Near-to-eye display device for reducing image interference based on thickness

Abstract

The invention provides a near-to-eye display device capable of reducing image interference based on thickness, which comprises a display, an imaging lens, a plain film light splitting assembly and a concave film light splitting assembly, and is characterized in that the display is used for outputting a display picture, and the imaging lens is used for refracting projection light of the display picture and converging the projection light to the plain film light splitting assembly; the flat sheet light splitting assembly is used for reflecting part of converged light rays of a display picture to the concave sheet light splitting assembly, the concave sheet light splitting assembly is used for reflecting the reflected light rays to the flat sheet light splitting assembly again and then enabling the reflected light rays to enter human eyes, and the concave sheet light splitting assembly is sequentially provided with a first 1 / 4 phase delay film layer, an adhesive layer, an optical film and a concave surface substrate. The thickness of the first 1 / 4 phase delay film layer is T1, the thickness of the adhesive layer is T2, and T1 + T2 is smaller than 10 microns. By setting the thicknesses of the first 1 / 4 phase delay film layer and the adhesive layer in the concave light splitting assembly, the interference of an interference image on an expected image is reduced, so that the expected image is presented more clearly, and the viewing effect is greatly improved.

Description

Technical Field

[0001] The present invention relates to near-eye display, and in particular to a near-eye display device that reduces image interference based on thickness. Background Art

[0002] A near-eye display device is an optical device used in head-mounted displays that can magnify virtual digital images and project them in front of the human eye without obstructing the human eye from viewing the real environment.

[0003] In the prior art, near-eye display devices are projected based on the BirdBath optical solution of polarization conversion. The projection light path of the virtual digital image passes through a reflective polarizing film layer, a 1 / 4 phase delay film, a concave reflective optical surface, and a tilted optical plate.

[0004] Since the 1 / 4 phase delay film has a certain thickness, the virtual digital image will enter the human eye due to multiple reflections on the thickness surfaces on both sides when passing through the 1 / 4 phase delay film, which will cause double images when the human eye views the virtual digital image, seriously affecting the viewing effect. It can be seen that the existing technology has shortcomings and needs to be improved and perfected. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a near-eye display device that reduces image interference based on thickness, aiming to solve the problem that the projection light path of the near-eye display device has ghosting, which seriously affects the viewing effect.

[0006] The present invention provides a near-eye display device for reducing image interference based on thickness, comprising a display, an imaging lens, a flat sheet beam splitter component and a concave sheet beam splitter component, wherein the display is used to output a display image, the imaging lens is used to refract the projected light of the display image and converge it on the flat sheet beam splitter component, the flat sheet beam splitter component is used to reflect part of the converged light of the display image to the concave sheet beam splitter component, the concave sheet beam splitter component is used to reflect the reflected light again to the flat sheet beam splitter component before entering the human eye, and the concave sheet beam splitter component is sequentially provided with a first 1 / 4 phase delay film layer, an adhesive layer, an optical film and a concave substrate, the thickness of the first 1 / 4 phase delay film layer is T1, the thickness of the adhesive layer is T2, and T1+T2<10um.

[0007] A near-eye display device for reducing image interference based on thickness as described above, wherein the display is MicroOled and the imaging lens is composed of one or more lenses.

[0008] In the above-mentioned near-eye display device for reducing image interference based on thickness, the flat sheet light splitting component includes a flat sheet substrate and a reflective polarizing film layer, and the flat sheet substrate is glued to the reflective polarizing film layer.

[0009] As described above, a near-eye display device for reducing image interference based on thickness is provided, wherein a second 1 / 4 phase delay film layer is provided between the display and the imaging lens.

[0010] In the above-mentioned near-eye display device for reducing image interference based on thickness, a lower light screening component is arranged between the display and the flat sheet light splitting component.

[0011] A near-eye display device for reducing image interference based on thickness as described above, wherein the lower light screening component is arranged between the display and the imaging lens.

[0012] In the above-mentioned near-eye display device for reducing image interference based on thickness, the lower light screening component is arranged between the imaging lens and the flat sheet light splitting component.

[0013] As described above, a near-eye display device that reduces image interference based on thickness, wherein a front light screening component is provided at the concave surface of the concave sheet light splitting component, and the front light screening component includes a third 1 / 4 phase delay film layer and an absorption-type polarization film layer.

[0014] Compared with the prior art, the present invention provides a near-eye display device for reducing image interference based on thickness, including a display, an imaging lens, a flat sheet spectrometer component and a concave sheet spectrometer component, wherein the display is used to output a display image, the imaging lens is used to refract the projected light of the display image and converge it on the flat sheet spectrometer component, the flat sheet spectrometer component is used to reflect part of the converged light of the display image to the concave sheet spectrometer component, the concave sheet spectrometer component is used to reflect the reflected light again to the flat sheet spectrometer component before entering the human eye, and the concave sheet spectrometer component is sequentially provided with a first 1 / 4 phase delay film layer, an adhesive layer, an optical film and a concave substrate, the first 1 / 4 phase delay film layer has a thickness of T1, the adhesive layer has a thickness of T2, and T1+T2<10um. The present invention reduces the interference of the interference image on the expected image by setting the thickness of the first 1 / 4 phase delay film layer and the adhesive layer in the concave spectrometer component, so that the expected image is presented more clearly, which greatly improves the viewing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of a near-eye display device for reducing image interference based on thickness of the present invention;

[0016] Figure 2 This is the separation diagram of the interference image and the expected image when T1+T2=100um;

[0017] Figure 3 This is the separation diagram of the interference image and the expected image when T1+T2=50um;

[0018] Figure 4This is the separation diagram of the interference image and the expected image when T1+T2=40um;

[0019] Figure 5 This is the separation diagram of the interference image and the expected image when T1+T2=30um;

[0020] Figure 6 This is the separation diagram of the interference image and the expected image when T1+T2=20um;

[0021] Figure 7 This is the separation diagram of the interference image and the expected image when T1+T2=10um;

[0022] Figure 8 This is the separation diagram of the interference image and the expected image when T1+T2=5um.

[0023] Numbers in the figure: 1, display; 2, imaging lens; 3, flat plate spectrometer assembly; 4, concave plate spectrometer assembly; 301, flat plate substrate; 302, reflective polarizing film layer; 401, concave substrate; 402, first 1 / 4 phase delay film layer; 403, adhesive layer. DETAILED DESCRIPTION

[0024] The present invention provides a near-eye display device for reducing image interference based on thickness. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Before introducing the present invention, it should be noted that the near-eye display device is an optical device for head-mounted display, which presents the picture to the human eye by changing the light of the display picture. The near-eye display device usually adopts a fixed optical path setting, specifically, the display 1 is set at the upper end, the display 1 displays downward, and an imaging lens 2 is set below the display 1. An opposing flat sheet spectrometer component 3 and a concave sheet spectrometer component 4 are set below the imaging lens 2. The flat sheet spectrometer component 3 is tilted, and the concave sheet spectrometer component 4 is vertically set. When the display 1 emits light, the light first passes through the imaging lens 2 and is refracted and converged on the flat sheet spectrometer component 3. The flat sheet spectrometer component 3 reflects part of the light to the concave sheet spectrometer component 4. The concave sheet spectrometer component 4 reflects part of the reflected light again to the flat sheet spectrometer component 3. The re-reflected light enters the human eye through the flat sheet spectrometer component 3. The flat sheet spectrometer component 3 and the concave sheet spectrometer component 4 are both transparent and reflective to light.

[0026] See also Figure 1 , Figure 1 is a structural diagram of a near-eye display device for reducing image interference based on thickness of the present invention; Figure 1As shown, a near-eye display device based on thickness reduction of image interference of the present invention comprises a display 1, an imaging lens 2, a flat sheet beam splitter component 3 and a concave sheet beam splitter component 4, wherein the display 1 is used to output a display image, the imaging lens 2 is used to refract the projected light of the display image and converge it on the flat sheet beam splitter component 3, the flat sheet beam splitter component 3 is used to reflect part of the converged light of the display image to the concave sheet beam splitter component 4, the concave sheet beam splitter component 4 is used to reflect the reflected light again to the flat sheet beam splitter component 3 before entering the human eye, the concave sheet beam splitter component 4 is sequentially provided with a first 1 / 4 phase delay film layer 402, an adhesive layer 403, an optical film and a concave substrate 401, the thickness of the first 1 / 4 phase delay film layer is T1, the thickness of the adhesive layer is T2, and T1+T2<10um. Specifically, the display is MicroOled; the imaging lens 2 is a convex lens, which is composed of one or more lenses; the flat sheet light splitting component 3 includes a flat sheet substrate 301 and a reflective polarizing film layer 302, and the flat sheet substrate 301 and the reflective polarizing film layer 302 are bonded together by gluing; the concave sheet light splitting component 4 is sequentially provided with a first 1 / 4 phase delay film layer 402, an adhesive layer 403, an optical film and a concave substrate 401, and the first 1 / 4 phase delay film layer 402 adopts a λ / 4 phase delay film; the optical film is arranged on the concave side of the concave substrate 401 in a coating manner, and the transmittance and reflectance ratio of light is 1:1; the flat sheet substrate 301 and the concave substrate 401 are both made of transparent materials, which can be plastic or glass. It should be emphasized here that the image received by the human eye is reflected by the concave sheet spectrometer component 4 to the flat sheet spectrometer component 3 and then enters the human eye. The concave sheet spectrometer component 4 is provided with a first 1 / 4 phase delay film layer 402, an adhesive layer 403, an optical film and a concave substrate 401. When reflecting the display image light, it will be reflected by the first 1 / 4 phase delay film, the adhesive layer 403 and the concave substrate 401 to form a plurality of different reflection images. The image formed by the reflection of the concave substrate 401 is the expected image, which is the image viewed by the human eye. The image formed by the reflection of the first 1 / 4 phase delay film is the first interference image, and the image formed by the reflection of the adhesive layer is the second interference image. The reflection of the adhesive layer is performed at the contact surface between the first 1 / 4 phase delay film and the adhesive layer 403. The first and second interference images will greatly affect the viewing effect of the expected image. After long-term research, it is found that as the thickness of the first 1 / 4 phase delay film layer and the adhesive layer decreases, the influence of the first and second interference images on the expected image becomes smaller and smaller. The preferred configuration of the present invention is that the thickness of the first 1 / 4 phase delay film layer is T1, the thickness of the adhesive layer is T2, and T1+T2<10um. When T1+T2<10um, the separation of the first and second interference images on the expected image will be very small, and there will be almost no interference on the expected image. For details, see the following description. Figure 2-Figure 8 It should also be noted that Figure 1 The light rays shown are only for illustration purposes and are only for indicating the direction of the light rays, and do not indicate the direction change of the light rays caused by refraction of the imaging lens 2; Figure 1 The capital letter "A" shown represents the viewing image, including the first, second interference images and the expected image. The three lines indicate that the three images enter the human eye. The solid line is the light of the expected image entering the human eye, the dotted line is the light of the second interference image entering the human eye, and the dot-dash line is the light of the first interference image entering the human eye.

[0027] See also Figure 2-Figure 8 , Figure 2 This is the separation diagram of the interference image and the expected image when T1+T2=100um; Figure 3 This is the separation diagram of the interference image and the expected image when T1+T2=50um; Figure 4 This is the separation diagram of the interference image and the expected image when T1+T2=40um; Figure 5 This is the separation diagram of the interference image and the expected image when T1+T2=30um; Figure 6 This is the separation diagram of the interference image and the expected image when T1+T2=20um; Figure 7 This is the separation diagram of the interference image and the expected image when T1+T2=10um; Figure 8 This is the separation diagram of the interference image and the expected image when T1+T2=5um. Figure 2-Figure 8 This is a simulated analysis diagram of the first, second interference images and expected images by the optical software Zemax. The outer image is formed by the first and second interference images, and the inner image is formed by the expected image. As can be seen from the figure, as the sum of T1+T2 becomes smaller, the separation of the interference image from the expected image will become smaller, and the interference to the expected image will also become smaller.

[0028] Based on the above-mentioned near-eye display device for reducing image interference based on thickness, preferably, a second 1 / 4 phase delay film layer is provided between the display 1 and the imaging lens 2. Specifically, the second 1 / 4 phase delay film layer converts the circularly polarized light of the display 1 into linearly polarized light, and the linearly polarized light is reflected after passing through the reflective polarizing film layer 302 on the flat sheet beam splitter component 3, which can effectively improve the light utilization rate of the expected image.

[0029] Based on the above-mentioned near-eye display device for reducing image interference based on thickness, preferably, a lower light screening component is provided between the display 1 and the flat sheet spectroscopic component 3. Specifically, there are two setting schemes for the lower light screening component, one is that the lower light screening component is provided between the display 1 and the imaging lens 2, and the other is that the lower light screening component is provided between the imaging lens 2 and the flat sheet spectroscopic component 3. The lower light screening component is an absorption type linear polarization element or other film material with absorption polarization function. The lower light screening component is provided so that it is not easy for other people to directly see the display content of the display 1 from the bottom of the flat sheet spectroscopic component 3, thereby improving the content security of the near-eye display device.

[0030] Based on the above-mentioned near-eye display device for reducing image interference based on thickness, preferably, a front light screening component is provided at the convex surface of the concave sheet light splitting component 4, and the front light screening component includes a third 1 / 4 phase delay film layer and an absorption-type polarization film layer. Specifically, the third 1 / 4 phase delay film layer and the absorption-type polarization film layer of the front light screening component, and the third 1 / 4 phase delay film layer is also a λ / 4 phase delay film. The provision of the front light screening component can reduce light leakage from the concave sheet light splitting component 4, making it difficult for people around to obtain the displayed content, thereby improving the content security of the near-eye display device.

[0031] In summary, the present invention provides a near-eye display device that reduces image interference based on thickness, including a display, an imaging lens, a flat sheet spectrometer component and a concave sheet spectrometer component, wherein the display is used to output a display image, the imaging lens is used to refract the projected light of the display image and converge it on the flat sheet spectrometer component, the flat sheet spectrometer component is used to reflect part of the converged light of the display image to the concave sheet spectrometer component, the concave sheet spectrometer component is used to reflect the reflected light again to the flat sheet spectrometer component before entering the human eye, and the concave sheet spectrometer component is sequentially provided with a first 1 / 4 phase delay film layer, an adhesive layer, an optical film and a concave substrate, the first 1 / 4 phase delay film layer has a thickness of T1, the adhesive layer has a thickness of T2, and T1+T2 is less than 10um. The present invention reduces the interference of the interfering image on the expected image by setting the thickness of the first 1 / 4 phase delay film layer and the adhesive layer in the concave spectrometer component, so that the expected image is presented more clearly, which greatly improves the viewing effect.

[0032] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A near-eye display device for reducing image interference based on thickness, comprising a display, an imaging lens, a flat sheet light splitting component and a concave sheet light splitting component, wherein: The display is used to output a display image, the imaging lens is used to refract the light projected from the display image and converge it on the flat-plate spectrometer component, the flat-plate spectrometer component is used to reflect part of the converged light from the display image to the concave-plate spectrometer component, and the concave-plate spectrometer component is used to reflect the reflected light again to the flat-plate spectrometer component before it enters the human eye, and is characterized in that the concave-plate spectrometer component is sequentially provided with a first 1 / 4 phase delay film layer, an adhesive layer, an optical film and a concave substrate, the thickness of the first 1 / 4 phase delay film layer is T1, the thickness of the adhesive layer is T2, and T1+T2<10um.

2. A near-eye display device for reducing image interference based on thickness according to claim 1, characterized in that: The display is MicroOled, and the imaging lens is composed of one or more lenses.

3. The near-eye display device for reducing image interference based on thickness according to claim 1, characterized in that: The flat sheet light splitting component comprises a flat sheet substrate and a reflective polarizing film layer, and the flat sheet substrate is glued and bonded to the reflective polarizing film layer.

4. The near-eye display device for reducing image interference based on thickness according to claim 1, characterized in that: A second 1 / 4 phase delay film layer is arranged between the display and the imaging lens.

5. The near-eye display device for reducing image interference based on thickness according to claim 1, characterized in that: A lower light screening component is arranged between the display and the flat sheet light splitting component.

6. The near-eye display device for reducing image interference based on thickness according to claim 5, characterized in that: The lower light filtering assembly is disposed between the display and the imaging lens.

7. The near-eye display device for reducing image interference based on thickness according to claim 5, characterized in that: The lower light screening component is arranged between the imaging lens and the flat plate light splitting component.

8. The near-eye display device for reducing image interference based on thickness according to claim 1, characterized in that: A front light screening component is arranged at the concave surface of the concave sheet light splitting component, and the front light screening component comprises a third 1 / 4 phase delay film layer and an absorption type polarization film layer.

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