JP5629989B2 - COLOR FILTER, ORGANIC EL DISPLAY DEVICE PROVIDED WITH THE COLOR FILTER, AND METHOD FOR FORMING COLOR FILTER - Google Patents

Description

  The present invention relates to a color filter, and more particularly, to a color filter that can efficiently use incident light and a method for forming the same. The present invention also relates to an organic EL display device provided with the color filter.

  Conventionally, liquid crystal display devices and organic EL display devices have been put to practical use as flat displays. These display devices are generally provided with a color filter in order to improve the color purity of light from the light source or to convert the wavelength of light from the light source.

  A conventional color filter has a transparent substrate, a plurality of colored resin layers provided on the transparent substrate, each corresponding to a unit pixel of the display device, and a black matrix layer provided between the colored resin layers. doing. As described above, in the conventional color filter, the black matrix layer is provided between the colored resin layers to prevent light leakage between the pixels.

  However, in the conventional color filter, light incident on the black matrix layer is absorbed by the black matrix layer without being extracted from the color filter. For this reason, there exists a subject that the utilization efficiency of light is bad. In order to solve such a problem, for example, in Patent Document 1, a light shielding layer is provided between the colored resin layers, and a side surface of the light shielding layer is covered with a reflective layer. In this case, of the light incident on the color filter, the light that reaches the light shielding layer is totally reflected by the reflective layer, thereby taking out the light to the display surface side, thereby improving the light utilization efficiency. Yes.

JP 2005-322623 A

  However, in the color filter described in Patent Document 1, the light shielding layer is formed by a printing method, and therefore, it is difficult to form the light shielding layer so that the side surface of the light shielding layer is sufficiently smooth. It is done. Therefore, it is considered that light cannot be totally reflected properly by the reflection layer provided on the side surface of the light shielding layer.

  The present invention has been made in consideration of such points, and an object thereof is to provide a color filter that can efficiently use incident light and a method of forming the same. Another object of the present invention is to provide an organic EL display device provided with the color filter.

  A color filter according to the present invention includes a color filter base material in which a plurality of grooves are formed leaving a partition wall on one side surface, and a color filter layer provided in each groove of the color filter base material. The light incident on the color filter layer from one side is totally reflected at the boundary between the color filter layer and the partition wall.

  In the color filter according to the present invention, a reflection layer may be provided on the surface of each partition wall, and light incident on the color filter layer from one surface may be totally reflected by the reflection layer.

  In the color filter according to the present invention, each groove may be filled with the color filter layer leaving a space, and light incident on the groove from one surface may be totally reflected by the reflective layer.

  The color filter according to the present invention may further include a peripheral frame provided on an outer periphery of one surface of the color filter substrate.

  In the color filter according to the present invention, a reflective layer may be provided on the inner surface of the peripheral frame.

  An organic EL display device according to the present invention includes the color filter described above, a glass substrate disposed on one side of the color filter and supporting the color filter, a glass substrate, an anode, a cathode, And an organic EL layer having an organic light emitting layer provided between the anode and the cathode.

  The method for forming a color filter according to the present invention includes a step of preparing a material, a step of forming a plurality of grooves by leaving a partition wall on one surface of the material, thereby forming a base material for a color filter, and a partition The method includes a step of forming a reflection layer on the surface of the wall to totally reflect light incident in the groove, and a step of forming a color filter layer on the bottom surface of each groove.

  According to the present invention, the color filter includes a color filter base material in which a plurality of grooves are formed leaving a partition wall on one side surface, and a color filter layer provided in each groove of the color filter base material Therefore, the light can be appropriately totally reflected at the boundary between the color filter layer and the partition wall so that light incident on the color filter from one side can be extracted from the other side of the color filter. it can. As a result, light conventionally absorbed in the color filter can be extracted from the color filter, thereby improving the light use efficiency in the color filter.

  According to the invention, an organic EL display device is provided on the one side of the color filter described above, a glass substrate supporting the color filter, the glass substrate, and an anode. And an organic EL layer having a cathode and an organic light emitting layer provided between the anode and the cathode. For this reason, the light can be totally reflected at the partition wall of the color filter so that the light incident on the color filter from one side is extracted from the other side of the color filter. As a result, light conventionally absorbed in the color filter can be extracted from the color filter, thereby improving the efficiency of the organic EL display device.

  According to the invention, the color filter forming method includes a step of preparing a material, and forming a plurality of grooves leaving a partition wall on one surface of the material, thereby forming a color filter substrate. A step, a step of forming a reflective layer on the surface of the partition wall to totally reflect light incident in the groove, and a step of forming a color filter layer on the bottom surface of each groove. For this reason, by forming the groove of the color filter substrate deeply and smoothly, it is possible to form a reflective layer having a sufficient length along the light incident direction and having a smooth surface. As a result, light can be appropriately totally reflected in the reflective layer so that light incident on the color filter from one side can be extracted from the other side of the color filter, thereby improving light utilization efficiency. it can.

FIG. 1 is a longitudinal sectional view showing an organic EL display device according to a first embodiment of the present invention. 2A is a longitudinal sectional view showing the organic EL display device according to the first embodiment of the present invention, and FIG. 2B is an arrow indicating a color filter of the organic EL display device shown in FIG. The figure seen from A, FIG.2 (c) is the figure which looked at the organic electroluminescent layer of the organic electroluminescent display apparatus shown to Fig.2 (a) from the arrow B. FIG. FIG. 3 is a diagram illustrating a state in which light is totally reflected at a boundary between a color filter layer and a color filter substrate in the first embodiment of the present invention. FIGS. 4A, 4B, 4C, and 4D are diagrams illustrating a process of forming a plurality of grooves for a color filter layer in a color filter base material in the first embodiment of the present invention. FIGS. 5A, 5B, and 5C are views showing a process of forming a reflective layer on the surface of the partition wall of the color filter base material in the first embodiment of the present invention. FIG. 6 is a longitudinal sectional view showing an organic EL display device as a first comparative example. FIG. 7 is a longitudinal sectional view showing an organic EL display device as a second comparative example. FIG. 8 is a diagram showing a color filter in a modification of the first embodiment of the present invention. FIG. 9 is a diagram showing a color filter in another modification of the first embodiment of the present invention. FIG. 10 is a diagram showing an organic EL display device according to the second embodiment of the present invention. FIGS. 11A, 11B, and 11C are views showing a process of forming a peripheral frame body in the second embodiment of the present invention. FIG. 12 is a diagram showing an organic EL display device according to the third embodiment of the present invention.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, the entire organic EL display device 40 in the present embodiment will be described with reference to FIG.

Organic EL Display Device As shown in FIG. 1, the organic EL display device 40 includes a color filter 10, a glass substrate 47 that is disposed on one side of the color filter 10 and supports the color filter 10, and the glass substrate 47. The organic EL layer 44 includes an anode 41, a cathode 43, and an organic light emitting layer 42 provided between the anode 41 and the cathode 43. The organic EL display device 40 in the present embodiment is a so-called top emission type, and light emission from the organic EL layer 44 is emitted from the other side of the color filter 10 as indicated by reference numerals (1) to (4) in FIG. It is taken out.

  In addition, an adhesive 30 is interposed between the color filter base material 20 (described later) of the color filter 10 and the glass substrate 47, whereby the color filter 10 and the glass substrate 47 are bonded.

  The glass substrate 47 in the present embodiment is not particularly limited as long as it supports the organic EL layer 44 and can block the outside air, but has good stability, durability, and the like. Therefore, glass or a transparent polymer is preferable.

  The anode 41 is not particularly limited as long as it is a material that can inject holes efficiently. For example, aluminum, chromium, molybdenum, tungsten, copper, silver, gold, and alloys thereof may be used. preferable.

  On the other hand, the cathode 43 is made of a material that is easy to inject electrons and has a good light transmission property, such as lithium oxide or cesium carbonate.

  The organic light emitting layer 42 is not particularly limited as long as it contains a fluorescent organic substance that emits light when a predetermined voltage is applied. For example, a quinolinol complex, an oxazole complex, various laser dyes, Paraphenylene vinylene etc. are mentioned.

  Note that a hole transport layer (not shown) may be provided between the anode 41 and the organic light emitting layer 42 in order to efficiently transport holes injected from the anode 41 to the organic light emitting layer 42. An example of the constituent material of the hole transport layer is tetraphenylbenzidine. Further, a hole injection layer (not shown) may be provided between the anode 41 and the hole transport layer. Further, an electron injection layer (not shown) or an electron transport layer (not shown) may be provided between the organic light emitting layer 42 and the cathode 43.

  As shown in FIG. 1, the organic EL layer 44 provided on the glass substrate 47 is covered with a barrier film 45 that shields moisture. The barrier film 45 is formed by laminating a plurality of layers, for example, 20 layers, and examples of the material of each layer of the barrier film 45 include silicon, aluminum, zinc, tin oxide or oxynitride. However, the barrier film 45 that covers the organic EL layer 44 is not necessarily provided.

  Further, as shown in FIG. 1, a desiccant 46 that adsorbs water vapor in the organic EL display device 40 is disposed between the color filter 10 and the glass substrate 47 so as not to interfere with light emission from the organic EL layer 44. . Examples of the material of the desiccant 46 include barium or calcium oxide. However, the desiccant 46 is not necessarily provided.

  A half mirror layer (not shown) may be provided on the organic EL layer 44. By providing the half mirror layer, the light from the organic EL layer 44 can be transmitted, and the return light from the color filter 10 can be totally reflected as described later. As the half mirror layer, a metal half mirror made of a metal thin film can be used. However, the half mirror layer is not necessarily provided. Even if the half mirror layer is not provided, the return light from the color filter 10 can be totally reflected by the anode 41 at the boundary between the organic light emitting layer 42 and the anode 41.

  The adhesive 30 is not particularly limited as long as it has a function of satisfactorily adhering the color filter substrate 20 of the color filter 10 and the glass substrate 47. For example, vinyl chloride resin, phenol Resin having an adhesive function composed of a single type or a combination of two or more types of resin, silicone resin, epoxy resin, polyester resin, urethane resin, acrylic resin, polybutadiene resin, vinyl acetate resin, etc. Is preferably used.

Color Filter Next, the color filter 10 will be described in detail. As shown in FIG. 1, the color filter 10 includes a color filter substrate 20 in which a plurality of grooves 17 are formed leaving a partition wall 16 on one surface 20 a, and each groove 17 of the color filter substrate 20. Inside, a color filter layer 11 filled with a space is provided. A reflective layer 18 that totally reflects light is provided on the surface of each partition wall 16. For this reason, as will be described later, the light that reaches the partition wall 16 out of the light that has entered the groove 17 of the color filter base material 20 from the one side surface 20a is the reflective layer 18 provided on the surface of the partition wall 16. Is totally reflected. In the present embodiment, the direction perpendicular to the surface 20a on one side of the color filter substrate 20 (the direction indicated by the arrow V in FIG. 1) is the vertical direction.

2 (a), 2 (b), and 2 (c), FIG. 2 (a) is a diagram showing the organic EL display device 40 in the present embodiment, and FIG. 2 (b) is an arrow in FIG. 2 (a). It is a figure which shows the color filter 10 of the organic electroluminescent display device 40 at the time of seeing from A, FIG.2 (c) is an organic electroluminescent layer of the organic EL display device 40 at the time of seeing from the arrow B in Fig.2 (a). FIG. As shown in FIG. 2C, the organic EL layer 44 includes a plurality of unit organic EL layers 44a each corresponding to a unit pixel of the organic EL display device 40, and each unit organic EL layer 44a has a driving wiring. 48 is connected. As shown in FIG. 2B, the grooves 17 of the color filter substrate 20 are formed so that each unit organic EL layer 44a and each groove 17 correspond one-to-one. In the groove 17 and the unit organic EL layer 44a, each length s ₃ and s ₅ is, for example, 300 μm, and each width s ₄ and s ₆ is, for example, 100 μm.

A color filter substrate for now, respectively detail the components of the color filter 10. First, the color filter substrate 20 will be described in detail.

  The material of the color filter substrate 20 is not particularly limited as long as the light emission of the organic EL layer 44 can be taken out and moisture and oxygen can be effectively blocked. However, in consideration of processability when forming the groove 17, adhesiveness with the adhesive 30, light transmittance, stability, durability, and the like, it is preferable to use glass, polymer, or the like. In the present embodiment, glass is used as the material of the color filter substrate 20, and its refractive index is, for example, 1.5.

Color filter layer Next, the color filter layer 11 will be described in detail. The color filter layer 11 corrects the light from the organic EL layer 44 or increases the color purity. In the present embodiment, the color filter layer 11 is laminated on the bottom surface 17a of the groove 17 of the color filter substrate 20, as shown in FIG.

In the present embodiment, the color filter layer 11 is composed of any one of a red colored layer, a blue colored layer, and a green colored layer provided corresponding to a predetermined unit organic EL layer 44 a of the organic EL layer 44. The red colored layer, the blue colored layer, and the green colored layer are layers formed by dispersing or dissolving a colorant such as a pigment or dye of each color in a photosensitive resin.
Among these, examples of the colorant used in the red colored layer include perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, anthracene pigments, and isoindoline pigments. These pigments may be used alone or in combination of two or more.
Examples of the colorant used in the blue colored layer include copper phthalocyanine pigments, anthraquinone pigments, indanthrene pigments, indophenol pigments, cyanine pigments, dioxazine pigments, and the like. These pigments may be used alone or in combination of two or more.
Examples of the colorant used in the green coloring layer include phthalocyanine pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine pigments, triphenylmethane basic dyes, isoindoline pigments, and isoindolinone pigments. And pigments. These pigments or dyes may be used alone or in combination of two or more.

The refractive index of the color filter layer 11 composed of any one of the red colored layer, the blue colored layer, and the green colored layer is generally in the range of 1.5 to 1.7. In the present embodiment, For example, it is 1.7. As described above, the refractive index of the color filter substrate 20 is 1.5. Here, as shown in FIG. 3, the incident angle when the light incident on the color filter layer 11 reaches the bottom surface 17 a of the groove 17 of the color filter substrate 20 is defined as θ. In this case, if θ is larger than the critical angle (62 degrees in this case), the light reaching the bottom surface 17a is totally reflected on the bottom surface 17a without entering the color filter substrate 20 according to Snell's law. The That is, the light incident on the color filter layer 11 is totally reflected at the boundary between the color filter layer 11 and the color filter substrate 20.
In the present embodiment, the refractive indexes of the color filter layer 11 and the color filter substrate 20 are not particularly limited, and light having an incident angle within a predetermined range among the light incident on the color filter layer 11. The refractive indexes of the color filter layer 11 and the color filter substrate 20 can be appropriately set so that the light is totally reflected at the boundary between the color filter layer 11 and the color filter substrate 20.

  The color filter layer 11 or the surface 20a on one side of the color filter substrate 20 may be covered with an overcoat layer (not shown) for protecting the color filter layer 11. Further, the color filter layer 11 or the surface 20 a on one side of the color filter substrate 20 is covered with a barrier film (not shown) that blocks moisture released from the color filter layer 11 from entering the organic EL layer 44. Also good. Similar to the barrier film 45 covering the organic EL layer 44, the barrier film covering the color filter layer 11 is formed by laminating a plurality of layers, for example, 20 layers. The material of each layer of the barrier film is silicon, Examples thereof include oxides or oxynitrides of aluminum, zinc or tin.

Reflective layer will be described in detail reflecting layer 18 formed on the surface of the partition wall 16. The material of the reflective layer 18 is not particularly limited as long as it can reflect light, and examples thereof include various metal materials, particularly aluminum, nickel, chromium, and the like. The thickness of the reflective layer 18 formed on the surface of the partition wall 16 is not particularly limited as long as it can obtain a sufficient reflection strength and does not peel from the surface of the partition wall 16, but preferably It exists in the range of 0.05-1 micrometer, More preferably, it exists in the range of 0.12-0.13 micrometer. The method for forming the reflective layer 18 is not particularly limited, and a vacuum deposition method, a sputtering method, a CVD method, an electroless plating solution method, an electroplating solution method, a coating method, an ion plating method, or the like can be used.

  Next, the operation of the present embodiment having such a configuration will be described. Here, first, a method for forming the color filter 10 and the organic EL display device 40 will be described, and then an operation for efficiently extracting light from the organic EL layer 44 by the color filter 10 will be described.

Color Filter Forming Method First, referring to FIGS. 4A, 4B, 4C, and 4D, a color filter substrate in which a plurality of grooves 17 are formed on one surface 20a leaving a partition wall 16. A method of forming 20 will be described. First, a material 26 for forming the color filter substrate 20 is prepared. The material 26 is made of glass having a width of 10 cm × 10 cm.

  Next, as shown in FIG. 4A, the material 26 is provided with a blast resist 31 having resistance to sandblasting. Thereafter, a mask (not shown) in which a pattern corresponding to the groove 17 of the color filter substrate 20 is formed is placed on the blast resist 31 and exposed and developed. As a result, as shown in FIG. 4B, a blast resist 31 having an opening 31a corresponding to the groove 17 is obtained.

Next, the part corresponding to the opening 31a of the blast resistant resist 31 in the material 26 is removed by sandblasting. As a result, a plurality of grooves 17 are formed as shown in FIG. Thereafter, the blast resist 31 is removed to obtain the color filter substrate 20 in which a plurality of grooves 17 are formed on one surface 20a leaving the partition wall 16 as shown in FIG. 4D. It is done. In this case, it is possible to form deep and smooth grooves 17 by using sandblasting, and the depth (length in the vertical direction) s ₁ of each groove 17 is, for example, 20 μm.

  Next, a method of forming the reflective layer 18 on the surface of the partition wall 16 of each groove 17 will be described with reference to FIGS. First, as shown in FIG. 5 (a), on one side surface 20a of the color filter substrate 20, a region where the color filter layer 11 is formed in a later step on the bottom surface 17a of each groove 17, and one side A masking material 32 is provided in a region of the surface 20a where the adhesive 30 is applied in a later step.

  Next, as shown in FIG. 5B, the reflective layer 18 is formed on the surface 20a on one side of the color filter substrate 20 by plating. Thereafter, by removing the masking material 32, the reflective layer 18 can be formed on the surface of the partition wall 16 of each groove 17 as shown in FIG. In this case, as described above, the groove 17 is formed deep and smooth, and therefore, the reflective layer 18 having a sufficient length in the vertical direction and having a smooth surface is formed on the surface of the partition wall 16. be able to. The length of the reflective layer 18 in the vertical direction is, for example, 20 μm.

  Thereafter, the color filter layer 11 is laminated on the bottom surface 17a of each groove 17 by photolithography. As a result, the color filter 10 shown in FIG. 1 is obtained. In this case, the thickness of the color filter layer 11 in the vertical direction is, for example, 3 μm.

Method for Forming Organic EL Display Device After manufacturing the color filter 10 as described above, a glass substrate 47 provided with an organic EL layer 44 is prepared. Next, after the adhesive 30 is applied to the outer periphery of the surface 20a on one side of the color filter substrate 20, the glass substrate 47 and the color filter 10 are bonded. In this way, the organic EL display device 40 shown in FIG. 1 is obtained. In this case, the cell gap s ₂ between the surface 20 a on one side of the color filter substrate 20 and the glass substrate 47 is, for example, 20 μm.

  Before bonding the glass substrate 47 and the color filter 10, as shown in FIG. 1, the organic EL layer 44 may be covered with a barrier film 45, and the color filter layer 11 is overcoated (not shown). And a barrier film (not shown). A desiccant 46 may be disposed between the glass substrate 47 and the color filter 10.

Extraction of Light by Color Filter Next, with reference to FIG. 1, an operation of efficiently extracting light from the organic EL layer 44 by the color filter 10 will be described. Here, four paths among the paths of light incident from one side of the color filter 10 and emitted from the other side will be described.

  First, the route indicated by reference numeral (1) in FIG. 1 will be described. In this case, light is incident on one side of the color filter 10 along the vertical direction, and this light is transmitted through the color filter layer 11 and the color filter substrate 20 and is emitted from the other side of the color filter 10. .

  Next, the route indicated by reference numeral (2) in FIG. 1 will be described. In this case, light is incident on one side of the color filter 10 while being inclined from the vertical direction, and the light that has entered the groove 17 reaches the surface of the partition wall 16. In this case, the reflective layer 18 is provided on the surface of the partition wall 16, and thus the light is totally reflected by the reflective layer 18. Thereafter, the light passes through the color filter layer 11 and the color filter substrate 20 and is emitted from the other side of the color filter 10. As described above, the reflection layer 18 is provided on the surface of the partition wall 16, and the light that is incident on one side of the color filter 10 with an inclination from the vertical direction is reflected on the color filter 10 by totally reflecting the light by the reflection layer 18. It can be taken out properly from the other side.

  Next, the route indicated by reference numeral (3) in FIG. 1 will be described. In this case, light is incident on one side of the color filter 10 with an inclination from the vertical direction, and the light incident in the groove 17 reaches the surface of the partition wall 16 after entering the color filter layer 11. In this case, the reflective layer 18 is provided on the surface of the partition wall 16, and thus the light is totally reflected by the reflective layer 18. Thereafter, the light passes through the color filter layer 11 and the color filter substrate 20 and is emitted from the other side of the color filter 10. As described above, the reflection layer 18 is provided on the surface of the partition wall 16, and the light that is incident on one side of the color filter 10 with an inclination from the vertical direction is reflected on the color filter 10 by totally reflecting the light by the reflection layer 18. It can be taken out properly from the other side.

  Next, the route indicated by reference numeral (4) in FIG. 1 will be described. In this case, light is incident on one side of the color filter 10 with a further inclination from the vertical direction, and the light totally reflected by the reflection layer 18 on the surface of the partition wall 16 is reflected on the color filter layer 11 and the color filter substrate. Total reflection is further performed at the boundary of the material 20. The light totally reflected at the boundary between the color filter layer 11 and the color filter substrate 20 is returned to the organic EL layer 44 side as shown in FIG. 1 and then provided on the organic EL layer 44. It is totally reflected by a layer (not shown), so that the light is incident again on one side of the color filter 10. Thereafter, the light is totally reflected by the reflective layer 18, then passes through the color filter layer 11 and the color filter substrate 20, and is emitted from the other side of the color filter 10. As described above, the reflective layer 18 is provided on the surface of the partition wall 16, and light having an incident angle within a predetermined range among the light incident on the color filter layer 11 is color filter layer 11 and the color filter substrate 20. By setting the refractive indexes of the color filter layer 11 and the color filter base material 20 so as to be totally reflected at the boundary, and by providing a half mirror layer on the organic EL layer 44, the color filter layer 11 and the color filter substrate 20 are vertically Light incident with an inclination from the direction can be appropriately extracted from the other side of the color filter 10.

  As described above, according to the present embodiment, the color filter 10 includes the color filter substrate 20 in which the plurality of grooves 17 are formed leaving the partition wall 16 on the one surface 20a, and the color filter substrate 20. In each of the grooves 17, the color filter layer 11 filled with a space is provided. In addition, a reflective layer 18 is provided on the surface of each partition wall 16, so that light incident on the groove 17 of the color filter substrate 20 from one side surface 20 a is transmitted from the other side of the color filter 10. The light can be totally reflected at the reflective layer 18 so that it can be extracted. Accordingly, light incident on one side of the color filter 10 with an inclination from the vertical direction can be appropriately taken out from the other side of the color filter 10, and thereby the light in the color filter 10 and the organic EL display device 40 can be extracted. The utilization efficiency can be improved.

  In addition, according to the present embodiment, the method of forming the color filter 10 includes the step of preparing the material 26 and the plurality of grooves 17 leaving the partition wall 16 by sandblasting on one surface of the material 26, Thus, the step of forming the color filter substrate 20, the step of forming the reflection layer 18 that totally reflects the light incident in the groove 17 on the surface of the partition wall 16, and the color filter on the bottom surface 17 a of each groove 17. Forming a layer 11. For this reason, the groove 17 of the color filter base material 20 can be formed deeply and smoothly. As a result, the reflective layer 18 having a sufficient length in the vertical direction and having a smooth surface can be separated from the partition wall 16. Can be formed on the surface. For this reason, light can be appropriately totally reflected by the reflective layer 18 so that light incident on the color filter 10 from one side is extracted from the other side of the color filter 10, thereby improving light utilization efficiency. be able to.

  Next, the effect of the present invention will be described in comparison with the first comparative example. As a first comparative example, FIG. 6 shows a color filter glass substrate 51, a color filter layer 11 provided on the color filter glass substrate 51, and a black matrix layer 52 provided between the color filter layers 11. The color filter 53 provided and the organic EL display device 50 provided with the color filter 53 are shown. In this case, the black matrix layer 52 is formed on the color filter glass substrate 51 by photolithography, and the black matrix layer 52 has a property of absorbing light. For this reason, as indicated by reference numeral (2 ') or (3') in FIG. 6, light incident on one side of the color filter 53 with an inclination from the vertical direction is absorbed by the black matrix layer 52.

In the first comparative example shown in FIG. 6, the black matrix layer 52 is formed by a photolithography method. Therefore, the thickness t ₁ is about 2 μm. Therefore, as indicated by reference numeral (4 ′) in FIG. 6, the light from one unit organic EL layer 44b of the organic EL layer 44 is a color corresponding to one unit organic EL layer 44b of the color filter layer 11. The light does not enter the filter layer 11 b, enters the color filter layer 11 c adjacent to the color filter layer 11 b, and then exits from the other side of the color filter 53. That is, light sneak occurs between unit pixels. Thus, since the thickness t ₁ of the black matrix layer 52 is insufficient, it is impossible to reliably prevent the wraparound of light.

  On the other hand, according to the present invention, as described above, the color filter 10 includes the color filter base material 20 in which the plurality of grooves 17 are formed on the surface 20a on one side, leaving the partition wall 16, and the color filter. In each groove 17 of the base material 20 for use, the color filter layer 11 filled with a space is provided. In addition, a reflective layer 18 is provided on the surface of each partition wall 16, so that light incident on the groove 17 of the color filter substrate 20 from one side surface 20 a is transmitted from the other side of the color filter 10. It can be totally reflected by the reflective layer 18 so as to be taken out. Accordingly, light incident on one side of the color filter 10 with an inclination from the vertical direction can be appropriately taken out from the other side of the color filter 10, and thereby the light in the color filter 10 and the organic EL display device 40 can be extracted. The utilization efficiency can be improved.

  Further, according to the present invention, each groove 17 of the color filter substrate 20 is formed by sandblasting. For this reason, the groove 17 can be formed deeply and smoothly, whereby the reflective layer 18 having a sufficient length in the vertical direction, for example, 20 μm, and having a smooth surface is formed on the partition wall 16. It can be formed on the surface. Accordingly, it is possible to more reliably prevent light from sneaking between the unit pixels, thereby improving the light use efficiency in the color filter 10 and the organic EL display device 40.

  Next, the effect of the present embodiment will be described in comparison with the second comparative example. As a second comparative example, FIG. 7 shows a color filter glass substrate 61, a color filter layer 11 provided on the color filter glass substrate 61, a light shielding layer 62 provided between the color filter layers 11, and a light shielding. The color filter 64 provided with the reflective layer 63 provided in the side surface of the layer 62, and the organic electroluminescent display apparatus 60 provided with the said color filter 64 are shown. In this case, the light shielding layer 62 is formed by a printing method. For this reason, the side surface of the light shielding layer 62 is rich in undulations. As a result, the smoothness of the surface of the reflective layer 63 provided on the side surface of the light shielding layer 62 is considered to be poor. For this reason, as indicated by reference numeral (2 ″) in FIG. 7, it is considered that the light reaching the reflection layer 63 may be reflected at a different angle from the case of total reflection. As described above, in the second comparative example, it is considered that reflection occurs at an angle different from that in the case of appropriate total reflection, thereby causing light sneaking between unit pixels.

  On the other hand, according to the present invention, each groove 17 of the color filter substrate 20 is formed by sandblasting. For this reason, the groove 17 of the color filter base material 20 can be formed deeply and smoothly. As a result, the reflective layer 18 having a sufficient length in the vertical direction and having a smooth surface can be separated from the partition wall 16. Can be formed on the surface. For this reason, light can be appropriately totally reflected by the reflective layer 18 so that light incident on the color filter 10 from one side is extracted from the other side of the color filter 10, thereby improving light utilization efficiency. be able to.

  In the present embodiment, an example is shown in which each groove 17 of the color filter substrate 20 is formed by sandblasting. However, the present invention is not limited to this, and the deep and smooth groove 17 can be formed by various methods. For example, the grooves 17 of the color filter substrate 20 may be formed by mechanical cutting or wet etching.

  Moreover, in this Embodiment, as shown in FIG. 1 thru | or FIG. 5, the example which the some groove | channel 17 was formed in the base material 20 for color filters leaving the partition wall 16 extended in a substantially perpendicular direction was shown. However, the present invention is not limited to this, and the plurality of grooves 17 may be formed in the color filter base material 20 leaving the partition wall 16 extending obliquely from the vertical direction. In this case, the degree of inclination of the partition wall 16 can be appropriately set according to the size of the groove 17 and the cell gap between the color filter 10 and the glass substrate 47.

  Further, in the present embodiment, an example is shown in which each groove 17 of the color filter substrate 20 is formed so that each unit organic EL layer 44a and each groove 17 correspond to each other one to one. However, the present invention is not limited to this, and as shown in FIG. 8 or 9, each groove 17 may be formed so that each groove 17 corresponds to a plurality of unit organic EL layers 44a. In this case, as shown in FIG. 8 or FIG. 9, a plurality of color filter layers 11 each corresponding to the unit organic EL layer 44a are provided in each groove 17, and each color filter layer 11 shields light. A black matrix layer 13 is provided. Examples of the material of the black matrix layer 13 include a resin composition containing a black colorant such as carbon black and titanium black. As the resin used in this resin composition, for example, a photosensitive resin having a reactive vinyl group such as an acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber can be used.

  In the present embodiment, the color filter layer 11 is composed of any one of a red colored layer, a blue colored layer, and a green colored layer provided corresponding to a predetermined unit organic EL layer 44a of the organic EL layer 44. Indicated. However, the present invention is not limited to this, and the color filter layer 11 can be appropriately designed according to the light emission characteristics of the organic EL layer 44. For example, when a blue light emitting organic light emitting layer is used as the organic light emitting layer 42 of the organic EL layer 44, the color filter layer 11 is a color conversion phosphor layer (not shown) that converts blue light into green fluorescence or red fluorescence. You may have.

Second Embodiment Next, with reference to FIGS. 10 and 11, a second embodiment of the present invention will be described. Here, FIG. 10 is a diagram showing an organic EL display device according to the second embodiment of the present invention. Reference numerals 11 (a), (b), and (c) denote colors in the second embodiment of the present invention. It is a figure which shows the process of forming a reflection layer in the surface of the partition wall of the filter base material.

  The second embodiment shown in FIG. 10 and FIG. 11 is different only in that the color filter further includes a peripheral frame provided on the outer periphery of one surface of the color filter substrate. Other configurations are substantially the same as those of the first embodiment shown in FIGS. In the second embodiment shown in FIG. 10 and FIG. 11, the same parts as those in the first embodiment shown in FIG. 1 to FIG.

As shown in FIG. 10, the color filter 10 further includes a peripheral frame body 22 provided on the outer periphery of the surface 20 a on one side of the color filter substrate 20. In this case, the height s ₇ of the peripheral frame 22 is formed integrally with the base material 20 a color filter, also peripheral frame 22 has a 14μm example.

  In general, the organic light emitting layer 42 of the organic EL layer 44 is easily affected by moisture and oxygen present in the surroundings. Therefore, when moisture and oxygen enter the organic EL display device 40, the light emitting performance of the organic EL display device 40 is reduced. There is a risk of deterioration. In the present embodiment, by providing the peripheral frame body 22 on the outer periphery of the surface 20a on one side of the color filter substrate 20, as shown in FIG. 10, compared to the case where the peripheral frame body 22 is not provided. Thus, the thickness of the adhesive 30 interposed between the color filter 10 and the glass substrate 47 can be reduced. As a result, the amount of moisture and oxygen that permeate the adhesive 30 and enter the organic EL display device 40 can be reduced, whereby the reliability of the organic EL display device 40 can be improved.

  As shown in FIG. 10, the reflective layer 18 is provided on the inner surface 22 a of the peripheral frame 22 in the same manner as the surface of the partition wall 16 of the color filter substrate 20. Therefore, as will be described later, the light reaching the inner surface 22a of the peripheral frame body 22 among the light from the organic EL layer 44 is totally reflected by the reflection layer 18 provided on the inner surface 22a.

  Next, the operation of the present embodiment having such a configuration will be described. Here, first, a method for manufacturing the color filter 10 and the organic EL display device 40 will be described, and then an operation for efficiently extracting light from the organic EL layer 44 by the color filter 10 will be described.

Method for Forming Color Filter First, a method for forming the peripheral frame 22 will be described with reference to FIGS. 11 (a), (b), (c), and (d). First, a material 26 made of glass having a width of 10 cm × 10 cm is prepared.

  Next, as shown in FIG. 11A, the material 26 is provided with a blast resist 33 having resistance to sand blasting. Thereafter, as shown in FIG. 11B, exposure and development are performed so that the blast resistant resist 31 remains only in the portion corresponding to the peripheral frame 22.

  Next, as shown in FIG.11 (c), parts other than the part corresponding to the peripheral frame 22 are scraped off by the sandblast. Thereafter, by removing the blast resist 33, as shown in FIG. 11 (d), a material 26 in which the peripheral frame 22 is provided on the outer periphery of the one surface 26a can be obtained.

  Next, a plurality of grooves 17 are formed on the surface 26 a on one side of the material 26, leaving the partition wall 16. Thereby, the base material 20 for color filters in which the peripheral frame 22 was provided in the outer periphery of the surface 20a of the one side can be obtained. The method for forming the plurality of grooves 17 is the same as the method described in the first embodiment shown in FIGS.

  Thereafter, the reflective layer 18 is formed on the surface of the partition wall 16 of each groove 17 and the inner surface 22 a of the peripheral frame body 22, and the color filter layer 11 is formed on the bottom surface 17 a of each groove 17. Thereby, the color filter 10 shown in FIG. 10 can be obtained.

Method for Forming Organic EL Display Device After manufacturing the color filter 10 as described above, a glass substrate 47 provided with an organic EL layer 44 is prepared. Next, after the adhesive 30 is applied to the surface 22b on one side of the peripheral frame 22 of the color filter 10, the glass substrate 47 and the color filter 10 are bonded. In this way, the organic EL display device 40 shown in FIG. 10 is obtained. In this case, by providing the peripheral frame body 22 on the outer periphery of the surface 20b on one side of the color filter base material 20, the color filter 10 and the glass substrate 47 can be compared with the case where the peripheral frame body 22 is not provided. The thickness of the adhesive 30 interposed therebetween can be reduced, and the thickness of the adhesive 30 is, for example, 6 μm.

Extraction of Light by Color Filter Next, with reference to FIG. 10, an operation of efficiently extracting light from the organic EL layer 44 by the color filter 10 will be described. Here, of the light from the organic EL layer 44, light that is totally reflected by the reflective layer 18 provided on the inner surface 22a of the peripheral frame 22 (path indicated by reference numeral (5) in FIG. 10) will be described.

  In the path indicated by reference numeral (5) in FIG. 10, light is incident on one side of the color filter 10 with an inclination from the vertical direction, and the light incident on the color filter 10 reaches the inner surface 22 a of the peripheral frame body 22. . In this case, the reflection layer 18 is provided on the inner surface 22 a of the peripheral frame body 22, so that the light is totally reflected by the reflection layer 18. Thereafter, the light passes through the color filter layer 11 and the color filter substrate 20 and is emitted from the other side of the color filter 10. As described above, the reflection layer 18 is provided on the inner surface 22a of the peripheral frame body 22, and the reflection layer 18 totally reflects the light, so that the light incident on one side of the color filter 10 from the vertical direction is colored. The filter 10 can be properly taken out from the other side.

  As described above, according to the present embodiment, the color filter 10 further includes the peripheral frame body 22 provided on the outer periphery of the surface 20 a on one side of the color filter base material 20. For this reason, compared with the case where the peripheral frame 22 is not provided, the thickness of the adhesive 30 interposed between the color filter 10 and the glass substrate 47 can be reduced. Thus, the amount of moisture and oxygen that permeate the adhesive 30 and enter the organic EL display device 40 can be reduced, whereby the reliability of the organic EL display device 40 can be improved.

  Further, according to the present embodiment, the reflective layer 18 is provided on the inner surface 22 a of the peripheral frame 22. For this reason, out of the light incident on the one side of the color filter 10 with an inclination from the vertical direction, the light reaching the inner surface 22 a of the peripheral frame body 22 can be appropriately totally reflected by the reflection layer 18. Accordingly, light incident on one side of the color filter 10 with an inclination from the vertical direction can be appropriately taken out from the other side of the color filter 10, and thereby the light in the color filter 10 and the organic EL display device 40 can be extracted. The utilization efficiency can be improved.

  In the present embodiment, the material 26 in which the peripheral frame body 22 is provided on the outer periphery of the surface 26a on one side is obtained by scraping off the portion of the material 26 other than the portion corresponding to the peripheral frame body 22 by sandblasting. An example is shown. However, the present invention is not limited to this, and a portion other than the portion corresponding to the peripheral frame body 22 of the material 26 is scraped off by various methods, for example, mechanical cutting or wet etching. The raw material 26 provided with the peripheral frame body 22 on the outer periphery can be formed.

  Moreover, in this Embodiment, the peripheral frame 22 showed the example integrally formed with the base material 20 for color filters. However, the present invention is not limited to this, and a peripheral frame body 22 separate from the color filter substrate 20 is connected to the outer periphery of the surface 20b on one side of the color filter substrate 20 through a glass frit or the like. May be. In this case, the peripheral frame body 22 may be formed of the same material as the color filter base material 20 or may be formed of a material different from the color filter base material 20.

  Further, in the present embodiment, as shown by a two-dot chain line in FIG. 10, for the adhesive 30 that extends around the entire circumference of the peripheral frame body 22 and accommodates the adhesive 30 on the surface 22 b on one side of the peripheral frame body 22. The groove 22c may be formed. The depth of the groove 22c is preferably 1 μm or more, more preferably 1 μm or more and 30 μm or less, for example, 5 μm. The width of the groove 22c is preferably 1 μm or more, for example, 5 μm. Accordingly, the thickness of the adhesive 30 can be further reduced while maintaining a strong adhesion between the glass substrate 47 and the peripheral frame body 22, thereby allowing the organic EL display to pass through the adhesive 30. Moisture and oxygen entering the apparatus 40 can be further reduced.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG. Here, FIG. 12 is a diagram showing an organic EL display device according to the third embodiment of the present invention.

  The third embodiment shown in FIG. 12 is different only in that a reflecting layer is not provided on the surface of each partition wall, and the other configuration is the first embodiment shown in FIGS. 1 to 9. Is almost the same. In the third embodiment shown in FIG. 12, the same parts as those in the first embodiment shown in FIGS. 1 to 9 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As described in the first embodiment shown in FIGS. 1 to 9, the refractive index of the color filter layer 11 is 1.7, for example, and the refractive index of the color filter substrate 20 is 1.5, for example. It has become. For this reason, as shown by reference numerals (2) to (4) in FIG. 12, among the light incident on the color filter layer 11 from one side, the light that reaches the surface of the partition wall 16 at an incident angle larger than the critical angle. Can be totally reflected at the boundary between the color filter layer 11 and the partition wall 16. Accordingly, light incident on one side of the color filter 10 with an inclination from the vertical direction can be appropriately taken out from the other side of the color filter 10, and thereby the light in the color filter 10 and the organic EL display device 40 can be extracted. The utilization efficiency can be improved.

  As described above, according to the present embodiment, the color filter 10 includes the color filter substrate 20 in which the plurality of grooves 17 are formed leaving the partition wall 16 on the one surface 20a, and the color filter substrate 20. The color filter layer 11 provided in each of the grooves 17 and the color filter layer 11 and the partition wall so that light incident on the color filter from one side is extracted from the other side of the color filter 10. The light can be appropriately totally reflected at the boundary between the two. As a result, conventionally, light absorbed in the color filter 10 can be extracted from the color filter 10, whereby the light use efficiency in the color filter 10 can be improved.

  In each of the above embodiments, an example in which the organic EL display device 40 including the color filter 10 is obtained has been shown. However, the present invention is not limited to this, and the color filter 10 in the present embodiment may be used in a liquid crystal display device or other display devices. A display device with high light utilization efficiency can be provided.

DESCRIPTION OF SYMBOLS 10 Color filter 11 Color filter layer 13 Black matrix layer 16 Partition wall 17 Groove 17a Groove bottom 18 Reflective layer 20 Color filter base material 20a One side surface of color filter base material 22 Peripheral frame body 22a Inner surface of peripheral frame body 22b One side surface of peripheral frame body 22c Groove of peripheral frame body 26 Material 26a One side surface of material 30 Adhesive 31 Anti-blast resist 31a Opening of anti-blast resist 32 Masking material 33 Anti-blast resist 40 Organic EL display device 41 Anode 42 Organic Light-Emitting Layer 43 Cathode 44 Organic EL Layer 44a Unit Organic EL Layer 45 Barrier Film for Organic EL Layer 46 Desiccant 47 Glass Substrate 48 Drive Wiring 50 Organic EL Display Device 51 Color Filter Glass Substrate 52 Black Matrix Layer 53 Color filter 60 Organic EL Display device 61 glass substrate 62 light shielding layer 63 reflective layer 64 color filter for a color filter

Claims (1)

In the color filter forming method,
The process of preparing the material,
Forming a plurality of grooves leaving a partition wall on one surface of the material, thereby forming a color filter substrate; and
Forming a reflective layer on the surface of the partition wall to reflect the light incident in the groove;
Forming a color filter layer on the bottom surface of each groove,
The color filter substrate is formed such that the partition wall extends in a direction perpendicular to the surface of the color filter substrate ,
A method for forming a color filter, characterized in that the step of forming a plurality of grooves by leaving a partition wall on one surface of the material and thereby forming a color filter substrate is performed by sandblasting .

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