Image Credit: Autonics USA, Inc.   Light emitting diodes (LED) are PN junction devices that give off light radiation when biased in the forward direction. Most light emitting diodes function in the near infrared and visible ranges, though there are now UV LEDs.   Configuration   Digital LED displays can have a common anode or common cathode configuration.  In a...
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Q & A on Digital LED Displays

We asked our users for their input on Digital LED Displays. Here are the results of 73 users familiar with Digital LED Displays.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice |

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing digital LED display design?
11 answers
Answers:
Low cost MCUs and I/O expanders make 5x7 matrix display systems more affordable than when they were introduced in the 1970s. Having wider range of colors (for all display types) is a great thing.
~Stephen S, Engineering Consultant, Hamilton, MA
The technology of LED chip, its brightness will influence the design and usage of size of the LED display.
~Cynthia H, Marketing/Sales, Shenzhen, China
Commercial signs (replacing old marque boards), brighter cooler led components.
~Other, Englewood, FL
Real time sharing, parallel shifting.
~Abhilash Gupta, Pursuing b.tech., Mandsaur, India
CMOS, OLEDS, nanotechnology.
~Miguel Rubén Bustamante Mendoza, Design Engineer, Querétaro, México
Led display control system
~Roger R, Technical Support, Shenzhen, China
High definition LED TV.
~Engineering, Design, Pune, India
Possibly, quantum dots
~Engineering, Consulting, Dublin, Ireland
Low light depreciation
~Marketing/Sales, Shenzhen, China
Digital signage
~Joe Lemischak, Sales, Elmsford, NY
Organic led
~Thomas L, Research & Development, Chung Li, Taiwan

Q:
From your perspective, which companies are creating the most innovative digital LED displays?
11 answers
Answers:
I think Gtek from China is creating the most innovative digital LED display, such as its Bri-curtain, very easy and quick to install, can save up to 70% energy while 60% weight comparing cabinet-based LED Screen.
~Cynthia H, Marketing/Sales, Shenzhen, China
Not sure, as I tend to favor the old "single die" type dot matrix displays.
~Stephen S, Engineering Consultant, Hamilton, MA
The perspective is now: low price, high technology, and full color signs.
~Attila Nemeth, Design Engineer, Budapest, Hungary
ShenZhen Lotus Optoelectronic Co.,Ltd
~Marketing/Sales, Shenzhen, China
SUNLED Forge Europa LUXEON Vishay
~Miguel Rubén Bustamante Mendoza, Design Engineer, Querétaro, México
Havells,Semantronics, L.G.electronics
~Abhilash Gupta, Pursuing b.tech., Mandsaur, India
Daktronics and Watchfire
~Other, Englewood, FL
Www.led-star.com
~Roger R, Technical Support, Shenzhen, China
SONY, Samsung
~Engineering, Design, Pune, India
Oriale
~Engineering, Other, Bangalore, India
Osram
~Thomas L, Research & Development, Chung Li, Taiwan

Applications and UseTop

Q:
What are some of the applications you have used digital LED displays for?
17 answers
Answers:
We use the digital LED display for the situation of event, concert, show, etc, to have a live display, that will attract more focus and bring viewers brilliant visual effect....
~Cynthia H, Marketing/Sales, Shenzhen, China
Dot Matrix and Seven Segment Displays. Production Line Text Display. Bus Signs (Route Indicator). Clocks. Counters.
~Miguel Rubén Bustamante Mendoza, Design Engineer, Querétaro, México
Displays for instruments--voltmeters, counter/timer, Geiger counter, alphanumeric
~Stephen S, Engineering Consultant, Hamilton, MA
Advertising display, transportation sign display, public information display
~Marketing/Sales, Shenzhen, China
I have a is a moving led sign manufacturing enterprise
~Attila Nemeth, Design Engineer, Budapest, Hungary
1. I/O circuit use for switching. 2. For display.
~Engineering, Design, Kolkata, Kazakhstan
Digital Flow meters, Digital temp indicators
~Engineering, Design, Pune, India
Digital counters, watches, moving displays
~Abhilash Gupta, Pursuing b.tech., Mandsaur, India
We produce and sell led display.
~Roger R, Technical Support, Shenzhen, China
Primarily for message boards
~Other, Englewood, FL
Consumer electronics
~Thomas L, Research & Development, Chung Li, Taiwan
Alphanumeric display
~Engineering, Other, Bangalore, India
Marketing Project
~Engineering, Consulting, Dublin, Ireland
Digital Signage
~Joe Lemischak, Sales, Elmsford, NY
Panel meters
~Manufacturing, BANGALORE, India
MCU control
~Suha O, Student, Dunaujvaros, Hungary
Boards
~Marketing/Sales, Bangalore, India

Q:
Please share with us any “non-standard” applications that digital LED displays have been used for.
7 answers
Answers:
It would be wonderful if commercial designers could get a Dot Matrix Display (let´s say 25x49 dots) with an RGB feature, all Cathode or Anode Common for different color so the DMD can switch easy from one color to another without needing a multilayered PCB.
~Miguel Rubén Bustamante Mendoza, Design Engineer, Querétaro, México
I think they make excellent displays for things like caller ID boxes, but right now they are too expensive for that application.
~Stephen S, Engineering Consultant, Hamilton, MA
Sphere LED display screen
~Marketing/Sales, Shenzhen, China
Transparent display,
~Thomas L, Research & Development, Chung Li, Taiwan
In foggy regions.
~Abhilash Gupta, Pursuing b.tech., Mandsaur, India
Smart packaging
~Engineering, Consulting, Dublin, Ireland
Movie theater
~Roger R, Technical Support, Shenzhen, China

Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of digital LED displays?
4 answers
Answers:
Bad resistor selection is a common mistake, because users usually select the same resistor they calculate on DC current as well as in pulsating current, so the results may be different from what they expected. When an LED is attached to a solenoid to indicate when it is working, always add a protective Diode (rectifier type) to prevent break down voltage that could damage the LED.
~Miguel Rubén Bustamante Mendoza, Design Engineer, Querétaro, México
If you are multiplexing digits, be careful that the multiplexer never halts. If the peak segment current exceeds the max average current for the display and is dumped into a single digit continuously, it will damage the display instantly. Also, never drive an LED directly with a voltage source, use a current source or current limiting resistors.
~Stephen S, Engineering Consultant, Hamilton, MA
When it is power on, do not plug in or out the HUB card, otherwise the chip will be burned out.
~Cynthia H, Marketing/Sales, Shenzhen, China
Keep the led display showing one static pic for a long time.
~Roger R, Technical Support, Shenzhen, China

FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
11 answers
Answers:
Introduce lower cost smart LED displays, or produce some single chip display driver solutions for 5x7 dot matrix displays.
~Stephen S, Engineering Consultant, Hamilton, MA
Energy-saving, environment protection Very quick and easy to install and uninstall Convenient for moving
~Cynthia H, Marketing/Sales, Shenzhen, China
Dot Matrix Led Display easily assembled on Big Panels Construction.
~Miguel Rubén Bustamante Mendoza, Design Engineer, Querétaro, México
High resolution, low power consumption, long life, high brightness
~Thomas L, Research & Development, Chung Li, Taiwan
Super LED display High brightness Low power use
~Roger R, Technical Support, Shenzhen, China
Low prices tree and full color moving LED signs.
~Attila Nemeth, Design Engineer, Budapest, Hungary
Should be compact and portable.
~Abhilash Gupta, Pursuing b.tech., Mandsaur, India
Price-performance competitive
~Marketing/Sales, Shenzhen, China
Smaller and brighter
~Joe Lemischak, Sales, Elmsford, NY
Mico-LED arrays
~Engineering, Consulting, Dublin, Ireland
Not yet decided
~Engineering, Design, Pune, India

Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using digital LED displays?
6 answers
Answers:
When you buy an LED display, you may check if it is good or not according to the following factors: 1. Brightness and view angle 2. White balance effect 3. flatness of the display 4. if there is mosaic or blind spot 5. nature color restoration
~Cynthia H, Marketing/Sales, Shenzhen, China
Consider high efficiency LED types, as power supply requirements may be high for standard efficiency types. Be sure your system has enough power to drive displays you are interested in.
~Stephen S, Engineering Consultant, Hamilton, MA
Datasheet must contain all necessary information and application circuit or test circuits also.
~Miguel Rubén Bustamante Mendoza, Design Engineer, Querétaro, México
Pay more attention to quality and after sale. Service, not price!
~Roger R, Technical Support, Shenzhen, China
It must have all the required conditions.
~Abhilash Gupta, Pursuing b.tech., Mandsaur, India
Use commercial / industrial products
~Joe Lemischak, Sales, Elmsford, NY

Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of digital LED displays?
6 answers
Answers:
Be sure the display type/form factor is available from multiple sources. Also, look for multiple sourced driver ICs TI and ST make some interchangeable driver ICs. If it is a large display, or there are many displays and segments, consider the worst case current draw, and design accordingly.
~Stephen S, Engineering Consultant, Hamilton, MA
For new application ask the supplier for free samples or visit so you can make sure you have the LED you need after production release. Always test the LEDs in similar conditions as they are going to be used for.
~Miguel Rubén Bustamante Mendoza, Design Engineer, Querétaro, México
For an outdoor big size LED display, you should keep regular checks for lightning proof device, especially after every rainy season.
~Cynthia H, Marketing/Sales, Shenzhen, China
Beware of the viewing angles and working temperature
~Joe Lemischak, Sales, Elmsford, NY
Keep in touch with the engineer of your provider.
~Roger R, Technical Support, Shenzhen, China
Using high RAM processors or controllers.
~Abhilash Gupta, Pursuing b.tech., Mandsaur, India


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