lcd screen heat quotation

Alibaba.com offers 1963 heat resistant lcd products. About 1% % of these are assembly line, 1%% are other machinery & industrial equipment, and 1%% are lcd monitors.

A wide variety of heat resistant lcd options are available to you, You can also choose from original manufacturer, odm and retailer heat resistant lcd,

LC displays (LCD) have a well-defined isotropic or operating temperature limit, above which the actual liquid crystal molecules will lose their orientation and will assume a random orientation instead of ‘twisting’ through the light valve.

The site goes on to note that temperatures above 100°C (212°F) can permanently damage the coating on LCD displays, though Samsung claims that storing your display at temperatures above 45°C (113°F) can damage it, so it"s possible that Vartech"s 100°C threshold is specifically a property of their ruggedized displays.

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.

But this leads to another problem: how can moisture be prevented from entering through the vent? If moisture enters the device and high heat is present, condensation can occur, fogging the display from inside, and in some cases, short-circuiting may cause the device to turn off. In order to circumvent this issue, the shapes of the air vents are specific in a way that allows only for air movement, not forms of moisture.

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.

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.

The use of liquid crystal displays (LCDs) in user interface assemblies is widespread across nearly all industries, locations, and operating environments. Over the last 20 years, the cost of LCD displays has significantly dropped, allowing for this technology to be incorporated into many of the everyday devices we rely on.

The odds are high you are reading this blog post on a laptop or tablet, and it’s likely the actual screen uses LCD technology to render the image onto a low-profile pane of glass. Reach into your pocket. Yes, that smartphone likely uses LCD technology for the screen. As you enter your car, does your dashboard come alive with a complex user interface? What about the menu at your favorite local drive-thru restaurant? These are some everyday examples of the widespread use of LCD technology.

But did you know that the U.S. military is using LCD displays to improve the ability of our warfighters to interact with their equipment? In hospitals around the world, lifesaving medical devices are monitored and controlled by an LCD touchscreen interface. Maritime GPS and navigation systems provide real-time location, heading, and speed information to captains while on the high seas. It’s clear that people’s lives depend on these devices operating in a range of environments.

As the use of LCDs continues to expand, and larger screen sizes become even less expensive, one inherent flaw of LCDs remains: LCD pixels behave poorly at low temperatures. For some applications, LCD displays will not operate whatsoever at low temperatures. This is important because for mil-aero applications, outdoor consumer products, automobiles, or anywhere the temperature is below freezing, the LCD crystal’s performance will begin to deteriorate. If the LCD display exhibits poor color viewing, sluggish resolution, or even worse, permanently damaged pixels, this will limit the ability to use LCD technologies in frigid environments. To address this, there are several design measures that can be explored to minimize the impact of low temperatures on LCDs.

Most LCD displays utilize pixels known as TFT (Thin-Film-Transistor) Color Liquid Crystals, which are the backbone to the billions of LCD screens in use today. Since the individual pixels utilize a fluid-like crystal material as the ambient temperature is reduced, this fluid will become more viscous compromising performance. For many LCD displays, temperatures below 0°C represent the point where performance degrades.

Have you tried to use your smartphone while skiing or ice fishing? What about those of you living in the northern latitudes - have you accidently left your phone in your car overnight where the temperatures drop well below freezing? You may have noticed a sluggish screen response, poor contrast with certain colors, or even worse permanent damage to your screen. While this is normal, it’s certainly a nuisance. As a design engineer, the goal is to select an LCD technology that offers the best performance at the desired temperature range. If your LCD display is required to operate at temperatures below freezing, review the manufacturer’s data sheets for both the operating and storage temperature ranges. Listed below are two different off-the-shelf LCD displays, each with different temperature ratings. It should be noted that there are limited options for off-the-shelf displays with resilience to extreme low temperatures.

For many military applications, in order to comply with the various mil standards a product must be rated for -30°C operational temperature and -51°C storage temperature. The question remains: how can you operate an LCD display at -30°C if the product is only rated for -20°C operating temperature? The answer is to use a heat source to raise the display temperature to an acceptable range. If there is an adjacent motor or another device that generates heat, this alone may be enough to warm the display. If not, a dedicated low-profile heater is an excellent option to consider.

Made of an etched layer of steel and enveloped in an electrically insulating material, a flat flexible polyimide heater is an excellent option where space and power are limited. These devices behave as resistive heaters and can operate off a wide range of voltages all the way up to 120V. These heaters can also function with both AC and DC power sources. Their heat output is typically characterized by watts per unit area and must be sized to the product specifications. These heaters can also be affixed with a pressure sensitive adhesive on the rear, allowing them to be “glued” to any surface. The flying leads off the heater can be further customized to support any type of custom interconnect. A full-service manufacturing partner like Epec can help develop a custom solution for any LCD application that requires a custom low-profile heater.

With no thermal mass to dissipate the heat, polyimide heaters can reach temperatures in excess of 100°C in less than a few minutes of operation. Incorporating a heater by itself is not enough to manage the low temperature effects on an LCD display. What if the heater is improperly sized and damages the LCD display? What happens if the heater remains on too long and damages other components in your system? Just like the thermostat in your home, it’s important to incorporate a real-temp temperature sensing feedback loop to control the on/off function of the heater.

The next step is to determine the number of temperature sensors and their approximate location on the display. It’s recommended that a minimum of two temperature sensors be used to control the heater. By using multiple sensors, this provides the circuit redundancy and allows for a weighted average of the temperature measurement to mitigate non-uniform heating. Depending on the temperature sensors location, and the thermal mass of the materials involved, the control loop can be optimized to properly control the on/off function of the heater.

Another important consideration when selecting a temperature sensor is how to mount the individual sensors onto the display. Most LCD displays are designed with a sheet metal backer that serves as an ideal surface to mount the temperature sensors. There are several types of thermally conductive epoxies that provide a robust and cost-effective way to affix the delicate items onto the display. Since there are several types of epoxies to choose from, it’s important to use a compound with the appropriate working life and cure time.

For example, if you are kitting 20 LCD displays and the working life of the thermal epoxy is 8 minutes, you may find yourself struggling to complete the project before the epoxy begins to harden.

Before building any type of prototype LCD heater assembly, it’s important to carefully study the heat transfer of the system. Heat will be generated by the flexible polyimide heater and then will transfer to the LCD display and other parts of the system. Although heat will radiate, convect, and be conducted away from the heater, the primary type of heat transfer will be through conduction. This is important because if your heater is touching a large heat sink (ex. aluminum chassis), this will impact the ability of the heater to warm your LCD display as heat will be drawn toward the heat sink.

Insulating materials, air gaps, or other means can be incorporated in the design to manage the way heat travels throughout your system on the way toward an eventual “steady state” condition. During development, prototypes can be built with numerous temperature sensors to map the heat transfer, allowing for the optimal placement of temperature sensors, an adequately sized heater, and a properly controlled feedback loop.

Before freezing the design (no pun intended) on any project that requires an LCD display to operate at low temperatures, it’s critical to perform low temperature first. This type of testing usually involves a thermal chamber, a way to operate the system, and a means to measure the temperature vs time. Most thermal chambers provide an access port or other means to snake wires into the chamber without compromising performance. This way, power can be supplied to the heater and display, while data can be captured from the temperature sensors.

The first objective of the low-temperature testing is to determine the actual effects of cold exposure on the LCD display itself. Does the LCD display function at cold? Are certain colors more impacted by the cold than others? How sluggish is the screen? Does the LCD display performance improve once the system is returned to ambient conditions? These are all significant and appropriate questions and nearly impossible to answer without actual testing.

As LCD displays continue to be a critical part of our society, their use will become even more widespread. Costs will continue to decrease with larger and larger screens being launched into production every year. This means there will be more applications that require their operation in extreme environments, including the low-temperature regions of the world. By incorporating design measures to mitigate the effects of cold on LCD displays, they can be used virtually anywhere. But this doesn’t come easy. Engineers must understand the design limitations and ways to address the overarching design challenges.

A full-service manufacturing partner like Epec offers a high-value solution to be able to design, develop, and manufacture systems that push the limits of off-the-shelf hardware like LCD displays. This fact helps lower the effective program cost and decreases the time to market for any high-risk development project.

Clearview™ transparent heating elements are an optically clear variation of our wire-wound heater that provides superior light transfer with higher durability than comparable technologies.

The wire-wound design brings high heating efficiency and quick thermal response with minimal power consumption. This makes Clearview LCD screen heaters ideal for applications such as computers, battery powered hand scanners, and touch screens.

Optically clear heaters are typically used in applications that require a high degree of light transmission. Clearview"s ultra-fine wire construction gives high optical clarity and ensures optimal light transmission for scanning and imaging applications.

Clearview provides controlled, direct heat to displays, lenses and clear panels, allowing continuous high definition operation of device monitors in low temperature environments. With an LCD screen heater, displays and touch screens remain usable in cold, high humidity/low dew point environments and locations where ambient temperature can change quickly.

Engineering services and consultation are available on every custom heating element order. Contact a specialist today for details about Clearview optically clear transparent LCD screen heaters.

Need a product customized for your specific application? Our value-added department specializes in custom printing on a variety of products. Our state-of-the-art hot stamping and thermal transfer printing equipment can quickly customize cable ties and heat shrink tubing with logos, serial numbers and much more. We also have high-speed tube-cutting services and repackaging services.

LCDs used in outdoor situations have many concerns to deal with in addition to any that they might normally encounter during indoor use. Initially some concerns are weather related such as moisture in the air or extreme temperatures. Another concern that is often not understood or just not known about at all is sunlight damage.

Liquid crystal displays use organic components that are susceptible to UV (<400 nm) and IR (>750 nm). These bandwidths of radiation have an observable impact on the organic components in LCDs. Extended exposure has been known to cause a color shift and a washed out look to images displayed with the LCD.

In any case it is important to protect your display from the elements, especially if it is going to be exposed to harsh environments not intended by the manufacturer. One way to do this would be to utilize a Hot Mirror with a UV blocker. This will significantly reduce the amount of IR radiation between 750 nm and 1200 nm, as well as the UV radiation below 400 nm. If the LCD is going to be used outdoors for extended periods then an extended hot mirror may be necessary, which extends the bandwidth protection out to 1600 nm and will help reduce some of the longer wavelength IR damage.

Another concern with liquid crystal displays are their susceptibility to overheating due to excess IR radiation. The LCD is intended to operate within a certain range of temperatures according to the manufacturer’s instructions and outdoor use can lead to higher than normal temperatures. The display being exposed to excessive heat can cause the crystal to become isotropic and fail to perform properly. A hot mirror can help alleviate these concerns as well by reducing the amount of infrared radiation that heats the display.

• Perform highly diversified duties to install and maintain electrical apparatus on production machines and any other facility equipment (Screen Print, Punch Press, Steel Rule Die, Automated Machines, Turret, Laser Cutting Machines, etc.).

Sunlight readable LCDs are designed to work in direct sunlight or strong light conditions and are also referred to as daylight visible LCDs or outdoor LCDs. Different techniques can be used to make LCDs readable under conditions of strong light exposure. It does this by increasing the contrast between the object and the background. For human vision, a contrast ratio of 2:1 is the minimum, 5:1 is acceptable and 10:1 is optimal.

This method is achieved by adjusting the LCD backlight brightness and the contrast of light. The following are suggestions for selecting the brightness of TFT LCD in different light environments.

The semi-transmissive TFT LCD display has a built-in rear polarizer of translucent material, which is used for its own illumination by reflecting light from the surrounding part, and the stronger the light, the brighter the TFT LCD.

Since semi-transmissive TFT LCD has both transmittance and reflectance characteristics, it works well in both outdoor and indoor environments. In addition, it is very energy efficient and especially suitable for battery-powered devices.

To further improve the readability of TFT LCD under direct light, anti-reflection and anti-glare can be used for processing, and reflective film can reduce the reflected light into the eyes of the observer.

Optical bonding is the process of filling the air gap between the TFT LCD and the top surface of the display with an optical grade adhesive. Optical bonding reduces the refraction of light (from the LCD backlight and from outside), thereby improving the readability of the TFT display. In addition to the optical benefits, it also serves to improve the durability and touch accuracy of the touch screen and prevents fogging and condensation.

While high brightness LCD displays generate more heat and consume more energy than traditional LCD displays, LED lights to minimize power consumption, our sunlight readable LCD multiple touch screen options, including resistive and capacitive screens. Sunlight readable touch screens are specifically designed for indoor needs and outdoor applications, and are now successfully used in vending kiosks, electric vehicle charging stations, and environmental monitoring.

The phenomenon of screen burning refers to the gradual decay of each pixel on the cell phone screen. Since LCD needs backlight support when displaying, and the light has to pass through two layers of glass and substrate with various optical films, matching films, color filters to produce polarized light, there will inevitably be losses in brightness and color, so the LCD non-self-illuminating display principle leads to its non-burning phenomenon.

Due to the principle of OLED self-luminous, it does not need backlight support, with self-illumination, and has a wide viewing angle, high contrast, low power consumption, high response rate and full color, simple process and other advantages. However, due to its self-luminous causes the consumption of display components, so it will occur burn screen phenomenon.

To achieve the “burn-in” phenomenon is very difficult to achieve. According to the previous test results of foreign testers, the iPhone X to burn the screen phenomenon at least to turn on the screen maximum brightness to display the same picture 510 hours before it will appear. In Apple’s official view, the iPhone X screen burning is not a failure problem but a normal performance, OLED screen burning phenomenon is temporarily unavoidable.

Although the LCD will not burn screen phenomenon, but because of the existence of LCD backlight layer and liquid crystal layer, its thickness is much thicker than OLED, for cell phone products, if you want to do more thin and light, OLED is essential. In addition, LCD is not made to bend state, while OLED screen can be bent at will.

The reason why lcd screen hurts eyes: because LCD screen does not self-luminous, so LCD screen uses blue LED backlight board, which is covered with red filter, green filter and colorless filter, when blue light through the three filters to form RGB three primary colors. But the blue light is not completely absorbed by the filter, will penetrate the screen, forming short-wave blue light, when the human eyes for a long time, close contact will cause damage.

Advanced screen displays require additional components to help them perform more efficiently and last longer. These solutions, in the form of Integrated Display Gaskets, are composed of bonding systems, vibration management, optically clear adhesives (OCA), window tapes, barrier films and thermal management.

Electronic display modules rely on the performance of every component within the screen assembly, including gaskets and cushions, which help protect against dust, moisture, shock, and vibration. Stable, innovative materials that hold ultra-tight tolerances are better able to seal against environmental and contaminant factors. This makes raw material selection the foundation of the longevity of the display module and thus the lifetime of the final product.

Display modules require high optical clarity for functionality accuracy, and customer satisfaction of the final product, which can be compromised by Foreign Object Debris (FOD) during manufacturing. Optically clear adhesives are critical to ultimate screen clarity, contrast, and minimized reflection. OCAs, a critical component to LED/OLED seals, are one of the most challenging materials to cut and handle as they are highly sensitive to FOD.