KR20000035386A - Surface light source device of side light type and liquid crystal display - Google Patents

Abstract

PURPOSE: A sheet light source apparatus is provided to be easy to manufacture a frame by shaping respective parts of the frame separately. CONSTITUTION: A sheet light source apparatus comprises a frame(2) which consists of first and second support frames(14,15), side frames(16a,16b), LCD panel unit mounting members(17a,17b) and an auxiliary frame(18). The LCD panel unit mounting members(17a,17b) are mounted at each of the side frames(16a,16b). An elastic member(21) of a plate shape is mounted at a bottom face(14a) of the support frame(14), and a click(20) is projected from a back plane(14b) of the support frame(14). A lower section(22a) of a cover(22) is fitted between the click(20) and the back plane(14b) of the support frame(14). Ends of the side frames(16a,16b) are fixed at the first support frame(14), and the other ends of the side frames(16a,16b) are fixed at the second support frame(15). The LCD panel unit mounting members(17a,17b) and the auxiliary frame(18) are fixed at the side frames(16a,16b).

Description

Side light type surface light source device and liquid crystal display device {SURFACE LIGHT SOURCE DEVICE OF SIDE LIGHT TYPE AND LIQUID CRYSTAL DISPLAY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side light type light source device and a liquid crystal display device. More particularly, the present invention relates to a device for improving the frame for accommodating all members constituting these devices.

It is known to illuminate a liquid crystal display panel of a liquid crystal display device with a side light type surface light source device. In general, the side light type surface light source device includes a light guide plate and a primary light source for supplying primary light thereto. A rod-shaped fluorescent lamp (cold cathode tube) is known as a typical primary light source. The primary light source is disposed along the incident cross section of the light guide plate.

In most cases, the side light type surface light source device includes sheet members such as a prism sheet, a diffusion sheet, and a protective sheet in addition to these light guide plates and primary light sources. All these members are accommodated in the same frame in the form accommodated in a predetermined frame, and the side light type surface light source device is comprised. Adding a unit including a liquid crystal display panel constitutes a liquid crystal display device.

The liquid crystal display device using such a side light type surface light source device has the general advantage of not increasing the thickness of the device, and is particularly used for displays such as portable personal computers.

In recent years, in such portable devices, there is an increasing demand for thinning and lightening the entire apparatus including a display. Accordingly, efforts have been made to reduce the weight and thickness of the liquid crystal display constituting the display, particularly the side light type surface light source device used for illumination of the liquid crystal display panel.

10 shows a typical structure of a side light type surface light source device conventionally applied to a liquid crystal display device. Moreover, the frame used there is shown in FIG. 11 by the top view.

Referring to FIG. 10, the side light type surface light source device 60 includes a rectangular reflective sheet 62, a light guide plate 63, a diffusion sheet 64, two prism sheets 65 and 66, and a protective sheet 67. ). These members are overlapped and accommodated in the frame (frame) 61 formed from synthetic resins, such as polycarbonate, sequentially.

On the side of the light guide plate 63, rod-shaped light sources 68 such as cold cathode tubes are housed as primary light sources.

The two prism sheets 65 and 66 correct the directivity of the illumination light which is preferentially emitted from the light guide plate 63 in an oblique manner, so that the illumination light is mostly directed in the front direction (upward in FIG. 10). In this example, the prism formation directions of the prism sheets 65 and 66 are perpendicular to each other. Moreover, when the liquid crystal display panel 70 of a liquid crystal display panel unit is arrange | positioned on the protective sheet 67 superimposed, a liquid crystal display device is comprised.

When the rod-shaped light source 68 is turned on, light enters therein from the side surface of the light guide plate 63. This light is then emitted from the surface (emission surface) of the light guide plate 63 gradually while propagating inside the light guide plate 63. This output light is again supplied to the liquid crystal display panel 70 via the diffusion sheet 64, the prism sheets 65 and 66, and the protective sheet 67.

In order to reduce the weight and thickness of the side light type surface light source device 60, a frame as shown in Fig. 11 is used. The frame 61 is an integral molded product obtained by applying injection molding and is punched into a thin, thin and complicated shape. Therefore, the manufacture of the metal mold | die required at the time of shaping | molding requires high skill, and the manufacturing cost of metal mold | die raises, and also the price of the apparatus 60 itself raises. Moreover, in some cases, it may cause difficulty in the manufacture of the mold from which the required molded body is obtained.

As a solution to such a situation, there has already been proposed a technique of preparing a plastic bracket having a mounting portion for external fixing and fixing it to a side surface of the light guide plate with an adhesive material such as a double-sided tape (Japanese Patent Laid-Open No. 10-A). 96921). However, it has been pointed out that such a prior art may cause a new problem that light leaks from the portion of the adhesive material for fixing the bracket.

SUMMARY OF THE INVENTION The present invention has been proposed under the above-mentioned background, and an object thereof is to provide a side light type surface light source device using a frame that is easy to manufacture and that does not incur a cost increase associated with mold manufacturing, and to apply the same to lighting of a liquid crystal display panel. It is to provide a liquid crystal display device.

1 is an exploded perspective view showing the main part of a side light type surface light source device according to a first embodiment of the present invention.

2 is a plan view of a frame employed in the surface light source device of the first embodiment.

3 is a cross-sectional view showing an assembled state of the surface light source device of the first embodiment.

Fig. 4 is an exploded perspective view showing the main parts of the side light type surface light source device according to the second embodiment of the present invention.

5 is a plan view of a frame employed in the surface light source device of the second embodiment.

Fig. 6 is a sectional view showing the assembled state of the surface light source device of the second embodiment.

7 is a plan view of a light guide plate employed in the surface light source device of the second embodiment.

8 is a partially exploded perspective view of a frame showing an application example of the second embodiment of the present invention.

9A and 9B are perspective views showing a modification of the primary light source, FIG. 9A shows a first modification, and FIG. 9B shows a second modification.

10 is a cross-sectional view showing an assembled state of a side light type surface light source device of the prior art.

11 is a plan view of a frame used in the prior art.

※ Explanation of code about main part of drawing ※

1, 31: side light type surface light source device 2: frame

3: reflection sheet 4, 33: light guide plate

5: diffusion sheet 6: first prism sheet

7 second prism sheet 10 rod-shaped light source

11 Reflector 12 Liquid Crystal Display Panel

13 liquid crystal display device 14 first support frame

15, 36: 2nd support frame 16a, 16b: side frame

17a, 17b: liquid crystal display panel unit mounting member 18: auxiliary frame

28 panel support part 38 support frame mounting projection

40: frame mounting protrusion 52, 54: point light source

37a, 37b: side frame (frame for mounting LCD panel unit)

First, the present invention sequentially accommodates at least a rectangular reflective sheet, a light guide plate, and a prism sheet in a frame, and receives a primary light source on the side of the incident end surface of the light guide plate. The light source may be applied to a side light type surface light source device for supplying light to the liquid crystal display panel of the liquid crystal display panel unit superimposed on the prism sheet through the light guide plate and the prism sheet.

According to one aspect (claim 1) of the present invention, the frame of the side light type surface light source device supports one primary side of the reflective sheet, the light guide plate and the prism sheet and simultaneously supports the primary light source. A first support frame;

A second support frame for supporting the other end side of the reflective sheet, the light guide plate and the prism sheet;

Side frames disposed on respective side surfaces adjacent to the incident end surface of the light guide plate to connect and fix the first support frame and the second support frame;

A frame assembly fixed to the side frame may be divided into a liquid crystal display panel unit mounting member for supporting the liquid crystal display panel.

According to such a structure, a thin frame can be divided | segmented into a some component and shape | molded. In addition, the molding of the frame becomes easy, and at the same time, the mold for forming the frame is miniaturized, and the production of the mold is facilitated.

Therefore, the cost reduction of the side light type surface light source device can be achieved. Moreover, since it is not the structure which fixes a frame to an light guide plate with an adhesive material, light leakage by use of an adhesive material is prevented.

In addition, since the frame and the liquid crystal display panel unit mounting member are divided, the liquid crystal display panel unit mounting member can be used as a common component even if the size of the liquid crystal display panel changes.

Next, the present invention, in the frame, at least a rectangular reflective sheet, a light guide plate, and a prism sheet are sequentially superposed and accommodated, and at the same time, the primary light for supplying light toward the incidence end face toward the side of the incidence end face of the light guide plate. A circle is accommodated, the liquid crystal display panel of the liquid crystal display panel unit is disposed on the prism sheet, and the liquid crystal display panel unit is mounted on the frame, and the light of the primary light source is passed through the light guide plate and the prism sheet. It can be applied to the liquid crystal display device supplied to the liquid crystal display panel.

According to one aspect (claim 2) of the present invention applied to a liquid crystal display device, the frame supports a first side of the primary light source while supporting one side of the reflective sheet, the light guide plate, and the prism sheet. Frame and;

A second support frame for supporting the other end side of the reflective sheet, the light guide plate and the prism sheet;

Side frames disposed on respective side surfaces adjacent to the incident end surface of the light guide plate to connect and fix the first support frame and the second support frame;

The assembly may be divided into a liquid crystal display panel unit mounting member fixed to the side frame to support the liquid crystal display panel.

The liquid crystal display device having this configuration has an advantage that is roughly equivalent to the above embodiment. That is, the thin frame can be divided into a plurality of parts and molded. In addition, the molding of the frame becomes easy, and at the same time, the mold for forming the frame is miniaturized, and the production of the mold is facilitated.

Therefore, the price of the liquid crystal display device can be reduced. Moreover, since it is not the structure which fixes a frame to an light guide plate with an adhesive material, light leakage by use of an adhesive material is prevented and a bright display is obtained.

In addition, since the frame and the liquid crystal display panel unit mounting member are divided, the liquid crystal display panel unit mounting member can be used as a common component even if the size of the liquid crystal display panel is changed.

According to another aspect of the invention (claim 3) applied to a side light type surface light source device, the frame supports the primary light source while simultaneously supporting one side of the reflective sheet, the light guide plate, and the prism sheet. A first support frame;

A second support frame for supporting the other end side of the reflective sheet, the light guide plate and the prism sheet;

An assembly which is disposed at each side surface adjacent to the incident end surface of the light guide plate, and which may be divided into a side frame supporting the liquid crystal display panel unit while fixing and fixing the first and second support frames; It consists.

According to this aspect, the number of parts can be reduced compared with the above aspect (claim 1) while maintaining the advantages of the above aspect (claim 1).

The same form may be employed in the liquid crystal display device (claim 4). In that case, the frame may include: a first support frame supporting one end of the reflective sheet, the light guide plate, and the prism sheet and supporting the primary light source;

A second support frame for supporting the other end side of the reflective sheet, the light guide plate and the prism sheet;

A frame assembly disposed on each side surface adjacent to the incident end surface of the light guide plate, the frame assembly being divided into side frames supporting the liquid crystal display panel unit at the same time as fixing the first support frame and the second support frame; Consists of.

This aspect makes it possible to reduce the number of parts compared to the above aspect (claim 2) while maintaining the advantages of the above-described liquid crystal display device (claim 2).

This invention also provides the form (claim 5-Claim 8) which prescribed | regulated more detail.

First, in claim 5, the primary light source is arranged on the side of the incidence end surface of the rectangular light guide plate, the prism sheet is arranged along the exit surface of the light guide plate, the reflective sheet is disposed along the back surface of the light guide plate, and the incident cross section For the side light type surface light source device for emitting the light of the primary light source inserted into the light guide plate from the toward the liquid crystal display panel of the liquid crystal display panel unit disposed on the prism sheet through the prism sheet, Provisions are provided.

That is, with respect to the coplanar light source device, a frame mounting protrusion is formed on each side adjacent to the incident end surface, and a frame for mounting a liquid crystal display panel unit is attached to the frame mounting protrusion,

A first support frame for supporting the primary light source and supporting one side of the reflective sheet, the light guide plate, and the prism sheet is fixed to one end of the frame for mounting the liquid crystal display panel unit, Each frame mounting protrusion is formed near both ends of the opposite end surface,

It is prescribed to bind the second supporting frame for supporting the other end side of the reflective sheet to the frame mounting protrusion.

Here, binding means screwing members, or elastically sandwiching another member with the elastic member of one member, and fixing it.

According to this aspect, in the same manner as in claim 1, since the frame is disassembled into a plurality of parts to facilitate the molding of the frame, the production cost of the mold can be reduced, thereby providing an inexpensive side light type surface light source device. It becomes possible to provide. In addition, the frame can be fixed to the light guide plate having high rigidity, thereby increasing the rigidity of the frame itself.

The method according to claim 6, wherein the primary light source is arranged on the side of the incidence end surface of the rectangular light guide plate, the prism sheet is arranged along the exit surface of the light guide plate, and the liquid crystal display panel of the liquid crystal display panel unit is disposed through the prism sheet, A liquid crystal display panel unit, wherein a reflection sheet is disposed along a rear surface of the light guide plate, and light of the primary light source, which is inserted into the light guide plate from the incident end surface, is disposed on the prism sheet from the exit surface through the prism sheet; For the liquid crystal display device emitted toward the display panel, the following provision is provided.

That is, the support frame mounting projections are respectively formed on each side surface adjacent to the incident end surface,

A liquid crystal display panel unit mounting frame is attached to the support frame mounting protrusion,

A first support frame for supporting the primary light source and one end of the reflective sheet, the light guide plate, and the prism sheet is fixed to one end of the frame for mounting the liquid crystal display panel unit,

Frame mounting protrusions are formed in the vicinity of both ends of the distal end of the opposite side of the incident section,

It is prescribed to bind the second supporting frame for supporting the other end side of the reflective sheet to the frame mounting protrusion.

As described above, the binding means to fix the members by screwing the members together or by elastically sandwiching the other members with the elastic members of one member.

In such a configuration, as in the case of claim 2, since the frame is disassembled into a plurality of parts to facilitate the molding of the frame, the manufacturing cost of the metal mold can be reduced, thereby providing an inexpensive liquid crystal display device. Become. The frame can be fixed to a light guide plate having high rigidity, and the rigidity of the frame itself can be increased.

The method according to claim 7, wherein the primary light source is arranged on the side of the incidence end surface of the rectangular light guide plate, the prism sheet is arranged along the exit surface of the light guide plate, the reflective sheet is arranged along the back surface of the light guide plate, and the Regarding the side light type surface light source device for emitting the light of the primary light source placed in the light guide plate toward the liquid crystal display panel of the liquid crystal display panel unit disposed on the prism sheet from the exit surface through the prism sheet, This is provided.

That is, with respect to the coplanar light source device, frame mounting protrusions are formed on respective side surfaces adjacent to the incident end surface, and a frame for mounting a liquid crystal display panel unit is attached to the frame mounting protrusion,

Fixing a first support frame to one end of the frame for mounting the liquid crystal display panel unit, while supporting the primary light source and supporting one end of the reflective sheet, the light guide plate, and the prism sheet;

On the other end side of the frame for attaching the liquid crystal display panel unit, it is prescribed to fix the second support frame for supporting the other end side of the reflective sheet, the light guide plate and the prism sheet.

According to such a structure, compared with the structure (claim 5) which fixes a 2nd support frame to a light guide plate, it becomes possible to simplify the shape of a light guide plate.

The same advantages are also obtained in the liquid crystal display device defined by claim 8. That is, in claim 8, the primary light source is arranged on the side of the incident end surface of the rectangular light guide plate,

A prism sheet is disposed along an exit surface of the light guide plate, a liquid crystal display panel of a liquid crystal display panel unit is disposed through the prism sheet, a reflective sheet is disposed along a rear surface of the light guide plate, and is placed in the light guide plate from the incident end surface. The following provisions are provided for a liquid crystal display device which emits the light of the primary light source toward the liquid crystal display panel of the liquid crystal display panel unit disposed on the prism sheet from the emission surface via the prism sheet.

That is, with respect to the liquid crystal display device, frame mounting protrusions are formed on respective side surfaces adjacent to the incident end surface, respectively.

Attaching a frame for mounting a liquid crystal display panel unit to the frame mounting protrusion,

Fixing a first support frame to one end of the frame for mounting the liquid crystal display panel unit, while supporting the primary light source and supporting one end of the reflective sheet, the light guide plate, and the prism sheet.

It is prescribed to fix the second supporting frame supporting the other end side of the reflective sheet, the light guide plate and the prism sheet to the other end side of the frame for mounting the liquid crystal display panel unit.

The liquid crystal display device of this embodiment can simplify the shape of the light guide plate as compared with the liquid crystal display device defined in claim 6 which fixes the second supporting frame to the light guide plate.

Embodiment

(First embodiment)

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described with reference to drawings. First, a first embodiment will be described with reference to FIGS. 1 to 3. 1, the principal part of the side light type surface light source device which concerns on a 1st Example is shown in exploded perspective view. 2 is a plan view showing a frame employed in the surface light source device. 3 is a cross-sectional view showing the assembled state of the coplanar light source device.

As shown in these figures, the side light type surface light source device 1 includes a rectangular reflective sheet 3, a light guide plate 4, a diffusion sheet 5, a first prism sheet 6, and a second prism sheet. (7) and protective sheet (8) are provided. These members are housed in the frame (frame 2) and are superimposed in order.

Inside the frame 2, the rod-shaped light source 10 and the reflector 11 which surrounds one part are accommodated. The light guide plate 4 has a wedge-shaped cross section, and a rod-shaped light source 10 is disposed along the incident end surface 4a of the thick side (right side in FIG. 3).

The light guide plate 4 has three cross sections in which the rod-shaped light source 10 is not disposed in addition to the incident end surface 4a. In the present specification, not only the present embodiment, but among the three cross sections excluding the incidence cross section of the light guide plate, the cross section of the thin side of the wedge cross section is the "end face", and each cross section adjacent to the incidence cross section (4d in this embodiment). , 4e) will be referred to simply as "side" (lateral side 4d, side 4e in this embodiment).

In the whole upper surface of the 1st and 2nd prism sheet 6, 7, the substantially triangular protrusion 6a, 7a is formed in multiple numbers, respectively. The projection 6a extends substantially in parallel with the rod-shaped light source 10, while the projection 7a extends so as to be substantially perpendicular to the rod-shaped light source 10. As is known, illumination light preferentially exits from the light guide plate 4 obliquely. The prism sheets 6, 7 modify this directivity so that most of the illumination light is directed in the front direction (upward in FIG. 3).

One or both of the inner surfaces (lower surface; 4c) opposite to the exit surface (upper surface; 4b) of the light guide plate 4 are suitably formed with wrinkles or uneven surfaces, whereby uniform exit strength from the exit surface 4b is obtained. Is being studied.

On the upper surface side of the protective sheet 8, the liquid crystal display panel 12 of the liquid crystal display panel unit is arrange | positioned, and the liquid crystal display device 13 is comprised (refer FIG. 3).

When the rod-shaped light source 10 is turned on, light enters from the incident end surface 4a of the light guide plate 4. This light is then emitted from the exit surface 4b gradually while propagating inside the light guide plate 4. This output light is further supplied to the liquid crystal display panel 12 via the diffusion sheet 5, the prism sheets 6 and 7 and the protective sheet 8.

The frame 2 in this embodiment constitutes one frame assembly, and includes a first support frame 14, a second support frame 15, a pair of side frames 16a and 16b, and a liquid crystal display panel. The unit mounting members 17a and 17b and the auxiliary frame 18 are divided into respective parts (see Fig. 1). And assembling of apparatus is performed after these components are separately formed and prepared, respectively (refer FIG. 2, FIG. 3).

In addition, the liquid crystal display panel unit attaching members 17a and 17b are attached to each of the side frames 16a and 16b in pairs.

As shown in FIGS. 1 and 3, the first support frame 14 has a cross section of an inverted shape having an approximately L shape, and includes a reflective sheet 3, a light guide plate 4, a diffusion sheet 5, and a first, One end side of the second prism sheets 6 and 7 and the protective sheet 8 are supported. In addition, the rod-shaped light source 10 and the reflector 11 are also supported by this support frame 14.

The plate-shaped elastic member 21 is attached to the bottom face 14a of the support frame 14. The elastic member 21 has a click 20 protruding on the back 14b side of the support frame 14, and covers 22 between the click 20 and the back 14b of the support frame 14. The lower end portion 22a of the is fitted.

In addition, the cover 22 is fixed to the support frame 14 by the elastic force of the click 20, and has been studied so that attachment and detachment to the support frame 14 can be made easy.

Moreover, the cover 22 is attached to the support frame 14, and comprises the structure which has a substantially U-shaped cross section with the support frame 14, and presses the upper surface of the one end side of the protective sheet 8 to support. It is.

In addition, the second support frame 15 is disposed at a position facing the first support frame 14, and includes the reflective sheet 3, the light guide plate 4, the diffusion sheet 5, the first and second prism sheet. (6, 7) and the other end side of the protective sheet (8) are supported. The tongue piece part 15a is formed in the upper part of the both ends of this 2nd support frame 15, respectively.

Next, the side frames 16a and 16b are plate-like members disposed corresponding to the opposing side surfaces 4d and 4e, respectively. And the 1st tongue piece part 23 screwed to the fixing | fixed part 14c of the 1st support frame 14 is formed in the one end side. Moreover, the 2nd tongue piece part 24 screwed to the tongue piece part 15a of the 2nd support frame 15 is formed in the upper part of the other end side.

Four tongue-shaped protrusions 25 for fixing the liquid crystal display panel unit mounting members 17a and 17b are formed on the rear surfaces of the side frames 16a and 16b, respectively.

The liquid crystal display panel unit attaching members 17a and 17b include a base portion 26 screwed to the tongue-shaped projection 25 of the side frames 16a and 16b, and a side wall portion standing up from the base portion 26 ( 27 and a panel support portion 28 formed above the side wall portion 27 to position and support the liquid crystal display panel 12 of the liquid crystal display panel unit. And the panel support part 28 is provided with the processus | protrusion 30 which engages with the corner of the liquid crystal display panel 12. As shown in FIG.

The auxiliary frame 18 is formed in a thin plate shape, and is fixed to the tongue-shaped protrusion 25 with screws (not shown) together with the liquid crystal display panel unit mounting members 17a and 17b, so that the mechanical of the frame 2 can be fixed. Reinforce strength.

The attachment of each part of the frame 2 divided as mentioned above can be performed as follows.

(1) One end side (first tongue piece 23) of side frames 16a, 16b is fixed to first support frame 14 with screws (not shown).

(2) Moreover, the other end side (second tongue piece part 24) of the side frames 16a, 16b is fixed to the 2nd support frame 15 with a screw (not shown).

(3) The liquid crystal display panel unit mounting members 17a and 17b and the auxiliary frame 18 are fixed to the side frames 16a and 16b with screws (not shown).

Each part of the frame 2 is formed by injection molding a resin material such as polycarbonate. However, especially when high mechanical strength is required, the parts of the frame 2 may be formed of a suitable metal material.

As described above, in the present embodiment, the frame 2 includes the first support frame 14, the second support frame 15, the pair of side frames 16a and 16b, and the liquid crystal display panel unit mounting member 17a. , 17b).

Therefore, each of these parts can be molded separately. As a result, the molding of each component becomes easy, and the manufacture of the metal mold | die which molds each component becomes easy. In addition, the production of the mold is easy, and the production cost of the mold is reduced, and the production cost of the frame 2 is also reduced. Thereby, the price of the side light type surface light source device 1 using this frame 2 and the liquid crystal display device 13 in which the surface light source device 1 is formed can be reduced.

In this embodiment, since the liquid crystal display panel unit attaching members 17a and 17b are divided from the side frames 16a and 16b, the liquid crystal display panel unit is also used for the side light type surface light source device 1 having different sizes. It becomes possible to use the mounting members 17a and 17b. That is, this embodiment has the advantage that the liquid crystal display panel unit mounting members 17a and 17b can be formed in common.

In addition, in the present embodiment, the frame 2 is disassembled into a plurality of parts to facilitate production of each part, and a thin part can be easily formed. As a result, the frame 2 can be reduced in size and weight, and further, the side light type surface light source device and the liquid crystal display device can be reduced in size and weight.

In addition, the present embodiment has shown a configuration in which the liquid crystal display panel unit mounting members 17a and 17b and the side frames 16a and 16b are separately formed as described above, but the liquid crystal display panel unit mounting members 17a and 17b are respectively formed. And side frames 16a and 16b may be formed integrally. In this case, however, the number of parts of the frame 2 can be reduced, but it should be noted that the parts cannot be made into common parts.

In addition, although this embodiment showed the aspect which uses the auxiliary frame 18, when sufficient strength can be ensured by the other components of the frame 2, the auxiliary frame 18 can also be abbreviate | omitted.

(Second embodiment)

4, the principal part of the side light type surface light source device which concerns on 2nd Example of this invention is shown in exploded perspective view. 5, the frame employ | adopted in the said side light type surface light source device is shown by the top view. 6 is a cross-sectional view showing the assembled state of the side light type surface light source device. 7 is a sectional view showing a light guide plate of the side light type surface light source device. In addition, among all the members employ | adopted in this embodiment, the same code | symbol is attached | subjected about the member same as 1st Example, and the duplication description is abbreviate | omitted suitably.

As shown in these drawings, the side light type surface light source device 31 according to the present embodiment includes a rectangular reflective sheet 3, a light guide plate 33, and a sheet bundle 34. Here, the sheet bundle 34 sequentially stacks the diffusion sheet 5, the first prism sheet 6, the second prism sheet 7 and the protective sheet 8 (see FIG. 6). These are overlapped in order and accommodated and supported by the frame (frame) 32.

Inside the frame 32, a rod-shaped light source (primary light source) 10 and a reflector 11 surrounding a portion thereof are housed. The light guide plate 33 has a wedge-shaped cross section similar to that used in the first embodiment, and the rod-shaped light source 10 is disposed along the incident end face 33a of the thick side (right side in FIG. 6).

The functions of the constituent members (prism sheets 6, 7 and protective sheet 8) of the light guide plate 33 and the sheet bundle 34 are basically different from those in the first embodiment, and thus their repeated description is omitted. Moreover, the liquid crystal display panel 12 of the liquid crystal display panel unit is arrange | positioned outside the sheet | seat bundle 34, and the liquid crystal display device 13 is comprised (refer FIG. 6). The same as in the first embodiment of the embodiment in which the liquid crystal display panel 12 is illuminated by the side light type surface light source device 31.

The frame 32 in this embodiment also constitutes one frame assembly, and includes a first support frame 14, a second support frame 36, and a pair of side frames (liquid crystal display panel unit mounting frame; 37a). , 37b), divided into respective parts (see FIG. 4).

Each of these parts is to be assembled separately after being formed separately (see FIGS. 5 and 6). The assembly of the apparatus is carried out after these components are separately formed and prepared.

In the present embodiment, the side frames 37a and 37b and the second support frame 36 are directly fixed to the light guide plate 33. The first supporting frame 14 is fixed to the side frames 37a and 37b fixed to the light guide plate 33. The light guide plate 33 is usually made of a relatively large rigid material such as an acrylic resin, and may be the most rigid component among the components constituting the side light type surface light source device 31. Therefore, it is reasonable to directly fix the frame components 36, 37a, 37b to the light guide plate 33 as in the present embodiment.

As shown in FIG. 7, the light guide plate 33 is a tongue-shaped support frame mounting protrusion for fixing the second support frame 36 near both end portions of the end face 33b opposite to the incident end face 33a. 38 are respectively formed.

Moreover, the plate-shaped frame mounting protrusion 40 for attaching the side frames 37a and 37b is formed in the two side surfaces 33c of the light guide plate 33, respectively. These frame mounting protrusions 40 are formed in parallel to the exit surface 33a of the light guide plate 33.

In addition, the second support frame 36 is a frame formed at a position corresponding to the support projection portion 41 supporting the other end side of the reflective sheet 3 and the projection frame mounting projections 38 of the light guide plate 33. The mounting part 42 is provided.

The side frames 37a and 37b are provided with the base part 43 fixed to the frame mounting protrusion 40 of the light guide plate 33, and the side wall part 44 formed so that the side surface of the light guide plate 33 may be covered. . The panel support part 45 which supports the liquid crystal display panel 12 of a liquid crystal panel unit is formed in the upper surface of this side wall part 44. As shown in FIG.

And the panel support part 45 is provided with the positioning projection 46 which positions four corners of the liquid crystal display panel 12. As shown in FIG. In addition, each component, such as the support frames 14 and 36 and the side frames 37a and 37b, is formed by injection molding resin materials, such as polycarbonate. However, especially when high mechanical strength is required, it may be suitably formed of a metal material.

The attachment of each part of the frame 32 divided as mentioned above can be performed as follows.

(1) The frame mounting part 42 of the second support frame 36 is fixed to the support frame mounting protrusion 38 of the light guide plate 33 with a screw 47.

(2) The base portions 43 of the side frames 37a and 37b are fixed to the frame mounting protrusions 40 of the light guide plate 33 with screws 48.

(3) The fixing part 14c of the 1st support frame 14 is fixed to the one end side 44a of the side wall part 44 of side frame 37a, 37b with the screw which is not shown in figure. Thereby, the frame 32 as shown in FIG. 5 is assembled.

As described above, in the present embodiment, the frame 32 is divided into components of the first support frame 14, the second support frame 36, and the pair of side frames 37a and 37b. Each part can be molded separately. Therefore, similarly to the first embodiment, the production of each component and a mold for molding each component can be facilitated, and the production cost thereof can be reduced. As a result, the side light type surface light source device and the liquid crystal display device having the same device can be reduced in cost.

In this embodiment, the side frames 37a and 37b and the second support frame 36 are fixed to the light guide plate 33 having the largest rigidity among the components of the side light type surface light source device 31, and the fixing thereof is fixed. Since the first support frame 14 is fixed to the side frames 37a and 37b, the rigidity of the frame 32 can be made larger than that of the first embodiment in which the components of the frame 32 are fixed to each other. have.

Moreover, also in this embodiment, the frame 32 is disassembled into a plurality of parts to make each part easy to manufacture, and a thin part can also be shape | molded easily. For this reason, the size and weight of the frame 32 can be easily reduced, and further, the size and weight of the side light type surface light source device and the liquid crystal display device can be achieved.

In addition, although the aspect which fixed the 2nd support frame 36 to the light guide plate 33 was shown in this Example, it is also possible to employ | adopt the aspect as shown in FIG. That is, the tongue-shaped 1st fixing part 50 is formed in the edge part of the side frame 37a, and the tongue-shaped 2nd fixing part 51 is formed in the both ends of the 2nd support frame 36, The first fixing part 50 and the second fixing part 51 may be fixed with screws not shown.

In addition, in the above-described first and second embodiments, the side frames 16a and 16b or one of 37a and 37b and the first support frame 14 are elastically fixed with a spring or the like, By enabling relative movement of both, heat deformation of the light guide plate 4 or 33 can be absorbed.

Therefore, in such a case, even if the side frames 16a, 16b or 37a, 38b and the second support frame 15 or 36 are brought into close contact with the light guide plate 4 or 33, it is advantageous to prevent the leakage of light. It goes without saying that the prevention of light leakage causes an effective action of the light of the rod-shaped light source 10.

In addition, in the first and second embodiments described above, rod-shaped light sources 10 such as cold cathode tubes are employed as primary light sources for supplying primary light to the light guide plate, but other types of primary light sources are employed. You may be.

For example, as shown in FIG. 9A, a plurality of point light sources 52 such as light emitting diodes can be arranged, and these plurality of point light sources 52 can be used in place of the rod-shaped light source 10. As shown in FIG.

In addition, as shown in Fig. 9B, a point light source 54 such as a light emitting diode is arranged on the side end 53a side of the rod-shaped light guide member 53, and the light 55 emitted from the point light source 54 is guided. After propagating the inside of the member 53, one may be adapted to emit from the light guide member surface 53b. In this case, the light from the point light source 54 is used as the linear light source.

As described above, in the present invention, since the frame of the side light type surface light source device can be divided into a plurality of parts, and each part can be molded, the frame is compared with the prior art of integrally forming the entire thin frame. Makes the production easier. Moreover, since the metal mold | die for frame manufacture can also be made small in correspondence with each component, manufacture of the metal mold itself becomes easy and it becomes possible to reduce the metal mold manufacturing cost.

Therefore, according to the present invention, the side light type surface light source device and the liquid crystal display device including the side light type surface light source device can be reduced in size, and the price can be reduced.

In addition, the present invention does not need to fix the parts of the frame to the light guide plate with an adhesive material, so that light leakage due to the use of the adhesive material can be prevented.

Claims (8)

At least a rectangular reflective sheet, a light guide plate, and a prism sheet are sequentially stacked and accommodated in the frame, and a primary light source is received on the side of the incident end surface of the light guide plate, In the side light type surface light source device for supplying the light of the primary light source to the liquid crystal display panel of the liquid crystal display panel unit superimposed on the prism sheet through the light guide plate and the prism sheet, The frame body may include a first support frame supporting one end of the reflective sheet, the light guide plate, and the prism sheet and supporting the primary light source; A second support frame for supporting the other end side of the reflective sheet, the light guide plate, and the prism sheet; A side frame disposed at each side surface adjacent to the incident end surface of the light guide plate to connect and fix the first support frame and the second support frame; And a frame assembly fixed to the side frame and divided into a liquid crystal display panel unit mounting member for supporting the liquid crystal display panel. At least a rectangular reflecting sheet, a light guide plate, and a prism sheet are sequentially accommodated in the frame, and a primary light source for supplying light toward the incidence end face is provided on the side of the incidence end face of the light guide plate, The liquid crystal display panel of the liquid crystal display panel unit is disposed on the prism sheet, and the liquid crystal display panel unit is mounted on the frame, and the light of the primary light source is transferred to the liquid crystal display panel through the light guide plate and the prism sheet. In the liquid crystal display device to be supplied, The frame body may include a first support frame supporting one end of the reflective sheet, the light guide plate, and the prism sheet and supporting the primary light source; A second support frame for supporting the other end side of the reflective sheet, the light guide plate, and the prism sheet; A side frame disposed at each side surface adjacent to the incident end surface of the light guide plate to connect and fix the first support frame and the second support frame; And an assembly capable of being divided into a liquid crystal display panel unit mounting member fixed to the side frame to support the liquid crystal display panel. At least a rectangular reflective sheet, a light guide plate, and a prism sheet are sequentially overlapped and accommodated in the frame, and a primary light source for supplying light toward the incidence end face toward the side of the incidence end face of the light guide plate, In the side light type surface light source device for supplying the light of the primary light source to the liquid crystal display panel of the liquid crystal display panel unit superimposed on the prism sheet through the light guide plate and the prism sheet, The frame body may include a first support frame supporting one end of the reflective sheet, the light guide plate, and the prism sheet and supporting the primary light source; A second support frame for supporting the other end side of the reflective sheet, the light guide plate, and the prism sheet; A frame assembly disposed on each side of the light guide plate adjacent to the incident end surface, the frame assembly being divided into side frames supporting the liquid crystal display panel unit at the same time as fixing the first support frame and the second support frame; Apparatus comprising a. At least a rectangular reflective sheet, a light guide plate, and a prism sheet are sequentially overlapped and accommodated in the frame, and a primary light source for supplying light toward the incidence end face toward the side of the incidence end face of the light guide plate is accommodated. The liquid crystal display panel of the liquid crystal display panel unit is disposed on the prism sheet, and the liquid crystal display panel unit is mounted on the frame, and the light of the primary light source is transferred to the liquid crystal display panel through the light guide plate and the prism sheet. In the liquid crystal display device to be supplied, The frame body may include a first support frame supporting one end of the reflective sheet, the light guide plate, and the prism sheet and supporting the primary light source; A second support frame for supporting the other end side of the reflective sheet, the light guide plate, and the prism sheet; A frame assembly disposed on each side of the light guide plate adjacent to the incident end surface, the frame assembly being divided into side frames supporting the liquid crystal display panel unit at the same time as fixing the first support frame and the second support frame; Apparatus comprising a. The primary light source is arranged to the side of the incident cross section of the rectangular light guide plate, The prism sheet is disposed along the exit surface of the light guide plate, A reflective sheet is disposed along the rear surface of the light guide plate, A side light type surface light source device for emitting light from the incident end surface into the light guide plate toward the liquid crystal display panel of the liquid crystal display panel unit disposed on the prism sheet from the exit surface through the prism sheet; In A support frame mounting protrusion is formed on each side surface adjacent to the incident end surface of the light guide plate, and a liquid crystal display panel unit mounting frame is attached to the support frame mounting protrusion, A first support frame for supporting the primary light source and supporting one side of the reflective sheet, the light guide plate, and the prism sheet is fixed to one end of the frame for mounting the liquid crystal display panel unit, Each frame mounting protrusion is formed near both ends of the opposite end surface, And a second support frame for supporting the other end side of the reflective sheet to the frame mounting protrusion. The primary light source is arranged to the side of the incident cross section of the rectangular light guide plate, The prism sheet is disposed along the exit surface of the light guide plate, Arranging a liquid crystal display panel of the liquid crystal display panel unit through the prism sheet; The reflective sheet is disposed along the rear surface of the light guide plate, In the liquid crystal display device for emitting the light of the primary light source from the incident end surface into the light guide plate toward the liquid crystal display panel of the liquid crystal display panel unit disposed on the prism sheet through the prism sheet, A support frame mounting protrusion is formed on each side surface adjacent to the incident end surface of the light guide plate, A liquid crystal display panel unit mounting frame is attached to the support frame mounting protrusion, A first support frame for supporting the primary light source and one end of the reflective sheet, the light guide plate, and the prism sheet is fixed to one end of the frame for mounting the liquid crystal display panel unit, Frame mounting protrusions are formed in the vicinity of both ends of the distal end of the opposite side of the incident section, And a second support frame for supporting the other end side of the reflective sheet to the frame mounting protrusion. The primary light source is arranged to the side of the incident cross section of the rectangular light guide plate, The prism sheet is disposed along the exit surface of the light guide plate, A reflective sheet is disposed along the rear surface of the light guide plate, A side light type surface light source device for emitting the light of the primary light source inserted into the light guide plate from the incident end surface toward the liquid crystal display panel of the liquid crystal display panel unit disposed on the prism sheet through the prism sheet; To Frame mounting protrusions are formed on respective side surfaces adjacent to the incident end surface of the light guide plate, and a frame for mounting a liquid crystal display panel unit is attached to the frame mounting protrusion, Fixing a first support frame to one end of the frame for mounting the liquid crystal display panel unit, while supporting the primary light source and supporting one end of the reflective sheet, the light guide plate, and the prism sheet; And a second support frame for supporting the other end side of the reflective sheet, the light guide plate, and the prism sheet on the other end side of the frame for mounting the liquid crystal display panel unit. The primary light source is arranged on the side of the incident cross section of the rectangular light guide plate, The prism sheet is disposed along the exit surface of the light guide plate, Arranging the liquid crystal display panel of the liquid crystal display panel unit via the prism sheet; The reflective sheet is disposed along the rear surface of the light guide plate, A liquid crystal display device which emits light from the incident end surface into the light guide plate toward the liquid crystal display panel of the liquid crystal display panel unit disposed on the prism sheet from the exit surface through the prism sheet. Frame mounting projections are formed on respective side surfaces adjacent to the incident end surface of the light guide plate, Attaching a frame for mounting a liquid crystal display panel unit to the frame mounting protrusion, Fixing a first support frame to one end of the frame for mounting the liquid crystal display panel unit, while supporting the primary light source and supporting one end of the reflective sheet, the light guide plate, and the prism sheet. And a second support frame for supporting the other end side of the reflective sheet, the light guide plate, and the prism sheet on the other end side of the frame for mounting the liquid crystal display panel unit.