US 11,874,577 B2
See-through window display and liquid crystal display
Fumikazu Shimoshikiryoh, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed on Aug. 11, 2022, as Appl. No. 17/886,236.
Claims priority of provisional application 63/238,014, filed on Aug. 27, 2021.
Prior Publication US 2023/0068177 A1, Mar. 2, 2023
Int. Cl. G02F 1/137 (2006.01); G02F 1/1335 (2006.01); G02F 1/1343 (2006.01); G09G 3/36 (2006.01); G02F 1/133 (2006.01); G02F 1/13363 (2006.01)
CPC G02F 1/13712 (2021.01) [G02F 1/13306 (2013.01); G02F 1/133514 (2013.01); G02F 1/133531 (2021.01); G02F 1/134345 (2021.01); G09G 3/3607 (2013.01); G09G 3/3614 (2013.01); G02F 1/133638 (2021.01); G02F 1/134363 (2013.01); G02F 1/134372 (2021.01); G02F 2201/52 (2013.01); G02F 2203/01 (2013.01); G02F 2203/30 (2013.01); G02F 2203/66 (2013.01); G02F 2413/02 (2013.01); G02F 2413/08 (2013.01); G09G 2300/0452 (2013.01); G09G 2300/0823 (2013.01); G09G 2330/021 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A see-through window display comprising:
a display panel having a plurality of pixels; and
a drive circuit configured to apply a voltage according to input gray scale data to the plurality of pixels,
wherein the display panel includes:
a first substrate having a pixel electrode,
a second substrate,
a liquid crystal layer interposed between the first substrate and the second substrate,
a first polarizer provided on the first substrate, the first polarizer having a first polarization axis, and
a second polarizer provided on the second substrate, the second polarizer having a second polarization axis,
when a transmittance of each of the plurality of pixels, when the drive circuit applies a minimum voltage to the plurality of pixels, is set to TW, and when a transmittance of each of the plurality of pixels, when the drive circuit applies a maximum voltage to the plurality of pixels, is set to TB, the display panel has a normally white characteristic satisfying a relationship of TW>TB, and
the normally white characteristic of the display panel has a structure in which, when:
a first axis that is parallel to an axis created by rotating the first polarization axis 45 degrees clockwise is set to an a-axis,
a second axis that is parallel to an axis created by rotating the first polarization axis 45 degrees counterclockwise is set to a b-axis,
an a-axis component of a refractive index of the liquid crystal layer is set to ‘na’ and a b-axis component of a refractive index of the liquid crystal layer is set to ‘nb’, and
a value indicating anisotropy of the refractive index of the liquid crystal layer being a difference between a refractive index of the a-axis component and a refractive index of the b-axis component is set to Δn=|na−nb|,
a first value of Δn when the voltage applied to the plurality of pixels by the drive circuit is lower than or equal to a threshold voltage indicating a boundary of alignment change of liquid crystal molecules of the liquid crystal layer is smaller than a second value of Δn when the voltage applied by the drive circuit is higher than the threshold voltage.