KR100212835B1 - A monitor using a plasma display panel - Google Patents

Abstract

The present invention relates to a monitor employing a plasma display panel, the apparatus comprising: a phase locked loop (100); A horizontal position setting unit 200; A vertical position setting unit 300; A clock signal generator 400; An amplifier unit 500; And an A / D converter 600. According to the present invention configured as described above, the horizontal / vertical synchronizing signal and the computer signal input from the computer are received and converted into computer data for progressive scanning, The display panel can be scanned by an aberration scanning method.

Description

Monitor using plasma display panel

FIG. 1 is a partial block diagram of a monitor employing a plasma display panel according to the present invention; FIG.

Figure 2 is a block diagram of the configuration of the phase-locked loop shown in Figure 1;

FIG. 3 is a block diagram of the vertical position setting unit shown in FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

100; Phase-locked loop 120: phase comparator

140: Loop filter 160: Voltage controlled oscillator

180: N divider 200: Horizontal position setting unit

300: vertical position setting unit 320: first counter

340: D flip flop 360: AND gate

380: second counter 400: clock signal generator

420: AND gate 500: Amplification unit

600: A / D conversion section

[0001] The present invention relates to a plasma display panel, and more particularly to a plasma display panel in which a horizontal / vertical synchronizing signal and a computer signal are received from a computer to output computer data according to a progressive scan method for display on a plasma display panel And a monitor employed.

In general, cathode ray tubes (CRTs) are still in the spotlight in the field of display devices, and such CRTs have a few drawbacks. That is, since the CRT itself has a fresco-like structure, it is large in size and high in operating voltage, requiring a voltage of about 10,000 V, and also has the drawback that display distortion occurs.

In order to solve the drawbacks of the CRT, a flat display device having a matrix structure has been studied. Specifically, a method of solving the drawbacks of the CRT is specifically described. The matrix structure is used to solve the display distortion phenomenon, Solves the problem of size, and solves the problem of high voltage by not using electron beam driven by high voltage.

The above-mentioned flat panel display device includes an active element EL, a light emitting diode (LED), a plasma display panel (PDP), and the like. Passive elements include a liquid crystal display (LCD) (ECD) and the like.

Among the above flat panel display devices, a plasma display panel (hereinafter referred to as PDP) is a flat panel display device that uses a penning mixed gas for a discharge phenomenon. The flat panel display device is a flat display device in which a relatively high atmospheric pressure (100 Torr or more) (He) gas or the like based on a discharge between narrow electrodes coated with dielectrics as a dielectric, and has a performance suited to computer terminals and educational systems, and has been partially used as a computer display .

The above-described penning gas is mainly Ne + Xe, Ne + He + Xe, and the reason why such a mixed gas is used is that the discharge starting voltage can be lowered when the mixed gas is more than one gas component. Discharge initiation voltage, type of gas, penning gas pressure, and the structure and form of the panel.

Since such a PDP is suitable for a large-area display device and can be colored, a planar wall-mounted television is also being accessed. Particularly, an AC type (indirect discharge type) PDP is capable of displaying a large- Has attracted attention as a panel.

The types of PDPs can be classified as follows.

First, according to the discharge type, the PDP is classified into an AC type PDP (indirect discharge type) and a DC type PDP (direct discharge type) depending on the type of the driving voltage applied to the discharge cell.

That is, an AC type PDP is driven by a sinusoidal AC voltage or a pulse voltage, while a DC type PDP is driven by a DC voltage.

In general, two types of PDPs have different structures. In an AC type PDP, the electrode is covered with a dielectric of the glass, whereas a DC type PDP is exposed to an electrode, and a discharge current flows while a discharge voltage is applied.

The AC type PDP has a storage function inside the cell, but the DC type PDP has a merit such as facilitating image display by adding a gray scale.

Secondly, there is a memory type in which the panel itself stores the display information, and a refresh type in which the panel itself has a memory of display information outside the panel and displays it on the panel repeatedly.

Third, according to the shape of the display, the panel has a lattice-shaped electrode, the intersection of each electrode constitutes a pixel, a dot matrix type in which the degree of freedom is relatively high and characters and figures are displayed according to the relationship of the points, There is a segment type used for small display.

Fourth, when classified according to the form of the discharge spot address display mechanism for display, a self-scan PDP and a self-shifting PDP, which are functionalized panel displays to which self-scanning functions of discharge points are given, .

The above-described PDP has the following advantages over other display devices. That is, since discharge is not performed when the voltage is less than a certain voltage (firing voltage), there is no restriction on the number of plasma display lines due to such nonlinearity, so that a large-scale fabrication is possible and a multiplexing technique for reducing the number of driving circuits can be used.

A large matrix display also has a memory function, which is needed to eliminate high brightness and blinking, while the CRT has a lifetime of 20,000 hours, while a PDP has a lifetime of 50,000 hours.

PDP is suitable for mass production because it does not have easily broken parts other than glass. Because it is simple in structure, large panel can be manufactured and it is possible to have a resolution of 100 lines / inch or more due to strong nonlinearity.

Since the discharge material is gas, the refractive index is 1, which means that the light does not disappear due to internal reflection and that external light is not reflected or scattered by the display material.

In addition, unlike other flat panels, the PDP 400 This means that the plasma display is operable even in the presence of a high-humidity condition or a reactive gas. Most of the plasma displays have no characteristic change due to the external temperature, but are changed only by the driving circuit.

The computer system will be briefly described as follows.

The peripherals of the personal computer system include a printer that prints various kinds of information contained in a main personal computer (PC) on paper, a display monitor that displays various information on the screen, a floppy disk drive (FDD) , An auxiliary storage device such as a hard disk drive (HDD), and a modem used to connect various kinds of information to another computer with a telephone line.

Among them, the display monitor is a device that displays the information of the main device in the easiest and quickest manner as an image. In the present invention, the display monitor is implemented as a PDP.

Subsequently, the scanning method can be divided into interlaced scanning and noninterlaced scanning.

The interlaced scanning is a method of scanning an image and outputting it as an electric signal or displaying the image on the screen by skipping one or more scanning lines from the top to the bottom of the screen. When one frame is composed of a field composed of odd- And then the even field is scanned first and then the even field is scanned.

On the other hand, the progressive scan refers to a method of scanning an image and outputting it as an electric signal or displaying the image on the screen without skipping the scan line sequentially from the top to the bottom of the screen, and the progressive scan is denser than the interlace scan.

Generally, since a computer scans according to a progressive scanning method, the present invention for a computer signal will be described based on progressive scanning.

When a display portion of a computer monitor is implemented as a PDP, an apparatus for converting a computer signal input from a computer main body into a display panel to be sequentially scanned must be provided in the monitor.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems, and it is an object of the present invention to provide a plasma display device capable of sequentially scanning a plasma display panel by receiving horizontal / vertical synchronizing signals and computer signals from a computer and converting the signals into computer data for progressive scanning It is an object of the present invention to provide a monitor employing a plasma display panel capable of progressive scanning on a panel.

According to an aspect of the present invention, there is provided a monitor employing a plasma display panel, including: a phase locked loop receiving a horizontal synchronizing signal from a computer and outputting a signal synchronized with the frequency and phase of the horizontal synchronizing signal; A horizontal position setting unit for receiving a signal from the phase locked loop to set a horizontal position and outputting a horizontal position signal; A vertical position setting unit for receiving a horizontal synchronizing signal and a vertical synchronizing signal from a computer and outputting a vertical position signal by setting a vertical position; A clock signal generator for receiving a horizontal position signal from the horizontal position setting unit and a vertical position signal from the vertical position setting unit and outputting a clock signal; An amplifier for receiving a computer signal from a computer and performing amplification and level shifting; And an A / D converter for receiving the amplified analog computer signal from the amplifier and converting the amplified analog computer signal to digital computer data according to a clock signal from the clock signal generator.

Hereinafter, the structure of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a partial block diagram of a monitor employing a plasma display panel according to the present invention. The monitor of the present invention receives a horizontal synchronizing signal H Sync from a computer (not shown) A phase locked loop (PLL) 100 for outputting a signal synchronized with the frequency and phase of the synchronous signal; A horizontal position setting unit 200 for receiving a signal from the phase locked loop 10 to output a horizontal position signal by setting a horizontal position H Position and a horizontal synchronizing signal H Sync from the computer, A vertical position setting unit 300 for receiving a synchronizing signal V Sync and setting a vertical position V Position to output a vertical position signal; A clock signal generator 400 receiving a horizontal position signal from the horizontal position setting unit 200 and a vertical position signal from the vertical position setting unit 300 and outputting a clock signal; An amplifying unit 500 for receiving a computer signal (R, G, B signal) from a computer and performing amplification and level shifting; And the amplified analog computer signals R, G and B from the amplifier 500 and outputs the digital computer data R, G and B data according to the clock signal from the clock signal generator 400 And an A / D converter 600 for converting the A / D conversion result.

FIG. 2 is a block diagram of the phase-locked loop shown in FIG. 1, in which the PLL 100 inputs a horizontal synchronizing signal H Sync and a feedback signal from a computer (not shown) A phase comparator 120 (Phase Comparator or Phase Detector; PC) for generating a voltage corresponding to a phase difference between two input signals; A loop filter (LF) 140 for removing high frequency components generated by the phase comparator 120; A voltage controlled oscillator (VCO) 160 whose oscillation frequency changes according to the control voltage output from the loop filter 140; And an N-divider 180 for dividing the output frequency of the voltage-controlled oscillator 160 by an integer N and then transmitting the divider to the phase comparator 120.

3 is a block diagram of the vertical position setting unit 300 shown in FIG. 1. The vertical position setting unit 300 (referenced by the same inventor on the same date) comprises a horizontal A first counter 320 for receiving a sync signal H Sync and a vertical sync signal V Sync and counting a line corresponding to a vertical blanking interval; A D flip flop 340 for receiving and temporarily storing the digital video signal according to a vertical synchronization signal V Sync from the computer; An AND gate 360 performing an AND operation on a horizontal synchronizing signal H Sync from the computer and an input signal from the D flip flop 340; And a second counter for counting the lines of the image information and receiving the vertical sync signal V Sync from the end gate 360 and the computer, 380).

The clock signal generator 400 shown in FIG. 1 receives a horizontal position signal from the horizontal position setting unit 200 and a vertical position signal from the vertical position setting unit 300 and performs a logical product And an AND gate 420 for outputting a clock signal.

Next, operations and effects of the present invention will be described in detail.

The phase locked loop (PLL) 100 shown in FIG. 1 adjusts an output frequency and a phase to an input frequency and phase using a feedback signal. In other words, an input signal, that is, Here, the circuit receives a horizontal synchronizing signal (H Sync) from a computer and outputs the synchronized signal synchronized with the frequency and phase of the horizontal synchronizing signal (H Sync) And outputs a signal.

The operation of the phase-locked loop 100, which coincides the output frequency with the input frequency, will be described in detail as follows.

2, the phase comparator 120 generates a voltage corresponding to the phase difference between the two input signals, and the loop filter 140 removes high frequency components generated in the phase comparator 120 The voltage-controlled oscillator 160 is an oscillator whose oscillation frequency varies according to a control voltage. The N-divider 180 is connected to the voltage-controlled oscillator 160, 160 to an integer N and then feeds back the result to the phase comparator 120. [

V ₁ (t) and V _{1 i} is the input signal voltage and the phase, V ₀ (t) and ₀ is the output signal voltage of the voltage controlled oscillator 160 and its phase, V _d (t) is the output voltage of the phase comparator 120, V _c (t) is the control voltage of the voltage controlled oscillator 160, F ) Represents the voltage transfer function of the loop filter 140. [

V _i (t) is applied to the phase comparator 120, the ground phase comparator (120), and generates a V _d (t) corresponding to the phase difference between V _o (t) and V _i (t) V _d (t) Frequency component is removed by the loop filter 140 and only the low frequency component becomes the control voltage V _c (t) of the voltage-controlled oscillator 160 and V _c (t) becomes Vi (t) and V _o Controlled oscillator 160 so that the frequency difference of the frequency-controlled oscillator 160 becomes smaller.

At this time, in the synchronous state, the frequency of the voltage-controlled oscillator 160 matches the frequency of the input signal, but the phase difference is the frequency of the voltage-controlled oscillator 160 at the oscillation frequency V _c (t) = 0 (The oscillation frequency of the voltage-controlled oscillator 160 of the oscillator 160) to the frequency of the input signal.

Referring to FIG. 1, the horizontal position setting unit 200 receives a signal synchronized with the horizontal synchronizing signal from the phase-locked loop 100 and outputs the horizontal synchronizing signal to a horizontal position (for example, a computer VGA mode corresponding to 640 * 480) 640 clocks are counted and 640 clock periods are output as a high level). In the horizontal position, when there is a need to set only a section having video information in one line, Is the appropriate section with.

The vertical position setting unit 300 receives the horizontal synchronizing signal H Sync and the vertical synchronizing signal V Sync from the computer and outputs a vertical position signal by setting the vertical position V Position. In case of setting, 480 lines are set per frame.

The vertical position refers to an appropriate section of the frame when there is a need to set only a line having video information in one frame.

For reference, the standard of the computer signal is that the interval of the vertical synchronization signal (V Sync) corresponds to 2H, the interval of the vertical blanking which does not include image information corresponds to 42H, and the image information is included The corresponding section corresponds to 480H.

As shown in FIG. 3, the vertical position setting unit 300 according to an embodiment of the present invention will be described with reference to a vertical position setting apparatus, The first counter 320 receives the horizontal synchronizing signal H Sync and the vertical synchronizing signal V Sync from the first counter 320 and counts 42H corresponding to the vertical blanking interval.

The D flip-flop 340 receives the counting signal from the first counter 320, temporarily stores the counted signal, and outputs the counted signal according to the vertical synchronization signal V Sync from the computer. At this time, The section corresponding to 480H and the portion corresponding to the remaining 1H are in the high state, that is, the 481H section is outputted in the high state.

The horizontal synchronizing signal H Sync from the computer and the input signal from the D flip flop 340 are inputted to the AND gate 360 and the logical AND is performed.

The second counter 380 receives the signal from the AND gate 360 and the vertical synchronizing signal V Sync from the computer and counts the line of the section where the image information exists, that is, 480H, Output. This output signal becomes a vertical position signal.

The AND gate 420, which is the clock signal generator 400 shown in FIG. 1, generates a horizontal position signal from the horizontal position setting unit 200 and a vertical position signal from the vertical position setting unit 300 And outputs a clock signal after performing an AND operation.

1, the amplifying unit 500 receives analog computer signals (R, G, and B singals) from a computer and performs amplification and level shifting. In the A / D converter 600, G and B data from the clock signal generator 400 according to a clock signal from the clock signal generator 400 and outputs the amplified analog computer signals R, do.

Accordingly, by providing data capable of scanning 60 screens per second to a plasma display panel (not shown) of the monitor, sequential scanning becomes possible.

As described above, according to the present invention, the horizontal / vertical synchronizing signal and the computer signal input from the computer are received and converted into computer data for progressive scanning, so that the scanning can be performed on the plasma display panel sequentially have.

The embodiments described above are merely illustrative in all respects and should not be construed as limiting, but all modifications that fall within the true spirit and scope of the present invention belong to the scope of the present invention.

Claims (1)

A phase locked loop (100) for receiving a horizontal synchronizing signal from a computer and outputting a signal synchronized with the frequency and phase of the horizontal synchronizing signal; A horizontal position setting unit 200 for receiving a signal from the phase locked loop 100 and setting a horizontal position and outputting a horizontal position signal; A vertical position setting unit 300 for receiving a horizontal synchronizing signal and a vertical synchronizing signal from a computer and outputting a vertical position signal by setting a vertical position; And an AND gate 420 for receiving a horizontal position signal from the horizontal position setting unit 200 and a vertical position signal from the vertical position setting unit 300 to perform a logical multiplication and outputting a clock signal, (400); An amplification unit 500 for receiving a computer signal from a computer and performing amplification and level shifting; And an A / D converter 600 for receiving the amplified analog computer signal from the amplifier 500 and converting the amplified analog computer signal to digital computer data according to a clock signal from the clock signal generator 400 and outputting the digital computer data A monitor employing a plasma display panel configured.