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Topic: Liquid crystal display


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LCD

In the News (Sun 21 Jul 19)

  
  Patents in Class 349/187
An LCD device and a method of manufacturing the same are disclosed, in which a sealant concentrated upon the end of a dispensing device is formed in a dummy region on a substrate, so that a liquid crystal layer is not contaminated when b...
An LCD device and a method of manufacturing the same are disclosed, which prevents a liquid crystal from being filled imperfectly or excessively in an active region, thereby obtaining a uniform cell gap and improving picture quality char...
A liquid crystal display and a method of fabricating such a liquid crystal display wherein a buffer layer having a hydrophilic property is formed at normal (atmospheric) pressure on the exposed surface of a hydrophobic organic passivatio...
www.freepatentsonline.com /CCL349-187.html   (2533 words)

  
 How liquid crystal display (lcd) is made - Background, Raw materials, The manufacturing process of liquid crystal ...
The basis of LCD technology is the liquid crystal, a substance made of complicated molecules.
In an LCD, an electric current is used to switch segments of liquid crystals from a transparent phase to a cloudy phase, each segment forming part of a number or letter.
Most LCDs today also use a source of light coming from the rear of the display (backlight), such as a fluorescent light, to make the liquid crystal appear darker against the screen when in its cloudy phase.
www.madehow.com /Volume-1/Liquid-Crystal-Display-LCD.html   (2181 words)

  
 The First HP Liquid Crystal Display
The display used in the HP-41C is a multiplexed, twisted nematic LCD with a twelve-character alphanumeric capacity.
The ability of a display to perform at low temperature is usually limited by increasing viscosity and attendant slower on-off response, and not by freezing of the liquid.
Liquid crystal fills the space between the plates, and the molecules are oriented with their directors in the plane of the substrate.
www.hpmuseum.org /journals/hp41/41lcd.htm   (1209 words)

  
 Howstuffworks "How LCDs Work"
We think of a crystal as a solid material like quartz, usually as hard as rock, and a liquid is obviously different.
This means that liquid crystals are neither a solid nor a liquid.
This explains why liquid crystals are very sensitive to temperature and why they are used to make thermometers and mood rings.
www.howstuffworks.com /lcd.htm   (444 words)

  
  Liquid Crystal display temperature range
The liquid crystal fluid used in the display, and
The liquid crystal fluid in the display is of prime importance.
The temperature specifications for all LCD fluids are shown in the manufacturers data sheet.
www.liquidcrystaltechnologies.com /TempRange.htm   (695 words)

  
  Liquid crystal display
A nit is a unit of luminance which is often used to quote the brightness of displays, which typically have luminances of 200 to 300 nits.
In a colour LCD each pixel is divided into three sections, one with a red filter, one with a green filter and the other with a blue filter.
LCDs with a small number of segments, such as those used in digital watches[?] and pocket calculators, are supplied with one electrical contact for each segment.
www.ebroadcast.com.au /lookup/encyclopedia/lc/LCD.html   (765 words)

  
  Liquid crystal display - Wikipedia, the free encyclopedia
Each pixel consists of a layer of liquid crystal molecules suspended between two transparent electrodes, and two polarizing filters, the axes of polarity of which are perpendicular to each other.
When an electrical charge is applied to the electrodes, the molecules of the liquid crystal are pulled parallel to the electric field, thus reducing the rotation of the entering light.
LCD displays generally have a lower contrast ratio than that on a plasma display or CRT.
en.wikipedia.org /wiki/Liquid_crystal_display   (2866 words)

  
 LCD
Liquid crystals were observed as long ago as the 1850s, during experiments on human nerve fibres, where they were found in myelin - the nerve system's natural insulation system.
In a normal liquid, molecules are randomly arranged; but the molecules of a warmed liquid crystal retain some of their original orderliness - just enough order for the liquid crystal to retain the optical properties of a solid.
The phospholipids at this pressure retain enough liquid crystal structure at the ambient temperature to provide a strong cell membrane capable of withstanding the strain.But when the bacterium is brought to the surface, the pressure drop changes the critical temperature at which the liquid crystal cell walls can maintain their structure.
www.geocities.com /Omegaman_UK/lcd.html   (2753 words)

  
 Liquid crystal display television - Wikipedia, the free encyclopedia
Liquid crystal display television (LCD TV) is a television using LCD technology for its visual output.
LCD technology is based on the properties of polarized light.
First, the backlight of the LCD panel may be fired during a shorter period of time than the refresh period, preferably as short as possible, and preferably when the pixel has already settled to the intended brightness.
en.wikipedia.org /wiki/Liquid_crystal_display_television   (1092 words)

  
 Encyclopedia :: encyclopedia : Liquid crystal display   (Site not responding. Last check: 2007-11-02)
Each pixel (picture element) consists of a column of liquid crystal molecules suspended between two transparent electrodes, and two polarizing filters, the axes of polarity of which are perpendicular to each other.
When an electrical charge is applied to the electrodes, the molecules of the liquid crystal align themselves parallel to the electric field, thus limiting the rotation of entering light.
In 1969, the twisted nematic field effect in liquid crystals was discovered by James Fergason at Kent State University, and in 1971 his company ILIXCO (now LXD Incorporated) produced the first LCDs based on it, which soon superseded the poor-quality DSM types.
www.hallencyclopedia.com /Liquid_crystal_display   (1960 words)

  
 [No title]   (Site not responding. Last check: 2007-11-02)
A nit is a unit of luminance which is often used to quote the brightness of displays, which typically have luminances of 200 to 300 nits.
In a colour LCD each pixel is divided into three sections, one with a red filter, one with a green filter and the other with a blue filter.
LCDs with a small number of segments, such as those used in digital watches and pocket calculators, are supplied with one electrical contact for each segment.
wikiwhat.com /encyclopedia/l/li/liquid_crystal_display.html   (922 words)

  
 liquid crystal display from FOLDOC   (Site not responding. Last check: 2007-11-02)
The heart of the liquid crystal display is a piece of liquid crystal material placed between a pair of transparent electrodes.
The liquid crystal changes the phase of the light passing through it and this phase change can be controlled by the voltage applied between the electrodes.
Liquid crystal displays are formed by integrating a number of such cells, or more usually, by using a single liquid crystal plate and a pattern of electrodes.
foldoc.org /?liquid+crystal+display   (378 words)

  
 Liquid crystal display patent invention
Homeotropic alignment is a liquid crystal phase in which a voltage is applied to liquid crystal and all long axes of liquid crystalline molecules (hereinafter called "liquid crystal axes" are aligned along the direction of electric field.
When an adequate voltage is applied to a liquid crystal layer in the planar state, the liquid crystal layer shows a focal conic state in which the liquid crystal layer aligns the spiral axis parallel to the substrate.
Before a voltage applied, the liquid crystal is in the planar state and the reflectance is R.sub.P. A pulse voltage of, for example, 5 ms width is applied to liquid crystal cell 10 from power supply 9.
www.freshpatents.com /Liquid-crystal-display-dt20060907ptan20060197728.php   (1870 words)

  
 Liquid crystal display patent invention   (Site not responding. Last check: 2007-11-02)
This type of display, known as the so-called actively driven display, is represented by a twisted nematic (TN) display which works on optical rotation of the liquid crystal molecules constituting the liquid crystal layer.
It works on birefringence produced in the liquid crystal layer by its liquid crystal molecules rotating essentially in parallel to the substrate, where an electrical field generated by an inter-digital electrode provided on one of a pair of the substrates is designed to have a component running essentially in parallel to the substrate surface.
This type of display has a significantly narrower margin for alignment treatment of a liquid crystal alignment layer than a conventional TN type, in particular a normally open type displaying bright images at a low voltage and dark images at a high voltage, which is now a prevailing type.
www.freshpatents.com /Liquid-crystal-display-dt20051208ptan20050271833.php   (1440 words)

  
 [No title]
LCD or LC Shutter glasses are liquid crystal lenses that block out the light on each eye respectively.
The earliest digital displays were very crude, but when engineers wanted information as a number, as opposed to a needle position on a scale, they had to devise some way to display numeric digits.
In such a liquid crystal display, either a plurality of the gate lines or a plurality of the drain lines are made of a Cr alloy containing at least one kind selected from a group consisting of Mo, Nb, Ta and W. Source:
lycos.com /info/liquid-crystal-display.html   (732 words)

  
 Liquid crystal display Summary
This type of LCD can produce darker 'fls' than the transmissive type since light must pass through the liquid crystal layer twice and thus is attenuated twice, however because the reflected light is also attenuated twice in the translucent parts of the display image contrast is usually poorer than a transmissive display.
LCD displays generally have a lower contrast ratio than that on a plasma display or CRT.
LCDs have longer response time than their plasma and CRT counterparts, creating ghosting and mixing when images rapidly change; this drawback, however, is continually improving as the technology progresses and is impercetible in current LCD Computer Displays and TV's.
www.bookrags.com /Liquid_crystal_display   (3157 words)

  
 Liquid crystal display patent invention   (Site not responding. Last check: 2007-11-02)
This type of display, known as the so-called actively driven display, is represented by a twisted nematic (TN) display which works on optical rotation of the liquid crystal molecules constituting the liquid crystal layer.
It works on birefringence produced in the liquid crystal layer by its liquid crystal molecules rotating essentially in parallel to the substrate, where an electrical field generated by an inter-digital electrode provided on one of a pair of the substrates is designed to have a component running essentially in parallel to the substrate surface.
This type of display has a significantly narrower margin for alignment treatment of a liquid crystal alignment layer than a conventional TN type, in particular a normally open type displaying bright images at a low voltage and dark images at a high voltage, which is now a prevailing type.
freshpatents.com /Liquid-crystal-display-dt20051208ptan20050271833.php   (1449 words)

  
 Liquid Crystal Display -- LCD's
By controlling the twist of the liquid crystals in each pixel, light can be allowed to pass though in varying amounts, correspondingly illuminating the pixel.
This type of LCD has higher contrast than the transmissive type since light must pass through the liquid crystal layer twice and thus is attenuated twice.
This type of display is called a passive matrix because the pixel must retain its state between refreshes without the benefit of a steady electrical charge.
www.edinformatics.com /inventions_inventors/lcd.htm   (1321 words)

  
 Liquid Crystal
Liquid crystal is a fourth ``state'' that certain kinds of matter can enter into under the right conditions.
In cholesteryl myristate, the latent heat for changing from a solid to the liquid crystal state is 65 calories per gram, whereas the latent heat for the liquid crystal to liquid transition is only 7 calories per gram.
Liquid crystal behaves differently depending on what direction electric or magnetic fields are applied relative to the director.
web.media.mit.edu /~stefan/liquid-crystals/node2.html   (1321 words)

  
 liquid-crystal display
Display of numbers (for example, in a calculator) or pictures (such as on a pocket television screen) produced by molecules of a substance in a semi-liquid state with some crystalline properties, so that clusters of molecules align in parallel formations.
The display is a blank until the application of an electric field, which ‘twists’ the molecules so that they reflect or transmit light falling on them.
LCD manufacture has advanced significantly and LCDs are now used in making colour mobile phone displays, computer monitors, and television displays.
www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0016763.html   (251 words)

  
 Howstuffworks "How LCDs Work"
This means that liquid crystals are neither a solid nor a liquid.
It turns out that liquid crystals are closer to a liquid state than a solid.
This explains why liquid crystals are very sensitive to temperature and why they are used to make thermometers and mood rings.
electronics.howstuffworks.com /lcd.htm   (456 words)

  
 Liquid crystal display - Gurupedia
Before an electric field is applied, the long, thin molecules in the liquid are in a relaxed state.
Light is polarised by one sheet, rotated through the smooth twisting of the crystal molecules, then passes through the second sheet.
Zero-power LCD displays are in competition with electronic paper.
www.gurupedia.com /l/lc/lcd.htm   (925 words)

  
 Liquid Crystal Display Materials and Related Technologies   (Site not responding. Last check: 2007-11-02)
Niopik and Switzerland's Hoffmann-LaRoche (itself a liquid crystal supplier) have a collaboration with Martin Schadt, a contributor to the world patent for TN displays (expired 1991) who is world famous for his structure-property expertise, the relationship between macroscopic properties of liquid crystals and molecular structure (Schadt 1993).
The orientation of the liquid crystal optic axis at the substrate is determined by mechanically buffing the alignment layer.
When a liquid crystal is sandwiched between glass slides that have been treated in this manner, its optic axis is perpendicular to the direction of the polarization used to arrange the chemical groups.
www.wtec.org /loyola/displays/c2_s5.htm   (2297 words)

  
 Liquid Crystal Display
First, the LCD is composed of many thousands of transistors which are mounted on a thin transparent surface.
Each LCD has what is known as a native resolution, a number that indicates the actual number of transistors in that particular LCD display.
The best LCD display occurs when it is presented with a digital signal from the graphics board.
www.gulfcoastcomputing.com /2003/may2003/LCD_May2003.htm   (1395 words)

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