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Maßnahmen zur Verbesserung der EMV-Eigenschaften von LCD-Modulen

Maßnahmen zur Verbesserung der EMV-Eigenschaften von LCD-Modulen

 

Die Störanfälligkeit von LCD-Modulen ist regelmäßig ein wichtiger Punkt im Design von Produkten. Viele unserer Kunden stellen sicherheitsrelevante Geräte her, bei denen die einwandfreie Funktion der Anzeigeelemente unerlässlich ist.

Wir nutzen daher verschiedene Möglichkeiten um unsere Displays vor Störungen zu schützen. Einige Beispiele führen wir im Folgenden auf. Je nach Produkt können weitere Mittel zum Einsatz kommen. Gerne beraten wir Sie hierzu im Detail und erarbeiten eine kundenspezifische Lösung.

1. COG- oder TCP-Modul mit Anschluss per FPC: Verwendung eines geschirmten FPCs

2. Anschluß von TFTs mit hoher Datenrate: Wechsel von TTL RGB auf ein differenzielles Signal wie LVDS, HDMI, MIPI

3. Verwendung einer Ringelektrode, auch als ESD-Schutzmaßnahme im (COG/TCP-) Display 

4. Displays mit (SPI- oder) I2C-Schnittstelle: Softwareseitige Anpassungen, Nutzung unserer für diese Zwecke angepassten Schnittstelle

5. Software: Anpassungen in der Initialisierung können helfen EMV-Einflüsse zu mindern

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Runde Wearable TFTs

Inzwischen sind mehr und mehr runde TFTs auf dem Markt verfügbar. Viele davon mit hohen Mindestbestellmengen und besonders geeignet für Wearable Produkte.

Im Folgenden eine Auswahl der aktuell verfügbaren Modelle. Alle TFTs natürlich auch mit kapazititvem Touch und individuellem Frontglas verfügbar.

Bitte kontaktieren Sie uns bei konkretem Interesse. Gerne stellen wir Ihnen weitere Informationen zur Verfügung. 

1.3" TFT

1.8" TFT

2.1" TFT

2.47" TFT

3.4" TFT

 

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Low power color TFT displays

Often an important constraint for industrial application is power consumption.

Passive monochrome LCDs will usually use less power, than TFT displays. Hence many customers looking for suitable displays for industrial application had to use traditional monochrome LCDs if they wanted to add a display to their application. 

With the new generation of low power TFT displays, this could change. Low power applications will become colorful. 

Following is an example of a transflective TFT display which can be used both with and without backlight illumination. The powering off of the backlight will save further power and can also be useful in sunlight environments, where enough light is available. 

Traditional TFT displays are transmissive, they can only be read with the help of a backlight. Transflective displays combine the advantages of transmissive displays (they can be read in the dark with the help of a backlight), with the advantages of reflective displays (they can be read without backlight). 

 

Current consumption values

(with 1.8 V supply voltage)

200 micro A in hyper mode

19-50 micro A in low power mode

 

Technical Specification

Parameter Value
Size  1.28"
Resolution 176 * 176
Color Depth 64 Colors
Interface SPI
Technology Type a-Si TFT
Sub Pixelsize 0.1308*0.1308 mm
Display Mode Half the semi-premeable
Viewing Direction ALL
LCM (W * H * D) 26.62*29.72*1.45 MM
Active Area (W * H) 23.02*23.02 MM
Operating Voltage 1.8 – 3.6 v
Operating Temp -20°C ~ 70°C
Driver IC ST7301
   

 

With backlight:

Without backlight:

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Bar type TFT for electronic shelf labeling

Electronic shelf labeling has been a typical e-paper topic. While it is power saving and simple to equip existing shelfs with it, it is also limited in color and and variety of pictures. Videos are not possible.

A new TFT, made to fit typical shelf fronts, could be the alternative:

Display size

23,2"

Resolution

1280*92

Technologie

IPS

Interface

LVDS

Brightness

500 cd/m²

Active Area

588,48*42,297

Viewing Direction

70/60/80/80

Operating Tepmerature

0 - +50°C

Storage Temperature

-20 - +60°C

 

 

 

 

 

 

 

 

 

 

 

Further bar type TFTs are availalbe:

Size (Inch) Width Height
1,8 240 76
2,96 320 124
3,83 480 107
4,58 800 320
6,5 800 320
9,36 1024 400
8,8 480 1920
10,4 1024 100
19 1920 360
23,2 1280 92
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Why MIPI is not suitable for industrial displays

Why MIPI is not suitable for industrial displays

One of the most important requirements for industrial customers is long term availability. This is why it is more than surprising that MIPI displays are offered for industrial purpose. Read here why MIPI is not the preferred solution for industrial TFTs.

What is a MIPI display?

A so called MIPI TFT display is a display with a MIPI-DSI interface which is specified by the MIPI Alliance. The members of this alliance develop interfaces exclusively for the mobile communications industry. The main objectives of the MIPI-DSI interface are: high performance, low power consumption and low electromagnetic interference while reducing pin count and maintaining compatibility across different vendors. Every smartphone display is based on this interface.

A further benefit of these displays is that they are only produced in mass production and therefore the prices are very low. But that also means that all MIPI-Displays which are available on the market are currently produced for smartphone application only. On this fast consumer market every year new smartphones with new displays are developed and because of the high quantities (e.g. Samsung Galaxy S7: >55mil. pcs.) the tooling costs doesn’t matter.

That means that the product lifecycle is very short and the long-term availability doesn’t exist. Nobody will care about an additional customer with an annual demand of 10k pieces. And that is why a product change notification in due time doesn’t exists either.

 

MIPI-DSI protocol

Another big challenge is the MIPI-DSI protocol. Besides a data protocol for the image data there is a SPI interface for configuration. Every display has a different command set. That’s why it is not possible to switch the display. If the customer wants to use a different display, the programming has to start from zero. As nobody cares about small customers (

 

What is the Solution?

  • The use of standard technologies (TFT-LCD) with standard sizes and standard resolutions
  • The application of well documented interfaces, standard for 15 years: digital RGB (TTL)
  • Standardized pinout of the FPC connector e.g. the family-TFT interface of LCD-Mikroelektronik

We look forward to providing you with more information on long-term availability. We would be pleased to prepare an individual offer for you.

 

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Contact

LCD Mikroelektronik GmbH
Otto-Lilienthal-Str. 13
76275 Karlsruhe

Germany

Telefon: +49(0)7243-76888-0
Telefax: +49(0)7243-76888-29

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