Light adjustment device

Patent metadata

Field	Value
Publication number	US-2023384640-A1
Application number	US-202318231915-A
Country	US
Kind code	A1
Filing date	Aug 9, 2023
Priority date	Feb 25, 2021
Publication date	Nov 30, 2023
Grant date	—

Abstract

A light adjustment device includes a plurality of liquid crystal cells each including a light adjustment region that polarizes light emitted from a light source, the liquid crystal cells being stacked in a direction in which the light is emitted. The liquid crystal cells each include a first substrate in which a plurality of first metal wires are provided, and a second substrate in which a plurality of second metal wires are provided and that sandwiches a liquid crystal layer with the first substrate.

First claim

What is claimed is:

1 . A light adjustment device comprising a plurality of liquid crystal cells each including a light adjustment region that polarizes light emitted from a light source, the liquid crystal cells being stacked in a direction in which the light is emitted, wherein
the liquid crystal cells each include
a first substrate in which a plurality of first metal wires are provided, and
a second substrate in which a plurality of second metal wires are provided and that sandwiches a liquid crystal layer with the first substrate,
the first metal wires are provided at intervals in a wiring layer on the first substrate, the second metal wires are provided at intervals in a wiring layer on the second substrate, and across the entire surface of a peripheral region outside the light adjustment region of at least one of the liquid crystal cells, light is blocked at gaps between the first metal wires by the second metal wires in the direction in which the light is emitted, and light is blocked at gaps between the second metal wires by the first metal wires in the direction in which the light is emitted.

2 . The light adjustment device according to claim 1 , comprising a plurality of combinations of stacked liquid crystal cell for p-wave polarized light and liquid crystal cell for s-wave polarized light.

3 . The light adjustment device according to claim 1 , wherein across the entire surface of the peripheral region outside the light adjustment region of one liquid crystal cell closer to a light emission target among the liquid crystal cells, light is blocked at the gaps between the first metal wires by the second metal wires in the direction in which the light is emitted, and light is blocked at the gaps between the second metal wires by the first metal wires in the direction in which the light is emitted.

4 . A light adjustment device in which a plurality of liquid crystal cells each including a light adjustment region that polarizes light emitted from a light source are stacked in a direction in which light is emitted, wherein
the liquid crystal cells each include
a first substrate, and
a second substrate sandwiching a liquid crystal layer with the first substrate, and
across the entire surface of a peripheral region outside the light adjustment region of at least one of the liquid crystal cells, a light-shielding layer is provided on a substrate closer to a light emission target among the first and second substrates.

5 . The light adjustment device according to claim 4 , comprising a plurality of combinations of stacked liquid crystal cell for p-wave polarized light and liquid crystal cell for s-wave polarized light.

6 . The light adjustment device according to claim 4 , wherein across the entire surface of the peripheral region outside the light adjustment region of one liquid crystal cell closer to a light emission target among the liquid crystal cells, a light-shielding layer is provided on a substrate closer to the light emission target among the first and second substrates.

Assignees

• Japan Display Inc

Inventors

• Ochiai Takahiro
• Takeuchi Shunpei
• Kobayashi Osamu
• Morimoto Hiroya
• Koito Takeo
• Nagao Koichi

Classifications

• G02F1/1347 Primary

  Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells · CPC title

• G02F1/136209

  Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element · CPC title

• G02F1/0136 Primary

  for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation (G02F1/0353 takes precedence) · CPC title

• G02F1/13629

  Multilayer wirings · CPC title

• G02F1/133545

  Dielectric stack polarisers · CPC title