# US 12,010,868 B2 · Display device and touch display device

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- Number: US 12,010,868 B2
- Document ID: US12010868B2
- Status: Granted
- Kind: B2
- Application number: 17/119,150
- Filed: 2020-12-11
- Published: 2021-07-01
- Granted: 2024-06-11
- Earliest claimed: 2019-12-30
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Keongjin Lee; Byungjoo Lee; Juhoon Jang; Ara Yoon; Woonchan Moon
- Web page: https://patentgrep.com/patent/US12010868B2

## CPC

- G06F 3/0443: {using a single layer of sensing electrodes}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/40: OLEDs integrated with touch screens
- H10K 59/873: {Encapsulations}
- H10K 59/879: {comprising refractive means, e.g. lenses}
- G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
- G06F 2203/04112: Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
- H10K 59/88: Dummy elements, i.e. elements having non-functional features
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display device includes a light emitting element layer, an intermediate layer disposed on the light emitting element layer, a lens layer having a convex shape and disposed on the intermediate layer to correspond to the light emitting element layer, and a lens protecting layer disposed on the intermediate layer and configured to cover the lens layer, wherein a total reflection of light output from a light emitting area of the light emitting element layer does not occur on an interface between the lens layer and the lens protecting layer.

## Claims

### Claim 1

A display device, comprising:
a base substrate comprising a display area and a non-display area;
a light emitting element layer disposed in the display area;
a lens layer having a convex shape and disposed to correspond to the light emitting element layer;
an intermediate layer including an encapsulation layer disposed between the light emitting element layer and the lens layer, the encapsulation layer including a first inorganic encapsulation film, a second inorganic encapsulation film and an organic encapsulation film disposed between the first inorganic encapsulation film and the second inorganic encapsulation film, and the intermediate layer further including an insulation layer disposed between the lens layer and the encapsulation layer;
a plurality of touch electrodes disposed on the insulation layer;
a lens protecting layer disposed on the intermediate layer and configured to cover the lens layer;
a first dam disposed in the non-display area and configured to surround the organic encapsulation film; and
a second dam disposed in the non-display area and configured to surround the lens protecting layer,
wherein a refractive index of the lens layer is higher than a refractive index of the organic encapsulation film in the encapsulation layer, and the refractive index of the organic encapsulation film is higher than a refractive index of the lens protecting layer,
wherein the refractive index of the lens layer is 1.8 and the refractive index of the lens protecting layer is 1.3,
wherein a bottom surface of the lens layer directly contacts an upper surface of the insulation layer, and a bottom surface of each of the plurality of touch electrodes directly contacts the upper surface of the insulation layer,
wherein a transistor is disposed below the light emitting element layer, and
wherein the first dam and the second dam are disposed in different layers so as to overlap each other in an upward and downward direction.

### Claim 2 (depends on 1)

The display device of claim 1, wherein a total reflection of light output from an edge point of a light emitting area does not occur on an interface between of the lens layer and the lens protecting layer.

### Claim 3 (depends on 1)

The display device of claim 1,
wherein a diameter (D) of the lens layer is larger than a length (a) of a light emitting area.

### Claim 4 (depends on 1)

The display device of claim 1, wherein light output from a light emitting area is primarily refracted on an interface between the intermediate layer and the lens layer, and the primarily refracted light is secondarily refracted on an interface between the lens layer and the lens protecting layer,
an incident angle of the primarily refracted light on the interface between the lens layer and the lens protecting layer is θi, and
in the case of
θ
i
<
sin
-
1
(
n
2
n
1
)
,
total reflection does not occur, where n1 is a refractive index of the lens layer, n2 is a refractive index of the lens protecting layer, and n1>n2,
wherein n2/n1 is less than or equal to 1.

### Claim 5 (depends on 4)

The display device of claim 4, wherein with respect to a coordinate po(0, 0) of an origin point of the lens layer, a coordinate of an edge point of the light emitting area is pp(xp, yp),
a coordinate of a point, where light output from the coordinate pp(xp, yp) is primarily refracted on the interface between the intermediate layer and the lens layer, is pg(xg, yg), and
a coordinate of a point, where the primarily refracted light is secondarily refracted on the interface between the lens layer and the lens protecting layer, is pl (xl, yl), and
wherein an equation
x
p
=
a
2
is satisfied, an equation yp=yl−b is satisfied, an equation
x
g
=
y
g
-
(
y
p
-
x
p
⁢
tan
⁡
(
9
⁢
0
-
θ
p
)
tan
⁡
(
9
⁢
0
-
θ
p
)
is satisfied, an equation yg=yp+b is satisfied, an equation xl=√{square root over (2RS−S2)} is satisfied, and an equation yl=R−S is satisfied,
where θp denotes an incident angle of light output from the coordinate pp(xp, yp) on the interface between the intermediate layer and the lens layer, a denotes a length of the light emitting area, R denotes a radius of curvature of the lens layer, S denotes a height of the lens layer, and b denotes a height of the intermediate layer.

### Claim 6 (depends on 5)

The display device of claim 5, wherein a coordinate of a point, where a virtual extension line of the primarily refracted light meets a lower interface of the intermediate layer, is p′g(x′p, y′p),
an equation θi=θn−θ′p is satisfied,
an equation θn=tan−1(xl/yl) is satisfied,
an equation θ′p=tan−1((xl−x′p)/(yl−y′p)) is satisfied,
an equation
x
p
′
=
(
n
g
n
1
)
2
⁢
(
(
x
p
-
x
g
)
2
+
b
2
)
-
b
2
+
x
g
is satisfied, and
an equation y′p=yp is satisfied.

### Claim 7 (depends on 6)

The display device of claim 6, wherein a refractive angle of the secondarily refracted light on the interface between the lens layer and the lens protecting layer is expressed as an equation
θ
t
=
sin
-
1
(
n
1
n
2
⁢
sin
⁢
θ
i
)
,
where n1/n2 sin θi is smaller than or equal to 1.

### Claim 8

A touch display device, comprising:
a base substrate comprising a display area and a non-display area;
a plurality of light emitting element layers disposed in the display area;
a plurality of lens layers disposed over the plurality of light emitting element layers;
an intermediate layer disposed to cover the plurality of light emitting element layers, the intermediate layer including an encapsulation layer disposed between the plurality of the light emitting element layers and the plurality of lens layers, the encapsulation layer including a first inorganic encapsulation film, a second inorganic encapsulation film and an organic encapsulation film disposed between the first inorganic encapsulation film and the second inorganic encapsulation film, and the intermediate layer further including an insulation layer disposed on the encapsulation layer;
a plurality of touch electrodes having a mesh shape and disposed on the insulation layer of the intermediate layer,
the plurality of lens layers having a convex shape and disposed inside the plurality of touch electrodes while being disposed on the intermediate layer;
a lens protecting layer disposed on the intermediate layer and configured to cover one lens layer of the plurality of lens layers;
a first dam disposed in the non-display area and configured to surround the organic encapsulation film; and
a second dam disposed in the non-display area and configured to surround the lens protecting layer,
wherein a refractive index of the plurality of lens layers is higher than a refractive index of the organic encapsulation film in the encapsulation layer, and the refractive index of the organic encapsulation film is higher than a refractive index of the lens protecting layer,
wherein the refractive index of the lens layer is 1.8 and the refractive index of the lens protecting layer is 1.3,
wherein a transistor is disposed below the plurality of light emitting element layers, and
wherein the first dam and the second dam are disposed in different layers so as to overlap each other in an upward and downward direction.

### Claim 9 (depends on 8)

The touch display device of claim 8, wherein a total reflection of light output from an edge point of a light emitting area does not occur on the interface between the one lens layer and the lens protecting layer.

### Claim 10 (depends on 8)

The touch display device of claim 8, wherein one of the plurality of light emitting element layers is disposed inside one of the plurality of lens layers, and
a diameter (D) of the one lens layer is larger than a length (a) of a light emitting area.

### Claim 11 (depends on 8)

The touch display device of claim 8, wherein light output from a light emitting area is primarily refracted on an interface between the intermediate layer and the one lens layer, and the primarily refracted light is secondarily refracted on an interface between the one lens layer and the lens protecting layer,
an incident angle of the primarily refracted light on the interface between the one lens layer and the lens protecting layer is θi, and
in the case of
θ
i
<
sin
-
1
(
n
2
n
1
)
,
total reflection does not occur, where n1 is a refractive index of the lens layer, and n2 is a refractive index of the lens protecting layer,
wherein n2/n1 is less than or equal to 1.

### Claim 12 (depends on 8)

The touch display device of claim 8, wherein the touch display device further comprises a bank layer having a plurality of openings and disposed below the intermediate layer, and
the plurality of touch electrodes are disposed to correspond to the bank layer.

### Claim 13 (depends on 8)

The touch display device of claim 8, wherein the one lens layer comprises polytriazine or a material where one or more of titanium dioxide (TiO2), Zirconium dioxide (ZrO2) and a nano filler is added to polytriazine.

### Claim 14 (depends on 8)

The touch display device of claim 8, wherein the lens protecting layer comprises a material in which a hydroxyl group (—OH group) or a fluorine group (—F group) is added to a substituent of an epoxy resin or an acryl resin, or a material in which a nano-sized hollow silica is added to an epoxy resin or an acryl resin.

### Claim 15 (depends on 8)

The touch display device of claim 8, wherein the organic encapsulation film comprises an epoxy resin or an acryl resin.

### Claim 16 (depends on 8)

The touch display device of claim 8, wherein a touch pad is disposed in the non-display area,
a touch routing wire is disposed over the encapsulation layer along the encapsulation layer to electrically connect the touch pad and at least one of the plurality of touch electrodes, and
the touch routing wire is disposed between the first dam and the second dam.

### Claim 17

A touch display device, comprising:
a base substrate comprising a display area and a non-display area;
a plurality of light emitting element layers disposed in the display area;
a plurality of lens layers disposed over the plurality of light emitting element layers;
an intermediate layer disposed to cover the plurality of light emitting element layers, the intermediate layer including an encapsulation layer disposed between the plurality of light emitting element layers and the plurality of lens layers, the encapsulation layer including a first inorganic encapsulation film, a second inorganic encapsulation film and an organic encapsulation film disposed between the first inorganic encapsulation film and the second inorganic encapsulation film, and the intermediate layer further including an insulation layer disposed between the lens layer and the encapsulation layer;
a plurality of touch electrodes having a mesh shape and the plurality of lens layers each having a convex shape, both of the plurality of touch electrodes and the plurality of lens layers being directly disposed on a same surface of the insulation layer;
a lens protecting layer disposed on the insulation layer and covering one lens layer of the plurality of lens layers;
a first dam disposed in the non-display area and configured to surround the organic encapsulation film; and
a second dam disposed in the non-display area and configured to surround the lens protecting layer,
wherein a total reflection of light output from a light emitting area of one light emitting element layer of the plurality of light emitting element layers does not occur on an interface between the one lens layer and the lens protecting layer,
wherein a refractive index of the lens layer is higher than a refractive index of the organic encapsulation film in the encapsulation layer, and the refractive index of the organic encapsulation film is higher than a refractive index of the lens protecting layer,
wherein the refractive index of the lens layer is 1.8 and the refractive index of the lens protecting layer is 1.3,
wherein a transistor is disposed below the plurality of light emitting element layers, and
wherein the first dam and the second dam are disposed in different layers so as to overlap each other in an upward and downward direction.