Liquid crystal panel module, backlight module and liquid crystal display

• US 8,736,787 B2
• Filed: 01/06/2011
• Issued: 05/27/2014
• Est. Priority Date: 02/04/2010
• Status: Active Grant

• Current Assignee: CM Technology Corporation, InnoLux Corporation
• Original Assignee: CHI MEI Corporation, InnoLux Corporation, K Laser Technology Incorporated
• Inventors: Chang, Hsin-Wen, Li, Wang-Yang, Lin, Hung-Yu, Liang, Yi-Pan, Wang, Chien-Chih, Lee, Wai-Hon, Tsai, Hua-Fang
• Primary Examiner(s): Stahl, Mike
• Application Number:
  US12/985,534
• Publication Number:
  US 20110187964A1
• Time in Patent Office: 1,237 Days
• Field of Search: None
• US Class Current: 349/65
• CPC Class Codes: G02B 5/1809 with pitch less than or comparable to the wavelength
• CPC Class Codes: G02F 1/1335 Structural association of cells with optical devices, e.g. polarisers or reflectors
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 2201/305 diffraction grating

Abstract

A liquid crystal panel module, a backlight module and a liquid crystal display (LCD) are provided. The liquid crystal panel module includes a liquid crystal panel and a diffraction grating layer. The liquid crystal panel has a plurality of pixels. The diffraction grating layer is disposed on the liquid crystal panel, and a maximum period of a grating of the diffraction grating layer is smaller than 1/10 of a size of the pixels. The backlight module includes a light guide plate, a light emitting element and a diffraction grating film. A light provided by the light emitting element emits from a light emitting surface of the light guide plate and is bended towards the light emitting element after passing through the diffraction grating film. The liquid crystal panel module and the backlight module can be applied to the LCD together or individually.

Claims

1. A backlight module, comprising:

a light guide plate, having at least a light incident surface, a light emitting surface and a bottom surface, wherein the light emitting surface is opposite to the bottom surface;

a light emitting element, disposed next to the light incident surface;

a reflective diffraction grating film, disposed next to the bottom surface, wherein the reflective diffraction grating is configured to reflect a part of light provided by the light emitting element which passes through the light incident surface and the bottom surface back through the bottom surface to emit from the light emitting surface; and

a reflective material layer, disposed on a surface of the reflective diffraction grating film facing away from the light guide plate.

2. The backlight module as claimed in claim 1, wherein a grating of the reflective diffraction grating film is a binary approximation blazed grating.

3. The backlight module as claimed in claim 1, wherein a grating of the reflective diffraction grating film is a blazed grating.

4. A liquid crystal display, comprising:

a backlight module as claimed in claim 1; and

a liquid crystal panel module, disposed on the backlight module.