JP6671536B2 - Bendable display substrate thin film, method of manufacturing the same, and display device - Google Patents

Description

  The present invention relates to a bendable display substrate thin film, a method for manufacturing the same, and a display device.

  In recent years, in response to demands for portable terminal display devices and televisions, liquid crystal display devices (LCD, Liquid Crystal Display), organic light emitting diode display devices (OLED, Organic Light-emitting Diode), and electronic paper display devices (E-paper, 2. Description of the Related Art Progress has been made in making display panels such as electronic paper thinner, lighter, and softer. At present, for the display of curved surfaces on large panels that require a sense of realism and portability, and the flexibility of portable terminal devices that require convenience and safety, a thin substrate film that combines flexibility and impact resistance is indispensable. Has become.

  A substrate widely used in flat panel displays in the prior art is a glass substrate, and the substrate can be bent by reducing the thickness of the substrate in order to impart flexibility to the glass substrate and realize a softened display. It is possible to have properties. When the thickness of the glass substrate is 0.1 mm or less, the glass substrate has the property of a bendable substrate thin film, that is, the glass thin film has some flexibility similar to a plastic thin film. However, the glass thin film still has a weak degree of bending and impact resistance, and the glass substrate thin film is easily broken in the manufacturing process of the display panel, and the display panel is always cracked in the use process, especially due to instantaneous excessive bending. The latent defects of the glass thin film occur, and there are severe problems such as cracks in the future processing and use processes. Therefore, research on using a plastic thin film having excellent impact resistance, light weight and excellent softness instead of a glass substrate thin film as a thin film for a display panel substrate is also an important research direction. However, if only a plastic thin film is used, it is difficult to avoid adverse effects on the display due to thermal deformation of the thin film, and requirements for the performance of the display panel to block oxygen and water vapor of the thin film (for example, oxygen barrier properties and water vapor barrier properties) Also not satisfied. Therefore, the usual method is to deposit a film layer made of an inorganic material on a plastic thin film, but such a film layer is expensive and not ideal, so that the cost of the display can be reduced and the life of the display panel can be reduced. And hinders the further widespread application of bendable display panels. In order to improve the performance of a plastic thin film for blocking oxygen and water vapor, Japanese Patent Application Laid-Open No. 2004-82598 discloses a laminate having a gas barrier property in which a metal oxide film and an organic material layer are laminated on a base material. Material was disclosed. This is one typical method, but in an organic electroluminescence display device that is required to have a performance of blocking oxygen and water vapor, the gas barrier properties of the laminate described in Patent Document 1 described above are not yet sufficient.

  Thereby, it is easy to think that a flexible film having excellent flexibility and good gas barrier properties can be obtained by laminating a plurality of layers, for example, an inorganic glass and a resin substrate disposed on both sides of the inorganic glass. Material layer, one of the resin base material layers, the inorganic thin film is arranged on the side where the inorganic glass is not arranged, and the inorganic thin film is a peripheral portion of at least one surface of the corresponding resin base material layer It is easy to imagine a method of forming it. However, such a laminated thin film still has defects, for example, because the impact resistance is insufficient if the glass thin film is too thin, and the flexibility is significantly reduced if the glass thin film is too thick. The problem exists. As described above, in the case of simply laminating a glass thin film and a plastic thin film or performing film coating, defects are likely to occur due to lack of flexibility and impact resistance of a bendable substrate thin film. Inability to solve the problem of strength.

JP-A-2004-82598

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and an object of the present invention is to provide a bendable display substrate thin film having excellent flexibility and gas barrier properties, a method for manufacturing the same, and a display device. is there.

The bendable display substrate thin film according to one embodiment of the present invention,
A glass thin film having a plurality of convex portions on the upper surface,
And a plastic thin film covering the glass thin film,
The plastic thin film has a concave portion on its lower surface for accommodating the plurality of convex portions.

  In the bendable display substrate thin film, the plurality of protrusions are arranged in a horizontal direction, a vertical direction, or a matrix on the upper surface of the glass thin film.

  Further, in the bendable display substrate thin film, when a plurality of protrusions are arranged in a horizontal direction or a vertical direction on an upper surface of the glass thin film, the protrusions are provided within a range having a predetermined distance from an edge of the glass thin film. When a plurality of projections are arranged in a matrix on the upper surface of the glass thin film, an edge projection is provided within a range having a predetermined distance from an edge of the glass thin film.

  Further, in the bendable display substrate thin film, when a plurality of convex portions are arranged in a horizontal direction or a vertical direction on an upper surface of the glass thin film, the convex portions are in a semi-cylindrical shape, a triangular prism shape, a quadrangular prism shape, a rectangular solid shape or When a plurality of convex portions are arranged in a matrix on the upper surface of the glass thin film, the convex portions have a quadrangular pyramid shape, a truncated quadrangular pyramid shape, a spherical crown shape, or a cubic shape.

  Further, in the bendable display substrate thin film, the plastic thin film includes a cover portion provided to face an upper surface of the glass thin film and an edge portion provided to face a side surface of the glass thin film.

Further, in the bendable display substrate thin film, the height of the protrusion of the convex portion and the depth of the concave portion of the concave portion are 100 μm or less, and the thickness of the portion other than the convex portion of the glass thin film is 100 μm or less. is there.
Further, in the bendable display substrate thin film, the bendable display substrate thin film includes an electrode disposed on a lower surface of the glass thin film and / or an upper surface of the plastic thin film,
A thin film transistor disposed on the lower surface of the glass thin film and / or the upper surface of the plastic thin film.

  Further, in the bendable display substrate thin film, the width of the edge portion is larger than 100 μm, the thickness of the portion other than the concave portion of the cover portion is 400 μm or less, and the surface undulation of the glass thin film is 0.5 μm / 20 mm. And the surface roughness of the plastic thin film is 2 nm or less.

A bendable display substrate thin film manufacturing method according to another aspect of the present invention is a manufacturing method used for manufacturing the bendable display substrate thin film described above,
Forming a glass thin film having a plurality of convex portions on the upper surface by a rolling method or an etching method,
Laser cutting the molded glass thin film to obtain a glass thin film of a required size,
Performing a cleaning and drying process on the glass thin film and the plastic thin film,
Coating a thin plastic film on a thin glass film;
In the laminating method, a step of integrally bonding the glass thin film and the plastic thin film, wherein a heating temperature when performing the laminating process is higher than the softening point temperature of the plastic thin film and lower than the softening point temperature of the glass thin film. , Steps,
Performing a laser cut on the plastic thin film integrally bonded with the glass thin film to obtain an edge having a required size.

  A display device according to still another aspect of the present invention includes the display substrate thin film according to any one of the above.

  In the above display device, the display device is a liquid crystal display device, an organic light emitting diode display device, or an electronic paper display device.

  Since the above embodiment is used, the bendable display substrate thin film, the method for manufacturing the same, and the display device provided by the present invention have a simple manufacturing process and excellent gas barrier properties. In order to avoid breakage and cracking of the glass thin film due to mechanical shock and thermal shock, the weight of the bendable display substrate thin film is reduced and the vibration is damped through the plastic thin film, which allows the display to be bent. The drop impact resistance and impact resistance of the substrate thin film have been significantly improved. In addition to providing a convex portion on the edge of the glass thin film, by coating with a plastic thin film, generation of edge defects was effectively avoided. By installing convex parts on the glass thin film and concave parts on the plastic thin film, it is possible to effectively avoid overbending defects, improve the thermal shock resistance and mechanical shock performance of the bendable display substrate thin film, The thin film can also serve to block water vapor and oxygen. When a plastic thin film is used as the inner surface, the protrusions and edge projections at the edge of the glass thin film are provided, so that the infiltration of oxygen and moisture from the edge of the plastic is reduced or cut off, and the display can be bent. The substrate thin film also has a gas barrier property similar to the glass substrate thin film.

  The present invention does not require a vacuum coating, so that a low-cost manufacturing of a bendable display device can be realized. Compared to a mere glass thin film, it is superior in flexibility and has display performance with the same life, and is particularly applicable to the manufacture of a long life organic electroluminescence display device. The convex portion of the glass thin film and the concave portion of the plastic thin film can suppress the thermal expansion of the plastic thin film having a high linear expansion coefficient, and use the glass thin film as a display reference plane to obtain a display substrate thin film having a low linear expansion coefficient. Can be. Generally, a glass thin film is ruptured and caused by the generation of minute defects on the surface due to stress concentration. The thinner the glass thin film is, the more easily the glass thin film is broken. Therefore, it is difficult to reduce the thickness of the glass thin film. In the display substrate thin film according to the present invention, by appropriately arranging convex portions having an appropriate shape and an appropriate density on the surface of the glass thin film, the impact resistance of the glass thin film itself is significantly improved, and the plastic thin film and The support projections attached to the surface can buffer external force impact, suppress stress in the direction of defect tearing during deformation, and obtain a flexible display substrate thin film with excellent flexibility. In addition, it can be adapted to the current manufacturing process, and has a low probability of occurrence of defects due to environmental temperature and deformation during processing of the display device and impact during transportation. According to the above description, in order to realize the gas barrier property of the display substrate thin film, a complicated thin film configuration is not required, and the defect of the glass thin film can be avoided, and the resistance to the environment of the manufacturing process is increased, Manufacturing cost is low.

FIG. 1 is a schematic diagram illustrating a configuration of a display substrate thin film according to the present invention. FIG. 1 is a schematic diagram illustrating a configuration of a display substrate thin film according to an embodiment of the present invention. FIG. 1 is a schematic diagram illustrating a configuration of a glass thin film according to an embodiment of the present invention. FIG. 1 is a schematic diagram illustrating a configuration of a display substrate thin film according to an embodiment of the present invention. FIG. 1 is a schematic diagram illustrating a configuration of a glass thin film according to an embodiment of the present invention. FIG. 1 is a schematic diagram illustrating a configuration of a glass thin film according to an embodiment of the present invention. FIG. 1 is a schematic diagram illustrating a configuration of a glass thin film according to an embodiment of the present invention. FIG. 1 is a schematic diagram illustrating a configuration of a display substrate thin film according to an embodiment of the present invention. FIG. 1 is a schematic diagram illustrating a configuration of a glass thin film according to an embodiment of the present invention. 4 is a flowchart of a manufacturing method according to the present invention.

  As shown in FIGS. 1, 2, 3, 4, 5, 6, 7, 8 and 9, a bendable display substrate thin film is a glass thin film having a plurality of convex portions 10 on the upper surface. 1 and a plastic thin film 2 covering the glass thin film 1. The plastic thin film 2 has a concave portion 20 for accommodating the plurality of convex portions 10 on a lower surface.

  The plurality of protrusions 10 are arranged on the upper surface of the glass thin film 1 in a horizontal direction, a vertical direction, or in a matrix. When the plurality of protrusions 10 are arranged on the upper surface of the glass thin film 1 in a horizontal direction or a vertical direction, the protrusions 10 are provided within a range having a predetermined distance from an edge of the glass thin film 1. Are arranged in a matrix on the upper surface of the glass thin film 1, an edge projection 11 is provided within a predetermined distance from the edge of the glass thin film 1.

  When the plurality of protrusions 10 are arranged on the upper surface of the glass thin film 1 in the horizontal direction or the vertical direction, the protrusions 10 have a semi-cylindrical shape, a triangular prism shape, a quadrangular prism shape, a rectangular parallelepiped shape, or a cubic shape. When the portions 10 are arranged in a matrix on the upper surface of the glass thin film 1, the protrusions 10 may have a quadrangular pyramid shape, a truncated quadrangular pyramid shape, a spherical crown shape or a cubic shape.

  The plastic thin film 2 has a cover portion 21 installed facing the upper surface of the glass thin film 1 and an edge portion 22 installed facing the side surface of the glass thin film 1. It is preferable that the height of the protrusion of the convex portion 10 and the depth of the concave portion of the concave portion 20 be 100 μm or less, and the thickness of the glass thin film 1 other than the convex portion 10 be 100 μm or less.

  The bendable display substrate thin film further includes electrodes disposed on the lower surface of the glass thin film 1 and / or the upper surface of the plastic thin film 2 and thin film transistors disposed on the lower surface of the glass thin film 1 and / or the upper surface of the plastic thin film 2. Preferably, the width of the edge portion 22 is larger than 100 μm, and the thickness of the portion other than the concave portion 20 of the cover portion 21 is 400 μm or less.

  The surface undulation of the glass thin film 1 is preferably 0.5 μm / 20 mm or less, and the surface roughness of the plastic thin film 2 is preferably 2 nm or less. FIG. 1 is a schematic diagram showing a configuration of a display substrate thin film according to the present invention. In FIG. 1, portions filled with different patterns indicate the concave portions 20 in the plastic thin film 2 and the convex portions 10 in the glass thin film 1, respectively.

The method for manufacturing a bendable display substrate thin film shown in FIG. 10 is a method used for manufacturing the bendable display substrate thin film described above,
Forming a glass thin film 1 having a plurality of convex portions 10 on the upper surface by a rolling method or an etching method;
Performing a laser cut on the molded glass thin film 1 to obtain a glass thin film 1 having required dimensions;
Cleaning and drying the glass thin film 1 and the plastic thin film 2;
Coating the plastic thin film 2 on the glass thin film 1;
A step of integrally bonding the glass thin film 1 and the plastic thin film 2 by a laminating method, in which a heating temperature during the laminating process is higher than a softening point temperature of the plastic thin film 2 and a softening of the glass thin film 1 A step below the point temperature,
Laser cutting the plastic thin film 2 integrally joined with the glass thin film 1 to obtain an edge portion 22 having a required size.

A display device, comprising the display substrate thin film described above.
The display device includes a liquid crystal display device, an organic light emitting diode display device, or an electronic paper display device.

  The bending performance of the bendable display substrate thin film of the present invention depends on the material of the glass thin film 1, the material of the plastic thin film 2, the thickness of the glass thin film 1, the thickness of the plastic thin film 2, the shape of the convex portion 10, and the shape of the convex portion 10. There is a direct relationship with any of the distribution densities. Specifically, as the thickness of the glass thin film 1 increases, it becomes difficult to bend and the weight increases as the thickness of the glass thin film 1 increases. Increasing the thickness of the thin film 1 is not necessary for improving gas barrier properties. This is because even if the thickness of the glass thin film 1 is 1 μm, it has a very high gas barrier capability. Increasing the distribution density of the protrusions 10 in the glass thin film 1 can increase the weight of the glass thin film 1 in the same manner as increasing the thickness of the glass thin film 1. Has minimal effect on gender.

  For the plastic thin film 2, increasing the thickness of the plastic thin film 2 increases the weight, but it is advantageous for improving the mechanical shock resistance of the glass thin film 1, and has a water vapor barrier property and an oxygen barrier property. Can be improved. Since the glass thin film 1 has sufficient gas barrier properties and water vapor barrier properties, the thickness of the plastic thin film 2 only needs to consider the characteristics of mechanical shock resistance. In addition, when the thickness of the plastic thin film 2 is increased, the transmittance of the display substrate is reduced, thereby offsetting the effort to reduce the thickness of the display device having the flexible display substrate thin film. As described above, in order to improve the water vapor barrier property and the gas barrier performance of the display substrate thin film, the demand can be reached even by using only the thin glass thin film 1, and with the thin glass thin film 1, Flexibility is also improved. However, if the glass thin film 1 and the plastic thin film 2 are simply laminated, it is difficult to avoid generation of dominant or inferior defects. Other than mechanical shock, thermal shock, difference in expansion coefficient between glass thin film 1 and plastic thin film 2, accumulation of stress in glass thin film 1, difference in elasticity between glass thin film 1 and plastic thin film 2 when bent, etc. Therefore, it is difficult to avoid the occurrence of the Re defect. By providing the convex portion 10 on the surface of the glass thin film 1, the thickness of the glass thin film 1 is partially increased, and when the glass thin film 1 is subjected to external force shock and thermal shock, it is similar to the thick glass thin film 1. Have strength. Since the convex portion 10 of the glass thin film 1 has a mosaic structure accommodated in the concave portion 20 of the plastic thin film 2, it is advantageous for reducing the shift caused by the difference in the expansion coefficient, and releases the stress of the glass thin film 1. This can prevent excessive accumulation of stress, compensate for the difference in elasticity between the glass thin film 1 and the plastic thin film 2 at the time of bending, and avoid generation of a peeling force.

  The protrusions 10 according to the present invention are arranged in a horizontal direction, a vertical direction, or a matrix on the upper surface of the glass thin film 1, and the protrusions 10 have a quadrangular pyramid shape, a truncated quadrangular pyramid shape, a spherical crown shape, a semi-cylindrical shape, It has a triangular prism shape, a quadrangular prism shape, a rectangular parallelepiped shape or a cubic shape. Hereinafter, a description will be given in relation to the influence of different configurations of the protrusions 10 on the flexibility of the display substrate thin film.

FIG. 2 is a schematic diagram illustrating a configuration of a display substrate thin film according to the embodiment of the present invention, and FIG. 3 is a schematic diagram illustrating a configuration of the glass thin film 1 according to the embodiment of the present invention. As shown in FIGS. 2 and 3, as a preferred embodiment, the convex portion 10 in the glass thin film 1 has a triangular prism shape, and preferably has a triangular prism shape having a vertical cross section of an isosceles triangle. On the upper surface of the glass thin film 1, they are arranged so as to be arranged in a horizontal direction. When assuming that the thickness of the portion other than the convex portion 10 of the glass thin film 1 is t _g , the thickness of the portion of the plastic thin film 2 other than the concave portion 20 is t _p , and the height of the convex portion 10 and the depth of the concave portion 20 are h. , the total thickness of the display substrate film is _{t = t g + t p +} h. At a center-to-center distance is W between the protrusions 10 adjacent in the maximum width W _g of the projections 10, the plastics film 2, the maximum width of the support projections 23 between adjacent recesses 20 in W _p, convex radius of curvature of the section 10 is R _g, the curvature of the support projections 23 between adjacent recesses 20 with a radius of R _p. In the usual case, the radius of curvature of the bendable display substrate films greater than the radius of curvature of the plastics film 2, that is, R ≧ R _p. The display substrate thin film of the present invention has flexibility in the vertical direction, and when W = (W _g + W _p ) / 2, it is assumed that the plastic thin film 2 can be freely compressed. Is bent toward one side of the plastic thin film 2 (assuming that the glass thin film 1 is located below and the plastic thin film 2 is located above, indicating that the display substrate thin film is bent upward). Although the radius of curvature of the convex portion 10 is ^{_{R g = (h 2 + W}} g 2/4) is ^0.5, likewise display substrate when bent to one side of the glass film 1 (the lower glass film 1, Assuming that the plastic thin film 2 is located on the upper side, it indicates that the display substrate thin film is bent downward.) The radius of curvature of the projection 10 can be further analyzed. When W = (W _g + W _p ) / 2, the radius of curvature of the support protrusion 23 provided between the adjacent recesses 20 in the plastic thin film 2 is R _p = ( the ^{_{h 2 + W p 2/4}} ) 0.5. If W _p = W _g , in the plastic thin film 2, the support protrusions 23 and the protrusions 10 provided between the adjacent recesses 20 have the same radius of curvature, which mainly eliminates deformation of the material. Therefore, this is a conclusion obtained when only the geometrical shape of the convex portion 10 is simply considered.

In fact, the range of the elastic deformation of the plastic is large, in practical applications process, since R _p is much smaller than the radius of curvature of the glass thin film 1, the plastic film 2 is not affected with respect to bending of the glass thin film 1 . If the height value of the protrusion of the protrusion 10 is [1 μm, 100 μm] and the maximum width (side length of the isosceles triangle) W _g of the protrusion 10 is [1 μm, 100 μm], the curvature of the protrusion 10 curvature radius R _g and the support projections 23 radius R _p are both less than 120 [mu] m, since the numerical is considerably smaller than the radius of curvature of the glass thin film 1 of 100 [mu] m (mm grade) thick, thin glass film installation of the projecting portion 10 is 1 does not affect the bending characteristics of the plastic thin film 2 itself, and the support protrusions 23 between the adjacent concave portions 20 do not affect the bending characteristics of the plastic thin film 2 itself. When the display substrate thin film is bent to one side of the plastic thin film 2, the presence of the plastic thin film 2 causes the plastic thin film 2 to bend between adjacent recesses 20 in the plastic thin film 2 under the condition that plastic deformation of the plastic thin film 2 is omitted. Since the support protrusions 23 serve to support the glass thin film 1, it is possible to ensure that the glass thin film 1 is not excessively bent. Similarly, when analyzing the situation in which the display substrate thin film is bent to one side of the glass thin film 1, the convex portion 10 is provided on the glass thin film 1 and plastic deformation of the glass thin film 1 may be omitted. When the display substrate thin film is bent to one side of the glass thin film 1, the convex portion 10 on the glass thin film 1 has a function of supporting the plastic thin film 2, and the bendable display substrate thin film similarly cannot cause excessive bending. In addition, it is possible to ensure that no defect occurs in the glass thin film 1.

When W> ( _Wg + _Wp ) / 2 and _Wp > _Wg , the maximum width of the support protrusion 23 of the plastic thin film 2 is larger than the maximum width of the convex portion 10 of the glass thin film 1, and the characteristics of the plastic thin film 2 itself When the size of the projections 10 is large without affecting the bending performance of the plastic thin film 2 by the support projections 23, the support projections 23 on the plastic thin film 2 are The phenomenon that the plastic thin film 2 is peeled off easily occurs, the coefficient of expansion of the plastic thin film 2 is not effectively suppressed, the bond between the glass material and the plastic material becomes loose, and this is disadvantageous for the stress release of the glass thin film 1.

If W _p <W _g , this corresponds to a situation in which the plastic thin film 2 and the glass thin film 1 are easily laminated, and a poor result in this situation is as described above. _{Therefore, W> (W g + W} p) / 2 and it is necessary to avoid a situation parameter is _W p _{<W g,} if the convex portion 10 of the glass film 1 is too large, the influence on the effect of bending In addition, the weight of the display substrate thin film increases. When the plurality of protrusions 10 are arranged in the vertical direction on the upper surface of the glass thin film 1, the description is the same as that for the plurality of protrusions 10 arranged in the horizontal direction except for the bending direction of the display substrate thin film.

FIG. 4 is a schematic diagram illustrating a configuration of a display substrate thin film according to the embodiment of the present invention, and FIG. 5 is a schematic diagram illustrating a configuration of the glass thin film 1 according to the embodiment of the present invention. As shown in FIG. 4 and FIG. 5, as a preferred embodiment, the convex portion 10 is preferably in the shape of a quadrangular prism, and the vertical cross section is preferably in the shape of a quadrangular prism having the same trapezoidal shape. It is arranged laterally on the upper surface of the thin film 1 and has a trapezoidal trapezoidal upper base width of W _g0 , and in the plastic thin film 2, the minimum width of the support protrusion 23 between the adjacent concave portions 20 is W _p0 and is bendable. A display substrate thin film has flexibility in the vertical direction (vertical direction).

When W> (W _g + W _p ) / 2, when the display substrate thin film is bent to one side of the plastic thin film 2, the center-to-center distance between adjacent convex portions 10 is W, and the maximum width of the convex portion 10 ( The lower width of the trapezoid of the same leg) is W _g , the maximum width of the support protrusion 23 between the adjacent concave portions 20 in the plastic thin film 2 is W _p , the radius of curvature of the convex portion 10 is R _g , and the distance between the adjacent concave portions 20. If the radius of curvature of the support projections 23 and _{R p,} under conditions omitted the presence of plastic film 2, the curvature of the convex portion 10 of the glass film 1 radius ^{_{R g = [W g 2 h}} 2 / {(W g -W ^{_{g0) 2 + W g 2/}} 4}] is ^0.5. Similarly, analyzing the situation where the display substrate thin film is bent to one side of the glass thin film 1, when W = (W _g + W _p ) / 2, the plastic thin film under the condition that the presence of the glass thin film 1 is omitted. the radius of curvature of the support projections 23 in 2 ^{_{R p = [W p 2 h}} 2 / {(W p -W p0) 2 + W p 2/4}] is ^0.5.

If W _p = W _g , the support protrusion 23 on the plastic thin film 2 and the convex portion 10 on the glass thin film 1 have the same radius of curvature, which is based on the assumption that the deformation is omitted as in the above description. Therefore, this is a conclusion that can be obtained when simply considering only the geometric shape. In fact, since the range of elastic deformation of the plastic material is large, R _p is considerably smaller than the radius of curvature of the glass thin film 1 in the actual application process, and if the height value of the projection of the projection 10 is [1 μm, 100 μm], When the maximum width (lower bottom width of the same leg trapezoid) W _{g of the} convex portion 10 is [1 μm, 100 μm], W _p0 = 50 μm, R _g and R _p are each smaller than 290 μm, and the numerical value is the thickness. Is considerably smaller than the radius of curvature (millimeter class) of the glass thin film 1 having a thickness of 100 μm, so that the provision of the projections 10 does not affect the bending characteristics of the glass thin film 1 itself. It does not affect the bending characteristics of the plastic thin film 2 itself.

  When the display substrate thin film is bent to one side of the plastic thin film 2, after the bending, the presence of the plastic thin film 2 causes a plastic deformation of the plastic thin film 2 to be performed between adjacent recesses 20 in the plastic thin film 2 under the condition of omitting plastic deformation. Supports the glass thin film 1 to ensure that the glass thin film 1 is not excessively bent. Similarly, in a situation where the display substrate thin film is bent to one side of the glass thin film 1, the glass thin film 1 is provided with a convex portion 10 and plastic deformation of the glass thin film 1 may be omitted. When bent to one side of the thin film 1, the convex portion 10 of the glass thin film 1 serves to support the plastic thin film 2, so that the bendable display substrate thin film similarly cannot be excessively bent, and It is possible to ensure that no defect occurs in the thin film 1.

According to the form of the radius of curvature of the display substrate thin film, the radius of curvature of the display substrate thin film in which the projections 10 have a quadrangular prism shape is larger than the radius of curvature of the display substrate thin film in which the projections 10 have a triangular prism shape. When the bending performance is low, adopting a configuration in which the protrusions 10 are square poles is more advantageous for avoiding excessive bending of the display substrate thin film. _{W> (W g + W p} ) / 2 and if it is _W p> _{W g,} it is advantageous to reduce the weight of the display substrate film _is preferably from W p <2W _g, prevention of occurrence of defects Is advantageous.

  The maximum width of the support protrusion 23 of the plastic thin film 2 is larger than the maximum width of the protrusion 10 of the glass thin film 1, and the support protrusion 23 does not affect the bending performance of the plastic thin film 2 due to the characteristics of the plastic thin film 2 itself. At the same time, when the size of the projections 10 is large, when the display substrate thin film is bent, the phenomenon that the support projections 23 of the plastic thin film 2 are separated from the projections 10 of the glass thin film 1 easily occurs, and the expansion coefficient of the plastic thin film 2 is increased. Is not effectively suppressed, and the glass material and the plastic material cannot be firmly bonded, which is disadvantageous for releasing the stress of the glass thin film 1.

If W _p <W _g , this corresponds to a situation in which the plastic thin film 2 and the glass thin film 1 are simply laminated, and the poor result in this situation is as described above. _{Therefore, W> (W g + W} p) / 2 and it is necessary to avoid a situation parameter is _W p _{<W g,} if the convex portion 10 of the glass film 1 is too large, the influence on the effect of bending In addition, the weight of the display substrate thin film increases. When the plurality of protrusions 10 are vertically arranged on the upper surface of the glass thin film 1, the description is the same as that of the plurality of protrusions 10 arranged in the horizontal direction except for the bending direction of the display substrate thin film.

  FIG. 6 is a schematic diagram illustrating a configuration of the glass thin film 1 according to the embodiment of the present invention. As shown in FIG. 6, as a preferred embodiment, it is preferable that the protrusions 10 have a quadrangular pyramid shape, and that the plurality of protrusions 10 be arranged in a matrix on the upper surface of the glass thin film 1. It may be bent in the horizontal direction or in the vertical direction, but the bending effect when bent in other directions is slightly poor. The distribution density of the protrusions 10 is a uniform display distribution of space, that is, the bases of the protrusions 10 in the same direction are parallel to each other, the distance between the centers of the bottom surfaces of the protrusions 10 is equal, Since the distances between the vertices are equal, the uniformity of bending of the display substrate thin film can be ensured.

  The bending characteristics in the horizontal and vertical directions of the display substrate thin film in which the projections 10 have a quadrangular pyramid shape are similar to the bending characteristics of the display substrate thin film in which the projections 10 have a triangular prism shape, and are affected in other bending directions. It is not recommended that the display substrate thin film according to the present embodiment be bent in another direction because the factors are complicated and the bending effect is poor.

  FIG. 7 is a schematic diagram illustrating a configuration of the glass thin film 1 according to the embodiment of the present invention. As shown in FIG. 7, as a preferred embodiment, it is preferable that the protrusions 10 have a truncated pyramid shape and the plurality of protrusions 10 are arranged in a matrix on the upper surface of the glass thin film 1. Although the flexibility is slightly poor, it is more advantageous to avoid the glass thin film 1 from being excessively bent. The distribution density of the protrusions 10 is a uniform display distribution of space, that is, the sides of the upper and lower bottom surfaces of each protrusion 10 are parallel to each other, and the distance between the centers of the adjacent upper and lower bottom surfaces of each protrusion 10 is equal. Since it is uniformly distributed, uniformity of bending of the display substrate thin film can be secured.

  The bending characteristics in the horizontal direction and the vertical direction of the display substrate thin film in which the convex portion 10 has a truncated quadrangular pyramid shape are similar to the bending characteristics of the display substrate thin film in which the convex portion 10 has a quadrangular prism shape, respectively. In (2), since the influence factor is complicated and the effect of bending is not good, it is not recommended to bend the display substrate thin film according to the embodiment in another direction.

  As a preferred embodiment, when the convex portion 10 in the glass thin film 1 has a semi-cylindrical shape, the effect of bending is similar to the situation where the convex portion 10 has a triangular prism shape or a quadrangular prism shape. In the process, the radius and the distribution density of the projection 10 may be adjusted to obtain a satisfactory bending performance. In the preferred embodiment, the process of analyzing the bending performance when the protrusions 10 are arranged in the horizontal direction or the vertical direction on the upper surface of the glass thin film 1 is the same, but the bending direction of the display substrate thin film is different.

  FIG. 8 is a schematic diagram illustrating a configuration of a display substrate thin film according to the embodiment of the present invention, and FIG. 9 is a schematic diagram illustrating a configuration of the glass thin film 1 according to the embodiment of the present invention. As shown in FIGS. 8 and 9, as a preferred embodiment, when the convex portion 10 in the glass thin film 1 has a spherical crown shape, the convex portion 10 has the same bending ability in either direction. It is difficult to perform quantitative analysis on the radius of curvature of. The bending characteristics in the vertical and horizontal directions of the display substrate thin film are similar to the bending characteristics of the display substrate thin film in which the convex portion 10 has a semi-cylindrical shape. By adjusting the distribution density, satisfactory bending performance can be obtained.

  When arranged in a matrix, the number of protrusions 10 distributed in the edge region of the upper surface of the glass thin film 1 is larger than the number of protrusions 10 distributed in regions other than the edge of the upper surface of the glass thin film 1. The weakest area of the glass thin film 1 and the area where defects are most likely to occur are an area range extending several millimeters inward from the edge of the glass thin film 1. Therefore, occurrence of various defects can be effectively reduced.

  The shape of the projection 10 can be provided in a triangular, trapezoidal, arcuate, semicircular or semielliptical shape, depending on the actual situation. When the sum of the thickness of the glass thin film 1 and the height of the projections 10 is greater than 0.1 mm, the plurality of projections 10 laid in the edge region of the glass thin film 1 is not affected by the flexibility. The bending direction and the arrangement density of the plurality of convex portions 10 laid in a region (inner region) other than the edge of the glass thin film 1 are made to match. When a plurality of protrusions 10 are arranged in a vertical direction or a horizontal direction, it is necessary to provide the protrusions 10 in the edge region of the glass thin film 1 to ensure the bending characteristics, and the next is to reduce the impact resistance. It is to guarantee. When the plurality of protrusions 10 are arranged in a matrix, the number of the protrusions 10 distributed in the edge region is set to be greater than the number of the protrusions 10 distributed in the region other than the edge, and the bendable characteristic is improved. Guarantee is a priority, followed by guaranteeing impact resistance. If the sum of the thickness of the glass thin film 1 and the height of the convex portion 10 is larger than 0.1 mm, the flexibility is high, so that the edge of the glass thin film 1 is provided in a fully-closed type or a largely closed type. However, it is not necessary to consider the form of the configuration of the internal protrusion 10. Such a display substrate thin film has a stronger edge impact resistance, but has poor bending characteristics.

  In a preferred embodiment, the height of the protrusion 10 and the depth of the recess 20 are 100 μm or less. The higher the height of the projections 10 in the glass thin film 1 is, the more advantageous it is for maintaining the mechanical stability of the glass thin film 1 itself, but the drawback is that the flexibility becomes worse and the weight becomes heavier. In the plastic thin film 2, the function of the support protrusion 23 between the adjacent concave portions 20 is to support the glass thin film 1. The thicker the support protrusion 23, the stronger the support function.

  As a preferred embodiment, the thickness of the portion other than the convex portion 10 of the glass thin film 1 is 100 μm or less. Experiments have shown that when the thickness of each alkali glass or non-alkali glass is smaller than 100 μm, all of them have good bendable characteristics.

  As a preferred embodiment, the plastic thin film 2 includes a cover portion 21 provided to face the glass thin film 1 and two edges 22 provided on both sides of the cover portion 21 respectively. The thickness of the portion other than 20 is 400 μm or less, and when the envelope of the glass thin film 1 is satisfied, the thinner the thickness of the plastic thin film 2 is, the better the transmittance is, and the flexibility is more advantageous.

  In a preferred embodiment, the width of the edge 22 is greater than 100 μm and the thickness is 600 μm or less, and the thickness of the edge 22 is other than the thickness of the cover 21 of the plastic thin film 2 and the protrusion 10 of the glass thin film 1. Equal to the value added to the thickness of the part. By covering the edge region of the outer edge of the glass thin film 1, the incidence of defects can be effectively reduced.

  In a preferred embodiment, the thickness of the display substrate thin film at each location is uniform, that is, the thickness of the portion of the glass thin film 1 other than the convex portions 10, the height of the projections of the convex portions 10, and the concave portions 20 of the cover portion 21. The sum of the thicknesses of the other parts is equal to the thickness of the display substrate thin film, and the thickness of the edge portion 22 of the plastic thin film 2 is also equal to the thickness of the display substrate thin film and is 600 μm or less. The thinner the display substrate thin film, the better the flexibility. In general, by reducing the thickness of the glass thin film 1, the thickness of the entire display substrate thin film can be reduced, thereby improving flexibility and reducing the weight of the entire display substrate thin film. Performance can be improved. When the thickness of the glass thin film 1 is only a few microns, the bending characteristics of the display substrate thin film approach the bending characteristics of the plastic thin film 2 and the gas barrier property can still be equal to that of a normal glass substrate. The thickness of the plastic thin film 2 affects the transmittance of the display substrate thin film. When the display substrate thin film is used for purposes other than the back plate, the thickness of the plastic thin film 2 is reduced as much as possible to improve the transmittance of the entire substrate. Let it.

  As a preferred embodiment, the surface undulation of the glass thin film 1 is 0.5 μm / 20 mm or less. The surface roughness of the plastic thin film 2 is 2 nm or less. When the lower surface of the glass thin film 1 is used as a display reference plane, the undulation is effectively reduced by polishing, and the display can satisfy the demand for the substrate thin film. Since the plastic thin film 2 is easy to bend, the undulation is easily corrected in the process of processing, and the surface roughness is a more interesting index for the undulation.

  In a preferred embodiment, the display substrate thin film further includes an electrode disposed on a lower surface of the glass thin film 1 and / or an upper surface of the plastic thin film 2. The electrodes are divided into transparent electrodes and non-transparent electrodes. The transparent electrode can be manufactured from an ITO material, a PEDOT material, a carbon nanotube material, a graphene material, or the like. The non-transparent electrode is composed of a metal electrode, specifically, for example, a metal electrode of aluminum, silver, copper, or the like. The advantage of the design in which the electrodes are attached to the surface of the glass thin film 1 is that it can withstand a high temperature processing process and the thermal stability of the display substrate thin film is good. When the temperature is changed, even if the dimensions of the plastic thin film 2 are changed, the plastic thin film 2 has high thermal stability without affecting the geometric dimensions of the electrodes, which is advantageous for improving the resolution of the display device. . Although lower process temperatures are required when the electrodes are deposited on the surface of the plastic film 2, the electrodes have fairly good bendable properties, especially electrodes made of organic electrode materials, such as PEDOT materials. Is better adhered to the surface of the plastic thin film 2 and the uniformity of the electrode thin film is better.

  As a preferred embodiment, the display device further includes a thin film transistor disposed on the lower surface of the glass thin film 1 and / or the upper surface of the plastic thin film 2. As the thin film transistor, an organic thin film transistor or an inorganic thin film transistor can be used as needed. In the case of using an inorganic thin film transistor, it is advantageous that the thin film film is provided on one side of the glass thin film 1, and the glass thin film 1 withstands a process at a higher temperature. And the shape does not change. Specifically, for example, an a-Si (amorphous silicon) thin film transistor, a p-Si (polysilicon) thin film transistor, an LTPS (low temperature polysilicon) thin film transistor, an IGZO (indium gallium zinc oxide) thin film transistor, and the like are installed on one side of glass. , Adaptable to current manufacturing process environment. When an organic TFT, that is, an OTFT (organic thin film transistor) is adopted, if it is installed on one side of the glass thin film 1 or the plastic thin film 2, the environment of the manufacturing process can be satisfied. The high stability and uniformity of the dimensions of the active elements provided is advantageous for realizing a high-resolution display. When a thin film transistor is disposed on the upper surface of the plastic thin film 2 and an inorganic thin film transistor is used, in order to satisfy the requirements of a high-temperature manufacturing process, the plastic thin film 2 is selected from a high-temperature-resistant material, for example, a PI thin film or a PEN thin film. Appropriate adjustments to the manufacturing process are needed to meet the requirements of thermal stability.

  The present invention further provides a display device. The display device includes the bendable display substrate thin film according to any one of the above embodiments. Preferably, the display is a liquid crystal display, an organic light emitting diode display, or an electronic paper display. When the display device is a liquid crystal display device, liquid crystal display devices having different display modes such as TN (twisted nematic type), STN (super twisted nematic type), IPS, PDLC, Ch-LCD, VA and FLC, etc. are prepared. be able to. Among them, the liquid crystal display devices in the TN display mode are classified into two types, passive and active. At the time of passive display, one side of the plastic thin film 2 may be the inner surface of the liquid crystal cell, one side of the glass thin film 1 may be the inner surface, or one side of the plastic thin film 2 and one side of the glass thin film 1 may be the inner surface. It may be. Since the combination of the inner surfaces of the liquid crystal cell has a low temperature in the manufacturing process environment, the demand for uniformity of the thickness of the liquid crystal cell is not high. At the time of active display, it is preferable to use the glass thin film 1 as the inner surface of the liquid crystal cell, and it can satisfy any of the manufacturing process environments in the manufacturing process of the liquid crystal cell and has a low expansion coefficient, so that the precision of the active element can be accurately determined. And an equivalent active element is formed.

  The arrangement of STN, PDLC, Ch-LCD, passive VA and passive FLC liquid crystal cells is similar to the passive TN type, and IPS, active FLC and active VA are advantageous if the glass thin film 1 is used as the inner surface. Such an arrangement is not absolute. If an OTFT or an organic transparent electrode is employed, the plastic thin film 2 may be used as the inner surface of the liquid crystal cell, and two bendable display substrate thin films of the liquid crystal display device may be used. The requirement that the directions match must be met. Specifically, assuming that a plurality of projections 10 in one display substrate thin film are vertically arranged on the glass thin film 1, the plurality of projections 10 in another display substrate thin film are glass thin films. 1 are arranged vertically or in a matrix. Assuming that the plurality of projections 10 on one display substrate thin film are arranged in the horizontal direction on the glass thin film 1, the plurality of projections 10 on the other display substrate thin film are Are arranged horizontally or in a matrix. Since there are many types of liquid crystal display devices and a wide selection of material combinations, it is possible to select a preferred combination according to the characteristics of the thin film and the requirements of the manufacturing process environment in the actual application process. Do not enumerate. Regardless of which combination is used, the bendable display substrate thin film can achieve the purpose of being bendable, can effectively avoid the occurrence of defects due to excessive bending, and has a simple gas-barrier thin film liquid crystal cell. This level is comparable to that of.

  Preferably, the display may be an organic light emitting diode display. When the display device is an organic light emitting diode display device, the display device may be a top emission or bottom emission display device. Organic light-emitting diodes (OLEDs) are divided into active display and passive display according to the driving principle, and are classified into polymer materials and low-molecular materials according to light emitting materials. Since the substrate thin film material can easily meet the display requirements, the active drive OLED is a current-type element compared to the active drive liquid crystal display device, so stricter requirements are required in terms of charge mobility and uniformity. is there.

  Note that the materials constituting the OLED, for example, the organic light emitting layer, the hole injection layer, the hole transport layer, the electron transport layer, and the electron injection layer are all organic materials, and are more sensitive to oxygen molecules and water molecules. Due to its sensitivity, the demand for gas barrier properties of the display substrate thin film is also high. As can be seen from the above description of the liquid crystal display device, the bendable display substrate thin film is of a very suitable type.

  In the OLED, a bendable display substrate thin film adopts a single layer, an electrode and a display material adopt a laminated type, so that a bend type seems to be easily realized, but it is not so. Due to strict requirements for gas barrier properties, in addition to the display substrate thin film, it is necessary to protect the backside electrode with a normal thin film or substrate thin film, and the bendable display substrate thin film is not only used as a display substrate thin film, It may be used as a substrate thin film to protect the back electrode, and its cost is low.

  The structure of the bendable display substrate thin film has the performance of a gas barrier thin film. When the arrangement direction of the protrusions 10 matches the bending direction required for the display substrate thin film, the entire OLED display device can be bent. Specifically, when the display substrate thin film is bent in the vertical direction, the plurality of protrusions 10 on the glass thin film 1 are arranged in a vertical direction or in a matrix. The plurality of protrusions 10 are arranged in a horizontal direction or in a matrix. Efficient gas barrier properties can be realized without the need for a film coating process, and the cost of the OLED display device can be reduced.

  Preferably, the display device may be an electronic paper display device. A drive backing plate can be created using the bendable display substrate thin film, thereby effectively reducing the cost of flexible electronic paper display. Electronic paper labeling is primarily for changing paper, and low cost is a fundamental requirement. The use of inexpensive plastic thin film 2 and glass thin film 1 can satisfy the demand for a flexible display substrate thin film, and can create conditions for the widespread application of electronic paper.

  The present invention further provides a method for manufacturing a flexible display substrate thin film. The method is a method used for manufacturing the bendable display substrate thin film described above, wherein a glass thin film 1 having a plurality of convex portions 10 on an upper surface is formed by using a rolling method or an etching method. A step of performing laser cutting on the molded glass thin film 1 so as to obtain a glass thin film 1 of a required size; a step of performing washing and drying processing on the glass thin film 1 and the plastic thin film 2; The step of coating the glass thin film 1 with the thin film 2 and the laminating method are used to integrally bond the glass thin film 1 and the plastic thin film 2, and the heating temperature during the laminating process is such that the plastic thin film 2 is softened. A step which is higher than the point temperature and lower than the softening point temperature of the glass thin film 1, and integrally formed with the glass thin film 1 so as to obtain an edge 22 having a required size. Against the plastic film 2 which is engaged, and a step of performing laser cutting. The glass thin film 1 and the plastic thin film 2 are preferably made of a plate-like material, which is advantageous for forming the convex portion 10 with high accuracy, and is also advantageous for increasing the degree of adhesion when combining two types of materials. .

  At the same time, even if the glass thin film 1 and the plastic thin film 2 have some defects, they can be automatically repaired in the heating process of the manufacturing method. Usually, in the laminating process, it is not necessary to use an adhesive, and the bonding can be performed by mere heating. However, when it is difficult to directly adhere the laminated plastic thin film 2 and the glass thin film 1, a transparent adhesive is used. May be sticky.

  The present invention has a simple manufacturing process, has excellent gas barrier properties, and is inexpensive. Adjustment of the thickness of the glass thin film 1 is convenient, the weight of the bendable display substrate thin film is easily reduced, and the shock resistance through the thin film significantly reduces the drop impact resistance and mechanical shock performance of the bendable display substrate thin film. Improved. The attachment of the projections 10 to the surface of the glass thin film 1 is equivalent to significantly increasing the thickness of the glass thin film 1, and improves the thermal shock resistance of the display substrate thin film. In addition to laying the protrusions 10 on the edge of the glass thin film 1 and coating with the plastic thin film 2, the generation of edge defects was effectively avoided.

  By providing the convex portion 10 in the glass thin film 1 and the concave portion 20 in the plastic thin film 2, it is possible to effectively avoid overbending defects and to improve the thermal shock resistance and mechanical shock performance of the bendable display substrate thin film. In addition, the glass thin film 1 can play a role of blocking water vapor and oxygen.

  When the plastic thin film 2 is used as the inner surface, the infiltration of oxygen and moisture from the edge of the plastic is reduced or almost blocked by the provision of the edge projections 11, so that the gas barrier properties of the entire display substrate thin film can be realized. It is not necessary to use an expensive vacuum-coated inorganic thin film, the defects of the glass thin film 1 can be avoided, the resistance to the manufacturing process environment can be improved, and a low-cost flexible display can be realized.

  The produced OLED display device has the same lifetime display performance as the single glass thin film 1 and is therefore particularly applicable to the production of a long-life display device. The convex portion 10 of the glass thin film 1 and the concave portion 20 of the plastic thin film 2 suppress the thermal expansion of the plastic thin film 2 having a high linear expansion coefficient, and a display substrate thin film material having a small linear expansion coefficient can be obtained. Applicable to display devices.

  In general, the tearing of the glass thin film 1 occurs when stress is concentrated on minute defects on the surface, and the thinner the glass thin film 1 is, the more easily the glass thin film 1 is broken. Is difficult. In the display substrate thin film of the present invention, a convex portion 10 having an appropriate shape and density is provided on the surface of the glass thin film 1 to remarkably enhance the strength and toughness of the glass thin film 1 itself, and the plastic thin film 2 is affected by external force. When the substrate is deformed, the rupture stress directed to the defect direction is reduced, so that a substrate having excellent flexibility can be obtained, and the secondary workability and operability can be significantly improved.

  The present invention can avoid the occurrence of defects in the substrate thin film due to excessive bending, has advantages such as strong rigidity, low expansion coefficient and good flat ductility, and has excellent performance of blocking oxygen and water vapor. It can be realized in either transparent or transparent form, and the manufacturing process is simple, low cost, and by using high temperature resistant plastic thin film 2 material, the substrate thin film has high temperature resistance. is there. It is inexpensive, has high stability, can avoid dominant and inferior defects due to the impact of external force, and has strong durability.

  The edge (side surface) of the glass thin film 1 of the present invention is surrounded by a plastic thin film 2 over the entire circumference, and the plastic thin film 2 and the glass thin film 1 are integrally bonded by heat bonding or a transparent adhesive. The surface of the plastic thin film 2 is a smooth plane. It is preferable that the glass thin film 1 is made of a material of alkali glass and non-alkali glass, and it is preferable that the plastic thin film 2 is made of a material such as PET, PEN, TAC and PI.

  Next, application examples of the display substrate thin film according to the present invention will be described in relation to specific dimensions of each structure. Specifically, the glass thin film 1 (including the convex portion 10) uses non-alkali glass, and the plastic thin film 2 uses a PEN material.

As shown in FIGS. 2 and 3, the protrusions 10 have a triangular prism shape and are set so as to be arranged in the horizontal direction on the surface of the glass thin film 1, and have a triangular prism shape having a vertical cross section of an isosceles triangle. , the distance W is 80 [mu] m between the centers between the convex portions 10 adjacent a maximum width 80 [mu] m of the support projections 23 between adjacent recesses 20, the maximum width _{W g} of the convex portion 10 is 80 [mu] m, convex The height h of the part 10 is 100 μm.

If the display substrate film is bent to one side of the plastic film 2, under conditions omitted plastics film 2, the curvature radius R _g of the convex portion 10 of the glass film 1 is 108Myuemu. When analyzing the bending performance of the glass thin film 1, with reference to Corning (registered trademark) Willow (registered trademark) glass, the radius of curvature when the thickness is 100 μm is 180 mm, and the radius of curvature when the thickness is 200 μm. The radius is 370 mm. Since the radius of curvature R _{g of} the convex portion 10 of the glass thin film 1 is considerably small at 108 μm, the convex portion 10 does not affect the bending performance of the glass thin film 1.

  In the plastic thin film 2, the support protrusions 23 between the adjacent concave portions 20 work together with the convex portions 10 in the glass thin film 1 to form a mixed layer having a thickness of about 100 μm. It is determined by the bending performance of the projection 10.

When the display substrate thin film is bent to one side of the plastic thin film 2, the support protrusions 23 between the adjacent recesses 20 in the plastic thin film 2 play a buffering action. Under the condition that the plastic deformation of the plastic thin film 2 is omitted, the support protrusions 23 of the plastic thin film 2 play the function of supporting the glass thin film 1 and ensure that the glass thin film 1 is not over-bent. Similarly, in a situation where the display substrate thin film is bent to one side of the glass thin film 1, the display substrate thin film has flexibility in the longitudinal direction, and when W = W _p = W _g , the presence of the glass thin film 1 under conditions omitted, the radius of curvature of the plastic film 2 is ^{_{R p = (h 2 + W}} p 2/4) 0.5 _{, and the} the R p = 108μm obtained. The support protrusion 23 in the plastic thin film 2 and the convex portion 10 in the glass thin film 1 have the same radius of curvature, which is a conclusion obtained from a geometrical shape based on the assumption that deformation is omitted.

In fact, large range of elastic deformation of the plastic material and therefore practical applications R _p in the process is much smaller than 108μm. When the display substrate thin film is bent to one side of the glass thin film 1, the convex portion 10 in the glass thin film 1 is formed of a plastic thin film because the presence of the convex portion 10 in the glass thin film 1 and the plastic deformation of the glass thin film 1 may be omitted. Since the plastic thin film 2 serves as a support for the plastic thin film 2, the plastic thin film 2 similarly does not bend excessively, and it can be ensured that no defect occurs in the glass thin film 1.

The thickness _{t g} of the portions other than the convex portion 10 of the glass film 1 is a 100 [mu] m, if the thickness _{t p} of the portion other than the recess 20 of the plastic film 2 is 200 [mu] m, the total thickness of the display substrate film 400μm The bendable radius of curvature depends on the radius of curvature of the glass thin film 1.

As shown in FIG. 4 and FIG. 5, when the protrusions 10 are square pillars and are arranged in the horizontal direction on the surface of the glass thin film 1, the pillars preferably have the same vertical cross section as a trapezoid. The trapezoidal upper base width W _g0 = 40 μm, the center-to-center distance W between adjacent protrusions 10 is 80 μm, and the maximum width W _p = 80 μm of the support protrusion 23 between the adjacent recesses 20 is convex. The maximum width of the portion 10 (lower bottom width of the trapezoid of the same leg) W _g = 80 μm, the height h of the convex portion 10 = 100 μm, and the bendable display substrate thin film has flexibility in the vertical direction. .

When W = W _p = W _g , the radius of curvature of the glass thin film 1 is R _g = [W when the display substrate thin film is bent to one side of the plastic thin film 2 under the condition that the presence of the plastic thin film 2 is omitted. ^{_{g 2 h 2 / {(W}} g -W g0) 2 + W g 2/4}] becomes ^0.5 = ^204μm. The radius of curvature is larger than the radius of curvature of the triangular prism-shaped convex portion 108, but is significantly smaller than the radius of curvature of the glass thin film 1 having a thickness of 100 μm, so that the convex portion 10 affects the bending performance of the glass thin film 1. Absent.

  In the plastic thin film 2, the support protrusions 23 between the adjacent concave portions 20 work together with the convex portions 10 in the glass thin film 1 to form a mixed layer having a thickness of about 100 μm. It is determined by the bending performance of the projection 10. The support protrusions 23 between the adjacent recesses 20 in the plastic thin film 2 have a buffering function, and the support protrusions 23 of the plastic thin film 2 support the glass thin film 1 under the condition that plastic deformation of the plastic thin film 2 is omitted. By performing the above, it is ensured that the glass thin film 1 does not have excessive bending defects.

Similarly, in a situation where the display substrate thin film is bent to one side of the glass thin film 1 and the display substrate thin film has flexibility in the longitudinal direction and W = W _p = W _g , the presence of the glass thin film 1 under conditions omitted, the curvature of the plastic film 2 radius ^{_{R P = [W P 2 h}} 2 / {(W P -W P0) 2 + W P 2/4}] is ^0.5 = ^204μm. When the display substrate thin film is bent to one side of the glass thin film 1, the convex portion 10 in the glass thin film 1 is made of plastic because the convex portion 10 exists in the glass thin film 1 and the plastic deformation of the glass thin film 1 may be omitted. The plastic thin film 2 also plays a role of supporting the thin film 2, so that the plastic thin film 2 can also be secured so that no excessive bending occurs and no defect occurs in the glass thin film 1.

From the viewpoint of the radius of curvature of the display substrate thin film, it is necessary that the radius of curvature of the quadrangular prism-shaped convex portion 10 is larger than the radius of curvature of the triangular prism-shaped convex portion 10. When the prism-shaped projection 10 is employed, it is possible to further prevent the bendable display substrate thin film from being excessively bent. The thickness _{t g} of the portions other than the convex portion 10 of the glass film 1 is the 100 [mu] m, when the thickness _{t p} of the portion other than the recess 20 of the plastic film 2 is 200 [mu] m, the total thickness of the display substrate film to 400μm The bendable radius of curvature depends on the radius of curvature of the glass thin film 1.

  As shown in FIG. 6, when the protrusions 10 are square pyramid and are arranged in a matrix on the surface of the glass thin film 1, the geometrical dimensions of the square pyramid of the protrusions 10 are as follows. That is, the bottom side length is 80 μm, the height is 100 μm, the vertical center distance or the horizontal center distance between the convex portions 10 is 120 μm, and the other than the convex portions 10 of the glass thin film 1 Is 100 μm, the thickness of the portion other than the concave portion 20 of the plastic thin film 2 is 200 μm, and the concave portion 20 of the plastic thin film 2 also has a bottom surface side length of 80 μm as a geometric dimension. The height is 100 μm. The thickness of the entire display substrate thin film is 400 μm, the radius of curvature is determined by the glass thin film 1, and the most optimal bending direction is the direction along the base of the quadrangular pyramid.

  As shown in FIG. 7, when the protrusions 10 have a truncated quadrangular pyramid shape and are arranged in a matrix on the surface of the glass thin film 1, the geometrical dimensions of the truncated pyramid shape of the protrusions 10 are as follows. is there. The side length of the upper bottom surface is 40 μm, the side length of the lower bottom surface is 80 μm, the height is 100 μm, the center-to-center distance between the upper bottom surfaces of the projections 10 is 120 μm, or 10, the thickness of the glass thin film 1 other than the projections 10 is 100 μm, the thickness of the plastic thin film 2 other than the recesses 20 is 200 μm, and the thickness of the plastic thin film 2 is 100 μm. The concave portion 20 also has, as geometric dimensions, a side length of the upper bottom surface of 40 μm, a side length of the lower bottom surface of 80 μm, and a height of 100 μm. The total thickness of the bendable display substrate thin film is 400 μm, the bendable radius of curvature is determined by the glass thin film 1, and the most preferable bending direction is a direction along the rear of the base of the truncated pyramid.

  As shown in FIGS. 8 and 9, when the protrusions 10 have a crown shape and are arranged in a matrix on the surface of the glass thin film 1, the geometrical dimensions of the crown shape of the protrusions 10 are as follows. It is. The bottom radius is 120 μm, the height is 100 μm, the center-to-center distance between the bottom surfaces of the projections 10 is 160 μm, the thickness of the glass thin film 1 other than the projections 10 is 100 μm, and the plastic thin film 2 Of the concave portion 20 of the plastic thin film 2 has a bottom radius of 100 μm, a height of 100 μm, and a height of 100 μm. Is 160 μm. The total thickness of the bendable display substrate thin film is 400 μm, and the bendable radius of curvature is determined by the glass thin film 1. There is no most preferable bending direction and almost the same in each bending direction.

  An edge protrusion 11 is further provided on the upper surface of the glass thin film 1, and the edge protrusion 11 is located within a predetermined distance from an edge of the glass thin film 1. These edge projections 11 can effectively reduce the occurrence of various defects. Depending on the actual situation, the cross section of the projection can be provided in a triangular, trapezoidal, arcuate, semicircular or semielliptical shape. In a specific embodiment, the cross-sectional shape is provided in a semicircular shape, the radius is 100 μm, and the height is 100 μm. The edge projections 11 may be provided with reference to the shape, distribution direction, and density of the projections on the glass thin film 1. However, the edge projections 11 have a disadvantage that they do not necessarily have the most suitable protective effect, but have an advantage as an optional feature. , And the bending performance also matches that of the substrate thin film. When the sum of the height of the projections on the glass edge and the thickness of the glass thin film 1 is smaller than 100 μm, when the edge projections 11 are installed in a closed shape, the generation of defects can be more effectively avoided and the bending performance is affected. Absent.

  The cost can be effectively reduced by using alkali glass, for example, sodium glass and neutral borosilicate glass for the passive display element. For the active element, an alkali-free glass having good chemical stability and electrical insulation, mainly an alkali-free aluminosilicate glass, is adopted. The width of the edge 22 of the plastic thin film 2 is preferably selected to be 500 μm. When the surface of the glass thin film 1 is used as a display reference plane, the surface undulation of the glass thin film 1 is adjusted to 0.3 μm / 20 mm by polishing.

  Hereinafter, an application example of the method of manufacturing a display substrate thin film according to the present invention will be described with reference to specific steps of the manufacturing method.

  A glass substrate having a thickness of 0.3 mm is melted to form a glass thin film 1 having a plurality of triangular prism-shaped protrusions 10 by a rolling method. Is 100 μm, the height of the projection 10 is 100 μm, and the maximum width of the projection 10 is 100 μm. Laser cutting is performed on the molded glass thin film 1 to obtain a glass thin film 1 having a required size. In the process, the edge of the glass thin film 1 has a triangular prism-like projection, and the glass thin film 1 has a horizontal projection. It is ensured that the distribution density and direction of the projections coincide with the inside of the glass thin film 1.

  After the glass thin film 1 and the plastic thin film 2 are washed and dried, the plastic thin film 2 is coated with a 400 μm thick plastic thin film 2 so that the outer edge of the plastic thin film 2 is 1 mm larger than the glass thin film 1. Subsequently, the glass thin film 1 and the plastic thin film 2 are integrally bonded by a lamination method, and the width of the edge 22 of the plastic thin film 2 is 500 μm and the thickness of the edge 22 of the plastic thin film 2 is 350 μm by laser cutting. Correction. Thereafter, the surface of the glass thin film 1 is polished so that the surface undulation of the glass thin film 1 is 0.3 μm / 20 mm and the thickness of the bendable display substrate thin film is 350 μm as a whole.

  A plurality of quadrangular prism-shaped protrusions 10 are formed on a glass substrate having a thickness of 100 μm by an etching method, and the thickness of the portion other than the protrusions 10 of the glass thin film 1 is 50 μm, and the height of the protrusions 10 is high. Is 50 μm, the maximum width of the projection 10 is 50 μm, the sealing projection at the edge of the glass thin film 1 is a triangular prism, and the height is 50 μm and the width is 50 μm. Laser cutting is performed on the formed glass thin film 1 to obtain a glass thin film 1 having a required size. The obtained glass is surrounded by triangular prism-shaped projections.

  After the glass thin film 1 and the plastic thin film 2 are washed and dried, the plastic thin film 2 having a thickness of 200 μm is coated on the glass thin film 1 so that the outer edge of the plastic thin film 2 is 1 mm larger than the glass thin film 1. . Subsequently, the glass thin film 1 and the plastic thin film 2 are integrally bonded by a laminating method, and the width of the edge 22 of the plastic thin film 2 is 500 μm and the thickness of the edge 22 of the plastic thin film 2 is 200 μm by laser cutting. Correction. Then, the surface of the glass thin film 1 is polished so that the surface undulation of the glass thin film 1 is 0.5 μm / 20 mm, the thickness of the flexible display substrate thin film is 200 μm, and the thickness of the plastic thin film 2 is 100 μm. I do.

  In the above method of manufacturing a display substrate thin film, the plastic thin film 2 employs a PEN material, and the temperature at which the thin films are laminated by the lamination method is set to 300 ° C. Thereby, a structure in which the plastic thin film 2 is uniformly coated on the surface of the glass thin film 1 is formed.

  Although the above has been described with reference to the preferred embodiment of the present invention, the scope of the technical form of the present invention is not limited to the above. For those skilled in the art, equivalent changes and modifications made based on the configuration and concept of the present invention within the technical scope disclosed in the present invention are included in the technical form of the present invention.

(Note)
(Appendix 1)
A glass thin film having a plurality of convex portions on the upper surface,
And a plastic thin film covering the glass thin film,
The flexible display substrate thin film, wherein the plastic thin film has a concave portion for accommodating a plurality of the convex portions on a lower surface.

(Appendix 2)
The bendable display substrate thin film according to claim 1, wherein the plurality of protrusions are arranged in a horizontal direction, a vertical direction, or a matrix on the upper surface of the glass thin film.

(Appendix 3)
When the plurality of protrusions are arranged in a horizontal direction or a vertical direction on the upper surface of the glass thin film, the protrusions are provided within a range having a predetermined distance from an edge of the glass thin film, and the plurality of protrusions are formed of the glass thin film. 3. The bendable display substrate thin film according to claim 2, wherein an edge projection is provided within a range having a predetermined distance from an edge of the glass thin film when arranged in a matrix on the upper surface of the thin film.

(Appendix 4)
When the plurality of protrusions are arranged in the horizontal direction or the vertical direction on the upper surface of the glass thin film, the protrusions have a semi-cylindrical shape, a triangular prism shape, a quadrangular prism shape, a rectangular parallelepiped shape or a cubic shape, and the plurality of convex portions are formed. Wherein the convex portions have a quadrangular pyramid shape, a truncated quadrangular pyramid shape, a spherical crown shape, or a cubic shape when are arranged in a matrix on the upper surface of the glass thin film. Thin film.

(Appendix 5)
2. The bendable display according to claim 1, wherein the plastic thin film includes a cover portion provided to face an upper surface of the glass thin film and an edge portion provided to face a side surface of the glass thin film. Substrate thin film.

(Appendix 6)
The height of the projections of the projections and the depth of the depressions of the depressions are all 100 μm or less, and the thickness of the glass thin film other than the projections is 100 μm or less,
The bendable display substrate thin film,
An electrode disposed on the lower surface of the glass thin film and / or the upper surface of the plastic thin film;
2. The bendable display substrate thin film according to claim 1, further comprising: a thin film transistor disposed on a lower surface of the glass thin film and / or an upper surface of the plastic thin film.

(Appendix 7)
The width of the edge portion is larger than 100 μm, the thickness of the portion other than the concave portion of the cover portion is 400 μm or less, the surface undulation of the glass thin film is 0.5 μm / 20 mm or less, and the surface roughness of the plastic thin film is 6. The bendable display substrate thin film according to appendix 5, wherein is not more than 2 nm.

(Appendix 8)
A method for manufacturing a bendable display substrate thin film according to Supplementary Note 1, comprising:
Forming a glass thin film having a plurality of convex portions on the upper surface by a rolling method or an etching method,
Laser cutting the molded glass thin film to obtain a glass thin film of a required size,
Performing a cleaning and drying process on the glass thin film and the plastic thin film,
Coating a thin plastic film on a thin glass film;
In the laminating method, the glass thin film and the plastic thin film are integrally bonded. In the laminating process, the heating temperature is higher than the softening point temperature of the plastic thin film and lower than the softening point temperature of the glass thin film. Steps to be
Laser cutting the plastic thin film integrally bonded to the glass thin film to obtain an edge having a required size.

(Appendix 9)
A display device comprising the bendable display substrate thin film according to any one of supplementary notes 1 to 7.

(Appendix 10)
The display device according to claim 9, wherein the display device is a liquid crystal display device, an organic light emitting diode display device, or an electronic paper display device.

1, glass thin film 2, plastic thin film 10, convex portion 11, edge protrusion 20, concave portion 21, cover portion 22, edge portion 23, support protrusion

Claims (9)

A glass thin film having a plurality of convex portions on the upper surface,
And a plastic thin film covering the glass thin film,
The plastics film is edge have a recess for accommodating a plurality of the convex portions on the lower surface is placed opposite the cover portion and which is disposed to face the upper surface of the glass thin film on a side surface of the glass film part Ru comprising a bendable display substrate thin film characterized in that.   The bendable display substrate thin film according to claim 1, wherein the plurality of protrusions are arranged in a horizontal direction, a vertical direction, or a matrix on the upper surface of the glass thin film. When the convex portion of the multiple is arranged in the horizontal direction or the vertical direction on the upper surface of the glass thin film, the convex portion within a range having a predetermined distance is provided from the edge of the glass thin film, the convex portion of the multiple 3. The bendable display substrate thin film according to claim 2, wherein the edge projections are provided within a range having a predetermined distance from an edge of the glass thin film when the is arranged in a matrix on the upper surface of the glass thin film. 4. . When the convex portion of the multiple is arranged in the horizontal direction or the vertical direction on the upper surface of the glass film, wherein the convex portion is semi-cylindrical, triangular prism, quadrangular prism shape, a rectangular parallelepiped shape or a cubic shape, the multiple when the convex portions are arranged in a matrix on the upper surface of the glass film, wherein the convex portion is quadrangular pyramid, a truncated quadrangular pyramid shape, according to claim 1, characterized in that the spherical crown shape or a cubic shape Flexible display substrate thin film. The height of protrusion of the convex portion, and recessed depth of the recess is any even 100μm or less, the thickness of the portion other than the convex portion of the glass film is at 100μm or less,
The bendable display substrate thin film,
An electrode disposed on the lower surface and / or the upper surface of the plastic film of the glass film,
Bendable display substrate thin film according to claim 1, further comprising a, a thin film transistor to be arranged on the lower surface and / or the upper surface of the plastic film of the glass film. The width of the edge portion is greater than 100 [mu] m, the thickness of the portion other than the recess of the cover portion is at 400μm or less, the surface waviness of the glass thin film is a 0.5 [mu] m / 20 mm or less, the surface roughness of the plastic film The bendable display substrate thin film according to claim 1 , wherein the thickness is 2 nm or less. A glass thin film having a plurality of convex portions on the upper surface,
And a plastic thin film covering the glass thin film,
The plastic thin film has a concave portion for accommodating a plurality of the convex portion on the lower surface, a manufacturing method used for manufacturing a bendable display substrate thin film, characterized in that,
The rolling method or etching method, comprising the steps of molding said glass thin film having a plurality of the convex portions on the upper surface,
Respect molded the glass thin film, performing laser cutting, and obtaining a glass thin film of the required size,
The glass thin film and the plastic film of the necessary length, and performing washing and drying process,
A step of covering the plastic film on the glass thin film of the desired dimensions,
In lamination, the glass thin film of the required dimensions as the plastic film comprising the steps of bonding together, in which, when performing the laminating process, the heating temperature is higher than the softening point temperature of the plastic film, and the required Lowering the softening point temperature of the glass thin film of the dimensions ; and
To the plastic film which is attached to a glass thin film integral with the required dimensions, by performing laser cutting, manufacturing bendable display substrate thin film characterized in that it comprises a step, city to obtain the edge of the required dimensions Method. A display device comprising the bendable display substrate thin film according to any one of claims 1 to 6 . The display device according to claim 8 , wherein the display device is a liquid crystal display device, an organic light emitting diode display device, or an electronic paper display device.