JP5119287B2 - Image display device - Google Patents

Description

  The present invention relates to an image display device on which a display screen for displaying an image is formed.

  FIG. 10 is a cross-sectional view of the rear illumination device 1 included in the image display device according to the first prior art. The rear illumination device 1 includes a sheet-like optical member 2, a lamp house 3, and a plurality of spacer pins 4. The plurality of spacer pins 4 are arranged on the inner bottom portion 5 of the lamp house 3 and prevent the central portion of the optical member 2 from being bent toward the inner bottom portion 5 side of the lamp house 3 (see, for example, Patent Document 1). The optical member 2 expands in the surface direction due to thermal expansion as the temperature rises. The linear expansion coefficient of the optical member 2 is larger than that of other members excluding the optical member 2.

  In the case where the frame portion 6 that is provided as a part of the lamp house 3 or connected to the lamp house 3 and that covers the optical member 2 outside the optical member 2 in the surface direction is sufficiently large, the optical member The extension amount of the optical member 2 when the thermal expansion occurs in 2 can be accommodated in the internal space of the frame portion 6.

  However, as the entire image display device is required to be downsized, an image display device having a large display screen is required. Therefore, it is desired that the frame portion 6 provided on the outer side in the surface direction of the display screen is small, and a narrow frame is required.

  FIG. 11 is a cross-sectional view of a liquid crystal display device 1A which is an image display device according to the second prior art. The liquid crystal display device 1A includes a lamp house 3A, a light diffusing plate 2A or a reinforcing plate, a surface sheet 2B, a liquid crystal panel 7, and a plurality of support columns 8. The plurality of support columns 8 are formed at the center portion of the light diffusion plate 2A or the reinforcing plate installed above the support column 8 and the position supporting the peripheral portion. Among the plurality of support columns 8, the height of the support columns 8a that support the central portion is configured to be higher than the height of the support columns 8b that are formed at positions that support the peripheral portion.

JP-A-10-326517 JP 2004-233828 A

  The first conventional technique has a problem in that it is not possible to allow the optical member 2 to stretch due to thermal expansion or the like in the technique for realizing a narrow frame.

  In the second prior art, it is possible to allow bending and regulate the bending direction, but there is a problem that the central portion of the light diffusion plate 2A or the reinforcing plate comes into contact with the liquid crystal panel.

  An object of the present invention is to provide an image display device capable of allowing the diffusion plate or the reinforcing plate to extend even when the size of the frame portion in the surface direction of the display screen is limited.

The present invention has a liquid crystal element, and a rectangular liquid crystal panel for displaying an image on one side by the liquid crystal element;
A chassis disposed on the other side of the liquid crystal panel;
Between the liquid crystal panel and the chassis, a diffusion plate or a reinforcing plate disposed substantially parallel to the liquid crystal panel,
Wherein the diffuser plate or other surface side of the reinforcement plate, and a said relative chassis set vignetting, protrusion protruding toward the diffuser plate or the reinforcing plate,
The protrusion is
A first projection member of several that are eccentrically disposed with respect to the liquid crystal panel,
Than said first protruding member, and a second protruding member is that multiple eccentrically disposed with largely to the liquid crystal panel,
A small allowable amount region in which the amount of displacement of the diffusion plate or the reinforcing plate toward the other surface side is regulated to a predetermined value or less by the first projecting member, and the amount of displacement of the diffusion plate or the reinforcing plate toward the other surface side Is formed by the diffusion plate or the reinforcing plate , the large allowable amount region that is regulated below the predetermined value larger than the predetermined value by the second projecting member ,
The plurality of first projecting members and the plurality of second projecting members are alternately provided in the chassis in at least one of a long side direction and a short side direction of the liquid crystal panel. An image display device characterized by the above.

  Further, the present invention is characterized in that the large tolerance region is formed at a different position away from the opposite side with respect to the center of the diffusion plate or the reinforcing plate.

Further, the present invention is characterized in that a plurality of the large allowable area and the small allowable area are formed in each of a long side direction and a short side direction of the liquid crystal panel.

  Further, the present invention is characterized in that the large allowable amount region is formed in an annular shape with respect to the center of the diffusion plate or the reinforcing plate.

  The present invention is characterized in that a notch is formed in a part of the small tolerance region or a part of the position close to the small tolerance region in the outer edge portion of the diffusion plate or the reinforcing plate. And

Convex The present invention, among the outer edges of the diffuser plate or reinforcement plate, the part of the position close to a part or the small allowance region of the small tolerance region, that protrudes in the surface direction outward Part is formed,
It further includes a spacer disposed between the convex portion and the liquid crystal panel.

  Further, the invention is characterized in that the minimum value of the thickness dimension of the diffusion plate or the reinforcing plate in the small tolerance region is set smaller than the thickness dimension of the diffusion plate or the reinforcement plate in the large tolerance region. To do.

The present invention, before Symbol large tolerance region is characterized by being formed alongside more in the short side direction of the liquid crystal panel.

According to the present invention, the projecting portion is to chassis set vignetting on the other surface side of the diffusing plate or reinforcement plate, projecting toward the diffusion plate or the reinforcing plate. The projecting portion has a plurality of first projecting members and a plurality of second projecting members, and forms a small tolerance region and a large tolerance region on the diffusion plate or the reinforcing plate. In the small allowable amount region, the amount of displacement of the diffusion plate or the reinforcing plate toward the other surface is restricted to a predetermined value or less by the first projecting member. In the large permissible amount region, the amount of displacement of the diffusion plate or the reinforcing plate toward the other side is restricted by the second projecting member to a predetermined value or less that is greater than the predetermined value. In the projecting portion, the plurality of first projecting members and the plurality of second projecting members are provided in the chassis so as to be alternately arranged in at least one of the long side direction and the short side direction of the liquid crystal panel. .

  Thereby, for example, when the diffusion plate or the reinforcing plate expands due to a temperature rise or the like, the diffusion plate or the reinforcing plate can be allowed to be displaced in the thickness direction in the large allowable amount region. Accordingly, it is possible to suppress the amount of advancement of the diffusion plate or the reinforcing plate that advances outward in the surface direction. In addition, the second projecting member and the first projecting member can control the amount of displacement in the thickness direction of the diffusion plate or the reinforcing plate at different positions in the plane direction. Therefore, even when the amount of advance of the diffusion plate or the reinforcing plate to the outside in the surface direction is limited to be small, the amount of displacement in the thickness direction due to the deflection of the diffusion plate or the reinforcing plate can be limited.

  Further, according to the present invention, the large tolerance region is formed at a different position away from the opposite side with respect to the center of the diffusion plate or the reinforcing plate. Thereby, in the diffusion plate or the reinforcing plate, it is possible to form a plurality of large tolerance regions that are separated in the surface direction. Therefore, the displacement amount of the diffusion plate or the reinforcing plate in the thickness direction can be allowed at a plurality of positions of the diffusion plate or the reinforcing plate. As a result, compared to the case where the large allowable amount region is formed at a single position, the amount of advancement of the diffusion plate or the reinforcing plate to advance outward in the surface direction can be suppressed, and the expansion of the diffusion plate or the reinforcing plate can be suppressed. Can be greatly tolerated. In addition, for a certain amount of expansion of the diffusion plate or the reinforcing plate, the amount of displacement in the thickness direction due to the deflection of the diffusion plate or the reinforcing plate should be smaller than when a large allowable area is formed at a single position. Can do.

Further, according to the present invention, a plurality of large tolerance areas and small tolerance areas are formed in each of the long side direction and the short side direction of the liquid crystal panel. Thereby, in any direction of the surface direction along the liquid crystal panel, the amount of diffusion of the diffusion plate or the reinforcing plate to the outside in the surface direction can be suppressed.

  According to the present invention, the large tolerance region is formed in an annular shape with respect to the center of the diffusion plate or the reinforcing plate. As a result, a plurality of large tolerance regions can be formed on any straight line passing through the center of the diffusion plate or the reinforcing plate and parallel to the surface direction. Therefore, compared with the case where a single large allowable area is formed in at least one of the surface directions, the amount of diffusion of the diffusion plate or the reinforcing plate outward in the surface direction is suppressed in all the surface directions. Is possible.

  According to the present invention, a notch is formed in a part of the small tolerance region or a part of the position close to the small tolerance region in the outer edge portion of the diffusion plate or the reinforcing plate. Thereby, the bending rigidity of the diffusion plate or the reinforcing plate in the vicinity of the notch can be reduced. Accordingly, it is possible to allow the diffusion plate or the reinforcing plate to be bent on a straight line passing through the notch. As a result, displacement in the thickness direction in other regions other than the vicinity of the notch can be allowed, so that displacement in the thickness direction in the large tolerance region can be made easier than in the small tolerance region. it can.

  Further, according to the present invention, the outer edge of the diffusion plate or the reinforcing plate has a convex portion protruding outward in the surface direction at a part of the small tolerance region or a part of the position close to the small tolerance region. It is formed. The image display device further includes a spacer, and the spacer is disposed between the convex portion and the liquid crystal panel. Thereby, it is possible to prevent the portion in the vicinity of the convex portion of the diffusion plate or the reinforcing plate from being displaced in the thickness direction. Accordingly, it is possible to position a portion of the diffusion plate or the reinforcing plate that is allowed to be displaced in the thickness direction and a portion that is restricted.

  According to the present invention, the minimum value of the thickness dimension of the diffusion plate or the reinforcement plate in the small tolerance region is set smaller than the thickness dimension of the diffusion plate or the reinforcement plate in the large tolerance region. Thereby, the bending rigidity of the diffusion plate or the reinforcing plate in the small allowable amount region can be reduced. Accordingly, since displacement in the thickness direction in other regions excluding the small tolerance region can be allowed, displacement in the thickness direction in the large tolerance region can be facilitated as compared to the small tolerance region. .

Further, according to the present invention, a plurality of large permissible areas are formed side by side in the short side direction of the liquid crystal panel. Thereby, even if the diffusion plate or the reinforcing plate expands, it is possible to reduce the amount of the diffusion plate or the reinforcing plate that moves outward in the surface direction in the long side direction. When the linear expansion coefficient of the diffusion plate or the reinforcing plate is the same, the elongation amount in the long side direction is larger than the elongation amount in the short side direction. Therefore, the maximum value of the amount of advance of the diffuser plate or the reinforcing plate outward in the surface direction can be reduced by reducing the amount of advance of the diffuser plate or the reinforcing plate outward in the surface direction in the long side direction.

1 is a cross-sectional view of an image display device 10 according to a first embodiment of the present invention. It is a figure showing the external shape and structure of the image display apparatus 10 which concern on 1st Embodiment of this invention. It is a figure showing the position of the diffusion plate etc. 16 in 1st Embodiment of this invention, and the 1st and 2nd protrusion members 18 and 19 with respect to this. It is a figure showing the position of the diffusion plate etc. 16 in 2nd Embodiment of this invention, and the 1st and 2nd protrusion members 18 and 19 with respect to this. It is a figure showing the position of the diffusion plate etc. 16 in 3rd Embodiment of this invention, and the 1st and 2nd protrusion members 18 and 19 with respect to this. It is a figure showing the position of the diffuser plate etc. 16 in 4th Embodiment of this invention, and the 1st and 2nd protrusion members 18 and 19 with respect to this. It is a figure showing the position of the diffusion plate etc. 16 in 5th Embodiment of this invention, and the 1st and 2nd protrusion members 18 and 19 with respect to this. It is a figure showing the position of the diffuser plate etc. 16 in 6th Embodiment of this invention, and the 1st and 2nd protrusion members 18 and 19 with respect to this. It is a figure showing the position of the diffusion plate etc. 16 in 7th Embodiment of this invention, and the 1st and 2nd protrusion members 18 and 19 with respect to this. It is sectional drawing of the back surface illuminating device 1 contained in the image display apparatus which concerns on a 1st prior art. It is sectional drawing of liquid crystal display device 1A which is an image display apparatus which concerns on a 2nd prior art.

  Hereinafter, a plurality of modes for carrying out the present invention will be described with reference to the drawings. In the description of the second and subsequent embodiments, overlapping descriptions may be omitted for portions corresponding to matters already described in the preceding embodiment. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding section. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination does not hinder. Moreover, each embodiment is illustrated in order to embody the technique which concerns on this invention, and does not limit the technical scope of this invention. The technical contents according to the present invention can be variously modified within the technical scope described in the claims.

(First embodiment)
FIG. 1 is a cross-sectional view of an image display apparatus 10 according to the first embodiment of the present invention. FIG. 2 is a diagram illustrating the outer shape and configuration of the image display apparatus 10 according to the first embodiment of the present invention. 2A is a front view of the image display device 10, FIG. 2B is a plan view of the image display device 10, and FIG. 2C is an exploded view of the image display device 10. FIG. It is a perspective view. In the image display device 10 according to the first embodiment, a display screen 11 for displaying an image is formed, and the image is displayed on the display screen 11. In the image display device 10, the frame portion 24 that surrounds the periphery of the liquid crystal panel 12 from the outside in the surface direction has a narrow frame.

  The image display device 10 is a liquid crystal display device that includes a liquid crystal panel 12, a chassis 13, a diffusion plate 16, and a protrusion 17. The liquid crystal panel 12 has a liquid crystal element, and is a panel for displaying an image on one side by the liquid crystal element. This one surface is a display screen, and the one surface side is the front surface side. The chassis 13 is arranged on many sides of the liquid crystal panel 12, that is, on the back side Z2. The diffusion plate 16 is disposed between the liquid crystal panel 12 and the chassis 13 so as to be substantially parallel to the liquid crystal panel 12. The protrusion 17 is provided on the back side Z2 of the diffusion plate 16 and is fixed to the chassis 13 and protrudes toward the diffusion plate 16. In FIG. 2C, the image display device 10 is illustrated with the protrusion 17 and the light source 30 omitted. A sheet-like component 16 disposed substantially in parallel with the liquid crystal panel 12 between the liquid crystal panel 12 and the chassis 13 is a diffusion plate or a reinforcing plate. Hereinafter, this is referred to as a “diffusion plate or the like” (16). Called. In the first embodiment, the diffusing plate 16 or the like is a sheet-like component that is formed in a sheet and integrally with one or a plurality of members.

  Further, the projecting portion 17 includes a first projecting member 18 and a second projecting member 19, and a small permissible region 21 and a large permissible region 22 are formed on the diffusion plate 16 or the like. In the small allowable amount region 21, the amount of displacement of the diffusion plate 16 or the like 16 toward the back side Z <b> 2 is restricted to a predetermined value or less by the first protruding member 18. In the large allowable amount region 22, the amount of displacement of the diffusing plate or the like 16 toward the back side Z <b> 2 is restricted by the second projecting member 19 to be equal to or less than a predetermined value larger than the predetermined value.

  At least the second projecting member 19 of the projecting portion 17 is provided apart from the diffusion plate 16 at room temperature, and the projecting portion 17 is obtained when the temperature of the diffusion plate 16 is higher than the ordinary temperature. The amount of displacement of the diffusing plate or the like 16 toward the back side Z2 is regulated. The large tolerance region 22 is formed at a different position away from the center of the diffusion plate 16 or the like on the opposite side. The large allowable amount region 22 and the small allowable amount region 21 include a first direction X that is predetermined among the surface directions along the liquid crystal panel 12 and a second direction Y that intersects the first direction X among the surface directions along the liquid crystal panel 12. And a plurality of them are formed. In FIG. 2, the first direction X is illustrated as the vertical direction of the surface direction, and the second direction Y is illustrated as the horizontal direction of the surface direction.

  In the first embodiment, the image display device 10 is a device that displays an image on the display screen 11 by outputting image information in a television or a personal computer. The display screen 11 is formed by a liquid crystal panel 12 having liquid crystal elements, and the liquid crystal panel 12 is formed in a flat plate shape. In the liquid crystal panel 12, two directions in the thickness direction Z are defined as a front side Z1 and a back side Z2. The image display device 10 displays the image so as to be visible when viewed from the front side Z1. In the image display device 10, the term “front side” (Z 1) and “rear side” (Z 2) are used for the flat parts arranged in parallel with the liquid crystal panel 12. Used to mean the same orientation.

  The image display device 10 includes a frame portion 24. The frame portion 24 forms a part of a housing that accommodates the diffusion plate 16, the chassis 13, and the protruding portion 17. Although the housing may be integrally formed as a whole including the frame portion 24, in the first embodiment, the housing includes the frame portion 24 and a back side member 26 that forms the housing together with the frame portion 24. Have. The frame portion 24 is disposed so as to extend outward in the surface direction of the liquid crystal panel 12 as viewed from the front side Z1, and defines the internal space with the frame portion 24 material alone or together with the back side member 26. In FIG. 1, the image display device 10 is illustrated with the back side member 26 omitted. When the image display device 10 is viewed from the front side Z1, the frame portion 24 and the liquid crystal panel 12 are formed in a rectangular shape. In a normal posture when the image display device 10 displays an image, the rectangle may be placed vertically or horizontally, but is placed horizontally in the first embodiment.

  The outer edge portion of the liquid crystal panel 12 is accommodated in the inner space of the frame portion 24 over the entire rectangular outer edge portion. The frame portion 24 has a pair of long side portions that form a long side of a rectangle and a pair of short side portions that form a short side. The long side direction and the short side direction in the rectangle formed by the frame portion 24 are parallel to the surface direction of the liquid crystal panel 12 and are perpendicular to each other. The shape, material and size of the long side portion and the short side portion are uniformly formed in the long side direction and the short side direction, respectively. Although the dimension in the short side direction of the long side part, that is, the width dimension of the long side part and the dimension in the long side direction of the short side part, that is, the width dimension of the short side part may be formed in mutually different dimensions, In 1st Embodiment, it forms in the same dimension.

  The liquid crystal panel 12 and the diffusing plate 16 and the like are arranged in parallel to each other, are formed in a rectangular shape when viewed in the thickness direction Z, and are arranged such that the long side directions thereof coincide with the long side direction of the frame portion 24. Therefore, the liquid crystal panel 12 and the diffusing plate 16 are arranged with their short side directions aligned with the short side direction of the frame portion 24. When viewed in the thickness direction Z, the diffuser plate 16 or the like is arranged on the back side Z2 with respect to the liquid crystal panel 12 so that the center thereof coincides with the center point when the liquid crystal panel 12 is viewed in the thickness direction Z.

  A spacer 27 is provided between the outer peripheral portion in the surface direction of the liquid crystal panel 12 and the outer peripheral portion in the surface direction of the diffusion plate 16 or the like. The spacer 27 relatively positions the liquid crystal panel 12 and the diffusion plate 16 in a state where they are separated by a predetermined distance in the thickness direction Z. The spacer 27 is disposed in contact with the entire outer edge of the liquid crystal panel 12 in the surface direction. The spacer 27 may be disposed in contact with a part of the outer peripheral edge portion of the diffuser plate 16 or the like, but in the first embodiment, the spacer 27 contacts the entire outer peripheral edge portion of the diffuser plate 16 or the like. Arranged. Although the size of the image forming apparatus is not limited, in the first embodiment, the image display apparatus 10 is a liquid crystal display apparatus in which the diagonal line of the liquid crystal panel 12 is 60 inches and the aspect ratio is 9:16. In this case, the distance between the liquid crystal panel 12 and the diffusion plate 16 is set to, for example, 5 mm or more and 10 mm or less by the spacer 27.

  The image display device 10 further includes a light source 30, and the light source 30 is disposed on the back side Z <b> 2 with respect to the diffuser plate 16 and the like. A plurality of light sources 30 are arranged and project light from the back side Z2 onto the liquid crystal panel 12 via the diffusion plate 16 or the like. The light emitted from the light source 30 is diffused in the plane direction by the diffusion plate 16 and the like, and the light transmitted through the diffusion plate 16 is applied to the liquid crystal panel 12, so that illumination necessary for image display is applied to the liquid crystal panel 12. Supplied. The diffusion plate may be referred to as a light guide plate or a light diffusion plate. Even if there is a difference in the distance from each light source 30 to each part of the liquid crystal panel 12 by arranging the diffusion plate 16 or the like, the luminance at each part of the liquid crystal panel 12 varies depending on the distance from the light source 30. There is nothing. Accordingly, the diffuser plate 16 can prevent the brightness in the liquid crystal panel 12 from being uneven.

  The diffuser plate 16 is formed of a material that is uniform in at least the surface direction. Further, the diffusion plate 16 may be formed of a uniform material as a whole. However, in the first embodiment, the diffusion plate 16 has a plurality of layers (16a, 16b, 16c). The plurality of layers constituting the diffuser plate 16 and the like are made of substantially the same material for the linear expansion coefficient, and the difference in the linear expansion coefficient is ignored with respect to the difference in the linear expansion coefficient of other members such as the frame portion 24. it can.

  The plurality of light sources 30 are attached to the chassis 13, and the chassis 13 is positioned and fixed with respect to the liquid crystal panel 12. Thus, the plurality of light sources 30 are fixed and arranged with respect to the liquid crystal panel 12. Although the chassis 13 may be formed integrally with the back side member 26, in the first embodiment, the chassis 13 is attached to the back side member 26 and holds the protruding portion 17 and the plurality of light sources 30. The chassis 13 positions and holds at least the projecting portion 17 with respect to the liquid crystal panel 12, the diffusion plate 16 and the like, the frame portion 24, and the rear side member 26, and also holds a plurality of light sources 30 in the first embodiment. To do.

  As long as these are possible, the chassis 13 may have any shape, for example, may be formed in a flat plate shape. In the first embodiment, the chassis 13 is formed in a rod shape extending in the long side direction. 1 or a plurality of long side direction bar-shaped members 28 and one or a plurality of short side direction bar-shaped members 29 extending in the short side direction and formed in a bar shape. The protrusion 17 and the plurality of light sources 30 are attached to at least one of the long-side direction bar-shaped member 28 and the short-side direction bar-shaped member 29. The long side direction bar-shaped member 28 and the short side direction bar-shaped member 29 are fixed to each other by, for example, a screw member. The chassis 13 including these is attached to the back side member 26 by, for example, a screw member.

  In this manner, the liquid crystal panel 12, the diffusion plate 16 and the like, the frame portion 24, the back side member 26, the spacer 27, the chassis 13, the protruding portion 17, and the plurality of light sources 30 are integrally formed. Hereinafter, these may be referred to as “display device body” (33). The liquid crystal panel 12 has the thickness direction Z substantially horizontal in a normal posture when the image display device 10 displays an image. In other words, the display device main body 33 sets the surface direction of the liquid crystal panel 12 to be substantially vertical. Substantially horizontal includes horizontal, and substantially vertical includes vertical. Further, the display device main body 33 may be formed so as to be tiltable within a predetermined angle range.

  The image display device 10 further includes a leg portion 34 that supports the display device body 33. The legs 34 are formed on the assumption that they are placed on a horizontal placement surface such as a floor surface. The leg 34 may be formed fixed to the display device main body 33. However, in the first embodiment, the leg 34 is attached to the display device main body 33 within a range in which the display device main body 33 can be supported. On the other hand, it is formed to be angularly displaceable. This angular displacement can be an angular displacement around a vertical axis, or an angular displacement around a horizontal axis.

  The image display device 10 is used at room temperature, and the temperature range of the usage environment assumed by the image display device 10 is set in advance to a temperature range that is assumed to be frequently used in the living environment of the user. . Hereinafter, this temperature range is referred to as “environment temperature”. The environmental temperature is determined based on the room temperature in the room where the user lives, and the image display device 10 and each component included in the image display device 10 are designed and manufactured based on the environmental temperature.

  The image display apparatus 10 operates using electric power as a driving force when electric power is supplied from the outside. The image display device 10 receives a signal representing image information and displays an image based on the input image information. The input image information may be configured such that the brightness, contrast, hue, etc. can be finely adjusted. When the image display device 10 is operated, the gas and the temperature of each member in the internal space defined by the back side Z2, the frame portion 24, and the back side member 26 are higher than those of the liquid crystal panel 12. The image display device 10 is formed using any one or more materials of resin, metal, wood, and the like.

In the display device body 33, the linear expansion coefficient with respect to the temperature rise of the diffusion plate 16 or the like is larger than the linear expansion coefficients of the liquid crystal panel 12, the spacer 27, and the chassis 13. The diffusion plate 16 is made of resin, and the linear expansion coefficient of the diffusion plate 16 is, for example, 70 ppm / ° C. (PPM: parts pers.
million). On the other hand, when a metal is used for the frame part 24, the linear expansion coefficient of the frame part 24 is 11-12 ppm / ° C.

  Moreover, since the light emitted from the light source 30 is directly irradiated to the diffuser plate 16 or the like, the temperature is likely to rise as compared with other components in the display device main body 33. Accordingly, with the operation of the image display device 10, the temperature of the diffusion plate 16 increases and the diffusion plate 16 is stretched. The amount of elongation generated in the diffuser plate 16 is greater than the amount of elongation generated in other members during operation.

  For example, in the case of the 60-inch image display device 10, the image display area of the liquid crystal panel 12 is approximately 133 cm in the long side direction and approximately 75 cm in the short side direction. At normal temperature, the gap between the diffuser plate 16 and the frame portion 24 in the internal space of the frame portion 24 is set to zero mm in both the long side direction and the short side direction. In the case of the 60-inch image display device 10, the dimension in the long side direction of the diffusion plate 16 or the like shows an elongation amount of 4.7 mm with a temperature difference of 50 ° C. With a temperature difference of 50 degrees, the frame portion 24 is elongated by 0.8 mm in the longitudinal direction. Therefore, the diffusing plate 16 or the like has an excess elongation of 3.9 mm with respect to the frame portion 24. If the diffusing plate 16 is bent in an arc in the thickness direction Z due to this excessive elongation, the maximum displacement amount in the thickness direction Z due to the bending is 45 mm.

  When the image display device 10 is operated, the temperature of the gas and each member rises earlier on the back side Z2 than on the front side Z1 relative to the diffusion plate 16 or the like. Accordingly, the thermal expansion of the diffusion plate or the like 16 occurs first on the back side Z2, and the diffusion plate or the like 16 is convexly bent on the back side Z2.

  In the first embodiment, by forming the large tolerance region 22 and the small tolerance region 21 on the diffusion plate 16 or the like, the diffusion plate 16 is allowed to be bent into a waveform, and the surface direction of the diffusion plate 16 or the like Allow elongation of. Among the areas formed on the diffusion plate 16 or the like, the types of the large allowable area 22 and the small allowable area 21 are defined by the protrusions 17. The protrusion 17 is fixed to the chassis 13 and includes a plurality of rod-shaped members. Each rod-shaped member is provided so as to protrude from the chassis 13 to the front surface side Z1 in the thickness direction, and is classified into two types with respect to their length, that is, the dimension in the thickness direction Z. Of the two types of rod-shaped members having different lengths, the long rod-shaped member is referred to as a “first protruding member” (18), and the short rod-shaped member is referred to as a “second protruding member” (19).

  In the first embodiment, the distance between the light source 30 and the diffusion plate 16 is 40 mm, the length of the first projecting member 18 is 42 mm, and the length of the second projecting member 19 is 37 mm. The difference between the length of the second projecting member 19 and the length of the first projecting member 18 is determined corresponding to the maximum value of the deflection in the thickness direction Z in a range where the deflection of the diffuser plate 16 or the like does not cause a harmful effect in image display. Is done. In the first embodiment, the length of the second projecting member 19 is 88% of the length of the first projecting member 18. Each protruding member is realized by, for example, polycarbonate set to a high reflectance. In the first embodiment, the diameter is set to 2 to 3 mm, and the color is transparent. The 1st protrusion member 18 is formed in the length of the grade which contacts the diffusion plate 16 etc. at normal temperature.

  When the diffusion plate 16 is viewed in the thickness direction Z, the region closer to the second projecting member 19 than the first projecting member 18 is referred to as a “large tolerance region” (22). The area close to the one projecting member 18 is referred to as a “small allowable area” (21). Since the small allowable amount region 21 is close to the first protruding member 18 having a long length, when the diffusion plate 16 is expanded and bent, the displacement amount in the thickness direction Z of the small allowable amount region 21 is Limited by one protruding member 18. On the other hand, since the large allowable amount region 22 is close to the second projecting portion having a short length, the displacement amount of the large allowable amount region 22 in the thickness direction Z when the diffusion plate 16 is expanded and bent. Is allowed by the second projecting member 19.

  At normal temperature, the distance between the surface on the back side Z2 of the diffusion plate 16 and the front side Z1 end of the first projecting member 18 is a predetermined value as the displacement amount of the diffusion plate 16 in the small tolerance region 21. , Zero mm, or any value between zero mm and 20 mm. At normal temperature, the distance between the surface on the back side Z2 of the diffuser plate 16 and the front side Z1 end of the second projecting member 19 is set to a predetermined value as the displacement amount of the diffuser plate 16 in the large tolerance region 22. The This is a predetermined value larger than a predetermined value in the small allowable amount region 21. This predetermined value may be 5 mm, for example, or may be set to any value between 0 mm and 25 mm.

  FIG. 3 is a diagram showing the positions of the diffusion plate 16 and the first and second projecting members 18 and 19 relative to the diffusion plate 16 in the first embodiment of the present invention. FIG. 3 is a diagram in which the diffusion direction is viewed in the thickness direction Z. The position of the first projecting member 18 is represented by a triangular mark, and the position of the second projecting member 19 is represented by a circle.

  In the first embodiment, the first protruding member 18 and the second protruding member 19 are arranged side by side in a first direction X parallel to the surface direction and a second direction Y parallel to the surface direction and intersecting the first direction X. Is done. In the first embodiment, the first direction X is the short side direction, and the second direction Y is the long side direction. Therefore, the first direction X and the second direction Y are orthogonal. The plurality of rod-shaped members constituting the projecting portion 17 are arranged in a plurality of rows in both the first direction X and the second direction Y, and the first projecting member 18 and the second projecting member 19 are viewed in the thickness direction Z. Are arranged at positions forming lattice points. The first and second projecting members 18 and 19 forming a row in the first and second directions X and Y are alternately arranged in any row in the first direction X or the second direction Y.

  As a result, the large allowable area 22 formed in the diffuser plate 16 and the like is formed at a plurality of positions different in the surface direction across the small allowable area 21 in both the first direction X and the second direction Y. . Therefore, the amount of displacement in the thickness direction Z can be reduced with respect to the same amount of elongation compared to the case where the first direction X or the second direction Y is bent as a single convex shape as a whole. Thereby, even if the amount of advance to the outside in the plane direction is suppressed, it is possible to suppress the deterioration of the image quality due to the extension of the diffusion plate 16 or the like. In other words, the amount of elongation allowed for the diffusion plate 16 can be increased.

  According to the first embodiment, the protruding portion 17 is provided on the rear side Z <b> 2 with respect to the chassis 13 rather than the diffusion plate 16 and protrudes toward the diffusion plate 16. Further, the projecting portion 17 includes a first projecting member 18 and a second projecting member 19, and a small permissible region 21 and a large permissible region 22 are formed on the diffusion plate 16 or the like. In the small allowable amount region 21, the amount of displacement of the diffusion plate 16 or the like 16 toward the back side Z <b> 2 is restricted to a predetermined value or less by the first protruding member 18. In the large allowable amount region 22, the amount of displacement of the diffusing plate or the like 16 toward the back side Z <b> 2 is restricted by the second projecting member 19 to be equal to or less than a predetermined value larger than the predetermined value.

  As a result, for example, when the diffuser plate 16 expands due to a temperature rise or the like, the displacement of the diffuser plate 16 in the thickness direction Z can be allowed in the large allowable amount region 22. Therefore, it is possible to suppress the amount of advancement of the diffusion plate 16 or the like that advances outward in the surface direction. The second projecting member 19 and the first projecting member 18 can control the amount of displacement of the diffuser plate 16 in the thickness direction Z at different positions in the plane direction. Therefore, even when the amount of advance of the diffuser plate 16 outward in the surface direction is limited to be small, the amount of displacement in the thickness direction Z due to the deflection of the diffuser plate 16 can be limited.

  With respect to the diffuser plate 16 at room temperature, it is parallel to the surface direction of the diffuser plate 16 and is located outside the rectangle from the position included in the rectangular plane when the diffuser plate 16 is viewed in the thickness direction Z. The direction going beyond the rectangular outline is referred to as “outward in the surface direction”.

  Further, according to the first embodiment, at least the second projecting member 19 of the projecting portion 17 is provided to be separated from the diffusion plate 16 at room temperature, and the temperature of the diffusion plate 16 is normal temperature at the projecting portion 17. The amount of displacement of the diffusing plate or the like 16 toward the back side Z2 when the temperature becomes higher than the upper limit is regulated. Thus, the maximum amount of displacement can be limited while allowing the diffusion plate 16 or the like to be displaced toward the back side Z2. Therefore, it is possible to prevent the function of the diffusion plate 16 or the like from being damaged by the bending due to the temperature rise.

  Further, according to the first embodiment, the large permissible amount region 22 is formed at a different position away from the opposite side with respect to the center of the diffusion plate 16 or the like. As a result, a plurality of large tolerance regions 22 that are separated in the surface direction can be formed in the diffusion plate 16 or the like. Therefore, the displacement amount of the diffusion plate 16 in the thickness direction Z can be allowed at a plurality of positions of the diffusion plate 16. As a result, compared to the case where the large allowable amount region 22 is formed at a single position, the advancing amount of the diffuser plate 16 that advances outward in the plane direction can be suppressed, and the expansion of the diffuser plate 16 or the like can be suppressed. Large tolerance is possible. Further, for a certain amount of expansion of the diffuser plate 16 or the like, the amount of displacement in the thickness direction Z due to the deflection of the diffuser plate 16 or the like is reduced as compared with the case where the large allowable region 22 is formed at a single position. Can do.

  Further, according to the first embodiment, the large allowable amount region 22 and the small allowable amount region 21 are the first direction X determined in advance among the surface directions along the liquid crystal panel 12 and the first among the surface directions along the liquid crystal panel 12. In the second direction Y that intersects the direction X, a plurality of each are formed. Thereby, in any direction of the surface direction along the liquid crystal panel 12, the amount of advance of the diffuser plate 16 or the like outward in the surface direction can be suppressed.

  For example, when the 60-inch image display device 10 according to the comparative example is a liquid crystal display device having a narrowed frame like the first embodiment, and the diffusion plate 16 or the like is entirely convex in the thickness direction Z, When the temperature rises by 20 ° C., the thermal expansion and the amount of elongation of the diffusion plate 16 and the like increase, and the uniformity of image quality and brightness appears. In the image display device 10, the larger the image display area, the greater the influence on the image quality of the image due to the thermal expansion of the diffusion plate 16 and the expansion in the surface direction.

(Second Embodiment)
FIG. 4 is a diagram showing the positions of the diffusion plate 16 and the first and second projecting members 18 and 19 relative to the diffusion plate 16 in the second embodiment of the present invention. In FIG. 4, as in FIG. 3, the position of the first projecting member 18 is represented by a triangular mark, and the position of the second projecting member 19 is represented by a round mark. The image display device 10 according to the second embodiment is similar to the image display device 10 according to the first embodiment, and hereinafter, description will be made focusing on differences between the second embodiment and the first embodiment.

  In the second embodiment, the large tolerance region 22 is formed in an annular shape with respect to the center of the diffusion plate 16 or the like. Specifically, both the large tolerance region 22 and the small tolerance region 21 are formed in an annular shape with respect to the center when the diffusion plate 16 is viewed in the thickness direction Z. When the plurality of rod-shaped members forming the projecting portion 17 are viewed in the thickness direction Z, the position of each first projecting member 18 or the second projecting member 19 and the position of the same type of rod-shaped member closest to the position The line connecting the lines draws the outline of the ellipse 36.

  The long axis direction of the ellipse 36 coincides with the long side direction of the liquid crystal panel 12 and the diffusion plate 16 and the like, and the short axis direction of the ellipse 36 coincides with the short side direction. Although the ratio of the major axis length to the minor axis length of the ellipse 36 may be determined regardless of the aspect ratio of the display area of the screen, in the second embodiment, the ratio of the aspect ratio of the display area of the screen. Set to the same ratio as. That is, the length of the major axis and the length of the minor axis of the ellipse 36 are determined to be 16 to 9, and if each ellipse 36 is virtually enlarged with the center of the diffuser plate 16 as a base point, both are diffuser plates or the like. It is inscribed with respect to the rectangle that forms the 16 outer edges.

  As for each rod-like member of the projecting portion 17, the line connecting the closest neighboring rod-like members is from the center position when the diffusion plate 16 is viewed in the thickness direction Z toward the outside in the plane direction. The curves connecting the first projecting members 18 and the curves connecting the second projecting members 19 are alternately arranged. Furthermore, it is preferable that the rod-shaped member located closest to the surface direction from each rod-shaped member is the same type as each rod-shaped member.

  According to the second embodiment, the large allowable amount region 22 is formed in an annular shape with respect to the center of the diffusion plate 16 or the like, and therefore, a plurality of areas on any straight line passing through the center of the diffusion plate 16 or the like and parallel to the surface direction. A large tolerance region 22 can be formed. Therefore, compared with the case where a single large allowable amount region 22 is formed in at least one of the surface directions, the amount of diffusion of the diffusion plate 16 or the like outward in the surface direction is suppressed in all the directions of the surface direction. Is possible.

(Third embodiment)
FIG. 5 is a diagram showing the positions of the diffusion plate 16 and the first and second projecting members 18 and 19 relative to the diffusion plate 16 in the third embodiment of the present invention. In FIG. 5, as in FIG. 3, the position of the first projecting member 18 is represented by a triangular mark, and the position of the second projecting member 19 is represented by a round mark. The image display device 10 according to the third embodiment is similar to the image display device 10 according to the first embodiment, and hereinafter, description will be made focusing on differences between the third embodiment and the first embodiment.

  In the third embodiment, a notch 38 is formed in a part of the small allowable amount region 21 or a part of the position close to the small allowable amount region 21 in the outer edge portion of the diffusion plate 16 or the like. Among the small tolerance regions 21 formed on the diffuser plate 16 or the like, the small tolerance region 21 formed including the outer edge portion or close to the outer edge portion is larger than the large tolerance region 22 adjacent thereto. Thus, this is a region where displacement to the back side Z2 is suppressed. On the other hand, since the displacement of the adjacent large tolerance region 22 to the back side Z2 is allowed as compared with the small tolerance region 21, the small tolerance region 21 is a portion bent compared to the other regions. Become. “Bend” means that the diffusing plate or the like 16 is bent within a recoverable range without impairing the function, and the radius of curvature at the bent portion is not limited within this range.

  In the third embodiment, the diffusion plate 16 or the like is substantially rectangular. Although the exact shape of the diffuser plate 16 is not rectangular due to the formation of the notch 38, the rectangle when the shape of the diffuser plate 16 is approximately approximate to a rectangle is hereinafter referred to as a “virtual rectangle”. Called. The notch 38 is a position where a straight line connecting the first projecting member 18 provided close to the outer edge of the diffuser plate 16 and the like and the first projecting member 18 closest to the first projecting member 18 intersects the contour of the virtual rectangle. Formed. The first projecting members 18 are arranged side by side in the short side direction, thereby forming a small tolerance region 21 extending in the short side direction.

  With respect to the diffuser plate 16 at room temperature, the rectangle or virtual rectangle is parallel to the surface direction of the diffuser plate 16 and is included in the rectangular or virtual rectangle plane when the diffuser plate 16 is viewed in the thickness direction Z. A direction toward the outer position beyond the outline of the rectangle or virtual rectangle is referred to as “outward in the plane direction”. Although the shape of the notch 38 is not particularly defined, it is preferably formed in a shape defined by a smooth curve. In the third embodiment, the notch 38 is formed in a semicircular shape that becomes a concave portion inward in the surface direction. If the shape of the notch 38 is formed in a shape where two straight lines intersect, stress concentration may occur. On the other hand, the stress concentration can be prevented from occurring by forming the shape of the notch 38 as a smooth curve.

  In the diffusing plate 16 or the like, each small permissible region 21 is formed from one outer edge portion in the short side direction to the other outer edge portion in the short side direction, and is arranged in a plurality in the long side direction. FIG. 5 illustrates a case where each small allowable amount region 21 is formed by three first projecting members 18 arranged in the short side direction, and two small allowable amount regions 21 are formed side by side in the longitudinal direction. ing. In the longitudinal direction, large tolerance areas 22 and small tolerance areas 21 are alternately arranged, and the plurality of small tolerance areas 21 are separated by a large tolerance area 22 arranged therebetween. Yes. Also, a large tolerance region 22 is formed in the vicinity of both ends in the longitudinal direction of the diffusion plate 16 or the like.

  The notches 38 are formed in the outer edge portion of the diffuser plate 16 or the like at the positions where the lines connecting the positions of the plurality of first projecting members 18 and the virtual rectangles intersect in each small allowable amount region 21, thereby The diffusing plate 16 can be easily bent by using the line connecting the positions of the first projecting members 18 as ridge lines. Therefore, it is possible to easily displace the large allowable amount regions 22 formed on both sides of the small allowable amount region 21 so as to protrude toward the back side Z2.

  In the third embodiment, the diffusion plate 16 is formed of a uniform material as a whole, and therefore the Young's modulus of the diffusion plate 16 is uniform. A notch 38 is formed in a part of the small tolerance region 21 or a part of the position close to the small tolerance region 21 in the outer edge portion of the diffuser plate 16 or the like, so that the surface direction passes through the notch 38. It is possible to reduce the moment of inertia of the cross section of the diffuser plate 16 or the like when a bending moment having a line parallel to the edge as a ridgeline is applied. As a result, the bending stiffness having a line passing through the notch 38 and parallel to the surface direction as a ridge line can be reduced, and the diffuser plate 16 can be easily bent at this portion. Accordingly, the displacement in the thickness direction Z in other regions except the vicinity of the notch 38 can be allowed, so that the displacement in the thickness direction Z in the large allowable amount region 22 is smaller than that in the small allowable amount region 21. Can be easily.

(Fourth embodiment)
FIG. 6 is a diagram showing the positions of the diffuser plate 16 and the first and second projecting members 18 and 19 relative to the diffuser plate 16 according to the fourth embodiment of the present invention. In FIG. 6, as in FIG. 3, the position of the first projecting member 18 is represented by a triangular mark, and the position of the second projecting member 19 is represented by a round mark. The image display device 10 according to the fourth embodiment is similar to the image display device 10 according to the first embodiment, and hereinafter, description will be made focusing on differences between the fourth embodiment and the first embodiment.

  In 4th Embodiment, the convex part 39 which protrudes to a surface direction outward is a part of small marginal capacity | capacitance area | region 21 or a part close | similar to the small marginal capacity | capacitance area | region 21 among outer edge parts, such as a diffusion plate. It is formed. The image display device 10 includes a spacer 27, and the spacer 27 is disposed between the convex portion 39 and the liquid crystal panel 12. The diffuser plate 16 is substantially rectangular. Although the exact shape of the diffuser plate 16 is not rectangular due to the formation of the convex portions 39, the rectangle when the shape of the diffuser plate 16 is approximately approximate to a rectangle is the same as in the third embodiment. Are referred to as “virtual rectangles”.

  The convex portion 39 is sandwiched between the spacer 27 and the member constituting the frame portion 24. Although the diffusion plate 16 may be fixed to the frame portion 24 by this clamping, in the fourth embodiment, a fixing through hole 42 is formed in the convex portion 39 so as to penetrate in the thickness direction Z. The through-holes 42 are formed one by one on each convex portion 39, and an engaging convex portion is formed on a member that forms the frame portion 24 corresponding to these through-holes 42. The engaging convex portion formed on the frame portion 24 protrudes to the front side Z1 in the thickness direction, is inserted into the through hole 42 of the convex portion 39 of the diffuser plate 16 or the like, and is disposed in contact with the spacer 27. Thereby, the diffuser plate 16 is fixed to the frame portion 24 and the spacer 27 by engaging the convex portion 39 with the engaging convex portion of the frame portion 24.

  The convex portion 39 of the diffuser plate 16 or the like is engaged with the engaging convex portion, or is not engaged with the engaging convex portion and is sandwiched between the member forming the frame portion 24 and the spacer 27. However, the displacement in the thickness direction Z is prevented. That is, the diffuser plate 16 is prevented from being displaced in the thickness direction Z at the convex portion 39 and its vicinity in the same manner as the displacement of the small allowable region 21 is restricted by the first projecting member 18. In the fourth embodiment, the plurality of rod-like members of the projecting portion 17 can be arranged in the same manner as in the third embodiment shown in FIG. 5, and in this case, the same effect as in the third embodiment is achieved. be able to.

  In 4th Embodiment, the several rod-shaped member of the protrusion part 17 is arrange | positioned similarly to 1st Embodiment shown in FIG. In this case, a plurality of, more specifically, two small tolerance regions 21 are arranged in the long side direction on the outer edge portion of the diffusion plate or the like 16 forming the long side of the virtual rectangle, and the diffusion plate or the like 16 is arranged in the vicinity thereof. A convex portion 39 is formed. In the short side direction, one small tolerance region 21 is formed, and a convex portion 39 is formed in the vicinity thereof. In other embodiments, a plurality of small tolerance regions 21 and convex portions 39 may be formed also in the short side direction.

  Thereby, it is possible to prevent the portion near the convex portion 39 of the diffusion plate 16 from being displaced in the thickness direction Z. Therefore, it is possible to position the part of the diffusion plate 16 that is allowed to be displaced in the thickness direction Z and the part that is restricted.

(Fifth embodiment)
FIG. 7 is a diagram showing the positions of the diffusion plate 16 and the first and second projecting members 18 and 19 relative to the diffusion plate 16 according to the fifth embodiment of the present invention. In FIG. 7, as in FIG. 3, the position of the first projecting member 18 is represented by a triangular mark, and the position of the second projecting member 19 is represented by a circle. The image display apparatus 10 according to the fifth embodiment is similar to the image display apparatus 10 according to the first embodiment, and hereinafter, the description will be focused on differences between the fifth embodiment and the first embodiment.

  In the fifth embodiment, the minimum value of the thickness dimension of the diffusion plate 16 in the small tolerance region 21 is set smaller than the thickness dimension of the diffusion plate 16 in the large tolerance region 22. Specifically, in the diffusion plate 16 or the like, a recess 46 is formed from the back side Z2 according to the position and shape of the small allowable amount region 21. The plurality of rod-like members of the projecting portion 17 in the fifth embodiment are arranged in the same manner as in the third embodiment shown in FIG. Since each small tolerance region 21 extends along the short side direction, the recess 46 is also formed as a groove 47 along the short side direction.

  The cross-sectional shape obtained by cutting the portion where the groove 47 is formed by a virtual plane parallel to the thickness direction Z may be a part of a rectangle, a part of a rhombus, or a part of a circle. Form as part of a circle. If a shape in which two straight lines intersect is formed in a contour shape of a cross section perpendicular to the longitudinal direction of the groove 47 in a portion where the groove 47 is formed, stress concentration may occur. On the other hand, stress concentration can be prevented from occurring by forming the contour shape of the cross section perpendicular to the longitudinal direction of the groove 47 at the portion where the groove 47 is formed as a part of the circle.

  By setting the minimum value of the thickness dimension of the small allowance area 21 to be smaller than the thickness dimension of the diffusion plate 16 or the like in the large allowance area 22, the cross-sectional secondary moment can be reduced in the small allowance area 21. . Therefore, the bending rigidity of the diffusion plate 16 or the like in the small allowable amount region 21 can be reduced. Accordingly, since displacement in the thickness direction Z in other regions except the small allowable amount region 21 can be allowed, displacement in the thickness direction Z in the large allowable amount region 22 is easier than in the small allowable amount region 21. Can be.

(Sixth embodiment)
FIG. 8 is a diagram showing the positions of the diffuser plate 16 and the first and second projecting members 18 and 19 relative to the diffuser plate 16 in the sixth embodiment of the present invention. In FIG. 8, as in FIG. 3, the position of the first projecting member 18 is represented by a triangular mark, and the position of the second projecting member 19 is represented by a circle. The image display apparatus 10 according to the sixth embodiment is similar to the image display apparatus 10 according to the first embodiment, and hereinafter, the description will be focused on differences between the sixth embodiment and the first embodiment.

  In the sixth embodiment, the liquid crystal panel 12 is formed in a rectangular shape, and a plurality of large allowable amount regions 22 are formed side by side in the short side direction of the liquid crystal panel 12. Outer edge portions 49 located near both ends in the short side direction of diffusion plate 16 and the like are formed to extend in the long side direction, and outer edge portions located near both ends in the long side direction are formed to extend in the short side direction. . Out of these outer edge portions, the outer edge portion 49 in the vicinity of both ends in the short side direction formed extending in the long side direction is sandwiched between the member forming the frame portion 24 and the spacer 27. In FIG. 8, the outer edge portion 49 near both ends in the short side direction is indicated by hatching.

  The outer edge portion 49 near both ends in the short side direction formed extending in the long side direction is sandwiched between the member forming the frame portion 24 and the spacer 27, thereby preventing the displacement of this portion in the thickness direction Z. can do. In the diffusing plate 16 or the like, for example, when a part of the center part is stretched, for example, the part that is bent due to the stretch is easily expanded to the outer edge part 49 near both ends in the short side direction. . In such a case, the region allowing the diffusion plate 16 or the like to extend is a narrower region in the short side direction than in the long side direction, and thus a plurality of large allowable amount regions 22 are formed in the short side direction. Thus, it is possible to allow the elongation in the short side direction efficiently.

(Seventh embodiment)
FIG. 9 is a diagram showing the positions of the diffusion plate 16 and the first and second projecting members 18 and 19 with respect to the diffusion plate 16 in the seventh embodiment of the present invention. In FIG. 9, as in FIG. 3, the position of the first projecting member 18 is represented by a triangular mark, and the position of the second projecting member 19 is represented by a circle. The image display device 10 according to the seventh embodiment is similar to the image display device 10 according to the first embodiment, and hereinafter, description will be made focusing on differences between the seventh embodiment and the first embodiment.

  In the seventh embodiment, the liquid crystal panel 12 is formed in a rectangular shape, and a plurality of large allowable amount regions 22 are formed side by side in the long side direction of the liquid crystal panel 12. Outer edge portions of the outer edge portion of the diffuser plate 16 and the like that extend in the short side direction and are located near both ends in the long side direction are sandwiched between the member forming the frame portion 24 and the spacer 27. In FIG. 9, the outer edge portion 50 in the vicinity of both ends in the long side direction is indicated by hatching.

  By forming a plurality of large permissible region 22 side by side in the long side direction, even if the diffusing plate 16 expands, the advancing amount of the diffusing plate 16 outward in the plane direction in the long side direction can be reduced. it can. When the linear expansion coefficient of the diffuser plate 16 or the like is the same, the elongation amount in the long side direction is larger than the elongation amount in the short side direction. Therefore, by reducing the amount of advance of the diffuser plate 16 or the like 16 outward in the surface direction in the long side direction, the maximum value of the amount of advance of the diffuser plate or the like 16 outward in the surface direction can be reduced.

In the first to seventh embodiments, the image display apparatus 10 is an image display apparatus 10 used for a television or a personal computer. However, the image display apparatus 10 can be extended outward in the plane direction by the extension of the diffusion plate 16 or the like. It is sufficient if the device has a characteristic and the extension of the diffusion plate or the like 16 outward in the surface direction is regulated by the frame portion 24 arranged around the diffusion plate or the like 16. For example, in another embodiment, a mobile phone, a personal digital assistant (personal digital
assistance, abbreviated “PDA”), a tablet-type electronic device, a digital display watch, and the like.

  Further, in the first to seventh embodiments, the light source 30 projects light from the back side Z2 rather than the diffusion plate 16 or the like, but for example, from a side surface facing outward in the surface direction of the diffusion plate or the like 16 in a mobile phone or the like. A configuration in which light is incident on the diffuser plate 16 or the like may be used.

  In the first to seventh embodiments, the liquid crystal panel 12 and the diffusing plate 16 have a flat plate shape, but may be slightly curved in other embodiments.

DESCRIPTION OF SYMBOLS 10 Image display apparatus 12 Liquid crystal panel 13 Chassis 16 Diffuser etc. 17 Protrusion part 18 1st protrusion member 19 2nd protrusion member 21 Small tolerance area 22 Large tolerance area 24 Frame part 26 Back side member 27 Spacer 30 Light source

Claims (8)

A rectangular liquid crystal panel having a liquid crystal element and displaying an image on one side by the liquid crystal element;
A chassis disposed on the other side of the liquid crystal panel;
Between the liquid crystal panel and the chassis, a diffusion plate or a reinforcing plate disposed substantially parallel to the liquid crystal panel,
Wherein the diffuser plate or other surface side of the reinforcement plate, and a said relative chassis set vignetting, protrusion protruding toward the diffuser plate or the reinforcing plate,
The protrusion is
A first projection member of several that are eccentrically disposed with respect to the liquid crystal panel,
Than said first protruding member, and a second protruding member is that multiple eccentrically disposed with largely to the liquid crystal panel,
A small allowable amount region in which the amount of displacement of the diffusion plate or the reinforcing plate toward the other surface side is regulated to a predetermined value or less by the first protruding member, and the amount of displacement of the diffusion plate or the reinforcing plate toward the other surface side Is formed by the diffusion plate or the reinforcing plate , the large allowable amount region that is regulated below the predetermined value larger than the predetermined value by the second projecting member ,
The plurality of first projecting members and the plurality of second projecting members are alternately provided in the chassis in at least one of a long side direction and a short side direction of the liquid crystal panel. An image display device characterized by the above. It said large tolerance region, the image display device according to be formed at separate different positions on the opposite side to 請 Motomeko 1 you wherein with respect to the center of the diffusing plate or the reinforcing plate. 3. The image display device according to claim 1, wherein a plurality of the large allowable area and the small allowable area are formed in each of a long side direction and a short side direction of the liquid crystal panel. It said large tolerance region, the image display apparatus according to any one of claims 1-3, characterized in that it is formed in an annular with respect to the center of the diffusing plate or the reinforcing plate. 2. A notch is formed in a part of the small permissible region or a part of a position close to the small permissible region in an outer edge portion of the diffusion plate or the reinforcing plate. the image display apparatus according to any one of 1-4. Of the outer edge of the diffuser plate or reinforcement plate, the part of the position close to a part or the small allowance region of the small tolerance region, the convex portion that protrudes in the plane outward are formed,
The image display apparatus according to any one of claims 1-5, characterized in that it further comprises a spacer disposed between the liquid crystal panel and the convex portion. The minimum value of the thickness dimension of the diffusion plate or the reinforcing plate in the small tolerance region is set smaller than the thickness dimension of the diffusion plate or the reinforcement plate in the large tolerance region. 6. The image display device according to any one of 6 . Before SL large tolerance region, the image display apparatus according to any one of claims 1-7, characterized in that formed alongside more in the short side direction of the liquid crystal panel.

Images