Pixel unit structure of self-illumination display with low-reflection
A self-illumination display is provided, including a first substrate, a light-absorbing structure, a filter layer, a driving circuit unit, and a self-illumination unit. The light-absorbing structure and the filter layer are juxtaposedly disposed over the first substrate. The driving circuit unit is disposed over and shielded by the light-absorbing structure. The self-illumination unit is disposed over the filter layer, including a light-transmissible electrode, a light emitting layer, and a black electrode. The self-illumination unit is disposed over the filter layer, including a light-transmissible electrode, a light emitting layer, and a black electrode. The light-transmissible electrode is disposed over the filter layer while the light emitting layer and the black electrode are sequentially tiered on the light-transmissible electrode. The light-absorbing structure, the filter layer and the black electrode together reduce the reflection of the ambient light and enhance the image contrast.
1. A pixel unit structure of an organic light emitting diode (OLED) display, comprising:
a first substrate;
a light-absorbing structure formed over the first substrate;
a filter layer disposed over the first substrate and being close to the light-absorbing structure;
a second substrate opposite to the first substrate;
a thin-film-transistor (TFT) disposed on the second substrate, wherein the light-absorbing structure shelters a vertical projection of the thin-film-transistor on the first substrate; and
an organic light emitting diode, disposed corresponding to the filter layer, including:
a black electrode layer formed over the second substrate, wherein the black electrode is light absorbable;
a light emitting layer formed over the black electrode layer; and
a light-transmissible electrode layer formed over the light emitting layer, wherein the light-transmissible electrode layer is disposed between the light-absorbing structure and the thin-film-transistor.
2. The pixel unit structure of claim 1 , wherein the light-absorbing structure includes a dark matrix.
3. The pixel unit structure of claim 1 , wherein the filter layer includes a filter resister or a color filter.
4. The pixel unit structure of claim 1 , wherein the light-transmissible electrode layer includes Indium Tin Oxide (ITO).
5. The pixel unit structure of claim 1 , wherein the black electrode layer includes a titanium (Ti) electrode or a chromium (Cr) electrode.
6. The pixel unit structure of claim 1 , wherein the black electrode layer comprises:
a bottom metal electrode layer;
a middle metal electrode layer formed over the bottom metal electrode layer, wherein the middle metal electrode layer is light-transmissible; and
a top metal electrode layer formed over the middle metal electrode.
7. The pixel unit structure of claim 1 , wherein the light emitting layer includes a white illuminative material.
8. The pixel unit structure of claim 1 , wherein the black electrode layer is electrically connected to the TFT.
9. The pixel unit structure of claim 8 , wherein the black electrode layer is an anode layer.