JP2004287408A - Liquid crystal display panel, liquid crystal display device, and method for manufacturing liquid crystal display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure that a display operation is reliably performed without degrading display performance by preventing peeling of a polarizing plate and patterned retardation plate arranged at a panel for display of a liquid crystal display device equipped with the liquid crystal display panel formed by laminating a liquid crystal panel for display and a parallax barrier in order to achieve the display in a first state of displaying different images for a plurality of visual points and a second display state of displaying a single image in the entire screen region. <P>SOLUTION: A liquid crystal panel 10 for display has a polarizing plate 15 on the side to be laminated with the patterned retardation plate 20, and the surface of the polarizing plate 15 is coated with an acrylic resin film 16. The lamination of the liquid crystal panel 10 for display and the patterned retardation plate 20 is performed by using an adhesive composed of a UV curing acrylic resin. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention makes it possible to display different images for a plurality of viewpoints, for example, as in a 3D liquid crystal display panel, and to provide a liquid crystal display panel and a liquid crystal display in which a display liquid crystal panel and a parallax barrier are attached to each other. It concerns the device.

  In a normal field of view, the human eye perceives images viewed from two different viewpoints because the two eyes are spatially separated from each other on the head, and the human brain recognizes these two eyes. The stereoscopic effect is recognized by the parallax of the image. Using this principle, a liquid crystal display device has been developed in which images viewed from different viewpoints are provided to the left and right eyes of an observer to give parallax and to perform 3D (stereoscopic three-dimensional) display.

  In a liquid crystal display device that performs 3D display, in order to supply images having different viewpoints to the left and right eyes of an observer, an image for the left eye and an image for the right eye on the display screen are displayed in, for example, color, polarization state, or Some are encoded by time of day and separated by a spectacle-like filter system worn by the observer to provide only the image corresponding to each eye.

  Further, as shown in FIG. 7A, a display panel 101 of a liquid crystal display device is combined with a parallax barrier 101 in which a light transmission region and a light blocking region are formed in a stripe shape, and a viewer uses a visual system such as a filter system. There is also a liquid crystal display device in which a 3D image can be recognized (automatic three-dimensional display) without using a visual aid. In other words, a specific viewing angle is given to the right-eye image and the left-eye image generated by the display panel 101 by the parallax barrier 102, and if the image is from a specific observation region in space, the image corresponds to each eye. Only the image is visually recognized, and the observer recognizes the 3D image (see FIG. 7B).

  As described above, an apparatus for performing an autostereoscopic display by providing a parallax barrier in a liquid crystal display device is disclosed in Patent Literature 1, for example. Note that Patent Document 1 discloses a configuration using a patterned retardation plate as a parallax barrier.

  In the liquid crystal display device having the parallax barrier as described above, a means for switching the effect of the parallax barrier on / off is provided by a switching liquid crystal layer or the like, so that 3D display and 2D display (flat display) are electrically performed. For example, a device capable of switching to is disclosed in Patent Document 2. That is, in the device of Patent Literature 2, 3D display is performed when the effect of the parallax barrier is enabled by ON / OFF of the switching liquid crystal layer, and 2D display is performed when the effect of the parallax barrier is disabled.

In such a 2D / 3D switching type liquid crystal display device, a display panel with a polarizing plate and a patterned retardation plate are bonded with a UV-curable acrylic resin, and a switching liquid crystal panel is further bonded thereto. A 2D / 3D switchable liquid crystal display panel is created.
JP-A-10-229567 (publication date: August 25, 1998) JP-A-10-123461 (publication date May 15, 1998)

  However, the following problems occur in the method of manufacturing the conventional 2D / 3D switching type liquid crystal display device.

  That is, when bonding the display panel with a polarizing plate and the patterned retardation plate, the polarizing plate surface and the patterned retardation plate in the display panel with a polarizing plate are bonded together. Peeling gradually occurs at the interface between the resin and the UV-curable acrylic resin.

  The above-described peeling at the interface between the polarizing plate and the UV-curable acrylic resin causes interference fringes due to a gap generated by the peeling during 2D display, which is a factor of deteriorating image quality. In 3D display, when the display panel with a polarizing plate is separated from the patterned retardation plate due to the peeling, the optimal viewing distance of the 3D display at the peeled portion becomes longer, and a display such as a uniform 3D display becomes impossible. Performance may be degraded.

  Further, since there is a possibility that the peeling may progress with the passage of time, the display panel and the patterned retardation plate may be completely peeled off, and the 2D / 3D switching type liquid crystal display panel may be damaged.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a first display for displaying different images from a plurality of viewpoints, such as a 2D / 3D switching type liquid crystal display device. A liquid crystal display device having a liquid crystal display panel in which a display liquid crystal panel and a parallax barrier are bonded to enable display in a state and a second display state in which one image is displayed in the entire screen area In an environment condition in which operation is guaranteed, a liquid crystal display device capable of preventing peeling between a polarizing plate and a patterned retardation plate arranged on a display panel and performing a display operation without deteriorating display performance is provided. To provide.

  In order to solve the above problems, a liquid crystal display panel of the present invention includes a display liquid crystal panel that generates a display image in accordance with input image data, a first display area and a second display in the display image. In a liquid crystal display panel having a parallax barrier that gives a specific viewing angle different from each other in a region, the display liquid crystal panel has a polarizing plate on the side to be bonded to the parallax barrier, and the parallax barrier has the polarization Provided as a patterned retardation plate having an effect of giving different specific viewing angles to the first display area and the second display area in a display image by an optical action with the plate. The surface is coated with an organic film, and the display liquid crystal panel and the patterned retardation plate are bonded together via an adhesive made of the same resin as the organic film. It is characterized in.

  According to another embodiment of the present invention, there is provided a liquid crystal display panel for generating a display image in accordance with input image data, a first display area in the display image. It has a parallax barrier that gives a different specific viewing angle to the second display area, and a switching liquid crystal panel that switches between the first display state and the second display state by switching the effect of the parallax barrier on / off. In the liquid crystal display panel, the display liquid crystal panel has a polarizing plate on a side where the display liquid crystal panel is bonded to the parallax barrier, and the parallax barrier is formed in a first display area in a display image by an optical action with the polarizing plate. And a second display area as a patterned retardation plate having an effect of giving different specific viewing angles to each other, and the surface of the polarizing plate is made of an organic film. Subversive is, the display liquid crystal panel and the patterned retarder is characterized in that the are bonded together via an adhesive comprising an organic film and the same system resin.

  According to the above configuration, an organic film is coated on the surface of the polarizing plate on the side where the patterned liquid crystal panel is attached to the patterned liquid crystal panel and the patterned retardation plate at the bonding portion. . For this reason, when bonding the polarizing plate and the patterned retardation plate with an adhesive made of the same resin as the organic film, the same material is bonded at the interface between the polarizing plate surface and the adhesive. Peeling at the interface can be prevented from occurring.

  For this reason, it is possible to provide a liquid crystal display panel capable of avoiding a decrease in display performance due to peeling at the interface between the polarizing plate surface and the adhesive and performing a reliable display operation.

  In the liquid crystal display panel of the present invention, it is preferable that the adhesive for bonding the display liquid crystal panel and the patterned retardation plate is a UV-curable acrylic resin.

  According to the above configuration, when the display liquid crystal panel and the patterned retardation film are bonded to each other by using a UV-curable acrylic resin, the display liquid crystal panel and the patterned retardation film can be precisely bonded. It can be aligned and fixed on the whole surface. That is, after the alignment of the display liquid crystal panel and the patterned retardation plate is completed, the display liquid crystal panel and the patterned retardation plate are firmly adhered by UV irradiation to cure the UV curable acrylic resin. At the same time, it can be fixed on the entire surface to maintain the adhesive strength.

  As described above, the liquid crystal display panel of the present invention, as described above, the display liquid crystal panel has a polarizing plate on the side to be bonded to the parallax barrier, and the parallax barrier, by the optical action with the polarizing plate, The first display region and the second display region in the display image are provided as a patterned retardation plate having an effect of giving a different specific viewing angle to each other, and the surface of the polarizing plate is coated with an organic film. The display liquid crystal panel and the patterned retardation plate are bonded to each other via an adhesive made of the same resin as the organic film.

  Therefore, when the polarizing plate and the patterned retardation plate provided on the display liquid crystal panel are bonded with an adhesive made of the same resin as the organic film covering the surface of the polarizing plate, the polarizing plate is bonded to the surface. Since materials of the same quality are bonded at the interface with the agent, it is possible to prevent the peeling at the interface from occurring.

  Accordingly, it is possible to provide a liquid crystal display panel that can reliably perform a display operation while avoiding a decrease in display performance due to peeling at an interface between the polarizing plate surface and the adhesive.

  An embodiment of the present invention will be described below with reference to FIGS.

  A schematic configuration of the liquid crystal display panel according to the present embodiment will be described with reference to FIG. In the following description, a case where the present invention is applied to a 2D / 3D switching type liquid crystal display panel will be exemplified. That is, in the 2D / 3D switching type liquid crystal display panel, 3D display is performed in the first display state in which the effect of the parallax barrier is enabled, and 2D display is performed in the second display state in which the effect of the parallax barrier is disabled. It can be carried out.

  As shown in FIG. 1, the 2D / 3D switching type liquid crystal display panel has a configuration in which a display liquid crystal panel 10, a patterned retardation plate 20, and a switching liquid crystal panel 30 are bonded. A 2D / 3D switchable liquid crystal display device is provided by mounting a drive circuit, a backlight (light source), and the like on the 2D / 3D switchable liquid crystal display panel according to the present embodiment.

  The display liquid crystal panel 10 is provided as a TFT liquid crystal display panel, and includes a first polarizing plate 11, a counter substrate 12, a liquid crystal layer 13, an active matrix substrate 14, and a second polarizing plate 15, which are laminated. Image data corresponding to an image to be displayed is input to the active matrix substrate 14 via a wiring 51 such as an FPC (Flexible Printed Circuits). The second polarizing plate 15 has an acrylic resin film 16 as an organic film on the surface thereof.

  The display liquid crystal panel 10 is provided as a display image generating means for generating a display screen according to image data, with respect to the 2D / 3D switching type liquid crystal display panel. Note that the display method (TN method or STN method) and the drive method (active matrix drive or passive matrix drive) in the display liquid crystal panel 10 are not particularly limited as long as they have a function of generating a display screen. .

  The patterned retardation plate 20 functions as a part of a parallax barrier. As shown in FIG. 2A, an alignment film 22 is formed on a transparent substrate 21, and a liquid crystal layer 23 is further formed thereon. This is a configuration formed by laminating. Further, in the active area of the patterned retardation plate 20, as shown in FIG. 2B, a first region 20A (indicated by a hatched portion in the figure) and a second region 20A having different polarization states, respectively. Regions 20B (indicated by projecting portions in the drawing) are alternately formed in a stripe shape. Further, in the patterned retardation plate 20, an alignment mark 20C formed in the same step as the first region 20A is provided.

  The switching liquid crystal panel 30 includes a drive-side substrate 31, a liquid crystal layer 32, a counter substrate 33, and a third polarizing plate 34, which are stacked to apply a drive voltage to the drive-side substrate 31 when the liquid crystal layer 32 is turned on. Are connected.

  The switching liquid crystal panel 30 is arranged as switching means for switching the polarization state of light passing through the switching liquid crystal panel 30 according to ON / OFF of the liquid crystal layer 32. That is, the switching liquid crystal panel 30 makes an optical modulation effect on light transmitted through the switching liquid crystal panel 30 different between 2D display and 3D display. The switching liquid crystal panel 30 does not need to be driven in a matrix like the display liquid crystal panel 10, and the driving electrodes provided on the driving substrate 31 and the counter substrate 33 are formed over the entire active area of the switching liquid crystal panel 30. Just fine.

  Next, a display operation of the 2D / 3D switching type liquid crystal display panel having the above configuration will be described.

  First, in the 2D / 3D switching type liquid crystal display panel shown in FIG. 1, the direction of the optical axis of each component is illustrated in FIG. Note that the optical axis shown in FIG. 3 is the direction of the slow axis in the alignment film (ie, the rubbing direction with respect to the alignment film) in the liquid crystal panel and the retardation plate, and the direction of the transmission axis in the polarizing plate.

  In the configuration of FIG. 3, the incident light emitted from the light source is first polarized by the third polarizing plate 34 of the switching liquid crystal panel 30. The switching liquid crystal panel 30 functions as a half-wave plate in the OFF state during 3D display.

  The light that has passed through the switching liquid crystal panel 30 is then incident on the patterned retardation plate 20. Since the rubbing direction, that is, the direction of the slow axis is different between the first region 20A and the second region 20B of the patterned retardation plate 20, the light passing through the first region 20A and the second region 20B The polarization state of the light passing through is different. In the example of FIG. 3, the polarization axes of the light passing through the first region 20A and the light passing through the second region 20B are different by 90 °. The patterned retardation plate 20 is set to function as a half-wave plate by the birefringence anisotropy and the film thickness of the liquid crystal layer 23.

  The light that has passed through the patterned retardation plate 20 is incident on the second polarizing plate 15 of the display liquid crystal panel 10. At the time of 3D display, the polarization axis of light that has passed through the first region 20A of the patterned retardation plate 20 is parallel to the transmission axis of the second polarizing plate 15, and the light that has passed through the first region 20A is a polarizing plate. 15 through. On the other hand, the polarization axis of the light passing through the second region 20B forms an angle of 90 ° with the transmission axis of the second polarizing plate 15, and the light passing through the second region 20B does not pass through the polarizing plate 15.

  That is, in the configuration of FIG. 3, the function of the parallax barrier is achieved by the optical action of the patterned retarder 20 and the second polarizer 15, and the first region 20 </ b> A of the patterned retarder 20 is The transmission region and the second region 20B are the blocking regions.

  The light that has passed through the second polarizing plate 15 is subjected to different optical modulation in the liquid crystal layer 13 of the display liquid crystal panel 10 between a pixel performing black display and a pixel performing white display, and the optical modulation is performed by the pixel performing white display. Image display is performed by transmitting only the received light through the first polarizing plate 11.

  At this time, the light passing through the transmission region of the parallax barrier or the light given a specific viewing angle passes through the pixels corresponding to the right-eye image and the left-eye image on the display liquid crystal panel 10 so that the right-eye image is displayed. The image for use and the image for left eye are separated into different viewing angles, and 3D display is performed.

  When 2D display is performed, the switching liquid crystal panel 30 is turned on, and no optical modulation is given to light passing through the switching liquid crystal panel 30. The light that has passed through the switching liquid crystal panel 30 then passes through the patterned retardation plate 20 so that different polarization states are given to the light that has passed through the first region 20A and the light that has passed through the second region 20B. Can be

  However, in the case of 2D display, unlike in the case of 3D display, since there is no optical modulation effect in the switching liquid crystal panel 30, the polarization axis of the light passing through the patterned retardation plate 20 is changed to the second polarization plate 15. Will be shifted symmetrically with respect to the transmission axis. Therefore, both the light that has passed through the first region 20A and the light that has passed through the second region 20B of the patterned retardation plate 20 pass through the second polarizing plate 15 at the same transmittance, and The function of the parallax barrier by the optical action related to the second polarizer 20 and 20 is not achieved (no specific viewing angle is given), and 2D display is performed.

  Here, a manufacturing process of the patterned retardation plate 20 will be described with reference to FIGS.

  In the manufacturing process of the patterned retardation plate 20, as shown in FIG. 4, first, the elementary glass serving as the substrate (substrate material) 21 is washed, and a polyimide is applied to one side of the washed substrate and fired. This forms the alignment film 22 (S11 to S13). Next, a first rubbing process (first rubbing) is performed on the alignment film 22 (S14). The rubbing direction in the first rubbing is the rubbing direction of the second region 20B. FIG. 5A shows a state in which the processes of S11 to S14 are completed.

  After the first rubbing, a resist is applied on the cleaned alignment film 22 of the substrate and calcined to form a resist layer 41 (S15 to S16). FIG. 5B shows a state in which the processing of S15 to S16 is completed.

  After the formation of the resist layer 41, the resist layer 41 is patterned by steps of exposure, development, and drying (S17 to S18). The patterned resist layer 41 forms a mask portion 41a that masks a portion to be the second region 20B of the patterned retardation plate 20. In addition, since the first region 20A of the patterned retardation plate 20 and the portion serving as the alignment mark 20C are not covered with the mask, the alignment film 22 is exposed. FIG. 5C shows a state in which the processing of S17 to S18 is completed.

  A second rubbing process (second rubbing) is performed on the substrate on which the resist layer 41 has been patterned in this manner from the resist layer 41 side (S19). The rubbing direction in the second rubbing is the rubbing direction of the first region 20A. At this time, in the region of the second region 20B where the alignment film 22 is covered with the mask portion 41a, the direction of the slow axis formed by the first rubbing is maintained, but is exposed without being covered with the mask portion 41a. The direction of the slow axis along the rubbing direction of the second rubbing is in the region of the first region 20A and the alignment mark 20C. FIG. 5D shows a state in which the process of S19 is completed.

  After the second rubbing, the resist remaining on the cleaned alignment film 22 of the substrate is again exposed and developed to remove the mask portion 41a, and then dried (S20 to S22). FIG. 5E shows a state in which the processes of S20 to S22 are completed.

  On the substrate from which the mask portion 41a has been removed, a UV-curable liquid crystal solution is applied on the alignment film 22 by a spin coating method or the like, and the UV-curable liquid crystal solution is further irradiated with UV to form liquid crystal molecules. Are crosslinked and polymerized (S23-S24). Thus, the liquid crystal layer 23 is formed. FIG. 5F shows a state in which the process of S24 has been completed.

  The processes of S11 to S24 are performed so that a plurality of patterned retardation plates 20 are collectively formed on one large substrate. Therefore, the substrate on which the plurality of patterned retarders 20 are formed is divided into individual patterned retarders 20 and inspected, thereby completing the patterned retarders 20 (S25 to S27).

  Next, an assembling process of the 2D / 3D switching type liquid crystal display panel according to the present embodiment will be described with reference to FIG.

  The 2D / 3D switching type liquid crystal display panel according to the present embodiment is completed by bonding separately manufactured display liquid crystal panel 10, patterned retardation plate 20, and switching liquid crystal panel 30.

  In the assembling process of the 2D / 3D switching type liquid crystal display panel, first, the patterned retardation plate 20 is attached to the display liquid crystal panel 10 with an adhesive (S1). Specifically, the UV curable acrylic resin is applied to the display liquid crystal panel 10 or the patterned retardation plate 20 so that air bubbles do not enter the UV curable acrylic resin. Avoid air bubbles inside. Then, the display liquid crystal panel 10 and the patterned retardation plate 20 are aligned with high precision, and after the alignment is completed, an appropriate amount of UV light having a desired wavelength is irradiated to cure the UV-curable acrylic resin. The panel 10 and the patterned retardation plate 20 are fixed.

  At this time, the display liquid crystal panel 10 is bonded to the patterned retardation plate 20 on the surface on which the second polarizing plate 15 is disposed. The second polarizing plate 15 is bonded to the patterned retardation plate 20 on the side on which the acrylic resin film 16 is coated. The acrylic resin used for the acrylic resin film 16 may be, for example, urethane acrylate (acrylic resin) coated on a polarizing plate manufactured by Nitto Denko Corporation for the purpose of protecting the surface (hard coat film). . The polarizing plate is usually manufactured by roll-to-roll including formation of a hard coat film. However, after the manufacturing of the second polarizing plate 15 is completed, the second polarizing plate 15 alone or a liquid crystal for display is manufactured. The acrylic resin film 16 can be formed by applying and curing an acrylic resin by a roll coater method or the like in a state where the acrylic resin film 16 is adhered to the panel 10.

  In addition, as an adhesive used for the bonding, a UV-curable acrylic resin is used. Thereby, the acrylic resin film 16 covering the surface of the second polarizing plate 15 of the display liquid crystal panel 10 and the adhesive used for bonding the display liquid crystal panel 10 and the patterned retardation plate 20 are formed. Becomes a similar material, the adhesion at this interface is increased, and peeling hardly occurs.

  Here, since the second polarizing plate 15 itself is a laminated plate of a film, the second polarizing plate 15 follows expansion and contraction due to heat or the like to some extent. Furthermore, in the present embodiment, the acrylic resin film 16 coated on the surface of the second polarizing plate 15 has a thickness of 10 μm or less, is considerably thinner than the polarizing plate thickness, and is coated on the polarizing plate surface. There is no problem such as peeling. The material and thickness of the adhesive layer forming the second polarizing plate 15 are optimized in order to promote the ability to follow expansion and contraction due to heat.

  In addition, when the second polarizing plate 15 whose surface is covered with the acrylic resin film 16 and the patterned retardation plate (formed on the glass substrate) 20 are bonded together with an adhesive, heat is generated. It is considered that the influence of the expansion and contraction of the second polarizing plate 15 itself is alleviated to some extent, and it is considered that peeling does not occur at these interfaces. Note that the thickness of the adhesive for bonding the second polarizing plate 15 and the patterned retardation plate 20 is preferably several tens of μm.

  In addition, the liquid crystal layer 23 formed on the surface of the patterned retardation plate 20 is formed of an acrylic resin (for example, Merck (Merck)) that cross-links and polymerizes liquid crystal molecules by UV irradiation of a UV-curable liquid crystal solution. RM (trade name: Reactive Mesogen), etc.). Therefore, also in the relationship between the adhesive used for the above-mentioned bonding and the liquid crystal layer 23, the acrylic resin of the same material is bonded to each other, and the adhesion at the interface between the adhesive and the liquid crystal layer 23 is also strong. Hard to occur.

  In addition, by using a UV-curable acrylic resin in the bonding, the display liquid crystal panel 10 and the patterned retardation plate 20 can be aligned with high precision at the time of bonding and fixed on the entire surface. . That is, after the alignment of the display liquid crystal panel 10 and the patterned retardation plate 20 is completed, UV irradiation is performed to cure the UV-curable acrylic resin, so that the display liquid crystal panel 10 and the patterned retardation plate 20 Can be firmly bonded and, at the same time, can be fixed on the entire surface to maintain the adhesive strength.

  Furthermore, the adhesive used in the above-mentioned bonding is colorless and transparent, and from this point of view, the use of a UV-curable acrylic resin is suitable. For example, as this UV-curable acrylic resin, Photorec (trade name) manufactured by Sekisui Chemical Co., Ltd. or the like can be used.

  In the present invention, the adhesive used for bonding the display liquid crystal panel 10 and the patterned retardation plate 20 is not limited to a UV-curable acrylic resin. However, if bonding is performed with an adhesive other than UV-curable acrylic resin (an adhesive that cures over time), the adhesive will harden during alignment and alignment will not be possible. There is a problem that it takes time to cure the adhesive (that is, fix the display liquid crystal panel 10 and the patterned retardation plate 20), thereby lowering productivity. In addition, lamination using a double-sided tape or the like has problems such that high-precision alignment cannot be performed, and there is a possibility of peeling under high-humidity storage conditions.

  When the display liquid crystal panel 10 and the patterned retarder 20 are bonded together, the display liquid crystal panel with the patterned retarder and the switching liquid crystal panel 30 are further bonded with an adhesive (S2), 2D / 3D. The switchable liquid crystal display panel is completed (S3).

  In bonding the display liquid crystal panel with the patterned retardation plate and the switching liquid crystal panel 30, particularly high-precision alignment is not required. Therefore, it is not necessary to use a UV-curable acrylic resin for bonding the switching liquid crystal panel 30, and there is no problem as long as the bonding is performed in a region other than the display area even if it is not transparent.

  Further, the adhesive used for bonding the switching liquid crystal panel 30 does not need to be a UV-curable acrylic resin, but may be an epoxy-based adhesive, an instant-curable adhesive (isocyanate-based adhesive), or a double-sided tape. Adhesion may be performed. However, in the case of laminating the entire panel, a colorless and transparent adhesive needs to be used.

  As described above, the 2D / 3D switching type liquid crystal display panel according to the present embodiment covers the surface of the second polarizing plate 15 of the display liquid crystal panel 10 with the acrylic resin film 16 and also has the display liquid crystal panel. An adhesive made of a UV-curable acrylic resin is used for bonding the 10 and the patterned retardation plate 20. Thereby, it is possible to prevent the peeling off at the interface between the second polarizing plate 15 and the adhesive in the display liquid crystal panel 10.

  Here, in order to verify the effect of preventing peeling of the 2D / 3D switching type liquid crystal display panel according to the present embodiment, the polarizing plate and the glass were compared with and without the acrylic resin film coated on the polarizing plate surface. Then, the adhesive strength when the UV-curable acrylic resin was bonded to the sample was compared and measured. The results are shown in Table 1 below.

  In Table 1, the configuration of the evaluation cell used in the evaluation was glass / polarizing plate / UV-curable acrylic resin / glass. For the adhesion, the peel strength was measured, and the value was taken as the value.

As can be seen from Table 1, when the surface of the polarizing plate is not coated with the acrylic resin, the adhesion is 1.73 × 10 ⁵ N / m ² or less, whereas the coating of the polarizing plate with the acrylic resin is not applied. In some cases, the adhesion is 1.96 × 10 ⁵ N / m ² or more. From this, it can be seen that the coating of the acrylic resin on the surface of the polarizing plate is effective in improving the adhesion, that is, preventing peeling. When the surface of the polarizing plate is covered with an acrylic resin, the area where the peeling occurred was the interface between the polarizing plate and the glass to which it was attached (the adhesive layer of the polarizing plate). It can be seen that the adhesion at the interface with the UV-curable acrylic resin is a value equal to or higher than the measured adhesion.

  Further, in the 2D / 3D switching type liquid crystal display panel according to the present embodiment, in order to verify the effect of preventing the occurrence of peeling in a high temperature environment, the polarizing plate surface is coated with an acrylic resin film and not coated. In each case, the number of peelings caused by the heat treatment was examined. The results are shown in Table 2 below.

  In Table 2, the configuration of the evaluation cell used in the evaluation was liquid crystal panel for display / polarizing plate / UV curable acrylic resin / patterned retardation plate. Peeling at the interface with the resin was confirmed.

  As can be seen from Table 2, when the surface of the polarizing plate is coated with an acrylic resin, the polarizing plate and the UV-curable acrylic were used under both the conditions of heating at 75 ° C. for 2 hours and heating at 85 ° C. for 2 hours. The number of occurrences of peeling at the interface with the system resin was 0, and it was confirmed that there was an effect of preventing the occurrence of peeling in a high-temperature environment as compared with the case where the surface of the polarizing plate was not coated with an acrylic resin. .

  As described above, the 2D / 3D switching type liquid crystal display panel according to the present embodiment has an acrylic liquid crystal panel on the surface of the second polarizing plate 15 on the bonding side of the display liquid crystal panel 10 with the patterned retardation plate 20. The resin film 16 is covered. Therefore, when the second polarizing plate 15 and the patterned retardation plate 20 are bonded together with an adhesive made of a UV-curable acrylic resin, peeling occurs at the interface between the polarizing plate surface and the adhesive. There is no.

  Thereby, at the time of 2D display, a problem that interference fringes are visible due to a gap generated by peeling of the interface between the polarizing plate surface and the adhesive can be avoided, and the image quality does not deteriorate. Further, at the time of 3D display, a problem that the display liquid crystal panel 10 and the patterned retardation plate 20 are separated due to the peeling, and the optimal viewing distance of the peeled portion in the 3D display becomes long can be avoided. Therefore, there is no reduction in display performance such that uniform 3D display cannot be performed.

  Furthermore, there is also a problem that the peeling at the interface between the polarizing plate and the adhesive proceeds, the display liquid crystal panel 10 and the patterned retardation plate 20 are completely peeled, and the 2D / 3D switching type liquid crystal display panel is damaged. Can be resolved.

  Therefore, it is possible to provide a 2D / 3D switching type liquid crystal display device capable of performing display operation reliably without deteriorating display performance under environmental conditions where operation is guaranteed.

  In the above description, the case where the present invention is applied to a 2D / 3D switching type liquid crystal display panel is illustrated. However, since the present invention has a feature in a portion where the display liquid crystal panel 10 and the patterned retardation plate 20 as a parallax barrier are bonded, a configuration not including the switching liquid crystal panel 30 (a configuration dedicated to 3D display) The present invention is also applicable to the 3D-type liquid crystal display panel and the 3D-type liquid crystal display device of the above).

  When the present invention is applied to a 3D-type liquid crystal display panel that does not include a switching liquid crystal panel, a half-wave plate is provided instead of the switching liquid crystal panel, and its slow axis is aligned with the rubbing direction of the switching liquid crystal panel. In addition, the third polarizing plate 34 shown in FIG. 1 is a light source side of a half-wave plate provided in place of the switching liquid crystal panel (the patterning phase difference plate 20 is bonded to the display liquid crystal panel 10). On the opposite side of the surface).

  In the present embodiment, the organic film formed on the surface of the second polarizing plate 15 and the adhesive used for bonding the display liquid crystal panel 10 and the patterned retardation plate 20 are made of UV curable acrylic. Although it is important to use the same resin to prevent peeling at the adhesive interface, it is important to use a resin other than the UV-curable acrylic resin if the material is transparent and the curing time can be easily controlled. Materials can also be used.

  In the above description, the case where the present invention is applied to the 2D / 3D switching type liquid crystal display panel has been exemplified. However, in the liquid crystal display panel according to the present invention, the liquid crystal display panel is separated at different viewing angles in the first display state. The images are not only required to be related to each other like the right-eye image and the left-eye image, but the liquid crystal display panel according to the present invention is not limited to the 2D / 3D switching type liquid crystal display panel.

  For example, the liquid crystal display panel according to the present invention performs a screen display that displays different video sources in each of the first display area and the second display area separated by the parallax barrier unit in the first display state. In the display state of 2, the present invention can be applied to a liquid crystal display panel that performs a screen display for displaying the same video source in the entire screen area.

  An example of the use of such a liquid crystal display panel is a display device that displays an image of a car navigation system to a driver in a driver's seat of a car and an image of a television broadcast to a passenger in a passenger seat. Can be considered. When different images are displayed to a plurality of observers, the light transmitted through each pixel is shielded by a parallax barrier so that the plurality of observers at a predetermined distance can be separated as images to be observed. What is necessary is just to set the arrangement | positioning pattern of a part and a transmission part suitably.

  As described above, even in a liquid crystal display panel capable of displaying different images from a plurality of viewpoints, it is possible to arbitrarily combine switching liquid crystal panels. On the other hand, a display state in which different images are displayed and a display state in which one image is displayed in the entire screen area can be configured to be switchable.

1, showing an embodiment of the present invention, is a cross-sectional view illustrating a configuration example of a 2D / 3D switching type liquid crystal display panel. FIG. 2A is a cross-sectional view, and FIG. 2B is a plan view, showing a configuration of a patterned retardation plate used in the 2D / 3D switching type liquid crystal display panel. It is a figure which shows the direction of the optical axis of each component in the said 2D / 3D switching type liquid crystal display panel. It is a flowchart which shows the manufacturing process of the said patterned retardation plate. FIG. 5A to FIG. 5F are cross-sectional views illustrating the steps of manufacturing the patterned retardation plate. It is a flowchart which shows the assembly process of the said 2D / 3D switching type liquid crystal display panel. FIGS. 7A and 7B show the principle of 3D display, in which FIG. 7A shows the effect of providing a viewing angle by a viewing barrier, and FIG. 7B shows an observation area of a 3D display screen.

Explanation of reference numerals

10 display liquid crystal panel 15 second polarizing plate (polarizing plate)
16 Acrylic resin film (organic film)
20 Patterned phase difference plate (parallax barrier)
30 Switching LCD panel

Claims (7)

A liquid crystal having a display liquid crystal panel that generates a display image in accordance with input image data, and a parallax barrier that provides different specific viewing angles to a first display area and a second display area in the display image On the display panel,
The display liquid crystal panel has a polarizing plate on the side where the display liquid crystal panel is bonded to the parallax barrier, and the parallax barrier has a first display area and a second display area in a display image by an optical action with the polarizing plate. It is provided as a patterned retardation plate to obtain the effect of giving a different specific viewing angle to each region,
The surface of the polarizing plate is coated with an organic film, and the display liquid crystal panel and the patterned retardation plate are bonded via an adhesive made of the same resin as the organic film. Liquid crystal display panel. A display liquid crystal panel that generates a display image in accordance with input image data, a parallax barrier that provides different specific viewing angles to a first display area and a second display area in the display image, and a parallax barrier A liquid crystal display panel having a switching liquid crystal panel that switches between a first display state and a second display state by switching between valid / invalid of the effect of
The display liquid crystal panel has a polarizing plate on the side where the display liquid crystal panel is bonded to the parallax barrier, and the parallax barrier has a first display area and a second display area in a display image by an optical action with the polarizing plate. It is provided as a patterned retardation plate to obtain the effect of giving a different specific viewing angle to each region,
The surface of the polarizing plate is coated with an organic film, and the display liquid crystal panel and the patterned retardation plate are bonded via an adhesive made of the same resin as the organic film. Liquid crystal display panel.   3. The liquid crystal display panel according to claim 1, wherein the adhesive for bonding the display liquid crystal panel and the patterned retardation plate is a UV-curable acrylic resin.   A liquid crystal display device comprising the liquid crystal display panel according to claim 1. A display liquid crystal panel that generates a display image in accordance with input image data and a parallax barrier that gives different specific viewing angles to the first display area and the second display area in the display image In the method for manufacturing a liquid crystal display panel comprising
The display liquid crystal panel has a polarizing plate on the side to be bonded to the parallax barrier, and the surface of the polarizing plate is covered with an organic film, and the parallax barrier is optically compatible with the polarizing plate. The first display area and the second display area in the display image are provided as a patterned retardation plate which obtains an effect of giving a different specific viewing angle by a function,
A method for manufacturing a liquid crystal display panel, comprising: bonding a display liquid crystal panel and a patterned retardation plate using an adhesive made of the same resin as the organic film. A display liquid crystal panel that generates a display image in accordance with input image data, a parallax barrier that provides different specific viewing angles to a first display area and a second display area in the display image, and a parallax barrier A method for manufacturing a liquid crystal display panel, comprising: bonding a switching liquid crystal panel that switches between a first display state and a second display state by switching on / off of the effect of
The display liquid crystal panel has a polarizing plate on the side to be bonded to the parallax barrier, and the surface of the polarizing plate is coated with an organic film, and the parallax barrier is optically compatible with the polarizing plate. The first display area and the second display area in the display image are provided as a patterned retardation plate which obtains an effect of giving a different specific viewing angle by a function,
A method for manufacturing a liquid crystal display panel, comprising: bonding a display liquid crystal panel and a patterned retardation plate with an adhesive made of the same resin as the organic film. A UV-curable acrylic resin is used as an adhesive for bonding the display liquid crystal panel and the patterned retardation plate,
The bonding of the display liquid crystal panel and the patterned retarder
A step of applying a UV curable acrylic resin to a display liquid crystal panel or a patterned retardation plate,
After bonding the display liquid crystal panel and the patterned retardation plate with the UV curable acrylic resin applied surface interposed therebetween, an alignment step;
Irradiating UV light to the display liquid crystal panel and the patterned retardation plate after the alignment is completed to cure the UV curable acrylic resin, and fixing the display liquid crystal panel and the patterned retardation plate. 7. The method for manufacturing a liquid crystal display panel according to claim 5, wherein:

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