JP2012047895A - Liquid crystal display device and television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device and a television receiver which is capable of reducing deterioration of an image quality caused by a light shielding part provided on a protection plate, applying to a display of a three dimensional image, and further corresponding to requirements for thinner products.SOLUTION: A glass protection plate 3 having one surface thereof overlaid on a display surface of a liquid crystal panel 2 has the other surface thereof adhered to a polarizer 4. A light shielding part 40 is formed in such a manner as to rim the periphery part of the polarizer 4 to allow the protection plate 3 to hold original optical isotropy thereof, and thus prevent quality deterioration of a display image. The polarizer 4 works to prevent glass pieces from scattering when the protection plate 3 is damaged. The polarizer 4 also works as an upside polarizer provided originally on the liquid crystal panel 2 helping realization of a thinner liquid crystal display device.

Description

  The present invention relates to a liquid crystal display device using a liquid crystal panel for image display, and a television receiver including the liquid crystal display device.

  A liquid crystal display device including a liquid crystal panel as an image display unit is widely used as a display unit for a television receiver, a computer, and a portable terminal because it is thin and lightweight and consumes less power.

  A liquid crystal display device exposes one surface (display surface) of a liquid crystal panel to be attached to an outer box, and displays an image by polarizing light emitted from a light source (backlight) provided in the outer box with liquid crystal. A liquid crystal panel forms a panel original plate by enclosing liquid crystal between an array substrate having a drive element array and a color filter substrate (CF substrate) formed by patterning a color filter, and on both sides of the panel original plate, A polarizing plate (an upper polarizing plate and a lower polarizing plate) is laminated, and an optical sheet such as a field-of-view expansion sheet or an antireflection sheet is further attached as necessary.

  Some liquid crystal display devices include a protective plate that is disposed so as to overlap the display surface of the liquid crystal panel (see, for example, Patent Document 1). The protective plate is made of glass and covers the display surface of the liquid crystal panel while maintaining optical isotropy, thereby protecting the display surface. Further, a light shielding part having a light shielding property may be provided on the periphery of the protective plate. The light-shielding part is formed over the entire circumference of the peripheral part of the protective plate over an appropriate width in order to prevent visual recognition of a driver part and the like provided around the liquid crystal panel covered with the protective plate.

  This light-shielding part is formed by baking printing using a light-shielding ceramic paint (generally a black paint). Furthermore, a scattering prevention sheet may be attached to one surface of the protective plate. The anti-scattering sheet is a sheet made of resin such as PET (polyethylene terephthalate), and when the glass plate is damaged by the action of an excessive external force, the anti-scattering sheet prevents the glass pieces from being scattered around.

JP 2009-216764 A

  However, the light-shielding part formed by ceramic baking printing has good fixability to the glass surface and has high strength, but requires baking during the formation process, so that heating and cooling during firing are performed appropriately. Otherwise, non-uniform stress remains inside the protective plate on which the light-shielding part is formed, the optical isotropy of the glass protective plate is impaired, and the light emitted through the protective plate becomes elliptically polarized light. There is a problem that the quality of the display image of the liquid crystal panel is deteriorated. In addition, when the above-described scattering prevention sheet is provided, the scattering prevention sheet is made of a resin material having birefringence such as PET, so that a reduction in display image quality is promoted.

  On the other hand, in recent years, a liquid crystal display device capable of displaying a three-dimensional image and a television receiver provided with the liquid crystal display device have been put into practical use. In this type of liquid crystal display device and television receiver, glasses using polarizing plates as lenses are used to give a sense of depth by visually recognizing different images on the left and right eyes of the viewer.

  When the above-described protective plate is used for a liquid crystal display device and a television receiver that can display three-dimensional images, the elliptical polarized light interferes when it passes through the right and left polarizing plates, and the viewer is referred to as “rainbow unevenness”. As a result, the interference fringes are visually recognized, and there is a problem that the deterioration of the quality of the display image is remarkably recognized.

  Further, in the liquid crystal display device provided with the protective plate described above, the liquid crystal module including the protective plate becomes thick, and there is a problem that the liquid crystal display device and the television receiver cannot meet the demand for thinning.

  The present invention has been made in view of such circumstances, and can be applied to display of a three-dimensional image by mitigating deterioration in image quality due to the provision of a light-shielding portion on a protective plate. An object of the present invention is to provide a liquid crystal display device and a television receiver that can meet the above requirements.

  The liquid crystal display device according to the present invention includes a liquid crystal panel formed by laminating polarizing plates on both sides of a panel original plate in which liquid crystal is sealed between an array substrate and a color filter substrate, and a display surface of the liquid crystal panel. In a liquid crystal display device that is disposed so as to overlap one surface and that is provided with a glass protective plate that protects the display surface, and is provided with a light-shielding portion so as to border the peripheral portion of the protective plate, one of the liquid crystal panels The polarizing plate is disposed so as to overlap the other surface of the protective plate, and the light shielding portion is formed on the polarizing plate by printing using a paint having a light shielding property.

  In the present invention, a polarizing plate is laminated on the other surface of the protective plate (the surface opposite to the contact surface with the liquid crystal panel), and a light shielding portion is formed on the polarizing plate. Prevents stress from being generated in the protective plate. The light-shielding portion provided in the polarizing plate can be formed by a suitable printing method such as gravure printing using a paint having a light-shielding property. The polarizing plate also serves as a polarizing plate (upper polarizing plate) originally provided in the liquid crystal panel, suppresses an increase in thickness due to a new arrangement of the polarizing plate, and meets the demand for thinning.

  Moreover, the liquid crystal display device according to the present invention is characterized in that the light shielding portion is formed on a contact surface with the protective plate.

  In this invention, a light shielding part is provided on the contact surface with the protective plate among both surfaces of the polarizing plate, and the printing layer forming the light shielding part is prevented from being peeled off by the action of an external force applied during use. The light-shielding function can be maintained throughout.

  A television receiver according to the present invention includes the above-described liquid crystal display device as a display unit for a received image.

  In this invention, stress is generated in the protective plate made of glass, the display image of the liquid crystal panel viewed through the protective plate is kept in good quality, the received image can be displayed with high quality, and the three-dimensional image Provide a TV receiver that can also display

  In the liquid crystal display device and the television receiver according to the present invention, the polarizing plate is laminated on the glass protective plate, and the light shielding portion is formed on the polarizing plate instead of the protective plate. The display panel can be applied to the display of a three-dimensional image, and the light shielding part is provided while the surroundings of the liquid crystal panel are hidden by the light shielding part. Since the polarizing plate also serves as the polarizing plate originally provided in the liquid crystal panel, the present invention has excellent effects such as being able to meet the demand for thinning.

1 is a schematic cross-sectional view of a liquid crystal display device according to the present invention. It is a perspective view of the polarizing plate used for the liquid crystal display device of FIG. It is a disassembled perspective view of the television receiver concerning this invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. FIG. 1 is a schematic cross-sectional view of a liquid crystal display device according to the present invention. As shown in the figure, the liquid crystal display device 1 includes a liquid crystal panel 2 for displaying an image, and a protective plate 3 arranged on one surface of the display surface of the liquid crystal panel 2. A stacked polarizing plate 4 is provided.

  In the liquid crystal panel 2, a polarizing plate 23 is attached to one surface of the panel original plate (the outer surface of the array substrate 20) in which the liquid crystal 22 is sealed between the array substrate 20 and the color filter substrate 21, and a field expansion sheet and reflection An optical sheet (not shown) having desired optical characteristics such as a prevention sheet is attached.

  The protective plate 3 is a glass plate that is slightly larger in size than the liquid crystal panel 2 and is laminated so as to cover the entire display surface of the liquid crystal panel 2 (the outer surface of the color filter substrate 21). The polarizing plate 4 is formed by cutting a thin plate material or sheet material having polarization characteristics into approximately the same size as the protective plate 3, and the entire outer surface of the protective plate 3 (the surface opposite to the liquid crystal panel 2). It is laminated so as to cover it. The protective plate 3, the liquid crystal panel 2, and the polarizing plate 4 are attached integrally with each other by, for example, a translucent adhesive.

  FIG. 2 is a perspective view of the polarizing plate 4, and shows a contact surface with the protective plate 3 as an upper side. As shown in the figure, a light shielding portion 40 is provided on the peripheral edge of the polarizing plate 4. The light shielding portion 40 is formed so as to border the entire circumference over an appropriate width by printing using a paint having a light shielding property (generally a black paint). The polarizing plate 4 is a thin plate or sheet, and the light shielding portion 40 is a thin printed layer. However, in FIG. 2, the sizes of the polarizing plate 4 and the light shielding portion 40 are shown in order to clearly show the configurations of the polarizing plate 4 and the light shielding portion 40. The thickness is enlarged with respect to the thickness. As shown in FIG. 1, the polarizing plate 4 on which the light shielding portion 40 is formed is attached such that the surface on which the light shielding portion 40 is formed contacts the outer surface of the protective plate 3. The protective plate 3 and the liquid crystal panel 2 are positioned so as to cover the peripheral portions.

  As shown in FIG. 1, a liquid crystal display device 1 has a liquid crystal panel 2 attached to an outer box (backlight chassis) 10 with a display surface on which a protective plate 3 and a polarizing plate 4 are laminated facing outward. The other surface of the panel 2 is configured with a light source (backlight) 11 provided inside the outer box 10 facing it.

  The liquid crystal display device 1 configured as described above transmits light emitted from the light source 11 to the liquid crystal panel 2 and adjusts the degree of polarization by driving the liquid crystal sealed in the liquid crystal panel 2, thereby An image is displayed on the display surface of the liquid crystal panel 2 exposed to. The user faces the display surface of the liquid crystal panel 2 and visually recognizes the display image through the protective plate 3 and the polarizing plate 4.

  The protection plate 3 covers the display surface of the liquid crystal panel 2 exposed to the outside and functions to protect the display surface from external force. The polarizing plate 4 attached to the protective plate 3 serves to prevent the generated glass pieces from being scattered to the periphery when the glass protective plate 3 is damaged by the action of excessive force applied from the outside. . The polarizing plate 4 also serves as an upper polarizing plate that forms a pair with the polarizing plate 23 (lower polarizing plate) laminated on the outer surface of the array substrate 20, and functions as a constituent member of the liquid crystal panel 2.

  The light shielding portion 40 provided at the peripheral edge of the polarizing plate 4 is provided so as to hide the periphery of the liquid crystal panel 2 in which a driver circuit for driving the liquid crystal is disposed from the outside so as to be invisible. As described above, since the light shielding portion 40 is not formed on the protective plate 3 made of glass but on the polarizing plate 4 attached to the protective plate 3, the light shielding portion 40 is formed on the protective plate 3. The accompanying stress does not occur, and the protective plate 3 maintains the original optical isotropy of the glass.

  The light shielding part 40 formed on the polarizing plate 4 can be formed by an appropriate printing method such as gravure printing. The characteristics of the polarizing plate 4 are not impaired by the formation of the light shielding portion 40 by printing. Therefore, the quality of the display image visually recognized through the protective plate 3 and the polarizing plate 4 can be kept good, and the liquid crystal display device 1 can display a three-dimensional image without causing the “rainbow unevenness”. It becomes possible.

  Since the polarizing plate 4 provided with the light shielding part 40 also serves as one of the two polarizing plates originally provided in the liquid crystal panel 2 (upper polarizing plate), the thickness of the liquid crystal panel 2 including the protective plate 3 is the polarizing plate 4. Therefore, the liquid crystal display device 1 can meet the demand for thinning.

  The light shielding portion 40 is formed on one surface of the polarizing plate 4 on the side in contact with the protective plate 3. The light-shielding part 40 formed in this way has no fear of peeling off due to an external force applied during use, and maintains the original function of the light-shielding part 40 for hiding the peripheral part of the liquid crystal panel 2 for a long period of time. Is possible.

  FIG. 3 is an exploded perspective view of the television receiver according to the present invention. As shown in the figure, the television receiver TV includes the liquid crystal display device 1 configured as described above as a display unit for a received image, and the front and back of the liquid crystal display device 1 are surrounded by a front cabinet 5a and a rear cabinet 5b. A circuit board such as a power supply board 6 and a tuner board 7 and a peripheral device unit such as a speaker unit (not shown) are assembled in the rear cabinet 5b, and a support leg 8 is provided below the rear cabinet 5b. Installed and configured.

  In the television receiver TV configured as described above, the display surface of the liquid crystal panel 2 constituting the liquid crystal display device 1 is protected by the protective plate 3, so that the liquid crystal panel 2 is damaged by an external force applied during use. In addition to reducing the fear, the influence of the light shielding portion 40 provided so as to border the periphery of the protection plate 3 can be eliminated, and the received image can be displayed with high quality, and the display of the three-dimensional image is possible. It becomes possible to cope with.

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Liquid crystal panel 3 Protection board 4 Polarizing plate
20 Array board
21 Color filter substrate
22 LCD
40 Shading unit TV TV receiver

Claims (3)

A liquid crystal panel formed by laminating polarizing plates on both sides of a panel original plate in which liquid crystal is sealed between an array substrate and a color filter substrate, and a display surface of the liquid crystal panel are disposed so as to overlap the display surface. In a liquid crystal display device provided with a protective plate made of glass for protecting the surface, and provided with a light shielding portion so as to border the peripheral portion of the protective plate,
One polarizing plate of the liquid crystal panel is disposed so as to overlap the other surface of the protective plate, and the light shielding portion is formed on the polarizing plate by printing using a paint having a light shielding property. A liquid crystal display device.   The liquid crystal display device according to claim 1, wherein the light shielding portion is formed on a contact surface with the protection plate.   A television receiver comprising the liquid crystal display device according to claim 1 or 2 as a display unit for a received image.

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