Tag Archive | maths

Technology – Is a black pixel on or off?

Bright Lights (Tech Radar)

[Note: This post is random post about Light Emitting Diode (LED). For more startup related messages, visit our main site.]

In a recent Techzing Podcast the guys spoke about the deceptively inefficient Yelp rating system. On a unrelated topic they briefly raised the question: is a black pixel on or off?

The curiosity got the better of us and we spent some time googling the answer. In summary LED turn the pixel off to display black. However in older display technology, the answer differs. We share the results below.

Pre-Flat – Blocks Light:

In the world before flat screens, screens had a big flat light at the back that was always on.

“If a pixel wanted to show you white it lets all the light through. If it wants to show you black it blocks all the light. Either way, the light behind is still on and still consuming the same power.”

(Source: Steve Mould)

LCD – Blocks Light:

“Liquid Crystal Display (LCD) pixels do not produce there own light. If the pixels are off, they don’t let the backlight through, when they are on, they let the backlight through.”

(Source: About.Com)

AMOLED – Turns Off:

To display black, AMOLED (active-matrix organic light-emitting diode) turns off the pixel. As a result you can save your battery by displaying black.

(Source: Wikipedia)

For more information you can visit the Nokia Developer site for their study on how color makes a difference.

Steve Mould test the hypothesis with some impressive calculations. His post How much phone battery can you save by switching to dark wallpapers and themes? provides an insight into extending the life of your phone battery.

We are not scientists, so drop us a line if we have mixed up the facts!

.

You might also enjoy:
+ April Fools Day – Some of Our Favourites
+ Friday 13th – 3 interesting facts
+ Happy New Years – Bring on 2012!

Welcome new readers! If this is your first time here, you might want to start with a new article or read through our older submissions.

Where to next? Check out a random article.

Stay in touch: Check us out via RSS Feed, Twitter, Google+ and Facebook.

Join the conversation: Leave a comment or this post.

April Fools Day – Some of Our Favourites

Happy April Fools Day! We hope you didn’t get caught out by any of today’s shenanigans. If you did, maybe set a diary reminder for next year?

There were some great entries this year as major brands got involved. Ikea, Google, The Economist, Microsoft Kinect, BMV, Mini, Virgin, Sainsbury, The Independent, Innocent Smoothie, Marmite, Walkers, The Daily Mail… plus many more had a go.

We enjoyed Ikea’s allen key recall and Google’s proposed Gmail Tap. Which ones did you enjoy? Please share!

For more check out the following two handy summaries:

April Fools Day Round-Up 2012 (The Poke)
April Fools’ Day roundup: the big toys, the small toys and the cats (Engadget)

If you like dates and numbers you can always check our these two earlier posts:

Leap Year – 3 interesting facts about 29 February
It’s a numbers game – 11/11/11 @ 11:11:11

.

You might also enjoy:
+ Friday 13th – 3 interesting facts
+ It’s a numbers game – 11/11/11 @ 11:11:11
+ Happy New Years – Bring on 2012!
+ Social Media Experiment – Twitter, Google+ and now Facebook

Welcome new readers! If this is your first time here, you might want to start with a new article or read through our older submissions.

Where to next? Check out a random article.

Stay in touch: Check us out via RSS Feed, Twitter, Google+ and Facebook.

Join the conversation: Leave a comment or this post.

Leap Year – 3 interesting facts about 29 February

Our obsession with strange dates continues with the 29 February. The oddity that appears every four years*, allowing our calendars to match up with the earth’s orbit.

Here are three interesting bits of information on this special day:

1. Why the extra day?

The leap year’s extra day is necessary because of the “messiness” of our Solar System. One Earth year (a complete orbit around the Sun) does not take an exact number of whole days (one complete spin of the Earth on its axis). In fact, it takes 365.2422 days, give or take.

Source: BBC Magazine

2. How do we calculate Leap Years?

In the Gregorian calendar 3 criteria must be met to be a leap year:

The year is evenly divisible by 4;
If the year can be evenly divided by 100, it is NOT a leap year, unless;
The year is also evenly divisible by 400. Then it is a leap year.
This means that 2000 and 2400 are leap years, while 1800, 1900, 2100, 2200, 2300 and 2500 are NOT leap years.

The year 2000 was somewhat special as it was the first instance when the third criterion was used in most parts of the world since the transition from the Julian to the Gregorian Calendar.

Source: Time And Date

3. Any famous birthdays?

A person who is born on February 29 may be called a “leapling” or a “leap year baby”. In non-leap years, some leaplings celebrate their birthday on either February 28 or March 1, while others only observe birthdays on the authentic intercalary dates.

In the United Kingdom and Hong Kong, a person born on February 29 legally attains the age of 18 on March 1 in the relevant year.

Source: WikiPedia

Happy Leap Year Day!

.

You might also enjoy:
+ April Fools Day – Some of Our Favourites
+ Friday 13th – 3 interesting facts
+ It’s a numbers game – 11/11/11 @ 11:11:11
+ Happy New Years – Bring on 2012!

Welcome new readers! If this is your first time here, you might want to start with a new article or read through our older submissions.

Where to next? Check out a random article.

Stay in touch: Check us out via RSS Feed, Twitter, Google+ and Facebook.

Join the conversation: Leave a comment or this post.

It’s a numbers game – 11/11/11 @ 11:11:11

We don’t claim to be mathematics freak or number men. In fact we don’t really enjoy calculations all that much. We do appreciate they play an important part in our lives and being able to understand figures is a necessary skill for everyone. Seeing little patterns or quirks in an Excel spreadsheet or utility bill does make our day. Yes, how very sad! So today is really special.

The guys over at Time and Date have taken this a little too far. They have even provided you with more 111 combinations – like your age in seconds today if born on Wednesday, 25 August 1976 (1,111,111,111 seconds old). Happy Birthday?

Anyway, here is some bedtime reading for you:
http://www.timeanddate.com/date/11-11.html

.

You might also enjoy:
+ April Fools Day – Some of Our Favourites
+ Friday 13th – 3 interesting facts
+ Happy New Years – Bring on 2012!

Welcome new readers! If this is your first time here, you might want to start with a new article or read through our older submissions.

Where to next? Check out a random article.

Stay in touch: Check us out via RSS Feed, Twitter, Google+ and Facebook.

Join the conversation: Leave a comment or this post.

Follow

Get every new post delivered to your Inbox.

Join 315 other followers

%d bloggers like this: