# US 2017/0285255 A1 · Backlight device and display device equipped with the same

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- Number: US 2017/0285255 A1
- Document ID: US20170285255A1
- Status: Published application
- Kind: A1
- Application number: 15/478,612
- Filed: 2017-04-04
- Published: 2017-10-05
- Earliest claimed: 2016-04-05
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Yosuke Nakamori; Takafumi Suzuki
- Web page: https://patentgrep.com/patent/US20170285255A1

## CPC

- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide}
- G02B 6/0055: {Reflecting element, sheet or layer}
- G02B 6/0088: {of the light guide or other optical sheets in the package}
- G02F 1/133528: {Polarisers}
- G02F 1/134309: {characterised by their geometrical arrangement}
- 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

## Abstract

According to one embodiment, a backlight device includes a case, a light guide in the case, a first optical sheet on the light guide, a second optical sheet on the first optical sheet, a first adhesive provided between the case and at least one of the first optical sheet and the second optical sheet, to stick at least one of the optical sheets to the case, and a light source in the case, configured to radiate light to the light guide.

## Claims

### Claim 1

A backlight device comprising:
a case;
a light guide in the case;
a first optical sheet on the light guide;
a second optical sheet on the first optical sheet;
a first adhesive provided between the case and at least one of the first optical sheet and the second optical sheet, to stick at least one of the optical sheets to the case; and
a light source in the case, configured to emit light to the light guide.

### Claim 2 (depends on 1)

The backlight device of claim 1, wherein
the case comprises a support frame including a first surface and a second surface on a side opposite to the first surface, and a bottom plate covering the second surface side of the support frame,
the light guide is placed on the bottom plate,
the first adhesive is stuck on the first surface of the support frame, and
the first optical sheet includes a peripheral portion overlaid on the first surface and stuck on the first adhesive.

### Claim 3 (depends on 2)

The backlight device of claim 2, wherein
the first surface of the support frame is provided at a position lower than a light emission surface of the light guide in the case, and
the first adhesive is stuck on the first surface, and comprises a surface stuck on the first optical sheet and located in the same plane with the light emission surface of the light guide.

### Claim 4 (depends on 3)

The backlight device of claim 3, wherein
the first optical sheet includes a concave overlaid on the adhesive,
the second optical sheet includes a tab projecting from a side edge of the second optical sheet, and
the tab is stuck on the first adhesive through the concave.

### Claim 5 (depends on 4)

The backlight device of claim 4, further comprising:
a spacer provided between the tab and the first adhesive.

### Claim 6 (depends on 1)

The backlight device of claim 1, further comprising:
a second adhesive stuck on the peripheral portion of the first optical sheet,
wherein
the second optical sheet is disposed on the first optical sheet in a state in which a periphery of the second optical sheet is surrounded by the second adhesive, and the second adhesive and the second optical sheet are located in a same plane.

### Claim 7

A display device, comprising:
a display panel comprising a pair of substrates opposed to each other, a liquid crystal layer sealed between the pair of substrates, and a polarizer on an outer surface of each of the substrates;
a backlight device comprising a case, a light guide in the case, a first optical sheet on the light guide, a second optical sheet on the first optical sheet, and a light source in the case, configured to radiate light into the light guide; and
a panel-side adhesive provided between the case and the display panel,
the panel-side adhesive and the second optical sheet being arranged in a same plane and abutting on the polarizer of the display panel.

### Claim 8 (depends on 7)

The display device of claim 7, wherein
the panel-side adhesive is provided between the first optical sheet and the polarizer.

### Claim 9 (depends on 8)

The display device of claim 8, further comprising:
a casing-side adhesive provided between the case and the first optical sheet.

### Claim 10 (depends on 9)

The display device of claim 9, wherein
the case comprises a support frame including a first surface and a second surface on a side opposite to the first surface, and a bottom plate covering the second surface side of the support frame,
the light guide is placed on the bottom plate,
the casing-side adhesive is stuck on the first surface of the support frame, and
the first optical sheet includes a peripheral portion overlaid on the first surface and stuck on the panel-side adhesive.

### Claim 11 (depends on 10)

The display device of claim 10, wherein
the first surface of the support frame is provided at a position lower than a light emission surface of the light guide, and
the casing-side adhesive is stuck on the first surface and is arranged in a same plane as the light emission surface of the light guide.

### Claim 12 (depends on 11)

The display device of claim 11, wherein
the first optical sheet includes a concave overlaid on the casing-side adhesive,
the second optical sheet includes a tab projecting from a side edge of the second optical sheet, and
the tab is stuck on the casing-side adhesive through the concave.

### Claim 13 (depends on 7)

The display device of claim 7, wherein
the case comprises a support frame including a first surface and a second surface on a side opposite to the first surface, and a bottom plate covering the second surface side of the support frame,
the light guide is placed on the bottom plate;
which further comprises a reflective sheet provided between the light guide and the bottom plate, and a cushion member provided between the reflective sheet and the bottom plate,
the cushion member has an elastic resilience, presses the reflective sheet in a first direction of separating from the bottom plate, and is arranged between the reflective sheet and the bottom plate in a state of being shrunk such that the cushion member is shrinkable by pressing from a second direction opposite to the first direction, and
the first optical sheet and the second optical sheet are pressed on the display panel-side by the cushion member side via the reflective sheet and the light guide, and the second optical sheet abuts on the polarizer of the display panel.

### Claim 14 (depends on 13)

The display device of claim 13, wherein
one or more casing-side electrode portions are provided at a position opposed to at least the light guide, on the bottom plate of the case,
the display panel comprises panel-side electrode portions opposed to the casing-side electrode portion or portions via the cushion member, and a controller which transmits a sensor drive signal to the panel-side electrode portions or the casing-side electrode portion or portions and which receives a receive signal based on capacity between the panel-side electrode portion and the casing-side electrode portion from the other electrode portions,
the casing-side electrode portion or portions and the panel-side electrode portions are able to vary a distance between the electrode portions at the own positions in accordance with pressing on a display surface of the display panel by being opposed via the cushion member, and
the controller detects variation in the receive signal based on the variation in distance.

### Claim 15 (depends on 14)

The display device of claim 14, wherein
the panel-side electrode portions are provided between the pair of substrates.

### Claim 16 (depends on 14)

The display device of claim 14, wherein
the display panel comprises a cover panel opposed to the pair of substrates, and
the panel-side electrode portions are provided between the cover panel and the pair of substrates.