At the CES2016 conference, DELL released the UltraSharp 30, the industry's first OLED screen computer monitor. After listening to many years of thunder, we finally saw the first drop of OLED screens in the desktop display area. What is OLED? What advantages does it have over existing LED screens? After many years of trepidation, why isn't OLED screens quickly replacing LED as the new leader in the desktop area as expected by the industry?
What is OLED
The full name of OLED is Organic Light Emitting Display, which is an organic light emitting display. In terms of name, it differs from the LED display screen by only one letter, but actually they describe completely different things. OLEDs consist of a very thin coating of organic material and a glass substrate that emits light when current passes through it. It does not require a backlight (Figure 1).
The LED screen is actually a kind of LCD screen, which is used for TN, MVA, IPS or PLS panels. These panels do not emit light by themselves, and they need an additional light source to light up. Among them, the light source used by LEDs is a white light diode, LCD. The screen uses a cold cathode fluorescent lamp CCFL (ie, a fluorescent lamp). The display modes of the OLED and the LED are essentially different. Therefore, the two are not the same type of thing. The LED is a branch of the LCD display.
OLED screen advantages
OLEDs do not require the characteristics of a backlight, which determines that such displays will have a thinness that is far from comparable to LCD displays (Figure 2). At the same time, this feature also ensures that manufacturers can easily add a touch layer or curved surface design without the monitor appearing too thick. In addition, compared with LCD displays, OLED also has the following major highlights.
The second is higher contrast and faster response. Theoretically, the contrast of an OLED is almost limitless, and it does not leak light, so there is no possibility of color misregistration or black-down when watching a video (Figure 3). In addition, OLEDs are less likely to tear or smear like LCD monitors, but at the same time, many OLED panels currently have slow response speeds. At the same time, since the OLED display does not generate blue light without the backlight, it does not hurt the eyes like some LED displays.
Disadvantages of obvious advantages
Since the OLED has the above advantages, why has it been only slightly exposed in the field of mobile phones and televisions so far, in addition to DELL's first test of water in the field of desktop monitors did not follow? In addition to the obvious advantages of current OLEDs, there are also some problems. Which is more obvious is the OLED screen blue material life problems, the available time is about 14,000 hours, which is equivalent to the use of 8 hours a day can only use 5 years.
With the maturity of LED display technology and the continuous reduction of production costs, users can buy a LED display with a good display effect in just a few thousand yuan. At the same time, if the user is in high demand, it is entirely possible to select more characteristic products such as curved displays in the LED family according to needs and preferences (Figure 7). At present, even the top LED displays still have a much lower price than OLEDs, and diversification and cost-effectiveness also dilute the user's enthusiasm for OLED to a certain extent (Figure 8).
Unless some of OLED's existing technical barriers are broken and production costs are reduced to the same level as LED displays, OLED spring will really come. It will become the new generation of overlord in the field of desktop display like the current LED display.
What is OLED
The full name of OLED is Organic Light Emitting Display, which is an organic light emitting display. In terms of name, it differs from the LED display screen by only one letter, but actually they describe completely different things. OLEDs consist of a very thin coating of organic material and a glass substrate that emits light when current passes through it. It does not require a backlight (Figure 1).
The LED screen is actually a kind of LCD screen, which is used for TN, MVA, IPS or PLS panels. These panels do not emit light by themselves, and they need an additional light source to light up. Among them, the light source used by LEDs is a white light diode, LCD. The screen uses a cold cathode fluorescent lamp CCFL (ie, a fluorescent lamp). The display modes of the OLED and the LED are essentially different. Therefore, the two are not the same type of thing. The LED is a branch of the LCD display.
OLEDs do not require the characteristics of a backlight, which determines that such displays will have a thinness that is far from comparable to LCD displays (Figure 2). At the same time, this feature also ensures that manufacturers can easily add a touch layer or curved surface design without the monitor appearing too thick. In addition, compared with LCD displays, OLED also has the following major highlights.
OLED features determine that OLED TVs usually have more attractive thinness
The first is a wide perspective. Just like the flame of a candle does not change its color from any point of view, the characteristics of the self-illumination of the OLED determine its wide viewing angle. The 178 wide viewing angle technology that the LCD display took more than a decade to realize is for the OLED. Born. The second is higher contrast and faster response. Theoretically, the contrast of an OLED is almost limitless, and it does not leak light, so there is no possibility of color misregistration or black-down when watching a video (Figure 3). In addition, OLEDs are less likely to tear or smear like LCD monitors, but at the same time, many OLED panels currently have slow response speeds. At the same time, since the OLED display does not generate blue light without the backlight, it does not hurt the eyes like some LED displays.
High contrast does not occur with color aliasing or black impure
Third, the color gamut is very wide and can reach 110% NTSC. Some colors that do not accurately restore or exceed the display's color gamut on the LCD, such as bright yellow, can be well represented on the OLED (Figure 4). In order to solve the problem that LCD cannot display yellow accurately, Sharp first used Quattron technology in its high-end display in 2010. The technology enhances the color display capability of the LED display by adding yellow subpixels to the display screen outside the basic three basic colors of red, green, and blue. However, the actual results are far less than the excellent performance of OLED's yellow. OLED display can accurately show bright yellow
Fourth, OLED TVs can provide higher-density pixels and sharper images, allowing full display without sacrificing image resolution. For example, some 3D video applications are more immersive and do not feel much like LEDs. Disadvantages of obvious advantages
Since the OLED has the above advantages, why has it been only slightly exposed in the field of mobile phones and televisions so far, in addition to DELL's first test of water in the field of desktop monitors did not follow? In addition to the obvious advantages of current OLEDs, there are also some problems. Which is more obvious is the OLED screen blue material life problems, the available time is about 14,000 hours, which is equivalent to the use of 8 hours a day can only use 5 years.
OLED and lifespan are much lower than LCD
The current effective solution is to deposit a layer of blue material on the organic material coating. However, three other problems have emerged: the color cast and the resulting difficulties in production process and production costs. . The latter two issues are reflected at the product level, which will greatly increase the price of OLED displays. Taking the 30-inch resolution 4K OLED display Ultrasharp 30 (Fig. 6) as an example, the price is about 33,000 RMB. This is a surprising price, which is enough to make most users discouraged, and also allows Samsung, LG to be included. Most upstream panel makers including Display, AUO, and Chi Mei are cautious about OLED. Ultrasharp 30, which is almost unattended in China
In addition, some problems that appeared on the OLED TVs launched by LG and domestic brands also made the PC platform high-end users undecided. Many OLED TVs have more or less "burn-in" phenomenon during normal use, which means that the previous scene will remain on the panel for a while, which will affect the display of the current screen. In addition, the response speed of current OLED TVs is worse than that of top-level LCD TVs. This has also made many users who plan to spend a lot of money go back. With the maturity of LED display technology and the continuous reduction of production costs, users can buy a LED display with a good display effect in just a few thousand yuan. At the same time, if the user is in high demand, it is entirely possible to select more characteristic products such as curved displays in the LED family according to needs and preferences (Figure 7). At present, even the top LED displays still have a much lower price than OLEDs, and diversification and cost-effectiveness also dilute the user's enthusiasm for OLED to a certain extent (Figure 8).
The current trend is the 30-inch curved display
The price of one of the top UP2715K is also significantly lower than OLED
Edit Comment Unless some of OLED's existing technical barriers are broken and production costs are reduced to the same level as LED displays, OLED spring will really come. It will become the new generation of overlord in the field of desktop display like the current LED display.
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