JP2006120389A - Display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid breakage or crack of a glass plate at a heating process or positioning by forming corner parts of a glass substrate for a display panel into a shape of adjacent circular arcs or a shape of a straight line and a circular arc. <P>SOLUTION: Corner parts of two sheets of rectangular glass substrates of the display panel in plane view are formed into such a shape composed of a reversed circular arc-shaped part for chamfering where a corner part at crossing of the first side and the second side crosses is cut off in a shape of a circular arc having its center outside the glass substrate; a first circular arc part circumscribing the reversed circular arc-shaped part and inscribing the first side; and a second circular arc part circumscribing the reversed circular arc-shaped part and inscribing the second side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display panel, and more particularly to a glass substrate used for a large-screen display panel such as a plasma display panel (PDP).

  6 (a) and 6 (b) are explanatory views showing the shape of a glass substrate used in a conventional display panel. 6A is an overall view, and FIG. 6B is an enlarged view of a corner portion C in FIG. 6A.

  In the glass substrate 11 used in the conventional display panel, the corner portion has a chamfered shape L which is processed into a straight line at an angle of approximately 45 degrees with respect to the first side J and the second side K.

Japanese Patent No. 3412548

  In the display panel manufacturing process, a heating process is widely used. Therefore, there is a problem that the glass substrate is easily broken by thermal stress.

  Moreover, in the manufacturing process of the display panel, positioning by abutting at the edge or corner of the glass substrate is generally used, but due to the mechanical force applied to that, the edge or corner of the glass substrate is used. Chipping and cracking become a problem.

  Therefore, although it has been proposed that the corner portion of the glass substrate is rounded (see Patent Document 1), rounding of the corner portion causes an increase in equipment cost.

  The present invention has been made in consideration of such circumstances. By forming the corner portion of the glass substrate with an arc and an arc, or a straight line and an arc, the glass substrate is not cracked or chipped during the heating process or positioning. It avoids cheaply.

  The present invention is a display panel in which two rectangular glass substrates are bonded to each other, and a corner portion of the two rectangular glass substrates has a first side and a second side when the glass substrate is viewed in a plan view. A chamfered reverse arc part cut off by an arc centered on the outside of the glass substrate, and a first arc part circumscribing the reverse arc part and inscribed in the first side, A display panel having a shape formed by a second arc portion circumscribing the reverse arc portion and inscribed by a second side.

  According to the present invention, a glass substrate excellent in thermal shock resistance and mechanical strength can be obtained, chipping and cracking of the glass substrate can be avoided, and the yield in the manufacturing process of the display panel can be improved. .

  In the present invention, as the two rectangular glass substrates, substrates using various glass materials known in the art can be applied. Examples of the glass substrate include a substrate in which desired components such as an electrode, an insulating film, a dielectric layer, and a protective film are formed on the substrate.

  As bonding of the two rectangular glass substrates, various sealing methods known in the art can be applied.

  The present invention is also a display panel in which two rectangular glass substrates are bonded to each other, and a corner portion of the two rectangular glass substrates has a first side when the glass substrate is viewed in plan view. A straight portion for chamfering with a corner portion intersecting with the second side obliquely cut off, a straight portion for chamfering, a first arc portion inscribed in the first side, the straight portion for chamfering, and the first portion A display panel having a shape formed by a second arc portion inscribed in the two sides.

  In the above configuration, it is desirable that the chamfering straight line portion has an angle of 45 degrees with respect to the first side and the second side, respectively.

  Moreover, it is desirable that the two glass substrates are rounded at the corners of the end surfaces when the glass substrate is viewed in cross section.

  Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. In addition, this invention is not limited by this, A various deformation | transformation is possible.

  FIG. 1A and FIG. 1B are explanatory views showing the shape of the glass substrate of the display panel of the present invention. FIG. 1A is an overall view, and FIG. 1B is an enlarged view of a corner portion D in FIG.

  In the glass substrate 11 of this embodiment, in order to avoid cracking or chipping of the glass substrate during the heating process or positioning during display panel manufacture, the corner portion of the glass substrate 11 has an inverted round shape with the center outside the panel. It is formed by a chamfered portion and two arc portions connected to the inverted rounded chamfered portion, and the edge of the end surface is rounded.

  Specifically, this shape is such that the corner portion of the two rectangular glass substrates 11 and the corner portion where the first side J and the second side K intersect when the glass substrate 11 is viewed in plan view are the glass substrate. A chamfered reverse arc portion E cut off by an arc centered on the outside, a first arc portion R1 circumscribing the reverse arc portion E and inscribed in the first side J, and circumscribing the reverse arc portion F In addition, the shape is formed by the second arc portion R2 inscribed in the second side K.

FIG. 3 is an explanatory view showing a processed state of the reverse arc of the corner portion, and FIG. 4 is an explanatory view showing a state of the rounded processing of the corner portion.
As a processing order of the corner portion, a reverse round process is performed on the corner portion of the glass substrate 11 using a cylindrical polishing grindstone G that rotates in the direction of arrow F so that the center is outside the glass substrate ( (See FIG. 3).

  Next, the corner portion is rounded. In this rounding process, a cylindrical grindstone H is used, and the grindstone H is rotated so that the corner portion is moved in the direction of the arrow M in the figure to perform polishing, and the first arc portion and the second arc portion. (See FIG. 4). Thus, the polishing of the corner portion is performed in two steps by sharply cutting and slightly reducing the corner.

  In the implementation, the reverse arc portion E having the center outside the substrate was set to R100 (mm), and the first and second arc portions R1 and R2 having the center inside the substrate were polished at R3 (mm).

  5 (a) and 5 (b) are explanatory views showing the overall shape of the glass substrate of the display panel of the present invention. FIG. 5A is a plan view, and FIG. 5B is an explanatory view showing a II cross section of FIG. 5A.

  The two glass substrates used in the display panel of the present invention are rounded so that the corners (end face edges) of the end face have a round shape N when the glass substrate is viewed in cross section. In the implementation, the edge chamfering of the edge portion was performed at R0.6 (mm).

  A plasma display panel was produced using the glass substrate thus obtained.

  In a glass substrate having a chamfered shape in which the corner portion is linearly processed at an angle of about 45 degrees, the substrate cracking occurred in the firing process, whereas the above-described corner portion is subjected to reverse rounding and the edge of the end surface is rounded. In the case of using a processed glass substrate, substrate cracking in the firing process did not occur.

  FIG. 2A and FIG. 2B are explanatory views showing other shapes of the glass substrate of the display panel of the present invention. FIG. 2A is an overall view, and FIG. 2B is an enlarged view of a corner portion D in FIG.

  In the glass substrate 11 of the present embodiment, the corner portion of the glass substrate is chamfered at an angle of about 45 degrees in order to avoid the cracking or chipping of the glass substrate during the heating process or positioning during display panel manufacture. A straight line part and two circular arc parts connected to the straight line part for chamfering are formed, and the edge of the end face is rounded.

  Specifically, this shape is such that the corner portion of the two rectangular glass substrates 11 and the corner portion where the first side J and the second side K intersect with each other when the glass substrate 11 is viewed in plan are 45 degrees oblique. Chamfered straight portion P, chamfered straight portion P and first arc portion R1 inscribed in first side J, chamfered straight portion P and second side K. The shape is formed by the second arcuate portion R2 in contact therewith.

  As a processing order of the corner portion, a chamfering straight portion P is formed by chamfering the corner portion of the glass substrate 11 at an angle of approximately 45 degrees, and then the chamfering straight portion P is connected to the corner portion of the glass substrate 11. The round process was performed so that 1 and 2nd circular arc part R1, R2 may be formed.

  In the implementation, the straight portion for chamfering was polished with C3, and the corner portions of the first and second arc portions R1 and R2 were polished with R3 (mm).

  A plasma display panel was produced using the glass substrate thus obtained.

  In the glass substrate in which the corner portion is simply processed into a straight line at an angle of approximately 45 degrees, the substrate cracking occurred in the firing process, whereas the corner portion described above is subjected to the chamfering linear processing and the rounded processing, and the end surface. In the case of using a glass substrate having an edge processed at the edge, no substrate cracking was observed in the firing step.

  Thus, after chamfering the corner of the glass substrate, rounding was performed, and no cracks were observed in the firing process even in the substrate having a corner shape formed of a straight line and two arcs.

  When complete rounding is performed on the corner portion, the amount of polishing of the glass is large, and the consumption of the grindstone becomes severe. However, as described above, if a reverse round process is applied to the corner portion of the glass substrate, a glass substrate excellent in thermal shock resistance and mechanical strength can be obtained, thereby avoiding chipping and cracking of the glass substrate. The yield in the process can be improved. In addition, the tact is fast because it is first shaved with a large grindstone.

  Since the chamfering of the reverse arc portion having the center outside the substrate can be polished while rotating a cylindrical and large-diameter grindstone, compared with the case where the corner portion is rounded, a small-diameter grindstone is used. Less polishing is required and indirect material costs are reduced. Moreover, since the replacement period of consumables can be lengthened, the equipment operation rate is improved and the cost is reduced.

It is explanatory drawing which shows the shape of the glass substrate of this invention. It is explanatory drawing which shows the other shape of the glass substrate of this invention. It is explanatory drawing which shows the process state of the reverse arc of a corner part. It is explanatory drawing which shows the state of the round process of a corner part. It is explanatory drawing which shows the whole shape of the glass substrate of this invention. It is explanatory drawing which shows the shape of the conventional glass substrate.

Explanation of symbols

  11 Glass substrate

Claims (4)

A display panel formed by bonding two rectangular glass substrates,
The corner portion of the two rectangular glass substrates is chamfered when the glass substrate is viewed in plan, and the corner portion where the first side and the second side intersect is cut off by an arc centered on the outside of the glass substrate. A reverse arc portion, a first arc portion circumscribing the reverse arc portion and inscribed in the first side, and a second arc portion circumscribing the reverse arc portion and inscribed in the second side A display panel having a formed shape. A display panel formed by bonding two rectangular glass substrates,
A corner portion of the two rectangular glass substrates is a straight portion for chamfering in which a corner portion where the first side and the second side intersect is obliquely cut off when the glass substrate is viewed in plan, and the chamfering thereof And a first arc portion inscribed in the first side, and a shape formed by the chamfering linear portion and the second arc portion inscribed in the second side. Display panel.   The display panel according to claim 1, wherein the chamfered straight line portion has an angle of 45 degrees with respect to the first side and the second side.   The display panel according to any one of claims 1 to 3, wherein the two glass substrates are rounded at corners of end surfaces when the glass substrates are viewed in cross section.

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