Simulations of birefringent gratings as polarizing color separator in backlight for flat-panel displays

Xu, Man; Urbach, H. P.; Boer, Dick K. G. de

doi:10.1364/oe.15.005789

Cited by 18 publications

(12 citation statements)

References 9 publications

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“…The s-polarization is transmitted, and the almost negligible contribution of the p-polarization is attributed to the refractive-index mismatch between the modeled substrate and the ordinary axis of the LC polymer. 52 In summary, a diffractive backlight should be manufactured on a high-refractive-index material. Also, the grating period should be subwavelength, and the grating profile asymmetric, in order to couple out only one desired diffraction order and to suppress all other but the zeroth (reflected) diffraction order.…”

Section: Principles Of Diffractive Backlight Unitsmentioning

confidence: 99%

Review Paper: Diffractive backlight technologies for mobile applications

Kimmel

2012

J Soc Info Display

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Liquid-crystal-display backlight units have developed in their conventional configuration into very efficient and uniform components that allow the display to present a high-quality image to the user. Developing the backlight unit itself further faces a challenge of diminishing returns to the investment in innovation. A system-level redesign is required for the entire display module, and diffractive alternatives to the backlight design can allow a more-energy-efficient design for the display. This review concentrates on small-to-medium displays because diffractive backlight studies have also centered in this class of displays. The state of the art of backlight design is summarized and the motivation for energy-efficient system design is outlined. The theoretical basis of diffractive backlights is given, and key research studies in the area of diffractive backlights are reviewed. Finally, a discussion on the performance and future outlook of diffractive backlights completes the paper.

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Section: Principles Of Diffractive Backlight Unitsmentioning

confidence: 99%

Review Paper: Diffractive backlight technologies for mobile applications

Kimmel

2012

J Soc Info Display

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“…We have studied anisotropic media that are translation invariant with respect to one direction in previous work [19]. It has been shown there that for a configuration consisting of anisotropic materials of which the dielectric permittivity ε is invariant with respect to the y-coordinate, the Maxwell's equations can be reformulated as two coupled partial differential equations for the y-component of the electromagnetic field E y and H y only.…”

Section: Periodic Gratings Consisting Of Anisotropic Materialsmentioning

confidence: 99%

“…Conical incidence is of interest for the application to display systems [19,23]. We have studied the diffraction efficiency of the POLICRYPS grating at conical incidence (the plane of incidence not perpendicular to the grating, i.e.…”

Section: Conical Incidencementioning

confidence: 99%

Characterization of the diffraction efficiency of polymer-liquid-crystal-polymer-slices gratings at all incidence angles

Xu¹,

Sio²,

Caputo³

et al. 2008

Opt. Express

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Abstract:Recently, a novel holographic diffraction grating made of polymer slices alternated to homogeneous films of nematic liquid crystal (POLICRYPS) was realized. We study the optical performance of the POLICRYPS gratings by both numerical simulations and experiments. Characterization of the grating at normal and conical reading mount are performed. The diffraction efficiency depends strongly on the angles of incidence. Besides, the characterization of the diffraction efficiency at Bragg angle incidence is studied. A uniform high diffraction efficiency is achieved when the incident wave satisfies the Bragg condition.

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“…The HCPLS not only concentrates the emitting light toward the observer (i.e. normal direction) to avoid waste of energy, but also aids achieving some advanced functions such as polarized emitting-light, color separation, and local dimming to greatly raise energy efficiency [5][6][7][8]. Furthermore, the HCPLS can increase contrast of the LCD and benefit 3D application [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

A slim apparatus of transferring discrete LEDs’ light into an ultra-collimated planar light source

Teng¹,

Sun²,

Tseng³

et al. 2013

Opt. Express

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In this paper, we proposed a novel apparatus, which has very slim volume and can transfer light emitted from discrete LEDs into a uniform and ultra-collimated planar light source (UCPLS). This apparatus adopts the two-layer folded frame and two-stage CPC design so that thickness of the entire apparatus can be minimized; especially the feeder in the two-stage CPC design can greatly reduce the thickness of the CPC and make the light passing through the second-stage CPC become much more collimated. In addition, by side-by-side arrangement, a large-sized UCPLS can also be obtained. In our embodiment with an emitting area of the upper LGP of 280 mmX80 mm and a LED with optical flux of 8 lumens used as the light source, the performance according to the related simulation results shows as follows: angular FWHM of the resultant light emitted from the apparatus in the vertical and horizontal is 4.87 degrees and 24 degrees, respectively; spatial uniformity and total energy efficiency reach 84% and 69%, respectively; the average head-on luminance reaches up 5600 nit, yet this apparatus consumes just 60 mW. Furthermore, the results also demonstrate this design has potential to be applied to the product of 23 inches above while thickness of the entire apparatus is only 2.2 mm.

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Simulations of birefringent gratings as polarizing color separator in backlight for flat-panel displays

Cited by 18 publications

References 9 publications

Review Paper: Diffractive backlight technologies for mobile applications

Review Paper: Diffractive backlight technologies for mobile applications

Characterization of the diffraction efficiency of polymer-liquid-crystal-polymer-slices gratings at all incidence angles

A slim apparatus of transferring discrete LEDs’ light into an ultra-collimated planar light source

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