Head-up display device

Patent metadata

Field	Value
Publication number	US-11215821-B2
Application number	US-201816756930-A
Country	US
Kind code	B2
Filing date	Oct 16, 2018
Priority date	Oct 19, 2017
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A head-up display apparatus includes: a display unit configured to output projection light; at least one reflector configured to reflect the projection light; a housing, which has an opening portion, and is configured to store the display unit and the reflector therein; a cover member configured to cover the opening portion; and a polarizing plate with a retardation layer, which is arranged on a housing inner side of the cover member, and includes a retardation layer and a polarizer in the stated order from a cover member side. The retardation layer has an in-plane retardation Re(550) of from 100 nm to 200 nm. The head-up display apparatus is configured so that an angle of reflection of the projection light output from the housing through the opening portion with respect to a windshield is 30° or less, or is 40° or more.

First claim

The invention claimed is:

1. A head-up display apparatus, comprising:
a display unit configured to output projection light;
at least one reflector configured to reflect the projection light;
a housing, which has an opening portion, and is configured to store the display unit and the reflector therein;
a cover member configured to cover the opening portion; and
a polarizing plate with a retardation layer, which is arranged on a housing inner side of the cover member, and includes a retardation layer and a polarizer in the stated order from a cover member side,
wherein the retardation layer has an in-plane retardation Re(550) of from 100 nm to 200 nm, or from 220 nm to 320 nm, and
wherein the head-up display apparatus is configured so that an angle of reflection of the projection light output from the housing through the opening portion with respect to a windshield is 30° or less, or is 40° or more.

2. The head-up display apparatus according to claim 1 , wherein the polarizer contains an aromatic disazo compound represented by the following formula (1):

in the formula (1), Q 1 represents a substituted or unsubstituted aryl group, Q 2 represents a substituted or unsubstituted arylene group, R 1 s each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted acetyl group, a substituted or unsubstituted benzoyl group, or a substituted or unsubstituted phenyl group, M represents a counterion, “m” represents an integer of from 0 to 2, and “n” represents an integer of from 0 to 6, provided that at least one of “m” or “n” does not represent 0, a relationship of 1≤m+n≤6 is satisfied, and when “m” represents 2, the respective R 1 s may be identical to or different from each other.

3. The head-up display apparatus according to claim 1 , wherein the cover member contains a polycarbonate-based resin.

4. The head-up display apparatus according to claim 1 , wherein the cover member has a thickness of from 10 μm to 1,000 μm.

5. The head-up display apparatus according to claim 1 , wherein the polarizer has a thickness of from 100 nm to 1,000 nm.

Assignees

• Nitto Denko Corp

Inventors

• Fuchida Takehito
• Asanoi Yoshiaki
• Takada Katsunori

Classifications

• B60K35/23

  Head-up displays [HUD] (optical aspects of head-up displays G02B27/01) · CPC title

• G02B27/01

  Head-up displays · CPC title

• G02B27/0101 Primary

  characterised by optical features (G02B27/0172 takes precedence) · CPC title

• G02B5/3083

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title

• G02B27/283

  used for beam splitting or combining · CPC title