JPH11273572A - Manufacture of plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To put out an abnormal light emitting cell by forming plural cells between a first substrate forming a display electrode composed of transparent electrodes and a metallic electrode and a second substrate oppositely arranged to this. SOLUTION: Electric charge is accumulated on the surface of a protective layer 8 through transparent electrodes 5 by impressing voltage between two bus electrodes 6 in a single cell. There, discharge is performed between the two transparent electrodes 5 in the cell by impressing pulse voltage not less than critical voltage by a data electrode 9 so as to excite a phosphor 12 by emitting the ultraviolet light by exciting rare gas in a discharge space 13 by energy to display a color image. When a YAG laser beam 21 is applied to a required laser irradiation area of an abnormal light emitting cell found by a lighting inspection of this plasma display panel, the transparent electrodes 5 of the area deteriorate by heat absorbing energy, and are turned into high resistance, and are put in the same state of substantially expanding an interelectrode distance of the abnormal light emitting cell. Therefore, discharge starting voltage increases, so that this abnormal light emitting cell is put out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plasma display panel.

[0002]

2. Description of the Related Art Plasma display panels (hereinafter, referred to as plasma display panels)
The “PDP” is formed by sealing a rare gas containing xenon in a cell formed between two substrates on which electrodes and the like are formed, and then sealing the cell. After this sealing, extraordinary emission of cells, commonly referred to as "bright spots", may be found, in which some cells shine at a much higher intensity than others. These bright spots are very conspicuous when the PDP is displayed with low brightness or when the PDP is displayed in a single color and the bright spot is a color other than the single color.

[0003]

SUMMARY OF THE INVENTION However, PDP
So far, no method has been invented to eliminate such cells that emit abnormal light.

[0004]

In order to solve this problem, a method for manufacturing a plasma display panel according to the present invention comprises a first substrate on which a display electrode comprising a transparent electrode and a metal electrode is formed; A method for manufacturing a plasma display panel in which a plurality of cells are formed between a second substrate and an opposing second substrate, wherein the abnormal light emitting cells among the cells are turned off.

Further, in this plasma display panel manufacturing method, a display electrode comprising a transparent electrode and a metal electrode is formed on the first substrate, and the first substrate is provided on the transparent electrode corresponding to the abnormal light emitting cell. And a laser beam having a wavelength that can be absorbed by the transparent electrode.

According to this method, cells emitting abnormal light can be eliminated, and the production yield can be improved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a method of manufacturing a PDP according to an embodiment of the present invention. As shown in FIG. 1, a PDP 1 is obtained by bonding a front substrate 2 and a rear substrate 3 together.
The laser beam 21 generated from the laser condensing / irradiating unit 20 is applied from the front side of the front substrate 2 (panel lighting display surface side) to a necessary area of the abnormal light emitting cell found in the PDP lighting inspection (laser irradiation area 4). The light is focused and irradiated.

FIG. 2 is a view of the laser irradiation area 4 and its peripheral area shown in FIG. FIG. 3 is a sectional view taken along line AA ′ of FIG. 2 and shows a state where the laser beam 21 is irradiated.

As shown in FIG. 2 or FIG.
A transparent electrode 5 and a bus electrode 6 are formed thereon, and a dielectric layer 7 made of glass and a protective layer 8 made of MgO are laminated so as to cover the transparent electrode 5 and the bus electrode 6. The bus electrode 6 for facilitating current flow is made of Cr.
-A transparent electrode 5 made of a low-resistance metal film layer such as Cu-Cr and securing a discharge area is made of a transparent electrode having relatively high resistance such as tin oxide.

On the back substrate 3, a band-shaped data electrode 9 made of silver is formed, and a dielectric layer 10 made of glass is formed so as to cover the data electrode 9. Dielectric layer 10
A strip-shaped partition 11 is provided between the adjacent data electrodes 9, and a phosphor 12 is provided from above the dielectric layer 10 to the side surface of the partition 11. The discharge space 13 between the front substrate 2 and the back substrate 3 is filled with a rare gas containing xenon. A region surrounded by a broken line represents one cell 14.

When a voltage is applied between two bus electrodes 6 in one cell 14, charges are accumulated on the surface of the protective layer 8 via the transparent electrode 5. When a pulse voltage exceeding the critical voltage is applied thereto by the data electrode 9, 2
Discharge occurs between the two transparent electrodes 5. This discharge excites the rare gas filling the discharge space 13 to emit ultraviolet light. This ultraviolet light causes the phosphor 12
Is excited to emit fluorescent light in each of red, green, and blue, whereby a color image is displayed on the PDP.

Next, a method for eliminating the abnormally emitting cells 14 will be described. In the present embodiment, CW-YA
G laser is condensed into a circular shape having a diameter of about 20 μm, and the laser irradiation area 4 in the cell 14 that emits abnormal light
(250 μm × 400 μm), the entire surface was irradiated with a scan so as to be irradiated with a laser. As a result, the cell 14 that had abnormally emitted light stopped emitting light at all, and the cell 14 could be turned off.

As a result of observation with an optical microscope, the color of the transparent electrode made of tin oxide existing in the laser-irradiated area 4 changed by the laser is changed. When the discolored portion is analyzed, the tin oxide is deteriorated and cannot be measured. The higher the resistance.

In the PDP having this structure, the discharge starting voltage of the cell is defined by the distance between the transparent electrodes included in the cell. That is, when the distance between the transparent electrodes is large, the firing voltage is high, and when the distance between the transparent electrodes is small, the firing voltage is low. Here, if the distance between the transparent electrodes is extremely increased in some cells, the discharge starting voltage increases in the cells, and the discharge is not generated by the voltage applied to the bus electrodes.

Considering this, in the PDP having the structure shown in FIGS. 2 and 3, when the laser irradiation area 4 in the cell 14 that emits abnormal light is irradiated with the YAG laser, the transparent electrode in the laser irradiation area 4 becomes Since the laser energy is absorbed and the resistance is changed by heat to increase the resistance, the distance between the electrodes of the cell 14 that emits abnormal light is substantially increased. For this reason, it is considered that the cell 14 becomes unlit because the discharge starting voltage is increased.

Next, the behavior of the irradiated laser will be described. As shown in FIG. 3, the laser beam 21 irradiated from the front side of the front substrate 2 reaches the transparent electrode 5 with little energy absorption in the front substrate 2 and is heated by the transparent electrode 5 absorbing the laser energy. Therefore, it can be assumed that the transparent electrode 5 is deteriorated. The power of the laser beam 21 absorbed by the transparent electrode 5 is reduced, and the laser beam 21 is hardly absorbed by the dielectric layer 7 thereabove. Almost no bubbles are formed. Therefore, when the PDP is driven, the dielectric layer 7
Does not cause dielectric breakdown.

The same effect can be obtained when pulse irradiation is performed so that the spot of the single pulse oscillation YAG laser irradiates the laser irradiation area 4 instead of scanning irradiation of the CW-YAG laser.

FIG. 4 shows a thin film of tin oxide as a transparent electrode material and I
This is data obtained by summing the spectral transmittance and spectral reflectance of a TO (Indium Tin Oxide) thin film at each wavelength, and indicates that light in a region where this value is low is absorbed. Curve a is the case of the tin oxide thin film, curve b is the case of the ITO thin film, and the thickness of each film is 0.1 μm. From these results, absorption was observed at a wavelength of 1 μm to 3 μm in any of the films. The wavelength of the YAG laser is 1.064 μm as shown by the broken line in FIG. 4, which is within a range where this absorption is recognized. Therefore, by using a YAG laser, the transparent electrode can absorb the laser energy to change the quality of the transparent electrode.

The main cause of the deterioration of the transparent electrode is absorption of laser energy by the transparent electrode. In the above embodiment, the case where the YAG laser is used has been described. However, any other laser can be used as long as it has a wavelength that can be absorbed by the transparent electrode.

[0021]

As is apparent from the above description, according to the method for manufacturing a plasma display panel of the present invention, it is possible to turn off a cell that emits abnormal light to make it inconspicuous. In addition, since a laser having a wavelength that is absorbed by the transparent electrode is used, the dielectric layer hardly absorbs laser energy, so that dielectric breakdown due to thermal breakdown of the dielectric layer does not occur, and the manufacturing yield of the plasma display panel is improved. Is what you can do.

[Brief description of the drawings]

FIG. 1 is a diagram showing a method of manufacturing a PDP according to an embodiment of the present invention.

FIG. 2 is a diagram showing a laser irradiation area and its surrounding area.

FIG. 3 is a sectional view taken along line A-A ′ of FIG. 2;

FIG. 4 is a view showing spectral optical characteristics of a transparent electrode thin film.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plasma display panel 2 Front substrate 3 Back substrate 4 Laser irradiation area 5 Transparent electrode 6 Bus electrode 7, 10 Dielectric layer 8 Protective layer 9 Data electrode 14 Cell 20 Laser condensing irradiation unit 21 Laser beam

Claims (3)

[Claims] 1. A plasma display panel having a plurality of cells formed between a first substrate on which a display electrode composed of a transparent electrode and a metal electrode is formed, and a second substrate opposed to the first substrate. A method for manufacturing a plasma display panel, wherein an abnormal light emitting cell among the cells is turned off. 2. A display electrode comprising a transparent electrode and a metal electrode is formed on a first substrate, and a wavelength that is absorbed by the transparent electrode through the first substrate to the transparent electrode corresponding to an abnormal light emitting cell. 2. The method for manufacturing a plasma display panel according to claim 1, wherein the laser light is irradiated. 3. The method for manufacturing a plasma display panel according to claim 2, wherein laser light is irradiated using a YAG laser.