JP2012155241A - Liquid crystal display device and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize a protrusion amount of a sealing material of a liquid crystal panel for a parallax barrier.SOLUTION: A liquid crystal 46 display device includes a liquid crystal panel 32 for a parallax barrier superposed on a liquid crystal display panel 10. The liquid crystal panel 32 for the parallax barrier includes: a lower substrate 36 disposed in the side of the liquid crystal display panel 10; an upper substrate 34 disposed in the opposite side of the liquid crystal panel 10; a seal 42 disposed between the upper substrate 34 and the lower substrate 36 and enclosing a space so as to have a cut 44; the liquid crystal 46 filling the space; and a sealing material 48 for sealing the cut 44 of the seal 42. The sealing material 48 protrudes from the cut 44 of the seal 42 to be stuck to the end faces of the upper substrate 34 and the lower substrate 36. The upper substrate 34 is thinner than the lower substrate 36 and, in the width direction of the upper substrate 34 and the lower substrate 36, the width of the end face of the upper substrate 34 is narrower than the end face of the lower substrate 36.

Description

  The present invention relates to a liquid crystal display device and a manufacturing method thereof.

  In recent years, products that meet the demand for stereoscopic display of images have been developed. As small and medium-sized devices such as mobile phones and portable information terminals, liquid crystal display devices equipped with a parallax barrier liquid crystal panel for naked eye viewing are available. Known (Patent Document 1).

JP 2004-294862 A

  The manufacturing process of the parallax barrier liquid crystal panel is the same as that of a normal liquid crystal panel, and includes a process of injecting liquid crystal into an empty cell and sealing with a sealing material. Therefore, the liquid crystal panel for parallax barrier also has a sealing material in the sealing port, and the amount of the protrusion becomes an obstacle when the liquid crystal panel for parallax barrier is housed in the casing. Therefore, there is a demand for minimizing the amount of popping out of the sealing material, and it is necessary to devise that.

  An object of the present invention is to minimize the protruding amount of the sealing material of the parallax barrier liquid crystal panel.

  (1) The liquid crystal display device according to the present invention includes a liquid crystal display panel and the liquid crystal display panel for separating a left eye image and a right eye image displayed on the liquid crystal display panel to enable autostereoscopic viewing. A parallax barrier liquid crystal panel overlaid on the liquid crystal display panel, wherein the parallax barrier liquid crystal panel is disposed on a side opposite to the liquid crystal display panel. An upper substrate, a seal disposed between the upper substrate and the lower substrate and surrounding the space so as to have a cut, a liquid crystal filled in the space, and a sealing material for sealing the cut of the seal The sealing material protrudes from the cut of the seal and adheres to end surfaces of the upper substrate and the lower substrate, and the upper substrate is thinner than the lower substrate, and the upper substrate and the lower substrate In front of the upper substrate in the thickness direction of Width of the end face, and wherein the narrower than the width of the end face of the lower substrate. According to the present invention, since the amount of the sealing material attached can be reduced because the width of the upper substrate is narrow, the protruding amount of the sealing material of the parallax barrier liquid crystal panel can be reduced. In addition, since the lower substrate is thicker than the upper substrate, the amount of protrusion of the sealing material can be reduced by making only the upper substrate thinner without changing the distance from the liquid crystal display panel to the liquid crystal of the parallax barrier liquid crystal panel. Can be reduced.

  (2) In the display device described in (1), the sealing material may be attached to the end surface over the entire width of the upper substrate and the entire width of the lower substrate. Good.

  (3) In the display device described in (1) or (2), the sealing material may be provided by curing a liquid resin precursor.

  (4) A method of manufacturing a liquid crystal display device according to the present invention enables a stereoscopic vision by preparing a liquid crystal display panel and separating a left eye image and a right eye image displayed on the liquid crystal display panel. A process of assembling the parallax barrier liquid crystal panel, and a process of assembling and mounting the parallax barrier liquid crystal panel on the liquid crystal display panel. A seal having a cut is disposed between the empty cells surrounding the space, filling the space with the liquid crystal from the cut, and sealing the cut of the seal with a sealing material, The step of sealing with a sealing material includes providing a liquid resin precursor so as to close the cut and adhere to the end surfaces of the upper substrate and the lower substrate, and the upper substrate is different from the lower substrate. The width of the end surface of the upper substrate is narrower than the width of the end surface of the lower substrate in the thickness direction of the upper substrate and the lower substrate, and the parallax barrier liquid crystal panel is disposed on the liquid crystal display panel side. The lower substrate is disposed on and attached to the liquid crystal display panel. According to the present invention, since the amount of the sealing material attached can be reduced because the width of the upper substrate is narrow, the protruding amount of the sealing material of the parallax barrier liquid crystal panel can be reduced. In addition, since the lower substrate is thicker than the upper substrate, the amount of protrusion of the sealing material can be reduced by making only the upper substrate thinner without changing the distance from the liquid crystal display panel to the liquid crystal of the parallax barrier liquid crystal panel. Can be reduced.

  (5) In the method of manufacturing a display device described in (4), the resin precursor is attached to the end surface over the entire width of the upper substrate and the entire width of the lower substrate. Also good.

It is a top view which shows the liquid crystal display device which concerns on embodiment of this invention. It is the II-II sectional view taken on the line of the liquid crystal display device shown in FIG. It is a top view which shows a liquid crystal display panel. It is a top view which shows the liquid crystal panel for parallax barriers. It is a figure explaining the process of assembling the liquid crystal panel for parallax barriers. It is a figure explaining the process of assembling the liquid crystal panel for parallax barriers. It is a figure explaining the process of assembling the liquid crystal panel for parallax barriers. It is a figure explaining the process of assembling the liquid crystal panel for parallax barriers. It is a figure explaining the process of assembling the liquid crystal panel for parallax barriers.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the liquid crystal display device shown in FIG. 1 taken along the line II-II.

  The liquid crystal display device includes a liquid crystal display panel 10. FIG. 3 is a plan view showing the liquid crystal display panel 10. The liquid crystal display panel 10 is not limited to a structure or a system such as a TN (Twisted Nematic) type, an STN (Super Twisted Nematic) type, a VA (Vertical Alignment) system, an IPS (In-Plane Switching) system, etc. Has a pair of transparent substrates 12 and 14 made of glass, etc., and a liquid crystal (not shown) is sandwiched between the two substrates 12. One substrate 12 is a TFT (Thin Film Transistor) substrate, and the other substrate 14 is Polarizing plates 16 and 18 are attached to opposite surfaces of the pair of substrates 12 and 14. The integrated circuit chip 20 is mounted on the substrate 12, and a flexible wiring substrate. The flexible wiring board 22 has a wiring pattern (not shown).

  As shown in FIG. 2, a light guide plate 24 is disposed so as to overlap the liquid crystal display panel 10. The light guide plate 24 converts light incident from a point light source (not shown) into a surface light source. A reflection film 26 is disposed on the side of the light guide plate 24 opposite to the liquid crystal display panel 10 so that light emitted downward from the light guide plate 24 (on the side opposite to the liquid crystal display panel 10) is reflected back to the light guide plate 24. It has become. A backlight is configured by adding a light source and an optical film (not shown) to the light guide plate 24 and the reflection film 26. The liquid crystal display panel 10 is supported by a frame 28 formed by resin molding. The liquid crystal display panel 10 and the frame 28 are fixed with a double-sided tape 30.

  The liquid crystal display device according to the present embodiment enables stereoscopic image display. Specifically, different two-dimensional images are recognized by the left and right eyes of the person, and the brain constructs a three-dimensional space based on the two two-dimensional images. Therefore, the left eye image and the right eye image are displayed on the liquid crystal display panel 10.

  The liquid crystal display device includes a parallax barrier liquid crystal panel 32. FIG. 4 is a plan view showing the parallax barrier liquid crystal panel 32. The parallax barrier liquid crystal panel 32 separates the left eye image and the right eye image displayed on the liquid crystal display panel 10 by a parallax barrier method (parallax barrier method) to enable autostereoscopic viewing. . The parallax barrier method (parallax barrier method) is a vertical stripe filter (parallax barrier) superimposed on the image display surface, so that only the left-eye image is displayed on the left eye and only the right-eye image is displayed on the right eye This is the method.

  As shown in FIG. 2, the parallax barrier liquid crystal panel 32 is larger than the liquid crystal display panel 10, and the end portion protrudes from the liquid crystal display panel 10. The parallax barrier liquid crystal panel 32 includes an upper substrate 34 and a lower substrate 36. Both the upper substrate 34 and the lower substrate 36 are made of transparent glass or the like. The parallax barrier liquid crystal panel 32 is arranged with the lower substrate 36 facing the liquid crystal display panel 10. The upper substrate 34 is disposed on the side opposite to the liquid crystal display panel 10. As shown in FIG. 4, a flexible wiring board 38 is also attached to the parallax barrier liquid crystal panel 32.

  As shown in FIG. 2, the parallax barrier liquid crystal panel 32 is overlaid on the liquid crystal display panel 10, and both are bonded by an adhesive 40 (for example, an ultraviolet curable adhesive) forming a layer. Specifically, the lower substrate 36 of the parallax barrier liquid crystal panel 32 and the polarizing plate 18 of the liquid crystal display panel 10 are bonded. The polarizing plate 18 also serves as a polarizing plate below the parallax barrier liquid crystal panel 32. A polarizing plate 41 is attached to the upper substrate 34 of the parallax barrier liquid crystal panel 32.

  The upper substrate 34 and the lower substrate 36 face each other so that a gap (not shown) is formed. A seal 42 (see FIG. 9) is disposed between the upper substrate 34 and the lower substrate 36. The seal 42 has a cut 44 (see FIG. 9). A space surrounded by the seal 42 is filled with liquid crystal 46 (see FIG. 9). As shown in FIG. 2, the cut 44 of the seal 42 is sealed with a sealing material 48. The sealing material 48 is provided by curing the liquid resin precursor 50 (see FIG. 9). The sealing material 48 protrudes from the cut 44 of the seal 42. The sealing material 48 is attached to the end surfaces of the upper substrate 34 and the lower substrate 36.

  5 to 9 are diagrams for explaining a process of assembling the parallax barrier liquid crystal panel 32. As shown in FIG. 5, an empty cell 52 is prepared in which a seal 42 having a cut 44 is disposed between the upper substrate 34 and the lower substrate 36 so that the seal 42 surrounds the space. A container 56 containing liquid crystal 46 is prepared in the vacuum chamber 54.

  As shown in FIG. 6, after the vacuum chamber 54 is evacuated, the cut 44 (injection port) of the seal 42 is brought into contact with the liquid crystal 46. As shown in FIG. 7, when the sealed state of the vacuum chamber 54 is released and air leaks, the liquid crystal 46 is filled into the empty cell 52 (the space surrounded by the seal 42) from the cut 44 of the seal 42. . Then, liquid crystal 46 is filled as shown in FIG. Thereafter, as shown in FIG. 9, a liquid resin precursor 50 is provided so as to close the cut 44 and adhere to the end surfaces of the upper substrate 34 and the lower substrate 36. For example, the resin precursor 50 is provided by discharging. The resin precursor 50 is attached to the end surface over the entire width of the upper substrate 34 and the entire width of the lower substrate 36. The resin precursor 50 is cured to become a sealing material 48 (see FIG. 2). The sealing material 48 seals the cut 44 of the seal 42.

  The upper substrate 34 used for the parallax barrier liquid crystal panel 32 is thinner than the lower substrate 36 as shown in FIG. In the thickness direction of the upper substrate 34 and the lower substrate 36, the width of the end surface of the upper substrate 34 is narrower than the width of the end surface of the lower substrate 36. The sealing material 48 is attached to the end surface over the entire width of the upper substrate 34 and the entire width of the lower substrate 36.

  According to the present embodiment, since the width of the upper substrate 34 is narrow, the amount of the sealing material 48 attached can be reduced, so that the protrusion amount L of the sealing material 48 of the parallax barrier liquid crystal panel 32 can be reduced. . The protruding amount L of the sealing material 48 is smaller than when the upper substrate 34 has the same thickness as the lower substrate 36.

  Further, since the lower substrate 36 is thicker than the upper substrate 34, only the upper substrate 34 is changed without changing the distance from the liquid crystal display panel 10 to the liquid crystal 46 (see FIG. 9) of the parallax barrier liquid crystal panel 32. By reducing the thickness, the protruding amount L of the sealing material 48 can be reduced.

  In the method for manufacturing the liquid crystal display device 46 according to the present embodiment, the liquid crystal display panel 10 is prepared. Further, as described above with reference to FIGS. 5 to 9, the parallax barrier liquid crystal panel 32 is assembled. Then, the parallax barrier liquid crystal panel 32 is overlaid and pasted on the liquid crystal display panel 10.

  The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the configuration described in the embodiment can be replaced with substantially the same configuration, a configuration that exhibits the same operational effects, or a configuration that can achieve the same purpose.

  DESCRIPTION OF SYMBOLS 10 Liquid crystal display panel, 12 board | substrate, 14 board | substrate, 16 polarizing plate, 18 polarizing plate, 20 integrated circuit chip, 22 flexible wiring board, 24 light guide plate, 26 reflective film, 28 frame, 30 double-sided tape, 32 parallax barrier liquid crystal panel , 34 Upper substrate, 36 Lower substrate, 38 Flexible wiring substrate, 40 Adhesive, 41 Polarizer, 42 Seal, 44 Cut, 46 Liquid crystal, 48 Sealant, 50 Resin precursor, 52 Empty cell, 54 Vacuum chamber, 56 container.

Claims (5)

A liquid crystal display panel;
A parallax barrier liquid crystal panel overlaid on the liquid crystal display panel in order to separate the left eye image and the right eye image displayed on the liquid crystal display panel and enable autostereoscopic viewing;
Have
The parallax barrier liquid crystal panel is disposed between the lower substrate disposed on the liquid crystal display panel side, the upper substrate disposed on the opposite side of the liquid crystal display panel, and the upper substrate and the lower substrate. A seal surrounding the space so as to have a cut, a liquid crystal filled in the space, and a sealing material for sealing the cut of the seal,
The sealing material sticks to the end surfaces of the upper substrate and the lower substrate, protruding from the cut of the seal,
The upper substrate is thinner than the lower substrate,
The liquid crystal display device, wherein a width of the end surface of the upper substrate is narrower than a width of the end surface of the lower substrate in the thickness direction of the upper substrate and the lower substrate. The display device according to claim 1,
The liquid crystal display device, wherein the sealing material adheres to the end face over the entire width of the upper substrate and the entire width of the lower substrate. The display device according to claim 1 or 2,
The liquid crystal display device, wherein the sealing material is provided by curing a liquid resin precursor. Preparing a liquid crystal display panel;
Assembling a parallax barrier liquid crystal panel for separating a left eye image and a right eye image displayed on the liquid crystal display panel to enable autostereoscopic viewing;
A step of stacking and pasting the parallax barrier liquid crystal panel on the liquid crystal display panel;
Including
The step of assembling the liquid crystal panel for parallax barrier includes the step of placing a seal having a cut between an upper substrate and a lower substrate, filling the space with the liquid crystal from the cut to the empty cell surrounding the space, and sealing the seal. Sealing the cut line with a sealing material,
The step of sealing with the sealing material includes providing a liquid resin precursor so as to close the cut and adhere to the end surfaces of the upper substrate and the lower substrate,
The upper substrate is thinner than the lower substrate,
In the thickness direction of the upper substrate and the lower substrate, the width of the end surface of the upper substrate is narrower than the width of the end surface of the lower substrate,
The method for manufacturing a liquid crystal display device, wherein the parallax barrier liquid crystal panel has the lower substrate disposed on the liquid crystal display panel side and is attached to the liquid crystal display panel. In the manufacturing method of the display device according to claim 4,
The method of manufacturing a liquid crystal display device, wherein the resin precursor is attached to the end face over the entire width of the upper substrate and the entire width of the lower substrate.

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