The patent's assignee for patent number 8730432 is
News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to a liquid crystal display device, and in particular relates to a liquid crystal display device with a unitary optical film.
"Liquid crystal display devices are already widely used in all kinds of electronic devices, such as LCD TVs and computers. Key advantages are low electricity consumption, low driving voltage, and the possibility of achieving lighter weight and thinner volume. However, the liquid crystal display panel in the liquid crystal display device cannot emit light by itself, and has to pair with a back light unit to light the screen evenly.
"Please refer to FIG. 1. FIG. 1 shows a side view of the conventional liquid crystal display device 1 utilizing an edge-light type back light unit. The liquid crystal panel module 40 is disposed in front of the back light unit 10, wherein the back light unit comprises: a light-emitting unit 11, a light guide panel 12, a lower diffusion plate 13, a prism sheet 14, and an upper diffusion plate 15.
"The light guide panel 12 guides the light beam emitted from the light-emitting unit 11 to the lower diffusion plate 13. The lower diffusion plate 13 then disperses and hazes the light beam coming from the light guide panel 12 and distributes the brightness evenly. Nevertheless, the brightness within the effective viewing angle is reduced drastically due to the lower diffusion plate 13.
"In order to solve this problem, the prism sheet 14 receives the light beam that passes through the lower diffusion plate 13 and converges the emergent angle of the incident light beam to strengthen brightness within the effective viewing angle. The prism sheet 14 is a commonly sold brightness enhancement film, with a 90.degree. apex angle, and prism sheet 14 curving towards the liquid crystal panel module 40.
"Finally, the light beam is dispersed and hazed again through the upper diffusion plate 15 in order to provide a uniform light beam to the liquid crystal panel module 40 situated in front.
"However, the above-mentioned back light unit needs at least three individually manufactured optical films, each requiring its own substrate material, which yield a high production cost.
"Furthermore, the air layer formed between the upper diffusion plate and the prism sheet will cause a portion of the light beam to fully reflect from the prism sheet and render it unable to be projected into the upper diffusion plate. The strength of the light beam will be consumed with the increased length thus weakening the overall brightness. Conventionally, in order to increase the brightness of the back light unit it is necessary to raise the light source power of the light-emitting element, but this also means accelerated energy consumption.
"In this regard, a liquid crystal display device with a unitary optical film came into high demand."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "In order to overcome the problems of the prior art of multilayer optical film, this invention provides the below-optical film and the liquid crystal display device using such optical film with the goal of reducing the number of optical films used.
"As one of the objectives, this invention provides an optical film, which includes a substrate, a first transmission medium, second transmission medium, and a reflective polarizing film. The first transmission medium is disposed at the front surface of the substrate and comprises a plurality of embossed microlenses. The second transmission medium is disposed at the rear surface of the substrate and comprises a plurality of V-shaped prisms. The reflective polarizing film is disposed at the front surface of the first transmission medium. The substrate, the first transmission medium, and the second transmission medium are bounded to each other to form a unitary sheet.
"Another objective of this invention is to provide a liquid crystal display device, which includes a liquid crystal panel module, a light guide panel, a light-emitting element, and the above-mentioned optical film. The light guide panel includes a light-emitting surface adjacent to the rear surface of the liquid crystal panel module, and a light incident surface with an adjacent corresponding light-emitting surface. The light-emitting element faces the light incident surface of the light guide panel. The optical film is disposed on the light-emitting surface of the light guide panel or the rear surface of the liquid crystal panel module.
"Yet another objective of this invention is to provide a manufacturing method for the above-mentioned optical film, which includes providing a substrate, and coating a light curing resin on the upper and lower surface of the substrate; providing two patterned rollers, and disposing the substrate between the two patterned rollers, whereby the two patterned rollers press on the light curing resin simultaneously to produce a specific pattern on the surface of the light curing resin. Lastly, providing a light beam to cure the light curing resin.
"The optical film of the invention is a unitary sheet, not only reducing cost, but also improving the deficiencies found in the multilayer optical film of the prior art."
For additional information on this patent, see: Wang, Tzu-Chang; Mao, Li-Wei; Chang, Hsin-Wen; Chen, Yen-Liang. Optical Film and Method for Manufacturing the Same and Liquid Crystal Display Device Using the Same. U.S. Patent Number 8730432, filed
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