CN109407392B - Liquid crystal display and virtual reality head-mounted device - Google Patents
Liquid crystal display and virtual reality head-mounted device Download PDFInfo
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- CN109407392B CN109407392B CN201910001828.1A CN201910001828A CN109407392B CN 109407392 B CN109407392 B CN 109407392B CN 201910001828 A CN201910001828 A CN 201910001828A CN 109407392 B CN109407392 B CN 109407392B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a liquid crystal display screen and virtual reality head-mounted equipment, and belongs to the technical field of virtual reality. The liquid crystal display screen comprises a first display area and a second display area, and when the liquid crystal display screen displays a target image with barrel distortion, the target image is positioned in the first display area and positioned outside the second display area; and in the second display area, the backlight source of the liquid crystal display screen is an infrared light source. According to the technical scheme provided by the embodiment of the invention, the virtual reality head-mounted equipment can track the point of regard of the user without independently arranging a special mechanical structure for bearing an infrared light source, so that the volume of the virtual reality head-mounted equipment can be reduced.
Description
Technical Field
The invention relates to the technical field of virtual reality, in particular to a liquid crystal display screen and virtual reality head-mounted equipment.
Background
For Virtual Reality (VR) technology, presenting images with higher resolution can greatly improve the presence of a user, but this also puts higher requirements on rendering and transmission of images. To reduce the pressure of image rendering and transmission, more and more VR headsets introduce a gaze point rendering function in which a user's gaze point can be tracked to determine the center of a field of view in an image, and during the process of rendering the image, a higher resolution can be provided for an image area in the center of the field of view, and a lower resolution can be provided for other image areas. In the process of tracking the gaze point of the user, infrared light can be used for illuminating the eyeball area of the user, the position of the pupil in the illuminated eyeball area is captured through the camera, and then the gaze point of the user is determined according to the position of the pupil.
In the related art, in order to track the gaze point of the user, a special mechanical structure for carrying the infrared light source may be provided in the VR headset, for example, the mechanical structure may be a ring structure.
Separately providing mechanical structures in the VR headset to carry the infrared light source increases the volume of the VR headset.
Disclosure of Invention
The embodiment of the invention provides a liquid crystal display screen and virtual reality head-mounted equipment. The technical scheme is as follows:
in a first aspect, a liquid crystal display is provided, where the liquid crystal display includes a first display area and a second display area, and when the liquid crystal display displays a target image with barrel distortion, the target image is located in the first display area and located outside the second display area;
and in the second display area, the backlight source of the liquid crystal display screen is an infrared light source.
Optionally, in the second display area, the sub-pixel filters in the liquid crystal display are all infrared filters, and the wavelength of light allowed to pass through by the infrared filters is consistent with the wavelength of infrared light emitted by the infrared light source.
Optionally, in the first display region, the liquid crystal display screen is provided with a sub-pixel filter;
and in the second display area, the liquid crystal display screen is not provided with a sub-pixel optical filter.
Optionally, in the second display area, the light intensity of the infrared light emitted from the liquid crystal display screen can be periodically switched between the first light intensity and the second light intensity.
Optionally, in the second display region, the liquid crystal display screen is provided with a target liquid crystal layer, and the posture of liquid crystal in the target liquid crystal layer can be periodically switched between the first posture and the second posture under the driving of the driving component of the liquid crystal display screen.
Optionally, the intensity of the infrared light emitted by the infrared light source can be periodically switched between a third intensity and a fourth intensity.
Optionally, in the first display area, the liquid crystal display screen is provided with a liquid crystal layer;
in the second display area, the liquid crystal display screen is not provided with a liquid crystal layer.
Optionally, in the first display area, the liquid crystal display screen is provided with an upper polarizer and a lower polarizer;
and in the second display area, the liquid crystal display screen is not provided with an upper polarizer and a lower polarizer.
In a second aspect, a virtual reality head-mounted device is provided, where the virtual reality head-mounted device includes a liquid crystal display screen and a camera module as described in any one of the first aspects above;
the camera shooting assembly is used for shooting an eyeball area of the user illuminated by target infrared light to obtain a pupil image of the user, and the target infrared light is infrared light emitted by the liquid crystal display screen in a second display area.
Optionally, the virtual reality headset further includes a lens, and the size of the second display region is determined according to an optical characteristic of the lens.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
by providing a liquid crystal display panel including a first display region and a second display region, wherein the backlight source of the second display region is an infrared light source, when the liquid crystal display panel displays a target image with barrel distortion, the target image is located in the first display region, and is located outside the second display region, since the liquid crystal display panel provided in the VR headset generally needs to display the target image with barrel distortion, when the target image is displayed, a part of the display region of the liquid crystal display panel, that is, the second display region, is an invalid display region which is not used for displaying the target image, in other words, when the liquid crystal display panel displays the target image, the second display region is located outside the target image, and therefore, setting the backlight source of the second display region as an infrared light source does not affect the display of the target image on the one hand, on the other hand can utilize the infrared light of this infrared light source transmission to shine user's eyeball to the realization is to the tracking of user's point of regard, and like this, VR head-mounted device need not set up special mechanical structure who is used for bearing infrared light source alone, also can realize the tracking to user's point of regard, consequently, can reduce VR head-mounted device's volume.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a liquid crystal display panel according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a convex lens imaging provided by an embodiment of the invention.
Fig. 3 is a schematic diagram of another convex lens imaging provided by the embodiment of the invention.
Fig. 4 is a schematic diagram of displaying an image with barrel distortion according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In practical applications, in order to ensure the presence of a user on the premise of reducing image rendering and transmission pressure, a Virtual Reality (VR) head-mounted device may generally provide a gaze point rendering function.
In the gaze point rendering function, the VR headset may provide a higher resolution only for an image region in the center of the field of view and a lower resolution for other image regions when rendering an image. Wherein the center of the field of view refers to the area around the user's gaze point.
To determine the center of the field of view, the VR headset may track the user's gaze point. In the related art, the VR headset may be provided with a special mechanical structure for carrying an infrared light source, and irradiate an eyeball area of a user with an infrared light source carried on the mechanical structure to determine a pupil position of the user, and then determine a gaze point of the user according to the pupil position of the user.
However, separately providing mechanical structures to carry the infrared light source in the VR headset increases the volume of the VR headset.
The embodiment of the invention provides a liquid crystal display screen and virtual reality head-mounted equipment, which can reduce the volume of VR head-mounted equipment on the premise of realizing a fixation point rendering function.
In the following, a brief description will be given of a structure of a liquid crystal display provided in an embodiment of the present invention, which may be a display screen in a VR headset. As shown in fig. 1, a liquid crystal display panel 10 according to an embodiment of the present invention may include a first display region 101 and a second display region 102.
When the liquid crystal display panel 10 displays an object image having barrel distortion, the object image is located in the first display region 101 and outside the second display region 102, wherein the backlight of the liquid crystal display panel 10 is an infrared light source in the second display region 102.
To provide a wider field of view for a user and improve the user's sense of presence, VR headsets typically have a convex lens between the display screen and the eyes of the person.
However, the image on the display screen passing through the convex lens generally has a certain distortion, and the distortion is generally pincushion distortion.
Referring to fig. 2, as shown in fig. 2, the normal image a displayed on the display screen is imaged by the convex lens T as an image b with pincushion distortion.
To ensure the display effect of the image, the VR headset generally needs to perform distortion correction. One of the more common distortion correction methods is: barrel distortion is added to the image to be displayed to compensate for pincushion distortion caused by the convex lens. In other words, the VR headset may add barrel distortion to the image that needs to be displayed to obtain a target image with barrel distortion, which is then displayed in the display screen.
Referring to fig. 3, as shown in fig. 3, the target image c with barrel distortion displayed on the display screen is imaged as a normal image a after passing through the convex lens T.
When a target image having barrel distortion is displayed, a part of a display area in a display screen is an invalid display area, which is an area where the target image is not displayed, and is usually located at four corners of the display screen.
Referring to fig. 4, when the display screen displays the target image R having barrel distortion as shown in fig. 4, A, B, C and D in the display screen are invalid display areas.
The liquid crystal display screen 10 provided by the embodiment of the present invention may include a first display area 101 and a second display area 102, wherein when the liquid crystal display screen 10 displays a target image with barrel distortion, the second display area 102 is an invalid display area.
In the liquid crystal display panel 10 provided in the embodiment of the invention, the backlight source of the second display area 102 may be an infrared light source. The backlight source 102 of the second display area is set as an infrared light source, which does not affect the display of the target image with barrel distortion by the liquid crystal display screen 10, and on the other hand, the infrared light emitted by the infrared light source can illuminate the eyeball area of the user, thereby realizing the tracking of the user's gaze point. Therefore, the VR headset does not need to be provided with a special mechanical structure for bearing an infrared light source independently, tracking of a user's gaze point can be achieved, and therefore the size of the VR headset can be reduced.
In summary, the embodiments of the present invention provide a liquid crystal display panel including a first display region and a second display region, wherein a backlight source of the second display region is an infrared light source, when the liquid crystal display panel displays a target image with barrel distortion, the target image is located in the first display region, and is located outside the second display region, since the liquid crystal display panel disposed in the VR headset generally needs to display the target image with barrel distortion, when the target image is displayed, a part of the display region of the liquid crystal display panel, that is, the second display region, is an invalid display region which is not used for displaying the target image, in other words, when the liquid crystal display panel displays the target image, the second display region is located outside the target image, therefore, setting the backlight source of the second display region as an infrared light source does not affect the display of the target image on the one hand, on the other hand can utilize the infrared light of this infrared light source transmission to shine user's eyeball to the realization is to the tracking of user's point of regard, and like this, VR head-mounted device need not set up special mechanical structure who is used for bearing infrared light source alone, also can realize the tracking to user's point of regard, consequently, can reduce VR head-mounted device's volume.
In an alternative embodiment, in the second display region 102, the sub-pixel filters in the liquid crystal display 10 are all infrared filters, wherein the wavelengths of light allowed to pass through the infrared filters are the same as the wavelengths of the backlight (i.e., the infrared light sources) disposed in the second display region 102 of the liquid crystal display 10.
In general, for each pixel, the lcd panel may be provided with 3 sub-pixel filters, which are a red filter, a green filter and a blue filter, and the white light emitted from the backlight source may form red light, green light and blue light after passing through the 3 sub-pixel filters.
In the liquid crystal display 10 provided in the embodiment of the present invention, in the second display area 102, the sub-pixel filters arranged in the second display area may be all infrared filters, and the wavelength of light allowed to pass through by the infrared filters is consistent with the wavelength of a backlight (that is, an infrared light source) arranged in the second display area 102 by the liquid crystal display 10, so that it can be ensured that infrared light emitted by the infrared light source can be emitted from the infrared filters.
Of course, in an alternative embodiment, the lcd panel 10 may not have a sub-pixel filter in the second display region 102 to ensure the normal emission of the infrared light from the infrared light source.
In order to ensure that the liquid crystal display panel 10 can normally display the target image in the first display region 101, the liquid crystal display panel 10 may be provided with sub-pixel filters in the first display region 101, and for each pixel, the liquid crystal display panel 10 may be provided with 3 sub-pixel filters, which are a red filter, a green filter and a blue filter.
In an alternative embodiment, the intensity of the infrared light emitted from the liquid crystal display panel 10 in the second display region 102 can be periodically switched between the first intensity and the second intensity.
In practical application, infrared light irradiated on an eyeball area of a user can form a light spot in the eyeball area of the user, and in the process of determining the pupil position, the VR head-mounted device can easily misjudge the light spot as the pupil of the user, so that the pupil position of the user is determined wrongly, and then the fixation point rendering function of the VR head-mounted device is negatively affected.
In order to improve the accuracy of determining the pupil position of the user, the light intensity of the infrared light emitted from the liquid crystal display 10 in the second display area 102 provided by the embodiment of the invention can be periodically switched between a first light intensity and a second light intensity, wherein the difference between the first light intensity and the second light intensity can be greater than a target difference, and the target difference can be set by a technician. Therefore, infrared light irradiating the eyeball area of the user forms a light spot in the eyeball area of the user to generate flicker, so that the VR head-mounted equipment can identify the light spot easily, the probability that the VR head-mounted equipment judges the light spot as the pupil of the user by mistake can be reduced, and the accuracy of determining the pupil position of the user can be improved.
In one possible implementation manner, the liquid crystal display panel 10 provided by the embodiment of the invention may be provided with a target liquid crystal layer in the second display region 102, and the posture of liquid crystal in the target liquid crystal layer can be periodically switched between the first posture and the second posture under the driving of the driving component of the liquid crystal display panel 10.
Thus, under the condition that the light intensity of the infrared light emitted by the infrared light source is not changed, when the liquid crystal in the target liquid crystal layer is in the first posture, the light intensity of the infrared light emitted by the liquid crystal display screen 10 in the second display area 102 may be the first light intensity, and when the liquid crystal in the target liquid crystal layer is in the second posture, the light intensity of the infrared light emitted by the liquid crystal display screen 10 in the second display area 102 may be the second light intensity.
In another possible implementation, the intensity of the infrared light emitted by the infrared light source can be periodically switched between the third intensity and the fourth intensity.
Thus, when the light intensity of the infrared light emitted by the infrared light source is the third light intensity, the light intensity of the infrared light emitted by the liquid crystal display screen 10 in the second display area 102 may be the first light intensity, and when the light intensity of the infrared light emitted by the infrared light source is the fourth light intensity, the light intensity of the infrared light emitted by the liquid crystal display screen 10 in the second display area 102 may be the second light intensity.
It is noted that the third light intensity may be equal to the first light intensity and the fourth light intensity may be equal to the second light intensity.
It should be noted that in this implementation, the liquid crystal display panel 10 may not be provided with a liquid crystal layer in the second display region 102, and furthermore, the liquid crystal display panel 10 may not be provided with an upper polarizer and a lower polarizer.
Of course, in order to ensure that the liquid crystal display panel 10 can normally display the target image, the liquid crystal display panel 10 may be provided with a liquid crystal layer, an upper polarizer, and a lower polarizer in the first display region 101.
In summary, the embodiments of the present invention provide a liquid crystal display panel including a first display region and a second display region, wherein a backlight source of the second display region is an infrared light source, when the liquid crystal display panel displays a target image with barrel distortion, the target image is located in the first display region, and is located outside the second display region, since the liquid crystal display panel disposed in the VR headset generally needs to display the target image with barrel distortion, when the target image is displayed, a part of the display region of the liquid crystal display panel, that is, the second display region, is an invalid display region which is not used for displaying the target image, in other words, when the liquid crystal display panel displays the target image, the second display region is located outside the target image, therefore, setting the backlight source of the second display region as an infrared light source does not affect the display of the target image on the one hand, on the other hand can utilize the infrared light of this infrared light source transmission to shine user's eyeball to the realization is to the tracking of user's point of regard, and like this, VR head-mounted device need not set up special mechanical structure who is used for bearing infrared light source alone, also can realize the tracking to user's point of regard, consequently, can reduce VR head-mounted device's volume.
The embodiment of the invention also provides VR head equipment, which can comprise a camera assembly and the liquid crystal display screen in the embodiment.
The camera shooting assembly is used for shooting an eyeball area of the user illuminated by target infrared light to obtain a pupil image of the user, and the target infrared light is infrared light emitted outwards by the liquid crystal display screen in the second display area.
In one embodiment of the invention, the VR headset further includes a lens, wherein the second display area is sized according to an optical characteristic of the lens.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The liquid crystal display screen is characterized by comprising a first display area and a second display area, wherein when the liquid crystal display screen displays a target image with barrel distortion, the target image is positioned in the first display area and positioned outside the second display area;
the second display area is an invalid display area, the invalid display area is an area where the target image is not displayed, and the second display area is located at four corners of the display screen;
in the second display area, the backlight source of the liquid crystal display screen is an infrared light source, the sub-pixel optical filters in the liquid crystal display screen are all infrared optical filters, and the wavelength of light allowed to pass through by the infrared optical filters is consistent with the wavelength of infrared light emitted by the infrared light source.
2. The liquid crystal display panel according to claim 1, wherein in the first display region, the liquid crystal display panel is provided with a sub-pixel filter;
and in the second display area, the liquid crystal display screen is not provided with a sub-pixel optical filter.
3. The lcd panel of claim 1, wherein the intensity of the infrared light emitted from the lcd panel in the second display region is periodically switched between a first intensity and a second intensity.
4. The liquid crystal display panel according to claim 3, wherein in the second display region, the liquid crystal display panel is provided with a target liquid crystal layer, and the posture of liquid crystal in the target liquid crystal layer is periodically switchable between a first posture and a second posture under the driving of a driving component of the liquid crystal display panel.
5. The liquid crystal display of claim 3, wherein the intensity of the infrared light emitted by the infrared light source is periodically switchable between a third intensity and a fourth intensity.
6. The liquid crystal display panel according to claim 5, wherein in the first display region, the liquid crystal display panel is provided with a liquid crystal layer;
in the second display area, the liquid crystal display screen is not provided with a liquid crystal layer.
7. The liquid crystal display panel according to claim 6, wherein in the first display region, the liquid crystal display panel is provided with an upper polarizer and a lower polarizer;
and in the second display area, the liquid crystal display screen is not provided with an upper polarizer and a lower polarizer.
8. A virtual reality headset comprising a liquid crystal display as claimed in any one of claims 1 to 7 and a camera assembly;
the camera shooting assembly is used for shooting an eyeball area of the user illuminated by target infrared light to obtain a pupil image of the user, and the target infrared light is infrared light emitted by the liquid crystal display screen in a second display area.
9. The virtual reality headset of claim 8, further comprising a lens, wherein the second display region is sized according to an optical characteristic of the lens.
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| CN109709678B (en) * | 2019-03-08 | 2021-05-14 | 京东方科技集团股份有限公司 | Display device and method for manufacturing the same |
| CN110347305A (en) * | 2019-05-30 | 2019-10-18 | 华为技术有限公司 | A kind of VR multi-display method and electronic equipment |
| CN110211543B (en) * | 2019-07-10 | 2020-10-30 | 京东方科技集团股份有限公司 | Local backlight adjusting method and device and virtual reality system |
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| CN108470548A (en) * | 2018-05-17 | 2018-08-31 | 京东方科技集团股份有限公司 | A kind of liquid crystal display device and its control method, head-mounted display apparatus, medium |
| CN109031762A (en) * | 2018-08-23 | 2018-12-18 | 合肥京东方光电科技有限公司 | Display panel and its driving method, display device |
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