JP2011017970A - Display device - Google Patents

Abstract

Disclosed is a display device in which warpage of a panel caused by contraction of a polarizing plate can be significantly suppressed.
A display device in which a polarizing plate POL2 is fixed via an adhesive layer CHL formed on at least one surface of a display panel, wherein the adhesive layer CHL is a non-adhesive portion in a plan view. NC is formed to be scattered with respect to the adhesive portion CH.
[Selection] Figure 2

Description

  The present invention relates to a display device, and more particularly to a display device in which a polarizing plate is adhered to a display surface.

  For example, a liquid crystal display device (panel) includes a pair of substrates that are arranged to face each other with a liquid crystal sandwiched between them, and a large number of pixels arranged in a matrix form in the display area (display portion). It is configured to drive molecules.

  A polarizing plate is disposed on the surface of each of the pair of substrates opposite to the liquid crystal so as to cover the display region. The polarizing plate is configured by forming a protective film on each of the front and back surfaces of the polarizer, and is adhered to each of the pair of substrates via an adhesive layer formed over the entire area of one surface of the polarizing plate. It has a configuration.

  In addition, as a well-known document relevant to this invention, there exist the following patent documents 1 thru | or 3, for example.

  Patent Document 1 relates to a heat insulating panel composed of a face material and a heat insulating material, and directly bonds the face material and the heat insulating material without interposing a sheet-like member in a part between the face material and the heat insulating material. Is a statement that the face material and the heat insulating material are in a non-adhered state by interposing a sheet-like member, and a statement that the warp deformation caused by the difference in expansion between the face material and the heat insulating material is thereby suppressed. is there.

  Patent Document 2 relates to a composite decorative face material composed of a base material and a surface material, a description of a configuration in which an adhesive layer in which an adhesive material is applied in a turtle shell shape is formed on the surface of the base material, and the surface material is bonded. Thus, there is a description that at the time of high temperature, the surface material is deformed so as to swell at a portion other than the adhesion portion of the adhesive layer, thereby reducing the warpage of the composite decorative face material.

  Patent Document 3 relates to a reflective sheet composed of a plastic sheet having a metal thin film layer and a porous resin sheet, and an adhesion formed by forming the plastic sheet having the metal thin film layer and the porous resin sheet in a pattern such as dots, diagonal lines, and meshes. There is a description that the structure bonded with the material or the adhesive material and that the warpage is thereby suppressed.

JP 2000-355990 A Japanese Patent Laid-Open No. 9-239892 JP 2005-114777 A

  In the above-described liquid crystal display device, when it is in a high temperature atmosphere, the polarizing plate has a property of being thermally contracted in the direction of the stretching axis (absorption axis).

  In recent years, a pair of substrates constituting the envelope of the liquid crystal display panel tends to be thin, and the liquid crystal display panel tends to be thin as a whole.

  In this case, when the polarizing plate is thermally contracted, it is conducted to the liquid crystal display panel through an adhesive material that fixes the polarizing plate to each substrate of the liquid crystal display panel, and the liquid crystal display panel is warped.

  Here, when a material having a relatively high elastic modulus is used as the adhesive material, the warpage of the liquid crystal display panel tends to increase accordingly.

  An object of the present invention is to provide a display device in which warpage of a panel caused by contraction of a polarizing plate can be greatly suppressed.

  In the present invention, an adhesive portion and a non-adhesive portion are provided in the adhesive layer between the polarizing plate and the display panel.

  The configuration of the present invention can be as follows, for example.

(1) The display device of the present invention is a display device in which a polarizing plate is fixed to at least one surface of a display panel via an adhesive layer,
The adhesive layer is characterized in that the non-adhesive part is formed to be scattered with respect to the adhesive part in a plan view.

(2) In the display device of the present invention according to (1), the adhesive layer is arranged in parallel in a direction crossing the first direction, with the adhesive portion extending in the first direction when viewed in plan. The non-adhesive part is formed between the adhesive parts.

(3) The display device of the present invention is characterized in that, in (1), the width of the non-adhesive portion is set to 0.005 mm or more and 1.5 mm or less.

(4) In the display device of the present invention, in (1), the adhesive portion is formed in a frame-like continuous pattern on the outer periphery of the polarizing plate, and the width is set to 0.8 mm or more and 2.0 mm or less. It is characterized by.

(5) The display device of the present invention is characterized in that, in (2), the first direction is a direction of 90 ° ± 10 ° with respect to the stretching axis of the polarizing plate.

(6) The display device according to the present invention is characterized in that, in (1), the adhesive layer is formed by a plurality of dotted non-adhesive portions scattered in the adhesive portion as viewed in a plan view.

(7) The display device according to the present invention is characterized in that, in (6), the diameter of the non-adhesive portion is set to 0.005 mm or more and 1.5 mm or less.

(8) The display device of the present invention is characterized in that, in (6), the adhesive portion exists on the outer periphery of the polarizing plate, and the width of the adhesive portion is set to 0.8 mm or more and 2.0 mm or less. And

(9) In the display device of the present invention according to (1), the adhesive layer is formed in a region where the adhesive portions are formed in a lattice shape and the non-adhesive portion is surrounded by the adhesive portions in a plan view. It is characterized by.

(10) The display device according to the present invention is characterized in that, in (9), the maximum width of the non-adhesive portion is set to 0.005 mm or more and 1.5 mm or less.

(11) The display device of the present invention is characterized in that, in (9), the adhesive portion exists on the outer periphery of the polarizing plate, and the width of the adhesive portion is set to 0.8 mm or more and 2.0 mm or less. And

(12) In the display device of the present invention according to (1), in the adhesive layer, the adhesive layer has an adhesive portion formed in a pixel region of the display panel and is non-adhesive in a light shielding region between adjacent pixels. A portion is formed.

(13) In the display device according to the aspect of the invention, in (12), the light-shielding region between adjacent pixels has a lattice shape having an intersection, and the non-adhesive portion is formed at the intersection. Features.

(14) In the display device of the present invention, in any one of (1) to (13), a groove is formed on the one surface of the display panel, and the non-adhesive portion of the adhesive layer is formed at the portion where the groove is formed. It is characterized by becoming.

(15) In the display device according to any one of (1) to (14), the non-adhesive portion is formed of an air layer.

(16) The display device according to any one of (1) to (15) is characterized in that the display device is a liquid crystal display device.

(17) The display device according to any one of (1) to (15) is characterized in that the display device is an organic EL display device.

  The above-described configuration is merely an example, and the present invention can be modified as appropriate without departing from the technical idea. Further, examples of the configuration of the present invention other than the above-described configuration will be clarified from the entire description of the present specification or the drawings.

  According to such a display device, the warp of the panel caused by the contraction of the polarizing plate can be greatly suppressed.

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

It is the top view which looked at Example 1 of the display of the present invention from the observer side. It is sectional drawing in the IB-IB line | wire of FIG. It is a figure corresponding to FIG. 1, and is explanatory drawing which showed the extension direction of the adhesion part of an adhesion layer. It is the schematic sectional drawing which showed the display apparatus of this invention taking the liquid crystal display device (panel) as an example. It is the top view which looked at Example 2 of the display device of the present invention from the observer side. It is sectional drawing in the IIIB-IIIB line | wire of FIG. It is the top view which looked at Example 3 of the display device of the present invention from the observer side. It is sectional drawing in the IVB-IVB line | wire of FIG. It is explanatory drawing which shows Example 4 of the display apparatus of this invention, and is a top view which shows the pixel of a liquid crystal display panel. It is explanatory drawing which shows Example 4 of the display apparatus of this invention, and is the figure which matched the pixel shown in FIG. 9, and showed the adhesion part and non-adhesion part of an adhesion layer. It is explanatory drawing which shows Example 5 of the display apparatus of this invention, and is the figure which showed the pixel of the liquid crystal display panel, and the non-adhesion part of an adhesion layer. It is the top view which looked at Example 6 of the display apparatus of the present invention from the observer side. It is sectional drawing in the VIIB-VIIB line | wire of FIG.

  Embodiments of the present invention will be described with reference to the drawings. In each drawing and each example, the same or similar components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 4 is a schematic sectional view showing the liquid crystal display device (panel) as an example of the display device of the present invention. In FIG. 4, the liquid crystal display panel PNL is configured by using a pair of substrates SUB1 and SUB2 arranged opposite to each other with the liquid crystal LC interposed therebetween. A sealing material SL is formed around the substrates SUB1 and SUB2. The liquid crystal is sealed by the sealing material SL, and the substrates SUB1 and SUB2 are fixed. The area surrounded by the sealing material SL constitutes a display area (display portion) AR, and a large number of pixels (not shown) arranged in a matrix form with the liquid crystal LC as one constituent element are formed in the display area AR. Has been. An electronic circuit (not shown) is formed on the surface of the substrate SUB1 on the liquid crystal LC side, and this electronic circuit generates an electric field in the liquid crystal LC of the pixel in each pixel. A polarizing plate POL1 is disposed on the surface opposite to the liquid crystal LC of the substrate SUB1 via an adhesive layer described later, and a polarizing plate POL2 is disposed on the surface opposite to the liquid crystal LC of the substrate SUB2 via an adhesive layer described later. Has been. Each of the polarizing plates POL1 and POL2 is formed so as to cover the display area AR, and the driving of the molecules of the liquid crystal LC in each pixel by the electric field can be visualized.

  In FIG. 4, the substrate SUB2 side of the liquid crystal display panel PNL is a surface that the observer observes, and a backlight (not shown) is arranged on the back surface (surface on the substrate SUB1 side). ing.

  FIG. 1 is a plan view of the liquid crystal display panel PNL viewed from the viewer side, and FIG. 2 is a cross-sectional view taken along line IB-IB in FIG.

  As is clear from FIG. 2, the polarizing plate POL2 shown in FIG. 1 includes a polarizer PL and protective films PV1 and PV2 formed on the front and back surfaces of the polarizer PL. Normally, the polarizing plate is grasped in a state in which an adhesive material is applied to the surface on the protective film PV1 side before the liquid crystal display panel PNL is arranged, and further, a vinyl sheet is attached with the adhesive material covered. The When this polarizing plate is disposed on the liquid crystal display panel PNL, the vinyl sheet is peeled off, and the surface on which the adhesive material is formed is brought into contact with, for example, the substrate SUB2 of the liquid crystal display panel PNL, thereby applying pressure as shown in FIG. It is supposed to be in a state. However, for convenience of explanation, in this specification, the polarizing plate POL is described as being constituted by the polarizer PL and the protective films PV1 and PV2, and the adhesive material being independent of the polarizing plate POL.

  In FIG. 2, a polarizing plate POL2 is fixed to the substrate SUB2 by an adhesive layer CHL interposed between the liquid crystal display panel PNL and the substrate SUB2. Note that the pressure-sensitive adhesive layer or pressure-sensitive adhesive material in this specification is used in a concept distinguished from the adhesive layer or the adhesive material, and has a certain degree of elasticity even in a solidified state.

  The adhesive layer CHL has an adhesive part CH and a non-adhesive part NC between the polarizing plate POL2 and the substrate SUB2, and the adhesive part CH is an angle with respect to the y direction in the figure in this embodiment. The stripe-shaped adhesive portion CH is formed to be arranged in parallel in a direction orthogonal to the extending direction. For this reason, the non-adhesive part NC also has a stripe shape extending at a certain angle α with respect to the y direction in the figure, and there are many stripe-like adhesive parts in the direction orthogonal to the extension direction. It is formed side by side.

  In this case, the width L of the non-adhesive portion NC is set as small as possible from the viewpoint of visual observation of the image of the liquid crystal display panel PNL, and is, for example, 0.005 mm or more and 1.5 mm or less. However, it may be preferably 0.010 mm or more and 1.0 mm or less, and more preferably 0.015 mm or more and 0.15 mm or less. And the total area in the adhesion part CH is set to 300 mm <2> or less, for example. However, it may be preferably 25 mm 2 or more and 300 mm 2 or more. Further, the total area in the adhesive portion CH is set to be 10% or more and less than 90% with respect to the area of the polarizing plate POL2. However, desirably, it may be 20% or more and less than 80% with respect to the area of the polarizing plate POL2.

  Further, the adhesive portion CH is formed as a continuous frame-like pattern on the outer periphery of the polarizing plate POL2, and no non-adhesive portion is formed in this portion. This is because the adhesion of the polarizing plate POL2 to the substrate SUB2 is made reliable. The width L ′ of the adhesive portion (indicated by reference symbol CH ′ in the figure) made of a frame-like pattern is set to, for example, 0.8 mm or more and 2.0 mm or less. However, it may be desirably 0.5 mm or more and 1.0 mm or less.

  The extending direction of the adhesive portion CH and the non-adhesive portion NC (angle α with respect to the y direction in the figure) is not particularly limited, but is 90 ° (or 90 ° ± 10 with respect to the stretching axis of the polarizing plate POL2). It may be set in the direction of °). FIG. 3 is a view corresponding to FIG. 1 and shows the extending direction of the adhesive portion CH of the adhesive layer CHL and the direction of the stretching axis ST of the polarizing plate POL2. That is, since the absorption axis direction of the polarizing plate POL2 is a stretching axis, the rate of heat shrinkage is large. For this reason, if the non-adhesive portion NC is present at any location when cut in the absorption axis direction, the adhesive material can easily move, and the effect of the present invention can be increased. For this reason, it is desirable to set the extending direction of the adhesive portion CH so as to be substantially orthogonal to the stretching axis ST of the polarizing plate POL2. However, when an angle other than this is set, the area of the adhesive portion CH itself is small even when, for example, there is a portion where the non-adhesive portion NC does not exist when cut in the absorption axis direction. Therefore, a sufficient stress relaxation effect can be obtained. Therefore, the extending direction of the adhesive portion CH may be set in a direction coaxial with the stretching axis ST of the polarizing plate POL2 (within ± 10 °).

  The non-adhesive part NC is preferably an air layer. This is because the air layer can be easily deformed when compressed. However, a non-adhesive agent such as a resin having the same refractive index as that of the adhesive layer (adhesive agent having a lower adhesiveness than the adhesive portion) may be buried between the adhesive portions.

  Further, the extending direction of the adhesive portion CH may be made to coincide with the pixel arrangement direction (y direction or x direction in the figure). However, in this case, moire due to interference may occur. It is preferable to form it shifted by 2 ° or more with respect to the pixel arrangement direction.

  When configured in this way, the adhesive layer CHL is formed in the planar direction by the presence of the non-adhesive layer NC as compared with the case where the adhesive layer CHL is entirely formed between the liquid crystal display panel PNL and the polarizing plate POL2. There is an effect that it is easily deformed. For this reason, even when the polarizing plate POL2 is thermally contracted, the stress due to the thermal contraction is absorbed by the adhesive layer CHL and is not transmitted to the liquid crystal display panel PNL side. Therefore, warpage of the liquid crystal display panel PNL can be avoided by the adhesive layer CHL.

  As shown in FIG. 4, the liquid crystal display panel PNL is configured by adhering the polarizing plate POL1 also on the substrate SUB1 side. For this reason, the adhesive layer CHL in the adhesion between the polarizing plate POL1 and the substrate SUB1 has the same configuration. The same applies to Examples 2 to 6 below.

  5 and 6 are configuration diagrams showing Embodiment 2 of the display device of the present invention, FIG. 5 is a plan view of the liquid crystal display panel PNL viewed from the viewer side, and FIG. 6 is IIIB-IIIB in FIG. It is sectional drawing in a line. FIG. 5 corresponds to FIG. 1, and FIG. 6 corresponds to FIG.

  Also in Example 2, the adhesive layer CHL between the polarizing plate POL2 and the substrate SUB2 has an adhesive part CH and a non-adhesive part NC. The non-adhesive portions NC have a circular pattern, for example, when viewed in plan, and a large number of non-adhesive portions NC of this circular pattern are arranged in a matrix. The adhesion part CH is formed in the whole area | region except the non-adhesion part NC. The pattern of the non-adhesive portion NC is not necessarily circular, and may be another pattern such as a triangle. In short, it is only necessary that a large number of point-like non-adhesive portions NC are scattered.

  The diameter D of the non-adhesive portion NC is set as small as possible from the viewpoint of visual observation of the image of the liquid crystal display panel PNL, and is, for example, 0.005 mm or more and 1.5 mm or less. However, it may be preferably 0.010 mm or more and 1.0 mm or less, more preferably 0.015 mm or more and 0.15 mm or less. And the total area in the adhesion part CH is set to 300 mm <2> or less, for example. However, it may be preferably 25 mm 2 or more and 300 mm 2 or more. Further, the total area in the adhesive portion CH is set to be 10% or more and less than 90% with respect to the area of the polarizing plate POL2. However, desirably, it may be 20% or more and less than 80% with respect to the area of the polarizing plate POL2.

  In addition, the adhesive portion CH exists and the non-adhesive portion NC does not exist on the outer periphery of the polarizing plate POL2. This is because the adhesion of the polarizing plate POL2 to the substrate SUB2 is made reliable. The width L ′ of the adhesive portion (indicated by reference symbol CH ′ in the figure) on the outer periphery of the polarizing plate POL2 is set to, for example, 0.8 mm or more and 2.0 mm or less. However, it may be desirably 0.5 mm or more and 1.0 mm or less.

  The non-adhesive part NC is preferably an air layer. This is because the air layer can be easily deformed when compressed. However, a non-adhesive agent such as a resin having the same refractive index as that of the adhesive layer (adhesive agent having a lower adhesiveness than the adhesive portion) may be buried between the adhesive portions.

  Even in such a configuration, the adhesive layer CHL is flat when compared with the case where the adhesive layer CHL is entirely formed between the liquid crystal display panel PNL and the polarizing plate POL2, because the non-adhesive layer NC exists. There is an effect that it is easily deformed in the direction. For this reason, even when the polarizing plate POL2 is thermally contracted, the stress due to the thermal contraction is absorbed by the adhesive layer CHL and is not transmitted to the liquid crystal display panel PNL side. Therefore, warpage of the liquid crystal display panel PNL can be avoided by the adhesive layer CHL.

  FIGS. 7 and 8 are configuration diagrams showing Embodiment 3 of the display device of the present invention, FIG. 7 is a plan view of the liquid crystal display panel PNL viewed from the viewer side, and FIG. 8 is IVB-IVB of FIG. It is sectional drawing in a line. 7 corresponds to FIG. 1, and FIG. 8 corresponds to FIG. Also in Example 3, the adhesive layer CHL between the polarizing plate POL2 and the substrate SUB2 includes the adhesive part CH and the non-adhesive part NC. The adhesive portion CH is formed in a lattice pattern, and the non-adhesive portion NC is formed in a region surrounded by the adhesive portion CH. That is, the adhesive portion CH extends at a certain angle α with respect to the y direction in the drawing, and has a stripe shape arranged in parallel in the angle (α + 90 °) direction, and the angle with respect to the y direction in the drawing. It extends with (α + 90 °) and is composed of stripes arranged in parallel in the direction of the angle α. Thereby, the non-adhesive part NC is configured as a diamond-shaped region.

  In this case, the maximum width (diagonal dimension) W of the non-adhesive portion NC is set as small as possible from the viewpoint of visual observation of the image of the liquid crystal display panel PNL, for example, 0.005 mm or more and 1.5 mm or less. Yes. However, it may be preferably 0.010 mm or more and 1.0 mm or less, and more preferably 0.015 mm or more and 0.15 mm or less. And the total area in the adhesion part CH is set to 300 mm <2> or less, for example. However, it may be preferably 25 mm 2 or more and 300 mm 2 or more. Further, the total area in the adhesive portion CH is set to be 10% or more and less than 90% with respect to the area of the polarizing plate POL2. However, desirably, it may be 20% or more and less than 80% with respect to the area of the polarizing plate POL2.

  In addition, the adhesive portion CH exists and the non-adhesive portion NC does not exist on the outer periphery of the polarizing plate POL2. This is because the adhesion of the polarizing plate POL2 to the substrate SUB2 is made reliable. The width L ′ of the adhesive portion (indicated by reference symbol CH ′ in the figure) on the outer periphery of the polarizing plate POL2 is set to, for example, 0.8 mm or more and 2.0 mm or less. However, it may be preferably 0.5 mm or more and 1.0 mm or less, more preferably 0.5 mm or more and 1.0 mm or less.

  The non-adhesive part NC is preferably an air layer. This is because the air layer can be easily deformed when compressed. However, a non-adhesive agent such as a resin having the same refractive index as that of the adhesive layer (adhesive agent having a lower adhesiveness than the adhesive portion) may be buried between the adhesive portions.

  Even in such a configuration, the adhesive layer CHL is flat when compared with the case where the adhesive layer CHL is entirely formed between the liquid crystal display panel PNL and the polarizing plate POL2, because the non-adhesive layer NC exists. There is an effect that it is easily deformed in the direction. For this reason, even when the polarizing plate POL2 is thermally contracted, the stress due to the thermal contraction is absorbed by the adhesive layer CHL and is not transmitted to the liquid crystal display panel PNL side. Therefore, warpage of the liquid crystal display panel PNL can be avoided by the adhesive layer CHL.

  9 and 10 are explanatory views showing Embodiment 4 of the display device of the present invention. FIG. 9 shows three pixels for color display in the liquid crystal display panel PNL. A red (R) pixel, a green (G) pixel, and a blue (B) pixel PIX are juxtaposed, and these pixels PIX constitute a unit pixel for color display. Then, a light-blocking region IL is formed around the color display unit pixel (in FIG. 9, an example is shown on the right side and the lower side in the drawing) with another adjacent color display unit pixel. Yes. This is to improve the display contrast. Although not shown, the light shielding region IL is a place where a signal line for driving each pixel is arranged.

  On the other hand, FIG. 10 is a diagram corresponding to FIG. 9, and a portion where the adhesive layer CHL is formed on the surface of, for example, the substrate SUB2 of the liquid crystal display panel PNL is defined as a unit pixel for color display. It is the figure shown by the relationship. That is, the adhesion layer CHL is formed so as to have the adhesion portion CH in the pixel formation region and the non-adhesion portion NC in the light shielding region IL.

  In this case, the adhesive portion CH and the pixel region, the non-adhesive portion NC and the light-shielding region IL do not necessarily overlap in a 1: 1 correspondence, the adhesive portion CH is larger than the pixel region, and the non-adhesive portion NC is You may make it make small with respect to light-shielding area | region IL. In this case, it is preferable that the adhesive portion CH is overlapped in the range of 0 to 5 μm over the entire week of the pixel region.

  The non-adhesive part NC is preferably an air layer. This is because the air layer can be easily deformed when compressed. However, a non-adhesive agent such as a resin having the same refractive index as that of the adhesive layer (adhesive agent having a lower adhesiveness than the adhesive portion) may be buried between the adhesive portions.

  Even in such a configuration, the adhesive layer CHL is flat when compared with the case where the adhesive layer CHL is entirely formed between the liquid crystal display panel PNL and the polarizing plate POL2, because the non-adhesive layer NC exists. There is an effect that it is easily deformed in the direction. For this reason, even when the polarizing plate POL2 is thermally contracted, the stress due to the thermal contraction is absorbed by the adhesive layer CHL and is not transmitted to the liquid crystal display panel PNL side. Therefore, warpage of the liquid crystal display panel PNL can be avoided by the adhesive layer CHL.

  In view of the above-described embodiment, the non-adhesive portion NC in the adhesive layer CHL is formed in a pattern surrounding each of the plurality of pixels (light transmission portions) for color display of the liquid crystal display panel PNL when viewed in a plan view. You may make it do. For the same purpose, the non-adhesive portion NC may be formed so as to overlap with a black matrix (light-shielding film) formed in the display area of the liquid crystal display panel PNL in a plan view.

  FIG. 11 is an explanatory view showing Embodiment 5 of the display device of the present invention. FIG. 11 is a diagram in which a plurality of pixels PIX of the liquid crystal display panel PNL viewed in a plan view and portions where the non-adhesive portions NC of the adhesive layer CHL are formed are overlapped on the pixels PIX.

  The plurality of pixels PIX of the liquid crystal display panel PNL are each provided with a light shielding region IL between other adjacent pixels PIX. The light shielding region IL is provided to improve display contrast.

  In each pixel PIX, for example, a circular shape is formed on the light shielding region IL in the direction of θ (= 45 ± 10: with respect to the x direction in the drawing) from the center of the pixel PIX (indicated by a cross in the drawing). The non-adhesive part NC is formed. Thereby, the non-adhesive part NC is arranged so that the center (indicated by a cross in the figure) is positioned at the intersection of the light shielding regions IL formed in a lattice pattern. Since the intersecting portion of the light shielding region IL has a relatively wide area, there is an effect that the area of the non-adhesive portion NC can be increased.

  The non-adhesive part NC is preferably an air layer. This is because the air layer can be easily deformed when compressed. However, a non-adhesive agent such as a resin having the same refractive index as that of the adhesive layer (adhesive agent having a lower adhesiveness than the adhesive portion) may be buried between the adhesive portions.

  Even in such a configuration, the adhesive layer CHL is flat when compared with the case where the adhesive layer CHL is entirely formed between the liquid crystal display panel PNL and the polarizing plate POL2, because the non-adhesive layer NC exists. There is an effect that it is easily deformed in the direction. For this reason, even when the polarizing plate POL2 is thermally contracted, the stress due to the thermal contraction is absorbed by the adhesive layer CHL and is not transmitted to the liquid crystal display panel PNL side. Therefore, warpage of the liquid crystal display panel PNL can be avoided by the adhesive layer CHL.

  12 and 13 are explanatory views showing Example 6 of the display device of the present invention. 12 is a plan view of the liquid crystal display panel PNL viewed from the viewer side, and FIG. 13 is a cross-sectional view taken along the line VIIB-VIIB in FIG.

  In this embodiment, first, a large number of parallel grooves DNT are formed on the surface of the substrate SUB2 of the liquid crystal display panel PNL as shown in FIG. As shown in FIG. 12, the groove DNT has a stripe shape extending on the substrate SUB2 at a certain angle α with respect to the y direction in the figure. A large number are arranged in parallel in a direction orthogonal to the existing direction. The depth D of the groove DNT is 0.01 mm or more. However, it is preferably 0.02 mm or more and 0.1 mm or less. Such a trench DNT can be formed by, for example, a selective etching method using a photolithography technique.

  On the other hand, the polarizing plate POL2 has a configuration in which an adhesive material CHL is formed on the entire surface on the protective film PV1 side, and is fixed to the substrate SUB2 of the substrate SUB2 of the liquid crystal display panel PNL via the adhesive material CHL. ing. In this case, the adhesive CHL functions as a non-adhesive part NC at the location where the groove DNT is formed with respect to the substrate SUB2, and the same effect as shown in the first embodiment (FIGS. 1, 2 and 3). Can be played.

  From this, the same effects can be obtained by forming the groove DNT having a predetermined pattern on the substrate SUB2 of the liquid crystal display panel PNL also in the second to fifth embodiments.

  In each of the above-described embodiments, the liquid crystal display device has been described as an example of the display device. However, the present invention can be applied to other display devices such as an organic EL display device. An organic EL display device may adopt a configuration in which a circularly polarizing plate is adhered to a pixel formation surface of the panel by laminating a polarizing plate together with a retardation plate. In such a case, the present invention can be applied. Because it can.

  The present invention has been described using the embodiments. However, the configurations described in the embodiments so far are only examples, and the present invention can be appropriately changed without departing from the technical idea. Further, the configurations described in the respective embodiments may be used in combination as long as they do not contradict each other.

PNL: Liquid crystal display panel, AR: Display area (display unit), SUB1, SUB2 ... Substrate, SL ... Sealing material, LC ... Liquid crystal, POL1, POL2 ... Polarizer, PL ... Polarizer, PV1 , PV2 ... protective film, CHL ... adhesive layer, CH ... adhesive part, NC ... non-adhesive part.

Claims (17)

A display device in which a polarizing plate is fixed to at least one surface of a display panel via an adhesive layer,
The display device, wherein the adhesive layer is formed with a non-adhesive portion scattered with respect to the adhesive portion in a plan view.   The adhesive layer is formed so that the adhesive part extends in the first direction and is juxtaposed in a direction intersecting the first direction, and the non-adhesive part exists between the adhesive parts. The display device according to claim 1.   The display device according to claim 1, wherein a width of the non-adhesive portion is set to 0.005 mm or more and 1.5 mm or less.   2. The display device according to claim 1, wherein the adhesive portion is formed in a frame-like continuous pattern on the outer periphery of the polarizing plate, and the width thereof is set to 0.8 mm or more and 2.0 mm or less. .   The display device according to claim 2, wherein the first direction is a direction of 90 ° ± 10 ° with respect to a stretching axis of the polarizing plate.   The display device according to claim 1, wherein the adhesive layer is formed by a plurality of dotted non-adhesive portions scattered in the adhesive portion as viewed in a plan view.   The display device according to claim 6, wherein a diameter of the non-adhesive portion is set to 0.005 mm or more and 1.5 mm or less.   The display device according to claim 6, wherein the adhesive portion is present on an outer periphery of the polarizing plate, and a width of the adhesive portion is set to 0.8 mm or more and 2.0 mm or less.   2. The display device according to claim 1, wherein the adhesive layer is formed in a region in which an adhesive part is formed in a lattice shape and a non-adhesive part is surrounded by the adhesive part in a plan view. .   The display device according to claim 9, wherein the maximum width of the non-adhesive portion is set to 0.005 mm or more and 1.5 mm or less.   The display device according to claim 9, wherein the adhesive portion exists on an outer periphery of the polarizing plate, and a width of the adhesive portion is set to 0.8 mm or more and 2.0 mm or less.   2. The adhesive layer according to claim 1, wherein an adhesive portion is formed in a pixel region of the display panel and a non-adhesive portion is formed in a light-shielding region between adjacent pixels when viewed in plan. The display device described.   The display device according to claim 12, wherein a light shielding region between adjacent pixels has a lattice shape having an intersection, and the non-adhesive portion is formed at the intersection.   14. A display according to claim 1, wherein a groove is formed on the one surface of the display panel, and a non-adhesive portion of the adhesive layer is formed at a position where the groove is formed. apparatus.   The display device according to claim 1, wherein the non-adhesive portion is formed of an air layer.   The display device according to claim 1, wherein the display device is a liquid crystal display device.   The display device according to claim 1, wherein the display device is an organic EL display device.

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