JP2010026022A - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display device capable of reliably preventing light leakage to a light guide plate opening constituting a non-display portion and improving the visibility of a back object.
A backlight device including at least a light guide plate 5 and a light source disposed opposite to a light introducing portion on an end surface of the light guide plate 5; and a liquid crystal display disposed on a light emitting surface side of the light guide plate 5 of the backlight device. A liquid crystal display device comprising a light shielding member 11 attached to the periphery of an opening 5a formed in the light guide plate 5, and the light shielding member 11 and the resin member 12 and an elastic material having high light shielding properties. The member 13 is integrally formed. Here, the resin member 12 is made of polycarbonate (PC), and the elastic member 13 is made of elastomer. The elastic member 13 is interposed between the resin member 12 and the inner peripheral surface of the opening 5 a of the light guide plate 5. Further, the light shielding member 11 is obtained by double molding of the resin member 12 and the elastic member 13.
[Selection] Figure 3

Description

  The present invention relates to a liquid crystal display device in which an opening is formed in a part of a light guide plate of a backlight device, and the opening is a non-display part, and more specifically, a light shielding structure around the periphery of the opening of the light guide plate It is about.

  BACKGROUND ART A liquid crystal display (LCD) is widely used as an image display device for a mobile phone, a personal computer, and the like, and includes a light guide plate and a light source disposed so as to face a light introduction portion at an end surface of the light guide plate. And a liquid crystal display disposed on the light emitting surface side of the light guide plate of the backlight device.

  By the way, in a slot machine that is a gaming machine, a spinning reel is disposed on the back side of the liquid crystal display device, and the periphery of the spinning reel is displayed on the liquid crystal display device and rotated via the liquid crystal display device. It is configured so that the movement and design of the body reel can be visually recognized. Specifically, an opening is formed in a part of the light guide plate of the backlight device to form a non-display portion, and the rotating reel faces the opening.

  In a liquid crystal display device such as a slot machine partially including a non-display portion as described above, when light leaks from the periphery of the opening portion of the light guide plate, the visibility of a rear object such as a spinning reel facing the opening portion is improved. There is a problem of getting worse.

  Therefore, Patent Document 1 proposes a configuration in which a slit groove that blocks light passage is formed in the back surface portion of the light guide plate so as to surround the opening, and a light shielding member is inserted into the slit groove.

  Conventionally, a light shielding structure as shown in FIGS. 7 and 8 has been adopted.

That is, FIG. 7 is a partial cross-sectional view showing a light shielding structure at the periphery of the non-display portion of the liquid crystal display device, and FIG. 8 is an enlarged detail view of an E portion of FIG. 7, and an opening 105 a is formed in the light guide plate 105 as shown. A light shielding member 111 is attached to the periphery of the opening 105a. A light diffusing portion 109 formed by laminating a plurality of sheets such as prism sheets is disposed on the light emitting surface side (upper surface side) of the light guide plate 105, and the liquid crystal display 103 is disposed above the diffusion portion 109. . A reflection sheet 110 is disposed on the light-emitting surface (lower surface) of the light guide plate 105.
JP 2005-185826 A

  By the way, the light shielding member 111 shown in Patent Document 1 and FIGS. 7 and 8 is made of a resin such as polycarbonate (PC) mixed with metal powder such as aluminum or a metal thin film, and its color looks good. From the viewpoint of improving the merchantability of the product, it is colored or colorless other than black. For this reason, the light shielding member 111 cannot perform complete light shielding, and light from the light guide plate 105 passes through the light shielding member 111 and leaks to the opening 105a side. Although this leaked light is used as auxiliary illumination for a back object such as a spinning reel facing the opening (non-display part) 105a, it is a factor that reduces the visibility of the back object.

  Further, in the conventional light shielding structure, as shown in detail in FIG. 8, since there is a gap δ between the liquid crystal display 103 and the upper edge of the light shielding member 111, the reflected light and the transmitted light are transmitted to the liquid crystal display. This occurs at the periphery of the black mask 106 of 103 and causes light leakage, which also contributes to lower visibility of the back object.

  The present invention has been made in view of the above problems, and a purpose of the invention is a liquid crystal that can reliably prevent light leakage to the opening of the light guide plate constituting the non-display portion and improve the visibility of the back object. It is to provide a display device.

  In order to achieve the above object, the invention according to claim 1 is a backlight device including at least a light guide plate and a light source disposed opposite to a light introducing portion on an end surface of the light guide plate, and light emission of the light guide plate of the backlight device. A liquid crystal display disposed on the surface side, wherein the light shielding member is attached to the periphery of the opening formed in the light guide plate, and the light shielding member is made of a resin member and a light shielding property. It is characterized by being integrally formed with a high elastic member.

  According to a second aspect of the present invention, in the first aspect of the invention, the resin member is made of polycarbonate (PC), and the elastic member is made of an elastomer.

  A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the elastic member is interposed between the resin member and the inner peripheral surface of the opening of the light guide plate.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the light shielding member is obtained by double molding of the resin member and the elastic member.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the edge of the elastic member protrudes toward the liquid crystal display side from the light emitting surface of the backlight device. And

  The invention according to claim 6 is the invention according to claim 5, wherein the cross-sectional shape of the edge of the elastic member is Y-shaped.

  According to a seventh aspect of the present invention, in the invention according to any one of the first to sixth aspects, the periphery of the opening of the light guide plate is formed by fitting the light shielding member between the elastic member and the inner peripheral surface of the opening of the light guide plate. It is characterized by being attached to.

  According to the first and second aspects of the present invention, the light shielding member attached to the periphery of the opening formed in the light guide plate of the backlight device is integrally formed as a two-layer structure with the resin member and the highly light-shielding elastic member. Therefore, the light from the light guide plate is completely shielded by the highly light-blocking elastic member, and light leakage to the opening of the light guide plate is reliably prevented and exposed to the opening constituting the non-display portion. Visibility of the background object to be improved.

  According to the invention described in claim 3, since the elastic member is interposed between the resin member and the inner peripheral surface of the opening of the light guide plate, the light from the light guide plate is first surely shielded by the elastic member having a high light shielding property. At the same time, the thermal expansion accompanying the heat generation of the light guide plate is absorbed by the elastic deformation of the elastic member, so that the stress accompanying the thermal expansion does not act on the light guide plate, and the durability of the light guide plate is enhanced.

  According to the fourth aspect of the present invention, the light shielding member can be easily manufactured by double molding of the resin member and the elastic member, and the manufacturing cost can be reduced.

  According to the fifth aspect of the present invention, since the edge of the elastic member protrudes to the liquid crystal display side from the light emitting surface of the backlight device, the liquid crystal display is covered from the light emitting surface side of the backlight device and assembled. Then, the edge of the elastic member is pressed by the liquid crystal display and is elastically deformed. For this reason, the edge of the elastic member is in close contact with the liquid crystal display, and no gap is formed between the light shielding member and the liquid crystal display. Reflected light and transmitted light leak from the gap, and the peripheral edge of the black mask of the liquid crystal display is covered. There is no light emission, thereby further improving the visibility of the back object.

  According to the sixth aspect of the present invention, since the cross-sectional shape of the end of the elastic member is Y-shaped (bifurcated), the end of the Y-shaped cross-section is easily elastically deformed and used as a seal lip. Close contact with. For this reason, generation | occurrence | production of the gap between a light shielding member and a liquid crystal display is prevented more reliably, and the leakage of the reflected light and transmitted light from a gap is prevented reliably.

  According to the seventh aspect of the present invention, since the light shielding member is attached to the periphery of the opening of the light guide plate by the concave and convex fitting between the elastic member and the inner peripheral surface of the opening of the light guide plate, the light shielding member is attached and detached. At this time, the elastic member is easily elastically deformed, so that the light shielding member can be easily attached to and detached from the light guide plate.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a plan view of a liquid crystal display device according to the present invention, FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG. 1, FIG. 3 is an enlarged detail view of a portion B in FIG. 5 is a plan view of the light shielding member, and FIG. 6 is an enlarged sectional view taken along the line DD of FIG.

A liquid crystal display device 1 shown in FIGS. 1 and 2 is used as an image display device of a slot machine as a gaming machine, and includes a liquid crystal display 3 incorporated in a rectangular frame 2 and the liquid crystal display device. The backlight device 4 is configured to illuminate the display 3 from the back.
As shown in FIG. 1, the liquid crystal display device 1 is partitioned into a rectangular non-display portion 1A that is long in the horizontal direction and a display portion (light emitting portion) 1B around it, and corresponds to the non-display portion 1A. The light guide plate 5 of the backlight device 4 has an opening 5 a having the same shape. Further, the portion corresponding to the non-display portion 1A of the liquid crystal display 3 (the portion facing the opening 5a of the light guide plate 5) constitutes a transparent window 3a, and the periphery of the transparent window 3a is shown in FIG. As shown in FIG. 3 and FIG. The non-display portion 1A is a portion where image display and light emission are not performed, and a drum-like shape that can rotate independently of each other is provided on the back side (lower surface side in FIG. 2) of the opening 5a formed in the light guide plate 5. Three spinning reels (not shown) are juxtaposed in the horizontal direction, and these spinning reels are exposed in the opening 5a of the light guide plate 5, and the player passes through the transparent window 3a of the liquid crystal display 3. The movement of the reel reel and the symbols displayed on it can be viewed from the outside.

  On the other hand, the display unit 1B of the liquid crystal display device 1 is a portion that is illuminated by the backlight device 4 and displays an image by the liquid crystal display 3. As shown in FIG. The peripheral edge is bordered by a black mask 7.

  By the way, the backlight device 4 is of a side view type that emits light in the lateral direction, and as shown in FIG. 2, the light guide plate 5 having a rectangular flat plate shape made of a transparent resin such as an acrylic resin, The light guide plate 5 includes upper and lower CCFL (cold cathode fluorescent lamp) light sources 8 disposed close to the light introducing portions on the upper and lower end surfaces of the light guide plate 5. As shown in FIG. 3, a light diffusing portion 9 formed by laminating a plurality of sheets such as prism sheets is disposed on the light emitting surface side (upper surface side) of the light guide plate 5, and the liquid crystal display is disposed thereon. A vessel 3 is provided. A reflection sheet 10 is disposed on the light-emitting surface (lower surface) of the light guide plate 5.

  Thus, as shown in FIG. 3, the light shielding member 11 is attached to the periphery of the opening 5 a formed in the light guide plate 5. As shown in FIG. 5, the light shielding member 11 is integrated with a resin member 12 formed into a rectangular frame shape by polycarbonate (PC) and an outer peripheral surface of a rectangular cylindrical portion 12 a erected integrally with the resin member 12. The elastic member 13 made of elastomer is integrally formed as a two-layer structure. In the present embodiment, the light shielding member 11 is manufactured by double molding of the resin member 12 and the elastic member 13. Also, the color of the resin member 12 is colored or colorless other than black from the viewpoint of enhancing the merchantability such as appearance, and the color of the elastic member 13 is black to enhance the light shielding property of the elastic member 13. in use.

  By the way, as shown in FIG. 6, the horizontal convex part 13a is integrally formed in the outer periphery of the elastic member 13 of the light-shielding member 11 over the perimeter, and as shown in FIG. A stepped recess 5b is formed around the entire periphery of the portion 5a.

  As shown in FIG. 6, the upper end edge of the elastic member 13 protrudes upward from the upper end edge of the resin member 12, and the light shielding member 11 is placed on the periphery of the opening 5a of the light guide plate 5 as shown in FIG. In the attached state, the upper end edge of the elastic member 12 protrudes above the light emitting surface of the backlight device 4 (on the liquid crystal display 3 side). And the upper end edge of the elastic member 13 is shape | molded in the forked shape so that a cross section may comprise Y shape, as shown in FIG.

  When the light guide plate 5 is fitted from above into the light shielding member 11 configured as described above, the outer periphery of the elastic member 13 of the light shielding member 11 is inserted into the recess 5b formed at the periphery of the opening 5a of the light guide plate 5. The projecting portion 13 a protruding from the fitting portion is fitted, whereby the light shielding member 11 is attached to the periphery of the opening portion 5 a of the light guide plate 5. At this time, since the elastic member 13 can be easily elastically deformed, the light shielding member 11 can be easily attached to the periphery of the opening 5a of the light guide plate 5, and the opening 5a of the light guide plate 5 can be easily attached. The light shielding member 11 already attached to the periphery can be easily removed, and the detachability is improved.

  In the state where the light shielding member 11 is attached to the periphery of the opening 5a of the light guide plate 5 in the manner described above, the elastic member 13 has the inner periphery of the resin member 11 and the opening 5a of the light guide plate 5 as shown in FIG. The upper end edge of the resin member 12 protrudes upward from the upper end edge of the resin member 12 and the light emitting surface of the backlight device 4 as described above.

  In the state where the liquid crystal display 3 is covered from the upper surface side of the backlight device 4 and pressed downward from the above state, the outer peripheral edges of both are fixed by the frame 2 and assembled and integrated, thereby the liquid crystal shown in FIG. Although the display device 1 is configured, since the upper end edge of the elastic member 13 protrudes upward from the upper end edge of the resin member 12 and the light emitting surface of the backlight device 4, the upper end edge of the elastic member 12 is moved by the liquid crystal display 3. When pressed, it is elastically deformed as shown in detail in FIG. For this reason, the upper end edge of the elastic member 13 is in close contact with the lower surface of the liquid crystal display 3, and no gap is generated between the light shielding member 11 and the liquid crystal display 3. As a result, the reflected light and the transmitted light are not leaked from the gap and the peripheral edge of the black mask 6 of the liquid crystal display 3 does not emit light, thereby further improving the visibility of a back object (not shown). In particular, in the present embodiment, since the cross-sectional shape of the upper end edge of the elastic member 13 is Y-shaped (bifurcated), the Y-shaped end edge easily elastically deforms to form a seal lip in the liquid crystal display 3. (See FIG. 4). For this reason, generation | occurrence | production of the gap between the light shielding member 11 and the liquid crystal display 3 is prevented more reliably, and leakage of the reflected light and transmitted light from a gap is prevented reliably.

  Thus, in the liquid crystal display device 1 according to the present invention, the luminous flux emitted upward and downward from the CCFL light source 8 arranged along the upper and lower sides of the long side of the light guide plate 5 of the backlight device 4 is guided. The light is introduced into the light guide plate 5 from the light introduction portions on the upper and lower end surfaces of the long side of the light plate 5, reflected by the reflection sheet 10, and emitted upward from the light irradiation surface (upper surface) side of the light guide plate 5, By being diffused through the diffusion unit 9, uniform illumination light is obtained, and the liquid crystal display 3 is illuminated from the back side.

  As described above, in the present embodiment, the light shielding member 11 attached to the periphery of the opening 5a formed in the light guide plate 5 of the backlight device 4 is composed of the resin member 12 and the elastic member 13 having a high light shielding property. Since the structure is integrated, the light from the light guide plate 5 is completely shielded by the highly light-blocking elastic member 13, and light leakage to the opening 5a of the light guide plate 5 is reliably prevented, and the non-display portion The visibility of the background object exposed to the opening part 5a which comprises 1A is improved. As described above, since the upper edge of the elastic member 13 is in close contact with the lower surface of the liquid crystal display 3, no gap is formed between the light shielding member 11 and the liquid crystal display 3, and reflected light and transmitted light leak from the gap. As a result, the peripheral edge of the black mask 6 of the liquid crystal display 3 is not caused to emit light, whereby the visibility of the back object is further enhanced. In addition, when the inner peripheral surface of the rectangular cylindrical portion 12a of the resin member 12 of the light shielding member 11 is mirror-finished, the image of the rotating reel is reflected on the inner peripheral surface. It is desirable to apply processing.

  In this embodiment, since the elastic member 13 of the light shielding member 11 is interposed between the resin member 12 and the inner peripheral surface of the opening 5a of the light guide plate 5, the light from the light guide plate 5 is first shielded. The light is reliably shielded by the high elastic member 13 and the thermal expansion accompanying the heat generation of the light guide plate 5 is absorbed by the elastic deformation of the elastic member 13 so that the stress accompanying the thermal expansion does not act on the light guide plate 5. The durability of 5 is enhanced.

  Furthermore, in this embodiment, the light shielding member 11 can be easily manufactured by double molding of the resin member 12 and the elastic member 13, and the manufacturing cost can be reduced.

  In the above description, the present invention is applied to a liquid crystal display device used as an image display device of a slot machine that is a gaming machine. However, the present invention exposes an analog meter in a non-display portion. Of course, the same effect as described above can be obtained by applying the same to other arbitrary liquid crystal display devices such as a vehicle meter. In the above embodiment, polycarbonate (PC) is used as the material of the resin member of the light shielding member, and elastomer is used as the material of the elastic member. However, these materials are only examples and are not limited. Any other material can be selected as long as the object of the present invention can be achieved.

1 is a plan view of a liquid crystal display device according to the present invention. It is an AA line expanded sectional view of FIG. It is the B section enlarged detail drawing of FIG. FIG. 4 is an enlarged detail view of a C part in FIG. 3. It is a top view of the light shielding member of the liquid crystal display device which concerns on this invention. FIG. 6 is an enlarged sectional view taken along line D-D in FIG. 5. It is a fragmentary sectional view which shows the conventional light-shielding structure of a liquid crystal display device. It is the E section enlarged detail drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 1A Non-display part of a liquid crystal display device 1B Display part (light emission part) of a liquid crystal display device
2 Frame 3 Liquid crystal display 3a Transparent window of liquid crystal display 4 Backlight device 5 Light guide plate 5a Opening portion of light guide plate 5b Recessed portion of light guide plate 6,7 Black mask 8 CCFL light source 9 Diffusing portion 10 Reflective sheet 11 Light shielding member 12 Resin Member 12a Rectangular tubular portion of resin member 13 Elastic member 13a Convex portion of elastic member

Claims (7)

A backlight device including at least a light guide plate and a light source disposed opposite to a light introducing portion on an end surface of the light guide plate, and a liquid crystal display disposed on a light emitting surface side of the light guide plate of the backlight device, In the liquid crystal display device configured by attaching a light shielding member to the periphery of the opening formed in the optical plate,
A liquid crystal display device, wherein the light shielding member is integrally formed of a resin member and an elastic member having a high light shielding property.   2. The liquid crystal display device according to claim 1, wherein the resin member is made of polycarbonate (PC), and the elastic member is made of elastomer.   The liquid crystal display device according to claim 1, wherein the elastic member is interposed between the resin member and an inner peripheral surface of the opening of the light guide plate.   The liquid crystal display device according to claim 1, wherein the light shielding member is obtained by double molding of the resin member and the elastic member.   5. The liquid crystal display device according to claim 1, wherein an edge of the elastic member protrudes toward the liquid crystal display from the light emitting surface of the backlight device.   The liquid crystal display device according to claim 5, wherein a cross-sectional shape of an edge of the elastic member is a Y-shape.   The liquid crystal display according to claim 1, wherein the light shielding member is attached to the periphery of the opening of the light guide plate by fitting an unevenness between the elastic member and the inner peripheral surface of the opening of the light guide plate. apparatus.

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