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Improved transmission or reflection type LCD and mfg method

A liquid crystal display, liquid crystal technology, applied in the direction of instruments, other household appliances, thin material processing, etc., to achieve the effect of easy specification diversification, easy operation, and excellent contrast ratio

Inactive Publication Date: 2004-06-09
SIPIX IMAGING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods do not allow precise encapsulation of high concentrations of guest dyes in the liquid crystal phase during fabrication, thus only low concentrations of dyes can be encapsulated in monodisperse polymer particles.

Method used

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  • Improved transmission or reflection type LCD and mfg method
  • Improved transmission or reflection type LCD and mfg method
  • Improved transmission or reflection type LCD and mfg method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0046] I. Preparation of Microcups

[0047] Microcup arrays can be fabricated by micromolding, photolithography, or pre-perforation methods, as in WO 02 / 56097 and U.S. Application No. 09 / 942,532 filed August 29, 2002 (U.S. Publication No. 2002-75556, published in 2002 June 20), both of which are hereby incorporated by reference.

[0048] Suitable compositions for making these microcups are also disclosed in these references. Examples of compositions for micromolding or photolithography (disclosed in WO 02 / 56097) include thermoplastics, thermosets or precursors thereof such as multifunctional acrylates or methacrylates, vinyl esters, epoxides and their oligomers, polymers or the like. In one particular embodiment, multifunctional acrylates and their oligomers can be used. The combination of multifunctional epoxides and multifunctional acrylates is also beneficial to obtain desirable physical and mechanical properties. Typically, a flexibility-imparting cross-linkable oligom...

Embodiment 1

[0100] Embodiment 1 makes microcup by micromolding

[0101] The compositions shown in Table 1 were coated onto 2 mil PET film pre-coated with an ITO conductive layer (ITO / PET film, 5 mil OC50, from CPFilms, Martinsville, VA) using a No. 6 Myrad rod. . A pre-imaged (4 μm width x 4 μm length x 4 μm height x 4 μm separation) cobalt-nickel punch and release agent Frekote 700-NC from the Henkel company were used for micromolding. Coating thickness is controlled at about 5 microns. The coated film was then embossed with the punch using a press roll at 90°C. The coating was then cured by UV light through a Mylar film for about 1 minute using a Cure Zone exposure device (ADAC Technologies) equipped with a metal fluoride lamp with an intensity of 80 mW at 365 nm / cm 2 . The embossed film was then demolded to reveal microcups (4 μm width x 4 μm length x 4 μm depth x 4 μm separation). The micromolding was performed at 90°C using a GBC laminator.

[0102] Numbering

Embodiment 2

[0103] Embodiment 2 makes microcup by micromolding

[0104] Coating was carried out using the same procedure as in Example 1, using the formulation in Table 2, and molding was carried out with the same 4x4x4x4 μm punch.

[0105] Numbering

[0106] A No. 12 Myrad rod was used. The target coating thickness is about 5 microns. The micro embossing was done using a press roll (GBC laminator) heated to 90°C.

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Abstract

This invention relates to a liquid crystal display with improved contrast ratio, switching performance, reflectivity at the Dmin state and structural integrity, and methods for its manufacture.

Description

technical field [0001] The present invention relates to liquid crystal displays having improved contrast, switching performance, reflectivity in the minimum density state, and structural integrity, and methods of making the same. Background technique [0002] A polymer dispersed liquid crystal (PDLC) display generally comprises two transparent plates with electrodes placed opposite each other and separated by a spacer. A polymer dispersed liquid crystal film is encapsulated between two electrode plates. The thickness of the polymer dispersed liquid crystal film can be up to 200 microns, but its thickness is usually between 2 microns and 50 microns. The cell is sealed to remove oxygen and moisture which are chemically corrosive to the liquid crystal. A thorough review of polymer dispersed liquid crystal technology can be found in "Liquid Crystal Dispersions" (1995) by P.S. Drzaic. Polymer dispersed liquid crystals generally consist of micron-sized droplets of low molecular...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1333G02F1/1334G02F1/1347G02F1/167
CPCG02F1/13475G02F1/1334G02F1/133377Y10T428/1059G02F1/167Y10T428/1005B29D11/0073C09K2323/02C09K2323/05
Inventor 梁荣昌曾金仁李英熙
Owner SIPIX IMAGING INC
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