JP2019516139A - Bendable Display Substrate Thin Film, Method of Manufacturing the Same, Display Device - Google Patents

Abstract

A flexible display substrate thin film, a method of manufacturing the same, and a display device are disclosed. Kind Code: A1 A bendable display substrate thin film is formed on a lower surface of a glass thin film (1) having a plurality of projections (10) on the upper surface and a plurality of lower surfaces on the lower surface. And a plastic thin film (2) having a recess (20) for housing the protrusion (10), wherein the plurality of protrusions (10) are in the lateral direction, vertical direction or matrix on the upper surface of the glass thin film (1) Arranged in a shape. The present invention has 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, weight reduction of the flexible display substrate thin film and shock absorption using a plastic thin film are performed to thereby make the flexible display substrate thin film Drop impact resistance and impact resistance have been significantly improved. [Selected figure] Figure 2

Description

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

  In recent years, due to demand 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, Progress has been made in thinning, reducing the weight and softening of display panels such as electronic paper). At present, a substrate thin film that combines flexibility and impact resistance is essential for the curved surface display of large panels that require a truly realistic feeling and the flexibility of portable terminal devices that require portability and convenience, and safety. It 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 lowering the thickness of the substrate in order to impart flexibility to the glass substrate to realize a display of softening. It is possible to have characteristics. 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 a certain degree of flexibility similar to a plastic thin film. However, the thin glass film is still weak in degree of bending and impact resistance, and the thin glass substrate thin film is easily broken in the manufacturing process of the display panel, and the display panel is always broken in use, especially by momentary bending. Latent defects of the glass thin film occur, and there are severe problems such as generation of cracks in future processing and use processes. Therefore, research on the use of a thin plastic film excellent in impact resistance, light in weight and softened instead of a glass substrate thin film as a thin film for a display panel substrate is also one of the important research directions. However, if only plastic thin films are used, it is difficult to avoid the adverse effect on display due to thermal deformation of the thin film, and the display panel is required to have the ability to block oxygen and water vapor (for example, oxygen barrier and water vapor barrier) Not too satisfied. Therefore, although the usual method deposits a film layer consisting of inorganic material on a plastic thin film, such a film layer is expensive and its effect is not ideal, so the cost of the display can be reduced and the lifetime of the display panel It is a disadvantage to improve the flexibility and hinder the wider application of bendable display panels. In order to improve the performance of blocking plastic film oxygen and water vapor, in Patent Document 1 (Japanese Patent Laid-Open No. 2004-82598), a laminate having a gas barrier property in which a metal oxide film and an organic material layer are laminated on a substrate Material was disclosed. Although this is a typical method, the gas barrier properties of the laminate material described in the above-mentioned Patent Document 1 are still not sufficient in the organic electroluminescent display device which is required to have the ability to block oxygen and water vapor.

  Thus, it is possible to easily obtain a flexible film having excellent flexibility and gas barrier properties by laminating in multiple layers, for example, inorganic glass and resin groups disposed on both sides of the inorganic glass. Material layer, and the inorganic thin film is disposed on the side of the one resin base material layer in which the inorganic glass is not disposed, and the inorganic thin film is a peripheral portion of at least one surface of the corresponding resin base layer It is easy to think of a plan to However, such a laminated thin film is, for example, insufficient in impact resistance if the glass thin film is too thin, so defects tend to occur, and if the glass thin film is too thick, the flexibility is significantly reduced, etc. Problems exist. As described above, in the case of simply laminating the glass thin film and the plastic thin film, or coating the film, defects are easily generated due to the lack of flexibility and impact resistance of the flexible thin film on the substrate. It can not solve the problem of strength.

JP 2004-82598 A

  The present invention has been made in view of the above-mentioned problems of the prior 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 of manufacturing the same, and a display device. is there.

The bendable display substrate thin film which is one embodiment of the present invention is
A glass thin film having a plurality of projections on the top surface,
And a plastic thin film covering the glass thin film.
The plastic thin film has a recess on the lower surface for receiving the plurality of protrusions.

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

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

  Furthermore, in the bendable display substrate thin film, when the plurality of convex portions are arranged in the horizontal direction or the vertical direction on the upper surface of the glass thin film, the convex portions have a semicylindrical shape, a triangular prism shape, a quadrangular prism shape, a rectangular parallelepiped shape or When the 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 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 disposed opposite to the top surface of the glass thin film and an edge portion disposed opposite to the side surface of the glass thin film.

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

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

A bendable display substrate thin film production method according to another aspect of the present invention is a production method used for producing the bendable display substrate thin film described above,
Forming a thin glass film having a plurality of projections on the top surface by rolling or etching;
Laser cutting the molded glass thin film to obtain a glass thin film of the 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;
A step of integrally bonding a glass thin film and a plastic thin film by a laminating method, in which the heating temperature at the time of laminating is higher than the softening point temperature of the plastic thin film and lower than the softening point temperature of the glass thin film , Step, and
Laser cutting the plastic film integrally bonded to the glass film to obtain an edge of a desired size.

  A display according to still another aspect of the present invention includes the bendable display substrate thin film described in any 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-described embodiment is used, the bendable display substrate thin film provided by the present invention and the method for manufacturing the same and the display device have a simple manufacturing process and excellent gas barrier properties. In order to avoid the occurrence of tears and cracks in the glass thin film due to mechanical and thermal shocks, the flexible display substrate thin film is made lightweight and vibration is buffered through the plastic thin film, thereby making the bendable display The drop impact resistance and impact resistance of the substrate thin film were significantly improved. In addition to providing projections on the edge of the glass thin film, coating with a plastic thin film effectively avoids the occurrence of edge defects. By placing the convex portion on the glass thin film and the concave portion on the plastic thin film, it is possible to effectively avoid the defect of over bending, and improve the performance of thermal shock and mechanical shock of the bendable display substrate thin film. The thin film can also play a role in blocking water vapor and oxygen. In the case of using a thin plastic film as the inner surface, the provision of convex portions or edge protrusions on the edge of the thin glass film makes it possible to reduce or block the penetration of oxygen and moisture from the edge of the plastic, and to display bendable The substrate thin film also has gas barrier properties similar to the glass substrate thin film.

  The present invention can realize low cost manufacturing of bendable displays, since no vacuum coating is required. Compared with a simple glass thin film, it is more flexible and has the same display performance as the life, and is particularly suitable for the manufacture of a long-life organic electroluminescent display. The projections of the glass thin film and the recesses of the plastic thin film can suppress the thermal expansion of the plastic thin film having a high linear expansion coefficient, and by using the glass thin film as a display reference surface, a display substrate thin film having a low linear expansion coefficient is obtained. Can. Generally, breakage of a glass thin film is caused by generation of minute defects on the surface due to stress concentration, and as the thickness of the glass thin film becomes thinner, it becomes more likely to be broken, making it difficult to thin the glass thin film. In the display substrate thin film according to the present invention, by 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 support projections attached to the surface can buffer external force impact, can suppress stress in the direction of defect tear at the time of deformation, and can provide a flexible display substrate thin film having excellent flexibility. In addition, it can be adapted to the current manufacturing process, and the temperature of the environment in the process of processing the display device and the impact in the process of deformation and transportation have a low probability of generating a defect. According to the above description, in order to realize the gas barrier properties of the display substrate thin film, complicated thin film configuration is not required, and defects of the glass thin film can be avoided, and the environmental resistance of the manufacturing process is enhanced. The manufacturing cost is low.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic which shows the structure of the display-substrate thin film as described in this invention. BRIEF DESCRIPTION OF THE DRAWINGS The schematic which shows the structure of the display-substrate thin film which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The schematic which shows the structure of the glass thin film which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The schematic which shows the structure of the display-substrate thin film which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The schematic which shows the structure of the glass thin film which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The schematic which shows the structure of the glass thin film which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The schematic which shows the structure of the glass thin film which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The schematic which shows the structure of the display-substrate thin film which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The schematic which shows the structure of the glass thin film which concerns on embodiment of this invention. It is a flowchart of the manufacturing method as described in this invention.

  As shown in FIGS. 1, 2, 3, 4, 5, 6, 7, 8 and 9, the bendable display substrate thin film is a glass thin film having a plurality of convex portions 10 on the top surface 1 and a plastic thin film 2 for covering the glass thin film 1, and the plastic thin film 2 has a recess 20 for receiving the plurality of projections 10 on its lower surface.

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

  When the plurality of convex portions 10 are arranged in the horizontal direction or the vertical direction on the upper surface of the glass thin film 1, the convex portions 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 convex portions 10 may have a quadrangular pyramid shape, a quadrangular pyramid shape, a spherical crown shape, or a cubic shape.

  The plastic thin film 2 has a cover 21 installed opposite to the upper surface of the glass thin film 1 and an edge 22 installed opposite to 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 portion other than the convex portion 10 of the glass thin film 1 be 100 μm or less.

  The bendable display substrate thin film further includes an electrode disposed on the lower surface of the glass thin film 1 and / or the upper surface of the plastic thin film 2 and 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. The width of the edge 22 may be greater than 100 μm, and the thickness of the portion of the cover 21 other than the recess 20 may be 400 μm or less.

  The surface waviness of the glass thin film 1 may be 0.5 μm / 20 mm or less, and the surface roughness of the plastic thin film 2 may be 2 nm or less. FIG. 1 is a schematic view showing the structure of a display substrate thin film according to the present invention. In FIG. 1, portions filled with different patterns respectively indicate a recess 20 in the plastic thin film 2 and a protrusion 10 in the glass thin film 1.

The method for producing a bendable display substrate thin film shown in FIG. 10 is a method used for producing the bendable display substrate thin film described above,
Forming a thin glass film 1 having a plurality of projections 10 on the upper surface thereof by rolling or etching;
Obtaining the glass thin film 1 of the required size by performing laser cutting on the molded glass thin film 1;
Performing a cleaning and drying process on 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 the laminating method, in which the heating temperature at the time of performing the lamination process is higher than the softening point temperature of the plastic thin film 2 and the softening of the glass thin film 1 Step below the point temperature,
Laser cutting the plastic film 2 integrally coupled to the glass film 1 to obtain an edge 22 of a desired size.

A display device comprising the bendable display substrate thin film described above.
The display device comprises 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 includes 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 convex portion 10. There is a direct relationship with any of the distribution density. Specifically, for the glass thin film 1, as the thickness of the glass thin film 1 becomes thicker, it becomes more difficult to bend and the weight becomes heavy, but even if it receives an impact of external force, it is difficult to cause dominant defects and recessive defects. Increasing the thickness of the thin film 1 is not necessary for the improvement of the gas barrier properties. That is because even if the thickness of the glass thin film 1 is 1 μm, it has a very high gas barrier ability. The distribution density of the projections 10 in the glass thin film 1 can also increase the weight of the glass thin film 1 in the same manner as increasing the thickness of the glass thin film 1. The influence on sex is slight.

  For the plastic thin film 2, increasing the thickness of the plastic thin film 2 increases the weight, but is advantageous for improving the mechanical impact resistance of the glass thin film 1, and has a water vapor barrier property and an oxygen barrier I can improve the sex. 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 impact resistance. When the thickness of the plastic thin film 2 is increased, the transmittance of the display substrate is lowered, which offsets the effort to reduce the thickness of the display device thin film that can be bent. As described above, in order to improve the water vapor barrier property and the gas barrier performance of the display substrate thin film, the requirement can be reached even if only the thin glass thin film 1 is used, and the thickness of the glass thin film 1 becomes thin. Flexibility also improves. However, when the glass thin film 1 and the plastic thin film 2 are easily laminated, it is difficult to avoid the occurrence of the dominant or recessive defects. In addition to the impact of mechanical force, other causes such as thermal shock, difference in expansion coefficient of glass thin film 1 and plastic thin film 2, stress accumulation of glass thin film 1, difference in elasticity of glass thin film 1 and plastic thin film 2 when bent, etc. Therefore, it is difficult to avoid the occurrence of flaw defects. By providing the projections 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 impact and thermal shock, it is similar to the thick glass thin film 1 Have strength. Since the convex portion 10 in the glass thin film 1 constitutes a mosaic structure housed in the concave portion 20 in the plastic thin film 2, it is advantageous for reduction of shift due to the difference in expansion coefficient, and releases the stress of the glass thin film 1 Thus, it is possible to prevent excessive accumulation of stress, compensate for the difference in elasticity between the glass thin film 1 and the plastic thin film 2 when bent, and avoid the generation of peeling force.

  The convex portions 10 according to the present invention are arranged in the lateral direction, longitudinal direction or in a matrix on the upper surface of the glass thin film 1, and the convex portions 10 have a quadrangular pyramid shape, a quadrangular pyramid shape, a spherical crown shape, a semicylindrical shape, It has a triangular prism shape, a quadrangular prism shape, a rectangular parallelepiped shape or a cubic shape. Hereinafter, different configurations of the convex portion 10 will be described in relation to the influence on the flexibility of the display substrate thin film.

FIG. 2 is a schematic view showing the configuration of the display substrate thin film according to the embodiment of the present invention, and FIG. 3 is a schematic view showing the 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 is a triangular prism shape, preferably a triangular prism shape having an isosceles triangular longitudinal section, and a plurality of convex portions 10 The upper surface of the glass thin film 1 is arranged to be arranged in the lateral direction. Assuming that the thickness of the portion of the glass thin film 1 other than the protrusion 10 is t _g , the thickness of the portion of the plastic thin film 2 other than the recess 20 is t _p , and the height of the protrusion 10 and the depth of the recess 20 are h. The total thickness of the display substrate thin film is t = t _g + t _p + h. In the plastic thin film 2, the distance between the centers of adjacent projections 10 is W, the maximum width of the projections 10 is W _g , and in the plastic thin film 2, the maximum width of the support projections 23 between the adjacent recesses 20 is W _p , The radius of curvature of the portion 10 is R _g , and the radius of curvature of the support projection 23 between the adjacent recesses 20 is R _p . Usually, the radius of curvature of the bendable display substrate thin film is larger than the radius of curvature of the plastic thin film 2, ie, R 、 R _p . The display substrate thin film of the present invention has flexibility in the longitudinal direction, and it is assumed that the plastic thin film 2 can be freely compressed if W = (W _g + W _p ) / 2, the display substrate thin film Is bent toward one side of the plastic thin film 2 (this means that the display substrate thin film is bent upward, assuming that the glass thin film 1 is on the bottom and the plastic thin film 2 is on the top), 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 at the top, the radius of curvature of the convex portion 10 (which indicates that the display substrate thin film is bent downward) can be further analyzed. When W = (W _g + W _p ) / 2, the radius of curvature of the support projection 23 disposed between the adjacent recesses 20 in the plastic thin film 2 is R _p = (under the condition that the glass thin film 1 is omitted). the ^{_{h 2 + W p 2/4}} ) 0.5. If W _p = W _g , in the plastic thin film 2 the support projections 23 and the projections 10 placed between adjacent recesses 20 have the same radius of curvature, which mainly omits the deformation of the material Therefore, it is a conclusion obtained when only the geometric shape of the convex portion 10 is considered.

In fact, since plastic has a large range of elastic deformation, plastic thin film 2 does not affect the bending of glass thin film 1 since R _p is considerably smaller than the curvature radius of glass thin film 1 in an actual application process. . If the height value of the protrusion of the protrusion 10 is [1 μm, 100 μm] and the maximum width of the protrusion 10 (side length of isosceles triangle) W _g is [1 μm, 100 μm], the curvature of the protrusion 10 The radius R _g and the radius of curvature R _p of the support protrusions 23 are both smaller than 120 μm, which is considerably smaller than the radius of curvature (millimeter class) of the glass thin film 1 having a thickness of 100 μm. It does not affect the bending characteristics of 1 itself, and the support projections 23 between adjacent recesses 20 also 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 be bent and after plastic deformation of the plastic thin film 2 is omitted. Since the support projection 23 plays a role of supporting the glass thin film 1, it is possible to ensure that excessive bending of the glass thin film 1 does not occur. Similarly, 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 may be 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 in the glass thin film 1 has a function to support the plastic thin film 2, and the bendable display substrate thin film can not similarly generate excessive bending. It is possible to ensure that no defects occur in the glass thin film 1.

When W> ( _Wg + _Wp ) / 2 and _Wp > _Wg , the maximum width of the support projection 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 In the case where the size of the convex portion 10 is large at the same time without affecting the bending performance of the plastic thin film 2 by the support projections 23, the support projections 23 in the plastic thin film 2 become the glass thin film 1 when the display substrate thin film is bent. The phenomenon of peeling off from the convex portion 10 easily occurs, the expansion coefficient of the plastic thin film 2 can not be effectively suppressed, the bonding between the glass material and the plastic material becomes unstable, and the stress release of the glass thin film 1 is disadvantageous.

In the case of W _p <W _g , this corresponds to a situation in which the plastic thin film 2 and the glass thin film 1 are easily stacked, and the defective 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 As it is given, the weight of the display substrate thin film increases. When the plurality of projections 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 projections 10 arranged in the lateral direction except the bending direction of the display substrate thin film.

FIG. 4 is a schematic view showing the configuration of the display substrate thin film according to the embodiment of the present invention, and FIG. 5 is a schematic view showing the 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 a quadrangular prism shape, and it is preferable that the longitudinal cross section is a quadrangular prism shape having the same trapezoidal trapezoidal shape, and the plural convex portions 10 are glass are arranged in the horizontal direction in the upper surface of the thin film 1, the upper base width of Doashi trapezoid is W _g0, the plastics film 2, minimum width of the support projections 23 between adjacent recesses 20 is W _p0, bendable The 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 distance between centers of the adjacent protrusions 10 is W, the maximum width of the protrusions 10 ( Doashi trapezoidal lower base width) of W _g, in the plastics film 2, the maximum width of the support projections 23 between adjacent recesses 20 W _p, the radius of curvature of R _g of the convex portion _10, between the adjacent concave portions 20 Assuming that the curvature radius of the support projection 23 is R _p , the curvature radius R _g of the convex portion 10 in the glass thin film 1 under the condition of omitting the presence of the plastic thin film 2 = [W _g ² h ² / {(W _g −W ^{_{g0) 2 + W g 2/}} 4}] is ^0.5. Similarly, analyzing the situation in which the display substrate thin film is bent to one side of the glass thin film 1, it is plastic thin film under the condition that the presence of the glass thin film 1 is omitted when W = (W _g + W _p ) / 2. 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 protrusions 23 in the plastic thin film 2 and the projections 10 in the glass thin film 1 have the same radius of curvature, which is based on the assumption that no deformation is to be made as described above. Therefore, it is a conclusion 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 curvature radius of the glass thin film 1 in the actual application process, and the height value of the protrusion of the convex portion 10 is [1 μm, 100 μm], When the maximum width (lower base 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 respectively smaller than 290 μm, and the numerical value is the thickness Is considerably smaller than the radius of curvature (millimeter class) of the 100 .mu.m thin glass film 1, the placement of the projections 10 does not affect the bending characteristics of the glass thin film 1 itself, and the supporting projections 23 between adjacent concaves 20 are also 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 being bent, the plastic thin film 2 is present between the adjacent concave portions 20 in the plastic thin film 2 under the condition that plastic deformation of the plastic thin film 2 is omitted. The support projection 23 located on the side serves to support the glass thin film 1, and it can be ensured that excessive bending of the glass thin film 1 does not occur. Similarly, in a situation where 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 bent to one side of the thin film 1, the convex portion 10 in the glass thin film 1 plays a role of supporting the plastic thin film 2, so that the bendable display substrate thin film can not similarly cause excessive bending, and the glass It can be ensured that no defect occurs in the thin film 1.

According to the form of the curvature radius of the display substrate thin film, the curvature radius of the display substrate thin film in which the convex portion 10 has a quadrangular prism shape is larger than the curvature radius of the display substrate thin film in which the convex portion 10 has a triangular prism shape. When the bending performance is low, it is more advantageous to avoid excessive bending of the display substrate thin film if adopting a configuration in which the convex portion 10 is a square pole. When W> (W _g + W _p ) / 2 and W _p > W _g , it is advantageous to reduce the weight of the display substrate thin film, preferably W _p <2 W _g , and the prevention of the occurrence of defects It is advantageous to

  The maximum width of the support projection 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 characteristic of the plastic thin film 2 itself is that the support projection 23 does not affect the bending performance of the plastic thin film 2 At the same time, when the dimension of the convex portion 10 is large, the phenomenon that the support projection 23 in the plastic thin film 2 is peeled off from the convex portion 10 of the glass thin film 1 easily occurs when the display substrate thin film is bent. However, since the glass material and the plastic material can not be firmly bonded, the stress release of the glass thin film 1 is disadvantageous.

When W _p <W _g , this corresponds to a situation in which the plastic thin film 2 and the glass thin film 1 are easily stacked, and the defective 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 As it is given, the weight of the display substrate thin film increases. When the plurality of projections 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 projections 10 arranged in the lateral direction except the bending direction of the display substrate thin film.

  FIG. 6 is a schematic view showing the 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 convex portions 10 have a quadrangular pyramid shape, and the plurality of convex portions 10 be arranged in a matrix on the upper surface of the glass thin film 1. It may be bent in the lateral direction or in the longitudinal direction, but the bending effect when bent in the other direction is slightly worse. The distribution density of the projections 10 is a uniform display distribution of space, that is, the bases in the same direction of the projections 10 are parallel to each other, the distances between the centers of the bottoms of the projections 10 are equal, Since the distances between the apexes are equal, it is possible to ensure the uniformity of bending of the display substrate thin film.

  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 quadrangular pyramid shape are similar to the bending characteristics of the display substrate thin film in which the convex portion 10 has a triangular prism shape, and influence in other bending directions. It is not recommended to bend the display substrate thin film according to the embodiment in the other direction because the factors are complicated and the effect of bending is poor.

  FIG. 7 is a schematic view showing the 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 convex portions 10 have a quadrangular frustum shape, and the plurality of convex portions 10 be arranged in a matrix on the upper surface of the glass thin film 1. Although the flexibility is a little bad, it is more advantageous to avoid the occurrence of excessive bending of the glass thin film 1. The distribution density of the convex portions 10 is a uniform display distribution of space, that is, the sides of the upper and lower bottom surfaces of the convex portions 10 are parallel to each other, and the distances between the centers of the adjacent upper and lower bottom surfaces of the convex portions 10 are equal. The uniform distribution can ensure the uniformity of the bending of the display substrate thin film.

  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 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. In the above, the influence factor is complicated, and the effect of bending is not good, so it is not recommended to bend the display substrate thin film according to the embodiment in the other 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, and processing of the actual display substrate thin film In the process, the radius of the convex portion 10 and the distribution density may be adjusted to obtain satisfactory bending performance. In the preferred embodiment, the process of analyzing the bending performance in the case where the convex portions 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 view showing the configuration of the display substrate thin film according to the embodiment of the present invention, and FIG. 9 is a schematic view showing the 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, since the convex portion 10 has equal bending ability in either direction, the convex portion 10 It is difficult to perform quantitative analysis for the radius of curvature of The bending characteristics of the display substrate thin film in the longitudinal direction and the lateral direction are similar to the bending characteristics of the display substrate thin film in which the convex portion 10 has a semi-cylindrical shape, and in the process of actual display substrate thin film By adjusting the distribution density, satisfactory bending performance can be obtained.

  When arranged in a matrix, the number of projections 10 distributed in the edge area of the upper surface of the glass thin film 1 is greater than the number of projections 10 distributed in the area other than the edge of the upper surface of the glass thin film 1. The weakest area of the glass thin film 1, the area most susceptible to defects is an area extending several millimeters inward from the edge of the glass thin film 1, and the purpose of placing the projections 10 in this area is the defect of the edge It is possible to effectively reduce the occurrence of various defects.

  The shape of the convex portion 10 can be provided to have a triangular, trapezoidal, circular arc, semicircular or semielliptical cross section 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 larger than 0.1 mm, the plurality of projections 10 provided in the area of the edge of the glass thin film 1 do not affect the flexibility. The bending direction and the arrangement density of the plurality of convex portions 10 provided in the region (inner region) other than the edge of the glass thin film 1 are made to coincide with each other. When the plurality of projections 10 are arranged in the longitudinal direction or the lateral direction, it is preferred to have the projections 10 in the area of the edge of the glass thin film 1 to ensure bending characteristics, and the next is impact resistance. It is to guarantee. When the plurality of projections 10 are arranged in a matrix, the number of projections 10 distributed in the edge area is made larger than the number of projections 10 distributed in the area other than the edge, and the bendable characteristic is The priority is to guarantee, and the second is to guarantee the impact resistance. If the added value 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 the edge of the glass thin film 1 is provided in a totally closed type or a mostly closed type. Although the above may be taken into consideration, the form of the configuration of the internal convex portion 10 may not be taken into consideration. Such display substrate thin films have stronger edge impact resistance capabilities, but weaker bending properties.

  As a preferred embodiment, the height of the convex portion 10 and the depth of the concave portion 20 are 100 μm or less. As the height of the convex portion 10 in the glass thin film 1 becomes higher, it is advantageous for maintaining the mechanical stability of the glass thin film 1 itself, but the disadvantage is that the flexibility becomes worse and the weight becomes heavier. In the plastic thin film 2, the action of the support projection 23 between the adjacent concave portions 20 is to support the glass thin film 1, and the thicker the support projection 23, the stronger the support action.

  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. Through experiments, it was found that when the thickness of various alkali glasses and alkali-free glasses is smaller than 100 μm, they all have good bendable characteristics.

  As a preferred embodiment, the plastic thin film 2 includes a cover portion 21 installed opposite to the glass thin film 1 and two edge portions 22 respectively installed on both sides of the cover portion 21. The thickness of the portion other than 20 is 400 μm or less, and when satisfying the package for the glass thin film 1, the thinner the plastic thin film 2 is, the better the transmittance is, and the flexibility is also more advantageous.

  As 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 convex 10 of the glass thin film 1. It is equal to the sum of the thickness of the part. By covering the area of the outer edge of the glass thin film 1, the incidence of defects can be effectively reduced.

  As a preferred embodiment, the thickness of each portion of the display substrate thin film is uniform, that is, the thickness of the portion other than the convex portion 10 of the glass thin film 1, the height of the protrusion of the convex portion 10, and the concave portion 20 of the cover portion 21. The sum of the thickness of the other portions and the thickness of the display substrate thin film is equal to that of the display substrate thin film, and the thickness of the edge 22 of the plastic thin film 2 is 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. Generally, by reducing the thickness of the glass thin film 1, the thickness of the entire display substrate thin film can be reduced to improve the flexibility and reduce the weight of the entire display substrate thin film. It is possible to improve the quality. If the thickness of the glass thin film 1 is only a few microns, the bending properties of the display substrate thin film approach the bending properties of the plastic thin film 2 and the gas barrier properties can still be comparable to ordinary glass substrates. The thickness of the plastic thin film 2 affects the transmittance of the display substrate thin film, and when the display substrate thin film is used as a 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

  As a preferred embodiment, the surface waviness 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 surface, the undulation can be effectively reduced by polishing, and the display can satisfy the requirements for the substrate thin film. Since the plastic thin film 2 is flexible, undulation is easy to correct in the process, and to the undulation, the surface roughness is a more interesting index.

  In a preferred embodiment, the display substrate thin film further includes an electrode disposed on the lower surface of the glass thin film 1 and / or the upper surface of the plastic thin film 2. The electrode is divided into a transparent electrode and a non-transparent electrode. The transparent electrode can be made of ITO material, PEDOT material, carbon nanotube material or graphene material. The nontransparent electrode is composed of a metal electrode, and specifically, for example, a metal electrode of aluminum, silver, copper or the like. The advantage of the design that allows the electrodes to be attached to the surface of the thin glass film 1 is that it can withstand high temperature processing processes and the thermal stability of the display substrate thin film is good. When the temperature is changed, even if the dimension of the plastic thin film 2 is changed, it has high thermal stability and is advantageous for improving the resolution of the display device without affecting the geometrical dimension of the electrode. . Lower electrode temperatures are required when the electrodes are applied to the surface of the plastic film 2, but the electrodes have rather good bendable properties, in particular electrodes made of organic electrode materials, for example PEDOT materials Has a better adhesion when it is attached to the surface of the plastic film 2 and the uniformity of the electrode film is also good.

  As a preferred embodiment, the display substrate further includes a thin film transistor disposed on the lower surface of the thin film glass film 1 and / or the upper surface of the plastic film 2. The thin film transistor may be an organic thin film transistor or an inorganic thin film transistor if necessary, and when using an inorganic thin film transistor, it is advantageous to be provided on one side of the glass thin film 1 and the glass thin film 1 withstands higher temperature treatment processes. Can be done, 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 etc. , Adaptable to the current manufacturing process environment. When an organic TFT, that is, OTFT (organic thin film transistor) is adopted, the environment of the manufacturing process can be satisfied by installing it on one side of the glass thin film 1 or the plastic thin film 2. The high dimensional stability and uniformity of the active elements are advantageous for realizing high resolution displays. When thin film transistors are disposed on the upper surface of the plastic thin film 2 and inorganic thin film transistors are used, the plastic thin film 2 should be a high temperature resistant material, such as PI thin film or PEN thin film, to meet the requirements of high temperature manufacturing process. Appropriate adjustments to the manufacturing process are required to meet the thermal stability requirements.

  The invention further provides a display device. The display device includes the bendable display substrate thin film according to any one of the above embodiments. The display device is preferably a liquid crystal display device, an organic light emitting diode display device or an electronic paper display device. When the display device is a liquid crystal display device, liquid crystal display devices of different display modes such as TN (twisted nematic type), STN (super twisted nematic type), IPS, PDLC, Ch-LCD, VA and FLC are produced. be able to. Among them, the liquid crystal display device in the TN display mode is divided 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 is the inner surface, or one side of the plastic thin film 2 and one side of the glass thin film 1 It may be Because the combination of the inner surfaces of the liquid crystal cell is at a lower temperature in the manufacturing process environment, the demand for thickness uniformity 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 any manufacturing process environment in the liquid crystal cell manufacturing process can be satisfied and the expansion coefficient is low. Equal active elements are formed.

  The arrangement method of STN, PDLC, Ch-LCD, passive VA and passive FLC liquid crystal cell is similar to passive TN type, and IPS, active FLC and active VA are advantageous if the glass thin film 1 is the inner surface, but Such a placement scheme is not absolute. If an OTFT or an organic transparent electrode is adopted, the plastic thin film 2 may be used as the inner surface of the liquid crystal cell, and two flexible display substrate thin films of the liquid crystal display device may be used. It is necessary to meet the requirement that the directions match. Specifically, assuming that the plurality of convex portions 10 in one of the display substrate thin films are vertically arranged on the glass thin film 1, the plurality of convex portions 10 in the other display substrate thin film is a glass thin film 1 are arranged in the vertical direction or in a matrix. Assuming that the plurality of projections 10 in one of the display substrate thin films are arranged in the lateral direction on the glass thin film 1, the plurality of projections 10 in the other display substrate thin film are on the glass thin film 1. Are arranged horizontally or in a matrix. Since there are many types of liquid crystal display devices and wide selectivity of combinations of materials, it is possible to select preferable combinations according to the characteristics of thin film and requirements of manufacturing process environment in actual application process, but here I do not enumerate. No matter which combination is adopted, the bendable display substrate thin film can achieve the purpose of being bendable, and generation of defects due to excessive bending can be effectively avoided, and the gas barrier property is also simply a thin film liquid crystal cell of glass substrate It is a level comparable to

  Preferably, the display may be an organic light emitting diode display. When the display device is an organic light emitting diode display device, it may be formed on a top emission or bottom emission display device. Organic light emitting diodes (OLEDs) are divided into active display and passive display according to driving principle, and are divided into polymer material and low molecular material according to light emitting materials, in which passive driving has low demand for substrate thin film, Substrate thin-film materials tend to satisfy display requirements, and OLEDs with current drive are more stringent in terms of charge mobility and uniformity, as OLEDs are current-type devices compared to liquid crystals with active drive. is there.

  The materials constituting the OLED, for example, the organic light emitting layer, the hole injecting layer, the hole transporting layer, the electron transporting layer, the electron injecting layer, etc., are all organic materials, and it is more preferable for oxygen molecules and water molecules. Because of the sensitivity, the gas barrier properties of the display substrate thin film are also highly required. As can be seen from the above description of the liquid crystal display, the bendable display substrate thin film is of a very compatible type.

  In the OLED, a bendable display substrate thin film adopts a single layer, an electrode, and a display material adopts a laminate type, so it seems that a bend form is easily realized, but it is not so. With strict requirements for gas barrier properties, it is usually necessary to protect the electrode on the back side by a thin film or substrate thin film in addition to the display 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 protecting the backside electrode, and its cost is low.

  The configuration of the bendable display substrate thin film has the performance of a gas barrier thin film, and when the arrangement direction of the convex portions 10 matches the bend direction required for the display substrate thin film, it is possible to realize bending of the entire OLED display device. Specifically, when the display substrate thin film is bent in the vertical direction, the plurality of convex portions 10 in the glass thin film 1 are arranged in the vertical direction or in a matrix, and when the display substrate thin film is bent in the horizontal direction The plurality of protrusions 10 are arranged in the lateral direction or in a matrix. Efficient gas barrier properties can be achieved and the cost of the OLED display can be reduced without the need for a film coating process.

  Preferably, the display device may be an electronic paper display device. The bendable display substrate membrane can be used to make a driving backing plate, which can effectively lower the cost of flexible electronic paper display. Electronic paper display is mainly to replace paper, and low cost is a basic requirement. The flexible display substrate thin film can meet the requirements by using the cheap plastic thin film 2 and the glass thin film 1, and can create conditions for the spread of application of electronic paper.

  The present invention further provides a method of manufacturing a flexible display substrate thin film. The method is a method used for producing the bendable display substrate thin film as described above, comprising the steps of forming the glass thin film 1 having the plurality of convex portions 10 on the upper surface 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 the glass thin film 1 having a required size, a step of performing cleaning and drying processing on the glass thin film 1 and the plastic thin film 2, The glass thin film 1 and the plastic thin film 2 are integrally bonded by using the step of coating the thin film 2 on the glass thin film 1 and the laminating method, in which the heating temperature at the time of laminating is softening of the plastic thin film 2 Integrally with the glass film 1 so as to obtain a step which is above the point temperature and below the softening point temperature of the glass film 1 and to obtain an edge 22 of the required dimensions. Against the plastic film 2 which is engaged, and a step of performing laser cutting. It is preferable to use a plate-like material for the glass thin film 1 and the plastic thin film 2 and this is advantageous for forming the convex portion 10 with high accuracy, and also for increasing the degree of adhesion when bonding two types of materials. .

  At the same time, even if there are some defects in the glass thin film 1 and the plastic thin film 2, 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 it is possible to bond by mere heating, but when it is difficult for the laminated plastic thin film 2 and the glass thin film 1 to stick directly, a transparent adhesive is used. You may stick.

  The present invention has a simple manufacturing process, excellent gas barrier properties, and low cost. Adjustment of the thickness of the glass thin film 1 is convenient, it is easy to lower the weight of the bendable display substrate thin film, and the shock resistance and mechanical impact performance of the bendable display substrate thin film are remarkable due to the buffer action through the thin film. Improved. Attaching the convex portion 10 to the surface of the glass thin film 1 corresponds 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 projections 10 on the edge of the glass thin film 1, coating with the plastic thin film 2 effectively avoids the occurrence of edge defects.

  By providing the convex portion 10 in the glass thin film 1 and providing the concave portion 20 in the plastic thin film 2, it is possible to effectively avoid the defect of over bending, and improve the performance of thermal shock and mechanical impact of the bendable display substrate thin film 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 installation of the edge projections 11 reduces or substantially blocks the penetration of oxygen and moisture from the edge of the plastic, so that the gas barrier properties of the entire display substrate thin film can be realized. There is no need to use an expensive vacuum-coated inorganic thin film, defects in the glass thin film 1 can be avoided, resistance to the manufacturing process environment can be improved, and low-cost, bendable display can be realized.

  The OLED display device produced has the same display performance as the single glass thin film 1, so that it can be particularly adapted to the production of long-life display devices. The thermal expansion of the plastic thin film 2 having a high linear expansion coefficient is suppressed by the projections 10 of the glass thin film 1 and the recesses 20 of the plastic thin film 2, and a display substrate thin film material having a small linear expansion coefficient can be obtained. It can be applied to applications to display devices.

  Generally, tearing of the glass thin film 1 occurs because stress is concentrated on minute defects on the surface, and as the thickness of the glass thin film 1 becomes thinner, tearing tends to occur, thus realizing thinning. Is difficult. In the display substrate thin film of the present invention, a convex portion 10 having an appropriate shape and density is disposed on the surface of the glass thin film 1 to significantly strengthen the strength and toughness of the glass thin film 1 itself, and the plastic thin film 2 is affected by the impact of external force. When it deform | transforms, since the breaking stress which turns to a defect direction is relieved, the board | substrate excellent in flexibility can be obtained, and also secondary processability and operativity can be improved remarkably.

  The present invention can avoid the generation of substrate thin film defects due to excessive bending, has advantages such as strong rigidity, low expansion coefficient and good planar ductility, and additionally has the ability to block excellent oxygen and water vapor, It can be realized in either transparent or transparent form, and it has features such as making the substrate thin film have high temperature resistance by using the plastic thin film 2 material which is simple in manufacturing process, low in cost and high in temperature. is there. The cost is low, the stability is high, the superiority and the recessive defect due to the impact of external force can be avoided, and the durability is strong.

  The edge (side surface) of the glass thin film 1 of the present invention is surrounded by the 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 to form the glass thin film 1 with materials of alkali glass and alkali-free glass, and it is preferable to form the plastic thin film 2 with materials 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, non-alkali glass is used for the glass thin film 1 (including the convex portion 10), and PEN material is used for the plastic thin film 2.

As shown in FIG. 2 and FIG. 3, the convex portion 10 is in the form of a triangular prism, and is set to be arranged in the lateral direction on the surface of the glass thin film 1, and has a triangular prism shape whose longitudinal cross section is an isosceles triangle The distance W between centers of adjacent convex portions 10 is 80 μm, the maximum width of the support protrusions 23 between adjacent concave portions 20 is 80 μm, and the maximum width W _g of the convex portions 10 is 80 μm. The height h of the portion 10 is 100 μm.

When the display substrate thin film is bent to one side of the plastic thin film 2, the curvature radius R _g of the convex portion 10 of the glass thin film 1 is 108 μm under the condition that the plastic thin film 2 is omitted. When analyzing the bending performance of the glass thin film 1, the curvature radius is 180 mm when the thickness is 100 μm and the curvature when the thickness is 200 μm with reference to Corning® Willow® glass The radius is 370 mm. Since the radius of curvature R _{g of} the convex portion 10 of the glass thin film 1 is so small as 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, and the bending performance thereof is mainly in the glass thin film 1. It is determined by the bending performance of the convex portion 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 effect. Under the condition that plastic deformation of the plastic thin film 2 is omitted, the support projection 23 of the plastic thin film 2 plays the role of supporting the glass thin film 1 and secures that the excessive bending of the glass thin film 1 does not occur. 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 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. Although the support projections 23 in the plastic thin film 2 and the projections 10 in the glass thin film 1 have the same radius of curvature, this is a conclusion obtained from the geometrical shape based on the assumption that deformation is omitted.

In practice, the range of elastic deformation of plastic materials is large, so R _p is much smaller than 108 μm in practical application processes. Since 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, 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 a plastic thin film On the other hand, since the plastic thin film 2 does not cause excessive bending in the same manner as the second example, it is possible to ensure that no defects occur in the glass thin film 1.

When the thickness t _g of the portion other than the convex portion 10 of the glass thin film 1 is 100 μm and the thickness t _p of the portion other than the concave portion 20 of the plastic thin film 2 is 200 μm, the thickness of the entire display substrate thin film is 400 μm 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 convex portion 10 has a quadrangular prism shape and is arranged in the lateral direction on the surface of the glass thin film 1, the quadrangular prism shape having the same trapezoidal trapezoidal cross section is preferable. The upper base width W _{g0 of the} trapezoid is 40 μm, the center-to-center distance W between adjacent convex portions 10 is 80 μm, and the maximum width W _p of support projection 23 between adjacent concave portions 20 is 80 μm. The maximum width (lower base width of the same leg trapezoid) W _{g of the} portion 10 is 80 μm, and the height h of the convex portion 10 is 100 μm, and the bendable display substrate thin film has flexibility in the longitudinal direction .

When W = W _p = W _g and the display substrate thin film is bent to one side of the plastic thin film 2 under the condition of omitting the presence of the plastic thin film 2, the curvature radius of the glass thin film 1 is R _g = [W ^{_{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 108 μm of the triangular prism-shaped convex portion 10 but is considerably smaller than the radius of curvature of the glass thin film 1 having a thickness of 100 μm, so 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, and the bending performance thereof is mainly in the glass thin film 1. It is determined by the bending performance of the convex portion 10. The support projections 23 between the adjacent recesses 20 in the plastic film 2 have a buffer action, and the support projections 23 of the plastic film 2 support the glass film 1 under the condition that plastic deformation of the plastic film 2 is omitted. To ensure that the glass thin film 1 does not have a defect of excessive bending.

Similarly, in the situation where the display substrate thin film is bent to one side of the glass thin film 1, the presence of the glass thin film 1 when the display substrate thin film has flexibility in the longitudinal direction and W = W _p = W _g 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. Since the convex portion 10 exists in the glass thin film 1 and plastic deformation of the glass thin film 1 may be omitted, the convex portion 10 in the glass thin film 1 is plastic when the display substrate thin film is bent to one side of the glass thin film 1 The thin film 2 will play a supporting role, and the plastic thin film 2 can also be secured so as not to generate defects in the glass thin film 1 without causing excessive bending as well.

From the viewpoint of the curvature radius of the display substrate thin film, the curvature radius of the quadrangular prism-shaped convex portion 10 needs to be larger than the curvature radius of the triangular prism-shaped convex portion 10. By employing the prismatic convex portion 10, the occurrence of excessive bending of the bendable display substrate thin film can be better avoided. When the thickness t _g of the portion other than the convex portion 10 of the glass thin film 1 is 100 μm and the thickness t _p of the portion other than the concave portion 20 of the plastic thin film 2 is 200 μm, the thickness of the entire display substrate thin film is 400 μm. The bendable radius of curvature depends on the radius of curvature of the glass thin film 1.

  As shown in FIG. 6, in the case where the convex portions 10 have a quadrangular pyramid shape and are arranged in a matrix on the surface of the glass thin film 1, geometrical dimensions of the quadrangular pyramid shape of the convex portions 10 are as follows. That is, the bottom side length is 80 μm and the height is 100 μm, and the distance between the centers of the respective protrusions 10 in the longitudinal direction or the distance between the centers in the lateral direction is 120 μm. The thickness of the portion is 100 μm, the thickness of the portion other than the recess 20 of the plastic thin film 2 is 200 μm, and the recess 20 of the plastic thin film 2 also has a bottom side length of 80 μm as a geometrical 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 quadrangular pyramid shape and are arranged in a matrix on the surface of the glass thin film 1, the geometric dimensions of the quadrangular pyramid shape of the protrusions 10 are as follows: is there. The side length of the upper base is 40 μm, the side length of the lower base is 80 μm, the height is 100 μm, the center-to-center distance between the upper base of each convex portion 10 is 120 μm, or each convex portion The distance between the centers of the lower and bottom surfaces 10 is 120 μm, the thickness other than the convex portion 10 of the glass thin film 1 is 100 μm, and the thickness other than the concave portion 20 of the plastic thin film 2 is 200 μm. Also in the concave portion 20, as a geometrical dimension, the side length of the upper base is 40 μm, the side length of the lower base is 80 μm, and the height is 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 along the rear of the base of the quadrangular frustum.

  As shown in FIGS. 8 and 9, when the convex portions 10 have a spherical crown shape and are arranged in a matrix on the surface of the glass thin film 1, the geometrical dimensions of the spherical crown shape of the convex portions 10 are as follows. It is. The bottom radius is 120 μm, the height is 100 μm, the center-to-center distance between the bottoms of the projections 10 is 160 μm, and the thickness other than the projections 10 of the glass thin film 1 is 100 μm. Even in the spherical crown shape of the recess 20 of the plastic thin film 2, the thickness other than the recess 20 is 100 .mu.m as the geometrical dimension, the height is 100 .mu.m, and each protrusion 10 The center-to-center distance of the bottom of the 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, and there is no most preferable bending direction, which is 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 positioned within a predetermined distance of the 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-sectional shape of the projections can be provided in a triangular, trapezoidal, circular arc, semicircular or semielliptical shape. In a specific embodiment, the cross-sectional shape is semi-circular, with a radius of 100 μm and a height of 100 μm. The edge projections 11 may also be provided with reference to the arrangement of the shape, distribution direction, and density of the projections in the glass thin film 1, but there is a drawback that they do not necessarily have the most preferable protective effect, but any advantage can be obtained. The area of the substrate thin film can be matched, and the bending performance is also matched with the substrate thin film. If the sum of the height of the protrusion of the glass edge and the thickness of the glass thin film 1 is smaller than 100 μm, installing the edge protrusion 11 in a closed shape can more effectively avoid the occurrence of defects and also affects the bending performance. Absent.

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

  Hereinafter, application examples of the method for producing a display substrate thin film according to the present invention will be described with reference to specific steps of the production 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 convex portions 10 by rolling, and the thickness other than the convex portions 10 of the glass thin film 1 is formed therein. Is 100 μm, the height of the projections 10 is 100 μm, and the maximum width of the projections 10 is 100 μm. Laser cutting is performed on the molded glass thin film 1 to obtain the glass thin film 1 of the required size, but in the process, the longitudinal direction of the edge of the glass thin film 1 becomes a protrusion shape of a triangular prism shape, 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 glass thin film 1 is coated with the plastic thin film 2 having a thickness of 400 μm 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 the 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 350 μm by laser cutting. Make corrections to Thereafter, the surface of the glass thin film 1 is polished so that the surface waviness of the glass thin film 1 is 0.3 μm / 20 mm, and the total thickness of the bendable display substrate thin film is 350 μm.

  A plurality of quadrangular prism-shaped protrusions 10 are formed on a glass substrate having a thickness of 100 μm by etching. Among them, 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. 50 μm, the maximum width of the convex portion 10 is 50 μm, and the sealing protrusion at the edge of the glass thin film 1 is in the shape of a triangular prism, and its height is 50 μm, and its width is 50 microns. Although the glass thin film 1 of a required size can be obtained by performing laser cutting on the molded glass thin film 1, the obtained glass is surrounded by a triangular prism-shaped protrusion.

  After washing and drying the glass thin film 1 and the plastic thin film 2, the glass thin film 1 is coated with the plastic thin film 2 having a thickness of 200 μm 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 the 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. Make corrections to Thereafter, the surface of the glass thin film 1 is polished so that the surface waviness of the glass thin film 1 is 0.5 μm / 20 mm, the total 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 for producing a display substrate thin film, the plastic thin film 2 employs a PEN material, and the temperature is 300 ° C. when laminating the thin film by the laminating method. 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 in relation to the preferred embodiments of the present invention, the scope of the technical form of the present invention is not limited to the above. Those skilled in the art, within the technical scope disclosed in the present invention, include equivalent variations and modifications based on the configuration and concept of the present invention within the scope of the technical form of the present invention.

(Supplementary note)
(Supplementary Note 1)
A glass thin film having a plurality of projections on the top surface,
And a plastic thin film covering the glass thin film.
The bendable display substrate thin film according to claim 1, wherein the plastic thin film has a recess on a lower surface thereof for receiving the plurality of projections.

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

(Supplementary Note 3)
When the plurality of convex portions are arranged in the lateral direction or the vertical direction on the upper surface of the glass thin film, the convex portions are provided within a range having a predetermined distance from the edge of the glass thin film, and the plurality of convex portions are glass thin film 5. The bendable display substrate thin film according to claim 2, wherein an edge protrusion 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 glass substrate.

(Supplementary Note 4)
When the plurality of projections are arranged in the lateral direction or the vertical direction on the upper surface of the glass thin film, the projections 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 In the bendable display substrate according to Additional Note 1, wherein the protrusions are arranged in a matrix on the upper surface of the glass thin film, and the protrusions have a quadrangular pyramid shape, a quadrangular pyramid shape, a spherical crown shape, or a cubic shape. Thin film.

(Supplementary Note 5)
The bendable display as set forth in claim 1, wherein the plastic thin film comprises a cover portion installed facing the upper surface of the glass thin film and an edge portion installed facing the side surface of the glass thin film. Substrate thin film.

(Supplementary Note 6)
The height of the protrusion of the convex portion and the depth of the recess of the concave portion are each 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.
The bendable display substrate thin film is
An electrode disposed on the lower surface of the glass thin film and / or the upper surface of the plastic thin film;
The thin bendable display substrate thin film according to claim 1, further comprising a thin film transistor disposed on the lower surface of the glass thin film and / or the upper surface of the plastic thin film.

(Appendix 7)
The width of the edge is greater than 100 μm, the thickness of the portion other than the recess of the cover portion is 400 μm or less, the surface waviness of the glass thin film is 0.5 μm / 20 mm or less, and the surface roughness of the plastic thin film The bendable display substrate thin film according to claim 5, wherein the thickness is 2 nm or less.

(Supplementary Note 8)
It is a manufacturing method used for manufacture of a flexible display substrate thin film of additional remark 1 statement, and:
Forming a thin glass film having a plurality of projections on the top surface by rolling or etching;
Laser cutting the molded glass thin film to obtain a glass thin film of the 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;
A step of integrally bonding a glass thin film and a plastic thin film by a laminating method, in which when heating is performed, 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 Step to be
And D. performing laser cutting on a plastic thin film integrally bonded to the glass thin film to obtain an edge of a required size.

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

(Supplementary Note 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.

DESCRIPTION OF SYMBOLS 1, Glass thin film 2, Plastic thin film 10, Convex part 11, Edge protrusion 20, Concave part 21, Cover part 22, Edge 23, Support protrusion

Claims (10)

A glass thin film having a plurality of projections on the top surface,
And a plastic thin film covering the glass thin film.
The bendable display substrate thin film according to claim 1, wherein the plastic thin film has a recess on a lower surface thereof for receiving the plurality of projections.   The bendable display substrate thin film according to claim 1, wherein the plurality of convex portions are arranged in a horizontal direction, a vertical direction, or a matrix on the upper surface of the glass thin film.   When the plurality of convex portions are arranged in the lateral direction or the vertical direction on the upper surface of the glass thin film, the convex portions are provided within a range having a predetermined distance from the edge of the glass thin film, and the plurality of convex portions are glass thin film 3. The bendable display substrate thin film according to claim 2, wherein an edge protrusion is provided within a range having a predetermined distance from the edge of the glass thin film when arranged in a matrix on the top surface of the glass.   When the plurality of projections are arranged in the lateral direction or the vertical direction on the upper surface of the glass thin film, the projections 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 The bendable display according to claim 1, wherein the protrusions are quadrangular pyramids, quadrangular pyramids, spherical crowns, or cubes when arranged in a matrix on the upper surface of the glass thin film. Substrate thin film.   The bendable plastic film according to claim 1, characterized in that the plastic thin film comprises a cover portion disposed opposite to the top surface of the glass thin film and an edge portion disposed opposite to the side surface of the glass thin film. Display substrate thin film. The height of the protrusion of the convex portion and the depth of the recess of the concave portion are each 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.
The bendable display substrate thin film is
An electrode disposed on the lower surface of the glass thin film and / or the upper surface of the plastic thin film;
The bendable display substrate thin film according to claim 1, further comprising a thin film transistor disposed on the lower surface of the glass thin film and / or the upper surface of the plastic thin film.   The width of the edge is greater than 100 μm, the thickness of the portion other than the recess of the cover portion is 400 μm or less, the surface waviness of the glass thin film is 0.5 μm / 20 mm or less, and the surface roughness of the plastic thin film 6. The bendable display substrate thin film according to claim 5, wherein the thickness is 2 nm or less. A manufacturing method used for manufacturing the bendable display substrate thin film according to claim 1;
Forming a thin glass film having a plurality of projections on the top surface by rolling or etching;
Laser cutting the molded glass thin film to obtain a glass thin film of the 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;
A step of integrally bonding a glass thin film and a plastic thin film by a laminating method, in which when heating is performed, 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 Step to be
And D. performing laser cutting on a plastic thin film integrally bonded to the glass thin film to obtain an edge of a required size.   A display device comprising the bendable display substrate thin film according to any one of claims 1 to 7.   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.