Search found 31 matches

by focus
Thu Jul 11, 2019 10:10 pm
Forum: LED Backlights
Topic: Do led backlight wear out?
Replies: 1
Views: 12153

Re: Do led backlight wear out?

So the question is if a LED will wear out or burn out? Yes, at some point, all good things must come to an end. LEDs are good for more than 100K hours What most people look for in an LED is the half-life. LEDs slowly dim over time; half life is the time, in hours, of how long the back-light can oper...
by focus
Thu Jul 11, 2019 10:04 pm
Forum: TFT Display
Topic: Can you increase tft brightness?
Replies: 1
Views: 5949

Re: Can you increase tft brightness?

Yes, TFTS can be made brighter. There are a few ways to accomplish this. First, TFTs provide 64K or 64M colors and many can display video. But they don't do very well in direct sunlight. If you need a TFT to be readable in direct light, you can order a transflecive https://focuslcds.com/journals/tra...
by focus
Thu Jul 11, 2019 9:56 pm
Forum: Segment LCD
Topic: What causes a segment too flicker
Replies: 1
Views: 10746

Re: What causes a segment too flicker

Most Segment displays use a 4:1 mux or a 1:1 mux. If the frequency is not optimized, it will flicker. Segment displays have a refresh rate of around 25%.

Some segment displays have a spi or I2C interface which monitor the refresh rate and avoids the flicker.
by focus
Thu Jul 11, 2019 9:53 pm
Forum: Controls
Topic: What is the best display for an outdoor scale
Replies: 1
Views: 53970

Re: What is the best display for an outdoor scale

There are many display technologies that work well outside. If you don't need multi-color and you need to save power (runs on batteries), a monochrome segment or character display will work. They do well down to -25C. If you need to go below that, you can add a heater. Also, monochrome works very we...
by focus
Thu Jul 11, 2019 9:49 pm
Forum: Segment LCD
Topic: What happens when segment gets too cold?
Replies: 1
Views: 10690

Re: What happens when segment gets too cold?

A segment display https://focuslcds.com/segment-lcd/ is a monochrome (single color) display that can display any number, some letters and custom icons. It is built with two pieces of ITO glass with a fluid between them. As with all fluids, once it gets colder, it slows down the response time and wil...
by focus
Thu Jul 11, 2019 9:42 pm
Forum: Segment LCD
Topic: Can a segment have a controller
Replies: 1
Views: 10832

Re: Can a segment have a controller

Yes. A segment, aka static display is one that displays numbers, icons and a few letters. Most Segment displays use a 4:1 mux or a 1:1 mux. A 4:1 mux means there are four (4) segments tied to every one pin. The display then runs as a 25% duty cycle. On a 1:1 mux (multiplex), there is one pin for eve...
by focus
Wed Jun 19, 2019 4:03 pm
Forum: Segment LCD
Topic: What is Ghosting
Replies: 1
Views: 10907

Re: What is Ghosting

Ghosting mainly happens with monochrome displays and most of those are segment displays. It is when a segment is not fully on or fully off. It can be confusing to the end user since they don't know if the icon/letter/number should be on or off. It is caused by under powering the segment or from cros...
by focus
Thu Mar 28, 2019 10:58 pm
Forum: LED Backlights
Topic: How to know which wire on a LED backlight is positive and/or which is negative?
Replies: 1
Views: 11973

Re: How to know which wire on a LED backlight is positive and/or which is negative?

The positive side of the LCD backlight is normally red, the other is black. LEDs are DC driven and must be wired correctly, unlike AC
by focus
Thu Mar 28, 2019 10:56 pm
Forum: OLED
Topic: What has a higher contrast? OLED or LCD?
Replies: 1
Views: 11870

Re: What has a higher contrast? OLED or LCD?

OLEDs have a higher contrast, but LCDs without a backlight require less power.
by focus
Thu Mar 28, 2019 10:55 pm
Forum: Character LCD
Topic: LCD or OLED? Which can operate in a wider temperature range?
Replies: 1
Views: 6205

Re: LCD or OLED? Which can operate in a wider temperature range?

OLED, but heaters can be added to keep the LCD operating in very cold temperatures.