CN114035339A - Backlight module, display module, driving method and display device - Google Patents

Backlight module, display module, driving method and display device Download PDF

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Publication number
CN114035339A
CN114035339A CN202111443593.5A CN202111443593A CN114035339A CN 114035339 A CN114035339 A CN 114035339A CN 202111443593 A CN202111443593 A CN 202111443593A CN 114035339 A CN114035339 A CN 114035339A
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view
frame
backlight
image
mode
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Inventor
齐勇乐
马青
韩锐
崔栋
张志鹏
冷寿阳
迟卫宁
朱媛媛
王丰平
李文洋
翟跃
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BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
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BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
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Priority to CN202111443593.5A priority Critical patent/CN114035339A/en
Publication of CN114035339A publication Critical patent/CN114035339A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
    • G02B30/33—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving directional light or back-light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

Disclosed herein is a backlight module including: a dynamic light emitting unit array and a dynamic slit grating; the dynamic light emitting unit array comprises a plurality of light emitting units arranged in an array; the dynamic light-emitting unit array is configured to determine a view corresponding to each frame of image according to a display mode and provide a light-emitting unit with backlight for the image frame corresponding to the view; the dynamic slit grating is configured to determine a view corresponding to each frame of image according to a display mode, determine parameters of the dynamic slit grating according to the view, and shield a light emitting surface of the light emitting unit by using a barrier of the dynamic slit grating, so that light emitted by the light emitting unit becomes backlight pointing to a target direction corresponding to the view after passing through the dynamic slit grating; wherein the display mode includes at least one of: single view mode, dual view mode, and multi-view mode. Directional backlighting in one or more directions in multiple display modes is enabled herein.

Description

Backlight module, display module, driving method and display device
Technical Field
The present disclosure relates to, but not limited to, the field of display technologies, and in particular, to a backlight module, a display module, a driving method, and a display device.
Background
The double-view display technology can adopt a grating to display two images simultaneously displayed by the display to different directions in front of the display respectively.
Some stereoscopic displays respectively illuminate odd-even pixel arrays of a display panel or cover corresponding odd-even pixel arrays through gratings to realize that odd-even pixel arrays and even-even pixel arrays are respectively seen at left and right different angles, thereby realizing double-view display.
However, since the odd-even pixel columns of the display panel simultaneously display different screens, the image resolution in the double-view display is half of that in the normal display image.
Disclosure of Invention
In a first aspect, an embodiment of the present disclosure provides a backlight module, including: a dynamic light emitting unit array and a dynamic slit grating; the dynamic light emitting unit array comprises a plurality of light emitting units arranged in an array;
the dynamic light-emitting unit array is configured to determine a view corresponding to each frame of image according to a display mode and provide a light-emitting unit with backlight for the image frame corresponding to the view;
the dynamic slit grating is configured to determine a view corresponding to each frame of image according to a display mode, determine parameters of the dynamic slit grating according to the view, and shield a light emitting surface of the light emitting unit by using a barrier of the dynamic slit grating, so that light emitted by the light emitting unit becomes backlight pointing to a target direction corresponding to the view after passing through the dynamic slit grating;
wherein the display mode includes at least one of: single view mode, dual view mode, and multi-view mode.
In a second aspect, an embodiment of the present disclosure provides a display module, including: the backlight module comprises a backlight source module and a liquid crystal display panel;
the backlight source module is configured to determine a view corresponding to each frame of image according to a display mode and provide backlight corresponding to the view to the image frame;
the liquid crystal display panel is configured to determine a view corresponding to each frame of image according to a display mode and provide an image frame matched with the view;
wherein the display mode includes at least one of: single view mode, dual view mode, and multi-view mode.
In a third aspect, an embodiment of the present disclosure provides a driving method for a display module, including:
determining a view corresponding to each frame of image according to a display mode, determining parameters of the dynamic slit grating according to the view and providing backlight for the image frame corresponding to the view;
the dynamic slit grating shields the light emitting surface of the light emitting unit by using a barrier of the dynamic slit grating, so that the light emitted by the light emitting unit becomes backlight pointing to a target direction corresponding to a view after passing through the dynamic slit grating, and the liquid crystal display panel provides an image frame matched with the view;
wherein the display mode includes at least one of: single view mode, dual view mode, and multi-view mode.
In a fourth aspect, an embodiment of the present disclosure provides a display device, including the above display module.
The backlight module provided by the embodiment of the disclosure provides single-directional backlight in a single-view mode, and provides multi-directional backlight in a dual-view mode or a multi-view mode, so that directional backlight in one or more directions in multiple display modes can be realized.
Drawings
The accompanying drawings are included to provide an understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the disclosure;
fig. 2 is a schematic structural diagram of another backlight module provided in the embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a display module according to an embodiment of the disclosure;
fig. 4 is a flowchart of a driving method of a display module according to an embodiment of the disclosure;
FIG. 5-1 is a schematic diagram of a single view mode provided by an embodiment of the present disclosure;
FIG. 5-2 is a schematic diagram of a dual view mode provided by an embodiment of the present disclosure;
5-3 are schematic diagrams of a multi-view mode provided by embodiments of the present disclosure;
fig. 6 is a schematic light-emitting diagram of a lambertian light source provided in an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a dynamic slit grating for transmitting light emitted from a Lambertian light source according to an embodiment of the present disclosure;
FIG. 8 is a schematic single-view directional display provided by embodiments of the present disclosure;
FIG. 9 is a schematic illustration of a dual view directional display provided by an embodiment of the present disclosure;
FIG. 10 is a schematic diagram of driving signals for dual-view directional display according to an embodiment of the present disclosure;
fig. 11 is a schematic diagram of a four-view directional display provided by an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that the embodiments may be implemented in a plurality of different forms. Those skilled in the art can readily appreciate the fact that the forms and details may be varied into a variety of forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited to the contents described in the following embodiments. The embodiments and features of the embodiments in the present disclosure may be arbitrarily combined with each other without conflict.
The ordinal numbers such as "first", "second", "third", and the like in the present specification are provided for avoiding confusion among the constituent elements, and are not limited in number.
In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and limited. For example, it may be a fixed connection, or a removable connection, or an integral connection; can be a mechanical connection, or an electrical connection; either directly or indirectly through intervening components, or both may be interconnected. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.
As shown in fig. 1, an embodiment of the present disclosure provides a backlight module, including: a dynamic light emitting cell array 10 and a dynamic slit grating 20; the dynamic light emitting unit array comprises a plurality of light emitting units arranged in an array;
the dynamic light-emitting unit array is configured to determine a view corresponding to each frame of image according to a display mode and provide a light-emitting unit with backlight for the image frame corresponding to the view;
the dynamic slit grating is configured to determine a view corresponding to each frame of image according to a display mode, determine parameters of the dynamic slit grating according to the view, and shield a light emitting surface of the light emitting unit by using a barrier of the dynamic slit grating, so that light emitted by the light emitting unit becomes backlight pointing to a target direction corresponding to the view after passing through the dynamic slit grating;
wherein the display mode includes at least one of: single view mode, dual view mode, and multi-view mode.
The backlight module provided in the above embodiment includes a dynamic light emitting unit array and a dynamic slit grating, where the dynamic light emitting unit array includes a plurality of light emitting units arranged in an array, and the dynamic light emitting unit array is configured to determine a view corresponding to each frame of image according to a display mode, and provide a backlight light emitting unit for the image frame corresponding to the view; the dynamic slit grating is configured to determine a view corresponding to each frame of image according to a display mode, determine parameters of the dynamic slit grating according to the view, and shield a light emitting surface of the light emitting unit by using a barrier of the dynamic slit grating, so that light emitted by the light emitting unit becomes backlight pointing to a target direction corresponding to the view after penetrating through the dynamic slit grating. The backlight source module provides backlight with single direction in a single-view mode and backlight with multiple directions in a double-view mode or a multi-view mode, so that directional backlight in one or multiple directions in multiple display modes can be realized.
The single view mode includes a single view. The dual view mode includes a left view and a right view, and may be used for stereoscopic display (3D display). The multi-view mode includes multiple views, such as a four-view mode typically includes: left view, right view, front view and rear view.
In some exemplary embodiments, the parameters of the dynamic slit grating include at least one of: slit width, slit length, barrier width, and barrier length.
In some exemplary embodiments, the light emitting unit includes: light emitting diodes LED, Mini-LED or Micro-LED. From a literal sense, the Mini-LED may be understood as a smaller light emitting diode, also called "submillimeter light emitting diode", and the Micro-LED as a "micrometer light emitting diode".
In some exemplary embodiments, the dynamic slit grating includes: and (3) liquid crystal slit grating.
In some exemplary embodiments, the dynamic slit grating is configured to determine the parameters of the dynamic slit grating in the following manner: adjusting the light-transmitting area and the light-proof area of the liquid crystal slit grating by controlling the positions of the power-up area and the non-power-up area of the liquid crystal slit grating; the light-transmitting area corresponds to the slit of the liquid crystal slit grating, and the light-proof area corresponds to the barrier of the liquid crystal slit grating.
In some exemplary embodiments, as shown in fig. 2, the backlight module further includes: a light absorbing film 30; the light absorption film is arranged on one side, far away from the dynamic slit grating, of the dynamic light emitting unit array and used for absorbing light incident to the light absorption film, and therefore reflected light incident to the dynamic slit grating is reduced.
In some exemplary embodiments, one frame image corresponds to one view in any one display mode. Since one frame image corresponds to one view, the resolution of each frame image is not degraded.
In some exemplary embodiments, when the display mode is a single-view mode, each frame image corresponds to the same view, and the backlight direction of each frame image is the same; when the display mode is a dual-view mode, the left view corresponds to an image of an odd frame, the right view corresponds to an image of an even frame, and the backlight direction of the odd frame is different from the backlight direction of the even frame; when the display mode is a K view mode, the K views respectively correspond to K frame images, and the backlight directions of the K frame images are different; k is greater than or equal to 4.
In some exemplary embodiments, the light emitting units providing backlight for the image frames corresponding to different kinds of views are different or partially the same in any one display mode. For example, in the dual view mode, the light emitting units for providing backlight for the odd frames corresponding to the left view are different from or partially the same as the light emitting units for providing backlight for the even frames corresponding to the right view. In the multi-view mode, the light emitting units for different views may be completely different, or partially the same. Under the dual-view mode/multi-view mode, the whole frames of different views are alternately/alternately displayed, and the directional backlight is combined, so that the display of any view angle can be realized, and the resolution of a display picture cannot be reduced.
In some exemplary embodiments, the dynamic lighting unit array is configured to determine the lighting units providing backlight for the image frames corresponding to the views in the following manner: and when the display mode is the single-view mode, setting all the light-emitting units as light-emitting units for providing backlight for any frame of image frame.
In some exemplary embodiments, the dynamic lighting unit array is configured to determine the lighting units providing backlight for the image frames corresponding to the views in the following manner: when the display mode is a dual-view mode, if the current frame displays an image corresponding to a left view, the light-emitting units in odd columns are set as light-emitting units for providing backlight, and the light-emitting units in even columns are set as light-emitting units for providing backlight, and if the current frame displays an image corresponding to a right view, the light-emitting units in even columns are set as light-emitting units for providing backlight, and the light-emitting units in odd columns are set as light-emitting units for providing backlight.
In some exemplary embodiments, the dynamic lighting unit array is configured to determine the lighting units providing backlight for the image frames corresponding to the views in the following manner: when the display mode is a four-view mode, if the current frame displays an image corresponding to a left view, the light-emitting units in odd columns are set as light-emitting units for providing backlight, and the light-emitting units in even columns are set as light-emitting units for providing backlight, and if the current frame displays an image corresponding to a right view, the light-emitting units in even columns are set as light-emitting units for providing backlight, and the light-emitting units in odd columns are set as light-emitting units for providing backlight; and if the current frame displays the image corresponding to the back view, setting the light-emitting units in the odd rows as the light-emitting units for providing backlight, and setting the light-emitting units in the even rows as the light-emitting units for providing backlight, and setting the light-emitting units in the odd rows as the light-emitting units for providing backlight.
In some exemplary embodiments, the dynamic lighting unit array is configured to determine the lighting units providing backlight for the image frames corresponding to the views in the following manner: when the display mode is a K view mode, dividing all the light-emitting units into K groups, wherein the ith group of light-emitting units is used for providing backlight for the ith view, and i is more than or equal to 1 and less than or equal to K; if the current frame displays an image corresponding to the ith view, setting the lighting unit of the ith group as a lighting unit for providing backlight, and setting the lighting units of the other groups as non-lighting units; k is greater than or equal to 2; wherein any two groups of light emitting units may comprise completely different light emitting units or comprise partially identical light emitting units.
As shown in fig. 3, an embodiment of the present disclosure provides a display module, including: a backlight module 100 and a liquid crystal display panel 200;
the backlight source module is configured to determine a view corresponding to each frame of image according to a display mode and provide backlight corresponding to the view to the image frame;
the liquid crystal display panel is configured to determine a view corresponding to each frame of image according to a display mode and provide an image frame matched with the view;
wherein the display mode includes at least one of: single view mode, dual view mode, and multi-view mode.
The display module provided by the above embodiment includes a backlight module and a liquid crystal display panel, where the backlight module is configured to determine a view corresponding to each frame of image according to a display mode, and provide a backlight corresponding to the view for the image frame; the liquid crystal display panel is configured to determine a view corresponding to each frame of image according to a display mode, and provide an image frame matched with the view. The display module provided by the embodiment can realize the presentation of one or more views in multiple display modes by synchronously setting the backlight to the image frames corresponding to the views.
In some exemplary embodiments, one frame image corresponds to one view in any one display mode. Since one frame image corresponds to one view, the resolution of each frame image is not degraded.
In some exemplary embodiments, when the display mode is a single-view mode, each frame image corresponds to the same view, and the backlight direction of each frame image is the same; when the display mode is a dual-view mode, the left view corresponds to an image of an odd frame, the right view corresponds to an image of an even frame, and the backlight direction of the odd frame is different from the backlight direction of the even frame; when the display mode is a K view mode, the K views respectively correspond to K frame images, and the backlight directions of the K frame images are different; k is greater than or equal to 4. Under the dual-view mode/multi-view mode, the whole frames of different views are alternately/alternately displayed, and the directional backlight is combined, so that the display of any view angle can be realized, and the resolution of a display picture cannot be reduced.
In some exemplary embodiments, the backlight module is configured to provide correspondingly-directed backlight for image frames corresponding to views in the following manner: and if the view corresponding to the next frame image is different from the view corresponding to the previous frame image, closing the backlight corresponding to the previous frame image and opening the backlight corresponding to the next frame image before the image frame is switched to the next frame image.
In some exemplary embodiments, if the screen refresh rate of the liquid crystal display panel is f1 in the single view mode, the screen refresh rate is 2 × f1 in the dual view mode, and K × f1 in the K view mode; k is greater than or equal to 4.
In some exemplary embodiments, the screen refresh rate f1 is greater than or equal to 60 hertz in the single-view mode.
As shown in fig. 4, an embodiment of the present disclosure provides a driving method of a display module, including:
step S10, determining a view corresponding to each frame image according to the display mode, determining parameters of the dynamic slit grating according to the view and providing a light-emitting unit for backlight of the image frame corresponding to the view;
step S20, the dynamic light-emitting unit array emits light according to the view corresponding to the current frame, the dynamic slit grating shields the light-emitting surface of the light-emitting unit by using the barrier of the dynamic slit grating, so that the light emitted by the light-emitting unit becomes backlight pointing to the target direction corresponding to the view after passing through the dynamic slit grating, and the liquid crystal display panel provides an image frame matched with the view;
wherein the display mode includes at least one of: single view mode, dual view mode, and multi-view mode.
In the driving method of the display module according to the embodiment, the view corresponding to each frame of image is determined according to the display mode, the parameter of the dynamic slit grating is determined according to the view, and the light emitting unit providing backlight for the image frame corresponding to the view is provided; the dynamic slit grating shields the light emitting surface of the light emitting unit by using the barrier of the dynamic slit grating, so that the light emitted by the light emitting unit becomes backlight pointing to a target direction corresponding to the view after penetrating through the dynamic slit grating, and the liquid crystal display panel provides an image frame matched with the view. The display module driving method provided by the embodiment can realize the presentation of one or more views in multiple display modes by synchronously setting the backlight direction and the image frames corresponding to the views.
In some exemplary embodiments, one frame image corresponds to one view in any one display mode. Since one frame image corresponds to one view, the resolution of each frame image is not degraded.
In some exemplary embodiments, the dynamic light emitting unit array emits light according to a view corresponding to a current frame, and includes: and if the view corresponding to the next frame image is different from the view corresponding to the previous frame image, closing the backlight corresponding to the previous frame image and opening the backlight corresponding to the next frame image before the image frame is switched to the next frame image.
In some exemplary embodiments, when the display mode is a single-view mode, each frame image corresponds to the same view, and the backlight direction of each frame image is the same; when the display mode is a dual-view mode, the left view corresponds to an image of an odd frame, the right view corresponds to an image of an even frame, and the backlight direction of the odd frame is different from the backlight direction of the even frame; when the display mode is a K view mode, the K views respectively correspond to K frame images, and the backlight directions of the K frame images are different; k is greater than or equal to 4.
In some exemplary embodiments, if the screen refresh rate of the liquid crystal display panel is f1 in the single view mode, the screen refresh rate is 2 × f1 in the dual view mode, and K × f1 in the K view mode; k is greater than or equal to 4.
The purpose of parallax backlight can be achieved through a Mini-LED local light control technology, and functions of directional single-view display, double-view display, multi-view display and the like with lossless resolution can be achieved through parallax backlight and the alternate/alternate playing of the whole frames of different pictures by using a high-refresh-rate display screen.
Fig. 5-1 is a schematic view of single-view directional display in a single-view mode, in which the direction of backlight is adjusted by using the principle of parallax through a dynamic slit grating, so that single-view directional backlight can be realized.
Fig. 5-2 is a schematic diagram of dual-view directional display in a dual-view mode, and directional backlight at left and right angles is realized by adjusting local on/off of dynamic slit grating and Mini-LED backlight and using the principle of parallax, so that the peep-proof requirement of dual views can be met.
Fig. 5-3 are schematic diagrams of multi-view directional display in a multi-view display mode, in which the longitudinal and transverse directions of the dynamic slit grating are adjusted, the multi-directional backlight is adjusted by using the principle of parallax in cooperation with the Mini-LED backlight local light control technology, and different views can be displayed at any angles around the screen under the condition that the screen refresh rate is satisfied.
Generally, the light emitting model of a single LED is a lambertian model, and the light source light emitting diagram of the lambertian model is shown in fig. 6. A light beam pointing to a specific angle is obtained by a method of shielding a local light beam of a lambertian light source, when a Mini-LED array is used as a backlight source and a liquid crystal grating barrier is used for shielding partial light beams of all LEDs, a large-area light beam with a specific angle can be formed, and the light beam can be used as the backlight source. In combination with the high response speed of the LED and the high refresh rate of the liquid crystal, display functions such as a single view mode, a dual view mode, a multi view mode, etc. can be realized.
Fig. 7 shows a schematic diagram of light emitted by a lambertian light source passing through a liquid crystal slit grating. The light beam within the alpha angle of the Lambert light source penetrates through the liquid crystal grating gap with the width of n, and uniformly illuminates a display panel (panel) after passing through the distance D, the width of a single liquid crystal grating barrier is s, the distance between the liquid crystal grating and the light emitting surface of the Lambert light source is H, and the distance between the position of the LED lamp and the edge of the left barrier is m. The distance D between the display screen and the liquid crystal grating at least satisfies the following formula (1)
Figure BDA0003384138050000101
The uniformity of the backlight can be adjusted by adjusting the aperture ratio of the liquid crystal slit grating, the distance D between the display screen and the liquid crystal slit grating, the distance H, LED between the liquid crystal slit grating and the light emitting surface of the lambertian light source, the light emitting angle alpha and the like. Theoretically, the final far field viewing angle range is consistent with the angle alpha of the LED light.
In addition to controlling the uniformity and the direction angle of the LED output light, excessive stray light is also prevented, which can be generally achieved by controlling the emission angle of the light source and the width of the grating barrier, so as to minimize the light beam in the angle range of β and γ as much as possible.
When the light emitting angle of the LED is 120 degrees, the width of the LED is 0.5mm, and the grating constant of the liquid crystal grating is 2mm, the pointing direction of the backlight can be simulated through simulation operation, a light beam is emitted from the LED array and passes through the liquid crystal grating to obtain a fixed angle, the viewing angle range is within 20 degrees, and no stray light exists outside the viewing angle.
FIG. 8 is a schematic view of a single view directional display. The light emitted by the lambertian light source obtains a fixed emission angle after passing through the grating (dynamic LCD Barrier) and illuminates the whole screen (display panel) uniformly after a certain distance, and the light passing through the screen has a fixed emission angle and range.
FIG. 9 is a schematic diagram of a dual view directional display. As shown in fig. 9, the exit angle of the light beam is controlled by the liquid crystal grating (dynamic LCD grating barrier), the left light and the right light are sequentially emitted by dynamically adjusting the grating barrier, the left and right view backlights are emitted by switching the grating barrier during displaying, and the display panel displays the full resolution picture matching the left side and the right side respectively by matching the left side and the right side lights with a high refresh rate. Likewise, the viewing angle range can be changed at any time by adjusting the grating barrier according to the requirements.
Fig. 10 is a schematic diagram of driving signals in a dual-view directional display, which sequentially displays different pictures in two different directions (left view and right view) by using different timing sequences, and the period of each view is at most 8ms to ensure that the video can be normally viewed. The LEDs corresponding to the odd or even columns are shielded at different times by the grating barrier to obtain backlight at a specific angle.
The directional backlight in the multi-view display mode is consistent with the directional display principle of the single-view display mode or the dual-view display mode. Fig. 11 is a schematic diagram of a four-view directional display. Different frames are sequentially displayed in a plurality of (such as four) different directions (such as left, right, front and back) by utilizing the difference of time sequence, and the period for ensuring that the video can normally watch each view is at most 4 ms. A backlight of a certain angle is obtained by the raster barrier shielding the LEDs of corresponding odd and even columns or rows at different times. As shown in fig. 11, the LED lamps at the corresponding positions are respectively turned on, so that the directional backlight in four views can be obtained in sequence.
The embodiment of the application also provides a display device which comprises the display module.
The display device may be a liquid crystal display device. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (12)

1. A backlight module, comprising: a dynamic light emitting unit array and a dynamic slit grating; the dynamic light emitting unit array comprises a plurality of light emitting units arranged in an array;
the dynamic light-emitting unit array is configured to determine a view corresponding to each frame of image according to a display mode and provide a light-emitting unit with backlight for the image frame corresponding to the view;
the dynamic slit grating is configured to determine a view corresponding to each frame of image according to a display mode, determine parameters of the dynamic slit grating according to the view, and shield a light emitting surface of the light emitting unit by using a barrier of the dynamic slit grating, so that light emitted by the light emitting unit becomes backlight pointing to a target direction corresponding to the view after passing through the dynamic slit grating;
wherein the display mode includes at least one of: single view mode, dual view mode, and multi-view mode.
2. The backlight module of claim 1, wherein:
the light emitting unit includes: light emitting diodes LED, Mini-LED or Micro-LED.
3. The backlight module of claim 1, wherein:
the dynamic slit grating includes: a liquid crystal slit grating;
the parameters of the dynamic slit grating include at least one of: slit width, slit length, barrier width, and barrier length.
4. The backlight module of claim 1, wherein:
in any one display mode, one frame of image corresponds to one view;
when the display mode is a single-view mode, each frame of image corresponds to the same view, and the backlight direction of each frame of image is the same; when the display mode is a dual-view mode, the left view corresponds to an image of an odd frame, the right view corresponds to an image of an even frame, and the backlight direction of the odd frame is different from the backlight direction of the even frame; when the display mode is a K view mode, the K views respectively correspond to K frame images, and the backlight directions of the K frame images are different; k is greater than or equal to 4.
5. The backlight module of claim 1, wherein:
in any display mode, the light emitting units providing backlight for the image frames corresponding to different views are different or partially the same.
6. The backlight module of claim 1, wherein:
the backlight module further comprises: a light absorbing film; the light absorption film is arranged on one side, away from the dynamic slit grating, of the dynamic light emitting unit array and used for absorbing light incident to the light absorption film.
7. A display module, comprising: the backlight module and the liquid crystal display panel of any one of claims 1 to 6;
the backlight source module is configured to determine a view corresponding to each frame of image according to a display mode and provide backlight corresponding to the view to the image frame;
the liquid crystal display panel is configured to determine a view corresponding to each frame of image according to a display mode and provide an image frame matched with the view;
wherein the display mode includes at least one of: single view mode, dual view mode, and multi-view mode.
8. The display module of claim 7, wherein:
the backlight source module is configured to provide correspondingly directed backlight for the image frames corresponding to the views in the following manner: and if the view corresponding to the next frame image is different from the view corresponding to the previous frame image, closing the backlight corresponding to the previous frame image and opening the backlight corresponding to the next frame image before the image frame is switched to the next frame image.
9. A driving method of a display module comprises the following steps:
determining a view corresponding to each frame of image according to a display mode, determining parameters of the dynamic slit grating according to the view and providing backlight for the image frame corresponding to the view;
the dynamic slit grating shields the light emitting surface of the light emitting unit by using a barrier of the dynamic slit grating, so that the light emitted by the light emitting unit becomes backlight pointing to a target direction corresponding to a view after passing through the dynamic slit grating, and the liquid crystal display panel provides an image frame matched with the view;
wherein the display mode includes at least one of: single view mode, dual view mode, and multi-view mode.
10. The driving method according to claim 9, characterized in that:
in any one display mode, one frame of image corresponds to one view;
when the display mode is a single-view mode, each frame of image corresponds to the same view, and the backlight direction of each frame of image is the same; when the display mode is a dual-view mode, the left view corresponds to an image of an odd frame, the right view corresponds to an image of an even frame, and the backlight direction of the odd frame is different from the backlight direction of the even frame; when the display mode is a K view mode, the K views respectively correspond to K frame images, and the backlight directions of the K frame images are different; k is greater than or equal to 4.
11. The driving method according to claim 9, characterized in that:
if the screen refresh rate of the liquid crystal display panel in the single-view mode is f1, the screen refresh rate of the liquid crystal display panel in the dual-view mode is 2 x f1, and the screen refresh rate of the liquid crystal display panel in the K-view mode is K x f 1; k is greater than or equal to 4.
12. A display device comprising the display module of any one of claims 7-8.
CN202111443593.5A 2021-11-30 2021-11-30 Backlight module, display module, driving method and display device Pending CN114035339A (en)

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