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| Les
écrans LCD standard ne sont pas lisibles dans toutes les conditions, il
existe des technologies permettant de les utiliser dans un
environnement très lumineux. | Standard
LCD screens are not legible in bright light environments. Specific
technologies exist to provide outdoor or sunlight readable LCD screens.
He is a simple description | En ce qui concerne la lisbilité à l'exterieur, il y a 3 principales catégories d'écrans
1-
LCD de technologie standard, avec éclairage par l'arrière (backlight),
lisible à l'intérieur. Ces écrans sont dits "transmissifs"; les sources
de lumière importantes, sans parler du soleil
direct, empêchent de lire correctement car la luminosité extérieur est
plus forte que celle de l'éclairage interne de l'écran.
2-
LCD optical bonding : C'est une technologie
anti-reflet efficace, la lisibilité à l'extérieur est bonne, mais en
soleil direct n'est pas suffisante.
3-
LCD transflectif : leur lisibilité à l'extérieur et en plein
soleil est excellente. En plus de l'anti-reflet, la luminosité
extérieure est réutilisée par l'écran pour
sa proche luminosité, sans accroitre la consommation électrique. L'écran est plus lumineux en plein soleil, ce qui est nécessaire pour compenser sa luminosité.
Note: pour
chacune des 3 catégories, on peut equiper les LCD d'une luminosité plus
forte que la luminosité "standard". La consommation electrique est
alors plus forte. | As far as outdoor legibility is concerned, there are 3 main types of LCD displays:
1-
Standard LCD technology, readable in normal indoor light; they use
backlight (fluorescent or LED), they are called transmissive. They are
not legible in very bright environmment, not to mention in direct
sunlight, because external brightness overwhelms the backlight.
2-
OPtical bonding LCD : indoor legibility is excellent (unchanged), it is good outdoor
in bright light, poor in direct sun light.
3-
Transflective LCD : Legibility is excellent in all environments. The outdoor light is reused by the LCD panel to enhance its brightness, without increasing electric consumption. Actual brightness in the sun is higher than indoor. It is necessary to compensate the extremely high brightness in sunny conditions.
Note
: independantly from the 3 types of LCD mentionned above, LCD can be
equiped with high brightness lights. In that case, electric consumption
is increased. |
| Environment | Description | Indoor Performance | Outdoor Performance | | Indoor | Standard LCD module | Excellent | Poor | | Outdoor | Antiglare surface to reduce sun reflection | Excellent | Good | | Sunlight | Transflective type LCD, enhance brightness under sunlight | Excellent | Excellent |
 |  |  | Transmissive is the Standard technology used in most consumer and commercial notebooks.
The LCD light is produced by a backlight using lamps or LED. | Reflective LCDs use the outside light. The light
is reflected by a mirror behind the LCD. This technology works in bright environments.
Reflective LCDs are not bright enough in most indoor environments, and invisible in dark rooms or outside at night.
Frontlights can be added to reflective LCDs.
| Transflective LCDs combine both transmissive (backlight) and reflective technologies (mirror).
The
mirror used in transflective LCDs must let the backlight through and
reflect outside tlight at the same time; therefore transmissive
LCDs are not as bright outdoors as pure reflective LCDs.
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