OLED technology will gradually solve the disadvantages of uneven brightness

Although OLED panels have many advantages, it cannot be denied that OLEDs still have some shortcomings to be solved. The first is the cost issue, which is why OLED has only made achievements in the small electronic device market such as mobile phones and digital media players. However, it has not been widely used in the large-screen market such as TV.

However, with the gradual expansion of the market, there are currently Samsung, AUO, Sony, LG, Panasonic giants and upstream material manufacturers to invest in the development and production of OLED technology, OLED panel yields continue to increase, production costs are gradually reduced, OLED panels will increase in volume in the next three to five years and gradually replace the current PDP and LCD panels.

It is understood that Samsung's 3.5-generation OLED production line production of 14-inch panel yield has reached more than 90%, Samsung SMD's latest generation of 5.5-generation AMOLED production line has begun mass production, the use of glass substrate area three times larger than in previous times. Market research firm IHS iSuppli pointed out that the current cost of AMOLED panels is 30-60% higher than that of LTPS LCD panels. The industry’s first 5.5-generation production line owned by Samsung in the future will bring the cost gap between the two closer.

In the case of large-size OLEDs, Prof. Kasumi Suga of the University of Tokyo has teamed up with Japanese companies to develop new technologies that can be used to produce organic EL (OLED) panels and plans to put them into practical use within three years. Through this new technology, they can be easily produced. Large size OLED panel that can be used for TV. In this technique, argon ions (argon ion) or other particles are used to flatten the glass plate and other ceramic surfaces without deformation, and the glass plate can be sealed at room temperature without gaps.

In addition to the cost problem, brightness unevenness is also a drawback of the OLED panel. The reason for the uneven brightness of the OLED panel is the parasitic capacitance generated between the gate electrode and the source-drain electrode of the TFT. Since the size of the parasitic capacitance varies with the position on the screen, unevenness in brightness occurs. This phenomenon is particularly noticeable at low gray levels. If the parasitic capacitance of the TFT can be sufficiently reduced, the problem of uneven brightness can be solved.

At the Display Society (SID2011) held recently, Sony demonstrated the new structure of the new OLED panel, successfully solved the problem of uneven brightness. Sony changed the previous bottom-gate structure to a self-aligned top-gate structure. Since the distance between the gate electrode and the source-drain electrode in the self-aligned top-gate structure becomes, the parasitic capacitance can be sufficiently reduced to solve the uneven brightness.

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