JP2011210692A - Light source device and display device including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce unevenness of brightness of a display device under high humidity and high temperature conditions.SOLUTION: A light source device includes a light guide plate which is disposed behind a display panel and guides incident light to be output toward the display panel, a reflecting sheet which is disposed behind the light guide plate and reflects at least part of light output rearward from the light guide plate toward the light guide plate, and a frame which accommodates at least the light guide plate. The frame includes a regulating piece for keeping the light guide plate and the reflecting sheet apart from each other.

Description

  The present invention relates to a display panel, a light source device that illuminates the display panel, and a display device including the same.

  For example, a display device including a backlight is known as a light source device. The backlight includes a light guide plate having a light source such as an LED disposed on an end surface thereof, an optical sheet disposed on the front side of the front surface of the light guide plate, and a reflection sheet disposed on the rear side of the light guide plate ( Patent Document 1).

JP 2008-076918 A

In the liquid crystal display device having the backlight described above, when the reflective sheet is formed of a synthetic resin, the reflective sheet is deformed when exposed to a high temperature and high humidity environment, and the reflective sheet contacts the light guide plate. There is a problem that a portion that does not come into contact with a portion that does not come into contact with each other, the brightness becomes nonuniform between these portions, the brightness of the liquid crystal display panel becomes nonuniform, and the display quality deteriorates.
An object of the present invention is to provide a light source device capable of displaying uniform brightness even in a high temperature and high humidity environment, and a display device including the same.

  The light source device according to claim 1 is disposed on the rear side of the display panel, guides incident light and emits the light toward the display panel, and is disposed on the rear side of the light guide plate. A reflection sheet that reflects at least a part of light emitted toward the rear side toward the light guide plate, and a frame that houses at least the light guide plate. The frame includes the light guide plate and the reflection. A restriction piece for separating the sheet is provided.

  The light source device according to claim 2, wherein the light source device has a thickness between the first main surface and the second main surface, guides the light incident from the end surface, and emits the light from the first main surface. And a reflection sheet that is disposed so as to face the second main surface and reflects light leaking from the second main surface out of the light guided through the light guide plate toward the light guide plate. And at least a frame for housing the light guide plate, wherein the frame is provided with a regulating piece for separating the light guide plate and the reflection sheet.

  According to a third aspect of the present invention, in the light source device according to the first or second aspect, the frame includes a panel holding frame portion that holds the display panel and a light guide plate holding portion that holds the light guide plate. And the regulating piece is formed on the opposite side of the end portion of the light guide plate holding portion to the side on which the panel holding frame portion is disposed with respect to the light guide plate holding portion.

  According to a fourth aspect of the present invention, in the light source device according to any one of the first to third aspects, the frame houses at least the light guide plate and the reflective sheet, and the restricting piece includes the light guide plate. It includes a plurality of claws for holding the light plate in the frame.

  According to a fifth aspect of the present invention, in the light source device according to any one of the first to fourth aspects, the regulating piece moves the light guide plate in the direction of the reflective sheet side and the opposite side. It is characterized by including a plurality of nails to be regulated.

  According to a sixth aspect of the present invention, in the light source device according to the fifth aspect, a claw that restricts the light guide plate from moving toward the reflection sheet among the plurality of claws from the frame to the frame. The length extending to the side where the light guide plate is arranged is such that a claw for restricting the light guide plate from moving to the opposite side among the plurality of claws is arranged from the frame to the frame. It is characterized by being shorter than the length extending to the other side.

  According to a seventh aspect of the present invention, in the light source device according to the fifth aspect, a claw that restricts the light guide plate from moving toward the reflection sheet among the plurality of claws from the frame to the frame. The length extending to the side where the light guide plate is arranged is such that a claw for restricting the light guide plate from moving to the opposite side among the plurality of claws is arranged from the frame to the frame. It is characterized by being longer than the length extending to the other side.

  According to an eighth aspect of the present invention, in the light source device according to the fourth to seventh aspects, the frame has a rectangular shape, and the plurality of claws are provided on a pair of opposing sides of the rectangular shape. It is characterized by that.

  According to a ninth aspect of the present invention, in the light source device according to any one of the fourth to eighth aspects, the panel holding frame portion supports a peripheral portion of the display panel, and the plurality of claws are the guides. A claw for restricting movement of the light plate to the display panel side and a claw for restricting movement of the light guide plate in a direction opposite to the display panel side are included.

  According to a tenth aspect of the present invention, in the light source device according to any one of the fourth to ninth aspects, the plurality of claws are protrusions having elasticity.

  An eleventh aspect of the present invention is the light source device according to any one of the first to tenth aspects, further comprising a lower case that holds the reflective sheet between the restriction piece of the frame. And

  A display device according to a twelfth aspect includes the light source device according to any one of the first to eleventh aspects, and a display panel arranged to overlap the light guide plate of the light source device. .

  According to a thirteenth aspect of the present invention, in the display device according to the twelfth aspect of the present invention, the display device further includes an upper case that holds the display panel housed in the frame around the display panel.

  According to a fourteenth aspect of the present invention, in the display device according to any one of the first to thirteenth aspects, the restricting piece is formed integrally with the frame by an elastic resin. To do.

  According to the light source device and the display device of the present invention, it is possible to perform display with uniform brightness even in a high temperature and high humidity environment.

The disassembled perspective view of the liquid crystal display device A which shows 1st Embodiment of this invention. (A) And (b) is sectional drawing along the IIa-IIa cutting | disconnection line of FIG. 1 of the liquid crystal display device 1 concerning 1st Embodiment, and the IIb-IIb cutting | disconnection line. (A) And (b) is sectional drawing along the IIIa-IIIa cut line and IIIb-IIIb cut line of FIG. 4 of the liquid crystal display device 1A which shows the 2nd Embodiment of this invention. The perspective view which shows the structure of the main member in 2nd Embodiment of this invention. Sectional drawing along the VV cut line of FIG. 6 of the liquid crystal display device 1B which shows 3rd Embodiment of this invention. The perspective view which shows the structure of the main member in 3rd Embodiment of this invention. (A) And (b) is sectional drawing along the VIIa-VIIa cutting | disconnection line of FIG. 8 of the liquid crystal display device 1C which shows the 4th Embodiment of this invention, and the VIIb-VIIb cutting | disconnection line. The perspective view which shows the structure of the main member in 4th Embodiment of this invention.

(Example 1)
1 and 2 show a first embodiment of the present invention. FIG. 1 is an exploded perspective view of a liquid crystal display device 1 as a display device, and FIGS. 2 (a) and 2 (b) are schematic views. FIG. 2 is a cross-sectional view of the liquid crystal display device according to the first embodiment, taken along line IIa-IIa and line IIb-IIb in FIG.

  As shown in FIG. 1 and FIGS. 2A and 2B, the liquid crystal display device 1 according to the embodiment of the present invention includes a front substrate 11 provided with a polarizing plate 14 on the front surface and a polarizing plate 15 on the rear surface. A liquid crystal display element 10 disposed opposite to the provided rear substrate 12 via a liquid crystal 16 and a sealing material 13, a light guide plate 20 disposed on the rear side of the liquid crystal display element 10, and the light guide plate 20 And a plurality of optical films 21 such as a prism sheet 21a and a diffusing plate 21b disposed between the light guide plate 20 and the liquid crystal display device 10. A reflection sheet 40 that reflects a part of the light leaked in a direction other than the above direction; a frame 30 that holds the liquid crystal display element 10, the light guide plate 20, the optical film 21, the reflection sheet 40, and the like; On top of these And a over scan 60 and the lower case 50.

  In the liquid crystal display element 10, a plurality of transparent electrodes (not shown) are formed on at least one of the surfaces of the pair of substrates 11 and 12 facing each other, and the region surrounded by the sealing material 13 between the pair of substrates 11 and 12 The liquid crystal 16 is sealed. In addition, a liquid crystal driving film wiring substrate (not shown) for supplying a driving signal or the like to a driving circuit (not shown) for driving the liquid crystal display element 10 is provided.

  The liquid crystal display panel 10 includes a twisted nematic liquid crystal display element in which liquid crystal molecules of a liquid crystal layer are substantially twisted by 90 ° between the pair of substrates 11 and 12, and between the pair of substrates 11 and 12. The STN type in which the liquid crystal molecules are twisted by 90 ° or more, the vertical alignment type in which the liquid crystal molecules are aligned substantially perpendicular to the surfaces of the substrates 11 and 12, and the substrate 11 with the molecular long axes of the liquid crystal molecules aligned in one direction. , 12 can be applied to any of a non-twisted horizontal alignment type that is aligned substantially parallel to the plane, a bend alignment type that bends liquid crystal molecules, and a ferroelectric or antiferroelectric liquid crystal display element. .

  The liquid crystal display panel 10 includes a pixel electrode for forming a plurality of pixels on the inner surface of one of the pair of substrates 11 and 12, and a plurality of counter electrodes formed by being insulated from the pixel electrode. And a horizontal electric field control type in which a horizontal electric field (an electric field in a direction along the substrate surface) is generated between these electrodes to change the alignment state of the liquid crystal molecules. Further, it may be an active drive type liquid crystal display element using a thin film transistor, or a passive drive type liquid crystal display element in which a plurality of row electrodes and a plurality of column electrodes are arranged to cross each other.

  The light guide plate 20 is made of a transparent rectangular plate-like member, and emits light incident from an incident end surface which is one of side surfaces, from a light emitting surface (first main surface) which is a front surface. The reflection sheet 40 is made of a resin film having light reflectivity or a resin film coated with a metal film. A light source such as an LED (light emitting diode) (not shown) is disposed opposite to the incident end face of the light guide plate 20, and light emitted from the light source is incident on the light guide plate 20 through the incident end face. In the present specification, a surface of the light guide plate 20 that is disposed to face the first main surface is referred to as a second main surface, and the light guide plate 20 includes the first main surface and the second main surface. It has a thickness between the main surface. The reflection sheet 40 is disposed so as to face the second main surface of the light guide plate 20, and the light leaked from the second main surface among the light guided through the light guide plate 20 is Reflected toward the light guide plate 20.

  The liquid crystal display panel 10 and the backlight 70 are held by a frame 30 formed of resin. The frame 30 surrounds and holds the peripheral portion of the liquid crystal display panel 10 and a light guide plate holding portion that is disposed behind the panel holding frame portion 30a and surrounds and holds the light guide plate 20. 30b and the reflection sheet holding part 30c arranged behind the light guide plate holding part 30b and surrounding and holding the optical sheet 40. The panel holding frame portion 30a, the light guide plate holding portion 30b, and the reflection sheet holding portion 30c are integrally formed.

  The light guide plate holding portion 30b is provided with a plurality of elastic upper and lower restricting pieces 30d and 30e, and the light guide plate 20 is held by the upper and lower restricting pieces 30d and 30e. That is, at the foremost end side of the light guide plate holding portion 30b of the frame 30, one surface is the uppermost surface of the light guide plate holding portion 30b at substantially the center of a pair of opposing sides of the rectangle of the panel holding frame portion 30a. A plurality of upper restricting pieces 30d that are in contact with the front surface of the prism sheet 21a disposed on the front side of the light guide plate 20 and are made of elastic projections extending inward of the rectangular frame. It is integrally formed. Further, on the rear end side of the light guide plate holding portion 30b of the frame 30, one surface is held by the light guide plate at both ends of a pair of sides provided with the upper restricting pieces 30d in the rectangle of the panel holding frame portion 30a. A plurality of lower restricting pieces 30e that are flush with the lowermost surface of the portion 30b and that have elastic projections extending inward of the rectangular frame and abut against the rear surface of the light guide plate 20 are integrally formed. Has been.

  The plurality of optical sheets 21 are attached to and integrated with the light guide plate 20, and the integrated light guide plate 20 deflects the plurality of upper and lower regulation pieces 30 d and 30 e of the frame 30. Alternatively, the frame 30 itself is bent and inserted and locked between the upper restriction piece 30d and the lower restriction piece 30e. Thereafter, the liquid crystal display panel 10 is inserted into the panel holding frame portion 30 a from the front side of the frame 30. Then, the reflective sheet 40 is inserted into contact with the lower regulating piece 30e from the rear side of the frame 30, and the lower case 50 is fitted from the rear side of the frame 30 holding them, and the upper case 60 is inserted from the front side. By fitting, the liquid crystal display panel 10, the light guide plate 20, the reflection sheet 40, and the like can be held in the frame 30 and stored in the upper and lower cases 60 and 50.

  Thus, the reflection sheet 40 is disposed on the rearmost end side with the lower restriction piece 30e on the rear side of the frame 30 interposed therebetween. Therefore, the reflection sheet 40 is incorporated in the frame 30 in a state of being separated from the light guide plate 20 by a distance corresponding to the thickness of the lower restriction piece 30e. Therefore, even if the liquid crystal display device 1 is exposed to a high temperature and humidity environment and the reflection sheet 40 is deformed, there is a sufficient distance between the light guide plate 20 and the thickness of the lower restriction piece 30e. Since it is opened, the reflection sheet 40 does not come into contact with the light guide plate 20, and the light emitted from the light guide plate 20 does not cause unevenness, and uniform display by uniform illumination can be obtained.

  In the above-described embodiment, the liquid crystal display panel 10, the light guide plate 20 and the like are fixed by being sandwiched between the upper and lower cases 60 and 50. For example, between the panel holding frame 30a and the upper case 60, The liquid crystal display panel 10 is fixed so as to be sandwiched. However, the present invention is not limited to this, and each member may be fixed with an adhesive or an adhesive. For example, the panel holding frame of the frame 30 A double-sided adhesive tape may be disposed on the portion 30a, and the liquid crystal display panel 10 and the frame 30 may be fixed by this adhesive tape.

  As described above, the liquid crystal display device 1 of the present invention includes the display panel 10, the light guide plate 20 that is disposed on the rear side of the display panel 10, guides incident light, and emits the light toward the display panel 10. A reflective sheet 40 disposed on the rear side of the light guide plate 20 and reflecting at least a part of light emitted from the light guide plate 20 in a direction other than the direction of the liquid crystal display panel 10 toward the light guide plate 20; Among the display panel 10, the light guide plate 20, and the reflective sheet 40, the frame 30 that houses at least the light guide plate 40, the rear surface of the light guide plate 20, and the reflective sheet 40, Since the regulation piece 30e for separating the optical plate 20 and the reflection sheet 40 is provided, uniform display by illumination with uniform brightness can be obtained.

  In the liquid crystal display device 1, the lower regulating piece 30 e is preferably formed integrally with the frame 30, thereby simplifying the frame structure.

  In the liquid crystal display device 1, at least the light guide plate 20 and the reflection sheet 40 are accommodated in the frame 30, and the upper restricting piece 30 d is held in the frame 30. And the lower restricting piece 30e is a plurality of claws for restricting the movement of the light guide plate 20 in the direction opposite to the display panel 10 and the opposite side, thereby simplifying the structure of the frame 30. In addition, the light guide plate 20 can be easily assembled.

  Further, in the liquid crystal display device 1 of this embodiment, the upper case 60 that holds the liquid crystal display panel 10 housed in the frame 30 around the periphery, and the reflection sheet 40 with the lower regulating piece 30 e of the frame 30. Since at least one of the lower cases 50 held between them is provided, the liquid crystal display panel 10 and the like of the liquid crystal display device 1 can be reliably fixed with few parts.

  Furthermore, in the liquid crystal display device 1 of this embodiment, the upper and lower restricting pieces 30d, 30e are formed integrally with the frame 30 by using an elastic resin, thereby reducing the number of parts and making assembly easy. Can be.

(Example 2)
3A and 3B are cross-sectional views of the liquid crystal display device according to the second embodiment of the present invention taken along the IIIa-IIIa and IIIb-IIIb cut lines in FIG. 4, and FIG. It is a perspective view which shows the shape of the flame | frame in 2 embodiment. Note that in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the second embodiment shown in FIGS. 3A and 3B and FIG. 4, the liquid crystal display panel 10 is attached to the frame 31 by an adhesive as compared with the display device 1 of the first embodiment. By fixing, the point which abbreviate | omitted the upper case 60 differs, and the other structure is the same as 1st Embodiment.

  In the display device 1A of this embodiment, the liquid crystal display panel 10 and the like are held by a frame 31 as in the first embodiment. The frame 31 includes a panel holding frame portion 31a that surrounds and holds the periphery of the liquid crystal display panel 10, and a plurality of elastic members for holding the light guide plate 20 on the rear side of the panel holding frame portion 31a. Reflection provided on the rear side of the lower regulating piece 31e on the rear side of the light guide plate holding portion 31b formed by the upper and lower regulating pieces 31d and 31e, which includes an upper regulating piece 31d and a lower regulating piece 31e. It consists of a sheet holding part 31c.

  On the rear side of the panel holding frame portion 31a of the frame 10, there is provided an elasticity that extends to the inside of the rectangular frame, with one surface coinciding with the stepped surface substantially at the center of the rectangular frame of the panel holding frame portion 31a. A plurality of upper restricting pieces 31d that are formed by holding projections and come into contact with the front surface of the light guide plate 20 are integrally formed. In addition, a plurality of lower restrictions that contact the rear side of the light guide plate 20 are formed at both ends in the longitudinal direction of the rectangular frame of the panel holding frame portion 31a by elastic protrusions extending inward of the rectangular frame. The piece 31e is integrally formed.

  To assemble the liquid crystal display panel 10 on the frame 21, first, the light guide plate 20 is assembled, then the liquid crystal display panel 10 is assembled, and finally the lower case 51 is assembled.

  That is, since the plurality of optical sheets 21 are attached to and integrated with the light guide plate 20, the integrated light guide plate 22 includes a plurality of upper and lower regulating pieces 31d and 31e of the frame 31. Or the frame 31 itself is bent and inserted between the upper restriction piece 31d and the lower restriction piece 31e. Thereafter, the adhesive tape 80 is applied to the panel holding frame portion 31 a of the frame 31, and the liquid crystal display panel 10 is attached to the adhesive tape 80, thereby fixing the liquid crystal display panel 10 to the frame 31. Then, the reflective sheet 40 is inserted into contact with the lower restricting piece 31e from the rear side of the frame 31, and the lower case 51 is fitted from the rear side of the frame 31 that holds them, whereby the liquid crystal display device 1A. Is assembled.

  Thus, the reflection sheet 40 is disposed on the rearmost side with the lower restriction piece 31e on the rear side of the frame 31 interposed therebetween. Therefore, since the reflection sheet 40 is incorporated in the frame 31 in a state of being separated from the light guide plate 20 by a distance corresponding to the thickness of the lower restriction piece 31e, it is assumed that the reflection sheet 40 is deformed. In addition, since a sufficient distance corresponding to the thickness of the lower regulation piece 31e is provided between the light guide plate 20 and the light emitted from the light guide plate 20, no unevenness occurs.

  Moreover, according to this embodiment, since the upper case can be omitted, the number of parts is reduced.

  As described above, in the liquid crystal display device 1A of this embodiment, the frame 31 is moved to the display panel 10 side with the panel holding frame portion 31a in contact with the peripheral portion of the display panel 10 and the light guide plate 20. Since the plurality of claws to be regulated and the plurality of claws to regulate movement in the rear direction of the light guide plate 20 are provided and the upper case is not used, the number of parts can be reduced.

(Example 3)
FIG. 5 is a cross-sectional view of a liquid crystal display device 1B according to the third embodiment of the present invention, and FIG. 6 is a perspective view showing the shape of the frame in the second embodiment. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The third embodiment shown in FIGS. 5 and 6 is formed integrally with the frame 32 between the light guide plate 20 and the reflection plate 40 to separate the light guide plate 20 and the reflection plate 40 from each other. 32d, and the light guide plate and the liquid crystal display panel are fixed by an upper case. Compared with the first embodiment, the upper restricting piece for holding and holding the light guide plate 20 is provided. It is different in that it is not provided, and the other configuration is the same as that of the first embodiment.

  In the display device 1B of this embodiment, the liquid crystal display panel 10 and the like are held by a frame 32, as in the first embodiment. The frame 32 includes a panel holding frame portion 32a that surrounds and holds the periphery of the liquid crystal display panel 10, and a light guide plate holding portion 32b that holds the light guide plate 20 behind the panel holding frame portion 32a. A plurality of lower restricting pieces 32e are disposed only on the rear side of the light guide plate holding portion 32b, and are further provided on the rear side of the lower restricting pieces 32b disposed on the rear side of the light guide plate holding portion 32b. It consists of a reflection sheet holding part 32c.

  That is, the rear end side of the light guide plate holding portion 32b of the frame 32 includes protrusions extending inward of the rectangular frame at substantially the center and both ends of the rectangular frame of the light guide plate holding portion 32b. A plurality of lower restricting pieces 32 e that come into contact with the back surface of the 20 are formed integrally with the frame 32.

  In order to assemble the liquid crystal display panel 10 on the frame 32, first, the light guide plate 20 in which the plurality of optical sheets 21 are integrated is inserted on the plurality of lower restriction pieces 32 e of the frame 32. Thereafter, the liquid crystal display panel 10 is inserted into the panel holding frame portion 32 a from the front side of the frame 32. Then, the reflective sheet 40 is inserted into contact with the lower regulating piece 32d from the rear side of the frame 32, and the lower case 50 is fitted from the rear side of the frame 32 holding these, and the upper case 60 from the front side. The liquid crystal display panel 10, the light guide plate 20, the reflection sheet 40, etc. are held in the frame 32 and stored in the upper and lower cases.

  Thus, the reflection sheet 40 is disposed on the rearmost end side with the lower restriction piece 32e on the rear side of the frame 32 interposed therebetween. Therefore, since the reflection sheet 40 is incorporated in the frame 32 in a state of being separated from the light guide plate 20 by a distance corresponding to the thickness of the lower restriction piece 32e, it is assumed that the reflection sheet 40 is deformed. In addition, since a sufficient distance corresponding to the thickness of the lower restricting piece 32e is provided between the light guide plate 20 and the light emitted from the light guide plate 20, unevenness does not occur.

  Further, according to the display device 1B of the present invention, since the upper restricting piece between the liquid crystal display panel 10 and the light guide plate 20 is not provided, the thickness of the liquid crystal display device 1B can be reduced.

  Thus, in the liquid crystal display device 1B of this embodiment, the frame 32 has a step-like panel holding frame portion 32a that houses the liquid crystal display panel 10, and a light guide plate holding portion 32b that houses the light guide plate 20. And the lower restricting piece 32e is formed only on the rear side of the light guide plate holding portion 32b, so that the liquid crystal display device 1B can be thinned.

Example 4
7 (a) and 7 (b) are cross-sectional views taken along the line VIIa-VIIa and the line VIIb-VIIb in FIG. 8 of the liquid crystal display device 1C according to the fourth embodiment of the present invention. It is a perspective view which shows the shape of the flame | frame in 4th Embodiment. Note that in the fourth embodiment, identical symbols are assigned to configurations identical to those in the first embodiment and descriptions thereof are omitted.

  In the fourth embodiment shown in FIGS. 7A, 7B, and 8, the liquid crystal display panel 10 is arranged on the front side of the frame 33 as compared with the display device 1 of the first embodiment. The other configuration is the same as that of the first embodiment.

  In the display device 1 </ b> C of this embodiment, the liquid crystal display panel 10 is disposed on the front side of the frame 33. The frame 33 has a holding frame front surface 33a with which the peripheral portion of the liquid crystal display panel 10 abuts and a rectangular frame of the holding frame front surface 33a, and has one surface aligned with the holding frame front surface 33a. A plurality of upper restricting pieces 33 d that are in contact with the front side of the light guide plate 20 are integrally formed. Further, at both ends of the rectangular frame of the holding frame front surface 33a, a plurality of lower restricting pieces 33e which are made of elastic protrusions extending inward of the rectangular frame and come into contact with the back surface of the light guide plate 20 are integrally formed. Is formed. Further, a reflection sheet holding portion 33c is provided further rearward than the lower restriction piece 33e on the rear side of the light guide plate holding portion 33b formed by the upper and lower restriction pieces 33d and 33e.

  In order to assemble the liquid crystal display device 1C of this embodiment, first, the light guide plate 20 in which the plurality of optical sheets 21 are integrated is bent by the plurality of upper and lower restricting pieces 33d and 33e of the frame 33 or the frame. It is bent and inserted between the upper restriction piece 33d and the lower restriction piece 33e. Thereafter, the reflective sheet 40 is inserted into contact with the lower regulating piece 33e from the rear side of the frame 33, and the lower case 50 is fitted from the rear side of the frame 33 holding these, and then the liquid crystal display panel 10 is inserted. The upper case 60 is fitted from the front side with the periphery thereof in contact with the holding frame front surface 33a on the front surface of the frame 33, whereby the liquid crystal display panel 10, the light guide plate 20, and the reflection sheet are inserted into the frame 33. 40 and the like are held and stored in the upper and lower cases 50 and 60.

  Thus, the reflection sheet 40 is disposed on the rearmost end side with the lower restriction piece 33e on the rear side of the frame 33 interposed therebetween. Therefore, since the reflection sheet 40 is incorporated in the frame 33 in a state separated from the light guide plate 20 by a distance corresponding to the thickness of the lower restriction piece 33e, the reflection sheet 40 is deformed. In addition, since a sufficient distance corresponding to the thickness of the lower restricting piece 33e is provided between the light guide plate 20 and the light emitted from the light guide plate 20, unevenness does not occur.

  Further, according to the display device 1C of the present invention, since the frame 33 is formed so that the periphery of the liquid crystal display panel 11 is in contact with the holding frame front surface 33a, the structure of the frame 33 can be simplified. .

  In the first, third, and fourth embodiments described above, the liquid crystal display panel 11 is stored in contact with the panel holding frame portions 30a, 32a of the frames 30, 32, 33 and the holding frame front surface 33a. However, the present invention is not limited to this, and the panel holding frame portions 30a, 32a and the holding frame front surface 33a of the frame frames 30, 32, 33 are provided with an adhesive material such as a double-sided adhesive tape or an adhesive, and the liquid crystal display. The panel 10 may be fixed to the panel holding frame portions 30a, 32a and the holding frame front surface 33a of the frames 30, 32, 33 by this adhesive material or the like.

  Further, in each of the above-described embodiments, the upper regulating piece 30d is formed at substantially the center of a pair of opposing sides of the rectangle of the panel holding frame portion 30a, and the lower regulating piece 30e is formed at both ends of the same pair of sides. However, the number of the upper restricting pieces 30d and the lower restricting pieces 30e to be formed and the positions to be formed are not limited thereto. That is, the upper restricting pieces 30d may be formed at both ends of a pair of opposing sides of the rectangle of the panel holding frame portion 30a, and the lower restricting pieces 30e may be formed at substantially the center of the same pair of sides.

  Further, a plurality of upper restricting pieces 30d and a plurality of lower restricting pieces 30e may be formed on a pair of opposing sides of the rectangle of the panel holding frame portion 30a. By increasing the number of the upper restricting pieces 30d and the lower restricting pieces 30e, the light guide plate 20 and the plurality of optical sheets 21 fitted between the upper restricting pieces 30d and the lower restricting pieces 30e can be made difficult to come off.

  Further, the upper restriction piece 30d or the lower restriction piece 30e may be formed on a pair of opposed long sides or a pair of opposed short sides of the rectangle of the panel holding frame portion 30a. The upper restricting piece 30d or the lower restricting piece 30e may be formed on adjacent sides of the rectangle of the panel holding frame 30a, but the upper restricting piece 30d or the lower restricting piece 30e is formed at least on a pair of opposite sides. Thus, the light guide plate 20 and the plurality of optical sheets 21 can be stably sandwiched.

  Further, the length of the upper restricting piece 30d extending toward the inside of the rectangular frame may be shorter than the length of the lower restricting piece 30e extending toward the inside of the rectangular frame. Accordingly, when the light guide plate 20 and the plurality of optical sheets 21 are fitted between the upper restriction piece 30d and the lower restriction piece 30e, the light guide plate 20 and the plurality of optical sheets 21 are moved from the front side of the frame 30. When inserted, the light guide plate 20 and the plurality of optical sheets 21 can be bent while being locked by the lower regulating piece 30e, so that the insertion from the front side of the frame 30 can be facilitated. Similarly, when the length of the lower restricting piece 30e extending toward the inside of the rectangular frame is shorter than the length of the upper restricting piece 30d extending toward the inside of the rectangular frame, the light guide plate 20 Alternatively, the plurality of optical sheets 21 can be easily inserted from the rear side of the frame 30.

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display panel, 11, 12 ... Board | substrate, 13 ... Sealing material, 14, 15 ... Polarizing plate, 16 ... Liquid crystal, 20 ... Light guide plate, 21 ... Optical film, 21a ... Prism sheet, 21b ... Diffusing plate, 30, 31, 32, 33 ... frame, 30 a, 31 a, 32 a ... panel holding frame part, 33 a ... front surface of the holding frame, 30 b, 31 b, 32 b, 33 b ... light guide plate holding part, 30 c, 31 c, 32 c, 33 c ... reflective sheet holding part , 30d, 31d, 33d ... upper regulating piece, 30e, 31e, 32e, 33e ... lower regulating piece, 40 ... reflective sheet, 50 ... lower case, 51 ... lower case, 60 ... upper case, 70 ... backlight, 80 ... Adhesive tape.

Claims (14)

A light guide plate that is disposed on the rear side of the display panel, guides the incident light, and emits the light toward the display panel;
A reflective sheet that is disposed on the rear side of the light guide plate and reflects at least part of the light emitted from the light guide plate toward the rear side toward the light guide plate;
A frame for storing at least the light guide plate,
The light source device according to claim 1, wherein a restriction piece for separating the light guide plate and the reflection sheet is provided on the frame. A light guide plate having a thickness between the first main surface and the second main surface, and guiding the light incident from the end surface to be emitted from the first main surface;
A reflective sheet that is disposed so as to face the second main surface and reflects light that has leaked from the second main surface out of the light guided through the light guide plate toward the light guide plate;
A frame for storing at least the light guide plate,
The light source device according to claim 1, wherein a restriction piece for separating the light guide plate and the reflection sheet is provided on the frame. The frame includes a panel holding frame portion that holds the display panel and a light guide plate holding portion that holds the light guide plate,
The restriction piece is formed on the opposite side of the end portion of the light guide plate holding portion to the side on which the panel holding frame portion is disposed with respect to the light guide plate holding portion. The light source device according to claim 2. The frame houses at least the light guide plate and the reflection sheet,
The light source device according to claim 1, wherein the restriction piece includes a plurality of claws for holding the light guide plate in the frame.   5. The light source according to claim 1, wherein the restricting piece includes a plurality of claws for restricting the light guide plate from moving in the direction of the reflective sheet side and the opposite side thereof. apparatus.   Of the plurality of claws, a length of a claw for restricting the light guide plate from moving toward the reflection sheet extends from the frame to the side where the light guide plate is disposed. The claw for restricting the movement of the light guide plate to the opposite side is shorter than a length extending from the frame to the side where the light guide plate is disposed with respect to the frame. Light source device.   Of the plurality of claws, a length of a claw for restricting the light guide plate from moving toward the reflection sheet extends from the frame to the side where the light guide plate is disposed. 6. The claw for restricting the movement of the light guide plate to the opposite side is longer than a length extending from the frame to a side where the light guide plate is disposed with respect to the frame. Light source device.   The light source device according to claim 4, wherein the frame has a rectangular shape, and the plurality of claws are provided on a pair of opposing sides of the rectangle. The panel holding frame portion supports a peripheral portion of the display panel,
The plurality of claws include a claw for restricting movement of the light guide plate to the display panel side and a claw for restricting movement of the light guide plate in a direction opposite to the display panel side. The light source device according to any one of claims 4 to 8.   The light source device according to claim 4, wherein the plurality of claws are protrusions having elasticity.   The light source device according to any one of claims 1 to 10, further comprising a lower case that holds the reflection sheet between the restriction piece of the frame.   A display device comprising: the light source device according to any one of claims 1 to 11; and a display panel arranged to overlap the light guide plate of the light source device.   The display device according to claim 12, further comprising an upper case that holds the display panel housed in the frame around the display panel.   The display device according to claim 1, wherein the regulating piece is formed integrally with the frame by an elastic resin.

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