Discussion in 'Free Thoughts' started by ajanta, Dec 25, 2016.

  1. ajanta Registered Senior Member

    I don't know the update or I'm really confused about the current lifetime of blue oled. But personally I thought about vertical or stacked pixels and its possible problems. I'm really happy now for found about it and here it is....

    "The development of vertical or stacked pixels"

    One facet of all the previous technologies lies in their horizontal arrangement of individual R, G, and B pixels (or sub-pixels). To attain the goal of cramming more pixels into the same amount of physical area, requires moving to some vertical arrangement where the individual RGB elements are stacked on top of one another.

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    One key to making the vertical pixel rely's on the fact that photons of different energy (e.g. wavelength, color) can penetrate silicon to different levels of depth. Photons with the shortest wavelength have the shortest penetration lengths (due to more interactions with the atoms). So in principle, one can make this kind of pixel device:

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    The layers are positioned to take advantage of the fact that silicon absorbs different wavelengths of light to different depths. The bottom layer records red, the middle layer records green, and the top layer records blue. Each stack of pixels directly records all of the light at each point in the image.

    Until recently, this scheme was difficult to engineer on a commercial scale due to various processing problems and the need for the thicknesses of the respective silicon layers to be very precise. This limitations are now over come.

    Problems with OLED:

    Lifetime - While red and green OLED films have longer lifetimes (46,000 to 230,000 hours), blue organics currently have much shorter lifetimes (up to around 14,000 hours). That's less than 2 years of continuous use.


    And now I think if vertical or stacked pixels have minimum 2 blue layers then it can extend the lifespan of oled screen than before because when a blue layer gonna end its lifetime then another layer can extend the lifespan of oled screen .

    So I'm waiting for your thought, thanks.
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  3. ajanta Registered Senior Member

    The basic process works like this:

    1. A voltage is applied across the OLED
    2. Electrical current flows from the cathode to the anode through the organic layers. The cathode injects electrons to the emissive layer; the anode injects holes into the conductive layer
    3. At the boundary between the emissive and conductive layers, the electrons recombine with the holes and transition down atomic energy levels.
    4. The OLED emits light
    5. The color of the emitted light depends on the type of organic molecule in the emissive layer. Different molecules within the layer can give different colors and hence a vertically stacked arrangement of RGB can occur.
    6. The intensity of the light is proportional to the amount of supplied current, so, like an LCD, intensity per pixel can be controlled.
    About light transparent OLED...
    This kind of technic can give better pixel density and now I think if flowing electric current controlled through 2 blue layers together and to fixed the intensity of blue light output then it will warm up less then before and can extend the display lifespan.
    Last edited: Dec 25, 2016
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