JP2006178081A - Filter for display and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter for display which prevents color mixing of ink to each other and further increases amount of ink applied onto an upper end part of a convex part by separately constituting the convex part and a substrate and to provide its manufacturing method. <P>SOLUTION: The filter for display is provided with the substrate 11, the convex part 13 formed on the substrate 11 and a colored layer 12 which is formed at the upper end part of the convex part 13 when a solvent in a colored liquid drop evaporates. The convex part 13 is constituted of a material having a contact angle with a liquid drop larger than that of the substrate 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display filter and a method for manufacturing the same.

  Conventionally, display element colors are formed of R (red), G (green), B (blue), and BM (black), and printing, electrodeposition, pigment dispersion by photolithography, R by inkjet, G, B, and BM are formed. Here, the printing method is inferior to other methods in terms of pattern accuracy, and is rarely used in the current display element formation process. In the electrodeposition method, conductivity is indispensable for the colored ink, and since the color purity of the conductive ink is low, vivid color display is difficult to achieve, so the commercial value is low. Furthermore, the pigment dispersion method by photolithography is currently most widely used. However, since photolithography is required at least three times to form R, G, B, and BM, there is a problem that the manufacturing cost increases. The inkjet method has recently been attracting attention as a method that can reduce pattern accuracy, color purity, and manufacturing cost. However, when the colored ink is driven with high accuracy, it mixes with adjacent pixels to reduce display quality. There is.

  In view of such circumstances, Japanese Patent Application Laid-Open No. 11-194209 describes a color filter manufacturing method that avoids color mixing with adjacent pixels and a color filter manufactured by the manufacturing method. In Japanese Patent Application Laid-Open No. 11-194209, first, a holding plate and an ink filling layer provided on the holding plate and having a recess for ink filling are formed. Then, colored ink is filled into the ink filling recesses by an ink jet method to form a colored pattern. After the coloring pattern is formed, a light transmissive layer is formed on the upper surface of the ink filling layer, and the ink filling layer is peeled off from the holding plate to form a color filter.

  In the color filter manufacturing method described in JP-A-11-194209, since ink is filled in the ink filling recess, it is necessary to form a contrast between water repellency and hydrophilicity on the substrate. Therefore, it has been necessary to carry out a special process such as a liquid repellent coating or a liquid repellent treatment with plasma on the surface.

Furthermore, Japanese Patent Application Laid-Open No. 2004-141856 describes a patterning method. In Japanese Patent Application Laid-Open No. 2004-141856, two adjacent indent portions formed on the surface of a substrate are formed. And the method of dripping the droplet of solution material on the surface between indent parts by inkjet is described. Japanese Patent Laid-Open No. 2004-141856 describes that the above method can be applied to a color filter for color display.
Japanese Patent Laid-Open No. 11-194209 JP 2004-141856 A

  However, in the method for manufacturing a color filter described in JP-A-11-194209, the ink filled in the ink filling recess may rise along the wall surface of the ink filling recess. For this reason, there is a problem that the ink filled in the adjacent ink filling portions is mixed in color. Moreover, since it is necessary to carry out a special process such as a liquid repellent coating or a liquid repellent treatment with plasma on the surface, there is also a problem that the manufacturing cost is increased. And in the patterning method described in said Unexamined-Japanese-Patent No. 2004-141856, the indent part is press-molded on the board | substrate with the metal mold | die, The surface between indent parts is comprised with the same material as a board | substrate. Yes.

  For this reason, the surface between the indent portions is the same as the contact angle of the substrate, and the contact angle of the solution material is small. Thereby, the quantity of the solution material dripped at the surface between indent parts was restrict | limited. For this reason, even when the patterning method described in Japanese Patent Application Laid-Open No. 2004-141856 is applied to a color filter, the amount of ink that can be dripped onto the surface between the indented portions can be reduced, and a colored layer can be formed well. There was a problem that it was difficult to do.

  The present invention has been made in view of the problems as described above, and prevents the ink from being mixed, and is applied to the upper end portion of the convex portion by configuring the convex portion and the substrate separately. The object is to improve the amount of ink.

  In one aspect, the display filter according to the present invention is formed by evaporating a solvent of a colored droplet formed on a substrate, a convex portion formed on the substrate, and an upper end portion of the convex portion. The convex portion is made of a material having a larger contact angle with the droplet than that of the substrate. Preferably, the substrate is made of glass containing silicon dioxide as a main component, and at least the tip of the convex portion is made of an organic material. Preferably, the contact angle between the side surface of the convex portion and the droplet is larger than the contact angle between the upper end surface of the convex portion and the droplet. Furthermore, preferably, the outer peripheral edge portion of the upper end surface of the convex portion is formed in a curved surface shape. Preferably, a side surface that is inclined so that the height decreases as the distance from the upper end surface of the convex portion increases in the horizontal direction. The display filter preferably further includes a wiring formed on the substrate, and the convex portion is formed on the wiring. Preferably, the convex portion is subjected to UV resistance treatment. The display filter further includes a transparent electrode formed on the upper surface of the colored layer.

  In one aspect, the method for manufacturing a display filter according to the present invention includes, on a substrate, forming a surface film formed of a material having a contact angle larger than that of the substrate, and patterning the surface film. Forming a convex portion on the substrate. Preferably, the surface film is an organic material film. Preferably, the convex portion is formed by photolithography. Further, the organic material film is irradiated with laser light. Preferably, the tip portion of the blade portion tapered toward the tip portion is scanned in the organic material film to form the convex portion.

  According to the display filter and the method for manufacturing the same according to the present invention, it is possible to prevent ink color mixing and to improve the amount of ink applied to the upper end portion of the convex portion.

  An embodiment according to the present invention will be described with reference to FIGS.

  FIG. 1 is a perspective view of a display filter 10 according to the present embodiment. As shown in FIG. 1, a substrate 11 configured in a flat plate shape, a convex portion 13 formed on the upper surface of the substrate 11, and a colored layer 12 formed on an upper end surface 17 of the convex portion 13. And. The colored layer 12 is configured by evaporating the solvent of the colored droplets. The substrate 11 is made of glass mainly composed of silicon dioxide. The substrate 11 only needs to be made of a highly transparent material, and may be made of plastic or the like.

  The convex portion 13 extends in one direction of the substrate 11. In addition, the plurality of convex portions 13 are arranged at intervals from each other in the direction intersecting the direction in which the convex portions 13 extend. In the present embodiment, the convex portion 13 extends in one direction on the substrate 11, but is not limited thereto. For example, it may be formed in a dot pattern.

  The contact angle between the colored droplet that becomes the colored layer 12 and the convex portion 13 is larger than the contact angle between the colored droplet that becomes the colored layer 12 and the substrate 11. For example, the convex portion 13 is made of an organic material, AL, ITO, Ti, W, Ta, Si, SIN, or the like. Examples of the organic insulating material include acrylic, nylon, polypropylene, PET, ABS, polystyrene, polycarbonate, polysulfone, and Teflon (registered trademark), but acrylic resin is the best when judged from applicability, insulation, and transparency.

  2 is a cross-sectional view taken along the line II-II in FIG. 1. As shown in FIG. 2, the convex portion 13 has a substantially rectangular cross-sectional shape. The upper end surface 17 of the convex portion 13 is formed in a flat surface shape, and the side surface 15 is suspended from the outer peripheral edge portion of the upper end surface 17. Therefore, a ridge line portion 19 is formed at the boundary portion between the upper end surface 17 and the side surface 15.

  In addition, in this Embodiment, although the convex part 13 is formed in the rectangular shape in cross-sectional shape, it is not restricted to this. For example, FIG. 3 is a cross-sectional view of a first modification of the convex portion 13 shown in FIG. 2, and even if the cross-sectional shape of the convex portion 13 is formed in a substantially trapezoidal shape as shown in FIG. Good. That is, the upper end surface 17 of the convex portion 13 is formed in a flat surface shape, and the side surface 15 is inclined so that the height decreases as the distance from the upper end surface 17 increases in the horizontal direction. FIG. 4 is a cross-sectional view of a second modification of the convex portion 13. As shown in FIG. 4, the curved surface 30 may be formed on the outer peripheral edge portion of the upper end surface 17 of the convex portion 13. .

  Here, in FIG. 2, the side surface 15 of the convex portion 13 and the surface of the substrate 11 positioned between the convex portions 13 are coated with a fluorine-based surfactant or surface Teflon (registered trademark) with CF4 plasma, or the like. Surface treatment is applied. Thereby, the surface of the board | substrate 11 located between the side surface 15 and the convex part 13 has water repellency. Further, a silane coupling agent is applied to the upper end surface 17 of the convex portion 13 or surface treatment such as excimer UV lamp or pure water cleaning is performed. For this reason, the upper end surface 17 has wettability.

  That is, the contact angle between the side surface 15 of the convex portion 13 and the droplet that becomes the colored layer 12 is configured to be larger than the contact angle between the upper end surface 17 of the convex portion 13 and the droplet that becomes the colored layer 12. Has been. Thereby, the side surface 15 has higher water repellency than the upper end surface 17, and the upper end surface 17 has higher wettability than the side surface 15. In addition, it is preferable that the convex part 13 has been subjected to ultraviolet resistance treatment.

  FIG. 5 is a perspective view showing a first manufacturing process among the manufacturing processes of the display filter 10 configured as described above. As shown in FIG. 5, first, a surface layer 23 made of an organic material or the like is formed on a flat substrate 11. FIG. 6 is a cross-sectional view illustrating a second manufacturing process among the manufacturing processes of the display filter 10. As shown in FIG. 6, a plurality of laser emitting units 25 are arranged on the upper surface of the surface layer 23. A plurality of laser emitting units 25 are arranged at equal intervals. Each laser emitting unit 25 radiates light energy 24 toward the surface layer 23 and sublimates a part of the surface layer 23. As described above, each laser emitting unit 25 is displaced in one direction on the substrate 11 in a state in which the light energy 24 is emitted toward the surface layer 23. For this reason, a plurality of convex portions 13 are formed on the surface layer 23 along the displacement direction of the laser emitting portion 25. In addition, when the convex part 13 is formed by the laser emitting part 25, the upper end surface 17 of the convex part 13 and the side surface 15 are formed so as to be substantially orthogonal. That is, the convex part 13 as shown in FIG. 2 is formed on the substrate 11.

  As the light energy 24, a UV light source is used. However, the light energy may be any of long and short wavelengths as long as an organic material or the like can be processed. The method for patterning the convex portion 13 on the substrate 11 is not limited to the method for forming the convex portion 13 with the light energy 24 as described above, and the convex portion 13 is formed on the substrate 11 by photolithography or cutting with a blade. There is a patterning method.

  FIG. 7 is a cross-sectional view showing a process of forming the convex portion 13 on the substrate 11 by photolithography. As shown in FIG. 7, a mask 26 is disposed on the upper surface side of the substrate 11, and a UV lamp 27 is disposed on the upper surface side of the mask 26. A plurality of slits 26 a are formed in the mask 26. And the convex part 13 is formed on the board | substrate 11 using the photosensitivity which an organic material has. At this time, depending on the exposure conditions with the UV lamp 11 and the mask 12, a curved surface 30 is formed on the outer peripheral edge of the upper end surface 17 of the convex portion 13. In this way, the convex portion 13 shown in FIG. 4 is formed.

  FIG. 8 is a cross-sectional view showing a process of forming the convex portion 13 by cutting the surface layer 23 shown in FIG. As shown in FIG. 8, a plurality of blade portions 28 formed in a tapered shape are arranged at equal intervals toward the tip portion. Then, the tip portions of the plurality of blade portions 28 are embedded in the surface layer 23 shown in FIG. 5 and scanned along the surface of the substrate 11. Thereby, the convex part 13 shown by FIG. 3 is formed. Depending on the cutting conditions, a burr 29 may be formed.

  FIG. 9 is a cross-sectional view illustrating a third manufacturing process among the manufacturing processes of the display filter 10. As shown in FIG. 9, the inkjet 20 is disposed on the substrate 11 on which a plurality of convex portions 13 are formed. The ink jet 20 includes a plurality of ejection units 20a. The discharge part 20 a is disposed on the convex part 13 formed on the substrate 11. Then, the colored droplets 18 are ejected from the front end portion of each ejection portion 20 a toward the upper end surface 17 of the convex portion 13. FIG. 10 is an enlarged cross-sectional view of the convex portion 13, and as shown in FIG. 10, the colored droplets 18 land on the upper end surface 17 of the convex portion 13. The droplet 18 that has landed on the upper end surface 17 tries to keep the surface area small by the force of surface tension. Therefore, it is maintained on the upper end surface 17 without dripping onto the side surface 15 of the convex portion 13 against the gravity.

  For this reason, mixing of the droplets applied to the upper end surface 17 of the adjacent convex portion 13 is suppressed, and color mixing is prevented. Furthermore, the convex part 13 is comprised from the organic material etc. so that the contact angle with the droplet 18 may become large. Thereby, the quantity of the droplet 18 with which the upper end surface 17 of the convex part 13 is filled can be ensured. Further, since the side surface 15 of the convex portion 13 has higher water repellency with respect to the droplet 18 than the upper end surface 17, the portion of the droplet 18 applied on the upper end surface 17 that is located near the ridge line portion 19 is Retreat to the end face 17 side. For this reason, the droplet 18 applied on the upper end surface 17 is difficult to spill from the ridge line portion 19. Furthermore, since the upper end surface 17 of the convex portion 13 has higher wettability with respect to the droplet 18 than the side surface 15, the droplet 18 is positioned on the upper end surface 17 in a stable state.

  FIG. 11 is a cross-sectional view showing a third manufacturing process of the display filter 10 in the case where a foreign substance 21 such as dust adheres to the tip of the discharge part 20a. As shown in FIG. 11, when the foreign matter 21 is attached to the distal end portion of the discharge portion 20 a, the foreign matter 21 prevents the droplet 18 discharged from the discharge portion 20 a from traveling. For this reason, the liquid droplet 18 does not travel toward the upper end surface 17 of the convex portion 13 positioned directly below the discharge portion 20a, but travels in a direction inclined from the direction immediately below the tip portion of the discharge portion 20a.

  As described above, when the foreign matter 21 is attached to the tip of the discharge portion 20 a, the droplet 18 does not land on the upper end surface 17 of the convex portion 13, and the droplet adheres between the convex portions 13. There is. Even in such a case, since the surface of the substrate 11 located between the side surface 15 of the convex portion 13 and the convex portion 13 has water repellency, the liquid droplet 18 is hardly wetted, and the colored layer 12 is formed between the convex portions 13. It is hard to be done. Further, when the diameter of the droplet 18 discharged from the discharge portion 20a is set to 15 μm or more and 20 μm or less by setting the opening diameter of the tip portion of the discharge portion 20a to 15 μm or more and 20 μm or less, the droplet 18 is formed on the upper end surface 17. Drops well. Further, when the diameter of the droplet 18 discharged from the discharge unit 20a is 15 μm or more and 20 μm or less, occurrence of nozzle clogging in the discharge unit 20a is suppressed, and the frequency of maintenance is reduced.

  Table 1 below is a table showing the results of observing the landing state of the droplets 18 with respect to the convex portions 13 having various width dimensions of the upper end surface 17. Whether the droplet 18 has entered the upper end surface 17 is visually determined. Specifically, a person with a visual acuity of 1.0 makes a determination in a state where the display filter 10 is illuminated from the back surface using a 30 W white fluorescent lamp as a light source. For example, when analysis is performed by a method other than visual observation, such as spectrophotometer measurement, the component of the droplet 18 is also detected from the side surface 15 of the convex portion 13, and it is difficult to determine the landing state of the droplet 18 It becomes. The size of the droplet 18 includes a method of directly measuring and a method of calculating the size from the density of the droplet 18 by discharging 1000 to 10,000 droplets and measuring the weight thereof. In the measurement of Table 1, a method of directly measuring the size of the droplet 18 is used.

  As shown in Table 1, when the width of the upper end surface 17 of the convex portion 13 is 30 μm or more, the droplet 18 does not enter between the convex portions 13 and the droplet 18 is dropped on the upper end surface 17. When the upper end surface is 10 μm or less, the droplet 18 enters between the convex portions 13.

  Table 2 below shows the observation results indicating whether or not the droplet 18 has landed between the convex portions 13 when the width of the upper end surface 17 of the convex portion 13 is 10 μm and the size of the droplet 18 to be dropped is changed. is there.

  As shown in Table 2, when the diameter of the dropped liquid droplet 18 is smaller than the width of the upper end surface 17 of the convex portion 13, the droplet 18 does not enter between the convex portions 13. .

  Table 3 below shows that, in Table 1, when the liquid droplet 18 does not enter between the convex portions 13, the liquid droplet 18 is disposed between the convex portions 13 when the liquid droplet 18 is removed from the central portion of the upper end surface of the convex portion 13. It is the result of observing whether or not it enters. The width of the upper end surface 17 of the convex portion 13 is 30 μm, and the size of the droplet 18 is measured with a diameter of 15 μm.

  As shown in Table 3, when the droplet 18 protrudes from the width of the upper end surface 17, the droplet 18 enters between the convex portions 13.

  As organic materials, acrylic, nylon, polypropylene, PET, ABS, polystyrene, polycarbonate, polysulfone, Teflon (registered trademark), and Al, ITO, Ti, W, Ta, Si, SiO2, and SiN are tested in addition to organic materials. As a result, whether or not the droplet 18 enters between the convex portions 13 was the same as the results shown in Tables 1 to 3 above. Acrylic resin is the best when judged from applicability, insulation, and transparency. Further, when the height of the convex portion 13 was changed in various ways, whether or not the droplet 18 entered between the convex portions 13 was the same as the results shown in Tables 1 to 3 above.

  As described above, after applying the droplet 18 to the upper end surface 17 of the convex portion 13, the solvent of the droplet 18 is evaporated to form the colored layer 12 on the upper end surface 17 of the convex portion 13. At this time, the droplet 18 is heated by a heating unit (not shown), or the droplet 18 is dried by a drying unit (not shown), thereby quickly drying the solvent of the droplet 18. And the display filter 10 provided with the board | substrate 11, the some convex part 13 formed on the surface of the board | substrate 11, and the colored layer 12 formed in the upper end surface 17 of this convex part 13 is formed.

  In the present embodiment, the convex portion 13 is formed directly on the surface of the substrate 11, but is not limited thereto. For example, the wiring pattern 31 may be formed on the upper surface of the substrate 11, and the convex portion 13 may be formed on the upper surface of the wiring pattern 31. FIG. 12 is a sectional view of a substrate 40 with a TFT liquid crystal wiring pattern. The substrate 40 with a TFT liquid crystal wiring pattern includes a substrate 11, a wiring pattern 31 formed on the surface of the substrate 11, and the wiring. And a convex portion 13 formed on the upper surface of the pattern 31.

  Thus, even when the convex portion 13 is formed on the upper surface of the wiring pattern 31, the droplet 18 can be satisfactorily applied on the upper surface of the convex portion 13. For this reason, a colored layer can be directly formed on a TFT formation surface panel including the substrate 11 and the wiring pattern 31. In addition, the convex part 13 functions as what electrically insulates the transistor and electric wiring and each element electrode which are used in a TFT liquid crystal manufacturing process.

  FIG. 13 is a cross-sectional view of the color filter 41 used for the TFT liquid crystal. As shown in FIG. 13, the color filter 41 used for the TFT liquid crystal includes the substrate 11, the convex portion 13 formed on the surface of the substrate 11, and the coloring formed on the upper end surface 17 of the convex portion 13. A layer 12 and a transparent electrode 42 formed on the upper surface of the colored layer 12 are provided. The transparent electrode 42 is formed on the upper surface of the colored layer 12 by an inkjet method. The transparent electrode 42 may be formed by a photolithography method in which ITO is formed by sputtering and etching is performed. The transparent electrode 42 is a member that functions when displaying an image.

  FIG. 14 is a cross-sectional view of the plasma panel display 43 with a wiring pattern.

  As shown in FIG. 14, the plasma panel display 43 includes a substrate 11, an electrode 44 formed on the surface of the substrate 11, and a convex portion 13 formed on the upper surface of the electrode 44. Yes. The product life of the plasma panel display 43 can be extended by subjecting the convex portion 13 to UV resistance. Even when the convex portion 13 is formed on the upper surface of the wiring 44, the droplet 18 can be satisfactorily applied to the upper end surface 17 of the convex portion 13.

  In the display filter 10 configured as described above, the convex portion 13 and the substrate 11 are configured independently of each other. Therefore, the convex portion 13 is formed according to the material of the droplet 18 applied to the upper end surface 17. The constituent material can be selected. In particular, the convex portion 13 is formed integrally with the substrate 11 by using an organic material or the like having a larger contact angle with the droplet 18 than the glass mainly composed of silicon dioxide constituting the substrate 11. More droplets 18 can be accumulated on the upper end surface 17 than the display filter.

  Further, since the contact angle between the side surface 15 of the convex portion 13 and the droplet 18 is larger than the contact angle between the upper end surface 17 of the convex portion 13 and the droplet 18, the droplet 18 dropped on the upper end surface 17 is the ridge line portion. It is difficult to hang over 19 and the occurrence of color mixing can be suppressed. In addition, the surface of the substrate 11 located between the protrusions 13 has water repellency with respect to the droplets 18, so that even when the droplets 18 enter between the protrusions 13, the droplets 18 are on the substrate 11. The colored layer 12 is suppressed from being formed between the convex portions 13.

  Furthermore, as shown in FIG. 3, when the side surface 15 of the convex portion 13 is formed so as to decrease in height as it is separated from the upper end surface 17 in the horizontal direction, the convex portion 13 extends. When forming a wiring extending in a direction intersecting with the direction in which the wiring is formed, it is possible to prevent the formed wiring from being disconnected. Further, as shown in FIG. 4, even when the curved surface 30 is formed on the outer peripheral edge portion of the upper end surface 17 of the convex portion 13, the direction in which the convex portion 13 extends on the upper surface of the convex portion 13 When forming wirings or the like in the intersecting direction, disconnection of the formed wirings can be suppressed.

  Further, even if the convex portion 13 is not formed on the surface of the substrate 11, the droplet 18 can be satisfactorily dropped on the upper end surface 17, so that wiring or the like is formed on the surface of the substrate 11. In the plasma panel display 43, the color filter 41 used in the TFT liquid layer, the substrate 40 with the TFT liquid crystal wiring pattern, and the like, the colored layer 12 can be formed on the upper end surface 17 of the convex portion 13. In addition, the product life of the display filter 10 and the like can be improved by subjecting the convex portion 13 to ultraviolet ray resistance treatment.

  Although the embodiments of the present invention have been described as above, the embodiments disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is suitable for a display filter.

It is a perspective view of the filter for display of an embodiment concerning the present invention. It is sectional drawing in the II-II line of FIG. It is sectional drawing of the 1st modification of the convex part shown by FIG. It is sectional drawing of the 2nd modification of the convex part shown by FIG. It is the perspective view which showed the 1st manufacturing process among the manufacturing processes of the filter for a display. It is sectional drawing which showed the 2nd manufacturing process among the manufacturing processes of the filter for a display. It is sectional drawing which showed the process of forming a convex part on a board | substrate by photolithography. It is sectional drawing which showed the process of cutting a surface layer with a blade part, and forming a convex part. It is sectional drawing which showed the 3rd manufacturing process among the manufacturing processes of the filter for a display. It is an expanded sectional view of a convex part. It is sectional drawing which showed the 3rd manufacturing process of the display filter when foreign materials, such as dust, adhered to the front-end | tip part of a discharge part. It is sectional drawing of the board | substrate with a wiring pattern of TFT liquid crystal. It is sectional drawing of the color filter used for TFT liquid crystal. It is sectional drawing with a pattern of a plasma panel display.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Display filter, 11 Board | substrate, 12 Colored layer, 13 Convex part, 15 Side surface, 17 Upper end surface, 18 Droplet, 19 Edge part, 20 Inkjet, 20a Discharge part, 23 Surface layer, 24 Optical energy, 25 Laser emission part , 26 mask, 30 curved surface.

Claims (13)

A substrate,
A convex portion formed on the substrate;
A colored layer formed on the upper end surface of the convex portion and formed by evaporating the solvent of the colored droplets;
With
The projection is a display filter formed of a material having a contact angle with the droplet larger than that of the substrate.   The display filter according to claim 1, wherein the substrate is made of glass containing silicon dioxide as a main component, and at least a tip portion of the convex portion is made of an organic material.   The display filter according to claim 1, wherein a contact angle between a side surface of the convex portion and the droplet is larger than a contact angle between an upper end surface of the convex portion and the droplet.   The display filter according to any one of claims 1 to 3, wherein an outer peripheral edge portion of the upper end surface of the convex portion is formed in a curved surface shape.   The display filter according to any one of claims 1 to 4, further comprising a side surface that is inclined so that the height decreases as the distance from the upper end surface of the convex portion increases in the horizontal direction. Further comprising a wiring formed on the substrate,
The display filter according to claim 1, wherein the convex portion is formed on the wiring.   The display filter according to any one of claims 1 to 6, wherein the convex portion is subjected to an ultraviolet resistant treatment.   The display filter according to claim 1, further comprising a transparent electrode formed on an upper surface of the colored layer. Forming a surface film made of a material having a contact angle larger than that of the substrate on the substrate;
Forming a projection on the substrate by patterning the surface film; and
A method for manufacturing a display filter comprising:   The method for manufacturing a display filter according to claim 9, wherein the surface film is an organic material film.   The method for manufacturing a display filter according to claim 10, wherein the convex portion is formed by photolithography.   The manufacturing method of the display filter according to claim 10, wherein the projection is formed by irradiating the organic material film with a laser beam. The manufacturing method of the display filter according to claim 10, wherein the convex portion is formed by scanning the tip portion of the blade portion that is tapered toward the tip portion within the organic material film.

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