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

Liquid crystal display device

A technology of liquid crystal display device and liquid crystal display element, which is applied to identification devices, static indicators, optics, etc., can solve problems such as difficulty in reducing contrast ratio, easy blackening of displayed images, and blurred vision.

Inactive Publication Date: 2004-09-29
SHARP KK
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the actual viewing angle characteristics in the positive viewing angle direction are opposite to those in the negative viewing angle direction, it is difficult to uniformly suppress the decrease in contrast in the vertical direction even if the optical retardation film is combined with the above-mentioned pixel division method.
In particular, when the viewing angle is tilted toward the normal viewing angle direction, there is a tendency that an inversion phenomenon occurs, or the displayed image tends to become black and difficult to see clearly.

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
  • Liquid crystal display device
  • Liquid crystal display device
  • Liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] In this example, as shown in FIG. 6 , the viewing angle dependence of the liquid crystal display device was measured using a measurement system including a light receiving element 21 , an amplifier 22 and a recording device 23 . The liquid crystal cell 16 of the liquid crystal display device is installed so that the surface 16a on the side of the glass substrate 9 is located on the reference plane x-y of the orthogonal coordinates xyz. The light-receiving element 21 is an element capable of receiving light at a constant three-dimensional light-receiving angle, and is arranged at a predetermined distance from the coordinate origin in a direction forming an angle Φ (viewing angle) with respect to the z direction perpendicular to the surface 16a.

[0115]In the measurement, the liquid crystal cell 16 installed in the measurement system was irradiated with monochromatic light having a wavelength of 550 nm from the surface opposite to the surface 16 a. Part of the monochroma...

Embodiment 2

[0132] In the present embodiment, seven samples #11 to #17 were prepared. Among the samples, as the alignment films 11 and 14 of the liquid crystal cell 16 of the liquid crystal display device of FIG. Name), as the liquid crystal layer 8, adopted the liquid crystal material that is 2.0 °, 4.0 °, 6.0 °, 8.0 °, 14.0 °, 15.0 °, 16.0 ° with respect to the pretilt angle of above-mentioned alignment film 11,14, cell thickness ( The thickness of the liquid crystal layer 8) is 5 μm. The ratio of the first divided portion 8 a : the second divided portion 8 b of the liquid crystal layer 8 is assumed to be 17:3.

[0133] The measurement of the pretilt angles of these samples #11 to #17 was prepared by preparing homogeneous units filled with the materials of samples #11 to #17 and using an NSMAP-3000LCD pretilt angle measuring device (manufactured by Sigma Optical Equipment Co., Ltd.) measured.

[0134] As the optical retardation films 2 and 3 of the samples #11 to #17, the same optical...

Embodiment 3

[0202] In the present embodiment, prepared 3 samples #21~#23, in the sample as the orientation film 11,14 of the liquid crystal cell 16 of the liquid crystal display device of Fig. name), as the liquid crystal layer 8 (division ratio 17:3), the pretilt angle relative to the above-mentioned alignment films 11, 14 is 6°, and the refractive index anisotropy Δn(550) at a wavelength of 550 nm is set as For liquid crystal materials of 0.070, 0.080, and 0.095, the cell thickness (the thickness of the liquid crystal layer 8 ) is 5 μm.

[0203] In addition, the measurement of the pretilt angle prepared the homogeneous cell filled with the material of sample #21-#23, and measured it with NSMAP-3000 pretilt angle measuring apparatus.

[0204] As the optical retardation films 2 and 3 of samples #21 to #23, the same optical retardation films 2 and 3 in which disco-teik liquid crystals were obliquely oriented as in the above-mentioned Example 1 were used.

[0205] The above-mentioned sampl...

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

The purpose of the invention is to provide a liquid crystal display device for displaying images of high quality which not only eliminates the inversion in, but also removes the phase difference associated with the viewing angle, inversion of gradation is not caused in the direction out of the viewing angle. To achieve this goal, at least one sheet of optical phase difference plates 2, 3 is inserted between a pair of polarizing plates 4, 5 on both sides of said liquid crystal display device. Partitioning the liquid crystal display layers with different ratios and orient them in each anisotropic direction; Furthermore, when a pretilt angle is defined as the angle between the major axis of the liquid crystal molecule and the orienting film, the pretilt angle on the liquid crystal layer is controlled to such a range that when a voltage near the threshold voltage of the liquid crystal is applied to produce a medium tone display state, inversion of gradation is not caused in the direction out of the viewing angle.

Description

technical field [0001] The present invention relates to a liquid crystal display device, especially a liquid crystal display device in which the viewing angle dependence of a display screen is improved by combining an optical retardation plate with a liquid crystal display element. Background technique [0002] In the past, liquid crystal display devices using nematic liquid crystal display elements were widely used in digital segment display devices such as clocks and desktop electronic calculators, but recently they are also used in word processors, notebook personal computers, and automotive LCD TVs. Wait. [0003] A liquid crystal display element generally has a light-transmitting substrate, and electrode lines and the like for turning on and off pixels are formed on the substrate. For example, in an active matrix liquid crystal display device, active elements such as thin film transistors are formed on the above-mentioned substrate together with the above-mentioned ele...

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
IPC IPC(8): G02F1/133G02F1/1335G02F1/13363G02F1/1337G09F9/35
CPCG02F1/133753G02F2413/10G02F1/133632G02F1/133634
Inventor 山原基裕水繁光
Owner SHARP KK
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