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Displays for transportation applications

Research shows that the most important criteria for people, who choose public transportation, are the quality of the provided service, the comfort of travel, as well as the timeliness, and legibility of information about it.  To ensure the passengers’ satisfaction LCD modules, which are used in transport information systems, should be adapted to long-lasting, continuous operation and displaying dynamic content. Modern transport systems are able to meet these expectations.

Dedicated aspect ratio and features

To get the most of even untypically sized surfaces, display manufacturers have developed the TFT glass cutting technology, which allows you to get shapes from square to a longitudinal rectangle with non-standard proportions.

LCD modules used in transport systems have been designed to meet the requirements of a diverse range of difficult environments. In the case of Litemax products, the average time between failures (MTBF) is about 100,000 hours, which makes them ideal for applications requiring a round-the-clock operation, and thanks to an optimized backlight system characterized by the reduced level of electromagnetic disturbances and lower energy consumption.

The most important features for LCD monitors used outdoors is the readability of the information also in direct sunlight. High brightness (from 1000 to 2500 cd), wide viewing angles and high contrast are essential. Below table presents selected models which can be used in transport applications.

Selected BAR TFT displays (stretched)

 

Size

Vendor

PN

Resolution

Active Area [mm]

Brightness

Contrast

OT [st.C]

 

37.6

Litemax

SSF3805-I

1920x540

919.296x258.5

1000

8000*1

0+50

 

47.8

Litemax

SSF47888-B

1920x178

1209.6x275.5

1600

1700*1

0+50

 

29

Innolux

S290AJ1

1920x540

698.4x196.425

1000

4500*1

0+50

 

29

AUO

P290IAN01.0

1920x540

698.4x196.42

700

1500*1

0+50

 

37

AUO

P370IVN02.0

1920x540

904.32x254.34

700

4000*1

0+50

 

42

AUO

P42OIVN02.0

1920x480

1039.68x259.92

1500

4000*1

0+50

 

48.5

AUO

P485IVN01.0

1920x360

1209.6x226.8

700

4000*1

0+50

 

48

BOE

DV480FBM-N01

3840x720

1194.04x223.88

1000

1000*1

0+50

 

Selected displays for outdoor applications

Size

Vendor

PN

Resolution

Active Area [mm]

Brightness

Contrast

OT [st.C]

Hi-Tni

32

Litemax

DLH3200-G

1920x1080

698.4x392.85

2500

1100*1

0+50

YES

43

Litemax

DLH4300-L

1920x1080

941.1x529.4

2500

1500*1

0+50

YES

55

Litemax

DLH-5500-L

1920x1080

1209.6x680.4

2500

1000*1

0+50

YES

32

AUO

P320HVN04.1

1920x1080

698.4x392.85

1500

4000*1

0+50

YES

43

AUO

P430HVN05.0

1920x1080

940.89x529.25

1500

4000*1

0+50

YES

46

AUO

P460HVN04.3

1920x1080

1018.08x572.67

1500

4000*1

0+50

YES

55

AUO

P550HVN06.4

1920x1080

1209.6x680.4

2500

4000*1

0+50

YES

65

AUO

P650HVN05.1

1920x1080

1428.48x803.52

2500

4000*1

0+50

YES

85

AUO

P850QVN01.1

3840x2160

1872×1053

2500

5000*1

0+50

YES

Great endurance

The operating temperature range for this type of products is on average 0 - 50°C, however, TFT glass resistance can be as high as -40 to 110°C (Hi-Tni), which makes it possible to use it in places with high insolation without the risk of black stains on the matrix.

Manufacturers also provide resistance to other harsh environmental conditions. In monitor solutions, the standard sealing between the glass protecting the display and the housing allows obtaining resistance at IP65 level (dust and water jets). There are also products with increased resistance - up to IP68, which is completely resistant to dust and adapted to stay underwater (for a limited time, depending on the model, about 30-60 minutes).

Even better readability

To further enhance the reception of the displayed information manufacturers use technologies that improve color reproduction and area brightness adjustment. This feature is responsible for local dimming of the image, which maximizes the contrast between the dark and light areas of the screen significantly improving the depth of black.

In addition, manufacturers offer optical bonding services. This technology allows you to combine the display with special coatings, i.e. AG (anti-glare), AR (anti-reflex) or polarizing filters. Due to the high popularity of polarized glasses, outdoor display manufacturers are increasingly opting to use a special polarizer design, so that the displayed content will be readable also for people using this type of lenses.

E-paper – an alternative for LCD displays

In the case of applications displaying static information, an interesting alternative may be the use of e-paper displays. Their unquestionable advantage is exceptional readability in direct sunlight, almost full viewing angles and very low power consumption. Comparing LCD and e-paper displays of similar sizes (LCD: 32`` Hyundai IBT, H325SSI-outdoor, EPD: 31.2`` E Ink, ED312TT2) assuming working time 16h per day, you can see that LCD display consumes more than 111 times more energy than EPD (assuming image update every 1h and its duration - 1s) - you can find the results in below table.

 

Power consumption

Total energy consumption for the 1 day cycle

Total energy consumption for the 1 year cycle

LCD

145W

2,3 kWh

846,8 kWh

EPD

23,7W (for the content update)

1,3W (image maintenance)

0,02 kWh

7,6 kWh

 

A problem with EPD displays may be their low thickness and susceptibility to damage, which makes installation in end devices difficult. The solution to this problem was the open frame modules created by Unisystem. They provide not only mechanical safety and protection against degradation of e-paper (thanks to a laminated UV filter) but also thanks to the use of front glass, a modern and elegant look. Open frames offer also dedicated controllers enabling communication using one of four interfaces (SPI, USB, Wi-Fi, GSM).

 

Do not hesitate to contact us for further information.

 

 

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