Illumination device, dedicated glasses, analyzer and illumination system

Patent metadata

Field	Value
Publication number	US-9594273-B2
Application number	US-201414652220-A
Country	US
Kind code	B2
Filing date	Sep 20, 2014
Priority date	Jun 19, 2014
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

An illumination device, dedicated glasses thereof, an analyzer thereof and an illumination system are provided. The illumination device includes a support member and a liquid crystal display panel mounted on the support member. The liquid crystal display panel includes a display area and a light emitting area, the liquid crystal display panel is provided with a first polarization sheet at its light incoming side in areas corresponding to the display area and the light emitting area, and is provided with a second polarization sheet at its light outgoing side only in area corresponding to the display area. The illumination device emits white light and can be used as an ordinary lamp because its light emitting area cannot be observed in the naked eye state, and when observed through the dedicated glasses or the analyzer, the content of the secret information displayed by the liquid crystal display panel can be seen.

First claim

What is claimed is:

1. An illumination device including a support member and a liquid crystal display panel mounted on the support member, wherein:
the liquid crystal display panel comprises a display area and a light emitting area;
areas at a light incoming side of the liquid crystal display panel corresponding to the display area and the light emitting area are provided with a first polarization sheet; and
an area at a light outgoing side of the liquid crystal display panel corresponding only to the display area is provided with a second polarization sheet.

2. The illumination device according to claim 1 , wherein:
the area at the light outgoing side of the liquid crystal display panel corresponding to the light emitting area is provided with a quarter-wave plate, a fast axis of the quarter-wave plate forms a predetermined angle with a polarization axis of the first polarization sheet, and the predetermined angle is larger than or equal to 0 degree, and is less than or equal to 90 degrees.

3. The illumination device according to claim 2 , wherein the predetermined angle is 45 degrees.

4. The illumination device according to claim 2 , wherein the liquid crystal display panel includes an array substrate and a counter substrate arranged opposite to each other, and a liquid crystal layer provided between the counter substrate and the array substrate; wherein:
a black matrix layer and a color filter layer are provided at a side of the counter substrate facing the array substrate or at a side of the array substrate facing the counter substrate; or
only the black matrix layer is provided at the side of the counter substrate facing the array substrate or at the side of the array substrate facing the counter substrate.

5. The illumination device according to claim 4 , further comprising a transflective layer provided on a transparent substrate at a side of the counter substrate facing away from the array substrate.

6. The illumination device according to claim 1 , wherein the liquid crystal display panel includes an array substrate and a counter substrate arranged opposite to each other, and a liquid crystal layer provided between the counter substrate and the array substrate; wherein:
a black matrix layer and a color filter layer are provided at a side of the counter substrate facing the array substrate or at a side of the array substrate facing the counter substrate; or
only the black matrix layer is provided at the side of the counter substrate facing the array substrate or at the side of the array substrate facing the counter substrate.

7. The illumination device according to claim 6 , further comprising a transflective layer provided on a transparent substrate at a side of the counter substrate facing away from the array substrate.

8. The illumination device according to claim 6 , further comprising a transflective layer provided on a transparent substrate at a side of the counter substrate facing away from the array substrate.

9. A dedicated glasses for the illumination device according to claim 1 , comprising lenses each having a second polarization sheet.

10. The dedicated glasses according to claim 9 , wherein,
the lenses each further include a quarter-wave plate, and the quarter-wave plate and the second polarization sheet are arranged sequentially in a direction from a light incoming side of the lenses to a light outgoing side thereof; and
a fast axis of the quarter-wave plate forms an angle, equal to a predetermined angle with a polarization axis of the second polarization sheet, or a sum of the angle formed between the fast axis of the quarter-wave plate and the polarization axis of the second polarization sheet and the predetermined angle is 90 degrees.

11. An analyzer for the illumination device according to claim 1 , comprising a second polarization sheet.

12. The analyzer according to claim 11 , further including a quarter-wave plate, wherein the quarter-wave plate and the second polarization sheet are arranged sequentially in a direction from the light incoming side to the light outgoing side,
an angle formed between a fast axis of the quarter-wave plate and a polarization axis of the second polarization sheet is equal to a predetermined angle, or a sum of the angle formed between the fast axis of the quarter-wave plate and the polarization axis of the second polarization sheet and the predetermined angle is 90 degrees.

13. An illumination system comprising the illumination device according to claim 1 , and further comprising a dedicated glasses comprising lenses each having a second polarization sheet or an analyzer.

14. The illumination system according to claim 13 , wherein:
the liquid crystal display panel is provided with a quarter-wave plate at the light outgoing side in the area corresponding to the light emitting area, the dedicated glasses include the lenses each having a quarter-wave plate or the analyzer includes a quarter-wave plate.

15. The illumination system according to claim 14 , wherein:
the quarter-wave plate and the second polarization sheet are arranged sequentially in a direction from the light incoming side to the light outgoing side, an angle formed between a fast axis of the quarter-wave plate and a polarization axis of the second polarization sheet is equal to a predetermined angle, or a sum of the angle formed between the fast axis of the quarter-wave plate and the polarization axis of the second polarization sheet and the predetermined angle is 90 degrees.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Li Wenbo
• Wu Yanbing
• Dong Yefei
• Ji Chunyan

Classifications

• G02F1/133555

  Transflectors · CPC title

• G02B5/3083

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title

• G02F1/13363

  Birefringent elements, e.g. for optical compensation · CPC title

• G02F2001/133638

  Physics · mapped topic

• G02F1/133528 Primary

  Polarisers · CPC title