Category Archives: Sunlight Readable Transflective Displays

Articles discussing tr.ansflective LCD panels, sunlight readable technology and high brightness monitors

Industrial LCD monitors usage in varied environmental conditions

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Industrial LCD Display

The prices of LCD panels have been on a steady decline all over the world. This may not be exciting news for the manufacturers,but buyers are only too happy to make the most of the situation. If you are planning to utilize long-life Industrial LCD Display Panels in your device, the market’s currently low pricing of LCD panels make this a great time to make the purchase.

LCD screens are very much in the modern workplace. They typically are embedded with an Open Frame LCD display, and finally assembled into an LCD monitor. In fact, it is now very rare to find a computer without one of these displays, although the cathode ray tube (CRT) monitors are still widely used in older systems on boats, hospital equipment and control rooms.

LCD displays have several important advantages over CRT monitors in that they take up far less space, they power-up almost instantaneously, and they use around 70% less power than a similar sized CRT monitor.LCD monitors are in fact so prevalent in the market place that almost every new computer purchased comes with a monitor that has an embedded LCD screen.

There are several reasons for the increased popularity of LCD displays:

Firstly, most computer monitors that are purchased are designed for use at home or in an office environment.

The LCD monitors are designed to sit in the same place for years, and not be moved.

They are designed for normal environmental conditions. They are not designed to be used in environments that are extremely hot, cold, damp or dusty. Such environments are ideal for a more rugged open frame LCD display solution.

These consumer-grade LCD displays are not designed to be particularly scratch resistant. Also they are not designed to withstand 24/7 constant operation or environments where there are vibrations.

If your LCD display’s environment falls outside of these categories then an industrial LCD monitor would be an ideal display solution.Industrial LCD displays are designed to withstand far more stringent environments. For industrial LCD displays that are suited for sunlight readability, harsh environments, vibrations or long-life operation, please contact Revosys with your requirements.

Industrial LCD screens are commonly used in the oil industry, in hot climates and in very cold climates, often well below freezing conditions such as used by the military.The industrial LCD displays can be used in harsh environments such as areas where large amounts of dust may be present that could potentially affect the electronics of a regular LCD display.Industrial monitors are designed to work in any environment as described above.

Industrial monitors are also designed to be shock and often scratch resistant. They come in different models that can be bolted down, making them ideal for use in marine display applications. These LCD displays are robust and designed to be moved and deployed in various locations frequently if needed.

If you are looking for an LCD display solution that is being deployed in a harsh environment, please contact Revosys for suggestion on finding your ideal industrial LCD monitor.

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Sunlight Readable LCD and High Brightness LCDs

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Sunlight Readable Monitorsor High Brightness LCDs are displays that can be comfortably viewed in the outdoors and even indirect sunlight. To be considered truly direct Sunlight readable, such LCD displays typically musthave a brightness of at least 1000 nits and a contrast ratio of 5:1 or higher.Although some 500 nit (2:1 contrast ratios) displays are somewhat visible in the daylight, they cannot be referred to as transflective LCDs or sunlight readable. High Brightness LCDs are especially vivid in outdoor shades.

A nit (in terms of brightness) is a measure of luminance used to judge the working effectiveness of sunlight readable displays or open frame high brightness LCDs. A nit means the amount of candelas /m2 that the backlight is giving off.Scientifically speaking, the human mind is drawn more to an object that has a higher luminance. While a 250 nits LCD might look good indoors,Sunlight Readable LCDsor High Brightness LCDs must have a luminance of around 1000 nits to be effectively seen in the outdoors.

A Sunlight Readable LCD or  does not only have to be very bright at its highest brightness and contrast ratio, it must allow for a wider brightness range. The brightness range in a normal LCD is around 10% to 100%, but most Sunlight Readable LCDsor High Brightness LCDs come with a 0.5% to 100% brightness range to allow healthy indoor and outdoor viewing.

The contrast ratio of the LCD tells us of the difference in the brightness between the blackest and the whitest elements of a LCD Display pixel, thusa Sunlight Readable LCD or High Brightness LCD must have a sharp contrast ratio to counteract the bright sunlight. Whilst a normal indoor LCD has a 300:1 contrast ratio in a dim room, this falls down to 2:1 when the LCD Display is taken outdoors. On the other hand, a Sunlight Readable LCD or a Transflective LCD display will have a contrast ratio of 8:1 when taken outdoors in direct sunlight.

Some Sunlight Readable LCD or High Brightness LCDsdo carry the risk of having an inadequate viewing angle. A viewing angle is the angle at which the image quality of a display deteriorates to the point that it stops fulfilling its intended purpose. This is because of a drop in luminance, contrast ratio and the shift in colors. Revosys’s Sunlight Readable LCD, High Brightness LCD and Transflective Displays do not carry this viewing angle risk because of their superior technology and proven field tests.

A Sunlight Readable LCD or High Brightness LCD commonly requiresa CCFL (cold cathode fluorescent lamps) that in turn require inverters. An inverter is a device that converts DC voltage into AC voltage. All of this heat dissipation coupled with the heat of the sun, may require a more robust thermal management system.

Please contact Revosys today to discuss your Sunlight Readable LCD, Transflective Displayand High Brightness Monitorrequirements and the related thermal management systems available.

Sunlight Readable LCD Displays – The Science and Applications

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Sunlight Readable LCD displays are LCD panels that provide a bright display even in direct sunlight(even that of the 100k lumens range). This is a great convenience for devices that have to function outdoors in bright daylight, such as marine displays, boat displays, military displays, and PID Public Information Displays. Such LCD panels employ the Transflective LCD display technology.Working without the need of a backlight as found in traditional LCDs, Transflective LCD displays offer a wide range of potential applications, for industrial, personal and military needs, while consuming low power.

Transflective LCD displays are those displays that transmit and reflect ambient light. When such a display is exposed to sun or any other source of light, the display starts acting as a reflector, with its contrast ratio adjusting in direct proportion with the luminance of the light. The display carries a split pixel design which allows it to shift to and from the reflective mode. Such a display works equally well in dark and dim ambience, and might rarely require a supportive transflective backlight (which is already a part of the LCD design) or an LED backlight. Transflective LCDs can naturally, without any additional electronics, understand their environment and respond with the necessary brightness adjustment. This is one of the reasons why this technology is very popular in marine displays, boat displays, military displays, and PID (Public Information Displays). The transflective mode also helps save battery in portable devices since no additional light is required in outdoor conditions. The battery power saving can be as much as 60% and sometimes more. This is a great convenience for manufacturers who need displays for their portable products. Even some cellphones now come equipped with a transflective LCD display.

The most essential element of one such LCD is the transflector (Transmission + Reflection), which is made up of a polymer sheet and is capable of reflecting and transmitting at the same time (transmissive and reflective modes). The LCD works well with and without a backlight depending on the environmental factors (ambient light conditions). The shift to and from a backlight is automatic and seamless.

Traditional TFT LCD displays are partially reflective and hence only suitable for viewing in lower light conditions. With higher ambient light, these LCD displays may require placement at a certain angle. Such LCDs usually end up having their images completely “washed out” when exposed to the bright sunlight and the LCD may even get damaged physically. This makes the use of such LCDs in portable devices such as emergency vehicle displays or outdoor signage an utter inconvenience and a near impossibility or when employed as a marine/boat display, or military display.

Given Revosys’s already advanced capabilities of supplying a wide-range of LCD displays, this technology is a major addition to its range of products. Please feel free to send us an inquiry outlining your needs today. We are more than happy working with our valued customers and providing them with intelligent and custom LCD display solutions.