ORGANIC ELECTROLUMINESCENCE DISPLAY DEVICE

• US 20180159085A1
• Filed: 11/28/2017
• Published: 06/07/2018
• Est. Priority Date: 05/29/2015
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: YOSHIDA, Shinpei
• Granted Patent: US 10,497,905 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: G02B 5/3025 Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state G02B5/3008, G02B5/3016 take precedence
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G09F 9/00 Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00
• CPC Class Codes: G09F 9/30 in which the desired character or characters are formed by combining individual elements panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00
• CPC Class Codes: H05B 33/02 Details
• CPC Class Codes: H05B 33/04 Sealing arrangements , e.g. against humidity
• CPC Class Codes: H10K 50/00 Organic light-emitting devices integrated devices or assemblies of multiple devices H10K59/00, H10K65/00; organic semiconductor lasers H01S5/36
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/8731 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light

Abstract

An organic electroluminescence display device includes, from a visible side, at least: a circular polarization plate; and an organic electroluminescence display element having a pair of electrodes and an organic light emitting layer sandwiched therebetween. A high refractive index layer has a refractive index of greater than 1.7 and less than 2.1 is disposed between the plate and one of the electrodes on the visible side, the plate has a polarizer, a λ/2 plate, and a λ/4 plate in this order from the visible side, a retardation RthA (550) of the λ/2 plate in a thickness direction at a wavelength of 550 nm is within a range of greater than −120 nm and less than −40 nm, and a retardation RthB (550) of the λ/4 plate in a thickness direction at a wavelength of 550 nm is within a range of greater than −60 nm and less than 20 nm.

Claims

1. An organic electroluminescence display device comprising, from a visible side, at least:

a circular polarization plate; and

an organic electroluminescence display element having a pair of electrodes and an organic light emitting layer sandwiched therebetween,

wherein a high refractive index layer having a refractive index of greater than 1.7 and less than 2.1 is disposed between the circular polarization plate and one of the pair of electrodes, which is positioned on the visible side,

wherein the circular polarization plate has a polarizer, a λ

/2 plate, and a λ

/4 plate in this order from the visible side,

wherein a retardation RthA (550) of the λ

/2 plate in a thickness direction at a wavelength of 550 nm is within a range of greater than −

120 nm and less than −

40 nm, and

wherein a retardation RthB (550) of the λ

/4 plate in a thickness direction at a wavelength of 550 nm is within a range of greater than −

60 nm and less than 20 nm.

2. The organic electroluminescence display device according to claim 1,

wherein the retardation RthA (550) is within a range of greater than −

120 nm and less than or equal to −

90 nm.

3. The organic electroluminescence display device according to claim 1,

wherein the λ

/2 plate and the λ

/4 plate satisfy Requirement 1 or 2 described below.

Requirement 1;

not to include an optically anisotropic layer formed of a polymer film

Requirement 2;

to include an optically anisotropic layer of which a retardation RthC (550) in a thickness direction at a wavelength of 550 nm indicates 0 to 20 nm and which is formed of a polymer film

4. The organic electroluminescence display device according to claim 1, further comprising:

a touch panel between the circular polarization plate and the organic electroluminescence display element,

wherein the touch panel includes the high refractive index layer.

5. The organic electroluminescence display device according to claim 4,

wherein the high refractive index layer constitutes a transparent electrode layer of the touch panel.

6. The organic electroluminescence display device according to claim 1, further comprising:

a gas barrier layer between the circular polarization plate and the organic electroluminescence display element,

wherein the gas barrier layer includes the high refractive index layer.

7. The organic electroluminescence display device according to claim 2,

wherein the λ

/2 plate and the λ

/4 plate satisfy Requirement 1 or 2 described below.

Requirement 1;

not to include an optically anisotropic layer formed of a polymer film

Requirement 2;

to include an optically anisotropic layer of which a retardation RthC (550) in a thickness direction at a wavelength of 550 nm indicates 0 to 20 nm and which is formed of a polymer film

8. The organic electroluminescence display device according to claim 2, further comprising:

a touch panel between the circular polarization plate and the organic electroluminescence display element,

wherein the touch panel includes the high refractive index layer.

9. The organic electroluminescence display device according to claim 3, further comprising:

a touch panel between the circular polarization plate and the organic electroluminescence display element,

wherein the touch panel includes the high refractive index layer.

10. The organic electroluminescence display device according to claim 8,

wherein the high refractive index layer constitutes a transparent electrode layer of the touch panel.

11. The organic electroluminescence display device according to claim 9,

wherein the high refractive index layer constitutes a transparent electrode layer of the touch panel.

12. The organic electroluminescence display device according to claim 2, further comprising:

a gas barrier layer between the circular polarization plate and the organic electroluminescence display element,

wherein the gas barrier layer includes the high refractive index layer.

13. The organic electroluminescence display device according to claim 3, further comprising:

a gas barrier layer between the circular polarization plate and the organic electroluminescence display element,

wherein the gas barrier layer includes the high refractive index layer.