CN204166196U - Single-screen binocular near-eye display optical system - Google Patents

Abstract

The utility model discloses a near-to-eye display optical system of single-screen both eyes, include: the display device comprises a display panel with a backlight source, a semi-reflecting and semi-transmitting optical lens, an amplification imaging lens group and a refraction/reflection optical component, wherein the display panel is used for providing images, the semi-reflecting and semi-transmitting optical lens is used for forming two paths of images with the same picture after the images are reflected and transmitted, the optical lens is used for shortening the light amplification imaging distance of the images, the amplification imaging lens group is used for amplifying, imaging and displaying the images, and the refraction/reflection optical component is used for adjusting the light path. The utility model discloses simple structure, the cost is lower relatively, is favorable to wearing formula electronic equipment's popularization.

Description

Single-screen binocular near-eye display optical system

technical field

The utility model relates to an optical system, in particular to a novel single-screen binocular near-eye display optical system.

Background technique

Wearable device HMD is the future development direction of digital products. Its basic principle is to magnify the image on the micro-display through the optical system, so that the viewer's eyes present a large-screen image. The portable near-eye display system is currently the best-developed wearable display product, and there are many mature commercial products, such as Google glass, Sony and other manufacturers.

Among the above-mentioned products, Google glass adopts single-screen single-eye display, which has a delicate structure, limited image magnification size, and high price, and is suitable for high-end display fields. Sony's products mainly use dual-screen and binocular display. Using this display system makes the product must be suitable for 2 identical high-definition display screens, resulting in high cost; secondly, the two display screens must display images that are completely consistent and coincident, and the electronic system must be redesigned. The processing image changes from one to two, and the two images are synchronized. For this reason, the electronic system is independent as a component, which loses the portability of the product; finally, it does not include components that provide film sources for the product alone, such as smart phones, ipads, Video products such as computers and DVDs. The former of the above two types of products has a high price for a single-eye display, while the latter has a large size, a high price and loses the portability required by wearable products.

Contents of the invention

The purpose of this utility model is to solve the problems in the above-mentioned prior art, and propose a single-screen binocular near-eye display optical system, which combines the advantages of google class and sony products, avoids their shortcomings, and provides consumers with A comfortable, portable and inexpensive optical system product.

The single-screen binocular near-eye display optical system proposed by the utility model includes: a display panel with a backlight for providing images, and a semi-reflective and semi-transparent optical system that forms two images of the same image after reflection and transmission. Lens, an optical lens that shortens the magnified imaging distance of the light of the image, a magnified imaging lens group that magnifies the image and displays it, and a refraction/reflection optical component that adjusts the optical path direction of the image to the angle at which it enters the human eye.

In this technical solution, the semi-reflective and semi-transparent optical lens can be selected from the semi-reflective and semi-transparent optical prism PBS or the semi-reflective and semi-transparent optical film produced by 3M Company. The magnifying imaging lens group can have various structures. In the technical solution, the magnifying imaging lens group includes two optical lenses, one positive and one negative. The refraction/reflection optical components are three plane reflective mirrors.

In one embodiment, the image light emitted by the display panel passes through the transflective prism and the image is divided into two parts: the reflected S light whose optical axis turns 90° clockwise and the transmitted P light whose optical axis remains unchanged.

Reflecting S optical path part: the optical lens that reduces the imaging distance enters the plane reflective lens that is parallel to the splitting surface of the beam splitting prism and forms a clockwise 45° angle with the optical axis of the reflecting part. The lens forms an image, and finally enters the pupil to form a magnified virtual image;

Transmitting P light part: the optical lens that reduces the imaging distance enters the plane reflective lens that is 90° to the surface of the dichroic prism and 45° clockwise to the optical axis of the projected part, and the optical axis of this part of the optical path is 90° counterclockwise Refraction, and then enter the magnifying optical lens to form an image. At this time, the image is reflected and mirrored once, so the image light enters the reflective lens parallel to the plane reflective lens that changes the optical path before the projection optical path, performs secondary reflection, and turns the image light clockwise. 90°, at this time the image can enter the eye pupil with a magnified positive image.

The utility model uses a semi-reflective and semi-transparent beam splitting prism to completely and real-time divide the image light into two identical images, and then make the two image light beams image separately through the plane reflective lens, which solves the problem that the near-eye display product needs two display screens This problem saves a high-definition display screen, simplifies the electronic display system, improves the portability of products using this system, and greatly saves costs. On the other hand, it also allows both eyes to see the same image at the same time, improving the viewing effect.

Description of drawings

Below, the utility model is described in detail with reference to the accompanying drawings and preferred embodiments, wherein:

Fig. 1 is a schematic diagram of the utility model.

In the figure: 1. Display panel with backlight, 2. Semi-reflective and semi-transparent dichroic prism PBS, 3. Optical lens, 4. Reflective lens, 5. Magnifying imaging lens group, 6. Human eye.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail. It should be understood that the description of the specific embodiments is only used to explain the technical solution proposed by the utility model, not to limit the utility model.

Figure 1 is a schematic diagram of the single-screen binocular near-eye display optical system of the present invention. Its main components include a display panel that can provide high-definition images (images), and a semi-reflective image that forms two identical images after reflection and transmission. Semi-transparent optical lens, two optical lenses used to shorten the magnified imaging distance of the two-way images, two magnified imaging lens groups used to magnify the two-way images, and multiple adjustments to the direction of the optical path of the image Catadioptric/reflective optics at the angle of incidence to the human eye. Wherein, the transflective optical lens can be a transflective optical prism PBS or a transflective optical film of 3M Company. In this embodiment, a transflective optical prism PBS is used. Refractive/reflective optical components use flat reflective lenses

When the display panel 1 with the backlight is turned on, the display panel 1 emits light with an image, which vertically enters the semi-reflective beam-splitting prism PBS 2, and the light of the image first encounters the semi-reflective beam-splitting prism PBS 2 To the semi-reflective and semi-transparent film surface with an angle of 45° counterclockwise to the optical axis of the image light, the image light is divided into two parts after passing through the film surface, and the optical axis of a part turns 90° clockwise and is in a clockwise direction with the film surface The reflected part of the S light at an angle of 45° clockwise, and the other part of the projected part of P light whose optical axis direction remains unchanged and forms a counterclockwise 45° angle with the film surface. The complete division of the image into two parts by optical methods is an important prerequisite for the system to become a single-screen binocular near-eye display optical system, and it is also an effective use of image light.

After the S light exits the semi-reflective and semi-transparent beam splitter PBS 2, it first enters the optical lens 3. The main function of the optical lens 3 is to shorten the magnified imaging distance of the group of image rays, and then enter the optical axis of the image rays at 45° clockwise. The flat reflective mirror 4 of the included angle, in this embodiment, the adopted flat reflective mirror is rectangular. After the image light of the S light is reflected by the plane reflective lens 4, the optical axis of the light turns 90° counterclockwise, and forms an included angle of 45° counterclockwise with the plane reflective lens 4, and the image light of the S light after turning enters and enlarges Enlarged imaging in the imaging lens 5, the magnified imaging lens group 5 can be made up of one, two, three or more individual optical lenses or cemented optical lenses, in this embodiment, it is composed of a positive and a negative two optical lenses, the image After being magnified by the magnifying imaging lens group 5, it enters the human eye 6 to form a virtual image enlarged by the erect image.

After the P light exits the dichroic prism, it first enters the optical lens 3 that shortens the magnified imaging distance. After exiting, the optical axis remains unchanged, and then enters the plane reflective lens 4 that forms a clockwise 45° angle with the optical axis, and the image light is reflected on the plane. The surface of the lens 4 is reflected, and after being reflected by the surface of the plane reflective lens 4, the optical axis turns 90° counterclockwise, and the image light enters the magnifying imaging lens group 5 for magnified imaging, because this group of image light only undergoes plane light reflection once , the image is a mirror image at this time, so the enlarged image needs to enter the plane reflective lens with an angle of 45° counterclockwise with the optical axis of the image again for secondary mirror reflection. At this time, the optical axis of the image light turns 90° clockwise, and finally The forward enlarged virtual image enters the human eye 6 for enlarged imaging.

In this embodiment, in order to satisfy the human eyes 6 to see the positive and magnified virtual image, both the S light and the P light need to be turned twice by 90 degrees. The reflected S light part first makes a clockwise 90° turn, followed by a counterclockwise 90° turn and finally enters the human eye; the transmitted P light part first makes a counterclockwise 90° turn, followed by a clockwise 90° turn and finally enters the human eye. Since the dichroic prism part undertakes the first turning of the S light, only three plane reflective lenses 4 are needed in this embodiment, which saves one plane reflective lens, saves cost, and simplifies the hardware structure at the same time.

Claims (4)

1. the nearly eye display optical system of single screen eyes, it is characterized in that, comprising: for providing the display panel of the band backlight of image, described image being formed after reflection and transmission the half-reflection and half-transmission optical mirror slip of the identical image of two-way picture, shorten the optical mirror slip of the light amplification imaging distance of described image, image carried out the amplification imaging lens set of amplification imaging display, the optical path direction of image being adjusted to the folding/reflective optical component of the angle injecting human eye.

2. the nearly eye display optical system of single screen eyes as claimed in claim 1, it is characterized in that, described half-reflection and half-transmission optical mirror slip is half-reflection and half-transmission formula optical prism PBS or half-reflection and half-transmission formula blooming piece.

3. the nearly eye display optical system of single screen eyes as claimed in claim 1, it is characterized in that, described amplification imaging lens set comprises a positive negative two panels optical mirror slip.

4. the nearly eye display optical system of single screen eyes as claimed in claim 1, it is characterized in that, described folding/reflective optical component is three plane mirror sheets.