Head-up display apparatus

Patent metadata

Field	Value
Publication number	US-11650419-B2
Application number	US-201816757006-A
Country	US
Kind code	B2
Filing date	Oct 16, 2018
Priority date	Oct 19, 2017
Publication date	May 16, 2023
Grant date	May 16, 2023

Abstract

Provided is a head-up display apparatus that is excellent in viewability when a display screen is viewed through a pair of polarized sunglasses, and is excellent in heat resistance. The 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 arranged on a housing inner side of the cover member. The cover member has an in-plane retardation Re(550) of 3,000 nm or more. 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 arranged on a housing inner side of the cover member,
wherein the cover member has an in-plane retardation Re(550) of 3,000 nm or more, 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 a polarizer of the polarizing plate 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 2 , wherein the polarizer has a thickness of from 100 nm to 1,000 nm.

6. The head-up display apparatus according to claim 1 , wherein the polarizing plate comprises a protective layer, a polarizer, and a substrate in the stated order from the cover member side.

Assignees

• Nitto Denko Corp

Inventors

• Fuchida Takehito
• Asanoi Yoshiaki
• Takada Katsunori

Classifications

• B60K35/50

  Instruments characterised by their means of attachment to or integration in the vehicle (B60K35/231 takes precedence) · CPC title

• B60K35/28

  characterised by the type of the output information, e.g. video entertainment or vehicle dynamics information; characterised by the purpose of the output information, e.g. for attracting the attention of the driver · CPC title

• B60K35/23

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

• C07C309/50

  having at least one of the sulfo groups bound to a carbon atom of a six-membered aromatic ring being part of a condensed ring system · CPC title

• G02B27/283

  used for beam splitting or combining · CPC title