US 12,228,834 B2
Light control device, management method for light control device, and production method for light control device
Takehiro Yamada, Taito-ku (JP); and Yusuke Higashi, Taito-ku (JP)
Assigned to TOPPAN PRINTING CO., LTD., Tokyo (JP)
Filed by TOPPAN PRINTING CO., LTD., Tokyo (JP)
Filed on Nov. 16, 2020, as Appl. No. 17/098,869.
Application 17/098,869 is a continuation of application No. PCT/JP2019/019266, filed on May 15, 2019.
Claims priority of application No. 2018-094150 (JP), filed on May 15, 2018.
Prior Publication US 2021/0072572 A1, Mar. 11, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G02F 1/137 (2006.01); E06B 9/24 (2006.01); G01N 1/28 (2006.01); G01N 21/59 (2006.01); G02F 1/13 (2006.01); G02F 1/1343 (2006.01)
CPC G02F 1/137 (2013.01) [E06B 9/24 (2013.01); G01N 1/28 (2013.01); G01N 21/59 (2013.01); G02F 1/1309 (2013.01); G02F 1/13439 (2013.01); E06B 2009/2417 (2013.01); E06B 2009/2464 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A light control device, comprising:
a light control sheet comprising a light control layer and a plurality of transparent electrode layers sandwiching the light control layer such that the light control layer includes liquid crystal molecules and is configured to change alignment of the liquid crystal molecules by application of a drive voltage; and
a controller comprising circuitry configured to control opacity of the light control sheet with multiple levels of gradation by using information for converting each different value of transmitted image definition into a value of the drive voltage,
wherein the light control layer is configured to switch between at least transparent in a first state when the drive voltage is applied and turbid in a second state when the drive voltage is not applied such that the light control sheet has a transmitted image definition of 70% or less in the second state, where the transmitted image definition is based on JIS K 7374:2007 with an optical comb width set to 0.125 mm.