KR19980014603A - Apparatus and method for preventing phase distortion in HUD optical systems - Google Patents

Abstract

The present invention relates to a HUD optical system, and in the related art, when dust is applied to the front of a windshield, a wavelength to be transmitted through a wavelength of an image projected from the projector is not transmitted but is reflected by dust, And the image of the wavelength reflected by the dust is transmitted at the same time, so that the driver has the drawback of seeing a double image. Accordingly, the present invention can detect the amount of dust on the front surface of the windshield and wipe the front surface of the windshield by activating the wiper when dust of a predetermined amount or more is present, thereby preventing the double-vision from being formed.

Description

Apparatus and method for preventing phase distortion in HUD optical systems

The present invention relates to a HUD optical system employed in automobiles.

In particular, the present invention relates to a HUD optical system for operating a wiper according to the amount of dust accumulated on a front surface of a windshield, thereby removing dust accumulated on a front surface of the windshield, thereby preventing a projected image from being projected from a projector And an image distortion preventing apparatus and method.

In general, the Head Up Display (HUD) is a technology developed for fighter aircraft. The display light is reflected from a translucent reflector placed in front of the cockpit (hereinafter referred to as a combiner) and enters the pilot's eyes. The pilot can simultaneously recognize the information of both sides in the form of a doubly superimposed display form of the forward view through the Combine. Since the display image can be imaged on the infinite origin by the lens system, the time required for the movement of the line of sight and the focus can be shortened. The meaning of the combiner is to combine the front view with the presentation. In a car, a combiner is placed in the instrument under the windshield at the front of the driver's seat, and the driver is reflected to see the virtual image displayed in front of the car. In other words, it is subjected to combine processing by a thin film on the reflection surface portion (indoor side) of the windshield. The contents displayed on the HUD are selected as a simple digital display and master warnings of the projector as a supplement to the contents displayed on the original projector.

HUD is to instantly read the front view and the overlapping display image to the driver. Unlike the case of the aircraft, the front view of the automobile has many changes. To improve the identification of the display, the reflectance at the windshield reflector However, the windshield must have a transmittance of 70% or more in order to secure a front view. In order to establish this contradiction at the same time, an interference signal is generated by applying a hologram for the purpose of improving the identification of the display image by effectively using a limited reflectance. This is called a hologram. When the light is irradiated by the hologram, the wavelength selection by the diffraction action of the light according to the interference call and the lens or concave mirror effect can be obtained. In other words, the phase-aligned light emitted from the laser is divided into two, and the plane wave and the spherical wave are generated and projected from both sides of the photographic plate. At this time, an interference call is made in the photographic plate. For example, the interference arc has a density of 6000 / mm. When the light is transmitted in the direction of the completed hologram spherical wave projection, only the light of the wavelength is diffracted and reflected because of the interferences composed of several layers, and the light of the other wavelengths goes straight. In this case, the concave mirror acts on the hologram with respect to the specific wavelength light.

The HUD optical system having the above characteristics will be described with reference to FIG.

Reference numeral 101 denotes a projector for displaying various kinds of information of an automobile in operation in one color or a plurality of colors. Reference numeral 102 denotes a windshield, which is a front glass installed in front of the automobile. Reference numeral 103 denotes a windshield 102 It is a combiner that reflects a specific wavelength at a certain angle.

In the conventional projector 101 constructed as described above, an image of various kinds of information of the automobile is generated and projected to the combiner 103 attached to the windshield 102. [ Then, the combiner 103 reflects only a specific wavelength of the light incident from the projector 101 at a specific angle and transmits the light to the driver's field of view. Accordingly, the driver is able to effectively obtain various kinds of information of the automobile while the driver views the virtual image displayed on the combiner 103 of the windshield 102 and displayed without directly viewing information displayed on the projector 101.

When the various information according to the driving of the vehicle is supplied through the combiner 103 of the windshield 102, the resistance value of the variable resistor connected to the projector is converted according to the surrounding brightness, The brightness of the image displayed on the combiner of the windshield can be adjusted.

That is, when the brightness of the surroundings is too bright and the image displayed on the combiner 103 of the windshield 102 is not clearly visible, the driver increases the operating power supplied to the projector 101 and increases the brightness of the projector 101 do. The brightness of the image displayed on the combiner 103 of the windshield 102 is increased and the image displayed on the combiner 103 of the windshield 102 can be efficiently provided even if the periphery of the vehicle is bright.

On the other hand, when the brightness of the surroundings is dark and the image displayed on the combiner 103 of the windshield 102 is not clearly visible, the operation power supplied to the projector 101 decreases and the brightness of the projector 101 becomes dark. The brightness of the image displayed on the combiner 103 of the windshield 102 becomes dark and the image displayed on the combiner 103 of the windshield 102 can be effectively watched even if the periphery is dark.

However, if dust accumulates on the front of the windshield, the wavelength that should be transmitted through the weed shield is not transmitted but reflected by the dust. Therefore, the driver's sight is affected by the image of the wavelength reflected by the combiner, The driver has the drawback of seeing double images because the images of reflected wavelengths are transmitted at the same time.

In particular, this not only fails to provide accurate information to the driver, but also has the disadvantage of obstructing safe driving by blocking the driver's field of vision.

The present invention relates to an image distortion preventing device and an image distortion preventing device in a HUD optical system that can prevent a two-dimensional image displayed on a projector from being displayed by removing dust by operating a wiper when a predetermined amount of dust is accumulated by detecting a dust amount accumulated in a windshield The purpose of the present invention is to provide a method.

According to an aspect of the present invention, there is provided a method of manufacturing a windshield comprising the steps of emitting an optical source (10) to a combiner of a windshield, reflecting an optical source reflected from a combiner of the windshield, A step of calculating the reflectance of the optical source based on the amount of reflection of the detected optical source, a step of comparing the detected reflectance with a reference reflectance, a step of detecting the amount of reflection again when the reflectance is smaller than the reference reflectance And when the reflectance is greater than the reference reflectance, the wiper is operated to remove the dust accumulated on the front surface of the windshield.

That is, the present invention relates to a projector which is adapted to project an image of various kinds of information of an automobile, and a HUD which is attached to a windshield and has a combiner for reflecting an image of a specific wavelength among wavelengths of images projected from the projector An optical system comprising: a mirror provided to reflect an optical source and an optical source reflected by the combiner; a light amount sensor for detecting the amount of reflection of the optical source reflected by the mirror; The reflectance of the optical source is calculated based on the reflection amount of the optical source, the reflectance is compared with the reference reflectance, the reflection amount is detected again if the reflectance is smaller than the reference reflectance, and the drive signal for activating the wiper is generated when the reflectance is larger than the reference reflectance And control means for outputting And a wiper driving unit adapted to receive a driving signal to operate the wiper so as to remove dust accumulated on the front surface of the windshield.

1 is a schematic diagram of a conventional HUD optical system,

2 is a schematic diagram of a HUD optical system according to the present invention,

FIG. 3 is a flowchart showing an operation state of the HUD optical system according to the present invention.

Description of the Related Art [0002]

10: Optical Source 12: Windshield

14: Combiner 16: Miller

18: Light intensity sensor 20: Projector

22: Miller 24: ECU

26:

The present invention relates to a projector which is provided with a projector (20) for projecting an image of various kinds of information of an automobile, an image sensor (20) attached to the windshield (10) (10), such as a halogen lamp, and an optical source (10) reflected by a combiner (14). The optical source (10) A light amount sensor 18 for detecting the amount of reflection of the optical source 10 reflected by the mirror 16 and a light amount sensor 18 for detecting the amount of reflection of the optical source 10, The reflectance of the optical source 10 is calculated, the reflectance is compared with the reference reflectance, the reflection amount is detected again if the reflectance is smaller than the reference reflectance, and E And a wiper driving unit 26 for receiving a driving signal output from the ECU 24 and operating a wiper to remove dust accumulated on the front surface of the windshield 12. [

Here, the mirror 22 is provided so that the light projected from the optical source 10 can be converged and projected onto the combiner 14 of the windshield 12.

3 is a flow chart illustrating the operating state of the HUD optical system according to the present invention, including the steps of emitting an optical source 10 to a combiner 14 of a windshield 12, A step of reflecting the optical source 10 reflected from the optical fiber 10 and a reflection amount of the optical source 10 reflected by the optical source 10; A step of calculating a reflectance and a step of comparing the detected reflectance with a reference reflectance; if the reflectance is smaller than the reference reflectance, the reflection amount is detected again; if the reflectance is greater than the reference reflectivity, Thereby removing the dust.

The function of the present invention thus constructed will be described.

A combiner 14 that is condensed by a mirror 22 installed at the upper end of the optical source 10 and is attached to the inner surface of the windshield 12 is irradiated with light emitted from the optical source 10, Only the light of a specific wavelength out of the optical source 10 is reflected (S2) due to the characteristics of the combiner 14 and is transmitted to the mirror 16.

Of course, when dust is present on the front surface of the windshield 12, the light reflected by the windshield 12, which is accumulated with dust, is incident on the mirror 16 as well as the light reflected by the combiner 14.

The light transmitted to the mirror 16 is reflected by the mirror 16 and transmitted to the light amount sensor 18 so that the amount of light S3 detected by the light amount sensor 18 The reflectance of the optical source 10 reflected by the combiner 14 and the windshield 12 is calculated (S4).

Then, the ECU 24 determines the magnitude relation between the calculated reflectance and the reference reflectance (about 10%) stored in the ECU 24 (S5), and if the calculated reflectance is smaller than the reference reflectance And if the calculated reflectance is larger than the reference reflectance, a drive signal for operating the wiper is generated and supplied to the wiper driver 26. [

Accordingly, the wiper driving unit 26 receives the driving signal output from the ECU 24 and operates the wiper (S6) to remove dust accumulated on the front surface of the windshield 12, so that the dust accumulated on the front surface of the windshield 12 And the image projected from the projector 20 is reflected only by the combiner 14 and is transmitted to the single phase to the driver.

According to another aspect of the present invention, there is provided an optical system including an optical source, a mirror installed to reflect an optical source reflected by the combiner, a light amount sensor detecting a reflection amount of an optical source reflected by the mirror, An ECU for calculating a reflectance of an optical source by a reflection amount of a source, comparing the reflectance with a reference reflectance, detecting an amount of reflection again when the reflectance is smaller than the reference reflectance, and generating a drive signal for activating the wiper when the reflectance is larger than the reference reflectance, And a wiper driving unit for removing dust accumulated on the front surface of the windshield by operating a wiper by receiving a drive signal outputted from the ECU to remove dust from the front surface of the windshield so that the image projected from the projector is formed There is an effect that can be prevented.

Further, the present invention provides an accurate information to the driver, but does not obscure the driver's view, thereby enabling the safe driving of the driver.

Although the present invention has been described with respect to an embodiment of an image distortion prevention apparatus and method in the HUD optical system as described in the claims, the present invention is not limited thereto, Its application and modification will be possible.

Claims (4)

A projector 20 mounted on the windshield 10 for reflecting an image of a specific wavelength among the wavelengths of the image projected from the projector 20; The HUD optical system of an automobile having an optical source 10 and an optical source 10 for reflecting an optical source 10 reflected by a combiner 14, A light amount detection sensor 18 for detecting the amount of reflection of the optical source 10 to be reflected; a reflectance calculating unit for calculating a reflectance of the optical source 10 based on the amount of reflection of the detected optical source 10, An ECU 24 for generating a drive signal for activating the wiper when the reflection amount is again detected when the reflectance is smaller than the reference reflectance and smaller than the reference reflectance, Wind on the distortion prevention apparatus in the HUD optical system, characterized by doeeojim composed of the wiper driving unit (26) for removing dust on the front of the shield (12). The apparatus of claim 1, wherein the optical source (10) is a halogen lamp. The apparatus of claim 1, wherein a mirror (22) is provided on an upper portion of the optical source (10). Radiating the optical source 10 to the combiner 14 of the windshield 12 and reflecting the optical source 10 reflected from the combiner 14 of the windshield 12, A step of calculating the reflectance of the optical source 10 by the amount of reflection of the detected optical source 10 and a step of calculating the reflectance of the optical source 10 by comparing the detected reflectance with the reference reflectance, , And if the reflectance is smaller than the reference reflectance, the reflection amount is detected again, and if the reflectance is larger than the reference reflectance, the wiper is operated to remove the dust accumulated on the front surface of the windshield 12 A method for preventing phase distortion.