Organic EL display
An organic EL display having a polarizing plate is disclosed. The present invention includes an organic EL display panel, a first polarizing plate on the panel to convert a circularly or linearly polarized light to a linearly or circularly polarized light, and a second polarizing plate on the first polarizing plate to have a polarization characteristic of absorbing light in a high light efficiency wavelength range more than light in a low light efficiency wavelength range.
1. An organic EL display comprising:
an organic EL display panel to have a metal electrode;
a first polarizing plate on the organic EL display panel; and
a second polarizing plate on the first polarizing plate to have a polarization characteristic of absorbing light in a high light efficiency wavelength range more than light in a low light efficiency wavelength range,
wherein the first polarizing plate is converting a linearly polarized light into a circularly polarized or converting a circularly polarized light into a linearly polarized light and
wherein polarization efficiency and transmittance of the second polarizing plate are differently set per a red wavelength, a green wavelength and a blue wavelength, respectively and the second polarizing plate has high transmittance and low polarization efficiency in a blue wavelength rather than the green and red wavelengths.
2. The organic EL display of claim 1 , wherein the first polarizing plate is a λ/4 retarder.
3. The organic EL display of claim 1 , wherein the second polarizing plate is a dichroic dye based polarizing plate fabricated by aligning dichroic dye in one direction by extension wherein the dichroic dye has a light absorption characteristic differing according to a light wavelength and a polarized direction.
4. The organic EL display of claim 1 , wherein a maximum value of polarization efficiency of the second polarizing plate is tuned to a wavelength corresponding to a maximum value of a visual curve.
5. The organic EL display of claim 1 , wherein a maximum value of polarization efficiency of the second polarizing plate is tuned to a wavelength corresponding to a maximum value of an external light.
6. An organic EL display comprising:
a substrate;
an anode on one surface of the substrate;
an organic EL layer on the anode;
a metal cathode on the organic EL layer;
a λ/4 retarder on the other surface of the substrate; and
a dichroic dye based polarizing plate on the λ/4 retarder to have a polarization characteristic of absorbing light in a high light efficiency wavelength range more than light in a low light efficiency wavelength range, wherein the dichrioc dye based polarizing plate is fabricated by aligning dichrioc dye in one direction by extension,
wherein the λ/4 retarder is converting a linearly polarized light from the dichroic dye based polarizing plate into a circularly polarized light to the substrate and converting a circularly polarized light from the substrate into a linearly polarized light to the dichroic dye based polarizing plate and
wherein the dichroic dye based polarizing plate has high transmittance and low polarization efficiency in a blue wavelength rather than the red and green wavelengths.
7. The organic EL display of claim 6 , wherein the dichroic dye has a light absorption characteristic differing according to a light wavelength and a polarized direction.
8. The organic EL display of claim 6 , wherein a maximum value of polarization efficiency of the dichroic dye based polarizing plate is tuned to a wavelength corresponding to a maximum value of a visual curve.
9. An organic EL display comprising:
an organic EL display panel to have a metal electrode;
a first polarizing plate on the organic EL display panel; and
a second polarizing plate on the first polarizing plate to have a polarization characteristic of absorbing light in a high light efficiency wavelength range more than light in a low light efficiency wavelength range,
wherein the first polarizing plate is converting a linearly polarized light into a circularly polarized or converting a circularly polarized light into a linearly polarized light and
wherein the second polarizing plate has high transmittance and low polarization efficiency in blue and red wavelengths rather than a green wavelength.