# US 11,029,565 B2 · Display panel, display device, and method for manufacturing display panel

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- Number: US 11,029,565 B2
- Document ID: US11029565B2
- Status: Granted
- Kind: B2
- Application number: 16/642,503
- Filed: 2019-05-23
- Published: 2020-06-11
- Granted: 2021-06-08
- Earliest claimed: 2018-05-24
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.
- Inventors: Qian Jia; Jaegeon You; Xinxing Wang; Jikai Yao
- Web page: https://patentgrep.com/patent/US11029565B2

## CPC

- G02F 1/13363: Birefringent elements, e.g. for optical compensation
- G02F 1/133707: {Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes}
- G02F 1/133784: {by rubbing}
- G02F 1/133749: {for low pretilt angles, i.e. lower than 15 degrees}
- G02F 2201/123: pixel
- G02F 2413/02: Number of plates being 2
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A display panel, a display device, and a method for manufacturing a display panel are provided. The display panel includes first and second substrates, first and second alignment films and a liquid crystal layer extending along a first direction and a second direction and sequentially along a third direction perpendicular to the first direction and the second direction. The liquid crystal layer includes a column of liquid crystal molecules along the third direction, and includes a first liquid crystal molecule closest to the first alignment film and a second liquid crystal molecule closest to the second alignment film. The first liquid crystal molecule and the second liquid crystal molecule have different tilting tendencies with respect to the plane defined by the first direction and the second direction, and form a twist angle.

## Claims

### Claim 1

A display panel, comprising:
a first substrate, a first alignment film, a liquid crystal layer, a second alignment film and a second substrate extending along a first direction and a second direction and sequentially arranged along a third direction perpendicular to the first direction and the second direction,
wherein the liquid crystal layer comprises a column of liquid crystal molecules along the third direction, and the column of liquid crystal molecules comprises a first liquid crystal molecule closest to the first alignment film and a second liquid crystal molecule closest to the second alignment film,
wherein, on a plane defined by the first direction and the second direction, an orthographic projection of a long axis of the first liquid crystal molecule is at an acute angle to an orthographic projection of a long axis of the second liquid crystal molecule,
wherein, on a plane defined by an angular bisector of the acute angle and the third direction, an extension line of the orthographic projection of the long axis of the first liquid crystal molecule intersects with an extension line of the orthographic projection of the long axis of the second liquid crystal molecule to form an intersection point, and
wherein, on a line along the third direction, an orthographic projection of the intersection point is between the orthographic projection of the long axis of the first liquid crystal molecule and the orthographic projection of the long axis of the second liquid crystal molecule.

### Claim 2 (depends on 1)

The display panel of claim 1, wherein a sum of following items is 0°:
a degree of an angle formed by a line along the long axis of the first liquid crystal molecule and the plane defined by the first direction and the second direction, and
a degree of the acute angle.

### Claim 3 (depends on 2)

The display panel of claim 2, wherein an absolute value of the degree of the acute angle is less than or equal to 1.2°.

### Claim 4 (depends on 2)

The display panel of claim 2, wherein an absolute value of the degree of the angle formed by the line along the long axis of the first liquid crystal molecule and the plane defined by the first direction and the second direction is less than or equal to 2°.

### Claim 5 (depends on 1)

The display panel according to claim 1, further comprising at least one of a first compensation film at a side of the first substrate away from the liquid crystal layer or a second compensation film at a side of the second substrate away from the liquid crystal layer.

### Claim 6 (depends on 5)

The display panel of claim 5,
wherein the first compensation film comprises a +A uniaxial compensation film or a −A uniaxial compensation film, or
wherein the second compensation film comprises a +A uniaxial compensation film or a −A uniaxial compensation film.

### Claim 7 (depends on 6)

The display panel of claim 6,
wherein the column of liquid crystal molecules comprises a third liquid crystal molecule closest to a liquid crystal molecule of the +A uniaxial compensation film, and
wherein a direction of a long axis of the liquid crystal molecule of the +A uniaxial compensation film is perpendicular to a direction of a long axis of the third liquid crystal molecule.

### Claim 8 (depends on 6)

The display panel of claim 6,
wherein the column of liquid crystal molecules comprises a fourth liquid crystal molecule closest to a liquid crystal molecule of the −A uniaxial compensation film, and
wherein a direction of a long axis of the liquid crystal molecule of the −A uniaxial compensation film is a same direction of a long axis of the fourth liquid crystal molecule.

### Claim 9 (depends on 6)

The display panel of claim 6, wherein the at least one of a first compensation film at a side of the first substrate away from the liquid crystal layer or a second compensation film at a side of the second substrate away from the liquid crystal layer comprises both of the first compensation film and the second compensation film, and the first compensation film and the second compensation film are both +A uniaxial compensation films, or the first compensation film and the second compensation film are both −A uniaxial compensation films.

### Claim 10 (depends on 9)

The display panel of claim 9, wherein the first compensation film and the second compensation film have equal in-plane phase retardations for incident light with a same wavelength.

### Claim 11 (depends on 9)

The display panel of claim 9,
wherein the first compensation film and the second compensation film are both −A uniaxial compensation films, and
wherein a range of in-plane phase retardations of the first compensation film and the second compensation film for incident light with a wavelength of 550 nm is −65 nm to −70 nm.

### Claim 12 (depends on 9)

The display panel of claim 9,
wherein the first compensation film and the second compensation film are both +A uniaxial compensation films, and
wherein a range of in-plane phase retardations of the first compensation film and the second compensation film for incident light with a wavelength of 550 nm is 25 nm to 35 nm.

### Claim 13 (depends on 1)

The display panel of claim 1, wherein the display panel comprises an ADS mode liquid crystal display panel.

### Claim 14 (depends on 13)

The display panel of claim 13,
wherein the display panel comprises a rectangular pixel, and
wherein an extending direction of a slit pixel electrode of the rectangular pixel is same as an extending direction of a long side of the rectangular pixel.

### Claim 15 (depends on 1)

A display device, comprising the display panel according to claim 1.

### Claim 16

A method for manufacturing a display panel, comprising:
providing a first substrate and a second substrate extending along a first direction and a second direction;
forming a first alignment material film on the first substrate and forming a second alignment material film on the second substrate;
rubbing the first alignment material film and the second alignment material film along a same direction, so that the first alignment material film becomes a first alignment film and the second alignment material film becomes a second alignment film;
providing liquid crystal on the first alignment film or the second alignment film; and
bonding the first substrate and the second substrate, so that the first substrate, the first alignment film, a liquid crystal layer formed by the liquid crystal, the second alignment film and the second substrate are sequentially arranged along a third direction perpendicular to the first direction and the second direction,
wherein, the liquid crystal layer comprises a column of liquid crystal molecules along the third direction, and the column of liquid crystal molecules comprises a first liquid crystal molecule closest to the first alignment film and a second liquid crystal molecule closest to the second alignment film,
wherein, on a plane defined by the first direction and the second direction, an orthographic projection of a long axis of the first liquid crystal molecule is at an acute angle to an orthographic projection of a long axis of the second liquid crystal molecule,
wherein, on a plane defined by an angular bisector of the acute angle and the third direction, an extension line of the orthographic projection of the long axis of the first liquid crystal molecule intersects with an extension line of the orthographic projection of the long axis of the second liquid crystal molecule to form an intersection point, and
wherein, on a line along the third direction, an orthographic projection of the intersection point is between the orthographic projection of the long axis of the first liquid crystal molecule and the orthographic projection of the long axis of the second liquid crystal molecule.

### Claim 17 (depends on 16)

The method of claim 16, further comprising:
providing a first compensation film at a side of the first substrate away from the liquid crystal layer.

### Claim 18 (depends on 16)

The method of claim 16, further comprising:
providing a second compensation film at a side of the second substrate away from the liquid crystal layer.