HEAD-UP DISPLAY DEVICE

• US 20170225568A1
• Filed: 10/13/2015
• Published: 08/10/2017
• Est. Priority Date: 10/16/2014
• Status: Active Grant

• Current Assignee: Nippon Seiki Company Limited
• Original Assignee: Nippon Seiki Company Limited
• Inventors: MATSUURA, Kazuya, KASAHARA, Tsuyoshi, HATANO, Takayuki
• Granted Patent: US 10,549,637 B2
• Time in Patent Office: Days
• CPC Class Codes: B60K 2360/334 Projection means
• CPC Class Codes: B60K 2360/349 Adjustment of brightness
• CPC Class Codes: B60K 2370/155 Virtual instruments
• CPC Class Codes: B60K 2370/334 Projection means
• CPC Class Codes: B60K 2370/349 Adjustment of brightness
• CPC Class Codes: B60K 35/00 Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
• CPC Class Codes: B60K 35/213 Virtual instruments
• CPC Class Codes: G02B 2027/0118 comprising devices for improving the contrast of the display / brillance control visibility
• CPC Class Codes: G02B 27/01 Head-up displays
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/34 by control of light from an independent source
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

The purpose of the present invention is to efficiently orient image light toward an observer. A display device outputs projection light for displaying an image. A transmission type screen forms an image of the projection light and diffuses the same as image light. A projection lens enlarges projection light and forms the image on the transmission type screen. A light distribution adjustment means is disposed between the transmission type screen and the projection lens and adjusts the light distribution of the image light output by the transmission type screen for each region by refracting the projection light.

Claims

1. A head up display device, comprising:

a projector for emitting projection light forming an image;

a screen for allowing an image of the projection light to be formed and diffusing the projection light as image light;

an imaging optical system for enlarging the projection light and forming the image of the projection light on the screen; and

light distribution adjustment means for adjusting light distribution of the image light emitted from the screen in each region by refracting the projection light, the light distribution adjustment means being provided between the screen and the imaging optical system.

2. The head up display device according to claim 1, wherein

the light distribution adjustment means adjusts the image light so that the image light emitted from each region of the screen is directed to an optical axis of the projection light.

3. The head up display device according to claim 1, wherein

the light distribution adjustment means increases an adjustment amount of the projection light as the projection light is separated from an optical axis of the projection light in at least a first direction between the first direction and a second direction, the first direction extending in a direction vertical to the optical axis of the projection light and the second direction extending in a direction vertical to the optical axis of the projection light and orthogonal to the first direction.

4. The head up display device according to claim 2, wherein

the light distribution adjustment means increases an adjustment amount of the projection light as the projection light is separated from an optical axis of the projection light in at least a first direction between the first direction and a second direction, the first direction extending in a direction vertical to the optical axis of the projection light and the second direction extending in a direction vertical to the optical axis of the projection light and orthogonal to the first direction.