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>> AMOLED LCD will replace it? 6th,Dec,2017
In recent years, the debate over whether Active Matrix Organic Light Emitting Diode (AMOLED) shows the ability to replace Active Matrix Liquid Crystal Display (AMLCD) into next-generation mainstream display technology is rampant. However, So far no conclusion. At present, AMLCD has a mature industrial chain, and the cost of manufacturing a monitor is also gradually declining.
However, Samsung, represented by South Korean manufacturers are fully deployed AMOLED technology in mobile phone screen applications, which have their own mobile phone display screen replaced nearly Qicheng AMOLED screen, or even shut down its own 7th generation AMLCD mobile phone panel production line. In order to promote the development of AMOLED industry chain, Samsung also actively promote China-made mobile phones using Samsung AMOLED screen. Currently, OPPO, vivo, Meizu, Huawei, ZTE and other domestic mobile phones have been used Samsung AMOLED touch integrated screen, AMOLED display shipments continued to rise.
It is reported that in the second half of 2016, Samsung will continue to expand its cast in the AMOLED display size, and debug the new production line for next year, Apple's iPhone 8 mobile phone. According to IHS, a specialist market research agency, AMOLED's share of the display panel market continues to increase, currently accounting for 11% of shipments and rising to 22% by 2020.
In addition, Japan's Sharp and South Korea's LG are also studying and advancing, large-size AMOLED display. Sharp reported its 13.5-inch 4K2K AMOLED display at SID, an important conference area for display in 2012; LG reported on its 2014 SID and demonstrated its 55-inch Full HD AMOLED TV prototype.
As can be seen, the current AMOLED display limelight, compared to the AMLCD, AMOLED has a higher contrast, wider color gamut, lower power consumption, thinner, wider viewing angle, faster response, outdoor readability Stronger and so on. The following will compare the advantages and disadvantages of AMLCD and AMOLED from the perspective of technical principles.
First introduce the principle of AMLCD light. AMLCD is a kind of flat panel display technology that utilizes the photoelectric effect of liquid crystal to control the transmittance and reflectivity of a liquid crystal cell through a thin film transistor (TFT) circuit to generate different grayscales.
As the liquid crystal material itself does not light, so AMLCD is a passive light-emitting display, the need for backlighting. AMLCD structure shown in Figure 1. The backlight module generates a white backlight, which is converted into a uniform linear polarization in the vibration direction by the polarizer, and then passes through the TFT and the liquid crystal molecular layer. According to different voltage generated by the TFT layer, the liquid crystal molecular layer will have different angles of rotation to polarize the linearly polarized light, to reverse the direction of vibration, and then produce different colors through the filter, and finally pass through the second polarizer The first layer of vertical), to achieve the control of light intensity, and finally through the three different colors of red, green and blue light intensity combination to achieve different colors and grayscale.
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Unlike AMLCDs, AMOLEDs are self-illuminating displays that do not require a backlight and whose light-emitting components are organic light-emitting diodes (OLEDs). By controlling the brightness of the red, green and blue OLED subpixels, different colors of light can be emitted. The brightness of the light depends on the current flowing through the OLED. The gray level of the pixels can be controlled by controlling the current flowing through the OLED. Figure 2 shows the structure of the AMOLED display. AMOLED panel due to the reduction of the backlight module and the first polarizer, so lighter AMOLED. AMOLED display thickness is about 30% of AMLCD, AMOLED mobile phones have been included in the Guinness Book of Records due to its extreme thinness.
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AMOLED has higher contrast than LCD. In addition to the weight advantage, due to the use of the backlight layer, and the backlight can not be completely closed, so there will be leakage of LCD screen there, so its contrast will be affected. With AMOLED displays, in theory, OLEDs can have zero brightness and therefore high contrast if no current flows through the OLEDs. Tests show that, AMOLED contrast up to 13000000: 1, enough performance of the picture light and dark enough to give a vivid sense of reality, especially at night shooting, the difference is even more apparent. In addition, since the AMLCD requires two polarizers, the energy will be reduced and the maximum brightness will be less than the AMOLED. Figure 3 shows a comparison AMLCD and AMOLED picture shows the effect, we can see more bright AMOLED bright part of the dark part of a more detailed. In addition, AMOLED moderate brightness, not dazzling, the lowest brightness can be displayed in the cinema, bedroom and other lights look at the phone when the dark place will not be dizzy and tired, you can protect the eyes.
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