KR100287710B1 - Head mounted display(hmd) - Google Patents

Abstract

PURPOSE: A head mounted display(HMD) is provided, which maintains a constant distance and location between optical devices by preventing a reflector from being shaken by installing an elastic member between a frame and the reflector. CONSTITUTION: A liquid crystal display(LCD) panel displays an image. A backlight is arranged on a rear part of the LCD panel and emits a white light to the LCD panel. A half mirror and a reflector(150) transmits or reflects a light transmitted through the LCD panel to change a path of the light. And an eye lens makes an image by making a light including image information incident to an eye of a user. A frame(110) supports the whole system, and a panel fixing part fixes the LCD panel and the backlight to the frame. A mirror fixing part is assembled to the fixing mirror and supports the half mirror and the reflector. And an elastic member(170) is installed between a bottom of the frame and an upper side of the reflector, and provides an elastic force so that the reflector maintains an adhered state to the mirror fixing part.

Description

Head mounted display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head mounted display (HMD) for use as a personal display device, and more particularly, to a head mounted display device in which a distance and position structure between optical systems affecting optical performance is changed.

Recently, the demand for personal display devices is increasing according to the trend of miniaturization of display elements, and the image output from the small image display element is enlarged by using an optical system, and the virtual image is visually observed, thereby allowing a large screen at a constant distance. A display device that has the same effect as viewing an image with the above has been developed. Such devices are called head mounted display devices (HMDs) because most of them are worn in the same way as glasses.

FIG. 1 is a front view of the general head mounted display device, and FIG. 2 is a sectional view taken along the line A-A of FIG.

1 and 2, reference numeral 110 denotes a frame supporting the entire system, 120 denotes a liquid crystal (LCD) panel displaying an image, and 130 denotes the liquid crystal panel 120 and the liquid crystal panel 120. The panel fixing part which is disposed at the rear side and simultaneously supports a backlight (not shown) for emitting white light to the liquid crystal panel 120 is fixed to the frame 110.

In addition, the reference numeral 140 is disposed to form an angle of 45 degrees with the incident light is passed through the liquid crystal panel 120 in the light containing the image information, half of the magnification is reflected and half the half (mirror) to transmit the other half ( Half mirror), 150 denotes a reflector reflecting the light reflected from the half mirror 140 again in the direction of the half mirror 140, 160 denotes the half mirror 140 and the reflector 150 at the same time It shows a mirror fixing to support and secure to the frame (110).

Looking at the traveling path of the light in the head mounted display device having the above configuration, the white light emitted from the back light (not shown) includes the image information while passing through the liquid crystal panel 120, and reflected from the half mirror 140 The reflected light travels in the direction of the reflector 150 and is again reflected by the reflector 150 in the direction of the half mirror 140, so that the light passing through the half mirror 140 is incident on the user's eye and formed. .

In the head-mounted display device as described above, the distance between the optical systems (L1 and L2 in FIG. 2) and the posture after assembling must be accurately maintained in order to satisfy the performance required by the design. If the distance is changed or shakes during the operation, the size of the image that is incident to the left and right eyes of the user may be different from each other, and a distortion of the signal may occur to deteriorate the image quality.

Figure 3 is a cross-sectional view of the prior art that improved the mounting structure of the reflector to solve the above problems.

First, referring to FIG. 4A, a gap 111 is formed between the frame 110 and the reflector 15 by forming the protrusion 111 at a position opposed to the reflector 150 in the frame 110. By minimizing the structure to prevent the shake of the reflector 15 during operation of the system. However, even when the protrusion 111 is formed to minimize the gap with the reflector 15, the gap may be increased due to thermal deformation of the frame 110, the reflector 150, or the like during use. Since the protrusion structure must strictly control the distance tolerance to the protrusion formed on the frame 110 during manufacturing, it becomes difficult to manufacture the frame, which raises the manufacturing cost, and causes the shaking of the reflector during operation of the head mounted display device. There is a problem that can not provide a stable picture quality because it can not be eliminated completely.

On the other hand, referring to Figure 3 (B), it is a structure to prevent the shaking of the reflector 150 during operation by injecting and fixing the adhesive between the frame 110 and the reflector 150. However, such an adhesive structure has a problem of increasing the assembly cost because the adhesive process is added to the assembly process of the system, it is difficult to disassemble the parts for product repair when a failure occurs due to the defective product.

The present invention has been made to solve the above problems, the object is to install a resilient member between the frame and the reflector to prevent the shake of the reflector head mounted to maintain a constant distance and position between the optical system It is to provide a display device.

1 is a view showing the configuration of a general head-mounted display device,

2 is a cross-sectional view taken along line A-A of FIG.

FIG. 3 is a detailed view of portion B of FIG. 2 showing a mounting structure of a reflector according to the prior art;

FIG. 4 is a detailed view of portion B of FIG. 2 showing a mounting structure of a reflector according to the present invention; FIG.

<Description of Symbols for Main Parts of Drawings>

110 frame 120 liquid crystal panel

130: Panel fixing 140: Half mirror

150: reflector 160: mirror fixing

170: elastic member

According to a feature of the present invention for achieving the above object, at the same time to support the frame (Frame) for supporting the entire system, the liquid crystal (LCD) panel and the back light (Backlight) for displaying an image to be fixed to the frame A panel fixing unit, a mirror fixing unit for supporting and fixing a half mirror and a reflector assembled in the frame and changing a path of light passing through the liquid crystal panel, and an upper side of the bottom of the frame and the reflecting mirror It is provided between the stages to provide a head-mounted display device (HMD) comprising an elastic member for providing an elastic force to maintain the state in which the reflector is in close contact with the mirror fixing portion.

At this time, the elastic member may be made of a leaf spring.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

4 is a view showing a mounting structure of the reflector according to the present invention.

The head mounted display device to which the present invention is applied is arranged in the rear of the liquid crystal panel 120 and the liquid crystal panel 120 for displaying an image as shown in FIG. Backlight (not shown), the half mirror 140 which transmits and reflects to change the path of the light passing through the liquid crystal panel 120, the reflector 150, and the light including the image information are incident on the user's eyes to form an image. Eyepieces (not shown).

2 and 4, the panel fixing part 13 supporting the entire system and the liquid crystal panel 120 and the back lighting simultaneously and fixing the frame 110 to the frame 110; A mirror fixing part 16 assembled to the frame 110 and supporting and fixing the half mirror 140 and the reflector 150, and installed between the bottom of the frame 110 and the upper end of the reflector 150. And the elastic member 170 providing the elastic force to maintain the state in which the reflector 150 is in close contact with the mirror fixing part 160.

The elastic member 170 may be made of a leaf spring. The elastic member 170 may be attached to the bottom of the frame 110 using an adhesive or may be fitted between the frame 110 and the upper end of the reflector 15.

In such a configuration, the elastic member 170 is to push the reflector 150 to the mirror fixing portion 160 to maintain the correct posture necessary for operation in place.

As described above, the head mounted display device of the present invention maintains a state in which the reflector is in close contact with the mirror fixing part by the elastic member, thereby preventing shaking during operation of the system, thereby satisfying the specification required for design. There is an effect that can provide a clear image.

In addition, since the reflector is not fixed using an adhesive, assembly assembly can be simplified and productivity can be improved, and disassembly can be easily performed even when product defects occur.

Claims (2)

A frame supporting the entire system, a panel fixing unit which simultaneously supports and fixes the LCD panel and the backlight which display an image, and is fixed to the frame, and is assembled to the frame and passes through the liquid crystal panel. A mirror fixing portion for supporting and fixing a half mirror and a reflector for changing a path of light, and a bottom portion of the frame and an upper end of the reflecting mirror so that the reflecting mirror is provided at the lower portion of the mirror fixing portion. Head mounted display device (HMD) characterized in that it comprises an elastic member for providing an elastic force to maintain a close contact with the. The method of claim 1, Head mounted display device (HMD), characterized in that the elastic member is made of a leaf spring.