KR0174925B1 - Apparatus for selecting the video signal in plasma display panel - Google Patents

Abstract

The present invention relates to a video signal selection device in a PDP, wherein a desired composite video signal is tuned in a tuner and provided to an image processor and a pulse signal generator, respectively, wherein a vertical synchronous signal and a horizontal synchronous signal are synchronized among the composite video signals. The separation unit separates the pulse signal of the horizontal line video signal from the first counter to the rising edge of the horizontal line video signal from the color burst signal and the pedestal level to the falling edge of the horizontal line video signal from the first counter. From the rising edge of the pulse signal for the horizontal line video signal to the position where the luminance signal starts, a high level pulse signal is generated, and finally, an effective video signal is output from the horizontal line video signal in which the video signal exists from the second AND gate. A pulse signal for selection is generated, processed by the image processor, and displayed on the PDP. Meurosseo, since the video signal is present in only the effective video signal, select the horizontal line video signal to image processing, which will not only can prevent a waste of memory to speed up the process.

Description

Video signal selector in PD

1 is a schematic block diagram of an exemplary image signal processing apparatus according to the present invention.

2 is a detailed view of the pulse signal generator 100 of FIG.

3 is a diagram for describing a horizontal line video signal of a radix field and a pulse signal generated from an output terminal of the first AND gate 120 in a composite video signal as an example according to the present invention.

4 is a diagram illustrating a pulse signal for selecting an effective video signal of one horizontal line video signal among horizontal line video signals of an odd field as an example according to the present invention.

5 is a view for explaining a conventional conventional horizontal position.

* Explanation of symbols for main parts of the drawings

50: tuner 100: pulse signal generator

105: sync separation unit 110: horizontal position selector

120: first AND gate 130: first counter

140: second counter 145: second AND gate

150: image processing unit 200: memory

The present invention relates to a PDP (PLASMA DISPLAY PANEL, hereinafter abbreviated as PDP), and more particularly, to select an image signal in a PDP in which an effective image signal can be selected among horizontal line image signals of a composite image signal transmitted from a broadcasting station. Relates to a device.

In recent years, many studies on so-called flat display devices having large display areas and small volumes have been continuously conducted in various fields related thereto.

Such flat display devices include active elements such as ELECTRO LUMINESCE NCE, LIGHT EMITTING DIODE, PDP, LIQUID CRYSTAL DISPLAY, ELECTRO CHROMIC DISPLAY, etc. There is a passive element of, and the present invention relates to a PDP which is substantially one of the active elements.

FIG. 5 is a diagram for explaining a conventional horizontal position. When a composite video signal transmitted from a broadcasting station is scanned through a cathode ray tube, FIG. 5 is a diagram illustrating a horizontal line video signal between a horizontal line video signal and a horizontal line video signal. For example, a blanking section, more specifically, a color burst signal, a PEDISTAL level, and a luminance signal, which are not effective video signals, are scanned into the cathode ray tube. On the right side, a blank such as 의 of FIG. 5 is displayed.

In this case, the horizontal position refers to the horizontal distance of the screen on which the effective video signal is scanned except for the blank. In the case of the cathode ray tube, the width of the horizontal position can be adjusted by adjusting the voltage provided to the deflection coil.

However, as is well known to those skilled in the art, in the PDP, due to its structural characteristics, the width of the horizontal position cannot be adjusted by voltage control, and therefore, waste and processing of memory by sampling the entire section of the horizontal line video signal. The problem of delayed speed is caused.

Accordingly, the present invention has been made in view of the above-described problems of the prior art, and provides a video signal selection apparatus in a PDP capable of selecting an effective video signal among horizontal line video signals of a composite video signal transmitted from a broadcasting station. The purpose is.

In order to achieve the above object, the present invention provides a PDP apparatus for processing a composite video signal of a desired channel among the composite video signals transmitted from a broadcasting station through a tuner, and then displaying the composite video signal through the tuner. A horizontal line image signal of the composite image signal through the tuner based on a synchronous separation means for separating a vertical synchronous signal and a horizontal synchronous signal, and a vertical synchronous signal and a horizontal synchronous signal separated by the synchronous separation means and a clock from the outside A pulse signal generating means for generating a pulse signal for selecting a section in which an effective video signal exists during the operation and a horizontal one of the effective video signal sections in the composite video signal through the tuner based on the pulse signal from the pulse signal generating means. Image signal processing means for signal processing line video signal by one line unit To provide a video signal selection apparatus of the PDP according to claim.

Other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram of a typical image signal processing apparatus according to the present invention. As can be seen from the drawings, the tuner 50, the pulse signal generator 100, the image processor 150 and the memory ( 200).

In FIG. 1, the tuner 50 tunes the corresponding composite video signal based on the channel selection signal from the microcomputer shown in the composite video signal transmitted from the broadcasting station, and the pulse signal generator 100 tunes the tuner. A pulse signal for selecting an effective video signal from the horizontal line video signal including the video signal of the composite video signal tuned at 50 is generated.

The image processor 150 performs image processing on the effective image signal among the horizontal line image signals of the composite image signal tuned by the tuner 50 based on the pulse signal from the pulse signal generator 100, and the memory 200. Stores an effective video signal of the radix field processed by the image processor 150.

2 is a detailed view of the pulse signal generator 100 of FIG. 1, and as can be seen from the same drawing, the pulse signal generator 100 may include a synchronous separator 105 and a horizontal position selector 110. ), A first AND gate 120, a first counter 130, a second counter 140, and a second AND gate 145.

2, the synchronizing separator 105 separates the vertical synchronizing signal Vs and the horizontal synchronizing signal Hs of the composite video signal tuned by the tuner 50, and the horizontal position selector 110 synchronizes the synchronizing signal. The video signal exists except for a section in which there is no video signal (a blanking section in which the vertical sync signal Vs exists) by using the vertical synchronization signal Vs and the horizontal synchronization signal Hs separated by the separation unit 100. Generates a pulse signal for selecting the section to be.

In addition, the first AND gate 120 inputs a pulse signal generated from the horizontal position selector 110 to one input terminal, and inputs a horizontal synchronous signal Hs separated from the synchronization separator 100 to the other input terminal. Then, by performing a logical multiplication, a pulse signal for selecting a horizontal line video signal in which the video signal exists is generated.

In addition, the first counter 130 counts a first predetermined number, i.e., horizontal line, from the rising edge of the pulse signal output from the output terminal of the first AND gate 120 to the external clock CLK. When the number of clocks up to the section where the color burst signal and the pedestal level of the video signal exist, the counting signal generates a high level pulse signal and the falling edge of the pulse signal output from the output terminal of the first AND gate 120. Occurs).

In FIG. 2, the second counter 140 generates a high level pulse signal from the rising edge of the pulse signal output from the output terminal of the first AND gate 120, and then counts a clock provided from the outside. The predetermined number, i.e., the number of clocks from the rising edge of the pulse signal output from the output terminal of the first AND gate 120 to the starting point of the luminance signal, is generated until the second AND gate 145 is counted. 2 Selecting an effective video signal from a horizontal line video signal having a video signal by inputting a pulse signal generated from the counter 140 to one input terminal and logically multiplying the pulse signal generated from the first counter 130 to the other input terminal. Generates a pulse signal for

The operation of the video signal selection device in the PDP according to the present invention, which is constituted as described above, will be described in more detail with reference to FIGS. 1, 2, 3, and 4.

First, as is well known in the art, one frame (FRAME) is a radix field (ODD FIELD) in which 262.5H (1H to 262.5H) horizontal line video signal is scanned, and 263.5H (262.5H) 525H) is composed of an even field formed by scanning a horizontal line video signal. In addition, the horizontal line video signal includes a color burst signal, a pedestal level, an effective video signal, and a luminance signal.

Herein, the present invention relates to substantially selecting only effective video signals excluding color burst signals, pedestal levels, and luminance signals among horizontal line video signals.

As described above, one frame is composed of two fields (odd field and even field), and will be described by dividing into two fields, odd field and even field, for better understanding.

First, an operation process of selecting an effective video signal among the horizontal line video signals of the radix field will be described.

First, a composite video signal transmitted from a broadcasting station is received through an antenna, and the composite video signal of a desired channel is tuned by the tuner 50 and then input to the image processor 150 and the pulse signal generator 100.

Next, the vertical synchronizing signal Vs and the horizontal synchronizing signal Hs are separated from the synchronizing separator 105 among the composite image signals input to the pulse signal generator 100 and provided to the horizontal position selector 110, respectively. In this case, a pulse signal is generated from the horizontal position selector 110 to select a section in which the video signal except for the section in which the video signal is absent among the composite video signals of the radix field as shown in FIG. Input to one input terminal of the first AND gate 120, the horizontal synchronization signal (Hs) (Fig. 3 (b)) separated from the synchronization separator 105 is input to the other input terminal of the first AND gate 120. do.

Accordingly, a pulse signal such as (c) of FIG. 3 is generated from the output terminal of the first AND gate 120 and provided to the first counter 130 and the second counter 140, respectively. ) Are provided to the first counter 130 and the second counter 140, respectively.

Next, an operation process of selecting an effective video signal of the horizontal line video signal will be described in more detail with reference to FIG. 4.

Here, (a) of FIG. 4 shows a pulse signal for one horizontal line image signal among the pulse signals output from the output terminal of the first AND gate 120 shown in (c) of FIG. 4 (b) shows the clock CLK provided from the outside.

On the other hand, when a pulse signal for one horizontal line image signal as shown in FIG. 4A from the first AND gate 120 is provided to the first counter 130, the first counter 110 may transmit the horizontal line image signal. The first predetermined number set by counting the number of clocks from the rising edge of the pulse signal with respect to the external clock (Fig. 4 (b)), that is, the number of clocks corresponding to the section in which the color burst signal and the pedestal level exist. When both are counted, a high level pulse signal is generated, and then a polling edge of the pulse signal for one horizontal line image signal is generated ((c) of FIG. 4).

In addition, when a pulse signal for one horizontal line image signal as shown in FIG. 4A from the first AND gate 120 is provided to the second counter 140, the second counter 140 may have one horizontal line. Generates a high-level pulse signal from the rising edge of the pulse signal for the video signal, and then counts the number of clocks of the clock (Fig. 4 (b)) provided from the outside. It occurs until the number of clocks, from the rising edge of the pulse signal to the start position of the luminance signal, is all counted ((d) in FIG. 4).

Next, a pulse signal such as (c) of FIG. 4 is generated from the first counter 130 and input to one input terminal of the second AND gate 145, and from (d) of FIG. When a pulse signal is generated and input to the other input terminal of the second AND gate 145, it is effective in the horizontal line image signal in which the image signal exists as shown in FIG. 3E from the output terminal of the second AND gate 150. A pulse signal for selecting an image signal is generated and provided to the image processor 150.

On the other hand, the pulse signal for selecting an effective video signal among the horizontal line video signal is generated from the pulse signal generator 100 as described above with respect to the remaining horizontal line video signals constituting the odd field. 150).

Accordingly, the horizontal of the radix field composite video signal tuned by the tuner 50 based on a pulse signal for selecting an effective video signal among the horizontal line video signals provided with the video signal provided from the output terminal of the second AND gate 145. The effective video signal of the line video signal is processed by the image processor 150 and then stored in the memory 200.

Secondly, the operation process of selecting an effective video signal among the horizontal line video signals of the even field is performed as described above, except that the horizontal line video signals constituting the even field are from 263H to 525H. Since the operation process of selecting an effective video signal among the video signals is substantially the same, the description herein will be omitted to avoid duplicate descriptions.

As described above, the desired channel composite video signal is tuned by the tuner 50 and provided to the image processing unit 150 and the pulse signal generating unit 100, respectively, and the vertical synchronization signal Vs is horizontal to the composite video signal. The sync signal Hs is separated by the sync separator 105 so that the pulse signal of the high level is horizontal after the color burst signal and the pedestal level at the rising edge of the pulse signal for the horizontal line video signal from the first counter 130. A high level pulse signal is generated from the second counter 140 to the position where the luminance signal starts from the rising edge of the pulse signal for the horizontal line image signal. A pulse signal for selecting an effective video signal is generated from the horizontal line video signal in which the video signal exists, and is processed by the image processor 150 and then displayed on the PDP. .

On the other hand, those skilled in the art will readily appreciate that the same result can be obtained even if the clock frequency from the outside provided in the embodiment of the present invention is changed.

Therefore, according to the present invention, since only the effective video signal can be selected and processed in the horizontal line video signal in which the video signal exists, it is possible to prevent waste of memory and to speed up the processing speed. .

Claims (7)

A PDP apparatus for processing a composite video signal of a desired channel among the composite video signals transmitted from a broadcasting station through a tuner 50 and then displaying the composite video signal through a tuner 50. Synchronous separating means 105 for separating horizontal synchronous signals; A pulse for selecting a section in which a valid video signal exists among the horizontal line video signals of the composite video signal through the tuner based on the vertical synchronous signal and the horizontal synchronous signal separated by the synchronization separating means 105 and a clock from the outside; Pulse signal generating means (110, 120, 130, 140, 145) for generating a signal; Based on the pulse signal from the pulse signal generating means (110, 120, 130, 140, 145), the horizontal line video signal of the effective video signal of the composite video signal through the tuner 50 in a line unit A video signal selection device in a PDP, characterized in that the video signal processing means (150). 2. The apparatus of claim 1, wherein the pulse signal generating means comprises: horizontal position selecting means for generating a pulse signal for selecting a section in which a video signal exists among the composite video signals tuned by the tuner; First logic means for generating a pulse signal for selecting a horizontal line video signal in which the video signal exists by using the pulse signal from the horizontal position selecting means and the horizontal synchronous signal separated by the synchronous separating means; When the first predetermined number set by counting the clock provided from the outside from the rising edge of the pulse signal from the first logic means is counted, a pulse signal of high level is generated and then a pulse signal generated from the first logic means. First pulse generating means for generating up to a falling edge of the pulse; Generating a high level pulse signal from the rising edge of the pulse signal in the first logic means, and then generating a high level pulse signal until the second predetermined number set by counting a clock supplied from the outside is counted; Two pulse generating means; Second logic means for generating a pulse signal for selecting an effective video signal from a horizontal line video signal in which the video signal exists using the pulse signal from the first pulse generating means and the pulse signal from the second pulse generating means Image signal selection device in the PDP, characterized in that consisting of. The video signal processing unit of claim 1, wherein the video signal processing unit is configured to perform processing of an effective video signal in a horizontal line video signal having a video signal of a composite video signal through the tuner based on a pulse signal from the pulse signal generating unit. Image processing means; And a memory for storing the effective video signal of the radix field processed by the video processing means. 3. An apparatus according to claim 2, wherein each pulse generating means is a counter. The apparatus of claim 2, wherein the first predetermined number is a number of clocks corresponding to a section in which a color burst signal and a pedestal level exist. 3. The apparatus of claim 2, wherein the second predetermined number is a clock number corresponding to a rising edge of one horizontal line image signal to a position at which the luminance signal starts. 3. The apparatus of claim 2, wherein each logic means is an AND gate.