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Liquid crystal display including O-type and E-type polarizer

a technology of liquid crystal display and polarizer, which is applied in the field of information displays, can solve the problems of limited viewing angle, polarizers with substantial drawbacks, and high transmission of light incident at an angle (0.45) to the surface of polarizers, and achieves the improvement of angle characteristics of polarizers, limited applicability, and insufficient polarizing effectiveness

Inactive Publication Date: 2006-06-01
YEH POCHI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a method to improve the performance of polarizers and LC displays by using a combination of E- and O-type polarizers. The O-type polarizer provides high light transmission while the E-type polarizer provides high angle characteristics in the closed state. The E-type polarizer is made by forming a thin film of molecular-oriented LCP on the surface of O-type polarizer. The use of a combination of different types of polarizers can be used in various fields of technology, such as liquid crystal displays. The technical effects of this patent include improved angle characteristics, reduced unpolarized light transmission, enhanced polarizing effectiveness, improved contract, widening of viewing angle, and elimination of the "gray field" effect during operation.

Problems solved by technology

The main drawback of the described above displays is the limited viewing angle.
Despite the high polarizing effectiveness, these polarizers have substantial drawbacks.
One of the main drawbacks featured by the two cross-oriented polarizers is the high transmission of light incident at an angle (±0.45) to the surface of the polarizers.
Such polarizer features a number of substantial disadvantages, which limit its applicability.
One of those is the insufficient polarizing effectiveness, and some transmission of light has been registered trough two parallel cross-oriented polarizers of this type with the incident unpolarized light at an angle to their surfaces.

Method used

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  • Liquid crystal display including O-type and E-type polarizer
  • Liquid crystal display including O-type and E-type polarizer
  • Liquid crystal display including O-type and E-type polarizer

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0025] In a first embodiment, as seen in FIG. 1, there is a liquid crystal display containing at least one layer of the liquid crystal placed between two plates. On each plate there is disposed or applied at least one electrode, a system of electrodes, or an active matrix; and at least one layer of polarizer. At least one layer of polarizer is an O-type polarizer and at least one layer of polarizer is an E-type polarizer.

[0026] In a display of the first embodiment, the O-type polarizer is preferably an iodine-polyvinyl, iodine-polyvinylene or polyvinylene polarizer. The E-type polarizer is preferably formed as a thin film comprised of a plurality of supramolecular complexes of one or several organic materials, the supramolecular complexes being generally unidirectionally oriented in order to ensure polarization of incident light.

[0027] A dichroic polarizer is preferably used as the E-type polarizer, the dichroic polarizer comprising a film of oriented molecules of an organic compou...

second embodiment

[0036] In a second embodiment as seen in FIG. 2, the display contains at least one layer of liquid crystal placed between two plates. On each plate, there has been disposed or formed at least one electrode or a system of electrodes, or an active matrix, wherein on one of the plates there has been disposed a diffuse- or mirror-reflecting layer, and on one of the plates there has been disposed at least one layer of an O-type polarizer and at least one layer of an E-type polarizer.

[0037] In this second embodiment the layers of polarizers of O- and E-type are applied to different sides of a plate. In this instance, the O-type polarizer is formed using iodine-polyvinyl, iodine-polyvinylene or polyvinylene polarizer, and the E-type polarizer comprises a thin film comprised of a plurality of supramolecular complexes of one or several organic compounds, wherein the supramolecular complexes are unidirectionally oriented in order to polarize the incident light.

[0038] A dichroic polarizer is ...

third embodiment

[0043] In a third embodiment as seen in FIG. 3, there is a polarizer, comprising at least two layers, at least one of which is an O-type polarizer and at least one of the polarizer layers is an E-type polarizer. In this embodiment, the O-type polarizer is preferably an iodine-polyvinyl, iodine-polyvinylene or polyvinylene polarizer, and the E-type polarizer used is a thin film comprised of a plurality of supramolecular complexes of one or several organic compounds, wherein the supramolecular complexes are unidirectionally oriented in a determined direction in order to polarize the incident light.

[0044] The E-type polarizer is a dichroic polarizer. This dichroic polarizer comprises a film of oriented molecules of an organic compound, wherein the main axes of the ellipsoids of the real and imaginary part of an anisotropic refraction coefficient of the compound forming the film is in the range of at least one band of absorption wavelengths. The following is true for an area with the li...

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Abstract

The disclosure pertains to the devices of information displays, in particular liquid crystal displays, and could be utilized in indication devices for various purposes. Liquid crystal displays, according to this disclosure, contain at least one layer of liquid crystal placed between two plates, on each plates there has been formed or applied at least one electrode or a system of electrodes, or an active matrix, and at least one layer of polarizer; while at least one polarizing layer is the E-type polarizer and at least one polarizing layer is an O-type polarizer. The polarizer, according to the invention, consists of at least two polarizers, at least one of which is the E-type polarizer and at least one is the O-type polarizer.

Description

RELATED APPLICATIONS [0001] This is a divisional application of U.S. application Ser. No. 10 / 240,531, which entered the United States national stage on Apr. 14, 2003 under 35 U.S.C. § 371 for PCT / US01 / 13189 filed Apr. 24, 2001, which claims priority to RU200110172 filed Apr. 24, 2000, the disclosures of all of which are incorporated herein by reference.BACKGROUND [0002] 1. Field [0003] The disclosure pertains to the technology of information displays, in particular to the liquid crystal displays (LCD), and could be utilized in devices of various configurations. [0004] 2. Description of the Related Art [0005] The following references, which are incorporated by reference are of interest in this disclosure. [0006] 1. L. K. Vistrin. GVHO, 1983, vol. XXVII, 2nd ed., pp. 141-148 [0007] 2. U.S. Pat. No. 5,007,942, 1991 [0008] 3. RU 2120651, 1998 [0009] 4. U.S. Pat. No. 5,739,296, 1998 [0010] These references are now further discussed. [0011] There are liquid crystal (LC) displays, which ar...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02F1/1335G02B5/30G02F1/13363
CPCG02B5/3016G02F1/133528G02F1/13363G02F2001/133565G02F1/133565
Inventor YEH, POCHISAKHAROVA, ALLA Y.BOBROV, YURI A.
Owner YEH POCHI