Head-mounted display and its display device

Abstract

To provide a head-mounted display and its display device.SOLUTION: A display device includes a display and an image focus adjustment device. The display includes multiple partition walls. The partition walls transmit multiple image beams having multiple different polarization directions each. The image focus adjustment device and the display are disposed adjacently. The image focus adjustment device adjusts each polarization state of each image beam and focal length of each image beam.EFFECT: Multiple parts of a display image can have image-forming surfaces of different depth of field each, and can effectively produce an image display effect having multiple depths of field.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a head mounted display and a display device thereof, and more particularly to a head mounted display and a display device thereof capable of generating display images with multiple depths of field. [Background technology]

[0002] Whether or not dizziness can be reduced in virtual reality head-mounted displays (VR HMDs) (or smart eyewear) is a very important indicator in optical products. Therefore, there is much discussion about the design of multiple depths. For example, to solve the problem of vergence-accommodation conflict, the use of multiple image planes can effectively reduce the visual discomfort when wearing a head-mounted display. However, the structure of a multi-depth display often requires many components and an increase in the volume of the components, making it difficult to balance the three factors of preventing visual dizziness and comfort, the pursuit of lightness and comfort when worn, and the cost that consumer electronics can bear. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention provides a head mounted display capable of generating display images having multiple depths of field, and a display device thereof. [Means for solving the problem]

[0004] The display device of the present invention includes a display and an image focusing device. Sub-area has. Sub-areaa first polarizing beam splitter that splits the image beam into a first polarizing beam and a second polarizing beam splitter that splits the image beam into a second polarizing beam and a third ...

[0005] A head mounted display of the present invention includes a main body and the above-described display device. Effect of the Invention

[0006] Based on the above, the display device of the present invention comprises a plurality of Sub-area In the present invention, by using a display capable of generating multiple image beams each having multiple different polarization states, and further cooperating with a polarization selective mirror that adjusts the focal length of each image beam according to the respective polarization state of each image beam, multiple portions of the displayed image can each have imaging planes with different depths of field, effectively creating an image display effect with multiple depths of field. [Brief description of the drawings]

[0007] [Figure 1] 1 shows a schematic diagram of a display device according to an embodiment of the present invention; [Diagram 2] FIG. 2 shows a schematic diagram of a display implementation in a display device in accordance with one embodiment of the present invention. [Diagram 3] 2 shows a schematic diagram of an implementation of an image focusing device for a display device according to an embodiment of the present invention; [Figure 4A] 2 shows a schematic diagram of an implementation of an image focusing device for a display device according to an embodiment of the present invention; [Figure 4B] 2 shows a schematic diagram of an implementation of an image focusing device for a display device according to an embodiment of the present invention; [Figure 5A] 1 shows a schematic diagram of a display device according to another embodiment of the present invention. [Figure 5B] 3 shows optical path diagrams of image beams with different polarization directions in a display device. [Figure 5C] 3 shows optical path diagrams of image beams with different polarization directions in a display device. [Figure 6] 1 shows a schematic diagram of a head mounted display device according to one embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Referring to Fig. 1, Fig. 1 shows a schematic diagram of a display device according to an embodiment of the present invention. The display device 100 includes a display 110 and an image focusing device 120. The display 110 and the image focusing device 120 are disposed adjacent to each other and overlap each other. The display 110 includes a plurality of Sub-area The display 110 is used to generate a display image and has different Sub-area Different image beams IML1 and IML2 are transmitted at 111 and 112, respectively. Here, in this embodiment, the image beams IML1 and IML2 may have a plurality of different polarization directions.

[0009] The image focusing device 120 is used to receive the image beams IML1 and IML2 transmitted by the display 110. The image focusing device 120 can adjust the focal lengths of the image beams IML1 and IML2 respectively according to the polarization directions of the image beams IML1 and IML2. Because the polarization directions of the image beams IML1 and IML2 are different, the image focusing device 120 can make the image beams IML1 and IML2 have different focal lengths respectively. In this way, the image beams IML1 and IML2 can be imaged on two non-overlapping imaging planes respectively, and the display image can have the effect of multiple depths of field.

[0010] In this embodiment, the display 110 includes two or more Sub-area The two illustrated in FIG. Sub-area 111, 112 are merely illustrative examples and are not intended to limit the scope of the present invention.

[0011] Referring to FIG. 2, FIG. 2 shows a schematic diagram of a display implementation in a display device in one embodiment of the present invention. The display 200 includes a display panel 210, a polarizer 220, and a liquid crystal array substrate 230. The display panel 210 is used to generate a display image. The polarizer 220 and the display panel 210 are arranged to overlap each other and are used to receive the display image beam generated by the display panel 210. In this embodiment, the polarizer 220 can be a linear polarizer, and is used to convert the polarization direction of the display image beam generated by the display panel 210 to parallel to the linear transmission axis of the polarizer 220. In this embodiment, the polarizer 220 can be in contact with the surface on which the display panel 210 generates the display image beam.

[0012] The liquid crystal array substrate 230 and the polarizing plate 220 are disposed adjacent to each other. Sub-area The display panel 210 may have a polarizing plate 220 and a liquid crystal display plate 231 and a polarizing plate 222. Sub-area For 231 and 232, Sub-area Images DIM1 and DIM2 can be transmitted respectively. Sub-area 231 and 232 are sa Area The polarization directions of the images DIM1 and DIM2 are controlled, respectively, to generate image beams IML1 and IML2, respectively.

[0013] More specifically, the liquid crystal Sub-area 231 and 232 each receive a control voltage, and based on the received state of the control voltage, Sub-area It can be determined whether to adjust the polarization direction of the images DIM1 and DIM2. For example, Sub-area When 231 receives a control voltage, the liquid crystal Sub-area The liquid crystal array in 231 is deflected, Sub-area The image DIM1 passes directly through to generate the image beam IML1. Under these conditions, Sub-area The polarization direction of the image DIM1 is not adjusted and is maintained. Sub-area If 232 does not receive a control voltage, the LCD Sub-areaThe liquid crystal array in 232 is not deflected, Sub-area The polarization direction of the image DIM2 can be rotated by a predetermined angle to generate the image beam IML2. In this embodiment, the predetermined angle is, for example, 90 degrees. In this way, the image beams IML1 and IML2 can have different polarization directions.

[0014] As in the embodiment of FIG. 1, the liquid crystal array substrate 230 has a liquid crystal Sub-area The number of the liquid crystal display panels may be two or more. sa Area The liquid crystal array substrate 230 according to the embodiment of the present invention may be a twisted nematic (TN) liquid crystal array.

[0015] 3, which shows a schematic diagram of an implementation of an image focusing device of a display device according to an embodiment of the present invention. In this embodiment, the image focusing device 300 is a polarized path selection lens group. The image focusing device 300 can be used to adjust the traveling optical path of an image beam. The image focusing device 300 includes a first delay film 311, a beam splitter 312, a second delay film 313, a reflective linear polarizer 314, and a lens group 320. The first delay film 311 and the beam splitter 312 are arranged to overlap each other, and the first delay film 311 is used to receive an image beam from a display. The second delay film 313 and the reflective linear polarizer 314 are arranged to overlap each other. Here, the second delay film 313 has an entrance surface corresponding to the exit surface of the beam splitter 312. There may be a medium 330 between the second delay film 313 and the beam splitter 312. In this embodiment, medium 330 may be an air medium.

[0016] It should be noted that the reflective linear polarizer 314 can have different effects on image beams with different polarization directions. For example, the reflective linear polarizer 314 can have a reflection effect on an image beam with a first polarization direction, and the reflective linear polarizer 314 can have a transmission effect on an image beam with a second polarization direction, where the first polarization direction and the second polarization direction are different. Therefore, the reflective linear polarizer 314 can adjust the traveling optical path of the image beam based on the polarization direction of the image beam, and further adjust the focal length and imaging position of the image beam.

[0017] Specifically, when the image beam entering the image focusing device 300 is in a first polarization (linear polarization) direction, the first delay film 311 can convert the image beam into a first circular polarization, and the beam splitter 312 and the second delay film 313 can further convert the image beam into the first polarization direction. Furthermore, the reflective linear polarizer 314 can reflect the image beam in the first polarization direction, and the second delay film 313 converts the reflected image beam into the first circular polarization. Then, the image beam is sent to the beam splitter 312, and the beam splitter 312 can reflect the image beam having the first circular polarization state to the second delay film 313. At this time, the second delay film 313 converts the image beam into a second polarization (linear polarization) direction, so that the image beam passes through the reflective linear polarizer 314.

[0018] On the other hand, if the image beam entering the image focusing device 300 is in a second polarization (linear) direction, the image beam is converted to a second circular polarization by the first retardation film 311, and further converted to a second polarization direction by the beam splitter 312 and the second retardation film 313. In this way, the image beam can pass directly through the reflective linear polarizer 314.

[0019] In this embodiment, the first delay film 311 and the second delay film 313 may be 1 / 4 delay films.

[0020] Additionally, lens group 320 is disposed adjacent to the output surface of reflective linear polarizer 314. Lens group 320 is used to receive the image beam and generate a focused image.

[0021] As can be seen from the above description, the image focus adjustment device 300 performs different degrees of adjustment operations based on the traveling optical paths of image beams with different polarization directions, and focuses the image beams with different polarization directions on different imaging planes, thereby improving the depth of field level of the displayed image.

[0022] 4A, which shows a schematic diagram of an implementation method of an image focusing device of a display device according to an embodiment of the present invention. In this embodiment, the image focusing device 400 is a polarization directed lens. In this embodiment, the image focusing device 400 can be configured by a liquid crystal array substrate. The image focusing device 400 can have different focal lengths in different polarization states due to special liquid crystal orientation. In FIG. 4A, the focal length f is a value greater than 0, and the image focusing device 400 can focus the traveling optical path of the received image beam IML1.

[0023] 4B, the focal length f is less than 0, and the image focusing device 400 can defocus the optical path of the received image beam IML2, where the image beams IML1 and IML2 have different polarization directions.

[0024] 5A to 5C, FIG. 5A shows a schematic diagram of a display device according to another embodiment of the present invention. FIG. 5B and FIG. 5C respectively show optical path diagrams of image beams in different polarization directions in the display device. The display device 500 includes a display 510 and an image focusing device 520. The display 510 and the image focusing device 520 are disposed adjacent to each other. The display 510 includes a plurality of Sub-area Z1 and Z2 may be present, Sub-areaZ1 and Z2 can generate a plurality of image beams IML1 and IML2 having different polarization directions, respectively, where the polarization direction of the image beam IML1 and the polarization direction of the image beam IML2 are orthogonal to each other. Details of the traveling optical path P1 of the image beam IML1 can be as shown in FIG. 5B, where the image beam IML1 can travel by multiple refractions. Details of the traveling optical path P2 of the image beam IML2 can be as shown in FIG. 5C, where the image beam IML2 can travel by two reflections and multiple refractions.

[0025] By adjusting the traveling optical paths of the image beam IML1 and the image beam IML2 using the image focus adjustment device 520, the image beam IML1 can form a first virtual image on an image plane M1. The image beam IML2 can form a second virtual image on an image plane M2. Here, the image planes M1 and M2 do not overlap. With respect to the position of the observer's eyeball EYE, the first virtual image corresponding to the image beam IML1 may have an image distance d1, and the second virtual image corresponding to the image beam IML2 may have an image distance d2. Here, the image distance d1 is smaller than the image distance d2.

[0026] As can be seen from the above description, the display device 500 has a display 510 that is different Sub-region area The image beams having different polarization directions are generated for the displayed images, and the image focus adjustment device 520 performs an adjustment operation on the focal length of the image beams based on the polarization directions. In this way, different Sub-area The display objects corresponding to the different depths of field can be imaged on the imaging planes having different image distances. The display images generated by the display device 500 have multiple depths of field, which can effectively improve the display quality of the display images.

[0027] Referring now to Fig. 6, Fig. 6 shows a schematic diagram of a head-mounted display device according to one embodiment of the present invention. The head-mounted display device 600 includes a main body part 610 and a display device 620. The display device 620 is provided on the main body part 610 and is used to project a display image onto the user's eyeball EYE.

[0028] The display device 620 can be implemented by applying the display device 100 or 500 of the above-mentioned embodiments. The details of the implementation of the display device 620 have been described in detail in the above-mentioned embodiments and implementation methods, and therefore will not be repeated here.

[0029] It is worth mentioning that the installation position of the display device 620 on the main body 610 can be appropriately adjusted according to the installation of the head-mounted display device 600. Fig. 6 is only an example for illustration purposes, and is not intended to limit the scope of the present invention.

[0030] In summary, in the display device of the present invention, the display generates image beams with different polarization directions, and the image focus adjustment device performs an adjustment operation on the focal length of the image beams according to the polarization direction. In this way, the image length of the image formed on each part of the display screen can be effectively controlled, and the display image with multiple depths of field can be effectively generated, improving the display quality. [Industrial Applicability]

[0031] The display device of the present invention adjusts the focal length of image beams having different polarization directions, and forms images of different image beams on image planes at different image distances, thereby effectively improving the display effect presented by the display device. The display device of the present invention can be applied to a virtual image display system such as a head-mounted display device. [Explanation of symbols]

[0032] 100, 500, 620: Display device 110, 200, 510: Display 111, 112: Sub-area 120, 300, 400, 520: Image focus adjustment device 210: Display panel 220: Polarizing plate 230: Liquid crystal array substrate 231, 232: Liquid crystal Sub-area 311: First delay film 312: Beam splitter 313: Second retardation film 314: Reflective linear polarizer 320: Lens group 330: Medium 600: Head-mounted display device 610: Main part d1, d2: Image distance DIM1, DIM2: Sub-area image EYE: eyeball f: focal length IML1, IML2: Image beam M1, M2: Imaging plane P1, P2: Traveling optical path Z1, Z2: Sub-area

Claims

1. a display having a plurality of partitions each transmitting a plurality of image beams having a plurality of different polarization directions; an image focusing device disposed adjacent to the display and configured to adjust a focal length of each of the image beams based on the respective polarization directions of each of the image beams.

2. The display comprises: a display panel used to generate a display image; a polarizing plate disposed so as to overlap the display panel and used to return the polarization state of the display image; 2. The display device according to claim 1, comprising: a liquid crystal array substrate arranged adjacent to the polarizing plate, the liquid crystal partitions each corresponding to a plurality of the partitions, the liquid crystal partitions each receiving a plurality of partition images of the display image, and controlling the polarization directions of the plurality of partition images to generate the image beams, respectively.

3. 3. The display device of claim 2, wherein each of the liquid crystal partitions of the liquid crystal array receives a corresponding control voltage and rotates each of the polarization directions of each of the image beams by a predetermined angle based on the control voltage.

4. 4. The display device of claim 3, wherein when each of the liquid crystal partitions does not receive the control voltage, each of the liquid crystal partitions keeps the respective polarization direction of each of the image beams unchanged.

5. The display device of claim 1 , wherein the image focusing device adjusts a travel path of each of the image beams based on the polarization direction of each of the image beams.

6. the image focusing device is a polarization selective mirror; The polarization selective mirror is a first delay film adapted to receive a plurality of said image beams; a beam splitter disposed to overlap the first retardation film; a second retardation film disposed adjacent to the beam splitter; 2. The display device of claim 1, further comprising: a reflective linear polarizer disposed to overlap the second retardation film and used to reflect or project each of the image beams based on the polarization direction of each of the image beams.

7. 7. The display device of claim 6, further comprising a medium between the second retardation film and the beam splitter.

8. The polarization selective mirror is The display device of claim 6 , further comprising a lens group disposed adjacent to the light exit surface of the reflective linear polarizer.

9. 2. The display device of claim 1, wherein the image focusing device is a polarizing directional lens.

10. 2. The display device of claim 1, wherein a first partition of the display transmits a first image beam having a first polarization direction, a second partition of the display transmits a second image beam having a second polarization direction, the polarization selective mirror adjusts a transmission path of the first image beam based on the first polarization direction of the first image beam to control imaging of the first image beam in a first plane, and the polarization selective mirror adjusts a transmission path of the second image beam based on the second polarization direction of the second image beam to control imaging of the second image beam in a second plane, where the first plane and the second plane do not overlap each other.

11. A main body part, A head mounted display comprising: the display device according to claim 1 that is installed on the main body.

Images