CN107422529A - Back light unit and the display device for including it - Google Patents
Back light unit and the display device for including it Download PDFInfo
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- CN107422529A CN107422529A CN201710660397.0A CN201710660397A CN107422529A CN 107422529 A CN107422529 A CN 107422529A CN 201710660397 A CN201710660397 A CN 201710660397A CN 107422529 A CN107422529 A CN 107422529A
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- back light
- light unit
- led chip
- miniature led
- wavelength conversion
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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
-
- 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
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
Abstract
This application provides a kind of back light unit and the display device for including it.The back light unit includes substrate and Wavelength conversion film, and the Wavelength conversion film includes fluorophor, and Wavelength conversion film is arranged at the top of substrate, and the back light unit also includes：The miniature LED chip array being arranged on substrate, miniature LED chip array includes multiple miniature LED chips, and the cross-sectional area of each miniature LED chip is less than or equal to 1mm2.Above-mentioned back light unit, because miniature LED chip array cross-sectional area is small, therefore more LED chips can be arranged under same substrate area, so as to which the brightness of backlight assembly is high and brightness is uniformly dispersed, and the thickness of thin of miniature LED chip array, secondary it need not match somebody with somebody mirror, so as to which direct-type backlight unit general thickness can decline, in addition, miniature LED chip has lower driving current, thus electric energy is converted into that heat energy is also few, i.e. energy-conservation, heat production can also improve the life-span of back light unit less.
Description
Technical field
The application is related to display field, in particular to a kind of back light unit and the display device for including it.
Background technology
Traditional direct-type backlight sets the LED chip of multiple normal sizes in unit substrate, due to the hair of LED chip in itself
Light characteristic is, it is necessary to carry out the secondary distribution of light by lens, so as to applied in display unit.But by lens mixed light away from
From limitation (according to current technology, 12mm can be accomplished apart from maximum, it is difficult to continue to reduce), the thickness of traditional straight-down negative unit compared with
Greatly, existing market mainstream demand is not met, is generally used in giant display, is not used in miniscope.Traditional side enters
Although formula backlight can accomplish in miniscope, limited by structure, super brightness, wherein quantum dot can not be accomplished
Also there is the problem of leakage blue light in side entering type unit, so as to cause glow color uneven.Due to back light unit edge it is luminous
Uniformity (including brightness and colourity) is inconsistent with the uniformity of luminance of intermediate region, and usual edge will be covered by covering glue
Fall, lead to not realize narrow frame or Rimless.
The content of the invention
The main purpose of the application is to provide a kind of back light unit and includes its display device, to solve prior art
In direct-type backlight unit thickness is thick and the problem of uniformity of luminance difference.
To achieve these goals, according to the one side of the application, there is provided a kind of back light unit, the back light unit bag
Include：Substrate and Wavelength conversion film, Wavelength conversion film includes fluorophor, and Wavelength conversion film is arranged at the top of substrate, the backlight
Unit also includes the miniature LED chip array being arranged on substrate, and miniature LED chip array includes multiple miniature LED chips, and
The cross-sectional area of each miniature LED chip is less than or equal to 1mm2。
Further, above-mentioned substrate has multiple hollow-out parts or concave part；Each miniature LED chip is embedded in the hollow-out parts of substrate
Or in concave part.
Further, above-mentioned back light unit also includes the cup with opening, and above-mentioned cup is from the edge of substrate toward wavelength
The direction of conversion film extends to be formed, and Wavelength conversion film is arranged at the top of cup.
Further, the surface of above-mentioned substrate has reflective membrane.
Further, the surface of above-mentioned cup has reflective membrane.
Further, above-mentioned back light unit also includes diffusion barrier, and diffusion barrier is arranged between cup and Wavelength conversion film.
Further, above-mentioned back light unit also includes glue-line, and glue-line is arranged at around above-mentioned miniature LED chip array, and
It is arranged at below above-mentioned Wavelength conversion film.
Further, above-mentioned back light unit also includes diffusion barrier, and above-mentioned diffusion barrier is arranged at above-mentioned glue-line and above-mentioned wavelength
Between changing film, or above-mentioned diffusion barrier is arranged above above-mentioned Wavelength conversion film.
Further, above-mentioned miniature LED chip array launches the emission spectrum of single color bands, it is preferable that above-mentioned list
Individual color is blueness.
Further, the length of two neighboring miniature LED chip or the spacing of width are 1 μm~1mm.
Further, distribution density of the miniature LED chip on substrate is more than or equal to 50/cm2。
Further, above-mentioned fluorophor is quantum dot.
Further, above-mentioned back light unit also includes the circuit for driving each miniature LED chip independently to light.
Further, above-mentioned substrate to above-mentioned Wavelength conversion film 0.1~6mm of altitude range.
Further, above-mentioned back light unit also includes brightness enhancement film, and brightness enhancement film is arranged at the top of Wavelength conversion film.
According to the another aspect of the application, there is provided a kind of display device, the display device include above-mentioned back light unit.
Above-mentioned back light unit is compared with conventional backlight unit, identical because the cross-sectional area of miniature LED chip array is small
More miniature LED chips can be arranged under Substrate Area, so as to which the brightness of backlight assembly is high and brightness is uniformly dispersed, Wu Xushe
Put it is secondary match somebody with somebody mirror (it has thickness), and the thickness of miniature LED chip array can do it is thin, so as to which direct-type backlight unit is overall
Thickness can decline.In addition, miniature LED chip has lower driving current, thus electric energy is converted into heat energy also less, that is, saves
Energy, heat production can also improve the life-span of back light unit less.In addition, compared to side entrance back unit, direct-type backlight unit does not have
Leakage problem.Using the same thin, energy-conservation of the display device of the back light unit, long lifespan, brightness is high, chroma luminance homogeneity is good.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not form the improper restriction to the application.In the accompanying drawings：
Fig. 1 shows the miniature LED chip of the substrate of the back light unit provided according to a preferred embodiment of the present application 1
The schematic diagram of array；
Fig. 2 shows the structural representation of the back light unit provided according to a preferred embodiment of the present application 1；
Fig. 3 shows the structural representation of the back light unit provided according to a kind of comparative example 1 of prior art；
Fig. 4 shows the structural representation of the back light unit provided according to the application preferred embodiment 2~4；And
Fig. 5 shows the structural representation of the back light unit provided according to a kind of preferred embodiment 5 of the application.
In figure：1st, miniature LED chip；2nd, diffusion barrier；3rd, lens；4th, Wavelength conversion film；5th, common LED chip；6th, substrate；
7th, glue-line.
Embodiment
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, operation, device, component and/or combinations thereof." top ", " lower section " include contact and set
Or non-contact setting situation.
It should be noted that in the case where not conflicting, the feature in embodiment in the application can be mutually combined.Under
Face describes the application in detail by refer to the attached drawing and in conjunction with the embodiments.
As described by background technology, in the prior art it is poor to there is thickness thickness and uniformity of luminance partially in direct-type backlight unit
The problem of, in order to solve the problem, in the application one kind, typically embodiments, provides a kind of back light unit, the backlight list
Member includes substrate and Wavelength conversion film, and Wavelength conversion film includes fluorophor, and Wavelength conversion film is arranged at the top of substrate, the back of the body
Light unit also includes the miniature LED chip array being arranged on substrate, and miniature LED chip array includes multiple miniature LED chips,
And the areal extent of the cross section of each miniature LED chip is less than or equal to 1mm2。
Cross section refers to the cross section parallel to substrate direction, and cross section is in thickness direction without area discrepancy.Miniature LED core
The cross section of piece can be rectangle, circle or polygon.The thickness (or height) of each miniature LED chip is according to final
The demand of product can be adjusted.Array refers to each LED chip according to certain regular regularly arrangement mode, such as concentric circles,
The similar fashions such as array.Each miniature LED chip in the application does not repel rational encapsulation, and rational encapsulating structure can increase
Size, but must be carried out on the premise of technique effect is met.
Direct-type backlight unit with said structure, because miniature LED chip array cross-sectional area is small therefore identical
More miniature LED chips can be arranged under Substrate Area, so as to which brightness is high, colourity, brightness uniformity are good, secondary without adding
Luminous intensity distribution eyeglass；And the thickness of miniature LED chip can do small, can decline so as to direct-type backlight unit general thickness.In addition,
Miniature LED chip has a lower driving current, thus electric energy is converted into that heat energy is also small, i.e. energy-conservation, heat production can also improve the back of the body less
The life-span of light unit.In addition, compared to side entrance back unit, direct-type backlight unit does not have edge leakage problem.The application
Scheme due to evenness degree and luminance uniformity it is excellent, therefore can realize that narrow frame, or even Rimless are shown.
In some embodiments of the present application, miniature LED chip is cuboid, is considered from miniature LED chip manufacturing cost,
Miniature LED chip can use length and width scope in 0.1mm~0.5mm to reduce cost.In the another of the application
In a little embodiments, the scope of the cross-sectional area of miniature LED chip is less than or equal to 0.5mm2, it is highly preferred that miniature LED chip
The scope of cross-sectional area is less than or equal to 0.05mm2。
In some embodiments of the present application, substrate has multiple hollow-out parts or multiple concave parts；Each miniature LED chip battle array
Row set drive circuit in the hollow-out parts of substrate or concave part, so as to convenient.
In some embodiments of the present application, back light unit includes having opening cup, and the cup is past by edges of substrate
The direction of Wavelength conversion film extends to be formed, and Wavelength conversion film is arranged at the top of cup, so as to diaphragm above powerful support.Cup
Body includes side wall and substrate.Preferably, the side section of cup is isosceles inverted trapezoidal, and the angle close to substrate is trapezoidal base angle, etc.
The base angle of waist inverted trapezoidal is more than or equal to 135 degree, less than 180 degree.Back light unit has cup body structure large-sized in being generally used for
In display.The design without cup body structure of back light unit can be used in small-size display, because small-size display pair
The requirement of minimal thickness is higher.
In some embodiments of the present application, substrate or cup surface have reflective membrane so that miniature LED chip is sent
Light reflected by reflective membrane, so as to improve the utilization rate of light, preferably the reflectivity of reflective membrane is more than or equal to 85%.Reflection
Property film can only be covered in region shared by non-miniature LED chip array.
In some embodiments of the present application, back light unit also includes diffusion barrier, and diffusion barrier is arranged at cup and wavelength turns
Change between film, or diffusion barrier is arranged above above-mentioned Wavelength conversion film, so as to which light is more uniformly transferred into wavelength convert
Film.It is preferred that the thickness of the diffusion barrier is less than or equal to 1mm, diffusion barrier can include diffusion particle.
In some embodiments of the present application, Wavelength conversion film or diffusion barrier have buckle structure, have on cup relative
The structure answered is used to fix diaphragm (Wavelength conversion film and/or diffusion barrier).
In some embodiments of the present application, back light unit also includes glue-line, and the glue-line is arranged at above-mentioned miniature LED chip
Around array, and it is arranged at below Wavelength conversion film.It is preferred that the thickness of the glue-line is 0.05~0.5mm.Glue-line plays fixed LED
The effect of chip, and be beneficial to flatly set other films.When contact sets other films on glue-line, before glue-line can be solidification
State with stickiness or solidification finish the state of no stickiness.It is preferred that glue-line is the state of no stickiness, now
The film layer directly contacted can have the gap of self-assembling formation, and light can transmit to other again after being emitted from glue-line by air layer
Diaphragm, light are transferred to optically thinner medium from optically denser medium, and refraction angle becomes big, is emitted, makes from intermediate region so as to reduce a part of light
It is more uniform to obtain exiting surface light extraction, that is, reduces diaphragm exiting surface corresponding to each miniature LED chip and occurs surrounding single miniature LED
Chip area is the phenomenon in half-light region.
In some embodiments of the present application, back light unit also includes diffusion barrier, and diffusion barrier is arranged at above-mentioned glue-line and ripple
Between long conversion film.When miniature LED chip arrangement density is less than some scope, each miniature LED chip is in Wavelength conversion film
The correspondence position of exiting surface there may be the dark situation in middle bright periphery, by adding diffusion barrier so that by light more uniformly
It is transferred to Wavelength conversion film.
In the preferred embodiment of the application, miniature LED chip array is designed to launch the hair of single color bands
Spectrum is penetrated, so as to which more efficiently excitation wavelength conversion film lights, the single color bands can be understood as ripple corresponding to monochromatic light
Segment limit, it is preferable that the single color is blueness, i.e., miniature LED chip is miniature blue-ray LED.
In some embodiments of the present application, wherein the length of each miniature LED chip adjacent in miniature LED chip array
The spacing of degree and/or width is 1 μm~1mm.Appropriate spacing is kept to use relatively few number of miniature LED chip
Luma target is realized, reduces cost.Such as rectangular body minisize LED chip, when use length and width scope is in 0.1~0.5mm
When, the spacing size in the length and width direction of adjacent miniature LED chip could be arranged to 0.05~0.25mm.
In some embodiments of the present application, in the miniature LED chip array distribution density of miniature LED chip be more than
Equal to 50/square centimeter.As technology develops, miniature LED chip can be made very small, then its distribution density can be more
Height, miniature LED chip is smaller, more favourable to brightness uniformity, energy-conservation, thickness aspect.The shape of miniature LED chip is not spy
Do not limit, circular, rectangle, just polygonal, aforementioned shapes facilitate miniature LED chip array arrangement to set.
In some embodiments of the present application, wherein fluorophor can be quantum dot.Quantum dot can realize that high colour gamut shows
Show, fluorophor can also be fluorescent material, fluorescent material polymer beads, quanta polymer particle etc..It is preferable in the application
In embodiment, wherein Wavelength conversion film has water oxygen barrier, so as to extend the service life of Wavelength conversion film.
In some embodiments of the present application, back light unit also includes the electricity for driving each miniature LED chip independently to light
Road., can if Wavelength conversion film has the flaw of a small amount of non-uniform light in the case that each miniature LED chip independently lights
To control independent circuit to adjust the brightness of each miniature LED chip corresponding to flaw location, so as to realize it is overall it is luminous
It is even.
In some embodiments of the present application, 0.1~6mm of altitude range of substrate to Wavelength conversion film, it is preferable that can be with
For 0.1~1mm.The thickness range can realize that back light unit is applied in smart mobile phone or other ultrathin displays.
In the preferred embodiment of the application, back light unit also includes brightness enhancement film, and brightness enhancement film is arranged at Wavelength conversion film
Top, brightness is further improved, so as to more saving.
In another typical embodiment of the application, there is provided a kind of display device, the display device include above-mentioned
Back light unit.So as to have the advantages that thin, energy-conservation, long lifespan, brightness height, colourity and brightness uniformity.
In order that the technical scheme of the application can clearly be understood by obtaining those skilled in the art, below with reference to tool
The embodiment of body explains the technical scheme of the application with comparative example.
Embodiment 1
As shown in Fig. 2 back light unit includes substrate 6 (area 70cm*40cm), Wavelength conversion film 4, cup；Cup is
The direction of the edge of substrate 6 toward Wavelength conversion film 4 extends what is formed, and it has opening, and side section is isosceles inverted trapezoidal (base angle
135 degree), cup has opening, side wall and substrate 6, and reflective membrane is provided with (in Fig. 2 in the side wall and the inner surface of substrate 6 of cup
It is not shown) substrate 6 has multiple concave parts (not shown in Fig. 2), and back light unit also includes miniature LED chip array, and this is miniature
LED chip array is (Fig. 1 is only schematic diagram, and the miniature LED chip of actual quantity is not shown) as shown in Figure 1, the miniature LED chip
Array includes multiple miniature LED chips 1 in matrix arrangement, and miniature LED chip array arranges individual miniature including 2660 row * 7000
LED chip, in rectangular-shape, its a height of 0.05mm*0.1mm*0.05mm of long wide * of *, the emission wavelength range of miniature LED chip 1
For 440-465nm；The spacing between each miniature LED chip 1 with length and width is 0.05mm, and with independent
Control circuit；The distribution density of miniature LED chip 1 is 6650/square centimeter, and in the concave part of substrate.
Back light unit also includes quantum dot Wavelength conversion film 4, and the Wavelength conversion film 4 is arranged at the top of cup, quantum dot
Wavelength conversion film 4 includes the red green sub- point of two amounts, and Wavelength conversion film 4 is arranged in the opening of cup.Cup substrate is to cup
The distance between opening is 0.2mm；As shown in Fig. 2 the back light unit is also arranged at cup and Wavelength conversion film including diffusion barrier 2
Between 4.
Embodiment 2
As shown in figure 4, back light unit includes substrate 6 (area 15cm*8cm), Wavelength conversion film 4, substrate 6 has multiple
Concave part (not shown in Fig. 4), back light unit also include miniature LED chip array, and the miniature LED chip array is as shown in Figure 1
(Fig. 1 is only schematic diagram, and the miniature LED chip of actual quantity is not shown), the miniature LED chip array include multiple in matrix row
The miniature LED chip 1 of cloth, miniature LED chip array arrange a miniature LED chip including 1000 row * 800, in rectangular-shape, its
The a height of 0.05mm*0.1mm*0.05mm of the long wide * of *, the emission wavelength range of miniature LED chip 1 is 440-465nm；It is each miniature
The spacing between LED chip 1 with length and width is 0.05mm, and has independent control circuit；Miniature LED core
The distribution density of piece 1 is 6666/square centimeter, and in the concave part of substrate.
Back light unit also includes quantum dot Wavelength conversion film 4, and quantum dot Wavelength conversion film 4 is same as Example 1, only size
Difference, and quantum dot Wavelength conversion film is flatly arranged on miniature LED chip array by 0.3mm glue-line 7.
Embodiment 3
Miniature LED chip array arranges a miniature LED chip 1 including 250 row * 266, a height of in rectangular-shape, its long wide * of *
0.1mm*0.4mm*0.1mm, there is spacing 0.2mm between each miniature LED chip 1, the distribution density of miniature LED chip 1 is
554/square centimeter, other are the same as embodiment 2.
Embodiment 4
Miniature LED chip array arranges a miniature LED chip 1 including 100 row * 80, a height of in rectangular-shape, its long wide * of *
0.5mm*1mm*0.3mm, there is spacing 0.5mm, the distribution density of miniature LED chip 1 is 67 between each miniature LED chip 1
Individual/square centimeter, other are the same as embodiment 2.
Embodiment 5
As shown in figure 5, diffusion barrier 2 is flatly arranged on the miniature array of LED chip 1 by 0.3mm glue-line 7, diffusion
For film between glue-line 7 and quantum dot Wavelength conversion film 4, diffusion film thickness is 0.3mm.Other are the same as embodiment 4.
Comparative example 1
As shown in figure 3, back light unit includes substrate 6, the edge of the substrate 6 extends toward the direction of above-mentioned Wavelength conversion film 4
The cup with opening is formed, the cup is as shown in figure 3, from side view 3 it can be seen that cup is in isosceles inverted trapezoidal (base angle 135
Degree) cup, cup has opening, side wall and a substrate 6, and substrate 6 has multiple concave parts for being used to set common LED chip,
Reflective membrane is provided with the side wall inner surfaces of cup, the inner surface of the substrate of cup sets and is also equipped with reflective membrane, reflective membrane
Reflectivity with embodiment 1；Substrate Area is the same as embodiment 1.
The back light unit also includes the array of common LED chip 5, and the device array of common LED chip 5 arranges individual general including 4 row * 7
Logical LED chip 5, its a height of 3mm*3mm*1mm of long wide * of *；The distribution density of common LED chip 5 is 0.01/square centimeter；Each
Common LED chip 5 is respectively provided with the cover of secondary light-distribution lens 3 and set, and the emission wavelength range of common LED chip 5 is 440-465nm, is located at
On the substrate 6 of back light unit；With quantum dot Wavelength conversion film 4, quantum dot Wavelength conversion film 4 is same as Example 1, and wavelength turns
Film 4 is changed to be arranged in opening.It is 15mm that cup substrate 6, which arrives the distance between cup opening,；The back light unit also includes diffusion barrier 2
It is arranged between cup and Wavelength conversion film 4, as shown in Figure 3.
The uniformity of chromaticity of the back light unit provided above-described embodiment 1~5 and comparative example 1 and brightness are tested, CIE
(x, y) is chromaticity coordinate value, equidistant 3 × 3 points of selection, CIE-x deviations=CIE-x maximum-CIE-x minimum values,
CIE-y deviations=CIE-y maximum-CIE-y minimum values, CIE-x deviations and CIE-y deviations are smaller, show the backlight
The uniformity of chromaticity of unit is better.The brightness maxima in the point of brightness minimum value/9 in the point of luminance uniformity=9, and it is bright
The degree uniformity shows that brightness is more uniform closer to 1, the CIE-x evenness degree of each embodiment lifting percentage=| (embodiment
CIE-x deviations-comparative example CIE-x deviations)/comparative example CIE-x deviations |, the CIE-y colourities of each embodiment are equal
Evenness lifting percentage=| the CIE-y of (the CIE-y deviations of CIE-y deviations-comparative example of the embodiment)/comparative example is inclined
Difference |.
The back light unit provided above-described embodiment 1~5 and comparative example 1 carries out the combination of the complete machines such as liquid crystal, then to complete machine
Aging monitors light decay curve, and aging acceleration environment is 40 DEG C, 70% relative humidity, service life is measured according to anticipation function；The back of the body
Light unit thickness is distance of the Wavelength conversion film to substrate.
Test result such as table 1 below：
Table 1
As shown in Table 1, compared with comparative example 1, CIE-x evenness degree and the CIE-y evenness degree of embodiment 1~5
There is lifting, brightness is obviously improved, luminance uniformity also has lifting, i.e., equal with preferable uniformity of chromaticity and preferable brightness
Even property, and back light unit thickness reduces obvious, service life extension.
As can be seen from the above description, the application the above embodiments realize following technique effect：
1) high life；2) high brightness；3) thickness of thin；4) brightness, uniformity of chromaticity are good, and narrow frame can be achieved and Rimless shows
Show.
The preferred embodiment of the application is the foregoing is only, is not limited to the application, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (16)
1. a kind of back light unit, including：Substrate (6) and Wavelength conversion film (4), the Wavelength conversion film (4) include fluorophor, and
The Wavelength conversion film (4) is arranged at the top of the substrate (6), it is characterised in that also includes：
The miniature LED chip array being arranged on the substrate (6), the miniature LED chip array include multiple miniature LED cores
Piece (1), and the cross-sectional area of each miniature LED chip (1) is less than or equal to 1mm2。
2. back light unit according to claim 1, it is characterised in that the substrate (6) has multiple hollow-out parts or multiple
Concave part；Each miniature LED chip (1) is in the hollow-out parts of the substrate (6) or concave part.
3. back light unit according to claim 1, it is characterised in that also include with opening cup, the cup by
The direction of edge toward the Wavelength conversion film (4) of the substrate (6) extends to be formed, and the Wavelength conversion film (4) is arranged at institute
State the top of cup.
4. back light unit according to claim 1, it is characterised in that substrate (6) surface has reflective membrane.
5. back light unit according to claim 3, it is characterised in that the cup surface has reflective membrane.
6. back light unit according to claim 3, it is characterised in that also set including diffusion barrier (2), the diffusion barrier (2)
It is placed between the cup and the Wavelength conversion film (4), or the diffusion barrier (2) is located on the Wavelength conversion film (4)
Side.
7. back light unit according to claim 1, it is characterised in that be also arranged at including glue-line (7), the glue-line (7)
Around the miniature LED chip array, and it is arranged at below the Wavelength conversion film (4).
8. back light unit according to claim 7, it is characterised in that also set including diffusion barrier (2), the diffusion barrier (2)
It is placed between the glue-line (7) and the Wavelength conversion film (4).
9. back light unit according to claim 1, it is characterised in that the miniature LED chip array launches single color
The emission spectrum of wave band, it is preferable that the single color is blueness.
10. back light unit according to claim 1, it is characterised in that the length of the two neighboring miniature LED chip (1)
The spacing of degree or width is 1 μm~1mm.
11. back light unit according to claim 1, it is characterised in that the miniature LED chip (1) is on substrate (6)
Distribution density is more than or equal to 50/cm2。
12. back light unit according to claim 1, it is characterised in that the fluorophor is quantum dot.
13. back light unit according to claim 1, it is characterised in that also include driving each miniature LED chip
(1) circuit independently to light.
14. back light unit according to claim 1, it is characterised in that the substrate (6) to the Wavelength conversion film (4)
0.1~6mm of altitude range.
15. back light unit according to claim 1, it is characterised in that be also arranged at institute including brightness enhancement film, the brightness enhancement film
State the top of Wavelength conversion film (4).
16. a kind of display device, it is characterised in that including the back light unit as any one of claim 1~15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710660397.0A CN107422529A (en) | 2017-08-04 | 2017-08-04 | Back light unit and the display device for including it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710660397.0A CN107422529A (en) | 2017-08-04 | 2017-08-04 | Back light unit and the display device for including it |
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| Publication Number | Publication Date |
|---|---|
| CN107422529A true CN107422529A (en) | 2017-12-01 |
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| CN109671365A (en) * | 2019-01-30 | 2019-04-23 | 京东方科技集团股份有限公司 | Micro-LED display base plate and preparation method thereof, display device |
| CN110275352A (en) * | 2019-06-28 | 2019-09-24 | 武汉华星光电技术有限公司 | The regulation method of backlight module and its light transmittance |
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| CN111583816A (en) * | 2020-04-01 | 2020-08-25 | 福州超晶格科技有限公司 | Assembled MiniLED quantum dot micro-crystal light-emitting panel and preparation method thereof |
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