Color-Matching Liquid Crystal Display using a Lenticular Lens Array and RGB Light Sources

Jeon, Hwa Joon; Park, Gyeung-Ju; Gwag, Jin Seog; Lee, Jong Hoon; Kwon, Jin Hyuk

doi:10.3807/josk.2014.18.4.345

Cited by 3 publications

(2 citation statements)

References 12 publications

(10 reference statements)

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“…The approaches involved with geometrical optics use the geometric optical element such as a huge lenticular lens, a wedge-shaped light-guide plate (LGP) with a spherical thick end, or three independent collimating elements, to produce the required angularly separated collimated primaries that then focus onto the corresponding subpixels through a lenticular lens array [26]- [28]. Another approach applied in a direct-lit backlight is using a lenticular lens array with grouped lens elements to focus the linear light sources of the three primaries onto the corresponding subpixels directly [29]. As compared with the diffractive-optics approach, the geometrical-optics approach has no contradiction between angular separation and optical efficiency.…”

Section: Introductionmentioning

confidence: 99%

Integrating Backlight With Color-Filter-Free Panel for Enhancing Performance of LCD

Teng

Sun

2020

IEEE Photonics J.

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In this study, we proposed an innovative concept of integrating a polarized color-separating backlight with a color-filter-free LC panel for enhancing performance of the curved LCD system. We design a two-level folded backlight to exploit the light sources LEDs with color enhancement by quantum-dot technology to produce color beams emerging at separate angles with a linearly polarizing state. The integrated LC panel focuses the separating color beams onto the corresponding subpixels with no need of the color filter; redirects the color beams at respective angles into the normal and reforms their angular shapes to be identical for attaining good color uniformity in the viewing cone. We established a system model for simulation to evaluate its performance. According to the simulation results, it performs the high optical efficiency of 33.75% that is about four times the traditional LCD, and displays color gamut of 94.1% NTSC (CIE 1931). It also provides the illuminance uniformity of 90% above and good color uniformity in both the spatial space and angular space of the viewing cone with horizontal and vertical angular widths of 100 o and 75 o , respectively. Furthermore, the simulation results demonstrate that the design can apply to a 55-inch curved LCD and further extend the maximum diagonal size up to 88 inches while keeping slim volume with a minimal thickness of 6.5 mm.

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Section: Introductionmentioning

confidence: 99%

Integrating Backlight With Color-Filter-Free Panel for Enhancing Performance of LCD

Teng

Sun

2020

IEEE Photonics J.

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“…[4] Especially the white pattern used in the color-matching LCD requires both a high reflectance and a fine structure of a few tens of microns. [5] The color-conversion materials, such as phosphors and quantum dots that convert blue light from the LEDs to red and green light, fluoresce in all directions, so it is necessary to redirect and gather the dispersed fluorescent light in the preferred direction to enhance the conversion efficiency, by using a reflective white pattern into which the color conversion materials have been filled. However, it is very difficult to fabricate a three-dimensional reflective structure with white resin using conventional photolithography, because of the light scattering and reflection by the beads included in the white resin.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Three-Dimensional Reflective White Pattern using Dry-Film Resist

Jun

Kwon

et al. 2015

Journal of the Optical Society of Korea

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White reflective patterns are very difficult to fabricate, due to the scattering and reflection of light, especially when the pattern size goes down to micron size. A reflective white barrier structure of height 50 μm and width 80 μm was fabricated using dry-film resist as an intermediate reverse pattern. The reverse dry-film resist pattern was coated with an SiO2 layer by sputtering, to protect the resist from chemical attack by the radical molecules in UV white resin. The UV white resin was applied on the dry-film resist pattern and then cured with ultraviolet light. The fine three-dimensional reflective patterns were finished by removing the dry-film resist.

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Planar apparatus for uniformly emitting light with angular color-separation

Teng

Tseng

2015

Opt. Express

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This study proposes a slim planar apparatus that can function as a color-separation backlight for the color-filter-free liquid-crystal display (LCD) system. It has a two-level folded configuration comprising a composite light-guide plate (LGP) and light-emitting diode (LED) couplers. The LED couplers generate the highly collimated beams of the three primaries (R, G, and B) that enter the composite LGP at their separate angles; then the three primaries were uniformly extracted out of the top surface of the LGP at their respective angles differing in the longitudinal direction. In the simulation, a lenticular lens array was used to focus the three primaries onto their respective subpixels; each pixel of the LC panel comprised three subpixels, identical to the traditional layout. The proposed apparatus can be applied in backlight modules with a maximal diagonal dimension of 39 inches and a thickness of 15.5 mm. The simulation results indicated that the spatial uniformities of the three primaries ranged between 84% and 87%, the area of the color gamut of the LCD system was 99.5% of that defined by the National Television System Committee, and the total optical efficiency was 41%, as the double of a traditional LCD system. Thus, the proposed apparatus improved the total optical efficiency markedly and provided the LCD system with a wide color gamut.

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Color-Matching Liquid Crystal Display using a Lenticular Lens Array and RGB Light Sources

Cited by 3 publications

References 12 publications

Integrating Backlight With Color-Filter-Free Panel for Enhancing Performance of LCD

Integrating Backlight With Color-Filter-Free Panel for Enhancing Performance of LCD

Fabrication of Three-Dimensional Reflective White Pattern using Dry-Film Resist

Planar apparatus for uniformly emitting light with angular color-separation

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