lcd screen temperature range made in china

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.

A diagram of color temperature. As color temperature decreases, white becomes yellow, then red. As color temperature increases, white gradually turns to blue. Note that this diagram is merely a rough representation of how to think about color temperatures, not a precise indication of color temperatures under specific conditions.

Color is expressed as a temperature due to the relationship between the color of light and temperatures when objects are heated to high temperatures. Here we"ll touch briefly on the technical definition of color temperature. First, assume a subject that can completely absorb heat and light, then radiate this energy back out. This object (an idealized object, not one encountered in reality) is a black body, or perfect radiator. Second, assume that this black body radiates light when heated and that the wavelength and spectrum of this light varies with the temperature of the black body. Third, assume that the temperature of the black body when it radiates a certain color of light is also understood to describe that color. This is how color temperature is defined.

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.

If the options for selecting color temperature are "blue" and "red" or "cool" and "warm," choose "red" or "warm" to lower the color temperature and "blue" or "cool" to raise the color temperature. While these options make it easier to understand how the eye will sense the color white, since the user is not given specific Kelvin values, they can be inconvenient when trying to adjust the monitor to a specific color temperature.

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).

Ideally, due to the need to choose the optimal color temperature corresponding to individual applications and circumstances, we should be able to adjust color temperature using Kelvin values. Some major real-world examples are given below.

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.

In the field of video imaging—television, for example—the current standard under Japanese broadcasting standards (NTSC-J) is 9300 K. This is significantly above the 6500 K standard for PC environments. Television pictures actually have a pronounced blue cast. However, most people appear to be accustomed to television and often perceive PC screens as having a reddish cast. Some products offer a picture mode with a color temperature around 9300 K as a "movie" or similar mode. When viewing the picture from a television tuner in a PC environment, one can generally choose a color temperature of 9300 K for color reproduction similar to a home television display.

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.

A color temperature of 5000 K (D50) is standard in the field of desktop publishing (DTP) for printing or publishing. This is the color temperature recommended for lighting by the Japanese Society of Printing Science and Technology when evaluating colors for print applications. While this standard might give a distinct reddish cast to whites in pictures prepared to the standards of television video or similar images, it is intended to reproduce the look printed colors have when viewed under conditions close to direct sunlight.

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.

Based on a special-purpose EX1 sensor and special-purpose software, EasyPIX lets users easily match on-screen and printed colors. This is done by visually comparing the white displayed on screen with the white of the paper and manually adjusting on-screen tint and brightness using the special software until both tints look the same. The special sensor is used to measure on-screen color and to bring it more in line with the white of the paper. EasyPIX also offers functions for adjusting color casts closer to those of natural light or flashbulbs (color temperature: 5500 K) and to standard color casts for Web content and general PC applications (color temperature: 6500 K).

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.

Most high color-rendering fluorescent lamps are tubes, making them difficult to use in most homes without modification. In these cases, we recommend three-wavelength fluorescent lamps, which offer relatively high color-rendering performance for fluorescent lamps and are readily available to the general public. To determine if a fluorescent lamp is a three-wavelength model, simply look at the lamp"s specifications. With respect to the color temperature of the fluorescent lamp itself for evaluating printed materials, a daylight lamp (4600-5400 K) is ideal.

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.

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The PureRelief XL King Size Heating Pad was the consensus favorite pad of our testers and offers features found in no other heating pad that’s similarly priced. The smooth and plush sides of its cover were our testers’ overall favorite, and although it does make a bit more crinkling noise when bending than some, it’s reasonably quiet. The PureRelief’s six levels of heating (between 105 and 140 degrees Fahrenheit) fall within the same general range as other pads’ minimum and maximum levels (give or take 5 degrees) but offer the smallest gaps between temperatures. This addresses a common complaint among the heating pad users on our panel who noted “medium is too low, but high is too hot,” and makes this pad easier to adjust to the right temperature than pads with a narrower range of options and larger jumps between settings. The larger version of this heating pad, the XXL Extra Wide, features the same heating levels and is just as plush, but is nearly double the size.

The PureRelief’s controller is simple to use, allowing you to turn the heat up or down, turn the auto-off timer on or off, and turn the pad on or off. Other pads require you to cycle through settings (such as off/low/medium/high), making it more likely that you’ll accidentally leave the pad on, or just force you to click multiple times to simply go down one level. The PureRelief’s LCD screen has big numbers and backlighting, as opposed to the tiny red lights and lettering on most controllers. The PureRelief cord stays firmly plugged into the pad and will not come loose, unlike the cord on some pads we tested. Its cover dried faster than most pads after washing, it comes with the minor convenience of a storage bag, and it is warrantied for five years.

The PureRelief’s controller has an LCD screen with large, backlit numbers and easy power, timer, and temp up and down controls you could use in the dark. Photo: Rozette Rago

The PureRelief’s controller has an LCD screen with large, backlit numbers and easy power, timer, and temp up and down controls you could use in the dark. Photo: Rozette Rago

One of our long-term testers found that the PureRelief can have problems maintaining temperatures for long periods of time. In their experience, after about 30 minutes of use, the PureRelief tends to cool down, requiring them to increase the number in order to start the heat again.

The Triplett Model RHT22 simultaneously displays Humidity (10 to 99%RH) and Temperature (32 to 122°/0 to 50°C) on a large, easy-to-read LCD. Temperature readings are °F/°C switchable. Read More >

The Triplett Model RHT22 simultaneously displays Humidity (10 to 99%RH) and Temperature (32 to 122°/0 to 50°C) on a large, easy-to-read LCD. Temperature readings are °F/°C switchable. Icons indicate comfortable, wet or dry humidity conditions. Min/Max function with reset records the highest and lowest readings to monitor changing conditions over time. The RHT22 can be placed on a flat surface using its built-in stand or wall mounted in labs, green houses, cleanrooms, warehouses, museums, offices, schools, homes, and virtually anywhere indoor humidity and temperature have to be monitored. Comes complete with AAA battery. 1-year warranty.

The LCD supports normal temperature, wide temperature, and ultra wide temperature. The normal temperature LCD supports 0 ° C to 50 ° C, the wide temperature LCD supports -20 ° C to +70 ° C, and the ultra wide temperature LCD supports -40 ° C to +90 ° C. Usually low temperature performance is good display, its high temperature performance will be poor. The wider the operating temperature range, the higher the price accordingly. Users can choose suitable display products according to the actual use conditions. Wide-temperature LCD refers to the LCD that can work in a wide range of temperatures. Wide-temperature LIQUID crystal displays, also known as active matrix liquid crystal displays, are similar to passive matrices, with transparent electrodes made of indium tin oxide arranged vertically and horizontally on the upper and lower surfaces .Wide temperature display and display sharp contrast is very good, formed a very smooth change, and some main value, let the bright image in the presence of using it in the current good situation, you can also play in a wide range of temperature to the relevant features, and on the basis of good transformation can also be more access to the entire product. Wide temperature LIQUID crystal display has the characteristics of anti-vibration, anti-electromagnetic interference, stable picture quality and wide temperature range.

Wide temperature display can be widely used in military, telecommunications, electric power, metallurgy, machinery, NUMERICAL control, petroleum, chemical, medical, transportation, instrumentation, aerospace and all kinds of field control and monitoring.

They filed a Swiss patent for the idea on Dec. 4, 1970. Though it attracted scant attention at the time, the milestone now stands as the birthdate of the liquid crystal display (LCD) – the technological platform which has transformed consumer electronics and presented a brilliant new way to view the world.

Early LCD developers took a few years to figure out that specialty glass, not plastic, was the best stable substrate for the delicate LCD circuitry and the color backplane component. Once they did, they turned increasingly to Corning to supply them with extraordinarily stable, flat, fusion-formed glass, able to preserve the critical properties of the liquid crystal and withstand high processing temperatures.

And LCDs rapidly transformed from “passive matrix” models, mostly used in pocket calculators and digital watches, to “active matrix” LCDs in which each sub-pixel was controlled with an isolated thin-film transistor. AMLCDs enabled wide viewing angles; brilliant, fast-moving images; and high-resolution images that had never been possible before.

Corning Incorporated was a critical player in this development, and eventually became the world’s leading supplier of LCD glass substrates. And Corning® EAGLE XG® Glass, the world’s first LCD substrate with no arsenic or other heavy metals, went on to exceed sales of 25 billion square feet, making it one of the most successful products in Corning’s history.

Newhaven 40x4 character Liquid Crystal Display shows characters with dark pixels on a bright white background when powered on. This transflective LCD Display is visible with ambient light or a backlight while offering a wide operating temperature range from -20 to 70 degrees Celsius. This NHD-0440WH-ATFH-JT# display has an optimal view of 6:00 and comes English and Japanese standard font. This display operates at 5V supply voltage and is RoHS compliant.

A new production line for advanced LCD screens from Wuhan China Star Optoelectronics Technology Co Ltd will help China"s display panel industry make headway against its foreign competitors, according to industry experts.

The sixth-generation production line will produce low-temperature polysilicon LCD screens using thin film transistors. Located in Wuhan, Hubei province, the high-tech firm will market the displays for smartphones and other mobile devices.

The new facility received major financial support from Shenzhen China Star Optoelectronics Technology Co Ltd, a supplier of LCD displays and subsidiary of TCL Corp, which invested 16 billion yuan ($2.46 billion) in 2014 to establish the production line in the Wuhan East Lake High-tech Development Zone.

Wuhan government officials said it is working to attract a range of companies involved in the manufacturing process of display screens, from suppliers of raw materials to makers of panels, modules and terminal products, to establish offices and facilities in Wuhan.

The officials believe the production line will help the domestic industry catch up with companies in Japan and South Korea, all have dominated the LTPS LCD display market in recent years.

According to Sigmaintell Consulting Co Ltd, demand in China for LTPS LCD panels will increase from 140 million in 2015 to 230 million this year, with its penetration rate rising from 27 percent last year to 39 percent this year.

"The Gen-6 LTPS TFT-LCD production line from Wuhan China Star Optoelectronics will help domestic display manufacturers increase their clout in the field of medium- and high-end mobile phone screens," said Li Yaqin, vice-president of Sigmaintell Consulting.

Fan Boyu, a senior manager for market research firm WitsView, said China"s production capacity of LTPS LCD panels will continue to expand this year as major display producers target the medium- and high-end mobile phone markets, although that could push inventories of screens beyond demand levels, which could compress profits for manufacturers.

Liquid crystal displays (LCD) have become an essential component to the industry of display technology. Involved in a variety of contexts beyond the indoors like LCD TVs and home/office automation devices, the LCD has expanded its usage to many environments, such as cars and digital signage, and, thus, many temperature variations as well.

As with any substance that requires a specific molecular characteristic or behavior, LCDs have an operating temperature range in which the device, if within, can continue to function properly and well. In addition to that, there is also an ideal storage temperature range to preserve the device until used.

This operating temperature range affects the electronic portion within the device, seen as falling outside the range can cause LCD technology to overheat in hot temperatures or slow down in the cold. As for the liquid crystal layer, it can deteriorate if put in high heat, rendering it and the display itself defective.

In order for the LCD panel to avoid defects, a standard commercial LCD’s operation range and storage range should be kept in mind. Without adaptive features, a typical LCD TV has an operating range from its cold limit of 0°C (32°F) to its heat limit of 50°C (122°F) (other LCD devices’ ranges may vary a bit from these numbers).

The storage range is a bit wider, from -20°C (-4°F) to 60°C (140°F). Though these ranges are quite reasonable for many indoor and even outdoor areas, there are also quite a few regions where temperatures can drop below 0°C or rise above 32°C, and in these conditions, LCDs must be adapted to ensure functionality.

Heat, can greatly affect the electronics and liquid crystals under an LCD screen. In consideration of heat, both external heat and internally generated heat must be taken into consideration.

Seen as the liquid crystals are manipulated in a device by altering their orientations and alignments, heat can disrupt this by randomizing what is meant to be controlled. If this happens, the LCD electronics cannot command a certain formation of the liquid crystal layer under a pixel, and the LED backlighting will not pass through as expected, which can often lead to dark spots, if not an entirely dark image. This inevitably disrupts the display’s readability.

Depending on the upper limit of the operation temperature range, LCD device can be permanently damaged by extreme heat. With long exposure to extreme heat, besides the destruction of the liquid crystals, battery life can shorten, hardware can crack or even melt, response time may slow to prevent even more heat generation from the device.

The LED backlight and the internal circuitry, typically TFT-based in the common TFT LCDs, are components that can generate heat that damages the device and its display. To address this concern with overheating, many devices use cooling fans paired with vents.

Some devices that are used in extremely high ambient temperatures may even require air conditioning. With air vents to carry the heat out, the device can expel it into the surroundings.

In the opposite direction is extreme cold. What typically occurs in the cold is “ghosting” (the burning of an image in the screen through discoloration) and the gradual slowing and lagging of response times. Like heat-affected LCD modules, the extreme temperature can affect the liquid crystals. This layer is a medium between the liquid and solid state, so it is still susceptible to freezing.

An LCD device can be left in freezing temperatures because it will likely not be permanently damaged like in the heat, but it is important to understand the device’s limits and how to take precautions when storing the device. The standard and most common lower-bound storage range limit is -20°C, below freezing, but if possible, it would be best to keep it above that limit, or else there is still a risk of permanent damage.

If the device is not adapted for the cold, it would be good to keep it bundled up, trapping the heat within layers. However, this is only a temporary solution. Adapted, rugged devices have advantages such as screen enclosure insulation for heat level preservation and, in more extreme cases, heaters to generate extra heat to raise the internal temperature to a level above the minimum.

When selecting the appropriate module, it is necessary to understand the device’s expected primary application. The application will decide factors such as display type, environmental conditions, whether or not power consumption is a factor, and the balance between performance and cost. These factors can have an effect on the operation and storage temperature ranges for the device.

Display types have a lot of variation. Choices like alphanumeric or graphic LCD, human-machine interactive LCD modules and touchscreen panels capabilities, the width of the viewing angle, level of contrast ratios, types of backlighting, and liquid crystal alignment methods are often considered. For example, the twisted nematic LCD provides for the fastest response time at the lowest cost, but cannot offer the highest contrast ratio or widest viewing angle.

Environment-based factors must consider things besides the obvious temperature like UV exposure and humidity/moisture, as they all are necessary in finding the perfect fit extreme temperature LCD module.

Besides the LCD modules, recent new products have opened doors in wide temperature range displays, such as OLED displays. OLED displays offer better displays in regard to contrast, brightness, response times, viewing angles, and even power consumption in comparison to traditional LCD displays.

These benefits, in addition to its ability to achieve a wide temperature range, provide more options for consumers in search of high quality displays for extreme climates.

Typically, standard LCD modules provide a temperature range of -20°C to +70°C. To meet the need of customers, EVERVISION has developed a series of wide temperature TFT LCD modules with operating temperatures ranging from -30°C to +80°C, and the maximum for some models can reach 85°C.

EVERVISION developed LCD Heater to integrate with our TFT Display Module so that can show optimal view even in low temperature. For materials, heaters can be used with transparent resins, such as glass and poly-carbonate. Our LCD Transparent Heater is made of glass substrate, so we name it “Glass Heater”. It can not only improve the LCD image sticking issue efficiently, but also have heat and humidity resistance advantage.

As the result, it shows 4.3 inch TFT LCD Module display functionally under normal operating conditions. However, there is an overlapping at low temperature, because of LC"s physical characteristics. From this experiment, we know that overlapping can be solved by turning on Glass Heater.

As an LCD display used in outdoor advertising, it has much higher requirements for the use environment than a general display. During the use of outdoor LCD displays, due to different environments, they are often affected by severe weather such as high temperature, typhoons, rainstorms, and thunder and lightning. To keep the display safe and sound in severe weather, what preventive measures should we take?

First, anti-high temperature: Outdoor LCD displays usually have a large area, which consumes a lot of power during the application process, and the corresponding heat dissipation is also large. In addition, the external temperature is relatively high. If the heat dissipation problem cannot be solved in time, it is likely to be Causes problems such as short circuit heating of the circuit board. In production, ensure that the display circuit board is in good condition, and try to choose a hollow design in the housing design to help heat dissipation. During the installation, according to the device situation, insist that the display screen is in a good ventilation condition, and add heat dissipation equipment to the display screen when necessary, like installing an air conditioner or a fan inside to help the display screen dissipate heat.

Second, anti-typhoon: The outdoor LCD display has different installation positions and different installation methods, such as a wall-mounted, inlaid, pillar, and suspended. So in the typhoon season, in order to prevent the screen of the outdoor LCD display from falling, there are strict requirements on the load-bearing steel frame structure of the display. The engineering unit must design and install strictly in accordance with the standards of typhoon resistance, and at the same time have a certain degree of earthquake resistance to ensure that the outdoor LCD display will not fall and cause casualties and other hazards.

Third, anti-torrential rain: There is much rainy weather in the south, so the LCD display itself must have a high level of waterproof protection to avoid rain erosion. In the outdoor environment, the outdoor LCD display must reach the IP65 protection level, the module must be potted and packaged, the waterproof box is selected, and the module and the box are connected with a waterproof rubber ring.

1. Direct lightning protection: If the outdoor large LCD screen is not within the direct lightning protection range of nearby tall buildings, lightning rods must be installed LCD on the top or near the steel structure of the display;

2. Inductive lightning protection: The outdoor LCD display power system is equipped with 1-2 levels of power lightning protection, and the signal line is equipped with signal lightning protection. At the same time, the computer room power system is equipped with 3 levels of lightning protection, and the signal exit/entry equipment in the computer room is added. Install signal lightning protection device;

4. The front end of the outdoor LCD display and the grounding system of the computer room should meet the system requirements. Generally, the front-end grounding resistance should be less than or equal to 4 ohms, and the grounding resistance of the computer room should be less than or equal to 1 ohm.