JP3480175B2 - Method for forming partition of display panel - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a partition of a display panel. As shown in the perspective view of FIG. 4, for example, a surface discharge type color plasma display panel, which is one of the display panels, has electrodes facing each other at right angles to each other, that is, a pair of X, Y sustain electrodes 1a-1, 1 on one side. 1a-2
And an insulating layer 1b, and two glass substrates provided with address electrodes 2a on the other side, ie, front and rear substrates 1 and 2, with a strip-shaped partition (rib) 2b interposed therebetween so as to face and separate from each other. The part is sealed. The partition wall 2b is formed in a strip shape on the rear substrate 2 so as to be parallel to the address electrodes. The partition wall 2b defines a gap of the discharge space formed between the substrates 1 and 2, and defines the discharge space. The partitions are separated into respective discharge cells (unit discharge spaces). The address electrodes 2a are provided in the grooves between the strip-shaped partitions 2b, respectively, and the red R, green G, and blue B phosphor layers 3 are sequentially arranged one by one on the partition surfaces including the surface of the address electrodes 2a. Is formed. Recently, there has been a demand for a method of easily forming a partition having a smaller width and pitch on a substrate in order to obtain a finer image. 2. Description of the Related Art As shown in the side sectional views of FIGS. 2A, 2B, 2C and 2D, a conventional method for forming a partition of a display panel is shown in FIG. After screen-printing a glass paste to be a partition on the substrate 2, a thickness of 200 μm is obtained by drying.
Then, a photo-curable film-like resist 22 is laminated on the insulating layer 21. In FIG. 1B, the photocurable film-like resist 22 is patterned by a known photolithography technique with a width of about 100 μm and a pitch of about 400 μm to form a mask for a partition to be formed. Next, in FIG. 1C, the insulating layer 21 exposed without being masked is removed by sandblasting 20 to form a groove 2b-1.
The photo-curable film-like resist 2 used as a mask
2 is dissolved and removed with sodium carbonate (not shown) and then washed and dried to form the partition 2b. [0007] However, according to such a method of forming a partition, the bottom of the partition 2b is skirted and becomes trapezoidal as shown in FIG. In order to suppress this, if sand blasting is sufficiently performed in FIG. 2 (c), the lower part masked as shown in the side sectional views of FIGS. 3 (a) and 3 (b) is hollowed out, and the bottom is skirted. In other words, there is a problem that a trapezoidal shape cannot be formed to form a partition wall having a small width and a small pitch, and in the worst case, a central portion of the partition wall is cut off to be thin and cut. In view of the above problems, an object of the present invention is to provide a method of forming partition walls of a display panel which can easily form partition walls having a smaller width and a smaller pitch in order to obtain a finer image. In order to achieve the above object, the present invention provides a method of forming a partition on a substrate constituting a display panel according to the present invention, wherein a thermosetting insulating material for forming a partition is formed on the substrate. Forming an insulating layer made of a material, irradiating a laser beam to the surface of the insulating layer, and thermally curing only a portion serving as a partition to pattern the partition, and sandblasting the patterned insulating layer. And removing the uncured portion to form a partition with the thermosetting portion remaining. In the insulating layer formed of a thermosetting insulating material, a boundary between a thermosetting portion serving as a partition and an uncured portion serving as a groove between the partitions can be formed perpendicular to the substrate surface, and the thermosetting portion can be formed by a laser. Since patterning is performed with high definition by light, if this is subjected to sandblasting, the side wall surface of the remaining thermosetting portion (partition) is formed perpendicular to the substrate surface, and the width and pitch are smaller. Partition walls can be formed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail in the order of steps with reference to the side sectional views of FIGS. 1 (a), 1 (b), 1 (c) and 1 (d). I do. First, in FIG. 1A, a thermosetting insulating material is printed on the substrate 2 at a thickness of 200 μm (corresponding to the height of the partition) to form an insulating layer 11 for forming the partition. Next, in FIG. 2B, the insulating layer 11 is scanned and irradiated with a laser beam 12, and only the portions (shaded portions) which become the partition walls are thermally cured, thereby patterning the strip-shaped partition walls. The diameter of the beam spot of the laser beam 12 for irradiation is
Scanning is performed at a speed at which the insulating layer 11 is heated to the thermosetting temperature in accordance with the width of the partition to be formed. The irradiation with the laser beam 12 was performed by scanning and heating a portion serving as one partition, or exposing only a portion serving as a plurality of partitions by enlarging the laser beam diameter and covering a certain region with a light-shielding mask. It may be heated all at once. Next, in FIG. 1C, a thermosetting portion 11-1 serving as a partition and an uncured portion 11 serving as a groove between the partitions are shown.
Sandblast 1 on the surface of the insulating layer 11 partitioned into -2
0 processing is performed. The sandblasted particles are heat-cured portions 11
-1 and higher than the hardness of the uncured portion 11-2.
Particles of 28 μm are adopted and the blast pressure is 2 kg /
Sandblasting is performed under the conditions of about 2 cm ² and a transfer speed of the substrate 2 of about 90 mm / min. Thereby, the uncured portion 11-2 is scraped off to form the groove 2b-1, and the partition wall 2b is formed while leaving only the thermoset portion 11-1.
Although sandblasting is illustrated as being performed from above the uncured portion 11-2, a plurality of partitions in a certain wide area may be performed collectively. As described above, since the insulating layer formed of the thermosetting insulating material has a very small thickness of 200 μm, when the laser beam is scanned and irradiated and heated, the insulating layer is formed between the hardened portion serving as the partition and the partition. Patterning is performed so that the boundary between the groove and the uncured portion is divided perpendicular to the substrate surface. If sand blasting is applied to this, since the side wall surface of the remaining thermosetting portion (partition) is formed perpendicular to the substrate surface, a partition having a smaller width and pitch can be formed. In addition, it can be easily formed with a smaller number of processing steps than a conventional processing step using a photolithography technique having many steps. The shape of the partition walls is not limited to a band shape, but may be a mesh shape for dividing discharge cells one by one. As described above, according to the present invention,
Because partition walls with smaller width and pitch can be easily formed,
This provides an extremely useful effect in industry, such as providing a display panel that can realize a finer image at a lower cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing a step of forming a partition according to an embodiment of the present invention in the order of steps. FIG. 2 is a side sectional view showing a step of forming a partition according to a conventional technique in the order of steps. 2 (c) is a side cross-sectional view of the case where the sandblasting process has been sufficiently performed. [FIG. 4] A perspective view of a main part for explaining a partition of a display panel. [Description of symbols] 1, 2: substrate 2b: partition (rib) 11: insulating layer 11-1: thermosetting portion 11-2: uncured portion 12: laser beam

Claims (1)

(57) In a method for forming a partition on a substrate constituting a display panel, a step of forming an insulating layer made of a thermosetting insulating material for forming a partition on the substrate. Irradiating the surface of the insulating layer with a laser beam, and thermally curing only the portions to be the partition walls to pattern the partition walls; and performing a sandblast treatment on the patterned insulating layer to remove uncured portions. Forming a partition in the remaining thermosetting portion.