TRANSFLECTIVE LIQUID CRYSTAL DISPLAYS

• US 20090033837A1
• Filed: 10/01/2008
• Published: 02/05/2009
• Est. Priority Date: 09/22/1998
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Tillin, Martin David, Molsen, Henning
• Granted Patent: US 7,791,694 B2
• Time in Patent Office: Days
• US Class Current: 349/96
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 1/133622 Colour sequential illumination
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133638 Waveplates, i.e. plates with a retardation value of lambda/n
• CPC Class Codes: G02F 2203/09 transflective
• CPC Class Codes: G02F 2413/04 Number of plates greater than or equal to 4
• CPC Class Codes: G02F 2413/06 Two plates on one side of the LC cell
• CPC Class Codes: G02F 2413/08 with a particular optical axis orientation

Abstract

A transflective liquid crystal display (70) comprises a liquid crystal cell (38) disposed between a front substrate (40) and a rear substrate (36), a front polariser (46) located in front of the front substrate (40) and a rear polariser (32) located behind the rear substrate (36), a front retarder (42, 44) located between the front substrate (40) and the front polariser (46), a rear retarder (62, 64) located between the rear substrate (36) and the rear polariser (32), and a light source (30) located behind the rear polariser (32). A transflective display having a number of differently coloured sequentially flashing backlights is also provided.

Claims

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51. A transflective display, comprising:

a liquid crystal divided into a plurality of pixels,

addressing means for addressing each pixel and switching each pixel between different states resulting in different levels of transmission of light through the display,

a flashing backlight located behind the liquid crystal, and

a partially reflective mirror located between the liquid crystal and a rear polariser for both reflecting ambient light back through the liquid crystal and allowing transmission of light from the backlight through the liquid crystal,

wherein each pixel is provided with a light filter,

the backlight comprises a plurality of sequentially flashing light sources,

the liquid crystal is disposed between a front substrate and a rear substrate,

a front polariser is located in front of the front substrate,

the rear polariser is located behind the rear substrate, and

the rear substrate is provided with the partially reflective mirror.

54. A transflective display as claimed in claim 51, wherein the liquid crystal forms a Pi or OCB cell.

81. A transflective display as claimed in claim 51, in which the LC has substantially parallel surface director orientations.

82. A transflective display as claimed in claim 81, in which the LC is formed from a Pi cell.

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