# US 2014/0153223 A1 · Led unit and display incoporating the same

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- Number: US 2014/0153223 A1
- Document ID: US20140153223A1
- Status: Published application
- Kind: A1
- Application number: 13/749,580
- Filed: 2013-01-24
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: Hon Hai Precision Industry Co., Ltd.
- Applicants: Hon Hai Precision Industry Co., Ltd.
- Inventors: I-THUN LIN
- Web page: https://patentgrep.com/patent/US20140153223A1

## CPC

- G02F 1/133603: {with LEDs}
- G02B 3/08: with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)}
- G02B 19/0061: {the light source comprising a LED}
- G02F 1/133607: {the light controlling member including light directing or refracting elements, e.g. prisms or lenses}
- 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

An LCD module includes a screen, a light diffusion plate, a lens and an LED. The lens covers the LED. The lens includes a main body having a bottom face and a top face opposite to the bottom face. The bottom face of the main body defines a cavity to receive the LED. The top face of the main body forms a plurality of concentric annuluses thereon. Each annulus has a first face perpendicular to the top face of the main body, and a second face inclined relative to the top face of the main body, to thereby diverge a part of light from the LED and into the lens. A central area of the top face of the main body is surrounded by an innermost annulus, and forms a rough face for diffusion another part of the light from the LED into the lens.

## Claims

### Claim 1

An LED (light emitting diode) unit for illuminating a screen of an LCD module via a diffusion plate, comprising:
an LED; and
a lens covering the LED, the lens comprising a main body having a top face configured for facing the diffusion plate and a bottom face facing the LED, a plurality of annuluses being formed on the top face of the main body, each of the annuluses having a first face non-parallel to the top face of the main body and a second face inclined relative to the top face of the main body, an area of the top face of the main body surrounded by an innermost annulus being a rough face;
wherein light emitted from the LED with a large emergent angle is diverged by the annuluses, and light emitted from the LED with a small emergent angle is diffused by the rough face, whereby the light emitted from the LED obtains a uniform light distribution.

### Claim 2 (depends on 1)

The LED unit of claim 1, wherein the first face of each annulus is perpendicular to the top face of the main body.

### Claim 3 (depends on 1)

The LED unit of claim 1, wherein an angle defined between the first face and the second face of each annulus is less than 90 degrees.

### Claim 4 (depends on 3)

The LED unit of claim 3, wherein the angle defined between the first face and the second face of each annulus is 45 degrees.

### Claim 5 (depends on 1)

The LED unit of claim 1, wherein the first face of each annulus directly connects the second face of an adjacent annulus.

### Claim 6 (depends on 1)

The LED unit of claim 1, wherein the rough face is located at a central area of the top face of the main body.

### Claim 7 (depends on 7)

The LED unit of claim 7, wherein the annuluses are concentric about a center of the top face of the main body.

### Claim 8 (depends on 1)

The LED unit of claim 1, wherein the main body forms a concave light-incident face in the bottom face thereof, the LED being surrounded by the light-incident face.

### Claim 9 (depends on 8)

The LED unit of claim 8, wherein the light-incident face is aligned with the rough face.

### Claim 10 (depends on 1)

The LED unit of claim 1, wherein the lens further comprises a plurality of legs extending from the bottom face of the main body towards the LED.

### Claim 11 (depends on 1)

The LED unit of claim 1, wherein the first face of each annulus is located more adjacent to the rough face than the second face of each annulus.

### Claim 12

An LCD module comprising:
a screen;
a diffusion plate located behind the screen;
an LED (light emitting diode) module; and
a lens placed between the LED module and the diffusion plate;
wherein the lens comprising a main body having a top face facing the light diffusion plate and a bottom face facing the LED, a plurality of annuluses being formed on the top face of the main body, each annulus having a first face perpendicular to the top face of the main body and a second face inclined relative to the top face of the main body, an area of the top face of the main body surrounded by an innermost annulus being a rough face; and
wherein light emitted from the LED is diffused by the rough face and the annuluses of the lens onto the light diffusion plate.

### Claim 13 (depends on 12)

The LCD module of claim 12, wherein an angle defined between the first face and the second face of each annulus is 45 degrees.

### Claim 14 (depends on 12)

The LCD module of claim 12, wherein the first face of each annulus directly connects the second face of an adjacent annulus.

### Claim 15 (depends on 12)

The LCD module of claim 12, wherein the first face of each annulus is located nearer the rough face than the second face of each annulus.

### Claim 16 (depends on 12)

The LCD module of claim 12, wherein the lens further comprises a plurality of legs extending downwardly from the bottom face of the main body towards the LED.

### Claim 17 (depends on 12)

The LCD module of claim 12, wherein the main body defines a cavity in the bottom face thereof, an inner face of the main body defining the cavity forming a light incident face of the lens to receive the light emitted from the LED.

### Claim 18 (depends on 16)

The LCD module of claim 16, wherein the LED module further comprises a substrate supporting the LED thereon, the legs of the lens being disposed on the substrate.