Liquid crystal display device and method for manufacturing same

{
  "publication_number": "US2015268492A1",
  "country": "US",
  "kind": "A1",
  "title": "Liquid crystal display device and method for manufacturing same",
  "abstract": "Provided is a liquid crystal display device which exhibits power saving property and high display quality and is capable of suppressing the time-dependent degradation in display quality. The above problem is solved by providing a liquid crystal display device comprising a liquid crystal cell unit including a color filter having a transparent substrate and a plurality of coloring layers formed on the transparent substrate, a counter substrate and a liquid crystal layer formed between the color filter and the counter substrate and a backlight unit including a light emitting device having a blue light emitting element, and a red fluorescent substance and a green fluorescent substance, and the plurality of coloring layers has a blue coloring layer containing a color material of a specific triarylmethane-based compound and the red fluorescent substance is a surface-treated M 1 2 [M 2 1-x Mn 4+ x F 6] (for example, M 1 represents K + and M 2 represents Si).",
  "claims": [
    "1. A liquid crystal display device comprising: a liquid crystal cell unit including a color filter Paving a transparent substrate and a plurality of coloring layers formed on the transparent substrate, a counter substrate and a liquid crystal layer formed between the color filter and the counter substrate; and a backlight unit including a light emitting device having a blue light emitting element, and a red fluorescent substance and a green fluorescent substance, wherein the plurality of coloring layers has a blue coloring layer containing a color material represented by the following General Formula (I), and the red fluorescent substance is a fluorescent substance that is surface treated and represented by the following General Formula (II): (in General Formula (I), A represents an a-valent organic group of which a carbon atom directly bonded to N does not have a π bond, the organic group represents an aliphatic hydrocarbon group having a saturated aliphatic hydrocarbon group at least at a terminal directly bonded to N or an aromatic group having the aliphatic hydrocarbon group and may contain O, S and N in a carbon chain; B − represents a monovalent anion, and a plurality of B − may be same as or different from one another; R 1 to R 5 each independently represents a hydrogen atom, an alkyl group which may have a substituent or an aryl group which may have a substituent, and R 2 and R 3, and R 4 and R 5 may bond to each other to form a ring structure; Ar 1 represents a divalent aromatic group which may have a substituent; a plurality of R 1 to R 5 and a plurality of Ar 1 may be same as or different from one another, respectively; “a” represents an integer from 2 to 4; “b” represents 0 or 1, and there is no bond when “b” is 0; a plurality of “b” may be same as or different from one another), and M 1 2 [M 2 1-x Mn 4+ x F 6] General Formula (II) (in General Formula (II) above, M 1 represents at least one kind selected from the group consisting of K +, Li +, Na +, Rb +, Cs + and NH 4 +, M 2 represents at least one kind selected from the group consisting of Group 4 elements and Group 14 elements, and “x” is 0<x<0.2). 2. A liquid crystal display device comprising: a liquid crystal cell unit including a color filter having a transparent substrate and a plurality of coloring layers formed on the transparent substrate, a counter substrate and a liquid crystal layer formed between the color filter and the counter substrate; and a backlight unit including a light emitting device having a blue light emitting element, and a red fluorescent substance and a green fluorescent substance, wherein the plurality of coloring layers has a blue coloring layer containing a color material represented by the following General Formula (III), and the red fluorescent substance is a fluorescent substance that is surface treated and represented by the following General Formula (II): (in General Formula (III), A represents an a-valent organic group of which a carbon atom directly bonded to N does not have a π bond, the organic group represents an aliphatic hydrocarbon group having a saturated aliphatic hydrocarbon group at least, at a terminal directly bonded to N or an aromatic group having the aliphatic hydrocarbon group and may contain O, S and N in a carbon chain; B c− represents a c-valent anion; R 1 to R 5 each independently represents a hydrogen atom, an alkyl group which may have a substituent or an aryl group which may have a substituent, and R 2 and R 3, and R 4 and R 5 may bond to each other to form a ring structure; Ar 1 represents a divalent aromatic group which may nave a substituent; a plurality of R 1 to R 5 and a plurality of Ar 1 may be same as or different from one another, respectively; “a” represents an integer from 2 to 4; “c” represents an integer of 2 or more, “b” and represent an integer of 1 or more; “e” represents 0 or 1, and there is no bond when “e” is 0; a plurality of “e” may be same as or different from one another), and M 1 2 [M 2 1-x Mn 4+ x F 6] General Formula (II) (in General Formula (II) above, M 1 represents at least one kind selected from the group consisting of K +, Li +, Na +, Rb +, Cs + and NH 4 +, M 2 represents at least one kind selected from the group consisting of Group 4 elements and Group 14 elements, and x is 0<x<0.2.). 3. The liquid crystal display device according to claim 2, wherein the anion in General Formula (III) is a polyacid anion that contains molybdenum and tungsten and has a molar ratio of molybdenum and tungsten in the range of from 0.4:99.6 to 15:85. 4. The liquid crystal display device according to claim 2, wherein the anion in General Formula (III) is a polyacid anion that contains at least tungsten and has a molar ratio of molybdenum to tungsten of less than 0.4/99.6. 5. The liquid crystal display device according to claim 1, wherein an activator agent concentration of the red fluorescent substance is 6 mol % or less. 6. The liquid crystal display device according to claim 2, wherein an activator agent concentration of the red fluorescent substance is 6 mol % or less. 7. The liquid crystal display device according to claim 1, wherein the light emitting device has a lead frame and is obtained by disposing the red fluorescent substance within 200 μm from a top surface of the lead frame. 8. The liquid crystal display device according to claim 2, wherein the light emitting device has a lead frame and is obtained by disposing the red fluorescent substance within 200 μm from a top surface of the lead frame. 9. A method for manufacturing a liquid crystal display device, which manufactures a liquid crystal display device comprising a liquid crystal cell unit including a color filter having a transparent substrate and a plurality of coloring layers formed on the transparent substrate, a counter substrate and a liquid crystal layer formed between the color filter and the counter substrate, and a backlight unit including a light emitting device having a blue light emitting element, and a red fluorescent substance and a green fluorescent substance, the method comprising steps of: forming the color filter having a blue coloring layer containing a color material represented by the following General Formula (I); and forming the light emitting device wherein the red fluorescent substance is a fluorescent substance that is surface treated and represented by the following General Formula (II): (in General Formula (I), A represents an a-valent organic group of which a carbon atom directly bonded to N does not have a π bond, the organic group represents an aliphatic hydrocarbon group having a saturated aliphatic hydrocarbon group at least at a terminal directly bonded to N or an aromatic group having the aliphatic hydrocarbon group and may contain O, S and N in a carbon chain; B − represents a monovalent anion, and a plurality of B − may be same as or different from one another; R 1 to R 5 each independently represents a hydrogen atom, an alkyl group which may have a substituent or an aryl group which may have a substituent, and R 2 and R 3, and R 4 and R 5 may bond to each other to form a ring structure; Ar 1 represents a divalent aromatic group which may have a substituent; a plurality of R 1 to R 5 and a plurality of Ar 1 may be same as or different from one another, respectively; “a” represents an integer from 2 to 4; “b” represents 0 or 1, and there is no bond when “b” is 0; a plurality of “b” may be same as or different from one another), and M 1 2 [M 2 1-x Mn 4+ x F 6] General Formula (II) (in General Formula (II) above, M 1 represents at least one kind selected from the group consisting of K +, Li +, Na +, Rb +, Cs + and NH 4 +, M 2 represents at least one kind selected from the group consisting of the Group 4 elements and the Group 14 elements, and “x” is 0<x<0.2.) 10. A method for manufacturing a liquid crystal display device, which manufactures a liquid crystal display device comprising a liquid crystal cell unit including a color filter having a transparent substrate and a plurality of coloring layers formed on the transparent substrate, a counter substrate and a liquid crystal layer formed between the color filter and the counter substrate, and a backlight unit including a light emitting device having a blue light emitting element, and a red fluorescent substance and a green fluorescent substance, the method comprising steps of: forming the color filter having a blue coloring layer containing a color material represented by the following General Formula (III); and forming the light emitting device wherein the red fluorescent substance is a fluorescent substance that is surface treated and represented by the following General Formula (II): (in General Formula (III), A represents an a-valent organic group of which a carbon atom directly bonded to N does not have a π bond, the organic group represents an aliphatic hydrocarbon group having a saturated aliphatic hydrocarbon group at least at a terminal directly bonded to N or an aromatic group having the aliphatic hydrocarbon group and may contain O, S and N in a carbon chain; B c− represents a c-valent anion; R 1 to R 5 each independently represents a hydrogen atom, an alkyl group which may have a substituent or an aryl group which may have a substituent, and R 2 and R 3, and R 4 and R 5 may bond to each other to form a ring structure; Ar 1 represents a divalent aromatic group which may nave a substituent; a plurality of R 1 to R 5 and a plurality of Ar 1 may be same as or different from one another, respectively; “a” represents an integer from 2 to 4; “c” represents an integer of 2 or more, “b” and “d” represent an integer of 1 or more; “e” represents 0 or 1, and there is no bond when “e” is 0; a plurality of “e” may be same as or different from one another), and M 1 [M 2 1-x Mn 4+ x F 6] General Formula (II) (in General Formula (II) above, M 1 represents at least one kind selected from the group consisting of K +, Li +, Na +, Rb +, Cs + and NH 4 +, M 2 represents at least one kind selected from the group consisting of Group 4 elements and Group 14 elements, and “x” is 0<x<0.2)."
  ],
  "description_excerpt": "The present invention relates to a liquid crystal display device which exhibits favorable power saving properties and display quality and a method for manufacturing the same.\n\nIn recent years, the demand for a liquid crystal display device has increased in association with the development of a personal computer, especially a portable personal computer. In addition., the market of liquid crystal display device has recently expanded more and more as the ownership rate of the household liquid crystal television has also increased and a smartphone and a tablet terminal have been widely spread.\n\nSuch a liquid crystal display device generally includes a liquid crystal cell unit equipped with a color filter, a counter substrate and a liquid crystal layer sandwiched therebetween and further a light source called backlight.\n\nIn recent years, a liquid crystal display device is strongly required to have a power saving function. In addition, a liquid crystal display device is required to have higher display quality, specifically, high contrast and high color reproducibility.\n\nTo cope with the requests for a liquid crystal display device describe above, for example, it has been investigated to use a white LED light source instead of a light source using a cold-cathode tube of the related art in the backlight, and the proposal has been partially put to practical use. The white LED light source has advantages such as a long life, high efficiency and power saving.",
  "cpc": [
    "G02F 1/1336",
    "C09K 11/025",
    "C09K 11/617",
    "G02F 1/133514",
    "G02F 1/133516",
    "G02F 1/133614",
    "G02F 1/133617",
    "G02F 2001/133614"
  ],
  "ipc": [
    "G02F 1/1335"
  ],
  "assignees": [
    "Nichia Corp",
    "Dai Nippon Printing Co Ltd"
  ],
  "inventors": [
    "Kazuyuki Hino",
    "Seiji Tawaraya",
    "Atsushi Yamamoto",
    "Tomokazu Yoshida",
    "Saiki Yamamoto"
  ],
  "filing_date": "2015-03-17",
  "publication_date": "2015-09-24",
  "priority_date": "2014-03-19",
  "application_number": "US-201514659897-A",
  "family_id": "54141961",
  "cited_by_count": 7,
  "citations": [
    "US20100271578A1",
    "JP2011059673A",
    "US20130018198A1"
  ]
}