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>> LGD automotive OLED panel research and development to the double stack structure forward 11th,July,2017
Korean panel manufacturers in the automotive OLED display structure and the development of organic materials to speed up the pace. Compared with the smart phone, TV, car panel on the temperature and humidity requirements of the environment more stringent, the external vibration is also very sensitive. Therefore, to improve the display of the general characteristics of the direction of focusing on the extension of life, enhance the reliability of research and development. According to the Korean media Kinews 5/24 reported, LG Display (LGD) and Samsung Display (SDC) were publicly identified vehicle OLED display structure.
Automotive OLED than the smart phone, TV with OLED reliability requirements to be high. The display is not only able to withstand high pressure but also in the case of minus 40 degrees Celsius cold or zero 95 degrees Celsius under extreme high temperature conditions to maintain a stable performance. Reliability of the test conditions: temperature 40 degrees, 95% of the standard humidity conditions, the normal work of more than 2000 hours. Brightness requirements: because the need for strong sunlight can also be clearly visible, the general brightness requirements 450 ~ 500 cd / ㎡, special conditions require brightness in the 600 ~ 1000cd / ㎡ above.
At present, the two companies in the continuous OLED organic materials research, and at the same time to determine the structure of the automotive OLED organic material color layer.
LGD in the existing small and medium size OLED used in the red? Green (blue) structure in accordance with the WOLED structure to do double stack (Tandem) structure research and development. In the structure of RGB, the light emitting layer (EML) is stacked in a two-layer structure. Red + red, green + green, blue + blue, EML will be 2 layers to double contact (double contact) luminous material life and efficiency.
But between the two layers of EML need to add a separate charge generation layer (Charge Generation Layer, CGL). The CGL is the voltage assigned to the upper and lower layers to cause the element to emit light. Respectively, in the lithium-containing electron transport layer (ETL) N-type CGL and P dopant charge transport layer P-type CGL. The role of these two layers is to allow the electrons in the ETL to easily penetrate into the holes of the HTL. The N-type CGL uses ETLs that are faster than existing electronic transmissions.
The elements of the double-layer superposition structure can be separately emitted, and the CGL layer increases the photon emission of electrons and holes. So that the life and current efficiency of OLED organic components will be doubled. In addition, because the two layers together to light up the brightness and other quality problems. LGD has applied for a patent for double stacking and CGL construction.
With the OLED screen of the Cadillac luxury sedan concept model ESCALA (Source: Cadillac)
In contrast, Samsung shows the use of existing smart phones using small and medium size OLED display the same single-layer RGB structure to do with the automotive OLED display. In order to improve the reliability of components, plans to use temperature, moisture and other environmental adaptability to adapt to the organic materials.
Industry sources, small and medium size OLED competition behind the Samsung show LGD in product development more active, the current LGD OLED applications for a variety of applications are increasing investment.
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