JP2013015740A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of suppressing display unevenness due to the installation of a front window.SOLUTION: A liquid crystal display device includes: a liquid crystal display panel; a backlight unit disposed on a back surface side of the liquid crystal display panel; a frame member for storing the liquid crystal display panel and the backlight unit; and a front member adhered to a display surface side of the liquid crystal display panel exposed from an opening portion formed on the frame member, through a photocurable adhesive layer. The liquid crystal display device is provided with a shielding film formed on a surface opposing to the liquid crystal display panel of the front member, and formed along a peripheral edge portion of the front member; and a plurality of projecting portions formed with cross-sectional shape of a projecting area aligned along the peripheral edge portion of the shielding film in a curve surface shape.

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device in which a transparent front window is fixed on the display surface side.

  There is a liquid crystal display device in which a transparent substrate called a transparent front window is disposed on the display surface side of a liquid crystal display panel. A liquid crystal display device including a front window is configured to fix the front window to the display surface side of the liquid crystal display panel using a photo-curable adhesive made of a photo-curing resin. The front window prevents a direct impact or the like from being directly applied to the second substrate exposed on the display surface side, and functions as a protective plate for protecting the liquid crystal display panel formed of the glass substrate. A light-shielding film (black light-shielding part) is formed around the front window, and when curing the photo-curing adhesive, light for curing is irradiated from the display surface side of the front window and also from the side direction. The photocurable adhesive is cured by irradiating light.

  However, when a front window is fixed to the display surface side of a liquid crystal display panel formed by a liquid crystal dropping method (ODF method) using a photocurable adhesive, as shown in FIG. There is a problem that display unevenness occurs in the side portion shown, and in particular, yellow is displayed on the side portion during gray display. The reason why such display unevenness occurs is that when a photo-curing adhesive for fixing the front window to the liquid crystal display panel is cured, an area irradiated with light from a transparent portion of the front window (transmission area) and a light shielding Since the film is formed, the curing rate and the degree of curing differ between the area irradiated with light from the side (shielding area), and the shrinkage (curing shrinkage) of the photocurable adhesive between the transparent area and the light-shielding area. This is because a difference in strain) occurs in the liquid crystal display panel.

  As a method for reducing such uneven curing of the photocurable resin in the transparent region and the shielding region, for example, there is a display device described in Patent Document 1. In the display device described in Patent Document 1, the light reflectance is high on the upper layer of the light shielding part (black light shielding part, light shielding film) formed around the front window, that is, on the side of the front window facing the liquid crystal display panel. A reflection part made of a thin film layer is formed.

JP 2009-192794 A

  The cause of the difference in strain stress on the liquid crystal display panel is the difference in the amount of shrinkage of the photo-curable adhesive due to the difference in the amount of light irradiated to the transparent region and the light-shielding region described in Patent Document 1. There is a concern that the film thickness of the cured adhesive also affects the shrinkage.

  FIG. 7 is a side sectional view of a conventional liquid crystal display device. A liquid crystal display panel LCD including a first substrate SUB1 and a second substrate SUB2 and a backlight unit (backlight device) BU are an upper frame UF and a lower frame. It is configured to be stored in the frame LF and held by the module member MD. A light shielding film (black matrix) BM2 is formed on the side of the front window FW arranged on the display surface side so as to face the liquid crystal display panel LCD. Therefore, when the front window FW is fixed to the display surface side of the liquid crystal display panel LCD, that is, the upper layer of the polarizing plate POL, the light-shielding film BM2 is formed with the UV adhesive layer ADH that is a photo-curable adhesive. The film thickness of the UV adhesive layer ADH is different between the area to be covered and the other area. Furthermore, since a UV adhesive having a relatively low viscosity tends to be used, the edge portion is affected by the flow of the UV adhesive or the surface tension during the period from application to curing of the UV adhesive. It is known that the film thickness differs in the central part.

  FIG. 8 is a cross-sectional photograph of the UV adhesive layer ADH corresponding to each of the circles D, E, and F shown in FIG. 6, and as shown in FIGS. 8A to 8C, the UV adhesive layer ADH. The thicknesses of the edge portions shown in circles D and F in FIG. 6 are different from those in the center portion shown in circle E of FIG. For example, the film thickness L1 of the UV adhesive layer in the circle D portion of FIG. 6 shown in FIG. 8A is L1 = 53 μm, and the UV adhesive in the circle F portion of FIG. 6 shown in FIG. The layer thickness L3 is L3 = 54 μm. On the other hand, the film thickness L2 of the UV adhesive layer ADH in the circle H portion of FIG. 6 shown in FIG. 8B which is the region excluding the edge portion is L2 = 72 μm, and the light-shielding film is about 10 μm. The film thickness of the UV adhesive layer ADH is smaller at the edge than the film thickness of BM.

  On the other hand, in the display device described in Patent Document 1, the thin film layer for forming the reflective portion is formed on the upper layer of the light shielding film, that is, the surface facing the liquid crystal display panel, and the region where the light shielding film BM is formed. In other regions, the difference in film thickness of the UV adhesive layer ADH becomes large. Furthermore, since the film thickness varies depending on the flow of the UV adhesive layer ADH from the edge of the front window FW and the influence of surface tension, the center and edge of the UV adhesive layer ADH The difference in film thickness becomes large. For this reason, the amount of shrinkage of the UV adhesive layer ADH differs greatly between the transparent region of the front window and the region where the light-shielding film BM is formed, resulting in a strain stress difference in the liquid crystal display panel.

  In particular, when a liquid crystal display panel is formed by a liquid crystal dropping method, for example, after a sealing material is applied in an annular shape in advance along the side of the second substrate, the liquid crystal is filled in a region surrounded by the sealing material. Next, the first substrate is made to face the second substrate, and then the sealing material is cured to fix the first substrate to the second substrate and seal the liquid crystal. The pressure in the region where is sealed is about atmospheric pressure. Further, with the progress of thinning of liquid crystal display devices in recent years, the first substrate and the second substrate constituting the liquid crystal display panel are formed of very thin glass substrates of about 0.2 mm. For this reason, even if a small strain stress difference occurs in the second substrate, there is a problem that the second substrate is deformed and display unevenness occurs.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a technique capable of suppressing display unevenness associated with the mounting of a front window.

  (1) In order to solve the above problems, a liquid crystal display panel, a backlight unit disposed on the back side of the liquid crystal display panel, a frame member for housing the liquid crystal display panel and the backlight unit, and the frame member A front member that is fixed to the display surface side of the liquid crystal display panel exposed from the opening formed on the surface of the liquid crystal display panel via a photo-curable adhesive layer. A light-shielding film formed on a surface facing the liquid crystal display panel and formed along a peripheral edge of the front member; and projecting from the light-shielding film toward the liquid crystal display panel and arranged along the peripheral edge of the light-shielding film The liquid crystal display device includes a plurality of projecting portions in which the cross-sectional shape of the projecting region is curved.

  According to the present invention, display unevenness associated with the installation of the front window can be suppressed.

  Other effects of the present invention will become apparent from the description of the entire specification.

It is a figure for demonstrating schematic structure of the liquid crystal display device of Embodiment 1 of this invention. It is sectional drawing for demonstrating the detailed structure of the liquid crystal display device of Embodiment 1 of this invention. It is a top view for demonstrating the formation position of the mirror dot in the liquid crystal display device of Embodiment 1 of this invention. It is a figure for demonstrating the detailed structure of the mirror dot part of the liquid crystal display device of Embodiment 1 of this invention. It is sectional drawing for demonstrating the detailed structure of the liquid crystal display device of Embodiment 2 of this invention. It is a photograph which shows the generation | occurrence | production body of the display unevenness in the conventional liquid crystal display device. It is sectional drawing of the edge part in the conventional liquid crystal display device. It is a cross-sectional photograph for demonstrating the film thickness of the UV adhesive of the side part in the conventional liquid crystal display device.

  Embodiments to which the present invention is applied will be described below with reference to the drawings. However, in the following description, the same components are denoted by the same reference numerals, and repeated description is omitted. Also, X and Y shown in the figure indicate the X axis and the Y axis, respectively.

<Embodiment 1>
<overall structure>
FIG. 1 is a diagram for explaining a schematic configuration of a liquid crystal display device according to a first embodiment of the present invention. Hereinafter, an overall configuration of the liquid crystal display device according to the first embodiment will be described with reference to FIG. However, in the following description, thin film layers such as the thin film transistor TFT and the light shielding films (black matrix) BM1 and BM2 can be formed by a well-known photolithography technique, and thus a detailed forming method is omitted.

  As shown in FIG. 1, the liquid crystal display device according to the first embodiment includes a first substrate on which pixel electrodes PX, thin film transistors TFT, and the like are formed, and a color filter and a black matrix (not shown) that are opposed to the first substrate. A liquid crystal display panel formed by a liquid crystal dropping method (ODF method), which includes a second substrate to be disposed, and a liquid crystal layer (not shown) sandwiched between the first substrate and the second substrate; A liquid crystal display device is configured by combining a front window (front member) FW arranged on the display surface side of the panel and a backlight unit (backlight device) (not shown) arranged on the back surface side of the liquid crystal display panel. ing.

  The liquid crystal display panel and the backlight unit are a box-shaped lower frame (frame not shown) in which the backlight unit is disposed on the bottom surface of the box and the liquid crystal display panel LCD is disposed on the irradiation side of the backlight. Member) and a box-like upper frame (frame member) FW fitted to the lower frame. The liquid crystal display panel LCD includes a flexible wiring board FPC1 that supplies control signals for image display and the like, and a flexible wiring board FPC2 that supplies power to the backlight unit. The flexible wiring board FPC1 is electrically connected to the liquid crystal display panel LCD, and the flexible wiring board FPC2 is electrically connected to a light source constituting the backlight unit. Although the flexible wiring board FPC1 and the flexible wiring board FPC2 have different configurations, they may be formed by one flexible wiring board.

  An opening OP is formed on the display surface side of the upper frame FW, and a display image is output through the opening OP1. That is, the backlight light emitted from the backlight unit is modulated by the liquid crystal display panel LCD, and the modulated light is emitted as a display image through the opening OP, and the display image is recognized by an observer (not shown). .

  In the liquid crystal display device of the first embodiment, the front window FW is fixed by the UV adhesive layer ADH formed in a planar shape on the display surface side of the liquid crystal display panel LCD exposed from the opening OP. The width and length of the front window FW are formed larger than the opening width and length of the opening OP, and the peripheral edge of the front window FW is a region between the peripheral edge of the upper frame UF and the peripheral edge of the opening OP. It is the structure which reaches (frame area). At this time, in the liquid crystal display device according to the first embodiment, a light shielding film (black matrix) is formed along the side of the front window FW on the back surface side of the front window FW, that is, the side opposed to the liquid crystal display panel LCD. In addition, a reflection part (protrusion part) in which a plurality of mirror dots (hemispheres) HM indicated by dotted lines in FIG. 1 are arranged is formed on the upper layer of the light shielding part, that is, on the side facing the liquid crystal display panel LCD. ing. The light shielding film of the first embodiment is, for example, a well-known light shielding film formed on a liquid crystal display panel LCD (a black thin film material such as black resin or chrome, similar to a black matrix), and the upper frame from the outer edge of the front window FW. It is formed with a width that reaches the inner region of the opening portion OP of the UF The detailed configuration of the mirror dot HM and the light shielding film will be described in detail later.

  Further, in the liquid crystal display device of the first embodiment, the liquid crystal side surface of the first substrate and in the display area AR is extended in the X direction in FIG. A gate line (scanning signal line) GL to which the scanning signal is supplied is formed. Further, a drain line (video signal line) DL is formed which extends in the Y direction in FIG. 1 and is juxtaposed in the X direction and to which a video signal (gradation signal) is supplied from the drive circuit. These gate lines GL and drain lines DL are formed of, for example, a metal thin film such as aluminum, but may be formed of a conductive film formed of another conductive material. A rectangular region surrounded by the gate line GL and the drain line DL constitutes a region in which pixels are formed (hereinafter referred to as a pixel region), whereby each pixel is a matrix within the display region AR indicated by a one-dot chain line. Arranged in a shape.

  For example, as shown in an equivalent circuit diagram A ′ of a circle A in FIG. 1, each pixel includes a thin film transistor TFT that is turned on / off by a scanning signal from the gate line GL, and a drain line through the turned on thin film transistor TFT. A pixel electrode PX to which a video signal from DL is supplied and formed on at least the entire surface of the display area AR, and video from both sides or one end of the left and right sides in the X direction (end portion of the first substrate SUB1) via the common line CL. And a common electrode CT to which a common signal having a reference potential with respect to the signal potential is supplied. However, the thin film transistor TFT is a thin film transistor having a so-called inverted stagger structure, and is driven so that the drain electrode and the source electrode are switched by application of a bias. However, in this specification, the thin film transistor TFT is connected to the video signal line DL for convenience. The side connected to the drain electrode DT and the side connected to the pixel electrode PX will be referred to as a source electrode ST.

  An electric field having a component parallel to the main surface of the first substrate SUB1 is generated between the pixel electrode PX and the common electrode CT, and liquid crystal molecules are driven by this electric field. Such a liquid crystal display device is known to be capable of so-called wide viewing angle display, and is called an IPS (In-Plane Switching) method or a horizontal electric field method because of the peculiarity of applying an electric field to the liquid crystal. Further, in the liquid crystal display device having such a configuration, normally black which minimizes the light transmittance when no electric field is applied to the liquid crystal (black display) and improves the light transmittance by applying the electric field. The display is performed in the display form. The present invention is not limited to the IPS liquid crystal display device, and can be applied to other drive liquid crystal display devices such as a TN (Twisted Nematic) method and a VA (Vertical Alignment) method. .

<Detailed configuration of mirror dots>
Next, FIG. 2 is a cross-sectional view for explaining the detailed configuration of the liquid crystal display device according to the first embodiment of the present invention, and FIG. 3 is a diagram for explaining the formation positions of mirror dots in the liquid crystal display device according to the first embodiment of the present invention. A detailed configuration of the mirror dot of the present invention will be described below with reference to FIGS. 2 and 3. 2 is a cross-sectional view taken along the line BB ′ shown in FIG. 1, and FIG. 3 is an enlarged view of a corner portion of the liquid crystal display device according to the first embodiment.

  As shown in FIG. 2, on the bottom side of the box-shaped lower frame LF, a light source (not shown), a light guide plate LG that converts light from the light source into backlight light that is planar light, and a light guide plate LG. A backlight unit BU composed of a known optical sheet OS for uniformly diffusing backlight light from the light plate LG is disposed. A liquid crystal display panel LCD is disposed on the upper surface of the backlight unit BU, and an upper frame UF having an opening OP corresponding to the display area AR of the liquid crystal display panel LCD is disposed. One surface of the upper frame UF and the lower frame LF is opened along the side wall surface, and the side wall portion of the upper frame UF and the side wall portion of the lower frame LF are fitted so as to match the opening side, The liquid crystal display panel LCD and the backlight unit BU are accommodated. In addition, a mode for holding the liquid crystal display panel LCD and the backlight unit BU in a predetermined position between the edge portion (side wall portion) of the backlight unit BU and the liquid crystal display panel LCD and the side wall surface of the lower frame LF. A member MD is arranged.

  The liquid crystal display panel LCD is formed of a first substrate SUB1 and a second substrate SUB2 that are arranged to face each other with a liquid crystal layer (not shown) interposed therebetween. Further, a light shielding film (hereinafter referred to as a black matrix) BM1 is provided along the side of the second substrate SUB2 between the liquid crystal surface side of the second substrate SUB2, that is, between the second substrate SUB2 and the first substrate SUB1. The backlight is formed from a region other than the display region AR. At this time, the polarizing plate POL1 is disposed (attached) on the backlight unit BU side of the first substrate SUB1, and the polarizing plate POL2 is disposed (attached) on the display surface side of the second substrate SUB2.

  Furthermore, a UV adhesive layer ADH is formed on the polarizing plate POL2 on the display surface side of the liquid crystal display panel LCD, that is, on the display surface side of the second substrate SUB2, and the front window FW is displayed on the liquid crystal display by the UV adhesive layer ADH. It is configured to be fixed to the display surface side of the panel LCD. On the side of the front window FW facing the liquid crystal display panel LCD, a light shielding film (hereinafter referred to as a black matrix) BM2 is formed around the periphery of the front window FW. The width of the black matrix BM2 is such that the outer peripheral end extends to the edge of the front window FW, and the inner peripheral end of the black matrix BM2 is at least the sides of the polarizing plate POL2 and the UV adhesive layer ADH. It extends to the center side from the edge.

  By this black matrix BM2, the end (edge) of the polarizing plate POL2 formed so as to cover the display surface side of the liquid crystal display panel LCD, the end (edge) of the UV adhesive layer ADH, and The end portion of the opening OP formed in the upper frame UF is prevented from being recognized from the display surface side. The black matrix BM2 is configured to prevent leakage of backlight light from the peripheral edge of the liquid crystal display panel LCD from leaking to the display surface side. Furthermore, it is possible to prevent and protect the external force from the display surface side of the liquid crystal display device from being directly applied to the first substrate SUB1 and the second substrate SUB2 made of the glass substrate forming the liquid crystal display panel LCD. It has become.

  The upper layer (surface) of the black matrix BM2 is a convex body protruding from the upper layer of the black matrix BM2 toward the liquid crystal display panel LCD, and the cross-sectional shape thereof is a curved surface shape (semicircular shape, lens shape). A hemispherical mirror dot HM is formed. As shown in FIG. 3, the mirror dots HM are plural at a predetermined interval along the extending direction of the black matrix BM2 formed so as to surround the display area AR in which the pixels PXL are arranged, that is, along the edge of the front window FW. The reflection part of this invention is formed by arranging in parallel. In particular, the mirror dot HM of the first embodiment has a high surface reflectance.

  In particular, the mirror dots HM of Embodiment 1 are arranged adjacent to each other at a very narrow interval. With this configuration, after applying a UV adhesive having a relatively small viscosity and fluidity, the UV is irradiated with the UV light. The so-called dam effect can prevent the UV adhesive from flowing out during the period until the adhesive is fully cured and the aggregation of the UV adhesive accompanying the surface tension at the end. In the first embodiment, the interval between the mirror dots HM is very small compared to the diameter of the bottom surface of each mirror dot HM. However, the present invention is not limited to this. For example, the UV adhesive layer The size and arrangement interval of each mirror dot HM can be appropriately changed according to the viscosity of ADH, the irradiation effect of light for curing (ultraviolet rays or the like) by the mirror dot HM, and the like.

  FIG. 4 is a diagram for explaining the detailed configuration of the mirror dot portion of the liquid crystal display device according to the first embodiment of the present invention. In particular, FIG. 4 is an enlarged view of a circle C shown in FIG. Hereinafter, based on FIG. 4, the detailed configuration of the mirror dots HM forming the reflecting portion of Embodiment 1 and the curing promoting action by the UV adhesive layer ADH by the mirror dots HM will be described.

  In the liquid crystal display device of Embodiment 1, the front window FW is formed of a transparent substrate such as an acrylic substrate having a thickness of 0.5 mm, and the upper frame UF is a metal plate having a plate thickness L1 of L1 = 0.1 to 0.15 mm. It is formed with. The film thickness L3 of the polarizing plate POL2 disposed on the display surface side of the second substrate SUB2 constituting the liquid crystal display panel LCD is L3 = 0.125 to 0.175 mm, and is formed in the upper layer of the polarizing plate POL2. The film thickness L2 of the UV adhesive layer ADH is L2 = 40 to 50 μm. Further, the front window FW is configured to extend to the frame area of the upper frame UF.

  Therefore, for example, even when the gap (interval) between the lower surface (surface on the liquid crystal display panel LCD side) of the frame area of the upper frame UF and the display surface side of the liquid crystal display panel LCD is 0 (zero), An interval L4 between the frame UF and the front window FW in the Y direction is about L4 = 20 to 30 μm.

  Here, in the liquid crystal display device of the present invention, when curing ultraviolet rays are irradiated from the side direction as indicated by an arrow A1 in FIG. 4, some of the ultraviolet rays are directly irradiated to the adhesive layer ADH, and the rest The ultraviolet rays are reflected by the mirror dots HM that form the reflecting portion. Here, since the mirror dot HM of Embodiment 1 is formed of a highly reflective member and the surface shape thereof is formed in a hemispherical shape, the incident ultraviolet rays are indicated by an arrow A2 in FIG. Then, it is diffused by the mirror dot HM. As a result, even if ultraviolet rays are incident from a narrow region between the upper frame UF and the front window FW, the ultraviolet adhesive layer ADH in the region overlapping with the black matrix BM2 can be efficiently irradiated with ultraviolet rays. The UV adhesive layer ADH can be cured efficiently. That is, the UV adhesive layer ADH can be cured in the same manner as the region irradiated with ultraviolet rays from the display surface side of the front window FW.

  Thereby, without increasing the processing time required to cure the UV adhesive layer ADH, the UV adhesive layer ADH in the shielding region overlapping the black matrix BM2 and the transparent portion overlapping the transparent portion of the front window FW. The amount of ultraviolet rays irradiated to the UV adhesive layer ADH in the region can be adjusted. Therefore, by adjusting the degree of curing of the UV adhesive layer ADH in the transparent region and the shielding region, the amount of curing shrinkage of the UV adhesive layer ADH is controlled to uniformly form the film thickness distribution of the UV adhesive layer ADH. can do. As a result, since the difference in strain stress applied to the second substrate SUB2 can be greatly reduced, even in a liquid crystal display device formed by a liquid crystal dropping method, occurrence of display unevenness in the side portion is prevented. be able to.

  At this time, the adjustment of the degree of curing of the UV adhesive layer ADH in the transparent region and the shielding region, that is, the control of the amount of curing shrinkage of the UV adhesive layer ADH is performed, for example, first by the peripheral portion provided with the mirror dots HM, ie, the black matrix The UV adhesive layer ADH is cured by irradiating only the shielding region where the BM2 is formed with ultraviolet rays for curing from the side surface direction. Thereafter, ultraviolet rays corresponding to the cured state of the peripheral portion are irradiated from the display surface side to adjust the degree of curing of the UV adhesive layer ADH in the transmission region of the front window FW that is the central portion, and the UV adhesive layer ADH There is a method of forming a uniform film thickness distribution of the UV adhesive layer ADH by controlling the amount of curing shrinkage. As another method, when the UV adhesive layer ADH in the transparent region and the shielding region is cured at the same time, the irradiation intensity and irradiation time of the ultraviolet ray for curing irradiated from the side surface direction and the display surface direction are adjusted. A method of adjusting the degree of curing of the UV adhesive layer ADH in the transparent region and the shielding region, controlling the amount of curing shrinkage of the UV adhesive layer ADH, and uniformly forming the film thickness distribution of the UV adhesive layer ADH, etc. is there.

  Further, the mirror dots HM of the first embodiment are formed so as to protrude in a hemispherical shape from the upper layer of the black matrix BM2, and UV is not covered so as not to cover the entire surface of each mirror dot HM forming the reflection portion. The adhesive layer ADH is applied. Accordingly, each mirror dot HM can prevent the UV adhesive from flowing out and agglomerating due to surface tension before and during curing due to the dam effect described above, so that UV adhesion in a region near the edge of the front window FW can be prevented. It can prevent that the film thickness of the agent layer ADH becomes thinner or thicker than the center part. As a result, it is possible to greatly reduce the strain stress difference with respect to the second substrate SUB2 due to the different film thicknesses of the UV adhesive layer ADH, thereby preventing the occurrence of display unevenness and the margin for the occurrence of display unevenness. That is, the margin can be increased.

  Furthermore, in Embodiment 1, the film thickness of the UV adhesive layer ADH is very thin in the region where the mirror dots HM are formed, but as is apparent from FIG. 4, the position where the mirror dots HM are formed is the side of the front window FW. Since it is on the edge side, the formation area of the mirror dot HM is smaller than the width of the black matrix BM2, and further, a part (about half) of the mirror dot HM is superimposed on the UV adhesive layer ADH. Depending on the film thickness of the UV adhesive layer ADH accompanying the formation of the mirror dots HM, it is possible to reduce the strain stress difference generated in the second substrate SUB2.

<Embodiment 2>
FIG. 5 is a cross-sectional view for explaining the detailed configuration of the liquid crystal display device according to the second embodiment of the present invention. Hereinafter, the detailed configuration of the liquid crystal display device according to the second embodiment will be described with reference to FIG. However, the liquid crystal display device of the second embodiment is different from that of the first embodiment except for the configuration of the mirror dots HM. Therefore, in the following description, the configuration of the mirror dot HM will be described in detail.

  The arrangement and outer shape of the mirror dots HM of the second embodiment are the same as those of the first embodiment, and are convex body shapes protruding from the upper layer of the black matrix BM2 formed on the opposite surface side of the front window FW. The cross-sectional shape is a hemisphere having a curved shape.

  The mirror dot HM of Embodiment 2 having this shape is made of, for example, a light-transmitting low-hardness type acrylic resin material, and has a configuration that allows light to pass through the inside. Yes. In addition, the member which forms the mirror dot HM is not limited to a low-hardness type acrylic resin material, and may be another material having light transmittance.

  Also in the mirror dot HM of the second embodiment, about half of the mirror dot HM (left side portion in FIG. 5) is covered with the UV adhesive layer ADH, and the other half (right side portion in FIG. 5) is covered. It is configured to be exposed in the frame direction of the upper frame UF, that is, in the irradiation direction of ultraviolet rays for curing. Therefore, the ultraviolet ray for curing can be transmitted to the region located relatively inward from the edge of the front window FW in the region covered with the black matrix BM2, and the ultraviolet ray is efficiently applied to the UV adhesive layer ADH. Can be irradiated. As a result, in the same manner as in the first embodiment, the UV adhesive layer ADH is equivalent to the region where the black matrix BM2 is formed in a short time (shielding region) as well as the region that can be irradiated with ultraviolet rays from the display surface side of the front window FW. Can be cured.

  Therefore, when the UV adhesive layer ADH that fixes the front window FW to the display surface side of the liquid crystal display panel LCD is cured, the UV adhesive layer ADH in the light-shielding region that is the side of the front window FW is cured with a desired degree of curing. After being cured, it is possible to cure the UV adhesive layer ADH in the transparent region, which is a transparent portion of the front window FW, with a degree of curing corresponding to the light shielding region. As a result, it is possible to easily control the curing shrinkage amount of the UV adhesive layer ADH in the light shielding region and the transparent region by appropriately controlling the irradiation amount of ultraviolet rays, and the film thickness of the cured UV adhesive layer ADH. Can be formed uniformly, so that the strain stress difference with respect to the second substrate SUB2 can be made uniform.

  When the curing ultraviolet rays are irradiated from the side direction as indicated by an arrow A1 in FIG. 5, a part of the ultraviolet rays are directly applied to the adhesive layer ADH, and the remaining ultraviolet rays are applied to the mirror dots HM serving as the light transmitting portions. Incident. Here, the mirror dot HM of Embodiment 2 has translucency, is formed of an acrylic material that transmits ultraviolet light for curing, and further, its surface shape is formed in a hemispherical shape. As shown by an arrow A2 in FIG. 4, the ultraviolet light thus transmitted passes through the mirror dot HM and is scattered. As a result, the UV adhesive layer ADH formed in the shielding region overlapping with the black matrix BM2 can be efficiently irradiated with ultraviolet rays, equivalent to the region irradiated with ultraviolet rays from the display surface side of the front window FW, The UV adhesive layer ADH can be cured.

  Thereby, without increasing the processing time required to cure the UV adhesive layer ADH, the UV adhesive layer ADH in the shielding region overlapping the black matrix BM2 and the transparent portion overlapping the transparent portion of the front window FW. The amount of ultraviolet rays irradiated to the UV adhesive layer ADH in the region can be adjusted. Therefore, by adjusting the degree of curing of the UV adhesive layer ADH in the transparent region and the shielding region, the amount of curing shrinkage of the UV adhesive layer ADH is controlled to uniformly form the film thickness distribution of the UV adhesive layer ADH. can do. As a result, since the strain stress difference applied to the second substrate SUB2 can be greatly reduced, even in a liquid crystal display device formed by a liquid crystal dropping method (ODF method), display unevenness in the side portion is not displayed. Occurrence can be prevented. However, the adjustment of the degree of curing of the UV adhesive layer ADH in the transparent region and the shielding region, that is, the control of the amount of curing shrinkage of the UV adhesive layer ADH can be controlled by the same method as in the first embodiment.

  Further, since the mirror dot HM of the first embodiment is formed of a low hardness type acrylic resin material, the mirror dot HM is applied to the second substrate SUB2 even after the UV adhesive layer ADH is cured. Therefore, it is possible to obtain a special effect that the strain stress difference applied to the second substrate SUB2 can be reduced.

  In the liquid crystal display devices of the first and second embodiments, the case where an ultraviolet curable resin that is cured by irradiation of ultraviolet rays is used as the UV adhesive layer ADH as the photocurable resin has been described, but the present invention is not limited thereto. For example, the structure using other photocurable resins, such as visible light curable resin hardened | cured by irradiation of visible light etc., may be sufficient.

  In the liquid crystal display devices of Embodiments 1 and 2, the mirror dot HM has a high reflectance on the surface or the mirror dot HM has a high transmittance. However, the present invention is not limited to this. For example, A configuration in which mirror dots are formed by a member in which a reflective material such as a granular material having a high reflectance is mixed with a material having a high transmittance may be employed. In this case, the ultraviolet rays for curing can be reflected in the same manner as in the first embodiment, and the ultraviolet rays can be transmitted in the same manner as in the second embodiment, so that the UV adhesive layer ADH in the light shielding region can be cured more efficiently. .

  Further, in the liquid crystal display devices of the first and second embodiments, a protective transparent substrate is fixed as a front window disposed on the display surface side of the liquid crystal display panel. The structure which adheres may be sufficient.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment of the invention. However, the invention is not limited to the embodiment of the invention, and various modifications can be made without departing from the scope of the invention. It can be changed.

UF: Upper frame, LF: Lower frame, OP: Opening, AR ... Display area FW ... Front window, TFT ... Thin film transistor, PXL ... Pixel DL ... Drain line (video signal line), GL ... Gate lines (scanning signal lines)
PX: Pixel electrode, CL: Common line, CT: Common electrode, SUB1 ... First substrate SUB2 ... Second substrate, BM1, BM2 ... Black matrix, OS ... Optical sheet LG ... Light guide plate, BU: Backlight unit, LCD: Liquid crystal display panel MD: Module member, FPC1, FPC2 ... Flexible wiring board ADH ... UV adhesive layer, POL1, POL2 ... Polarizing plate, HM ... Mirror dot

Claims (6)

A liquid crystal display panel, a backlight unit disposed on the back side of the liquid crystal display panel, a frame member that houses the liquid crystal display panel and the backlight unit, and an opening formed in the frame member are exposed. A front member fixed to the display surface side of the liquid crystal display panel via a photocurable adhesive layer,
A light shielding film formed on a surface of the front member facing the liquid crystal display panel and formed along a peripheral edge of the front member;
A liquid crystal display device comprising: a plurality of projecting portions projecting from the light shielding film toward the liquid crystal display panel and having a cross-sectional shape of a projecting region arranged along a peripheral portion of the light shielding film formed in a curved surface shape .   The liquid crystal display device according to claim 1, wherein the protrusion has a high light reflectance.   The liquid crystal display device according to claim 1, wherein the protrusion is made of a transparent material having a high light transmittance.   4. The liquid crystal display device according to claim 1, wherein a part of the protruding portion is covered with the adhesive layer. 5.   The liquid crystal display device according to claim 1, wherein a protruding amount of the protruding portion is smaller than a thickness of the adhesive layer.   The degree of curing of the adhesive layer in a region overlapping with the light shielding film and the degree of curing of the adhesive layer in a region not overlapping with the light shielding film are different from each other. A liquid crystal display device according to 1.