KR20000050024A - stereo PMD(Personal Mobile Display) system using a single display device - Google Patents

Abstract

PURPOSE: A personal mobile display(PMD) apparatus with a single display device is provided to reduce the cost of a product, decrease the difference of intensity between divided images and reduce the weight of the PMD apparatus, by adopting only one display device in the PMD apparatus. CONSTITUTION: Liquid crystal shutters(9,9') are synchronized with a single display device(3) and thereby display a three-dimensional image. The liquid crystal shutters(9,9') make a time multiplex of left and right images which are processed by a stereo camera and a computer, and arrange them sequentially, and match the images displayed on the display device(3). A beam dividing device(33) is comprised of a lens(40) and a reflection mirror(11) of a vertical prism type. The lens(40) sends a displayed image to eyes. Magnifiers(6,6') enable the displayed image to be shown as a magnified one at a certain distance. Reflection mirrors(8,8) send the divided images to the left and the right eyes.

Description

Stereo personal mobile display device using a single display device {stereo Personal Mobile Display (PMD) system using a single display device}

Most virtual reality, medical, and simulation systems currently use HMD-like HMDs on a limited basis, but are becoming slow to popularize due to price obstacles. However, it can be expected that PMD devices will be used as the screens when portable computers become commercially available. HMD, similar to PMD, can be divided into monocular and binocular, and the monocular is composed of an optical system separately for each eye, and a single optical system is composed of one eye. It is a way to do only, binocular expression is to configure the system so that the displayed image corresponding to each eye is complemented in both eyes. In addition, the binocular display method can be divided into a stereo (stereo) method and a bi-ocular (bi-ocular) method. The biocula method refers to the case where the images corresponding to the left and right eyes are the same, and the stereo method makes the depths by matching the same stores corresponding to the eyes with the left and right eyes corresponding to each image corresponding to the left and right eyes slightly different. In this way, a 3D image can be viewed. CRTs and flat panel displays (mostly LCDs) have been used as display elements of HMD devices, and flat panel displays are mainly used due to the volume, weight, and size, which are disadvantages of CRTs. Currently, HMD products, which are currently limitedly marketed by US, Japanese and Korean companies, are focused on the development of display devices for high resolution, optical design with high viewing angle and low image distortion, and low weight. Two LCDs, 0.7- to 3.3-inch, are used as display elements, and a variety of products ranging from 36g to 1000g are commercially available. The display elements of the HMD device, which are currently produced in a limited manner, are made using two displays, namely two corresponding to the left and right eyes. A schematic diagram of the head mounted display device configured as described above is shown in FIG. 1. As shown in the figure, it consists of LCD (101, 101 ') and Magnifier (102, 102') to make the screen displayed on LCD at a suitable size and distance. As a PMD device, there is a personal monitor sold by Densitron, which uses one display element 91 and uses an optical system having the configuration as shown in FIG. As shown in FIG. 2, the beam splitting reflector configuration (92,95,93,93 ') designed to send one screen to both eyes is the core technology of this device, but there is a disadvantage that the intensity difference of each part of the divided screen is generated. .

Accordingly, the present invention provides a stereo personal mobile display (PMD) device, which reduces the use of two display elements in the past, reduces the intensity difference of the image divided into two by specially designed beam splitting, and reduces the weight of the PMD device. .

As described above, in order to achieve the object of the present invention, as shown in FIG. 3, the present invention includes a display element 3, a lens 4 for sending a displayed image to both eyes, and a reflector 11 having a rectangular prism shape. The left and right images processed by the beam splitting apparatus 33, the stereo camera and the computer are sequentially arranged by time multiplexing, and the liquid crystal shutter 9 for corresponding images to the respective eyes is displayed. 9 '), a magnifier (6,6') for viewing the magnified image at a certain distance, and a reflector (8,8 ') for sending the divided image to the left and right eyes. do.

In the present invention, the driving frequency of the display element 3 operates at 120 Hz and 60 Hz. You can see three-dimensional images when operating at 120 Hz, and two-dimensional images when operating at 60 Hz.

Figure 1-Typical Head Mounted Display Device

Figure 2-Optical system of PMD device sold by Densitron

3-Stereo PMD Apparatus of the Present Invention

a-an exploded view of the stereo PMD device of the present invention

b-top view from above of a stereo PMD device of the present invention

Figure 4-Beam splitting device consisting of a lens and a reflector in the form of a rectangular prism

5-Mono PMD Device of the Invention

a-development of mono PMD device of the present invention

b-top view of mono PMD device of the present invention from above

6-another embodiment of the stereo PMD apparatus of the present invention

7-Another embodiment of the mono PMD device of the present invention

1 is a schematic diagram of a general HMD device that is currently commercialized. As shown in FIG. 1, two LCDs 101 and 101 'are used as display elements, and two magnifiers 102 and 102' for enlarging an image are disposed on both eyes.

2 is an optical configuration diagram of a personal monitor sold by Densitron company. As shown in the figure, one display element 81, reflectors 92, 95, 93 and 93 'for dividing a screen into two, magnifier 88 and 88' for enlarging an image, divided image It is composed of reflectors 70, 70 'for sending to the left and right eyes.

3 is a block diagram of a personal mobile display (PMD) device according to the present invention. The PMD apparatus according to the present invention includes a display element 3, a lens 4, a reflector 11 in the form of a right-angle prism, a magnifier 6, 6 ', a liquid crystal shutter 9, 9', a reflector 8, 8 ').

The beam splitting device 33 composed of the lens 4 and the reflector 11 having a rectangular prism shape serves to divide the image displayed by the display element 2 into two, and the rectangular prism near the focal length of the lens 4. By placing a reflector 11 of the shape serves to divide the image into two. In the focal plane of the lens 4, a Fourier transformed image of the image displayed on the display element 3 is produced, and the spatial frequency distribution of the Fourier transformed image is left and right. By dividing the image in which the frequency is matched left and right in two by using the reflector 11 of the rectangular prism type, two images having the same intensity and the same are made. By using the beam splitting apparatus 33 of this type, not only the configuration of the PMD apparatus is simplified, but also the size of the Fourier transformed image is small, so that the size of the plane of the reflector 11 of the rectangular prism type can be reduced. Weight will also be reduced.

The PMD apparatus according to the present invention can display a 3D image. In order to display the 3D image, the left and right images obtained by the stereo camera and the computer are sequentially arranged in order from the left and right in order, and the driving frequency is driven at 120 Hz to minimize flickering of the transmitted image. FLCD is used as a possible display element 3. The driving frequency of the FLCD is operable at 120 Hz or 60 Hz, and when driven at 120 Hz, the 3D stereoscopic image can be viewed, and when driven at 60 Hz, only the enlarged 2D image can be viewed. When the driving frequency of the FLCD is driven at 120 Hz, the liquid crystal shutter 9 on the left eye is opened when the left image is displayed on the FLCD, and the liquid crystal shutter on the right eye ( 9 ') is synchronized to close. In addition, the image on the right is displayed on the FLCD after 1/120 seconds, and the displayed image is synchronized so that the liquid crystal shutter 9 'is opened at the right eye and the liquid crystal shutter 9 is closed at the left eye. Therefore, the upper left image corresponds to the left eye, and the upper right image corresponds to the right eye, and afterimages of the left and right images corresponding to each other remain in both eyes to view the 3D image. In addition, when the driving frequency of the FLCD is driven at 60 Hz, the liquid crystal shutters 9 and 9 'of both eyes are left open so that only the viewer can see the plane.

4 is a diagram of a beam splitting device composed of a lens 4 and a reflecting mirror 11 in the form of a rectangular prism. By collecting the near parallel light reflected by the backlight on the display element 3 with the lens 4 and by placing a reflector 11 in the form of a rectangular prism near the focal length of the lens 4, the displayed image can be divided into two. . The image light 77 collected by the lens 4 in the right angle prism-shaped reflector 11 is circular, and the corner of the right angle prism-shaped reflector 11 is cut so that the image light 77 can be cut in half. By placing it in the same position as the diameter of the role of dividing the image into two.

5 is a configuration diagram of yet another embodiment 1 of a personal mobile display (PMD) device according to the present invention. Embodiment 1 of a PMD apparatus according to the present invention comprises a display element 3, a lens 4, a reflector 11 in the form of a right prism, a magnifier 6, 6 ', and a reflector 8, 8'. It is done. As shown in FIG. 3, only the liquid crystal shutter 9.9 ′ is subtracted from FIG. 3, and the PMD device according to FIG. 5 may display only a two-dimensional image and may serve as a portable monitor.

6 is a configuration diagram of yet another embodiment 2 of a personal mobile display (PMD) device according to the present invention. Embodiment 2 of the PMD apparatus according to the present invention includes a display element 3, a lens 4, a first reflecting mirror 55, a reflecting mirror 11 having a rectangular prism shape, a magnifier 6, 6 ', and a liquid crystal shutter. (9, 9 ') and second reflecting mirrors (8, 8'). As shown in the figure, by using the first reflector 55 as a PMD device in which the first reflector 55 is added to FIG. 3, the overall length is reduced and the curved space can be used. The PMD device having such a configuration may be more comfortable to wear than the PMD device of FIG. 3 in an easy form to attach to glasses.

7 is a configuration diagram of yet another embodiment 3 of a personal mobile display (PMD) device according to the present invention. The third embodiment of the PMD apparatus according to the present invention includes the display element 3, the lens 4, the first reflector 55, the reflector 11 in the form of a right prism, the magnifiers 6 and 6 ', and the second. And reflecting mirrors 8 and 8 '. As shown in the figure, by using the first reflector 55 as a PMD device in which the first reflector 55 is added to FIG. 5, the overall length is reduced and the curved space can be used. The PMD device having such a configuration may be more comfortable to wear than the PMD device of FIG. 5 in an easy form to attach to glasses.

The present invention can reduce the production cost by reducing the use of two display elements in the past as a stereo personal mobile display (PMD) device, and can reduce the intensity difference of the image divided into two by specially designed beam splitting. The advantages and simplicity of the optical system make it possible to reduce the weight of the PMD device, making it easy to use and popularized.

Claims (10)

One display element 3; Liquid crystal shutters (9, 9 ') for displaying a three-dimensional image in synchronization with the display element (3); A beam splitting device 33 composed of a lens 4 and a reflecting mirror 11 in the form of a right prism; Magnifiers 6 and 6 '; Personal mobile display device consisting of reflectors (8,8 ') Personal movable display device having a beam splitting device 33 for positioning a reflector 11 in the form of a rectangular prism near the focal plane of the lens 4 in claim 1. In claim 1, the FLCD is used as the display element 3, and the driving frequency of the FLCD is 120 Hz and 60 Hz, which enables dual mode operation so that a 3D image can be viewed when operating at 120 Hz, and 60 Hz. Personal display device with drive circuitry allowing viewing of two-dimensional images during operation One display element 3; A beam splitting device 33 composed of a lens 4 and a reflecting mirror 11 in the form of a right prism; Magnifiers 6 and 6 '; Personal mobile display device consisting of reflectors (8,8 ') Personal mobile display device having a beam splitting device 33 for positioning a reflector 11 in the form of a rectangular prism near the focal plane of the lens 4 in claim 4. One display element 3; Liquid crystal shutters (9, 9 ') for displaying a three-dimensional image in synchronization with the display element (3); A beam splitting device composed of a lens 4 and a reflecting mirror 11 in the form of a right prism; A first reflector 55; Magnifiers 6 and 6 '; Personal mobile display device composed of second reflectors (8,8 ') Personal movable display device having a beam splitting device for positioning the reflector 11 in the form of a right-angle prism near the focal plane of the lens 4 in claim 6 In claim 6, the FLCD is used as the display element 3, and the driving frequency of the FLCD is 120 Hz and 60 Hz dual mode operation, and when operating at 120 Hz to view a three-dimensional image, 60 Hz Personal display device with drive circuitry allowing viewing of two-dimensional images during operation One display element 3; A beam splitting device composed of a lens 4 and a reflecting mirror 11 in the form of a right prism; First reflector 55; magnifiers 6, 6 '; Personal mobile display device composed of second reflectors 8, 8 ′ Personal movable display device having a beam splitting device for positioning the reflector 11 in the form of a rectangular prism near the focal plane of the lens 4 in claim 9.