The main question of fans of TV World and displays is, was there any problem with flat panels that curve panels introduced? What about the future of this technology? And, will it be common or not? In the following, we will discuss about the philosophy behind introducing curve panels and its future.
Mechanism and creating of color and light
How is curve or organic LED and how are colors and light created? Every single pixel of Curve TV can On/Off, separately. In modern LCDs, backlight is sourced from Light Emitting Diodes (LED) and this is the basic difference between Curve TVs and modern LCDs.
An organic layer is placed between two metallic layers that are anode and cathode, actually. Passing electrons through organic layer cause light emission. Depending on the organic compound, the color would be red, green or blue. It is worth mentioning that black is the result of turning LEDs off and as a result, depth of black and contrast ration would be great.
Cinema and use of curved screens
Concave screens are used for two reasons at cinemas:
• First, source of light are lens and projector and have dotted condition. Light is reflected on the screen and make images. If used screen be flat, distance of image source to different points will be different, therefore at edges and corners, image distortion would be more. This effect is known as Pincushion effect.
• Second reason is that, distance of seat to screen is so short, and to increase audiences distance, concave screens would be used. Audience have to move their head much less using this approach.
you watched IMAX DOME movies yet, the advantages of concave screen are clear
for you, especially if you are sitting under the projector that is the best position
to watch the image indeed. IMAX DOME movies with use of Fish Eye are recorded, so
that the viewing angle of camera is very high. When Showtime, projector has the
same lens and reflect the image on a wide surface like a hemisphere; that’s why
audience enjoy the images all around himself. Picture below shows one of the
IMAX DOME theatres:
The best position to watch a movie
The best position to watch movies reflected on concave screens is the center of arch that formed the curved surface display. The points that its passing lines are perpendicular to display surface are the best positions to watch. In IMAX DOME, the best position to watch, and projector location is the center of sphere. Manufacturing companies explained about Horopter concept in binocular vision. This curve is consisted of some spatial points that is visible for our two eyes.
Floating in a comprehensive image
The most important question is that, how much the image on a Curve TV is more realistic than the flat TVs? Certainly curved panels make better user experience, just like IMAX movies. In the other word, watching movies at big screen at cinema is more interesting than curve TV. The point is that size of the screen and the distance of audience determines the experience of floating. However, the larger the screen is and the distance is shorter, TV covers the most of audience's viewing angle. Using a 55"(inches) TV can make the good experience of a wide image, especially when your distance is not suitable.
THX offered a general guidance for optimal distance from TV and if you act in accordance with the guidance, TV will cover 40 degrees of your viewing angle, it means suitable degree to experience a wide image.
Increasing viewing angle and contrast ratio
The main question is, considering quantity and quality of available TVs, do we need increasing and optimizing of viewing angle and contrast ratio? If this is a general question, the answer would be vague, but about Curve TVs answer is negative. There are no problems neither with viewing angle nor contrast ratio in curved panels. Indeed, these two are strength points of Curve TVs, but about LCD TVs, there is still hope of optimization.
We can reduce the distortion on the edge and the corners, especially when sitting at short distance. When talking about monitors, the problem is more clear, because distance of user is much shorter. If you own a LCD monitor with a TN panel, you have already experienced the problem. TN panels or Twisted Nematic panels are the most common type of LCDs. The contrast ratio would be different considering the fact that at the corners of monitor, viewing angle is not 90 degrees. There is the same issue about colors quality too.
When we talk about TV, the issue is a little different. First difference is that, usually several people sit in front of the TV; in this case all audiences are not at the sweet spot (optimize spot) to watch, only one can sit at the best spot (sweet spot). of course, about flat TVs, the sweet spot to watch, is in front of the TV, exactly; a place where the person's angle is the same with the corner of the image. So this concept is not limited to Curve TV.
But, is Curve TV better than flat TV in terms of viewing angle? It is better we compare everything visually.
The width of the 55 inches TV is about 120 cm. if you move from sweet spot to another spot, as you can see in above picture, your angle to one end of TV becomes less than 90 degrees, and to the other end would become more than 90 degrees. If you continue moving, will reach a spot where your angle to closer end is 180 degrees; on the other hand, you are parallel with it. In this position, you can't watch the closer end, and basically no one watch TV in this spot.
This is true about flat panels too; the difference is that changing angle is less. Given that most of typical LCD TVs have LED backlights, if audience moves further from sweet spot (in front of the TV), and his/her angle become less than 90 degrees, its undesirable effect will be obvious on contrast and color quality. If the audience is supposed to sit in the green zone, it is better to use Curve TV, otherwise flat panels are better choices.
Of course this rule is not so strict, and it is possible that the area of green zone become would expand due to better color quality and higher contrast; however, the general rule is that sitting out of green zone has a negative effect on viewing angle, depth of black color, and quality of colors.
It is known that, the more your couch is closer to TV, the more people can be placed in the green zone. Also, Increase in radius of curvature of TV can enlarge the green zone.
At last and in answering the question that, does curve TV increase the viewing angle or not? The answer is yes, provided that you sit on the right spot (sweet spot).
If we want to compare Curve TVs with LCD panels, especially with Samsung products, we come to the conclusion that Curve panels are better and preferred.
Curved displays seem bigger
Curved panel seems bigger than its real size, because its curvature covers more of man's viewing angle. The distance is less; the display seems bigger. You can see this phenomenon in picture below.
Advantages of curved TV:
• Reduce reflections
• It seems bigger than its actual size
• If the panel is a monitor, there would be no problem such as viewing angle and contrast ratio using sweet spot.
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