MEMBER FOR DISPLAYING PROJECTED IMAGE AND PROJECTION SYSTEM

• US 20180074315A1
• Filed: 11/21/2017
• Published: 03/15/2018
• Est. Priority Date: 05/29/2015
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: YANAI, Yujiro, YAMAMOTO, Akira, NAGAI, Michio, SAITOH, Yukito, KASHIWAGI, Daisuke, ICHIHARA, Nobuhiko
• Granted Patent: US 10,310,260 B2
• Time in Patent Office: Days
• CPC Class Codes: B60K 2360/334 Projection means
• CPC Class Codes: B60K 35/00 Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
• CPC Class Codes: G02B 2027/0123 comprising devices increasing the field of view
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02B 5/26 Reflecting filters G02B5/28 takes precedence
• CPC Class Codes: G02F 1/13718 based on a change of the texture state of a cholesteric liquid crystal
• CPC Class Codes: G03B 21/60 characterised by the nature of the surface

Abstract

Provided is a member for displaying a projected image, including: a first base material; a second base material; and an optical member, in which at least one optical member is disposed on a surface of the first base material or the second base material, the optical member includes a plurality of cholesteric liquid crystal dots, the cholesteric liquid crystal dot is formed of a liquid crystal material having a cholesteric structure, the cholesteric structure imparts a striped pattern formed of bright portions and dark portions in a cross-sectional image of the cholesteric liquid crystal dot taken by a scanning electron microscope in a direction perpendicular to a substrate, the dot includes a portion where the height thereof successively increases to the maximum height thereof from an end portion toward the center thereof, an angle between a normal line with respect to a line formed by the first dark portion from the surface of the dot on a side opposite to the substrate and a line representing the surface of the is in a range of 70° to 90° in this portion of the cross-sectional image, and a reflection center wavelength of the dot is in a range of 400 to 1000 nm.

Claims

1. A member for displaying a projected image, comprising:

a first base material;

a second base material; and

at least one optical member,

wherein the at least one optical member is disposed on a surface of the first base material or the second base material,

the at least one optical member includes a plurality of cholesteric liquid crystal dots provided on a substrate,

the cholesteric liquid crystal dot is formed of a liquid crystal material having a cholesteric structure,

the cholesteric structure imparts a striped pattern formed of bright portions and dark portions in a cross-sectional image of the cholesteric liquid crystal dot taken by a scanning electron microscope in a direction perpendicular to the substrate,

the cholesteric liquid crystal dot includes a portion where the height thereof successively increases to the maximum height thereof from an end portion toward the center thereof,

an angle between a normal line with respect to a line formed by the first dark portion from the surface of the cholesteric liquid crystal dot on a side opposite to the substrate and a line representing the surface of the cholesteric liquid crystal dot is in a range of 70°

to 90°

in the portion of the cross-sectional image, and

a reflection center wavelength of the cholesteric liquid crystal dot is in a range of 400 to 1000 nm.

2. The member for displaying a projected image according to claim 1,

wherein the member for displaying a projected image is windshield glass,

the at least one optical member is disposed between the first base material and the second base material,

both of the first base material and the second base material are glass,

the at least one optical member has the cholesteric liquid crystal dots provided on the substrate, and

the substrate is a resin film.

3. The member for displaying a projected image according to claim 1, which is used as a combiner of a head-up display.

4. The member for displaying a projected image according to claim 2, which is used as a combiner of a head-up display.

5. Windshield glass comprising the member for displaying a projected image according to claim 1.

6. A combiner of a head-up display, consisting of the member for displaying a projected image according to claim 1.

7. A projection system comprising:

the member for displaying a projected image according to claim 1,

wherein the cholesteric liquid crystal dots are disposed on a side where projection light is incident.

8. A projection system comprising:

the member for displaying a projected image according to claim 2,

wherein the cholesteric liquid crystal dots are disposed on a side where projection light is incident.

9. A projection system comprising:

the member for displaying a projected image according to claim 3,

wherein the cholesteric liquid crystal dots are disposed on a side where projection light is incident.

10. A projection system comprising:

the member for displaying a projected image according to claim 4,

wherein the cholesteric liquid crystal dots are disposed on a side where projection light is incident.