Abstract

This study proposes a two-field driving scheme for field sequential color liquid crystal displays (LCDs) without color filters. The proposed scheme is based on angularly positioned color LEDs. In each field, the angular rays of two colors are collimated by a collimation lens, redirected by a light guide, and converged by a cylindrical-lens array to map into corresponding sub-pixel positions to efficiently display color images. The three main advantages of this approach are the elimination of dye color filters, high feasibility using conventional ultra-precision machining processes, and a larger color gamut.

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References

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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
  6. S. G. Kang, J-S. Lee, H-H. Hwang, and C-S. Cho, “A design optimization of the OCB-Mode for the application of field-sequential color microdisplays,” SID 01 Digest, 855−857 (2001).
  7. P.-C. Chen, H.-H. Lin, C.-H. Chen, C.-H. Lee, and M.-H. Lu, “Color separation system with angularly positioned light source module for pixelized backlighting,” Opt. Express18(2), 645–655 (2010).
    [CrossRef] [PubMed]
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  9. M. J. J. Jak, G. J. Hekstra, J. J. L. Hoppenbrouwers, F. J. Vossen, N. Raman, and O. Belik, “Spectrum sequential liquid crystal display,” SID 05 Digest, 1120–1123 (2005).
  10. Y.-K. Cheng, Y.-P. Huang, Y.-R. Cheng, and H.-P. D. Shieh, “Two-field Scheme: spatiotemporal modulation for field sequential color LCDs,” J. Disp. Technol.5(10), 385–390 (2009).
    [CrossRef]
  11. ZEMAX, Radiant ZEMAX, Inc., http://www.radiantzemax.com/en/design/ .
  12. Advanced System Analysis Program, (ASAP TM), Breault Research Organization, Inc., http://www.breault.com/index.php .
  13. F. Yamada, S. Ono and Y. Taira, “Dual layered very thin flat surface micro prism array directly molded in an LCD cell,” Euro display 2002, 339–342 (2002).

2010 (1)

2009 (2)

Y.-K. Cheng, Y.-P. Huang, Y.-R. Cheng, and H.-P. D. Shieh, “Two-field Scheme: spatiotemporal modulation for field sequential color LCDs,” J. Disp. Technol.5(10), 385–390 (2009).
[CrossRef]

H.-H. Lin, C.-H. Lee, and M.-H. Lu, “Dye-less color filter fabricated by roll-to-roll imprinting for liquid crystal display applications,” Opt. Express17(15), 12397–12406 (2009).
[CrossRef] [PubMed]

2007 (1)

1998 (1)

T. V. Gunn and W. Haistead, “Diffractive color separation fabrication,” Proc. SPIE3363, 198–208 (1998).
[CrossRef]

1997 (1)

1978 (1)

Caputo, R.

Chen, C.-H.

Chen, P.-C.

Cheng, Y.-K.

Y.-K. Cheng, Y.-P. Huang, Y.-R. Cheng, and H.-P. D. Shieh, “Two-field Scheme: spatiotemporal modulation for field sequential color LCDs,” J. Disp. Technol.5(10), 385–390 (2009).
[CrossRef]

Cheng, Y.-R.

Y.-K. Cheng, Y.-P. Huang, Y.-R. Cheng, and H.-P. D. Shieh, “Two-field Scheme: spatiotemporal modulation for field sequential color LCDs,” J. Disp. Technol.5(10), 385–390 (2009).
[CrossRef]

Cornelissen, H. J.

Dammann, H.

de Boer, D. K. G.

De Sio, L.

Delboulbé, A.

Gunn, T. V.

T. V. Gunn and W. Haistead, “Diffractive color separation fabrication,” Proc. SPIE3363, 198–208 (1998).
[CrossRef]

Haistead, W.

T. V. Gunn and W. Haistead, “Diffractive color separation fabrication,” Proc. SPIE3363, 198–208 (1998).
[CrossRef]

Hornix, E. J.

Huang, Y.-P.

Y.-K. Cheng, Y.-P. Huang, Y.-R. Cheng, and H.-P. D. Shieh, “Two-field Scheme: spatiotemporal modulation for field sequential color LCDs,” J. Disp. Technol.5(10), 385–390 (2009).
[CrossRef]

Huignad, J. P.

Jak, M. J. J.

Joubert, C.

Lee, C.-H.

Lin, H.-H.

Loiseaux, B.

Lu, M.-H.

Shieh, H.-P. D.

Y.-K. Cheng, Y.-P. Huang, Y.-R. Cheng, and H.-P. D. Shieh, “Two-field Scheme: spatiotemporal modulation for field sequential color LCDs,” J. Disp. Technol.5(10), 385–390 (2009).
[CrossRef]

Appl. Opt. (2)

J. Disp. Technol. (1)

Y.-K. Cheng, Y.-P. Huang, Y.-R. Cheng, and H.-P. D. Shieh, “Two-field Scheme: spatiotemporal modulation for field sequential color LCDs,” J. Disp. Technol.5(10), 385–390 (2009).
[CrossRef]

Opt. Express (3)

Proc. SPIE (1)

T. V. Gunn and W. Haistead, “Diffractive color separation fabrication,” Proc. SPIE3363, 198–208 (1998).
[CrossRef]

Other (6)

R. L. D. Silverstein, “STColor: hybrid spatial-temporal color synthesis for enhanced display image quality,” SID 05 Digest, 1112–1115 (2005).

M. J. J. Jak, G. J. Hekstra, J. J. L. Hoppenbrouwers, F. J. Vossen, N. Raman, and O. Belik, “Spectrum sequential liquid crystal display,” SID 05 Digest, 1120–1123 (2005).

S. G. Kang, J-S. Lee, H-H. Hwang, and C-S. Cho, “A design optimization of the OCB-Mode for the application of field-sequential color microdisplays,” SID 01 Digest, 855−857 (2001).

ZEMAX, Radiant ZEMAX, Inc., http://www.radiantzemax.com/en/design/ .

Advanced System Analysis Program, (ASAP TM), Breault Research Organization, Inc., http://www.breault.com/index.php .

F. Yamada, S. Ono and Y. Taira, “Dual layered very thin flat surface micro prism array directly molded in an LCD cell,” Euro display 2002, 339–342 (2002).

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Figures (9)

Fig. 1
Fig. 1

A color separation backlight side-lit by an array of R-G-B-G-R LEDs.

Fig. 2
Fig. 2

(a) An arrangement of R-G-B LEDs and a collimation lens performs the angular color-separation, but induces asymmetrical illumination (such as the red rays shown) in the light guide and color mixing after passing through the cylindrical-lens array; (b) An arrangement of R-G-B-G-R LEDs and a collimation lens generates the symmetric angular color-separation in the light guide without color mixing after passing through the cylindrical-lens array.

Fig. 3
Fig. 3

An arrangement of RG-B-RG LEDs to a collimation lens yields the angular color-separation. After passing through the cylindrical-lens array, two conventional color filter layers filter the mixing colors to produce three primary colors: R, B, and G.

Fig. 4
Fig. 4

The configuration of ALED-ST in (a) field 1 and (b) field 2.

Fig. 5
Fig. 5

(a) With color LEDs being set on the focal plane of a collimation lens, the color rays are collimated; (b) The corresponding propagation picture drawn by ASAPTM.

Fig. 6
Fig. 6

(a) Schematic V-grooves and reflector of the light guide; (b) The uniformity of the output rays from light guide.

Fig. 7
Fig. 7

(a) Geometry of the cylindrical-lens array with respect to the pixels; (b) Simulated optical diagram of the cylindrical lens array. LC layer are set around the focal plane with less color crosstalk; (c) and (d) are the footprint diagrams for field 1 and field 2, respectively.

Fig. 8
Fig. 8

(a) Photograph of a 3-in-1 RGB LED; (b) A diamond cutter with the designed profile was used to cut the mold on a roller; (c) The cross-sectional profile of a cylindrical lens under the microscope; (d) SEM image of the cross-sectional profile of a wave film.

Fig. 9
Fig. 9

(a) The optical measurement setup for measuring the performance of the ALED-ST system; (b) Top view of the system with red and green LEDs lit simultaneously; One periodic line pattern captured by a CCD camera. (c) The R-B-R (left image) and (d) G-B-G (right image) for field 1 and field 2, respectively.

Tables (1)

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Table 1 Comparison of ALED-ST Performance with Current Color-separation Technologies

Equations (3)

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H~F×tan(θ)
p= D 2 =( t 1 + t 2 + t 3 + t 4 )×tanϕ
f= t 1 n 1 + t 2 n 2 + t 3 n 3 + t 4 n 4 =( t 1 + t 2 + t 3 + t 4 )n

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