Far image optical system and display device

Abstract

The utility model relates to the technical field of optics, in particular to a far image optical system and a display device, and the far image optical system comprises an image source providing structure which comprises a display screen and a light angle control film used for adjusting the light emitting angle of the image source, and the light angle control film and a display panel of the display screen are arranged at an interval; the far image optical assembly comprises a light ray processing structure, a light ray adjusting structure and a reflecting device, and the light ray processing structure is arranged on the light emitting path of the image source providing structure and located on the side, away from the backlight layer, of the display panel; the light adjusting structure is located on a transmission light path of the light processing structure and is obliquely arranged; the reflecting device is arranged on a reflecting light path of the light adjusting structure. According to the utility model, through the arrangement of the image source providing structure with the light angle control film, the light emitting angle of the image source is accurately controlled, and the problem of stray light caused by large-angle light entering the system is effectively prevented, so that the formation of stray light is obviously reduced, and the imaging effect is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of telecentric optical technology, in particular to a telecentric optical system and a display device. Background Art

[0002] In the existing optical technology, there are deficiencies in the processing of image source light rays. On the one hand, the angle control of the image source light rays is not precise enough, and large-angle image source light rays are likely to enter the optical system, reducing the contrast and clarity of the image. On the other hand, the existing telecentric optical system is also unsatisfactory in the processing of stray light, further affecting the imaging effect. Therefore, it is necessary to improve the existing technology.

[0003] The above information is given as background information only to assist in understanding the present disclosure, and it is not determined or admitted whether any of the above content can be used as the prior art relative to the present disclosure. Summary of the Utility Model

[0004] The utility model provides a telecentric optical system and a display device to solve the problems existing in the prior art.

[0005] To achieve the above object, the utility model provides the following technical solutions:

[0006] A telecentric optical system includes:

[0007] An image source providing structure, including a display screen for emitting image source light rays, and a light ray angle control film for adjusting the emission angle of the image source light rays. The display screen includes a display panel and a backlight layer, and the light ray angle control film is disposed at an interval from the display panel;

[0008] A telecentric optical component, including a light ray processing structure, a light ray adjustment structure, and a reflection device. The light ray processing structure is disposed on the light-emitting optical path of the image source providing structure and on the side of the display panel away from the backlight layer; the light ray adjustment structure is disposed on the transmitted light optical path of the light ray processing structure and is inclined; the reflection device is disposed on the reflected light optical path of the light ray adjustment structure.

[0009] Optionally, the light ray angle control film is placed between the display panel and the backlight layer of the display screen;

[0010] The numerical range of the distance between the display panel of the display screen and the light ray angle control film is 0.2 mm - 0.9 mm.

[0011] Optionally, the light ray angle control film is placed between the display panel of the display screen and the light ray processing structure;

[0012] The numerical range of the distance between the display panel of the display screen and the light angle control film is 0.2 mm - 0.9 mm.

[0013] Optionally, the value range of the viewing angle Deg of the light angle control film is 40° < Deg < 90°.

[0014] Optionally, the light processing structure includes an optical lens and also includes a first quarter-wave plate located between the optical lens and the image source providing structure;

[0015] The first quarter-wave plate is disposed on the side of the image source providing structure close to the optical lens, or the first quarter-wave plate is disposed on the side of the optical lens close to the image source providing structure;

[0016] The first quarter-wave plate has inverse wavelength dispersion and is used to make light enter the light adjustment structure in a circularly polarized state;

[0017] The optical lens is a biconcave lens, a plano-concave lens or a convex-concave lens.

[0018] Optionally, the light adjustment structure includes a second quarter-wave plate, a reflective polarizing film and a glass plate disposed obliquely to the optical axis of the image source light, and the second quarter-wave plate, the reflective polarizing film and the glass plate are glued to each other in pairs;

[0019] The second quarter-wave plate, the reflective polarizing film and the glass plate are arranged in sequence along the incident direction of the image source light.

[0020] Optionally, the light adjustment structure further includes an absorption-type polarizer, and the absorption-type polarizer is located between the reflective polarizing film and the glass plate, or the absorption-type polarizer is located on the side of the glass plate away from the reflective polarizing film.

[0021] Optionally, the light adjustment structure further includes a first anti-reflection film located on the side of the light adjustment structure close to the reflection device, and a second anti-reflection film located on the side of the light adjustment structure away from the reflection device;

[0022] The anti-reflection film is disposed on the light adjustment structure by means of bonding or coating.

[0023] The present utility model further provides a display device, including the far-image optical system described in any one of the above, and a structural bracket. The structural bracket has a hollow structure, and the image source providing structure, the far-image optical component and the reflection device are located inside the structural bracket;

[0024] On the inner wall of the structural support, an absorbing structure is provided at least in the area between the light processing structure and the light adjustment structure; the absorbing structure has the following characteristics: for light with an incident angle greater than 40°, the reflectivity is controlled within a range less than 1%.

[0025] Compared with the prior art, the present utility model has the following beneficial effects:

[0026] A telecentric optical system and a display device provided by the present utility model can accurately control the light exit angle of the image source by providing an image source providing structure with a light angle control film, effectively preventing the problem of stray light generated by large-angle light entering the system, thereby significantly reducing the formation of stray light and further improving the imaging effect.

[0027] The present utility model has other characteristics and advantages, which will be obvious from the accompanying drawings incorporated herein and the subsequent detailed description, or will be described in detail in the accompanying drawings incorporated herein and the subsequent detailed description, and these accompanying drawings and detailed description are used together to explain the specific principles of the present utility model. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 is a schematic structural diagram of a telecentric optical system provided by the present utility model;

[0030] Figure 2 is a schematic diagram of the setting position of the light angle control film in a telecentric optical system provided by the present utility model;

[0031] Figure 3 is another schematic diagram of the setting position of the light angle control film in a telecentric optical system provided by the present utility model;

[0032] Figure 4 is a schematic diagram of the viewing angle Deg of the light angle control film in a telecentric optical system provided by the present utility model;

[0033] Figure 5 is a schematic diagram of the direction of the viewing angle Deg of the light angle control film in a telecentric optical system provided by the present utility model;

[0034] Figure 6It is a schematic diagram of large-angle light generated by a display screen in a telecentric optical system provided by the present utility model;

[0035] Figure 7 It is another schematic structural diagram of a telecentric optical system provided by the present utility model;

[0036] Figure 8 It is a schematic structural diagram of a light ray adjustment structure in a telecentric optical system provided by the present utility model;

[0037] Figure 9 It is a schematic diagram of stray light formed in a display device provided by the present utility model;

[0038] Figure 10 It is a schematic structural diagram of a display device after hiding the reflection device provided by the present utility model;

[0039] Figure 11 It is a schematic structural diagram of a display device after setting an absorbing structure provided by the present utility model.

[0040] Reference numerals: 10, image source providing structure; 11, display panel; 12, backlight layer; 13, light ray angle control film; 20, light ray processing structure; 21, optical lens; 22, first quarter-wave plate; 30, light ray adjustment structure; 31, second quarter-wave plate; 32, reflective polarizing film; 33, glass plate; 34, absorption type polarizer; 35, first antireflection film; 36, second antireflection film; 50, structural bracket; 51, absorbing structure. Detailed implementation manners

[0041] To illustrate in detail the possible application scenarios, technical principles, specific implementable solutions, achievable purposes and effects, etc. of the present application, the following is described in detail with reference to the specific examples listed and in conjunction with the drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0042] Referring to "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form the corresponding implementable technical solution.

[0043] Unless otherwise defined, the meanings of technical terms used herein are the same as those commonly understood by those skilled in the technical field to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0044] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that there can be three relationships. For example, A and / or B means: the existence of A, the existence of B, and the simultaneous existence of both A and B. Additionally, the character " / " herein generally represents an "or" logical relationship between the associated objects before and after.

[0045] In this application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantitative, primary-secondary, or sequential relationships between these entities or operations.

[0046] Without further limitations, in this application, the expressions "comprising", "including", "having", or other similar expressions used in a statement are intended to cover non-exclusive inclusion. These expressions do not exclude the possibility that there may be additional elements in the process, method, or product that includes the described elements. Thus, a process, method, or product that includes a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such a process, method, or product.

[0047] Similar to the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", "exceeding", etc. are understood not to include the number itself; expressions such as "above", "below", "within", etc. are understood to include the number itself. In addition, in the description of the embodiments of this application, the meaning of "multiple" is two or more (including two). Similar expressions related to "many", such as "multiple groups", "multiple times", etc., are understood in the same way, unless otherwise specifically defined.

[0048] In the description of the embodiments of this application, spatial-related expressions such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiment or the drawing. This is only for the convenience of describing the specific embodiments of this application or for the reader's understanding, and does not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of this application.

[0049] Unless otherwise clearly specified or defined, in the description of the embodiments of the present application, the terms such as "installation", "connection", "linkage", "fixation", "setting" and the like shall be understood in a broad sense. For example, the "connection" may be a fixed connection, a detachable connection, or an integral setting; it may be a mechanical connection, an electrical connection, or a communication connection; it may be a direct connection, or an indirect connection through an intermediate medium; it may be the communication inside two components or the interaction relationship between two components. For those skilled in the art to which the present application pertains, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0050] Please refer to Figure 1 , the present utility model provides a telecentric optical system, including an image source providing structure 10, a telecentric optical component, and a reflection device.

[0051] The image source providing structure 10 includes a display screen for emitting image source light rays, and a light ray angle control film 13 for adjusting the emission angle of the image source light rays. The display screen includes a display panel 11 and a backlight layer 12. The light ray angle control film 13 is disposed at an interval from the display panel 11, and the emission angle of the image source light rays is controlled through the light ray angle control film 13, so as to prevent large-angle image source light rays from entering the optical system and generating stray light problems.

[0052] Among them, please refer to Figure 2 , when the light ray angle control film 13 is disposed between the display panel 11 and the backlight layer 12, the numerical range of the distance D1 between the display panel 11 of the display screen and the light ray angle control film 13 is 0.2 mm - 0.9 mm; please refer to Figure 3 , when it is disposed between the display panel 11 and the light processing structure 20, the numerical range of the distance D2 between the display panel 11 of the display screen and the light ray angle control film 13 is 0.2 mm - 0.9 mm.

[0053] Further, please refer to Figures 4 to 6 , which shows the viewing angle Deg of the light ray angle control film 13. The viewing angle Deg of the light ray angle control film 13 is the included angle of the maximum emitted light rays of the image source; as Figure 4 , Figure 5 shown, the direction of the viewing angle Deg of the light ray angle control film 13 is defined as: taking the long axis of the display screen as the 3 - 9 o'clock direction, then the short axis of the display screen is the 6 - 12 o'clock direction, and the viewing angle Deg of the light ray angle control film 13 is the included angle of the maximum emitted light rays in the 6 - 12 o'clock direction.

[0054] As Figure 6As shown, since the large-angle emitted light of the display screen directly incident on the reflection device will cause the problem of stray light, the present utility model controls the emission angle of the image source light by setting a light control film to prevent the large-angle light of the display screen from directly incident on the reflection device and generating stray light.

[0055] Specifically, the viewing angle Deg of the light angle control film 13 satisfies 40° < Deg < 90°, so as to effectively solve the problem of stray light.

[0056] The telecentric optical system further includes a telecentric optical component. The telecentric optical component is located on the optical path of the image source light, and includes a light processing structure 20, a light adjustment structure 30, and a reflection device 40. The light processing structure 20 is disposed on the light-emitting optical path of the image source providing structure 10, and the light processing structure 20 is disposed on the side of the display panel 11 away from the backlight layer 12; the light adjustment structure 30 is disposed on the transmitted light optical path of the light processing structure 20 and is inclined; the reflection device 40 is disposed on the reflected light optical path of the light adjustment structure 30.

[0057] Specifically, please refer to Figure 7 , the light processing structure 20 includes an optical lens 21, and the optical lens 21 can be a double concave lens, a plano-concave lens, or a convex-concave lens. The light processing structure 20 further includes a first quarter-wave plate 22. The first quarter-wave plate 22 has inverse wavelength dispersion and is used to make the light enter the light adjustment structure 30 in a circularly polarized state.

[0058] Among them, the first quarter-wave plate 22 is disposed on the side of the image source providing structure 10 close to the optical lens 21; or as shown in Figure 8 , the first quarter-wave plate 22 is disposed on the side of the optical lens 21 close to the image source providing structure 10. Among them, the first quarter-wave plate can be adhered to the side of the image source providing structure 10 close to the optical lens 21 or the side of the optical lens 21 close to the image source providing structure 10 through a transparent optical adhesive.

[0059] Please refer to Figure 1 , Figure 7 and Figure 8 , the light adjustment structure 30 includes a second quarter-wave plate 31, a reflective polarizing film 32, and a glass plate 33. The second quarter-wave plate 31, the reflective polarizing film 32, and the glass plate 33 are arranged in sequence along the incident direction of the image source light, and the second quarter-wave plate 31, the reflective polarizing film 32, and the glass plate 33 are glued to each other. Among them, the thickness of the optical adhesive between the second quarter-wave plate 31, the reflective polarizing film 32, and the glass plate 33 can be 1um - 20um.

[0060] In addition, the light adjustment structure 30 further includes an absorption type polarizer 34, which is located between the reflective polarizing film 32 and the glass plate 33, or as shown in Figure 8 on the side of the glass plate 33 away from the reflective polarizing film 32.

[0061] Furthermore, the light adjustment structure 30 further includes a first anti-reflection film 35 located on the side close to the reflection device, and a second anti-reflection film 36 located on the side away from the reflection device. The anti-reflection film can be provided on the light adjustment structure 30 by bonding or coating.

[0062] The s-line polarized light emitted by the image source light passes through the first quarter-wave plate 22 and becomes left-circularly polarized light. After being modulated by the optical lens 21, it passes through the second quarter-wave plate 31 of the light adjustment structure 30 and becomes s-line polarized light again, then is reflected by the reflective polarizing film 32. It passes through the second quarter-wave plate 31 again and is converted into left-circularly polarized light, and then is reflected by the reflection device 40 and converted into right-circularly polarized light. After passing through the second quarter-wave plate 31, it becomes P-line polarized light and is received by the human eye through the light adjustment structure 30.

[0063] In the present utility model, the PBS (Polarizing Beam Splitter) scheme is used, and the light angle control film 13 is provided to accurately control the exit angle of the image source light, effectively preventing the problem of stray light generated by large-angle light entering the system, thereby significantly reducing the formation of stray light and further improving the imaging effect.

[0064] In addition, the quarter-wave plate with inverse wavelength dispersion makes light of different wavelengths generate a specific phase difference with the same trend as the wavelength change when passing through, so as to convert linearly polarized light into circularly polarized light within a certain wavelength range to better cooperate with subsequent optical elements.

[0065] Furthermore, in this embodiment, the reflection device is used to reflect the image source light into a predetermined optical path. In the telecentric optical system, this optical path is the path that finally enters the human eye. Specifically, after being processed by the image source providing structure 10, the light processing structure 20, the light adjustment structure 30 and being reflected by the reflection device, the image source light propagates along a specific path and enters the human eye so that the human eye can see the processed image source image.

[0066] Specifically, the reflection device has an arc-shaped structure.

[0067] Embodiment 1

[0068] In Embodiment 1 of the present invention, the conditions satisfied by the telecentric optical system are as follows:

[0069] The light angle control film 13 is disposed between the display panel 11 of the display screen and the light processing structure 20; the numerical range of the distance between the display panel 11 of the display screen and the light angle control film 13 is 0.4 mm to 0.7 mm;

[0070] The viewing angle Deg of the light angle control film 13 ranges from 40° < Deg < 90°;

[0071] On the inner wall of the structural support 50, an absorbing structure 51 is provided at least in the area between the light processing structure 20 and the light adjustment structure 30; the absorbing structure 51 has the following characteristics: for light with an incident angle greater than 40°, the reflectivity is controlled within a range less than 1%, preferably within 0.2%;

[0072] The viewing angle Deg of the light angle control film 13 ranges from 40° to 90°, and further, the viewing angle Deg of the light angle control film 13 preferably ranges from 55° to 65°.

[0073] Embodiment 2

[0074] Please refer to Figure 9 and Figure 10 , based on the foregoing embodiments, an embodiment of the present invention provides a display device, including the far - image optical system in the above embodiments, and further including a structural support 50, the structural support is of a hollow structure, and the image source providing structure 10, the far - image optical component, and the reflection device are located inside the structural support.

[0075] On the inner wall of the structural support 50, an absorbing structure 51 is provided at least in the area between the light processing structure 20 and the light adjustment structure 30; the absorbing structure 51 has the following characteristics: for light with an incident angle greater than 40°, the reflectivity is controlled within a range less than 1%.

[0076] As Figure 9 shown, after the image source light passes through the light processing structure 20, part of the light is incident on the inner wall of the structural support 50 between the light processing structure 20 and the light adjustment structure 30. Since the incident angle of the light is relatively large at this time and the reflectivity of the inner wall of the structural support 50 is relatively high, additional stray light will be generated when the light enters a specific optical path after being reflected by the inner wall of the structural support 50, thus affecting the display quality.

[0077] As Figure 10 , Figure 11As shown in the figure, an absorbing structure 51 is provided on the inner wall of the structural support 50 between the light processing structure 20 and the light adjustment structure 30. Specifically, the absorbing structure 51 is provided on the inner wall of the structural support 50 between the bottom of the light processing structure 20 and the top of the light adjustment structure 30, and the absorbing structure 51 is formed by attaching a light-absorbing cloth or spraying light-absorbing ink. By adding the absorbing structure 51, the reflection on the inner wall of the structural support 50 is eliminated, preventing the light from the image source from being reflected by the inner wall of the structural support 50 after passing through the light processing structure 20 and generating additional stray light.

[0078] It can be understood that the structural support 50 provides stable support and protection for the entire system, while the absorbing structure 51 effectively reduces the interference of stray light, having good visual effects and anti-stray light performance.

[0079] Among them, each component in the telecentric optical system works together to ensure that the light from the image source is presented to the user in a clear and stable state after being precisely processed and adjusted. At the same time, the design of the structural support 50 provides stable support and protection for the entire system, and the absorbing structure 51 effectively reduces the interference of stray light and improves the display quality.

[0080] Compared with the prior art, the present utility model has the following beneficial effects:

[0081] A telecentric optical system and a display device provided by the present utility model precisely control the exit angle of the light from the image source by providing an image source providing structure 10 with a light angle control film 13, effectively preventing the problem of stray light generated by large-angle light entering the system, thereby significantly reducing the formation of stray light and further improving the imaging effect.

[0082] Finally, it should be noted that although the above embodiments have been described in the text and drawings of the specification of the present application, the patent protection scope of the present application cannot be limited thereby. Any technical solutions obtained by equivalent structure or equivalent process substitution or modification based on the substantial concept of the present application, using the content recorded in the text and drawings of the specification of the present application, and any technical solutions directly or indirectly implementing the above embodiments in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A telescopic optical system, characterized in that: include: An image source providing structure includes a display screen for emitting image source light and a light angle control film for adjusting the emission angle of the image source light, wherein the display screen includes a display panel and a backlight layer, and the light angle control film is spaced apart from the display panel; A telephoto optical component, comprising a light processing structure, a light adjustment structure and a reflective device, wherein the light processing structure is arranged on the light output path of the image source providing structure and the light processing structure is arranged on a side of the display panel away from the backlight layer; The light adjustment structure is arranged on the transmission light path of the light processing structure and is arranged obliquely; the reflection device is arranged on the reflection light path of the light adjustment structure.

2. The telephoto optical system according to claim 1, characterized in that: The light angle control film is placed between the display panel and the backlight layer of the display screen; The numerical range of the distance between the display panel of the display screen and the light angle control film is 0.2mm-0.9mm.

3. The telescopic optical system according to claim 1, characterized in that: The light angle control film is placed between the display panel of the display screen and the light processing structure; The numerical range of the distance between the display panel of the display screen and the light angle control film is 0.2mm-0.9mm.

4. The telescopic optical system according to claim 1, characterized in that: The value range of the viewing angle Deg of the light angle control film is 40°<Deg<90°.

5. The telescopic optical system according to claim 1, characterized in that: The light processing structure includes an optical lens and a first quarter wave plate located between the optical lens and the image source providing structure; The first quarter wave plate is arranged on a side of the image source providing structure close to the optical lens, or the first quarter wave plate is arranged on a side of the optical lens close to the image source providing structure; The first quarter wave plate has inverse wavelength dispersion and is used to allow light to enter the light adjustment structure in a circularly polarized state; The optical lens is a biconcave lens, a plano-concave lens or a concave-convex lens.

6. The telescopic optical system according to claim 5, characterized in that: The light adjustment structure includes a second quarter wave plate, a reflective polarizing film and a glass plate which are arranged obliquely to the optical axis of the image source light; the second quarter wave plate, the reflective polarizing film and the glass plate are glued together in pairs; the second quarter wave plate, the reflective polarizing film and the glass plate are arranged in sequence along the incident direction of the image source light.

7. The telescopic optical system according to claim 6, characterized in that: The light adjustment structure further includes an absorbing polarizer, which is located between the reflective polarizing film and the glass plate, or the absorbing polarizer is located on a side of the glass plate away from the reflective polarizing film.

8. The telephoto optical system according to claim 6, characterized in that: The light adjustment structure further comprises a first anti-reflection film located on a side of the light adjustment structure close to the reflective device, and a second anti-reflection film located on a side of the light adjustment structure away from the reflective device; The anti-reflection film is arranged on the light adjustment structure by lamination or coating.

9. A display device, comprising the telescopic optical system according to any one of claims 1 to 8, and a structural support, characterized in that: The structural support is a hollow structure, and the image source providing structure and the telescopic optical component are located inside the structural support; On the inner wall of the structural support, a light absorbing structure is arranged at least in the area between the light processing structure and the light adjusting structure; the light absorbing structure has the following characteristics: for light with an incident angle greater than 40°, the reflectivity is controlled within a range of less than 1%.

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