CN107643628A - A kind of liquid crystal display device - Google Patents
A kind of liquid crystal display device Download PDFInfo
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- CN107643628A CN107643628A CN201710675141.7A CN201710675141A CN107643628A CN 107643628 A CN107643628 A CN 107643628A CN 201710675141 A CN201710675141 A CN 201710675141A CN 107643628 A CN107643628 A CN 107643628A
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Abstract
A kind of liquid crystal display device that the present patent application provides, including liquid crystal panel, the liquid crystal panel includes quantum dot colour element layer, upper polarizer, liquid crystal switch cell and the lower polarizer being cascading, and the quantum dot colour element layer includes red sub-pixel unit, green sub-pixels unit and blue subpixels unit.The display device also includes being arranged on the backlight module below the liquid crystal panel, the backlight module includes backboard and the luminescent device being arranged on the backboard, and the luminescent device includes LED and the Collimation optics being arranged on above the LED.According to the conspicuous invariant of drawing, by setting Collimation optics above LED, make beam projecting aperture increases, reduce so as to the rising angle of backlight, light realizes a certain degree of collimation outgoing, and then improves liquid crystal panel when being shown picture because of color cross-talk problem the larger pixel brought of backlight rising angle.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of liquid crystal display device.
Background technology
In a kind of new display mode of current LCD TV, traditional liquid crystal is directly replaced using quantum dot colour element layer
Colour filter in panel, mainly include red sub-pixel unit, green sub-pixels unit and blue subpixels unit, wherein, it is red
Sub-pixels unit sets red quantum dot material；Green sub-pixels unit sets green quanta point material；Blue subpixels list
Member is not provided with quanta point material or sets blue quanta point material.When Blue backlight is radiated at three kinds of pixel cells of red, green and blue
When upper, Blue backlight is directed through launching blue light in blue subpixels unit；Quanta point material in green sub-pixels unit is inhaled
Receive blue light and be converted into green glow, the quanta point material in red sub-pixel unit absorbs blue light and is converted into feux rouges.
Because quanta point material is when being stimulated transmitting fluorescence, physical conduction property and the polarization direction of light can be changed,
When being excited in particular by polarized blue light, the fluorescence of quanta point material transmitting is unpolarized state, as a result, quantum
Liquid crystal panel prepared by point material and traditional colored filter liquid crystal panel structure prepared are different, it is necessary to carry out polarizer
The adjustment of position, liquid crystal panel is set to be cascading for quantum dot colour element layer, upper polarizer, liquid crystal layer and lower polarization
Piece.
Wherein, upper polarizer, liquid crystal layer, three layers of lower polarizer, which fit together, is mainly used in the light that control passes through light
By force, quantum dot colour element layer receives exciting for varying strength light, and the color for producing different brightness is shown.The present inventor exists
Realize and find during above-mentioned liquid crystal panel, because backlight light extraction has certain dispersion angle, and upper polarizer is placed at quantum
New quantum dot panel construction between point colour element layer and liquid crystal layer, because its structure changes, can bring quantum dot
In liquid crystal panel between different pixels color crosstalk serious problems.
Color cross-talk specifically can refer to shown in Fig. 1 between pixel, exemplified by showing green sub-pixels, green sub-pixels unit
122 liquid crystal switch cells for corresponding to liquid crystal layer 111 are in the state opened, red sub-pixel unit 121 and blue subpixels list
Member 123 corresponding to liquid crystal switch cell be closed, however, backlight luminescence device 100 provide backlight rising angle compared with
Greatly, Blue backlight after lower polarizer 110, liquid crystal layer 111 are handled with upper polarizer 112, still may be used by the larger light of dispersion angle
It is irradiated at adjacent red sub-pixel unit 121 and blue subpixels unit 123, to cause red sub-pixel unit 121
Blue backlight can be received through and excite generation feux rouges, and be directed through by the light of blue subpixels unit 123, so as to
Be used in display green pixel excitation line can enter other adjacent color sub-pixels units in, when showing green doped with
Red and blueness, and then reduce excitation.Similarly, red sub-pixel and sub- blue pixel can also have asking for color cross-talk
Topic.
For color cross-talk problem between above-mentioned pixel, mainly using black matrix" between each sub-pixel (i.e. BM areas) with prevention
Light crosstalk between adjacent subpixels.In order to improve the prevention efficiency of black matrix", conventional alternative selects two methods solution：1、
Directly increase the width of black matrix" between each sub-pixel, expand black matrix" and scope is prevented to divergent rays；2nd, quantum is reduced
Upper polarizer and other substrate layer equal thickness between point colour element layer and liquid crystal layer, to reduce divergent rays in level
Direction offset distance so that offset distance so, is more beneficial for black matrix" to prevent in the range of black matrix" prevention
Light crosstalk between adjacent subpixels.
But, on the one hand, it is Display Technique common demands actually to lift display brightness, and especially resolution ratio is improving constantly
In the case of, the ratio that display pixel area accounts for viewing area constantly reduces, and causes display brightness further to reduce, thus, to carry
High display brightness then needs to increase liquid crystal panel effective display area accounting, correspondingly needs to reduce as far as possible black matrix" between pixel
Accounting, so, industry common practice is to need improved technology to reduce black matrix" size to lift display brightness；Separately
On the one hand, polarizer is usually a kind of composite film structure, and its thickness is generally higher than 100 microns, typically prepares work by improving
Skill and material further reduce its thickness, but its improvement difficulty is very big.Under normal circumstances, the width in existing conventional BM areas may be used
Reach 20 microns or less, relatively in available liquid crystal display device for the polarizer of known thickness, the BM of its existing width
Area is limited to the buffer action of adjacent pixel light, even if the structural form or the preparation technology that break through polarizer are thick to reduce it
Degree, it is also difficult to effectively solve the problems, such as the influence that polarizer gauge strips carry out color cross-talk.
The content of the invention
In order to improve, liquid crystal panel to picture when showing in the prior art, due to the larger pixel brought in backlight luminescence angle
Between color cross-talk problem, the present patent application provides a kind of liquid crystal display device.
The present invention provides a kind of liquid crystal display device, including liquid crystal panel and backlight module, wherein, the liquid crystal panel bag
Include：Liquid crystal layer, side and downside correspondingly configure upper polarizer and lower polarizer, and quantum dot color images on the liquid crystal layer
Plain layer,
The quantum dot colour element layer configuration is above the upper polarizer, and the quantum dot colour element layer includes
Several spaced multiple color sub-pixel units and the black matrix" between the sub-pixel unit；
The backlight module includes luminescent device and other backlight assemblies, and the luminescent device is used to provide the liquid crystal surface
Light needed for plate display image；
Dispersion angle φ 2 when the light of the luminescent device is incident to the liquid crystal panel, then need to meet formula
Arctan (0.5*D/H2)≤2≤arctan of φ (L/H1) requirements, wherein, D is the two neighboring luminescent device light-emitting area
Center spacing, H2 be any luminescent device light-emitting area to the distance of the liquid crystal panel lower surface, L is the black matrix
Width, H1 be the liquid crystal layer upper surface to the quantum dot colour element layer lower surface height.
Compared with prior art, the advantageous effects for the technical scheme that the embodiment of the present application is proposed include：
In a kind of liquid crystal display device that the present patent application provides, because the light of the luminescent device is incident to the liquid
Dispersion angle φ 2 during crystal panel, then need to meet formula arctan (0.5*D/H2)≤2≤arctan of φ (L/H1) requirements,
Certain limit is limited to the spans of dispersion angle φ 2, on the one hand, the span, both limited light minimum divergence angle
It is met the needs of directive liquid crystal panel lower surface glazing illuminance uniformity, directive liquid crystal panel lower surface glazing can be kept
Illuminance uniformity, on the other hand, the maximum occurrences of the dispersion angle from liquid crystal layer upper surface emergent ray are defined, to prevent
Color cross-talk.Therefore, in order to solve technical contradiction between two aspects, the technical bottleneck is broken through, the light of luminescent device is incident to
Dispersion angle φ 2 during liquid crystal panel, and then improve liquid crystal panel and brought when being shown to picture because backlight rising angle is larger
Pixel between color cross-talk problem.
Brief description of the drawings
Accompanying drawing herein is merged in specification and forms the part of this specification, shows the implementation for meeting the present invention
Example is simultaneously used for the principle for explaining the present invention together with specification.
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is technology, the required accompanying drawing used is briefly described in description, it should be apparent that, drawings in the following description are only
Some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawings can be obtained according to these accompanying drawings.
Fig. 1 color cross-talk schematic diagrames between pixel in the prior art；
Fig. 2 is to provide a kind of structural representation of liquid crystal display device in the application one embodiment；
Fig. 3 is the optical display principle schematic diagram of liquid crystal display device in the application one embodiment；
Fig. 4 is the uniformity optical principle schematic diagram in the application one embodiment；
Fig. 5 is to provide a kind of liquid crystal display device in the application another embodiment；
Fig. 6 is to provide a kind of structural representation of luminescent device in the application another embodiment；
Fig. 7 is the light path distribution schematic diagram of luminescent device in another embodiment in the application；
Fig. 8 is the improved optics effect diagram of liquid crystal display device in the application another embodiment；
Fig. 9 provides a kind of structural representation of variation for luminescent device in the application another embodiment；
Figure 10 is a kind of light path distribution schematic diagram of luminescent device variation in the application another embodiment；
Figure 11 is the back light module unit structure schematic diagram for providing a kind of liquid crystal display device in application in further embodiment；
Figure 12 is to provide a kind of structural representation for expanding plate embodiment in the application further embodiment；
Figure 13 is to provide a kind of structural representation of collimating plate embodiment in the application further embodiment；
Figure 14 is a kind of a kind of variation of liquid crystal display device in Figure 11.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
In the description of the invention, it is to be understood that, indicating position or the position such as " on ", " under ", " level ", " vertical "
The term of relation is that description merely for convenience is of the invention and simplifies description based on orientation shown in the drawings or position relationship, and
It is not that the device of instruction or hint meaning or element there must be specific orientation, is constructed and operated with specific orientation,
Therefore it is not considered as limiting the invention.Term " first ", " second ", " the 3rd " are only used for describing purpose, and can not manage
Solve and indicated or what is implied includes one or more technical characteristic to indicate or implying that relative importance either implies.
As shown in Fig. 2 liquid crystal display device 200, including liquid crystal panel and backlight module.
Liquid crystal panel includes：Liquid crystal layer 210, correspondingly configured in the upper side and lower side of liquid crystal layer 210 upper polarizer 211 and it is lower partially
Shake piece 212, and quantum dot colour element layer 220.
Wherein, each pixel is controlled to correspond to liquid crystal molecule in liquid crystal switch cell by TFT drive circuits in liquid crystal layer 210
Torsional direction, coordinate upper polarizer 211 and lower polarizer 212 to control and transmit the light quantity of each pixel.
And quantum dot colour element layer 220, quantum dot colour element layer 220 are configured with the upper surface of upper polarizer 211
Including black matrix" 224 between several spaced multiple color sub-pixel units and each sub-pixel unit, its
In, black matrix" 224 is used to absorb light, to prevent light crosstalk between each adjacent subpixels unit, each sub-pixel unit
It can be excited respectively by the excitation line transmitted and produce fluorescence or directly transmission, the light of corresponding color needed for generation.
Multiple color sub-pixel unit includes red sub-pixel unit 221, green sub-pixels unit 222 and blue subpixels
Unit 223.Certainly, needed to improve display effect, other color sub-pixels units can also be set, such as：White sub-pixels
Unit (not shown in Fig. 2).
Example, during using blue luminescent device, principle of luminosity is excited according to quantum dot, in green sub-pixels unit 222
It is packaged with green quanta point material, and red sub-pixel unit 221 and is packaged with red quantum dot material, blue subpixels
Unit 223 can allow blue excitation light directly to transmit, and can also encapsulate other blue quanta point materials as required.Of course, it is possible to
Using wavelength is shorter and other stronger exciting lights of energy are as luminescent device, such as：Ultraviolet light etc..
Backlight module includes luminescent device 230 and other backlight assemblies, wherein, luminescent device shows for providing liquid crystal panel
Diagram light as needed for.The related structure member of the present application is only shown in this application, to illustrate the application in embodiment
Specific implementation process, those skilled in the art can be arranged as required to the backlight assemblies such as other optical modules, such as：Optics base
Plate and other blooming pieces etc.；And the Collimation optics or proliferation part specifically set in the application other embodiment
Deng.
It is to avoid transmiting as far as possible to ensure that color cross-talk problem will not occur between each color sub-pixels unit
Light enters in its adjacent sub-pixel unit after liquid crystal switch cell corresponding to each sub-pixel unit, prevents between each sub-pixel
The mutual crosstalk of light.As shown in figure 3, enter for the light for preventing the corresponding liquid crystal switch cell of red sub-pixel unit 221 from being controlled
Enter in blue subpixels unit 223 or green sub-pixels unit 222 so that from 221 corresponding liquid crystal shutter of red sub-pixel unit
It must not be entered in unit with maximum angle emergent ray in adjacent green sub-pixels 222.
Therefore, it is possible in order to reduce light crosstalk between each sub-pixel, then from the dispersion angle of liquid crystal layer emergent ray
φ 1 needs to meet formula requirement：1≤arctan of φ (L/H1), as shown in figure 3, L black matrix between each sub-pixel unit
Width, H1 are the height of upper surface to the quantum dot colour element layer lower surface of liquid crystal layer.Wherein, when the width of black matrix"
When different, the minimum widith of black matrix"s of the L between each sub-pixel unit.
As knowable to above-mentioned formula, in order to expand the dispersion angle φ 1 of emergent ray maximum effective span, root as far as possible
Understood according to above-mentioned formula, it is possible to increase the width L of black matrix" between each sub-pixel unit, or reduce the upper surface of liquid crystal layer extremely
The height H1 of quantum dot colour element layer lower surface.But inventor has found, the liquid crystal of the higher resolution such as especially 4K or 8K
In panel, the area accounting of black matrix" has become the display efficiency key factor for influenceing above-mentioned high-resolution liquid crystal panel,
The technical bottleneck that especially display brightness is broken through for needs, it is necessary to by the width control system of black matrix" in below 100um, or even chase after
Ask to below 20um preparation technologies.
Further, in order to reduce liquid crystal layer upper surface to the height H1 of quantum dot colour element layer lower surface, by existing
The bottleneck of polarizer preparation technology and material limits, and usual H1 is 100~900um.If it is the inclined of below 100um to prepare thickness
Piece shake, it is necessary to break through the technical bottleneck for preparing material and technique of existing polarizer, even if it prepares material and technique, even
Structure has important breakthrough, for continuing to improve black matrix" with reduced width, the dispersion angle to expanding emergent ray
φ 1 maximum span effect and it is limited, therefore, by from the dispersion angle of liquid crystal layer emergent ray be limited in compared with
Small range is a kind of effective solution.
Therefore, the present inventor tests by a large amount of research and development, to seek to effectively reduce the angle of divergence from liquid crystal layer emergent ray
Spend φ 1 effective solution.Wherein, in experimentation, inventor has found display resolution, display brightness and light
Relation between the threes of dispersion angle φ 1 is emitted, color cross-talk is had an impact extremely complex, can be obtained by simple inference
Know a kind of linear relationship.Such as when liquid crystal panel resolution ratio improves, its display brightness can be relative due to black matrix" area accounting
Raising display brightness can be caused to reduce, under this condition, do not occur according to regular logical reasoning above-mentioned L and H1 it is constant, therefore,
φ 1 maximum possible value will not also change, and then crosstalk ratio will not change.However, invention human hair in actual experiment
Existing, when display resolution improves to a certain degree, color cross-talk problem can aggravate, and illustrate the dispersion angle φ 1 of emergent ray most
Big span but relatively reduces.
Further, in using reducing from the dispersion angle φ 1 of liquid crystal layer emergent ray some solutions, however,
Inventor has found in experimentation, when the dispersion angle φ 1 of liquid crystal layer emergent ray reduces, display brightness uniformity meeting
There are obvious corruptions.Therefore, in inventor's experimentation, face again keep liquid crystal panel display brightness uniformity with
Improve from contradiction between the dispersion angle φ 1 of liquid crystal layer emergent ray, turning into needs solve another technical barrier.
As shown in figure 3, exemplified by using dot matrix luminescent device as the down straight aphototropism mode set of luminescent device 230, wherein, hair
Optical device 230 is laid in below liquid crystal panel, such as LED.It is uniform mesh to reach backlight illumination to liquid crystal layer
, then needing multiple LEDs to expose to liquid crystal layer has preferable mixed light characteristic.
As shown in figure 3, when the light of LED is incident to liquid crystal panel lower surface, the divergence of beam angle φ
2, then need to meet 2 >=arctan of φ (0.5*D/H2), wherein, D is the center spacing of two neighboring luminescent device light-emitting area,
H2 is distance of any luminescent device light-emitting area to liquid crystal panel lower surface.
In summary, on the one hand, in order to mitigate color cross-talk between a variety of colors sub-pixel, then need to reduce from liquid crystal layer
The dispersion angle of surface emergent ray, on the other hand, directive liquid crystal panel lower surface glazing illuminance uniformity is kept again, then
Need the dispersion angle of raising luminescent device emergent ray.Therefore, in order to solve technical contradiction between two aspects, the skill is broken through
Art bottleneck, dispersion angle φ 2 when the light of luminescent device is incident to liquid crystal panel, then need to meet arctan (0.5*D/H2)
≤φ2≤arctan(L/H1)。
Example, work as L=20um, during H1=100um, arctan (L/H1)=11.3 °, then, make luminescent device light
Maximum dispersion angle when being emitted from liquid crystal layer upper surface, it is necessary in the range of 1≤11.3 ° of 0≤φ value.And in order to carry
High Display panel uniformity, preferably, then φ 2 takes maximum in the spans of φ 1, so, the values of φ 2 can be 11.3 °,
I.e.：So that arctan (0.5*D/H2)=11.3 °, then D/H2 maximums can value be 0.4, it can be the mixed of design backlight module
Electrical distance and lamp spacing parameter provide foundation.Designer can select suitable LED in the range of D/H2≤0.4
Brightness specifications to meet brightness design requirement, and the dispersion angle of the suitable LED of selection, or appropriate backlight
Structure rationally designs the lamp space D between LED to limit the dispersion angle of emergent ray on the basis of above-mentioned selection
And the luminescent device is to the light mixing distance H2 between liquid crystal panel lower surface, to realize that maximum possible optimizes product display performance.
Further, inventor is had found in product design process, when selecting a kind of liquid crystal panel, how for liquid crystal surface
Plate designs the backlight module for meeting performance requirement, usually a kind of technical problem for needing actually to solve.
The first step：Need by liquid crystal panel parameter, it is determined that the maximum possible dispersion angle φ from liquid crystal layer emergent ray
1max, i.e.,：Meet φ 1max=arctan (L/H1) relation.
Second step：So that luminescent device light is incident to dispersion angle φ 2≤φ 1max of liquid crystal layer, that is, meet φ 2≤
arctan(L/H1)。
3rd step：Because 2 minimum values of φ are determined by arctan (0.5*D/H2), as such, it is desirable to meet arctan
(0.5*D/H2)≤arctan (L/H1), i.e.,：D/H2≤2*L/H1.
In the present embodiment, the width of L black matrix between each sub-pixel, H1 are that liquid crystal layer upper surface is colored to quantum dot
The height of pixel layer lower surface, by the confirmable parameter L and H1 of liquid crystal panel, determined with formula D/H2≤2*L/H1
The mixed light characteristic of backlight module, mixed light characteristic are parameter D and H2 relation, wherein, D is two neighboring luminescent device light-emitting area
Center spacing, H2 be any luminescent device light-emitting area to liquid crystal panel lower surface distance.
Further, as shown in figure 4, in order to ensure the uniformity of receiving plane illumination, adjacent two luminescent devices are connecing
The range of exposures in receipts face must have certain overlapping ranges, such as B area in figure.
It is described as follows by taking Fig. 4 as an example：When single luminescent device is shone directly on liquid crystal panel, in the liquid crystal panel
Upper a certain target point illuminance is directly proportional to the luminous intensity of the luminescent device, with the luminescent device surface to the target point it
Between distance square be inversely proportional, and form folder with the normal of the luminescent device light-emitting area and the target point illumination beam
Cosine of an angle is directly proportional, i.e.,：Target point illuminance E (φ) meets formula：E (φ)=I (φ) * cos φ/d2, wherein, I
(φ) is the light distribution of luminescent device, and φ is the normal with the luminescent device light-emitting area and the target point illumination beam institute
Angle is formed, d is the luminescent device light-emitting area to distance between the target point.
In Fig. 4, example, some optics illumination in the A of region：E (φ)=I (φ) * cos φ/d2, wherein, d=H/
Cos φ, H are the distance between the luminescent device light-emitting area and the liquid crystal panel lower surface, therefore, can obtain E (φ)=I (φ)
*cosφ/d2=I (φ) * cos3φ/H2。
It is described as follows so that show uniformity requirement reaches more than 70% as an example, if the uniformity of whole light receiving surface will
Meet 70% requirements above.
On the one hand, if the light receiving surface opening position of the line center face between two luminescent devices is dark
Region, then the illuminance of its single luminescent device received correspond to light receiving surface, it is necessary to reach 0 ° of emergent ray of luminescent device
Illumination E0 more than 35%, so, the superposition illuminance of center position of two luminescent devices at line can then reach
To more than the 70% of E0.
Then need to meet following condition：E (φ) >=0.5*70%*E (0 °), i.e.,：I(φ)*cos3φ/H≥0.35*I
(0 °)/H2, simplified：I(φ)*cos3φ >=0.35*I (0 °), φ maximum φ max can be tried to achieve according to above-mentioned formula, then I
(φmax)*cos3φ max=0.35*I (0 °).
On the other hand, the light receiving surface opening position of the line center face of two luminescent devices is light brighter areas
When, then 0 ° of emergent ray of luminescent device corresponds to the illumination E0 of receiving plane, to reach the line center of two luminescent devices just
To receiving plane opening position illumination more than 70%.
Then need to meet following condition：E (φ)≤0.71*E (0 °), i.e.,:I(φ)*cos3φ/H2≤0.71*I (0°)/
H2, simplified：I (φ) * cos3 φ≤0.71*I (0 °), φ minimum value φ min can be tried to achieve according to above-mentioned formula, then I (φ
Min) * cos3 φ min=0.71*I (0 °).
In summary, if the light distribution of luminescent device is I (φ), and when show uniformity requires more than a%, then two
Center position of the individual luminescent device at line is corresponding, and beam emissions angle is φ at target point on the receiving plane in unitary face, then
Meet formula：I(φmax)*cos3φ max=0.5*a%*I (0 °), and I (φ min) * cos3φ min=0.5/a%*I
(0°)。
Further, if being illustrated exemplified by LED, LED luminous energy is lambertian distribution, then
I (φ)=I0* cos φ, wherein, I0For 0 ° of luminous direction light light intensity value, it is a fixed value, then receiving plane receives list
The Illumination Distribution of individual LED is E (φ)=I (φ) * cos3φ/H=I0*cos4φ/H。
Illustrated by taking Fig. 3 as an example, reach more than 70% if realizing and receiving surface uniformity, need to meet：
E (φ 1) >=35%*E (0 °), i.e.,：Cos4 φ 1 >=0.35, try to achieve 39.5 ° of φ 1max ≈, then 0.5*D/H2≤
Tan39.5 ° of ≈ 0.82, i.e. D/H2≤1.64.
And E (φ 1)≤0.71%*E (0 °) is cos4 φ 1≤0.71, tries to achieve 23.5 ° of φ 1min ≈, then 0.5*D/
H2 >=tan23.5 ° of ≈ 0.43, i.e. D/H2 >=0.86.
Therefore, if luminescent device luminous energy is lambertian distribution, the mixed light characteristic of backlight module needs to meet：0.86
≤ D/H2≤1.64, wherein D are the center spacing of two neighboring luminescent device light-emitting area, and H2 is the luminous of any luminescent device
The distance of face to liquid crystal panel lower surface.
In Fig. 2, illuminance uniformity on liquid crystal panel is irradiated in order to further improve luminescent device 230, and to the greatest extent may be used
The incident angle for being incident to the liquid crystal layer glazed thread can be reduced, to mitigate the mutual cross-interference issue of color between pixel, the application is implemented
In the liquid crystal display device of example, the Collimation optics for luminescent device emergent ray collimate pretreatment are set, and it is right
Emergent ray energy realizes that diffusion homogenizes from the Collimation optics, and the illumination on light receiving surface can be made more uniform
Distribution, so that D/H2Value can increase by more than 2~3 times, therefore, in the liquid crystal display device using Collimation optics, can expire
1.72≤D/H of foot2≤4.92。
The Collimation optics are for divergent rays to be become to a kind of optics close to parallel rays, such as convex lens
Deng.
It should be noted that increasing in the liquid crystal display of luminescent device emergent ray collimation processing, on the one hand,
Can make luminescent device design have more greatly can design space, the Energy distribution of luminescent device emergent ray is diffused even
Change, improve the show uniformity of liquid crystal display device, on the other hand, due to carrying out collimation processing to luminescent device emergent ray,
So that diminishing from liquid crystal layer emergent ray dispersion angle, color cross-talk problem between each pixel can be reduced.
For the parameter request of Collimation optics in further specification the present embodiment, as shown in Figure 3, it is desirable to from photophore
After Collimation optics carry out collimation processing, beam projecting angle φ 3 needs to meet part light：φ3≤arctan(L/
H1), wherein, the width of L black matrix between each sub-pixel, H1 is under upper surface to the quantum dot colour element layer of liquid crystal layer
The height on surface.
Further, as shown in figure 5, display device includes liquid crystal panel 500 and the backlight module for providing backlight
400, liquid crystal panel 500 is relative with backlight module 400, and liquid crystal panel 500 is arranged on the top of backlight module 400.
Liquid crystal panel 500 includes quantum dot colour element layer 520, upper polarizer 512, the liquid crystal layer being cascading
511 and lower polarizer 510, quantum dot colour element layer 520 include several spaced multiple color sub-pixel units and
Black matrix" between each color sub-pixels, wherein, multiple color sub-pixel unit includes red sub-pixel unit 521, green
Sub-pixel unit 522 and the unit of blue subpixels 523, wherein, red sub-pixel unit 521 sets red quantum dot material, green
Sub-pixels unit 522 sets green quanta point material, and blue subpixels unit 523 is not provided with quanta point material or set blue
Color quanta point material.
Luminescent device is carried on the back according to blueness, then Blue backlight is after the processing of lower polarizer 510, by liquid crystal layer 511
Each liquid crystal switch cell switch control process, then be radiated at through upper polarizer 512 on three kinds of pixel cells of red, green and blue,
Red quantum dot material in red sub-pixel unit 521, which absorbs blue light, can be converted into feux rouges, green sub-pixels unit 522
In green quanta point material absorb blue light can be converted into green glow, Blue backlight can be direct in blue subpixels unit 523
Through transmitting blue light.Upper polarizer 512, liquid crystal layer 511,510 3 layers of lower polarizer, which fit together, is mainly used in control institute thoroughly
The light intensity of light is crossed, quantum dot colour element layer receives exciting for varying strength light, and the color that can produce different brightness is shown.
Backlight module 400 includes backboard 420 and the multiple luminescent devices 410 being arranged on above backboard, wherein, the present embodiment
The concrete structure of middle luminescent device 410 can refer to shown in Fig. 6, including LED 200 and Collimation optics 300, light
Learn collimating element 300 and be arranged on the top of LED 200.
Collimation optics 300 include support frame 310 and the collimater 320 between support frame in the present embodiment, collimation
Device 320 includes incidence surface 321 and exiting surface 322.Wherein, incidence surface 321 and exiting surface 322 are circumferentially symmetrical respectively.
Wherein, the slope on the incidence surface 321 of collimater 320 is different, is convex surface.
Preferably, incidence surface 321 divides three sections of designs, be the sub- incidence surface 321a of negative first sequentially including slope, slope be
Zero the second sub- incidence surface 321b and slope is the 3rd positive sub- incidence surface 321c, and exiting surface 322 is arranged to plane.
As shown in fig. 7, the angle between the first sub- incidence surface 321a and support frame 310 inner surface is ∠ 0, the 3rd sub- incidence surface
321c and the first sub- incidence surface 321a are symmetrical.
Specifically, through the first sub- incidence surface 321a, the maximum light of incidence angle and the formed folder of the minimum light of incidence angle
Angle is ∠ A；Angle formed by the incident ray at the second sub- incidence surface 321b both ends is ∠ B；Through the 3rd sub- incidence surface 321c, enter
Angle formed by the maximum light of the firing angle light minimum with incidence angle is ∠ C.
Illustratively, a certain bar incident ray is incident through the first sub- incidence surface 321a, the folder of the incident ray and vertical direction
Angle is that the angle between ∠ 1, with the first sub- incidence surface 321a normals is ∠ 2；After refraction, refracted light enters light with the first son
Angle between the 321a normals of face is ∠ 3, and the angle between the normal of exiting surface 322 is ∠ 4；After exiting surface is emitted, outgoing
Angle between light and exiting surface normal is angle of emergence ∠ 5.
∠ 6 is that another incident ray is incident through the first sub- incidence surface 321a in Fig. 7, then after the outgoing of exiting surface 322,
Emergent ray and the angle of emergence formed by exiting surface normal.
Further, it is known that refractive index n and ∠ 1, it is assumed that known ∠ 0, then：
∠ 2=∠ 1+90 °-∠ 0
Further, according to the law of refraction：Sin ∠ 2=n*sin ∠ 3
Further, ∠ 3=arcsin (sin ∠ 2/n)=arcsin [sin (∠ 1+90 °-∠ 0)/n]
Further, -90 ° of+∠ 0 of ∠ 4=∠ 3- (90 ° of-∠ 0)=arcsin [sin (∠ 1+90 °-∠ 0)/n]
Further, according to the law of refraction：Sin ∠ 5=n*sin ∠ 4
Further,
∠ 5=arcsin (n*sin ∠ 4)=arcsin { n*sin { -90 ° of+∠ of arcsin [sin (∠ 1+90 °-∠ 0)/n]
0}}
Illustratively, changed for another incident ray, ∠ 1, can similarly release ∠ 6 and ∠ 0 relation：
∠ 6=arcsin { n*sin { -90 ° of+∠ 0 of arcsin [sin (∠ 1+90 °-∠ 0)/n] } }
Specifically, ∠ 1 is set-point in formula described above, as ∠ 1=(∠ A+ ∠ B+ ∠ C)/2, angle of incidence of light
Maximum, the incident light of the angle, after the collimating structure outgoing in the present embodiment, angle of emergence ∠ 5 is on negative slope direction
Maximum angular；As ∠ 1=∠ B/2, angle of incidence of light is minimum, the incident light of the angle, by the collimation in the present embodiment
After structure outgoing, angle of emergence ∠ 6 is the maximum angular on positive slope direction.
It is further preferred that the Collimation optics in the present embodiment, give the second sub- incidence surface both ends incident ray institute
Into angle ∠ B, the angle ∠ 0 between the first sub- incidence surface of collimater and support frame inner surface meets：It is above-mentioned to enter light through the first son
Face is incident, is emitted through exiting surface, the size of the maximum angle of emergence ∠ 5 on negative slope direction goes out with the maximum on positive slope direction
Firing angle ∠'s 6 is equal in magnitude, is equal to ∠ B half.
Other components on this area liquid crystal panel and backlight module have been well known to those skilled in the art,
The state of the art is referred to, is not described in detail herein.
Compared with prior art, the liquid crystal display device that the present embodiment provides, by setting light above LED
Learn collimating element, the collimater exiting surface of the collimating structure be plane, incidence surface order setting negative slope incidence surface, plane, just
Three sections of slope incidence surface, so as to increase the exit aperture of light, the conspicuous invariant of drawing in optics, exit aperture increase,
The rising angle of light necessarily reduces, and so as to which light realizes collimation outgoing to a certain extent, and then improves liquid crystal panel
When being shown picture because of color cross-talk problem different pixels unit caused by backlight rising angle is too big, improve color string
The schematic diagram for disturbing problem is as shown in Figure 8.
Further, shown in reference picture 9, Collimation optics 300 include support frame 310 and the standard being arranged between support frame
Straight device 320, collimater 320 includes incidence surface 321 and exiting surface 322, and incidence surface 321 and exiting surface 322 are circumferentially right respectively
Claim, in addition in the structure for the luminescent device incidence surface 321 that the present embodiment provides and the first sub- incidence surface 321a and support frame 310
The condition derivation that angle between surface is met is described in detail in embodiment one, and here is omitted.
Further, the order of exiting surface 322 include the first positive slope exiting surface 322a, the first negative slope exiting surface 322b,
Plane 322c, the second positive slope exiting surface 322d and the second negative slope exiting surface 322e.
Specifically, the first positive slope exiting surface 322a and the first negative slope exiting surface 322b separation one are arranged on light
After the first sub- incidence surface 321a refractions, the exiting surface position corresponding to the refracted light for being zero with vertical direction angle；The
One negative slope exiting surface 322b and plane 322c separation two is arranged on light after the second sub- incidence surface 321b refractions,
The exiting surface position corresponding to refracted light with vertical direction angle on maximum negative slope direction；Plane 322c and second
Positive slope exiting surface 322d separation three is arranged on light after the second sub- incidence surface 321b refractions, is pressed from both sides with vertical direction
The exiting surface position corresponding to refracted light on the maximum positive slope direction in angle；Second positive slope exiting surface 322d and second
Negative slope exiting surface 322e separation four is arranged on light after the 3rd sub- incidence surface 321c refractions, is pressed from both sides with vertical direction
Exiting surface position corresponding to the refracted light that angle is zero.Separation one and separation two respectively with separation four and separation three
Symmetrically.
As shown in Figure 10, the first positive slope exiting surface 322a, the first negative slope exiting surface 322b, the second positive slope exiting surface
322d and the second negative slope exiting surface 322e principles designed are to ensure the refraction of the refraction angle maximum after incidence surface reflects
Light, when being emitted through exiting surface, emergent ray can be vertical with exiting surface, so as to ensure that light enters light from optically denser medium
Refraction angle will not become big when dredging medium.
Compared with prior art, a kind of luminescent device for being used to provide backlight that the present embodiment provides, on the one hand according to light
The conspicuous invariant of drawing in, by setting collimating structure above LED, the collimater incidence surface of the collimating structure
Negative slope incidence surface, plane, positive slope incidence surface three parts are set, so as to increase the exit aperture of light, reduce light
Rising angle；Another aspect exiting surface by setting positive slope exiting surface and negative slope exiting surface in specific location, make through
The refracted light that refraction angle is maximum after incidence surface reflects is crossed, when by exiting surface outgoing, emergent ray is vertical with exiting surface,
So as to ensure that light from optically denser medium enter optically thinner medium when refraction angle will not become big, and then the low-angle for realizing backlight goes out
Light, realize the collimation outgoing of light to a certain extent.
, can in order to improve show uniformity, or increase mixed light characteristic D/H2 value in the application in one embodiment
Processing is diffused with the light to luminescent device in advance, light diverging lens, such as concavees lens are put on luminescent device.With
And light collimation lens, collimation processing is carried out to diffusing light, wherein, the collimation angle φ 3 of light collimation lens is, it is necessary to full
Sufficient 3≤arctan of equation φ (L/H1) requires, L is the width of the black matrix, and H1 is the upper surface of liquid crystal layer to quantum stippling
The height of color pixel layer lower surface.
One embodiment provides another liquid crystal display device in the application, wherein, liquid crystal display device in the embodiment
Middle liquid crystal panel part is same as the previously described embodiments, repeats no more.In addition, the another one kind that provides is by photophore in this embodiment
The backlight module that part is diffused, as shown in figure 11, luminescent device can be angle of divergence very little in the present embodiment, collimation compares
High feature, such as：Lasing fluorescence device, or the luminescent device of collimation lens is set above LED, the backlight module specifically includes
Luminescent device 21, beam expanding lens, the luminescent device emergent ray is expanded beam expanding lens and collimation processing.Luminescent device 21
To be spaced the multiple of laying, for providing backlight luminescence device for backlight module.
Beam expanding lens includes input negative lens and output positive lens.Wherein, negative lens such as concavees lens, output positive lens are inputted such as
Convex lens.
Wherein, negative lens is inputted in beam expanding lens can carry out expanding processing to the light of luminescent device, improve point light source light-emitting
The spot diameter of the light beam of device, increase the light juxtaposition possibility of the luminescent device of multiple spot lights, to lift display
Uniformity.
Specifically, as shown in figure 12, can be provided with the present embodiment in the top of luminescent device 21 and expand plate 22, with
And as shown in figure 13, collimating plate 23 is provided with above plate 22 expanding.Wherein, expand corresponding with multiple luminescent devices on plate 22
It is provided with multiple input negative lenses 221, and collimating plate 23 and is correspondingly arranged on multiple output positive lens with multiple luminescent devices
231。
Preferably, if so that inputting the rear focus of negative lens 221, exporting the object focus of positive lens 231 and light
The center three of device 21 overlaps, and makes the emergent ray of luminescent device 21 successively by expanding the input negative lens 221 on plate 22
With the output positive lens 231 on collimating plate 23, the diffusion to the emergent ray of luminescent device 21 and further collimation are realized.
It can be seen from principle, the light that is sent positioned at lens focus, light ray parallel is emitted after lens, according to this principle and light path
Reversible principle, if the rear focus of recessed plano lens overlaps with the object focus of planoconvex spotlight, then, directional light is by recessed flat
After lens diverging, then the still exiting parallel after planoconvex spotlight, those skilled in the art can be according to the work about lens
Principle understands, is repeated no more in the present embodiment.
To realize the optimum efficiency of the present invention, certain preferred embodiments are provided in the present embodiment.
Further, it is defeated the characteristics of the emergent ray less parallel of the operation principle of foundation lens and luminescent device 21
Enter negative lens 221 and be designed as concavees lens, both having inputted negative lens 221 includes the first sub- incidence surface that incidence surface side is concave surface, goes out
Smooth surface side is the first exiting surface of plane；Output positive lens 231 is designed as convex lens, and both having exported positive lens 231 is included into light
Face side is the second sub- incidence surface of plane, and exiting surface side is second exiting surface on convex surface.
The emergent ray of luminescent device 21 successively through being concave surface the first sub- incidence surface and be plane the first exiting surface,
The diverging of luminescent device 21 is realized, in the case of the negligible amounts of luminescent device 21, luminescent device 21 is effectively increased and goes out
The scope of light is penetrated, then the light of luminescent device 21 after diverging is successively by being the second sub- incidence surface of plane and being convex
Second exiting surface in face, realizes the collimation to luminescent device 21.
Further, efficiently utilize luminescent device 21, the size of luminescent device 21, the size of input negative lens 221 and
The size of output positive lens 231 increases successively, the emergent ray of luminescent device 21 is all born by expanding the input on plate 22
The structure of lens 221, both when setting expands the concave surface on 22 first sub- incidence surface of plate, it should ensure that the beam projecting of luminescent device 21
Scope is less than the size of the first sub- incidence surface upper recess surface.
And because the light of luminescent device 21 is after input negative lens 221 is dissipated, the light of luminescent device 21 by
Parallel rays originally is changed into the scattering light of self-scattering lens outgoing, therefore the outgoing scope of scattering light is compared initially
Light significantly increases, and equally, to increase the utilization rate of the scattering light, ensures that the scattering light all enters to inject collimating plate 23
On output positive lens 231, the concave surface on the first sub- incidence surface is less than the size on convex surface on the second exiting surface.
Further, the concave surface on 21 and first sub- incidence surface of luminescent device is realized and the convex surface on the second exiting surface
On the basis of one-to-one corresponding, to ensure the luminescent device of backlight module offer uniformly and reducing using luminescent device 21 as far as possible
Quantity is laid, the luminescent device 21 in the present embodiment is laid multiple for uniform intervals, accordingly, inputs the He of negative lens 221
It is the multiple of uniform intervals laying to export positive lens 231, and particular number should be according to the size of liquid crystal panel, and expands plate 22
The setting size on convex surface is set on second exiting surface in the setting size of upper first sub- incidence surface upper recess surface, collimating plate 23, most
Reach eventually and use as far as possible few lasing fluorescence device, be embodied as the purpose that whole display picture provides backlight luminescence device.
Alternatively, it is also to reduce light damage of the light of luminescent device 21 after expanding plate 22 and collimating plate 23
Lose, it is preferred that expanding the material of plate 22 and collimating plate 23 includes higher acrylic (PMMA) material of optical transmittance, poly- carbon
Acid esters (PC) material.
Compared with prior art, the advantageous effects for the technical scheme that the embodiment of the present application is proposed include：
The present embodiment provides a kind of display device, including liquid crystal panel and backlight module, wherein, backlight module includes luminous
Device, it is disposed on successively above luminescent device and expands plate and collimating plate, expand plate, is set by corresponding luminescent device
Input negative lens to form, for being diffused luminescent device；Collimating plate, the output positive lens set by corresponding luminescent device
Form, for being collimated to luminescent device；Input the rear focus of negative lens, export the object focus and hair of positive lens
The center three of optical device overlaps.In the backlight module that the present embodiment provides, have by being sequentially arranged above in luminescent device
Diffusion expands plate and collimating plate, is made up of, collimates the input negative lens that effect is dissipated with light specifically, expanding plate
Plate is made up of the output positive lens with light collimating effect.Due to inputting the light diffusion of negative lens and exporting just saturating
The light collimating effect of mirror, in the case of luminescent device negligible amounts, light is spread to increase by inputting negative lens first
The outgoing scope of laser beam, then the scattering light after light diffusion is collimated by inputting negative lens, ensures light
Line exiting parallel, and then solve the problems, such as the color cross-talk that liquid crystal panel occurs.
In summary, a kind of liquid crystal display device that the present patent application provides, including liquid crystal panel, liquid crystal panel include according to
Secondary the quantum dot colour element layer being stacked, upper polarizer, liquid crystal switch cell and lower polarizer.Wherein, quantum dot is colored
Pixel layer includes red sub-pixel unit, green sub-pixels unit and blue subpixels unit.The display device also includes setting
Backlight module below the liquid crystal panel, backlight module include backboard and the luminescent device being disposed there above, and this is luminous
Device includes LED and the Collimation optics being disposed there above.According to conspicuous invariant is drawn, by being lighted in LED
Collimation optics are set above device, make beam projecting aperture increases, are reduced so as to the rising angle of backlight, light is realized
A certain degree of collimation outgoing, and then improve liquid crystal panel and brought when being shown to picture because backlight rising angle is larger
Pixel between color cross-talk problem.
It is different and one embodiment provides the variation of another liquid crystal display device in the application
Finally it should be noted that：Various embodiments above is only illustrating the technical scheme that collects of the present invention, rather than it is entered
Row limitation；Although the present invention is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent replacement；And these modifications or replacement, the essence of appropriate technical solution is departed from the present invention
The scope of each embodiment technical scheme.
Claims (7)
1. a kind of liquid crystal display device, including liquid crystal panel and backlight module, wherein, the liquid crystal panel includes：Liquid crystal layer,
Described liquid crystal layer the upper side and lower side correspondingly configures upper polarizer and lower polarizer, and quantum dot colour element layer, its feature exist
In,
The quantum dot colour element layer configuration is above the upper polarizer, and the quantum dot colour element layer is including some
Individual spaced multiple color sub-pixel unit and the black matrix" between the sub-pixel unit；
The backlight module includes luminescent device and other backlight assemblies, and the luminescent device shows for providing the liquid crystal panel
Diagram light as needed for；
Dispersion angle φ 2 when the light of the luminescent device is incident to the liquid crystal panel, then need to meet formula arctan
（0.5*D/H2）≤φ2≤arctan（L/H1）It is required that wherein, D is between the center of the two neighboring luminescent device light-emitting area
Away from, H2 is distance of any luminescent device light-emitting area to the liquid crystal panel lower surface, and L is the width of the black matrix,
H1 is the height of upper surface to the quantum dot colour element layer lower surface of the liquid crystal layer.
2. liquid crystal display device as claimed in claim 1, it is characterised in that the multiple color sub-pixel unit includes red
Sub-pixel unit, green sub-pixels unit and blue subpixels unit.
3. liquid crystal display device as claimed in claim 2, it is characterised in that be packaged with green in the green sub-pixels unit
Red quantum dot material, the blue subpixels unit envelope are packaged with quanta point material, and the red sub-pixel unit
Equipped with blue quanta point material, or directly transmitting blue light.
4. liquid crystal display device as claimed in claim 1, it is characterised in that L is minimum widith in the black matrix.
5. liquid crystal display device as claimed in claim 1, it is characterised in that the backlight module is with the luminescent device point
Configuration is laid in the down straight aphototropism mode set below the liquid crystal panel.
6. liquid crystal display device as claimed in claim 1, it is characterised in that luminescent device is lasing fluorescence chip.
7. liquid crystal display device as claimed in claim 6, it is characterised in that be provided with collimation above the lasing fluorescence chip
Lens.
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| CN201710675141.7A CN107643628A (en) | 2017-08-09 | 2017-08-09 | A kind of liquid crystal display device |
| PCT/CN2017/116670 WO2019029086A1 (en) | 2017-08-09 | 2017-12-15 | Liquid crystal display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710675141.7A CN107643628A (en) | 2017-08-09 | 2017-08-09 | A kind of liquid crystal display device |
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| CN107643628A true CN107643628A (en) | 2018-01-30 |
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| CN110071144A (en) * | 2019-04-08 | 2019-07-30 | 深圳市华星光电半导体显示技术有限公司 | OLED display and preparation method |
| CN110211491A (en) * | 2019-06-05 | 2019-09-06 | 京东方科技集团股份有限公司 | A kind of preparation method of color membrane substrates, display panel and display panel |
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| CN101620319A (en) * | 2009-08-06 | 2010-01-06 | 深圳超多维光电子有限公司 | Moire-free three-dimensional display device |
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Application publication date: 20180130 |