CN114545683A - Backlight module and MiniLED display device - Google Patents
Backlight module and MiniLED display device Download PDFInfo
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- CN114545683A CN114545683A CN202210106016.5A CN202210106016A CN114545683A CN 114545683 A CN114545683 A CN 114545683A CN 202210106016 A CN202210106016 A CN 202210106016A CN 114545683 A CN114545683 A CN 114545683A
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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
- G02F1/1335—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
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
Abstract
The application relates to a backlight unit and MiniLED display device belongs to display device technical field, backlight unit includes: the backlight module comprises a back plate, a plurality of circuit substrates, a plurality of luminous bodies, a diffusion plate, a first optical film layer and a second optical film layer, wherein the back plate, the plurality of circuit substrates are sequentially stacked from upstream to downstream along a light ray outgoing direction, the plurality of luminous bodies are arranged on each circuit substrate in an array mode, the first optical film layer is provided with a first ink pattern at a position corresponding to each luminous body, the second optical film layer is provided with a second ink pattern at a position corresponding to each luminous body, the projection parts of the first ink pattern and the second ink pattern corresponding to each luminous body in a reference plane are overlapped, the overlapped area is opposite to the corresponding luminous body, and the reference plane is parallel to the first optical film layer and/or the second optical film layer. According to the backlight module, the thickness of the diffusion plate can be reduced correspondingly, the light mixing distance is shortened, and the MiniLED display device can be integrally reduced.
Description
Technical Field
The application relates to the technical field of display screens, in particular to a backlight module and a MiniLED display device.
Background
The MiniLED display device is a thin film transistor liquid crystal display using MiniLED backlight technology, and generally, thousands of micro LEDs are uniformly welded on a circuit substrate, and the circuit substrate only supports a small size at present, so that when the MiniLED display device is used as a large-size backlight module, a plurality of circuit substrates are often required to be spliced into a corresponding large-size circuit substrate to form a surface light source which is highly uniform and can be independently controlled in a partition manner. Often will reserve the space for the circuit substrate expends with heat and contracts with cold, can leave the piece between two adjacent miniLED circuit substrates, so because there is not luminous body in piece department, the dark space can appear. Because LED central brightness is higher, if need weaken the dot matrix effect of luminous body, just need strengthen the effect of mixing light, and the reinforcing means again needs increase the diffuser plate thickness, and the increase of diffuser plate thickness will lead to miniLED display device whole thickness to increase, for avoiding appearing showing the inequality, generally adopt thicker diffuser plate, or many diffusion film schemes to and increase the distance of mixing light, make the module thicker. This is not conform to the current trend to MiniLED display device ultra-thinization, also has among the prior art to strengthen the effect of mixing light through the printing ink layer, but the printing of printing ink layer is complicated, and the effect of mixing light is relatively poor.
Disclosure of Invention
The invention provides a backlight module which can enhance the light mixing effect of a luminous body without increasing the thickness of a diffusion plate and has the advantage of simple printing process of ink patterns.
The backlight module according to the embodiment of the invention comprises: from supreme backplate of stacking gradually the setting down, a plurality of circuit substrate of array distribution, a plurality of luminous bodies of locating on every circuit substrate, the diffuser plate, first optics rete and second optics rete, first optics rete is equipped with first printing ink pattern corresponding to the position department of luminous body, second optics rete is equipped with second printing ink pattern corresponding to the position department of luminous body, the projection part of first printing ink pattern and the second printing ink pattern that every luminous body corresponds overlaps in the reference plane, the overlap region is relative with the luminous body that corresponds, wherein, the reference plane is on a parallel with first optics rete and/or second optics rete.
For unfolding, the projection parts of the first ink pattern and the second ink pattern in the reference plane are overlapped, the light at the luminous body is strongest, the overlapped area enables the light transmission to be weaker due to the overlapping of the two layers of ink patterns (the first ink pattern and the second ink pattern), the farther the distance from the luminous body is, the weaker the light is, the non-overlapped part of the projection of the first ink pattern and the projection of the second ink pattern is stronger than the overlapped area, when the backlight module is applied to the display device, the brightness unevenness of the display device can be improved, the display device has a better display effect, the thickness of the diffusion plate can be correspondingly thinned, the light mixing distance is shortened, and the display device can be integrally thinned.
According to the backlight module provided by the embodiment of the invention, when the backlight module is applied to the MiniLED display device, the brightness unevenness of the MiniLED display device can be improved, so that the MiniLED display device has a better display effect, the thickness of the diffusion plate can be correspondingly reduced, the light mixing distance is shortened, the MiniLED display device can be integrally reduced, and meanwhile, the backlight module has the advantage that the printing process of the ink patterns (the first ink pattern and the second ink pattern) is simple.
According to the backlight module provided by the embodiment of the invention, the central axis of the first ink pattern and the central axis of the second ink pattern are coincided with the central axis of the luminous body, and the colors of the first ink pattern and the second ink pattern are gradually lightened along the direction gradually far away from the central axis of the luminous body.
Optionally, the first ink pattern and the second ink pattern are both centrosymmetric patterns.
Optionally, the first ink pattern includes one of a circle, an ellipse, a square, and a rectangle, and the second ink pattern includes one of a circle, an ellipse, a square, and a rectangle.
Optionally, the first ink pattern is rotated by a certain angle with the central axis as the rotation center, and then is overlapped with the second ink pattern.
Optionally, the projections of the first ink pattern and the second ink pattern in the reference plane together constitute a figure that is symmetrical with respect to both the X-axis and the Y-axis.
According to the backlight module provided by the embodiment of the invention, the first ink pattern and the second ink pattern respectively comprise a first coloring area and a plurality of second coloring areas which are positioned in the center, the first coloring area and the second coloring areas are respectively in a centrosymmetric pattern, the plurality of second coloring areas gradually surround the first coloring area, the color depth of the plurality of second coloring areas gradually decreases along the direction which is gradually far away from the first coloring area, and the plurality of second coloring areas are respectively complete and continuous areas which extend along the circumferential direction and can be connected end to end.
According to the backlight module provided by the embodiment of the invention, the two adjacent circuit substrates define a seam, and the seam is coated with the reflective material.
Optionally, the first optical film layer includes at least one of a diffusion sheet, a prism sheet, and a quantum dot film, and the second optical film layer includes at least one of a diffusion sheet, a prism sheet, and a quantum dot film.
The MiniLED display device according to the embodiment of the invention comprises: the shell is connected with the display panel to jointly define a mounting cavity, the backlight module is arranged in the mounting cavity and stacked with the display panel, and the display panel is located on the light emitting side of the backlight module.
The utility model discloses a display panel, including first optical film layer, first printing ink pattern and second printing ink pattern, the light of luminous body department is the strongest, the overlap area makes the light transmissivity weaker because the stack of two-layer printing ink pattern (first printing ink pattern and second printing ink pattern) in the display panel, and the distance luminous body is far away more, light is weaker, the non-overlapping part of the projection of first printing ink pattern and the projection of second printing ink pattern, the light transmissivity is stronger than the overlap area, can improve the effect that finally appears in display panel, slow down the not good influence of demonstration of piece dark space, make MiniLED display device have better display effect, can attenuate the thickness of diffusion plate correspondingly, shorten the mixed light distance, make MiniLED display device can whole attenuate.
According to the MiniLED display device provided by the embodiment of the invention, the gradual change effect is realized by overlapping the two layers of printing ink patterns, and the light intensity at the center of the luminous body is weakened, so that the strong bright part of the display device can be subjected to a certain light intensity homogenizing effect, the difference between the light intensity at the abutted seam and the light intensity at the center of the luminous body is prevented from being large, the uneven brightness of the MiniLED display device can be improved, and the MiniLED display device has a better display effect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a side view of a backlight module according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an arrangement of light emitters on a circuit substrate of a backlight module according to an embodiment of the invention;
FIG. 3 is a schematic view of a first optical film layer of a backlight module according to some embodiments of the invention;
FIG. 4 is an enlarged partial schematic view of FIG. 3;
FIG. 5 is a diagram of a second optical film layer of a backlight module according to some embodiments of the invention;
FIG. 6 is a schematic view of the projection of a first ink pattern and a second ink pattern of a backlight module according to some embodiments of the invention on a reference plane;
FIG. 7 is an enlarged partial schematic view of FIG. 6;
FIG. 8 is a schematic illustration of a section of the overlapping area of the first ink pattern and the second ink pattern of FIG. 6;
FIG. 9 is a schematic view of a first optical film layer of a backlight module according to still other embodiments of the invention;
FIG. 10 is a diagram illustrating a second optical film layer of a backlight module according to still other embodiments of the invention.
Reference numerals:
a backlight module (1) is provided,
a circuit substrate 10, a light emitter 20, a diffusion plate 30, a first optical film 40, a first ink pattern 41, a first colored region a, a second colored region b, a second optical film 50, a second ink pattern 51, a lower polarizer 60, a TFT substrate 70, a CF substrate 80, an upper polarizer 90, a back plate 100,
a display panel 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, a backlight module 1 according to an embodiment of the present invention includes: the backlight module comprises a back plate 100, a plurality of circuit substrates 10 distributed in an array, a plurality of light emitters 20 arranged on each circuit substrate 10, a diffusion plate 30, a first optical film layer 40 and a second optical film layer 50 which are sequentially stacked from upstream to downstream in a light emitting direction.
Specifically, a plurality of circuit substrates 10 are arranged on the back plate 100 in an array manner, each circuit substrate 10 is provided with a plurality of light emitters 20, two adjacent circuit substrates 10 define a splicing seam, so as to reserve a space for preventing the circuit substrates 10 from being peeled off from the back plate 100 due to mutual extrusion caused by expansion with heat and contraction with cold, and generally, the back plate 100 is a glass substrate.
As shown in fig. 2, a plurality of light emitters 20 are disposed on the circuit substrate 10 in an array manner. Because the luminous bodies 20 of the MiniLED backlight module 1 need to be controlled in a partitioned manner, the plurality of circuit substrates 10 are arranged for splicing, and the plurality of luminous bodies 20 are controlled independently in a partitioned manner.
It should be noted that the light emitting body 20 may be an LED lamp bead or an LED chip.
Next, for the backlight module 1 disposed at the side face, it is common that what corresponds from upstream to downstream in the light exit direction is the direction from bottom to top of the embodiment shown in the drawings.
As shown in fig. 3 and 4, the first optical film layer 40 is provided with a first ink pattern 41 at a position corresponding to the light emitter 20, as shown in fig. 5, and the second optical film layer 50 is provided with a second ink pattern 51 at a position corresponding to the light emitter 20, as shown in fig. 6, the projection portions of the first ink pattern 41 and the second ink pattern 51 corresponding to each light emitter 20 in the reference plane 2 are overlapped, and the overlapped region is opposite to the corresponding light emitter 20, wherein the reference plane 2 is parallel to the first optical film layer 40 and/or the second optical film layer 50.
It is understood that, for "the first optical film layer 40 is provided with the first ink pattern 41 at the position corresponding to the luminophor 20", where "the position corresponding to the luminophor 20" means that the first ink pattern 41 is substantially opposite to the luminophor 20, and the projection of the luminophor 20 in the reference plane 2 falls within the projection area of the first ink pattern 41 in the reference plane 2, the central axis of the first ink pattern 41 may coincide with or be offset from the central axis of the luminophor 20.
Similarly, for the "position of the second optical film layer 50 corresponding to the illuminant 20 is provided with the second ink pattern 51", and for the "position corresponding to the illuminant 20" herein, it means that the second ink pattern 51 is substantially opposite to the illuminant 20, the projection of the illuminant 20 in the reference plane 2 falls within the projection area of the second ink pattern 51 in the reference plane 2, and the central axis of the second ink pattern 51 may coincide with or be offset from the central axis of the illuminant 20.
To be developed, the projection parts of the first ink pattern 41 and the second ink pattern 51 in the reference plane 2 are overlapped, the light at the illuminant 20 is strongest, the light transmittance of the overlapped area is weaker due to the overlapping of the two layers of ink patterns (the first ink pattern 41 and the second ink pattern 51), the light is weaker the farther away from the illuminant 20, the light transmittance of the non-overlapped part of the projection of the first ink pattern 41 and the projection of the second ink pattern 51 is stronger than that of the overlapped area, when the backlight module 1 is applied to a MiniLED display device, due to the existence of a seam, a dark area appears at the position corresponding to the display panel 3, a gradual change effect is realized through the overlapping of the two layers of ink patterns (the first ink pattern 41 and the second ink pattern 51), the intensity of light at the center of the illuminant 20 is weakened, so that a certain light intensity equalization effect can be achieved, and the difference between the light intensity at the seam and the light intensity at the center of the illuminant 20 is prevented from being larger, the brightness unevenness of the MiniLED display device can be improved, the MiniLED display device has a better display effect, the thickness of the diffusion plate 30 can be reduced correspondingly, the light mixing distance is shortened, and the MiniLED display device can be integrally reduced. The gradual change effect is realized through the superposition of two layers of ink patterns (the first ink pattern 41 and the second ink pattern 51), the light transmission of the area opposite to the luminous body 20 is weaker, the shielding performance is stronger, the light transmission of the area gradually far away from the luminous body 20 is stronger, the shielding performance is weaker, when in printing, the first ink pattern 41 can be printed on the first optical film layer 40 and the second ink pattern 51 can be printed on the second optical film layer 50 respectively, the gradual change shielding effect is realized through the superposition on the MiniLED display device, and the printing process is simplified.
It is understood that the first ink pattern 41 may be disposed on a side of the first optical film layer 40 close to the light emitter 20, or disposed on a side of the first optical film layer 40 close to the second optical film layer 50, and similarly, the second ink pattern 51 may be disposed on a side of the second optical film layer 50 close to the light emitter 20, or disposed on a side of the second optical film layer 50 away from the light emitter 20, which do not affect the achievement of the effect.
For example, in some embodiments, a side of the first optical film layer 40 close to the light emitter 20 is provided with a first ink pattern 41, and a side of the second optical film layer 50 close to the light emitter 20 is provided with a second ink pattern 51; in some embodiments, a side of the first optical film layer 40 away from the light emitter 20 is provided with a first ink pattern 41, and a side of the second optical film layer 50 close to the light emitter 20 is provided with a second ink pattern 51; in some embodiments, a side of the first optical film layer 40 away from the light emitter 20 is provided with a first ink pattern 41, and a side of the second optical film layer 50 away from the light emitter 20 is provided with a second ink pattern 51.
In other embodiments, the first optical film layer 40 is provided with the first ink patterns 41 on the side close to the illuminant 20, and the second optical film layer 50 is provided with the second ink patterns 51 on the side far from the illuminant 20, for this arrangement, in some simple variants, the first optical film layer 40 and the second optical film layer 50 can be combined together in advance to form a composite optical film layer, and then the first ink patterns 41 and the second ink patterns 51 can be provided on the two opposite sides of the composite optical film layer, respectively.
According to the backlight module 1 of the embodiment of the invention, when the backlight module 1 is applied to the MiniLED display device, the brightness unevenness of the MiniLED display device can be improved, the dark line effect at the abutted seam is reduced, the MiniLED display device has a better display effect, the thickness of the diffusion plate 30 can be correspondingly reduced, the light mixing distance is shortened, the MiniLED display device can be integrally reduced, and the advantage of simple printing process of the ink patterns (the first ink pattern 41 and the second ink pattern 51) is achieved.
According to the backlight module 1 of the embodiment of the invention, the central axis of the first ink pattern 41 and the central axis of the second ink pattern 51 are both coincident with the central axis of the light emitter 20, and the color of the first ink pattern 41 and the color of the second ink pattern 51 are gradually lighter along the direction gradually departing from the central axis of the light emitter 20.
The light of the color corresponds to different light transmittances, the darker the color, the weaker the light transmittance, the lighter the color, the stronger the light transmittance, both the central axis of the first ink pattern 41 and the central axis of the second ink pattern 51 coincide with the central axis of the light emitter 20, the color of the first ink pattern 41 gradually becomes lighter in a direction gradually away from the central axis of the first ink pattern 41, and the color of the second ink pattern 51 gradually becomes lighter in a direction gradually away from the central axis of the second ink pattern 51. So set up and to make first printing ink pattern 41 and second printing ink pattern 51 form the different region of more color depth after the projection stack, and make along with keeping away from the direction of luminous body 20 central axis gradually, through the gradual change nature and the stack of first printing ink pattern 41 and second printing ink pattern 51 all self, the quantity in the different region of luminousness that can greatly increased the projection, thereby make first printing ink pattern 41 and second printing ink pattern 51 more meticulous to the shielding rate regulation of luminous body 20 light, thereby make miniLED display device's display effect better.
Alternatively, the first ink pattern 41 and the second ink pattern 51 are both centrosymmetric patterns. Thereby make the pattern that forms after the projection of first printing ink pattern 41 and the projection stack of second printing ink pattern 51 more regular, gradual change effect better, along with the direction of skew luminous body 20 the central axis gradually, the luminousness after first optics rete 40 and the stack of second optics rete 50 can be more stable even change in certain interval to make mixed light effect better, make miniLED display device's bright and dark show more and tend to unanimity.
Alternatively, the first ink pattern 41 includes one of a circle, an ellipse, a square, and a rectangle, and the second ink pattern 51 includes one of a circle, an ellipse, a square, and a rectangle, so that the printing process can be simplified. The first ink pattern 41 may be printed on the first optical film layer 40 and the second ink pattern 51 may be printed on the second optical film layer 50 by a screen printing process, a letterpress printing process, or the like.
In some embodiments, the shape of the first ink pattern 41 and the shape of the second ink pattern 51 may be the same or different, for example, as shown in fig. 9 and 10, the first ink pattern 41 is a circle, and the second ink pattern 51 is a square; as shown in fig. 3 to 5, the first ink pattern 41 has an oval shape, and the second ink pattern 51 has an oval shape; the first ink pattern 41 is rectangular, and the second ink pattern 51 is rectangular; the first ink pattern 41 is circular and the second ink pattern 51 is circular. Among them, it is preferable that the shape of the first ink pattern 41 and the shape of the second ink pattern 51 are the same, and the present application is not limited.
On the premise that the shape of the first ink pattern 41 and the shape of the second ink pattern 51 are the same, the size of the first ink pattern 41 and the size of the second ink pattern 51 may be the same or different.
As shown in fig. 6 and 7, optionally, the first ink pattern 41 is overlapped with the second ink pattern 51 after being rotated by a certain angle with the central axis thereof as the rotation center, so that the projections of the first ink pattern 41 and the second ink pattern 51 in the same size and shape do not completely overlap, and thus, the regions with different depths of the patterns formed after the projection of the first ink pattern 41 and the projection of the second ink pattern 51 are overlapped can be further more regular, and the increasing trend curve of the light transmittance is overlapped with the actual trend of the light intensity of the illuminant 20 along the direction gradually away from the central axis of the illuminant 20, so that the light projected on the MiniLED display device can be more consistent.
As shown in fig. 6 and 7, optionally, the projections of the first ink pattern 41 and the second ink pattern 51 in the reference plane 2 together constitute a figure that is symmetrical with respect to both the X-axis and the Y-axis. This can further make the pattern formed after the projection of the first ink pattern 41 and the projection of the second ink pattern 51 are superimposed more regular.
The "angle" here is related to the shape of the first ink pattern 41 and the second ink pattern 51. For example, the first ink pattern 41 and the second ink pattern 51 are squares having the same size, and the first ink pattern 41 may be overlapped with the second ink pattern 51 by rotating 45 °. Or, for example, the first ink pattern 41 and the second ink pattern 51 are both oval with the same size, and the first ink pattern 41 can be overlapped with the second ink pattern 51 by rotating 90 °.
According to the backlight module 1 of the embodiment of the invention, each of the first ink pattern 41 and the second ink pattern 51 includes the first coloring area a and the plurality of second coloring areas b located at the center, the first coloring area a and the second coloring areas b are both centrosymmetric patterns, the plurality of second coloring areas b gradually surround the first coloring area a, and the color depth of the plurality of second coloring areas b gradually decreases along the direction gradually away from the first coloring area a, so that the light transmittance of the first ink pattern 41 and the second ink pattern 51 gradually changes through the areas (the first coloring area a and the second coloring area b) with different depths, and the light transmittance can be changed only by changing the number of times of printing in different areas during printing, thereby greatly simplifying the manufacturing process and the printing difficulty, and better controlling the consistency of an actual product and the processing requirement. The center axis of the first colored region a and the center axes of the plurality of second colored regions b coincide.
It should be noted that, in some embodiments, the first ink pattern 41 and the second ink pattern 51 each include a first coloring area a and the same number of second coloring areas b, and in other embodiments, the first ink pattern 41 and the second ink pattern 51 include a first coloring area a and a different number of second coloring areas b, which is not limited in this application.
Optionally, the plurality of second coloring regions b are all completely continuous regions which extend along the circumferential direction and can be connected end to end, so that the printing process can be further simplified.
For example, the number of the second coloring areas b is 3, and the second coloring areas b are divided into a first sub area, a second sub area, and a third sub area, which are sequentially increased in color shade, and when printing is performed, printing is performed once or more times on all areas within the outer peripheral outline of the first sub area, that is, printing of the pattern color shade of the first sub area is completed, printing is performed once or more times on all areas within the outer peripheral outline of the second sub area, that is, printing of the pattern color shade of the second sub area is completed, printing is performed once or more times on all areas within the outer peripheral outline of the third sub area, that is, printing of the pattern color shade of the third sub area is completed, and printing is performed once or more times on the first coloring area a in the center, that is, printing of the first ink pattern 41 is completed.
According to the backlight module 1 of the embodiment of the invention, the first ink pattern 41 and the second ink pattern 51 are made by gray ink printing. The shading effect of the gray ink on light is better, the gray change of different shades is more, and the gradual change effect of printing is better.
According to the backlight module 1 of the embodiment of the invention, two adjacent circuit substrates 10 define a seam, and a reflective material is coated at the seam. The dark lines at the joints are further reduced through the reflective materials, so that the display effect is improved. The reflecting material is white or gray reflecting paint with high reflecting degree.
According to the backlight module 1 of the embodiment of the invention, the first optical film layer 40 at least includes one of a diffusion sheet, a prism sheet and a quantum dot film, and the second optical film layer 50 at least includes one of a diffusion sheet, a prism sheet and a quantum dot film. The diffusion sheet can shield light, the prism sheet can increase the brightness of the light, and the quantum dot film can enable the light to become white light.
It is understood that the first optical film layer 40 and the second optical film layer 50 may be the same kind or different kinds, and may be selectively disposed according to the requirement. For example, in some embodiments, the first optical film layer 40 is a diffuser sheet, and the second optical film layer 50 is a prism sheet; in other embodiments, the first optical film 40 is a prism sheet, and the second optical film 50 is also a prism sheet, but the two prism sheets have different tilt angles.
The first optical film layer 40 may be a composite film including one of a diffusion sheet, a prism sheet and a quantum dot film or at least two of the diffusion sheet, the prism sheet and the quantum dot film; the second optical film layer 50 may be a composite film including one of a diffusion sheet, a prism sheet, and a quantum dot film or at least two of the diffusion sheet, the prism sheet, and the quantum dot film.
The MiniLED display device according to the embodiment of the invention comprises: shell and display panel 3, the shell is connected with display panel 3 and is injectd the installation cavity jointly, and foretell backlight unit 1 is located the installation cavity and is range upon range of the setting with display panel 3, and display panel 3 is located backlight unit 1's light-emitting side.
According to the MiniLED display device of the embodiment of the invention, the brightness of the display pattern is more uniform, the display effect is better, the thickness of the diffusion plate 30 can be correspondingly reduced, the light mixing distance is shortened, the MiniLED display device can be integrally reduced, and meanwhile, the MiniLED display device has the advantage that the printing process of the ink patterns (the first ink pattern 41 and the second ink pattern 51) is simple.
In some embodiments, the specific structure of the display panel 3 is set as follows: a lower polarizer 60, a tft (thin Film transistor) substrate 70, a cf (color filter) substrate 80, and an upper polarizer 90, which are sequentially stacked from upstream to downstream in the light emitting direction.
The first embodiment is as follows:
as shown in fig. 3 and 4, the first optical film layer 40 is provided with a first ink pattern 41, as shown in fig. 5, the second optical film layer 50 is provided with a second ink pattern 51, a central axis of the first ink pattern 41 and a central axis of the second ink pattern 51 are both overlapped with a central axis of the light emitter 20, the first ink pattern 41 and the second ink pattern 51 are both ellipses with the same size and the same shape, a long axis of the first ink pattern 41 is parallel to the Y-axis direction, a long axis of the second ink pattern 51 is parallel to the X-axis direction, and the first ink pattern 41 can be overlapped with the second ink pattern 51 by rotating 90 °. The first and second ink patterns 41 and 51 each include a first colored region a and two second colored regions b. As shown in fig. 6 and 7, at least three regions of different transmittances are formed after the superposition of the projections of the reference plane 2, and each region is approximately circular or annular, similar to the emitting direction of the light of the luminous body 20. As shown in fig. 8, the overlapped area where the first ink pattern 41 and the second ink pattern 51 are projected to coincide includes three areas with different depths, namely, a first area 202, a second area 204 and a third area 206, and the depths of the first area 202, the second area 204 and the third area 206 are sequentially decreased.
Example two:
as shown in fig. 9, the first optical film layer 40 is provided with a first ink pattern 41, as shown in fig. 10, the second optical film layer 50 is provided with a second ink pattern 51, a central axis of the first ink pattern 41 and a central axis of the second ink pattern 51 both coincide with a central axis of the light emitter 20, the first ink pattern 41 and the second ink pattern 51 are circular with the same shape but different sizes, the size of the first ink pattern 41 is larger than that of the second ink pattern 51, and accordingly, the first ink pattern 41 and the second ink pattern 51 each include a first colored region a and the same number of second colored regions b. The first colored region a, and the second colored region b of the first ink pattern 41 are larger in area than the corresponding first colored region a and the second colored region b of the second ink pattern 51, and when the reference plane 2 is projected and superimposed, a larger number of regions of different transmittances can be formed. When the light mixing effect of the first ink pattern 41 and the second ink pattern 51 on the light emitting body 20 is gradually optimized and adjusted, only the first ink pattern 41 needs to be adjusted or the second ink pattern 51 needs to be adjusted, so that the test design process can be simplified when the backlight module 1 is adapted to different backlight modules.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, 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 otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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 do not necessarily 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.
Claims (10)
1. A backlight module includes: the backlight module comprises a back plate, a plurality of circuit substrates, a plurality of luminous bodies, a diffusion plate, a first optical film layer and a second optical film layer, wherein the back plate, the plurality of circuit substrates are sequentially stacked from upstream to downstream along a light ray outgoing direction, the plurality of luminous bodies are arranged on each circuit substrate in an array mode, the diffusion plate, the first optical film layer and the second optical film layer are arranged on the first optical film layer, the positions of the first optical film layer, corresponding to the luminous bodies, are provided with first ink patterns, the positions of the second optical film layer, corresponding to the luminous bodies, are provided with second ink patterns, the projection parts of the first ink patterns and the second ink patterns, corresponding to the luminous bodies, in a reference plane are overlapped to form an overlapping region, the overlapping region is opposite to the corresponding luminous bodies, and the reference plane is parallel to the first optical film layer and/or the second optical film layer.
2. The backlight module according to claim 1, wherein the central axis of the first ink pattern and the central axis of the second ink pattern are coincident with the central axis of the light emitter, and the color of the first ink pattern and the color of the second ink pattern become gradually lighter along a direction gradually away from the central axis of the light emitter.
3. The backlight module of claim 2, wherein the first ink pattern and the second ink pattern are both centrosymmetric patterns.
4. The backlight module according to claim 3, wherein the first ink pattern comprises one of a circle, an ellipse, a square and a rectangle, and the second ink pattern comprises one of a circle, an ellipse, a square and a rectangle.
5. The backlight module as claimed in claim 3, wherein the first ink pattern is rotated by a certain angle with a central axis thereof as a rotation center to coincide with the second ink pattern.
6. The backlight module according to claim 5, wherein the projections of the first ink pattern and the second ink pattern in the reference plane together form a figure that is symmetrical with respect to both the X-axis and the Y-axis.
7. The backlight module according to any one of claims 1-5, wherein the first and second ink patterns each comprise a first colored region located at the center and a plurality of second colored regions, the first and second colored regions are each in a centrosymmetric pattern, the plurality of second colored regions gradually surround the first colored region, the plurality of second colored regions gradually decrease in color shade along a direction gradually away from the first colored region, and the plurality of second colored regions are each a complete continuous region which extends along the circumferential direction and can be connected end to end.
8. The backlight module according to claim 1, wherein two adjacent circuit substrates define a seam, and a light reflecting material is coated at the seam.
9. The backlight module as claimed in claim 8, wherein the first optical film layer comprises at least one of a diffuser, a prism and a quantum dot film, and the second optical film layer comprises at least one of a diffuser, a prism and a quantum dot film.
10. A MiniLED display device, comprising: the backlight module comprises a shell and a display panel, wherein the shell is connected with the display panel to jointly define a mounting cavity, the backlight module is arranged in the mounting cavity and is stacked with the display panel according to any one of claims 1 to 9, and the display panel is positioned on the light emitting side of the backlight module.
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| CN115325514A (en) * | 2022-10-12 | 2022-11-11 | 惠科股份有限公司 | Backlight module and display device |
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