# US 7,746,426 B2 · Liquid crystal display comprising a wide view polarizer

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- Number: US 7,746,426 B2
- Document ID: US7746426B2
- Status: Granted
- Kind: B2
- Application number: 11/874,651
- Filed: 2007-10-18
- Published: 2008-04-24
- Granted: 2010-06-29
- Earliest claimed: 2006-10-18
- Assignees: Samsung Electronics Co., Ltd.
- Inventors: Sang-Woo Kim; Yi Li
- Web page: https://patentgrep.com/patent/US7746426B2

## CPC

- G02F 1/133528: {Polarisers}
- G02F 1/133531: {characterised by the arrangement of polariser or analyser axes}
- G02F 1/133567: {on the back side}
- G02F 1/1393: {the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells (G02F1/1396, G02F1/141 take precedence)}
- 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 liquid crystal display includes a first display panel including a first substrate and a lower alignment layer formed on the first substrate, a second display panel that includes a second substrate facing the first substrate to maintain a predetermined cell gap between the substrates and an upper alignment layer formed on the second substrate, a liquid crystal layer provided between the first and second display panels, a wide view polarizer and a lower polarizer sequentially attached to the outside of the first display panel, and an upper polarizer attached to the outside of the second display panel. An absorption axis of the wide view polarizer is inclined with respect to an absorption axis of the lower polarizer by 45°. An absorption axis C′ inclined with respect to the absorption axis A′ of the lower polarizer by 45° is interposed between the lower polarizer and the liquid crystal panel in the backlit electrically controlled birefringence (ECB) mode.

## Claims

### Claim 1

A liquid crystal display comprising:
a first display panel including a first substrate and a lower alignment layer formed on the first substrate;
a second display panel including a second substrate and an upper alignment layer formed on the second substrate, the second substrate facing the first substrate to maintain a predetermined cell gap between the substrates;
a liquid crystal layer provided between the first and second display panels;
a wide view polarizer and a lower polarizer sequentially attached to the outside of the first display panel; and
an upper polarizer attached to the outside of the second display panel, wherein an absorption axis of the wide view polarizer is inclined with respect to an absorption axis of the lower polarizer by 45°.

### Claim 2 (depends on 1)

The liquid crystal display of claim 1, wherein a lower rubbing axis of the lower alignment layer is reversed and parallel to a rubbing axis of the upper alignment layer.

### Claim 3 (depends on 2)

The liquid crystal display of claim 2, wherein the lower rubbing axis is reversed and parallel to the absorption axis of the wide view polarizer.

### Claim 4 (depends on 3)

The liquid crystal display of claim 3, wherein the liquid crystal layer is formed of liquid crystal that has positive refractive anisotropy.

### Claim 5 (depends on 4)

The liquid crystal display of claim 4, wherein the wide view polarizer includes a compensation film and wide view supporters.

### Claim 6 (depends on 5)

The liquid crystal display of claim 5, wherein the compensation film is an O-plate.

### Claim 7

A liquid crystal display comprising:
a first display panel including a first substrate and a lower alignment layer formed on the first substrate;
a second display panel including a second substrate and an upper alignment layer formed on the second substrate, the second substrate facing the first substrate to maintain a predetermined cell gap between the substrates;
a liquid crystal layer provided between the first and second display panels;
a lower polarizer attached to the outside of the first display panel; and
a wide view polarizer and an upper polarizer sequentially attached to the outside of the second display panel,
wherein an absorption axis of the wide view polarizer is inclined with respect to an absorption axis of the upper polarizer by 45°.

### Claim 8 (depends on 7)

The liquid crystal display of claim 7, wherein a lower rubbing axis of the lower alignment layer is reversed and parallel to an upper rubbing axis of the upper alignment layer.

### Claim 9 (depends on 8)

The liquid crystal display of claim 8, wherein the upper rubbing axis is reversed and parallel to the absorption axis of the wide view polarizer.

### Claim 10 (depends on 9)

The liquid crystal display of claim 9, wherein the liquid crystal layer is formed of liquid crystal, which has positive refractive anisotropy, in an electrically controlled birefringence (ECB) mode.

### Claim 11 (depends on 10)

The liquid crystal display of claim 10, wherein the wide view polarizer includes a compensation film and wide view supporters.

### Claim 12 (depends on 11)

The liquid crystal display of claim 11, wherein the compensation film is an O-plate.