JP2010060840A - Display device - Google Patents

Abstract

In a display panel deformed into a curved shape, a substrate on a concave surface side is prevented from being locally bent.
A display panel 10 is bonded to a first substrate 11 and a second substrate 15 so as to face each other, the display panel 10 is deformed into a curved shape, and the first substrate 11 is disposed on the concave surface side. In the display device S in which the second substrate 15 is arranged on the convex surface side, the substrate 12 constituting the first substrate 11 is thicker than the substrate 16 constituting the second substrate 15.
[Selection] Figure 2

Description

The present invention relates to a display device.

  Conventionally, a liquid crystal display device having a liquid crystal display panel is known as a display device. In a liquid crystal display panel, for example, a pair of substrates including a color filter substrate having a plurality of color filters and a thin film transistor substrate having a plurality of thin film transistors are bonded to each other, and a liquid crystal layer is provided between the pair of substrates. Configured.

As the liquid crystal display device, there is a liquid crystal display device having a curved liquid crystal display panel in addition to a flat liquid crystal display panel. In such a liquid crystal display device, for example, as disclosed in Patent Document 1, each substrate of a liquid crystal display panel is made of an ultra-thin (0.01 to 0.15 mm thick) glass substrate, Each substrate is manufactured by using a flexible plastic substrate.
JP 2003-337550 A

  FIG. 3 is a cross-sectional view schematically showing the liquid crystal display panel 100 before being deformed into a curved shape in a conventional liquid crystal display device. FIG. 4 is a cross-sectional view schematically showing the liquid crystal display panel 100 after being deformed into a curved shape in a conventional liquid crystal display device.

  In the production of the curved liquid crystal display panel as described above, as shown in FIG. 3, the substrate 102 constituting the substrate 101 disposed on the concave surface side of the color filter substrate or the like is disposed on the convex surface side of the thin film transistor substrate or the like. When the liquid crystal display panel 100 is deformed into a curved shape, the thickness is equal to that of the substrate 104 constituting the substrate 103 to be formed on the substrate 102 constituting the concave substrate 101 as shown in FIG. In order to relieve the compressive stress, the substrate 101 on the concave side is easily bent locally on the side opposite to the substrate 103 on the convex side, so that the thickness of the liquid crystal layer 105 is uneven and distortion occurs in the display. The quality is likely to deteriorate. In particular, when the substrate constituting the concave substrate is thinner than the substrate constituting the convex substrate, the concave substrate tends to be locally bent more easily.

  The present invention has been made in view of such various points, and an object thereof is to suppress local bending of a concave-side substrate in a curved display panel.

  In order to achieve the above object, according to the present invention, in the display panel in which the first substrate and the second substrate are bonded so as to face each other and deformed into a curved shape, the first substrate disposed on the concave surface side is configured. The substrate to be made thicker than the substrate constituting the second substrate arranged on the convex surface side.

  Specifically, a display device according to the present invention includes a display panel bonded so that a first substrate and a second substrate face each other, the display panel is deformed into a curved shape, and the first substrate is a concave surface. The display device is arranged on the side, and the second substrate is arranged on the convex side, wherein the substrate constituting the first substrate is thicker than the substrate constituting the second substrate. To do.

According to this configuration, when the display panel is deformed into a curved shape because the substrate constituting the first substrate arranged on the concave side is thicker than the substrate constituting the second substrate arranged on the convex side In addition, the first substrate is prevented from being locally bent by the compressive stress generated in the substrate constituting the concave first substrate.
Each substrate constituting the first substrate and the second substrate may be a glass substrate.

  Since a glass substrate is a substrate having a relatively high Young's modulus and formed from a brittle material, it is difficult to be greatly deformed against stress. Therefore, when each substrate constituting the first substrate and the second substrate is a glass substrate as in the above configuration, the display panel is curved as compared with the case where each substrate is a plastic substrate or the like. When the first substrate is deformed, it is further suppressed that the first substrate is locally bent.

  And when each board | substrate which comprises a 1st board | substrate and a 2nd board | substrate is a glass substrate, respectively, the difference of the thickness of the board | substrate which comprises the said 1st board | substrate and the board | substrate which comprises the said 2nd board | substrate is 0. It is preferable that the thickness is 1 mm or more and the thickness of the display panel is 0.6 mm or less.

  When each substrate constituting the first substrate and the second substrate is a glass substrate, the difference in thickness between the glass substrate constituting the first substrate and the glass substrate constituting the second substrate is less than 0.1 mm. In such a case, the first substrate may not be sufficiently suppressed from being locally bent. When the thickness of the display panel is larger than 0.6 mm, a relatively large tensile stress is applied to the glass substrate constituting the second substrate in the curved display panel. The second substrate is relatively easy to break. In contrast, as described above, the difference in thickness between the glass substrate constituting the first substrate and the glass substrate constituting the second substrate is 0.1 mm or more, and the thickness of the display panel is 0. When it is .6 mm or less, the first substrate is sufficiently suppressed from being locally bent and the second substrate is favorably suppressed from cracking.

  The display panel may include a liquid crystal layer provided between the first substrate and the second substrate.

  According to this configuration, the effect of the present invention is specifically achieved for a liquid crystal display device having a liquid crystal display panel in which a liquid crystal layer is provided between the first substrate and the second substrate.

  According to the present invention, in the display panel in which the first substrate and the second substrate are bonded so as to face each other and deformed into a curved shape, the substrate constituting the first substrate disposed on the concave surface side is arranged on the convex surface side. Since it is thicker than the board | substrate which comprises the arrange | positioned 2nd board | substrate, it can suppress that a 1st board | substrate bends locally.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments.

Embodiment 1 of the Invention
1 and 2 show Embodiment 1 of the present invention. FIG. 1 is a plan view schematically showing a liquid crystal display device S of the present embodiment. FIG. 2 is a cross-sectional view schematically showing the liquid crystal display device S along the line II-II in FIG. In FIG. 1, illustration of a polarizing plate described later is omitted.

  As shown in FIGS. 1 and 2, the liquid crystal display device S includes a liquid crystal display panel 10 and a backlight unit 25, and a surface on one side (upper side in FIG. 2) of the liquid crystal display panel 10 displays an image. The display surface D is configured.

  The liquid crystal display panel 10 is configured such that a color filter substrate 11 as a rectangular first substrate and a thin film transistor substrate 15 as a second substrate are bonded to each other through a frame-shaped sealing material 19 so as to face each other. Yes. In the liquid crystal display panel 10, the color filter substrate 11 is disposed on the display surface D side, and the thin film transistor substrate 15 is disposed on the back side (lower side in FIG. 2). Each of these substrates 11 and 15 constituting the liquid crystal display panel 10 has flexibility as will be described later, and the liquid crystal display panel 10 is fixed in a curved state as a whole.

  Specifically, as shown in FIGS. 1 and 2, the liquid crystal display panel 10 is deformed into a curved shape in the long side direction (direction indicated by an arrow in FIG. 1) so that the display surface D becomes a concave curved surface. ing. That is, in the liquid crystal display panel 10, the color filter substrate 11 is disposed on the concave surface side, and the thin film transistor substrate 15 is disposed on the convex surface side. The liquid crystal display panel 10 has a curved surface with a curvature of the display surface D of, for example, about 1/1000 to 1/50 (1 / mm).

  In the present embodiment, the liquid crystal display panel 10 is curved in the long side direction, but the liquid crystal display panel 10 is in the short side direction (the direction orthogonal to the direction indicated by the arrow in FIG. 1). It may be deformed into a curved shape. The direction in which the liquid crystal display panel 10 is deformed into a curved shape is not limited to the above-described one, and for example, the rectangular display surface of the liquid crystal display panel 10 may be deformed into a curved shape in an oblique direction.

  A liquid crystal layer 20 is formed between the color filter substrate 11 and the thin film transistor substrate 15 by sealing a liquid crystal material inside the sealing material 19. Each of the color filter substrate 11 and the thin film transistor substrate 15 has an alignment film (not shown) formed on the surface on the liquid crystal layer 20 side, and a polarizing plate on the surface opposite to the liquid crystal layer 20 as shown in FIG. 21 and 22 are provided, respectively.

  As shown in FIG. 2, the color filter substrate 11 has a thin glass substrate 12, and a pixel configuration unit 13 that configures a plurality of pixels is provided on the surface of the glass substrate 12 so as to overlap the display surface D. It has been. In the pixel configuration unit 13, a plurality of color filters are provided in a matrix corresponding to each pixel, and a black matrix is formed so as to partition each color filter. Furthermore, a common electrode is formed in the pixel configuration unit 13 so as to cover each color filter.

  The thin film transistor substrate 15 includes a thin glass substrate 16, and a pixel configuration unit 17 that configures a plurality of pixels is provided on the surface of the glass substrate 16 so as to overlap the display surface D. In the pixel configuration portion 17, a plurality of source lines are formed so as to extend in parallel with each other, and a plurality of gate lines are formed so as to extend in parallel with each other so as to be orthogonal to the respective source lines. The source line and the gate line define a plurality of pixels in a matrix. Thin film transistors connected to the source lines and the gate lines forming the respective intersections are formed in the vicinity of the intersections of the source lines and the gate lines in the regions constituting the respective pixels, and connected to the thin film transistors. A pixel electrode is formed.

  Further, as shown in FIGS. 1 and 2, the thin film transistor substrate 15 is formed in a long area longer than the color filter substrate 11 in the long side direction of the liquid crystal display panel 10, and protrudes outward from the color filter substrate 11. The mounting portion 15a is provided. The mounting portion 15a includes a driving circuit chip 23 for driving a thin film transistor and the like, a flexible printed wiring board 24 for supplying power to the driving circuit chip 23 and a signal from an external circuit to the liquid crystal display panel 10 and the like. Has been implemented.

  In the liquid crystal display panel 10, the glass substrate 12 constituting the color filter substrate 11 is formed thicker than the glass substrate 16 constituting the thin film transistor substrate 15. As a result, in manufacturing the liquid crystal display device 10, when the liquid crystal display panel 10 is deformed into a curved shape, the color filter substrate 11 becomes thin film transistor substrate 15 due to the compressive stress generated in the glass substrate 12 constituting the color filter substrate 11. Local bending to the opposite side is suppressed.

  By the way, when the difference in thickness d1, d2 between the glass substrate 12 constituting the color filter substrate 11 and the glass substrate 16 constituting the thin film transistor substrate 15 is less than 0.1 mm, the color filter substrate 11 is locally There is a possibility that bending is not sufficiently suppressed. When the thickness d3 of the liquid crystal display panel 10 is larger than 0.6 mm, a relatively large tensile stress is applied to the glass substrate 16 constituting the thin film transistor substrate 15 in the curved liquid crystal display panel 10. As a result, the thin film transistor substrate 15 is relatively easily broken.

  Therefore, the difference in thickness d1, d2 between the glass substrate 12 constituting the color filter substrate 11 and the glass substrate 16 constituting the thin film transistor substrate 15 is 0.1 mm or more, and the thickness of the liquid crystal display panel 10 is increased. The length d3 is preferably 0.6 mm or less. In the present embodiment, for example, the glass substrate 12 constituting the color filter substrate 11 is formed to a thickness d1 of 0.2 mm, the glass substrate 16 constituting the thin film transistor substrate 15 is formed to a thickness d2 of 0.1 mm, The thickness d3 of the liquid crystal display panel 10 is about 0.3 mm.

  The backlight unit 25 is disposed on the back side (lower side in FIG. 2) of the liquid crystal display panel 10. Although not shown, the backlight unit 25 includes a light guide plate, a light source that irradiates light to the light guide plate, a reflection sheet, and a prism sheet. Each of the light guide plate, the reflection sheet, and the prism sheet is formed of resin or the like and has flexibility. The entire backlight unit 25 is deformed into a curved shape along the liquid crystal display panel 10.

  As the light source of the backlight unit 25, a fluorescent lamp (cold cathode tube), an LED (Light Emitting Diode), or the like is used. The light guide plate has a shape that improves efficiency and uniformity, and is formed with a plurality of prisms and the like. The reflection sheet is provided below the light guide plate and reflects light from the light source to the light guide plate. The prism sheet is provided on the light guide plate and adjusts the incident light to the liquid crystal display panel 10 so that the emitted light faces the front.

-Manufacturing method-
Next, a method for manufacturing the liquid crystal display device S will be described.

  First, as described above, two glass substrates 12 and 16 having different thicknesses are prepared. Next, a plurality of color filters, common electrodes, and the like are formed on one of the thicker glass substrates 12 to form the pixel component 13 and the color filter substrate 11 is manufactured. Then, an alignment film is formed on the surface of the color filter substrate 11 by a printing method or the like. In addition, a plurality of thin film transistors, pixel electrodes, and the like are formed on the other glass substrate 16 on the other side, thereby forming the pixel configuration portion 17 and manufacturing the thin film transistor substrate 15. An alignment film is also formed on the surface of the thin film transistor substrate 15 by a printing method or the like.

  Next, a sealing material 19 is applied and formed in a frame shape by drawing with a dispenser or a printing method so as to surround the pixel component 16 of the thin film transistor substrate 15. Next, a predetermined amount of liquid crystal material is dropped onto a region surrounded by the sealing material 19 on the thin film transistor substrate 15. Subsequently, the substrates 11 and 15 are aligned and arranged so that the pixel configuration portion 17 of the thin film transistor substrate 15 and the pixel configuration portion 13 of the color filter substrate 11 overlap in the evacuated processing chamber. , 15 are bonded to each other through a sealing material 19. Thereafter, the sealing material 19 is cured to bond the substrates 11 and 15 together. Thus, the liquid crystal display panel 10 is manufactured.

  In the present embodiment, a frame-shaped sealing material 19 is supplied to the thin film transistor substrate 15, a liquid crystal material is dropped inside the sealing material 19, and then the color filter substrate 11 and the thin film transistor substrate 15 are bonded to each other. The method for manufacturing the liquid crystal display panel 10 is described by way of example, but a thin-film transistor substrate is coated and formed with a substantially frame-shaped sealing material having a cut forming an inlet, and the color filter substrate is interposed through the sealing material. The liquid crystal display panel may be manufactured by a so-called vacuum injection method in which a thin film transistor and a thin film transistor are bonded to each other, and then a liquid crystal material is vacuum-injected from the injection port and then the injection port is sealed.

  Thereafter, polarizing plates 21 and 22 are attached to both sides of the liquid crystal display panel 10, and the integrated circuit chip 23 and the flexible printed wiring board 24 are mounted on the mounting portion 15 a of the thin film transistor substrate 15. Then, a backlight unit 25 prepared in advance is attached to the back side of the liquid crystal display panel 10, and the liquid crystal display panel 10 and the backlight unit 25 are deformed and fixed so that the display surface D becomes concave. The liquid crystal display device S shown in FIG. 1 is completed.

-Effect of Embodiment 1-
Therefore, according to the first embodiment, in the liquid crystal display panel 10 in which the color filter substrate 11 and the thin film transistor substrate 15 are bonded so as to face each other and deformed into a curved shape, the color filter substrate 11 disposed on the concave surface side is configured. The glass substrate 12 to be formed is thicker than the glass substrate 16 constituting the thin film transistor substrate 15 disposed on the convex side. As a result, when the liquid crystal display panel 10 is deformed into a curved shape, it is possible to suppress the color filter substrate 11 from being locally bent by the compressive stress generated in the glass substrate 12 constituting the color filter substrate 11. Thereby, it is possible to suppress deterioration in display quality due to unevenness in the thickness of the liquid crystal layer 20 and distortion in the display.

  Further, the glass substrates 12 and 16 constituting the color filter substrate 11 and the thin film transistor substrate 15 are substrates made of a brittle material having a relatively high Young's modulus, and are not easily deformed greatly due to stress. Therefore, the color filter substrate 11 is locally bent when the liquid crystal display panel 10 is deformed in a curved shape as compared with the case where each substrate constituting the color filter substrate and the thin film transistor substrate is a plastic substrate or the like. Can be further suppressed.

  The difference in thickness d1, d2 between the glass substrate 12 constituting the color filter substrate 11 and the glass substrate 16 constituting the thin film transistor substrate 15 is 0.1 mm or more, and the thickness d3 of the liquid crystal display panel 10 is 0. Since it is .6 mm or less, the color filter substrate 11 can be sufficiently suppressed from being locally bent and the thin film transistor substrate 15 can be satisfactorily suppressed from cracking.

<< Other Embodiments >>
In the first embodiment, the liquid crystal display panel 10 has a concave curved display surface D. However, the present invention is not limited to this, and the liquid crystal display panel has a convex curved display surface. It may be. That is, in the liquid crystal display panel, the color filter substrate may be disposed on the convex surface side, and the thin film transistor substrate may be disposed on the concave surface side. Thus, when the display surface of the liquid crystal display panel is a convex display surface, in the liquid crystal display panel, the glass substrate constituting the concave thin film transistor substrate constitutes the glass constituting the convex color filter substrate. If it is thicker than the substrate, the same effect as in the first embodiment can be obtained.

  In the first embodiment, the color filter substrate 11 and the thin film transistor substrate 15 are configured by providing the pixel components 13 and 17 on the glass substrates 12 and 16, respectively. However, the present invention is not limited thereto. The color filter substrate 11 and the thin film transistor substrate 15 may be configured by providing pixel components 13 and 17 on the surface of a flexible plastic substrate. Even in such a configuration, in the liquid crystal display panel 10, if the plastic substrate constituting the concave color filter substrate 11 is thicker than the plastic substrate constituting the convex thin film transistor substrate 15, the color filter It is possible to suppress the substrate 11 from being locally bent.

  In Embodiment 1, the difference between the thicknesses d1 and d2 of the glass substrate 12 constituting the color filter substrate 11 and the glass substrate 16 constituting the thin film transistor substrate 15 is 0.1 mm or more, and the liquid crystal display Although it has been described that the thickness d3 of the panel 10 is preferably 0.6 mm or less, the present invention is not limited to this, and the glass substrate 12 that constitutes the color filter substrate 11 and the glass that constitutes the thin film transistor substrate 15. The difference between the thicknesses d1 and d2 with the substrate 16 may be less than 0.1 mm, and the thickness d3 of the liquid crystal display panel 10 may be greater than 0.6 mm.

  Further, in the first embodiment, the liquid crystal display device S that performs color display in which the color filter substrate 11 and the thin film transistor substrate 15 are bonded to each other has been described. However, the present invention is not limited thereto, and the liquid crystal display device that performs monochrome display, The present invention can also be applied to other display devices in which a pair of substrates such as an organic electroluminescence display device are bonded to each other.

  As described above, the present invention is useful for a display device, and in particular for a display device that is desired to suppress local bending of a concave-side substrate in a curved display panel. Is suitable.

1 is a plan view schematically showing a liquid crystal display device of Embodiment 1. FIG. It is a figure which shows schematically the II-II sectional view taken on the line of FIG. It is sectional drawing which shows schematically the liquid crystal display panel before making it deform | transform into the curved shape in the conventional liquid crystal display device. It is sectional drawing which shows schematically the liquid crystal display panel after making it deform | transform into the curved shape in the conventional liquid crystal display device.

Explanation of symbols

S Liquid crystal display device d1 Thickness d2 of glass substrate constituting color filter substrate Thickness d3 of glass substrate constituting thin film transistor substrate Thickness 10 of liquid crystal display panel Liquid crystal display panel 11 Color filter substrate (first substrate)
12 Glass substrate constituting color filter substrate 15 Thin film transistor substrate (second substrate)
16 Glass substrate constituting thin film transistor substrate 20 Liquid crystal layer

Claims (4)

Comprising a display panel bonded so that the first substrate and the second substrate face each other;
The display panel is deformed into a curved shape, the first substrate is disposed on the concave side, and the second substrate is disposed on the convex side,
The display device, wherein the substrate constituting the first substrate is thicker than the substrate constituting the second substrate. The display device according to claim 1,
Each of the substrates constituting the first substrate and the second substrate is a glass substrate, respectively. The display device according to claim 2,
The difference in thickness between the substrate constituting the first substrate and the substrate constituting the second substrate is 0.1 mm or more, and the thickness of the display panel is 0.6 mm or less. Display device. The display device according to claim 1,
The display panel includes a liquid crystal layer provided between the first substrate and the second substrate.

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