JP2012068421A - Liquid crystal display device and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which light utilization efficiency is increased and yield reduction is suppressed, and a manufacturing method thereof.SOLUTION: A manufacturing method of a liquid crystal display device includes the steps of: preparing a liquid crystal display panel assembly in which a driver chip and a main FPC 6 are installed on a liquid crystal display panel 4, a light guide plate assembly in which a light source FPC 74 packaging an LED 72 therein is mounted on a light guide plate 71, and a prism sheet assembly including a prism sheet 83 in which a light shield layer 60 which has an opening 911 larger than an effective display area Dd of the liquid crystal display panel 4 is formed; providing the light guide plate assembly in a predetermined area inside a frame case 3 which accommodates the liquid crystal display panel 4 and a plane emission irradiation panel 7; providing the prism sheet assembly on the light guide plate assembly inside the frame case 3; and providing the liquid crystal display panel assembly on the prism sheet assembly inside the frame case 3.

Description

  The present invention relates to a liquid crystal display device in which deterioration of display quality due to leakage light or stray light is prevented and a narrow frame is promoted, and a method for manufacturing the same.

  In recent years, mobile electronic devices such as mobile phones and personal digital assistants (PDAs) have become widespread, and the demand for smaller and thinner devices has been increasing. Therefore, the demand for a small and thin liquid crystal display device that is frequently used as a display monitor for mobile devices is extremely severe.

  In the case of a liquid crystal display device having a backlight, in order to promote thinning, a light source is disposed on the end face of the light guide plate as a backlight, and light that is emitted from the light source, enters the light guide plate, and propagates in one of the main light sources. A sidelight type surface emitting irradiation panel that emits in a planar shape from the surface is preferably used.

  In the above-described liquid crystal display device, the irradiation light emitted in a planar shape from the surface emitting irradiation panel is irradiated over a wide area that sufficiently covers the entire effective display area of the liquid crystal display panel. Conventionally, in order to make the luminance distribution of the emitted irradiation light uniform and efficiently irradiate the effective display area, an optical sheet is installed as a light control member on the light emission surface of the surface emitting irradiation panel.

  Here, the light emitted from the edge of the light exit surface, among the emitted light, is not effectively used for the display of the liquid crystal display panel even through the optical sheet, and the leaked light causes deterioration of the display quality. Or stray light. Such leakage light and stray light are blocked from being emitted to the observation side by the frame of the outer case, thereby preventing deterioration in display quality.

  However, the frame of a liquid crystal display device in recent years has been narrowed as much as possible in order to meet the demand for a reduction in size and thickness. Therefore, while the above-mentioned leakage light and stray light are repeatedly reflected in the storage chamber of the liquid crystal display panel, the frame is narrowed so that it is not blocked and emitted to the observation side, or into the liquid crystal display panel from the side. The incident light may become irregular light that cannot be properly controlled by an electric field, which may cause a reduction in image quality.

  Therefore, as shown in Patent Document 1, a liquid crystal display device has been proposed in which a light shielding sheet is interposed on the backlight side (back side) of the liquid crystal display panel to prevent the above-described leakage light and stray light from occurring.

JP 2009-265237 A

  However, liquid crystal display devices as recent display devices are increasingly required to reduce the frame area (hereinafter referred to as narrow frame) for further promotion of downsizing and thinning. It is necessary to promote narrowing of the frame by reducing the width of the light shielding frame to the minimum. As a result, a high level of assembly accuracy is required, and a defect occurs due to tolerances during assembly, which is a cause of a decrease in yield.

  An object of the present invention is to provide a liquid crystal display device in which light utilization efficiency is increased and a decrease in yield is suppressed, and a manufacturing method thereof.

In order to solve the above problems, according to one aspect of the present invention,
From the liquid crystal display panel assembly in which the driver chip and the first FPC are installed in the liquid crystal display panel, the light guide plate assembly in which the second FPC on which the light source is mounted is mounted on the light guide plate, and the effective display area of the liquid crystal display panel Preparing a prism sheet assembly including a prism sheet on which a light shielding layer having a large opening is formed, and
Providing the light guide plate assembly in a predetermined region in a frame case that houses the liquid crystal display panel and the surface emitting irradiation panel;
Providing the prism sheet assembly on the light guide plate assembly in the frame case;
Providing the liquid crystal display panel assembly on the prism sheet assembly in the frame case. A method for manufacturing a liquid crystal display device is provided.
In the above liquid crystal display manufacturing method, preferably,
The step of providing the prism sheet assembly includes
The prism sheet is arranged and fixed so as to overlap a shelf surface arranged in a plane provided on the frame case and partitioning the front chamber and the rear chamber.
In the above liquid crystal display manufacturing method, preferably,
The step of providing the prism sheet assembly includes
Providing the prism sheet assembly so that the light shielding layer is disposed between the liquid crystal display panel and the prism sheet.
In the above liquid crystal display manufacturing method, preferably,
The step of preparing the prism sheet assembly includes
A step of disposing the double-sided pressure-sensitive adhesive sheet on the front surface of the prism sheet such that the outer edge of the double-sided adhesive light-shielding sheet is along the outer edge of the prism sheet.
In the above liquid crystal display manufacturing method, preferably,
The step of preparing the prism sheet assembly includes
Forming a light shielding layer by printing a light shielding material on the front surface of the prism sheet;
In the above liquid crystal display manufacturing method, preferably,
The step of preparing the prism sheet assembly includes
Preparing a prism sheet forming sheet capable of forming a plurality of the prism sheets, and a light shielding layer forming sheet capable of forming a plurality of the light shielding layers;
Bonding the light shielding layer forming sheet to the prism sheet forming sheet;
Cutting the joined body of the forming sheets along the outer shape of each prism sheet assembly.
In the above liquid crystal display manufacturing method, preferably,
The step of preparing the prism sheet assembly includes
Printing a light-shielding material on the entire region where a plurality of light-shielding layers can be formed on a prism sheet-forming sheet capable of forming a plurality of prism sheets; and
Cutting the joined body of the forming sheets along the outer shape of each prism sheet assembly.
In the above liquid crystal display manufacturing method, preferably,
The step of preparing the prism sheet assembly includes
Forming a light reflecting layer by vapor-depositing a light reflective material on the front surface of the prism sheet;

According to another aspect of the invention,
A liquid crystal display panel;
A surface emitting irradiation panel that emits light in a plane toward the liquid crystal display panel;
An optical sheet laminate that is installed between the surface-emitting irradiation panel and the liquid crystal display panel and adjusts optical characteristics of emitted light, and
The optical sheet laminate includes a prism sheet disposed at a position closest to the liquid crystal display panel,
A light-shielding layer that is installed so as to overlap the light emission surface of the prism sheet, and has an opening that is wider than the effective display area of the liquid crystal display panel and smaller than the effective light-emitting area of the surface-emitting irradiation panel. A liquid crystal display device is provided.
In the above liquid crystal display device, preferably,
A front chamber for holding and housing the liquid crystal display panel in a predetermined position and a rear chamber for holding and housing the surface emitting irradiation panel in a predetermined position via a space on the back side of the liquid crystal display panel are formed. A frame case, wherein the rear chamber and the rear chamber communicate with each other through a light irradiation port of a predetermined size;
The area of the light irradiation opening is larger than the area of the opening of the light shielding layer.
In the above liquid crystal display device, preferably,
The frame case has a shelf surface arranged in a plane that partitions the front chamber and the rear chamber,
The prism sheet is disposed so as to overlap the shelf surface and is fixed to the shelf surface.
In the above liquid crystal display device, preferably,
The light-shielding layer is made of a light-shielding sheet having an adhesive layer, and the entire light-shielding sheet is adhered to the light exit surface of the optical sheet via the adhesive layer.
In the above liquid crystal display device, preferably,
The light shielding layer is formed by printing a light shielding material on the front surface of the prism sheet.
In the above liquid crystal display device, preferably,
A light reflecting layer is formed by depositing a light reflecting material on the front surface of the prism sheet, and the light blocking layer is formed by printing a light blocking material on the light reflecting layer.
In the above liquid crystal display device, preferably,
The surface-emitting irradiation panel has a light source disposed on an end surface of a light guide plate, and emits light that is emitted from the light source, enters the light guide plate, and is propagated in a planar shape from one main surface. It is.

  ADVANTAGE OF THE INVENTION According to this invention, the use efficiency of light is increased and the liquid crystal display device with which the fall of the yield was suppressed is provided.

1 is a schematic cross-sectional view showing a liquid crystal display device as one embodiment of the present invention. It is a disassembled perspective view of the said liquid crystal display device. It is an expansion disassembled perspective view of the principal part in the said liquid crystal display device. It is a top view which shows arrangement | positioning of the main member in the said liquid crystal display device. It is the typical sectional view showing the liquid crystal display as a 2nd embodiment of the present invention.

  FIG. 1 is a view showing a liquid crystal display device according to an embodiment of the present invention, and is a schematic cross-sectional view taken along the line II in FIG. FIG. 2 is an exploded perspective view of the liquid crystal display device shown in FIG. 1 with the storage case 1 and the cover case 2 removed. As shown in FIG. 1, the casing of the present liquid crystal display device is fitted with a cover case 2 having a shape in which a bottom plate is removed in a storage case 1 in which a top plate of a box having a flat outer shape is removed. It becomes. Both of these cases 1 and 2 are formed by processing a metal plate. A display window 22 for observing the display is formed in the top plate 21 of the cover case 2.

  A frame case 3 is disposed in the casing. The frame case 3 of the present embodiment is formed by resin molding using a resin material, for example, by an injection method or the like, and has a front chamber 3a and a surface serving as a storage chamber for a liquid crystal display panel in a space that forms a flat rectangular parallelepiped. A rear chamber 3b serving as a storage chamber for the light emitting irradiation panel is formed in two layers. And the shelf part 32 is protrudingly provided by the three side walls 31b-31d except the side wall 31a in the four side walls 31a-31d (refer FIG. 2) of the frame case 3. FIG. That is, the internal space of the frame case 3 is partitioned into a front chamber 3 a and a rear chamber 3 b by a plane including the shelf surface 321. Accordingly, the front chamber 3a is a storage chamber wider than the rear chamber 3b by the area of the shelf surface 321, and the entire opened upper surface of the rear chamber 3b becomes the light irradiation port Oi.

  A liquid crystal display panel 4 is accommodated and held in the front chamber 3a. Before the liquid crystal display panel 4 forms a pair of rectangles, the rear glass substrates 41 and 42 are joined together with a frame-shaped sealing material (not shown) while maintaining a predetermined gap, and the front and rear glass substrates are surrounded by the frame-shaped sealing material. The liquid crystal is sealed between the opposing surfaces 41 and 42 (hereinafter referred to as inner surfaces). A pair of front and rear polarizing plates 43 and 44 are attached to the outer surfaces of the front and rear glass substrates 41 and 42, respectively.

  Of the front and rear glass substrates 41 and 42, the rear glass substrate 42 is formed with a protruding edge portion 421 by projecting one short side edge outward from the corresponding end surface of the front glass substrate 41. On the surface which is the above-mentioned inner surface of the projecting edge 421, although not shown, lead wirings that are conductively connected to the electrodes of both the boards 41 and 42, their respective connection terminals, drive signal input wirings, and the like. A driver chip 5 as a liquid crystal driving circuit element is directly mounted by a COG (Chip On Glass) method. The external size of the liquid crystal display panel 4, that is, the area of the rear glass substrate 41, is set to an area that is slightly smaller than the area of the front chamber 3a (can be surrounded with a slight gap over the entire circumference).

  A flexible wiring board for supplying drive control signals (hereinafter referred to as a main FPC (Flexible Printed Circuit Board)) 6 is electrically connected to the connection terminal row of the drive signal input wiring formed at the tip of the protruding edge 421. It is joined. The main FPC 6 is pulled out of the case from a notch 31e provided on the side wall 31a of the frame case 3, and is folded back to the back side of the rear chamber 3b.

  In the rear chamber 3b of the frame case 3, a surface emitting irradiation panel 7 as a backlight is installed. The surface-emitting irradiation panel 7 of the present embodiment is a backlight panel that emits planar irradiation light by a sidelight method, and is one of the transparent light guide plates 71 having a rectangular shape that roughly corresponds to the liquid crystal display panel 4 to be irradiated. A plurality of LEDs 72 as light sources are arranged on the end side. Further, the light reflecting sheet 73 is disposed so as to face the rear surface 712 which is the surface opposite to the front surface (light emitting surface) 711 facing the liquid crystal display panel 4 of the light guide plate 71. Although not shown, the back surface 712 has minute irregularities.

  The light guide plate 71 is molded into a substantially transparent rectangular plate using a resin material such as polycarbonate. As shown in FIG. 2, a recess 713 for accommodating the LED 72 is formed on the end surface (light incident end surface) of the light guide plate 71 on the side where the LED 72 is disposed. In the present embodiment, the two LEDs 72 are installed in a state of being accommodated in two recesses 713 that are evenly disposed so as to face the end surface of the light guide plate 71 on the light source side.

  The two LEDs 72 are directly mounted on an FPC 74 (hereinafter referred to as “light source FPC”) by a COF (Chip On Film) system, and the light source FPC 74 is mounted on the light incident side end of the front surface 711 of the light guide plate 71. Are accommodated and held in the corresponding recesses 713. The light source FPC 74 is conductively connected to a predetermined portion of the main FPC 6 joined to the liquid crystal display panel 4 described above.

  An open-type light case 75 from which not only the top plate but also the side plate at the corner portion is removed is fitted and mounted at a predetermined position in the frame case rear chamber 3b. In the light case 75, the light reflection sheet 73 and the LED 72 are fitted. Is arranged so as to overlap with the light guide plate 71 on which the light source FPC 74 mounted is mounted, and the entire surface emission irradiation panel 7 is stored and held in the rear chamber 3b in a predetermined arrangement.

  In the surface emitting irradiation panel 7 configured as described above, the light emitted from the LED 72 enters the light guide plate 71 from the light incident end surface facing the LED 72, and this incident light passes through the light guide plate 71 to the inner surface. While propagating the reflection repeatedly, it is reflected toward the front surface 711 by the rear surface 712 on which minute irregularities are formed, and light is emitted in a planar shape from the effective light emitting region Di excluding the edge of the front surface 711. The effective light emitting region Di is substantially rectangular and has a size that just includes the region where the above-described minute irregularities are formed in the rear surface 712. The light guide plate 71 also emits light in the region outside the effective light emitting region Di, but when there is a foreign object in a region overlapping the effective light emitting region Di or when there is an external defect such as a chip in the light guide plate 71, The light guide plate 71 is determined to be defective.

  On the front surface 711 of the light guide plate 71, an optical sheet laminate 8 as a light control member is installed. The optical sheet laminate 8 is formed by sequentially laminating a light diffusion sheet 81, a first prism sheet 82, and a second prism sheet 83 on the front surface 711 of the light guide plate 71. The diffusion sheet 81 makes the luminance distribution of the planar emission light uniform, and the first and second prism sheets 82 and 83 adjust the traveling direction of the planar emission light by these cooperative actions to increase the luminance in the front direction. Is provided.

  Here, of the three optical sheets 81 to 83, the uppermost second prism sheet 83 closest to the liquid crystal display panel 4 is a lower layer disposed between the second prism sheet 83 and the light guide plate 71. The two first prism sheets 82 and the light diffusion sheet 81 are formed in a larger area. Specifically, three edge portions corresponding to the shelf surface 321 of the frame case 3 overlap the shelf surface 321, and the three edge portions are minute clearances c (see FIG. 4), the edge corresponding to the side wall 31a where the shelf 32 is not provided is extended to the extent that the corresponding edge of the light guide plate 71 can be substantially covered. The edge corresponding to the side wall 31a is provided outside the effective light emitting region Di.

  Thus, the front double-sided PSA sheet 91 is provided on the front surface (the surface facing the liquid crystal display panel 4) of the uppermost second prism sheet 83, and the rear double-sided PSA sheet 92 is provided on the rear surface of the second prism sheet 83. Are attached. These double-sided adhesive light-shielding sheets 91 and 92 are formed on both sides of a flexible substrate made of polyethylene terephthalate (Poly-Eethylene Trephthalate) or the like, and black organic or inorganic dyes or pigments such as carbon black, acetylene black, lamp black, A paint containing a black colorant composed of bone black, graphite, aniline black, cyanine black, etc. is printed and applied to form a black layer. Bar coat and Mayer bar coat are formed on each black layer. It can be obtained by forming an adhesive layer by applying an acrylic adhesive by appropriate means such as reverse coating, gravure coating, and die coating.

  Here, as shown in FIG. 3, the front double-sided pressure-sensitive adhesive sheet 91 adhered to the front surface of the second prism sheet 83 is formed in a rectangular frame shape having an opening 911. The front double-sided pressure-sensitive adhesive sheet 91 has the same outer shape as the second prism sheet 83. Therefore, the front double-sided pressure-sensitive adhesive sheet 91 sticks out with its outer edge aligned with the front edge of the second prism sheet 83, so that the entire surface overlaps the front surface of the second prism sheet 83. Is arranged so that there is no.

  The size of the opening 911 is large enough to include the entire effective display area Dd in which an image to be observed is displayed with a margin of an appropriate length, and the entire area from the surface emitting irradiation panel 7 is planar. The effective light emitting region Di from which light is emitted is set to be small enough to be included within a margin of an appropriate length. In the present embodiment, the area visually recognized by the display window 22 of the cover case 2 is matched with the effective display area Dd.

  On the other hand, the rear double-sided pressure-sensitive adhesive sheet 92 adhered to the rear surface of the second prism sheet 83 is formed in a U shape as shown in FIG. The rear double-sided pressure-sensitive adhesive sheet 92 is formed in a U-shape corresponding to the shelf surface 321 of the frame case 3 (see FIG. 4). Specifically, the outer shape of the second prism sheet 83 is formed to be equal to the outer shape of the edge of the three sides excluding the short side on the side where the LED 72 is provided. Accordingly, the rear double-sided pressure-sensitive adhesive sheet 92 is adhered to the rear surface of the second prism sheet 83 after aligning the corresponding outer edges. Further, in the state where the opposite adhesive surface is attached to the shelf surface 321 in a regular arrangement, like the second prism sheet 83 described above, it is between the inner surfaces of the three side walls 31b to 31d of the frame case 3. A minute clearance c is secured. The rear side double-sided pressure-sensitive adhesive sheet 92 is a member mainly for fixing the liquid crystal display panel 4 to the frame case 3 rather than light-shielding, and thus may be a simple double-sided pressure-sensitive adhesive sheet that does not have light-shielding properties.

  Returning to FIG. 1, the drive control circuit board 10 that controls the driving of the entire liquid crystal display device of the present embodiment is pulled out of the housing composed of the storage case 1 and the cover case 2 and installed on the rear surface of the storage case 1. The main FPC 6 to which the light source FPC 74 described above is conductively connected is conductively joined to the drive control circuit board 10.

  Next, an assembly procedure of the liquid crystal display device of the present embodiment configured as described above will be described mainly with reference to FIG.

  First, the front double-sided PSA sheet 91 and the rear double-sided PSA sheet 92 are respectively attached to the front and rear surfaces of the second prism sheet 83 to prepare a second prism sheet assembly. At this time, the outer edge sides of the double-sided pressure-sensitive adhesive light-shielding sheets 91 and 92 are attached in alignment with the corresponding edge sides of the second prism sheet 83.

  In addition, a light guide plate assembly in which a light source FPC 74 having LEDs 72 mounted on the light guide plate 71 is mounted, a liquid crystal display panel assembly in which a driver chip 5 and a main FPC 6 are installed in the liquid crystal display panel 4, and a frame case 3 are also prepared. Keep it.

  First, the light case 75 is fitted in a predetermined position in the rear chamber 3b of the frame case 3. Next, the light reflecting sheet 73 and the light guide plate assembly are sequentially installed in the light case 75. At this time, the light source FPC 74 is pulled out of the frame case 3.

  Thereafter, the light diffusion sheet 81 and the first prism sheet 82 are aligned and placed on the light exit surface 711 of the light guide plate 71, and then the prepared second prism sheet assembly is mounted on the shelf 32 of the frame case 3. Install in. At this time, as shown in FIG. 4, the three edges corresponding to the shelf surface 321 of the frame case 3 overlap the shelf surface 321, and the three side walls 31 b to 31 d of the frame case 3 and the second prism sheet A rear-side double-sided pressure-sensitive adhesive sheet 92 having a U-shape is adhered to the shelf surface 321 in an arrangement in which a clearance c having substantially the same width is evenly secured between corresponding edges of 83. At this stage, the second prism sheet 83 is in a state of being installed substantially parallel to each other through a slight space with respect to the first prism sheet 82.

  Thereafter, the liquid crystal display panel assembly is installed in the front chamber 3 a of the frame case 3. At this time, the liquid crystal display panel assembly can be easily installed at a predetermined position simply by dropping the rear glass substrate 41 along the inner surfaces of the side walls 3 a to 3 d of the frame case 3. At the dropped position, the rear glass substrate 41 is stuck to the second prism sheet 83 via the front double-sided pressure-sensitive adhesive sheet 91. Accordingly, the liquid crystal display panel assembly is fixed to the frame case 3 via the second prism sheet assembly.

  As described above, in the assembly manufacturing operation of the liquid crystal display device of the present embodiment, the front-side double-sided adhesive light-shielding sheet 91 and the rear-side double-sided adhesive light-shielding sheet 92 are previously aligned with the front and rear surfaces of the second prism sheet 83, respectively. Since this second prism sheet assembly is installed on the shelf surface 321 of the frame case 3, the installation position of the front double-sided adhesive light-shielding sheet 91 arranged as a light-shielding member with respect to the second prism sheet 83 is the frame case 3. There will be no slippage during assembly. Further, the front and rear double-sided pressure-sensitive adhesive light-shielding sheets 91 and 92 can be easily positioned, which contributes to a reduction in assembly man-hours.

  As described above, the liquid crystal display device according to the present embodiment has the outer shape of the second prism sheet 83 laminated on the uppermost layer of the optical sheet laminate 8 placed on the light emission surface of the surface emitting irradiation panel 7. The front side double-sided adhesive light-shielding sheet 91 installed on the light exit surface of the second prism sheet 83 is enlarged so that the corresponding frame case shelf surface 321 sufficiently overlaps with the outer shape of the second prism sheet 83, and an opening 911 is formed. A configuration in which the entire effective light emitting area Di of the surface emitting irradiation panel 7 is set to be small enough to ensure a margin with an appropriate width and is set, and the entire front side double-sided adhesive light shielding sheet 91 is installed in the second prism sheet 83. It is said that.

  Thereby, the diffused light which does not form planar emission light, that is, emitted from the light guide plate 71 without passing through the optical sheet laminated body 8 or outside from the edge of the optical sheet laminated body 8 (the side away from the effective light emitting region Di). The light emitted to the liquid crystal display panel 4 side is reliably blocked. As a result, the occurrence of leakage light and stray light that cause the display quality to deteriorate is reliably prevented, and the display quality of the liquid crystal display device is maintained at a high level.

  In addition, when the second prism sheet 83 is laminated on the first prism sheet 82, the front double-sided adhesive light-shielding sheet 91 and the rear double-sided adhesive light-shielding sheet 92 are aligned on the second prism sheet 83 in the proper positions in advance. Since the adhered second prism sheet assembly is prepared, the rear side double-sided adhesive light-shielding sheet 92, the second prism sheet 83, and the front side double-sided adhesive light-shielding sheet 91 are individually and sequentially installed as compared to the conventional case. Thus, the assembling work for each of these sheets can be carried out accurately and easily, and the number of manufacturing work steps can be reduced.

  Moreover, you may make a 2nd prism sheet assembly along the following procedures. That is, a large-sized second prism sheet forming sheet capable of forming a plurality of second prism sheets 83 is prepared, and a plurality of front-side double-sided pressure-sensitive adhesive sheets 91 can be formed on the front surface of the second prism sheet forming sheet. A large double-sided double-sided adhesive light-shielding sheet forming sheet capable of forming a plurality of double-sided double-sided adhesive light-shielding sheets 92 on the backside of the second prism sheet-forming sheet. By sticking, a second prism sheet assembly forming sheet capable of forming a plurality of second prism sheet assemblies is formed. Next, the second prism sheet assembly forming sheet is cut along the outer shape of each second prism sheet assembly to be formed, thereby producing a plurality of second prism sheet assemblies. By manufacturing the double-sided adhesive light-shielding sheets 91 and 92 on the second prism sheet 83, the outer edges of the double-sided adhesive light-shielding sheets 91 and 92 become the corresponding edges of the second prism sheet 83. It is possible to save the trouble of matching.

  Next, a second embodiment of the present invention will be described with reference to FIG. In addition, about the component same as the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The difference between the present embodiment and the above embodiment is that the light shielding sheet is installed only to regulate the emission range of the emitted light from the backlight in this embodiment, and the liquid crystal display panel as in the above embodiment is installed. This is a point that is not used for fixing to the frame case.

  In the liquid crystal display device of the present embodiment, the step surface 201 included in the plane that partitions the front chamber 20a and the rear chamber 20b of the frame case 20 is formed over the entire circumference of the inner surface of the case side wall. And the double-sided adhesive sheet 30 is installed in the predetermined location of the level | step difference surface 201 over this perimeter. The double-sided pressure-sensitive adhesive sheet 30 is installed only for fixing the liquid crystal display panel 4 to the frame case 20, and therefore does not have a light shielding property.

  In the surface emitting irradiation panel 40, a plurality of LEDs 402 are installed on one end surface of the light guide plate 401, as in the above embodiment. On the rear surface 4012 opposite to the front surface 4011 of the light guide plate 401, the light reflection sheet 403 is disposed to face the light reflection plate 403. The LED 402 is directly mounted on the light source FPC 404, and the light source FPC 404 is installed on the rear surface 4012 of the light guide plate 401 adjacent to the light reflecting sheet 403.

  In the present embodiment, a light case for storing and holding the surface emitting irradiation panel 40 in the rear chamber 20b is not provided. Therefore, the surface emitting irradiation panel 40 is directly mounted on the bottom surface 11 of the storage case 1. Is placed.

  The optical sheet laminate 50 is installed on the front surface 4011 of the light guide plate 401 in the surface emitting irradiation panel 40. In the optical sheet laminate 50 of the present embodiment, a light diffusion sheet 501, a first prism sheet 502, and a second prism sheet 503 having the same size as the front surface 4011 of the light guide plate 401 are sequentially stacked on the front surface 4011 of the light guide plate 401. It becomes.

  A light shielding layer 60 is formed on the front surface of the second prism sheet 503. The light shielding layer 60 is formed in a rectangular frame shape whose outer shape is the same as that of the optical sheet laminate 50. A rectangular opening 601 is formed in the light shielding layer 60, and the size of the opening 601 is large enough to include the entire effective display area Dd with a margin of an appropriate length, and the entire surface emitting light. The effective light-emitting area Di of the irradiation panel 40 is set to be small enough to be included within a margin of an appropriate length.

  The light shielding layer 60 of the present embodiment is printed with a black paint containing a colorant such as a black dye or pigment, such as carbon black, acetylene black, lamp black, bone black, or the like, on the front surface of the second prism sheet 503. By doing so, it can be easily formed. In this case, a black paint is printed and applied so that the thickness of the light shielding layer 60 is 10 μm or more.

  The main FPC 50 that is conductively joined to the front end portion of the protruding edge portion 421 of the rear glass substrate 42 of the liquid crystal display panel 4 and drawn out of the frame case 20 is drawn out of the housing formed of the storage case 1 and the cover case 2, and is not shown in the figure. The drive control circuit board is electrically connected. Similarly to the above embodiment, the light source FPC 403 is conductively connected to the main FPC 50.

  In addition, each external shape of the surface light emission irradiation panel 40 and the optical sheet laminated body 50 mounted on this is set to the magnitude | size which can ensure a minute clearance equally with respect to the side wall inner surface over the perimeter of the back chamber 20b. Accordingly, the positions in the planar direction of the surface emitting irradiation panel 40 and the optical sheet laminate 50 are regulated by the entire inner peripheral surface of the side wall of the rear chamber 20b even without providing a fixing member or a holding structure. However, there is no risk that it will shift to such an extent that it will cause optical problems.

  As described above, in the liquid crystal display device of this embodiment, the black paint is applied to the surface of the optical sheet laminate 50 facing the liquid crystal display panel 4 in order to regulate the light emission range of the surface emitting irradiation panel 40 as a backlight. Since the light shielding layer 60 made of is directly formed, the position of the light shielding layer 60 with respect to the optical sheet laminate 50 does not shift during the manufacturing process. Further, the size of the opening 601 of the light shielding layer 60 is large enough to include the entire effective display region Dd with a margin of an appropriate length, and the entire size is appropriate for the effective light emitting region Di of the surface emitting irradiation panel 40. The width is set to be small enough to be included within the margin. Thereby, generation | occurrence | production of the leakage light and stray light which cause the display quality of the liquid crystal display panel 4 to fall can be prevented stably and reliably over a long period of time.

  In addition, the light shielding layer 60 is preliminarily applied and formed on the front surface of the second prism sheet 503 laminated on the uppermost layer of the optical sheet laminate 50, and at the time of assembly, the light shielding layer 60 on which the light shielding layer 60 is formed is formed. The two prism sheets 503 need only be placed on the first prism sheet 502 installed in the rear chamber 30b, and the number of manufacturing work steps can be greatly reduced.

  Moreover, you may make a 2nd prism sheet assembly along the following procedures. That is, a large-sized second prism sheet forming sheet on which a plurality of second prism sheets 503 can be formed is prepared, and overlaps the entire region where the plurality of light shielding layers 60 formed on the plurality of second prism sheets 503 are formed. In this way, a black paint is printed and applied, and a large-size double-sided double-sided adhesive light-shielding sheet-forming sheet capable of forming a plurality of double-sided double-sided adhesive light-shielding sheets 92 on the rear surface of the second prism sheet forming sheet Then, a second prism sheet assembly forming sheet on which a plurality of second prism sheet assemblies can be formed is formed. Next, a plurality of second prism sheet assemblies may be manufactured by cutting the second prism sheet assembly forming sheet along the outer shape of each second prism sheet assembly to be formed.

  In addition, this invention is not limited to said embodiment etc., Of course, various deformation | transformation are possible in the technical scope of this invention.

  For example, a light reflecting layer that reflects light including visible light may be interposed on the surface emitting irradiation panel side of the light shielding layer. As a result, the light that should be wasted after being shielded can be reflected and re-entered into the light guide plate to be reused as effective emitted light. Alternatively, the light reflecting layer may be formed by forming an aluminum vapor deposition film so as to have a frame shape having a larger opening than the light shielding layer 60.

  Further, the member that adjusts the planar emission light of the surface emitting irradiation panel is not limited to a laminated body of a plurality of optical sheets, and may be a single optical sheet.

DESCRIPTION OF SYMBOLS 1 Storage case 2 Cover case 3, 20 Frame case 3a, 20a Front chamber 3b, 20b Rear chamber 4 Liquid crystal display panel 41, 42 Front, rear glass substrate 43, 44 Front, rear polarizing plate 5 Driver chip 6 Main FPC (1st FPC )
7, 40 Surface emitting irradiation panel 71, 401 Light guide plate 72 LED
73 Light reflecting sheets 74, 404 FPC for light source (second FPC)
75 Light cases 8 and 50 Optical sheet laminate 81 and 501 Light diffusion sheets 82 and 502 First prism sheet 83 and 503 Second prism sheet 91 Front double-sided adhesive light-shielding sheet 92 Rear double-sided adhesive light-shielding sheet 911 Opening 30 Double-sided adhesive sheet 60 Light shielding layer 601 opening

Claims (15)

From the liquid crystal display panel assembly in which the driver chip and the first FPC are installed in the liquid crystal display panel, the light guide plate assembly in which the second FPC on which the light source is mounted is mounted on the light guide plate, and the effective display area of the liquid crystal display panel Preparing a prism sheet assembly including a prism sheet on which a light shielding layer having a large opening is formed, and
Providing the light guide plate assembly in a predetermined region in a frame case that houses the liquid crystal display panel and the surface emitting irradiation panel;
Providing the prism sheet assembly on the light guide plate assembly in the frame case;
Providing the liquid crystal display panel assembly on the prism sheet assembly in the frame case. The step of providing the prism sheet assembly includes
The prism sheet is disposed and fixed so as to overlap a shelf surface disposed in a plane provided on the frame case and partitioning the front chamber and the rear chamber. 2. A method for producing a liquid crystal display device according to 1. The step of providing the prism sheet assembly includes
The liquid crystal display device according to claim 1, further comprising a step of providing the prism sheet assembly such that the light shielding layer is disposed between the liquid crystal display panel and the prism sheet. Production method. The step of preparing the prism sheet assembly includes
4. The method according to claim 1, further comprising a step of disposing the double-sided adhesive light-shielding sheet on a front surface of the prism sheet such that an outer edge of the double-sided adhesive light-shielding sheet is along the outer edge of the prism sheet. A method for manufacturing a liquid crystal display device. The step of preparing the prism sheet assembly includes
4. The liquid crystal display device manufacturing method according to claim 1, further comprising: forming the light shielding layer by printing a light shielding material on a front surface of the prism sheet. 5. Method. The step of preparing the prism sheet assembly includes
Preparing a prism sheet forming sheet capable of forming a plurality of the prism sheets, and a light shielding layer forming sheet capable of forming a plurality of the light shielding layers;
Bonding the light shielding layer forming sheet to the prism sheet forming sheet;
And a step of cutting a joined body of the forming sheets along the outer shape of each prism sheet assembly. 6. The liquid crystal display device according to claim 1, Production method. The step of preparing the prism sheet assembly includes
Printing a light-shielding material on the entire region where a plurality of light-shielding layers can be formed on a prism sheet-forming sheet capable of forming a plurality of prism sheets; and
And a step of cutting a joined body of the forming sheets along the outer shape of each prism sheet assembly. 6. The liquid crystal display device according to claim 1, Production method. The step of preparing the prism sheet assembly includes
The liquid crystal display device according to claim 1, further comprising a step of forming a light reflecting layer by depositing a light reflective material on a front surface of the prism sheet. Production method. A liquid crystal display panel;
A surface emitting irradiation panel that emits light in a plane toward the liquid crystal display panel;
An optical sheet laminate that is installed between the surface-emitting irradiation panel and the liquid crystal display panel and adjusts optical characteristics of emitted light, and
The optical sheet laminate includes a prism sheet disposed at a position closest to the liquid crystal display panel,
A light-shielding layer that is installed so as to overlap the light emission surface of the prism sheet, and has an opening that is wider than the effective display area of the liquid crystal display panel and smaller than the effective light-emitting area of the surface-emitting irradiation panel. A liquid crystal display device. A front chamber for holding and housing the liquid crystal display panel in a predetermined position and a rear chamber for holding and housing the surface emitting irradiation panel in a predetermined position via a space on the back side of the liquid crystal display panel are formed. A frame case, wherein the rear chamber and the rear chamber communicate with each other through a light irradiation port of a predetermined size;
The liquid crystal display device according to claim 9, wherein an area of the light irradiation port is larger than an area of the opening of the light shielding layer. The frame case has a shelf surface arranged in a plane that partitions the front chamber and the rear chamber,
The liquid crystal display device according to claim 10, wherein the prism sheet is disposed so as to overlap the shelf surface and is fixed to the shelf surface.   The said light shielding layer consists of a light shielding sheet which has an adhesion layer, and the whole light shielding sheet is affixed on the light emission surface of the said optical sheet through the said adhesion layer, The any one of Claim 9 thru | or 11 characterized by the above-mentioned. The liquid crystal display device according to one item.   The liquid crystal display device according to claim 9, wherein the light shielding layer is formed by printing a light shielding material on a front surface of the prism sheet.   A light reflecting layer is formed by vapor-depositing a light reflecting material on the front surface of the prism sheet, and the light blocking layer is formed by printing a light blocking material on the light reflecting layer. The liquid crystal display device according to claim 13.   The surface-emitting irradiation panel has a light source disposed on an end surface of a light guide plate, and emits light that is emitted from the light source, enters the light guide plate, and is propagated in a planar shape from one main surface. The liquid crystal display device according to claim 9, wherein the liquid crystal display device is a liquid crystal display device.

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