JP2009258324A - Display panel, manufacturing method, and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent breakage of a curved surface-like display panel by suppressing development of cracks on a brittle substrate. <P>SOLUTION: The display panel 30a comprises a brittle first substrate 10; a second substrate 20 disposed so as to face the first substrate 10, and a display medium layer 15, provided between the first substrate 10 and the second substrate 20. The first substrate 10 and the second substrate 20 are curved so that the first substrate 10 is turned outwardly, and a crack development suppressing film 21a is provided on each end surface of the substrate 10, and suppress the penetration of moisture to a crack formed at the end surface of the substrate 10 for suppressing the development of the crack. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display panel, a manufacturing method thereof, and an electronic device, and more particularly to a curved display panel using a brittle substrate, a manufacturing method thereof, and an electronic device.

  The liquid crystal display panel includes, for example, a thin film transistor (hereinafter referred to as “TFT”) array substrate, a color filter substrate disposed facing the TFT array substrate, and a liquid crystal layer provided between the two substrates. Yes.

  For example, in Patent Document 1, UV resin having moisture-proof, moisture-proof, and insulating characteristics is applied to the substrate end surfaces of the array substrate and the color filter substrate so as to fill a gap between the two substrates, and thereafter A method of manufacturing a liquid crystal display panel in which a resin is cured by UV irradiation to form a protective coating layer is disclosed. According to this, electric field corrosion of the wiring pattern due to intrusion of moisture and impurities from the substrate end surface can be prevented, and reliability when using the liquid crystal display panel can be improved, and static electricity from the substrate end surface generated in the manufacturing process can be improved. It is described that display abnormality of the liquid crystal display panel due to element destruction or insulation film destruction can be reduced.

  By the way, since the liquid crystal display panel has an advantage of being thin and light, it has been widely used than before, but further reduction in thickness and weight has been demanded.

For example, in Patent Document 2, a pair of glass substrates having an area corresponding to a plurality of liquid crystal display elements, a sealing material surrounding each liquid crystal sealing region of each element section, and an outer peripheral sealing material surrounding all of each element section are provided. After assembling the element assembly through bonding, the outer surface of one of the two substrates of each element section is etched to reduce the thickness of the substrate, and then the liquid crystal that separates the element assembly into individual elements A method for manufacturing a display element is disclosed. And according to this, since the liquid crystal display element in which the thickness of one of the substrates is reduced can be efficiently manufactured, and since the thickness of the substrate is reduced by etching the outer surface of the substrate, the substrate It is described that the liquid crystal display element can be manufactured with high yield because the substrate can be uniformly thinned and the substrate is not damaged.
Japanese Patent Laid-Open No. 10-187054 JP-A-5-249422

  In recent years, in a display device using a liquid crystal display panel, a novel design in which the display surface of the liquid crystal display panel is curved has attracted attention, particularly in mobile applications such as a mobile phone.

  The curved liquid crystal display panel with a curved display surface is made thin by etching the glass substrate that constitutes the panel itself, and a bending stress is applied to the thin panel itself. This can be realized by maintaining the curved shape.

  Here, in a curved liquid crystal display panel using a glass substrate, the bending stress generated in the glass substrate is determined by the curvature of the glass substrate and the thickness of the glass substrate when the glass substrate is bent. If the glass substrate is bent with a curvature that generates a large bending stress, the glass substrate may be broken and the liquid crystal display panel may be damaged. In order to suppress the breakage of the liquid crystal display panel, it is conceivable to further reduce the bending stress generated in the glass substrate by further thinning the glass substrate.

  However, even if the glass substrate can be further reduced in thickness by suppressing the damage of the liquid crystal display panel, if the glass substrate having brittleness is held in a curved state for a long time, the glass substrate is broken when the glass substrate is divided. When the minute crack formed on the end face grows, the glass substrate may break, and the liquid crystal display panel may be damaged.

  The present invention has been made in view of this point, and an object of the present invention is to suppress the growth of cracks in a brittle substrate and to suppress the breakage of a curved display panel.

  In order to achieve the above object, according to the present invention, a crack growth inhibiting film is provided on an end face of a brittle first substrate.

  Specifically, a display panel according to the present invention includes a brittle first substrate, a second substrate disposed to face the first substrate, and a display provided between the first substrate and the second substrate. A display panel comprising a medium layer, wherein the first substrate and the second substrate are curved so that the first substrate faces outward, and the end surface of the first substrate has the first substrate The present invention is characterized in that a crack growth suppression film is provided for suppressing the penetration of moisture into the crack formed on the end face of the substrate and suppressing the growth of the crack.

  According to the above configuration, since the first substrate and the second substrate are curved so that the first substrate faces outward, a tensile stress is always applied to the first substrate. Here, on the end face of the brittle first substrate, there are minute cracks formed when, for example, a large mother substrate is divided in order to produce the first substrate. The cracks formed on the end surface of the first substrate may grow from the end surface of the substrate into the substrate surface due to the presence of moisture in the atmosphere with a tensile stress applied to the surrounding substrate itself. However, since the crack growth suppression film is provided on the end surface of the first substrate, contact with moisture in the atmosphere is suppressed, and growth from the substrate end surface into the substrate surface is suppressed. Thereby, since the breakage of the brittle first substrate and the curved display panel including the same is suppressed, the growth of cracks in the brittle substrate can be suppressed, and the breakage of the curved display panel can be suppressed. It becomes possible.

  The crack growth suppression film may be provided also on the outer surface of the first substrate.

  According to the above configuration, even when a minute crack is formed on the outer surface of the first substrate when the large mother substrate is divided, the crack growth suppression film is also provided on the outer surface of the first substrate. Therefore, it is possible to suppress the growth of cracks on the outer surface due to the presence of moisture in the atmosphere in contact with the outer surface of the first substrate, and to suppress the damage to the curved display panel.

  The second substrate has brittleness, and the end surface of the second substrate suppresses the penetration of moisture into the crack formed on the end surface of the second substrate, thereby suppressing the growth of the crack. A crack growth inhibiting film may be provided.

  According to said structure, since the 1st board | substrate and the 2nd board | substrate are curving so that a 1st board | substrate may face outward, the tension | tensile_strength currently loaded on the 1st board | substrate is carried out to the inner surface side of a 2nd board | substrate. Although it is weaker than the stress, a slight tensile stress is always applied. Here, on the end face of the second substrate having brittleness, for example, there are minute cracks formed when a large mother substrate is divided in order to produce the second substrate. The crack formed on the end surface of the second substrate may grow from the end surface of the substrate into the substrate surface due to the presence of moisture in the atmosphere in a state where tensile stress is applied to the surrounding substrate itself. However, since the crack growth suppression film is provided on the end surface of the second substrate, contact with moisture in the atmosphere is suppressed, and growth from the substrate end surface into the substrate surface is suppressed. Thereby, the breakage of the first substrate and the second substrate each having brittleness, and the curved display panel including them are suppressed.

  The crack growth suppression film may be made of resin.

  According to the above configuration, since the crack growth suppressing film is made of resin, for example, if a resin material is applied to the end surface of the first substrate and the applied resin film is cured, the crack growth suppressing film is formed. Easy to form.

  The first substrate and the second substrate may be made of glass, and the display medium layer may be a liquid crystal layer.

  According to the above configuration, since the first substrate and the second substrate are made of glass and the display medium layer is a liquid crystal layer, a liquid crystal display panel in which a liquid crystal layer is sealed between a pair of glass substrates is specifically described. Composed.

  Further, the method for manufacturing a display panel according to the present invention includes bonding the first substrate and the second substrate having brittleness so as to enclose the display medium layer between the first substrate and the second substrate, A bonded body manufacturing process for manufacturing a bonded body, a moisture removing process for removing at least a part of moisture contained in the first substrate, and at least a part of the water were removed by heating the bonded body. A crack growth inhibiting film forming step of forming a crack growth inhibiting film for inhibiting the penetration of moisture into the cracks formed on the end face of the first substrate and suppressing the growth of the cracks on the end face of the first substrate. And a deformation step of deforming the first substrate and the second substrate on which the crack growth suppressing film is formed into a curved shape so that the first substrate faces outward.

  According to said method, after removing at least one part of the water | moisture content contained in the bonding body produced at the bonding body preparation process in a moisture removal process, in the crack growth suppression film | membrane formation process, it has the brittleness of the bonding body. Since the crack growth suppressing film is formed on the end face of one substrate, it is possible to suppress contact of moisture in the atmosphere with the end face of the first substrate in the subsequent deformation process. In the deforming step, the first substrate and the second substrate are curved so that the first substrate faces outward, so that a tensile stress is always applied to the first substrate. Here, on the end face of the brittle first substrate, for example, a minute crack formed when the large-sized mother substrate is divided before or after the bonded body production step in order to produce the first substrate. Is present. The cracks formed on the end surface of the first substrate may grow from the end surface of the substrate into the substrate surface due to the presence of moisture in the atmosphere with a tensile stress applied to the surrounding substrate itself. Although there is a crack growth suppression film formed on the end surface of the first substrate in the crack growth suppression film formation step, contact with moisture in the atmosphere is suppressed and growth from the substrate end surface to the substrate surface is suppressed. Is done. Thereby, since the breakage of the brittle first substrate and the curved display panel including the same is suppressed, the growth of cracks in the brittle substrate can be suppressed, and the breakage of the curved display panel can be suppressed. It becomes possible.

  The electronic device according to the present invention is an electronic device including a curved display panel, and the display panel includes a brittle first substrate and a second substrate disposed to face the first substrate. A substrate and a display medium layer provided between the first substrate and the second substrate, wherein the first substrate and the second substrate are curved so that the first substrate faces outward, The end surface of the first substrate is provided with a crack growth suppression film for suppressing the penetration of moisture into the crack formed on the end surface of the first substrate and suppressing the growth of the crack. Features.

  According to the above configuration, in the display panel, since the first substrate and the second substrate are curved so that the first substrate faces outward, a tensile stress is always applied to the first substrate. Here, on the end face of the brittle first substrate, there are minute cracks formed when, for example, a large mother substrate is divided in order to produce the first substrate. The cracks formed on the end surface of the first substrate may grow from the end surface of the substrate into the substrate surface due to the presence of moisture in the atmosphere with a tensile stress applied to the surrounding substrate itself. However, since the crack growth suppression film is provided on the end surface of the first substrate, contact with moisture in the atmosphere is suppressed, and growth from the substrate end surface into the substrate surface is suppressed. This suppresses breakage of the brittle first substrate and the curved display panel including the first substrate. Therefore, in the electronic device, the growth of the crack in the brittle substrate is suppressed, and the curved display panel is damaged. It becomes possible to suppress.

  According to the present invention, since the crack growth suppression film is provided on the end face of the brittle first substrate, it is possible to suppress the growth of cracks in the brittle substrate and to suppress the breakage of the curved display panel. .

  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 to 10 show Embodiment 1 of a display panel, a manufacturing method thereof, and an electronic device according to the present invention.

  FIG. 1 is a cross-sectional view of the liquid crystal display panel 30a of the present embodiment, and FIG. 2 is a side view of the liquid crystal display panel 30a. 3 is a perspective view of the mobile phone 50 including the liquid crystal display panel 30a, FIG. 4 is a front view of the mobile phone 50, and FIG. 5 is a side view of the mobile phone 50.

  As shown in FIGS. 1 and 2, the liquid crystal display panel 30a includes a TFT array substrate 10 provided as a brittle first substrate, and a TFT array substrate 10 that is disposed to face the TFT array substrate 10 and serves as a brittle second substrate. The color filter substrate 20 provided, the liquid crystal layer 15 provided as a display medium layer between the TFT array substrate 10 and the color filter substrate 20, the TFT array substrate 10 and the color filter substrate 20 are adhered to each other, and their A sealing material 16 for enclosing the liquid crystal layer 15 is provided between both the substrates 10 and 20, and the TFT array substrate 10 and the color filter substrate 20 are curved so that the TFT array substrate 10 faces outward. The size of the liquid crystal display panel 30a is, for example, type 2 (length 40 mm × width 55 mm, thickness 0.05 mm to 0.3 mm × 2), and the radius of curvature is 50 mm to 400 mm.

  The TFT array substrate 10 has a plurality of gate lines (not shown) provided so as to extend in parallel to each other on a brittle substrate such as a glass substrate and so as to extend in parallel to each other in a direction orthogonal to each gate line. A plurality of source lines (not shown) provided on each gate, a plurality of TFTs (not shown) provided at each gate line and each intersection of the source lines, and interlayer insulation provided so as to cover each TFT The TFT array layer 11 includes a film (not shown) and a plurality of pixel electrodes (not shown) provided in a matrix on the interlayer insulating film and connected to each TFT. An alignment film (not shown) is provided on the surface of the TFT array layer 11. Here, each pixel electrode constitutes a pixel, which is the minimum unit of an image, and constitutes a display area for displaying an image as a whole by arranging in a matrix, that is, a display screen D in FIGS. ing.

  The end face of the TFT array substrate 10 is provided with a crack growth suppression film 21a for suppressing the penetration of moisture into the crack C (see FIG. 6) formed on the end face and suppressing the growth of the crack C. Yes.

  As shown in FIGS. 1 and 2, the TFT array substrate 10 is provided with a plurality of connection terminals for connecting to the gate lines and the source lines, as shown in FIGS. A region T is provided.

  The color filter substrate 20 is, for example, a color filter layer (not shown) having a red layer (R), a green layer (G) and a blue layer (B) provided on a brittle substrate such as a glass substrate, and black. It has a matrix and a common electrode (not shown) provided so as to cover the color filter layer and the black matrix. An alignment film (not shown) is provided on the surface of the common electrode.

  The liquid crystal display panel 30a having the above configuration configures the liquid crystal layer 15 by applying a predetermined voltage to the liquid crystal layer 15 disposed between each pixel electrode on the TFT array substrate 10 and the common electrode on the color filter substrate 20. By changing the alignment state of the liquid crystal molecules, the transmittance of the light transmitted through the panel is adjusted for each pixel to display an image.

  Further, as shown in FIGS. 3 to 5, the liquid crystal display panel 30 a is attached to a frame-like bezel (not shown) accommodated in the curved first casing 41, thereby forming a curved shape. And the display screen D of the mobile phone 50 is configured. Here, the mobile phone 50 includes a first casing 41 having a liquid crystal display panel 30a and a second casing 42 having various operation buttons and the like. It is configured to be slid and housed inside the two housings 42.

  Next, a method for manufacturing the liquid crystal display panel 30a will be described with reference to FIGS. In addition, the manufacturing method of this embodiment is equipped with the bonding body preparation process, a parting process, a water | moisture-content removal process, a crack growth suppression film | membrane formation process, and a deformation | transformation process.

<Bonded body production process>
First, for example, a TFT array layer 11 including a gate line, a source line, a TFT, and a pixel electrode is formed on a glass substrate having a thickness of about 0.7 mm by using a well-known method. A TFT array mother substrate (110, see FIG. 6) in which a plurality of display areas having 11 are arranged in a matrix is manufactured. On the TFT array mother substrate (110), a polyimide resin film is formed so as to cover each TFT array layer 11, and then an alignment film is formed by performing a rubbing process. Here, FIG. 6 is a cross-sectional view of the large-sized bonded body 130 manufactured in the bonded body manufacturing process.

  In addition, for example, a plurality of display regions are arranged in a matrix by forming a black matrix, a color filter layer, a common electrode, and the like on a glass substrate having a thickness of about 0.7 mm using a known method. A color filter mother substrate (120, see FIG. 6) is prepared. On the color filter mother substrate (120), a polyimide resin film is formed so as to cover each common electrode, and then an alignment film is formed by performing a rubbing process.

  Subsequently, for example, using a dispenser, the sealing material 16 is drawn in a frame shape around each display region on the color filter mother substrate (120).

  Thereafter, a liquid crystal material is dropped onto a region (display region) surrounded by the sealing material 16 with respect to the color filter mother substrate (120) on which the sealing material 16 is drawn.

  Further, the color filter mother substrate (120) on which the liquid crystal material is dropped and the TFT array mother substrate (110) are bonded to each other so that the display regions D overlap each other under reduced pressure, and then released to atmospheric pressure. Then, the outer surfaces of the TFT array mother substrate (110) and the color filter mother substrate (120) are pressurized to produce a large bonded body (130, see FIG. 6).

  Subsequently, after each sealing material 16 sandwiched between the bonded bodies (130) is cured, each glass substrate constituting the TFT array mother substrate (110) and the color filter mother substrate (120) is subjected to chemical polishing treatment (chemical Etching process), for example, by reducing the thickness to about 0.05 mm to 0.3 mm, respectively, as shown in FIG. 6, the TFT array mother substrate 110 and the color filter mother substrate 120 are provided, and each display region is provided. The liquid crystal layer 15 is sealed with a sealing material 16 to produce a large-sized bonded body 130.

<Division process>
First, on the outer surface of the TFT array mother substrate 110 of the bonded body 130a manufactured in the bonded body manufacturing step, along the periphery of each display region, for example, while contacting the cutting edge of a disk-shaped cutting blade, By rolling the dividing blade, a linear crack C is formed, and the crack C is grown in the thickness direction, whereby the TFT array mother substrate 110 is divided, and the TFT array substrate 10 (see FIG. 6). ). Here, the cutting edge of the cutting blade is made of, for example, cemented carbide such as tungsten carbide, sintered diamond, or the like.

  Subsequently, after reversing the bonded body 130 from which the TFT array mother substrate 110 has been divided, the outer surface of the color filter mother substrate 120 is applied with, for example, the cutting edge of the dividing blade along the periphery of each display region. By rolling the cutting blade while contacting, a linear crack is formed, and the crack C is grown in the thickness direction, whereby the color filter mother substrate 120 is cut and the color filter substrate 20 is cut. (See FIG. 6). As a result, as shown in FIG. 6, a liquid crystal display panel 30 (bonded body) including the TFT array substrate 10 and the color filter substrate 20 and having the liquid crystal layer 15 sealed with the sealing material 16 is manufactured.

<Moisture removal process>
First, as shown in FIG. 7, after the liquid crystal display panel 30 produced in the above dividing step is accommodated in the processing chamber C, the liquid crystal display panel 30 is heated to about 120 ° C. by the heater H, and the inside of the processing chamber C is evacuated by the vacuum pump P. By deaeration, moisture contained in the liquid crystal display panel 30, particularly moisture adhering to the end faces of the TFT array substrate 10 and the color filter substrate 20 is sufficiently removed. Here, FIG. 7 is a cross-sectional view of the liquid crystal display panel 30 in the moisture removing step.

  Thereafter, while the inside of the processing chamber C is kept in a vacuum state and gradually cooled to about room temperature, an inert gas such as a noble gas or nitrogen containing no moisture is supplied to the inside of the processing chamber C. The inside of the processing chamber C is returned to atmospheric pressure.

<Crack growth suppression film formation process>
In the processing chamber C, the liquid crystal display panel 30 from which moisture has been sufficiently removed in the moisture removal step is dipped with Teflon (registered trademark) resin or polycarbonate resin on the end surface of the TFT array substrate 10. After being supplied by brushing or the like, the supplied resin film is cured by heating, UV irradiation or the like, thereby forming a crack growth inhibiting film 21a (for example, about 2 μm in thickness) as shown in FIGS. Form. 8 is a cross-sectional view of the liquid crystal display panel 30 in which the crack growth suppression film 21a is formed in the crack growth suppression film formation step, and FIG. 9 is a side view of the liquid crystal display panel 30. These are other sectional views of the liquid crystal display panel 30. FIG. 8 is a cross-sectional view taken along the length direction of the liquid crystal display panel 30, and FIG. 10 is a cross-sectional view taken along the width direction of the liquid crystal display panel 30.

<Deformation process>
As shown in FIGS. 1 and 2, the planar liquid crystal display panel 30 in which the crack growth suppressing film 21a is formed on the substrate end face in the crack growth suppressing film forming step is arranged so that the TFT array substrate 10 side faces outward. For example, the curved liquid crystal display panel 30a is manufactured by being attached to a frame-like bezel (not shown) via an adhesive layer such as a double-sided tape while being deformed into a curved shape. Here, the bezel has, for example, a concave surface whose longitudinal section is formed in an arc shape, and the concave surface is configured to open in a rectangular shape in a portion overlapping the display area of the liquid crystal display panel 30a. Yes.

  As described above, the liquid crystal display panel 30a of this embodiment can be manufactured.

  As explained above, according to the liquid crystal display panel 30a of this embodiment, the manufacturing method thereof, and the mobile phone 50, in the moisture removal step, the water contained in the bonded body 130 manufactured in the bonded body manufacturing step is sufficiently contained. After the removal, in the crack growth suppressing film forming step, the crack growth suppressing film 21a is formed on the end surface of the TFT array substrate 10 having brittleness in the bonded body 130. Therefore, in the subsequent deformation step, the end surface of the TFT array substrate 10 is exposed to the atmosphere. It is suppressed that the water | moisture content inside contacts. In the deformation process, since the TFT array substrate 10 and the color filter substrate 20 are curved so that the TFT array substrate 10 faces outward, a tensile stress is always applied to the outer TFT array substrate 10. become. Here, on the end face of the TFT array substrate 10 having brittleness, a minute crack C formed when the large-sized TFT array mother substrate 110 is divided after the bonding body production process in order to produce the TFT array substrate 10. Is present. The crack C on the end surface of the TFT array substrate 10 may grow from the end surface of the substrate into the substrate surface due to the presence of moisture in the atmosphere with tensile stress applied to the surrounding substrate itself. However, since the crack growth suppression film 21a is formed on the end surface of the TFT array substrate 10 in the crack growth suppression film formation step, contact with moisture in the atmosphere is suppressed, and growth from the substrate end surface into the substrate surface may occur. It is suppressed. As a result, the TFT array substrate 10 having brittleness and the curved liquid crystal display panel 30a including the TFT array substrate 10 can be prevented from being damaged. Damage can be suppressed.

<< Embodiment 2 of the Invention >>
11 is a cross-sectional view of the liquid crystal display panel 30b of the present embodiment, FIG. 12 is a side view of the liquid crystal display panel 30b, and FIG. 13 is another cross-sectional view of the liquid crystal display panel 30b. In addition, in each following embodiment, the same code | symbol is attached | subjected about the same part as FIGS. 1-10, and the detailed description is abbreviate | omitted.

  In the liquid crystal display panel 30a of the first embodiment, the crack growth suppressing film 21a is provided only on the end surface of the TFT array substrate 10. However, in the liquid crystal display panel 30b of the present embodiment, as shown in FIGS. The crack growth inhibiting film 21b is provided so as to cover the end face and the outer surface of the TFT array substrate 10.

  According to the liquid crystal display panel 30b of the present embodiment, the crack growth suppressing film 21a is provided not only on the end surface of the TFT array substrate 10 but also on the outer surface. The growth of cracks on the outer surface of the TFT array substrate 10 due to the presence of moisture is suppressed, and damage to the curved display panel can be suppressed as compared with the liquid crystal display panel 30a of the first embodiment.

<< Embodiment 3 of the Invention >>
14 is a cross-sectional view of the liquid crystal display panel 30c of the present embodiment, FIG. 15 is a side view of the liquid crystal display panel 30c, and FIG. 16 is another cross-sectional view of the liquid crystal display panel 30c.

  In the liquid crystal display panel 30a of the first embodiment, the crack growth suppressing film 21a is provided only on the end face of the TFT array substrate 10. However, in the liquid crystal display panel 30c of the present embodiment, as shown in FIGS. The crack growth suppressing film 21 c is provided so as to cover the end faces of the TFT array substrate 10 and the color filter substrate 20.

  According to the liquid crystal display panel 30c of the present embodiment, as in the first embodiment, the growth of cracks in the TFT array substrate 10 can be suppressed, and the crack growth suppression film 21c is formed only on the end surface of the TFT array substrate 10. Since it is also provided on the end surface of the color filter substrate 20, even when a slight tensile stress is always applied to the inner surface side of the color filter substrate 20, cracks C on the end surface of the color filter substrate 20 and the atmosphere Contact with moisture therein is suppressed, and cracks C on the end surface of the color filter substrate 20 are suppressed from growing from the substrate end surface into the substrate surface. Thereby, since the damage in the TFT array substrate 10 and the color filter substrate 20 each having brittleness, and the curved liquid crystal display panel 30c including them can be suppressed, the growth of cracks in the brittle substrate is suppressed, Damage to the curved display panel can be suppressed.

<< Embodiment 4 of the Invention >>
17 is a cross-sectional view of the liquid crystal display panel 30d of the present embodiment, FIG. 18 is a side view of the liquid crystal display panel 30d, and FIG. 19 is another cross-sectional view of the liquid crystal display panel 30d.

  In the liquid crystal display panel 30c of the third embodiment, the crack growth suppressing film 21c is provided so as to cover the end faces of the TFT array substrate 10 and the color filter substrate 20. However, in the liquid crystal display panel 30d of the present embodiment, FIG. As shown in FIGS. 17 to 19, a crack growth suppressing film 21 d is provided so as to cover the end surfaces of the TFT array substrate 10 and the color filter substrate 20 and the outer surface of the TFT array substrate 10.

  According to the liquid crystal display panel 30d of the present embodiment, the crack growth suppressing film 21d is provided not only on the respective end faces of the TFT array substrate 10 and the color filter substrate 20, but also on the outer surface of the TFT array substrate 10. Growth of cracks on the outer surface of the TFT array substrate 10 due to the presence of atmospheric moisture in contact with the outer surface of the substrate 10 is suppressed, and the curved display panel is more damaged than the liquid crystal display panel 30c of the third embodiment. Can be suppressed.

  In each of the above embodiments, a case where a crack growth suppression film is provided at least on the end surface on the TFT array substrate 10 side and is deformed in a curved shape so that the TFT array substrate 10 side faces outward is illustrated. The present invention can also be applied to a case where the color filter substrate side is deformed in a curved shape so as to face outward. If the color filter substrate is deformed in a curved shape so that it faces outward, a tensile stress is applied to the color filter substrate, so that it is brittle by providing a crack growth suppression film on the end surface of the color filter substrate. The growth of cracks in the substrate can be suppressed, and damage to the curved display panel can be suppressed.

  In the above embodiments, the liquid crystal display panels 30a to 30d are exemplified as the display panels. However, the present invention can also be applied to other display panels such as an organic EL (Electro Luminescence) display panel.

  In each of the above embodiments, the color filter substrate is manufactured using a glass substrate having brittleness, but may be manufactured using a plastic film substrate having no brittleness. That is, in the present invention, it is only necessary that at least the outer substrate on which the tensile stress is applied has brittleness when the display panel is deformed into a curved shape.

  In each said embodiment, although the glass substrate was illustrated as a brittle board | substrate, this invention is applicable also to brittle board | substrates, such as a ceramic substrate and a silicon substrate.

  As described above, the present invention can suppress the breakage of a display panel using a brittle substrate, and thus is useful for a curved display panel using a brittle substrate and a display panel that can be deformed into a curved shape. .

3 is a cross-sectional view of a liquid crystal display panel 30a according to Embodiment 1. FIG. It is a side view of the liquid crystal display panel 30a. It is a perspective view of the mobile telephone 50 provided with the liquid crystal display panel 30a. 2 is a front view of a mobile phone 50. FIG. 2 is a side view of a mobile phone 50. FIG. It is sectional drawing of the large-sized bonding body 130 produced at the bonding body preparation process for manufacturing the liquid crystal display panel 30a. It is sectional drawing of the liquid crystal display panel 30 in the water | moisture-content removal process for manufacturing the liquid crystal display panel 30a. It is sectional drawing of the liquid crystal display panel 30 in which the crack growth suppression film | membrane 21a was formed in the crack growth suppression film formation process for manufacturing the liquid crystal display panel 30a. It is a side view of the liquid crystal display panel 30 in which the crack growth suppression film | membrane 21a was formed. 6 is another cross-sectional view of the liquid crystal display panel 30 on which a crack growth inhibiting film 21a is formed. FIG. It is sectional drawing of the liquid crystal display panel 30b which concerns on Embodiment 2. FIG. It is a side view of the liquid crystal display panel 30b. It is other sectional drawing of the liquid crystal display panel 30b. It is sectional drawing of the liquid crystal display panel 30c which concerns on Embodiment 3. FIG. It is a side view of the liquid crystal display panel 30c. It is another sectional view of liquid crystal display panel 30c. It is sectional drawing of the liquid crystal display panel 30d which concerns on Embodiment 4. FIG. It is a side view of the liquid crystal display panel 30d. It is another sectional view of liquid crystal display panel 30d.

Explanation of symbols

C crack 10 TFT array substrate (first substrate)
15 Liquid crystal layer (display medium layer)
20 Color filter substrate (second substrate)
21a-21d Crack growth suppression film 30 Liquid crystal display panel (bonded body)
30a-30d Liquid crystal display panel 50 Mobile phone (electronic equipment)

Claims (7)

A brittle first substrate;
A second substrate disposed opposite the first substrate;
A display panel comprising a display medium layer provided between the first substrate and the second substrate,
The first substrate and the second substrate are curved so that the first substrate faces outward,
The end surface of the first substrate is provided with a crack growth suppression film for suppressing the penetration of moisture into the crack formed on the end surface of the first substrate and suppressing the growth of the crack. Characteristic display panel. The display panel according to claim 1,
The display panel, wherein the crack growth suppressing film is also provided on an outer surface of the first substrate. The display panel according to claim 1,
The second substrate has brittleness,
The end surface of the second substrate is provided with a crack growth suppression film for suppressing the penetration of moisture into the crack formed on the end surface of the second substrate and suppressing the growth of the crack. Characteristic display panel. The display panel according to claim 1,
The display panel, wherein the crack growth suppression film is made of resin. The display panel according to claim 3,
The first substrate and the second substrate are made of glass,
The display panel, wherein the display medium layer is a liquid crystal layer. A bonded body manufacturing step of manufacturing a bonded body by bonding the brittle first substrate and the second substrate so as to enclose the display medium layer between the first substrate and the second substrate;
A moisture removal step of removing at least part of the moisture contained in the first substrate by heating the bonded body;
Crack growth suppression for suppressing the crack growth by suppressing the penetration of moisture into the crack formed on the end surface of the first substrate on the end surface of the first substrate from which at least a part of the moisture has been removed. A crack growth inhibiting film forming step for forming a film;
A method of manufacturing a display panel, comprising: a deformation step of deforming the first substrate and the second substrate on which the crack growth suppression film is formed in a curved shape so that the first substrate faces outward. An electronic device having a curved display panel,
The display panel includes a brittle first substrate, a second substrate disposed to face the first substrate, and a display medium layer provided between the first substrate and the second substrate,
The first substrate and the second substrate are curved so that the first substrate faces outward,
The end surface of the first substrate is provided with a crack growth suppression film for suppressing the penetration of moisture into the crack formed on the end surface of the first substrate and suppressing the growth of the crack. Features electronic equipment.

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