Liquid crystal display device
|発明の名称 （英語）||Liquid crystal display device|
[PROBLEMS] To provide a liquid crystal display device that does not need any surface aligning treatment, realizes striking increase of a response speed of movie display and is free from any light leakage (produce dark field) at black display. [MEANS FOR SOLVING PROBLEMS] There is provided a liquid crystal display device comprising a pair of transparent substrates and, interposed therebetween, a polymer stabilized blue-phase liquid crystal. The liquid crystal display device utilizing the polymer stabilized blue-phase liquid crystal exhibits a large birefringence change upon application of an electric field to cell substrate in an in-plane direction. The polymer stabilized blue-phase liquid crystal is composed of a low-molecular liquid crystal capable of developing a blue phase between cholesteric phase and isotropic phase and a polymer network created in the low-molecular liquid crystal. Further, by optimizing the type and amount of chiral dopant added to the liquid crystal, there can be provided a liquid crystal display device that is free from any light leakage (produce dark field) at black display.
(C) KIPO WIPO 2007
Liquid crystal display devices can be widely used in the field optical information processing device and the semiconductor device. A conventional liquid crystal display modes includes, TN, STN, IPS, VA (MVA), or the like can be OCB, either of which is controlled in advance orientation of liquid crystal molecules by an electric field is applied to turning the other orientation and a change in state, the polarization directions of the light penetrating but which changes the polarization state, such as a polarizing plate this change in the contrast of the luminance value of converting and displaying is typically used.
Such a conventional liquid crystal display scheme, either of which is for controlling the orientation of liquid crystal molecules require a surface orientation treatment. Particularly VA except (MVA) based scheme may require a rubbing treatment. Rubbing is, applied to a substrate surface that contacts the liquid crystal alignment film surface by rubbing cloths and the like and an operation, lowering of the yield and a cost gona cause of deterioration of display quality and others. In addition, the Fig. nematic any of the approaches of using liquid crystal since the response time is short and it is approximately 10 msec, television in a moving display was limitations in the near future.
In recent years, for a liquid crystal display (chiral nematic) liquid crystal as the chiral nematic liquid crystal have been developed (patent document 1, 2 etc.) but, the present inventors have, in order to solve the problems noted, in place of a conventional nematic liquid crystal, polymer stabilized blue phase liquid crystal (patent document 3) developed. This polymer stabilization blue phase liquid crystal, a blue phase is having a fast responsivity temperature range without losing its expression by the polymer to significantly improve the novel material. Polymer stabilization the blue phase is, in an electric field due to the unmanned virtual state is optically isotropic, does not need to control the orientation. A zero value to zero electric field birefringence, birefringence is induced electric field in accreditation (induction) using a phenomenon that the display of a novel manner. Its response time is the primary Si is 100μ since may be markedly than the conventional liquid crystal display element response is fast.
On the other hand, the liquid crystal screen have become large in order to cope with a higher quality, switching the same surface (IPS) is under development (non Patent document 1, patent document 4 and the like). In such a system, the equilibrium surface of the substrate to place to the electric field manner but, in this way a liquid crystal material is applied and it was requested.
Patent document 1: Japanese Unexamined Patent Publication 2003-295225
Patent document 2: Japanese Unexamined Patent Publication 2001-316346
Patent document 3: Japanese Unexamined Patent Publication 2003-327966
Patent document 4: Japanese Unexamined patent 9-269497
Non Patent literature 1:Appl. Phys. Lett. 67 (26), 395-3897 (1995)
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5. Cholesteric phase between the isotropic phase of a blue phase liquid crystal and may be low,
Wherein the low molecular weight polymer network liquid crystal formed in the liquid crystalline monomer and non polymerized with crosslinking of the polymer formed by the network system in the blue phase liquid crystal composition is composed of a polymer stabilized blue phase liquid crystal configuration wherein,
Wherein the polymer stabilized blue phase liquid crystal and chiral dopant,
Wherein the polymer stabilized blue phase liquid crystal is a chiral dopant for the amount of the polymer stabilized blue phase liquid crystal in the visible region of the (380-750nm) appeared in addition to being adapted to be a polymer stabilized blue phase liquid crystal.
6. 5 the first method and the polymer stabilized blue phase liquid crystal, a pair of transparent substrate is interposed in the liquid crystal display element,
Applying an electrical field parallel to the substrate of the liquid crystal display element.
7. Method according to claim 6,
The electric field, each one of a heater incorporated with a transparent funny (comb) type 2 is applied by two electrodes of the liquid crystal display element.
8. 6 the first or second apparatus according to any one of the method according to claim 7,
The electric field in the substrate plane and one of the common electrode and TFT incorporated with, one of the TFT-off to claim, according to the input signal to the electrode and the common electrode with an electric field applied between the TFT to a liquid crystal display device.
|参考情報 （研究プロジェクト等）||SORST Selected in Fiscal 2003|
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