CN107748439B - Display control method and head-mounted display device - Google Patents
Display control method and head-mounted display device Download PDFInfo
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- CN107748439B CN107748439B CN201710980061.2A CN201710980061A CN107748439B CN 107748439 B CN107748439 B CN 107748439B CN 201710980061 A CN201710980061 A CN 201710980061A CN 107748439 B CN107748439 B CN 107748439B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 60
- 238000004590 computer program Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
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- G—PHYSICS
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- 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
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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
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/014—Head-up displays characterised by optical features comprising information/image processing systems
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Abstract
The invention discloses a display control method and a head-mounted display device, wherein the method is applied to the head-mounted display device, the head-mounted display device comprises a display card, a display screen and a liquid crystal light valve, the liquid crystal light valve is positioned at the near-eye side of the display screen, the method comprises the steps of detecting a vertical synchronizing signal output by the display card, displaying a current frame image in a frame buffer memory of the display card on the display screen based on the vertical synchronizing signal, and sequentially controlling a multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state.
Description
Technical Field
The present invention relates to the field of image display, and in particular, to a display control method and a head-mounted display device.
Background
In the VR (Virtual Reality) technology, screen display is an important part, and VR displays a Virtual picture through a screen, and due to the limitation of a screen refresh rate, a certain delay occurs on the screen, and the experience of a user is affected by a serious screen delay. Generally, if the screen delay exceeds 20ms, the phenomenon of smearing and blurring of the screen is easily caused.
In the prior art, the problem of too high screen delay can be solved by the following two schemes.
In the first scheme, the refreshing rate of the screen is improved. Since the screen delay depends to a large extent on the refresh rate of the display screen, the higher the refresh rate, the smaller the screen delay, and when the pictures displayed on the screen are switched more continuously, the human eye will continue to receive the picture information as if it were in the real world.
For example, for a 2k (1920 × 1080) resolution display screen, the refresh rate is high, which can reach over 75Hz, and the delay is about 1000/75 to 13.3ms, while for a 4k (4096 × 2160) resolution display screen, the advantages are high resolution and good screen definition, but the refresh rate for a 4k display screen is low, which is only 60Hz, and the delay is about 1000/60 to 17.7ms, and other delays are more than 20 ms.
The second scheme reduces the display screen afterglow, and the reduction display screen afterglow has very big effect to reducing the delay, and when the user wears the head of the head-mounted equipment and rotates, if the display screen afterglow is lower, the track of the motion of the object on the display screen is closer to the real track of the physical world.
However, the reduction of afterglow relates to the screen material, and for a head-mounted device using an L CD (L acquired Crystal Display; liquid Crystal Display), since the L CD screen adopts the backlight principle, an image is generated by projecting a backlight light source onto a liquid Crystal array, and since the liquid Crystal needs response time for turning over, the L CD screen cannot achieve low afterglow.
It can be seen that none of the prior art solutions can improve the delay of the low refresh rate L CD screen well, resulting in that the L CD screen is prone to smear and blur.
Disclosure of Invention
The invention aims to provide a display control method and a head-mounted display device, which are used for solving the technical problem that the phenomenon of smear and blurring is easy to occur on a L CD screen due to the delay of L CD screens in the prior art.
In order to achieve the above object, a first aspect of embodiments of the present invention provides a display control method applied in a head-mounted display device, where the head-mounted display device includes a graphics card, a display screen, and a liquid crystal light valve, and the liquid crystal light valve is located on a near-to-eye side of the display screen, and the method includes:
detecting a vertical synchronizing signal output by the display card;
and displaying the current frame image in the frame buffer memory of the display card on the display screen based on the vertical synchronizing signal, and sequentially controlling the multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state.
Optionally, sequentially controlling the multi-grating on the liquid crystal light valve to adjust from a non-transparent state to a transparent state includes:
and sequentially controlling the multiple grids of the grating to be adjusted from the non-transparent state to the transparent state, and controlling the grating in the transparent state to keep the transparent state unchanged until the multiple grids of the grating are all in the transparent state.
Optionally, the method further includes:
and after the multi-grid grating is in a transparent state, controlling the multi-grid grating to be adjusted from the transparent state to a non-transparent state.
Optionally, sequentially controlling the multi-grating on the liquid crystal light valve to adjust from a non-transparent state to a transparent state includes:
and sequentially controlling a plurality of grids to adjust the grating from the non-transparent state to the transparent state, and controlling the grating to adjust from the transparent state to the non-transparent state when the duration of the grating in the transparent state exceeds a preset duration.
A second aspect of the embodiments of the present invention provides a head-mounted display device, including a display card, a display screen, a liquid crystal light valve and a computer-readable storage medium, where the liquid crystal light valve is located on a near-to-eye side of the display screen, the liquid crystal light valve is provided with a multi-grid grating, and a computer program stored in the computer-readable storage medium, when executed by a processor, includes the following steps:
detecting a vertical synchronizing signal output by the display card;
and displaying the current frame image in the frame buffer memory of the display card on the display screen based on the vertical synchronizing signal, and sequentially controlling the multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state.
Optionally, the step of storing in the readable storage medium: sequentially controlling the multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state, wherein the corresponding computer program comprises the following steps in the specific executed process:
sequentially controlling a plurality of grids of the grating to be adjusted from the non-transparent state to the transparent state;
and controlling the grating in the transparent state to keep the transparent state unchanged until the plurality of gratings are in the transparent state.
Optionally, the readable storage medium further stores another computer program, and the computer program when executed includes the following steps:
and after the multi-grid grating is in a transparent state, controlling the multi-grid grating to be adjusted from the transparent state to a non-transparent state.
Optionally, the step of storing in the readable storage medium: sequentially controlling the multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state, wherein the corresponding computer program comprises the following steps in the specific executed process:
sequentially controlling a plurality of grids of the grating to be adjusted from the non-transparent state to the transparent state;
and when the duration time of the grating in the transparent state exceeds a preset time length, controlling the grating to be adjusted from the transparent state to a non-transparent state.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
in the scheme of the embodiment of the invention, when the display screen displays the picture, the vertical synchronizing signal output by the display card is detected, the current frame image in the frame buffer memory of the display card is displayed on the display screen, and simultaneously the multi-grid gratings on the liquid crystal light valve are sequentially controlled to be adjusted from the non-transparent state to the transparent state, so that the light-emitting time of the display screen part corresponding to each grid grating relative to human eyes is reduced, the delay of the L CD screen with the low refresh rate is improved, and the phenomena of smear and blur of the L CD screen are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise:
fig. 1 is a schematic structural diagram of a liquid crystal light valve according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a display control method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a display control method, which is applied to a head-mounted display device, wherein the head-mounted display device comprises a display card, a display screen and a liquid crystal light valve, the liquid crystal light valve is positioned at the near-eye side of the display screen, a plurality of gratings are arranged on the liquid crystal light valve, and each grating can be independently controlled to change the light transmission state of the grating so as to change the light transmission state of the liquid crystal light valve.
Next, the structure of the liquid crystal light valve will be explained. The liquid crystal light valve is provided with a multi-grid grating, the grid number of the grating can be 20 grids, 25 grids or 36 grids, and the like, which is not limited by the invention. As shown in fig. 1, fig. 1 is a schematic structural diagram of a liquid crystal light valve according to an embodiment of the present invention, where the liquid crystal light valve sequentially includes 22 gratings from left to right, and each grating can be independently controlled.
Referring to fig. 2, fig. 2 is a schematic flow chart of a display control method according to an embodiment of the present invention, including the following steps.
And step 10, detecting the vertical synchronous signal output by the display card.
The Vertical Synchronization signal is a VSYNC (Vertical Synchronization) signal, and the video card outputs the Vertical Synchronization signal after the screen is refreshed once, and the Vertical Synchronization signal has the function of enabling the operation speed of the video card to be consistent with the screen refresh rate so as to output a stable picture. After the display card outputs the vertical synchronization signal, the head-mounted display device displays the current frame image in the frame buffer memory on the display screen, and then the display card, specifically, a GPU (graphics processing Unit) in the display card, starts rendering the next frame of image to be displayed in the frame buffer memory.
And 20, displaying the current frame image in the frame buffer memory of the display card on the display screen based on the vertical synchronizing signal, and sequentially controlling the multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state.
The Frame Buffer memory (Frame Buffer) is called Frame Buffer or video memory for short, and is a direct image of the picture displayed on the screen, the image stored in the Frame Buffer memory is one Frame by one Frame, one or more frames of images can be stored in the Frame Buffer memory at the same time, and when the head-mounted display device displays the picture, the image in the Frame Buffer memory can be refreshed continuously, so that the image displayed on the screen can be refreshed.
In the embodiment of the invention, when the current frame image in the frame buffer memory is displayed on the display screen, the multi-grid grating on the liquid crystal light valve is sequentially controlled to be adjusted from the non-transparent state to the transparent state, because the liquid crystal light valve is in the non-transparent state before the current frame image is displayed on the display screen, at the moment, the light emitted by the display screen cannot penetrate through the liquid crystal light valve to reach human eyes, and when the current frame image is displayed on the display screen, the multi-grid grating on the liquid crystal light valve is sequentially controlled to be adjusted from the non-transparent state to the transparent state, so that the light emitted by the display screen penetrates through the liquid crystal light valve to reach the human eyes, the display time of each part on the display screen relative to the human eyes is reduced, the delay of a low refresh rate L CD screen.
In a possible implementation manner, the head-mounted display device may sequentially control the multiple gratings to adjust from the non-transparent state to the transparent state, and control the gratings in the transparent state to keep the transparent state unchanged until the multiple gratings are all in the transparent state. For example, suppose that the liquid crystal light valve sequentially includes a 1 st grating, a 2 nd grating, a 3 rd grating and a 4 th grating from left to right, in an initial state, the liquid crystal light valve is in a non-transparent state, and when the liquid crystal light valve is controlled, the 1 st grating, the 2 nd grating, the 3 rd grating and the 4 th grating are sequentially controlled to be adjusted to a transparent state from the non-transparent state, and when the 2 nd grating is controlled, the 1 st grating keeps the transparent state unchanged, and when the 3 rd grating is controlled, the 1 st grating and the 2 nd grating keep the transparent state unchanged, so on, until the 4 th grating on the liquid crystal light valve is in the transparent state.
Therefore, in the scheme, the plurality of gratings are sequentially controlled to be adjusted from the non-transparent state to the transparent state, so that the light-emitting time of the display screen part corresponding to each grating relative to human eyes can be reduced, thereby reducing afterglow of the display screen, improving the delay of the L CD screen with the low refresh rate, and avoiding the phenomena of smear and blur of the L CD screen.
Further, after the gratings on the liquid crystal light valve are all in the transparent state, in order to prevent L CD screen light from continuing to enter human eyes, the head-mounted display device controls the multi-grid gratings to be adjusted from the transparent state to the non-transparent state, and until the display screen needs to display the next frame of image, the steps 10 and 20 are repeatedly executed, so that the gratings on the liquid crystal light valve are all in the non-transparent state in the period from the time when the current frame of image is displayed to the time when the next frame of image is displayed, and the light on the display screen cannot enter human eyes, thereby reducing afterglow of the display screen and improving the delay of the low refresh rate L CD screen.
In another possible implementation manner, the head-mounted display device sequentially controls a plurality of grids of the optical grating to be adjusted from the non-transparent state to the transparent state, and controls the optical grating to be adjusted from the transparent state to the non-transparent state after the duration of the optical grating in the transparent state exceeds a preset time. For example, assuming that the liquid crystal light valve sequentially includes a 1 st grating, a 2 nd grating, a 3 rd grating and a 4 th grating from left to right, in an initial state, the liquid crystal light valve is in a non-transparent state, when the liquid crystal light valve is controlled, the 1 st grating, the 2 nd grating, the 3 rd grating and the 4 th grating are sequentially controlled to be adjusted from the non-transparent state to a transparent state, and after the 1 st grating is controlled to be adjusted from the non-transparent state to the transparent state, and when the duration of the 1 st grating in the transparent state exceeds a preset duration, the 1 st grating is controlled to be adjusted from the transparent state to the non-transparent state, and likewise, after the 2 nd grating is controlled to be adjusted from the non-transparent state to the transparent state, and when the duration of the 2 nd grating in the transparent state exceeds the preset duration, the 2 nd grating is controlled to be adjusted from the transparent state to the non-transparent state, the control is performed by the same method for the 3 rd grating and the 4 th grating. The preset duration may be set according to an empirical value, which is not limited in the present invention.
Therefore, in the scheme, the plurality of gratings are sequentially controlled to be adjusted from the non-transparent state to the transparent state, so that the light emitting time of the display screen part corresponding to each grating relative to human eyes can be reduced, the afterglow of the display screen is reduced, the delay of the L CD screen with the low refresh rate is improved, and the light emitting time of each part of the display screen relative to the human eyes is more uniform and the display effect is improved because the time length of each grating in the transparent state is preset.
It should be noted that although the light-emitting time of each part on the display screen is reduced relative to the human eye, due to the persistence of vision of the human eye, once the light emitted by the display screen forms a visual image on the retina of the human eye, the visual image does not disappear immediately after the action of the light is finished, but the feeling of the visual image is maintained for a period of time, so that the user can still see a continuous and clear visual image even if the light-emitting time of the display screen relative to the human eye is reduced.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, magnetic tape, magnetic disk, optical disk, magneto-optical disk, ROM, PROM, VCD, DVD, etc.) having computer-usable program code embodied therein.
Based on the same inventive concept, an embodiment of the present invention further provides a head-mounted display device, including a display card, a display screen, a liquid crystal light valve and a computer-readable storage medium, where the liquid crystal light valve is located on a near-to-eye side of the display screen, and a multi-grid grating is disposed on the liquid crystal light valve, and when executed by a processor, a computer program stored in the computer-readable storage medium includes the following steps:
detecting a vertical synchronizing signal output by the display card;
and displaying the current frame image in the frame buffer memory of the display card on the display screen based on the vertical synchronizing signal, and sequentially controlling the multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state.
Optionally, the step of storing in the readable storage medium: sequentially controlling the multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state, wherein the corresponding computer program comprises the following steps in the specific executed process:
sequentially controlling a plurality of grids of the grating to be adjusted from the non-transparent state to the transparent state;
and controlling the grating in the transparent state to keep the transparent state unchanged until the plurality of gratings are in the transparent state.
Optionally, the readable storage medium further stores another computer program, and the computer program when executed includes the following steps:
and after the multi-grid grating is in a transparent state, controlling the multi-grid grating to be adjusted from the transparent state to a non-transparent state.
Optionally, the step of storing in the readable storage medium: sequentially controlling the multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state, wherein the corresponding computer program comprises the following steps in the specific executed process:
sequentially controlling a plurality of grids of the grating to be adjusted from the non-transparent state to the transparent state;
and when the duration time of the grating in the transparent state exceeds a preset time length, controlling the grating to be adjusted from the transparent state to a non-transparent state.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
in the scheme of the embodiment of the invention, when the display screen displays the picture, the vertical synchronizing signal output by the display card is detected, the current frame image in the frame buffer memory of the display card is displayed on the display screen, and simultaneously the multi-grid gratings on the liquid crystal light valve are sequentially controlled to be adjusted from the non-transparent state to the transparent state, so that the light-emitting time of the display screen part corresponding to each grid grating relative to human eyes is reduced, the delay of the L CD screen with the low refresh rate is improved, and the phenomena of smear and blur of the L CD screen are avoided.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (8)
1. A display control method is applied to a head-mounted display device, and is characterized in that the head-mounted display device comprises a display card, a display screen and a liquid crystal light valve, wherein the liquid crystal light valve is positioned on the near-to-eye side of the display screen, and the method comprises the following steps:
detecting a vertical synchronizing signal output by the display card;
and displaying the current frame image in the frame buffer memory of the display card on the display screen based on the vertical synchronizing signal, and sequentially controlling the multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state.
2. The method of claim 1, wherein sequentially controlling the adjustment of the multi-cell grating on the liquid crystal light valve from a non-transparent state to a transparent state comprises:
and sequentially controlling the multiple grids of the grating to be adjusted from the non-transparent state to the transparent state, and controlling the grating in the transparent state to keep the transparent state unchanged until the multiple grids of the grating are all in the transparent state.
3. The method of claim 2, wherein the method further comprises:
and after the multi-grid grating is in a transparent state, controlling the multi-grid grating to be adjusted from the transparent state to a non-transparent state.
4. The method of claim 1, wherein sequentially controlling the adjustment of the multi-cell grating on the liquid crystal light valve from a non-transparent state to a transparent state comprises:
and sequentially controlling a plurality of grids to adjust the grating from the non-transparent state to the transparent state, and controlling the grating to adjust from the transparent state to the non-transparent state when the duration of the grating in the transparent state exceeds a preset duration.
5. A head-mounted display device, comprising a graphics card, a display screen, a liquid crystal light valve and a computer-readable storage medium, wherein the liquid crystal light valve is located on a near-to-eye side of the display screen, and a multi-grid optical grating is disposed on the liquid crystal light valve, and when being executed by a processor, a computer program stored in the computer-readable storage medium comprises the following steps:
detecting a vertical synchronizing signal output by the display card;
and displaying the current frame image in the frame buffer memory of the display card on the display screen based on the vertical synchronizing signal, and sequentially controlling the multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state.
6. The head-mounted display device of claim 5, wherein the readable storage medium has stored therein the steps of: sequentially controlling the multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state, wherein the corresponding computer program comprises the following steps in the specific executed process:
sequentially controlling a plurality of grids of the grating to be adjusted from the non-transparent state to the transparent state;
and controlling the grating in the transparent state to keep the transparent state unchanged until the plurality of gratings are in the transparent state.
7. A head-mounted display device as recited in claim 6, wherein the readable storage medium has stored therein further computer programs that, when executed, include the steps of:
and after the multi-grid grating is in a transparent state, controlling the multi-grid grating to be adjusted from the transparent state to a non-transparent state.
8. The head-mounted display device of claim 5, wherein the readable storage medium has stored therein the steps of: sequentially controlling the multi-grid grating on the liquid crystal light valve to be adjusted from a non-transparent state to a transparent state, wherein the corresponding computer program comprises the following steps in the specific executed process:
sequentially controlling a plurality of grids of the grating to be adjusted from the non-transparent state to the transparent state;
and when the duration time of the grating in the transparent state exceeds a preset time length, controlling the grating to be adjusted from the transparent state to a non-transparent state.
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