CN108735168B - Backlight module, 3D display device and driving method thereof - Google Patents
Backlight module, 3D display device and driving method thereof Download PDFInfo
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- CN108735168B CN108735168B CN201810516605.4A CN201810516605A CN108735168B CN 108735168 B CN108735168 B CN 108735168B CN 201810516605 A CN201810516605 A CN 201810516605A CN 108735168 B CN108735168 B CN 108735168B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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Abstract
The invention discloses a backlight module, a 3D display device and a driving method thereof.A backlight module comprises a backlight source and a control part, wherein the backlight source is provided with a plurality of light-emitting areas which correspond to sub-pixels of a liquid crystal display screen one by one; the control section may control the light emission direction of each light emitting region of the backlight. Namely, the backlight module can provide a directional light source for each sub-pixel, so that the left eye and the right eye respectively see two images corresponding to the stereo pair in a time division mode, and the images are comprehensively processed by the brain, so that multi-view naked eye 3D image display without loss of resolution is realized.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module, a 3D display device and a driving method thereof.
Background
Currently, attention has been paid to a Three-Dimensional (3D) display technology, which can make a picture become Three-Dimensional and vivid, and the most basic principle is to use left and right human eyes to receive different pictures respectively, and to superimpose and reproduce the received image information through a brain to form an image with a Three-Dimensional directional effect.
At present, the 3D display technology includes two major types, namely a naked eye type and a glasses type. The naked eye type is that special processing is performed on a display panel, and 3D video images subjected to coding processing are independently sent to the left eye and the right eye of a person, so that a user can experience stereoscopic sensation by naked eyes without the help of stereoscopic glasses.
At present, a Barrier such as a Barrier (Barrier) or a liquid crystal lens is arranged in front of a light source array of a Liquid Crystal Display (LCD) to realize naked-eye 3D display, and a plurality of viewing zones are formed in front of a display panel by using the Barrier or the liquid crystal lens, so that light emitted by different sub-pixels on the display panel falls into different viewing fields, and two eyes of a viewer fall into the different viewing fields to generate 3D feeling.
However, the current 3D display device can only realize 3D effect at a certain viewing angle, and if 3D effect is required to be realized at a plurality of viewing angles, the resolution is seriously lost. For example, a viewer may see a three-dimensional image at 8 positions, then each position will be assigned 1/8 sub-pixels, and thus the resolution will be lost 7/8, and thus the more viewpoints can be viewed, the more severe the resolution loss.
Disclosure of Invention
In view of this, embodiments of the present invention provide a backlight module, a 3D display device and a driving method thereof, so as to solve the problem of resolution loss of the existing naked-eye 3D display device.
According to the backlight module provided by the embodiment of the invention, the backlight module is used for providing a light source for the liquid crystal display screen; the backlight module comprises a backlight source and a control part;
the backlight source is provided with a plurality of light emitting areas which correspond to the sub-pixels of the liquid crystal display screen one by one;
the control portion is configured to control a light emission direction of each of the light emitting regions of the backlight.
Optionally, in the backlight module provided in the embodiment of the present invention, each light-emitting area of the backlight source is provided with an independent sub-light source;
the control unit is configured to control the light emission direction of each of the light emitting regions by adjusting the angle of each of the sub light sources.
Optionally, in the backlight module provided in the embodiment of the present invention, the backlight source includes a side-in type backlight assembly, and a plurality of reflectors located on a side of the side-in type backlight assembly away from the liquid crystal display panel and corresponding to the light emitting areas one to one;
the control unit is configured to control a light emission direction of each of the light emitting regions by adjusting a reflection surface of each of the mirrors.
Optionally, in the backlight module provided in the embodiment of the present invention, the side-in backlight assembly includes a light guide plate and an LED light source located on a side surface of the light guide plate;
and each reflector is positioned on one side of the light guide plate, which is far away from the liquid crystal display screen.
Optionally, in the backlight module provided in the embodiment of the present invention, the control portion includes a plurality of micro-electromechanical control units corresponding to the light emitting areas one to one;
the micro-electro-mechanical control unit is used for controlling the light emitting direction of the corresponding light emitting region.
Correspondingly, the embodiment of the invention also provides a 3D display device which comprises a liquid crystal display screen and any one of the backlight modules provided by the embodiment of the invention.
Optionally, in the 3D display device provided in the embodiment of the present invention, a human eye tracking module is further included;
the human eye tracking module is used for tracking the position of human eyes when the liquid crystal display screen displays the human eyes;
the control part in the backlight module is specifically used for controlling the light emitting direction of each light emitting area of the backlight source according to the human eye position determined by the human eye tracking module.
Optionally, in the 3D display device provided in the embodiment of the present invention, the control portion specifically includes a plurality of micro-electromechanical control units and driving units, which are in one-to-one correspondence with the light emitting areas;
the driving unit is used for driving each micro-electromechanical control unit according to the human eye position determined by the human eye tracking module;
the micro-electromechanical control unit is specifically configured to control the light emitting direction of each light emitting region under the driving of the driving unit.
Optionally, in the 3D display device provided in the embodiment of the present invention, the human eye tracking module includes at least one camera;
the camera is embedded in the display side of the liquid crystal display screen.
Based on the same inventive concept, an embodiment of the present invention further provides a driving method of the 3D display device, including:
in a display period, the liquid crystal display screen alternately displays a left eye image and a right eye image;
the human eye tracking module tracks the position of the left eye of the human eye when the liquid crystal display screen displays the left eye image; the control part controls the light emitting direction of each light emitting area of the backlight source to point to the left eye position according to the left eye position determined by the human eye tracking module;
the eye tracking module tracks the position of the right eye of the human eye when the liquid crystal display screen displays the right eye image; the control part controls the light emitting direction of each light emitting area of the backlight source to point to the right eye position according to the right eye position determined by the human eye tracking module.
The invention has the following beneficial effects:
according to the backlight module, the 3D display device and the driving method thereof provided by the embodiment of the invention, the adopted backlight module comprises a backlight source and a control part, wherein the backlight source is provided with a plurality of light emitting areas which are in one-to-one correspondence with the sub-pixels of the liquid crystal display screen; the control section may control the light emission direction of each light emitting region of the backlight. Namely, the backlight module can provide a directional light source for each sub-pixel, so that the left eye and the right eye respectively see two images corresponding to the stereo pair in a time division mode, and the images are comprehensively processed by the brain, so that multi-view naked eye 3D image display without loss of resolution is realized.
Drawings
Fig. 1 is a schematic structural diagram of a 3D display device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a 3D display device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a 3D display device according to an embodiment of the present invention;
fig. 4 is a flowchart of a driving method of a 3D display device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a backlight module according to an embodiment of the invention;
fig. 6 is a second schematic structural diagram of a backlight module according to an embodiment of the invention.
Detailed Description
The embodiment of the invention provides a backlight module, a 3D display device and a driving method thereof. In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, 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 shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
The 3D display device provided by the embodiment of the present invention, as shown in fig. 1, includes a liquid crystal display screen 01 and a backlight module 02 for providing a light source for the liquid crystal display screen 01; the backlight module 02 includes a backlight 021 and a control part 022;
the backlight 021 has a plurality of light emitting regions 0211 corresponding to the sub-pixels 011 of the liquid crystal display panel 01 one by one;
the control portion 022 controls the light emission direction of each light emitting region 0211 of the backlight 021.
According to the 3D display device provided by the embodiment of the invention, the adopted backlight module comprises a backlight source and a control part, wherein the backlight source is provided with a plurality of light emitting areas which are in one-to-one correspondence with the sub-pixels of the liquid crystal display screen; the control section may control the light emission direction of each light emitting region of the backlight. Namely, the backlight module can provide a directional light source for each sub-pixel, so that the left eye and the right eye respectively see two images corresponding to the stereo pair in a time division mode, and the images are comprehensively processed by the brain, so that multi-view naked eye 3D image display without loss of resolution is realized.
Optionally, in the 3D display device provided in the embodiment of the present invention, a human eye tracking module is further included;
the human eye tracking module is used for tracking the position of human eyes when the liquid crystal display screen displays the human eyes;
the control part in the backlight module is specifically used for controlling the light emitting direction of each light emitting area of the backlight source according to the human eye position determined by the human eye tracking module.
Specifically, in the 3D display device provided in the embodiment of the present invention, the liquid crystal display screen displays two stereo pair images (left eye image and right eye image) in an interlaced manner in a time division multiplexing manner, that is, the liquid crystal display screen displays the left eye image and the right eye image alternately; the human eye tracking module tracks the position of the left eye of the human eye when the liquid crystal display screen displays the left eye image; the control part controls the light emitting direction of each light emitting area of the backlight source to point to the left eye position according to the left eye position determined by the human eye tracking module; the human eye tracking module tracks the right eye position of human eyes when the liquid crystal display screen displays the right eye image; the control part controls the light emitting direction of each light emitting area of the backlight source to point to the right eye position according to the right eye position determined by the human eye tracking module. Therefore, the left eye and the right eye respectively see two images corresponding to the stereo pair in a time division mode, and the images are comprehensively processed by the brain to realize multi-view naked eye 3D image display. Since all sub-pixels are seen by the left and right eye at any one time, there is no loss of resolution.
In specific implementation, the 3D display device provided in the embodiment of the present invention can also implement 2D display. When 2D display is realized, in the backlight module, the control part can control light of each light-emitting area of the backlight source to be emitted in a direction vertical to the screen of the liquid crystal display screen. Therefore, the 3D display device can realize switching between 2D display and 3D display.
Optionally, in the 3D display device provided in the embodiment of the present invention, as shown in fig. 2, each light emitting region 0211 of the backlight 021 is provided with an independent sub-light source 0210; the control part 022 controls the light emission direction of each light emitting region by adjusting the angle of each sub-light source 0210.
In a specific implementation, in the 3D display device provided in the embodiment of the present invention, the sub-light source may use a micro LED, which is not limited herein.
Optionally, in the 3D display device provided in the embodiment of the present invention, as shown in fig. 3, the backlight 021 includes an edge-type backlight assembly 03, and a plurality of reflectors 04 located on a side of the edge-type backlight assembly 03 away from the liquid crystal display and corresponding to the light emitting regions 0211 one to one; the control unit 022 controls the light emission direction of each light emitting region 0211 by adjusting the reflection surface of each mirror 04. That is, the light emission direction of each light emitting region is adjusted by the reflecting mirror 04.
Optionally, in the 3D display device provided in the embodiment of the present invention, as shown in fig. 3, the side-in type backlight assembly 03 includes a light guide plate 031 and LED light sources 032 located at a side surface of the light guide plate; each reflector 04 is located on a side of the light guide plate 031 facing away from the liquid crystal display panel.
In an implementation, the edge-type backlight assembly may further include other optical film layers, such as a light diffusion layer, and the like, which is not limited herein.
Alternatively, in the 3D display device provided in the embodiment of the present invention, as shown in fig. 2 and 3, the control part 022 includes a plurality of micro electro mechanical control units 0221 in one-to-one correspondence with the respective light emitting regions 0211; the micro electro mechanical control unit 0221 is used to control the light exit direction of the corresponding light emitting region 0211. The Micro-Electro-Mechanical System (MEMS) is generally driven by an electrostatic motor, and has the advantages of simple structure, low power consumption, high response frequency, and the like.
Optionally, in the 3D display device provided in the embodiment of the present invention, the control part 022 further includes a driving unit 0222;
the driving unit 0222 is used for driving each micro electro mechanical control unit 0221 according to the human eye position determined by the human eye tracking module;
the micro electro mechanical control unit 0221 is specifically configured to control the light emission direction of each light emitting region 0211 under the drive of the drive unit 0222.
Optionally, in the 3D display device provided in the embodiment of the present invention, the human eye tracking module includes at least one camera; the camera is embedded in the display side of the liquid crystal display. Of course, the camera may be fixed on the display side of the liquid crystal display screen by other means, such as a bracket, which is not limited herein.
Based on the same inventive concept, an embodiment of the present invention further provides a driving method for driving the 3D display device, as shown in fig. 4, including:
s401, alternately displaying a left eye image and a right eye image by a liquid crystal display screen;
s402, tracking the left eye position of the human eye by the human eye tracking module when the left eye image is displayed on the liquid crystal display screen; the control part controls the light emitting direction of each light emitting area of the backlight source to point to the left eye position according to the left eye position determined by the human eye tracking module;
s403, when the liquid crystal display screen displays the right eye image, the human eye tracking module tracks the right eye position of human eyes; the control part controls the light emitting direction of each light emitting area of the backlight source to point to the right eye position according to the right eye position determined by the human eye tracking module.
In the driving method provided by the embodiment of the invention, the liquid crystal display screen adopts a time division multiplexing mode to alternately display two stereo pair images (a left eye image and a right eye image), namely the liquid crystal display screen alternately displays the left eye image and the right eye image; the human eye tracking module tracks the position of the left eye of the human eye when the liquid crystal display screen displays the left eye image; the control part controls the light emitting direction of each light emitting area of the backlight source to point to the left eye position according to the left eye position determined by the human eye tracking module; the human eye tracking module tracks the right eye position of human eyes when the liquid crystal display screen displays the right eye image; the control part controls the light emitting direction of each light emitting area of the backlight source to point to the right eye position according to the right eye position determined by the human eye tracking module. Therefore, the left eye and the right eye respectively see two images corresponding to the stereo pair in a time division mode, and the images are comprehensively processed by the brain, so that multi-view naked eye 3D image display without loss of resolution is realized.
In a specific implementation, in one display period, the liquid crystal display may display the left eye image first and then display the right eye image, or may display the right eye image first and then display the left eye image, which is not limited herein.
Based on the same inventive concept, the embodiment of the present invention further provides a backlight module, as shown in fig. 5 and 6, including a backlight 021 and a control portion 022;
the backlight 021 has a plurality of light emitting regions 0211 corresponding to the sub-pixels 011 of the liquid crystal display panel 01 one by one;
the control portion 022 controls the light emission direction of each light emitting region 0211 of the backlight 021.
The backlight module provided by the embodiment of the invention comprises a backlight source and a control part, wherein the backlight source is provided with a plurality of light emitting areas which correspond to the sub-pixels of the liquid crystal display screen one by one; the control section may control the light emission direction of each light emitting region of the backlight. The backlight module with the directional light source is provided, so that the directional light source aiming at each sub-pixel can be provided, and the loss of resolution ratio can be avoided in application and a 3D display device.
Optionally, in the backlight module provided in the embodiment of the present invention, as shown in fig. 5, each light emitting region 0211 of the backlight 021 is provided with an independent sub-light source 0210; the control part 022 controls the light emission direction of each light emitting region by adjusting the angle of each sub-light source 0210.
In a specific implementation, in the backlight module provided in the embodiment of the present invention, the sub-light source may adopt a micro LED, which is not limited herein.
Optionally, in the backlight module provided in the embodiment of the present invention, as shown in fig. 6, the backlight 021 includes an edge-type backlight assembly 03, and a plurality of reflectors 04 located on a side of the edge-type backlight assembly 03 away from the liquid crystal display and corresponding to the light emitting regions 0211 one to one; the control unit 022 controls the light emission direction of each light emitting region 0211 by adjusting the reflection surface of each mirror 04. That is, the light emission direction of each light emitting region is adjusted by the reflecting mirror 04.
Optionally, in the backlight module provided in the embodiment of the present invention, as shown in fig. 6, the side-in type backlight assembly 03 includes a light guide plate 031 and an LED light source 032 located on a side surface of the light guide plate; each reflector 04 is located on a side of the light guide plate 031 facing away from the liquid crystal display panel.
In an implementation, the edge-type backlight assembly may further include other optical film layers, such as a light diffusion layer, and the like, which is not limited herein.
Alternatively, in the backlight module provided in the embodiment of the present invention, as shown in fig. 5 and 6, the control part 022 includes a plurality of micro electro mechanical control units 0221 in one-to-one correspondence with the light emitting regions 0211; the micro electro mechanical control unit 0221 is used to control the light exit direction of the corresponding light emitting region 0211. The Micro-Electro-Mechanical System (MEMS) is generally driven by an electrostatic motor, and has the advantages of simple structure, low power consumption, high response frequency, and the like.
According to the backlight module, the 3D display device and the driving method thereof provided by the embodiment of the invention, the adopted backlight module comprises the backlight source and the control part, wherein the backlight source is provided with a plurality of light emitting areas which are in one-to-one correspondence with the sub-pixels of the liquid crystal display screen; the control section may control the light emission direction of each light emitting region of the backlight. Namely, the backlight module can provide a directional light source for each sub-pixel, so that the left eye and the right eye respectively see two images corresponding to the stereo pair in a time division mode, and the images are comprehensively processed by the brain, so that multi-view naked eye 3D image display without loss of resolution is realized.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A backlight module is used for providing a light source for a liquid crystal display screen; the backlight module is characterized by comprising a backlight source and a control part;
the backlight source is provided with a plurality of light emitting areas which correspond to the sub-pixels of the liquid crystal display screen one by one;
the control part is used for controlling the light emitting direction of each light emitting area of the backlight source;
each light-emitting area of the backlight source is provided with an independent sub-light source;
the control part is used for controlling the light emitting direction of each light emitting region by adjusting the angle of each sub light source;
or the backlight source comprises a lateral backlight assembly and a plurality of reflectors which are positioned on one side of the lateral backlight assembly, which is deviated from the liquid crystal display screen, and are in one-to-one correspondence with the light emitting areas;
the control part is used for controlling the light emitting direction of each light emitting region by adjusting the reflecting surface of each reflector;
the left eye and the right eye respectively see two images corresponding to the stereo pair through a time division mode, and multi-view naked eye 3D image display without loss of resolution is achieved.
2. The backlight module according to claim 1, wherein the edge-type backlight assembly comprises a light guide plate and LED light sources disposed at sides of the light guide plate;
and each reflector is positioned on one side of the light guide plate, which is far away from the liquid crystal display screen.
3. The backlight module according to any one of claims 1-2, wherein the control portion comprises a plurality of micro-electromechanical control units in one-to-one correspondence with the light emitting regions;
the micro-electro-mechanical control unit is used for controlling the light emitting direction of the corresponding light emitting region.
4. A 3D display device comprising a liquid crystal display and a backlight module according to any one of claims 1-3.
5. The 3D display device of claim 4, further comprising an eye tracking module;
the human eye tracking module is used for tracking the position of human eyes when the liquid crystal display screen displays the human eyes;
the control part in the backlight module is specifically used for controlling the light emitting direction of each light emitting area of the backlight source according to the human eye position determined by the human eye tracking module.
6. The 3D display device according to claim 5, wherein the control part specifically comprises a plurality of micro-electromechanical control units and driving units in one-to-one correspondence with the light emitting regions;
the driving unit is used for driving each micro-electromechanical control unit according to the human eye position determined by the human eye tracking module;
the micro-electromechanical control unit is specifically configured to control the light emitting direction of each light emitting region under the driving of the driving unit.
7. The 3D display device of claim 6, wherein the eye tracking module comprises at least one camera;
the camera is embedded in the display side of the liquid crystal display screen.
8. A method of driving a 3D display device according to any of claims 5 to 7, comprising:
in a display period, the liquid crystal display screen alternately displays a left eye image and a right eye image;
the human eye tracking module tracks the position of the left eye of the human eye when the liquid crystal display screen displays the left eye image; the control part controls the light emitting direction of each light emitting area of the backlight source to point to the left eye position according to the left eye position determined by the human eye tracking module;
the eye tracking module tracks the position of the right eye of the human eye when the liquid crystal display screen displays the right eye image; the control part controls the light emitting direction of each light emitting area of the backlight source to point to the right eye position according to the right eye position determined by the human eye tracking module.
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| CN109523958B (en) * | 2018-12-27 | 2020-12-18 | 厦门天马微电子有限公司 | Backlight module, scanning driving method of backlight module and display device |
| CN110264962B (en) * | 2019-05-29 | 2020-11-17 | 中山大学 | Intelligent dimming system and method for pointing backlight naked eye 3D display system |
| CN111158161B (en) * | 2019-12-26 | 2021-09-21 | 西安电子科技大学 | Integrated imaging light field information acquisition and display method |
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| CN104121520A (en) * | 2013-04-29 | 2014-10-29 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN106448568A (en) * | 2015-08-10 | 2017-02-22 | 株式会社日本显示器 | Display device |
| CN105609058A (en) * | 2016-01-04 | 2016-05-25 | 京东方科技集团股份有限公司 | Backlight source and display apparatus |
| CN106959519A (en) * | 2016-01-08 | 2017-07-18 | 京东方科技集团股份有限公司 | A kind of 2D/3D switching display devices |
| CN106959520A (en) * | 2016-01-08 | 2017-07-18 | 京东方科技集团股份有限公司 | Backlight module, display device and its driving method |
| CN106249492A (en) * | 2016-10-12 | 2016-12-21 | 京东方科技集团股份有限公司 | Display device and method of work thereof |
| CN107331355A (en) * | 2017-08-31 | 2017-11-07 | 京东方科技集团股份有限公司 | A kind of backlight module, its control method and display device |
| CN107978281A (en) * | 2017-12-12 | 2018-05-01 | 北京京东方光电科技有限公司 | A kind of backlight module driving method, device and display device |
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|---|---|
| CN108735168A (en) | 2018-11-02 |
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