Organic light emitting didode display device having light-absorbing layer
The present invention provides an organic light emitting diode display device, having a transparent substrate; a plurality of anodes on the transparent substrate; an organic functional layer on the transparent substrate, wherein the transparent substrate covers the anodes; a light-absorbing layer on the organic functional layer, wherein the light-absorbing layer is an organic material layer and the organic material layer is doped with at least a metal; and a plurality of cathodes on the light-absorbing layer. The light-absorbing layer of the present invention can effectively reduce the amount of the reflected light, thereby raising the contrast ratio and enhancing the recognition ability of the display device.
1. An organic light emitting diode display device, comprising:
a transparent substrate;
a plurality of anodes on said transparent substrate;
an organic functional layer on said transparent substrate, wherein said transparent substrate covers said anodes;
a light-absorbing layer on said organic functional layer, wherein said light-absorbing layer is an organic material layer and said organic material layer is doped with at least a metal; and
a plurality of cathodes on said light-absorbing layer.
2. The organic light emitting diode display device of claim 1 , wherein each of said anodes and said cathodes has a strip structure.
3. The organic light emitting diode display device of claim 2 , wherein the extension of said anodes is perpendicular to the extension of said cathodes.
4. The organic light emitting diode display device of claim 1 , wherein the material of said organic material layer includes Triazole, Oxadiazole (OXD), Triazine, and derivatives of Triazine.
5. The organic light emitting diode display device of claim 1 , wherein the material of said metal is selected from IA group metals, IIA group metals, and transition metals.
6. The organic light emitting diode display device of claim 5 , wherein the work function of said transition metal is less than 4.2 eV.
7. The organic light emitting diode display device of claim 5 , wherein the work function of said transition metal is substantially equal to 4.2 eV.
8. The organic light emitting diode display device of claim 1 , wherein the doping density of said metal is between 20% and 80%.
9. The organic light emitting diode display device of claim 1 , wherein said organic functional layer includes
a hole injecting layer on said anodes;
a hole transmitting layer on said hole injecting layer;
an organic light emitting layer on said hole transmitting layer;
an electron transmitting layer on said organic light emitting layer; and
an electron injecting layer on said electron transmitting layer.
10. A light-absorbing layer suitable for setting between an organic functional layer and a plurality of cathodes in an organic light emitting diode display device, wherein said light-absorbing layer includes:
an organic material layer; and
at least a metal, wherein said organic material layer is doped with said metal.
11. The light-absorbing layer of claim 10 , wherein the material of said organic material layer includes Triazole, Oxadiazole (OXD), Triazine, and derivatives of Triazine.
12. The light-absorbing layer of claim 10 , wherein the material of said metal is selected from IA group metals , IIA group metals, and transition metals having work function less than or equal to 4.2 eV.
13. The light-absorbing layer of claim 12 , wherein the work function of said transition metal is less than 4.2 eV.
14. The light-absorbing layer of claim 12 , wherein the work function of said transition metal is equal to 4.2 eV.
15. The light-absorbing layer of claim 10 , wherein the doping density of said metal is between 20% and 80%.
16. The organic light emitting diode display device of claim 1 , wherein the light-absorbing layer is used to increase a contrast ratio of the display device.
17. The light-absorbing layer of claim 10 , wherein the light-absorbing layer is used to increase a contrast ratio.