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US 2004/0070809 A1Published application
Self light emitting display device
AssigneeSeiko Instruments Inc.
InventorShigeru Senbonmatsu
Life of this patent
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Abstract
Provided is a technique for producing a double-sided display device using a self light emitting display element in which a thickness thereof is small, a contrast is high, and a privacy is kept. A first polarization layer and a second polarization layer are provided so as to sandwich the self light emitting display element and it is set such that the transmission axis of the first polarization layer and the transmission axis of the second polarization layer are orthogonal to each other.
Claims6
A self light emitting display device, comprising:
- a self light emitting element;
- and
- a first polarization layer and a second polarization layer which are provided to sandwich the self light emitting element,
- wherein a transmission axis of the first polarization layer is orthogonal to a transmission axis of the second polarization layer.
1 more element
A self light emitting display device, comprising:
- a self light emitting element;
- a first polarization layer and a second polarization layer which are provided to sandwich the self light emitting element;
- a first optical phase differential layer (retardation:
- Än1d1, where Än is optical anisotropy and d is a thickness) provided between the self light emitting element and the first polarization layer;
- and
- a second optical phase differential layer (retardation:
- Än2d2) provided between the self light emitting element and the second polarization layer,
- wherein a transmission axis of the first polarization layer is parallel to a transmission axis of the second polarization layer,
- a delay phase axis of the optical anisotropy of the first optical phase differential layer (Än1d1) is parallel to a delay phase axis of the optical anisotropy of the second optical phase differential layer (Än2d2) and an angle produced by the delay phase axis and the transmission axis of the first polarization layer is set to block external light, and
- values of Än1d1 and Än2d2 with respect to light having a wavelength ë of 400 nm to 700 nm satisfy:
- Än1d1/ë=0.25+m/2±0.05 (m=0, 1, 2, . . . );
- and Än2d2/ë=0.25+m/2±0.05 (m=0, 1, 2, . . . ).
9 more elements
Dependencies are inferred from the claim text.