JP2000085847A - Method for packing display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unevenness in display due to vibration at the time of transporting a display panel by packing with a rigid plate-like body in tight contact with a surface of the display panel via a protection sheet. SOLUTION: A display panel 10 is received in a packaging box 11, and a lid is put over for carrying at the time of carrying the display panel 10. The packaging box 11 comprises a flat packaging box which is one size larger than the display panel 10. At the time of transporting the display panel 10, a vinyl chloride panel 16 is brought into tight contact with a panel surface of the display panel 10 via a protection sheet 15, and cushions 17, 18 made of sponge are placed on both sides of the display panel 10 and the vinyl chloride panel 16. An assembly of the display panel 10 and the vinyl chloride panel 16 is protected by the upper and lower cushions 17, 18 and put in the packaging box 11. Thus a natural frequency of the display panel is increased to be higher than that of vibration during transportation, thereby reliably preventing display defects due to the vibration or damage to guarantee quality for transportation of the display panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for packing a display panel, and more particularly to a method for packing a display panel used as a display.

[0002]

2. Description of the Related Art Liquid crystal display panels, plasma display panels,
Display panels used as various displays such as plasma-addressed liquid crystal display panels have been proposed or used. A display panel used as such a display constitutes, for example, a display of a wall-mounted television.

[0003] Such a panel is constituted by a display panel which is considerably larger than a conventional liquid crystal display panel.
A display panel of about 25 inches to 40 inches is used. Such a display panel is transported or transported and supplied to an assembly line. Especially when the factory where the display panel is manufactured is separated from the assembly line where the wall-mounted TV is assembled,
The display panel is supplied to the assembly line by a method such as trucking.

[0004]

When the display panel used as such a display is transported, the panel is subjected to vibration. In particular, when transporting at low temperatures, display unevenness tends to occur. This poses a major problem, especially during winter transport when temperatures drop. This poses a problem that the quality of the display panel cannot be assured at the time of transport between the display panel manufacturing department such as a liquid crystal panel and the wall-mounted TV assembling department.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of packing a display panel in which display unevenness is not caused by vibration when the display panel is transported. I do.

[0006]

According to the present invention, in a method of packing a display panel used as a display, a rigid plate-like body is brought into close contact with a surface of the display panel via a protective sheet and packed. The present invention relates to a method for packing a display panel.

Here, a buffer may be provided on both sides of the display panel and the plate-like member which are in close contact with each other via the protective sheet. Further, buffers may be arranged on both sides of the display panel and the plate-like body which are in close contact with each other via the protective sheet, and may be stored in the packaging box. The rigid plate-shaped member may set the natural frequency of the display panel higher than the frequency of the vibration during transportation. Alternatively, the natural frequency of the display panel may be set to 150 Hz or more by the rigid plate.

In a preferred aspect of the present invention, when a display panel composed of a large flat panel is packed, a rigid plate-like body is brought into close contact with the panel surface of the display panel via a protective sheet, and the display panel in the packed state is mounted. The vibration of the panel surface is suppressed, or the natural frequency of the display panel is preferably set to 150 Hz or more, which is higher than the vibration frequency of 20 to 100 Hz at the time of transportation, thereby causing display defects due to resonance. And to prevent breakage. Therefore, breakage and defects of the display panel which occur during transportation of the display panel including the large flat panel can be prevented.

[0009]

1 to 3 show a method of packing a display panel according to an embodiment of the present invention. In this embodiment, the method is applied to packing of a display panel 10 comprising a plasma addressed liquid crystal display panel. It was done. As shown in FIGS. 1 and 2, the display panel 10 is housed in a packaging box 11 at the time of transportation, and is transported with a lid 13 covered. Here, the packaging box 11 is composed of a flat packaging box such as a corrugated cardboard case, and has a size slightly larger than the size of the display panel 10.

In particular, when such a display panel 10 is transported, in order to prevent the occurrence of display defects, a 10-mm-thick chloride sheet is provided on the panel surface of the display panel 10 via a 1-mm-thick protective sheet 15. The vinyl panel 16 is brought into close contact, and buffers 17 and 18 made of sponge are arranged on both sides of the display panel 10 and the vinyl chloride panel 16, respectively. That is, the combination of the display panel 10 and the vinyl chloride panel 16 is used to form upper and lower buffers 17 and 18.
Thus, it is stored in the packaging box 11 in such a state.

FIG. 4 shows a display panel 10 transported by such a packing. The display panel 10 has a glass substrate 22 and an anode 24 between partition walls 23 formed on the glass substrate 22. And the cathode 25 are formed by strips.
The dielectric sheet 26 is arranged on the front side of the partition 23.

A liquid crystal layer 27 is provided on the front side of the dielectric sheet 26.
And a column electrode 28 made of a transparent electrode is provided on the surface of the liquid crystal layer 27. A color filter 29 is bonded on the column electrode 28, and a polarizing plate 30 is bonded on the color filter 29.

A backlight 33 is provided on the back side of the glass substrate 22, and a polarizing plate 34 is provided on the front side of the backlight 33 and on the back side of the glass substrate 22. .

A liquid crystal layer 27 is formed between the dielectric sheet 26 and the column electrode 28, as shown in FIG.
In order to form such a liquid crystal layer 27 as shown in FIG.
A spherical space 38 is provided between the dielectric sheet 26 and the column electrode 28. By such a spherical spacer 38, a liquid crystal gap length is set between the dielectric sheet 26 and the column electrode 28.

In the case of the plasma addressed liquid crystal display panel 10 as shown in FIGS. 4 and 5, display irregularities as shown in FIG. 6 occur during transportation. This display unevenness is a gray display state, and is a ring-shaped shading unevenness. This is not a transmitted light unevenness due to spots or the like, but rather a shading unevenness caused by a thickness unevenness of the liquid crystal layer, which is called a liquid crystal gap unevenness.

In order to investigate the cause of the liquid crystal gap unevenness, display unevenness as shown in FIG. 6 after the vibration test was observed with a scanning electron microscope (SEM). As a result, a large number of deformations which seemed to be pushed by the spherical spacers 38 on the color filter 29 side were observed. An example is shown in FIG. Although the liquid crystal gap length shown in FIG. 5 is maintained at a constant value by the spherical spacer 38 in the liquid crystal layer 27, the liquid crystal gap length is narrower in the portion where the color filter 29 is deformed than in the normal portion, and the liquid crystal gap unevenness is reduced. Is considered to have occurred.

By protecting the plasma-addressed liquid crystal display panel 10 with a cushion made of sponge, partial application of a load can be prevented. That is, by protecting with the buffer, a partial load is not applied. Also, it has been confirmed that even when an unbalanced load is applied to the display panel 10, such liquid crystal gap unevenness does not occur.

Next, the natural frequency of the panel 10 was investigated as a cause of the pressure distribution in the liquid crystal layer 27 in the panel 10. As a result, the natural frequency of the 25-inch type plasma addressed liquid crystal display panel is 48 Hz, 108 H
z and 123 Hz. It has been found that the natural frequency tends to decrease as the size of the panel 10 increases, and as a result, the natural frequency also decreases to the frequency range of the vibration generated during transportation. 8 and 9 show 48.751 Hz and 1
An example of vibration analysis at 08.839 Hz is shown. The CF deformation caused by the spherical spacer 38, which is considered to be the cause of the liquid crystal gap unevenness, is considered to be caused by vibration during transportation. Was taken.

That is, as described above, when packing the display panel 10, the vinyl chloride sheet 16 having a thickness of 10 mm is pressed against the display surface side of the panel 10 via the protection sheet 15 having a thickness of 1 mm, and Sponge buffer 17, 1
8, housed in a box 11 and provided with a lid 12.

In the transport test, the vibration test, and the low-temperature vibration test, the effect of suppressing the gap unevenness was confirmed. The protective sheet 15 is a display panel 10 made of a vinyl chloride plate 16.
In order to prevent the display surface from being damaged and to prevent electrostatic destruction of the driving IC mounted on the panel 10, a sheet made of a conductive material, for example, trade name Mirror Mat, A #
110 pink JSP was used.

It is necessary to optimize the thickness of the protective sheet 15 and the material and shape of the plate-like body 16 for pressing the panel surface of the display panel 10 depending on the structure of the panel 10 and the like. Here, the optimization is performed by the vibration test. However, the optimization is performed by measuring the natural frequency of the display panel 10 in a packaged state, by a vibration analysis simulation, or the like.

The above-described embodiment is applicable to a plasma-addressed liquid crystal display panel of 25 inches. For example, a large-sized display panel of 40 inches or more is used as described above even in the case of transportation in a set state. Measures may be taken effectively. Such a packing method is also extremely effective as a measure against damage caused by vibration of a display panel composed of a large flat panel such as a plasma display panel or an FED panel. That is, it is possible to more effectively prevent damage and defects due to vibration in such a large-sized display panel device.

[0023]

As described above, the present invention relates to a method for packing a display panel used as a display, in which a rigid plate-like body is closely adhered to the surface of the display panel via a protective sheet and packed. It is.

Therefore, by increasing the natural frequency of the display panel by a rigid plate-like member that is in close contact with the surface of the display panel via the protective sheet, and particularly by making it higher than that at the time of transportation, vibration can be reduced. This makes it possible to more reliably prevent the occurrence and breakage of display defects, thereby ensuring the quality assurance associated with the transportation of the display panel.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a method of packing a display panel.

FIG. 2 is a vertical sectional view of the package.

FIG. 3 is an enlarged vertical sectional view of the main part.

FIG. 4 is an exploded perspective view showing the structure of the display panel.

FIG. 5 is an enlarged vertical sectional view of the main part.

FIG. 6 is an enlarged front view showing a display defect appearing on a display panel.

FIG. 7 is an enlarged front view of a main part of a display unevenness portion.

FIG. 8 is a graph showing the results of a vibration analysis test at 48.751 Hz.

FIG. 9 is a graph of a result of a vibration analysis test at 108.839 Hz.

[Explanation of symbols]

10 ‥‥ display panel, 11 ‥‥ packaging box, 12 ‥‥ lid, 1
5 ‥‥ protection sheet, 16 ‥‥ vinyl chloride panel, 17,
18 ‥‥ buffer, 22 ‥‥ glass substrate, 23 ‥‥ partition,
24 ‥‥ anode, 25 ‥‥ cathode, 26 ‥‥ dielectric sheet, 27 ‥‥ liquid crystal layer, 28 ‥‥ column electrode (transparent electrode), 29 ‥‥ color filter, 30 ‥‥ polarizing plate, 33
{Backlight, 34} Polarizer

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yuichi Oyama 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Koichi Yamamoto 6-35 35 Kita Shinagawa, Shinagawa-ku, Tokyo Sony F term in reference (reference) 3E066 AA03 AA12 CA01 DA01 HA01 JA04 NA01 3E096 AA01 BA20 BB03 CA02 FA01 GA11

Claims (5)

[Claims] 1. A method for packing a display panel used as a display, wherein a rigid plate-like body is closely attached to a surface of the display panel via a protective sheet and packed. Packing method. 2. The method of packing a display panel according to claim 1, wherein buffers are arranged on both sides of the display panel and the plate-like body which are in close contact with each other via a protective sheet. 3. The display panel according to claim 2, wherein a buffer is disposed on both sides of the display panel and the plate which are in close contact with each other via a protection sheet, and the display panel is housed in a packaging box. Packing method. 4. The display panel packing method according to claim 1, wherein the rigid plate-like body makes the natural frequency of the display panel higher than the frequency of vibration during transportation. 5. The method of packing a display panel according to claim 1, wherein the natural frequency of the display panel is set to 150 Hz or more by the rigid plate.