# US 11,307,337 B2 · Display device and method for manufacturing display device

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- Number: US 11,307,337 B2
- Document ID: US11307337B2
- Status: Granted
- Kind: B2
- Application number: 16/499,238
- Filed: 2018-03-23
- Published: 2021-04-15
- Granted: 2022-04-19
- Earliest claimed: 2017-03-30
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Akira Sakai; Masahiro Hasegawa; Atsushi Ban; Koji Murata; Yuichi Kawahira; Kiyoshi Minoura; Takako Koide; Kozo Nakamura
- Web page: https://patentgrep.com/patent/US11307337B2

## CPC

- G02F 1/1335: Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02B 5/3016: {involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528)}
- G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)}
- G02F 1/133541: {Circular polarisers}
- G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- 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)
- H05B 33/02: Details
- H05B 33/10: Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
- H10K 59/40: OLEDs integrated with touch screens
- H10K 59/879: {comprising refractive means, e.g. lenses}
- B29D 11/00644: {polarizing}
- B29D 11/0073: {Optical laminates}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)

## Abstract

The present invention provides: (I) a display device including a display panel, a retardation layer, and a polarizer which are stacked in the stated order from a back surface side to a viewing surface side and integrated without an adhesive layer; and (II) a method for producing a display device including: forming a first alignment film on a display panel, applying a solution containing first polymerizable liquid crystal to the first alignment film, and curing the first polymerizable liquid crystal to produce a retardation layer; and forming a second alignment film on the retardation layer, applying a solution containing second polymerizable liquid crystal and a dichroic material to the second alignment film, and curing the second polymerizable liquid crystal to produce a polarizer.

## Claims

### Claim 1

A foldable display device comprising:
a display panel,
a retardation layer, and
a polarizer, wherein
the display panel includes a sealing film,
the retardation layer includes a first alignment film on the sealing film, and a first cured product of a first polymerizable liquid crystal on the first alignment film,
the polarizer includes a second alignment film on the first cured product, and a second cured product of a second polymerizable liquid crystal on the second alignment film,
the second polymerizable liquid crystal contains a polarizing dichroic material, and
the display panel, the retardation layer, and the polarizer are integrated without an adhesive layer.

### Claim 2 (depends on 1)

The foldable display device according to claim 1, wherein a combination of the retardation layer and the polarizer functions as a circularly polarizing plate.

### Claim 3 (depends on 1)

The foldable display device according to claim 1, wherein the display panel is an organic electroluminescent panel.

### Claim 4 (depends on 1)

The foldable display device according to claim 1, wherein the display panel is a liquid crystal panel.

### Claim 5 (depends on 1)

The foldable display device according to claim 1, wherein the foldable display device further includes a touch screen sensor disposed closer to a back surface of the foldable display device than the retardation layer.

### Claim 6 (depends on 1)

The foldable display device according to claim 1, wherein an alignment azimuth of the retardation layer is substantially orthogonal to an alignment treatment azimuth of the polarizer.

### Claim 7 (depends on 1)

The foldable display device according to claim 1, wherein an alignment azimuth of the retardation layer forms an angle of about 45 degrees with an alignment azimuth of the polarizer.

### Claim 8 (depends on 1)

The foldable display device according to claim 1, further comprising a positive C plate arranged on the display panel.

### Claim 9 (depends on 8)

The foldable display device according to claim 8, wherein the positive C plate includes a vertical alignment film and a layer made of a polymerizable liquid crystal.

### Claim 10 (depends on 1)

The foldable display device according to claim 1, wherein the retardation layer is a λ/4 plate.

### Claim 11 (depends on 1)

The foldable display device according to claim 1, wherein a laminate of the retardation layer and the polarizer is a circularly polarizing plate having a thickness of 9 μm or less.

### Claim 12 (depends on 1)

The foldable display device according to claim 1, further comprising a folded portion along a line connecting between center points of longer sides of the display panel.

### Claim 13 (depends on 1)

The foldable display device according to claim 1, wherein the display panel includes a support substrate of a polyimide film.

### Claim 14

A method for producing a display device comprising:
forming a first alignment film on a liquid crystal panel or a sealing film of a display panel, applying a solution containing first polymerizable liquid crystal to the first alignment film, and curing the first polymerizable liquid crystal to produce a retardation layer; and
forming a second alignment film on the retardation layer, applying a solution containing second polymerizable liquid crystal and a dichroic material to the second alignment film, and curing the second polymerizable liquid crystal to produce a polarizer.