old lcd monitors hot made in china

Alibaba.com offers 2,564 used computer monitors products. such as call center and on-line technical support, return and replacement, and repair. You can also choose from led, lcd. As well as from new, refurbished, and used. And whether used computer monitors is for business, or for home and student.

Over the years, with the wider and wider application of LCD screens, more and more brand products have been favored by the people. Together, more and more LCD manufacturers have emerged. Of course, the most popular brands in China are BOE, INNOLUX, CHIMEI, AUO, CSOT, etc. So, Which is the best brand of

It is better to say who is more professional than good or bad. In fact, the above mentioned LCD screen manufacturers are very professional, and the quality is guaranteed. But the most popular must be BOE and INNOLUX, these two panel manufacturers are also obvious to all. They all have multiple distributors, but not every distributor has the best size and price.

SZ XIANHENG TECHNOLOGY CO., LTD. is the agent of AUO, BOE, INNOLUX, SHARP, IVO and Mitsubishi, and other domestic and foreign well-known brands of small and medium-sized LCD display; specializing in customized production of touch screen display, LCD and industrial touch display and other high-tech products. According to the needs of customers, we can provide various LCD products: high-brightness LCD screen, LCD driver board, touch screen, booster board, all kinds of LCD special wires, etc. to produce industrial displays.

What brand of LCD screen is good? If you choose BOE, INNOLUX, CHIMEI, AUO or CSOT, you can buy them from us. 18.5 inch LCD screen, 21.5 inch LCD screen and other small and medium size, our price is the lowest in the industry.

* Avionics: Provide brilliant color and clarity for data or graphic applications for rugged flat panel monitors. Color active matrix technology gives low power consumption and distortion flicker free images. High resolution, good contrast ratios and very wide viewing angles. Mechanical and electronic interface guaranteed for easy mounting and connection to customer equipment.

* Professional service for global clients. Neway uses brand new LCD SCREEN from LG,SHARP,CHIMEI INNOLUX,SAMSUNG etc to produce our products, not only monitors, but also Panel PC.

A backlight is a form of illumination used in liquid crystal displays (LCDs). As LCDs do not produce light by themselves—unlike, for example, cathode ray tube (CRT), plasma (PDP) or OLED displays—they need illumination (ambient light or a special light source) to produce a visible image. Backlights illuminate the LCD from the side or back of the display panel, unlike frontlights, which are placed in front of the LCD. Backlights are used in small displays to increase readability in low light conditions such as in wristwatches,smart phones, computer displays and LCD televisions to produce light in a manner similar to a CRT display. A review of some early backlighting schemes for LCDs is given in a report Engineering and Technology History by Peter J. Wild.

Simple types of LCDs such as in pocket calculators are built without an internal light source, requiring external light sources to convey the display image to the user. Most LCD screens, however, are built with an internal light source. Such screens consist of several layers. The backlight is usually the first layer from the back. Light valves then vary the amount of light reaching the eye, by blocking its passage in some way. Most use a fixed polarizing filter and a switching one, to block the undesired light.

Backlights come in many colors. Monochrome LCDs typically have yellow, green, blue, or white backlights, while color displays use white backlights that cover most of the color spectrum.

Colored LED backlighting is most commonly used in small, inexpensive LCD panels. White LED backlighting is becoming dominant. ELP backlighting is often used for larger displays or when even backlighting is important; it can also be either colored or white. An ELP must be driven by relatively highAC power, which is provided by an inverter circuit. CCFL backlights are used on larger displays such as computer monitors, and are typically white in color; these also require the use of an inverter and diffuser. Incandescent backlighting was used by early LCD panels to achieve high brightness, but the limited life and excess heat produced by incandescent bulbs were severe limitations. The heat generated by incandescent bulbs typically requires the bulbs to be mounted away from the display to prevent damage.

For several years (until about 2010), the preferred backlight for matrix-addressed large LCD panels such as in monitors and TVs was based on a cold-cathode fluorescent lamp (CCFL) by using two CCFLs at opposite edges of the LCD or by an array of CCFLs behind the LCD (see picture of an array with 18 CCFLs for a 40-inch LCD TV). Due to the disadvantages in comparison with LED illumination (higher voltage and power needed, thicker panel design, no high-speed switching, faster aging), LED backlighting is becoming more popular.

LED backlighting in color screens comes in two varieties: white LED backlights and RGB LED backlights.blue LED with broad spectrum yellow phosphor to result in the emission of white light. However, because the spectral curve peaks at yellow, it is a poor match to the transmission peaks of the red and green color filters of the LCD. This causes the red and green primaries to shift toward yellow, reducing the color gamut of the display.a red, a blue, and a green LED and can be controlled to produce different color temperatures of white. RGB LEDs for backlighting are found in high end color proofing displays such as the HP DreamColor LP2480zx monitor or selected HP EliteBook notebooks, as well as more recent consumer-grade displays such as Dell"s Studio series laptops which have an optional RGB LED display.

RGB LEDs can deliver an enormous color gamut to screens.additive color) the backlight can produce a color spectrum that closely matches the color filters in the LCD pixels themselves. In this way, the filter passband can be narrowed so that each color component lets only a very narrow band of spectrum through the LCD. This improves the efficiency of the display since less light is blocked when white is displayed. Also, the actual red, green, and blue points can be moved farther out so that the display is capable of reproducing more vivid colors.

A newNanosys, claims that the color output of the dots can be tuned precisely by controlling the size of the nanocrystals. Other companies pursuing this method are Nanoco Group PLC (UK), QD Vision, 3M a licensee of Nanosys and Avantama of Switzerland.Sony has adapted Quantum Dot technology from the US company QD Visionedge-lit LED backlight marketed under the term Triluminos in 2013. With a blue LED and optimized nanocrystals for green and red colors in front of it, the resulting combined white light allows for an equivalent or better color gamut than that emitted by a more expensive set of three RGB LEDs. At the Consumer Electronics Show 2015, Samsung Electronics, LG Electronics, the Chinese TCL Corporation and Sony showed QD-enhanced LED-backlighting of LCD TVs.

CCFL backlighting has also improved in this respect. Many LCD models, from cheap TN-displays to color proofing S-IPS or S-PVA panels, have wide gamut CCFLs representing more than 95% of the NTSC color specification.

The use of LED backlights in notebook computers has been growing. Sony has used LED backlights in some of its higher-end slim VAIO notebooks since 2005, and Fujitsu introduced notebooks with LED backlights in 2006. In 2007, Asus, Dell, and Apple introduced LED backlights into some of their notebook models. As of 2008Lenovo has also announced LED-backlit notebooks. In October 2008, Apple announced that it would be using LED backlights for all of its notebooks and new 24-inch Apple Cinema Display, and one year later it introduced a new LED iMac, meaning all of Apple"s new computer screens are now LED. Almost every laptop with a 16:9 display introduced since September 2009 uses LED-backlit panels. This is also the case for most LCD television sets, which are marketed in some countries under the misleading name LED TV, although the image is still generated by an LCD panel.

Most LED backlights for LCDs are edge-lit, i.e. several LEDs are placed at the edges of a lightguide (Light guide plate, LGP), which distributes the light behind the LC panel. Advantages of this technique are the very thin flat-panel construction and low cost. A more expensive version is called full-array or direct LED and consists of many LEDs placed behind the LC panel (an array of LEDs), such that large panels can be evenly illuminated. This arrangement allows for local dimming to obtain darker black pixels depending on the image displayed.

For a non-ELP backlight to produce even lighting, which is critical for displays, the light is first passed through a lightguide (Light guide plate, LGP) - a specially designed layer of plastic that diffuses the light through a series of unevenly spaced bumps. The density of bumps increases further away from the light source according to a diffusion equation. The diffused light then travels to either side of the diffuser; the front faces the actual LCD panel, the back has a reflector to guide otherwise wasted light back toward the LCD panel. The reflector is sometimes made of aluminum foil or a simple white-pigmented surface.

The LCD backlight systems are made highly efficient by applying optical films such as prismatic structure to gain the light into the desired viewer directions and reflective polarizing films that recycle the polarized light that was formerly absorbed by the first polarizer of the LCD (invented by Philips researchers Adrianus de Vaan and Paulus Schaareman),

Dimming options for LCD brightness; J. Moronski; Electronicproducts.com; 3 Januari 2004; "Dimming options for LCD brightness control". March 2004. Archived from the original on 2017-07-28. Retrieved 2017-11-20.

LCD Television Power Draw Trends from 2003 to 2015; B. Urban and K. Roth; Fraunhofer USA Center for Sustainable Energy Systems; Final Report to the Consumer Technology Association; May 2017; "Archived copy" (PDF). Archived from the original (PDF) on 2017-08-01. Retrieved 2017-11-20.link)

In this article, we"ll focus on color temperature, a fundamental parameter in picture quality adjustments. While color temperature dramatically affects the picture quality of an LCD monitor, more often than not, people simply use the default settings. A good understanding of the meaning of color temperature will enable better adjustments of LCD monitor picture quality.

Note: Below is the translation from the Japanese of the ITmedia article "Altering a color dramatically with a single setting: Examining color temperature on an LCD monitor" published March 30, 2009. Copyright ITmedia Inc. All Rights Reserved.

Most of today"s LCD monitors feature color-temperature adjustment options in their OSD menus. Since color temperature settings affect color reproduction significantly on an LCD monitor, if a user wants to display an image with the appropriate color cast, he or she must choose the correct color temperature.

We"ll start with a brief explanation of the meaning of color temperature. Color temperature refers to the color of light, serving as the standard index for color balance for a range of products, including monitors, cameras, and lighting equipment. Color temperature is specified in units of Kelvin (K) of absolute temperature, not the degrees Celsius (C) used to express the temperature of air and other materials. While Kelvin is less familiar that Celsius, it should present no problems if we keep the following two basic points in mind: the lower the Kelvin value for color temperature, the redder a white object appears; the higher the color temperature, the bluer it appears.

The tables below indicate rough color temperatures for various lighting sources, including sunlight. As you can probably guess, lower color temperatures mean redder light, while higher temperatures mean bluer light. Most photographers shooting pictures with digital SLR cameras might set their white balance to 5000-5500 K. Since daylight has a color temperature of 5000-5500 K, setting the white balance to this figure makes it possible to capture photos with color reproduction close to that perceived by the eye.

While any object will radiate various light frequencies when heated to high temperature, the temperature at which the light becomes a certain color differs from object to object. For this reason, a black body is an idealized object, used to generate standard values by matching specific colors of radiated light to specific temperatures. While this is a complex topic with detailed explanations grounded in physics and mathematics, we do not need to understand this in depth to adjust the color temperature of an LCD monitor. Anyone with a deeper interest is encouraged to consult reference works.

As mentioned in passing at the start of this session, most current LCD monitors allow users to adjust color temperatures using the OSD menu. As we would expect, reducing the color temperature on an LCD monitor gives the entire screen an increasingly reddish cast, while increasing the color temperature makes the color cast increasingly blue. The menu items for adjusting color temperature vary from product to product. Some ask users to choose from terms like "blue" and "red" or "cool" and "warm"; others ask users to set numerical values like 6500 K or 9300 K.

It helps to be able to specify precise Kelvin values when we adjust the picture quality of an LCD monitor. For example, on most EIZO LCD monitors, users can choose from about 14 levels (in 500-K intervals from 4000 to 10,000 K, plus 9300 K). This is industry-leading precision. Some other LCD monitors allow users to designate color temperature by Kelvin value. Most offer significantly fewer options in the OSD menu: 5000, 6500, and 9300 K, for example.

On most EIZO LCD monitors, users can adjust color temperature precisely from the OSD menu in 500-K intervals (photo at left). Using the bundled ScreenManager Pro software for LCD monitors to configure various display settings from the PC, users can easily adjust color temperatures simply by moving the position of a slider at the top of the screen (photo at right).

A color temperature of 6500 K is standard for ordinary PC use and for the sRGB standard. Most LCD monitors offer a setting of 6500 K among their color temperature options. If a monitor offers an sRGB mode, setting it to this mode should present no problems. In most cases, even products whose color-temperature settings use terms like "blue" and "red" will be adjusted to close to 6500 K for standard mode, although accuracy may be lacking. The LCD monitors on some laptop PCs are set to higher color temperatures.

On the other hand, the U.S. broadcasting standard (NTSC) calls for a color temperature standard of 6500 K. The international standard for digital high-definition television (ITU-R BT.709) also specifies a color temperature of 6500 K. When watching video on a PC, users should set the LCD monitor"s color temperature between 6500 K and 9300 K, checking for differences in color reproduction.

As a rule of thumb, most Japanese film titles assume a 9300 K environment, while non-Japanese films assume a 6500 K environment. This means one is highly likely to achieve color reproduction close to that intended by filmmakers by setting the color temperature of an LCD monitor to 9300 K when viewing a Japanese film and 6500 K when viewing a non-Japanese film. (Naturally, this doesn"t apply universally.) When using a model with a wide range of choices in Kelvin values—an Eizo Nanao LCD monitor, for example—users can adjust the color temperature to whatever looks best.

Sample display of white under the color temperatures 5000, 6500, and 9300 K (from left). Since the photo was shot with the color temperature of the digital camera set to 6500 K, white in the 6500 K image in the center appears pure white. It appears red in the 5000 K image and blue in the 9300 K image. Naturally, when changing the color temperature setting for the camera, the look of whites in those images will be shifted accordingly: the image with a color temperature lower than the set value will appear reddish and the one with a higher color temperature will look bluish.

Sample color bars displayed at color temperatures 5000, 6500, and 9300 K (from left). The photo was shot under the same conditions as the photo above. As color temperatures change, the apparent color of the white, or the overall color balance, is affected. Colors at lower color temperatures tend to appear warm; at higher color temperatures, they tend to appear cool.

The preceding page explained the basics needed to set the correct color temperature based on the intended application. However, for applications like retouching digital photographs or color adjustments for printing or video editing, where users are professionals or high-end amateurs for whom color reproduction significantly affects the final quality of the work, managing LCD color temperatures with greater accuracy is critical. If colors differ between the output of photo retouching and the color reproduction in printing, or colors appear unnatural when a video is viewed on another computer, it could not only impair the work itself, but also significantly reduce the efficiency of image processing.

Addressing these demands adequately requires an LCD monitor that supports color management based on hardware calibration. A hardware calibration system uses a color sensor to measure colors on screen and controls the look-up table (LUT) in the LCD monitor directly. This makes it possible to correct for differences in color temperature attributable to differences between individual LCD monitor units or to an aging display and to generate accurate colors, an important feature when handling color.

Here we"ll use an EIZO LCD monitor with a good reputation for enabling high-precision color management to briefly explain the knowledge and specialized tools required to work with color temperatures at a deeper level. We also recommend reading the articles below for more information on hardware calibration, color gamut, and look-up tables.

EIZO offers the ColorEdge series of color management-capable LCD monitors. All models in the ColorEdge series support hardware calibration, allowing users to manage in detail all aspects of color reproduction, including screen color temperature and color gamut.

Designed for advanced color management, the ColorNavigator software is bundled with all models in the ColorEdge series. ColorNavigator offers a wide range of functions, including a function for matching the color temperature of the LCD monitor with the white of a particular paper. Using a color sensor (sold separately), users can measure a white point on the paper and set this to white when performing a hardware calibration of the LCD monitor. This makes it possible to precisely match the on-screen white and the paper white, ensuring that colors on screen are very close to those on the printed paper.

ColorNavigator also offers an advanced function for emulating any color gamut. This lets users reproduce on screen, with high precision, the Adobe RGB, sRGB, or NTSC color gamut, using a wide color-gamut panel. ColorNavigator can also be set to emulate color gamuts by reading existing ICC profiles, rather than relying on preset software gamuts. For example, for commercial applications, emulating the client"s LCD monitors using their ICC profiles lets users streamline the color-proofing workflow by reproducing the color reproduction of the client"s monitors on a ColorEdge monitor.

ColorNavigator also features functions that encourage users to perform periodic hardware calibration of their LCD monitors and to maintain accurate color reproduction through precise manual adjustments. Since screen brightness and color reproduction change as a monitor is used over many years, color temperatures will also change. In applications for which accurate color reproduction is paramount, merely selecting preset color-temperature settings is not enough. It"s a good idea to perform hardware calibration once a month or so.

In addition to adjusting LCD monitors with special tools like ColorNavigator or EasyPIX, one should closely examine worksite (environmental) lighting and LCD hoods.

Most worksites use fluorescent lighting. Some fluorescent lighting is suitable for working with color; others are not. The majority of fluorescent lights sold to the general public are not suitable for color work. Ordinary fluorescent lights have a highly biased light spectra, and color divergence is readily apparent if we compare the LCD monitor screen to paper. Accurately printed colors, for example, may appear greenish under fluorescent light.

Fluorescent lights suitable for working with color are known as high color-rendering fluorescent lamps or fluorescent lights for color evaluation. These lamps feature light spectra similar to the sun and generate very little color divergence between the LCD monitor screen, printed paper, and human color recognition. Color rendering describes the color an object appears to have under a certain light. Color-rendering performance is expressed in terms of the average color-rendering index (Ra). An Ra value of 100 means the lighting is identical to natural light. The closer the value to Ra, the higher the color-rendering performance. The International Commission on Illumination (CIE) recommends fluorescent lighting with an Ra of 90 or above at locations where art is viewed or colors evaluated.

An LCD hood is attached to the top and sides of an LCD monitor to reduce the effects of environmental lighting on the screen display and to make it possible to view the true screen colors while working.

An LCD hood specially designed as an option for an LCD monitor is ideal, but if no such option is available, the user can make an LCD hood by cutting a piece of cardboard, plastic sheet, or polystyrene board to the size of the display and painting the entire surface facing the LCD monitor screen matte black to minimize light reflections. In the end, the hood simply needs to block environmental light from reaching the screen of the LCD monitor and not reflect display light back onto the screen. Make sure the hood doesn"t also block the heat release vents on the LCD monitor; heat buildup inside the monitor can damage the unit.

We"ve examined some basic aspects of color temperature and of using and adjusting color temperatures on an LCD monitor. The color cast of an LCD monitor varies dramatically with color temperature settings—the difference is hard to miss. If you"ve used nothing but your monitor"s default settings up to this point, we encourage you to explore the OSD menu and see how colors change at different color temperature settings. While 6500 K, sRGB mode, or "standard" mode is recommended for general PC use, you might find that you prefer a different color temperature for watching films, playing computer games, or other uses.