Hybrid type liquid crystal display device

• US 8,848,133 B2
• Filed: 12/17/2010
• Issued: 09/30/2014
• Est. Priority Date: 04/23/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Park, Se-Hong, Kim, Eung-Do, Park, Jong-Sin
• Primary Examiner(s): Kim, Dennis Y
• Application Number:
  US12/971,242
• Publication Number:
  US 20110261289A1
• Time in Patent Office: 1,383 Days
• Field of Search: 463 32- 34, 349/65, 349/96, 362 971- 973
• US Class Current: 349/65
• CPC Class Codes: G02F 1/133374 for displaying permanent signs or marks
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133538 with spatial distribution of the polarisation direction

Abstract

The present disclosure relates to a hybrid type liquid crystal display device. The present disclosure suggests a hybrid type liquid crystal display device comprising a liquid crystal display panel having a display area; and a window area defined within the display area, wherein an image disposed at outside of the liquid crystal display panel is shown in front of the liquid crystal panel through the window area. The present disclosure suggests a hybrid type display device in which main video data is represented using the liquid crystal display device, an additional image represented on an external screen is shown through the liquid crystal display device, or the external image can be shown by overlapping with the main video data of the liquid crystal display device, as needed.

Claims

1. A hybrid type liquid crystal display device comprising:

a liquid crystal display panel having a display area, and a window area defined within the display area as a part of the display area, wherein an image data is displayed at the window area;

a first polarization film disposed at a front surface of the liquid crystal display panel with a size corresponding to the display area and a first polarization axis;

a light guide panel disposed at a rear surface of the liquid crystal display panel;

a light source disposed at a side surface of the light guide panel for providing a back light into the light guide panel;

a second polarization film disposed behind the liquid crystal display panel for polarizing the back light to a second polarization axis perpendicular to the first polarization axis;

a reflection sheet disposed at a rear surface of the light guide panel for reflecting the back light to the front surface of the light guide panel, and having an aperture area corresponding to the window area; and

a cover bottom disposed at the rear surface of the reflection sheet for housing the light guide panel and the light source, and having an aperture portion corresponding to the window area,

wherein an image disposed outside of the liquid crystal display panel is shown in front of the liquid crystal display panel through the window area;

wherein the second polarization film includes;

a side polarization film disposed on the side surface of the light guide panel and between the light source and the light guide panel, wherein the side polarization film polarizes a portion of the back light corresponding to the window area to have the second polarization axis; and

a lower polarization film disposed on the rear surface of the liquid crystal display panel, and having an opening area corresponding to the window area, wherein the lower polarization film polarizes a portion of the back light corresponding to the display area excepting the window area to have the second polarization axis.

2. The device according to the claim 1, wherein the second polarization film is disposed between the light guide panel and the light source to polarize the back light to the second polarization axis.

3. The device according to the claim 2, wherein the light guide panel includes a plurality of polarized light protection patterns formed on a rear surface of the light guide panel to protect the polarized light having the second polarization axis.

4. The device according to the claim 1, wherein the light guide panel includes:

a plurality of polarized light protection patterns disposed on a portion of a rear surface of the light guide panel corresponding to the window area to protect the polarized light having the second polarization axis; and

a plurality of reflective patterns disposed on a portion of a rear surface of the light guide panel excepting the window area to reflect the back light to a front surface of the light guide panel.

5. The device according to the claim 4, further comprising:

optical sheets disposed between the lower polarization film and the light guide panel, wherein a portion of the optical sheets corresponding to the window area is removed.

6. The device according to the claim 5, wherein the optical sheets include:

a lower diffusion film disposed on a front surface of the light guide panel;

a prism sheet stacked on a front surface of the lower diffusion film; and

an upper diffusion film stacked on a front surface of the prism sheet.

7. The device according to the claim 1, wherein the second polarization film includes a lower polarization film disposed between the liquid crystal display panel and the light guide panel with a plan size corresponding to the display area.

8. The device according to the claim 7, wherein the lower polarization film has a portion corresponding to the window area, wherein the portion of the lower polarization film has light transmissivity of 60%.

9. The device according to the claim 7, wherein the light guide panel includes:

a plurality of reflective patterns disposed on a portion of a rear surface of the light guide panel excepting the window area to reflect the back light to a front surface of the light guide panel,

wherein the window area of the portion of the rear surface of the light guide panel has no pattern.

10. The device according to the claim 9, further comprising:

optical sheets disposed between the lower polarization film and the light guide panel, wherein a portion of the optical sheets corresponding to the window area is removed.

11. The device according to the claim 10, wherein the optical sheets include:

a lower diffusion film disposed on a front surface of the light guide panel;

a prism sheet stacked on a front surface of the lower diffusion film; and

an upper diffusion film stacked on a front surface of the prism sheet.