CN108399896B - Display device and driving method thereof - Google Patents
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- CN108399896B CN108399896B CN201810186423.5A CN201810186423A CN108399896B CN 108399896 B CN108399896 B CN 108399896B CN 201810186423 A CN201810186423 A CN 201810186423A CN 108399896 B CN108399896 B CN 108399896B
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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
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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
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Abstract
The application provides a display device and a driving method thereof, wherein the display device comprises a backlight module and a display module, and the display module comprises a display panel and a light adjusting module which are arranged in a stacked mode; the backlight module is used for providing backlight for the display module; the light adjusting module is used for adjusting the transmittance of incident light to be lower than a preset value within a preset time period of each frame of picture; the light adjusting module is used for modulating the incident light, so that the incident light in the preset time period of each frame of picture can not enter human eyes, namely, the picture is displayed in full black in the preset time period, black insertion processing is realized, visual residues are eliminated, and the trailing phenomenon is improved.
Description
Technical Field
The present invention relates to the field of display panel technologies, and in particular, to a display device and a driving method thereof.
Background
In recent years, the use of Virtual Reality (VR) has become more widespread. In the VR display, a display device is used to display left and right images with parallax, and the left and right eyes of an observer receive corresponding pictures respectively, and then the images are synthesized by the brain, so that the radial depth of an object is virtualized, and an immersive 3D experience is realized. However, VR display requires a display to have a fast response capability, otherwise, a smearing phenomenon occurs, so that an observed 3D image has a phenomenon of "ghost" and the like, which affects the experience effect of people.
The tailing phenomenon is caused by various factors such as a special imaging mechanism of human eyes and long response time of a display panel, the response speed of the display panel is improved in a smaller and smaller space at present, and a thorough solution for the problem of display tailing is not found by the technical personnel in the field.
Disclosure of Invention
The invention provides a display device and a driving method thereof, which are used for solving the problem of picture tailing in the prior art.
In order to solve the above problems, the present invention discloses a display device including: the display module comprises a display panel and a light adjusting module which are arranged in a stacked mode;
the backlight module is used for providing backlight for the display module;
the light adjusting module is used for adjusting the transmittance of incident light to be lower than a preset value in a preset time period of each frame of picture.
Preferably, the light adjusting module is disposed between the backlight module and the display panel; or, the display panel is arranged between the backlight module and the light adjusting module.
Preferably, the light modulation module is a blue phase liquid crystal cell;
the blue phase liquid crystal box is used for adjusting the transmittance of incident light to be lower than a preset value through the deflection of blue phase liquid crystal in the blue phase liquid crystal box in a preset time period of each frame of picture.
Preferably, the blue phase liquid crystal cell includes: the liquid crystal display panel comprises a first substrate, a second substrate, a first polaroid, a second polaroid, an electrode structure and blue phase liquid crystal filled between the first substrate and the second substrate, wherein the first substrate and the second substrate are arranged oppositely;
the electrode structure is arranged between the first substrate and the second substrate and used for generating an electric field to deflect the blue-phase liquid crystal;
the first substrate is arranged close to the display panel;
the first polarizer is arranged on the surface, far away from the blue-phase liquid crystal, of the first substrate, and the polarization axis direction of the first polarizer is the same as that of a third polarizer, close to the first substrate, on the display panel;
the second polarizer is arranged on the surface, far away from the blue-phase liquid crystal, of the second substrate, and the polarizing axis direction of the second polarizer is perpendicular to the polarizing axis direction of the first polarizer.
Preferably, the first polarizer and the third polarizer are synthesized into a common polarizer of the blue phase liquid crystal cell and the display panel.
Preferably, the electrode structure comprises: a first electrode in the form of a stripe and a second electrode in the form of a stripe;
the first electrodes and the second electrodes are alternately arranged on the surface, close to the blue phase liquid crystal, of the first substrate or the second substrate, and a space is reserved between the adjacent first electrodes and the adjacent second electrodes.
In order to solve the above problem, the present invention also discloses a driving method of a display device, applied to the display device as described in any one of the above, the driving method comprising:
providing backlight to the display module through the backlight module;
and adjusting the transmittance of incident light to be lower than a preset value within a preset time period of each frame of picture through the light adjusting module.
Preferably, a ratio of the preset time period of each frame to the time period of each frame is greater than or equal to 70% and less than 100%.
Preferably, the ratio of the preset time period of each frame of picture to the time period of each frame of picture is 90%.
Preferably, when the optical switch module is a blue phase liquid crystal cell, the step of adjusting the transmittance of incident light to be lower than a preset value within a preset time period of each frame of picture by the light adjusting module includes:
and in a preset time period of each frame of picture, the transmittance of incident light is adjusted to be lower than a preset value through the deflection of blue phase liquid crystal in the blue phase liquid crystal box.
Compared with the prior art, the invention has the following advantages:
the application provides a display device and a driving method thereof, wherein the display device comprises a backlight module and a display module, and the display module comprises a display panel and a light adjusting module which are arranged in a stacked mode; the backlight module is used for providing backlight for the display module; the light adjusting module is used for adjusting the transmittance of incident light to be lower than a preset value within a preset time period of each frame of picture; the light adjusting module is used for modulating the incident light, so that the incident light in the preset time period of each frame of picture can not enter human eyes, namely, the picture is displayed in full black in the preset time period, black insertion processing is realized, visual residues are eliminated, and the trailing phenomenon is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention 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 that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a light modulation process in a display device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another display device according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a light modulation process in another display device according to an embodiment of the invention;
FIG. 5 is a schematic view illustrating a structure of a blue phase liquid crystal cell according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram illustrating an electrode structure in a blue phase liquid crystal cell according to an embodiment of the present invention;
FIG. 7 is a flowchart illustrating steps of a display driving method according to an embodiment of the invention;
description of reference numerals:
11-a backlight module; 12-a display module; 13-a display panel; 14-a light adjusting module; 51-a first substrate; 52-a second substrate; 53-a first polarizer; 54-a second polarizer; 55-blue phase liquid crystal; 61-a first electrode; 62 second electrode.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
In an embodiment of the present application, referring to fig. 1, there is provided a display device, which may include: the display module 12 may include a display panel 13 and a light adjusting module 14, which are stacked; a backlight module 11 for providing backlight to the display module 12; the light adjusting module 14 is configured to adjust the transmittance of the incident light to be lower than a preset value within a preset time period of each frame of picture.
In one implementation of the present embodiment, referring to fig. 1, the light adjusting module 14 is disposed between the backlight module 11 and the display panel 13. During each frame, the backlight module 11 is turned on all the time, and supplies backlight to the light adjusting module 14. In a preset time period of each frame of the picture, for example, the preset time period may be 90% of the time period of each frame of the picture, the transmittance of the incident light is adjusted by the light adjusting module 14 to be lower than the preset value, that is, the incident light is changed into the pulsed light with the duty ratio of 10% after passing through the light adjusting module 14. And then, gray scale display is realized through the display panel 13, that is, the pixels display full black within 90% of the time period of each frame, and finally, the image display time received by human eyes only accounts for 10% of each frame, so that black insertion processing is realized. For example, the frame time is 5ms, and after the black insertion processing is performed by the light adjusting module 14, the image display time received by human eyes is changed to 0.5ms, so that the visual residual is completely eliminated, and the trailing phenomenon is eliminated. The preset value is set based on the condition that the viewer cannot perceive the preset value, and can be determined according to factors such as the transmittance of the display panel and the photosensitive threshold of the viewer in practical application. The specific modulation process of the light in this implementation may refer to fig. 2, and fig. 2 shows a light modulation process of a three-frame picture.
In another implementation manner of the present embodiment, referring to fig. 3, the display panel 13 is disposed between the backlight module 11 and the light modulation module 14. During each frame of picture, the backlight module 11 is always turned on to provide backlight to the display panel 13, and the light passes through the display panel 13 to realize different gray scale display, and the picture at this time still has a trailing phenomenon. The light passing through the display panel 13 passes through the light adjusting module 14, and in a 90% preset time period of each frame of picture, the transmittance of the incident light is adjusted to be lower than a preset value by the light adjusting module 14, that is, the incident light passes through the light adjusting module 14 and then becomes pulsed light with a duty ratio of 10%, that is, the image display time received by the human eyes finally only accounts for 10% of each frame of picture, so that the visual residual is completely eliminated, the black insertion processing is realized, and the trailing phenomenon is eliminated. The preset value is set based on the condition that the viewer cannot perceive the preset value, and can be determined according to factors such as a photosensitive threshold value of the viewer in practical application. The specific modulation process of the light in this implementation may refer to fig. 4, where fig. 4 illustrates a light modulation process of a three-frame picture.
Specifically, the backlight module 11 may be any backlight module capable of providing backlight.
The light adjusting module 14 may be a blue phase liquid crystal cell, and may also be an ocb (optically compensated birefringence) liquid crystal cell, but is not limited to these two types, and any device capable of adjusting the transmittance of incident light to be lower than a preset value within a preset time period of each frame is within the scope of the present application.
The embodiment provides a display device, modulates incident light through a light adjusting module, so that the incident light in each frame of picture preset time period can not enter human eyes, namely, the picture displays full black in the preset time period, black insertion processing is realized, visual residues are eliminated, and the trailing phenomenon is improved.
Specifically, the light adjusting module 14 in the above embodiment may be a blue phase liquid crystal cell, and the blue phase liquid crystal cell is configured to adjust the transmittance of the incident light to be lower than a preset value through the deflection of the blue phase liquid crystal in the blue phase liquid crystal cell in a preset time period of each frame of the picture. The response time of the blue phase liquid crystal is in the sub-millisecond order, so that the incident light can be modulated in real time through the rapid deflection of the blue phase liquid crystal, the control of the picture display time is realized, and the black insertion processing is carried out on the display image.
Specifically, referring to fig. 5, the blue phase liquid crystal cell may include: the liquid crystal display panel comprises a first substrate 51, a second substrate 52, a first polarizer 53, a second polarizer 54, an electrode structure and blue phase liquid crystal 55 filled between the first substrate 51 and the second substrate 52 which are oppositely arranged. An electrode structure may be disposed between the first substrate 51 and the second substrate 52 for generating an electric field to deflect the blue phase liquid crystal 55; the first substrate 51 may be disposed adjacent to the display panel 13; the first polarizer 53 may be disposed on a surface of the first substrate 51 away from the blue phase liquid crystal 55, and a polarization axis direction of the first polarizer 53 is the same as a polarization axis direction of a third polarizer on the display panel 13 close to the first substrate 51; the second polarizer 54 may be disposed on a surface of the second substrate 52 away from the blue phase liquid crystal 55, and a polarizing axis direction of the second polarizer 54 is perpendicular to a polarizing axis direction of the first polarizer 53.
It should be noted that the polarization axis direction of the first polarizer 53 and the polarization axis direction of the third polarizer may be any other angle than perpendicular. In order to improve the utilization rate of light, the first polarizer 53 and the third polarizer preferably have the same polarization axis direction, and the efficiency of light emitted from the display panel 13 entering the blue phase liquid crystal cell or light emitted from the blue phase liquid crystal cell entering the display panel 13 is the highest. In order to reduce the cost, the first polarizer 53 and the third polarizer may be the same polarizer, that is, the same polarizer is shared by the first substrate 51 and the surface of the display panel 13 adjacent to the blue phase liquid crystal cell.
Specifically, referring to fig. 6, the electrode structure may include a first electrode 61 having a bar shape and a second electrode 62 having a bar shape; the first electrodes 61 and the second electrodes 62 are alternately arranged on the surface of the first substrate 51 or the second substrate 52 near the blue phase liquid crystal 55 with a space between the adjacent first electrodes 61 and second electrodes 62. The first electrodes 61 and the second electrodes 62 alternately arranged form a transverse electric field inside the blue phase liquid crystal cell, and the blue phase liquid crystal 55 is deflected by the electric field. By adjusting the magnitude of the electric field, the deflection angle of the blue phase liquid crystal is controlled, and the modulation of the incident light transmittance is realized under the combined action of the first polarizer 53 and the second polarizer 54.
In practical applications, the electrode structure may also adopt other structures, for example, the first electrode 61 and the second electrode 62 may also be respectively disposed on the inner surfaces of the two opposite substrates. The present application is not limited to the above-mentioned electrode structure, and any electrode structure capable of generating an electric field for deflecting the blue phase liquid crystal 55 is within the scope of the present application.
The blue phase liquid crystal box in the embodiment can be driven in a whole plane without distinguishing the pixel structure, so that the manufacturing process is simple, and the design and the process are easy to realize.
At present, in order to improve the tailing phenomenon of the display device, it is common practice to perform black insertion processing on the backlight unit BLU, for example, 10% of the time of one frame of picture is in a lit state, and the remaining 90% of the time is in a dark state, and by this method, the tailing phenomenon of the picture caused by the long response time of the display panel itself can be improved. However, in order to display a higher color gamut, the RG powder LED BLU is usually used to match the display panel, but due to the inherent characteristics of the RG powder LED, the black insertion process cannot be performed, and the phenomenon of the trailing of the screen still occurs. The scheme of carrying out light modulation through the light modulation module, such as a blue phase liquid crystal box, is suitable for all backlight modules, and can carry out black insertion treatment on a display picture, so that the trailing problem in the prior art can be thoroughly solved.
In another embodiment of the present application, referring to fig. 7, there is further provided a driving method of a display device, which is applied to the display device according to any one of the above embodiments, and the driving method may include:
step 701: and providing backlight to the display module through the backlight module.
Step 702: and adjusting the transmittance of the incident light to be lower than a preset value within a preset time period of each frame of picture through a light adjusting module.
Wherein, the ratio of the preset time period of each frame of picture to the time period of each frame of picture is greater than or equal to 70% and less than 100%. That is, the ratio of the time period for which the human eyes receive the display pictures to the time period of each frame of the pictures is greater than 0% and less than or equal to 30%.
In order to obtain the best picture display effect, the ratio of the preset time period of each frame of picture to the time period of each frame of picture is 90%. That is, the ratio of the time period in which the human eye receives the display picture to the time period of the picture per frame is 10%.
For a specific light modulation process, reference may be made to the description of the above embodiments, which are not described herein again.
When the optical switch module is a blue phase liquid crystal cell, the step 702 may further include:
and in the preset time period of each frame of picture, the transmittance of incident light is adjusted to be lower than a preset value through the deflection of blue phase liquid crystal in the blue phase liquid crystal box.
The deflection of the blue phase liquid crystal in the blue phase liquid crystal box can be adjusted through an electric field generated by an electrode structure in the blue phase liquid crystal box.
The application provides a display device and a driving method thereof, wherein the display device comprises a backlight module and a display module, and the display module comprises a display panel and a light adjusting module which are arranged in a stacked mode; the backlight module is used for providing backlight for the display module; the light adjusting module is used for adjusting the transmittance of incident light to be lower than a preset value within a preset time period of each frame of picture; the light adjusting module is used for modulating the incident light, so that the incident light in the preset time period of each frame of picture can not enter human eyes, namely, the picture is displayed in full black in the preset time period, black insertion processing is realized, visual residues are eliminated, and the trailing phenomenon is improved.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The display device and the driving method thereof provided by the present invention are described in detail above, and the principle and the embodiment of the present invention are explained in detail herein by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A display device, comprising: the display module comprises a display panel and a light adjusting module which are arranged in a stacked mode;
the backlight module is used for providing backlight for the display module, and the backlight module is always turned on during each frame of picture;
the light adjusting module is used for adjusting the transmittance of incident light to be lower than a preset value within a preset time period of each frame of picture, and performing black insertion processing on a display image; the preset value is determined by the light sensing threshold of the viewer.
2. The display device according to claim 1,
the light adjusting module is arranged between the backlight module and the display panel; or,
the display panel is arranged between the backlight module and the light adjusting module.
3. The display device according to claim 1 or 2, wherein the light modulation module is a blue phase liquid crystal cell;
the blue phase liquid crystal box is used for adjusting the transmittance of incident light to be lower than a preset value through the deflection of blue phase liquid crystal in the blue phase liquid crystal box in a preset time period of each frame of picture.
4. The display device according to claim 3, wherein the blue phase liquid crystal cell comprises: the liquid crystal display panel comprises a first substrate, a second substrate, a first polaroid, a second polaroid, an electrode structure and blue phase liquid crystal filled between the first substrate and the second substrate, wherein the first substrate and the second substrate are arranged oppositely;
the electrode structure is arranged between the first substrate and the second substrate and used for generating an electric field to deflect the blue-phase liquid crystal;
the first substrate is arranged close to the display panel;
the first polarizer is arranged on the surface, far away from the blue-phase liquid crystal, of the first substrate, and the polarization axis direction of the first polarizer is the same as that of a third polarizer, close to the first substrate, on the display panel;
the second polarizer is arranged on the surface, far away from the blue-phase liquid crystal, of the second substrate, and the polarizing axis direction of the second polarizer is perpendicular to the polarizing axis direction of the first polarizer.
5. The display device according to claim 4, wherein the first polarizer and the third polarizer are synthesized as a common polarizer for the blue phase liquid crystal cell and the display panel.
6. The display device according to claim 4, wherein the electrode structure comprises: a first electrode in the form of a stripe and a second electrode in the form of a stripe;
the first electrodes and the second electrodes are alternately arranged on the surface, close to the blue phase liquid crystal, of the first substrate or the second substrate, and a space is reserved between the adjacent first electrodes and the adjacent second electrodes.
7. A driving method of a display device applied to the display device according to any one of claims 1 to 6, the driving method comprising:
providing backlight to the display module through the backlight module, wherein the backlight module is always turned on during each frame of picture;
adjusting the transmittance of incident light to be lower than a preset value within a preset time period of each frame of picture through the light adjusting module, and performing black insertion processing on a display image; the preset value is determined by the light sensing threshold of the viewer.
8. The driving method as claimed in claim 7, wherein a ratio of the preset time period of each frame to the time period of each frame is greater than or equal to 70% and less than 100%.
9. The driving method as claimed in claim 7, wherein a ratio of the preset time period of each frame to the time period of each frame is 90%.
10. The driving method according to any one of claims 7 to 9, wherein when the light adjusting module is a blue phase liquid crystal cell, the step of adjusting, by the light adjusting module, the transmittance of the incident light to be lower than a preset value in a preset time period of each frame of a picture comprises:
and in a preset time period of each frame of picture, the transmittance of incident light is adjusted to be lower than a preset value through the deflection of blue phase liquid crystal in the blue phase liquid crystal box.
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| TW200834199A (en) * | 2007-01-29 | 2008-08-16 | Boe Hydis Technology Co Ltd | Fringe field switching mode liquid crystal display and manufacturing method thereof |
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