KR20180101001A - Screen structure of optical device for projector type-head up display and optical device for projector type-head up display including the screen structure - Google Patents

Abstract

INDUSTRIAL APPLICABILITY The present invention provides a screen structure of an optical device for a projector-type head-up display capable of preventing the brightness and the brightness of the projected image from being lowered without addition of a peripheral configuration, achieving downsizing and cost reduction, And more particularly to an optical device for a head-up display. According to the present invention, there is provided a screen structure of an optical apparatus for a head-up display (HUD), said screen structure comprising: a base body; And a scattering surface configured to be rounded on one surface of the base body and having a scattering characteristic in which light is scattered, wherein a screen structure of an optical apparatus for a head-up display is provided, the projector comprising: a projector for generating an image source; A screen structure for reflecting an image from the projector, the screen structure comprising a base body of a predetermined shape and a scattering surface formed on one surface of the screen body and having a scattering characteristic in which light is scattered; And a mirror for reflecting the image from the screen structure.

Description

TECHNICAL FIELD [0001] The present invention relates to a screen structure of an optical device for a projector type head-up display, and an optical device for a projector type head-up display including the projector type head-up display. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] }

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen structure of an optical device for a projector type head-up display and an optical device for a projector type head-up display including the same, and more particularly, And to an optical apparatus for a projector type head-up display including the screen structure of an optical apparatus for a projector type head-up display capable of achieving miniaturization and cost reduction and securing visibility at a peripheral portion.

In general, the Head Up Display (HUD) displays information and driving information of a vehicle through a wind shield positioned in front of the driver to minimize the driver's gaze movement during operation, To provide information.

The configuration of such a head-up display has an image source such as a liquid crystal display (LCD) or a projector for generating an image, and an image generated from such an image source is projected onto an appropriate distance, And an interface part for controlling the driver.

1 is a view schematically showing a configuration of a projector type head-up display according to the prior art.

1, a projector type head-up display according to the prior art projects an image source from a projector 10 onto a screen 20 and displays it on a windshield 40 via an aspherical mirror 30 .

The conventional projector type head-up display using such a projector 10 and the screen 20 requires a minimum projection distance of the projector, which requires a physical space between the projector 10 and the screen 20, The size of the Picture Generation Unit (PGU) increases, and as the field of view (FOV) and brightness of the HUD become higher specifications, the projector size increases proportionally.

However, in the conventional projector type head-up display, efficiency of the system is increased by arranging the beam-oriented point of the virtual image optical system and the beam starting point of the projection lens similarly. In the virtual image system of large magnification, when the shape of the screen becomes concave, There is a problem that the probability of occurrence of interference increases because it is close to the screen.

In addition, when a film is adhered to a curved base, it is difficult to uniformly adhere the film to the surface, which results in a low yield and requires a special lamination equipment.

(Document 1) Korean Patent Registration No. 10-1491435 (Registered on Feb. 23, 2013) (Document 2) Korean Patent Laid-Open Publication No. 10-2016-0090519 (published on August 1, 2016) (Document 3) Korean Patent Registration No. 10-1994-0000594 (published on Jan. 26, 1994)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is therefore an object of the present invention to provide a projector capable of reducing the brightness and brightness of a projected image, It is an object of the present invention to provide a screen structure of an optical apparatus for a head-up display and an optical apparatus for a projector-type head-up display including the same.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and method for controlling the same.

According to one aspect of the present invention, there is provided a screen structure of an optical apparatus for a head-up display (HUD), the screen structure comprising: a base body; And a scattering surface formed on one surface of the base body and having a scattering property of scattering light.

In one aspect of the present invention, the screen structure may be formed of any one of a spherical body on which the scattering surface is formed, an aspherical surface block body, and a cylindrical block body.

In one aspect of the present invention, the screen structure may be formed of a scattering film that forms the scattering surface to scatter light.

In one aspect of the present invention, the scattering angle distribution on the scattering surface has a different scattering angle distribution.

According to another aspect of the present invention, there is provided a projector comprising: a projector for generating an image source; A screen structure for reflecting an image from the projector, the screen structure comprising a base body of a predetermined shape and a scattering surface formed on one surface of the screen body and having a scattering characteristic in which light is scattered; And a mirror for reflecting the image from the screen structure.

In another aspect of the present invention, the screen structure may be formed of any one of a spherical body on which the scattering surface is formed, an aspherical block body, and a cylindrical block body.

According to another aspect of the present invention, the screen structure may be formed of a scattering film formed so that the scattering surface scatters light.

According to another aspect of the present invention, the scattering angle distribution on the scattering surface has a different scattering angle distribution.

The screen structure of the optical device for the projector type head-up display and the optical device for the projector type head-up display including the screen structure according to the present invention provide the following effects.

First, the HUD module can be miniaturized without degrading the system brightness and luminance uniformity in terms of performance improvement, and there is no need to use an additional light source to compensate for the decrease in peripheral luminance, thereby contributing to reduction in the number of components.

Second, the system brightness and luminance uniformity can be improved without additional components, simplifying the process and optimizing the screen shape, thereby contributing to weight reduction since no additional components are used.

Third, the luminance uniformity at the peripheral portion is increased, thereby improving the visibility of the driving information during driving, thereby improving the convenience for the driver.

Fourth, luminance uniformity can be improved by minimizing the design change in the conventional structure without using additional light sources or optical parts, thereby contributing to cost reduction.

The effects of the present invention are not limited to those mentioned above, and other solutions not mentioned may be clearly understood by those skilled in the art from the following description.

1 is a view schematically showing a configuration of a projector type head-up display according to the prior art.
Fig. 2 is a schematic view showing an optical apparatus for a projector type head-up display including a screen structure having a scattering angle adjusting reflecting surface according to the present invention.
3 is a view showing a beam pupil of an optical system formed by an optical device for a projector type head-up display including a screen structure having a scattering reflecting surface according to the present invention.
4 is a configuration diagram showing a screen structure of a first embodiment constituting an optical device for a projector type head-up display including a screen structure having a scattering reflecting surface according to the present invention.
5 is a view showing a modification of the first embodiment constituting the optical device for a projector type head-up display including the screen structure having the scattering angle adjusting reflecting surface according to the present invention.
6 is a view showing a second embodiment of an optical apparatus for a projector type head-up display including a screen structure having a scattering angle adjusting reflecting surface according to the present invention.
7 is a view showing a modification of the second embodiment constituting the optical device for the projector type head-up display including the screen structure having the scattering angle adjusting reflecting surface according to the present invention.
8 is a view showing scattering angle characteristics according to the same scattering characteristics in the screen structure according to the present invention.
9 is a view showing a beam-oriented point of a virtual image optical system in an optical apparatus of a head-up display of a conventional configuration.
10 is a view for explaining generation of an interference area of the projector in the virtual image optical system of Fig.
Fig. 11 is a view for explaining the influence of inconsistency of the beam-oriented point by the screen member in the optical apparatus of the head-up display of the conventional configuration.

Further objects, features and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

Before describing the present invention in detail, it is to be understood that the present invention is capable of various modifications and various embodiments, and the examples described below and illustrated in the drawings are intended to limit the invention to specific embodiments It is to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Also, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation, Software. ≪ / RTI >

In the following description with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and a duplicate description thereof will be omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

A projector type head-up display optical device including a screen structure having a scattering angle adjusting reflecting surface, which will be described below, is configured to avoid a interference by a reflected beam by arranging a convex-shaped screen structure and to avoid a beam pupil position To eliminate the system efficiency degradation factor due to the adjustment of the screen scattering angle.

Hereinafter, an optical apparatus for a projector type head-up display including a screen structure having a scattering angle adjusting reflecting surface according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic view showing an optical device for a projector type head-up display including a screen structure having a scattering angle adjusting reflecting surface according to the present invention, FIG. 3 is a schematic view showing a screen structure having a scattering reflecting surface according to the present invention 1 is a diagram showing a beam pupil of an optical system formed by an optical device for a head-up display including a projector type.

An optical apparatus for a projector type head-up display including a screen structure having a scattering angle adjusting reflecting surface according to the present invention includes a projector 100 for generating an image source, as shown in Figs. 2 and 3; A screen structure (200) configured so that an image from the projector (100) is imaged and scattered and reflected; And an aspherical mirror 300 that enlarges and projects an image from the screen structure 200 to reflect a virtual image to the windshield or beyond the windshield. Reference numeral 400 denotes a dust cover for covering the upper portion of the screen structure 200 and the aspherical surface mirror 300 to prevent dust or the like from entering the screen structure 200.

Here, the present invention may further include one or more folding mirrors (not shown) provided between the aspherical mirror and the reflective screen according to the layout of the head-up display system. In other words, the folding mirror may be constructed in accordance with the layout of the optical device so as to sequentially reflect the reflected or transmitted image in the windshield direction while changing the reflection angle.

The projector 100 includes an illumination optical system including a light source such as an LED or a laser and a small panel such as a DMD, an LCOS, and a scanner. The image information generated by the panel is projected by the projection lens 200 ).

The screen structure 200 is a component of an optical system that transmits image information to an aspherical mirror 300 using a reflection scattering property of a surface at a point where an image sent from the projector 100 is focused. This screen structure 200 is described in greater detail below as a key feature of the present invention.

The aspheric mirror 300 is an optical means for magnifying and projecting the image of the screen structure 200 to make a virtual image appear beyond the windshield.

The screen structure 200, which is a main feature of the present invention, will be described in detail with reference to the accompanying drawings.

4 is a configuration diagram showing a screen structure of a first embodiment constituting an optical device for a projector type head-up display including a screen structure having a scattering reflecting surface according to the present invention.

As shown in FIG. 4, the screen structure 200 may include a spherical or aspherical block body having a scattered surface 201 on which a rounded surface is scattered.

5 is a view showing a modification of the first embodiment constituting the optical device for a projector type head-up display including a screen structure having a scattering angle adjusting reflecting surface according to the present invention, wherein a rounded surface is a light scattering scattering And a surface 201 of a cylindrical block body.

In the screen structure of this first embodiment, the scattering surface 201 is made to have the same scattering angle characteristics in all aspects.

6 is a view showing a second embodiment of an optical apparatus for a projector type head-up display including a screen structure having a scattering angle adjusting reflecting surface according to the present invention.

As shown in FIG. 6, the screen structure according to the second embodiment includes a base body 210 having a rounded surface made of a spherical surface or an aspherical surface, and a base body 210 having rounded surfaces of the base body 210, And a scattering scattering film 220 for scattering light.

7 is a view showing a modification of the second embodiment constituting the optical device for a projector type head-up display including a screen structure having a scattering angle adjusting reflecting surface according to the present invention, And a laminated scattering film 220 provided on the rounded surface of the base body 210 through adhesion or bonding to scatter light.

Here, the laminated scattering film 220 in the second embodiment and its modifications is made to have the same scattering characteristics in all aspects. For example, in the laminated scattering film 200, scattering angle distributions of the central portion and the both side portions have different scattering angle distributions, so that the same scattering characteristics are obtained on the scattering surfaces as shown in Fig.

8 is a view for explaining a case where scattering angle characteristics are uniform and nonuniform in scattering angle characteristics in a screen structure according to the present invention.

In other words, in general, the scatterer has a uniform scattering characteristic as shown in the left-hand side of FIG. 8. When the scattering angle distribution is uniform on the reflection surface of the screen structure 200 according to the present invention, The light scattering characteristics of the reflective surface 200 formed on the reflective surface become uniform, and the luminance uniformity and image quality are somewhat deteriorated.

In view of this, the present invention differs from the scattering characteristics of the screen structure 200 formed in a round shape by making the scattering angle distribution of the central part and both sides of the laminated scattering film 200 nonuniform, as shown in the right side of FIG. 8 The luminance uniformity and the quality of the image can be improved.

The operation and effect of the projector-type head-up display optical device including the screen structure having the above-described scattering angle-adjusting reflecting surface according to the present invention will be described with reference to Figs. 9 to 11. Fig. FIG. 9 is a view showing a beam directing point of a virtual image optical system in an optical apparatus of a conventional head-up display, FIG. 10 is a view for explaining generation of an interference region of the projector in the virtual image optical system of FIG. 9, Fig. 5 is a view for explaining the influence of inconsistency of a beam-oriented point by a screen member in an optical apparatus of a head-up display.

 As the demand for the head-up display of recent high-specification increases, the field-of-view (FOV) increases and the size of the head-up display module becomes larger.

However, since the mounting space of the head-up display module is limited, a means for solving the problem is needed. In one method, the distance between the aspheric mirror and the screen member can be shortened by increasing the magnification of the virtual image optical system.

In this case, the pupil of the virtual image system is also shortened. In the case of the structure using the reflective screen, interference occurs between the reflected scattered beam and the projector as shown in FIGS. 9 and 10.

In this way, the projector can be disposed outside the interference region to avoid interference between the reflected scattered beam and the projector, but it is impossible to match the room temperature and the pupil of the projector due to the interference, The same low brightness area occurs.

As a result, luminance unevenness is reduced at the periphery of the eye box. To solve this problem, the scattering angle of the screen must be increased, which decreases the overall brightness and reduces the system efficiency.

The present invention is characterized in that a screen structure in the form of a one-sided convex lens with a scattering surface having a scattering characteristic is disposed on a rounded surface to avoid interference by a reflected beam as shown in Fig. 3, By adjusting the position of the screen, it is possible to eliminate the system efficiency degradation factor by adjusting the screen scattering angle.

The optical apparatus for a head-up display including the screen structure according to the present invention as described above can downsize the HUD module without deteriorating the system brightness and luminance uniformity, and it is necessary to use an additional light source It can contribute to reduction in the number of components and can improve the system brightness and luminance uniformity without increasing the number of parts, simplifying the process, and advantageously contributing to weight reduction because no additional parts are used due to optimization of the screen shape.

Further, the present invention improves the visibility of the driving information during driving by improving the luminance uniformity at the peripheral portion, thereby improving the convenience for the driver. Further, in the conventional structure, Since the uniformity can be improved, there is an advantage that it can contribute to cost reduction.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Therefore, it is to be understood that the embodiments disclosed herein are not for purposes of limiting the technical idea of the present invention, but rather are not intended to limit the scope of the technical idea of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Projector
200: Screen structure
201: scattering surface
210: Base body
220: laminated scattering film
300: Aspherical mirror
400: dust cover

Claims (12)

A screen structure of an optical apparatus for a head-up display (HUD)
The screen structure includes:
Base body; And
And a scattering surface formed on one surface of the base body and having a scattering characteristic for scattering light,
A screen structure of an optical device for a head-up display.
The method according to claim 1,
The screen structure
And a spherical body on which the scattering surface is formed
A screen structure of an optical device for a head-up display.
The method according to claim 1,
The screen structure
And an aspherical block body on which the scattering surface is formed
A screen structure of an optical device for a head-up display.
The method according to claim 1,
The screen structure
And a cylindrical block body on which the scattering surface is formed
A screen structure of an optical device for a head-up display.
The method according to claim 1,
The screen structure
Wherein the scattering surface comprises a scattering film formed so as to scatter light
A screen structure of an optical device for a head-up display.
6. The method according to any one of claims 1 to 5,
Characterized in that the scattering angle distribution on the scattering surface has a different scattering angle distribution
A screen structure of an optical device for a head-up display.
A projector for generating an image source;
A screen structure for reflecting an image from the projector, the screen structure comprising a base body of a predetermined shape and a scattering surface formed on one surface of the screen body and having a scattering characteristic in which light is scattered; And
And a mirror for reflecting the image from the screen structure
Optical device for head-up display.
8. The method of claim 7,
The screen structure
And a spherical body on which the scattering surface is formed
Optical device for head-up display.
8. The method of claim 7,
The screen structure
And an aspherical block body on which the scattering surface is formed
Optical device for head-up display.
8. The method of claim 7,
The screen structure
And a cylindrical block body on which the scattering surface is formed
Optical device for head-up display.
8. The method of claim 7,
The screen structure
Wherein the scattering surface comprises a scattering film formed so as to scatter light
Optical device for head-up display.
12. The method according to any one of claims 7 to 11,
Characterized in that the scattering angle distribution on the scattering surface has a different scattering angle distribution
Optical device for head-up display.

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