Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2000-03-23
2004-08-10
Dudek, James A. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S130000
Reexamination Certificate
active
06774966
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to the field of electronics and may be used for making displays and, in particular, liquid crystal information displays, panels, cells etc.
PRIOR ART
The methods for making liquid crystal displays are known [I. C. Khoo, S. T. Wu, Optics and nonlinear optics of liquid crystals (World Scietific, London) 1993, 390p.-1]. Basically, they consist of depositing on two flat substrates electrical conductive and planar alignment layers and filling the space between the substrates with liquid crystal with positive dielectric anisotropy. Orientation of the liquid crystal is gradually twisted to 90° in the plane of the substrates. Polarization of the light passing such display is similarly twisted and in crossed polaroids it transmits light By applying electric field to the electrodes optical axis of the liquid crystal is reoriented perpendicular to the electrodes and such device does not rotate more the light polarization. Due to this in crossed polaroids such device does not transit light. A set of bright and dark elements makes any picture, half-tone picture as well, because the degree of light transmission gradually depends on the value of the applied voltage.
There are also known liquid crystal devices and methods for making them, as that one described in [S. T. Wu, C. S. Wu, SID Digest 27, 763 (1996)-2]. According to it a chiral liquid crystal with negative dielectric anisotropy is placed between the substrates supplied with electrically conductive electrodes and homeotropically aligning coatings. In crossed polaroids such device does not transmit the light. Under applied electric field optical axis of the liquid crystal tends to orient perpendicular to the electric field in the whole space between the substrates. Given the chirality of the liquid crystal is such that the pitch of its spontaneous twist equals for times the liquid crystal thickness, then under the electric field the liquid crystal spontaneously twists to 90°. In the vicinity of the substrates orientation of the liquid crystal is which is caused either by the anisotropy of the design, or by the residual anisotropy of the homeotropically aligning coating. With polaroids oriented parallel to the liquid crystal optical axis close to the adjacent substrate (and consequently perpendicularly to each other) one can provide such conditions, when polarization of the light follows the liquid crystal orientation. With electric field applied, such device transmits light, the amount of which may be gradually reduced by decreasing the applied voltage.
The drawback of this device, as well as of that one described in [1], is strong dependence of its transmission on the incidence angle of light. As a consequence, at some observation angles strong decrease of the contrast and even its inversion are observed.
According to the technical reference, which is the closest to the proposed one from the point of view of its technical content, to reduce this undesirable phenomenon the known method [1] is modified so, that the area of each pixel consists of domains with various possible orientation of the liquid crystal in the plane of the substrates [M.Schadt, Proc.SID'97, 24.1 (1997).-3]. This is achieved by depositing photocured polymer coating with the subsequent irradiation of different domains of a pixel with ultraviolet light of various polarization (applying multiple photolithography with precise alignment). Liquid crystal alignment at the surface of such coating is determined by the polarization of the polymerizing radiation and therefore is different in different domains of a pixel. In such a case, light transmission of each pixel is the sum of the transmissions of domains with different orientation of the liquid crystal and therefore does not depend on the azimuthal viewing angle. This also eliminates inversion of the intermediate transmission levels. Complexity and high cost (due to multiple photolithography) are the drawbacks of this Technical reference.
Another device is commonly used. [N.Yamagishi, H.Watanabe, K.Yokoyama, ‘Japan Display 89’, 316 (1989)-4], according to which the viewing angle of liquid crystal devices is improved by using special retardation films between the liquid crystal layer and polaroids. Unfortunately, this increases the cost of such devices.
SUMMARY OF THE INVENTION
The object of invention is to simplify the method for making liquid crystal devices by reducing the number of technological operations and consequently to reduce the cost of liquid crystal display without sacrificing the quality (wide viewing angle).
To achieve this, the electric field applied to the liquid crystal in such display has the non-uniform component parallel to the plane of the substrates, which leads to the non-uniform reorientation of the aforementioned liquid crystal in the space between the aforementioned electrodes within the pixel area and hence improves optical properties of this display in various directions of observation.
According to the method electrically conducting and homeotropically aligning layers are deposited on the surfaces of two flat substrates, faced to each other and fill the space between these substrates with the liquid crystal possessing negative dielectric anisotropy. Without electric field the liquid crystal molecules are orthogonal to the substrates and this device does not transmit light in crossed polaroids. Under electric field liquid crystal reorients perpendicular to the electric field not uniformly across the pixel area, but according to the direction of the in-plane component of the electric field. In this way the domains with different (including opposite) orientation of liquid crystal are formed. At various viewing angles different domains have different transmission levels and transmittance of the whole pixel equals to some averaged value. Due to this the phenomenon of inversion of levels with intermediate transmission is reduced for all observation angles, as this takes place in the known device [3].
One can also use non-chiral as well as chiral liquid crystal. In the first case, light transmittance of the liquid crystal between crossed polaroids planarly aligned by the electric field is caused only by birefringence of the liquid crystal. To maximize transmittance under electric field one should align polaroids at 45° to the optical axis of the liquid crystal and the doubled product of the liquid crystal thickness by its birefringence should be equal to the odd number of the light wavelengths. There are four possible variants of such orientation of the liquid crystal and the case, when all four kinds of these domains occupy similar area, meets the requirements of this invention best of all. Due to decrease of the light transmittance with the deviations of the liquid crystal from optimal orientation, the maximal transmittance value can be achieved when under electric field the liquid crystal forms domains with uniform orientation of the liquid crystal within the domain area, the aforementioned orientation having 45° angle with the polaroids direction.
Transmittance of the twisted nematic liquid crystal structure between crossed polaroids depends on the orientation of the liquid crystal axis in their vicinity relative to the polaroids axes. In the case they coincide and the product of the liquid crystal thickness by its birefringence exceeds the light wavelength, polarization of the transmitted light follows the liquid crystal twist. This ensures maximal transmittance of the known device fabricated according to the known method [3] under electric field provided this electric field exceeds the threshold value for the particular liquid crystal. In the proposed device fabricated according to the proposed method the liquid crystal can have various orientation of its optical axis under electric field and to achieve maximal transmittance one should have the product of the liquid crystal thickness by its birefringence equal to the integer number of the light
Konovalov Victor A
Minko Anatoly A
Muravsky Anatoly A
Yakovenko Sergey E
Dudek James A.
LG.Philips LCD Co. , Ltd.
McKenna Long & Aldridge LLP
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