# US 2014/0153213 A1 · Display device

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- Number: US 2014/0153213 A1
- Document ID: US20140153213A1
- Status: Published application
- Kind: A1
- Application number: 14/011,955
- Filed: 2013-08-28
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Joon Hak OH; Ha-Yun KANG; Jong Seo LEE
- Web page: https://patentgrep.com/patent/US20140153213A1

## CPC

- G02B 5/30: Polarising elements (light-modulating devices with active elements G02F1/00)
- F21V 7/00: Reflectors for light sources (characterised by cooling arrangements F21V29/505)
- G02F 1/13338: {Input devices, e.g. touch panels}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/043: using propagating acoustic waves
- G02F 1/133394: {Piezoelectric elements associated with the cells}
- G02F 1/133605: {including specially adapted reflectors}
- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- H04R 5/02: Spatial or constructional arrangements of loudspeakers
- H04R 17/00: Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00})
- H04R 2499/11: Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
- H04R 2499/15: Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- 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
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)

## Abstract

A display device includes: a display panel assembly; and a backlight unit. The backlight unit includes an optical sheet, a reflective sheet and a light source. One of the optical sheet and the reflective sheet includes a material which supplies a sound by receiving an electrical field.

## Claims

### Claim 1

A display device, comprising:
a display panel assembly; and
a backlight unit comprising an optical sheet, a reflective sheet and a light source,
wherein one of the optical sheet and the reflective sheet comprises a material which supplies a sound by receiving an electrical field.

### Claim 2 (depends on 1)

The display device of claim 1, wherein:
the material which supplies the sound by receiving the electrical field comprises lead zirconium titanate, polyvinylidene fluoride, polyvinylidene fluoride trifluoroethylene, or a combination thereof.

### Claim 3 (depends on 1)

The display device of claim 1, wherein:
the one of the optical sheet and the reflective sheet comprises
a vibration material layer comprising the material which supplies the sound by receiving the electrical field; and
a sound element comprising a pair of electrodes respectively on upper and lower sides of the vibration material layer.

### Claim 4 (depends on 3)

The display device of claim 3, wherein:
the optical sheet comprises the material which supplies the sound by receiving the electrical field, and
the optical sheet further comprises a diffusion layer on an outer surface of an electrode of the pair of electrodes.

### Claim 5 (depends on 3)

The display device of claim 3, wherein:
the reflective sheet comprises the material which supplies the sound by receiving the electrical field, and further comprises a reflective layer on an outer surface of an electrode of the pair of electrodes.

### Claim 6 (depends on 3)

The display device of claim 3, wherein:
the vibration material layer is a film.

### Claim 7 (depends on 3)

The display device of claim 3, wherein:
the vibration material layer is in only a partial area of the one of the optical sheet and the reflective sheet.

### Claim 8 (depends on 7)

The display device of claim 7, wherein the one of the optical sheet and the reflective sheet further comprises a pair of sound elements.

### Claim 9 (depends on 3)

The display device of claim 3, further comprising a spacer between the sound element and a component of the display device,
wherein a space in which the sound element vibrates is defined between the sound element and the component of the display device.

### Claim 10 (depends on 3)

The display device of claim 3, further comprising:
a top chassis, a mold frame and a bottom chassis which fix the display panel assembly and the backlight unit in the display device.

### Claim 11 (depends on 3)

The display device of claim 3, wherein:
the vibration material layer generates vibration of frequencies outside an audible frequency, and
a haptic function of the display device uses a change in the frequencies outside the audible frequency to detect a touch.

### Claim 12 (depends on 1)

The display device of claim 1, further comprising:
a window on a display side of the display panel assembly.

### Claim 13 (depends on 12)

The display device of claim 12, further comprising:
a receiver on an inner side of the window and configured to transfer a voice.

### Claim 14 (depends on 13)

The display device of claim 13, wherein:
the receiver comprises:
a vibration material layer comprising the material which supplies the sound by receiving the electrical field; and
a pair of electrodes.

### Claim 15 (depends on 14)

The display device of claim 14, wherein:
the vibration material layer comprises lead zirconium titanate, polyvinylidene fluoride, polyvinylidene fluoride trifluoroethylene, or a combination thereof.

### Claim 16 (depends on 13)

The display device of claim 13, wherein:
the window overlaps the receiver.

### Claim 17

A display device, comprising:
a display panel assembly; and
a polarization sheet on a display side of the display panel assembly,
wherein the polarization sheet comprises:
a vibration material layer comprising a material which supplies a sound by receiving an electrical field; and
a sound element comprising a pair of electrodes respectively on upper and lower sides of the vibration material layer.

### Claim 18 (depends on 17)

The display device of claim 17, wherein:
the display panel assembly is an organic light emitting panel.

### Claim 19 (depends on 17)

The display device of claim 17, further comprising:
a window positioned on display sides of the display panel assembly and the polarization sheet.

### Claim 20 (depends on 19)

The display device of claim 19, further comprising:
a receiver on an inner side of the window and configured to transfer a voice.

### Claim 21 (depends on 20)

The display device of claim 20, wherein:
the receiver comprises the vibration material layer and the pair of electrodes.

### Claim 22 (depends on 21)

The display device of claim 21, wherein:
the vibration material layer comprises lead zirconium titanate, polyvinylidene fluoride, polyvinylidene fluoride trifluoroethylene, or a combination thereof.

### Claim 23 (depends on 20)

The display device of claim 20, wherein:
the window overlaps the receiver.

### Claim 24 (depends on 19)

The display device of claim 19, further comprising:
an adhesive layer between the polarization sheet and the window.

### Claim 25 (depends on 19)

The display device of claim 19, further comprising:
a cushion layer on a rear side of the display panel assembly.