• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method of forming a color liquid crystal display device, in which a cholesteric liquid crystal mixed with a vertical alignment agent and a polymer is injected into a cell gap of an upper liquid crystal substrate and a lower liquid crystal substrate to which an absorption plate is attached, A color liquid crystal display device is formed to reduce viewing angle dependence and wavelength dependency, thereby enabling a wide viewing angle.
    公开号:KR19990043889A
    申请号:KR1019970064936
    申请日:1997-11-29
    公开日:1999-06-15
    发明作者:전병건
    申请人:김영남；오리온전기 주식회사；
    IPC主号:
    专利说明:

    Method for forming color liquid crystal display device
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a color liquid crystal display (LCD), and more particularly, to a technique of forming a cholesteric LCD by mixing a polymer with vertically aligned liquid crystal.
    LCD, which is a type of flat panel display, is a device that changes the optical anisotropy by applying an electric field to the liquid crystal, which has fluidity of liquid and optical properties of crystals. It consumes more power than conventional cathode ray tube Low in volume, small in size, and capable of high-definition colorization and high definition, and is widely used.
    Generally, the LCD is configured such that a liquid crystal is sealed between upper and lower substrates on which transparent electrode patterns are formed. In addition to the reflection type LCD using reflection light, the LCD may include an electro luminescence panel, (Light Emitting Diode) panel or a cold cathode tube (Cold Cathode Fluorescence) panel.
    1A to 1C are cross-sectional views illustrating a conventional method of forming a color LCD.
    First, a lower substrate 31 made of a transparent material such as quartz, glass, or plastic is etched to form a groove. A groove is formed by etching a portion where the color filter is to be formed, .
    At this time, the lower substrate 31 is formed of quartz, glass, or plastic. The grooves are formed to have a width of 100 to 300 탆, and a distance between the grooves and the grooves, that is, a portion where the black mattress is to be formed, is formed with a width of 8 to 12 탆.
    Then, a black mattress is formed on the lower substrate 31 which is not etched. At this time, the black mattress is formed by using a black pigment or a chromium-based metal that can prevent the degradation of color purity.
    A lower transparent electrode is formed on the bottom of the groove to a predetermined thickness.
    At this time, the lower transparent electrode 17 is formed of a material such as indium thin oxide (ITO) or tin oxide (SnO 2 ).
    Then, a protective film for the transparent electrode (not shown) is formed on the entire surface, a lower orientation film is formed on the protective film for the transparent electrode, and a rubbing roll in which a cylindrical core is wound to give directionality to the orientation film To perform rubbing.
    Then, an upper transparent electrode, a protective film, and an upper alignment film are sequentially formed on the upper liquid crystal substrate 35.
    At this time, the upper substrate 35 is formed of quartz, glass or plastic. The upper transparent electrode is formed of ITO or SnO 2 material.
    Thereafter, the upper and lower substrates 35 and 31 are bonded and a seal pattern for liquid crystal sealing is formed, the upper and lower substrates 35 and 31 are bonded together, and then the cell gap formed by the grooves is cholesteric The liquid crystal 37 is injected and sealed.
    At this time, the cholesteric liquid crystal 37 contains a polymer which functions as a liquid crystal and absorbs impact, and is formed in a spiral shape in accordance with the kind of impurities injected into the liquid crystal. The first cholesteric liquid crystal reflects the polarized light and the left cholesteric liquid crystal transmits the polarized light so that the absorption plate formed in the subsequent process absorbs the polarized light.
    Here, the polarized light has Bragg reflections such as n d = m · λ (n: refractive index of liquid crystal, d: cell gap, m: constant, λ: wavelength of light reflected by cholesteric liquid crystal) Cause.
    The pitch of the cholesteric liquid crystal 37 increases or decreases according to the amount of the impurities, and the color of the color can be improved by changing the size of the lambda in the range of about 560 to 650 nm.
    Then, an absorption plate 33 is attached to the lower substrate 31 to complete a color LCD module.
    At this time, the absorption plate 33 absorbs the light transmitted through the cholesteric liquid crystal 37, thereby improving the sharpness of the color of the portion reflected by the cholesteric liquid crystal 37.
    The absorption plate 33 is formed of a material containing chromium or a black pigment.
    Then, a polarizer (not shown) is formed on the lower substrate 31.
    Here, the wavelength Of the reflected light is equal to the product of the pitch p and the refractive index n.
    FIG. 1A shows a state in which power is applied, and FIG. 1B shows a state in which a power source is applied.
    1C shows a phenomenon in which a liquid crystal is cured by using UV light, incident light is irradiated, and then partially selectively reflected.
    At this time, the polymer is cured by the UV light, and the cured polymer 39 divides the liquid crystal.
    As described above, the color liquid crystal display device according to the related art has a problem in that a color change is serious because light in a short wavelength range corresponding to [lambda] = np is reflected, and thus the dependence on the viewing angle is large.
    SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of forming a color liquid crystal display device capable of solving a viewing angle dependency and a specific wavelength dependence to enable wide viewing angle of a device.
    1A to 1C are cross-sectional views illustrating a conventional color liquid crystal display device.
    2A to 2D are cross-sectional views illustrating a color liquid crystal display device according to the present invention.
    Description of the Related Art
    11, 31: Lower liquid crystal substrate 13, 33:
    15, 35: upper liquid crystal substrate 17, 37: (cholesteric liquid crystal)
    19,21,23,39: Polymer 25: Direction of light
    According to another aspect of the present invention, there is provided a method of forming a color liquid crystal display device,
    Injecting and sealing a cholesteric liquid crystal mixed with a vertical alignment agent and a polymer in a cell gap of an upper liquid crystal substrate and a lower liquid crystal substrate to which an absorption plate is attached,
    And a step of UV-curing the liquid crystal,
    And the UV curing process is performed by applying a voltage smaller than a vertical alignment threshold voltage to the liquid crystal.
    Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
    First, a lower substrate 11 made of a transparent material such as quartz, glass, or plastic is etched to form a groove. A portion where the color filter is to be formed is etched to form a groove, .
    At this time, the lower substrate 11 is formed of quartz, glass or plastic. The grooves are formed to have a width of 100 to 300 탆, and a distance between the grooves and the grooves, that is, a portion where the black mattress is to be formed, is formed with a width of 8 to 12 탆.
    Then, a black mattress is formed on the lower substrate 31 which is not etched. At this time, the black mattress is formed by using a black pigment or a chromium-based metal that can prevent the degradation of color purity.
    A lower transparent electrode is formed on the bottom of the groove to a predetermined thickness.
    At this time, the lower transparent electrode is formed of a material such as indium thin oxide (ITO) or tin oxide (SnO 2 ).
    Then, a protective film for the transparent electrode (not shown) is formed on the entire surface, a lower orientation film is formed on the protective film for the transparent electrode, and a rubbing roll in which a cylindrical core is wound to give directionality to the orientation film To perform rubbing.
    Then, an upper transparent electrode, a protective film, and an upper alignment film are sequentially formed on the upper liquid crystal substrate 15.
    At this time, the upper substrate 15 is formed of quartz, glass or plastic. The upper transparent electrode is formed of ITO or SnO 2 material. The alignment layer is vertically aligned using a vertical alignment agent having a small fixed energy.
    Thereafter, the upper and lower substrates 15 and 11 are bonded and a seal pattern for liquid crystal sealing is formed, and the upper and lower substrates 15 and 11 are bonded to each other. Then, The liquid crystal 17 is injected and sealed.
    At this time, the cholesteric liquid crystal 17 contains a polymer which maintains the liquid crystal shape and absorbs the impact, and is formed in a spiral shape in accordance with the type of impurities injected into the liquid crystal. The first cholesteric liquid crystal reflects the polarized light and the left cholesteric liquid crystal transmits the polarized light so that the absorption plate formed in the subsequent process absorbs the polarized light.
    Here, the polarized light has Bragg reflections such as n d = m · λ (n: refractive index of liquid crystal, d: cell gap, m: constant, λ: wavelength of light reflected by cholesteric liquid crystal) Cause.
    The pitch of the cholesteric liquid crystal 17 increases or decreases according to the amount of the impurities, and the color of the color can be improved by changing the size of the lambda in the range of about 560 to 650 nm.
    Then, an absorption plate 13 is attached to the lower substrate 11 to complete a color LCD module.
    At this time, the absorption plate 13 absorbs the light transmitted through the cholesteric liquid crystal 17, thereby improving the sharpness of the color of the portion reflected by the cholesteric liquid crystal 17.
    The absorption plate 13 may be formed of a material containing chromium or a black pigment.
    Then, a polarizing plate (not shown) is formed on the lower substrate 11.
    Then, power is applied to the liquid crystal substrate at a voltage lower than the vertical alignment threshold voltage, and UV is irradiated from above to cure the polymer to form the state of FIG. 2A.
    Then, the power is turned off to form the state shown in FIG. 2B and the state is maintained. At this time, FIG. 2B selectively reflects incident light. Then, the reflected light becomes white.
    Then, power is applied to the liquid crystal substrate again, and a vertical alignment threshold voltage is applied so that a vertical alignment effect can be generated.
    As a result, it is used as a cholesteric LCD by going through the state of FIG. 2C and the state of FIG. 2D.
    Here, in the state of FIG. 2C, all of the liquid crystal is vertically aligned irrespective of the polymer, and light is absorbed into the absorption plate 13 to realize black.
    2D, the liquid crystal returns to the cured state of FIG. 2B and reflects the incident light. Since the power source is applied, the color is changed by causing the color change regardless of the cured polymer. At this time, the LCD can realize various color changes and can be wide viewing angle.
    INDUSTRIAL APPLICABILITY As described above, the method of forming a color liquid crystal display according to the present invention has the effect of enabling a wide viewing angle by reducing viewing angle dependence and wavelength dependency as in the prior art.
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] Injecting and sealing a cholesteric liquid crystal mixed with a vertical alignment agent and a polymer in a cell gap of an upper liquid crystal substrate and a lower liquid crystal substrate to which an absorption plate is attached,
    And UV-curing the liquid crystal.
    [2" claim-type="Currently amended] The method according to claim 1,
    Wherein the UV curing process is performed by applying a voltage lower than a vertical alignment threshold voltage to the liquid crystal.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-11-29|Application filed by 김영남, 오리온전기 주식회사
    1997-11-29|Priority to KR1019970064936A
    1999-06-15|Publication of KR19990043889A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019970064936A|KR19990043889A|1997-11-29|1997-11-29|Method for forming color liquid crystal display device|
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