JP6664229B2 - Display device having light guide block - Google Patents

Description

  The present invention relates to a display device manufacturing apparatus, and more particularly to a manufacturing apparatus for bonding a cover glass to a display panel using an ultraviolet curable resin.

  2. Description of the Related Art Flat displays such as liquid crystal display devices and organic EL display devices are thin and lightweight, and their demands are expanding as portable displays such as mobile phones. A cover glass is disposed on the liquid crystal display device or the organic EL display device for mechanical protection. The present invention relates to bonding a cover glass to a display panel. In this specification, a liquid crystal display device will be mainly described, but the present invention can also be applied to an organic EL display device.

  2. Description of the Related Art In a liquid crystal display device, a TFT substrate in which pixel electrodes, thin film transistors (TFTs), and the like are formed in a matrix, a counter substrate facing the TFT substrate, and a liquid crystal sandwiched between the TFT substrate and the color filter substrate. It has become. An image is formed by controlling the light transmittance of the liquid crystal molecules for each pixel.

  In order to adhere a cover glass to the surface of the liquid crystal display panel, an ultraviolet curable resin is used. There is an example in which an ultraviolet curable resin is used for bonding a seal portion between a TFT substrate and a counter substrate in a liquid crystal display panel. As an example in which an ultraviolet curable resin is used as a sealing material, see Patent Document 1. Patent Literature 2 and Patent Literature 3 are cited.

Japanese Patent No. 05417545 JP 2005-208479 A JP 2014-235278 A

  On the cover glass adhered to the surface of the liquid crystal display panel, a black frame (hereinafter referred to as a black frame) is formed by printing or the like due to a demand for design. The adhesive includes a thermosetting resin and an ultraviolet curable resin. As the adhesive for bonding the cover glass and the liquid crystal display panel, an ultraviolet curable resin having a short curing time is used.

  Ultraviolet rays are emitted from the main surface side of the cover glass, but the resin is hardly cured in the black frame portion because the ultraviolet rays do not transmit. If there is a resin that does not cure, the resin flows out or bubbles are generated. Although the resin may be in the form of a sheet at the beginning, if it is not cured, a sufficient adhesive force is not generated, so that a problem of separation between the cover glass and the liquid crystal display panel occurs.

  In addition, if there is a portion where the resin is hardened and a portion where the resin is not hardened, unevenness occurs in the stress on the counter substrate of the liquid crystal display panel, which is caused by the distance between the TFT substrate and the counter substrate in the liquid crystal display panel, that is, the layer of the liquid crystal layer. In some cases, the thickness may be affected, causing color unevenness or the like.

  An object of the present invention is to cure an ultraviolet curable resin for bonding a liquid crystal display panel and a cover glass even in a black frame portion of the cover glass, and to cure the ultraviolet curable resin on the entire surface of the liquid crystal display panel and the cover glass. .

  The present invention solves the above problems, and a typical configuration is as follows.

  (1) An apparatus for manufacturing a display device in which a display panel and a cover glass having a transparent portion and a black frame are adhered by an ultraviolet curable resin, wherein the cover glass is provided on the surface of the display panel via an uncured ultraviolet curable resin. With respect to the liquid crystal display device that is disposed, a light guide block that is disposed on the inside of the black frame of the cover glass and is mounted on the cover glass via a resin, and ultraviolet light is emitted from a side surface of the light guide block. An ultraviolet irradiation device for irradiating the light, wherein the side surface of the light guide block is not parallel to a main surface of the cover glass.

  (2) When the refractive index of the light guide block with respect to ultraviolet rays having a wavelength of 365 nm is n1, the refractive index of the mounting resin with respect to ultraviolet rays having a wavelength of 365 nm is n2, and the refractive index of the cover glass with respect to ultraviolet light having a wavelength of 365 nm is n3, The manufacturing apparatus according to (1), wherein the difference between n1 and n2 and n3 is selected to be within 0.01.

  (3) When the refractive index of the light guide block with respect to ultraviolet light having a wavelength of 365 nm is n1, and the refractive index of the mounting resin with respect to ultraviolet light having a wavelength of 365 nm is n2, n2 ≧ n1. Manufacturing equipment.

It is a top view of a liquid crystal display device. It is AA sectional drawing of FIG. It is sectional drawing which shows the problem at the time of hardening an ultraviolet curing resin with ultraviolet rays. This is one means for solving the problem shown in FIG. FIG. 5 is a sectional view showing a problem of the method shown in FIG. 4. FIG. 4 is a sectional view showing a problem in another method for solving the problem in FIG. 3. FIG. 1 is a cross-sectional view illustrating a configuration of the present invention. It is a detailed sectional view showing the composition of the present invention. FIG. 2 is a plan view illustrating a configuration of the first exemplary embodiment. It is BB sectional drawing of FIG. FIG. 9 is a plan view illustrating a configuration of a second embodiment. It is CC sectional drawing of FIG. FIG. 11 is a cross-sectional view illustrating another embodiment of the second embodiment. FIG. 9 is a cross-sectional view illustrating a configuration of a third embodiment. FIG. 13 is a cross-sectional view illustrating a configuration of a fourth embodiment.

  Hereinafter, the present invention will be described in detail with reference to Examples.

  FIG. 1 is a plan view of the liquid crystal display device, and FIG. 2 is a sectional view of the liquid crystal display device. In FIG. 1, a cover glass 300 is disposed on the upper side. Although the cover glass 300 is formed larger than the TFT substrate 100 in the liquid crystal display panel, this is an example, and the cover glass 300 may be the same size as the liquid crystal display panel or may be smaller than the liquid crystal display panel. is there.

  In FIG. 1, a black frame 301 is formed around the cover glass by printing so as to surround a transparent display area 302. The black frame 301 is formed on the side of the opposite substrate 200 of the cover glass 300. The width of the black frame 301 is larger on the terminal side of the liquid crystal display panel where the main flexible wiring board 120, the driver IC 110, and the like are arranged.

  FIG. 2 is a sectional view taken along line AA of FIG. In FIG. 2, the TFT substrate 100 and the counter substrate 200 are bonded with a sealant, and a liquid crystal is sandwiched between the TFT substrate 100 and the counter substrate 200. The TFT substrate 100 is formed larger than the counter substrate 200, and the portion where the TFT substrate 100 is integrated is a terminal portion, on which a driver IC 110 for driving a liquid crystal display panel is arranged. The main flexible wiring board 120 for supplying a power supply and a signal from is connected. The counter substrate 200 has a touch panel function, and a flexible wiring substrate for a touch panel 130 is connected to the counter substrate 200 for inputting and outputting signals to and from the touch panel.

  A lower polarizing plate 101 is attached below the TFT substrate 100, and an upper polarizing plate 201 is attached above the counter substrate 200. A liquid crystal display panel is constituted by the TFT substrate 100, the counter substrate 200, the lower polarizing plate 101, and the upper polarizing plate 201. A cover glass 300 is attached on the upper polarizing plate 201 with a resin 350. This is for mechanically protecting the liquid crystal display panel.

  In FIG. 2, the thickness of cover glass 300 is not less than 0.5 mm and not more than about 1.5 mm. The thickness of the TFT substrate 100 and the counter substrate 200 is about 0.2 mm to 0.7 mm, and the thickness of the upper polarizing plate 201 and the lower polarizing plate 101 is about 0.13 mm. The thickness of the ultraviolet curing resin 350 that bonds the upper polarizing plate 201 and the cover glass 300 is about 30 μm to about 170 μm.

  The ultraviolet curing resin 350 may be a liquid having a high viscosity at first, or may be a film. As the resin film, for example, OCA (Optical Clear Adhesive) is used, and as the initially liquid resin, for example, OCR (Optical Clear Resin) is used. In the following description, the ultraviolet curable resin 350 is described as being liquid before curing, but the content of the present invention can be similarly applied to a case where the ultraviolet curable resin 350 is initially a sheet.

  FIG. 3 is a cross-sectional view showing a problem in a curing step of the ultraviolet curable resin 350 when manufacturing the liquid crystal display device as shown in FIG. 1 or FIG. FIG. 3 is a sectional view on the terminal portion side. In FIG. 3, ultraviolet rays UV for curing the ultraviolet curing resin 350 are emitted from the main surface side of the cover glass 300. The ultraviolet light is a light source that emits ultraviolet light having a wavelength of 200 nm to 450 nm and a wavelength used for curing the ultraviolet curing resin 350, for example, a wavelength of 365 nm, using a metal halide lamp as a light source. The liquid crystal display panel is mounted on a mounting table of the manufacturing apparatus. A backlight may be provided on the back of the display panel, and the display device may be mounted on a mounting table of the manufacturing apparatus via the backlight.

  In FIG. 3, in a transparent display area where the black frame 301 does not exist, the ultraviolet ray UV is irradiated, so that the ultraviolet curable resin 350 is cured. However, the ultraviolet curable resin 350 is not cured in the portion where the black frame 301 is formed because the ultraviolet ray UV is not transmitted. This portion is indicated by an uncured resin 351 in FIG.

  FIG. 4 is a cross-sectional view showing a means for preventing this. In FIG. 4, ultraviolet rays UV are emitted from the side of the liquid crystal display device. As shown in FIG. 4, if there is no obstacle between the ultraviolet curable resin 350 and the ultraviolet curable UV, the ultraviolet curable resin 350 is irradiated with the ultraviolet curable resin 350 to cure the ultraviolet curable resin 350.

  However, especially on the terminal portion side, as shown in FIG. 5, when the ultraviolet ray UV is blocked by the flexible wiring board for a touch panel 130 or the like, the ultraviolet curable resin 350 in that portion is not cured and remains as an uncured resin 351. . In FIG. 5, the flexible wiring board for a touch panel 130 blocks the ultraviolet rays UV, but the main flexible wiring board 120 may block the ultraviolet rays.

  FIG. 6 is a cross-sectional view showing another means for curing the ultraviolet curing resin 350 below the black frame 301. In FIG. 6, ultraviolet rays UV are made to enter the main surface of the cover glass 300 at a small angle, for example, 2 °, so that the ultraviolet rays UV enter under the black frame 301. However, in this method, the ultraviolet rays UV are refracted at the interface between the cover glass and the air due to the refractive index of the cover glass 300, and the ultraviolet rays cannot enter the ultraviolet curing resin 350 at a small angle. In addition, the refractive index in this specification refers to a refractive index with respect to ultraviolet rays having a wavelength of 365 nm for curing the ultraviolet curing resin 350, unless otherwise specified.

  In FIG. 6, for example, even if the ultraviolet curable resin 350 enters the cover glass 300 at 2 °, the angle is 48 ° when exiting the cover glass 300. As a result, the ultraviolet rays UV enter the ultraviolet curable resin only a small distance d1 from the end of the black frame 301.

  In FIG. 6, when the refractive index of the air is 1.0, the refractive index of the cover glass is 1.52, the refractive index of the ultraviolet curable resin is 1.49, and the thickness of the ultraviolet curable resin is 0.1 mm, Even if UV is incident on the cover glass 300 at 2 °, the distance d1 is only 0.09 mm. Therefore, most of the ultraviolet curable resin 350 under the black frame 301 remains uncured.

  FIG. 7 is a sectional view showing the present invention. In FIG. 7, a light guide block 10 made of glass or the like is disposed on a cover glass 300 via a mounting resin 20. Then, ultraviolet rays UV for curing the ultraviolet curing resin 350 are made incident from the side surface of the light guide block 10.

  In FIG. 7, the ultraviolet rays UV are incident at a small angle, for example, 10 ° so as to enter from the side surface of the light guide block 10. The ultraviolet rays UV enter the cover glass 300 or the ultraviolet curable resin 350 at a smaller angle, for example, 6.8 °, due to the difference in the refractive index between the light guide block 10 and the air. In other words, contrary to the case of FIG. 6, the incident angle of the ultraviolet rays UV to the ultraviolet curable resin 350 can be made smaller than the incident angle of the ultraviolet rays UV to the cover glass 300 due to the presence of the light guide block 10. .

  7, the refractive index of the light guide block 10 is 1.52, which is the same as that of the cover glass 300, the refractive index of the mounting resin 20 is 1.52, which is the same as that of the cover glass, and the refractive index of the ultraviolet curing resin 350 is 1.49. When the thickness of the ultraviolet curable resin 350 is 0.1 mm, when the ultraviolet UV is incident on the cover glass 300 at 10 °, the distance d2 that the ultraviolet UV reaches the inside of the ultraviolet curable resin 350 is 0.84 mm. 6 is significantly larger than that of FIG. That is, the uncured area is significantly reduced.

  Further, when the ultraviolet rays UV are incident on the ultraviolet curable resin 350 at a small angle, the amount of light reflected at the interface between the ultraviolet curable resin 350 and the upper polarizing plate 201 also increases. In FIG. 7, the reflected light is indicated by a dotted line. Since the ultraviolet curing resin 350 is cured by the reflected light, the ultraviolet curing resin 350 can be cured in almost the entire region.

  In the present invention, the refractive index of each component is an important factor. FIG. 8 is a sectional view showing this relationship. 8, the refractive index of the light guide block 10 is n1, the refractive index of the mounting resin 20 is n2, the refractive index of the cover glass 300 is n3, the refractive index of the ultraviolet curing resin 350 is n4, and the refractive index of the upper polarizer 201 is n5. In FIG. 8, assuming that the angle at which the ultraviolet rays UV are incident on the side surface of the light guide block 10 is θ1 and the emission angle on the light guide block 10 side is θ2, n1 = sin θ1 / sin θ2. Since n1 is larger than the refractive index of air, θ2 always becomes smaller than θ1. That is, in the ultraviolet curable resin 350, the ultraviolet rays UV reach deeper. Note that angles such as θ1 and θ2 in the present specification indicate angles of the optical axis of the ultraviolet rays UV.

  In FIG. 8, in order to suppress reflection at the interface and allow more ultraviolet rays UV to reach the ultraviolet curing resin 350, it is desirable that the refractive indices n1, n2, n3, and n4 be the same as much as possible. As an actual value, the difference between the refractive indices n1, n2, n3, and n4 is preferably within 0.01.

  On the other hand, between the ultraviolet curing resin 350 and the upper polarizing plate 201, if the ultraviolet UV can be reflected on the surface of the upper polarizing plate 201, the ultraviolet UV can reach deeper. Therefore, n4 and n5 do not necessarily need to coincide with each other, and it is advantageous that the refractive index n4 of the ultraviolet curable resin 350 is larger than the refractive index n5 of the upper polarizing plate 201, since the ultraviolet light UV is reflected more.

  However, the refractive indices of the upper polarizing plate 201, the ultraviolet curing resin 350, and the cover glass 300 are often determined from the characteristics of the product. Therefore, the adjustment of the refractive index in the present invention is often limited to the refractive index n1 of the light guide block 10 and the refractive index n2 of the mounting resin 20.

  In such a case, it is desirable that the refractive index n1 of the light guide block 10 and the refractive index n2 of the mounting resin coincide with the refractive index n3 of the cover glass 300 within 0.01. Further, the ultraviolet light incident from the side surface of the light guide block 10 can be made to enter the main surface of the cover glass 300 at a sufficiently small angle, so that the interface between the light guide block 10 and the mounting resin 20 or the mounting resin 20 It is desirable that the conditions be such that total reflection is not performed at the interface between the cover glass 300 and the cover.

  In order not to cause total reflection, it is desirable that the relationship between the refractive index n1 of the light guide block 10 and the refractive index n2 of the mounting resin 20 be n2 ≧ n1. Alternatively, it is desirable that the relationship between the refractive index n2 of the mounting resin 20 and the refractive index n3 of the cover glass 300 is n3 ≧ n2.

  FIG. 9 is a plan view showing the positional relationship between the light guide block 10 and the liquid crystal display panel. In FIG. 10, the light guide block 10 is arranged on the cover glass 300 so as to partially overlap the black frame 301. The light guide block 10 is arranged on a terminal side of the liquid crystal display panel. The width b of the light guide block 10 is the same as the width of the cover glass 300. Note that the width b of the light guide block 10 may be smaller than the width of the cover glass as long as the ultraviolet rays UV can be irradiated from the lateral direction on the long side of the cover glass 300 as shown in FIG. The depth a of the light guide block 10 is 20 ± 10 mm. If the depth a is too small, light passing through the light guide block 10 will not reach the ultraviolet curable resin 350, and if it is too long, absorption of ultraviolet light in the light guide block 10 will be a problem.

  FIG. 10 is a sectional view taken along line BB of FIG. In FIG. 10, the height t1 of the light guide block 10 is about 1.4 mm to about 15 mm. If the light guide block 10 is too thin, the ultraviolet rays UV cannot be sufficiently incident from the side surface of the light guide block 10. If the light guide block 10 is too thin, handling becomes difficult. Furthermore, even if the light guide block 10 is too thick, handling becomes difficult. The most suitable material for the light guide block 10 is glass. However, if the refractive index can be adjusted and ultraviolet absorption is small, a transparent plastic may be used.

  The mounting resin 20 interposed between the light guide block 10 and the cover glass 300 may be any resin as long as the refractive index can be matched. Even if the resin is liquid, it can be interposed between the light guide block 10 and the cover glass 300 by surface tension. It is sufficient that the thickness of the mounting resin 20 is about 10 μm to 30 μm. There is no problem if the amount of the mounting resin 20 is within a range that can be maintained by the surface tension. Since the mounting resin 20 is removed after being irradiated with ultraviolet rays, a material that can be easily wiped off is preferable. For example, paraffin oil or the like can be used.

  In addition, as the mounting resin 20, OCA which is an ultraviolet curing resin can be used. OCA is cured by irradiating ultraviolet rays, but since the surface of the cover glass is coated with fluorine, the OCA can be easily peeled off even after curing, so that the step of peeling off the mounting resin 20 becomes easy. . If the light guide block 10 is also coated with fluorine, the mounting resin 20 can be easily removed from the light guide block 10.

  On the other hand, the mounting resin 20 may be a sheet-like resin. In this case, it is preferable that the sheet-like resin can be easily peeled off after being attached to the cover glass 300 and irradiated with ultraviolet rays UV through the light guide block 10. And what can be used several times is good.

  Whether the mounting resin 20 is a liquid or a sheet, the important point is that when the light guide block 10 is placed on the cover glass 300 via the mounting resin 20, the light guide block 10 and the cover It is important that the material does not easily generate air bubbles with the glass 300. This is because, when air bubbles are generated, the ultraviolet rays UV are greatly refracted at those portions, and the ultraviolet rays UV may not reach the interior of the ultraviolet curing resin 350 in some cases.

  FIG. 11 is a plan view of a second embodiment of the present invention, and FIG. 12 is a cross-sectional view taken along the line CC of FIG. As shown in FIG. 11, the outer shape, a, and b of the light guide block 10 are the same as those in FIG. This embodiment differs from FIGS. 9 and 10 of the first embodiment in that, as shown in FIG. 12, the side surface of the light guide block 10 on the side where the ultraviolet rays UV are incident is θ3 with respect to the normal direction of the cover glass 300. It is a point that is inclined. This inclination θ3 is equal to the angle of the ultraviolet rays UV incident on the light guide block 10 with respect to the surface of the cover glass 300.

  Therefore, the ultraviolet rays UV incident on the side surface of the light guide block 10 are perpendicular to the side surface of the light guide block 10, and the reflection can be reduced. The value of θ3 is larger than 0 and equal to or smaller than 15 °. More preferably, the angle is 10 ° or less. The height of the light guide block 10, the thickness of the mounting resin 20, and the like are the same as those described in the first embodiment.

  FIG. 13 is a sectional view showing another embodiment of the present example. FIG. 13 differs from FIG. 12 in that the cross section of the light guide block 10 is not a trapezoid but a triangle. Also in FIG. 13, the side surface on which the ultraviolet rays UV are incident is inclined by θ3 with respect to the normal of the cover glass 300 as in FIG. Thereby, reflection of the ultraviolet rays UV on the incident surface of the light guide block 10 can be suppressed, and the exposure efficiency can be improved. The width, depth, height, and the like of the light guide block 10 in the present embodiment are the same as those described with reference to FIGS.

  In some cases, a protective sheet 400 is attached to the cover glass 300 to protect the surface of the cover glass 300 of the liquid crystal display device. In this case, the ultraviolet curable resin 350 is cured by irradiating ultraviolet rays UV with the protective sheet 400 attached. FIG. 14 is a cross-sectional view illustrating the configuration of the present example. FIG. 14 differs from FIG. 10 of the first embodiment in that a protective sheet 400 having a refractive index n6 is interposed between the mounting resin 20 for disposing the light guide block 10 and the cover glass 300.

  Also in the case of the configuration in FIG. 14, the refractive indices of the upper polarizing plate 201, the ultraviolet curing resin 350, the cover glass 300, and the protective sheet 400 are often determined from the characteristics of the product. The protection sheet 400 may be formed of, for example, PET (polyethylene terephthalate) having a refractive index of 1.56 to 1.57 with respect to ultraviolet rays UV. Therefore, the adjustment of the refractive index in the present invention is often limited to the refractive index n1 of the light guide block 10 and the refractive index n2 of the mounting resin 20.

  In such a case, it is desirable that the refractive index n1 of the light guide block 10 and the refractive index n2 of the mounting resin 20 coincide with the refractive index n6 of the protective sheet 400 within 0.01. Further, since the ultraviolet rays UV incident from the side surface of the light guide block 10 can be incident at a sufficiently small angle with respect to the main surface of the cover glass 300, the interface between the light guide block 10 and the mounting resin 20 or the mounting resin It is desirable that the conditions be such that total reflection does not occur at the interface between the protective sheet 20 and the protective sheet 400.

  In order not to cause total reflection, it is desirable that the relationship between the refractive index n1 of the light guide block 10 and the refractive index n2 of the mounting resin is n2 ≧ n1. Alternatively, it is desirable that the relationship between the refractive index n2 of the mounting resin 20 and the refractive index n6 of the protective sheet 400 is n6 ≧ n2.

  As described above, even when the protective sheet 400 is present on the cover glass 300, by applying the present invention, the ultraviolet curable resin 350 can be cured even under the black frame 301.

  This embodiment is an example in which the present invention is applied to an organic EL display device. FIG. 15 is a cross-sectional view of the organic EL display device in a state where the present invention is implemented. The organic EL display panel has a configuration in which an element substrate 500 on which organic EL elements and the like are formed is covered with a sealing substrate 600 via a sealing resin. The element substrate 500 is formed to be larger than the sealing substrate 600, a driver IC 110 is attached to a part where the element substrate 500 is integrated, and a main flexible element for supplying power and signals to the organic EL display panel. The wiring board 120 and the like are connected.

  The sealing substrate 600 also serves as a touch panel, and a flexible wiring substrate 130 for a touch panel is connected to the sealing substrate 600. A polarizing plate 601 for preventing reflection is mounted on the sealing substrate 600. However, depending on the organic EL display device, there may be no polarizing plate for preventing reflection.

  In FIG. 15, a cover glass 300 for protecting the organic EL display panel is bonded on a sealing substrate 600 via an ultraviolet curing resin 350. A black frame 301 is formed around the cover glass 300 in the same manner as in the liquid crystal display device shown in FIGS.

  That is, also in the case of the organic EL display device, there is a problem that the ultraviolet curable resin 350 below the black frame 301 of the cover glass 300 is not cured. In order to solve this problem, as shown in FIG. 15, the light guide block 10 is arranged on the cover glass 300 via the mounting resin 20, and ultraviolet light UV is irradiated from the side surface of the light guide block 10. It is possible to irradiate the ultraviolet rays UV to the lower side of the black frame 301.

  That is, the contents of the present invention described in Embodiments 1 to 3 can be applied to an organic EL display device as it is. This can solve the problem that the ultraviolet curable resin below the black frame is not cured even in the organic EL display device.

  In the above embodiment, the light guide block is arranged on the cover glass on the terminal side of the display panel and is irradiated with ultraviolet light. However, when the TFT substrate or the opposing substrate becomes thin, the substrate is bent, and it may be difficult to irradiate ultraviolet light from the lateral direction as shown in FIG. In such a case, it is possible to uniformly cure the ultraviolet curable resin by disposing the light guide block not only on the side of the terminal portion but also on the other side of the cover glass.

  DESCRIPTION OF SYMBOLS 10 ... Light guide block, 20 ... Mounting resin, 100 ... TFT board, 101 ... Lower polarizing plate, 110 ... Driver IC, 120 ... Main flexible wiring board, 130 ... Flexible wiring board for touch panels, 200 ... Counter substrate, 201 ... Top Polarizing plate, 300: cover glass, 301: black frame, 302: display area, 350: ultraviolet curing resin, 351: uncured portion, 400: protective sheet, 500: element substrate, 600: sealing substrate, 601: anti-reflection Polarizing plate, UV ... UV

Claims (4)

A display panel, a display device in which a cover glass having a transparent portion and a black frame is adhered by an ultraviolet curable resin, and a protective sheet is adhered to a surface of the cover glass,
  For the display device in which a cover glass is disposed on the surface of the display panel via an ultraviolet curable resin,
  The light guide block
  It is arranged inside the black frame of the cover glass, and the ultraviolet light incident from the side surface of the light guide block through the mounting resin on the cover glass is irradiated to the ultraviolet curing resin under the black frame,
  The display device having a light guide block, wherein the side surface of the light guide block is inclined with respect to a main surface of the cover glass. When the refractive index of the light guide block with respect to the ultraviolet rays is n1, the refractive index of the mounting resin with respect to the ultraviolet rays with a wavelength of 365 nm is n2, and the refractive index of the protective sheet with respect to the ultraviolet rays with a wavelength of 365 nm is n3, n1 and n2 are The display device having a light guide block according to claim 1, wherein the difference from n3 is selected to be within 0.01. 2. The light guide according to claim 1, wherein n2 ≧ n1, where n1 is a refractive index of the light guide block for ultraviolet light having a wavelength of 365 nm and n2 is a refractive index of ultraviolet light of the mount resin for ultraviolet light having a wavelength of 365 nm. A display device having a block. 2. The light guide block according to claim 1, wherein n3 ≧ n2, where n2 is a refractive index of the mounting resin with respect to ultraviolet light having a wavelength of 365 nm, and n3 is a refractive index of ultraviolet light of the protective sheet with respect to ultraviolet light having a wavelength of 365 nm. A display device having:

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