At the Display Society "SID 2011" held in Los Angeles, the US, Samsung Mobile Display (SMD) papers were published more than in previous years. For example: 3 of the 4 papers presented at the "AMOLEDs and AMLCD TVs" conference were published by SMD, and all 3 papers at the "AMOLED Driving" conference were published by SMD. In the "3D TV: OLED" conference, SMD publications also accounted for 2 of the 4 articles. From the technical trends published in these papers, we can see the strategy of SMD.
At the "Mobile-Display Technology" conference, SMD released a top-emission organic EL panel driven by a low-temperature polysilicon (LTPS) TFT with five masks (Paper No. 9.2). The company's current generation 5.5 production line (substrate size 1300mm × 1500mm) may be based on this technology. The anode adopts TCO / Al-alloy structure (transparent conductive oxide / Al alloy structure) to ensure good reflectivity and organic EL characteristics. The resonant structure uses an Al film half mirror. Since the S / D electrode (source / drain) can be directly used as an anode using five masks, the construction period is greatly shortened compared to the original LTPS, and it is expected to improve production efficiency.
The trial organic EL panel is a 3.5-inch WVGA panel with a resolution of 267ppi. Through the five-mask process, the panel opening ratio is reduced compared to the original. Therefore, the adoption of a 2Tr-1C circuit (2 transistors-1 capacitor circuit) ensures an aperture ratio of 30% or more. There is no built-in error compensation circuit, so the display image is used in the inspection process to compensate the data signal of each pixel.
In the "AMOLED and AMLCD TVs" conference, SMD first published a report on "SGS (Super Grain Silicon)" (Paper No. 15.1), followed by a report on "SLS (Sequential Lateral Solidification)" using green lasers ( Paper serial number 15.2). According to the company, both technologies can support the 8th generation (substrate size of 2200mm × 2500mm) or larger. However, from the results of the uniformity evaluation of 32 cuts (4 sides × 8 sides) of a 14-inch organic EL panel using a sixth-generation substrate (substrate size 1500 mm × 1800 mm), SGS is one step ahead.
In addition, SMD also reported the driving technology of dynamically changing the power supply (set to the lowest voltage within the range that does not affect the operation) to minimize the power consumption of the organic EL panel (Paper No. 15.3). In order to counter LCD panels that are reducing power consumption, such detailed technologies are also needed.
As can be seen from these publications, SMD is always pursuing "to what extent can the production efficiency of LTPS be improved", and is also developing a new generation of high-efficiency TFT technology (SGS, SLS, oxide), and calculating new technologies Time to replace old technology. It can also be seen that SMD is studying and applying application technologies that can compete with LCD panels from multiple angles.
Developed a variety of practical driving technologies for 3D organic EL TV
In the "AMOLED Driving" conference, three papers were published by SMD, and all related to the driving technology of organic EL panels supporting 3D.
The first article is about the publication of the "Interleaved Scan" 3D driving method at 120 Hz, which has been selected as Distinguished Paper (Paper No. 21.1). This technology improves the original driving method of lighting all lamps after writing in the full screen display, and is to write other pixels during the lighting of one pixel among many pixels. In this way, the actual driving frequency can be reduced, thereby reducing power consumption.
The second article is about the publication of organic EL panel drive technology capable of switching between 2D and 3D display (Paper No. 21.2). In 2D display, turn on the lights in order to reduce power consumption as much as possible. In 3D display, turn on the lights together to achieve a good stereo image without crosstalk.
The third article is about the publication of a paper on the possibility of reducing the frequency while achieving 3D display (paper number 21.3). The advantages and disadvantages of various driving methods are compared, and the characteristics of various methods are mastered.
At the "OLED Displays I" conference, SMD released a panel for 3D display in the "white organic EL + color filter" mode (Paper No. 42.3). This paper was also selected as Distinguished Paper. The main point is to realize an ultra-thin panel with a thickness of only 1mm. This type of panel is realized by arranging the color filters in a horizontal stripe pattern and arranging a grid on the back of the color filter substrate so that the grid is located exactly at the center of each pixel. "The white organic EL + color filter method is also suitable for 3D display" is a very interesting trend.
As can be seen from these announcements, SMD sees 3D as an important market for organic EL. Using organic EL for active shutter mode 3D display basically does not produce crosstalk. Especially for organic EL, 3D TV will become a promising market, which can more clearly demonstrate the advantages of organic EL over liquid crystal panels than 2D displays. It seems that it is not too far away to put into production of 3D organic EL TV. (Special Contributor: Yoji Matsuo, Taiwan AU Optronics)
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