The trend for LED backlights in TFT displays are increasing at a rapid pace. More and more suppliers are offering new LCD sizes and formats on a regular basis.

NEC is introducing 5 new TFT’s incorporating a newly designed LED units that achieve both long operating life of 70,000 hours and low power consumption in the backlight system.

The main characteristics of the new modules are as follows:

1. Long-Life and Low-Power White LED Unit
The newly designed white LED unit, outperforms conventional cold-cathode fluorescent lamps (CCFL) with an operating life of 70,000 hours at room temperature (25 degrees Celsius). It reaches an operating life of 60,000 hours at a high temperature of 60 degrees Celsius, and boasts high reliability that is ideal for display devices in industrial equipment exposed to severe environmental conditions. All new modules reduce power consumption by more than 20 percent compared to conventional CCFL backlight systems.

2. Compatibility
Each of the new modules is compatible with NEC LCD Technologies’ conventional standard products of the same size in relation to outer dimensions, position of mounting holes, and screen center. Each also maintains signal compatibility with conventional products. Thus, the modules can be replaced easily without the need to change any of their peripheral appliances.

3. Wide operating temperature range
A wide operating temperature range, from –20 to +70 degrees Celsius, guarantees operation even in extreme conditions. Moreover, the luminance of the white LED backlight performs exceptionally well under low temperatures, even from initial startup.

Material referenced above can be found on NEC’s web site:

http://www.necelam.com/news/newsdetail.html?page=long_life_low-power_white_led_for_industrial_display#1

Posted by: John Clauson, Feb 16, 2009

MTF-TW70SN731-LB (aka UMSH-8013MD-1T)

• 7.0” Digital TFT available with and without Touch Screen
• Outline dimensions are 164.0(W) x 104.0(H) x 6 (D)mm
• 16×9 Aspect Ratio
• -30°C to + 80°C operating temp
• Resolution is 800 x RGB x 480 dots.
• LVDS interface and built-in voltage board (V-Com, T-Con, DC/DC)
• LED backlight is 500 Nits

Pros: high noise immunity and low noise generation, good for long distanced between LCD and controller, quicker data transfer over fewer data lines, generally lower power consumption

Cons: two wires required for each data transmission

Applications: automotive, industrial, military

Specification: mtf-tw70sp731-lb-_20071221_

Posted by: John Clauson

Original Post by John Clauson, Jan. 8, 2009

The trend for LED backlights in TFT displays are increasing at a rapid pace. More and more suppliers are offering new LCD sizes and formats on a regular basis.

NEC is introducing 5 new TFT’s incorporating a newly designed LED units that achieve both long operating life of 70,000 hours and low power consumption in the backlight system.

2. Compatibility
Each of the new modules is compatible with NEC LCD Technologies’ conventional standard products of the same size in relation to outer dimensions, position of mounting holes, and screen center. Each also maintains signal compatibility with conventional products. Thus, the modules can be replaced easily without the need to change any of their peripheral appliances.

3. Wide operating temperature range
A wide operating temperature range, from –20 to +70 degrees Celsius, guarantees operation even in extreme conditions. Moreover, the luminance of the white LED backlight performs exceptionally well under low temperatures, even from initial startup.

Material referenced above can be found on NEC’s web site:

http://www.necelam.com/news/newsdetail.html?page=long_life_low-power_white_led_for_industrial_display#1

The main characteristics of the new modules are as follows:

1. Long-Life and Low-Power White LED Unit
The newly designed white LED unit, outperforms conventional cold-cathode fluorescent lamps (CCFL) with an operating life of 70,000 hours at room temperature (25 degrees Celsius). It reaches an operating life of 60,000 hours at a high temperature of 60 degrees Celsius, and boasts high reliability that is ideal for display devices in industrial equipment exposed to severe environmental conditions. All new modules reduce power consumption by more than 20 percent compared to conventional CCFL backlight systems.

Toshiba America has released five new Industrial TFT modules that incorporate an LED Backlight with a 70,000 Hour MTBF; or, in simple terms, approximately 8 years of continuous operation (to half brightness of the initial luminance specifications).  This spec equals and exceeds what is common with traditional CCFL backlight products.  The Benefits of the LED backlights are lighter weight, lower electrical noise, low power consumption, instant “on” and better performance in cold temperatures, better shock & vibe, and a wider adjustable luminance range.  These panels are also designed with a replaceable backlight structure and Toshiba has added the LED driver circuitry to the electrical interface which simplifies design and sourcing concerns. These panels are ideal for a myriad on industrial applications:

For additional information, please email ask.LCD@avnet.com. Specs for these modules are also available below:

http://www.toshiba.com/taec/components/Datasheet/LCD/LTA057A343F.pdf

http://www.toshiba.com/taec/components/Datasheet/LCD/LTA065B0D2F.pdf

http://www.toshiba.com/taec/components/Datasheet/LCD/LTA084C271F.pdf

http://www.toshiba.com/taec/components/Datasheet/LCD/LT084AC37000.pdf

http://www.toshiba.com/taec/components/Datasheet/LCD/LT104AC36100.pdf

Overview

As more and more LCDs find their way into outdoor applications, the need becomes far greater for them to not only be able to withstand severe temperature extremes (heat and cold) and solar radiation, but the LCD must also be readable when exposed to extreme optical conditions such as direct and indirect sunlight, glare and reflection. On an average sunny day, the illumination of ambient daylight is approximately 30,000 nits. Therefore, a TFT’s brightness should be over 900 nits to get a clear image for an outdoor application.

Most off-the-shelf LCDs are not properly equipped to handle all of these requirements. There are  several brightness enhancement solutions to meet/exceed our customers’ requirements.

Benefits of Brightness Enhancements for TFT Modules

• Increase brightness up to 100% with enhancement films alone
• Improve display contrast and readability
• Improve display clarity and image quality
• Superior uniformity
• Improved operating temperature range and brightness

Options

Both passive and active backlight modifications can dramatically improve sunlight readability. One of the most efficient and cost-effective solutions is the GenFlective™ display, a hybrid of transflective and passive enhancements. Avnet also offers a standard transflective display, which incorporates a highly reflective polarizer that reflects ambient light back out of the display. Thirdly, Avnet provides the traditional value-add backlight solution, an active enhancement featuring your choice of CCFL, LED or NVIS backlight technology.

Passive Enhancements

Benefits of GenFlective™ Technology

• Requires no more power than OEM panel
• Dissipates no more heat than OEM panel
• Simplifies integration of value-add display
• Easier to address cooling due to low power
• Can often be combined with other passive enhancements (optical bonding) or active enhancements (sunlight/daylight readable backlights/edgelights)
• Typical enhancement of OEM luminance of 20% to 100%

A GenFlective™-enhanced LCD is a display that has been altered, using passive enhancements, to improve the brightness (transmissive and/or reflective) and/or the contrast of the display. Although each display has its own personality, due to differences in design, manufacturing techniques and in the stock film stack, our value-add partner can typically enhance the performance of an OEM panel utilizing Optical Management Films, Polarizers and Diffusers, and a multitude of films and coatings (Contrast Enhancement, Index Matched, Antireflective, etc.)The display would be characterized under darkroom conditions and three different simulated daylight conditions. We would then do an evaluation of the OEM films in the LCD and modify this configuration as we deem reasonable. We will do up to four iterations of backlight film modifications and submit the data to you, along with our analysis of what the data tells us. 

Transflective Panels

Although they are designed to reflect ambient light back out the display to augment its performance in direct sunlight, transflective panels have insufficient transmissive luminance (typically ~200 nits) to be considered usable in diffused lighting conditions where direct sunlight is not available (e.g., cloudy or rainy days).