CN110286518B - Display module, control method thereof and display device - Google Patents

Display module, control method thereof and display device Download PDF

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Publication number
CN110286518B
CN110286518B CN201910684006.8A CN201910684006A CN110286518B CN 110286518 B CN110286518 B CN 110286518B CN 201910684006 A CN201910684006 A CN 201910684006A CN 110286518 B CN110286518 B CN 110286518B
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Prior art keywords
light
display
display panel
backlight module
independent control
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CN201910684006.8A
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CN110286518A (en
Inventor
张金风
董慧
辛武根
吴芳芳
韩振宇
许海峰
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • 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
    • 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
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells

Abstract

The invention provides a display module, a control method thereof and a display device, wherein the display module comprises: the backlight module comprises a plurality of independent control areas; the display panel is arranged on one side of the direct type backlight module; the light blocking assembly is arranged on one side, close to the display panel, of at least one independent control area and used for preventing delayed light of the direct type backlight module from being emitted out of the display module through the display panel when a light source in the independent control area is changed from a bright state to a dark state. The display module can realize high color gamut and high contrast, and when the screen of the display panel is suddenly turned into a dark state, red light afterimage cannot appear on the display panel, and the display quality is high.

Description

Display module, control method thereof and display device
Technical Field
The invention relates to the technical field of display, in particular to a display module, a control method thereof and a display device.
Background
At present, direct-type and high-color-gamut backlight modules are mostly adopted in high-end products of display devices such as mobile phones and televisions, meanwhile, the backlight modules generally have a local dimming function, so that part of light sources in the backlight modules are powered OFF to reduce the dark-state brightness, and high contrast is realized, but the light emitting time of fluorescent powder (such as KSF fluorescent powder) in the light source of the high-color-gamut backlight modules is long due to the material characteristics of the fluorescent powder, and even can exceed the response time of liquid crystal in a display panel, for example, the LED light source needs 20ms to emit red light from an ON state (ON) to an OFF state (OFF), and the phenomenon of delayed light emission causes the problem of red light under a dark-state picture, generates red residual images, and affects the display quality.
Thus, the related art of the current display device still needs to be improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a display module capable of effectively avoiding the problem of red afterimage.
In one aspect of the invention, a display module is provided. According to an embodiment of the present invention, the display module includes: the backlight module comprises a plurality of independent control areas; the display panel is arranged on one side of the direct type backlight module; the light blocking assembly is arranged on one side, close to the display panel, of at least one independent control area and used for preventing delayed light of the direct type backlight module from being emitted out of the display module through the display panel when a light source in the independent control area is changed from a bright state to a dark state. The display module can realize high color gamut and high contrast, and when the screen of the display panel is suddenly turned into a dark state, red light afterimage cannot appear on the display panel, and the display quality is high.
According to the embodiment of the invention, one light blocking component is arranged on one side, close to the display panel, of each independent control area.
According to the embodiment of the invention, the light blocking assembly is arranged between the direct type backlight module and the display panel.
According to the embodiment of the invention, the light blocking assembly is arranged on the surface of the display panel far away from the direct type backlight module.
According to an embodiment of the present invention, the light blocking assembly includes: the first transparent electrode and the second transparent electrode are oppositely arranged; a liquid crystal layer disposed between the first and second transparent electrodes.
According to an embodiment of the invention, each of said independent control areas comprises a plurality of light sources.
According to an embodiment of the invention, the light source is an LED light source containing a fluoride phosphor.
In another aspect of the present invention, a method for controlling the display module is provided. According to an embodiment of the invention, the method comprises: determining a target independent control area which needs to be changed from a bright state to a dark state in the direct type backlight module according to a display image signal of the display panel; so that the light-blocking component arranged at one side of the target independent control area close to the display panel is in a light-tight state. From this, can effectively avoid display module's ruddiness afterimage problem through hindering light assembly, improve display module's display quality greatly.
According to the embodiment of the invention, the light-tight state is kept for the same time as the light-emitting time of the light source in the direct type backlight module.
In still another aspect of the present invention, the present invention also provides a display device. According to an embodiment of the invention, the display device comprises the display module. Therefore, the display device can effectively avoid the red light afterimage problem, can realize high color gamut and high contrast, and obviously improves the display quality.
Drawings
Fig. 1 is a schematic plan view of a direct-type backlight module according to an embodiment of the invention.
Fig. 2 is a schematic diagram of relative positions of a direct-type backlight module and a light blocking assembly according to an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a display module according to an embodiment of the invention.
FIG. 4 is a plot of the emission time of KSF phosphor.
FIG. 5 is a schematic diagram of relative positions of a direct-type backlight module and a light blocking assembly according to another embodiment of the present invention.
Fig. 6 is a schematic cross-sectional view illustrating a display module according to an embodiment of the invention.
Fig. 7 is a schematic cross-sectional view of a display module according to another embodiment of the invention.
Fig. 8 is a schematic structural diagram of a light blocking assembly according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of the operation of the light blocking assembly according to one embodiment of the present invention.
Detailed Description
The following describes embodiments of the present invention in detail. The following examples are illustrative only and are not to be construed as limiting the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
In one aspect of the invention, a display module is provided. According to an embodiment of the present invention, referring to fig. 1 to 3, the display module includes: the backlight module 10 comprises a plurality of independent control areas 101, a plurality of light sources and a plurality of light sources, wherein the light sources are arranged in the independent control areas 101; the display panel 20, the said display panel 20 is set up in one side of the said direct type backlight module 10; and the light blocking assembly 30 is arranged on one side of at least one independent control area 101 close to the display panel 20, and is used for preventing delayed light emitted by the direct type backlight module 10 from exiting the display module through the display panel 20 when the light sources 101 in the independent control area are changed from a bright state to a dark state. The display module can realize high color gamut and high contrast, and when the screen of the display panel is suddenly turned into a dark state, red light afterimage cannot appear on the display panel, and the display quality is high.
Specifically, in order to improve the quality of the display module and realize high contrast, part of light sources in the direct type backlight module need to be changed from bright to dark (such as direct power-off) suddenly, energy in the light sources is usually not released immediately, but certain release time (namely light release time) is needed, especially, the release time of red light is longer, even exceeds the response time of liquid crystal in the display panel, at the moment, delayed red light can be seen in a dark state under a dark state picture under the irradiation of light sources in other areas, the red light afterimage problem occurs, the light blocking component can not allow the delayed light emission of the backlight module to be emitted out of the display module within the release time, so that human eyes can not see the red light afterimage, and the display quality is obviously improved.
It should be noted that the delayed light emission of the direct-type backlight module means that when the light source in the direct-type backlight module is changed from a bright state to a dark state (for example, power off), the energy in the light source is not completely released immediately, but a certain release time (i.e., light release time) is required, and the light source still emits light in the release process, that is, the delayed light emission is obtained.
As can be understood by those skilled in the art, the direct-type backlight module generally includes a plurality of light sources 102, and in order to achieve a better display effect, the direct-type backlight module can perform local dimming, specifically, each light source can be independently controlled, that is, each light source works independently and does not affect other light sources, and the brightness of each light source can be arbitrarily adjusted according to needs; it is also possible to control a group of light sources synchronously, and control a plurality of groups of light sources independently, taking a group of light sources including 10 light sources as an example, that is, the brightness of each group of light sources can be arbitrarily adjusted as required, and the same brightness of 10 light sources in a group of light sources is always the same. The light source or group of light sources that can be operated independently can be an independent control area. In some embodiments, a plurality of light sources may be included in one independent control area (refer to fig. 1) in consideration of various factors such as wiring, manufacturing process, and display effect. Therefore, the wiring structure is simple, the preparation is easy, and the display effect is better.
According to the embodiment of the invention, in order to make the display module have higher color gamut and higher display quality, the light source in the direct type backlight module is an LED light source containing fluoride fluorescent powder (such as KSF fluorescent powder). Therefore, the display module has higher color gamut and better display quality, however, as can be seen from the light emission time curve of the KSF phosphor shown in fig. 4, it takes about 20ms to completely emit energy from the power-off of the LED light source containing the KSF phosphor, and the response times of the typical liquid crystal display panels with 60Hz, 120Hz, 144Hz, and 240Hz are 16.7ms, 8.3ms, 6.94ms, and 4.17ms, respectively, which means that when the local image of the display panel is suddenly changed to the dark state, the local LED light source is powered off to improve the contrast, and the light emission time of the KSF phosphor is much longer than the response time of the liquid crystal, and under the illumination of the LED light sources in other areas, the red afterimage in the dark state image area can be recognized by naked eyes. The display module provided by the invention with the light blocking component can effectively prevent delayed luminescence of the backlight module from emitting out of the display module, so that the display module has higher display quality, can effectively avoid the defect of long light emitting time of the KSF fluorescent powder, can realize high color gamut, and cannot bring the problem of red light afterimage.
According to the embodiment of the invention, the specific distribution mode of the light-blocking components can be flexibly adjusted according to actual use requirements. Specifically, the light blocking member may be disposed only on a side of the partial independent control region close to the display panel (refer to fig. 2), for example, the light blocking member may be disposed in a region where red afterimage is relatively easily generated by experience or detection. In order to achieve a better display effect and completely eliminate the red light afterimage problem, one light blocking assembly (refer to fig. 5) may be disposed at a side of each of the independent control regions close to the display panel.
According to the embodiment of the present invention, the arrangement position of the light blocking assembly in the display module is not particularly limited as long as the light blocking assembly can block delayed light emission and stray light in the direct type backlight module from exiting the display module and entering human eyes, that is, the light blocking assembly is arranged between the light source of the direct type backlight module and the human eyes. In some embodiments, referring to fig. 6, the light blocking assembly 30 is disposed between the direct-type backlight module 10 and the display panel 20, specifically, may be disposed on a surface of the direct-type backlight module close to the display panel, or may be disposed on a surface of the display panel close to the direct-type backlight module. In other embodiments, referring to fig. 7, the light blocking assembly 30 is disposed on a surface of the display panel 20 away from the direct-type backlight module 10. Therefore, the display module can be well compatible with other structures in the display module, is convenient to prepare and assemble, and has a good light blocking effect.
According to the embodiment of the present invention, the specific structure of the light blocking assembly is not particularly limited, as long as the light source in the backlight module is changed from a bright state to a dark state, and the delayed light emission of the backlight module can be prevented from entering human eyes without affecting normal display. In some embodiments, referring to fig. 8, the light blocking assembly 30 includes: a first transparent electrode 31 and a second transparent electrode 32 disposed opposite to each other; a liquid crystal layer 33, the liquid crystal layer 33 being disposed between the first transparent electrode 31 and the second transparent electrode 32. Therefore, voltage can be applied to the liquid crystal layer through the first electrode and the second electrode to enable liquid crystal molecules in the liquid crystal layer to deflect, when a light source in the backlight module is changed from a bright state to a dark state, the liquid crystal layer is enabled to be light-tight by applying proper voltage to control the deflection direction of the liquid crystal molecules (for example, the long axes of the liquid crystal molecules are parallel to the display panel), delayed luminescence and stray light of the backlight module are blocked by the light blocking component, when the light source is in the bright state, the voltage can be adjusted to enable the deflection direction of the liquid crystal molecules (for example, the long axes of the liquid crystal molecules are perpendicular to the display panel) to enable the liquid crystal layer to be light-transmitting, light emitted by the backlight module can normally emit out of the display module, and the realization of a display function is guaranteed.
In an embodiment of the present invention, when the predetermined light source in the direct-type backlight module is in a bright state, referring to the left diagram in fig. 9, a voltage is applied between the first transparent electrode 301 and the second transparent electrode 302, so that the long axis direction of the liquid crystal molecules is parallel to the direction of the light emitted from the backlight module, at this time, the liquid crystal layer 303 is transparent, the light emitted from the backlight module can be emitted from the display module, thereby implementing a display function, and when the predetermined light source in the direct-type backlight module is converted from a bright state to a dark state, no voltage is applied between the first transparent electrode 301 and the second transparent electrode 302, the long axis direction of the liquid crystal molecules is perpendicular to the direction of the light emitted from the backlight module, at this time, the liquid crystal layer 303 is opaque, the delayed light emission of the light source in the backlight module is blocked by the light blocking component, thereby effectively avoiding the problem of red light residual image.
According to an embodiment of the present invention, the material of the first transparent electrode and the second transparent electrode may be a transparent conductive oxide, such as Indium Tin Oxide (ITO), indium zinc oxide, and the like, thereby having a large light transmittance and a good conductivity. The specific types of the liquid crystal molecules in the liquid crystal layer may be conventional liquid crystal molecules in the art, and are not described in detail herein.
In another aspect of the present invention, a method for controlling the display module is provided. According to an embodiment of the invention, the method comprises: determining a target independent control area which needs to be changed from a bright state to a dark state in the direct type backlight module according to a display image signal of the display panel; so that the light-blocking component arranged at one side of the target independent control area close to the display panel is in a light-tight state. From this, can effectively avoid display module's ruddiness afterimage problem through hindering light assembly, improve display module's display quality greatly.
Those skilled in the art can understand that the above control method can be controlled by a control circuit of the display module, and specifically, the control method can relate to that a time sequence control circuit (T-CON) of the display module has a corresponding control function, receives and analyzes an image signal through the time sequence control circuit, receives information of a light source of a corresponding backlight module, determines an area of a power-off light source, and then controls a corresponding light blocking assembly to arrange vertical light of an oblong liquid crystal inside the light blocking assembly, so as to prevent a red light afterimage from entering human eyes.
According to the embodiment of the invention, in order to not affect the normal display of the display module, the holding time of the opaque state is the same as the light emitting time of the light source in the direct type backlight module. Therefore, the problem of red light residual image can be well solved, and meanwhile, the good display effect of the display module can be guaranteed.
In still another aspect of the present invention, the present invention also provides a display device. According to an embodiment of the invention, the display device comprises the display module. Therefore, the display device can effectively avoid the red light afterimage problem, can realize high color gamut and high contrast, and obviously improves the display quality.
According to an embodiment of the present invention, a specific kind of the display device is not particularly limited, and may be any display device in the art, specifically, such as a mobile phone, a desktop computer, a tablet computer, a game machine, a picture screen, a home appliance having a display panel, a game machine, a wearable device, and the like. Meanwhile, those skilled in the art can understand that, in addition to the display module described above, the display device may further include structures and components necessary for a conventional display device, and for example, a mobile phone may further include a touch module, a fingerprint identification module, a camera module, a battery, a motherboard, a housing, and the like, which are not described in detail herein.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (7)

1. A display module, comprising:
the backlight module comprises a plurality of independent control areas;
the display panel is arranged on one side of the direct type backlight module;
the light blocking assembly is arranged on one side of at least one independent control area close to the display panel and used for preventing delayed light of the direct type backlight module from being emitted out of the display module through the display panel when a light source in the independent control area is changed from a bright state to a dark state,
wherein one side of each independent control area close to the display panel is provided with one light blocking component,
each independent control area comprises a plurality of light sources, and the light sources are LED light sources containing fluoride fluorescent powder.
2. The display module according to claim 1, wherein the light blocking member is disposed between the direct-type backlight module and the display panel.
3. The display module according to claim 1, wherein the light blocking member is disposed on a surface of the display panel away from the direct-type backlight module.
4. The display module according to any one of claims 1-3, wherein the light blocking assembly comprises:
the first transparent electrode and the second transparent electrode are oppositely arranged;
a liquid crystal layer disposed between the first and second transparent electrodes.
5. A method for controlling the display module according to any one of claims 1-4, comprising:
determining a target independent control area which needs to be changed from a bright state to a dark state in the direct type backlight module according to a display image signal of the display panel;
so that the light-blocking component arranged at one side of the target independent control area close to the display panel is in a light-tight state.
6. The method as claimed in claim 5, wherein the opaque state is maintained for the same time as the light-emitting time of the light source in the direct-type backlight module.
7. A display device, characterized by comprising the display module of any one of claims 1-4.
CN201910684006.8A 2019-07-26 2019-07-26 Display module, control method thereof and display device Active CN110286518B (en)

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