Electrically-driven liquid crystal lens and stereoscopic display device using the same

Abstract

Disclosed are an electrically-driven liquid crystal lens which includes a light shade to be switched on / off according to whether or not voltage is applied so as to reduce a cell gap of a liquid crystal layer, and a stereoscopic display device using the same. The electrically-driven liquid crystal lens includes first and second substrates opposite each other and each including plural lens regions and a light shade provided at a boundary of each lens region, first electrodes formed in a given direction on the first substrate in each lens region, a second electrode formed on the second substrateand having an aperture corresponding to the light shade, first and second light shade switching electrodes formed at the light shade and extending parallel to the first electrodes, a liquid crystal layer between both the substrates, and a polarizer plate formed above the second substrate and having a first transmission axis.

Description

[0001] This application claims the rights of Korean patent application 2009-0134354 filed on December 30, 2009, and the entire content of the patent application is hereby incorporated by reference. Technical field [0002] The present invention relates to an electrically driven liquid crystal lens, in particular to an electrically driven liquid crystal lens including a photomask and a stereoscopic display using the lens. The photomask is switched on or off according to whether a voltage is supplied, thereby reducing the liquid crystal layer The box gap. Background technique [0003] At present, services for the rapid dissemination of information based on high-speed information communication networks have evolved from simple "listening and listening" services, such as current telephones, to digital terminals based on high-speed processing of characters, sounds and images. Audiovisual" multimedia services are expected to eventually develop into a three-dimensional information commun...

AI Technical Summary

Problems solved by technology

Therefore, it becomes difficult to form an electrically driven liquid crystal lens with a flat parabolic lens surface having the same effect as an actual lens

[0023] Second, when applied to a large-area display, the central area of ​​the lens away from the edge area of ​​the lens where the electrode to which the high voltage is applied is actually not affected by the electric field, and it is difficult to control the orientation of the liquid crystal with the electric field

If orientation control in the central region of the lens is difficult or impossible when required, the resulting electro-actuated liquid crystal lens has a discontinuous lens profile and is ineffective as a lens

[0024] Third, due to the vertical electric field generated between the electrode to which the high voltage is applied and the electrode formed on the entire surface of the substrate opposite to the high voltage electrode, the electrically driven liquid crystal lens has a high height, that is, a high depression, Moreover, the electrically driven liquid crystal lens also needs a margin of depression up and down, so a large amount of liquid crystal may be required to form the entire electrically driven liquid crystal lens

However, array processing for display panels such as liquid crystal panels forms a cell gap of 10 μm or less, and thus it is difficult to form a large cell gap of the above-mentioned liquid crystal layer

That is, the existing array process for forming a liquid crystal panel is difficult to form the liquid crystal layer of the above-mentioned electrically driven liquid crystal lens.

[0027] Fifth, although Fresnel lenses have been proposed in an effort to reduce the aforementioned cell gap, Fresnel lenses have discontinuities between adjacent sub-regions of the respective lens regions that differ in points of maximum height surface, thus resulting in a degradation of display quality

Images