>
New Topic
>
Reply<
Esato Forum Index
>
Sony Ericsson / Sony >
Android
> Xperia arc discussion Thread
Bookmark topic
No it looks grey on the Arc
--
Posted: 2011-01-09 15:49:00
Edit :
Quote
On 2011-01-09 15:39:01, Arne Anka wrote:
On 2011-01-09 15:15:02, avmaxfan wrote:
Its still a LCD though so its still not absolute black unlike AMOLED which have perfect blacks
They are all TFT active matrix LCDs with different techonolgies to illuminate.
Nope ! OLED has nothing to do with TFT LCD. They are both completely different technologies and not related to each other. "LED" is LCD at the end of the day but not OLED.
OLED screens don't use any back lighting like "LED" or LCD screens and hence they can reproduce perfect blacks as there is no light emitted at all.
In comparison LED/LCD use back lighting and hence while displaying blacks there is still some light emitted which doesn't let LCDs attain perfect blacks.
--
Posted: 2011-01-09 16:20:23
Edit :
Quote
How well do you guys think the screen on the Arc will stand up to the Nova display on the LG Optimus Black or say Super AMOLED plus displays on the new Samsung phones that are later released this year??
--
Posted: 2011-01-09 16:32:34
Edit :
Quote
On 2011-01-09 16:20:23, avmaxfan wrote:
Nope ! OLED has nothing to do with TFT LCD. They are both completely different technologies and not related to each other. "LED" is LCD at the end of the day but not OLED.
OLED screens don't use any back lighting like "LED" or LCD screens and hence they can reproduce perfect blacks as there is no light emitted at all.
In comparison LED/LCD use back lighting and hence while displaying blacks there is still some light emitted which doesn't let LCDs attain perfect blacks.
True, no backlight is used in amoled as in LCDs. My misstake. However, amoled still uses TFT to control the pixels. But that is another story.
--
Posted: 2011-01-09 16:44:27
Edit :
Quote
What type of display is the iphone 4?? I ask cos having had both the Galaxy S and iphone 4 I can honestly say they are neck and neck in terms of sunlight viewing. The original x10 is also excellent in sunlight and I think it can also be down to if the manufacturers use non reflective screens. Colours on an amoled screen are much more saturated
--
Posted: 2011-01-09 17:31:00
Edit :
Quote
Iphone 4 has a retina display, while the Galaxy S had super AMOLED.
--
Posted: 2011-01-09 17:43:20
Edit :
Quote
On 2011-01-09 17:31:00, Bonovox wrote:
What type of display is the iphone 4??
To my best knowledge it is a TFT LCD of IPS (In-Plane Switching) type (refered to as retina display by Apple), if that means anything to you.
[ This Message was edited by: Arne Anka on 2011-01-09 17:39 ]
--
Posted: 2011-01-09 18:05:54
Edit :
Quote
Okay,
LCD basically can't produce light, it's just a light switching technology in a small case, There's a light source behind the panel, every pixel has 3 sub pixels, each sub pixel is covered with a colored filter, the whole pixel uses three color filter for each sub pixel: Red, Green and blue... the panel controls these sub pixels and how much they let the light leaks throught. by changing that it can produce varity of colors...
There's several kinds of backlighting for the panel...
- CCT : Cold Cathode Tube, basically something similar to a fluorencent light but it is NOT a flourencent light.. a vacume tube with some type of gases inside... these produces clear white color.. it has it's own problems as it works with high voltage, it needs inverter, and it's hot.. and consumes energy...
the tube is placed in different location behind the panel, normally at the bottom or edges... there's some thin layers made of special kind of polymers or plastic that can distribute the light evenly ( but not perfectly ) behind the panel..
- LED : Light Emitting Diods... a small simiconductor device that can emit light.. it has better energy efficincy than reular lights or CCT.. and there's several types of LED to use in this technology.
1- using white LED's : cheap but not accurate as White LED's are not 100% white.. they produce some kind of Blue or yellow tone depending on thier kind...
2- using RGB LED's : it uses three LED colors, Red, Green and blue... and control them indpently to produce a perfect White light... sometimes they uses two Green LED's or two Red LED in the addition to the other colors in order to have better color accurcy.. this can be called RRGB or RGGB
Both type has two ways of implemntation behind the panel
1- Edge LED lighting : the lighting is placed in the edge of the screen.. then the same polymer/plastic layers that is used in CCT to distribute the light is used.. this is cheaper and is used in several applications ( Sony uses them in thier intro level LED Bravia's )...
2- Back LED placing : just put the LED's directly behind the LCD panel.. this still use layers of plastic but for the purpose of diffusion as LED's can be seen as spots without these layers... this is more expensive than the first type as it requires much more LED's and in some cases smaller also...
Here's the point, LCD can control how much light.. but it's not perfect. I mean if you choosed to block completly then it won't block 100% of the light this is why black is not perfectly black in LCD tech. and in the same time allowing light to go through is not perfect also so backlighting must be brighter in order to have the required brightiness.. and this also consumes energy...
these elements controls the features and spec. of LCD vs. AMOLED as AMOLED can produce it's own light, it does not require back lighting... but there's some catchs
1- AMOLED can save energy but not in case of white or bright color.. in a clear white or bright colors all pixels and sub-pixels in the panel will work and brighter will mean more energy.. and having one big source of light is more efficiet than having thousends of of lights... infact in white color AMOLED can consumes 3x the power required by regular LCD.. so guys with AMOLED ( or SAMOLED ), don't use white background...
2- AMOLED needs more layers over the light productions notibley the touch panel, this has big impact when it comes to high-light enviroments like in the sun, this is why LCD is still the leader when it comes to this. In-cell touch panels ( like Samsung's S-AMOLED ) solves this partly but still not perfectly... LCD still the leader in such enviroments...
3- Duo to the fact AMOLED can produce light by it's own... it has better blacks... but LCD can have perfect Blacks too... in Edge LED there's a technology that is invented by Sony to control some LED brighteness in so it can darkens specific regions.. this is good but it can't control small areas duo to the nature of the light distripution layers.. but in back LED placing. each light source ( 1 LED or RGB LEDs ) can be controlled indepently to control the brightness of smaller area than when using Edge LED.. the small area is not that small as it depends on how small the light source is ( each white one, and white LED or RGB array ) Sony uses this technology on their high-end LED Bravia ( the X-series )
Duo to price, energy consumption reasons the back LED placing is hard for Mobile phones... but Edge LED is wider used solution even in laptops...
We don't know which lighting solution
used in thier Arc... but the Mobile Bravia engine is just a software version of thier original Bravia Engine ( which runs on a a seperated processor in Bravia TV's ).. it's nearly a color correction and enhancment tech. Mobile Bravia uses software rather than hardware duo to energy and space required by a dedicated processor in the original Bravia TV's... but maybe Arc uses the SLCD also which is better than regular LCD's,,,
Basic facts
1- AMOLED + SAMOLED are not perfect, there's still some sides where LCD wins
2- SAMOLED is a trademark for In-Chip touch panel technology that is developed by Samsung, but Samsung is not the only one that makes In-Chip touch panel, AU Optronics also make them.. the point is Samsung did it's own and put a lot of R&D on this one...
3- S-LCD is jointly developed by both Samsung and Sony... both has 50% of shares but Samsung has 2 more shares than Sony...
4- Sony also did a lot of R&D in OLED ( not AMOLED ) but OLED is much much higher in cost duo to the fact it uses masks to be made... and masks are hard to use and make a lot of defects ( in case of OLED = dead pixels ).. and bigger the screen is, more defects will be... so it's just not ready for the mass market, the only OLED Sony made was small ( I think 11 inches ) and costs USD2500.. so just imagine how much a phone will cost if it uses OLED ( not AMOLED )
5- There's a type of LCD known as IPS, this is the one used by nearly all Apple products, and it is used in pro. LCD's too from other makers.. IPS can produce much better color accurecy than regular LCD's and maybe even more than AMOLED
--
Posted: 2011-01-09 18:13:56
Edit :
Quote
On 2011-01-09 17:43:20, dibdin wrote:
Iphone 4 has a retina display, while the Galaxy S had super AMOLED.
Yes,but is retina not just the pixels??
--
Posted: 2011-01-09 18:35:58
Edit :
Quote
@ Xajel,
It's due, not duo.
Grammar Nazi out.
--
Posted: 2011-01-09 19:07:17
Edit :
Quote
New Topic
Reply
