TWM615839U

TWM615839U - Ultra short distance eyepiece system

Info

Publication number: TWM615839U
Application number: TW110201966U
Authority: TW
Inventors: 洪淩桂; 施富斌; 游鴻文
Original assignee: 雙瑩科技股份有限公司; 大陸商東莞雙瑩光電科技有限公司
Priority date: 2021-02-23
Filing date: 2021-02-23
Publication date: 2021-08-21

Abstract

一種超短距目鏡系統，其包括一顯示屏、一光學模組及複數透鏡，光學模組包含在顯示屏前依序設置的反射式偏振片、第一相位延遲片、部分穿透部分反射元件、第二相位延遲片及線偏振片，複數透鏡包括第一透鏡、第二透鏡及第三透鏡，並分別設置在光學模組中至少一者的任一側。本創作利用對於光線進行多次的相位延遲和反射，實現超短距的光學架構，同時，藉由在此架構上搭配三透鏡進行焦距調節，可在大視場達到良好之像差性能與影像品質。An ultra-short-distance eyepiece system, which includes a display screen, an optical module and a plurality of lenses. The optical module includes a reflective polarizer, a first phase retarder, and a partially penetrating and partially reflective element sequentially arranged in front of the display screen , The second phase retarder and the linear polarizer, the plural lenses include a first lens, a second lens and a third lens, and are respectively arranged on either side of at least one of the optical modules. This creation uses multiple phase delays and reflections of light to achieve an ultra-short-range optical architecture. At the same time, by using this architecture with three lenses to adjust the focal length, good aberration performance and images can be achieved in a large field of view. quality.

Description

超短距目鏡系統Ultra short eyepiece system

本創作係有關光學技術領域，特別是指一種可應用於頭戴顯示器之超短距目鏡系統。 This creation is related to the field of optical technology, especially an ultra-short-range eyepiece system that can be applied to head-mounted displays.

頭戴顯示器(Head-mounted display)是用於顯示圖像及色彩的設備，通常是用眼罩或頭盔的形式，將顯示屏貼近使用者的眼睛，通過光路調整焦距以在近距離中對眼睛投射畫面，產生虛擬實境的效果，增加配戴者的臨場感。 Head-mounted display (Head-mounted display) is a device used to display images and colors, usually in the form of a goggles or a helmet, the display is placed close to the user's eyes, and the focal length is adjusted through the optical path to project the eyes at close range The screen produces the effect of virtual reality and increases the wearer’s sense of presence.

第1圖所示為虛擬實境的頭戴顯示器之目鏡系統示意圖，顯示屏10投射出影像，經過一段光程為d的光路後入射至透鏡40，此透鏡40為單一透鏡或多個透鏡之組合，用以將影像導入至使用者的人眼24中。假設光程d為40mm，則頭戴顯示器的長度為光程d加上透鏡的厚度、適眼距、外殼等，其總和對於戴在頭上的眼罩和頭盔而言略顯笨重，且對使用者的鼻樑、頭頂、頸部都會造成負擔而無法久戴。因此，目前技術人員致力於將頭戴顯示器中目鏡系統的長度縮短，以使頭戴顯示器的厚度縮小，便於使用者配戴。 Figure 1 is a schematic diagram of the eyepiece system of a virtual reality head-mounted display. The display screen 10 projects an image, which passes through a light path with an optical path d and then enters the lens 40. The lens 40 is a single lens or a group of multiple lenses. The combination is used to import the image into the user's eyes 24. Assuming that the optical path d is 40mm, the length of the head-mounted display is the optical path d plus the thickness of the lens, eye-fitting distance, shell, etc., the sum of which is slightly bulky for the goggles and helmets worn on the head, and for the user The bridge of the nose, the top of the head, and the neck will cause a burden and cannot be worn for a long time. Therefore, current technicians are committed to shortening the length of the eyepiece system in the head-mounted display, so as to reduce the thickness of the head-mounted display, which is convenient for users to wear.

此外，為了讓頭戴顯示器所提供的虛擬影像能夠重現視覺效果，目鏡系統還必須提供高規格的影像品質，以滿足消費者對於體驗虛擬實境的視覺需求。 In addition, in order for the virtual image provided by the head-mounted display to reproduce the visual effect, the eyepiece system must also provide high-standard image quality to meet the visual needs of consumers for experiencing virtual reality.

本創作之主要目的在提供一種超短距目鏡系統，其在光學架構上採用三透鏡設計，藉以達到良好的像差平衡，提高影像品質，同時也可保持目鏡系統的超短距以及大視角。此目鏡系統可應用於頭戴顯示器、遊戲機等產品上設置之廣角鏡頭或廣角目鏡，給使用者更為完美的視覺體驗。 The main purpose of this creation is to provide an ultra-short-range eyepiece system, which uses a three-lens design in the optical structure to achieve a good aberration balance and improve image quality, while maintaining the ultra-short-range eyepiece system and large viewing angle. This eyepiece system can be applied to wide-angle lenses or wide-angle eyepieces set on head-mounted displays, game consoles, etc., to give users a more perfect visual experience.

本創作之另一目的在提供一種超短距目鏡系統，其在顯示屏後、人眼之前依序設置反射式偏振片、第一相位延遲片、部分穿透部分反射元件、第二相位延遲片和線偏振片等光學元件，利用光線的多次相位延遲及反射而達到縮短目鏡系統的整體長度，可用以將頭戴顯示器微型化。 Another purpose of this creation is to provide an ultra-short-range eyepiece system in which a reflective polarizer, a first phase retarder, a partially penetrating and partially reflective element, and a second phase retarder are sequentially arranged behind the display screen and before the human eye. Optical components such as linear polarizers and linear polarizers use multiple phase delays and reflections of light to shorten the overall length of the eyepiece system, which can be used to miniaturize head-mounted displays.

為達上述目的，本創作提供一種超短距目鏡系統，包括有一顯示屏、一光學模組與複數透鏡。其中，顯示屏用以輸出影像並發出光線。光學模組包括：一反射式偏振片，對應顯示屏設置，使光線中垂直偏振光穿透、水平偏振光反射；一第一相位延遲片，對應反射式偏振片設置，接收穿透反射式偏振片之光線，並進行第一次相位延遲；一部分穿透部分反射元件，對應第一相位延遲片設置，使經第一次相位延遲之光線部分穿透於前述部分穿透部分反射元件，部分則反射回第一相位延遲片進行第二次及第三次相位延遲；一第二相位延遲片，對應部分穿透部分反射元件設置，接收部分穿透之前述部分穿透部分反射元件且經過第二、第三次相位延遲之光線，並進行第四次相位延遲；以及一線偏振片，對應第二相位延遲片設置，用以讓只經過兩次相位延遲的光線不要通過並只讓經過四次相位延遲之光線通過。複數透鏡包括一第一透鏡、一第二透鏡及一第三透鏡，分別設置於光學模組中至少一者之任一側，將顯示屏所輸出之該影像導入至少一人眼中，且第三透鏡為最靠近顯示屏之透鏡，第一透鏡為最靠近人眼之透鏡；同時，超短距目鏡系統必須滿足下列條件(1)和(2)： (1)0.4

2.6；及 (2)0.03

+

+

0.15；其中，f₁為第一透鏡之有效焦距；f₂為第二透鏡之有效焦距；f₃為第三透鏡之有效焦距；F為超短距目鏡系統之有效焦距；R₁為第一透鏡靠近人眼之一側之曲率半徑；R₂為第一透鏡靠近顯示屏之一側之曲率半徑；R₃為第二透鏡靠近人眼之一側之曲率半徑；R₄為第二透鏡靠近顯示屏之一側之曲率半徑；R₅為第三透鏡靠近人眼之一側之曲率半徑；及R₆為第三透鏡靠近顯示屏之一側之曲率半徑。 To achieve the above objective, this creation provides an ultra-short-range eyepiece system, which includes a display screen, an optical module, and multiple lenses. Among them, the display screen is used to output images and emit light. The optical module includes: a reflective polarizer, set corresponding to the display screen, so that vertical polarized light can penetrate and reflect horizontally polarized light in the light; a first phase retarder, set corresponding to the reflective polarizer, receives the penetrating reflective polarizer The first phase retardation of the light from the film is carried out; part of the light penetrates the partially reflective element, and is set corresponding to the first phase retarder, so that the light that has undergone the first phase retardation partially penetrates the aforementioned partially penetrating partially reflective element, and some Reflected back to the first phase retarder for the second and third phase retardation; a second phase retarder is set corresponding to the partially penetrating partially reflective element, and receives the partially penetrating partially penetrating partially reflective element and passes through the second phase retarder. , The light of the third phase retardation, and the fourth phase retardation; and a linear polarizer, corresponding to the second phase retardation plate setting, to prevent the light that only passes through the two phase retardation and only let it pass through the fourth phase. The delayed light passes through. The plural lenses include a first lens, a second lens, and a third lens, which are respectively arranged on any side of at least one of the optical modules to guide the image output by the display screen into at least one person's eye, and the third lens It is the lens closest to the display screen, and the first lens is the lens closest to the human eye. At the same time, the ultra-short-range eyepiece system must meet the following conditions (1) and (2): (1) 0.4

2.6; and (2) 0.03

+

0.15; where f ₁ is the effective focal length of the first lens; f ₂ is the effective focal length of the second lens; f ₃ is the effective focal length of the third lens; F is the effective focal length of the ultra-short eyepiece system; R ₁ is the first The radius of curvature of the side of the lens close to the human eye; R ₂ is the radius of curvature of the side of the first lens close to the display screen; R ₃ is the radius of curvature of the side of the second lens close to the eyes; R ₄ is the second lens close to The radius of curvature of one side of the display screen; R ₅ is the radius of curvature of the side of the third lens close to the human eye; and R ₆ is the radius of curvature of one side of the third lens close to the display screen.

根據本創作之實施例，前述透鏡包括單片透鏡或多片式透鏡。其中，單片透鏡為球面透鏡、非球面透鏡或菲涅爾透鏡；多片式透鏡是由球面透鏡、非球面透鏡和菲涅爾透鏡中的至少一種所構成。 According to the embodiment of the present creation, the aforementioned lens includes a single lens or a multi-element lens. Among them, the single lens is a spherical lens, an aspheric lens or a Fresnel lens; the multi-element lens is composed of at least one of a spherical lens, an aspheric lens and a Fresnel lens.

根據本創作之實施例，超短距目鏡系統，更滿足下列條件(3)~(6)中任一者： (3)0

0.15； (4)0

，0

； (5)0.8

1.5；及 (6)0.7

1.3；其中，f _s4為部分穿透部分反射元件反射面之焦距；f _s5為反射式偏振片反射面之焦距；TTL為超短距目鏡系統之總長；及ω為超短距目鏡系統之半場視角。 According to the embodiment of this creation, the ultra-short-range eyepiece system further satisfies any one of the following conditions (3) ~ (6): (3) 0

0.15; (4)0

, 0

; (5)0.8

1.5; and (6) 0.7

1.3; where f _{s 4} is the focal length of the reflective surface of the partially penetrating part of the reflective element; f _{s 5} is the focal length of the reflective surface of the reflective polarizer; TTL is the total length of the ultra-short-range eyepiece system; and ω is the ultra-short-range eyepiece system The half-time perspective.

根據本創作之實施例，反射式偏振片、第一相位延遲片、部分穿透部分反射元件、第二相位延遲片和線偏振片中至少一者為薄膜材料或光學鍍膜，並以塗佈、鍍膜或黏合的方式設置於前述透鏡中至少一者或至少一平板玻璃上。 According to the embodiment of the present creation, at least one of the reflective polarizer, the first phase retarder, the partially penetrating partially reflective element, the second phase retarder, and the linear polarizer is a thin film material or an optical coating, and is coated with, The method of coating or bonding is arranged on at least one of the aforementioned lenses or on at least one plate glass.

根據本創作之實施例，部分穿透部分反射元件所反射回第一相位延遲片之第一偏振光經過第一相位延遲片的第二次相位延遲後，通過第一相位延遲片到達反射式偏振片，並在反射式偏振片上完成反射，再反射回第一相位延遲片進行第三次相位延遲，形成第二偏振光，第二偏振光穿過第一相位延遲片及部分穿透部分反射元件到達第二相位延遲片。 According to the embodiment of this creation, the first polarized light that partially penetrates the partially reflective element and is reflected back to the first phase retarder passes through the second phase retardation of the first phase retarder, and then reaches the reflective polarization through the first phase retarder. The second polarized light passes through the first phase retarder and partially penetrates the partially reflective element. Reach the second phase retarder.

根據本創作之實施例，該第一、第二、第三、第四次相位延遲皆增加1/4波長的奇數倍的相位延遲，使到達人眼之光線共延遲1個波長的整數倍。 According to the embodiment of this creation, the first, second, third, and fourth phase delays are all increased by an odd multiple of 1/4 wavelength, so that the light reaching the human eye is delayed by an integer multiple of 1 wavelength. .

根據本創作之實施例，顯示屏送出並進入反射式偏振片之光線為線偏振光；進一步地，線偏振光經過第一相位延遲片後轉換成左圓偏振光或右圓偏振光。 According to the embodiment of this creation, the light emitted from the display screen and entering the reflective polarizer is linearly polarized light; further, the linearly polarized light is converted into left circularly polarized light or right circularly polarized light after passing through the first phase retarder.

根據本創作之實施例，顯示屏送出並進入反射式偏振片之光線為圓偏振光，於顯示屏與反射式偏振片之間更設有一第三相位延遲片或一圓偏振片，使圓偏振光經過第三相位延遲片或圓偏振片後轉換為線偏振光。 According to the embodiment of this creation, the light sent from the display screen and entering the reflective polarizer is circularly polarized light. A third phase retarder or a circular polarizer is further arranged between the display screen and the reflective polarizer to make the circularly polarized light After passing through the third phase retarder or circular polarizer, it is converted into linearly polarized light.

根據本創作之實施例，顯示屏送出並進入反射式偏振片之光線為非偏振光，於顯示屏與反射式偏振片之間更設有另一線偏振片，使非偏振光經過此另一線偏振片後轉換為線偏振光。 According to the embodiment of this creation, the light sent out by the display screen and enters the reflective polarizer is non-polarized light, and another linear polarizer is arranged between the display screen and the reflective polarizer, so that the non-polarized light passes through this other linear polarizer. After the film is converted into linearly polarized light.

底下藉由具體實施例詳加說明，當更容易瞭解本創作之目的、技術內容、特點及其所達成之功效。 The following detailed descriptions are given through specific examples, and it will be easier to understand the purpose, technical content, characteristics and effects of this creation.

10:顯示屏 10: Display

12:反射式偏振片 12: Reflective polarizer

14:第一相位延遲片 14: The first phase retarder

16:部分穿透部分反射元件 16: Partially penetrating partly reflective element

18:第二相位延遲片 18: The second phase retarder

20:線偏振片 20: Linear polarizer

22:透鏡 22: lens

24:人眼 24: Human Eye

26:平板玻璃 26: flat glass

30:第一透鏡 30: The first lens

32:第二透鏡 32: second lens

34:第三透鏡 34: third lens

40:透鏡 40: lens

d:光程 d: optical path

第1圖為先前技術中頭戴顯示器的顯示屏與人眼之間，光程之示意圖。 Figure 1 is a schematic diagram of the optical path between the display screen of the head mounted display and the human eye in the prior art.

第2圖為本創作超短距目鏡系統之實施例之示意圖。 Figure 2 is a schematic diagram of an embodiment of the creation of an ultra-short-range eyepiece system.

第3A圖至第3C圖為本創作超短距目鏡系統之步驟流程圖。 Figures 3A to 3C are a flowchart of the steps for creating an ultra-short-range eyepiece system.

第4A圖至第4E圖為本創作超短距目鏡系統中三透鏡之不同配置之示意圖。 Figures 4A to 4E are schematic diagrams of the different configurations of the three lenses in the creative ultra-short-distance eyepiece system.

本創作提供一種超短距目鏡系統，應用於頭戴顯示器，其利用複數光學元件將光線進行多次反射，更在這些光學元件中搭配有複數透鏡，其能有效達到像差平衡，提昇影像的品質，並在相同長度之光程下使整體目鏡系統縮短，將頭戴顯示器微型化。 This creation provides an ultra-short-distance eyepiece system applied to a head-mounted display. It uses multiple optical elements to reflect light multiple times. These optical elements are equipped with multiple lenses, which can effectively achieve aberration balance and improve image quality. Quality, and shorten the overall eyepiece system under the same length of optical path, miniaturizing the head-mounted display.

請參考第2圖，其為本創作超短距目鏡系統之實施例之示意圖。本實施例之超短距目鏡系統包括在一顯示屏10和至少人眼24之間依序包括一反射式偏振片12、一第一相位延遲片14、一部分穿透部分反射元件16、一第二相位延遲片18、一線偏振片20及三透鏡22。其中，顯示屏10輸出影像並發出光線，此光線為偏振光或非偏振光，當光線是偏振光時，偏振光可為線偏振光、圓偏振光或其他之偏振態；在此實施例中，偏振光為線偏振光。進一步而言，此實施例中之線偏振光之偏振方向與光路垂直；反射式偏振片12對應顯示屏10設置，接收顯示屏10所發出之偏振光，並將偏振光部分穿透、部分反射，特別是本創作所採用之反射式偏振片12包含與光路垂直和平行兩種偏振方向，垂直為穿透軸，水平為反射軸；第一相位延遲片14對應反射式偏振片12設置，用以接收從反射式偏振片12部分穿透之偏振光，並進行第一次相位延遲；部分穿透部分反射元件16對應該第一相位延遲片14設置，接收通過第一相位延遲片14之光線並將通過之光線部分反射、部分穿透；第二相位延遲片18對應部分穿透部分反射元件16設置，接收部分穿透部分反射元件16之光線，並進行相位延遲；線偏振片20對應第二相位延遲片18設置，線偏振片20是用以讓只經過兩次相位延遲的偏振光不要通過並只讓經過四次相位延遲之偏振光通過，藉由透鏡22將影像導入人眼24中。 Please refer to Figure 2, which is a schematic diagram of an embodiment of the creation of an ultra-short-range eyepiece system. The ultra-short-distance eyepiece system of this embodiment includes a reflective polarizer 12, a first phase retarder 14, a partly penetrating partial reflective element 16, a Two phase retarders 18, one linear polarizer 20 and three lenses 22. Wherein, the display screen 10 outputs images and emits light, which is polarized light or unpolarized light. When the light is polarized light, the polarized light can be linearly polarized light, circularly polarized light or other polarization states; in this embodiment , Polarized light is linearly polarized light. Furthermore, the polarization direction of linearly polarized light in this embodiment is perpendicular to the optical path; the reflective polarizer 12 is set corresponding to the display screen 10, receives the polarized light emitted by the display screen 10, and partially penetrates and partially reflects the polarized light , Especially the reflective polarizer 12 used in this creation contains two polarization directions perpendicular and parallel to the optical path, vertical as the transmission axis, and horizontal as the reflection axis; the first phase retarder 14 is set corresponding to the reflective polarizer 12, with To receive the polarized light partially penetrated by the reflective polarizer 12 and perform the first phase retardation; the partially penetrating partially reflective element 16 is set corresponding to the first phase retarder 14 and receives the light passing through the first phase retarder 14 Line and partially reflect and partially penetrate the light passing through; the second phase retarder 18 is provided corresponding to the partially penetrating partially reflective element 16, receives the partially penetrating partially reflective element 16 and performs phase retardation; the linear polarizer 20 corresponds to The second phase retarder 18 is provided. The linear polarizer 20 is used to prevent the polarized light that has only undergone two phase delays from passing through and only allows the polarized light that has undergone four phase retardations to pass through. The image is guided to the human eye 24 through the lens 22 middle.

特別的是，本創作中第一相位延遲片14之快慢軸與反射式偏振片12之穿透軸夾45度角，可增加1/4波長的相位延遲。 In particular, the fast and slow axis of the first phase retarder 14 and the penetration axis of the reflective polarizer 12 in this creation are at an angle of 45 degrees, which can increase the phase retardation of 1/4 wavelength.

此外，本創作中之三透鏡22，分別設置於光學模組中至少一元件之任一側，以第2圖之實施例為例，三透鏡22設在部分穿透部分反射元件16和第一相位延遲片14之間。每一透鏡皆可為單片透鏡或多片式透鏡；具體來說，透鏡可為球面透鏡、非球面透鏡和菲涅爾透鏡(Fresnel lens)中的一種單片透鏡，或者，可為由球面透鏡、非球面透鏡和菲涅爾透鏡中的至少一種組合而成的多片式透鏡。 In addition, the three lenses 22 in this creation are respectively arranged on either side of at least one element in the optical module. Taking the embodiment in Figure 2 as an example, the three lenses 22 are arranged on the partially penetrating partially reflective element 16 and the first Between the phase retarders 14. Each lens can be a single lens or a multi-element lens; specifically, the lens can be one of a spherical lens, an aspheric lens, and a Fresnel lens, or it can be a spherical lens. A multi-element lens composed of at least one of a lens, an aspheric lens, and a Fresnel lens.

本創作中具體之步驟流程請參考第3A圖至第3C圖，首先於第3A圖中，顯示屏10輸出影像，並發出偏振光到反射式偏振片12，反射式偏振片12使偏振光部分穿透至第一相位延遲片14、部分則反射回顯示屏10，而穿透反射式偏振片12的部分穿透之偏振光經過第一相位延遲片14之後，會進行第一次相位延遲，再到達部分穿透部分反射元件16；接著請參考第3B圖，經過第一次相位延遲的偏振光在部分穿透部分反射元件16處部分穿透，部分則反射回第一相位延遲片14進行第二次相位延遲，此處之部分穿透部分反射元件16的偏振光為能量損失，而經過第一次相位延遲的偏振光穿透第一相位延遲片14後到達反射式偏振片12；接著請再參考第3C圖，反射式偏振片12將經過第二次相位延遲的偏振光進行反射，反射回第一相位延遲片14，進行第三次相位延遲，再經過部分穿透部分反射元件16，其部分穿透的偏振光(經過第三次相位延遲)到達第二相位延遲片18，並進行第四次相位延遲；接著，經第四次相位延遲的偏振光穿透第二相位延遲片18，在線偏振片20進行篩選，只讓經過四次相位延遲之偏振光通過線偏振片20，並被透鏡22導入至少一人眼24中。 Please refer to Figures 3A to 3C for the specific steps in this creation. First, in Figure 3A, the display screen 10 outputs an image and emits polarized light to the reflective polarizer 12, which partially polarizes the light Part of the polarized light that penetrates to the first phase retarder 14 is reflected back to the display screen 10, and the partially penetrated polarized light that penetrates the reflective polarizer 12 passes through the first phase retarder 14, and undergoes the first phase retardation. Then it reaches the partially penetrating partially reflective element 16; then please refer to Figure 3B, the polarized light that has undergone the first phase retardation is partially penetrated at the partially penetrating partially reflective element 16, and part is reflected back to the first phase retarder 14. The second phase retardation, here part of the polarized light penetrating the partially reflective element 16 is energy loss, and the polarized light after the first phase retardation penetrates the first phase retarder 14 and then reaches the reflective polarizer 12; Please refer to Figure 3C again, the reflective polarizer 12 reflects the polarized light that has undergone the second phase retardation, reflects back to the first phase retarder 14, performs the third phase retardation, and then passes through the partially penetrating partially reflective element 16 , Its partially penetrated polarized light (after the third phase delay) reaches the second Phase retarder 18, and the fourth phase retardation; then, the polarized light that has undergone the fourth phase retardation passes through the second phase retarder 18, and the in-line polarizer 20 is screened to allow only the polarized light that has passed the fourth phase retardation It passes through the linear polarizer 20 and is guided into at least one human eye 24 by the lens 22.

由於本創作中第一相位延遲片14及第二相位延遲片18皆為1/4波長的奇數倍相位延遲，故經過四次相位延遲後共延遲一個波長的整數倍。 Since the first phase retarder 14 and the second phase retarder 18 in this creation are both odd multiples of 1/4 wavelength, the retardation is an integer multiple of one wavelength in total after four phase retardations.

線偏振光通過第一相位延遲片14後會轉變成圓偏振光，包括左圓偏振光或右圓偏振光兩種。但當部分圓偏振光被部分穿透部分反射元件16反射回第一相位延遲片14後，又會變為線偏振光，之後雖然還會再通過第一相位延遲片14並轉換成圓偏振光，然而通過第二相位延遲片18後，仍會轉換成回線偏振光。 The linearly polarized light passes through the first phase retarder 14 and is converted into circularly polarized light, including left circularly polarized light or right circularly polarized light. However, when part of the circularly polarized light is reflected back to the first phase retarder 14 by the partially penetrating and partially reflective element 16, it will become linearly polarized light, although it will pass through the first phase retarder 14 and be converted into circularly polarized light. However, after passing through the second phase retarder 18, it will still be converted into linearly polarized light.

另外，本創作在顯示屏10及反射式偏振片12之間，更可依據顯示屏10之偏振情況增加一個或多個線偏振片、圓偏振片或相位延遲片，以調整顯示屏10之偏振態，而線偏振片、圓偏振片和相位延遲片之材質可為薄膜材料或光學鍍膜，其可利用塗佈、鍍膜或黏合的形式設置於顯示屏10或反射式偏振片12上。舉例來說，若顯示屏10發出的光線不是線偏振光而是圓偏振光，則需在顯示屏10後增加一第三相位延遲片或一圓偏振片，使顯示屏10發出之圓偏振光經過第三相位延遲片或圓偏振片後轉換成線偏振光；或者，若顯示屏10發出的光線是在無特定偏振態下之非偏振光，則需在顯示屏10後增加另一線偏振片，使顯示屏10發出之非偏振光經過此線偏振片後轉換成線偏振光。 In addition, in this creation, between the display screen 10 and the reflective polarizer 12, one or more linear polarizers, circular polarizers or phase retarders can be added according to the polarization of the display screen 10 to adjust the polarization of the display screen 10. The linear polarizer, the circular polarizer and the phase retarder can be made of thin film materials or optical coatings, which can be applied to the display screen 10 or the reflective polarizer 12 in the form of coating, coating or bonding. For example, if the light emitted by the display screen 10 is not linearly polarized light but circularly polarized light, it is necessary to add a third phase retarder or a circular polarizer after the display screen 10 so that the circularly polarized light emitted by the display screen 10 passes through The third phase retarder or circular polarizer is converted into linearly polarized light; or, if the light emitted by the display screen 10 is non-polarized light without a specific polarization state, another linear polarizer needs to be added after the display screen 10. The non-polarized light emitted by the display screen 10 is converted into linearly polarized light after passing through the linear polarizer.

第4A圖至第4E圖中為三透鏡之多種不同配置方法之實施例，此三透鏡分別為第一透鏡30、第二透鏡32及第三透鏡34，其中第三透鏡34為最靠近顯示屏10之透鏡，第一透鏡30為最靠近人眼24之透鏡。此實施例並非用於限制本創作中透鏡之配置方法，只要是在反射式偏振片12、第一相位延遲片14、部分穿透部分反射元件16、第二相位延遲片18及線偏振片20中至少一者之任一側設置透鏡、共至少三組用以調焦的透鏡便包含在本案之範圍中。 Figures 4A to 4E show examples of various configurations of three lenses. The three lenses are the first lens 30, the second lens 32, and the third lens 34. The third lens 34 is the closest to the display screen. 10 of the lens, the first lens 30 is the lens closest to the human eye 24. This embodiment is not used to limit the lens configuration method in this creation, as long as it is in the reflective polarizer 12, the first phase retarder 14, the part There are at least three groups of lenses for focusing on any side of at least one of the sub-transmitting partial reflection element 16, the second phase retarder 18, and the linear polarizer 20, and it is included in the scope of the present case.

進一步說明，反射式偏振片12、第一相位延遲片14、部分穿透部分反射元件16、第二相位延遲片18及線偏振片20等光學元件之材質可為薄膜材料或為光學鍍膜等，以塗佈、鍍膜或黏合等的方式置於上述透鏡中至少一個或至少一平板玻璃上，舉例而言，反射式偏振片12及部分穿透部分反射元件16可為在透鏡上之鍍膜，或是本身具反射式偏振功能之鏡片或為薄膜形式的光學材料貼在透鏡上，因此，本創作可將反射式偏振片12及第一相位延遲片14設為一體，部分穿透部分反射元件16及第二相位延遲片18設為一體，舉例而言，如第4A圖所示，反射式偏振片12及第一相位延遲片14為同一透鏡組34(此實施例中第三透鏡組34為單片透鏡)，例如在第一相位延遲片14靠近顯示屏10側設置反射式偏振膜或是利用特殊材料達到同一鏡片具有相位延遲及反射式偏振的功能，而在第一透鏡組30的左側，則依序設有部分穿透部分反射元件16(此實施例中為部分穿透部分反射膜)、第二相位延遲片18、線偏振片20及平板玻璃26。換言之，在第4A圖之實施例中，第一透鏡30設在第二透鏡32和部分穿透部分反射元件16之間，第二透鏡32設在第一透鏡30和第三透鏡34之間，第三透鏡34則設在第二透鏡32和反射式偏振片12、第一相位延遲片14之間。此實施例之具體數據如下表一及表二：

To further illustrate, the material of optical elements such as the reflective polarizer 12, the first phase retarder 14, the partially penetrating partially reflective element 16, the second phase retarder 18, and the linear polarizer 20 can be thin film materials or optical coatings, etc. It is placed on at least one or at least one flat glass of the above-mentioned lenses by coating, coating, or bonding. For example, the reflective polarizer 12 and the partially penetrating and partially reflective element 16 can be coated on the lens, or It is a lens with reflective polarization function or an optical material in the form of a film attached to the lens. Therefore, this creation can integrate the reflective polarizer 12 and the first phase retarder 14 into one part, which partially penetrates the partially reflective element 16. And the second phase retarder 18 are integrated, for example, as shown in FIG. 4A, the reflective polarizer 12 and the first phase retarder 14 are the same lens group 34 (in this embodiment, the third lens group 34 is Single lens), for example, a reflective polarizing film is provided on the side of the first phase retarder 14 near the display screen 10 or a special material is used to achieve the same lens with the functions of phase retardation and reflective polarization, and on the left side of the first lens group 30 , A partially penetrating partially reflective element 16 (partially penetrating partially reflective film in this embodiment), a second phase retarder 18, a linear polarizer 20, and a flat glass 26 are sequentially provided. In other words, in the embodiment of Figure 4A, the first lens 30 is provided between the second lens 32 and the partially penetrating partially reflective element 16, and the second lens 32 is provided between the first lens 30 and the third lens 34, The third lens 34 is arranged between the second lens 32 and the reflective polarizer 12 and the first phase retarder 14. The specific data of this embodiment are as follows in Table 1 and Table 2:

上表二中之A、B、C、D、E、K等為非球面公式中之參數，非球面公式為

，其中C=1/R，R為曲率半徑，K為圓椎係數。此外，表中L1、L2、L3分別代表第一、第二及第三透鏡，f1、f2及f3分別為第一、第二及第三透鏡的有效焦距，f _s4為部分穿透部分反射元件反射面之焦距，f _s5為反射式偏振片反射面之焦距，f為超短距目鏡系統之有效焦距，ω為超短距目鏡系統之半視場角，TTL為超短距目鏡系統之總長，Nd為折射率(Refractive index)，Vd為阿貝數(Abbe number)或色散係數(V-number)。 A, B, C, D, E, K, etc. in the above table 2 are the parameters in the aspheric formula, and the aspheric formula is

, Where C=1/R, R is the radius of curvature, and K is the cone coefficient. In addition, L1, L2, and L3 in the table represent the first, second, and third lens respectively, f1, f2, and f3 are the effective focal lengths of the first, second, and third lens, respectively, and f _{s 4} is the partial penetration and partial reflection The focal length of the reflective surface of the element, f _{s 5} is the focal length of the reflective polarizer reflective surface, f is the effective focal length of the ultra-short-range eyepiece system, ω is the half-field angle of the ultra-short-range eyepiece system, and TTL is the ultra-short-range eyepiece system The total length, Nd is the refractive index (Refractive index), Vd is the Abbe number (Abbe number) or dispersion coefficient (V-number).

第4B圖所示為另一實施例，反射式偏振片12與第一相位延遲片14皆設在第二透鏡32的右側，部分穿透部分反射元件16、第二相位延遲片18及線偏振片20則皆設在第一透鏡30的左側。此實施例之具體數據如下表三和表四：

Figure 4B shows another embodiment. Both the reflective polarizer 12 and the first phase retarder 14 are arranged on the right side of the second lens 32, partially penetrating the partially reflective element 16, the second phase retarder 18 and the linear polarizer. The sheets 20 are all arranged on the left side of the first lens 30. The specific data of this embodiment are as follows in Table 3 and Table 4:

第4C圖、第4D圖及第4E圖為另外三種第一透鏡30、第二透鏡32及第三透鏡34之配置方式，由於第一透鏡30、第二透鏡32及第三透鏡34可為單片透鏡或多片式透鏡之組合，且可為凹透鏡、凸透鏡等，凹凸方向也可變化，因此會產生多種不同之組合。 Figures 4C, 4D, and 4E show the other three configurations of the first lens 30, the second lens 32, and the third lens 34. Since the first lens 30, the second lens 32, and the third lens 34 can be single A lens or a combination of multiple lenses, and can be a concave lens, a convex lens, etc., and the direction of the concave and convex can also be changed, so there are many different combinations.

第4C圖之實施例中，反射式偏振片12及第一相位延遲片14設在第三透鏡34的左側，第一相位延遲片14的左側為第二透鏡32，部分穿透部分反射元件16、第二相位延遲片18及線偏振片20皆設在第三透鏡的左側。此實施例之具體數據如下表五和表六：

In the embodiment of FIG. 4C, the reflective polarizer 12 and the first phase retarder 14 are arranged on the left side of the third lens 34, and the second lens 32 is on the left side of the first phase retarder 14, which partially penetrates the partially reflective element 16. , The second phase retarder 18 and the linear polarizer 20 are both arranged on the left side of the third lens. The specific data of this embodiment are as follows in Table 5 and Table 6:

第4D圖之實施例中，和第4C圖之實施例不同的是，此實施例之第二相位延遲片18及線偏振片20作成獨立元件。此實施例之具體數據如下表七和表八：

In the embodiment of Fig. 4D, the difference from the embodiment of Fig. 4C is that the second phase retarder 18 and the linear polarizer 20 of this embodiment are made as independent elements. The specific data of this embodiment are as follows in Table 7 and Table 8:

第4E圖之實施例中，反射式偏振片12、第一相位延遲片14作成獨立元件，並設於第三透鏡34之右側，部分穿透部分反射元件16、第二相位延遲片18及線偏振片20依序設於第一透鏡30之右側。此實施例之具體數據如下表九和表十：

In the embodiment of Fig. 4E, the reflective polarizer 12 and the first phase retarder 14 are made as independent elements, and they are arranged on the right side of the third lens 34, which partially penetrate the partially reflective element 16, the second phase retarder 18 and the line The polarizer 20 is sequentially arranged on the right side of the first lens 30. The specific data of this embodiment are as follows in Table 9 and Table 10:

進一步說明，本創作可將第二相位延遲片18與線偏振片20設為一體，舉例而言，如第4E圖所示，第二相位延遲片18與線偏振片20皆在同一第一透鏡30的同一側，可等效於圓偏振片之功能。 To further illustrate, the present invention can integrate the second phase retarder 18 and the linear polarizer 20. For example, as shown in Figure 4E, the second phase retarder 18 and the linear polarizer 20 are both in the same first lens. The same side of 30 can be equivalent to the function of a circular polarizer.

本創作之超短距目鏡系統可達到較大視角、系統距離縮短及良好像差校正之效果，請參考第4A圖，超短距目鏡系統必須滿足下列條件(1)和(2)： (1)0.4

2.6；及 (2)0.03

+

+

0.15；其中，f₁為第一透鏡30之有效焦距； f₂為第二透鏡32之有效焦距；f₃為第三透鏡34之有效焦距；F為超短距目鏡系統之有效焦距；R₁為第一透鏡30靠近人眼24之一側之曲率半徑；R₂為第一透鏡30靠近顯示屏10之一側之曲率半徑；R₃為第二透鏡32靠近人眼24之一側之曲率半徑；R₄為第二透鏡32靠近顯示屏10之一側之曲率半徑；R₅為第三透鏡34靠近人眼24之一側之曲率半徑；及R₆為第三透鏡34靠近顯示屏10之一側之曲率半徑。 The ultra-short-range eyepiece system of this creation can achieve the effect of larger viewing angle, shortened system distance and good aberration correction. Please refer to Figure 4A. The ultra-short-range eyepiece system must meet the following conditions (1) and (2): (1) )0.4

2.6; and (2) 0.03

+

0.15; where f ₁ is the effective focal length of the first lens 30; f ₂ is the effective focal length of the second lens 32; f ₃ is the effective focal length of the third lens 34; F is the effective focal length of the ultra-short-range eyepiece system; R ₁ Is the curvature radius of the first lens 30 near the human eye 24; R ₂ is the curvature radius of the first lens 30 near the display screen 10; R ₃ is the curvature of the second lens 32 near the human eye 24 Radius; R ₄ is the curvature radius of the second lens 32 close to the display screen 10; R ₅ is the curvature radius of the third lens 34 close to the human eye 24; and R ₆ is the third lens 34 close to the display screen 10. The radius of curvature of one side.

較佳地，本創作之超短距目鏡系統滿足下列條件(3)至(6)中任一者： (3)0

0.15；(4)0

，0

；(5)0.8

1.5；及(6)0.7

1.3；其中，f _s4為部分穿透部分反射元件16反射面之焦距；f _s5為反射式偏振片12反射面之焦距；TTL為超短距目鏡系統之總長；及ω為超短距目鏡系統之半場視角。 Preferably, the ultra-short-range eyepiece system of this creation satisfies any one of the following conditions (3) to (6): (3) 0

0.15; (4)0

, 0

;(5)0.8

1.5; and (6) 0.7

1.3; where f _{s 4} is the focal length of the reflective surface of the partially penetrating partial reflective element 16; f _{s 5} is the focal length of the reflective surface of the reflective polarizer 12; TTL is the total length of the ultra-short-range eyepiece system; and ω is the ultra-short-range Half-field viewing angle of the eyepiece system.

上述條件(1)、(3)、(4)可達到降低系統厚度及具有光學放大效果，條件(2)可達到良好的像差平衡，可獲得較佳的影像品質，而條件(5)、(6)則可達到較大視角及輕薄化之優點。 The above conditions (1), (3), (4) can reduce the thickness of the system and have an optical magnification effect, and the condition (2) can achieve a good aberration balance and obtain better image quality, and the conditions (5), (6) The advantages of larger viewing angle and thinner can be achieved.

本創作利用偏振原理將光路在光學系統內做內部折反射達到將顯示屏到人眼之間的距離縮短的效果，以第4A圖至第4E圖為例，圖中偏振光從顯示屏10發出後至人眼24前的光學元件之光學路徑經過多次的反射，假設第4A圖至第4E圖之實施例中，光線從顯示屏10到人眼24前的光學元件的每一次反射的長度加總後的光程為d，與第1圖之先前技術中顯示屏10到透鏡22的光程d幾近相同，但由於在第4A圖至第4E圖實施例中，顯示屏10到人眼的光路是經過多次反射加總而得到的，因此實際上從顯示屏10到人眼的長度會遠小於第1圖中從顯示屏10到人眼24的長度，達到縮短光學系統之長度的目的。 This creation uses the principle of polarization to internally refract and reflect the light path in the optical system to achieve the effect of shortening the distance between the display screen and the human eye. Taking Figures 4A to 4E as examples, polarized light is emitted from the display screen 10. The optical path of the optical element in front of the human eye 24 has undergone multiple reflections. Assume that the length of each reflection of light from the display screen 10 to the optical element in front of the human eye 24 in the embodiment shown in Fig. 4A to Fig. 4E The total optical path length is d, which is almost the same as the optical path length d from the display screen 10 to the lens 22 in the prior art shown in FIG. The optical path of the eye is obtained through the sum of multiple reflections. Therefore, the length from the display screen 10 to the human eye is actually much smaller than the length from the display screen 10 to the human eye 24 in the first figure, so as to shorten the length of the optical system. the goal of.

綜上所述，本創作所提供之超短距目鏡系統利用對於光線進行多次的相位延遲和反射，實現超短距的光學架構，同時，藉由在此架構上搭配三透鏡進行焦距調節，可在短距離、大視場下達到良好之像差性能與影像品質。再者，本創作所提供之超短距目鏡系統可用於近視調節的功能，成像範圍為：Φ7mm~Φ52mm，適用屏幕0.3吋~3吋，提供小尺寸屏幕更高的影像品質，且由於目鏡系統之長度縮短，故應用光學系統之產品可達到輕薄、微型化之目的，特別可適用於頭戴顯示器、遊戲機等產品上的廣角鏡頭或廣角目鏡。 In summary, the ultra-short-range eyepiece system provided by this creation uses multiple phase delays and reflections of light to achieve an ultra-short-range optical architecture. At the same time, by combining this architecture with three lenses to adjust the focal length, It can achieve good aberration performance and image quality under short distance and large field of view. Furthermore, the ultra-short-range eyepiece system provided by this creation can be used for myopia adjustment. The imaging range is: Φ7mm~Φ52mm, suitable for screens from 0.3 inches to 3 inches, providing higher image quality for small screens, and due to the eyepiece system The length is shortened, so products using optical systems can achieve the purpose of lightness, thinness and miniaturization, especially suitable for wide-angle lenses or wide-angle eyepieces on head-mounted displays, game consoles and other products.

唯以上所述者，僅為本創作之較佳實施例而已，並非用來限定本創作實施之範圍。故即凡依本創作申請範圍所述之特徵及精神所為之均等變化或修飾，均應包括於本創作之申請專利範圍內。 Only the above are only the preferred embodiments of this creation, and they are not used to limit the scope of implementation of this creation. Therefore, all equivalent changes or modifications made in accordance with the characteristics and spirit of the application scope of this creation shall be included in the scope of patent application of this creation.

10:顯示屏 10: Display

12:反射式偏振片 12: Reflective polarizer

14:第一相位延遲片 14: The first phase retarder

18:第二相位延遲片 18: The second phase retarder

20:線偏振片 20: Linear polarizer

22:透鏡 22: lens

24:人眼 24: Human Eye

26:平板玻璃 26: flat glass

30:第一透鏡 30: The first lens

32:第二透鏡 32: second lens

34:第三透鏡 34: third lens

Claims

一種超短距目鏡系統，包括：一顯示屏，輸出影像並發出光線；一光學模組，包括：一反射式偏振片，對應該顯示屏設置，接收來自該顯示屏之該光線，並使該光線部分穿透、部分反射；一第一相位延遲片，對應該反射式偏振片設置，接收部分穿透該反射式偏振片之該光線，並進行第一次相位延遲；一部分穿透部分反射元件，對應該第一相位延遲片設置，使經該第一次相位延遲之該光線，部分穿透該部分穿透部分反射元件，部分則反射回該第一相位延遲片進行第二次及第三次相位延遲；一第二相位延遲片，對應該部分穿透部分反射元件設置，接收部分穿透該部分穿透部分反射元件且經過該第二、第三次相位延遲之該光線，並進行第四次相位延遲；以及一線偏振片，對應該第二相位延遲片設置，用以讓只經過兩次相位延遲的該光線不要通過並只讓經過四次相位延遲之該光線通過；以及複數透鏡，包括一第一透鏡、一第二透鏡及一第三透鏡，分別設置於該光學模組中至少一者之任一側，將該顯示屏所輸出之該影像導入至少一人眼中，且該第三透鏡為最靠近該顯示屏之透鏡，該第一透鏡為最靠近該人眼之透鏡；該超短距目鏡系統係滿足下列條件(1)和(2)： (1)0.4

2.6；及 (2)0.03

+

+

0.15；其中，f₁為該第一透鏡之有效焦距；f₂為該第二透鏡之有效焦距；f₃為該第三透鏡之有效焦距；F為該超短距目鏡系統之有效焦距；R₁為該第一透鏡靠近該人眼之一側之曲率半徑；R₂為該第一透鏡靠近該顯示屏之一側之曲率半徑；R₃為該第二透鏡靠近該人眼之一側之曲率半徑；R₄為該第二透鏡靠近該顯示屏之一側之曲率半徑；R₅為該第三透鏡靠近該人眼之一側之曲率半徑；及R₆為該第三透鏡靠近該顯示屏之一側之曲率半徑。 An ultra-short-distance eyepiece system includes: a display screen, which outputs images and emits light; an optical module, including: a reflective polarizer, corresponding to the setting of the display screen, receives the light from the display screen, and makes the The light partially penetrates and partially reflects; a first phase retarder is set corresponding to the reflective polarizer, receives the light partially penetrating the reflective polarizer, and performs the first phase retardation; part penetrates the partially reflective element , Corresponding to the arrangement of the first phase retarder, so that the light after the first phase retardation partly penetrates the part through the partial reflective element, and part is reflected back to the first phase retarder for the second and third times A second phase retardation; a second phase retardation plate is set corresponding to the partially penetrating partially reflective element, receiving the light partially penetrating the partially penetrating partially reflective element and passing through the second and third phase delays, and performing the second and third phase retardation Four-time phase retardation; and a linear polarizer, corresponding to the second phase retarder, to prevent the light that has only passed two phase retardations from passing through and only let the light that has passed four-time phase retardation pass through; and a complex lens, It includes a first lens, a second lens, and a third lens, which are respectively arranged on any side of at least one of the optical modules, and lead the image output by the display screen into at least one person's eye, and the third lens The lens is the lens closest to the display screen, and the first lens is the lens closest to the human eye; the ultra-short-range eyepiece system satisfies the following conditions (1) and (2): (1) 0.4

2.6; and (2) 0.03

+

0.15; where f _{1 is} the effective focal length of the first lens; f _{2 is} the effective focal length of the second lens; f _{3 is} the effective focal length of the third lens; F is the effective focal length of the ultra-short eyepiece system; R _{1 is} the radius of curvature of the first lens near the side of the human eye; R _{2 is} the curvature radius of the first lens near the side of the display screen; R _{3 is} the second lens near the side of the human eye Radius of curvature; R _{4 is} the radius of curvature of the second lens near the side of the display screen; R _{5 is} the radius of curvature of the third lens near the side of the human eye; and R _{6 is} the third lens near the display The radius of curvature of one side of the screen.

如請求項1所述之超短距目鏡系統，其中該些透鏡包括單片透鏡或多片式透鏡。 The ultra-short-distance eyepiece system according to claim 1, wherein the lenses include a single lens or a multi-piece lens.

如請求項2所述之超短距目鏡系統，其中該單片透鏡為球面透鏡、非球面透鏡或菲涅爾透鏡。 The ultra-short-range eyepiece system according to claim 2, wherein the single lens is a spherical lens, an aspheric lens or a Fresnel lens.

如請求項2所述之超短距目鏡系統，其中該多片式透鏡是由球面透鏡、非球面透鏡和菲涅爾透鏡中的至少一種所構成。 The ultra-short-range eyepiece system according to claim 2, wherein the multi-element lens is composed of at least one of a spherical lens, an aspheric lens and a Fresnel lens.

如請求項1所述之超短距目鏡系統，更滿足下列條件(3)~(6)中任一者： (3)0

0.15； (4)0

，0

； (5)0.8

1.5；及 (6)0.7

1.3；其中，f _s4為該部分穿透部分反射元件反射面之焦距；f _s5為該反射式偏振片反射面之焦距；TTL為該超短距目鏡系統之總長；及ω為該超短距目鏡系統之半場視角。 The ultra-short-range eyepiece system described in claim 1 further satisfies any of the following conditions (3)~(6): (3)0

0.15; (4)0

, 0

; (5)0.8

1.5; and (6) 0.7

1.3; Among them, f _{s 4} is the focal length of the reflective surface of the partially penetrating part of the reflective element; f _{s 5} is the focal length of the reflective surface of the reflective polarizer; TTL is the total length of the ultra-short distance eyepiece system; and ω is the ultra-short distance eyepiece system. Half-field viewing angle of short-range eyepiece system.

如請求項1所述之超短距目鏡系統，其中該反射式偏振片、該第一相位延遲片、該部分穿透部分反射元件、該第二相位延遲片和該線偏振片中至少一者為薄膜材料或光學鍍膜，並以塗佈、鍍膜或黏合的方式設置於該些透鏡中至少一者或至少一平板玻璃上。 The ultra-short-distance eyepiece system according to claim 1, wherein at least one of the reflective polarizer, the first phase retarder, the partially penetrating partially reflective element, the second phase retarder, and the linear polarizer It is a thin film material or an optical coating, and is arranged on at least one of the lenses or at least one flat glass by coating, coating or bonding.

如請求項1所述之超短距目鏡系統，其中該部分穿透部分反射元件所反射回該第一相位延遲片之該光線經過該第一相位延遲片的該第二次相位延遲後，通過該第一相位延遲片到達該反射式偏振片，並在該反射式偏振片上完成反射，讓該光線再反射回該第一相位延遲片進行該第三次相位延遲，接著該光線穿過該第一相位延遲片及該部分穿透部分反射元件到達該第二相位延遲片。 The ultra-short-distance eyepiece system according to claim 1, wherein the light that partially penetrates the partially reflective element and is reflected back to the first phase retarder passes through the second phase retardation of the first phase retarder. The first phase retarder reaches the reflective polarizer and completes reflection on the reflective polarizer, so that the light is reflected back to the first retarder for the third phase retardation, and then the light passes through the first phase retarder. A phase retarder and the partly penetrating part of the reflective element reach the second phase retarder.

如請求項1所述之超短距目鏡系統，其中該第一、第二、第三、第四次相位延遲皆增加四分之一波長的奇數倍的相位延遲，使到達該人眼之光線共延遲一個波長的整數倍。 The ultra-short-distance eyepiece system according to claim 1, wherein the first, second, third, and fourth phase delays are all increased by an odd multiple of a quarter-wavelength, so as to reach the human eye The light is delayed by an integer multiple of a wavelength.

如請求項1所述之超短距目鏡系統，其中該顯示屏送出並進入該反射式偏振片之該光線為線偏振光。 The ultra-short-distance eyepiece system according to claim 1, wherein the light emitted from the display screen and entering the reflective polarizer is linearly polarized light.

如請求項9所述之超短距目鏡系統，其中該線偏振光經過該第一相位延遲片後轉換成左圓偏振光或右圓偏振光。 The ultra-short-distance eyepiece system according to claim 9, wherein the linearly polarized light is converted into left circularly polarized light or right circularly polarized light after passing through the first phase retarder.

如請求項1所述之超短距目鏡系統，其中該顯示屏送出並進入該反射式偏振片之該光線為圓偏振光，於該顯示屏與該反射式偏振片之間更設有一第三相位延遲片或一圓偏振片，使該圓偏振光經過該第三相位延遲片或該圓偏振片後轉換為線偏振光。 The ultra-short-distance eyepiece system according to claim 1, wherein the light emitted from the display screen and entering the reflective polarizer is circularly polarized light, and a third lens is further provided between the display screen and the reflective polarizer. Phase retarder or a circular polarizer, so that the circularly polarized light passes through the third phase retarder or the The circular polarizer is then converted to linearly polarized light.

如請求項1所述之超短距目鏡系統，其中該顯示屏送出並進入該反射式偏振片之該光線為非偏振光，於該顯示屏與該反射式偏振片之間更設有另一線偏振片，使該非偏振光經過該另一線偏振片後轉換為線偏振光。The ultra-short-distance eyepiece system according to claim 1, wherein the light emitted from the display screen and entering the reflective polarizer is unpolarized light, and another line is further provided between the display screen and the reflective polarizer The polarizer makes the non-polarized light pass through the other linear polarizer and convert it into linearly polarized light.