Technical advantages and disadvantages of OLED TVs

OLED stands for Organic Light Emitting Diode. The working principle of OLED is to add organic substances between two conductors, and then between the glass panel and the bottom plate. The current passes through the two conductors to make OLED emit three primary colors of light. OLED TV has many desirable advantages: self-luminous OLED can bring one thousandth of the response time of LCD TV, without tailing; it can emit purer and brighter light, and produce more significant dark background details; the solid-state structure has good earthquake resistance; it has a wide viewing angle of 178°; the contrast ratio is as high as 1 million:1; and it is more energy-saving and environmentally friendly. And because of the simple structure and no need for backlight, the thickness of OLED TV is only about 3mm, which is truly "thin as paper".

According to DisplaySearch data, global OLED panel shipments in 2009 reached $825 million, up 35% from 2008, and the vast majority of shipments were used in mobile phone screens. The growth rate of large-size OLED panels used in TVs is still disappointing.

Why is the development of OLED in the field of large-size TV so slow, given its many advantages? There must be two reasons, internal and external. The internal reason is that after years of technological development, the technical defects of OLED in the field of large-size TV are still difficult to overcome:

First of all, the OLED light-emitting material has very poor antioxidant ability after being powered on, and needs to be sealed with vacuum glass, thus requiring an LTPS TFT substrate. This also means that the cost of OLED applications in large-size areas will remain high.

Secondly, the yield rate of large-size OLED panels has not improved significantly, which has greatly increased the cost of the OLED product line and also made it impossible to increase production quickly.

Internal technical defects and cost disadvantages have become the fundamental reasons restricting the development of OLED, and have also made it difficult for external manufacturers to move forward.