Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Transflective liquid crystal display with patterned optical layer

一种液晶显示器、光学层的技术，应用在制造这种显示器,图案化光学层领域，能够解决不是、降低对比度和图像锐度、模糊等问题，达到易于制造、避免视差问题、优化光学性质的效果

Inactive Publication Date: 2009-06-17
KONINK PHILIPS ELECTRONICS NV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this results in reduced contrast and image sharpness (blurring) and is not preferred

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Transflective liquid crystal display with patterned optical layer
  • Transflective liquid crystal display with patterned optical layer
  • Transflective liquid crystal display with patterned optical layer

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0092] The substrate is provided with an alignment layer (rubbed polyimide or photo-alignment layer). A mixture of active LC materials including some (active) isomerizable chiral compounds is spin-coated on top of the alignment layer, which provides a layer of cholesteric ordered material with a cholesteric pitch less than or equal to 300 nm. The mixture may further include a reactive achiral LC, a non-isomerizable chiral compound and a photoinitiator. The layer can be irradiated in a desired pattern so that in the irradiated regions (where the layer has become nematic) the isomerizable chiral compound is switched and the cholesteric pitch is increased to infinity. This can be achieved if the helical twisting power (HTP) of the isomerizable chiral compound is zero at the time of the switch, or if the product of the HTP times the concentration of the isomerizable chiral compound is divided by the HTP and the HTP present in the mixture after the switch The products of the conce...

example 2

[0095] In this second approach, active chiral LC compounds or mixtures of (chiral) active LC materials are used which exhibit a chiral nematic (cholesteric) phase as well as a smectic A phase. The material or mixture is spin-coated on a substrate provided with an alignment layer. At low temperatures, the material is in the smectic A phase and in this way forms a uniaxial retardation layer after spin coating. Irradiating the layer according to the desired pattern will produce photopolymerization in the irradiated areas. Subsequently, the temperature is raised above the transition temperature from the smectic A phase to the cholesteric phase. In the non-polymerized regions, the order will change from smectic to cholesteric, while the smectic order will remain in the polymerized regions. Flood exposure at elevated temperature will freeze the cholesteric order by photopolymerization and produce a patterned optical layer.

example 3

[0097] Biregions are prepared for example according to the methods described by Imura et al., J Photopolym Sci Technol 8, p. 257 (1995) and Schadt et al., Nature 381, p. 212 (1996) or other methods known to those skilled in the art A photoaligned alignment film where the director orientation is determined by the polarization of the UV light used during the two-step UV exposure. Liquid crystal mixture RMM34 (available from Merck) was spin-coated on top of a dual domain light alignment film, eg LPP 265 CP layer. This achieves planar alignment of the active LC monomers. Exposure through a UV mask under a nitrogen atmosphere partially cross-linked the optical layer to freeze into the desired planar state (tilt angle of 0°) required for λ / 4 retardation in the reflective portion of the pixel. The optical layer is then annealed at an elevated temperature for about 10 minutes. During the annealing step, the volatile surfactants in the liquid crystal mixture are evaporated so that a s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A transflective liquid crystal display comprising a plurality of pixels, each pixel comprising a liquid crystal layer (3) sandwiched between a front substrate (1) and a rear substrate (2), and an optical layer (7) comprising a birefringent material , the pixel is divided into at least one transmissive sub-pixel (5) and at least one reflective sub-pixel (4), the optical layer (7) is at least partially sandwiched between the liquid crystal layer (3) and the front substrate (1) or between one of the rear substrates (2) and patterned into regions (8, 9), each region comprising at least partially reflective sub-pixels (4) or at least partially transmissive sub-pixels (5).

Description

technical field [0001] The present invention relates to transflective liquid crystal displays with improved viewing angle dependence and contrast, and more particularly to patterned optical layers for improving viewing angle dependence and contrast of such displays. The invention also relates to methods of manufacturing such displays. Background technique [0002] Liquid crystal displays (LCDs) are used in a wide range of applications, such as televisions, computer monitors, handheld and robotic devices. The operation of LCDs is based on light modulation in a liquid crystal cell (LC cell), which consists of a liquid crystal layer sandwiched between a front substrate and a rear substrate. [0003] LCDs typically operate in one or both of two modes, transmissive and reflective. In a transmissive LCD, light from the backlight is modulated through the LC layer. Due to the backlight, transmissive LCDs are suitable for use in dark environments, such as indoors. An inherent dis...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1335G02F1/13363G02B5/30
CPCG02F2413/09G02F2413/08G02F2202/40G02F2413/04G02F1/13363G02F1/133555G02F2001/133565G02F1/133565G02F1/133631G02F1/1335
Inventor S·J·鲁森达尔E·皮特斯J·鲁布B·M·I·范德詹德C·多尔恩坎普D·K·G·德博尔J·布鲁恩恩克
Owner KONINK PHILIPS ELECTRONICS NV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com