2D/3D Switchable Liquid Crystal Lens unit for Display

FOC LLC

Market Demand

http://www.prweb.com/releases/2012/9/prweb9944829.htm

Glass free 3D display with lenticular lens

We need switchable option from 3D to 2D.Nice to have an arbitrary sector of display with

2D and other area with 3D simultaneously.

The modern demand includes 3D object and 2D text

Proposed solution

• Polarization selector layer followed by the polarization dependent lens layer. • The last one shows the lens effect only for one polarization of the light but no

lens effect for the orthogonally polarized light. • The polarization selector stage is bi-stable, where in the first state it rotates

the plane of polarization of the impinging light from the Display to 90 degree and shows 3D object thanks to lens effect. Whereas the other state does not affect plane of the polarization of the impinging Light from the Display and shows 2D mode.

Polarization dependent polymer lens array

Bi-stable (FLC) polarization rotating layer.

Work description

FLC

pol

ariz

atio

n 1

FLC

pol

ariz

atio

n 2

Optics- Lens effect

Applied V pulse

Optical response of the FLC bi-stable polarization rotator stage.

Light from the LCD

LCD

FLC

Optics- No Lens effect

Applied V pulse

Optical response of the FLC bi-stable polarization rotator stage.

Light from the LCD

LCD

FLC

Selective 2D/3D sectors

Jisoo Hong, Youngmin Kim, Hee-Jin Choi, Joonku Hahn, Jae-Hyeung Park, Hwi Kim, Sung-Wook Min, Ni Chen, and Byoungho Lee, "Three-dimensional display technologies of recent interest: principles, status, and issues [Invited]," Appl. Opt. 50, H87-H115 (2011) Yu-Cheng Chang, Tai-Hsiang Jen, Chih-Hung Ting, and Yi-Pai Huang, "High-resistance liquid-crystal lens array for rotatable 2D/3D autostereoscopic display," Opt. Express 22, 2714-2724 (2014) Ruidong Zhu, Su Xu, Qi Hong, Shin-Tson Wu, Chiayu Lee, Chih-Ming Yang, Chang-Cheng Lo, and Alan Lien, "Polymeric-lens-embedded 2D/3D switchable display with dramatically reduced crosstalk," Appl. Opt. 53, 1388-1395 (2014)

LC convex lens, embedded in the concave lens

nano-PDLC lens

Micro-lens structures with different top ITO electrode shapes

The patterned electrode method:The polarization selective mode.

Alternative solutions for 2D-3D switchable lens arrays

Issues and problems• Complicated fabrication for the patterned

electrode i.e. relatively expensive.• Polymer stabilized LC requires tight

restrictions on the index matching otherwise scattering appears.

• Polarization rotator or polarization selector require TN LC panel.

• All existing options provide the 2D-3D switchable function at the cost of the power consumption and for some of them it is extremely high.

Micromachines 2014, 5(2), 300-324; doi:10.3390/mi5020300Jisoo Hong, Youngmin Kim, Hee-Jin Choi, Joonku Hahn, Jae-Hyeung Park, Hwi Kim, Sung-Wook Min, Ni Chen, and Byoungho Lee, "Three-dimensional display technologies of recent interest: principles, status, and issues [Invited]," Appl. Opt. 50, H87-H115 (2011)

Resume• We propose a 2D-3D switchable lens array unit that has two

components: • Polarization dependent lens layer• Polarization rotator/selector Bi-stable layer

• The polarization dependent lens layer shows lens effect for one polarization of the light while no lens effect for the orthogonal polarization of the impinging light.

• The polarization rotator/selector bi-stable stage rotates the plane of polarization of the impinging light from the display and the unit shows the 3D object. Whereas in the other state the polarization rotator/selector bi-stable stage does not affect the plane of polarization of the impinging light from the display and the unit shows the 2D object.

• The proposed unit, unlike other alternative, does not require power to hold any 2D or 3D mode. The unit needs power only to switch from one state to other. Therefore the unit does not consume additional power during the single mode operation.

Appendix

• UV-light• polarization direction• • • azo-dye molecule with• absorption oscillator

•Azo-dye absorption oscillator (chromophore)

OH

NaOOC

NN

SO3Na

NN OH

SO3NaCOONa

V. Chigrinov et al. Phys. Rev. E, (2004).

Diffusion mechanism of azo-dye molecule alignment

Light alignment

Photosensitivemolecules

Photoalignment Layer coated

Exposure withselected light source

Molecules aligned To desired direction

-1,0 -0,8 -0,6 -0,4 -0,2 0,0 0,2 0,4 0,6 0,8 1,0

0

2

4

6

8

10

12

14

16

18

20

22

24

26

(u)

u

A=0,0 A=2,0 A=4,1 A=6,7 A=12,0 A=25,0 A=50,0 A=75,0 A=100,0 A=200,0 A=500,0 A=1000,0

Azo dye monomers

Photo reorientation

Heating

Liquid crystal

Non-polarized UV irradiation

Heat polymerization

Stabilization of the orientation of the azo dyes by heat polymerization

O

O

O

O

NN

2HOOCSO3Na

Polymerizable azo dye

Experiments