Liquid crystal display device and electronic device using the same

• US 8,049,861 B2
• Filed: 10/14/2005
• Issued: 11/01/2011
• Est. Priority Date: 10/19/2004
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Miyachi, Koichi
• Primary Examiner(s): CHEN, WEN YING PATTY
• Application Number:
  US11/577,438
• Publication Number:
  US 20090046221A1
• Time in Patent Office: 2,209 Days
• Field of Search: None
• US Class Current: 349/182
• CPC Class Codes: C09K 19/18 the chain containing carbon-to-carbon triple bonds, e.g. tolans
• CPC Class Codes: C09K 19/322 Compounds containing a naphthalene ring or a completely or partially hydrogenated naphthalene ring
• CPC Class Codes: C09K 2323/03 Viewing layer characterised by chemical composition
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133617 Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 1/133788 by light irradiation, e.g. linearly polarised light photo-polymerisation
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 2201/086 UV absorbing

Abstract

A liquid crystal display device includes an illuminator and a liquid crystal panel for performing displaying by using light which is emitted from the illuminator. The liquid crystal panel includes a pair of substrates, a liquid crystal layer provided between the pair of substrates, and a pair of alignment films provided on sides of the pair of substrates facing the liquid crystal layer. At least one of the alignment films is a photo-alignment film which is imparted with an orientation regulating force through a photo-alignment treatment, and the illuminator includes a light source causing primary generation of at least blue light, among other light which is used for displaying.

Claims

1. A liquid crystal display device comprising an illuminator and a liquid crystal panel arranged to perform displaying by using light which is emitted from the illuminator, wherein,

the liquid crystal panel includes a pair of substrates, a liquid crystal layer provided between the pair of substrates, and a pair of alignment films provided on sides of the pair of substrates facing the liquid crystal layer;

at least one of the pair of alignment films is imparted with an orientation regulating force by an irradiation with ultraviolet light;

the illuminator includes a light source causing primary generation of at least blue light, among other light which is used for displaying;

the liquid crystal layer is formed of a liquid crystal material which contains molecules having at least one of a carbon-carbon triple bond and a polycyclic group; and

a coefficient of rotational viscosity γ

₁ of the liquid crystal material at 20°

C. is 120 mPa·

s or less.

2. The liquid crystal display device of claim 1, wherein a spectrum of blue light which is emitted by the light source has a peak wavelength at 380 nm or more.

3. The liquid crystal display device of claim 1, wherein the light source generates substantially no light in an ultraviolet region.

4. The liquid crystal display device of claim 1, wherein the light source is a light-emitting diode.

5. The liquid crystal display device of claim 1, wherein the light source is an electroluminescence element.

6. The liquid crystal display device of claim 1, wherein the light source is a discharge tube.

7. The liquid crystal display device of claim 1, wherein the liquid crystal panel performs displaying in a vertical alignment mode.

8. The liquid crystal display device of claim 1, wherein the liquid crystal panel performs displaying in an in-plane switching mode.

9. The liquid crystal display device of claim 1, wherein the liquid crystal panel further includes a plurality of pixel regions each capable of modulating light emitted from the illuminator, and a switching element provided in each of the plurality of pixel regions.

10. The liquid crystal display device of claim 1, wherein the molecules contained in the liquid crystal material have a chemical structure expressed by one of the following formulae:

11. The liquid crystal display device of claim 10, wherein the liquid crystal material contains 25 weight % or more of the molecules having the chemical structure.

12. The electronic apparatus comprising the liquid crystal display device of claim 1.

13. The electronic apparatus of claim 12, further comprising circuitry for receiving a television broadcast.

14. The liquid crystal display device of claim 1, wherein the liquid crystal panel is arranged to perform displaying in a fringe field switching mode.

15. The liquid crystal display device of claim 1, wherein:

the liquid crystal panel further includes a plurality of pixel regions each capable of modulating light emitted from the illuminator; and

each of the plurality of pixel regions is orientation-divided into four types of regions.

16. The liquid crystal display device of claim 1, wherein the illuminator is capable of causing primary or secondary generation of red light and primary or secondary generation of green light.

17. The liquid crystal display device of claim 1, wherein the at least one of the pair of alignment films is at least partially imparted with an orientation regulating force by an irradiation with ultraviolet light.