JP2005043700A - Display panel bonding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently cure a sealant in a portion which is a shadow of a light-shielding portion on the entire periphery of an image without one movement of a light irradiation portion or a work stage.
A light irradiating unit 1 having a plurality of rod-shaped lamps 1a for emitting ultraviolet rays is provided, and an ultraviolet curable sealant 17 and a liquid crystal 19 are sandwiched between two light-transmitting substrates to form an integrated liquid crystal panel. 10 is irradiated with ultraviolet rays from the side of the substrate on which a light shielding portion such as a black matrix is formed. A mask 3 having a light transmitting part and a light shielding part is disposed between the light irradiation part 1 and the display panel material, and a mirror 5 is provided on the mask 3. The mirror 5 is attached to the light shielding portion 3b of the mask 3, and the light reflected by the mirror 5 enters the substrate from an oblique direction via the light transmitting portion 3a of the mask 3. The liquid crystal panel 10 is placed on the work stage 2 at a predetermined interval, and the surface of the work stage 2 is used as a light reflecting member to reflect the light transmitted through the liquid crystal panel 10.
[Selection] Figure 1

Description

  The present invention relates to a display panel laminating apparatus for laminating two light-transmitting substrates with a photocurable sealing agent in an assembly process of a display panel such as a liquid crystal panel.

The liquid crystal screen includes a liquid crystal panel, a driver that controls the liquid crystal panel, a backlight that illuminates the liquid crystal panel from the back surface, and the like. The liquid crystal panel encloses liquid crystal and controls the voltage applied to the liquid crystal panel to transmit or block light from the backlight to display a screen.
FIG. 13 is a diagram illustrating an example of the above-described liquid crystal panel (color liquid crystal panel). 11 is a color filter substrate, 12 is a TFT substrate, 13 is a TFT element (thin film transistor), 14 is a wiring portion, 15 is a black matrix, 16 is an alignment film, 17 is a sealant, 18 is an electrode, and 19 is a liquid crystal. In the figure, the vertical direction is extremely enlarged compared to the horizontal direction for easy understanding.
As shown in the figure, the liquid crystal panel is usually composed of two light-transmitting substrates (hereinafter described as a glass substrate, but may be a transparent resin substrate) composed of a color filter substrate 11 and a TFT substrate 12. Has been.
The color filter substrate 11 is formed with a light shielding film 15 (hereinafter abbreviated as BM) called a black matrix, a color filter, and the like. The TFT substrate 12 has a driving element for driving a liquid crystal, such as a TFT element 13, A liquid crystal drive electrode formed of a transparent conductive film and a wiring portion 14 connecting them are formed. In the liquid crystal panel, the image viewing side (front side) is the color filter substrate 11 (hereinafter also referred to as the upper glass substrate or simply the glass substrate), and the opposite side (back side) is the TFT substrate 12 (hereinafter referred to as the lower glass substrate or simply the glass substrate). Also called a substrate).
The BM 15 is formed of, for example, a chromium vapor deposition film or a black resin, and light from the backlight leaks from a portion not related to image display (a portion other than the liquid crystal), for example, the TFT element 13 or the wiring portion 14. It plays the role of blindfold so as not to disturb the image.

In the manufacturing process of the liquid crystal panel as described above, a manufacturing method called a drop method (One Drop Fill, abbreviated as ODF) has come to be adopted. The dropping method is described in Patent Document 1, for example.
The dripping method will be briefly described below.
(A) Two glass substrates are formed separately. That is, a TFT element and a liquid crystal drive electrode are formed on one substrate, and a BM and a color filter are formed on the other substrate.
(B) On one glass substrate, a plurality of enclosures (sections) are formed using a sealing agent that is an ultraviolet curable resin. It is dropped into the enclosure formed by the liquid crystal and accumulates in it. The width of the sealing agent is about 1 to 1.5 mm.
(C) The other glass substrate is placed thereon, and the sealing agent is irradiated with ultraviolet rays through the glass substrate to cure the two substrates. The sealing agent serves as both sealing of the liquid crystal and adhesion of the two substrates.
(D) After bonding, the substrate is divided (cut) for each outline and incorporated into a personal computer or television as a display screen.

In the above process, in order to cure the sealing agent, when irradiating the liquid crystal panel with ultraviolet rays, it is required to prevent the ultraviolet rays from being irradiated to the part other than the sealing agent, for example, the liquid crystal part and the TFT element as much as possible. ing. This is because when the liquid crystal or the TFT element is irradiated with strong ultraviolet light that cures the sealing agent, an undesired characteristic change occurs. In order to prevent this, a light shielding mask (hereinafter referred to as a mask) is provided between the light irradiation unit and the liquid crystal panel.
FIG. 14 shows an example of the mask. The mask 3 includes a light transmitting part 3a and a light shielding part 3b. The position corresponding to the sealant is a light transmitting part 3a so that ultraviolet rays can be transmitted. The liquid crystal and TFT element portions are shielded by the light shielding part 3b. Yes. Such a mask is usually made by patterning chromium on a quartz plate.
FIG. 15 shows a bonded liquid crystal panel. The liquid crystal panel formed by sandwiching the sealant 17 between the two glass substrates 11 and 12 has a plurality of (four in the same figure) contours. Then, a sealing agent 17 is applied so as to surround each contour, and a BM 15 is formed so as to cover the sealing agent 17. In the figure, only BM15 formed on the sealant is shown to avoid complication.

As shown in FIG. 16, the sealant 17 may have a portion under the BM 15. When the sealant 17 is irradiated with ultraviolet rays, irradiation is desired from the color filter side on which the BM15 is formed. There is a user to do.
The reason is that even if there is light that travels around the light shielding portion of the mask during irradiation, the BM 15 can prevent the liquid crystal portion from being irradiated with ultraviolet rays, as shown in FIG.
However, if the light is irradiated from the side where the BM 15 is formed, the sealant 17 under the BM 15 cannot be cured.
As a countermeasure against this, as shown in FIGS. 18A and 18B, the light irradiation unit 1 is disposed obliquely with respect to the liquid crystal panel 10, and light is irradiated obliquely to a portion below the light shielding unit such as the BM15. In the past, several such devices have been proposed.
For example, Patent Document 2 describes an apparatus that irradiates light obliquely to substrates to be bonded. Note that this apparatus is characterized in that irradiation is performed from the lower glass substrate 12 side, that is, the substrate side opposite to the BM 15, and irradiation is not performed from the BM 15 side.
Further, Patent Document 3 discloses that light transmitted through a substrate to be bonded is reflected and diffused on the surface of a work stage on which the substrate is placed, and the diffused light is incident on the substrate obliquely. An apparatus for curing by irradiation is described.
Further, Patent Document 4 describes an apparatus in which ultraviolet rays are irradiated onto a substrate through a diffusion plate, the diffused light is incident obliquely on the substrate, and is irradiated with a sealant in a shadow portion to be cured. Has been.
JP 09-073096 A Patent No. 3065011 Patent No. 28828403 Japanese Patent No. 29987295

As described above, various devices have been conventionally proposed. However, these devices have the following problems.
Since the thing of the said patent document 2 can only irradiate to one direction by one irradiation, in order to harden a sealing agent over the perimeter of an outline, it shows to the said FIG. 18 (a) (b). Thus, it is necessary to perform irradiation from at least two directions, and the processing time becomes long.
In addition, the light irradiation unit or the substrate must be moved, and a moving mechanism for that purpose is required, resulting in a complicated and large device structure.
In the devices described in Patent Documents 3 and 4, the light component obliquely incident on the seal portion under the light shielding portion is a part of the light diffused by the diffusion plate or the light reflected from the work stage surface. It is a part. For this reason, the irradiation intensity tends to be insufficient to cure the sealant. As shown in FIG. 16, the sealing agent 17 under the light-shielding portion has a width of about 500 μm to 1 mm with respect to the interval of about 5 μm between the two glass substrates. Since only a part of the light is incident, the irradiation intensity is originally weak. For this reason, as shown in FIG. 19, when reflection is repeated between the work stage 2, the light intensity is further weakened, and the sealing agent may not be sufficiently cured.
The present invention has been made in view of the above-described problems of the prior art, and in a light irradiation device for bonding liquid crystal panels, a seal for a portion that has a light component with a strong oblique incidence and is a shadow of a light shielding portion. The agent can be fully cured, and the sealant in the shadow area can be cured over the entire circumference of the contour by one irradiation. Furthermore, the light irradiation unit and the work stage moving mechanism are not required. It aims at miniaturization and simplification.

In the present invention, the above-mentioned problems are solved as follows.
A light irradiating unit having a plurality of rod-shaped lamps that emit ultraviolet rays is provided, and a light-shielding portion such as a black matrix is formed on at least one of the two light-transmitting substrates, and ultraviolet light is interposed between the two light-transmitting substrates. Ultraviolet rays are irradiated from the side of the substrate on which the light-shielding portion is formed, to the display panel material that is integrally formed by sandwiching the curable sealant and the liquid crystal. The light irradiating portion is disposed to face the substrate so that the incident light component orthogonal to the surface of the substrate is mainly used. Further, a mask having a light transmitting part and a light shielding part is arranged between the light irradiation part and the display panel material, and the light from the light irradiation part is reflected on the mask so as to be incident obliquely on the substrate. A reflective member is provided. The reflecting member is attached to the light shielding portion of the mask, and the light reflected by the reflecting member enters the substrate from an oblique direction through the light transmitting portion of the light shielding mask.
Furthermore, the surface of the work stage on which the display panel material is placed is used as a light reflecting member, and the display panel material is placed on the work stage at a predetermined interval.
A component of light incident on the light transmitting part of the mask from above (at an incident angle close to 0 °) is directly incident on the substrate through the light transmitting part of the mask, and seals a part that is not shielded by the light shielding part. Used for curing agents.
Further, the light reflected by the reflecting member provided on the mask is incident on the substrate from an oblique direction, and is used for curing the sealant in a portion that is shaded by the light shielding portion of the substrate. This light is originally irradiated to the light shielding part of the mask and is not used for curing the sealant. The light is reflected by the reflecting member and used for curing the sealant in the shadow portion. Therefore, it is possible to irradiate the sealant in the shadow portion with strong light using the light that has been thrown away.
Further, the light incident on the substrate obliquely and transmitted through the display panel material is reflected by the surface of the work stage, is incident on the substrate again, and is used for curing the sealant in the shadow portion.

As described above, the following effects can be obtained in the present invention.
(1) A mirror is provided on the mask, the light that has been irradiated to the light shielding part of the conventional mask is reflected, and the sealant in the shadow of the light shielding part such as a black matrix provided on the substrate is irradiated obliquely. Therefore, it is possible to irradiate relatively strong light to the sealant in the shadow of the light-shielding part provided on the substrate by effectively using the light that has been wasted conventionally, It can be cured.
(2) A mirror provided on the mask is provided over the entire circumference of the light-shielding part of the mask so that oblique light can be applied to all sealing agents on the substrate. The sealant in the shadow area can be cured.
(3) No light irradiation unit or work stage moving mechanism is required, and the apparatus can be reduced in size and simplified.

Hereinafter, modes for carrying out the present invention will be described.
In the following, a liquid crystal panel will be described as an example. However, in the present invention, a display panel other than the liquid crystal panel, for example, if the sealant (adhesive) hidden in the light shielding portion such as a black matrix is cured, for example, The present invention can be similarly applied to a plasma display panel (PDP). Further, although the light transmissive substrate will be described by taking a glass substrate as an example, even a transparent resin substrate can be applied as long as light having a wavelength for curing the sealant is transmitted. FIG. 1 is a diagram showing a schematic configuration of a display panel bonding apparatus according to an embodiment of the present invention. This figure is a cross-sectional view in a direction perpendicular to the longitudinal direction of the rod-shaped lamp provided in the light irradiation section.
As shown in the figure, a liquid crystal 19 is sealed in an enclosure of a sealant 17 in a liquid crystal panel 10 (hereinafter also referred to as a workpiece 10) to be bonded. Although not shown, there are light shielding portions such as BM and wiring as described above, and the sealant 17 is also applied to the shadowed portions of these light shielding portions.
The workpiece 10 is placed on the workpiece stage 2 via a spacer 2a. The spacer 2a is for providing a predetermined interval between the surface of the work stage 2 and the liquid crystal panel 10, and the provision of this interval will be described later.
The surface of the work stage 2 is made of solid aluminum (reflectance of ultraviolet rays of about 70%) or bright aluminum (also reflectance of about 85%) so as to reflect ultraviolet rays well.

The light irradiation unit 1 includes a plurality of rod-shaped lamps 1a (for example, a high-pressure mercury lamp and a metal halide lamp) that emit ultraviolet rays, and the emitted light is emitted from directly above the workpiece 10 (at an incident angle of 0 °). It is provided so as to face the work stage 2 so as to be irradiated.
The bar-shaped lamps 1a have a length corresponding to the length of the workpiece 10 so that the entire surface of the liquid crystal panel can be irradiated in a lump. The number of the rod-shaped lamps 1a having this length corresponding to the width of the workpiece 10 is increased. Line up.
Between the light irradiation unit 1 and the liquid crystal panel 10 placed on the work stage 2, a mask 3 having a light shielding unit is provided so that ultraviolet rays are not irradiated to an undesired portion of the liquid crystal panel. The mask 3 is held by the mask stage 4. A mirror 5 that reflects light from the light irradiation unit 1 obliquely toward the liquid crystal panel 10 is attached to the mask 3.

As shown in FIG. 2, the light from the light irradiation unit 1 is irradiated to the mask 3. The light irradiated to the light transmitting portion 3a of the mask 3 passes through the mask 3 as it is, enters the liquid crystal panel 10 at an angle close to 0 °, and is not a shadow of the light shielding portion 3b. Is cured.
On the other hand, the light applied to the mirror 5 attached to the mask 3 is reflected toward the liquid crystal panel 10 and passes through the light transmitting portion 3a. Part of the light that has passed through the translucent part 3 a is incident on the sealing agent 17 at an angle. Further, another part of the light passes through a portion of the liquid crystal panel 10 where the liquid crystal is not present, is reflected by the surface of the work stage 2, and the reflected light is incident on the sealing agent 17 obliquely from below.
Actually, light is refracted when it enters the glass substrates 11 and 12 and when it exits from the glass substrates 11 and 12, but it is omitted in this figure for the sake of easy understanding.
Light incident from above and below obliquely travels inside the sealant 17 while being repeatedly reflected between the BM 15 and the glass substrate 11 or 12 or between the BM 15 and the work stage 2, and only irradiated from directly above (incident angle 0 °). The part of the sealant that cannot be cured is cured.
The mirror 5 provided in the mask 3 is provided in a light shielding portion facing the seal portion so that all the sealing agents 17 of the liquid crystal panel 10 can be irradiated with oblique light.

FIG. 3 shows a schematic perspective view of the mask 3. The material of the mirror 5 is solid aluminum or bright aluminum like the work stage 2.
The figure shows a mask of a liquid crystal panel having a four-sided outline. Light is incident obliquely on the sealant in the peripheral portion of the liquid crystal panel 10 on the outer peripheral portion of the light transmitting portion 3a in the peripheral portion of the mask 3. As shown in FIG. 2, light is obliquely applied to the sealant 17 in the adjacent image area at each edge portion of each light shielding portion 3b other than the peripheral portion of the mask 3. A mirror 5b tilted so as to be incident is disposed opposite to the mirror 5b.
Similarly, when the number of contours is larger than four, similarly, a mirror tilted so that light is incident obliquely on the sealant in the peripheral portion of the liquid crystal panel 10 on the outer peripheral portion of the transparent portion 3a in the peripheral portion of the mask 3 Are disposed at each edge portion of each light shielding portion 3b other than the peripheral portion, and a mirror tilted so that light is incident obliquely on the sealant 17 of the adjacent image.
The distance between the contours (sealant) formed on the liquid crystal panel 10, the angle of light incident on the liquid crystal panel 10, the angle of the mirror 5 attached to the mask 3, and the distance provided between the work stage 2 and the liquid crystal panel 10 are Are related to each other, and are appropriately set to appropriate values.

The above values can be determined as follows.
As described above, the mirror 4 is provided on the light shielding portion of the mask 3. Therefore, as shown in FIG. 4A, when the interval between the contours (interval of the sealant 17) L is large, the angle θ of the mirror 5 is increased so that the reflected light reaches far.
On the other hand, as shown in FIG. 4B, if the interval L is narrow, the angle θ of the mirror 5 is reduced. In the figure, the mask for attaching the mirror is omitted.
FIG. 5 shows an example of a contour actually produced on a glass substrate.
The interval L between the outlines varies depending on the manufacturer of the liquid crystal panel and the size of the manufactured product, but is generally in the range of 10 mm to 100 mm.
The liquid crystal panel 10 to be bonded is placed at a predetermined interval (hereinafter referred to as a gap δ) with respect to the work stage 2 by the spacer 2a as described above.
As shown in FIG. 6, this interval is inconvenient if it is too narrow or too wide. If it is narrow, the light reflected on the surface of the work stage 2 (referred to as stage reflected light) does not reach the sealant 17. If it is too wide, the liquid crystal part is irradiated with light passing through the sealing agent having a width of 1 to 1.5 mm. From the experiment and calculation results, it is considered that 1 to 8 mm is appropriate for the interval between the work stage 2 and the liquid crystal panel 10 as will be described later.

Further, as shown in FIG. 7, the obliquely incident light travels inside the sealant 17 while being repeatedly reflected between the BM 15 and the reflecting surface of the work stage 2 or the glass substrate 12. However, as the number of reflections increases, the illuminance decreases accordingly.
For example, in the calculation, if the light is reflected three times by the reflection surfaces of the BM 15 and the work stage 2, the illuminance decreases to 30%.
In order to advance light to the depth of the sealing agent with a small number of reflections, it is desirable that the incident angle γ shown in FIG. From the experiment and calculation results, it is considered that the angle γ incident on the glass substrate is desirably 60 ° or more.
However, as shown in FIG. 8, when the incident angle γ increases, the position where reflected light reflected on the surface of the work stage 2 (hereinafter referred to as stage reflected light) reaches greatly changes with a slight difference in angle. The amount of change in the position where the reflected light reaches increases as the incident angle γ increases. The magnitude of the incident angle γ depends on the angle θ of the mirror 5 provided on the mask 3. Therefore, when the incident angle γ is increased, the stage reflected light cannot be appropriately applied to the sealing agent having a width of 1 to 1.5 mm unless the mirror angle θ is provided with high accuracy.

FIG. 9 shows the relationship between the incident angle γ to the liquid crystal panel 10 and the movement position of the stage reflected light. The horizontal axis is the incident angle γ to the liquid crystal panel, and the vertical axis is the distance from the position where the light is incident on the liquid crystal panel to the position where the light is reflected by the surface of the work stage and incident again on the liquid crystal panel (hereinafter referred to as horizontal This is referred to as a direction moving distance H). FIG. 10 shows the horizontal movement distance H.
The gap δ is the distance between the surface of the work stage 2 and the liquid crystal panel 10, and FIG. 9 shows seven cases where the gap is 0.5 mm to 10 mm.
Regardless of the size of the gap, the horizontal movement distance H of the reflected light increases as the incident angle γ increases. In each gap, the position of the angle at which the horizontal movement distance H changes by about 10 mm when the incident angle γ changes by 1 ° is indicated by ◯ in FIG.
In order to appropriately irradiate the sealing agent 17 having a width of 1 to 1.5 mm with the stage reflected light, if the amount of change in the horizontal movement distance H is further increased, the angle θ of the mirror provided on the mask is highly accurate. Adjustments must be made, making manufacturing adjustments difficult.
Therefore, it is judged that it is practical to set the incident angle γ within a range of approximately 80 ° to 85 °.
As the gap δ decreases, the amount of change in the horizontal movement distance H decreases, but the movement distance itself also decreases. As described above, since the range of the image interval L is 10 mm to 100 mm, it is desirable that the horizontal movement distance H of the reflected light can be freely set in the range of 10 mm to 100 mm. For example, when the gap δ is as small as 0.5 mm, the horizontal movement distance H can be set only in the range of 10 mm to 20 mm. If the horizontal movement distance H is to be increased, the incident angle γ must be increased. If this is the case, the amount of change in the horizontal movement distance H increases, and manufacturing adjustment becomes difficult as described above.
On the other hand, when the gap δ is increased to 10 mm, for example, the range of the horizontal movement distance H is increased. However, in order to cope with the narrow interval L of 30 mm or less, the above-described desirable incident angle is set to 60 ° or less. Become. Considering these, the gap between the work stage surface and the liquid crystal panel is considered to be 1 to 8 mm.

From the above, it is considered that the gap δ between the surface of the work stage 2 and the liquid crystal panel 10 is 1 to 8 mm and the incident angle γ to the mirror 5 is appropriately between 60 ° and 85 °.
The angle θ of the mirror 4 provided on the mask 3 is an expression shown in FIG. 11 from the relationship between the incident angle γ to the liquid crystal panel 10 and the incident angle θi from the center of the lamp 1a of the light irradiation unit 1 to the mirror 5. Is required.
After obtaining the incident angle γ to the liquid crystal panel 10 based on the gap between the surface of the work stage 2 and the liquid crystal panel 10 and the gap L of the contour, the angle θ of the mirror 5 provided on the mask 3 is calculated by this equation.
In addition, the irradiation angle of the light emitted from the lamp 1a of the light irradiation unit 1 is relatively small, and only one or two lamp lights are incident on each mirror. Therefore, in FIG. 11, only the light from the lamp closest to the mirror 5 needs to be considered.

  In the embodiment described above, the mirror 5 is provided on the light incident side of the mask 3 (the surface facing the light irradiating part). For example, as shown in FIG. It may be provided. In this case, since the light incident on the liquid crystal panel 10 is blocked by the mask 5, the size of the light shielding portion 3b of the mask 3 is made smaller than in the case of the above embodiment. That is, in the case of the above embodiment, the position A in the figure is the edge of the light shielding part 3a, but in the case of FIG. 11, B is the edge position of the light shielding part 3b.

It is a figure which shows schematic structure of the apparatus of the Example of this invention. It is a figure which shows a mode that the light which reflected on the mirror is irradiated to the sealing agent of the part which becomes a shadow by BM. It is a schematic perspective view of the mask of the Example of this invention. It is a figure which shows the relationship between the space | interval of an outline, and the angle of a mirror. It is a figure which shows an example of the outline actually manufactured on a glass substrate. It is a figure which shows the relationship between the magnitude | size of a gap, and the irradiation position of the light reflected on the work stage. It is a figure which shows a mode that the light which injected diagonally advances to the inside of a sealing agent, repeating reflection. It is a figure which shows the relationship between the incident angle (gamma) of light, and the position where stage reflected light reaches. It is a graph which shows the relationship between the incident angle (gamma) to a liquid crystal panel, and the movement position of stage reflected light. It is a figure explaining the horizontal movement distance H. FIG. It is a figure which shows the relationship between incident angle (gamma) and incident angle (theta) i from a lamp center to a mirror. It is a figure which shows the case where a mirror is provided in the light emission side of a mask. It is a figure which shows an example of a liquid crystal panel (color liquid crystal panel). It is a figure which shows an example of a mask. It is a figure which shows an example of the bonded liquid crystal panel. It is a figure explaining the part which becomes a shadow of the light-shielding part formed by BM etc. It is a figure explaining that irradiation of the ultraviolet-ray to a liquid-crystal part can be prevented by BM. It is a figure explaining the prior art example which irradiates light to a liquid crystal panel from diagonally. It is a figure which shows a mode that light advances, repeating reflection in the sealing compound of a liquid crystal panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light irradiation part 1a Bar-shaped lamp 2 Work stage 2a Spacer 3 Mask 3a Light transmission part 3b Light-shielding part 4 Mask stage 5 Mirror 10 Liquid crystal panel (work)
11 Glass substrate 12 Glass substrate 13 TFT element 14 Wiring part 15 Black matrix (BM)
16 Alignment film 17 Sealant 18 Electrode 19 Liquid crystal

Claims (1)

A light irradiation unit for irradiating ultraviolet rays;
The work stage on which the surface is formed of a light reflecting member and the display panel material to be bonded is placed with a predetermined interval with respect to the surface;
A mask provided between the light irradiator and the display panel material and having a light shielding pattern formed so that light is not irradiated to the liquid crystal of the display panel;
In the display panel material, a light-shielding portion is formed on at least one of the two light-transmitting substrates, and an ultraviolet curable sealant and a liquid crystal are sandwiched between the two light-transmitting substrates to form an integral shape. And in the bonding device of the display panel irradiated with ultraviolet rays from the substrate side on which the light shielding part is formed,
The mask is provided with a light reflecting member that reflects the light applied to the mask so that it is incident obliquely on the ultraviolet curable sealant under the light shielding portion of the display panel material. A display panel bonding device.

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