# US 10,770,687 B2 · Light-emitting system

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- Number: US 10,770,687 B2
- Document ID: US10770687B2
- Status: Granted
- Kind: B2
- Application number: 16/315,552
- Filed: 2016-07-12
- Published: 2019-08-08
- Granted: 2020-09-08
- Earliest claimed: 2016-07-12
- Assignees: Pioneer Corporation
- Applicants: Pioneer Corporation
- Inventors: Hiroaki Kitahara
- Web page: https://patentgrep.com/patent/US10770687B2

## CPC

- H10K 59/876: {comprising a resonant cavity structure, e.g. Bragg reflector pair}
- H05B 33/02: Details
- H10K 50/125: specially adapted for multicolour light emission, e.g. for emitting white light
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/878: {comprising reflective means}
- B60R 11/0235: {of flat type, e.g. LCD}
- B60R 2011/0026: {Windows, e.g. windscreen}
- B60R 2011/0043: {for integrated articles, i.e. not substantially protruding from the surrounding parts}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR

## Abstract

A standard direction (S) is a horizontal direction (a direction along X direction in the drawing). A base material (200) is supported by a frame body (250) so that a second surface (204) of the base material (200) is oriented obliquely upward from the standard direction (S). Thereby, a reference direction (R) is oriented obliquely upward from the standard direction (S). Light from the light-emitting system (20) has standard chromaticity in the standard direction (S). In addition, the light from the light-emitting system (20) has first chromaticity and second chromaticity in a first side direction (S1) and a second side direction (S2), respectively, the first side direction (S1) and the second side direction (S2) being symmetric with respect to the standard direction (S). A difference between the first chromaticity and the standard chromaticity is smaller than a difference between the second chromaticity and the standard chromaticity.

## Claims

### Claim 1

A light-emitting system comprising:
a light-emitting unit comprising a resonator and an organic layer interposed in the resonator, the light-emitting unit inclined from a standard direction,
wherein a light distribution of light from the light-emitting unit has a higher luminous intensity in the standard direction compared to that in a reference direction along a width direction of any of the light-emitting unit, the resonator, or the organic layer,
wherein the light from the light-emitting unit comprises standard chromaticity in the standard direction, the light from the light-emitting unit further comprising first chromaticity and second chromaticity in a first side direction and a second side direction, respectively, the first side direction and the second side direction being symmetric with respect to the standard direction, and
wherein a difference between the first chromaticity and the reference chromaticity is smaller than a difference between the second chromaticity and the reference chromaticity.

### Claim 2 (depends on 1)

The light-emitting system according to claim 1,
wherein the first side direction is oriented obliquely upward from a horizontal direction, and the second side direction is oriented obliquely downward from the horizontal direction.

### Claim 3 (depends on 1)

The light-emitting system according to claim 1,
wherein the first side direction is oriented obliquely downward from a horizontal direction, and the second side direction is oriented obliquely upward from the horizontal direction.

### Claim 4 (depends on 1)

The light-emitting system according to claim 1,
wherein each of an angle formed between the first side direction and the standard direction and an angle formed between the second side direction and the standard direction is equal to or greater than 5 degrees and equal to or less than 15 degrees.

### Claim 5 (depends on 1)

The light-emitting system according to claim 1, further comprising a reflecting layer and a semi-transparent reflecting layer,
wherein the organic layer is between the reflecting layer and the semi-transparent reflecting layer, the organic layer comprising a light-emitting layer.

### Claim 6 (depends on 5)

The light-emitting system according to claim 5, further comprising k layers from a first layer to a k-th layer (k is an integer that is equal to or greater than 2) between the semi-transparent reflecting layer and the reflecting layer,
wherein a value ΔM defined by Formula (1) below is equal to or greater than m−1/8 and equal to or less than m+1/8 (m is an integer that is equal to or greater than 1):
[
Formula
⁢
⁢
1
]
⁢
Δ
⁢
⁢
M
=
2
λ
⁢
∑
i
=
1
k
⁢
d
i
⁢
n
i
2
-
n
0
2
⁢
sin
2
⁢
θ
0
+
1
2
⁢
π
⁢
(
ϕ
S
+
ϕ
R
)
(
1
)
λ: peak wavelength of light from the light-emitting unit
di: thickness of i-th layer (1≤i≤k)
ni: refractive index of i-th layer (1≤i≤k)
n0: refractive index of medium propagated by light from the light-emitting layer
θ0: angle of direction at which the light distribution has a maximum value
φs: phase shift amount of the semi-transparent reflecting layer
φR: phase shift amount of the reflecting layer.

### Claim 7 (depends on 6)

The light-emitting system according to claim 6,
wherein the light distribution has a higher luminous intensity in a second direction on an opposite side of the first direction from the reference direction compared to a luminous intensity in the reference direction.

### Claim 8 (depends on 1)

The light-emitting system according to claim 1, further comprising a plurality of the light-emitting units and a plurality of light-transmitting units,
wherein the plurality of light-emitting units comprise a first light-emitting unit and a second light-emitting unit that is adjacent to the first light-emitting unit, and
wherein the plurality of light-transmitting units comprise a first light-transmitting unit between the first light-emitting unit and the second light-emitting unit.

### Claim 9 (depends on 1)

The light-emitting system according to claim 1,
wherein the light-emitting unit is installed on a mobile object, and
wherein the light-emitting unit is located at a height of equal to or greater than 1 m and equal to or less than 1 m 20 cm from a road surface on which the mobile object travels.

### Claim 10 (depends on 1)

The light-emitting system according to claim 1,
wherein the standard direction is a horizontal direction.