First of all, a matter of concept: when talking about LED-lit displays, I mean new readers that incorporate a series of LEDs that give light to the screen and allow us to read in conditions in which ambient light is poor Or nonexistent. What comes to be the substitute of the traditional lamp, but much more "chachi" and, possibly, effective.
Light-emitting diode (LED) backlight screen technology is used in televisions and computer monitors as a way to illuminate liquid crystal displays (LCD). Traditional LCD displays use cold cathode fluorescent lamps, similar to traditional cathode ray tubes. They are considered a higher-end LCD display, since LED lighting technology offers advantages in image quality and product life. Led technology
LED lighting technology presents advantages over fluorescent cathode cold light bulb lighting as it can selectively illuminate and activate precise areas of the screen. Traditional LCD displays rely on a light bulb to illuminate the entire screen, making it difficult to create contrast between light and dark colors in different parts of an image.
Types of backlighting
LED backlit displays are manufactured in two ways: with perimetral lighting and local regulation. LED displays with perimeter illumination have LEDs along the edges of the display, which illuminate from the outside in. Local attenuation screens use an array of LEDs behind the screen for optimum contrast capabilities. Local attenuation provides the best image quality, but illuminated edge screens are often thinner.
Because LEDs are much smaller than cold cathode fluorescent lamps, there is more space available behind the display screen, greatly reducing the screen box area, also known as the bezel depth. This allows manufacturers to create extremely thin and thin designs - as thin as 9 mm wide, from the date of publication. They are easier to hang and install than traditional LCD screens.
Eco-friendly LED backlit lightbox displays
LED lights are more energy efficient than cold cathode fluorescent bulbs, and they brighten the screen more efficiently, resulting in 40 percent energy savings over traditional LCD TVs, according to CNET Asia. LEDs produce less heat when operated, resulting in longer product life. They also do not use mercury or other toxic metals in their construction, making the layout more environmentally friendly as well.
Faced with this, we have LED backlit displays , which are nothing other than the normal computer or tablet screens, which for smaller devices are made with led instead of other elements, and that emit light from the screen to our eyes. Having said that, let's gut the matter a bit.
A few weeks ago the Tagus Lux (light in Latin, so very original) came to market, which has nothing to envy (or yes) to Kobo Glo or Kindle Paperwhite . All of them have the most prominent (and novel) elements illuminated by led, but I have to admit that I'm a bit classic for these things and I can not avoid a question come to my mind every time I see a reader with the screen lit By led: is it really necessary?
Until Glo placed his duck under the door (more or less), it was normal to praise the advantages for our eyes of electronic ink and, for moments of low light, to put an external led lamp or a sheath with light Which provided the illumination we needed to read without damaging our eyes . Because, to deny it, the care of our eyes is the main advantage of an electronic ink screen (e-ink for friends).
Someone will say that: "I have been told that the backlit light box display are not so bad for the view." True, I have to spend a few hours a day in front of a computer for work reasons and I have no vision problems (for now). But I will not deny that the day I do not use the computer my eyes do not itch or hurt me, although I have spent reading in my dear reader the same hours that I would usually spend working with the computer.
However, for a while to this part do not stop coming out new models with what seems essential: a small set of led that illuminates the screen in a "uniform" way and that improves our reading experience ... That's it, but the lighted screens Do they really improve it?
I have had in my hands a Kindle Paperwhite and indeed, the initial reading is more pleasant, the text is clearer, but in the long run will my eyes not suffer? Because if I have spent a little money on a reader is because I appreciate my eyes, otherwise I would have bought a tablet that is much more versatile.
The main advantage of electronic ink is precisely its increasing similarity with paper, with a traditional book. The need for a light source that illuminates the screen to read instead of emitting light to us reduces the fatigue of our eyes . However, displays with built-in illumination seem to be at odds between the "pure reader" (which tires little view) and backlit displays (which can be a disaster for the eyes).
The leds that surround the screen illuminate it evenly (although not as much as the manufacturers claim) and with an angle that does not directly affect our eyes , which allows us to read with the advantages of electronic ink but without the drawbacks of Backlit displays. That way we also avoid the reflections that a led lamp can produce on our screen.
In addition to this, several readers of this type have high contrast HD displays , with a resolution higher than usual (not exceeding 600 × 800), which is an added advantage over the "normal" screens. I leave you a small list with the readers with illuminated screen and HD:
- Kindle Paperwhite
- Kobo Glo
- Tagus Lux
- Onyx Boox i62HD Firefly
- Bq Cervantes Touch Light
- Bookeen Cybook Odyssey HD Frontligh
- FNAC Touch Plus
Apart from these, we can not forget readers who, like the Nook, add to the illuminated screen without changing the original resolution of 600 × 800 .
Having seen this, I have to admit that in most cases the illuminated screens have a greater clarity than their unenlightened sisters, although it is not as uniform as its manufacturers want to make us believe (even Amazon has recognized it from its Paperwhite). With them we can avoid the reflections that sometimes produce us the LED lamp that they incorporate in the case or that we have bought to read in low light, besides being more comfortable to have an "all in one" that to walk with the lamp of bars.