JP4212509B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device that secures good display properties by fixing the positional relationship between a liquid crystal panel and a light control sheet material.

  Conventionally, among various devices such as a portable personal computer and a television device, there is a device using a liquid crystal display device as a display unit. Many liquid crystal display devices have a structure in which a light control sheet material and a light guide plate are superimposed on a liquid crystal panel.

  FIG. 9A is a schematic view showing an exploded state of a conventional general liquid crystal display device 1. In the liquid crystal display device 1, the liquid crystal panel 2, the light control sheet material 6, and the light guide plate 7 are accommodated in a state in which the liquid crystal panel 2, the light control sheet material 6, and the light guide plate 7 are superposed inside a housing 9 in which a reflection sheet (not shown) is disposed on the bottom surface. The housing 9 has lamps 8 arranged at the corners inside, and a claw portion 9b protruding from the inner side of the surrounding side wall 9a. The liquid crystal panel 2 has a frame portion 2a attached to the periphery thereof, and a locking portion 2b is provided in the frame portion 2a. The light control sheet material 6 is formed by laminating a total of three sheets, a lens sheet 3 having a concavo-convex portion 3 a formed on one surface, a brightness enhancement sheet 4, and a diffusion sheet 5.

  FIG. 9B is a schematic view showing an assembly state of the liquid crystal display device 1, and the light control sheet material 6 formed of the liquid crystal panel 2, the respective sheets 3 to 5, and the light guide plate 7 are formed inside the housing 9. Overlapping, the lamp 8 is positioned on the side surface of the light guide plate 7. The claw portion 9 b of the housing 9 engages the engaging portion 2 b of the frame portion 2 a of the liquid crystal panel 2, and by this engagement, the peripheral portions of the liquid crystal panel 2, the light control sheet material 6, and the light guide plate 7 are located in the housing 9. It is fixed in a clamped state. In many cases, the liquid crystal television apparatus has a configuration in which a lamp is disposed so as to face the light control sheet material 6 instead of the light guide plate 7.

In addition, as a structure different from the conventional general liquid crystal display device described above, a diffusion adhesive sheet having a diffusion adhesive layer containing an adhesive and a filler, a liquid crystal panel and a light reflecting material, a liquid crystal panel and a prism sheet, or A liquid crystal display device having a configuration in which either a prism sheet or a light reflecting plate is bonded is disclosed (see Patent Document 1).
Furthermore, a liquid crystal display device in which an antiglare layer having fine irregularities is formed by applying a large number of spherical silica particles on the lower surface of the lower polarizing plate attached to the lower surface of the lower transparent glass substrate constituting the liquid crystal panel is also disclosed. (See Patent Document 2).

Furthermore, a front integrated transparent touch panel in which a lower electrode plate and a light guide plate of a transparent touch panel are bonded with an adhesive layer is disclosed (see Patent Document 3).
Moreover, regarding the diffusion sheet 5 contained in the light control sheet material 6 mentioned above, it is disclosed by the following patent documents 4-6.
JP-A-11-223712 Japanese Patent Laid-Open No. 10-96922 JP 2000-162594 A JP-A-4-303802 Japanese Patent Laid-Open No. 7-5306 Japanese Utility Model Publication No. 6-76901

  In recent years, liquid crystal display devices used in television broadcast receivers and the like have become larger in display screen. As the display screen is increased in size in this way, problems related to the light control sheet material 6 that have not become apparent with the conventional screen size have come to appear. Specifically, since the sheets 3 to 5 constituting the light control sheet material 6 are also enlarged with an increase in the size of the display screen, there is a problem that the flatness of the entire sheet is deteriorated. When the flatness deteriorates in this way, there is a problem that the display on the liquid crystal panel is partially brightened or darkened and the display quality of the liquid crystal display device is degraded.

  Each sheet 3 to 5 expands due to the influence of heat generated by the lamp 8, but the vicinity of the center that is not clamped due to the increase in the size of the sheet has a large degree of freedom, and thus is easily bent due to expansion. In addition, since the materials of the sheets 3 to 5 are different from each other, the thermal expansion coefficients of the sheets 3 to 5 are also different. For example, as shown in FIG. The degree of bending with the sheet 5 may be different, or as shown in FIG. 10B, the sheets 4 and 5 may bend in directions away from each other. When the sheets 4 and 5 are bent as described above, the positional relationship with respect to the liquid crystal panel 2 is deviated from the specified state, and a bright portion or a dark portion is generated on the display screen as in the case of the above-described deterioration of flatness. . FIGS. 10A and 10B exaggerate the actual bending state.

  Furthermore, since the weight of each sheet itself increases as each sheet 3-5 increases in size, the problem that each sheet 3-5 cannot be reliably positioned only by clamping each sheet 3-5 only at the peripheral portion. There is. Therefore, for example, when the liquid crystal display device 1 is transported by a truck, a train, or the like, the sheets 3 to 5 are displaced in a slippery manner due to the influence of vibration accompanying the transportation, and the display quality as prescribed cannot be maintained. Occurs. In particular, the lens sheet 3 having the uneven portion 3a on the surface is sensitive to the positional deviation because the positional relationship with the liquid crystal panel 2 is sensitive.

  It is generally known to increase the sheet rigidity by increasing the thickness dimension of each of the sheets 3 to 5 as a countermeasure against deterioration of flatness and bending. However, as the thickness of each sheet 3-5 increases, the degree of attenuation of light passing through each sheet 3-5 increases, and misalignment due to an increase in sheet weight is likely to occur. It is not an effective measure.

  In addition, since the liquid crystal panel 2, the sheets 3 to 5 of the light control sheet 6, and the light guide plate 7 are separate bodies, it is necessary to sequentially store them in the housing 9, and efficient assembly cannot be performed. There is also a problem.

  It can also be assumed that the diffusion adhesive sheet of the liquid crystal display device according to Patent Document 1 is applied to each of the problems described above. However, since the diffusion adhesive sheet has a light diffusion function, the function overlaps with the diffusion sheet 5 of the light control sheet material 6, and the light control sheet material 6 cannot exhibit the required optical characteristics. In this case, the diffusion adhesive sheet may be used in place of the diffusion sheet 5. However, in the stacking order of the light control sheet material 6, the diffusion adhesive sheet is a lens sheet 3 that is most likely to be affected by positional deviation. Since it cannot be pasted, the problem of misalignment related to the lens sheet 3 cannot be completely solved. Further, if the diffusion adhesive sheet is used for all of the space between the liquid crystal panel and each sheet to eliminate the positional deviation, the diffusion of light passing through each diffusion adhesive sheet becomes excessive, and the required display quality cannot be maintained. Therefore, the configuration according to Patent Document 1 cannot solve all the problems described above.

  The present invention has been made in view of such a problem, and based on a configuration in which a conventional liquid crystal panel and each sheet are superposed, a liquid crystal panel, a light control sheet material, and each sheet of the light control sheet material, etc. An object of the present invention is to provide a liquid crystal display device that can position the image sensor, prevent bending and deterioration of flatness, and ensure predetermined display performance.

In order to solve the above problems, a liquid crystal display device according to the present invention is a liquid crystal display device in which a light control sheet material in which a plurality of sheets are stacked is superimposed on a liquid crystal panel, and the liquid crystal panel and the light control sheet material are transparent adhesives. Yes bonded to entirely the dosage, the sheets each other dimming sheet material, Ri Awasetea laminated to entirely transparent adhesive sheet laminated on the liquid crystal panel side among the plurality of sheets, a liquid crystal panel in a lens sheet which uneven portions on the surface are it is formed overlaying the convex portion of the lens sheet, wherein the tare Rukoto fixed to the liquid crystal panel with a transparent adhesive.

In the present invention, the light control panel, the light control sheet material, and the sheets of the light control sheet material are bonded together entirely with a transparent adhesive, whereby the light control panel, the light control sheet material, and the light control sheet Misalignment between the sheets of the material does not occur. Further, by bonding the sheets of the light control sheet material, the light control sheet material is integrated, and the overall rigidity is improved, and the flatness can be prevented from deteriorating. Furthermore, by sticking the light control sheet material and the liquid crystal panel, it is possible to suppress bending of the light control sheet material, and in addition, the liquid crystal panel and the light control sheet material can be integrated into the housing at a time. As a result, the assemblability can be improved.
Moreover, since the convex part of the lens sheet is fixed to the liquid crystal panel with a transparent adhesive, it can be avoided that the transparent adhesive interferes with the light condensing and light diffusing functions that occur in the uneven part of the lens sheet. Even if it exists, the optical properties of the lens sheet can be sufficiently exhibited.

  In addition, the transparent adhesive which concerns on this invention does not contain the substance like a filler for diffusing light. In addition, the transparent adhesive preferably has a small thickness in order to suppress light attenuation, and is preferably as thin as possible within a range of, for example, 20 μm to 150 μm. Moreover, it is necessary to select a transparent adhesive having a refractive index in the range of 1.15 to 1.9 from the viewpoint of ensuring a predetermined display performance, and a transparent adhesive having a refractive index close to the refractive index of each sheet. When the agent is applied, the liquid crystal display device can be easily designed.

The liquid crystal display device according to the present invention is characterized in that the transparent adhesive is in the form of a sheet.
In the present invention, by using the sheet-like transparent adhesive, the thickness dimension of the transparent adhesive can be made constant accurately, and each sheet of the liquid crystal panel, the light control sheet material, and the light control sheet material It is possible to efficiently perform the process related to the bonding between the two.

The liquid crystal display device according to the present invention is characterized in that the transparent adhesive has a line-shaped unevenness formed on a sheet-like adhesive surface.
In the present invention, by forming line-shaped irregularities on the adhesive surface of the transparent adhesive, it is possible to securely fix the adhesive at the convex portion of the adhesive surface, and the presence of the concave portion where the thickness is reduced. The influence on the passage can be reduced. In particular, in bonding to a lens sheet with an uneven portion, it is possible to reliably avoid filling the concave portion of the lens sheet with a transparent adhesive by providing unevenness on the adhesive surface. Contribute to maintenance.

The liquid crystal display device according to the present invention is characterized in that the transparent pressure-sensitive adhesive has lattice-like irregularities formed on a sheet-like pressure-sensitive adhesive surface.
In the present invention, by forming a grid-like unevenness on the adhesive surface of the transparent adhesive, a large number of concave portions can be provided, and the influence on attenuation of light passing through the transparent adhesive can be further reduced. become.

The liquid crystal display device according to the present invention is characterized in that a light guide plate is superimposed on a light control sheet material, and the light control sheet material and the light guide plate are bonded together with a transparent adhesive.
In the present invention, the light control sheet material and the light guide plate are bonded together with a transparent adhesive, so that the positional shift of the light control sheet and the light guide plate can be suppressed, from the light control panel to the light guide plate. As a result, the positional accuracy can be improved and the assembly efficiency can be further improved.

The liquid crystal display device according to the present invention is characterized in that a lamp is disposed so as to face the surface opposite to the surface on which the liquid crystal panel of the light control sheet material is superimposed.
In the present invention, by disposing the lamp so as to face the light control sheet material, the present invention can be applied to a configuration frequently used in a liquid crystal television device.

  In the present invention, the light control panel, the light control sheet material, and the sheets of the light control sheet material are bonded together with a transparent adhesive, so that the light control panel, the light control sheet material, and the misalignment between the sheets. In addition, the overall rigidity of the light control sheet material can be improved to prevent deterioration of flatness, and the light control sheet material can be prevented from being bent. A predetermined display performance can be maintained.

Moreover, in this invention, the optical characteristic which a lens sheet has is securable even if a transparent adhesive exists by fixing the convex part of a lens sheet to a liquid crystal panel with a transparent adhesive.
Furthermore, in the present invention, by using the sheet-like transparent adhesive, the thickness dimension of the transparent adhesive can be made constant with high accuracy, and the bonding step for the liquid crystal panel, the light control sheet material, and each sheet, etc. Can be done efficiently.

Furthermore, in the present invention, by forming the line-shaped unevenness on the adhesive surface of the transparent adhesive, it is possible to reliably fix the adhesive at the convex portion of the adhesive surface, and also due to the presence of the concave portion where the thickness is reduced. The degree of attenuation of light passing through the transparent adhesive can be suppressed.
Moreover, in this invention, by forming a grid | lattice-like unevenness | corrugation in the adhesive surface of a transparent adhesive, a recessed part can be increased more and the influence which concerns on a transparent adhesive can further be suppressed.

Further, in the present invention, the light control sheet material and the light guide plate are bonded together with a transparent adhesive, whereby the positional deviation of the light control sheet and the light guide plate can be suppressed, and from the light control panel to the light guide plate. It is possible to improve the positional accuracy and assemblability by fixing them integrally.
Furthermore, in the present invention, by arranging the lamp so as to face the light control sheet material, the configuration according to the present invention can be applied to the liquid crystal television apparatus, and the predetermined display performance can be achieved even when the screen size is increased. This contributes to the provision of LCD television devices that maintain the above.

  FIG. 1 is a schematic view of a liquid crystal display device 10 according to the first embodiment of the present invention. The liquid crystal display device 10 of the present embodiment has the same basic structural members as the conventional liquid crystal display device 1 shown in FIG. 9B, and the respective structural members are bonded together with the transparent adhesive 11. It is a feature.

  In the liquid crystal display device 10, the light guide plate 17, the light control sheet material 16, and the liquid crystal panel 12 are stacked and housed in a housing 19 provided with a reflection sheet (not shown) on the bottom surface. The lamp 18 is disposed so as to face the side surface. The light control sheet material 16 is formed by laminating a lens sheet 13, a brightness enhancement sheet 14, and a diffusion sheet 15. In addition, an uneven portion 13 a is formed on the surface of the lens sheet 13 that overlaps the liquid crystal panel 12.

  The lower surface of the liquid crystal panel 12 and the upper surface of the lens sheet 13 of the light control sheet 16, the lower surface of the lens sheet 13 and the upper surface of the brightness enhancement sheet 14, the lower surface of the brightness enhancement sheet 14 and the upper surface of the diffusion sheet 15, and the upper surface of the diffusion sheet 17. Are respectively bonded together with a transparent adhesive 11. The transparent pressure-sensitive adhesive 11 is an acrylic pressure-sensitive adhesive formed in a sheet shape, and has a refractive index of about 1.45 and a thickness dimension of 25 μm. Note that the transparent adhesive 11 has adhesive surfaces on both sides, and does not contain a light diffusing substance such as a filler. Moreover, as the transparent adhesive 11, one having a refractive index within a range of about 1.1 or more and about 1.9 or less can be applied.

  FIG. 2 is an enlarged view of a main part showing a bonded state of the liquid crystal panel 12 and the lens sheet 13 with the transparent adhesive 11. In the lens sheet 13, the tip of the convex portion 13 b in the concavo-convex portion 13 a is recessed from the transparent adhesive 11, whereby the convex portion 13 b is fixed to the liquid crystal panel 12 with the transparent adhesive 11. Further, since the transparent adhesive 11 is in the form of a sheet, it does not fill the concave portion 13c of the lens sheet 13, and does not hinder the light collecting and light diffusing functions of the concave and convex portion 13a of the lens sheet 13. Since the convex portion 13b of the lens sheet 13 is formed on one surface facing the liquid crystal panel 12, the surface on which the concave and convex portion 13a of the lens sheet 13 is formed by fixing with the transparent adhesive 11 as described above is the entire surface. Therefore, it is attached to the liquid crystal panel 12.

  Moreover, the transparent adhesive 11 has bonded the surfaces of both members facing each other between the sheets 13 to 16 of the light control sheet material 16 and between the diffusion sheet 15 and the light guide plate 17. The sheets 13 to 16 and the light guide plate 17 are surface-constrained and integrated.

  As shown in FIG. 1, a frame portion 12 a provided with a locking portion 12 b is attached around the liquid crystal panel 12 superimposed on the uppermost portion, and a claw portion provided on the side wall 19 a of the housing 19. 19b is locked to the locking portion 12b. As a result, the liquid crystal panel 12, the light control sheet material 16, and the periphery of the light guide plate 7 are fixed to the housing 19.

  Since the liquid crystal display device 10 of the present embodiment is configured as described above, the liquid crystal panel 12, the light control sheet material 16, and the light guide plate 7 are integrated, and only the peripheral portion is fixed to the housing 19. The light control sheet material 16 is not misaligned with respect to the liquid crystal panel 12 and the light guide plate 17, and is not misaligned between the sheets 13 to 15 forming the light control sheet material 16. Moreover, since each sheet 13-15 is bonded together, the light control sheet material 16 also improves the overall rigidity and prevents the flatness from deteriorating. Further, the light control sheet material 16 is difficult to bend by being bonded to the upper and lower liquid crystal panels 12 and the light guide plate 17, and the situation shown in FIGS. 10A and 10B does not occur. Furthermore, when the liquid crystal display device 10 is assembled, the integrated liquid crystal panel 12, the light control sheet material 16, and the light guide plate 7 can be simultaneously housed in the housing 19, and the assemblability is improved.

  The liquid crystal display device 10 is not limited to the above-described form, and various modifications can be applied. For example, the transparent adhesive 11 does not bond the liquid crystal panel 12 and the light control sheet material 16, the light control sheet material 16 and the light guide plate 17, and all the portions of the sheets 13 to 15 forming the light control sheet material 16. It is also possible to omit the bonding of the transparent adhesive 11 between members that have little influence on the display performance. For example, even if a positional deviation occurs between the diffusion sheet 15 and the light guide plate 17, since the influence on the diffusion of light by the diffusion sheet 15 is small, the bonding with the transparent adhesive 11 can be omitted. On the other hand, since the positional relationship of the lens sheet 13 with respect to the liquid crystal panel 12 is sensitive, the bonding with the transparent adhesive 11 between the lens sheet 13 and the liquid crystal panel 12 cannot be omitted.

  In addition, since the lens sheet 13 and the brightness enhancement sheet 14 may be integrated in the sheet forming the light control sheet material 16, in such a case, the lens sheet 13 that also functions as the brightness enhancement sheet is diffused. The light control sheet material 16 is formed with the sheet 15, and the lens sheet 13 and the diffusion sheet 15 are bonded together with the transparent adhesive 11.

  Furthermore, it is also possible to apply a general-purpose transparent adhesive tape or transparent adhesive sheet to the transparent adhesive 11, for example, a thickness of 25 μm and a transmittance of 92.4% (value when a slide glass is bonded) A transparent double-sided adhesive tape (CS9621: manufactured by Nitto Denko) of acrylic pressure-sensitive adhesive may be used.

  Furthermore, you may make it use the transparent adhesive 11 formed in the required thickness dimension t by the leveling process as shown in FIG. In this leveling step, the raw material Z is passed between the rollers R1 and R2 to form the sheet-like transparent adhesive 11, and various thickness dimensions t can be adjusted by adjusting the gap size between the rollers R1 and R2. The transparent adhesive 11 can be accurately formed into a sheet shape. In the present invention, considering that the thickness of each sheet 13 to 15 applied to the light control sheet material 16 is about 150 μm to about 250 μm, the thickness t of the transparent adhesive 11 should be in the range of 20 μm to 150 μm. In order to suppress the degree of light attenuation due to the passage of the transparent adhesive 11, it is preferable to set the thickness dimension t in the range of 20 μm to 50 μm.

  In addition, in FIG. 3, illustration of the release paper arrange | positioned on both surfaces of the sheet-like transparent adhesive 11 is abbreviate | omitted. Further, by using an uneven embossed type for the release paper, it is possible to form unevenness on the adhesive surface of the sheet-like transparent adhesive.

  FIG. 4 is a schematic view showing a liquid crystal display device 20 of a modified example to which a transparent adhesive 21 having irregularities formed on one adhesive surface is applied. As shown in FIG. 5, in the transparent adhesive 21, convex portions 21a and concave portions 21b are alternately formed on the base sheet portion 21c, and the convex portions 21a and concave portions 21b extend in a line in one direction. Each provided in parallel and spaced apart. Such a transparent adhesive 21 can be formed by using embossed release paper having irregularities corresponding to the convex portions 21a and the concave portions 21b.

  In the liquid crystal display device 20 of the modified example, the sheet portion 21 c of the transparent adhesive 21 is attached to the lower surface of the liquid crystal panel 12, and the uneven adhesive surface of the transparent adhesive 21 is formed on the upper surface of the lens sheet 13 of the light control sheet material 16. It is pasted. The transparent adhesive 21 is also attached to the lens sheet 13 and the brightness enhancement sheet 14, the brightness enhancement sheet 14 and the diffusion sheet 15, and the diffusion sheet 15 and the light guide plate 17 in the same manner as described above.

  By using the transparent adhesive 21 having such an uneven adhesive surface, an air layer is formed in the concave portion 21b, and the air layer has a refractive index of air (1.0). The optical characteristics of the sheets 13 to 15 are not substantially impaired.

  FIG. 6 is a main part enlarged view showing a state in which the transparent adhesive 21 of the modified example is attached to the uneven portion 13 a of the lens sheet 13. The convex portion 21a of the transparent adhesive 21 fixes the tip of the convex portion 13b of the lens sheet 13 and does not touch the concave portion 13c. Further, an air layer is interposed in the concave portion 21b of the transparent adhesive 21, so that the optical characteristics of light collection and diffusion by the concave and convex portion 13a of the lens sheet 13 are not further hindered. In addition, since the pitch of the uneven portion 13a of the lens sheet 13 and the uneven pitch of the transparent adhesive 21 are different, some of the convex portions 21a of the transparent adhesive 21 do not touch the lens sheet 13. (The convex portion 21a at the right end in FIG. 6) and the numerous convex portions 13b of the lens sheet 13 are adhered to the numerous convex portions 21a, so that a required bonding force can be ensured. Moreover, it is preferable that the uneven pitch of the transparent adhesive 21 is set in a range of about 40 μm to about 100 μm from the relationship with the pitch of the uneven portion 13 a of the lens sheet 13.

  FIG. 7 shows a transparent adhesive 31 in which another uneven shape is formed on one adhesive surface. In this transparent pressure-sensitive adhesive 31, irregularities including convex portions 31 a and concave portions 31 b arranged in a lattice shape are formed on the base portion 31 c. The transparent adhesive 31 having such a shape can also be formed by using an embossed release paper having irregularities corresponding to the convex portion 31a and the concave portion 31b. Moreover, when the liquid crystal panel 12 and the light control sheet material 16, the light control sheet material 16, the light guide plate 17, and each sheet 13-15 of a light control sheet material are bonded together with the transparent adhesive 31, the transparent adhesive shown in FIG. An air layer can be formed in more parts than the agent 21, and the extent to which the optical properties of the sheets 13 to 15 are impaired can be further reduced.

  FIG. 8 is a schematic view showing a liquid crystal display device 50 according to the second embodiment of the present invention. The liquid crystal display device 50 of the second embodiment has a structure applied to a large liquid crystal television device or the like, and a light guide plate is provided on the surface of the light control sheet material 56 opposite to the surface on which the liquid crystal panel 52 is superimposed. Instead, a plurality of lamps 58 are arranged to face each other. The liquid crystal panel 52, the lens sheet 53 of the light control sheet material 56, and the sheets of the light control sheet material 56 are bonded together with a transparent adhesive 51, as in the first embodiment. In addition, the characteristic of the transparent adhesive 51 used in 2nd Embodiment is the same as that of 1st Embodiment.

  Further, the housing 59 has a clip portion 59f for fixing each lamp 58 protruding from an inner bottom surface 59d, and a support portion 59e for supporting the bottom surface of the light control sheet material 56 from the vicinity of the center of the bottom surface 59d. Yes. Further, the housing 59 has a receiving portion 59c protruding from the inner side of the side wall 59a at the same height as the support portion 59e. The portions other than the above-described portion of the housing 59 are the same as those in the first embodiment, and a claw portion 59b is provided at the inner upper end of the side wall 59a to be engaged with the engaging portion 52b of the frame portion 52a of the liquid crystal panel 52. .

  The liquid crystal panel 52 and the light control sheet material 56 housed in the housing 59 are placed on the support portion 59e and the receiving portion 59c of the housing 59 with the bottom surface of the light control sheet material 56, and at the outer periphery by the locking of the claw portions 59b. A portion is fixed to the housing 59. In addition, since the liquid crystal panel 52 and the light control sheet material 56 are integrated by the transparent adhesive 51 and the rigidity is improved as compared with the conventional one, the positional deviation and the bending of each sheet hardly occur, and the flatness is also deteriorated. It is suppressed. The liquid crystal display device 50 according to the second embodiment can also be applied to various modifications according to the first embodiment.

1 is a schematic view showing a liquid crystal display device according to a first embodiment of the present invention. It is a principal part enlarged view of the liquid crystal display device of 1st Embodiment. It is a figure which shows the leveling process which concerns on formation of a sheet-like transparent adhesive. It is the schematic which shows the liquid crystal display device which concerns on the modification of 1st Embodiment. It is a perspective view which shows a part of transparent adhesive which concerns on a modification. It is a principal part enlarged view of the liquid crystal display device which concerns on a modification. It is a perspective view which shows a part of transparent adhesive which concerns on another modification. It is the schematic which shows the liquid crystal display device of 2nd Embodiment. (A) is the schematic which shows the decomposition | disassembly state of the conventional liquid crystal display device, (b) is the schematic which shows an assembly state. (A) and (b) are schematic diagrams showing conventional problems.

Explanation of symbols

1, 10, 20, 50 Liquid crystal display device 2, 12, 52 Liquid crystal panel 3, 13, 53 Lens sheet 3a, 13a Concavity and convexity 4, 14, 54 Brightness improving sheet 5, 15, 55 Diffusion sheet 6, 16, 56 Tone Light sheet material 7, 17 Light guide plate 8, 18, 58 Lamp 9, 19, 59 Housing 11, 21, 31, 51 Transparent adhesive 21a, 31a Convex part 21b, 31b Concave part

Claims (6)

In a liquid crystal display device in which a light control sheet material in which a plurality of sheets are laminated is superimposed on a liquid crystal panel,
The liquid crystal panel and the light control sheet material are bonded together with a transparent adhesive.
The sheets of light control sheet material are bonded together with a transparent adhesive,
The sheet laminated on the liquid crystal panel side among the plurality of sheets is a lens sheet in which an uneven portion is formed on the surface to be superimposed on the liquid crystal panel,
2. A liquid crystal display device, wherein the convex portion of the lens sheet is fixed to the liquid crystal panel with a transparent adhesive. The liquid crystal display device according to claim 1, wherein the transparent adhesive is in a sheet form. The liquid crystal display device according to claim 2 , wherein the transparent adhesive has line-shaped irregularities formed on a sheet-like adhesive surface. The liquid crystal display device according to claim 2 , wherein the transparent adhesive has lattice-like irregularities formed on a sheet-like adhesive surface. A light guide plate is superimposed on the light control sheet material,
The liquid crystal display device according to any one of claims 1 to 4 , wherein the light control sheet material and the light guide plate are bonded together with a transparent adhesive. Dimming so as to face the surface opposite to the surface where the liquid crystal panel is superposed sheet material, the liquid crystal display device of the lamp according to any one of claims 1 to 4 is disposed.

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