JP7143100B2 - DISPLAY DEVICE AND METHOD FOR MANUFACTURING DISPLAY DEVICE - Google Patents

Description

The present invention relates to a display device and a manufacturing method of the display device.

A display device is known in which a front panel such as a touch panel or a decorative panel is mounted on the front surface of a display panel such as a display panel. An optical bonding technique is known in which the gap between the display panel and the front panel is filled with a transparent adhesive such as OCR (Optical Clear Resin) (see, for example, Patent Document 1).

JP 2016-164633 A

By the way, Patent Document 1 has a configuration in which a bezel having a frame covering the peripheral edge of the display panel on the display surface side is provided, and the bezel is sandwiched between the front panel and the display panel. Further, a resin member is formed along the entire circumference of the open end of the bezel, OCR is filled in the display area surrounded by the resin member, the bezel and the front panel are adhered with an adhesive, and the OCR is formed by the resin member. Prevents outflow.
However, this configuration requires a bezel sandwiched between the front panel and the display panel, and after forming a resin member inside this bezel, it is necessary to fill the OCR and bond the bezel and the front panel. , and the configuration and the like are complicated.
SUMMARY OF THE INVENTION It is an object of the present invention to make it possible to suppress outflow of OCR and the like with a simple configuration without requiring a bezel between the display panel and the front panel.

The present invention provides a display device comprising a display panel and a front panel bonded to the display panel with a transparent adhesive, wherein a metal bezel covering the side surface of the display panel and a gap between the display panel and the front panel are provided. The display panel includes a TFT substrate, a CF substrate, and electronic components arranged on a portion of the TFT substrate projecting from the CF substrate on one side on the front side of the display panel. and, when the display device is viewed from the front, the metal bezel and the CF substrate are spaced apart from each other, and the plurality of spacers are disposed between the metal bezel and the CF substrate when the display device is viewed from the front. The space between the display panel and the front panel is enclosed between the display panel and the front panel, and the space corresponding to the display area of the display panel is enclosed. All the spacers block the outflow of the transparent adhesive to the outside. An outflow suppressing material and a member for adjusting the thickness of the transparent adhesive are configured, the transparent adhesive fills the space, and the electronic component is the metal part when viewed from the front of the display device. arranged between the bezel and the CF substrate, the front side thereof being covered with one of the spacers and the front panel, the spacer having a portion covering at least part of the electronic component made of metal; Shielding the radiation noise of the electronic component, the remaining spacers have a narrower width than the spacers covering the electronic component, and all the spacers are a resin film having an adhesive layer on one side of a metal foil. Characterized by

In the display device according to the present invention, the spacer has a gap between any of a plurality of spacers arranged along the periphery of the display region, which communicates the space with a space outside the spacer. It is characterized by

According to the present invention, in the display device described above, the front panel includes a front panel for detecting a touch position at a portion corresponding to the display area of the display panel.

According to the present invention, in the display device described above, the spacer is a member having an adhesive layer provided on at least one surface of a metal foil.

According to the present invention, in the display device described above, the spacer overlaps with the entire electronic component when the display device is viewed from the front.

The present invention provides a method of manufacturing a display device comprising a display panel and a front panel bonded to the display panel with a transparent adhesive, wherein a metal bezel covering the side surface of the display panel is provided, and a TFT substrate included in the display panel is provided. and a CF substrate, wherein electronic components are arranged on a portion of the TFT substrate projecting from the CF substrate on one side on the front side of the display panel, and when viewed from the front of the display device, the metal bezel and the CF substrate is spaced apart from the display panel and the front panel, and covers the gap between the metal bezel and the CF substrate when viewed from the front of the display device, and corresponds to the display area of the display panel. A plurality of spacers surrounding a space surrounding the adhesive are interposed , and all the spacers constitute an outflow suppressing material that blocks the outflow of the transparent adhesive to the outside, and a member that adjusts the thickness of the transparent adhesive, The space surrounded by the spacers is filled with the transparent adhesive, and when viewed from the front of the display device, the front side of the electronic component arranged between the metal bezel and the CF substrate is one of the spacers, and the a front panel, wherein the spacer has a portion that covers at least a portion of the electronic component made of metal and shields radiation noise from the electronic component , and the remaining spacer is larger than the spacer that covers the electronic component. It has a narrow width, and all the spacers are resin films having an adhesive layer on one side of a metal foil .

According to the present invention, in the method of manufacturing the display device described above, a gap is provided between any of a plurality of spacers arranged along the periphery of the display region to connect the space to a space outside the spacer. It is characterized in that it is arranged

ADVANTAGE OF THE INVENTION According to this invention, the bezel between a display panel and a front panel is not essential, and it is effective in being able to suppress the outflow of OCR etc. with a simple structure.

It is the figure which looked at the display device concerning the embodiment of the present invention from the front. 1 is an exploded perspective view of a display device; FIG. FIG. 2 is a cross-sectional view taken along line III-III in FIG. 1;

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view of a display device 10 according to an embodiment of the present invention. 2 is an exploded perspective view of the display device 10. FIG.
As shown in FIGS. 1 and 2 , the display device 10 includes a display panel 11 and a front panel 12 arranged on the front side of the display panel 11 . In FIG. 1, for convenience of explanation, the outline of the front panel 12 is indicated by a chain double-dashed line.
The display panel 11 of this embodiment is a liquid crystal display, and includes a rectangular liquid crystal cell 21 having a display surface 21A on the front side, a backlight unit 22 arranged on the back side of the liquid crystal cell 21, and a metal bezel 23. , and a rear panel 24, and are formed in a rectangular flat plate shape as a whole. The display surface 21A also has a rectangular display area 21X in which an image or the like is displayed, and a non-display area 21Y surrounding the display area 21X.
The liquid crystal cell 21 includes a TFT (Thin Film Transistor) substrate 25 and a CF (Color Filter) substrate 26, both of which are made of rectangular glass. The TFT substrate 25 and the CF substrate 26 are provided integrally with the liquid crystal sandwiched therebetween, and the CF substrate 26 is arranged on the front side of the liquid crystal cell 21 (corresponding to the display surface 21A side). A polarizing plate 27 is arranged on the rear surface of the TFT substrate 25 , and a polarizing plate 28 is arranged on the front surface of the CF substrate 26 .
The TFT substrate 25 has a portion projecting from the CF substrate 26 on one side, and a plurality of driving components 29 for driving the liquid crystal cell 21 are spaced apart in front of the liquid crystal cell 21 in this projecting portion. are placed. The driving component 29 is a liquid crystal driver IC or the like. The components arranged on the TFT substrate 25 are not limited to the driving components 29, and may be other electronic components. These drive components 29 and liquid crystal cell 21 are supplied with external power, video signals, and the like from an FPC (Flexible Printing Circuit) 30 .

The backlight unit 22 is formed in a rectangular flat plate shape substantially the same as the display panel 11, and emits illumination light for illuminating the display surface 21A.
The metal bezel 23 is a frame-shaped metal member, and covers the entire side surfaces of the liquid crystal cell 21 and the backlight unit 22 . The material of the metal bezel 23 is not limited to metal, and may be an organic material such as resin or an inorganic material such as ceramic.
The rear panel 24 is a rectangular member made of metal and covers the rear surface of the backlight unit 22 . The material of the back panel 24 is not limited to metal, and may be an organic material such as resin or an inorganic material such as ceramic.

The front panel 12 is formed of a transparent flat plate member that covers the display surface 21A of the display panel 11 from the front side. This is a decorative panel that blinds the non-display area 21Y by applying decorative printing such as black to the area overlapping the non-display area 21Y.
Note that the front panel 12 may be a touch panel that detects a user's touch operation on an area corresponding to the display area 21X.
The front panel 12 is arranged to overlap the display panel 11 with a plurality of spacers 31 interposed between the front panel 12 and the display panel 11 .

The plurality of spacers 31 are made of metal, and more specifically, have a configuration in which a resin film having an adhesive layer 31A (FIG. 3) is attached to one side of a metal foil. This spacer 31 has an adhesive layer 31A on the opposite side of the metal foil and can be easily attached to the front panel 12 or the like. For example, the spacer 31 employs a structure similar to that of a known metal tape such as an aluminum tape. Also, a known metal tape may be employed as the spacer 31 . Note that the structure is not limited to the structure in which only one side of the spacer 31 is an adhesive layer, and both sides of the spacer 31 may be an adhesive layer. In this case, it becomes possible to attach the spacer 31 to both the front panel 12 and the display panel 11 .

In this configuration, a linear metal tape is cut into lengths substantially equal to the lengths of all four sides of the liquid crystal cell 21 , and each metal tape is used as four spacers 31 near each side of the liquid crystal cell 21 . Glued along each side.
In the attached state, as shown in FIG. 1, each spacer 31 overlaps the entire drive component 29 and is arranged with a gap α between each other when viewed from the front of the display device 10 . Thereby, gaps α are formed at positions corresponding to the four corners of the display area 21X.

FIG. 3 is a cross-sectional view taken along line III-III of FIG.
In this configuration, the OCR 40 fills the space between the display panel 11 and the front panel 12 , and the OCR 40 bonds the front panel 12 to the display panel 11 . The display performance of the display device 10 can be improved by using, for the OCR 40, a material having an optical characteristic (for example, a refractive index) that contributes to the display of the display device 10. FIG.

Here, the spacer 31 is attached to the non-display area 21Y existing around the display area 21X of the display surface 21A and does not interfere with the display of the display area 21X.

Between the display panel 11 and the front panel 12, a space V corresponding to the thickness of the spacer 31 (corresponding to the gap indicated by the height d in FIG. 3) is formed. can adjust the height d of the space V between the display panel 11 and the front panel 12, that is, the thickness of the OCR 40 can be adjusted.
Further, as shown in FIGS. 2 and 3, the spacer 31 covers the drive component 29 from the front side of the display device 10, so that the metal spacer 31 shields the radiation noise of the drive component 29 and prevents the display device from Electromagnetic waves on the front side of 10 can be reduced. In addition, since the metal spacer 31 can shield external noise from reaching the drive component 29, malfunction of the drive component 29 and the like can be suppressed. Furthermore, since the spacer 31 can shield the radiation noise of the drive component 29 as described above, when a touch panel is used for the front panel 12, the influence of the radiation noise on the touch panel can also be suppressed.
Incidentally, as shown in FIGS. 1 and 2, the spacer 31 arranged in the portion covering the drive component 29 has a width sufficient to shield radiation noise, but the other spacers 31 are Narrower widths are possible. Further, the spacer 31 may cover only a part of the drive component 29 as long as the electromagnetic wave on the front side of the display device 10 can be reduced and the malfunction of the drive component 29 can be suppressed.

Next, a method for manufacturing the display device 10 will be described.
First, each spacer 31 is attached to the front panel 12 (first step). During this first step, each spacer 31 is arranged along each of the four sides of the liquid crystal cell 21 as described above, and overlaps with the entire drive component 29 when viewed from the front of the display device 10. Then, it is attached to the non-display area 21Y around the display area 21X.
Also, since the gaps α are formed between the spacers 31, the space V between the display panel 11 and the front panel 12 can be communicated with the external space by these gaps α.

Next, a sufficient amount of OCR 40 is supplied to fill the space V within the area surrounded by the spacers 31 on the surface of the front panel 12 (second step).

Next, the pre-assembled display panel 11 is stacked on the front panel 12 with the display surface 21A facing the front panel 12 (third step). The OCR 40 is pressed by the stacked display panel 11 and extends over the area surrounded by each spacer 31 in the face of the front panel 12 . The space V is filled with the OCR 40, and the display panel 11 and the front panel 12 are bonded together by curing the OCR 40. FIG. During the third step, each spacer 31 functions as an outflow suppressing material (also referred to as a dam material) that blocks outflow of the OCR 40 to the outside, thereby suppressing the outflow of the OCR 40 to the outside.

Since the height d of the space V corresponds to the thickness of one spacer 31, the height d does not become excessively large, and the height d can be easily adjusted by adjusting the thickness of the spacer 31. .
Since the spacer 31 of this embodiment is formed of the metal foil and the resin film as described above, the height d of the space V can be adjusted to a very small amount. As a result, the display panel 11 and the front panel 12 can be attached closer together, and the visibility of the display area 21X of the display surface 21A can be improved.
Therefore, the work of filling the space V (optical bonding) can be facilitated, making it easier to facilitate manufacturing and reduce the rate of occurrence of defective products.

Furthermore, since the gap α is formed between the spacers 31, the air between the display panel 11 and the front panel 12 can be easily released to the outside when filling the OCR 40 by optical bonding. This also facilitates the work of filling the space V. As shown in FIG.
As described above, the display panel 11 and the front panel 12 are assembled, and the display device 10, which is a device having them integrally, is manufactured.

By the way, after the display device 10 is manufactured, there is a possibility that air bubbles or the like may be generated between the front panel 12 and the display panel 11 due to leakage of a small amount of air, gas, or moisture from the front panel 12, the display panel 11, or the like. There is
In this configuration, since the gaps α are formed between the spacers 31, air, gas, moisture, etc. existing between the front panel 12 and the display panel 11 can be released to the outside through the gaps α. can. Therefore, generation of air bubbles and the like can be suppressed.

As described above, in this embodiment, the spacer 31 is interposed between the display panel 11 and the front panel 12 bonded to the display panel 11 by the OCR 40. The spacer 31 is connected to the display panel 11. A space V corresponding to the display area 21X of the display surface 21A is enclosed with the front panel 12, and the OCR 40 fills the space V. As shown in FIG.
As a result, the spacer 31 functions also as a member for providing the space V and as an outflow suppressing material that suppresses the outflow of the OCR 40 to the outside. reduced. Therefore, it is necessary to provide a bezel sandwiched between the front panel and the display panel, form a resin member inside the bezel, fill the OCR, and bond the bezel and the front panel. The configuration can be made simpler than the configuration or the like. In other words, it is possible to suppress outflow of OCR and the like with a simple configuration without requiring a bezel or the like between the display panel and the front panel.
Moreover, the spacer 31 can reduce the height d of the space V between the display panel 11 and the front panel 12, which is advantageous for thinning the display device 10 and facilitating the optical bonding work. The amount of OCR 40 used can also be suppressed.

Further, in the present embodiment, a plurality of spacers 31 are arranged along the periphery of the display region 21X, and a gap α is provided between the spacers 31 to communicate the space V inside the spacer 31 and the space outside the spacer 31. there is As a result, the air between the display panel 11 and the front panel 12 can be easily released to the outside when filling the OCR 40 by optical bonding, and the work of filling the space V can be facilitated.
Also, air, gas, moisture, etc. existing between the front panel 12 and the display panel 11 can be released to the outside from each gap α. Therefore, generation of air bubbles and the like can be suppressed.

Further, in this embodiment, the spacer 31 is made of metal, electronic components are arranged around the liquid crystal cell 21, and at least some of the plurality of driving components 29 arranged on the front side of the liquid crystal cell 21 is covered to shield the radiation noise of the driving component 29 . As a result, the spacer 31 functions as an outflow suppressing material that suppresses outflow of the OCR 40 to the outside and as an electromagnetic shield.

As the front panel 12 of the display device 10, it is possible to provide a touch panel for detecting a touch position at a portion corresponding to the display area 21X of the display surface 21A. Since the metal spacer 31 can shield the radiation noise of the drive component 29, the influence of the radiation noise on the touch panel can be suppressed.

Further, in this embodiment, each spacer 31 is a member having an adhesive layer 31A provided on one side thereof. This facilitates attachment of each spacer 31 .

Further, in the present embodiment, each spacer 31 overlaps the entire drive component 29 when the display device 10 is viewed from the front. As a result, radiation noise to the front side of the display device 10 can be effectively blocked, and the influence of external noise on the drive components 29 can be effectively avoided.

In the manufacturing process of the display device 10 of the present embodiment, a spacer 31 is inserted between the display panel 11 and the front panel 12 to surround the space V corresponding to the display area 21X of the display surface 21A. The surrounding space V is filled with OCR40. As a result, in the process of bonding the display panel 11 via the OCR 40, each spacer 31 functions as an outflow suppressing material that blocks the outflow of the OCR 40 to the outside, thereby suppressing the outflow of the OCR 40 to the outside.
Moreover, since the height d of the space V corresponds to the thickness of one spacer 31, the height d does not become excessively large, and the height d can be easily adjusted by adjusting the thickness of the spacer 31. is. Therefore, the work of filling the space V can be facilitated, and the manufacturing of the display device 10 can be facilitated, and the rate of occurrence of defective products can be easily reduced.

Further, in the manufacturing process of the display device 10 of the present embodiment, a plurality of spacers 31 are arranged along the periphery of the display region 21X. are arranged with α. As a result, air between the display panel 11 and the front panel 12 can be easily released to the outside in the process of bonding the display panel 11 via the OCR 40, and the work of filling the space V can be facilitated. Air, gas, moisture, and the like existing between the front panel 12 and the display panel 11 are released from each gap α to the outside, thereby suppressing the generation of air bubbles inside the OCR 40 .

Note that the above-described embodiment is merely an example of one aspect of the present invention, and can be arbitrarily modified and applied within the scope of the gist of the present invention.
For example, although the case of using a liquid crystal display as the display panel 11 has been described, a wide range of known display panels to which techniques such as organic EL, electronic paper, and plasma are applied can be used.
Also, the spacer 31 may use a metal plate instead of the metal foil. Also, any kind of metal may be used as long as it can cut off noise. Moreover, the spacer 31 arranged in a place other than the portion covering the drive component 29 may be made of a member such as a resin that does not function as an electromagnetic shield. Furthermore, the spacer 31 that covers the drive component 29 may be made of metal only in the portion that covers the drive component 29, and the other portion may be made of a member such as resin that does not function as an electromagnetic shield.
Moreover, although the front panel 12 of the display device 10 of the present embodiment is a decorative panel or a touch panel, these may be used together. That is, a decorative panel may be further arranged to give decoration to the periphery of the touch panel arranged as the front panel 12 . A protection panel for protecting the display panel 11 may be provided instead of the decorative panel.
In addition, although OCR40 is used in this embodiment, a known transparent adhesive such as a film-like adhesive sheet called OCA (Optical Clear Adhesive) can be widely applied.

10 display device 11 display panel 12 front panel 21 liquid crystal cell 21A display surface 21X display area 21Y non-display area 22 backlight unit 23 metal bezel 24 rear panel 25 TFT substrate 26 CF substrate 27, 28 polarizing plate 29 drive parts (electronic parts )
30 FPCs
31 spacer 31A adhesive layer 40 OCR
V Space d Height α Gap

Claims (7)

A display device comprising a display panel and a front panel bonded to the display panel with a transparent adhesive,
a metal bezel that covers the sides of the display panel;
a plurality of spacers interposed between the display panel and the front panel;
The display panel includes a TFT substrate,
a CF substrate;
an electronic component arranged in a portion of the TFT substrate projecting from the CF substrate on one side on the front side of the display panel;
When viewed from the front of the display device, the metal bezel and the CF substrate are arranged apart from each other,
The plurality of spacers cover a gap between the metal bezel and the CF substrate in a front view of the display device, and a space corresponding to a display area of the display panel between the display panel and the front panel. and all the spacers constitute an outflow suppressing material that blocks the outflow of the transparent adhesive to the outside, and a member that adjusts the thickness of the transparent adhesive,
The transparent adhesive fills the space,
The electronic component is arranged between the metal bezel and the CF substrate when viewed from the front of the display device, and the front side is covered with one spacer and the front panel,
a portion of the spacer covering at least a portion of the electronic component is made of metal and shields radiation noise of the electronic component;
the remaining spacers have a narrower width than the spacers covering the electronic component;
All the spacers are resin films having an adhesive layer on one side of the metal foil
A display device characterized by: 2. The spacer according to claim 1, wherein said spacer has a gap between any of a plurality of spacers arranged along the periphery of said display area, which communicates said space with a space outside said spacer. Display device as described. 3. The display device according to claim 1, wherein the front panel includes a front panel for detecting a touch position at a portion corresponding to a display area of the display panel. 4. The display device according to claim 1, wherein the spacer is a member having an adhesive layer provided on at least one surface of a metal foil. 5. The display device according to claim 1, wherein the spacer overlaps the entire electronic component when viewed from the front of the display device. In a method for manufacturing a display device comprising a display panel and a front panel bonded to the display panel with a transparent adhesive,
A metal bezel covering the side surface of the display panel is provided,
In a TFT substrate and a CF substrate included in the display panel, electronic components are arranged on a portion of the TFT substrate projecting from the CF substrate on one side on the front side of the display panel,
Disposing the metal bezel and the CF substrate apart from each other when viewed from the front of the display device,
A plurality of spacers are provided between the display panel and the front panel to cover a gap between the metal bezel and the CF substrate and surround a space corresponding to the display area of the display panel when viewed from the front of the display device. All the spacers are interposed to form an outflow suppressing member that blocks the outflow of the transparent adhesive to the outside, and a member that adjusts the thickness of the transparent adhesive,
filling the space surrounded by the spacer with the transparent adhesive;
When viewed from the front of the display device, the front side of the electronic component arranged between the metal bezel and the CF substrate is covered with one spacer and the front panel,
a portion of the spacer covering at least a portion of the electronic component is made of metal and shields radiation noise of the electronic component ;
the remaining spacers have a narrower width than the spacers covering the electronic component;
A method of manufacturing a display device , wherein all the spacers are resin films having an adhesive layer on one side of a metal foil . 3. The spacers are arranged with a gap between any one of a plurality of spacers arranged along the periphery of the display area, the gap communicating the space with a space outside the spacers. 7. The manufacturing method of the display device according to 6.

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