low temperature lcd display in stock

{"specs":[],"skus":[{"id":4095,"useViewType":false,"productId":307,"templateId":1,"code":"","name":"6 digit low temperature LCD screen,GDC0689","stock":0,"price":0.00,"retailPrice":0.00,"weight":0.00,"status":"1","isDefault":"1","createDate":"2021-09-28 14:36:28","updateDate":"2021-09-28 14:36:28","productSkuSpecs":[],"moq":1,"skuId":0,"chargedWeight":0.00}],"specConfs":[]}

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.

While directly current flows in ITO"s resistance, it will turn electrical energy into heat. The smaller resistance is (the higher consumption power is), the more heat it can generate. The concept is similar to Traveling immersion coil. When we plug in Traveling immersion coil, the current will flow in metal and generate heat to boil water.

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.

Previously LCDs that operated in extreme cold or extreme heat required bulky built-in heaters and coolers in order to ensure performance. However, the proprietary liquid crystal used in the InfoVue Extreme Temp series eliminates the need for coolers and allowing Lumex to use low-power heaters. This makes the InfoVue Extreme Temp LCDs better able to perform in more hostile conditions.

InfoVue Extreme Temp LCD displays provide reliable, consistent high-quality performance from -40°C to +85°C , making Lumex LCD technology a viable solution for a growing number of applications. The growing demand for high performance LCD technology can be seen in military, freezer, gas pumps/fuel meters, non-automotive transportation, and nonclimate controlled facility applications.

Extreme Temp LCDs also offer significant visual performance benefits, providing full graphic capability and daylight visibility. When combined with LED backlighting technology, a wide range of color options are available. All InfoVue Extreme Temp LCDs are available with either a monochromatic screen with any color of LED backlight, or select negative image option with mono colored pixels and a black background.

InfoVue Extreme Temp LCD displays can be produced in sizes ranging from 8 x 1 to 20 x 4 character displays and 128 x 64 to 320 x 240 pixel graphic 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 first step is to select temperature sensors that can be affixed to the display while being small enough to fit within a restricted envelope. Thermistors, thermocouples, or RTDs are all options to consider since they represent relatively low-cost and high-reliability ways to measure the display’s surface temperature. These types of sensors also provide an electrical output that can be calibrated for the desired temperature range.

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.

Whether by special request or recognizing a need that hasn"t been satisfied, General Digital creates many uniquely innovative LCD monitors, smart displays and keyboards, among other highly specialized HMI products. By working closely with our customers, we can specially design a component to perfectly satisfy your requirements. Below is a sampling of the interesting display systems and keyboards we"ve produced in recent years.

General Digital designed a custom version of our Barracuda environmentally-sealed monitor to meet customer-supplied specifications for fit, form and function. The display system is used as a fire control system (digital sight) for a portable rocket grenade launcher in combat situations. Design of this complex solution required General Digital’s mechanical, electrical, optical and software engineering expertise and integration skill sets. Watch the video of the L40-2 Grenade Launcher in action on the Department of Defence Australia YouTube channel.

Micromesh EMI filter blocks incoming and outgoing RF radiation to comply with MIL-STD-461 (Army Ground), while allowing more light output as compared to ITO overlays

As an advanced avionic monitor, it is equipped with multiple optional specialized features, such as an optically bonded LCD with EMI mesh and heater, panel mount adaptor, military-grade connectors, On/Off toggle switch with finger guard, and more.

Designed to meet specific requirements and specifications for a flight simulator application, General Digital’s new 21.5" ruggedized LCD monitor boasts a 1920 x 1080 full high definition resolution, and a sunlight readable LED night vision goggle-compatible backlight. This second generation LED/NVIS backlight provides more brightness, better uniformity and less power than the original backlight, which was designed for maritime applications. Configurations include an LED/NVIS display head assembly (with optional backlight driver board), and a standalone/mountable ruggedized enclosure, as pictured here.

Modern LCD screens have a great many uses. Not only are they now the system of choice for our home TVs and computers but their use in digital signage has made them a common sight in many shopping malls, airports and other locations with high quantities of people.

Even outdoor locations are no barrier to the use of modern LCD screens with outdoor digital signage a rising medium now seen in many town centers, car parks, front of stores and train station platforms.

All this out of home use means many screens operate in locations test the temperature limits of LCD displays. While waterproof screens and LCD enclosures designed for rugged applications provide the ability of the screen to operate-even in outdoor locations, one consideration often overlooked, is that of temperature.

LCD screens have a limited temperature range. Not only will the electronics inside an TV screen overheat and cause failure if the screen gets too hot, but the liquid crystal itself will begin to deteriorate under hot conditions.

The same is true of environments where temperatures fall below zero, causing a screen to stop functioning. A typical LCD TV has an operating range between 0°C (32°F) and 32°C (90°F).

Of course, many indoor and outdoor locations don’t suffer temperatures outside of this range, but many locations do and placing screens in these areas can prove challenging.

One of the problems with using a screen in hot locations is that the screen itself produces quite a bit of heat. When housed in an outdoor enclosure, the heat has to be continuously removed. While cooling fans combined with an air-vent normally carry out this task on an LCD, the need to prevent moisture from getting to the screen makes the task more complicated.

To get around this problem, specially shaped vents provide an exit for hot air while preventing rainfall and other moisture from getting in. In some locations where ambient temperatures are extremely high, screens need air conditioning to ensure they don’t exceed the maximum operating temperature.

In cold climates the opposite problem occurs. The need to keep heat in often requires insulation of the screen enclosure. Often this can trap enough of the heat generated by the screen itself to keep the internal temperature above minimum, but in some locations, even this isn’t enough. Heaters, controlled by thermostats provide extra heat in these circumstances, which enables the use of LCD displays in extremely cold locations such as ski-resorts and in Arctic regions.

Intempco Sanitary DTG Series battery powered LCD Digital Temperature Gauge, is a step above all competition, providing accurate and reliable electronic temperature indication. Because of the robust IP67 housing all stainless design, they offer protection against moisture and dust penetration. The DTG can be used as a direct replacement for Bi-Metal, Liquid Bulb and Glass Thermometers where no power is available.

All models are factory calibrated for maximum accuracy. The DTG’s 4-digit 1/2” (12.7 mm) LCD display can be factory set in units of ºC or ºF. With resolution to a tenth of a degree, the DTG takes the guesswork out of reading dials and mercury columns. Models with the programming option can be re-calibrated by performing a one-point or two-point calibration using known temperature standards with Intempco’s DTG programming kit . This is where the DTG leaves the competition behind. Calibration, display resolution and other features are all programmable. Powered by two high performance 3.6V “AA” batteries, this thermometer will provide a minimum of five years continous operation before batteries require replacement.

DTGs may be ordered as panel mounting with either three-hole front flange or back flange, or as direct mounting thermometer with rigid stem The rigid probe is either of 1/4” or 3/8” diameter as standard but other diameters and materials are available. Probes with flexible extensions are also available. The DTG wetted parts are all fabricated from stainless steel 316L. The RTD element used is Pt-1000 standard accuracy to DIN IEC 60751 Class A. DTG can be made available with an additional RTD output. This feature allows a single process connection to be used for indication of temperature and for remote indication, recording, or controlling. The electrical connector, a flexible cable or a Micro-DC male plug, are made available from the stainless housing for the optional RTD output. Each DTG has the part number, range and serial number marked on the thermometer housing.

Just chipping in my two cents. The instructions of the LG 25UM65 LED model states that "the monitor may flicker in an area where the temperature is low. This is normal."

In my experience "Low temperature" means below 17 °C in room temperature. These models also turn of the screen if flickering occurs, so you will only see flickering shortly before a black screen. Image may or may not reappear, without turning monitor off and on again. As the temperature rises both in the room and the monitor, the problem gradually goes away.

I took few more from my order and they work as expected. I had a problem with one more, however after turn off and on again it shown temperature. Anyway the first one is still off, switching on/off, reflash or battery replace didnt help.

I have flashed my 14 sensors and all are experience that same issue. After several minutes screen freeze and doesn"t display current temperature correctly. Power cycle fixing the issue but just for a another several minutes. I haven"t have this problem on the stock firmware.

Reporting back that the thermometer that was working fine for days now, blanked after 30min of being in the fridge. I suspect it has to do with low temperatures. Will try another thermometer.

Reporting back that the thermometer that was working fine for days now, blanked after 30min of being in the fridge. I suspect it has to do with low temperatures. Will try another thermometer.

@bbbenji ok the not showing of data on the lcd when in freezer is also same for me. Havent tested that with stock firmware but i think that is display related. If i press on the lcd when in freezer it comes back while pressing it.

Also, letting it come up to room temperature does not help, only reinserting the battery does, and it can"t be too fast. Seems the caps need to discharge first.

@atc1441 But why is the LCD working on boot and then stops? I can see the boot screening showing "Atc" along with the last 2 chars of the mac and it then stops. Isn"t the boot screen controlled by the same code?

one of my parts has the identical LCD controller version as the thermometer I sent you. Here the error only occurs every few days. Can it possibly only be a question of timing problems with the connection between the LCD controller and MCU (component variation)?

As the firmware is the same for all versions and the mcu does not know what lcd controller is connected it can not behaiv different on other lcd controllers

i could imagine that the humidity went down because while flashing the SOC is on the hole time an drains the battery but only while flashing so now the battery is a bit lower than usual, and maybe also because the thermometer was touched, dont know if it was just done OTA

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.

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.