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High contrast electro-optic liquid crystal camera iris

A camera, high-contrast technology, applied in camera, aperture, optics, etc., to solve problems such as unsatisfactory apertures and low contrast between dual-unit host and guest apertures

Active Publication Date: 2016-07-06
LC显示技术公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Figure 4 shows a small angular change in intermediate transmittance compared to that of the simulated TN stop in Figure 2, but the low contrast of the dual-unit host-guest stop makes it unsatisfactory for use as a camera stop

Method used

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  • High contrast electro-optic liquid crystal camera iris
  • High contrast electro-optic liquid crystal camera iris
  • High contrast electro-optic liquid crystal camera iris

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] Figure 5 is a schematic diagram of a liquid crystal diaphragm 10 configured as a first embodiment of a first embodiment of the disclosed optoelectronic liquid crystal camera diaphragm. The liquid crystal diaphragm 10 includes a first ECB liquid crystal device 12 and a second ECB liquid crystal device 14, each of which contains liquid crystals having positive dielectric anisotropy. For simplicity, labeling to match the coating of each of the ECB liquid crystal devices 12 and 14 is omitted from the figure. ECB liquid crystal devices 12 and 14 have director field 16 consisting of liquid crystal director 18 and director field 20 consisting of liquid crystal director 22, respectively. Figure 5 Each of the director fields 16 and 20 at an intermediate drive voltage V is shown in . Director field 20 of ECB liquid crystal device 14 is a mirror image of director field 16 of ECB liquid crystal device 12 . In other words, the liquid crystal directors 22 in the director field 2...

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PUM

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Abstract

A high-contrast electro-optic liquid crystal camera iris (10) provides angle independent transmission for uniform gray shades. The liquid crystal iris comprises a combination of first and second liquid crystal devices (12, 14) arranged in optical series and positioned between optical polarizers (46, 48). The director field (18) of the second liquid crystal device is a mirror image of the director field (16) of the first liquid crystal device, and the first and second liquid crystal devices are placed together so that the azimuthal directions (42) of the surface-contacting directors (18c, 22c) are in parallel alignment at the adjoining or confronting surfaces of the substrates (242, 321) of the first and second liquid crystal devices. The liquid crystal iris provides, therefore, less angular variation of intermediate transmittances compared with that provided by prior art liquid crystal irises.

Description

[0001] Copyright Notice [0002] 2014LC-TEC Displays AB. Portions of the disclosure of this patent document contain material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction of any patent document or patent disclosure as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyrights whatsoever. 37 CFR §1.71(d). technical field [0003] The present disclosure relates to a liquid crystal diaphragm used for an image recording device such as a camera, and in particular, relates to a liquid crystal diaphragm used for a miniature type camera mounted in a smartphone. Background technique [0004] Conventional cameras use a mechanical iris diaphragm to control the amount of light reaching the recording medium (eg, film or a charge-coupled device (CCD) light sensor array). Mechanical apertures are complex devices that are unsuitable for many miniature camera applications, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357G02F1/1347G02F1/139H04N23/75
CPCG03B7/095G02F1/133634G02F1/13471G02F1/13475G02F1/1393G02F1/1313G02F1/13306G02F1/133512G02F1/1337G02F1/134309G02B5/003G02B5/005G02B5/24G03B9/02G02B27/0988G02F2201/122G02F2203/62G02F1/1396H04M1/0264G02F2203/06G02F1/13706G02F1/1398G02F1/13712
Inventor J·奥斯特曼T·J·谢弗
Owner LC显示技术公司