JP2000357459A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce electron annihilation in high frequency discharge and provide high discharge efficiency, by providing barrier plates spaced by same distance around a crossing point between a first and second electrodes of high frequency discharge PDP. SOLUTION: First, an entire surface is initialized in a reset period, and then in an address period a cell is selected with discharge between an address electrode 44 and a scan electrode 48. This selected cell is displayed with an image by vibration motion of electrons in a sustaining period. At this time, a high frequency signal is applied to a high frequency electrode 58, and a direct current bias voltage at a predetermined level is applied to the scan electrode 48. This high frequency signal causes an electron in a cell to vibrate in a discharge space with high frequency signal polarization. These vibrating electron and charge particle do not collide with a barrier plate 54, because the barrier plate 54 transversely and longitudinally separates by same distance from a crossing point between the scan electrode 48 and the high frequency electrode 58. The electron vibration continuously ionizes discharge gas. Vacuum ultraviolet generated with this discharge excites a phosphor, transits the phosphor, and generates visible light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display, and more particularly, to a plasma display panel having improved discharge efficiency and brightness.

[0002]

2. Description of the Related Art Plasma display panels (hereinafter "P")
DP ") displays an image including characters or graphics by causing the phosphor to emit light by ultraviolet light of 147 nm generated when He + Xe or Ne + Xe gas is discharged. Such a PDP can be easily made thinner and larger. Not only that, the image quality has been greatly improved by the recent development of technology.This PDP is largely divided into DC type and AC type.The DC type PDP is opposed between the anode and the cathode formed on the front substrate and the rear substrate respectively. On the other hand, an AC type PDP applies an AC voltage signal between electrodes disposed between dielectric layers for accumulating wall charges and generates a half-period of the signal. An image is displayed such that a discharge occurs each time.
The memory effect appears due to the use of a dielectric layer in which wall charges are accumulated on the surface during discharge.

A conventional AC PDP will be described with reference to FIG. The AC PDP includes a front substrate (1) on which a sustain electrode (10) is formed, and a rear substrate (2) on which an address electrode (4) is formed. The front substrate (1) and the rear substrate (2) are arranged in parallel with a partition (3) therebetween. Ne-Xe, He-Xe is provided in the discharge space provided by the front substrate (1), the rear substrate (2) and the partition (3).
Is injected. The sustain electrodes (10) use two pairs arranged in parallel in one plasma discharge channel. One of the sustain electrode pairs (10) causes an address discharge together with the address electrode (4) in response to a scan pulse supplied during the address period. The other is used to generate a surface discharge with one electrode that has generated the address discharge during the sustain period after the address discharge. That is, the other sustain electrode (10) is used as a common sustaining electrode. A dielectric layer (8) and a protective layer (9) are laminated on the surface of the front substrate (1) on which the sustain electrode pairs (10) are formed. The dielectric layer 8 serves to limit the plasma discharge current and accumulate wall charges during discharge. The protective film (9) is for preventing the dielectric layer (8) from being damaged by sputtering generated at the time of plasma discharge and increasing the emission efficiency of secondary electrons. This protective film (9) is usually magnesium oxide (MgO). On the rear substrate (2), a partition (3) for defining a discharge space is formed so as to extend vertically. On the surfaces of the back substrate (2) and the partition (3), a phosphor (5) that is excited by vacuum ultraviolet rays and generates visible light is formed.

In such an AC type PDP, one frame is composed of a number of subfields, and a gray scale is realized by a combination of the subfields. For example, to realize 256 gray scales, one frame period is divided into eight subfields. In each case, each of the eight subfields is further divided into a reset period, an address period, and a sustaining period. During the reset period, the entire screen is initialized. In the address period, a cell in which data is displayed is selected by an address discharge. The discharge of the selected cell is maintained during the sustaining period. The sustaining period is 2 depending on the weight of each subfield.
^It becomes longer by the period corresponding to ⁿ . That is, the first to eighth
Sustaining period included in each sub-field, 2 ^0, 2 ^{1, 2} 2, 2 ^3, 2 ^4, 2 ^5, 2 ^6, 2 ⁷ becomes longer in a ratio of. For this reason, the number of sustaining pulses generated during the sustaining period depends on the subfield.
2 ^0, 2 ^{1, 2} 2, 2 ^3, 2 ^4, 2 ^5, increased to 2 ^6, 2 ^7.
The combination of these subfields determines the luminance and chromaticity of the display image.

In such an AC type PDP, the sustain electrode pair (10) has a duty ratio of 1,
A sustaining pulse having a frequency of 00 kHz and a width of about 10 to 20 μs is alternately supplied. The sustain discharge generated between the sustain electrode pair (10) in response to the sustaining pulse is generated in a very short time per sustain pulse.
Occurs each time. The charged particles generated by the sustaining discharge are generated according to the polarity of the sustaining electrode pair (10).
Along the discharge path, and accumulates in the upper dielectric layer (8), leaving wall charges. The wall charges lower the driving voltage during the next sustain discharge, but reduce the electric field in the discharge space during the sustain discharge. As a result, the sustain discharge occurs only once at a very short moment compared to the width of the sustain pulse, and most of the remaining time is consumed in preparation for wall charge formation and the next discharge. As a result, in the conventional AC PDP, the actual discharge period is shorter than the entire discharge period, so that the luminance and the discharge efficiency have to be reduced.

[0006] In order to solve the problems of low brightness and discharge efficiency of AC type PDPs, a high frequency PDP (Radio Fraction PDP) which generates a sustain discharge using a high frequency discharge of several tens to several hundreds MHz is used.
equency PDP (hereinafter referred to as “RFPDP”) has been proposed.

Referring to FIGS. 2 and 3, RFPDPD
In P, pixel cells (32) including three sub-pixel cells (34) formed in a rectangular shape for displaying red, green, blue, and green, respectively, are arranged in a matrix. Each sub-pixel cell (34) is arranged such that the address electrode (14) and the scan electrode (18) are orthogonal to the front substrate (12), and the scan electrode (1) is further disposed on the rear substrate (30).
A high-frequency electrode (28) is formed alongside 8). A dielectric layer (16) is formed between the address electrode (14) and the scan electrode (18) for insulation between these electrodes. A dielectric layer (20) and a protective film (22) are stacked on the back substrate side above the scan electrode (18). A dielectric layer (2) is provided on the rear substrate (30) on which the high-frequency electrode (28) is formed.
9) is formed flat, and a partition wall (24) is formed thereon. A phosphor (26) is applied to the surfaces of the partition wall (24) and the lower dielectric layer (26).

[0008] The RFPDP displays an image in many combinations of subfields including a reset period, an address period, and a sustaining period. During the reset period, the entire screen is initialized. Subsequently, in the address period, a cell is selected by a discharge between the address electrode (14) and the scan electrode (18). The selected cell displays an image by vibrating electrons during the sustaining period. At this time, a high-frequency signal of several tens to several hundreds MHz is applied to the high-frequency electrode (28), and a DC bias voltage of a predetermined level is applied to the scan electrode (18). The high frequency signal causes the electrons in the cell to vibrate according to the polarity of the high frequency signal, and the discharge gas is continuously ionized. The vacuum ultraviolet rays generated by this discharge excite the phosphor (26), and the phosphor (26) is transited to generate visible light. Thus R
FPDP uses a high-frequency signal to continuously generate a discharge during the sustaining period.
Luminance and discharge efficiency are higher than P.

However, the RFPDP has a problem that electrons collide with the partition wall (24) and are extinguished depending on the cell structure. That is, the red, green, and red pixels included in the pixel cell (32)
Each of the blue and green sub-pixel cells (34) is a rectangle that is smaller in the horizontal direction than in the vertical direction. The discharge spreads in such a sub-pixel cell (34), and some of the electrons collide with the vertically spaced partition walls (24a). The electrons that collide with the partition (24a) recombine and disappear. As described above, when the amount of electrons for ionizing the discharge gas decreases, the discharge efficiency and the brightness decrease. In particular, a PDP that displays an image by facing discharge, such as an RF PDP or a DC PDP, has more charged particles that collide with partition walls and disappear, as compared with an AC PDP that displays an image by surface discharge. As a result, in order to obtain satisfactory luminance, the power of the high-frequency signal supplied to the RFPDP must be increased. Therefore, the power consumption increases accordingly. In order to reduce the discharge efficiency and reduce the excessive power consumption, the RFPDP requires a certain distance between the plasma and the partition wall 24a, that is, the RFPDP.
Debye distance must be maintained. That is, in the plasma, the voltage is stably maintained by the diffusion of electrons, but the electric field is disturbed by the loss of electrons between the plasma and the partition (24). In RFPDP, the Debye distance λD is expressed by the following equation (1).

Λ _D = [kT _e ε ₀ / (ne2)] 1/2 (1)

Here, k is Brewtzman constant, Te is electron temperature, ε ₀ is dielectric constant, n is plasma density, and e is electric charge. Plasma density ^{n = 10 10 / cm 3,} kT e = 2eV When Debye length lambda _D becomes approximately 100μm approximately. The distance that the electric field is disturbed between the outer walls by the plasma is generally 1
Also known as the two Debye distance. Therefore, RF
The minimum distance required between the PDP plasma and the partition surface is roughly 3
It is about 00 μm. Considering the minimum distance between the plasma and the partition wall surface and the volume of the plasma itself of 200 μm, in order to maintain the discharge at a low voltage, the distance between the mutually facing partition walls (24) must be at least 500 μm or more. No. However, 40 "VGA resolution PDPs
In the case of, the distance between the two partition walls (24a) in the vertical direction is approximately 3
The required minimum distance between the partition walls is about 70 μm and 500
Since it is smaller than μm, a high voltage needs to be applied to the electrodes in the cell to maintain the discharge.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide a PDP with improved discharge efficiency and brightness.

[0013]

A PDP according to the present invention is characterized in that the PDP includes a partition wall which is equidistantly spaced from an intersection of first and second electrodes for generating a high frequency discharge of the PDP. A PDP according to the present invention includes a sub-pixel cell for generating red, green, and blue light, and a pixel cell having the same configuration as the sub-pixel cell including the sub-pixel cell. P according to the invention
The DP includes a discharge cell provided with a discharge space, a honeycomb-shaped partition wall for separating each of the discharge cells in a honeycomb form, and at least two or more electrodes for generating a discharge in the pixel cell. I do.

[0014]

The RFPDP according to the present invention has partitions at equal distances from the center point where high-frequency discharge occurs, so that disappearance of electrons and the like during high-frequency discharge is reduced and discharge efficiency can be increased. By including red, green, blue, and green sub-pixel cells in one pixel cell so that the shape that partitions the pixel cell is the same as the outer shape of the set of the sub-pixel cells, for example, a square When a sub-pixel cell is used, four sub-pixels are required, and two blue sub-pixel cells can be included in one pixel cell, so that color purity can be improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.
This will be described in detail with reference to FIG. Referring to FIG. 4, the RFPDP according to the present invention has pixel cells (72) including four sub-pixel cells (74) formed in a square shape and arranged in a matrix shape. Each sub-pixel cell (74) serving as a discharge cell is arranged in parallel with the front substrate (42) in which the address electrode (44) and the scan electrode (48) are formed orthogonal to each other, and the scan electrode (48). Substrate (60) on which high-frequency electrode (58) is formed
And A dielectric layer (46) is formed between the address electrode (44) and the scan electrode (48) for insulation between these electrodes. A dielectric layer (50) and a protective film (52) are stacked on the scan electrode (48). A dielectric layer (59) is formed flat on the rear substrate (60) on which the high-frequency electrode (58) is formed, and a square partition (54) is formed thereon. The four surfaces of the lattice type partition (54)
In order to minimize charged particles that collide with the partition wall (54) during the opposing discharge between the scan electrode (48) and the high-frequency electrode (58), the intersection of the scan electrode (48) and the high-frequency electrode (58) is centered. Are formed so as to have the same distance. The partition wall (54) is not limited to a square, but may be a scan electrode (48) and a high-frequency electrode (5).
8) It can be formed in various forms such as a circle having the same distance around the intersection where it intersects and a honeycomb shape. The distance between the partition walls facing each other in the horizontal or vertical direction (D
h1 and Dy1) are preferably set to a minimum distance of 500 μm or more at which the discharge can be maintained at a low voltage. A phosphor (56) is applied to the surfaces of the partition wall (54) and the lower dielectric layer (56).

The sub-pixel cells (74) included in one pixel cell (72) are arranged so as to display red, green, blue, and green (R, G, B, and G) clockwise, respectively. . The pixel cell (72) thus configured includes two green sub-pixel cells (G), and when the luminance ratio of red light: green light: blue light is 3: 6: 1, white of high purity is obtained. Light can be generated. The higher the purity of white light, the higher the color purity.

The RFPDP according to the present invention displays an image in a combination of a number of subfields including a reset period, an address period, and a sustaining period. First, the entire screen is initialized during the reset period. Subsequently, in the address period, a cell is selected by a discharge between the address electrode (44) and the scan electrode (48). The selected cell displays an image by vibrating electrons during the sustaining period. At this time, a high frequency signal of several tens to several hundreds MHz is applied to the high frequency electrode (58), and a DC bias voltage of a predetermined level is applied to the scan electrode (48). The high frequency signal causes the electrons in the cell to vibrate in the discharge space according to the polarity of the high frequency signal. The electrons or charged particles vibrating in this manner are separated by the partition wall (54) at the discharge center point, that is, the scan electrode (48) and the high frequency electrode (5).
Since it is equidistant in the horizontal and vertical directions from the intersection 8), it hardly hits the partition wall (54). The discharge gas is continuously ionized by the vibrational motion of the electrons. Vacuum ultraviolet rays generated by such discharge discharge phosphor (5).
6) is excited, and the phosphor (56) is transitioned to generate visible light.

FIG. 6 shows an RFP according to another embodiment of the present invention.
DP. Referring to FIG. 6, the RFPD according to the present invention
P comprises a sub-pixel cell (92) formed in a hexagonal form. Each sub-pixel cell (92) has an address electrode (8
2) a front substrate formed with the scan electrodes (86) orthogonal to each other; and a rear substrate formed with a high-frequency electrode (90) alongside the scan electrodes (86). The partition (84) formed between the sub-pixel cells (92) is formed in a regular hexagon, that is, in a honeycomb shape. The six surfaces forming one honeycomb-shaped partition wall (84) are equidistant about the intersection of the scan electrode (86) and the high-frequency electrode (90). The distance (Dh2, Dv2) between the mutually facing partition surfaces of the partition (84) is larger than that of the lattice type partition (54) shown in FIG. 4 in the same resolution view, so that the discharge is maintained at a lower voltage. Can be done.

[0019]

As described above, the PDP according to the present invention includes red, green, blue, and green square sub-pixel cells in one pixel cell, and a discharge center point in each sub-pixel cell. On the other hand, the partition walls are equally spaced in the horizontal and vertical directions. Therefore, the possibility that electrons vibrating during high-frequency discharge will collide with the partition walls is reduced, and discharge efficiency and luminance can be increased. At the same time, the PDP according to the present invention can reduce power consumption as discharge efficiency and luminance increase. In addition, a pixel cell including a square sub-pixel cell is formed in the same square shape as the sub-pixel cell, and one pixel cell can include two green sub-pixel cells, thereby improving color purity.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a conventional AC plasma display panel.

FIG. 2 is a plan view illustrating a conventional high-frequency plasma display panel.

FIG. 3 is a cross-sectional view of the high-frequency plasma display panel taken along a line AA ′ in FIG. 2;

FIG. 4 is a plan view illustrating a high-frequency plasma display panel according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a high-frequency plasma display panel according to an embodiment of the present invention.

FIG. 6 is a plan view of a high frequency plasma display panel according to another embodiment of the present invention.

[Explanation of symbols]

 1, 12, 42: Front substrate 2, 30, 60: Back substrate 3, 24, 54, 84: Partition wall 4: Address electrode 5, 26, 56: Phosphor 8, 16, 16, 26, 59: Dielectric layer 9 : Protective layer, protective film 10: sustain electrode, sustain electrode pair 14, 44, 82: address electrode 18, 48, 86: scan electrode 24 a: partition wall 28, 58, 90: high frequency electrode 32, 72: pixel cell 34, 74 , 92: Sub-pixel cell

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Jun Wong Kang South Korea, Seoul, Yongsan-ku-Richeon-dong, (No address), Hanggram Apartment, 212-1503

Claims (12)

[Claims] 1. A plasma display panel comprising a first electrode and a second electrode formed on a front substrate and a rear substrate so as to be opposed to each other and causing an opposite discharge, wherein a partition partitioning a discharge cell includes: A plasma display panel having surfaces equidistant about an intersection of the first and second electrodes. 2. The plasma display as claimed in claim 1, wherein the partition is a square partition which is separated from the intersection of the first and second electrodes at equal distances in the horizontal and vertical directions. panel. 3. The partition wall has a minimum of 50 facing surfaces.
3. The plasma display panel according to claim 2, wherein the distance is 0 μm. 4. The plasma display panel according to claim 1, wherein a high-frequency signal is supplied to one of the first electrode and the second electrode. 5. The plasma display panel according to claim 1, wherein the partition is formed in one of a square, a circle, and a honeycomb. 6. The pixel cell is composed of a plurality of sub-pixel cells, each of which is a discharge cell for generating red, green, and blue light, and each sub-cell has an overall shape that defines the pixel cell. A plasma display panel having the same outer shape. 7. The plasma display panel of claim 6, wherein the sub-pixel cells are formed in a square shape. 8. The plasma display panel according to claim 6, wherein the pixel cells include two green sub-pixel cells for generating green light. 9. A red sub-pixel cell for generating red light, a first green sub-pixel cell for generating green light, a blue sub-pixel cell for generating blue light, and a second sub-pixel for generating green light in the pixel cells. 9. The plasma display panel according to claim 8, wherein the pixel cells are arranged so as to circulate clockwise. 10. A discharge cell provided with a discharge space, a honeycomb-shaped partition separating each of the discharge cells in a honeycomb form, and at least two or more electrodes for generating a discharge in the discharge cell. A plasma display panel comprising: 11. The plasma display panel according to claim 10, wherein the electrode includes a first electrode to which a high-frequency signal is applied, and a second electrode for generating a discharge together with the first electrode. 12. A minimum of 50 of said partition walls facing each other.
11. A distance of 0 .mu.m is maintained.
The described plasma display panel.