WO2017110077A1

WO2017110077A1 - Reflective display panel and production method therefor

Info

Publication number: WO2017110077A1
Application number: PCT/JP2016/005169
Authority: WO
Inventors: 知子鶴田; 康裕小橋
Original assignee: 凸版印刷株式会社
Priority date: 2015-12-22
Filing date: 2016-12-16
Publication date: 2017-06-29
Also published as: TW201730644A

Abstract

The present invention eliminates color change that is caused by light irradiation and that has been a problem associated with the use of a pigment having a phthalocyanine skeleton when producing a reflective display panel through a process with relatively less load of light and heat, and provides a highly reliable reflective display panel and a method for producing same. The reflective display panel according to the present invention at least has, in this order: a substrate (10); a first electrode layer (11); a reflective display layer (13); a second electrode layer (14); a base material (15); and an ink fixation layer (16), wherein the ink fixation layer (16) has a plurality of coloring parts (17), which are arranged in correspondence to drive units of the first electrode layer (11), and all or part of the plurality of the coloring parts (17) contain a pigment having a phthalocyanine skeleton and a binder resin not having an amino group within the molecular skeleton thereof.

Description

Reflective display panel and manufacturing method thereof

The present invention relates to a reflective display panel and a manufacturing method thereof.

In recent years, a liquid crystal display panel using a backlight as an image display panel has been mainstream, but it is not suitable for an application in which the eye is burdened and it is viewed for a long time.

As a display device with a small burden on the eyes, a reflective display panel having a reflective display layer between a pair of electrodes has been proposed. Since this reflective display panel displays characters and images by reflected light, similar to a printed paper, it is light on the eyes and is suitable for work that keeps watching the screen for a long time.

At present, reflection type display panels are mainly two-color display mainly for monochrome display due to their structure. Recently, however, a color filter composed of pixels of three primary colors of red, green, and blue is provided on a reflection type display layer. There has been proposed a display device which is provided and performs multicolor display (see Patent Document 1).

On the other hand, since a reflective display panel displays using external light, there are restrictions on the brightness (brightness) of the panel, and in particular, each pixel has a colored portion of three primary colors of red, green, and blue. When a multi-color display is provided with a color filter, there is a problem that the brightness decrease due to the color filter becomes noticeable and the visibility deteriorates. Further higher brightness, higher color reproducibility, higher contrast, etc. are desired. Yes.

In response to this problem, there is an attempt to secure visibility by placing artificial lighting in the vicinity of the display device and increasing the amount of light in the outside world. However, such an attempt can result in the loss of the great feature of low power consumption of the reflective display device that uses power only when the display of the reflective display device is changed.

Other than the above, there is an attempt to improve visibility by increasing the brightness of the colored portion of the color filter. Specifically, in recent years, a green colored portion constituting a color filter is formed by using a conventional copper halide phthalocyanine pigment (for example, CI Pigment Green 36 made of brominated copper phthalocyanine pigment or chlorine as a main pigment. Zinc halide phthalocyanine pigments (for example, CI Pigment Green 58) have come to be used instead of CI Pigment Green 7 and the like made of copper halide phthalocyanine pigments.

However, zinc halide phthalocyanine is an excellent colorant and at the same time known as an organic semiconductor, and is known to stabilize as a phthalocyanine radical by light irradiation under deaeration (patent) Documents 2 and 3) are serious problems when zinc halide phthalocyanine is used as a colorant. That is, the absorption wavelength of the phthalocyanine radical deviates from the absorption wavelength of the phthalocyanine in the ground state, so that when used as a colorant, the color appears to change. This phenomenon is particularly apparent when it is used in a state of being completely cut off from air, such as a liquid crystal display device or a reflective display panel, and improvement is desired.

As an attempt to solve a phenomenon similar to this, it has been proposed to contain a compound selected from nitrosonaphthols and benzophenone (Patent Document 4). However, this technology is assumed to be used for color filters by dyeing methods using phthalocyanine complex dyes and pigments, and a pigment dispersion method using a pigment that has been subjected to recent micronization treatment as a colorant, or photolithography. In order to use it for a color filter by a method or an ink jet method, there are many problems to be solved such as dispersibility of pigment, suitability for photolithography, suitability for ink jet.

JP 2003-161964 A Japanese Patent No. 2949230 Japanese Patent No. 2958461 Japanese Patent No. 2661135

The present invention has been made in view of the above circumstances, and has been a problem in using a pigment having a phthalocyanine skeleton in the manufacture of a reflective display panel having a process with a relatively small heat and light load. An object of the present invention is to provide a highly reliable reflective display panel and a method for manufacturing the same, which eliminates color change due to irradiation.

One aspect of the present invention for solving the above problems is a reflective display panel having at least a substrate, a first electrode layer, a reflective display layer, a second electrode layer, a base material, and an ink fixing layer in this order. And a pigment and a molecular skeleton in which the ink fixing layer has a plurality of colored portions, the colored portions are arranged corresponding to the driving unit of the first electrode layer, and all or a part of the plurality of colored portions has a phthalocyanine skeleton. A reflective display panel containing a binder resin having no amino group therein.

Further, the binder resin may be one or more resins selected from the group consisting of acrylic resins, epoxy resins, and phenol resins.

Also, pigments having a phthalocyanine skeleton are C.I. I. Pigment Green 7, 36, 58, 59, or at least two of these may be included.

The mass average molecular weight of the binder resin may be 200 or more and 10,000 or less.

Further, the mass ratio of the pigment having a phthalocyanine skeleton and the binder resin in the colored part may be 1: 9 or more and 1: 1 or less.

Further, the ratio of the area occupied by the colored portion in the display unit of the reflective display layer corresponding to the driving unit of the first electrode layer may be 25% or more and 99% or less.

Another aspect of the present invention is a method for manufacturing a reflective display panel as described above, which includes a step of forming a colored portion by an inkjet method.

Alternatively, the above-described reflective display panel manufacturing method includes a step of forming the colored portion by drying at a temperature below the glass transition point of the substrate.

According to the present invention, in the production of a reflective display panel having a process with relatively little heat and light load, the color change due to light irradiation, which has been a problem when using a pigment having a phthalocyanine skeleton, is eliminated and reliability is improved. It is possible to provide a reflective display panel with high brightness.

FIG. 1 is a cross-sectional view of a reflective display panel according to an embodiment of the present invention. FIG. 2 is a plan view of the ink fixing layer of the reflective display panel according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail.

FIG. 1 is a cross-sectional view of a reflective display panel 100 according to an embodiment of the present invention. FIG. 2 is a plan view of an ink fixing layer of the reflective display panel 100 according to an embodiment of the present invention.

In the reflective display panel 100 shown in FIG. 1, a first electrode layer 11 is formed on a substrate 10, and a reflective display layer 13 is formed on the first electrode layer 11 via an adhesive layer 12. In the first electrode layer 11, a plurality of pixel electrodes are arranged, each pixel electrode is connected to a switching element, and a positive and negative voltage can be applied between the first electrode layer 11 and the second electrode layer 14.

On the reflective display layer 13, a second electrode layer 14, a base material 15, an ink fixing layer 16, and a protective film 18 are sequentially laminated. The ink fixing layer 16 has a plurality of colored portions 17 arranged to face the drive unit of the first electrode layer 11. All or some of the plurality of colored portions 17 contain, for example, a pigment having a phthalocyanine skeleton.

The reflective display layer 13 can be applied to a reflective liquid crystal, a cholesteric liquid crystal, an electrophoretic method (such as a microcapsule method), a microcup method, or an electrochromic method. The base material 15 should just be light transmittance, and can also use glass base materials, film base materials, such as a PET film and a PEN film.

The ink fixing layer 16 having the colored portion 17 can be formed by photolithography of a colored resist film as is done in a color filter for a liquid crystal display device, but a reflective display panel as in this embodiment. In the case of the ink fixing layer 16 having the colored portion 17 used for 100, the colored portion 17 can be formed by forming the ink fixing layer 16 and applying a plurality of inks to the ink fixing layer 16. The ink fixing layer 16 is formed by applying an ink fixing layer forming coating liquid containing a resin.

As the ink fixing layer 16, urethane resin, polyester, acrylic resin, vinyl alcohol resin, or the like can be used. Further, the ink fixing layer 16 may contain a porous material such as synthetic silica or alumina in order to increase the absorbability of the ink solvent. The ink fixing layer 16 can be formed by a screen printing method, an offset printing method, a spin coating method, or intermittent coating with a die if sheet processing is performed. Further, if continuous processing is performed by roll-to-roll, the ink fixing layer 16 can be formed by a general application technique such as die coating, comma coating, curtain coating, and gravure coating. In addition, the coating liquid for forming an ink fixing layer after coating is dried. As a drying method, heating, air blowing, reduced pressure, etc. can be used, but a drying step at a temperature below the glass transition point of the substrate 10 so as to be compatible with a substrate 10 such as PET that is not resistant to heat compared to glass. Is preferably applied. Thereby, the deformation | transformation etc. of the board | substrate 10 by a heat | fever can also be prevented.

As an ink application method for forming the colored portion 17 on the ink fixing layer 16, a black matrix for dividing the drive unit is not formed, and therefore, it is necessary to apply colors separately. For this reason, a screen printing method, an offset printing method, an inkjet printing method, etc. can be used. In particular, since the alignment is easy and the productivity is high, it is preferable to form the colored portion 17 by ejecting ink to the ink fixing layer 16 using an ink jet printing method. In addition, the coated ink is dried. As a drying method, heating, air blowing, reduced pressure, etc. can be used, but a drying step at a temperature below the glass transition point of the substrate 10 so as to be compatible with a substrate 10 such as PET that is not resistant to heat compared to glass. Is preferably applied. Thereby, the deformation | transformation etc. of the board | substrate 10 by a heat | fever can also be prevented. Furthermore, if the drying is insufficient, the color change due to light irradiation of phthalocyanine is accelerated by the solvent in the ink acting as a catalyst, so that sufficient drying can be achieved even at a temperature below the glass transition point of the substrate 10. It is preferable to use vacuum drying that can be performed.

As an apparatus used for the ink jet printing method, there are a piezo conversion method and a heat conversion method depending on a difference in an ink discharge method, and it is desirable to use a piezo conversion method apparatus. In addition, the ink atomization frequency of the ink jet apparatus is desirably about 5 kHz to 100 kHz. In addition, the nozzle diameter of the ink jet apparatus is desirably about 5 to 80 μm. In addition, it is preferable to use an inkjet apparatus in which a plurality of heads are arranged and about 60 to 500 nozzles are incorporated in one head.

The ink for the colored portion 17 is formed by a colorant, a solvent, a binder resin, and a dispersant.

As the colorant, in recent years, among organic pigments used for the colorant of the green color portion in the color filter, a vivid and bright color can be realized, so that a zinc halide phthalocyanine pigment, C.I. I. Pigment Green 58 (PG58) has come to be widely used. However, as described in detail in the background art section, since the pigment has photoreactivity, when used as a green colored portion of a color filter, when incorporated in a reflective display device in which air is blocked, The color had changed due to the photoreactivity. In particular, when the pigment particle size is reduced in order to improve the contrast, the tendency becomes conspicuous. Therefore, it has been difficult to ensure the light resistance of the color filter having a green colored portion containing PG58.

Therefore, it was presumed that the cause of the color change of the green colored portion was a phthalocyanine radical anion generated by light, and countermeasures were examined. That is, it has been found that the light resistance of the green colored portion is drastically improved by containing a binder resin that does not promote the generation of phthalocyanine radical anions and by selecting a green pigment that suppresses the generation of phthalocyanine radical anions.

Therefore, a pigment having a phthalocyanine skeleton of a colorant contained in the green coloring portion 17 that can be preferably used in the present invention is a halogenated copper phthalocyanine pigment (for example, CI Pigment Green made of brominated copper phthalocyanine pigment). 36, CI Pigment Green 7 and the like made of chlorinated copper phthalocyanine pigment), and zinc halide phthalocyanine pigment (for example, CI Pigment Green 58 and the like). Furthermore, it is more preferable to use a halogenated copper phthalocyanine pigment having a short excited state by light irradiation and higher photostability.

As the coloring material of the ink other than the pigment having a phthalocyanine skeleton used in the present invention, any coloring matter can be used regardless of organic pigments, inorganic pigments, dyes and the like. Preferably, an organic pigment is used, and it is particularly preferable to use a pigment excellent in light resistance. Specifically, C.I. I. Pigment Red 9, 19, 38, 43, 97, 122, 123, 144, 149, 166, 168, 177, 179, 180, 192, 208, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 254, Pigment Blue 15, 15: 3, 15: 6, 16, 22, 29, 60, 64, C.I. I. Pigment Green 7, 36, 56, 58, 59, C.I. I. Pigment Yellow 20, 24, 86, 81, 83, 93, 108, 109, 110, 117, 125, 137, 138, 139, 147, 148, 150, 153, 154, 166, 168, 185, C.I. I. Pigment Orange 36, 73, C.I. I. Pigment Violet 23 or the like can be used. Furthermore, in order to obtain a desired hue, two or more kinds of materials can be mixed and used.

The solvent used in the ink of the present invention is preferably a solvent having a surface tension of 35 mN / m or less and a boiling point of 130 ° C. or higher in consideration of suitability for inkjet printing. When the surface tension is greater than 35 mN / m, the dot shape stability during ink jet ejection is significantly adversely affected. When the boiling point is less than 130 ° C., the drying property near the nozzle is remarkably increased, resulting in nozzle clogging. It tends to cause defects such as.

Specifically, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, 2-ethoxyethyl acetate, 2-butoxyethyl acetate, 2-methoxyethyl acetate, 2-ethoxyethyl ether, 2- (2-ethoxy And ethoxy) ethanol, 2- (2-butoxyethoxy) ethanol, 2- (2-ethoxyethoxy) ethyl acetate, 2- (2-butoxyethoxy) ethyl acetate, 2-phenoxyethanol, and diethylene glycol dimethyl ether. The solvent is not limited to these and can be preferably used as long as it satisfies the above-mentioned requirements. Two or more kinds of solvents may be mixed and used as necessary.

As the binder resin that can be used in the present invention, a binder resin having no amino group in a molecular skeleton that does not promote generation of a phthalocyanine radical anion that causes a color change due to light irradiation can be used. Examples of such binder resins include acrylic resins, epoxy resins, phenolic resins, and the like, or resins containing one or more of these. Here, binder resins having amino groups in the molecular skeleton, such as melamine resin, urea resin, and guanamine resin, are not preferable because they promote color change due to light irradiation.

As acrylic resins, (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, benzyl (meth) acrylate, lauryl as monomers Alkyl (meth) acrylates such as (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, ethoxyethyl (meth) acrylate, glycidyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) Polymers such as alicyclic (meth) acrylates such as acrylate and dicyclopentenyl (meth) acrylate are exemplified, but the invention is not limited thereto. These monomers can be used alone or in combination of two or more. Furthermore, compounds such as styrene, cyclohexylmaleimide, phenylmaleimide, cyclohexylmaleimide, phenylmaleimide, methylmaleimide, ethylmaleimide, n-butylmaleimide, and laurylmaleimide that can be copolymerized with these acrylates can also be copolymerized.

Also, an ethylenically unsaturated group can be added to the acrylic resin. As a method of adding an ethylenically unsaturated group to an acrylic resin, a method of adding an ethylenically unsaturated group such as acrylic acid and a carboxylic acid-containing compound to an epoxy-containing resin such as glycidyl methacrylate, or a carboxylic acid such as methacrylic acid Examples include a method of adding an epoxide-containing acrylate such as glycidyl methacrylate to a containing resin, and a method of adding an isocyanate group-containing acrylate such as methacryloyloxyethyl isocyanate to a hydroxyl group-containing resin such as hydroxymethacrylate. It is not limited to.

Examples of the epoxy resin include glycerol / polyglycidyl ether, trimethylolpropane / polyglycidyl ether, resorcin / diglycidyl ether, neopentyl glycol / diglycidyl ether, 1,6-hexanediol / diglycidyl ether, ethylene glycol (polyethylene). Glycol) and diglycidyl ether. Also about these, it can use individually or in mixture of 2 or more types.

Examples of phenolic resins include novolak resins and resol resins.

Further, the mass average molecular weight of the binder resin is preferably in the range of 200 or more and 10,000 or less, and more preferably in the range of 300 or more and 8,000 or less. When the mass average molecular weight of the binder resin exceeds 10,000, the fluidity of the ink is insufficient during the drying process of the colored portion 16, and the pattern flatness is inferior. Further, if the mass average molecular weight of the binder resin is less than 300, required physical properties such as solvent resistance and heat resistance cannot be satisfied.

The dispersant can be used to improve the dispersibility of the pigment in the solvent. As the dispersant, an ionic or nonionic surfactant can be used. Specific examples include sodium alkylbenzene sulfonate, poly fatty acid salts, fatty acid salt alkyl phosphates, tetraalkyl ammonium salts, polyoxyethylene alkyl ethers, and the like, and other examples include organic pigment derivatives and polyesters. One type of dispersant may be used alone, or two or more types of dispersants may be mixed and used as necessary.

The viscosity of the ink used for the colored portion 17 is preferably in the range of 1 mPa · s to 20 mPa · s, and more preferably in the range of 5 mPa · s to 15 mPa · s. When the viscosity of the ink exceeds 20 mPa · s, there is a tendency that the ink does not land at a predetermined position at the time of ink jet ejection, or a defect such as nozzle clogging. On the other hand, when the viscosity of the ink is less than 1 mPa · s, the ink tends to be scattered when ejected.

Further, the mass ratio of the pigment or dye and the binder resin in the colored portion 17 is preferably in the range of 1: 9 to 1: 1, and the fluidity of the ink is adjusted by changing the amount of resin in the ink. In addition, the density variation in the colored portion 17 can be improved.

Here, since the reflective display panel is generally used as a display medium using external light, the transmissive display panel represented by a liquid crystal display has a hue and density required for the colored portion. Each color density tends to be small and the color gamut tends to be small compared to the colored portion.

Therefore, the pigment that is a coloring component contained in the ink inevitably tends to decrease, but if the amount of resin is more than 90% with respect to the pigment, the amount of liquid required increases, and further, due to the addition of resin. The fluidity of the ink is inferior due to the increase in viscosity, and the colored portion formed has a darker center at the colored portion than at the periphery of the colored portion.

On the other hand, when the resin amount is less than 50% with respect to the pigment, the coloring component contained in the ink is relatively increased and the color density is increased. Therefore, the pigment is diluted with a solvent (volatile matter) or a small amount As a result, it is necessary to form the colored portion with the amount of liquid droplets. As a result, when diluted with a solvent (volatile matter), the fluidity of the ink is large and the amount of ink dripping is also large. In the case where the periphery of the colored portion 17 becomes dark and the colored portion 17 is formed with a small amount of droplets, the interval between the ink droplets becomes wide, and a suitable colored portion 17 cannot be formed due to a gap.

Next, the color display of the reflective display panel 100 based on the operating principle will be described. The reflective display panel 100 includes, for example, a colored portion 17 and a non-colored portion (transparent portion) disposed on the reflective display layer 13 that displays white and black, facing the drive unit of the first electrode layer 11. Have. In this case, the reflective display layer 13 may be a reflective display medium that displays white and black, and the display method of the display medium is not limited.

When all the portions of the reflective display layer 13 facing the drive unit of the first electrode layer 11 are displayed in white, or when only the portions corresponding to the colored portions 17 of the reflective display layer 13 are displayed in white, the colored portions 17 When the color of the non-colored portion and white or black of the non-colored portion are mixed, a color similar to the hue of the colored portion 17 is displayed, and only the portion of the reflective display layer 13 with respect to the colored portion 17 is displayed in black, Since only the light transmitted through the colored portion is reflected, white display is obtained, and when all the portions of the reflective display layer 13 facing the drive unit of the first electrode layer 11 are displayed in black, all the light is reflected. Without displaying black.

At this time, the color combination of the colored portion 17 can be freely changed depending on the application. In the case of multi-color display, a combination of two colors such as red and cyan, magenta and green, yellow and blue, etc. that have a complementary color relationship can be used. Any combination of colors can be used as long as they are in a complementary color relationship that becomes white by color mixing. In general, three colors of red, green, and blue, or three colors of cyan, magenta, and yellow are used for full-color display. If it is the combination of the color which becomes, it will not specifically limit. In the case of monocolor display, a desired color such as red, blue, magenta or the like can be used. In the present invention, the present invention can be particularly preferably applied to a colored portion having a green color which is the hue of a pigment having a phthalocyanine skeleton.

Further, the colored portion 17 arranged to face the drive unit of the first electrode layer 11 may be an isotropically divided arrangement, and is not particularly limited. As shown in FIG. 2, the ratio of the area occupied by the colored portion 17 in the display unit 19 of the reflective display layer 13 corresponding to the driving unit of the first electrode layer 11 is 25% or more and 99% or less. preferable. When the colored portion area ratio is small (the area ratio of the colored portion 17 is less than 25%), the vividness when displaying each color is inferior, and the contrast (darkness ratio) between white / black display and each colored display cannot be obtained. When the colored portion area ratio is large (over 99% in the colored portion 17 area ratio), the colored portions 17 in the ink jet method tend to come into contact with each other, which may cause defects such as color mixing.

Hereinafter, examples and comparative examples of the present invention will be described, but the present invention is not limited to these examples.

(Example 1)

An indium tin oxide (ITO) as the second electrode layer 14 and an electrophoretic display medium as the reflective display layer 13 were sequentially formed on the base material 15 made of a PET base material. Next, the 1st electrode layer 11 was formed on the board | substrate 10 which consists of glass, and the 1st electrode layer 11 and the reflective display layer 13 were bonded together through the contact bonding layer 12. FIG. On the bonded base material 15, a polyester resin-based receiving liquid NS-141LX (Takamatsu Yushi Co., Ltd.) is continuously applied using a comma coater, and then dried with a vacuum dryer for 5 minutes. An ink fixing layer 16 having an average film thickness of 10 μm was formed.

Next, a colorant dispersion was prepared. As pigments to be colored contained in the colorant used in the coloring part 17, those shown in Table 1 were used. In the formulation shown in Table 1, the pigment was sufficiently mixed and kneaded by bead mill dispersion to prepare a pigment dispersion.

To the dispersion thus obtained, an epoxy resin (jER-1001, manufactured by Mitsubishi Chemical Corporation) as a binder resin and diethylene glycol monoethyl ether acetate as an organic solvent were added and stirred well to obtain the green ink shown in Table 2. Produced.

Next, the ink of the coloring material is applied to the ink fixing layer 16 at a predetermined position using an ink jet printing apparatus equipped with a 12 pl, 180 dpi (180 dots per 2.54 cm) head (manufactured by Seiko Instruments Inc.). did. Then, it was made to dry for 5 minutes with a vacuum dryer, and the colored part 17 and the non-colored part were formed.

Finally, a protective film 18 was formed thereon to produce a reflective display device having a green colored portion.
(Examples 2 and 3, Comparative Examples 1 to 3)

In the same manner as in Example 1, reflection type display devices having green colored portions of Examples 2 and 3 and Comparative Examples 1 to 3 were prepared by using the combination of the green pigment and the binder resin shown in Table 3.

(Light resistance evaluation)
The produced reflective display device was irradiated with a xenon weather meter Ci35A (manufactured by ALTAS) for 168 hours under the conditions of an illuminance of 0.5 mW / cm ² (340 nm) and a temperature of 40 ° C., and the spectral characteristics before and after irradiation were microscopically observed. The light resistance was evaluated by measuring with a spectrophotometer OSP-SP100 (Olympus Optical Co., Ltd.), obtaining the color difference (ΔE * ab), and observing the appearance after the test with a microscope. The criteria for light resistance evaluation were “+”: ΔE * ab ≦ 3 and “−”: ΔE * ab> 3.

From the results shown in Table 3, the following is clear. That is, in a reflective display device having a colored portion using a pigment having a phthalocyanine skeleton, light resistance is improved by containing a resin having no amino group in the molecular skeleton that does not promote the generation of phthalocyanine radical anions. I understand that. It can also be seen that light resistance is improved by using copper phthalocyanine rather than zinc halide phthalocyanine.

On the other hand, in Comparative Examples 1 to 3 containing a resin having an amino group in the molecular skeleton, the light resistance deteriorated. Further, among them, Comparative Example 2 using a halogenated zinc phthalocyanine having low light stability was much worse in light resistance.

As described above, by adding a pigment having a phthalocyanine skeleton in the colored part and a binder resin having no amino group in the molecular skeleton, it becomes a colored part having excellent light resistance and excellent reliability even under oxygen interruption. A reflective display panel can be obtained.

The present invention is applicable to a reflective display device.

DESCRIPTION OF SYMBOLS 10 Board | substrate 11 1st electrode layer 12 Adhesive layer 13 Reflective display layer 14 2nd electrode layer 15 Base material 16 Ink fixing layer 17 Coloring part 18 Protective film 19 Display unit of reflective display layer 100 Reflective display panel

Claims

A reflective display panel having at least a substrate, a first electrode layer, a reflective display layer, a second electrode layer, a substrate, and an ink fixing layer in this order,
The ink fixing layer has a plurality of colored portions;
The colored portion is arranged corresponding to the driving unit of the first electrode layer,
A reflective display panel, wherein all or part of the plurality of colored portions contains a pigment having a phthalocyanine skeleton and a binder resin having no amino group in the molecular skeleton.
The reflective display panel according to claim 1, wherein the binder resin is one or more resins selected from the group consisting of an acrylic resin, an epoxy resin, and a phenol resin.
The pigment having the phthalocyanine skeleton is C.I. I. The reflective display panel according to claim 1 or 2, comprising any one of Pigment Green 7, 36, 58 and 59, or at least two of these.
The reflective display panel according to any one of claims 1 to 3, wherein the binder resin has a mass average molecular weight of 200 or more and 10,000 or less.
5. The reflective display panel according to claim 1, wherein the mass ratio of the dye or pigment contained in the colored portion and the binder resin is 1: 9 to 1: 1.
6. The reflective display panel according to claim 1, wherein a mass ratio of the pigment having the phthalocyanine skeleton and the binder resin in the colored portion is 1: 9 to 1: 1.
The ratio of the area which the said coloring part occupies in the display unit of the said reflective display layer according to the drive unit of the said 1st electrode layer is 25% or more and 99% or less, The any one of Claims 1 thru | or 6. Reflective display panel.
It is a manufacturing method of the reflection type display panel of any one of Claims 1 thru | or 7, Comprising:
A method for manufacturing a reflective display panel, comprising a step of forming the colored portion by an inkjet method.
It is a manufacturing method of the reflection type display panel of any one of Claims 1 thru | or 7, Comprising:
The manufacturing method of a reflective display panel including the process of drying and forming the said coloring part at the temperature below the glass transition point of the said board | substrate.