JP2012073289A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device in which strength necessary for a bonding layer is maintained also with formation of a mask band.SOLUTION: The image display device includes an image display panel 5, a translucent protection panel 2 for covering a front face of the image display panel, a bonding layer 3 formed by curing a photo curable resin and interposed between the image display panel and the protection panel, and a mask band 4 formed in a frame shape at a rear face of the protection panel while facing the outer periphery of the image display face of the image display panel. In the mask band 4, light transmissivity gradually lowers from an inner circumferential part toward an outer circumferential part.

Description

  The present invention relates to an image display device provided with a translucent protective panel covering an image display surface of an image display unit.

  Conventionally, in an image display device such as a television receiver, a transparent glass protective panel (2) is provided to cover the image display surface (10) of the image display unit (1) as shown in FIG. .

The image display unit (1) includes an image display panel (5) such as a liquid crystal display panel, a lens film (12) and a diffuser film (13) provided on the back side thereof, and a backlight provided on the back side thereof. (11), a panel guide (14) for supporting the image display panel (5), and a metal frame (6) for holding the image display panel (5) on the panel guide (14).
The metal frame (6) has a frame-shaped front edge portion (61) that comes into contact with the outer peripheral portion of the front surface of the image display panel (5). The front edge portion (61) is formed by combining four side frame portions.

Between the image display unit (1) and the protective panel (2), a bonding layer (3) obtained by curing a photo-curable resin (31) is interposed, and the image display unit (1) is formed by the bonding layer (3). The protective panel (2) is joined to the front surface of).
As the photocurable resin (31), for example, an ultraviolet-curing acrylic adhesive resin can be used. In this case, as shown in FIG. 2, after the photocurable resin (31) is applied to the surface of the image display unit (1), the protective panel (2) is overlaid on the surface of the photocurable resin (31). In this state, ultraviolet rays (7) are irradiated from the surface side of the protective panel (2) to cure the photocurable resin (31) (see Patent Document 1).
As a result, the protective panel (2) is joined to the front surface of the image display unit (1).

WO2009 / 011366

By the way, in the conventional image display device, since the front edge portion (61) of the metal frame (6) has, for example, a screw hole or the like, the front edge portion (61 ) Is visible to the viewer, there is a design problem. Therefore, as shown in FIG. 11, a black mask band (40) extending in a frame shape along the front edge portion (61) of the metal frame (6) is printed on the back surface of the protective panel (2).
The mask band (40) has a width W that covers from the outer peripheral edge of the front edge portion (61) of the metal frame (6) to the inner side of the inner peripheral edge of the front edge portion (61). This prevents the viewer from seeing the front edge portion (61) of the metal frame (6) through the protective panel (2).

  However, in the image display device in which the mask band (40) is printed on the back surface of the protective panel (2) as shown in FIG. 11, the ultraviolet ray (7) is irradiated to the photocurable resin (31) in the assembly process as described above. When this is cured, the region not covered by the mask band (40) is sufficiently irradiated with ultraviolet rays (7), but the region covered by the mask band (40) Since the ultraviolet ray (7) is blocked by 40), a sufficient amount of the ultraviolet ray (7) is not irradiated.

  As a result, the photo-curable resin (31) covering the front edge portion (61) of the metal frame (6) is not sufficiently cured, and thereby the bonding layer (61) covering the front edge portion (61) of the metal frame (6). The strength of 3) will be reduced.

  In particular, since the front edge portion (61) of the metal frame (6) is configured by combining four side frame portions, the strength against the action of external force is low. Here, when an external force is applied to the protective panel (2) in the front direction, that is, in the direction opposite to the image display panel (5) (for example, an external force due to the weight of the protective panel itself), the front edge portion A force in the front direction is also applied to (61). In this case, if the adhesive strength between the front edge portion (61) and the image display panel (5) is weak, the front edge portion (61) is bent in the front direction as shown by a two-dot chain line in FIG. There is a problem that a gap is generated between the front edge portion (61) and the image display panel (5).

  SUMMARY OF THE INVENTION An object of the present invention is to provide an image display device capable of maintaining the strength required for a bonding layer even by forming a mask band.

An image display device according to the present invention includes:
An image display panel;
A translucent protective panel covering the front surface of the image display panel;
A bonding layer formed by curing a photocurable resin, interposed between the image display panel and the protection panel,
The back surface of the protective panel is provided with a mask band formed in a frame shape so as to face the outer peripheral part of the image display surface of the image display panel, and the mask band gradually moves from the inner peripheral part side toward the outer peripheral part side. However, the light transmittance is lowered.

  According to the image display device of the present invention, since the light transmittance of the mask band gradually increases toward the inner peripheral side, in the assembly process of the image display device, a photocurable resin is applied to the surface of the image display panel. After coating, the protective panel is overlaid on the surface of the photocurable resin, and in this state, by irradiating light from the surface side of the protective panel, the amount of light irradiated to the photocurable resin through the mask band is Bonding has a high bonding strength because the photo-curing resin which is gradually increased from the outer peripheral side of the mask band toward the inner peripheral side, especially the photo-curing resin covered by the inner peripheral side of the mask band is sufficiently cured Become a layer.

  In a specific aspect, the mask band is formed of a black dot pattern or a stripe pattern.

  According to the specific aspect, since the mask band is formed from a black dot pattern or stripe pattern, by irradiating light from the surface side of the protective panel in the assembly process of the image display device, the light is The light passes through the mask band and enters the photocurable resin. As a result, the photo-curing resin is cured and becomes a bonding layer having sufficient bonding strength.

In a more specific aspect, the image display device according to the present invention includes:
An image display unit (1) having an image display surface (10);
A protective panel (2) disposed over the image display surface (10);
Bonding layer (3) formed by curing photo-curable resin (31) and interposed between image display unit (1) and protective panel (2)
The image display unit (1)
An image display panel (5) having the image display surface (10) formed on the front surface;
A metal frame (6) for holding the image display panel (5), having a frame-shaped front edge portion (61) in contact with the outer periphery of the front surface of the image display panel (5)
And has.

  A mask strip (4) extending in a frame shape along the front edge portion (61) of the metal frame (6) is formed on the back surface of the protective panel (2). A width dimension W that can cover at least the inner peripheral edge (62) on the image display surface (10) side of the front edge portion (61) of the metal frame (6) and the vicinity thereof in the width direction orthogonal to the current direction. The light transmittance for curing the photocurable resin (31) gradually increases toward the image display surface (10) along the width direction.

In the assembly process of the image display device, after applying the photocurable resin (31) to the surface of the image display unit (1), the protective panel (2) is overlaid on the surface of the photocurable resin (31), In this state, light is irradiated from the surface side of the protective panel (2) to cure the photocurable resin (31).
At this time, the photocurable resin (31) covered with the mask band (4) is irradiated with light transmitted through the mask band (4). Since the light transmittance gradually increases from the outer peripheral side to the inner peripheral side (image display surface side) along the direction, the amount of light irradiated to the photocurable resin (31) The photocurable resin (31) which gradually increases from the outer peripheral side of (4) toward the inner peripheral side (image display surface side) and is covered by the inner peripheral part of the mask band (4) is sufficiently Curing becomes a bonding layer (3) having high bonding strength.

  In particular, the photocurable resin (31) that covers the vicinity of the edge of the front edge portion (61) of the metal frame (6) receives a sufficient amount of light and has a sufficiently high bonding strength (3). It becomes. Therefore, even when the front edge portion (61) is configured by combining a plurality of frame portions with each other, the front edge portion (61) of the metal frame (6) and the surface of the image display panel (5) by the action of external force. There is no risk of a gap between the two.

  In the image display device assembled in this way, a mask band (4) is formed so as to cover the front edge portion (61) of the metal frame (6), and the mask band (4) is formed in the width direction. As the light transmittance gradually decreases from the inner peripheral side to the outer peripheral side along the line, the entire front edge part (61) of the metal frame (6) is viewed through the protective panel (2). It will not be clearly visible to the person.

In a specific embodiment, the mask band (4) is formed of a black dot pattern, and the dot density gradually decreases toward the image display surface (10) along the width direction thereof.
Thus, the mask band (4) gradually transmits light for curing the photocurable resin (31) from the outer peripheral side to the inner peripheral side (image display surface side) along the width direction. Will increase.
Such a mask band (4) can be easily formed by printing a black dot pattern on the back surface of the protective panel (2).

In another specific embodiment, the mask band (4) is formed by a black stripe pattern extending in the extending direction of the mask band (4), and gradually toward the image display surface (10) side along the width direction. , Stripe density has decreased.
Thus, the mask band (4) gradually transmits light for curing the photocurable resin (31) from the outer peripheral side to the inner peripheral side (image display surface side) along the width direction. Will increase.
Such a mask band (4) can be easily formed by printing a black stripe pattern on the back surface of the protective panel (2).

  According to the image display device of the present invention, the strength required for the bonding layer can be maintained even by forming a mask band.

FIG. 1 is a perspective view of an image display apparatus according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a process of bonding a protective panel to the image display unit in assembling the image display apparatus. FIG. 3 is an exploded perspective view of the image display unit and the protection panel. FIG. 4 is a perspective view of the protective panel as seen from the back side. FIG. 5 is an enlarged view showing a pattern example of the mask band. FIG. 6 is an enlarged view showing another pattern example of the mask band. FIG. 7 is an enlarged view showing another pattern example of the mask band. FIG. 8 is an enlarged view showing another pattern example of the mask band. FIG. 9 is an enlarged view showing still another pattern example of the mask band. FIG. 10 is a cross-sectional view showing a main part of an image display apparatus according to an embodiment of the present invention. FIG. 11 is a cross-sectional view showing a main part of a conventional image display apparatus.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
As shown in FIG. 1, an image display apparatus according to an embodiment of the present invention is configured by bonding a protective panel (2) made of transparent glass to a front surface of an image display unit (1) through a bonding layer (3). Is done.

In the assembly process of the image display device, as shown in FIG. 2 (a), a photocurable resin (31), which is an acrylic adhesive resin that is cured by irradiation of ultraviolet rays, is applied to the surface of the image display unit (1). After that, the protective panel (2) is overlaid on the surface of the photocurable resin (31). In this state, ultraviolet rays (7) are irradiated from the surface side of the protective panel (2) as shown in FIG. 2B to cure the photocurable resin (31).
As a result, the protective panel (2) is joined to the front surface of the image display unit (1).

  As shown in FIG. 10, the image display unit (1) is composed of an image display panel (5) composed of a liquid crystal display panel having an image display surface (10) formed on the front surface, and a lens film (12 ) And a diffuser film (13), a backlight (11) arranged on the back side thereof, a panel guide (14) for supporting the image display panel (5), and an image display panel on the panel guide (14) ( 5) and a metal frame (6) for holding.

  The metal frame (6) is composed of a front frame (63) and a back frame (64). The front frame (63) has four side frame pieces (63a) (63b) (63c) (63d) as shown in FIG. ) Are combined with each other. Each of the frame pieces (63a), (63b), (63c), and (63d) has a front edge portion (61) that comes into contact with the outer peripheral portion of the front surface of the image display panel (5) as shown in FIG.

As shown in FIG. 4, a mask band (4) is formed on the back surface of the protective panel (2) by printing. As shown in FIG. 3, the mask band (4) extends in a frame shape along the front edge portion (61) of the metal frame (6), and in the width direction perpendicular to the extending direction, It has a width dimension W larger than the width dimension B of the edge portion (61).
As shown in FIG. 10, the mask band (4) extends in the width direction from the outer peripheral edge of the protective panel (2) to the inner edge (62) of the front edge (61) of the metal frame (6). And covers the entire front edge portion (61).

The mask band (4) has an ultraviolet ray transmittance gradually increasing from the outer peripheral side toward the inner peripheral side (image display surface side) along the width direction.
For example, as shown in FIG. 5, a dot pattern made of an aggregate of circular black dots can be printed on the back surface of the protective panel (2) to form a mask band (4). In the mask band (4), the dot size gradually decreases from the outer peripheral side to the inner peripheral side along the width direction of the mask band (4), and the dot density decreases accordingly. is doing.

  Alternatively, as shown in FIG. 6, a dot pattern composed of a collection of square black dots can be printed on the back surface of the protective panel (2) to form a mask band (4). Also in the mask band (4), the size of the dots gradually decreases from the outer peripheral side to the inner peripheral side along the width direction of the mask band (4), and the dot density decreases accordingly. is doing.

  Alternatively, as shown in FIG. 7, a dot pattern made of an aggregate of rhombus black dots can be printed on the back surface of the protective panel (2) to form a mask band (4). Also in the mask band (4), the size of the dots gradually decreases from the outer peripheral side to the inner peripheral side along the width direction of the mask band (4), and the dot density decreases accordingly. is doing.

Alternatively, as shown in FIG. 8, a stripe pattern composed of an aggregate of black stripes extending in the extending direction of the mask band (4) is printed on the back surface of the protective panel (2), and this is printed on the mask band (4). It can be. In the mask band (4), the stripe width gradually decreases from the outer peripheral side to the inner peripheral side along the width direction of the mask band (4), and the density of the stripe decreases accordingly. ing.
Note that the stripes constituting the mask band (4) may be a polygonal line or a wavy line as shown in FIG.

In any of the mask bands (4) shown in FIGS. 5 to 9, the transmittance of ultraviolet rays gradually increases from the outer peripheral side to the inner peripheral side (image display surface side) along the width direction. .
Such a mask band (4) does not continuously change the density of dots and stripes, but simply realizes gradation by changing the density, so printing can be easily performed using one color ink. Can be done.

In the assembly process of the image display device, as shown in FIG. 10, when the photocurable resin (31) is cured by irradiating ultraviolet rays (7) from the surface side of the protective panel (2), the mask band (4) is used. The uncovered photocurable resin (31) is directly irradiated with ultraviolet rays (7) transmitted through the protective panel (2).
As a result, in the region not covered with the mask band (4), the photo-curable resin (31) is sufficiently cured, and a bonding layer (3) having a high bonding strength is formed.

  On the other hand, the photocurable resin (31) covered with the mask band (4) is irradiated with ultraviolet rays (7) transmitted through the mask band (4). Here, since the transmittance of the ultraviolet ray (7) gradually increases from the outer peripheral side to the inner peripheral side along the width direction of the mask band (4), the photo-curing resin (31) is irradiated. The amount of ultraviolet rays (7) applied gradually increases from the outer peripheral side to the inner peripheral side of the mask band (4).

As a result, the bonding strength of the bonding layer (3) covered by the mask band (4) gradually increases from the outer peripheral side to the inner peripheral side, and the front edge portion (61) of the metal frame (6) is increased. The bonding layer (3) covering the inner peripheral edge (62) has a sufficiently high bonding strength.
The front frame (63) of the metal frame (6) is constructed by combining four frame pieces (63a) (63b) (63c) (63d) with each other as shown in FIG. The rigidity is low.

  Here, in the use state shown in FIG. 1, external force (for example, the weight of the protection panel itself, etc.) in the front direction with respect to the protection panel (2), that is, the direction opposite to the image display panel (5). When an external force is applied, particularly a large force is applied to the front edge portion (61) of the lower frame piece (63b) shown in FIG. 3 in the front direction, but particularly the front edge portion (61) of the metal frame (6). Since the bonding layer (3) covering the inner peripheral edge (62) has a sufficiently high bonding strength, the front edge portion (61) is bent in the front direction as in the prior art, and the front edge portion (61) There is no gap between the image display panels (5).

  The bonding strength of the bonding layer (3) covered with the mask band (4) gradually decreases from the inner peripheral side toward the outer peripheral side, but the outer peripheral edge of the bonding layer (3). Even in the vicinity of the region, ultraviolet rays (7) can be transmitted, so that the minimum strength is ensured.

  In the image display device assembled in this way, the light transmittance of the inner region of the mask band (4) is relatively high, and therefore the front edge portion ((6)) of the metal frame (6) passes through the mask band (4). The vicinity of the inner peripheral edge (62) of 61) may be visibly visible to the viewer. However, since the light transmittance of the outer region of the mask band (4) is low, the metal frame (6) passes through the mask band (4). The front edge portion (61) of the metal frame (6) is not clearly visible to the viewer, so that there is no design problem that the front edge portion (61) of the metal frame (6) can be seen through as a whole.

  According to the image display device of one embodiment of the present invention, the mask band (4) is formed on the back surface of the protective panel (2) and is not exposed on the surface of the protective panel (2). There is no possibility that the strip (4) will peel off or the mask strip (4) will be damaged.

  Further, since the protective panel (2) is bonded to the image display surface (10) of the image display unit (1) via the bonding layer (3) made of an ultraviolet curable resin, it enters the protective panel (2). Reflection of outside light is suppressed, thereby improving contrast and improving visibility. Further, condensation on the image display surface (10) of the image display panel (5) and the back surface of the protection panel (2) is prevented.

  Each part configuration of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. For example, the pattern of the mask band (4) is not limited to the form in which the dot size and the stripe width are changed as shown in FIGS. 5 to 9, and the light transmission is achieved by changing the arrangement pitch (interval) of the dots and stripes. It is also possible to realize rate gradation.

  The width of the mask band (4) is not limited to the size that can cover the entire front edge portion (61) of the metal frame (6), but is visible to the viewer through the protective panel (2). The width dimension may cover only a partial region of the front edge portion (61).

  It is also possible to attach a frame-shaped bezel to the front surface of the protective panel (2) shown in FIG. In this case, even if the bezel is formed with a width dimension smaller than the width dimension W of the mask band (4), the front edge portion (61) of the metal frame (6) is caused by the light shielding effect of the mask band (4). Is not clearly visible to the viewer.

(1) Image display unit
(10) Image display surface
(2) Protection panel
(3) Bonding layer
(31) Photo-curing resin
(4) Mask belt
(5) Image display panel
(6) Metal frame
(61) Front edge
(62) Inner edge
(7) UV

Claims (7)

An image display panel;
A translucent protective panel covering the front surface of the image display panel;
A bonding layer formed by curing a photocurable resin, interposed between the image display panel and the protection panel,
The back surface of the protective panel is provided with a mask band formed in a frame shape so as to face the outer peripheral part of the image display surface of the image display panel, and the mask band gradually moves from the inner peripheral part side toward the outer peripheral part side. An image display device in which the light transmittance is low.   The image display device according to claim 1, wherein the mask band is formed of a black dot pattern or a stripe pattern. An image display unit having an image display surface;
A translucent protective panel disposed over the image display surface;
A photocurable resin is cured, and includes a bonding layer interposed between the image display unit and the protective panel.
An image display panel having the image display surface formed on the front surface;
A frame-shaped front edge portion that contacts the outer peripheral portion of the front surface of the image display panel, and a metal frame that holds the image display panel;
A mask band extending in a frame shape along the front edge portion of the metal frame is formed on the back surface of the protective panel, and the mask band is at least in the width direction perpendicular to the extending direction. The front edge portion has a width dimension W that can cover the inner peripheral edge on the image display surface side and the vicinity thereof, and gradually cures the photocurable resin along the width direction toward the image display surface side. An image display device in which the light transmittance is increased.   The image display device according to claim 3, wherein the mask band is formed of a black dot pattern, and the dot density gradually decreases toward the image display surface along the width direction thereof.   The image according to claim 3, wherein the mask band is formed by a black stripe pattern extending in the extending direction of the mask band, and the stripe density gradually decreases along the width direction toward the image display surface. Display device.   The image display device according to claim 3, wherein the mask band has a width dimension capable of covering the entire front edge portion of the metal frame.   7. The metal frame includes a front frame and a back frame, and the front frame is configured by combining four frame pieces with each other, and the front edge portion is formed on these frame pieces. An image display device according to any one of the above.

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