KR20010002343A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to enhance an aperture ratio decreasing a driving voltage, and to further improve a light emitting luminance and a light emitting efficiency. CONSTITUTION: A barrier rib(34) includes head portions(34a) each with a thick width at an upper/lower edge portions and a neck portion(34b) with a narrow width. The neck portion(34b) widens a center portion of a discharge space(46). The discharge area of a plasma display panel is expanded when the discharge space(46) is widened. A luminance and a light emitting efficiency are improved because much ultraviolet ray excites a fluorescent substance(44). Further, an interference between electrodes is minimized, and so it is possible to reduce a mis-discharge and improve uniformity.

Description

Plasma Display Panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly to a structure of a plasma display panel designed to lower a driving voltage.

Recently, as a large display device is required, research on a plasma display panel (hereinafter referred to as "PDP") has been actively conducted. A PDP is a display device that displays an image using a gas discharge phenomenon, and is largely classified into a direct current (DC) method and an alternating current (AC) method according to a discharge method. AC type PDP has a lot of low power consumption and life time compared to DC type, and research is being actively conducted.

Referring to FIG. 1, an upper glass substrate 10 on which scan and sustain electrode pairs 16, a dielectric layer 18, and a protective layer 20 are stacked, an address electrode 22, a phosphor 24, and a partition wall 14 are formed. A three-electrode alternating current drive type PDP having a lower glass substrate 12 formed thereon is shown. A mixed gas such as Ne-Xe, He-Xe, or the like is injected into the discharge space 26 provided by the upper and lower glass substrates 10 and 12 and the partition wall 14. The scan and sustain electrode pairs 16 are made of a transparent electrode material such as indium tin oxide (ITO) so as not to block visible light, and include a metal bus electrode for reducing the resistance of the transparent electrode material. . Each of the scan and sustain electrode pairs 16 is formed side by side on the upper glass substrate 10 at a predetermined interval dsus. The scan and sustain electrode pairs 16 maintain a predetermined distance Dsus from adjacent sustain electrodes of the scan and sustain electrode pairs 16 formed in adjacent vertical lines. Here, the distance dsus between the scan and sustain electrode pairs 16 is smaller than the distance Dsus with the sustain electrodes of adjacent lines. The address electrode 22 is formed in a direction orthogonal to the scan and sustain electrode pairs 16. The partition 14 is formed vertically on the lower glass substrate 12 in a direction parallel to the address electrode 22. The partition 14 divides the discharge space 26 and prevents optical and physical crosstalk between the discharge cells. Phosphors 24 are coated on the surfaces of the address electrodes 22 and the partitions 14. The phosphor 24 is excited by ultraviolet rays to generate visible light of any one color of red, green or blue. The spacing Dsus_addr between the address electrode 22 and the scan and sustain electrode pairs 16 is approximately equal to the height of the partition 14 and is much larger than the spacing dsus between the scan and sustain electrode pairs 16.

When a scan pulse is applied to one of the sustain electrodes 16 and a data signal synchronized with the scan pulse is applied to the address electrode 22, the sustain electrode 16 and the address electrode 22 are caused by the voltage difference between the scan pulse and the data signal. An address discharge is generated between them. The discharge cells are selected by this address discharge. A sustain pulse is applied to the scan and sustain electrode pairs 16 following the address discharge. Then, in the discharge cells selected by the address discharge, plasma discharge occurs continuously in accordance with the sustain pulse. At this time, ultraviolet rays (UV) are generated by the discharge, and the ultraviolet rays (UV) excite the phosphors 24 to cause the phosphors 24 to emit light.

However, in the conventional PDP, the distance Dsus_addr between the scan and sustain electrode pair 16 and the address electrode 22 becomes very large as compared with the distance dsus between the scan and sustain electrode pair 16, thereby discharging the discharge at the address discharge. The voltage for starting becomes high. Accordingly, a high driving voltage is required during address discharge and power consumption is large. In addition, since the distance Dsus between the scan and sustain electrode pairs 16 and the sustain electrodes of the adjacent lines is relatively small, interference may occur between the electrodes, and charged particles may flow into the adjacent lines by the diffusion of the plasma discharge. have. In this case, mis-discharge and miss discharge occur in adjacent lines, and the memory margin becomes small. In addition, since the sustain discharge occurring between the scan and sustain electrode pairs 16 is diffused within the 180 degree region, the luminance and discharge efficiency are not satisfactory. In addition, since the discharge space 26 is narrowly limited during discharge, there is a limit in improving luminance and discharge efficiency. When the barrier rib 14 is raised to widen the discharge space 26, the charged particles collide with the barrier rib 14 during the discharge and are lost, thereby increasing the amount of energy loss, thereby increasing the driving voltage and power consumption.

Accordingly, it is an object of the present invention to provide a PDP which increases the aperture ratio for reducing the driving voltage.

Another object of the present invention is to provide a PDP for improving luminous luminance and luminous efficiency.

1 is a perspective view showing a conventional plasma display panel.

2 is a cross-sectional view showing a plasma display panel according to an embodiment of the present invention.

FIG. 3 is a waveform diagram illustrating a driving waveform of the plasma display panel shown in FIG. 2.

4 is a cross-sectional view illustrating a plasma display panel according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: upper glass substrate 12: lower glass substrate

14,34,35: bulkhead 16,36,37: scan and sustain electrode pair

18,38 dielectric layer 20 protective layer

22, 42: address electrode 24, 44: phosphor

26,46: discharge space 34a: head portion

34b: neck portion 36a, 37a: juicer electrode

36b, 37b: auxiliary sustain electrode

In order to achieve the above object, a PDP according to the present invention includes a sustain electrode pair causing a sustain discharge, and an address electrode facing an sustain electrode pair at an interval equal to the interval of the sustain electrode pair to cause an address discharge.

Other objects and features of the present invention in addition to the above objects will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 2 to 4.

Referring to FIG. 2, the upper glass substrate 10, the lower glass substrate 12 on which the address electrode 42 and the phosphor 44 are formed, and the partition walls vertically formed on the lower glass substrates 10 and 12 ( 34 and a PDP in accordance with an embodiment of the present invention having a scan and sustain electrode pair 36 formed on the partition 34 and the upper glass substrate 10. A mixed gas such as Ne-Xe, He-Xe, or the like is injected into the discharge space 46 provided by the upper and lower glass substrates 10 and 12 and the partition wall 34.

The partition wall 34 includes thicker head portions 34a at upper and lower ends, and a neck portion 34b having a narrow width formed stepwise from the head portions 34a. The neck portion 34b widens the central portion of the discharge space 46. When the discharge space 46 is widened, since the plasma discharge region is enlarged during plasma discharge, the ultraviolet rays excite the phosphor 44 to improve brightness and luminous efficiency. This partition 34 is made of glass, glass-ceramic or ceramic material. The partition wall 34 is coated with a glass paste on the lower glass substrate 12, and then a photoresist pattern is formed on the glass paste to repeat the exposure and development processes to form the head 34a and the neck 34b. It can be formed stepped by the forming method. In addition, the partition wall 34 may be formed by first forming the head parts 34a of the upper and lower ends, and then connecting the head parts 34a to the neck part 34b.

The scan and sustain electrode pairs 36 extend from the ends of the main sustain electrodes 36a formed on the surface of the partition wall 34 and the main sustain electrodes 36a and are formed on the upper glass substrate 10. And sustain electrodes 36b. The spacing aa between the auxiliary sustain electrodes 36b and the spacing bb and cc between the main sustain electrodes 36a and the address electrode 42 are equal to each other. Since the intervals bb and cc between the main sustain electrodes 36a and the address electrodes 42 are narrow, the discharge start voltage during address discharge becomes low. Even when the height of the partition wall 34 is changed by the scan and sustain electrode pairs 36, the distance aa between the auxiliary sustain electrodes 36b and the distance between the main sustain electrodes 36a and the address electrode 42 ( Since bb and cc) remain the same, the energy lost in the partition wall 34 is reduced and no voltage rise is caused. These scan and sustain electrode pairs 36 may be simultaneously formed on the barrier rib 34 and the upper glass substrate 10 using a method of vacuum depositing electrode materials using an electron beam (E-beam). The scan and sustain electrode pairs 36 may form auxiliary sustain electrodes 36a as transparent electrodes (or transparent electrodes and metal electrodes), and may form main sustain electrodes as metal electrodes.

On the other hand, the interval between the sustain electrodes of the adjacent line is the distance aa between the auxiliary sustain electrodes 36b and the interval between the main sustain electrodes 36a and the address electrode 42 by the width of the partition wall 34. , cc).

On the scan and sustain electrode pairs 36, a dielectric layer (not shown) in which wall charges accumulate upon discharge, and a protective layer for protecting the scan and sustain electrode pairs 36 and the dielectric layer from sputtering of charged particles generated by the discharge. (Not shown) may be stacked.

The scan and sustain electrode pairs 36 extend to the partition wall 34 and the upper glass substrate 10 to increase the electrode length, and plasma discharge is generated between the auxiliary sustain electrodes 36b during the sustain discharge to 360 °. Is expanded.

When the PDP according to the present invention is driven by ADS (Address and Display Seperated), as shown in Fig. 3, a reset period for initializing the full screen, an address period for writing data while scanning the full screen in a sequential manner, and data It is divided into a sustain period for maintaining the light emission state of the cells. In the reset period, the screen is initialized by a reset pulse applied between the common sustain electrode line Z and the address electrode line X among the sustain electrode line pairs Y and Z, and the scan / sustain electrode line Y in the address period. ) Is sequentially applied and data is supplied to the address electrode line X in synchronization with the scanning pulse. In the sustain period, a sustain pulse is applied to the scan / sustain electrode line (Y) and the common sustain electrode line (Z). This sustain period is driven when one frame is divided into a plurality of subfields according to the luminance relative ratio, and the reset period and the address period are the same in each subfield, while the sustain period is 2 ⁿ (each subfield according to the luminance relative ratio). n = 0,1,2,3,4,5,6,7). As described above, since the sustain period is different in each subfield, the gray level of the image is expressed by adjusting the sustain period of each subfield, that is, the number of sustain discharges.

Plasma discharge during the sustain discharge is generated horizontally between the auxiliary sustain electrodes 36b and is evenly spread in the discharge space 46 in the 360 ° direction. As a result, the amount of ultraviolet rays generated by the plasma discharge increases, so that the brightness and the discharge efficiency are improved.

Referring to FIG. 4, the upper glass substrate 10, the lower glass substrate 12 on which the address electrode 42 and the phosphor 44 are formed, and vertically on the lower glass substrate 12 so that a step does not exist. A PDP according to another embodiment of the invention is shown having a partition 35 formed thereon and a scan and sustain electrode pair 37 formed on the partition 35 and the upper glass substrate 10. A mixed gas such as Ne-Xe, He-Xe, or the like is injected into the discharge space 46 provided by the upper and lower glass substrates 10 and 12 and the partition wall 35. The address electrodes 42 and the phosphors 44 formed on the lower glass substrate 10 are the same as those shown in FIG.

The partition wall 35 is formed so that a step is not formed as in the prior art, and may be formed by a general partition wall manufacturing method, for example, a screen printing method, an addition method, a sand blast method, a mold method, etc., thereby simplifying the manufacturing method.

The scan and sustain electrode pair 37 extends from the ends of the main sustain electrodes 37a and the sustain electrodes 37a formed on the surface of the partition wall 35 and is formed on the upper glass substrate 10. And sustain electrodes 37b. The spacing aa between the auxiliary sustain electrodes 37b and the spacing bb and cc between the main sustain electrodes 37a and the address electrode 42 are equal to each other. As a result, the address discharge voltage between the sustain electrode 37 and the address electrode 42 and the sustain discharge voltage between the scan and sustain electrode pairs 37 are lowered, and the angle is 360 ° in the discharge space 46 during the sustain discharge. The plasma discharge can be diffused. The scan and sustain electrode pairs 37 may be simultaneously formed on the barrier 35 and the upper glass substrate 10 by using a method of vacuum depositing an electrode material using an electron beam (E-beam).

As described above, in the PDP according to the present invention, the distance between the scan and sustain electrode pairs and between the sustain electrode and the address electrode is the same, thereby lowering the driving voltage. Furthermore, the present invention increases the spacing between adjacent electrodes, thereby minimizing interference between electrodes, thereby reducing mis-discharge and mis-discharge, and improving uniformity. In addition, in the PDP according to the present invention, the sustain discharge is diffused at an angle of 360 ° in the discharge space to enlarge the discharge region, thereby improving the luminance and the luminous efficiency.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (4)

A sustain electrode pair causing a sustain discharge, And an address electrode facing the sustain electrode pair at an interval equal to the gap between the sustain electrode pairs to cause an address discharge. The method of claim 1, An upper substrate on which the sustain electrode pairs are formed; A lower substrate on which the address electrode and the phosphor for generating visible light are formed; And a partition wall formed between the lower substrate and the lower substrate to form the sustain electrode pair. The method of claim 2, The partition wall is a plasma display panel, characterized in that the step is formed. The method of claim 2, The partition wall may include a first partition wall having a thick width at upper and lower ends thereof; And a second barrier rib formed to be stepped from the first barrier rib and having a narrow width at an intermediate portion thereof.