JP2007157450A - Diffusing plate supporting member, backlight device, and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diffusing plate supporting member which can prevent an occurrence of a contact noise when contacting with a diffusing plate, and a backlight device and a display device using the above member. <P>SOLUTION: The diffusing plate supporting member which supports a diffusing plate 15 diffusing a light from a cold cathode tube (a light source) includes a base part 22a fixed on a case housing the cold cathode tube and a pillar part 22b which extends from the base part 22a to a side of the diffusing plate 15 and of which the top part 22c contacts with the diffusing plate 15. Furthermore, the top part 22c of the pillar part 22b includes a shock absorbing material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a diffusion plate support member that supports a diffusion plate, a backlight device using the diffusion plate support member, and a display device.

  In recent years, for example, liquid crystal display devices have been widely used in liquid crystal televisions, monitors, mobile phones, and the like as flat panel displays having features such as thinness and light weight compared to conventional cathode ray tubes. Such a liquid crystal display device includes a backlight device that emits light, and a liquid crystal panel that displays a desired image by acting as a shutter for light from a light source provided in the backlight device. Yes.

  The backlight device is roughly classified into a direct type and an edge light type depending on the arrangement of the light source with respect to the liquid crystal panel. However, in the liquid crystal display device having a liquid crystal panel of 20 inches or more, it is more than the edge light type. A direct-type backlight device that is easy to achieve high brightness and large size is generally used. That is, the direct type backlight device is configured by arranging a plurality of linear light sources on the back side (non-display surface) side of the liquid crystal panel, and the linear light source can be arranged immediately behind the liquid crystal panel. A large number of linear light sources can be used, and it is easy to obtain high luminance and is suitable for high luminance and large size. Further, the direct type backlight device is suitable for high luminance and large size because the inside of the device has a hollow structure and is light even if it is large.

Further, in the direct type backlight device as described above, a cold-cathode tube is usually provided on the light-emitting surface opposed to the liquid crystal panel by installing a diffusion plate above the cold-cathode tube as the linear light source. The flat surface light emitted from the light emitting surface to the liquid crystal panel has a uniform luminance while preventing the appearance of a shadow (lamp image). Further, in direct type backlight devices, it has been proposed to support a diffusion plate by a diffusion plate support member in order to prevent the occurrence of bending due to its own weight or warpage of the diffusion plate made of synthetic resin or glass material. (For example, refer to Patent Documents 1 and 2 below.)
JP 2004-327449 A JP 2004-186080 A

  By the way, the diffusion plate support member as described above is locked to a housing that accommodates the cold cathode tube in order to appropriately support the diffusion plate. On the other hand, the diffusion plate is installed in a movable state with respect to the casing. In other words, in the backlight device as described above, plastic deformation may occur in the diffusion plate due to heat from the cold cathode fluorescent lamp or a temperature increase inside the casing accompanying this. For this reason, in the backlight device, for example, by fixing only one side of the four sides of the diffusion plate, the diffusion plate is movably provided to allow the plastic deformation in the diffusion plate.

  However, since the diffuser plate is movably installed as described above, in the conventional diffuser plate support member, when the diffuser plate moves (vibrates), the vibration noise caused by periodically contacting the diffuser plate, A contact sound such as a sliding contact sound caused by sliding of the diffusion plate on the diffusion plate support member may occur. In particular, when a sound accompanying a display image is generated from a sound generating device such as a speaker installed in the vicinity of the liquid crystal panel as well as displaying an image on the liquid crystal panel as in a liquid crystal display device, the diffusion plate is In some cases, the contact sound with the diffusing plate support member increases due to vibration in response to vibration generated by the sound generator.

  In view of the above-described problems, an object of the present invention is to provide a diffusion plate support member that can prevent generation of contact sound due to contact with the diffusion plate, a backlight device using the diffusion plate support member, and a display device. And

In order to achieve the above object, a diffusion plate support member according to the present invention is a diffusion plate support member that supports a diffusion plate that diffuses light from a light source, and
A cushioning material is provided at a portion in contact with or close to the diffusion plate.

  In the diffusion plate support member configured as described above, since the buffer material is provided in a portion in contact with or close to the diffusion plate, even when the diffusion plate vibrates, the buffer material contacts the diffusion plate. It is possible to prevent the generation of contact sounds such as vibration sounds and sliding contact sounds.

Further, in the diffusion plate support member, a base fixed to a housing that houses the light source;
A column portion extending from the base to the diffusion plate side and having a tip portion in contact with or close to the diffusion plate,
The front end portion of the support column may be configured using a cushioning material.

  In this case, generation of the contact sound due to contact with the diffuser plate can be prevented by the tip portion configured using the buffer material.

Further, in the diffusion plate support member, a base fixed to a housing that houses the light source;
A strut extending from the base to the diffusion plate side,
The tip portion of the support column may be in contact with or close to the diffusion plate with a buffer member using a buffer material interposed.

  In this case, the occurrence of the contact sound due to the contact with the diffusion plate can be prevented by the buffer member interposed between the tip portion of the support column and the diffusion plate.

  In the diffusing plate support member, a reflector that is provided between the two light sources and reflects light from the two light sources may be used for the base.

  In this case, the diffuser plate support member can support the diffuser plate in a stable state while further improving the light utilization efficiency of the two light sources by the reflector.

  In the diffusing plate support member, it is preferable that the base is provided with a locking portion that is locked to the casing in a state of protruding to the outside of the casing.

  In this case, since the locking portion is directly fixed to the housing, the installation of a dedicated fixing member for fixing the diffusion plate supporting member to the housing can be omitted.

  In the diffusing plate supporting member, it is preferable that the surface of the base portion has a color with high light reflectance.

  In this case, the light from the light source can be reflected toward the diffusion plate by the surface of the base, and the light utilization efficiency can be improved.

  In the diffusion plate support member, the buffer material may be a transparent material.

  In this case, since the buffer material is made of a transparent material, the buffer material can be incident on the diffusion plate without blocking the light of the light source, and it is possible to prevent the light utilization efficiency from being lowered. .

Further, the backlight device of the present invention is a backlight device comprising a light source and a diffusion plate for diffusing light from the light source,
The diffusion plate is supported by using any one of the diffusion plate support members described above.

  In the backlight device configured as described above, a diffusion plate support member that prevents generation of contact sound due to contact with the diffusion plate is used, so even when the diffusion plate vibrates, It is possible to prevent the user from feeling uncomfortable due to the contact sound.

The display device of the present invention is a display device comprising a light source, a diffusion plate that diffuses light from the light source, and a display unit that is irradiated with light from the light source through the diffusion plate. ,
The diffusion plate is supported by using any one of the diffusion plate support members described above.

  In the display device configured as described above, a diffusion plate support member that prevents generation of contact sound due to contact with the diffusion plate is used. Therefore, even when the diffusion plate vibrates, the display device does not include the contact. It is possible to prevent the user from feeling uncomfortable due to sound.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the diffusion plate support member which can prevent that the contact sound by contact with a diffusion plate generate | occur | produces, a backlight apparatus using this, and a display apparatus.

  Hereinafter, preferred embodiments of a diffusion plate support member, a backlight device, and a display device of the present invention will be described with reference to the drawings. In the following description, the case where the present invention is applied to a liquid crystal display device including a direct type backlight device will be described as an example.

[First Embodiment]
FIG. 1 is a schematic cross-sectional view for explaining a display device according to a first embodiment of the present invention. In FIG. 1, a liquid crystal display device 1 according to the present embodiment includes a liquid crystal panel 2 as a display unit in which the upper side of the figure is set as the viewing side (display side), and the non-display side of the liquid crystal panel 2 (lower side of the figure). And a direct-type backlight device 3 that generates illumination light for illuminating the liquid crystal panel 2.

  The liquid crystal panel 2 includes a liquid crystal layer 4, a pair of transparent substrates 5 and 6 that sandwich the liquid crystal layer 4, and polarizing plates 7 and 8 provided on the outer surfaces of the transparent substrates 5 and 6, respectively. Yes. The liquid crystal panel 2 is provided with a driver 9 for driving the liquid crystal panel 2 and a drive circuit 10 connected to the driver 9 via the flexible printed circuit board 11. 4 can be driven pixel by pixel. In the liquid crystal panel 2, the polarization state of the illumination light incident through the polarizing plate 7 is modulated by the liquid crystal layer 4 and the amount of light passing through the polarizing plate 8 is controlled, so that a desired image is displayed. Is done.

  The backlight device 3 is provided with a bottomed case 12 opened on the upper side (liquid crystal panel 2 side) in the figure, and a frame-like frame 13 installed on the liquid crystal panel 2 side of the case 12. Further, the case 12 and the frame 13 are made of metal or synthetic resin, and are held by the bezel 14 having an L-shaped cross section in a state where the liquid crystal panel 2 is installed above the frame 13. The backlight device 3 is assembled to the liquid crystal panel 2 and integrated as the liquid crystal display device 1.

  The backlight device 3 is provided on the inner surface of the case 12, the diffusion plate 15 installed so as to cover the opening of the case 12, the optical sheet 17 installed on the liquid crystal panel 2 side above the diffusion plate 15. The reflection sheet 19 is provided. The backlight device 3 includes a plurality of, for example, a plurality of light sources that are held in the case 12 above the reflection sheet 19 by the light source holder 21 and arranged at predetermined intervals in the left-right direction in FIG. Six cold cathode tubes 20 as linear light sources are provided.

  The diffusion plate 15 is made of, for example, a rectangular synthetic resin or glass material having a thickness of about 2 mm, and diffuses light from the cold cathode tube 20 (including light reflected by the reflection sheet 19). Then, the light is emitted to the optical sheet 17 side. Further, the diffusion plate 15 is placed on a frame-like surface provided on the upper side of the case 12 on its four sides, and the surface of the case 12 and the frame 13 are interposed with an elastically deformable pressing member 16 interposed therebetween. It is incorporated in the backlight device 3 while being held between the inner surface and the inner surface. Further, the diffusion plate 15 is supported by the diffusion plate support member 22 of the present invention, and is prevented from being bent inside the case 12 as a housing for housing the cold cathode tube 20.

  Further, the diffusion plate 15 is held so as to be movable between the case 12 and the pressing member 16, and the diffusion plate 15 is affected by heat such as the heat generation of the cold cathode tube 20 and the temperature rise inside the case 12. Even when expansion (plastic) deformation occurs, the pressing member 16 is elastically deformed to absorb the plastic deformation, so that the diffusibility of light from the cold cathode tube 20 is not reduced as much as possible. Further, the use of the diffusion plate 15 made of a glass material that is more resistant to heat than the synthetic resin is preferable in that warpage, yellowing, thermal deformation, and the like due to the influence of the heat are less likely to occur.

The optical sheet 17 includes, for example, a condensing sheet and a diffusion sheet made of a synthetic resin film having a thickness of about 0.1 to 0.5 mm, and increases the luminance of the illumination light to the liquid crystal panel 2. Or the display quality on the display surface of the liquid crystal panel 2 is improved. Further, the optical sheet 17 is appropriately laminated with a known optical sheet material such as a prism sheet or a polarizing sheet for improving display performance such as an improvement in viewing angle on the display surface of the liquid crystal panel 2 as necessary. It has come to be. Then, the optical sheet 17 converts the light emitted from the diffusion plate 15 into planar light having a predetermined luminance (for example, 250 cd / m ² ) or more and uniform luminance, and uses the liquid crystal panel 2 as illumination light. It is comprised so that it may radiate | emit to the side.

  Further, in the optical sheet 17, for example, a protruding portion that protrudes to the left in FIG. 1 is formed in the central portion on the left end side in FIG. 1 that is on the upper side when the liquid crystal display device 1 is actually used. In the optical sheet 17, only the protruding portion is sandwiched between the inner surface of the frame 13 and the pressing member 16 with the elastic material 18 interposed therebetween. The optical sheet 17 can be expanded and contracted inside the backlight device 3. It is built in the state. As a result, the optical sheet 17 can be freely stretched and deformed based on the protruding portion even when stretch (plastic) deformation occurs due to the influence of the heat such as the heat generation of the cold cathode tube 20. And bending of the optical sheet 17 are prevented as much as possible. As a result, in the liquid crystal display device 1, it is possible to prevent the display quality of the liquid crystal panel 2 from being deteriorated as much as possible due to the bending of the optical sheet 17 or the like on the display surface of the liquid crystal panel 2.

  The reflection sheet 19 is made of a synthetic resin film having a thickness of about 0.1 to 2.0 mm, for example, and functions as a reflection plate that reflects light from the cold cathode fluorescent lamp 20 toward the diffusion plate 15. ing. Further, the surface of the reflective sheet 19 on the cold cathode tube 20 side is painted white, for example, and the light emitted from the cold cathode tube 20 is efficiently reflected to the diffuser plate 15 side to efficiently use the light and the diffuser plate. The brightness at 15 is increased. In addition to this description, the reflection sheet 19 may be composed of a metal thin film having a high light reflectance such as aluminum or silver.

  Each cold-cathode tube 20 is of a straight-tube fluorescent lamp type, and electrode portions (not shown) provided at both ends thereof are supported outside the case 12. In addition, each cold cathode tube 20 is a tube having a diameter of about 3.0 to 4.0 mm and excellent in luminous efficiency.

  With reference to FIG. 2 as well, for example, two light source holders 21 are attached to each cold cathode tube 20 along the longitudinal direction of the cold cathode tube 20 (left and right direction in FIG. 2). The tube 20 is supported. Thereby, the cold cathode tube 20 is supported inside the case 12 with the distance between the diffusion plate 15 and the reflection sheet 19 being kept at a predetermined distance. The light source holder 21 is made of, for example, a transparent and flexible PC (polycarbonate) resin, and the cold cathode tube 20 is prevented while preventing a partial decrease in luminance due to the light source holder 21 as much as possible. Can be held in a stable state.

  As illustrated in FIG. 2, the backlight device 3 is provided with four diffusion plate support members 22, and is configured to support the diffusion plate 15 from the inside of the case 12. Further, these four diffusion plate support members 22 are arranged at point-symmetrical positions with respect to the center of the diffusion plate 15 so that the diffusion plate 15 can be supported in a balanced manner.

  Referring also to FIG. 3, each diffusion plate support member 22 includes a flat plate-like base portion 22 a fixed to the case 12, and extends from the base portion 22 a toward the diffusion plate 15, and a distal end portion 22 c has a diffusion plate. 15 and a substantially conical column portion 22 b that contacts the 15. As shown in FIG. 3, the front end portion 22 c of the column portion 22 b is formed in an arc shape in cross section, and can support the diffusion plate 15 without damaging the surface of the diffusion plate 15.

  The base portion 22a includes a substantially cylindrical locking portion 22d provided so as to protrude from the surface opposite to the surface on which the support column portion 22b is extended. In the diffusing plate support member 22, the locking portion 22 d is inserted into the through holes formed in the reflection sheet 19 and the case 12, and protrudes to the outside of the case 12. The diffusing plate support member 22 is assembled to the backlight device 3 by the tip formed on the outer surface of the case 12 being locked.

  Further, in each diffusion plate support member 22, the tip end portion 22c is configured separately from the column portion 22b, and can be attached to and detached from the column portion 22b.

  Specifically, in each diffusion plate support member 22, the base portion 22a (including the locking portion 22d) and the support column portion 22b are configured using a transparent material, for example, a PC resin. The column portion 22b is integrally formed by an injection molding method or the like. Moreover, the surface arrange | positioned at the case 12 inside side of the base 22a is colored with high light reflectance colors, such as white, milky white, or silver. Thereby, in the diffusing plate support member 22, the light of the cold cathode fluorescent lamp 20 can be reflected to the diffusing plate 15 side by the base 22a, and the light utilization efficiency can be improved. Further, since the light from the cold cathode tube 20 can be prevented from entering the inside of the base portion 22a, the occurrence of leaked light that leaks from the base portion 22a to the outside of the case 12 through the locking portion 22d is prevented. It is possible to prevent the light utilization efficiency from being reduced due to leakage light.

  In addition, the support 22b maintains the transparency of the PC resin so that light from the cold-cathode tube 20 can enter and can be emitted to the diffusion plate 15 side.

  On the other hand, the tip portion 22c is made of a transparent and buffering material, for example, urethane resin, and as shown in FIG. 3, the lower end side of the tip portion 22c is provided at the upper end portion of the column portion 22b. By being press-fitted into the hole, the tip portion 22c can be attached to and detached from the column portion 22b. Further, since the tip portion 22c is made of a transparent material, it can be incident on the diffusion plate 15 without blocking the light of the cold cathode tube 20, and directly from the cold cathode tube 20. The incident light and the light incident through the support column 22 b can be incident on the diffuser plate 15. Thereby, in the diffuser plate support member 22, it is possible to prevent the amount of light incident on the diffuser plate 15 from being partially lowered at the contact point with the diffuser plate 15, and the diffuser plate 15 and the diffuser are diffused on the light emitting surface. Luminance unevenness such as black unevenness can be prevented from appearing in the portion directly above the contact portion with the tip portion of the plate support member 22.

  In the present embodiment configured as described above, the diffusion plate support member 22 includes a base portion 22a that is fixed to the case (housing), and a support column portion 22b that extends from the base portion 22a to the diffusion plate 15 side. Yes. Further, a cushioning material is used for the tip portion 22c of the support 22b that contacts the diffusion plate 15. Therefore, in the present embodiment, unlike the conventional example, the buffer material is provided at the contact portion of the diffusion plate support member 22 with the diffusion plate 15, so even when the diffusion plate 15 vibrates, the tip portion (buffer material) 22 c. Thus, the vibration of the diffusion plate 15 can be buffered. As a result, it is possible to prevent generation of contact sounds such as vibration sound and sliding contact sound due to contact between the diffusion plate 15 and the diffusion plate support member 22.

  Further, in the present embodiment, since the generation of the contact sound can be prevented, in the backlight device 3 and the liquid crystal display device 1, even when the diffusion plate 15 vibrates, the user feels uncomfortable feeling due to the contact sound. It is possible to prevent being given.

  In addition to the above description, a diffusion plate support member 22 in which the light source holder 21 is integrally formed can be used. That is, the light source holder 21 and the diffusion plate are integrally connected to the base 22a of the diffusion plate support member 22 and the light source holder 21 disposed in the vicinity of the base 22a on the lower side of the cold cathode tube 20. What integrated the support member 22 can be used. When such an integrated device is used, the light source holder 21 and the diffusion plate support member 22 can be assembled to the backlight device 3 at the same time, and the assembly man-hours of the backlight device 3 and the liquid crystal display device 1 can be reduced. This is preferable in that it can be reduced and configured at low cost.

  In addition to the above description, the diffusion plate support member 22 can be assembled to the backlight device 3 using a fixing member such as a pin. However, in the case where the locking portion 22d is provided and the diffusion plate support member 22 is assembled to the backlight device 3 as described above, the installation of the fixing member can be omitted, and the increase in the number of parts can be reduced. In addition, it is preferable in that the work of assembling the diffusion plate support member 22 can be simplified and the cost of the backlight device 3 and the liquid crystal display device 1 can be easily reduced.

[Second Embodiment]
FIG. 4 is a schematic cross-sectional view for explaining a display device according to a second embodiment of the present invention. In the figure, the main difference between the present embodiment and the first embodiment is that in the diffusion plate support member, the tip end portion of the support column is in contact with the diffusion plate with a buffer member using a buffer material interposed. It is a point. In addition, about the element which is common in the said 1st Embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

  That is, as shown in FIG. 4, in this embodiment, the buffer member 25 is provided on the distal end portion (upper end) side of the diffusion plate support member 24, and between the diffusion plate support member 24 and the diffusion plate 15. Has been placed. In the present embodiment, five reflectors 23 are disposed between two adjacent cold cathode tubes 20. Each reflector 23 is configured by using, for example, a PC resin mixed with a white colorant, and the entire reflector 23 is integrally formed by an injection molding method or the like to give a high light reflectance.

  Referring also to FIG. 5, each of the five reflectors 23 is a long reflecting member having substantially the same length as the effective light emitting portion of the cold cathode tube 20 disposed inside the case 12. 23 are provided in parallel with each other along the longitudinal direction of the cold cathode fluorescent lamp 20 on the reflection sheet 19. Further, two diffuser support members 24 are attached to each of the two reflectors 23 out of the five reflectors 23, and the two reflectors 23 correspond to two corresponding diffuser support members. It is designed to be shared as 24 bases.

  Specifically, referring also to FIG. 6, the reflector 23 is installed between the reflection sheet 19 and the two cold cathode tubes 20 to transmit the light of the corresponding cold cathode tubes 20 to the diffusion plate 15 side. Reflecting surfaces 23 a and 23 b that reflect each other, and side wall portions 23 c that are provided below the reflecting surfaces 23 a and 23 b and are erected on the reflecting sheet 19 are provided. The reflector 23 is configured to reflect the light of the cold cathode tube 20 toward the diffusion plate 15 by the reflecting surfaces 23a and 23b disposed closer to the cold cathode tube 20 than the reflection sheet 19. Thus, the light usage efficiency of the cold cathode fluorescent lamp 20 is further increased by efficiently increasing the amount of light incident on the diffusion plate 15.

  In the reflector 23, as illustrated in FIG. 6B, two locking portions 23d are provided so as to protrude downward from the lower end portion of the side wall portion 23c. And can be assembled to the backlight device 3. Further, in the reflector 23 that also serves as the base of the diffusion plate support member 24, an attachment hole for removably attaching the diffusion plate support member 24 is formed.

  Specifically, as shown in FIG. 7, the diffusion plate support member 24 is configured using a transparent material, for example, a PC resin, and is formed integrally by an injection molding method or the like. The diffusion plate support member 24 includes a base portion 24a having a rectangular cross section and a substantially conical column portion 24b extending from the base portion 24a to the diffusion plate 15 side. The light of the cold cathode fluorescent lamp 20 incident on the support column 24b can be emitted to the diffusion plate 15 side. Further, the diffusion plate support member 24 supports the diffusion plate 15 in a state in which the tip portion of the column portion 24 b is in contact with the diffusion plate 15 with the buffer member 25 interposed therebetween.

  The base 24a is integrally provided with a bolt 24c by insert molding or the like. In the diffusion plate support member 24, the bolt 24c is screwed to a nut 23e embedded in advance in the mounting hole of the reflector 23 by insert molding, for example. Thereby, in the diffusing plate support member 24, the base 24a and the base portion of the column 24b are embedded between the reflecting surfaces 23a and 23b so as to be detachably attached to the reflector 23. As shown in FIG.

  That is, in the reflector 23, the locking portion 23 d is formed in the conical shape of the locking portion 23 d in a state where the locking portion 23 d is inserted through the through holes formed in the reflection sheet 19 and the case 12 and protrudes to the outside of the case 12. When the leading end is locked on the outer surface of the case 12, the reflector 23 is assembled to the backlight device 3 with the diffusion plate support member 24 and the buffer member 25 attached.

  The buffer member 25 is made of a transparent and buffering material, such as urethane resin, and covers the tip of the column portion 24b of the diffusion plate support member 24 as illustrated in FIG. It is formed in a substantially cylindrical shape. In addition, the buffer member 25 having a thickness of about 0.5 to 3.0 mm is used, and further, the upper part that contacts the surface of the diffusion plate 15 is formed in a semicircular cross section, Without interfering with the surface of the plate 15, it is interposed between the front end portions of the support columns 24 b.

  As described above, in the present embodiment, since the buffer member 25 is interposed between the diffusion plate 15 and the tip end portion of the column portion 24b of the diffusion plate support member 24, the buffer member even when the diffusion plate 15 vibrates. The (buffer material) 25 can buffer the vibration of the diffusion plate 15. As a result, in the present embodiment, as in the first embodiment, it is possible to prevent generation of contact sounds such as vibration sound and sliding contact sound caused by contact between the diffusion plate 15 and the diffusion plate support member 22. Can do. Furthermore, in this embodiment, it is possible to easily configure the backlight device 3 and the liquid crystal display device 1 that prevent the user from feeling uncomfortable due to the contact sound.

  Further, in the present embodiment, the reflector 23 is used as a base portion of the diffusion plate support member 24. Therefore, unlike the first embodiment, the two cold-cathode tubes 20 are reflected by the reflecting surfaces 23a and 23b of the reflector 23. It is possible to support the diffusion plate 15 in a more stable state by the diffusion plate support member 24 while further improving the light utilization efficiency.

  In addition to the above description, the diffusing plate support member 22 shown in the first embodiment is detachably provided to the reflector 23 shown in the present embodiment, whereby the present embodiment and the first embodiment are provided. A combination of these can also be used.

  The above-described embodiments are all illustrative and not restrictive. The technical scope of the present invention is defined by the claims, and all modifications within the scope equivalent to the configurations described therein are also included in the technical scope of the present invention.

  For example, in the above description, the case where the present invention is applied to a liquid crystal display device including a direct type backlight device has been described. However, the present invention is not limited to this, and light from a light source is used. Further, the present invention can be applied to various display devices such as a projection display device (including rear projection) including a non-light emitting display portion that displays information such as images and characters.

  In addition to the above explanation, the present invention is installed on a light box for illuminating X-ray film or photographic negatives for irradiating light to make it easy to see, or on a signboard or a wall in a station. It can be suitably used as a backlight device of a light emitting device that illuminates advertisements and the like.

  Further, in the above description, the case where a transparent urethane resin is used for the buffer material that contacts the diffusion plate has been described, but the diffusion plate support member of the present invention has a buffer material in a portion that is in contact with or close to the diffusion plate. What is provided is sufficient. That is, when the diffusion plate is warped, the diffusion plate support member may be in contact with the diffusion plate.

  Another specific example of the cushioning material is silicon rubber. However, when the transparent urethane resin as described above is used, since the buffer material is made of a transparent material, the buffer material can be incident on the diffusion plate without blocking the light of the light source. This is preferable in that it is possible to prevent a decrease in utilization efficiency. Furthermore, in the incident light to the diffuser plate, it is possible to prevent the occurrence of a partial decrease in the amount of light due to the buffer material, so that it is possible to prevent the occurrence of uneven brightness on the light exit surface of the diffuser plate, resulting in uneven brightness. It is also preferable in that the deterioration of display quality can be prevented. Further, the use of a buffer material having excellent heat resistance such as urethane resin or silicone rubber is preferable in that it is possible to prevent the occurrence of the contact sound without being adversely affected by heat from the light source.

  In the above description, the case where four diffusion plate support members using PC resin are provided in the case (housing) has been described, but the diffusion plate support member of the present invention is not limited to this, Depending on the size, weight, material, etc. of the diffusion plate, the material, shape, number of installations, etc. of the diffusion plate support member can be changed as appropriate. Also, for example, the base is configured using a metal such as white PC resin mixed with a white colorant or aluminum having high light reflectance, or the support column is configured using a ceramic material having excellent light transmittance. You can also do it.

  In the above description, the case where a cold cathode tube is used as a linear light source has been described. However, the light source of the present invention is not limited to this, and a xenon tube which is a hot cathode tube or a mercury-less lamp. Other linear light sources such as can also be used. Further, for example, a non-straight tubular U-shaped lamp (including a pseudo U-shaped tube) whose entire shape is formed in a U shape can be used. Furthermore, a point light source such as a light emitting diode (LED) or a light source converted into a linear light source by arranging a plurality of point light sources on a straight line or a planar light source such as an organic EL (OLED) can be used. .

It is a schematic sectional drawing explaining the display apparatus concerning the 1st Embodiment of this invention. It is a top view explaining the principal part structure of the display apparatus shown in FIG. It is the III-III sectional view taken on the line of FIG. It is a schematic sectional drawing explaining the display apparatus concerning the 2nd Embodiment of this invention. FIG. 5 is a plan view illustrating a main configuration of the display device illustrated in FIG. 4. (A) is an enlarged plan view of the diffusion plate support member and reflector shown in FIG. 5, and (b) is an enlarged side view of the diffusion plate support member and reflector. It is the VII-VII sectional view taken on the line of FIG.

Explanation of symbols

1 Liquid crystal display device 2 Liquid crystal panel (display unit)
3 Backlight device 12 Case (housing)
15 Diffuser 20 Cold cathode tube (light source)
22, 24 Diffusion plate support member 22a, 24a Base portion 22b, 24b Strut portion 22c Tip portion (buffer material)
22d Locking portion 25 Buffer member 23 Reflector (base)
23d Locking part

Claims (9)

A diffusion plate support member that supports a diffusion plate that diffuses light from a light source,
A diffusion plate support member, characterized in that a cushioning material is provided at a portion in contact with or close to the diffusion plate. A base fixed to a housing containing the light source;
A column portion extending from the base to the diffusion plate side and having a tip portion in contact with or close to the diffusion plate,
The diffusion plate support member according to claim 1, wherein a distal end portion of the support column is configured using a cushioning material. A base fixed to a housing containing the light source;
A strut extending from the base to the diffusion plate side,
The diffusion plate support member according to claim 1, wherein a tip portion of the support column is in contact with or close to the diffusion plate with a buffer member using a buffer material interposed. The diffuser plate support member according to any one of claims 2 to 3, wherein a reflector that is provided between the two light sources and reflects light from each of the two light sources is used in the base portion. The diffusion plate support member according to any one of claims 2 to 4, wherein the base portion is provided with a locking portion that is locked to the housing in a state of protruding to the outside of the housing. The diffusion plate support member according to any one of claims 2 to 5, wherein a surface of the base portion is a color having a high light reflectance. The diffusion plate support member according to claim 1, wherein the buffer material is a transparent material. A backlight device comprising a light source and a diffusion plate for diffusing light from the light source,
A backlight device that supports the diffusion plate by using the diffusion plate support member according to claim 1. A display device comprising: a light source; a diffusion plate that diffuses light from the light source; and a display unit that emits light from the light source through the diffusion plate,
A display device that supports the diffusion plate by using the diffusion plate support member according to claim 1.

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