CN114167648B - Backlight module, preparation method thereof and display panel - Google Patents
Backlight module, preparation method thereof and display panel Download PDFInfo
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- CN114167648B CN114167648B CN202111493866.7A CN202111493866A CN114167648B CN 114167648 B CN114167648 B CN 114167648B CN 202111493866 A CN202111493866 A CN 202111493866A CN 114167648 B CN114167648 B CN 114167648B
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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
- G02F1/1333—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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- 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
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
- G02F1/13345—Network or three-dimensional gels
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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
- G02F1/1333—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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
Abstract
The utility model provides a backlight unit and preparation method, display panel thereof, this backlight unit includes the lamp plate and sets up the ascending membrane of adjusting luminance of play light of lamp plate, the lamp plate includes a plurality of light emitting unit of array arrangement, the membrane of adjusting luminance includes a plurality of light modulating areas, every light modulating area corresponds a light emitting unit, the haze of the middle zone of every light modulating area is greater than the haze of the marginal zone of same light modulating area, the middle zone of light modulating area corresponds the middle zone of light emitting unit, the marginal zone of light modulating area corresponds the marginal zone of light emitting unit, make the membrane of adjusting luminance shade the lamp shadow of light emitting unit that can be fine, in order to alleviate the even light effect relatively poor problem that current backlight exists.
Description
Technical Field
The application relates to the technical field of display, in particular to a backlight module, a preparation method thereof and a display panel.
Background
With the development of liquid crystal display backlight technology, the conventional cold cathode fluorescent lamps (Cold Cathode Fluorescent Lamp, CCFL) have been replaced by light emitting diodes (Light Emitting Diode, LEDs) for the current backlight source. Compared with a sub-millimeter light emitting diode (Mini Light Emitting Diode, mini LED) backlight technology, the Mini LED backlight technology actually miniaturizes the traditional LED backlight, so that the Mini LED backlight technology has the advantages of smaller lamp beads, higher screen brightness under the same size, more backlight partitions and the like. However, the split backlight of the Mini LED backlight technology has a certain gap compared to the pixel level light control of the organic light emitting diode display device (Organic Light emitting Display, OLED). In addition, the existing Mini LED backlight technology has limited partition quantity, so that the uniform light effect of the whole backlight is poor.
Disclosure of Invention
The application provides a backlight module, a preparation method thereof and a display panel, so as to alleviate the technical problem of poor dodging effect of the existing backlight.
In order to solve the problems, the technical scheme provided by the application is as follows:
the embodiment of the application provides a backlight module, which comprises:
the lamp panel comprises a plurality of light-emitting units which are arranged in an array; and
the dimming film is arranged in the light emitting direction of the lamp panel and comprises a plurality of dimming areas, and each dimming area corresponds to one light emitting unit;
the haze of the middle area of each dimming area is larger than that of the edge area of the same dimming area, the middle area of each dimming area corresponds to the middle area of the light-emitting unit light-emitting range, and the edge area of each dimming area corresponds to the edge area of the light-emitting unit light-emitting range.
In the backlight module provided by the embodiment of the application, the material of the dimming film comprises polymer network liquid crystal, and the polymer network liquid crystal comprises a photoinitiator and a polymer, wherein the mass percentage range of the photoinitiator is 1-5%.
In the backlight module provided by the embodiment of the application, the backlight module further comprises a dimming box arranged on the light emitting direction of the lamp panel, and the dimming box comprises:
the dimming film is arranged on one side of the first substrate far away from the lamp panel;
the first electrode is arranged on one side of the dimming film away from the first substrate;
a second substrate disposed opposite to the first substrate; and
a plurality of liquid crystal molecules disposed between the first substrate and the second substrate.
In the backlight module provided by the embodiment of the application, the backlight module further comprises a dimming box arranged on the light emitting direction of the lamp panel, and the dimming box comprises:
the dimming film is arranged on one side of the first substrate far away from the lamp panel;
a second substrate disposed opposite to the first substrate;
a plurality of liquid crystal molecules disposed between the first substrate and the second substrate; and
the first electrode is arranged on one side of the second substrate facing the first substrate.
In the backlight module provided by the embodiment of the application, the dimming box further includes a second electrode, and the second electrode is disposed on the first substrate or the second substrate, and has an interval with the first electrode.
In the backlight module provided by the embodiment of the application, the first electrode includes a plurality of electrode patterns arranged in an array, and each light emitting unit corresponds to one or more electrode patterns.
In the backlight module provided in the embodiment of the application, the liquid crystal molecules include dye liquid crystal.
The embodiment of the application also provides a preparation method of the backlight module, which comprises the following steps:
providing a lamp panel, wherein the lamp panel comprises a plurality of light emitting units which are arranged in an array;
preparing a dimming film on a first substrate, and arranging the first substrate with the dimming film in the light emitting direction of the lamp panel, wherein the dimming film comprises a plurality of dimming areas, the haze of the middle area of each dimming area is larger than that of the edge area of the same dimming area, each dimming area corresponds to one light emitting unit, the middle area of each dimming area corresponds to the middle area of the light emitting range of the light emitting unit, and the edge area of each dimming area corresponds to the edge area of the light emitting range of the light emitting unit;
preparing a first electrode on a second substrate, aligning the second substrate with the first substrate, and enabling the first electrode to face the dimming film;
a plurality of liquid crystal molecules are disposed between the first substrate and the second substrate.
In the method for manufacturing a backlight module provided in the embodiment of the present application, the step of manufacturing the dimming film on the first substrate includes:
preparing a zoned exposure photomask according to the halation size and intensity of each light-emitting unit on the lamp panel;
and coating polymer network liquid crystal on the first substrate, and exposing the polymer network liquid crystal by using the partition exposure photomask to form the dimming film.
The embodiment of the application also provides a display panel, which comprises the backlight module of one of the embodiments.
The beneficial effects of this application are: the utility model provides a backlight unit and preparation method thereof, display panel in, backlight unit include the lamp plate and set up the ascending membrane of adjusting luminance of light-emitting direction of lamp plate, the lamp plate includes a plurality of light-emitting unit of array arrangement, the membrane of adjusting luminance includes a plurality of light-emitting areas, every the area of adjusting luminance corresponds one light-emitting unit, every the haze of the middle zone of adjusting luminance is greater than same the haze of the marginal zone of adjusting luminance, the middle zone of adjusting luminance corresponds the middle zone of the luminous scope of light-emitting unit, the marginal zone of adjusting luminance corresponds the marginal zone of the luminous scope of light-emitting unit, make the membrane of adjusting luminance can be fine shelter the shadow of light-emitting unit has solved the relatively poor problem of even light effect that current backlight exists.
Drawings
In order to more clearly illustrate the embodiments or the technical solutions in the prior art, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional structure of a backlight module according to an embodiment of the disclosure.
Fig. 2 is a detailed schematic diagram of a light emitting unit and a dimming area control on a dimming film according to an embodiment of the present application.
Fig. 3 is an SEM structure diagram of the polymer network liquid crystal after UV illumination according to the embodiment of the present application.
Fig. 4 is a schematic diagram of a partial top view structure of a zoned exposure mask according to an embodiment of the present disclosure.
Fig. 5 is a schematic cross-sectional structure of a backlight module according to an embodiment of the disclosure.
Fig. 6 is a schematic top view of a first electrode according to an embodiment of the present application.
Fig. 7 is a flowchart of a method for manufacturing a backlight module according to an embodiment of the present application.
Fig. 8 is a schematic cross-sectional structure of a display panel according to an embodiment of the disclosure.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments that can be used to practice the present application. The directional terms mentioned in this application, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], etc., are only referring to the directions of the attached drawings. Accordingly, directional terminology is used to describe and understand the application and is not intended to be limiting of the application. In the drawings, like elements are designated by like reference numerals. In the drawings, the thickness of some layers and regions are exaggerated for clarity of understanding and ease of description. I.e., the size and thickness of each component shown in the drawings are arbitrarily shown, but the present application is not limited thereto.
Referring to fig. 1 to 4, fig. 1 is a schematic cross-sectional structure of a backlight module provided in an embodiment of the present application, fig. 2 is a detailed schematic diagram of a light emitting unit provided in an embodiment of the present application and a contrast of a dimming area on a dimming film, fig. 3 is an SEM structure diagram of a polymer network liquid crystal after UV illumination provided in an embodiment of the present application, and fig. 4 is a schematic partial top view structure of a zonal exposure mask provided in an embodiment of the present application. The backlight module 100 includes a lamp panel 10 and a dimming film 20 disposed on the lamp panel 10 in a light emitting direction, wherein the lamp panel 10 includes a plurality of light emitting units 11 arranged in an array. The dimming film 20 includes a plurality of dimming regions TD, each of which corresponds to one of the light emitting units 11. The haze of the middle area CD1 of each dimming area TD is greater than the haze of the edge area BD1 of the same dimming area TD, the middle area CD1 of the dimming area TD corresponds to the middle area CD2 of the light emitting range LD of the light emitting unit 11, and the edge area BD1 of the dimming area TD corresponds to the edge area BD2 of the light emitting range LD of the light emitting unit 11.
Specifically, the backlight module 100 further includes a back plate 30, the back plate 30 is formed with a receiving cavity, and the lamp panel 10 and the dimming film 20 are both located in the receiving cavity of the back plate 30 and fixed on the back plate 30. In order to improve the utilization rate of the light emitted by the light emitting unit 11 on the lamp panel 10, the back plate 30 module is further provided with a reflective sheet 40. The reflecting plate 40 is located at the bottom of the accommodating cavity of the back plate 30, that is, at the side of the lamp panel 10 facing away from the dimming film 20. Of course, the reflective sheet 40 may also be located on the light panel 10, specifically, the light panel 10 includes a driving substrate 12 and a light emitting unit 11 disposed on the driving substrate 12, the light emitting unit 11 is electrically connected to the driving substrate 12, and the light emitting unit 11 includes a light emitting source such as an LED lamp, a Mini LED lamp, and the like. The reflecting sheet 40 is also disposed on the driving substrate 12, and an opening is disposed at a position corresponding to the light emitting unit 11, and the light emitting unit 11 passes through the opening. In addition, in order to balance the height difference between the light emitting units 11 on the driving substrate 12 and to protect the light emitting units 11, a protective layer (not shown) may be provided on the light emitting units 11, the protective layer covering the light emitting units 11 and the gaps between the light emitting units 11.
It can be understood that, in order to make the outgoing light of the backlight module 100 uniform, the backlight module 100 further includes a diffusion sheet 50 disposed on a side of the dimming film 20 away from the lamp panel 10. Of course, in order to improve the brightness of the backlight module 100, the backlight module 100 may further include an optical film such as a brightness enhancement film 60, and the optical films such as the diffusion sheet 50 and the brightness enhancement film 60 are not described herein again.
The structure of the light modulation film 20 and the light modulation principle will be specifically described as follows:
alternatively, the light modulation film 20 is formed on the first substrate 71, the light modulation film 20 and the first substrate 71 are disposed on the lamp panel 10 together, and of course, the first substrate 71 may be peeled off after the light modulation film 20 is formed. The material of the light modulation film 20 includes a polymer network liquid crystal (Polymer Network Liquid Crystal, PNLC) 21 and the like, the polymer network liquid crystal 21 includes a photoinitiator and a polymer 211, wherein the mass percentage of the photoinitiator ranges from 1% to 5%, preferably, the mass percentage of the photoinitiator is selected to be 3%. By adjusting the content of the photoinitiator in the polymer network liquid crystal 21, that is, adjusting the ratio of the photoinitiator to the polymer 211, polymerization of the polymer 211 can be accelerated when the polymer network liquid crystal 21 is subjected to UV illumination, so that the polymer network liquid crystal 21 forms an SEM (Scanning electron microscope ) structure diagram as shown in fig. 3. In fig. 3, the polymer 211 forms an aperture 2111 having a size close to that of the polymer network, and is integrally arranged in a net shape, and the structure has a good shielding effect on light, so that the dimming film 20 prepared by using the polymer network liquid crystal 21 has a shading function.
In addition, it can be understood that when facing the light emitting direction of the light emitting unit 11 on the lamp panel 10, the brightness of the middle area CD2 of the light emitting range LD of the light emitting unit 11 is greater than the brightness of the edge area BD2 of the light emitting range LD of the light emitting unit 11, so that the light shielding function of the light adjusting film 20 can be utilized to improve the brightness of the middle area CD2 of the light emitting range LD of the light emitting unit 11, so that the light emitting of the light emitting unit 11 is more uniform.
Specifically, the light modulation film 20 includes a plurality of light modulation regions TD, each light modulation region TD corresponds to one light emitting unit 11, and the corresponding relationship between one light modulation region TD and one light emitting unit 11 on the light modulation film 20 is illustrated in fig. 2. In order to make the light emission of the light emitting unit 11 more uniform by the dimming film 20, the dimming area TD of the dimming film 20 needs to have different haze in the light emitting areas corresponding to different brightness of the light emitting unit 11. Specifically, the haze of the middle area CD1 of the dimming area TD is greater than the haze of the edge area BD1 of the dimming area TD, where the middle area CD1 of the dimming area TD corresponds to the middle area CD2 of the light emitting range LD of the light emitting unit 11, and the edge area BD1 of the dimming area TD corresponds to the edge area BD2 of the light emitting range LD of the light emitting unit 11, so that the brightness of the light of the middle area CD2 of the light emitting range LD of the light emitting unit 11 and the brightness of the light of the edge area BD2 of the light emitting range LD are close after passing through the dimming film 20, so that the brightness of the outgoing light of the light emitting unit 11 on the whole lamp panel 10 is more uniform, and the problem of poor light homogenizing effect of the existing backlight is solved.
In order to form different haze in the middle area CD1 and the edge area BD1 of each light modulation area TD on the light modulation film 20, the polymer network liquid crystal 21 needs to be exposed by using a zoned exposure mask 80 to form the light modulation film 20, as shown in fig. 4. Specifically, the zoned exposure mask 80 can be used for making an exposure pattern according to the pitch of the halos of each light emitting unit 11 on the lamp panel 10, the size of the halos and the brightness of the halos. Then, the polymer network liquid crystal 21 is coated on the first substrate 71, after the coating is uniform, the light modulation film 20 is formed by exposing and developing the polymer network liquid crystal 21 on the first substrate 71 by using the partition exposure mask 80, and when the polymer network liquid crystal 21 is exposed by using the partition exposure mask 80, the light irradiation amount of the middle area CD1 and the edge area BD1 of the light modulation area TD on the light modulation film 20 is different by controlling the partition exposure mask 80, so that the middle area CD1 and the edge area BD1 of the light modulation area TD form different haze.
In an embodiment, referring to fig. 5 and fig. 6, fig. 5 is a schematic cross-sectional structure of a backlight module provided in an embodiment of the present application, and fig. 6 is a schematic top view of a first electrode provided in an embodiment of the present application. Unlike the above embodiment, the backlight module 100 further includes a dimming box 70 disposed in the light emitting direction of the lamp panel 10, and the dimming box 70 includes a first substrate 71, a second substrate 72, and a plurality of liquid crystal molecules 73 disposed between the first substrate 71 and the second substrate 72. In order to control the deflection of the liquid crystal molecules 73, the dimming cell 70 further includes a first electrode 74 and a second electrode 75, the first electrode 74 is disposed on a side of the second substrate 72 facing the first substrate 71, the second electrode 75 is disposed on a side of the first substrate 71 facing the second substrate 72, the dimming film 20 is disposed on a side of the first substrate 71 away from the lamp panel 10, specifically, the dimming film 20 is disposed on a side of the second electrode 75 away from the first substrate 71.
Specifically, the first electrode 74 includes a plurality of electrode patterns 741 arranged in an array to form a grid-like design, each electrode pattern 741 corresponds to a grid, and the second electrode 75 is a full-face common electrode. An electric field is formed between the first electrode 74 and the second electrode 75 to control the deflection of the liquid crystal molecules 73, and the liquid crystal molecules 73 corresponding to each grid can be independently deflected due to the grid-like design of the first electrode 74. Meanwhile, each light emitting unit 11 corresponds to one or more electrode patterns 741, so that the light emitted by each light emitting unit 11 can be independently debugged, so that each light emitting unit 11 is equivalent to a backlight partition, the number of the backlight partitions can be greatly increased, and the contrast ratio of the backlight partitions can be further improved. When each of the light emitting units 11 corresponds to a plurality of the electrode patterns 741, the adjustment of the backlight can be made finer, and a higher contrast can be achieved.
Further, the liquid crystal molecules 73 include dye liquid crystal, etc., and the dye liquid crystal can realize electrodeless dimming under power-up driving, and the transmittance is positively correlated with the driving voltage, so that the contrast ratio of the backlight can be further improved by using the dye liquid crystal.
In addition, in the present embodiment, alternatively, the second electrode 75 may be disposed on the second substrate 72 together with the first electrode 74, with a space between the first electrode 74 and the second electrode 75, so that the first electrode 74 and the second electrode 75 are insulated and separated to form an electric field. The other descriptions refer to the above embodiments, and are not repeated here.
In another embodiment, the positions of the first electrode 74 and the second electrode 75 are also interchangeable, i.e. the first electrode 74 is arranged on the first substrate 71 and the second electrode 75 is arranged on the second substrate 72. Specifically, the first electrode 74 is disposed on a side of the light modulation film 20 away from the first substrate 71, or the first electrode 74 is disposed between the first substrate 71 and the light modulation film 20, and the second electrode 75 is disposed on a side of the second substrate 72 facing the first substrate 71. Of course, similar to the above embodiment, the second electrode 75 and the first electrode 74 may also be disposed on the first substrate 71 at the same time, for example, the first electrode 74 is disposed between the first substrate 71 and the light modulation film 20, and the second electrode 75 is disposed on a side of the light modulation film 20 away from the first substrate 71, but the present application is not limited thereto, and the above description of the positional relationship between the first electrode 74 and the second electrode 75 is only illustrative, and the first electrode 74 and the second electrode 75 of the present application need to be spaced apart from each other to form insulation to enable the electric field to control the deflection of the liquid crystal molecules 73.
In an embodiment, referring to fig. 1 to fig. 7, fig. 7 is a schematic flow chart of the backlight module manufacturing method according to the embodiment of the present application. The preparation method of the backlight module comprises the following steps:
s301: providing a lamp panel 10, wherein the lamp panel 10 comprises a plurality of light emitting units 11 which are arranged in an array;
specifically, the lamp panel 10 includes a driving substrate 12 and a light emitting unit 11 disposed on the driving substrate 12, the light emitting unit 11 is electrically connected to the driving substrate 12, and the light emitting unit 11 includes a light emitting source such as an LED lamp, a Mini LED lamp, and the like. In addition, in order to balance the height difference between the light emitting units 11 on the driving substrate 12 and to protect the light emitting units 11, a protective layer (not shown) may be provided on the light emitting units 11, the protective layer covering the light emitting units 11 and the gaps between the light emitting units 11.
S302: preparing a dimming film 20 on a first substrate 71, and disposing the first substrate 71 provided with the dimming film 20 in a light emitting direction of the lamp panel 10, wherein the dimming film 20 comprises a plurality of dimming areas TD, a middle area CD1 of each dimming area TD is larger than a haze of an edge area BD1 of the same dimming area TD, each dimming area TD corresponds to one light emitting unit 11, a middle area CD1 of the dimming area TD corresponds to a middle area CD2 of a light emitting range LD of the light emitting unit 11, and an edge area BD1 of the dimming area TD corresponds to an edge area BD2 of the light emitting range LD of the light emitting unit 11;
specifically, the partitioned exposure mask 80 is manufactured according to the distance between halos of the light emitting units 11 on the lamp panel 10, the size of the halos, and the brightness of the halos, and the partitioned exposure mask 80 includes a plurality of exposure patterns, each exposure pattern corresponds to one light emitting unit 11. Then, the polymer network liquid crystal 21 is coated on the first substrate 71, and after the coating is uniform, the polymer network liquid crystal 21 on the first substrate 71 is exposed and developed by using the partition exposure mask 80 to form the dimming film 20 with a plurality of dimming areas TD, wherein each exposure pattern on the partition exposure mask 80 corresponds to one dimming area TD, and each dimming area TD thus formed corresponds to one light emitting unit 11. When the polymer network liquid crystal 21 is exposed by using the partition exposure mask 80, the partition exposure mask 80 is controlled to make the light amounts of the middle area CD1 and the edge area BD1 of the light modulation area TD on the light modulation film 20 different, so that the middle area CD1 and the edge area BD1 of the light modulation area TD form different haze. The haze of the middle area CD1 of each dimming area TD is greater than the haze of the edge area BD1 of the same dimming area TD, the middle area CD1 of the dimming area TD corresponds to the middle area CD2 of the light emitting range LD of the light emitting unit 11, and the edge area BD1 of the dimming area TD corresponds to the edge area BD2 of the light emitting range LD of the light emitting unit 11. Therefore, the brightness of the light beam in the middle area CD2 of the light emitting range LD of the light emitting unit 11 is close to the brightness of the light beam in the edge area BD2 of the light emitting range LD after passing through the light adjusting film 20, so that the brightness of the outgoing light beam of the light emitting unit 11 on the whole lamp panel 10 is more uniform, and the problem of poor light homogenizing effect of the existing backlight is solved.
S303: preparing a first electrode 74 on a second substrate 72, and aligning the second substrate 72 with the first substrate 71, with the first electrode 74 facing the light modulation film 20;
specifically, a transparent conductive film such as Indium Tin Oxide (ITO) is supported on the second substrate 72, and a yellow light process is performed on the transparent conductive film to form the first electrode 74. The first electrode 74 includes a plurality of electrode patterns 741 arranged in an array to form a grid-like design, and each electrode pattern 741 corresponds to one grid. Then, the second substrate 72 and the first substrate 71 are aligned and the first electrode 74 faces the light control film 20.
S304: a plurality of liquid crystal molecules 73 are disposed between the first substrate 71 and the second substrate 72.
Specifically, after the first substrate 71 and the second substrate 72 are aligned, liquid crystal molecules 73 are filled between the first substrate 71 and the second substrate 72, and the liquid crystal molecules 73 include dye liquid crystal and the like.
In addition, before the light modulation film 20 is prepared on the first substrate 71, a second electrode 75 is prepared on the first substrate 71, and the material of the second electrode 75 may be the same as that of the first electrode 74, but the second electrode 75 is a common electrode designed in whole. An electric field is formed between the first electrode 74 and the second electrode 75 to control the deflection of the liquid crystal molecules 73, and the liquid crystal molecules 73 corresponding to each grid can be independently deflected due to the grid-like design of the first electrode 74. Meanwhile, each light emitting unit 11 corresponds to one or more electrode patterns 741, so that the light emitted by each light emitting unit 11 can be independently debugged, so that each light emitting unit 11 is equivalent to a backlight partition, the number of the backlight partitions can be greatly increased, and the contrast ratio of the backlight partitions can be further improved. When each of the light emitting units 11 corresponds to a plurality of the electrode patterns 741, the adjustment of the backlight can be made finer, and a higher contrast can be achieved. Meanwhile, the dye liquid crystal can realize electrodeless dimming under the power-on drive, and the transmittance is positively correlated with the drive voltage, so that the contrast ratio of the backlight can be further improved by using the dye liquid crystal.
In an embodiment, the present application further provides a display panel 1000, please refer to fig. 8, fig. 8 is a schematic cross-sectional structure of the display panel according to the embodiment of the present application. The display panel 1000 includes the backlight module 100 according to one of the above embodiments, and the display panel 1000 further includes a liquid crystal display cell 200 disposed in a light emitting direction of the backlight module 100, a lower polarizer 400 disposed between the backlight module 100 and the liquid crystal display cell 200, and an upper polarizer 300 disposed on a side of the liquid crystal display cell 200 away from the backlight module 100, where the backlight module 100 is configured to provide backlight to the liquid crystal display cell 200.
As can be seen from the above embodiments:
the utility model provides a backlight unit and preparation method, display panel thereof, this backlight unit include the lamp plate and set up the ascending membrane of adjusting luminance of light-emitting direction of lamp plate, the lamp plate includes a plurality of light-emitting units of array arrangement, the membrane of adjusting luminance includes a plurality of light-adjusting regions, every the light-adjusting region corresponds one light-emitting unit, every the haze of the middle zone of light-adjusting region is greater than same the haze of the marginal zone of light-adjusting region, the middle zone of light-adjusting region corresponds the middle zone of light-emitting unit luminescence range, the marginal zone of light-adjusting region corresponds the marginal zone of light-emitting unit luminescence range for the membrane of adjusting luminance can be fine shielding the lamp shadow of light-emitting unit has solved the relatively poor problem of even light effect that current backlight exists. Meanwhile, a dimming box comprising the dimming film is further arranged in the backlight module, the first electrode of the dimming box comprises a plurality of electrode patterns distributed in an array, each light-emitting unit corresponds to one or more electrode patterns, the number of the partitions of the backlight is greatly increased, and then the contrast is also greatly increased.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The foregoing embodiments of the present application have been described in detail, and specific examples have been employed herein to illustrate the principles and embodiments of the present application, the above embodiments being provided only to assist in understanding the technical solutions of the present application and their core ideas; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (9)
1. A backlight module, comprising:
the lamp panel comprises a plurality of light-emitting units which are arranged in an array; and
the dimming film is arranged in the light emitting direction of the lamp panel and comprises a plurality of dimming areas, and each dimming area corresponds to one light emitting unit;
the haze of the middle area of each dimming area is larger than that of the edge area of the same dimming area, the middle area of each dimming area corresponds to the middle area of the light-emitting unit light-emitting range, and the edge area of each dimming area corresponds to the edge area of the light-emitting unit light-emitting range; the material of the dimming film comprises polymer network liquid crystal, the polymer network liquid crystal comprises a photoinitiator and a polymer, wherein the mass percentage of the photoinitiator ranges from 1% to 5%, so that the dimming film has a shading function to improve the brightness of the middle area of the light emitting range of the light emitting unit.
2. The backlight module according to claim 1, further comprising a dimming box disposed in a light emitting direction of the lamp panel, the dimming box comprising:
the dimming film is arranged on one side of the first substrate far away from the lamp panel;
the first electrode is arranged on one side of the dimming film away from the first substrate;
a second substrate disposed opposite to the first substrate; and
a plurality of liquid crystal molecules disposed between the first substrate and the second substrate.
3. The backlight module according to claim 1, further comprising a dimming box disposed in a light emitting direction of the lamp panel, the dimming box comprising:
the dimming film is arranged on one side of the first substrate far away from the lamp panel;
a second substrate disposed opposite to the first substrate;
a plurality of liquid crystal molecules disposed between the first substrate and the second substrate; and
the first electrode is arranged on one side of the second substrate facing the first substrate.
4. A backlight module according to claim 2 or 3, wherein the dimming box further comprises a second electrode, the second electrode is disposed on the first substrate or the second substrate, and a space is provided between the second electrode and the first electrode.
5. A backlight module according to claim 4, wherein the first electrode comprises a plurality of electrode patterns arranged in an array, and each light emitting unit corresponds to one or more electrode patterns.
6. A backlight module according to claim 4, wherein the liquid crystal molecules comprise dye liquid crystals.
7. The preparation method of the backlight module is characterized by comprising the following steps:
providing a lamp panel, wherein the lamp panel comprises a plurality of light emitting units which are arranged in an array;
preparing a dimming film on a first substrate, and arranging the first substrate provided with the dimming film in the light emitting direction of the lamp panel, wherein the dimming film comprises a plurality of dimming areas, the haze of the middle area of each dimming area is larger than that of the edge area of the same dimming area, each dimming area corresponds to one light emitting unit, the middle area of each dimming area corresponds to the middle area of the light emitting unit light emitting range, the edge area of each dimming area corresponds to the edge area of the light emitting unit light emitting range, the material of the dimming film comprises polymer network liquid crystal, the polymer network liquid crystal comprises a photoinitiator and a polymer, and the mass percentage of the photoinitiator ranges from 1% to 5%, so that the dimming film has a shading function to improve the brightness of the middle area of the light emitting unit light emitting range;
preparing a first electrode on a second substrate, aligning the second substrate with the first substrate, and enabling the first electrode to face the dimming film;
a plurality of liquid crystal molecules are disposed between the first substrate and the second substrate.
8. The method of claim 7, wherein the step of preparing a dimming film on the first substrate comprises:
preparing a zoned exposure photomask according to the halation size and intensity of each light-emitting unit on the lamp panel;
and coating the polymer network liquid crystal on the first substrate, and exposing the polymer network liquid crystal by using the partition exposure photomask to form the dimming film.
9. A display panel comprising a backlight module according to any one of claims 1 to 6.
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| CN112445023A (en) * | 2019-08-29 | 2021-03-05 | 惠州视维新技术有限公司 | Backlight module, display equipment and control method thereof |
| JP7434816B2 (en) * | 2019-11-11 | 2024-02-21 | Ｔｏｐｐａｎホールディングス株式会社 | lighting equipment |
| JP7320430B2 (en) * | 2019-11-12 | 2023-08-03 | 株式会社エンプラス | Surface light source device and display device |
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