KR100842550B1 - AC Type Plasma Display Panel And Method For Driving The Same - Google Patents

Abstract

The present invention relates to an alternating current plasma display panel and a method of driving the alternating current plasma display panel in which one cell of an alternating current plasma display panel is divided into two subcells and then driven in an interlaced manner. Conventionally, due to the mis-discharge between the adjacent cells there is a zone (Dead Zone) that does not contribute to the discharge because the entire area of the cell is not used for the discharge, the decrease in the aperture ratio causes a problem of reduced brightness and efficiency, There is a problem that there is a limit in solving the pseudo contour problem because sufficient subfields cannot be implemented due to lack of driving time when expressing a gray level.

Accordingly, the present invention implements a single cell of an AC PDP panel in a twin cell structure having an upper subcell and a lower subcell, thereby enabling the entire area of the cell to be used for discharging, thereby maximizing space utilization and increasing aperture ratio. It is possible to improve the brightness and efficiency.

In addition, according to the present invention, when the AC-type PDP panel is driven by the interlaced scanning method for the twin cell, an increase in the unit frame time due to the interlaced scan is used to increase the subfield or the sustain pulse to improve pseudo contour and luminance. In addition to this, the resolution can be improved, and the number of discharges can be reduced to extend the life of the panel.

In addition, in the present invention, the luminance difference between the gray scales is reduced as the gray scale display of one cell is driven by the discharge of the upper subcell and the lower subcell in the AC type PDP panel, so that the smooth image representation in the low gray scale region is achieved. It becomes possible.

AC PDP panel, twin cell, bulkhead, exhaust passage, upper / lower subcell, interlaced

Description

AC Plasma Display Panel And Method For Driving The Same

1 is a diagram showing a cell structure of a typical AC PDP panel.

2 is a diagram showing an electrode arrangement of a conventional AC PDP panel.

3 is a timing diagram for one frame of an ADS driving method applied to a conventional AC PDP panel.

4 is a timing diagram for one frame of an ALIS driving method applied to a conventional AC PDP panel.

5 is a diagram illustrating a twin cell structure of an AC PDP panel according to the present invention;

6 is a diagram conceptually showing a connection relationship between a control circuit for driving a twin cell of an AC PDP panel according to the present invention;

FIG. 7 is a timing diagram illustrating a twin cell driving waveform applied to a case in which one frame is composed of eight subfields in an AC PDP panel according to the present invention. FIG.

Explanation of symbols on the main parts of the drawings

51: bulkhead 52-1: upper subcell

52-2: lower subcell 53: bus electrode

54 holding electrode 61 holding driver                 

62: scan driver 63: address driver

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to an AC plasma display panel capable of driving in an interlaced manner after dividing one cell of an alternating current type PDP panel into two subcells; It relates to the driving method.

Recently, unlike conventional CRT (Cathode Ray Tube) or LCD (Liquid Crystal Display), Plasma Display Panel (Plasma) is a digital display device that can adjust brightness by digital signal and display large screen more clearly. Interest in display panels) is increasing rapidly.

The PDP panel displays characters or graphics using light emitted from the plasma generated during gas discharge. The driving method of the PDP panel is based on a voltage application method, that is, an electrode is applied according to an external voltage application method to make a plasma. It is classified into direct current (DC) type, which is directly exposed to conduction current and flows directly through the electrode, and alternating current (AC) type where displacement current flows because the electrode is not directly exposed because the electrode is covered with a dielectric. can do.                         

Here, the general cell structure of the AC-type PDP panel simplifies the manufacturing process by using a linear partition wall, unlike the DC-type PDP panel, and also as shown in FIG. 1 of the accompanying drawings, a linear barrier (Barrier Rib) ( 11) an address electrode is formed on the rear substrate between the partition wall 11 and two discharge holding electrodes, that is, the scan electrode 12 and the sustain electrode 13, in one PDP cell. In this case, there is a dead zone 15 that does not contribute to discharge because the entire area of the cell is not used for discharge.

In other words, the conventional electrode arrangement of the AC-type PDP panel, is shown in Figure 2 the accompanying drawings, 'M × N' of and has a matrix structure, the heat (Column) direction, the address electrodes (A ₁ ~ M column A _m ) Is arranged, and the row electrode has a three-electrode structure in which scan electrodes SCN ₁ to SCN _n and sustain electrodes SUS ₁ to SUS _n in N rows are arranged.

ADS (Address Display Period Separated) method is mainly used as a driving method of the above-described conventional AC type PDP panel. As shown in FIG. 3, the ADS driving method includes a plurality of frames. 256 gray scales are divided by subfields (usually 8 to 12) (SF1 to SF8), and each subfield (SF1 to SF8) is largely reset for full screen writing and erasing. The timing is arranged so that all sustain discharges proceed simultaneously by dividing into a section, an addressing section, and a sustain section for sustained display.

In this case, AC type PDP panel drive normally drives 60 frames per second to realize VGA level resolution, and when implementing XGA level or higher resolution, double scan which simultaneously writes up and down by dividing the address line of PDP panel in half Do this.

On the other hand, as image display devices for digital multimedia including HDTV (High Definition TV) have progressed in high definition, problems such as luminance deterioration and discharge interference between adjacent cells due to the increase in resolution have emerged as problems. It proposes an ALIS (Alternate Lighting Surfaces Method) driving method that solves discharge interference between cells and at the same time implements XGA-level or higher resolution without performing double scan.

The ALIS driving method is an interlaced scanning method in which ADS is divided by temporally dividing an odd line and an even line to realize a moving picture having 30 frames per second. That is, as illustrated in FIG. 4, the radix field and the even field are each divided into a plurality of subfields SF1 to SF8, and each subfield SF1 to SF8 has a length between sustain discharges according to luminance. That is, the number of sustain discharges is determined.

However, in the above-described AC-type PDP panel, PDP cells have a dead zone that does not contribute to discharge because the entire area of the cell is not used for discharge due to a mis-discharge problem between adjacent cells, thereby reducing the aperture ratio. Causes problems of reduced luminance and lowered efficiency.

In addition, in order to solve this problem, when the image is moved on the screen when the gray scale is expressed, an unwanted gray scale is generated in a specific part, and the pseudo contour is improved by using a plurality of subfields. There is a problem that there is a limit in solving pseudo contour problem because insufficient subfield cannot be implemented due to lack.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to implement a single cell of an AC PDP panel in a twin cell structure having an upper subcell and a lower subcell, thereby using the entire area of the cell for discharge. In this way, it is possible to improve brightness and efficiency by maximizing space utilization and increasing aperture ratio.

Another object of the present invention is to increase the unit frame time due to the interlaced scan by the interlaced scanning method for the twin cell when driving the AC-type PDP panel, and to use the pseudo contour and It is to improve the brightness, improve the resolution, and further extend the life of the panel by reducing the number of discharges.

Another object of the present invention is to drive the gray scale display of one cell by the discharge of the upper subcell and the lower subcell in the AC type PDP panel, so that the luminance difference between the gray scales is reduced, so that a smooth image representation in the low gray scale region is achieved. To make it possible.

In order to solve the above object, in the present invention, each cell constituting the plasma display panel is divided into an upper subcell and a lower subcell to implement a twin cell, and the upper subcell and the lower subcell are one matrix. Driven by an AC plasma display panel surrounded by a partition wall, the sustain electrode for discharging each subcell on the front substrate of the plasma display panel and alternately adjacent to the sustain electrode and the scan electrode are disposed. In the method, one frame is divided into a plurality of subfields, and an upper subcell subfield for driving the upper subcell and a lower subcell subfield for driving the lower subcell are alternately arranged, Drive room for AC plasma display panel, comprising frame Initiate the law.

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

As shown in FIG. 5, the structure of the AC PDP panel according to the present invention is different from that of a general AC PDP panel in which one cell is not one pixel but two subcells. Based on the twin cell structure, the upper subcell 52-1 and the lower subcell 52-2 are driven according to the interlaced scanning method.                     

Here, the subcells 52-1 and 52-2 refer to three color phosphors of R (Red), G (Green), and B (Blue) arranged in a dotted line shape to independently maintain and write erase. It means a unit cell that can be made.

The front substrate of the AC PDP panel has a sustain electrode 54 for discharging the subcells 52-1 and 52-2, and a discharge electrode opposite to the sustain electrode 54 to generate a discharge electrode. Scan electrodes for lowering the line resistance of 54 are alternately adjacent, and exhaust passages for exhausting between adjacent cells are formed below the bus electrode 53 which is not shown in the figure but which borders between the cells. A protective layer for protecting the transparent dielectric layer and the electrode is formed. At this time, the structure of the sustain electrode 54 may be implemented in a T-shaped, rectangular or other structure in addition to the stripe-shaped structure as illustrated in FIG. 5, the electrode having such a structure ( The area of the bus electrode 53 and the sustain electrode 54 may be symmetrical, or may be asymmetrical, as shown in FIG.

In addition, an address electrode for writing is formed on the rear substrate of the AC PDP panel, and an upper subcell 52- which forms one cell with a partition wall 51, which forms a partition for forming a discharge space, has a height of 60 to 200 µm. It is formed in the form of a matrix surrounding 1) and the lower subcell 52-2.

Meanwhile, the AC type PDP panel according to the present invention has a series of control circuits in which a plurality of sustain electrodes, bus electrodes, and address electrodes control respective driving states as shown in FIG. By forming an electrical connection of the image information is displayed on the PDP panel, wherein the control circuit is a holding driver 61 for driving in the interlaced scan method for the upper and lower sub-cells forming one cell And a scan driver 62 and an address driver 63 are shown.

In addition, one frame of the image displayed by the twin cell is divided into two upper subcell fields and a lower subcell field to display the overall gray level. In this case, the panel driving circuit is configured as a twin cell, namely, a frame of one screen. In this case, the upper and lower subcells are driven. That is, one frame is composed of one field, and the gradation constituting one field is composed of a combination of an upper subcell gray level and a lower subcell gray level.

On the other hand, in the case of implementing one frame with eight subfields in the AC-type PDP panel according to the present invention, the upper and lower subcell fields are attached to the driving waveforms as illustrated in FIG. 7, that is, the electrodes of the upper subcells. By supplying sustain pulse waveforms which are reversed to each other with respect to the electrodes of the lower and subcells in an interlaced scanning manner, erroneous discharge between adjacent cells can be prevented.

In addition, the AC-type PDP panel according to the present invention may use a twin cell driving waveform using a square wave. The driving waveform may be divided into an upper subcell field and a lower subcell field to display gray levels as described above. It is used for driving.

That is, since the AC-type PDP panel having the twin cell structure according to the present invention executes by dividing the entire screen into discharge (display) of the upper subcell and discharge (display) of the lower subcell, as illustrated in FIG. The frame is divided into an upper subcell field and a lower subcell field, and each of the upper subcell field and the lower subcell field is divided into a plurality of subfields. Here, dividing each field into a plurality of subfields is for displaying gray scales. For example, to realize 256 gray scales, the upper subcell field and the lower subcell field must be divided into eight subfields.

At this time, in the driving waveform supplied, an initialization discharge is performed by applying a voltage pulse between all adjacent sustain electrodes and a bus electrode in the initialization section, and a scan pulse, which is a selection pulse, is sequentially applied to the bus electrode in the address section. The address discharge is applied to the address electrode corresponding to the selected subcell to perform the address discharge. After the initialization discharge and the write discharge are executed over all the screens, the sustain pulse is alternately applied to the sustain electrode and the scan electrode to perform the sustain discharge. do.
As shown in FIG. 7, in the present invention, one frame is divided into a plurality of subfields, and an upper subcell subfield for driving an upper subcell and a lower subcell subfield for driving a lower subcell. Are arranged alternately to form a frame.

On the other hand, the AC-type PDP panel driving method having the twin cell structure described above separates one frame from the upper subcell line and the lower subcell line, unlike the conventional ALIS driving method of driving one frame into the even cell and the odd cell. In this case, the interlaced scanning method, which performs ADS with half gray level, realizes the moving picture having 30 frames per second, which enables the smooth moving picture display in the low gray level area. If used in the doctor can improve the contour.

In addition, since the discharge area of one subcell is almost the same as that of a conventional cell, the brightness is the same but the loss of light is reduced, and when the number of sustain pulses is increased by the time secured from driving, the overall brightness can be improved. As a result, the current required for driving is reduced, and the efficiency of the twin cell can be improved by 1.5 times.

Looking at the manufacturing process of the AC-type PDP panel having such a twin-cell structure, manufacturing the front substrate first forms a sustain electrode of ITO (Indium Tin Oxide) material on the front substrate, and then print process or photosensitive The process is used to form a bus electrode, and the subsequent process consists of forming a dielectric layer and a protective layer as in a general PDP fabrication process.

Then, the back substrate is fabricated by forming a back electrode after forming an address electrode using a printing process or a photosensitive process, and then forming a partition on the address electrode by using a sandblast process or other available process. R, G, and B phosphors are formed between the partition walls.

In this way, after the front substrate and the back substrate are manufactured, the PDP panel is completed by encapsulating the front substrate and exhausting the panel in a high vacuum state in order to smooth discharge, and then injecting and encapsulating the mixed gas.

In addition, the embodiments according to the present invention are not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention implements a single cell of the AC-type PDP panel in a twin cell structure having an upper subcell and a lower subcell, thereby enabling the entire area of the cell to be used for discharging, thereby maximizing space utilization and Increasing the aperture ratio makes it possible to improve luminance and efficiency.

In addition, according to the present invention, when the AC-type PDP panel is driven by the interlaced scanning method for the twin cell, an increase in the unit frame time due to the interlaced scan is used to increase the subfield or the sustain pulse to improve pseudo contour and luminance. In addition to this, the resolution can be improved, and the number of discharges can be reduced to extend the life of the panel.

In addition, according to the present invention, the luminance difference between the gray scales is reduced as the gray scale display of one cell is driven by the discharge of the upper subcell and the lower subcell in the AC PDP panel, thereby enabling smooth image expression in the low gray scale region. Lose.

Claims (9)

delete delete delete delete delete delete delete delete Each cell constituting the plasma display panel is divided into an upper subcell and a lower subcell to implement a twin cell, and the upper subcell and the lower subcell are surrounded by a matrix-shaped partition wall, In a driving method of an AC plasma display panel in which a sustain electrode for discharging each subcell on a front substrate and alternately adjacent to the sustain electrode and a scan electrode are provided. One frame is divided into a plurality of subfields, and an upper subcell subfield driving the upper subcell and a lower subcell subfield driving the lower subcell are alternately arranged to form one frame. A method of driving an alternating current plasma display panel.

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