high air pressure (over 100 Torr) by a dielectric. It refers to a display device using a light emitting phenomenon caused by the discharge between the narrow electrodes, and essentially has a performance suitable for computer terminals, educational systems, etc., and has been practically used as a computer display.

The penning gas is mainly Ne + Xe, Ne + He + Xe, and the reason for using such a mixed gas is that the discharge start voltage can be lowered when the mixed gas is more than one gas component. The discharge start voltage depends on the type of gas, the fanning gas pressure, and the structure and shape of the panel. The display panel having such a structure displays the video information of the composite video signal by digitally controlling the pixels composed of a plurality of pixels and applying a predetermined voltage across the panel.

The PDP television having the digital display control receives a vertical synchronous signal and a horizontal synchronous signal including a video and audio signal through a tuner, separates the video signal and the audio signal through color signal decoding, and phase-locks a loop. Vertical synchronization and horizontal synchronization signals are extracted by the PLL, and display control of image data is performed in response to the vertical synchronization signal and the horizontal synchronization signal. Here, display control is performed by a microcomputer, and the microcomputer programs a control cycle to properly process the sync signal included in the television signal to generate the entire drive signal and the control signal. 3 seconds after the vertical synchronization signal is input, a control signal for controlling the scan voltage supply is generated, 5 seconds after the vertical synchronization signal is input, a control signal for controlling the address voltage supply is generated, and a vertical synchronization signal is inputted 10 After a second, a sustain voltage supply control signal is generated.

Therefore, the microcomputer continuously detects the vertical synchronization signal and the horizontal synchronization signal, but generates a pre-programmed pulse signal when the synchronization signal is not input for a predetermined time to perform stable control of the system. However, when there is no signal input without horizontal and vertical synchronization signals, a random control signal is output by the programmed control cycle of the microcomputer, which may cause malfunction of the entire circuit. There is a problem in that an abnormality in the power supplied to the PDP) occurs and damages the circuit. In order to overcome this problem, when no signal video signal is input to the PDTV, that is, when there is no synchronization signal, a method for turning off the system after a predetermined time has been sought. In case of inputting video signal, inconvenience of having to turn on the system power of PDTV manually occurs.

The present invention has been made to solve the above problems, and an object of the present invention is to recognize a non-signal state based on the presence or absence of a synchronization signal provided from a composite video signal, and to fade out video and audio in the non-signal state. The present invention provides a method of controlling a signalless process of a PDTV television to fade out and suppress unnecessary display or display errors.

In addition, another object of the present invention is to provide a signal-free control method of a PDTV that can protect the internal circuit of the system by blocking the random control cycle signal of the microcomputer upon detection of the non-signal state based on the presence or absence of the synchronization signal have.

In addition, another object of the present invention is to remove the fade-out mode when the synchronization signal is input in the fade-out state of the image data and audio data, and to receive the normal video and audio signal to restore the system of the original The present invention provides a method for controlling a no-signal processing of a television.

In order to achieve the above object, an apparatus for processing a signal of a PDTV television according to the first aspect of the present invention is an apparatus for signalless processing of a PDDP television. A color signal decoder for generating B data and extracting a vertical synchronization signal and a horizontal synchronization signal of the composite video signal; An AD converter for converting and outputting a video signal corresponding to an R / G / B signal provided by the color signal decoder into a digital signal; A data processor configured to perform sampling by a predetermined sampling clock and convert the data output from the AD converter to digital image data so as to be rearranged and reconstructed on a PDP; A phase lock loop (PLL) for extracting a dot clock from horizontal and vertical synchronization signals provided by the color signal decoder and providing the dot clock to the data processor for use as a sampling clock; A vertical synchronization counter for extracting a vertical synchronization signal from the color signal decoder and counting the vertical synchronization signal; A horizontal synchronous counter for extracting a horizontal synchronous signal from the color signal decoder and counting the horizontal synchronous signal; And determining that there is no signal state of the composite video signal based on the count information of the vertical synchronization counter or the count information of the horizontal synchronization counter, and generating a random control cycle signal corresponding to the horizontal synchronization or vertical synchronization signal in the no signal state. At the same time, the control unit is configured to control a fade out of the video signal displayed on the PDDP by counting a no signal state for a predetermined time.

According to a preferred embodiment of the present invention, the input port of the controller is characterized in that it further comprises a data input unit for performing the time control of the fade out mode in conjunction with the key button of the PDP television.

In addition, the control unit provides the non-signal state of the composite video signal as textual information during fade out control according to the no-signal input. A mixer may be further included for mixing and outputting corresponding OSD signals.

On the other hand, in order to achieve the above object, a method for controlling a signal of a PDTV television according to the second aspect of the present invention is a control method for signalless processing of a PDDP television, including: a) a vertical synchronization signal from a composite video signal; Or determining whether a horizontal synchronization signal exists; b) when the vertical synchronization signal or the horizontal synchronization signal is present, displaying image data of the composite video signal on the PDTV, and counting for a predetermined time when the vertical synchronization signal or the horizontal synchronization signal does not exist. step; And c) fading out the image data within the predetermined time and feeding back to the b) step.

According to a preferred embodiment of the present invention, after step b), the step b-1) outputting a guide message for recognizing a fade-out function of the image data to the ODD during the execution of a count of a predetermined time is performed. It is characterized in that it is further included.

Hereinafter, a non-signal processing apparatus and a control method of a PDTV according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram for explaining the main functions of the PDTV according to the present invention. As shown, the color signal decoder 101 for restoring the color signal from the composite video signal to generate R, G, B data, and extracting the vertical synchronization signal and the horizontal synchronization signal of the composite video signal, and the absence of the composite video signal. The mixer 103 and the mixer 103 for mixing and outputting an R / G / B signal provided by the color signal decoder 101 and an OSD signal corresponding to the text information to provide a signal state as textual information. An AD converter (105) for converting and outputting a video signal mixed with R / G / B signals and text information provided by a digital signal, and the data output from the AD converter 105 on the PDDP (PDP) Horizontal and vertical synchronization provided by the data processor 107 and the color signal decoder 101 for performing sampling by a predetermined sampling clock to be rearranged and reconstructed so as to convert the image into digital image data. A phase lock loop (PLL: 109) for extracting a dot clock from a call and providing it to the data processor 107 for use as a sampling clock, and a vertical sync signal from the color signal decoder 101. A vertical synchronous counter 111 for extracting and counting the horizontal synchronization signal, a horizontal synchronous counter 113 for extracting and counting a horizontal synchronous signal from the color signal decoder 101, coefficient information of the vertical synchronous counter 111, or Based on the count information of the horizontal synchronization counter 113, it is determined that the composite video signal is in the no signal state, and generates a random control cycle signal corresponding to the horizontal synchronous or vertical synchronization signal at the time of no signal, and simultaneously generates a no signal state. The controller 115 is configured to control a fade out of a video signal which is counted for a predetermined time and displayed on a PDP.

A data input unit 117 is connected to an input port of the control unit 115 to perform time control of the fade out mode in association with a key button of a PDP television. In addition, the controller 115 extracts OSD (OSD) information according to the fade-out start from the internal memory in the no signal state to the mixer 103, so that the user can recognize the fade-out mode. . In addition, the control unit 115 blocks the control cycle signal at the start of the fade out mode to stabilize the system of the PDTV.

On the other hand, the fade out mode blocks the video signal after the set time elapses from the data input unit 117, but controlling the luminance level of the video signal to gradually fade out during the set time will not depart from the gist of the present invention. That is, when the controller 115 recognizes the current non-signal state, the screen protection function may be performed by gradually lowering the luminance level of the image signal during the preset fade out time. As shown in FIG. 2, the luminance level of the same period is reduced in response to the fade out setting times T1, T2, and T3 set by the user through the data input unit 117. For example, if a gradual level reduction is performed by dividing the luminance level into ten stages, the luminance level divided into ten stages is reduced during the set time of T1, and if the set time is adjusted to T2, the luminance level of ten stages during T2 time To gradually fade out.

Hereinafter, the operation of the present invention will be described.

3 is a flowchart for explaining the main operation of the present invention. As shown, the system enters an initial state in which the system power of the PDTV is supplied at step S301, and the control unit 115 holds setting time information provided from the data input unit 117. FIG. Based on the system power supply, the tuner of the PDTV receives the composite video signal, and the color signal decoder 101 restores the color signal from the input composite video signal and provides R, G, and B data to the mixer 103.

In addition, the color signal decoder 101 transmits the vertical and horizontal synchronization signals of the composite video signal to the vertical synchronization counter 111 and the horizontal synchronization counter 113, and the control unit 115 is the phase synchronization loop 109 and A clock is generated by a clock generation circuit (not shown) provided therein to provide an R / G / B signal to the mixer 103 based on the generated clock. In this case, when a separate OSD signal is not generated, an RGB image signal provided from the color signal decoder 101 is provided to the AD converter 105 and an image provided through the AD converter 105. The data is provided to the data processor 107.

The data processing unit 107 is an output signal of the phase synchronization loop 109 for generating a dot clock from the horizontal and vertical synchronization signals provided from the color signal decoder 101 and the horizontal and output signals from the control unit 115. Based on the vertical signal, the image data output from the AD converter 105 is rearranged and reconstructed and displayed on the PDDP.

On the other hand, when the composite video signal inputted to the color signal decoder 101 in step S303 is no signal, that is, when there is no video signal or an image reception error in which there is no vertical synchronization signal or horizontal synchronization signal, the phase synchronization loop ( 109 does not receive a synchronization signal from the color signal decoder 101 and thus cannot transmit a dot clock signal to the data processor 107. In addition, since the vertical synchronization counter 1110 or the horizontal synchronization counter 113 does not generate the counting signal of the vertical synchronization signal and the horizontal synchronization signal, the controller 115 may not generate an error or no signal of the currently input composite video signal. Recognize that

At this time, the controller 115 enters the step S307 to activate the fade out mode function corresponding to the no-signal input. This implements an OSD output for displaying a guidance message according to the fade out mode entry on the PDDP for a predetermined time from the data input unit 117. That is, in step S309, the control unit 115 generates a random control cycle signal and supplies it to the data processing unit 107, and in step S311 generates a guide message according to the fade out mode entry into the OSD. It is supplied to the mixer 103.

The mixer 103 mixes the R / G / B signal provided from the color signal decoder 101 and the OSD signal provided from the controller 115 to provide the AD converter 105. The AD converter 105 supplies the data processor 107 with a mixed signal of the R / G / B signal and the OSD signal provided from the mixer 103, and the data processor 107 is generated by the controller 115. The video signal is rearranged and reconstructed based on a predetermined sampling clock corresponding to the control cycle signal. The rearranged and reconstructed video signal is displayed on the PDDP.

In addition, the control unit 115 proceeds to step S313 to calculate the brightness level reduction period inversely proportional to the preset set count. This decreases the luminance of the image signal displayed on the PDP, that is, the composite image signal including the OSD signal, in a predetermined step to perform a progressive fade out. For example, when the user sets the fade out setting time according to the non-signal input to 1 second through the data input unit 117, and when the brightness reduction step of the video signal is set to 10 steps, the control unit 115 performs no signal. After recognizing the input, the brightness level is decreased by 0.1 by 0.1 second. Of course, when the fade out setting time is set to 2 seconds, it is natural to decrease the brightness level of the video signal by 0.1 by 0.2 seconds.

Therefore, the image displayed by the PDDP performs a gradual fade out by decreasing the luminance level during the setting count from the input of the no-signal image. Of course, it includes an OSD video. Thereafter, the control unit 115 proceeds to the process by feeding back to step S307, and when the count of the preset count is terminated in step S307, the control unit 115 enters step S315.

This is a time point at which the fade out is actually finished, the control unit 315 ends the generation of the control cycle signal, and the data processing unit 107 blocks the image displayed on the PDP due to the blocking of the control cycle signal. Here, according to another embodiment of the present invention, the gradual fade out of the video signal during the set count may perform a fade out of the video signal after the set count. That is, the luminance level of the video signal is varied so that the video signal currently displayed is blocked when the preset time elapses without gradually fading out. At this time, the OSD image may be displayed as the fade-out mode is entered during the set time, and the message may be output to recognize that the image is blocked after the set time.

Thereafter, the control unit 115 enters step S319 to maintain the system standby state and feeds back to step S303. As the control unit 115 repeats the process in step S303, the control unit 115 maintains a fade out state and detects a synchronization signal of the continuous composite image signal from the vertical synchronization counter 111 and the horizontal synchronization counter 113.

While the display 115 of the PDTV maintains a fade out state, when the control unit 115 recognizes that the synchronization signal is introduced from the vertical synchronization counter 111 and the horizontal synchronization counter 113, it performs an initialization mode of the system. After receiving and displaying the current composite video signal to exit the fade out mode.

What has been described above is only an embodiment of a signal-free processing apparatus and control method of a PDTV according to the present invention, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, Without departing from the gist of the present invention, one of ordinary skill in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

As described above, the method for controlling no signal processing of a PDTV according to the present invention determines whether there is no signal state or an error state of a video signal based on a vertical sync signal or a horizontal sync signal separated from a color signal decoder. In the case of no signal or an error state of the video signal, the discomfort of the viewer can be eliminated by fading out the displayed video signal after a preset time.

In addition, when the fade out mode is activated according to the present invention, the fade out is performed gradually for a predetermined time, and the user provides a guide message when the fade out mode is started to the OSD to recognize the operation of the system. By doing so, it provides the effect of increasing the completeness of the system.

In addition, by stopping the random control cycle signal for image data processing at the end of the fade out mode according to the present invention, it is possible to secure the stability of the system by preventing the instability such as the shaking of the image from the clock signal of the asynchronous state Provide the effect.

1 is a main configuration diagram of a PDTV according to the present invention.

2 is a control graph for explaining another embodiment of a fade out function according to the present invention.

3 is a flowchart for explaining the main operation of the present invention.

<Description of Symbols for Main Drawings>

101: color signal decoder 103: mixer

105: AD converter 107: data processing unit

109: phase synchronization loop (PLL) 111: vertical synchronization counter

113: horizontal synchronization counter 115: control unit

Claims (4)

In a control method for signal-free processing of a PDP television, a) determining whether a vertical sync signal or a horizontal sync signal exists from the composite video signal; b) when the vertical synchronization signal or the horizontal synchronization signal is present, displaying image data of the composite video signal on the PDTV, and counting for a predetermined time when the vertical synchronization signal or the horizontal synchronization signal does not exist. step; And and c) fading out the image data within the predetermined time period and feeding back to the b) step. The method of claim 1, further comprising, after step b), b-1) outputting a guide message for recognizing a fade-out function of the image data to the OSD during a predetermined time count. A signal-free control method for a PDTV. The method of claim 1, wherein the fade-out of step c) is performed temporarily after the predetermined time has elapsed. The method of claim 1, wherein the fade-out of step c) is performed gradually during the predetermined time, and for this purpose, the luminance level of the output image data is gradually lowered.