Composition for black matrix, display device, method for preparing composition, and electronic device

Abstract

A composition for a black matrix, a display device, a method for preparing the composition, and an electronic device are provided. A composition for a black matrix includes a base resin, a regenerated carbon black, a polymeric dispersant having an amine value and an acid value of about 5 mgKOH / g or more, respectively, and a curing agent having three or more functional groups.

Description

Technical Field

[0001] The present disclosure relates to a composition for a black matrix, a black matrix including the composition, and a display device including the black matrix. Background Art

[0002] A display device is a device that displays an image using an organic light-emitting element or a liquid crystal element. The display device has been applied to TVs, monitors, notebook computers, tablet PCs, and mobile phones.

[0003] A display device may include a window for protecting the display panel. Because mobile phones and tablet PCs can be used while on the move, rather than being fixed, they are easily exposed to the external environment. Their window function becomes even more important as they are constantly subjected to external forces when touch functionality is added. Ink may be printed on the edge of such a window to form a black matrix within the window. The black matrix may define the non-display area of ​​the display device.

[0004] It is to be understood that this background content of the technology section is intended, in part, to provide a useful background for understanding the technology. However, this background content of the technology section may also include ideas, concepts, or cognitions that are not part of what was known or understood by a person skilled in the relevant art before the corresponding effective filing date of the subject matter disclosed herein. Summary of the Invention

[0005] An object of the present disclosure is to provide a composition for a black matrix in which dispersibility and printability are improved, and a method for preparing the composition for a black matrix.

[0006] Another object of the present disclosure is to provide a display device including a black matrix having improved chemical resistance and abrasion resistance.

[0007] The objects of the present disclosure are not limited to the above-mentioned objects, and additional objects of the present disclosure not mentioned herein will be clearly understood by those skilled in the art through the following description of the present disclosure.

[0008] According to aspects of the present disclosure, there is provided a composition for a black matrix, which may include: a base resin; regenerated carbon black; a polymer dispersant having an amine value and an acid value of about 5 mgKOH / g or greater, respectively; and a curing agent having three or more functional groups.

[0009] In an embodiment, the amine value and the acid value of the polymer dispersant may be approximately 10 mgKOH / g or more and approximately 50 mgKOH / g or less, respectively.

[0010] In an embodiment, the difference between the amine value and the acid value of the polymer dispersant may be about 0.1 mgKOH / g or more and about 20 mgKOH / g or less.

[0011] In embodiments, the polymer dispersant may have a weight average molecular weight of about 4,000 or more and about 25,000 or less.

[0012] In an embodiment, the polymer dispersant may be included in an amount of about 1 part by weight or more and about 10 parts by weight or less based on about 100 parts by weight of the base resin.

[0013] In embodiments, the curing agent may have at least one functional group of an isocyanate group and an amine group.

[0014] In an embodiment, the curing agent may be included in an amount of about 10 parts by weight or more and about 40 parts by weight or less based on about 100 parts by weight of the base resin.

[0015] In embodiments, the regenerated carbon black may include sulfur, zinc, silica, or a combination of sulfur, zinc, and silica.

[0016] In an embodiment, the recycled carbon black may be formed from scrap tires.

[0017] In embodiments, the regenerated carbon black may have an average particle size D50 of about 0.1 μm or more and about 5 μm or less.

[0018] In an embodiment, the base resin may include an acrylic resin, an epoxy resin, or a combination of an acrylic resin and an epoxy resin.

[0019] In an embodiment, the composition may further include: a sensitizer; a curing accelerator; a photosensitizer; a filler; an antioxidant; an ultraviolet absorber; an anti-aggregating agent; a thermal polymerization inhibitor; a defoaming agent; a surfactant; a chain transfer agent; a photoinitiator auxiliary agent; a solvent; or a combination of a sensitizer, a curing accelerator, a photosensitizer, a filler, an antioxidant, an ultraviolet absorber, an anti-aggregating agent, a thermal polymerization inhibitor, a defoaming agent, a surfactant, a chain transfer agent, a photoinitiator auxiliary agent and a solvent.

[0020] According to aspects of the present disclosure, a display device may include: a window; a black matrix disposed on the window; an adhesive layer disposed on the window, the adhesive layer having at least a portion disposed on the black matrix; and a display panel disposed on the adhesive layer, wherein the black matrix may include a base resin, regenerated carbon black, and a polymer dispersant having an amine value and an acid value of approximately 5 mgKOH / g or greater, respectively.

[0021] In embodiments, the regenerated carbon black may include sulfur, zinc, silica, or combinations thereof.

[0022] In an embodiment, the recycled carbon black may be formed from scrap tires.

[0023] In an embodiment, the polymer dispersant may be included in an amount of about 1 part by weight or more and about 10 parts by weight or less based on about 100 parts by weight of the base resin.

[0024] In an embodiment, the black matrix may further include a curing agent having three or more functional groups, and the curing agent may be included in an amount of about 10 parts by weight or more and about 40 parts by weight or less based on about 100 parts by weight of the base resin.

[0025] In an embodiment, the base resin may include an acrylic resin, an epoxy resin, or a combination of an acrylic resin and an epoxy resin.

[0026] According to aspects of the present disclosure, there is provided a method for preparing a composition for a black matrix, the method may include: preparing a first ink, the first ink comprising a base resin, regenerated carbon black, and a polymer dispersant having an amine value and an acid value, each of which is about 5 mgKOH / g or greater; dispersing the first ink; preparing a second ink comprising a curing agent having three or more functional groups; and mixing the first ink with the second ink.

[0027] In an embodiment, mixing the first ink with the second ink may include using about 5 parts by weight or more and about 20 parts by weight or less of the second ink relative to about 100 parts by weight of the first ink.

[0028] According to aspects of the present disclosure, an electronic device includes: a display device configured to provide an image, a processor configured to provide an image data signal to the display device, a memory configured to store data information for operation, and a power module configured to generate power, wherein the display device includes: a window; a black matrix disposed on the window; an adhesive layer disposed on the window, the adhesive layer having at least a portion disposed on the black matrix; and a display panel disposed on the adhesive layer, wherein the black matrix may include a base resin, regenerated carbon black, and a polymer dispersant having an amine value and an acid value of approximately 5 mgKOH / g or greater, respectively.

[0029] The composition for a black matrix according to an embodiment may include an additive capable of dispersing regenerated carbon black to increase dispersibility.

[0030] The display device according to the embodiment may include the composition for a black matrix and the black matrix including a cured product of the composition, thereby improving chemical resistance and wear resistance.

[0031] In addition, recycled carbon black derived from scrap tires can be used to reduce carbon dioxide emissions, and a black matrix including the recycled carbon black can have chemical resistance and abrasion resistance properties that are the same as or greater than those of the chemically synthesized carbon black of the comparative example.

[0032] Effects according to the embodiments of the present disclosure are not limited to the above-mentioned effects, and more various effects are included in the following description of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other aspects and features of the present disclosure will become more apparent by describing in detail embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0034] Figure 1 is a schematic perspective view showing a display device according to an embodiment;

[0035] Figure 2 It is along Figure 1 A schematic cross-sectional view taken along line II';

[0036] Figure 3 is a schematic cross-sectional view showing a display device according to an embodiment;

[0037] Figure 4 is a block diagram of an electronic device according to one embodiment of the present disclosure; and

[0038] Figure 5 is a schematic diagram of an electronic device according to various embodiments of the present disclosure. DETAILED DESCRIPTION

[0039] The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments are shown. However, the present disclosure may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those skilled in the art.

[0040] It will also be understood that when a layer is referred to as being 'on' another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. Like reference numerals refer to like components throughout the specification.

[0041] In the drawings, the sizes, thicknesses, ratios, and dimensions of elements may be exaggerated for the convenience of description and for clarity. Like numbers refer to like elements throughout.

[0042] As used herein, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0043] In the specification and claims, for the purposes of its meaning and interpretation, the term "and / or" is intended to include any combination of the terms "and" and "or." For example, "A and / or B" may be understood to mean "A, B, or A and B." The terms "and" and "or" may be used in either a conjunctive or disjunctive sense and may be understood to be equivalent to "and / or."

[0044] In the specification and claims, for purposes of its meaning and interpretation, the phrase "at least one of" is intended to include the meaning of "at least one selected from the group of..." For example, "at least one of A and B" is understood to mean "A, B, or A and B."

[0045] It will be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first element discussed below can be referred to as the second element without departing from the teachings of the present disclosure. Similarly, the second element can also be referred to as the first element.

[0046] The term "overlap" or "overlapped" means that a first object may be above or below a second object, or the first object may be to the side of the second object, and vice versa. Additionally, the term "overlap" may include layering, stacking, facing, extending over, covering, or partially covering, or any other suitable term as would be appreciated and understood by one of ordinary skill in the art.

[0047] The terms "facing" and "facing" mean that a first element may be directly or indirectly opposite to a second element. In the case where a third element is interposed between the first and second elements, the first and second elements may be understood to be indirectly opposite to each other although still facing each other.

[0048] When an element is described as “not overlapping” or “to not overlap” another element, this may include the elements being spaced apart, offset or separated from each other, or any other suitable terminology as will be appreciated and understood by one of ordinary skill in the art.

[0049] The terms “comprises,” “comprising,” “includes,” and / or “including,” “has,” “have,” and / or “having,” and variations thereof, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0050] As used herein, "about" or "approximately" is inclusive of the stated value and means within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art, taking into account the measurements in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value.

[0051] Unless otherwise defined or implied herein, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will also be understood that, unless expressly defined as such herein, terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

[0052] It will be understood that when an element (or region, layer, portion or the like) is referred to in the specification as being "on," "connected to" or "coupled to" another element, it can be directly disposed on, directly connected or coupled to the other element mentioned above, or intervening elements may be disposed therebetween.

[0053] It will be understood that the terms "connected to" or "coupled to" may include physical or electrical connections or couplings.

[0054] Each of the features of the various embodiments of the present disclosure may be partially or entirely related to each other, and various modifications are possible.

[0055] The chemically synthesized black matrix of the comparative example is produced by incomplete combustion of crude oil or natural gas and is surface-treated to facilitate dispersion, but the recycled carbon black produced by recycling waste tires is not surface-treated and therefore has low dispersibility, making it unsuitable for the manufacture of black matrices.

[0056] Chemically synthesized carbon black is obtained by processing crude oil or natural gas under high temperature and high pressure conditions. However, it is difficult to produce high-quality carbon black, and the carbon dioxide generated during production has been pointed out as a major problem of environmental pollution.

[0057] The above environmental pollution problems can be solved by using recycled carbon black obtained in the process of recycling waste tires instead of the chemically synthesized carbon black of the comparative example, and the present disclosure is improved by studying a composition for black matrix capable of improving the dispersibility of carbon black.

[0058] In an embodiment, a composition for a black matrix may include a base resin, regenerated carbon black, a dispersant having an amine value and an acid value of about 5 mgKOH / g or more, and a curing agent having three or more functional groups.

[0059] The base resin may comprise an acrylic resin, an epoxy resin, or a combination thereof. The base resin may be used to control the crosslinking density in the composition for the black matrix and to improve the strength, durability, surface hardness, etc. of the coating film when the composition for the black matrix is ​​cured, and may be used to control adhesion to other materials.

[0060] Acrylic resin may refer to a polymer compound derived from a monomer containing an acrylate or methacrylate functional group in its molecular structure. The acrylic resin may contain, for example, at least one of alkyl (meth)acrylate, hydroxyalkyl acrylate, polyethylene glycol alkyl ether methacrylate, perfluoroalkyl (meth)acrylate, or silicone (meth)acrylate. In the present disclosure, "(meth)acrylate" may mean acrylate or methacrylate. The base resin comprising the acrylic resin may contain a hydroxyl group in its molecular structure. The acrylic resin may be a polymer resin having a weight average molecular weight of about 20,000 or more and about 40,000 or less.

[0061] Epoxy resin refers to a synthetic resin produced by a ring-opening reaction of a polymer compound containing two or more epoxy groups in a molecule and its epoxy group. For example, the epoxy resin may be a bisphenol A epoxy resin or a bisphenol F epoxy resin. In an embodiment, the weight average molecular weight of the epoxy resin may be in the range of about 100 to about 100,000. For example, the weight average molecular weight of the epoxy resin may be in the range of about 300 to about 10,000. In the case where the weight average molecular weight of the epoxy resin is less than about 100, the viscosity of the epoxy resin as an ink composition may be low, and in the case where the weight average molecular weight of the epoxy resin exceeds 100,000, the viscosity of the epoxy resin as an ink composition may be too high, thereby making it difficult to spray the epoxy resin.

[0062] Recycled carbon black can be derived from scrap tires. Recycled carbon black can be produced by thermally decomposing scrap tires. Compared to chemically synthesized carbon black produced from crude oil or natural gas (as in comparative examples), recycled carbon black can reduce carbon dioxide emissions by approximately 38.5%. Recycled carbon black can include components derived from scrap tires. In some embodiments, recycled carbon black can contain sulfur, zinc, silica, or a combination thereof.

[0063] Since recycled carbon black is not surface treated, its dispersibility may be deteriorated. By optimizing the dispersant and / or other additives, the dispersibility of recycled carbon black can be improved, and the performance of the black matrix can be improved.

[0064] The average particle size D50 of the regenerated carbon black may be 0.1 μm or more and 5 μm or less. In the case where the average particle size D50 of the regenerated carbon black exceeds 5 μm, the strength of the cured product of the composition for a black matrix may be deteriorated.

[0065] In an embodiment, based on about 100 parts by weight of the base resin, the composition for the black matrix may include about 10 parts by weight or more and about 50 parts by weight or less of the regenerated carbon black. For example, based on about 100 parts by weight of the base resin, the composition for the black matrix may include about 20 parts by weight or more and about 40 parts by weight or about 30 parts by weight or more and about 40 parts by weight or less of the regenerated carbon black. When the regenerated carbon black is less than about 10 parts by weight, the shielding / shading performance may deteriorate, and when the regenerated carbon black exceeds about 50 parts by weight, the dispersibility of the composition may be low.

[0066] The dispersant used with the regenerated carbon black may be a polymer. In embodiments, the weight-average molecular weight of the dispersant may be greater than or equal to about 4,000 and less than or equal to about 25,000. For example, the weight-average molecular weight of the dispersant may be greater than or equal to about 8,000 and less than or equal to about 10,000. If the weight-average molecular weight of the dispersant is less than about 4,000, the fluidity of the composition may increase, making it difficult to control ink jetting. If the weight-average molecular weight of the dispersant exceeds about 25,000, it may be difficult to disperse the composition.

[0067] In an embodiment, based on about 100 parts by weight of the base resin, the composition for the black matrix may include about 1 part by weight or more and about 10 parts by weight or less of the dispersant. For example, based on about 100 parts by weight of the base resin, the composition for the black matrix may include about 2 parts by weight or more and about 6 parts by weight or less or about 4 parts by weight or more and about 5 parts by weight or less of the dispersant. In the case where the dispersant is less than about 1 part by weight, the dispersibility of the composition may be low, and in the case where the dispersant exceeds about 10 parts by weight, the fluidity of the composition may be excessively increased.

[0068] The dispersant may have an amine value and an acid value of approximately 5 mgKOH / g or greater, respectively. When the dispersant has an amine value and an acid value of approximately 5 mgKOH / g or greater, respectively, this means that the dispersant has both selectable alkalinity and acidity. For example, by neutralizing the dispersant's charge by compensating for the difference between alkalinity and acidity, dispersion stability can be improved. In embodiments, the dispersant may have an amine value and an acid value of approximately 10 mgKOH / g or greater and approximately 50 mgKOH / g or less, respectively.

[0069] In an embodiment, the amine value of the dispersant may be greater than or equal to about 10 mgKOH / g and less than or equal to about 50 mgKOH / g. For example, the amine value of the dispersant may be greater than or equal to about 15 mgKOH / g and less than or equal to about 40 mgKOH / g, or may be greater than or equal to about 20 mgKOH / g and less than or equal to about 30 mgKOH / g. If the amine value of the dispersant is less than about 10 mgKOH / g, it is difficult to compensate for the acidity, and thus dispersion stability may be reduced. If the amine value exceeds about 50 mgKOH / g, the viscosity of the composition may excessively increase due to entanglement with the acid.

[0070] In embodiments, the acid value of the dispersant may be greater than or equal to about 10 mgKOH / g and less than or equal to about 30 mgKOH / g. For example, the acid value of the dispersant may be greater than or equal to about 10 mgKOH / g and less than or equal to about 20 mgKOH / g. If the acid value of the dispersant is less than about 10 mgKOH / g, it may be difficult to compensate for alkalinity, and thus dispersion stability may be reduced. If the acid value exceeds about 30 mgKOH / g, the viscosity of the composition may excessively increase due to entanglement with the base.

[0071] In embodiments, the difference between the amine value and the acid value of the dispersant may be greater than or equal to about 0.1 mgKOH / g and less than or equal to about 20 mgKOH / g. For example, the difference may be greater than or equal to about 1 mgKOH / g and less than or equal to about 17 mgKOH / g, or may be greater than or equal to about 5 mgKOH / g and less than or equal to about 15 mgKOH / g. Because the above numerical ranges sufficiently compensate for the difference between basicity and acidity, dispersion stability can be further improved by neutralizing the charge of the dispersant.

[0072] The composition for the black matrix may be a mixture of a first ink including the above-described base resin, regenerated carbon black, and a dispersant, and a second ink including a curing agent described below.

[0073] The curing agent is used to improve coating strength, durability, barrier properties, and the like by cross-linking the base resin contained in the first ink so that the composition can have high density. The curing agent may be a multifunctional agent having three or more functional groups.

[0074] The curing agent may have one or more functional groups selected from the group consisting of isocyanate groups and amine groups. In an embodiment, the curing agent may be a blocked isocyanate oligomer and may include three or more isocyanate groups. In an embodiment, the curing agent may be a biuret or trimer isocyanate compound. In an embodiment, the curing agent may include three or more amine groups.

[0075] The isocyanate curing agent having three or more functional groups may be, for example, polymethylene polyphenylisocyanate, triphenylmethane triisocyanate, toluene diisocyanate trimer, or trimethylolpropane-modified xylenediisocyanate adduct, but is not limited thereto.

[0076] The amine curing agent having three or more functional groups may be, for example, diethylenetriamine or triethylenetetramine.

[0077] In an embodiment, based on the base resin of about 100 parts by weight, the composition for the black matrix may include a curing agent of about 10 parts by weight or more and about 40 parts by weight or less. For example, based on the base resin of about 100 parts by weight, the composition for the black matrix may include a curing agent of about 15 parts by weight or more and about 30 parts by weight or about 20 parts by weight or more and about 25 parts by weight or less. In the case where the curing agent is less than about 10 parts by weight, the crosslinking of the base resin is insufficient, and thus the durability of the cured product may deteriorate. In the case where the curing agent exceeds about 40 parts by weight, the cured product may become susceptible to heat.

[0078] The composition for the black matrix may further include a solvent. The solvent may be included in the first ink and / or the second ink to adjust the concentration or viscosity. Within the spirit and scope of the present disclosure, the solvent may be any material capable of dissolving the base resin, regenerated carbon black, additives, or the like. The solvent may be isophorone, but is not limited thereto.

[0079] The composition for the black matrix may further include a sensitizer, a curing accelerator, a photosensitizer, a filler, an antioxidant, a UV absorber, an anti-aggregating agent, a thermal polymerization inhibitor, a defoamer, a surfactant, a chain transfer agent, a photoinitiator auxiliary agent, a solvent, or a combination thereof. The additive may be included in the first ink. In an embodiment, the composition for the black matrix may further include a defoamer and a filler as additives.

[0080] The defoaming agent destroys bubbles generated in the composition to prevent appearance defects when forming a coating film, and may be a silicon-based material. The barium sulfate filler is an inert material that adjusts the viscosity of the ink composition and prevents cracks when forming a coating film.

[0081] In an embodiment, the first ink may include a base resin, regenerated carbon black, a dispersant, an additive, and a solvent. Relative to a total weight of about 100 parts by weight, the first ink may include about 30 parts by weight or more and about 70 parts by weight or less of the base resin, about 5 parts by weight or more and about 30 parts by weight or less of the regenerated carbon black, about 1 part by weight or more and about 10 parts by weight or less of the dispersant, about 5 parts by weight or more and about 30 parts by weight or less of the additive, and about 10 parts by weight or more and about 50 parts by weight or less of the solvent. In an embodiment, relative to a total weight of about 100 parts by weight, the first ink may include about 40 parts by weight or more and about 60 parts by weight or less of the base resin, about 5 parts by weight or more and about 20 parts by weight or less of the regenerated carbon black, about 1 part by weight or more and about 5 parts by weight or less of the dispersant, about 7 parts by weight or more and about 20 parts by weight or less of the additive, and about 15 parts by weight or more and about 30 parts by weight or less of the solvent.

[0082] The present disclosure provides a method for preparing the above-mentioned composition for a black matrix. Each element of the composition is the same as described above, and therefore the description thereof will be omitted below.

[0083] First, a first ink comprising a base resin, regenerated carbon black, and a dispersant is prepared. After the base resin and solvent are added, a dispersant and a defoamer may be added while the base resin and solvent are stirred by a stirrer, and a filler may also be added. Subsequently, regenerated carbon black may be added to prepare the first ink.

[0084] Subsequently, the first ink may be dispersed. The first ink may be dispersed at room temperature and normal pressure by using a device such as a 3-roll mill.

[0085] A second ink containing the above-mentioned curing agent having three or more functional groups is prepared. In addition to the curing agent, the second ink may further contain a solvent for adjusting the concentration or viscosity.

[0086] Subsequently, the first ink and the second ink may be mixed with each other. For example, a diluent may be added as needed. The composition for the black matrix may be prepared by stirring until bubbles disappear. The second ink may be mixed with the first ink in an amount ranging from about 5 parts by weight to about 20 parts by weight relative to about 100 parts by weight of the first ink.

[0087] The present disclosure provides a composition for the above black matrix or a black matrix including a cured product of the composition, and a display device including the above black matrix.

[0088] The black matrix may include the above composition or a cured product thereof. The composition may be photocurable or thermally curable.

[0089] The black matrix may have excellent ink dispersibility and, even though it may include regenerated carbon black, may have excellent heat resistance and chemical resistance properties.

[0090] Hereinafter, a structure in which a black matrix is ​​applied to a display device will be described in detail. Hereinafter, a display device to which a narrow bezel is applied, which has a frameless or thin bezel from which a top cover partially covering an upper portion of the display device is removed, will be described by way of example, but is not limited thereto.

[0091] Figure 1 is a schematic perspective view showing a display device according to an embodiment, and Figure 2 It is along Figure 1 Schematic cross-sectional view taken along line II'. Figure 1 Also included are directions DR1 , DR2 and DR3 relative to the display device.

[0092] Reference Figure 1 , the display device 1 may include a window 300 and a housing 600 .

[0093] The window 300 may be displayed on the display panel 100 (see Figure 2 ) is visually recognized while protecting the display panel 100 from external impact. In the drawings, a case is shown in which the window 300 has a rectangular shape in which each of its corners is curved on a plane, but the present disclosure is not limited thereto.

[0094] The window 300 may include a display area DA and a non-display area NDA in a planar view. The display area DA is an area where an image displayed from the display panel 100 is visually recognized, and the non-display area NDA is an area where an image is not visually recognized. The non-display area NDA is provided around the display area DA. For example, if the display area DA is formed in a rectangular shape, the non-display area NDA may be provided outside along the edge of the display area DA.

[0095] The pixels may be defined in the display area DA. The pixels may be arranged or disposed in a matrix. Signal lines (eg, gate lines and data lines) for driving each pixel may be disposed at the boundaries of each pixel.

[0096] A portion to which a driving chip or an external driving element such as the printed circuit board 500 is connected may be located in the non-display area NDA.

[0097] The housing 600 may house the elements of the display device 1 including the window 300. The housing 600 may have a plate shape with a bottom and sidewalls. The sidewalls of the housing 600 may be shaped to surround the edge of the window 300 in a plane.

[0098] The display device 1 may further include a black matrix 10 disposed on a lower surface of the window 300. The black matrix 10 may be disposed to overlap with the non-display area NDA of the window 300 in a plane.

[0099] In the following, reference will be made to Figure 1 A cross-sectional structure of the display device 1 including the black matrix 10 will be described in detail with reference to a schematic cross-sectional view of the display device 1 taken along line II′.

[0100] Reference Figure 2 The display device 1 may include a housing 600 , a printed circuit board (PCB) 500 , a flexible printed circuit board (FPCB) F, a passivation layer 400 , a display panel 100 , an adhesive layer 200 , a window 300 , and a black matrix 10 .

[0101] The housing 600 is disposed under the display device 1. As described above, the housing 600 may have a plate shape with a bottom and sidewalls to accommodate elements constituting the display device 1.

[0102] The printed circuit board 500 may be disposed on a bottom portion of the chassis 600. The printed circuit board 500 may transmit a driving signal or the like for the display panel 100 to realize an image to the display panel 100 through a flexible printed circuit board F.

[0103] The passivation layer 400 may be disposed on the printed circuit board 500. The passivation layer 400 is a layer for protecting elements in the display device 1 from external physical impact and chemical influence, and may include a buffer layer, a protective film, or the like within the spirit and scope of the present disclosure.

[0104] The display panel 100 may be disposed on the passivation layer 400. The display panel 100 is an element for realizing an image, and may include a first substrate 110 and a second substrate 120 disposed on the first substrate 110.

[0105] The first substrate 110 may be a substrate in which thin film transistors as switching elements are formed in a matrix. Data lines and gate lines may be connected to source and gate terminals of the thin film transistors, respectively, and pixel electrodes made of a conductive material may be connected to their drain terminals.

[0106] Gate pads and data pads connected to extended ends of the gate and data lines may be provided in an area corresponding to the non-display area NDA on the plane of the first substrate 110. Within the spirit and scope of the present disclosure, the gate pads and data pads may be electrically connected to the printed circuit board 500 through the flexible printed circuit board F to receive driving signals and the like.

[0107] The second substrate 120 may be disposed to face the first substrate 110. A common electrode made of a conductive material may be formed on the second substrate 120 to face the pixel electrodes formed on the first substrate 110. In an embodiment, RGB pixels for realizing colors may be formed on the second substrate 120 in the form of a thin film, but is not limited thereto.

[0108] For example, the display panel 100 may further include a display element disposed between the first substrate 110 and the second substrate 120. The display element may be a liquid crystal display element including a liquid crystal layer or an organic light emitting display element including an organic light emitting layer, but is not limited thereto.

[0109] In an embodiment, the display panel 100 may further include a touch sensing unit or a polarization element attached thereto or embedded therein.

[0110] The adhesive layer 200 may be provided on the display panel 100. The adhesive layer 200 is a layer for fixing the display panel 100 and the window 300 by bonding them to each other, and may include an adhesive resin.

[0111] The adhesive resin may include a photocurable resin. The photocurable resin may be a material in which a photocurable composition made of a monomer, an oligomer, and the like is polymerized into a polymer by irradiation with light of a given wavelength and cured to exert adhesive force.

[0112] In an embodiment, the photocurable composition may be a material that is cured by ultraviolet (UV) irradiation, but is not limited thereto. In an embodiment, within the spirit and scope of the present disclosure, the photocurable composition may be an acrylic compound, a (meth) acrylic compound, or the like. In an embodiment, the photocurable composition may further include a photoinitiator that generates free radicals or ions by light stimulation such as ultraviolet light. Examples of photoinitiators include, but are not limited to, alpha-hydroxyketone, mono- or bisacylphosphine oxide, benzophenone, thioxanthone, ketosulfone, benzyl ketal, phenylglyoxylate, borate, titanosen, and oxime ester photoinitiators.

[0113] In addition to photocurable resins, adhesive resins may also include resins that are cured by stimuli such as temperature, humidity, physical impact, and chemicals, and in the case where the adhesive resin is made of a material that is cured to have adhesive strength, there is no limitation on the type of stimulus that triggers curing.

[0114] The window 300 may be provided on the adhesive layer 200. The window 300 may be provided in a region capable of covering the elements housed by the housing 600 in the display device 1. As described above, the window 300 may protect the display panel 100 from external impact while allowing an image displayed by the display panel 100 to be visually recognized.

[0115] The black matrix 10 may be disposed on the lower surface of the window 300. The black matrix 10 may be disposed so as to overlap with the non-display area NDA of the window 300 in a plane. In an embodiment, the black matrix 10 may be disposed in the same region as the non-display area NDA so as to completely overlap with the non-display area NDA. In an embodiment, the black matrix 10 may define the non-display area NDA.

[0116] As described above, the black matrix 10 may include a composition for a black matrix or a cured product thereof.

[0117] Since at least a portion of the adhesive layer 200 is disposed on the black matrix 10 , the adhesive layer 200 may partially contact the surface of the black matrix 10 .

[0118] Figure 3 is a schematic cross-sectional view showing a display device according to an embodiment.

[0119] Figure 3 The display device 2 is the same as that of the above reference Figure 2 The display devices described are the same except that the display device 2 may further include a background color ink layer 20 disposed between the window 300 and the black matrix 10. Hereinafter, redundant descriptions will be omitted.

[0120] Reference Figure 3 , the background color ink layer 20 may be provided between the window 300 and the black matrix 10. The black matrix 10 may be provided to cover at least one surface or surfaces of the background color ink layer 20. In the drawings, a structure is shown in which the black matrix 10 is provided to cover all lower surfaces and side surfaces of the background color ink layer 20.

[0121] The background color ink layer 20 is a layer used to achieve a desired color for the non-display area (NDA). The color of the non-display area (NDA) of the display device 2 is determined by the color of the ink contained in the background color ink layer 20. For example, the background color ink layer 20 may include inks such as black, blue, red, and white, but is not limited thereto. When the background color ink layer 20 represents a brighter color, for example, the higher the brightness, the thinner the thickness of the black matrix 10 may be. As a result, the black matrix 10 below the background color ink layer 20 may be prevented from being visually recognized, but is not limited thereto.

[0122] If the durability, heat resistance, or chemical resistance of the black matrix 10 deteriorates, the black matrix 10 may be damaged depending on the use of the display device 2, and the background color ink layer 20 may be exposed. For example, the background color ink layer 20 may also be damaged, and visibility may be deteriorated. The black matrix 10 having excellent heat resistance and chemical resistance may be formed so that the background color ink layer 20 can be prevented from being damaged.

[0123] Hereinafter, a preparation example for preparing the black matrix of the present disclosure and an experimental example for evaluating the anti-permeability of the black matrix will be described in detail. However, the scope of the present disclosure is not limited to the following preparation example and experimental example.

[0124] [Preparation and Evaluation of Compositions for Black Matrix]

[0125] <Preparation and Evaluation of First Ink>

[0126] The first ink containing the dispersants shown in Table 1 below was prepared to evaluate particle size D50 and fluidity. The carbon black used in Table 1 below is recycled carbon black prepared by pyrolysis of waste tires and contains zinc (Zn), sulfur (S) and silicon dioxide (SiO2).

[0127] Approximately 45 parts by weight of a base resin and approximately 27 parts by weight of a solvent were placed in an approximately 2000 cc container and stirred. During stirring, approximately 2 parts by weight of a dispersant and approximately 1 part by weight of a defoamer were added. Approximately 10 parts by weight of a filler were slowly added, and stirring was continued for approximately 30 minutes. Subsequently, carbon black was added, and stirring was continued for approximately 30 minutes, thereby preparing a first ink.

[0128] [Evaluation of Particle Diameter] After the first ink was dispersed five times by using a triple roll mill, the particle diameter D50 was measured and listed in Table 1 below.

[0129] [Evaluation of fluidity] For each composition, the viscosity was measured on a Brookfield viscometer so that a thixotropic index (TI) value was calculated as a viscosity index (ie, "fluidity" in Table 1), and is listed in the following Table 1.

[0130] [Table 1]

[0131]

[0132]

[0133] Referring to Table 1, it is noted from Example 1-1 that even in the case of regenerated carbon black, even after dispersion five times, the particle size D50 was about 5 μm or less and low fluidity was present. The polymer dispersant may have an amine value and an acid value of about 5 mgKOH / g or more, thereby achieving excellent dispersibility and fluidity suitable for ink printing.

[0134] In the case where the acid value or amine value of the dispersant is less than about 5 mgKOH / g or the dispersant has a low molecular weight (for example, Comparative Examples 1-1 to 1-5 in Table 1), it can be seen that dispersibility is reduced or fluidity is high, making it unsuitable for ink printing.

[0135] <Preparation and Evaluation of Composition for Black Matrix>

[0136] A first ink was prepared as shown in Table 2 below. A curing agent and a diluent were added to approximately 100 parts by weight of the first ink and stirred for approximately 5 minutes to complete a black matrix composition. When preparing the first ink, the same substance as in Example 1-1 was used as a dispersant, approximately 1 part by weight of a silicone defoamer and approximately 10 parts by weight of a barium sulfate filler were used as additives, and isophorone was used as a solvent. In Table 2 below, HMDI refers to hexamethylene diisocyanate.

[0137] After printing on a tempered glass with the prepared composition for a black matrix, curing was performed at about 150° C. for about 30 minutes to prepare a black matrix having a thickness of about 5 μm.

[0138] [Table 2]

[0139]

[0140]

[0141] [Evaluation of heat resistance] After printing the composition for the black matrix on a glass substrate, curing was performed at about 150°C, and the composition was placed for about 24 hours to prepare a cured product. After immersing the cured product in boiling water for about 2 hours, the cured product was placed at room temperature for about 30 minutes. Afterwards, the tape test of ASTM D3359 was performed, and it was confirmed that the cured product was peeled off from the substrate. 5B is set for the case where there is no peeling at all, 4B is set for the case where the peeling area is less than about 5%, 3B is set for the case where the peeling area is about 5% or more and about 15% or less, 2B is set for the case where the peeling area is greater than about 15% and about 35% or less, 1B is set for the case where the peeling area is greater than about 35% and about 65% or less, and 0B is set for the case where the peeling area is greater than about 65%.

[0142] Chemical Resistance Evaluation: After printing the black matrix composition on a glass substrate, the composition was cured at approximately 150°C and then left to stand for approximately 24 hours. Chemical resistance was then evaluated by measuring the number of times the printed layer was completely rubbed, using an alcohol rubbing machine with one drop of ethanol every two minutes under a load of approximately 1000 g. If the number of rubbings exceeded approximately 300, the composition was considered to have excellent chemical resistance.

[0143] In the case of Example 4-1 to Example 4-4, evaluation of the dispersibility of the first ink and evaluation of the resistance of the black matrix were additionally confirmed.

[0144] [Evaluation of Dispersibility] The first ink was repeatedly dispersed using a triple roll mill, and the number of dispersion times having a particle diameter D50 of about 5 μm or less is listed in Table 3 below.

[0145] [Evaluation of Resistance] The resistance of the prepared black matrix was measured by applying 1000 V to the prepared black matrix with a HIOKI 3454 resistance meter. When the resistance value was 1 GΩ or more, the black matrix was considered to have excellent insulation properties.

[0146] [Table 3]

[0147] Dispersibility Resistance (Ω) Example 4-1 7PASS <![CDATA[1x10 12 ]]> Example 4-2 7PASS <![CDATA[1x10 12 ]]> Example 4-3 7PASS <![CDATA[1x10 12 ]]> Example 4-4 7PASS <![CDATA[1x10 12 ]]>

[0148] Referring to Tables 2 and 3, it can be noted that the black matrix obtained by curing a composition including a polymer dispersant having an amine value and an acid value of about 5 mgKOH / g or more and a curing agent having three or more functional groups has excellent heat resistance and chemical resistance. In Comparative Examples 2-1 and 2-2, in which the curing agent has two functional groups, it can be noted that chemical resistance is significantly deteriorated due to insufficient cross-linking reaction of the base resin.

[0149] It is noted that the dispersibility of the first ink in which a polymer dispersant having an amine value and an acid value of about 5 mgKOH / g is added to the regenerated carbon black is excellent, and the black matrix obtained by curing the composition including the curing agent having three or more functional groups in the first ink has high resistance and therefore also has excellent insulating properties.

[0150] The display device according to one embodiment of the present disclosure can be applied to various electronic devices. The electronic device according to one embodiment of the present disclosure includes the display device described above, and in addition to the display device, may further include a module or device having additional functions.

[0151] Figure 4 is a block diagram of an electronic device according to one embodiment of the present disclosure.

[0152] Reference Figure 4 , the electronic device 1000 according to one embodiment of the present disclosure may include a display module 11 , a processor 12 , a memory 13 , and a power module 14 .

[0153] The processor 12 may include at least one of a central processing unit (CPU), an application processor (AP), a graphic processing unit (GPU), a communication processor (CP), an image signal processor (ISP), and a controller.

[0154] The memory 13 may store data information required for the operation of the processor 12 or the display module 11. When the processor 12 runs an application stored in the memory 13, image data signals and / or input control signals are sent to the display module 11, and the display module 11 is able to process the received signals and output image information through the display screen.

[0155] The power module 14 may include a power supply module such as a power adapter or a battery, and a power conversion module that converts power supplied from the power supply module to generate power required for the operation of the electronic device 1000 .

[0156] At least one of the components of the electronic device 1000 according to one embodiment of the present disclosure may be included in the display device 1 according to an embodiment of the present disclosure. In addition, some of the modules functionally included in one module may be included in the display device 1, and other modules may be provided separately from the display device 1. For example, the display device 1 may include the display module 11, and the processor 12, the memory 13, and the power module 14 may be provided in the form of other devices other than the display device 1 within the electronic device 1000.

[0157] Figure 5 is a schematic diagram of an electronic device according to various embodiments of the present disclosure.

[0158] Reference Figure 5 Various electronic devices to which the display device 1 according to an embodiment of the present disclosure is applied may include not only image display electronic devices (such as smart phones 10_1a, tablet PCs (personal computers) 10_1b, notebook computers 10_1c, TVs 10_1d, and desktop monitors 10_1e), but also wearable electronic devices including display modules (such as smart glasses 10_2a, head-mounted displays 10_2b, and smart watches 10_2c, for example) and vehicle electronic devices 10_3 including display modules (such as a CID (center information display) and interior mirror display, a central instrument panel, and an instrument panel of a car arranged on a dashboard).

[0159] Although the embodiments of the present disclosure have been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that the present disclosure can be implemented in other forms without departing from the technical spirit and essential characteristics of the present disclosure. Therefore, the above embodiments are to be considered in all aspects as illustrative rather than restrictive.

Claims

1. A composition for a black matrix, comprising: base resin; recycled carbon black; a polymer dispersant having an amine value and an acid value, respectively, of 5 mgKOH / g or greater; as well as A curing agent having three or more functional groups.

2. The composition for a black matrix according to claim 1, wherein The amine value and the acid value of the polymer dispersant are respectively 10 mgKOH / g or more and 50 mgKOH / g or less.

3. The composition for a black matrix according to claim 1, wherein The difference between the amine value and the acid value of the polymer dispersant is 0.1 mgKOH / g or more and 20 mgKOH / g or less.

4. The composition for a black matrix according to claim 1, wherein The polymer dispersant has a weight average molecular weight of 4,000 or more and 25,000 or less.

5. The composition for a black matrix according to claim 1, wherein The polymer dispersant may be present in an amount of 1 part by weight or more and 10 parts by weight or less based on 100 parts by weight of the base resin.

6. The composition for a black matrix according to claim 1, wherein The curing agent has at least one functional group of an isocyanate group and an amine group.

7. The composition for a black matrix according to claim 1, wherein The curing agent may be present in an amount of 10 parts by weight or more and 40 parts by weight or less based on 100 parts by weight of the base resin.

8. The composition for a black matrix according to claim 1, wherein The regenerated carbon black includes sulfur, zinc, silica, or a combination of sulfur, zinc, and silica.

9. The composition for a black matrix according to claim 8, wherein The regenerated carbon black is formed from waste tires.

10. The composition for a black matrix according to claim 1, wherein The regenerated carbon black has an average particle size D50 of 0.1 μm or more and 5 μm or less.

11. The composition for a black matrix according to claim 1, wherein The base resin includes acrylic resin, epoxy resin, or a combination of acrylic resin and epoxy resin.

12. The composition for a black matrix according to claim 1, further comprising: sensitizers; Curing accelerator; Photosensitizers; filler; antioxidants; UV absorbers; anti-aggregating agents; Thermal polymerization inhibitors; Defoaming agents; surfactants; Chain transfer agents; Photoinitiator auxiliary; solvents, or a combination of the sensitizer, the curing accelerator, the photosensitizer, the filler, the antioxidant, the ultraviolet absorber, the anti-aggregation agent, the thermal polymerization inhibitor, the defoaming agent, the surfactant, the chain transfer agent, the photoinitiator auxiliary and the solvent.

13. A display device comprising: window; a black matrix, the black matrix being disposed on the window; an adhesive layer disposed on the window, the adhesive layer having at least a portion disposed on the black matrix; as well as a display panel, the display panel being disposed on the adhesive layer, The black matrix uses a base resin, regenerated carbon black, and a polymer dispersant having an amine value and an acid value of 5 mgKOH / g or more, respectively.

14. The display device according to claim 13, wherein: The regenerated carbon black includes sulfur, zinc, silica, or a combination of sulfur, zinc, and silica.

15. The display device according to claim 14, wherein The regenerated carbon black is formed from waste tires.

16. The display device according to claim 13, wherein The polymer dispersant may be present in an amount of 1 part by weight or more and 10 parts by weight or less based on 100 parts by weight of the base resin.

17. The display device according to claim 13, wherein: The black matrix further includes a curing agent having three or more functional groups, and the content of the curing agent is 10 parts by weight or more and 40 parts by weight or less based on 100 parts by weight of the base resin.

18. The display device according to claim 13, wherein The base resin includes acrylic resin, epoxy resin, or a combination of acrylic resin and epoxy resin.

19. A method for preparing a composition comprising: preparing a first ink including a base resin, regenerated carbon black, and a polymer dispersant having an amine value and an acid value, each of the amine value and the acid value being 5 mgKOH / g or greater; dispersing the first ink; preparing a second ink comprising a curing agent having three or more functional groups; as well as The first ink is mixed with the second ink.

20. The method for preparing a composition according to claim 19, wherein Mixing the first ink and the second ink includes using 5 parts by weight or more and 20 parts by weight or less of the second ink relative to 100 parts by weight of the first ink.

21. An electronic device comprising: a display device configured to provide an image; a processor configured to provide an image data signal to the display device; a memory configured to store data information for operation; as well as a power module configured to generate electricity, Wherein, the display device includes: window; a black matrix, the black matrix being disposed on the window; an adhesive layer disposed on the window, the adhesive layer having at least a portion disposed on the black matrix; and a display panel, the display panel being disposed on the adhesive layer, The black matrix uses a base resin, regenerated carbon black, and a polymer dispersant having an amine value and an acid value of 5 mgKOH / g or more, respectively.

Images