Why does OLED die short?

Why does OLED die short?

  • 2020-10-20
  • Views:0

Why does OLED die short?

(Summary description)

  • Categories:NEWS
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  • 2020-10-20
  • Views:0

Because OLED requires R, G and B materials to be stimulated by electric current to actively emit light, and the three materials have different degrees of aging. After a period of time, the brightness of the fast-decaying materials will also decrease quickly, and the screen will produce partial color.
Reason is that technology cannot solve B material (even R materials) and longevity and stability of the problem, so "opportunistic" borrow accessible G material (because it is the most reliable and durable), and R and B material 2:1 to mix, G as the main pixel, pixels with larger current drive, produce higher brightness; The relative reduction of R and B pixels can indirectly avoid the problems of the life and stability of R and B materials.
And OLED R, G, B three materials of different wavelengths, put them together in the panel, if using the same luminous layer, G, B light-emitting layer, shorter wavelength for accommodating the longest wavelength R material, will cause the G, B light-emitting layer thickness is too big, lead to light waves in the mixing into numerous unnecessary "impurity composition", seriously affect the purity of the light, the color is difficult to improve precision.
In particular, material B, which has the shortest wavelength, contains the most "impurity elements" due to the excessively long emission layer, resulting in the worst purity and seriously affecting the light efficiency.
At this time, if Material B wants to reach the same brightness as material G and R, it must be driven by a larger current, and then it will lead to a rapid increase in heat and power consumption, thus falling into a vicious cycle. This is also one of the important reasons affecting the life and stability of Material B (in addition, material B itself is difficult to extract).
At present, major manufacturers' practice is to raise G saturation, which is the most sensitive of human eyes, so that the screen is inclined to "gorgeous", which can cover the problem of R and B purity. Although bright, gorgeous and pleasing to the eye, it brings about color deviation, low color range, shading and other problems (we always make fun of Samsung's "green screen" in the past.


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