Image display device

An image display device includes: a light guide plate which includes an front face from which light from a light source exits; a heat sink that holds the light source portion and the light guide plate; a base plate which accommodates the light source portion, the light guide plate, and the heat sink; and a frame which is fixed to a wall portion of the base plate and holds the light guide plate from front of the light guide plate. The frame includes: a main body disposed inwardly of and along the wall portion; and a holder extending from the main body. The holder holds an end portion of the light guide plate from the front of the light guide plate, and the end portion is on a side of the end face from which light emitted from the light source portion enters.

CROSS-REFERENCE OF RELATED APPLICATIONS

This application is the U.S. National Phase under 35 U.S.C. § 371 of International Patent Application No. PCT/JP2018/023926, filed on Jun. 25, 2018, which in turn claims the benefit of Japanese Application No. 2017481833, filed on Sep. 21, 2017, the entire disclosures of which applications are incorporated by reference herein.

TECHNICAL FIELD

The present disclosure relates to an image display device for displaying an image.

BACKGROUND ART

Liquid crystal displays are known as one of image display devices for displaying an image (for example, see Patent Literature (PTL) 1). These liquid crystal displays each include a back light unit which is disposed on the rear-face side of a liquid crystal cell. The back light unit includes, for example, a light guide plate, and a light source portion whose emitted light enters the light guide plate from an end face of the light guide plate. For example, PTL 1 discloses a technique relating to a light guide plate that, is large and excellent in terms of productivity.

CITATION LIST

Patent Literature

SUMMARY OF THE INVENTION

Technical Problem

The present disclosure provides an image display device that can reduce the occurrence of light leakage.

Solution to Problem

An image display device according to the present disclosure includes: a light source portion; a light guide plate in a shape of a quadrilateral, the light guide plate including an end face from which light emitted from the light source portion enters and an front face from which the light exits; a heat sink that holds the light source portion and the light guide plate; a base plate which accommodates the light source portion, the light guide plate, and the heat sink; and a frame that holds the light guide plate from front of the light guide plate in a state in which the frame is fixed to a wall portion of the base plate. The frame includes: a main body disposed inwardly of and along the wall portion; and a holder extending from the main body, the holder holding an end portion of the light guide plate from the front of the light guide plate, the end portion being on a side of the end face from which light emitted from the light source portion enters.

Advantageous Effect of Invention

An image display device according to the present disclosure can reduce the occurrence of light leakage.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

(Underlying Knowledge Forming Basis of Present Disclosure)

The inventors of the present application have found that conventional image display devices pose problems as follows. Conventionally, an edge-light type backlight unit to which a light source portion (for example, a light emitting diode (LED) bar) is disposed along the upper side and the lower side of a light guide plate has been employed as a back light unit for an image display device, such as a liquid crystal television receiver. The light guide plate includes resin, such as acrylic resin, and expands and contracts due to the heat from a light emitting element, etc., or a change in the environmental temperature, for example.

In such a backlight unit that includes the guide light plate capable of expanding and contracting, a mold frame holds the periphery of the guide plate to prevent the guide plate from deforming.

FIG. 10is a cross sectional view illustrating a positional relationship between a conventional mold frame and a conventional light guide plate.

Specifically,FIG. 10is a cross sectional view outlining the upper structure of an image display device. As illustrated inFIG. 10, image display device200includes backlight unit210, rear frame220, mold frame230, and bezel240.

Backlight unit210is an edge-light type backlight device. Backlight unit210includes heat sink211, LED bar212, light guide plate213, and reflection sheet214. Heat sink211includes metal with high thermal conductivity, and recessed portion215for accommodating LED bar212in the upper front face of heat sink211. Light guide plate213is layered in front of heat sink211via reflection sheet214. LED bar212is provided with light emitting element216that faces the upper end face of light guide plate213. With this, light from light emitting element216enters light guide plate213from the upper end face of light guide plate213, is reflected by reflection sheet214, and exits from the front face of light guide plate213.

Rear frame220is a base plate which supports backlight unit210from the rear face side of backlight unit210. Rear frame220includes upper wall portion221through which screw hole222penetrates in the up-down direction. Bezel240is fastened to upper wall portion221with a screw that is screwed into screw hole222.

Mold frame230is a long frame that holds the entirety of the upper end portion of light guide plate213from the front face side of light guide plate213. Mold frame230includes: main body231disposed inwardly of and along upper wall portion221of rear frame220; and holder232that extends from main body231, and holds, using the end portion, the upper end portion of light guide plate213. Cushion member233is provided between the end portion of holder232and the upper end portion of light guide plate213. Main body231is provided with notch234for avoiding interference with screw250that is screwed into screw hole222.

Bezel240is a frame-shaped component which covers, from the front face side, mold frame230and the periphery of a liquid crystal cell (not shown in the drawings) which is supported by mold frame230. Bezel240includes through hole241coaxially formed with screw hole222in rear frame220. Bezel240is fixed to rear frame220with screw250screwed into screw hole222via through hole241.

Hereinafter, the case in which light guide plate213deforms due to heat from light emitting element216, etc., or a change in the environmental temperature, for example, will be described. Specifically, the case in which the upper end portion of light guide plate213bends toward the arrow Y10direction as shown inFIG. 10due to the deformation will be described. Mold frame230, bezel240, and rear frame220have spaces between one another due to tolerances. For this reason, when the upper end portion of light guide plate213bends toward the arrow Y10direction, holder232of mold frame230is pushed frontward, and thus the entirety of mold frame230turns toward the arrow Y11direction. The turn of mold frame230is noticeable since the portion in which notch234is provided is particularly fragile compared with the other portions of main body231. When mold frame230is turned, the upper end portion of light guide plate213remains deformed which results in creating a space between light guide plate213and reflection sheet214. Light that leaks from the space will be a cause of luminance irregularity.

In order to prevent mold frame230from turning due to such deformation of light guide plate213, it is conceivable that mold frame230is more firmly fixed to rear frame220. However, the use of such fixed structure takes up the space, thereby preventing the bezel from being narrowed.

The present disclosure is based on such knowledge, and as a result of conducting in-depth study, the inventors of the present application came up with the idea of a structure of an image display device which is capable of reducing the occurrence of light leakage by preventing a mold frame from turning while not preventing a bezel from being narrowed.

Hereinafter, embodiments will be described with reference to the drawings as appropriate. However, unnecessarily detailed descriptions may be omitted. For example, detailed descriptions on items already widely known and redundant descriptions regarding substantially the same configurations may be omitted. The purpose of the omission is to avoid unnecessary redundancy in the following descriptions, and to make the following descriptions readily understood by a person skilled in the art. In addition, the embodiments and the claims use expressions which indicate an orientation or a position of one or more objects, such as parallel, orthogonal, and uniformly spaced; however, these expressions include the case in which the one or more objects are not strictly facing the orientation or in the position. For example, the expression, parallel, not only indicates that things are perfectly in parallel with each other, but also indicates that the things are substantially parallel with each other. That is to say, the expression includes a difference of about several percent. The same applies to expressions, such as the same or uniform, which indicate the relation of two or more items of information or the relation of two or more objects.

Note that the drawings and the following description are provided in order that a person skilled in the art sufficiently understands the present disclosure, and thus are not intended to limit the subject matter of the claims.

In addition, for the convenience of describing the following embodiments, the Z-axis direction represents the up-down direction, the Y-axis direction represents the front-rear direction, and the X-axis direction represents the left-right direction (lateral direction) in the following embodiments. These associations of directions are not intended to limit the orientation of an image display device according to the present disclosure during the manufacturing processes or at the time of usage. In addition, the positive side of the X-axis indicates the direction at which an arrow of the X-axis is pointing, and the negative side of the X-axis indicates the direction opposite to the positive side of the X-axis. The same applies to the Y-axis direction and the Z-axis direction.

Hereinafter, embodiments will lie described with reference to FIG. throughFIG. 7. First, an overview of the configuration of an image display device according to the embodiments will be described with reference toFIG. 1andFIG. 2.

[11-1. Overall Configuration of Image Display Device]

First, the overall configuration of image display device2according to the embodiment will be described with reference toFIG. 1andFIG. 2.

FIG. 1is a perspective view illustrating a front face side of image display device2according to an embodiment.FIG. 2is an exploded perspective view illustrating display unit6of image display device2according to the embodiment.

As illustrated inFIG. 1, image display device2is a flat-panel display type liquid crystal television receiver, for example. Image display device2is provided with case4, display unit6that is disposed inside of case4, and stand8that supports case4.

As illustrated inFIG. 1, case4includes bezel10as a front cabinet, and a rear cabinet (not shown in the drawings). Bezel10has the shape of a quadrilateral frame, and covers the periphery of liquid crystal cell22from the front face side of image display device2. The rear cabinet covers rear frame12from the rear face side of image display device2, and is connected with bezel10.

As illustrated inFIG. 2, display unit6is provided with rear frame12, backlight unit14, a plurality of mold frames16a,16b,16c, and16d(16athrough16d), a plurality of optical sheets18a,18b,18c, and18d(18athrough18d), and liquid crystal cell22(an example of a display panel).

Rear frame12is a metal base plate for supporting backlight unit14from the rear face side of image display device2. Rear frame12includes a bumpy portion for improving rigidity of rear frame12, and a plurality of screw holes for fixing various kinds of components to rear frame12.

Backlight unit14is an edge light type backlight device in the embodiment. Backlight unit14includes heat sinks32aand32b, LED bars34aand34b, light guide plate36, and reflection sheet38.

Heat sinks32aand32beach include metal with high thermal conductivity; such as aluminum. LED bars34aand34beach are an example of a light source portion, and include a plurality of light emitting elements341(seeFIG. 3). Each of the plurality of light emitting elements341is an LED element in which an LED chip is packaged, for example. In addition, the LED bars (34aand34b) are disposed at both the top and the bottom of light guide plate36. Specifically, LED bar34ais disposed on the upper side of light guide plate36(the positive side of the Z-axis), and LED bar34bis disposed on the lower side of light guide plate36(the negative side of the Z-axis).

LED bar34ais attached to heat sink32ausing, for example, an adhesive double-sided tape with high thermal conductivity, and LED bar34bis attached to heat sink3busing, for example, an adhesive double-sided tape with high thermal conductivity. Heat sinks32aand3bare fixed to rear frame12with a plurality of screws, and thus LED bars34aand34bare also fixed to rear frame12.

Light guide plate36is formed in the shape of a quadrilateral plate in a planar view. Light guide plate36is supported by rear frame12. Light guide plate36is an injection molded acrylic resin, for example. The upper end face of light guide plate36is disposed facing LED bar34a. Light from the plurality of LED elements in LED bar34aenter light guide plate36from the upper end face of light guide plate36. In addition, the lower end face of light guide plate36is disposed facing LED bar34b. Light from the plurality of light emitting elements341in LED bar34benter light guide plate36from the lower end face of light guide plate36.

Reflection sheet38covers the rear face of light guide plate36. Reflection sheet38reflects, frontward, light that has entered from both the upper end face and the lower end face of light guide plate36. Light reflected by reflection sheet38exits from the front face of light guide plate36, and enters liquid crystal cell22from the rear face (the face opposite display surface60which will be described later).

As illustrated inFIG. 2, the plurality of mold frames16athrough16dare frames which include resin and have an elongated shape. It is to be noted that mold frames16athrough16dwhich include resin are exemplified as an example of a frame here, but the frame may include metal.

The plurality of mold frames16a,16b,16c, and16dare attached to the upper end portion, the lower end portion, the right end portion (the end portion on the positive side of the X-axis), and the left end portion (the end portion on the negative side of the X-axis) of rear frame12, respectively. That is to say, the plurality of mold frames16athrough16dare disposed along the periphery of light guide plate36in the shape of a quadrilateral frame. The plurality of mold frames16athrough16dare disposed so as to hold the periphery of light guide plate36from the front face of light guide plate36via cushion member190(seeFIG. 3).

As illustrated inFIG. 2, the plurality of optical sheets18a,18b,18c, and18dare disposed next to one another in the stated order between liquid crystal cell22and light guide plate36. Optical sheet18ais a diffusion sheet for diffusing light that has exited from the front face of light guide plate36. Optical sheets18band18care prism sheets for condensing, on the rear face of liquid crystal cell22, the light that has exited from the front face of light guide plate36. Optical sheet18dis a reflective polarization sheet (the so-called dual brightness enhancement film (DBEF) sheet) for polarizing the light that has exited from the front face of light guide plate36. The upper end portions (periphery) of the plurality of optical sheets18athrough18dare supported by mold frame16a, and the lower end portions (periphery) of the plurality of optical sheets18athrough18dare supported by mold frame16b.

Liquid crystal cell22is formed in the shape of a quadrilateral plate in a planar view. The front face of liquid crystal cell22includes display surface60for displaying an image. The periphery of liquid crystal cell22is supported by the plurality of mold frames16athrough16dvia cushion member190.

Bezel10is formed in the shape of a quadrilateral frame, and is disposed so as to cover the periphery of display surface60of liquid crystal cell22. Bezel10is attached to rear frame12with screw150(seeFIG. 3), for example.

[1-2. Upper Structure of Image Display Device]

Next, the upper structure of image display device2will be described in detail.FIG. 3is a cross sectional view illustrating the upper structure of image display device2according to the embodiment. InFIG. 3, the plurality of optical sheets18a,18b,18c, and18d, and liquid crystal cell22are not illustrated.

As illustrated inFIG. 3, rear frame12is provided with rear plate121having a quadrilateral shape in a planar view, and upper wall portion122extending frontward from the upper end portion of rear plate121. On the upper portion of rear plate121, heat sink32ais fixed spaced apart from upper wall portion122. On the front face of heat sink32a, light guide plate36is attached via reflection sheet38. Recessed portion321is provided on the upper front side of heat sink32a. In recessed portion321, LED bar34ais attached such that light from light emitting element341enters from the upper end face that is an end face of light guide plate36.

Upper wall portion122is an example of a wall portion of rear frame12. Although not illustrated, rear frame12includes other wall portions such as a lower wall portion provided at the lower end portion of rear plate121, a left wall portion provided at the left end portion of rear plate121, and a right wall portion provided at the right end portion of rear plate121, for example.

Upper wall portion122includes screw hole123that penetrates upper wall portion122in the up-down direction. Bezel10is fastened with a screw which is screwed into screw hole123. Bezel10is provided with upper cover101which covers the upper end portion of mold frame16aand the upper end portion of liquid crystal cell22from the front of display device2, and fixed piece102which extends rearward from the rear face of upper cover101. Upper cover101is long in the left-right direction, and fixed piece102is also long along the entirety of upper cover101. Fixed piece102is disposed above upper wall portion122of rear frame12. Fixed piece102includes through hole103coaxially disposed with screw hole123in rear frame12. Bezel10is fixed to rear frame12with screw150screwed into screw hole123via through hole103.

Next, the structure of mold frame16awhich is disposed at the upper portion of image display device2will be described in detail.FIG. 4is a top view illustrating the entirety of mold frame16aaccording to the embodiment. As illustrated inFIG. 4, mold frame16ais a component that is long in the left-right direction. Mold frame16aincludes a plurality of engagement portions161to be engaged with rear frame12, and a plurality of notches162for avoiding interference with screw150. The plurality of engagement portions161and the plurality of notches162are disposed spaced apart at fixed intervals in the longitudinal direction. Specifically, mold frame16aincludes eight engagement portions161, and ten notches162. Mold frame16aincludes slit163on each side of engage portion161. Slit163allows engagement portion161to readily bend. Engagement portion161includes engagement hole159onto which a portion of rear frame12is hooked. In order to attach mold frame16ato rear frame12, engagement portion161is bent to hook the portion of rear frame12onto engagement hole159so that engagement portion161is engaged with rear frame12.

FIG. 5is an enlarged view illustrating a portion inside of circle C in mold frame16ainFIG. 4.FIG. 6is a cross sectional view illustrating mold frame16ataken along the line VI-VI inFIG. 5.FIG. 7is a cross sectional view illustrating mold frame16ataken along the line VII-VII inFIG. 5.

As illustrated inFIG. 5throughFIG. 7, mold frame16aintegrally includes main body164, and holder165which extends downward from the middle position in the front-rear direction of main body164. Main body164is disposed inwardly of, and along upper wall portion122. Specifically, main body164includes rear portion166which is disposed behind holder165, and front portion167which is disposed in front of holder165.

Rear portion166is located below engagement portion161. In addition, rear portion166includes notch162which is long in the front-rear direction and has an open rear end portion. A pair of ribs168is formed on the bottom face of rear portion166so as to sandwich notch162. Rib168is an example of a second protrusion, and is a protrusion long in the front-rear direction. It is to be noted that although not illustrated, a plurality of ribs are disposed spaced apart at fixed intervals in the left-right direction, other than near notch162. However, protrusion amount h by which rib168protrudes and which is disposed near notch162is greater than the protrusion amount of the other ribs. This enables rib168to reinforce a portion which is fragile due to the presence of notch162.

In front portion167, recessed portion169is formed in a position corresponding to notch162. Broken line L1inFIG. 5illustrates the outside shape of upper wall portion122. Upper wall portion122includes a portion that has a protruding shape protruding frontward, and is disposed inside of recessed portion169. In recessed portion169in front portion167, or in other words, in a position facing the portion in upper wall portion122, first protrusion170which protrudes toward the portion is provided. That is to say, first protrusion170protrudes above the top face of rear portion166. First protrusion170protrudes from the top face of rear portion166by protrusion amount H.

From main body164, holder165extends in the shape of a crank. Specifically, main body164includes: base portion171which extends downward from main body164; intermediate portion172which extends rearward from an end of base portion171; and end portion173which extends downward from an end of intermediate portion172. Accordingly, end portion173is disposed behind base portion171. Cushion member190(seeFIG. 3) in the shape of a sheet is attached to the rear face of end portion173.

When mold frame16ais attached to rear frame12as illustrated inFIG. 3, rear portion166of main body164is disposed below upper wall portion122, and between upper wall portion122and heat sink32a. That is to say, heat sink32ais disposed on a side opposite a side of rear portion166facing upper wall portion122. In addition, rib168below rear portion166is in contact with the upper end portion of heat sink32a.

Meanwhile, an end portion of upper wall portion122is disposed inside of recessed portion169in front portion167. Accordingly, first protrusion170in recessed portion169is in contact with the end portion of upper wall portion122. Here, protrusion amount H by which first protrusion170protrudes is greater than space H1between rear portion166and upper wall portion122in the direction in which rear portion166and upper wall portion122are aligned (the Z-axis direction). When first protrusion170and the end portion of upper wall portion122are in contact with each other, the end portion presses first protrusion170, and thus a downward force is applied to front portion167. For example, broken line L2inFIG. 3illustrates a state of mold frame16awhen there is no light guide plate36. As broken line L2illustrates, when upper wall portion122presses first protrusion170, holder165turns and inclines rearward when there is no light guide plate36. Due to the inclination, end portion173of holder165will be located rearward compared with the state in which end portion173holds light guide plate36. It is to be noted that since an end of rear portion166is in contact with rear plate121of rear frame12, holder165inclines using the end of rear portion as the fulcrum.

Actually, end portion173of holder165holds the upper end portion of light guide plate36via cushion member190from the front of light guide plate36. The inclination of holder165is eventually corrected because holder165receives a reaction force from light guide plate36. That is to say, the entirety of mold frame16aelastically deforms, and is redisposed in a normal position. In this state, upper wall portion122restricts first protrusion170to move upward, and the upper end portion of light guide plate36restricts holder165to move rearward. Accordingly, an elastic restoring force produced by mold frame16aacts on upper wall portion122and the upper end portion of light guide plate36. Specifically, an upward force (arrow Y1inFIG. 3) acts on upper wall portion122, and a rearward force (arrow Y2inFIG. 3) acts on the upper end portion of light guide plate36. This prevents the deformation of the upper end portion of light guide plate36as a result of receiving the rearward force from holder165, although the upper end portion of light guide plate36may bend frontward under an influence of heat, for example. Therefore, it is possible to prevent the turn (arrow Y3inFIG. 3) of mold frame16adue to the deformation of light guide plate36. In addition, prevention of the deformation of the upper end portion of light guide plate36keeps light guide plate36and reflection sheet38in contact with each other. In other words, light guide plate36and reflection sheet38are not readily spaced apart, thereby preventing an occurrence of light leakage from a space between light guide plate36and reflection sheet38.

It is to be noted that since rib168below rear portion166is in contact with the upper end portion of heat sink32a, the turn of mold frame16acan be more reliably restricted by rib168. As such, rib168can also stably hold mold frame16ain the normal position, and can more reliably prevent the deformation of the upper end portion of light guide plate36.

As has been described above, image display device2according to the embodiment includes: a light source portion (LED bar34a); light guide plate36in a shape of a quadrilateral which includes an end face from which light emitted from the light source portion enters and an front face from which the light exits; heat sink32athat holds the light source portion and light guide plate36; a base plate (rear frame12) which accommodates the light source portion, light guide plate36, and heat sink32a; and a frame (mold frame16a) that holds light guide plate36from front of light guide plate36in a state in which the frame is fixed to a wall portion (upper wall portion122) of rear frame12. Mold frame16aincludes: main body164disposed inwardly of and along the wall portion; and holder165extending from main body164. Holder165holds an end portion (upper end portion) of light guide plate36from the front of light guide plate36. The end portion is on a side of the end face from which light emitted from the light source portion enters. Holder165presses the end portion of the light guide plate in the elastically deformed state.

Accordingly, since holder165presses the end portion of light guide plate36in the elastically deformed state, an elastic restoring force produced by holder165acts on the upper end portion of light guide plate36. This presses the upper end portion of light guide plate36rearward, thereby preventing the deformation of light guide plate36. Therefore, it is possible to prevent the turn of mold frame16adue to the deformation of light guide plate36, and thereby prevents an occurrence of light leakage.

With such mold frame16a, the turn of mold frame16acan be prevented without separately using a fixed structure for firmly fixing mold frame16a. That is to say, since a setting space for the fixed structure need not be provided, bezel10is not prevented from being narrowed.

In addition, main body164includes front portion167in which first protrusion170faces the wall portion (upper wall portion122). Front portion167is in front of holder165. Protrusion amount H by which first protrusion170protrudes is greater than space H1between rear portion166of main body164and the wall portion in a direction in which rear portion166and the wall portion are aligned. Rear portion166is behind holder165.

Accordingly, since protrusion amount H by which first protrusion170protrudes is greater than space H1between rear portion166and upper wall portion122, first protrusion170surely comes into contact with upper wall portion122. When first protrusion170and upper wall portion122are in contact with each other, upper wall portion122presses first protrusion170, and a downward force is applied to front portion167. That is to say, since a force in a direction opposite the arrow Y3direction acts on mold frame16a, holder165inclines rearward and holds the upper end portion of light guide plate36rearward. This makes it possible to prevent the deformation of the upper end portion of light guide plate36.

In addition, even if a force produced due to the deformation of the upper end portion of light guide plate36acts on holder165, it is possible to reliably control the turn of mold frame16ain the arrow Y3direction, since first protrusion170and upper wall portion122are in contact with each other.

Furthermore, first protrusion170is provided in a position corresponding to notch162provided in rear portion166.

As has been described above, a portion in mold frame16awhere notch162is present is more fragile than the other portions in mold frame16a. That is to say, a portion near notch162in mold frame16ais likely to be deformed compared with the other portions in mold frame16a. When first protrusion170is provided in the position corresponding to notch162, it is possible to control a portion which is likely to be deformed and to reliably prevent the deformation of the portion. Therefore, holder165of mold frame16acan more firmly press the upper end portion of light guide plate36, and can reliably prevent the deformation of light guide plate36.

In addition, heat sink32ais disposed on a side opposite a side of rear portion166facing the wall portion (upper wall portion122), and main body164includes a second protrusion (rib168) below a surface of rear portion166facing heat sink32a.

This enables rib168to come into contact with the upper end portion of heat sink32a. When rib168and the upper end portion of heat sink32aare in contact with each other, it is possible for rib168to more reliably control the turn of mold frame16a.

Furthermore, the second protrusion (rib168) is provided near notch162provided in rear portion166.

As has been described above, a portion near notch162in mold frame16ais likely to be deformed compared with the other portions in mold frame16a. When rib168is provided near notch162, it is possible to control a portion which is likely to be deformed and to reliably prevent the deformation of the portion. Therefore, holder165of mold frame16acan more firmly press the upper end portion of light guide plate36, and can reliably prevent the deformation of light guide plate36.

The above embodiment has exemplified the case in which the provision of first protrusion170in mold frame16aenables holder165to press the upper end portion of light guide plate36. However, so long as holder165is capable of pressing the upper end portion of light guide plate36, mold frame16amay be configured in any way. Variation 1 describes the case in which holder165presses the upper end portion of light guide plate36using a first protrusion provided in upper wall portion122of rear frame12.

FIG. 8is a cross sectional view illustrating an upper structure of image display device2A according to Variation 1. Specifically,FIG. 8is a diagram that corresponds toFIG. 3. Hereinafter, it is to be noted that the same reference signs are given to elements that are identical with the elements described in the above embodiment, and redundant descriptions may be omitted.

As illustrated inFIG. 8, the inside of recessed portion169ain mold frame16a1is not protruded, and the inside of recessed portion169ais substantially flush with the top face of rear portion166. Meanwhile, a portion of upper wall portion122aof rear frame12ais disposed inside of recessed portion169a. In a position facing the portion of upper wall portion122ain recessed portion169a, first protrusion170ais provided. First protrusion170aprotrudes more compared with the other portions in upper wall portion122a. First protrusion170ais protruding by protrusion amount H from the bottom face of upper wall portion122a. Protrusion amount H is greater than space H1. Accordingly first protrusion170apresses front portion167a, and a downward force is applied to front portion167a. Thus, when first protrusion170apresses front portion167a, holder165turns and inclines rearward. Broken line L3inFIG. 8illustrates a state of holder165without light guide plate36. Due to the inclination, end portion173of holder165will be located rearward compared with the state in which end portion173holds light guide plate36. That is to say, when holder165is holding the upper end portion of light guide plate36, holder165is in the elastically deformed state due to a reaction force from light guide plate36. Meanwhile, a press force caused by an elastic restoring force which is produced by holder165acts on the upper end portion of light guide plate36, thereby preventing the deformation of light guide plate36.

It is to be noted that a first protrusion may be divided to be provided for a mold frame and a rear frame. Specifically, first protrusions are provided butted up against each other, each in the front portion of the mold frame and the upper wall portion of the rear frame. In this case, a value obtained by combining the protrusion amount by which the first protrusion protrudes on the front portion side and the protrusion amount by which the first protrusion protrudes on the upper wall portion side is to be greater than space H1.

Variation 2 describes the case in which a holder that is located behind the predetermined normal position presses the upper end portion of light guide plate36after assembly.

FIG. 9is a cross sectional view illustrating mold frame16a2according to Variation 2. Specifically,FIG. 9is a diagram that corresponds withFIG. 7.

As illustrated inFIG. 9, the inside of recessed portion169bin mold frame16a2is not protruded, and the inside of recessed portion169bis substantially flush with the top face of rear portion166. Here, broken line L4inFIG. 9illustrates the installation position of holder165bafter assembly. This installation position is the normal position of holder165b. Before the assembly, holder165bis located behind the normal position. Specifically, base portion171bof holder165binclines relative to the up-down direction such that base portion171bof holder165bmakes an acute angle with rear portion166of main body164. Accordingly, end portion173bof holder165bis located behind the normal position.

After the assembly, end portion1731of holder165bholds the upper end portion of light guide plate36via cushion member190from the front of light guide plate36. Holder165bis disposed in the normal position in the elastically deformed state due to a reaction force from light guide plate36. In this state, an elastic restoring force produced by mold frame16a2acts on the upper end portion of light guide plate36. This prevents the deformation of the upper end portion of light guide plate36as a result of receiving a rearward force from holder165, although the upper end portion of light guide plate36may bend frontward under an influence of heat, for example.

Other Embodiment

The embodiments have been described as above to exemplify technique that is disclosed in the present application. However, the technique disclosed in the present disclosure is not limited to the above embodiments, and is applicable to embodiments to which changes, replacements, additions, omissions, etc. have been suitably made. In addition, it is also possible to combine each of the structural elements described in the above embodiments to come up with other embodiments. Thus, other embodiments will be exemplified as follows.

For example, the above embodiments have exemplified the case in which distinctive configurations according to the present disclosure are used for mold frame16athat is disposed in the upper portion of image display device2. However, it is also possible to use the distinctive configurations according to the present disclosure for mold frame16bdisposed at the lower portion of image display device2, mold frame16cdisposed on the right side of image display device2, and mold frame16ddisposed on the left side of image display device2. It is to be noted that when mold frames16cand16d, which are disposed on the right side and the left side, respectively, are used, a light source portion is to be placed on each of the left end face and the right end face of light guide plate36so that light enters through the left end face and the right end face of light guide plate36.

In addition, the above embodiments have exemplified, as an example of a second protrusion, rib168which is the protrusion long in the front-rear direction. However, so long as the second protrusion can control the turn of mold frame16a, mold frame16acan have any other shape. For example, the second protrusion can have the shape of a dot-like projection.

Furthermore, image display device2according to the embodiments can be realized as, for example, a liquid crystal television receiver. However, the configuration of image display device2may be applied to displays for personal computers and mobile terminals, such as tablet terminals, smartphones, etc., for example.

The above has described the embodiments to exemplify the technique according to the present disclosure. The drawings and detailed descriptions are provided for this purpose.

Therefore, the drawings and the detailed descriptions may include, among the structural elements essential for addressing issues, a structural element which is not essential for addressing the issues. Thus, those non-essential structural elements should not be immediately considered as necessary because they are illustrated in the drawings and described in detail.

In addition, since above embodiments are for exemplifying the technique according to the present disclosure, various changes, replacements, additions, omissions, etc. can be made in the claims and in other equivalent areas.

INDUSTRIAL APPLICABILITY

The present disclosure is applicable to an image display device for displaying an image. Specifically, the present disclosure is applicable to a television receiver, a display, digital signage, a tablet terminal, a smartphone, and a table-type display device.

REFERENCE MARKS IN THE DRAWINGS

2,2A image display device

22liquid crystal cell

36light guide plate

122,122aupper wall portion

h, H protrusion amount