CN107490899A - A kind of backlight module and liquid crystal display device - Google Patents
A kind of backlight module and liquid crystal display device Download PDFInfo
- Publication number
- CN107490899A CN107490899A CN201710856620.9A CN201710856620A CN107490899A CN 107490899 A CN107490899 A CN 107490899A CN 201710856620 A CN201710856620 A CN 201710856620A CN 107490899 A CN107490899 A CN 107490899A
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- China
- Prior art keywords
- backlight
- blue
- backlight module
- powder layer
- blue chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- 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
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Luminescent Compositions (AREA)
Abstract
The invention provides a kind of backlight module, the backlight module includes backlight and backlight driving unit, and the backlight includes luminescent device, and the backlight driving unit produces pwm signal and the backlight is dimmed, and the luminescent device includes：Blue chip, the blue chip are used to launch blue light；Noctilucent powder layer, the noctilucent powder layer are arranged on the blue chip, and the noctilucent powder layer includes the blue noctilucent powder for absorbing the blue light；Glue-line is encapsulated, the blue chip is packaged in the encapsulation glue-line with the noctilucent powder layer, and the encapsulation glue-line includes green emitting phosphor and fluoride red fluorescence powder.When the backlight module of the present invention is improved under PWM dimming states, blue chip is closed, Red Shift Phenomena caused by the sunset glow influence of fluoride red fluorescence powder, chroma stability is ensure that, improves the image quality of TV.
Description
Technical field
The application is related to display technology field, more particularly to a kind of backlight module and liquid crystal display device.
Background technology
Television backlight light source uses structure as shown in Figure 1 more at present, and it includes blue chip 1 ' and covering blue light core
The packaging plastic 2 ' of piece 1 ', fluoride red fluorescence powder 3 ' and green emitting phosphor 4 ' are included in packaging plastic 2 '.Wherein, fluoride is red
Fluorescent material is the fluoride that 4 valency manganese excite, and its molecular formula is AxMFy：Mn4+, wherein A=Li, Na, K, Ca, Sr, Ba etc., M=Si,
Al, Y, Sc etc., x span is 1-3, and y span is 5-8.Conventional fluorination matter fluorescent powder includes K2SiF6:Mn4+
（KSF）、K2GeF6:Mn4+（KGF）、K2TiF6:Mn4+（KTF）Three kinds of systems.The half-wave of fluoride red fluorescence powder is wide narrower, light
Secondary reabsorption it is less, its green emitting phosphor of arranging in pairs or groups can realize higher brightness and high colour gamut, therefore the current program is a large amount of
Used in middle-end type.The advantages of PWM light regulating technologies are simple with its control simultaneously, and flexibly and dynamic response is good, largely in LED
Applied in backlight drive, when being dimmed using PWM, light modulating frequency is generally 200HZ, i.e. a cycle 5ms.When fluoride red is glimmering
When light powder and PWM light regulating technologies are used in conjunction with, when PWM works, i.e., during normally lighting, colourity is after LED coordinates panel
Normal colourity, but occur in the PWM light modulation down periods abnormal.The down periods are dimmed in PWM, because blue chip is closed, no longer
Launch blue light, the fluorescent effect of fluoride red fluorescence powder shows, caused in the backlight down periods（Within 5ms）Its fluoride is red
The red sunset glow long lasting effect of color fluorescent material, cause red ratio increase in whole PWM dimming process, ultimately result in chromaticity coordinates X
, there is Red Shift Phenomena, as shown in Fig. 2 the problem seriously affects the image quality quality of TV in value increase.
The content of the invention
The present invention is intended to provide a kind of backlight module and its display device, improve under PWM dimming states, blue chip closes
When closing, Red Shift Phenomena caused by the sunset glow influence of fluoride red fluorescence powder, chroma stability is ensure that, improves the picture matter of TV
Amount.
The invention provides a kind of backlight module, the backlight module includes backlight and backlight driving unit, the back of the body
Light source includes luminescent device, and the backlight driving unit produces pwm signal and the backlight is dimmed, the luminescent device
Including：Blue chip, the blue chip are used to launch blue light；Noctilucent powder layer, the noctilucent powder layer are arranged at the blue light core
On piece, the noctilucent powder layer includes the blue noctilucent powder for absorbing the blue light；Encapsulate glue-line, the blue chip and the night
Light bisque is packaged in the encapsulation glue-line, and the encapsulation glue-line includes green emitting phosphor and fluoride red fluorescence powder..
Further, the noctilucent powder layer covers the blue chip.
Further, the noctilucent powder layer is arranged on the blue chip by application pattern.
Further, the fluoride red fluorescence powder is the fluoride that tetravalent manganese excites, and its chemical composition is：AxMFy：
Mn4+, wherein A is Li, Na, K, Ca, Sr, the one or more in Ba, the one or more in M Si, Al, Y, Sc, x value
Scope is 1-3, and y span is 5-8.
Preferably, the fluoride red fluorescence powder is K2SiF6:Mn4+、K2GeF6:Mn4+、K2TiF6:Mn4+In one kind
It is or several.
In addition, present invention also offers a kind of liquid crystal display device, the liquid crystal display device includes above-mentioned backlight module.
The backlight module of the present invention is included in the photophore that the noctilucent powder layer comprising blue noctilucent powder is set on blue chip
Part, using the absorbing ability and the characteristic of automatic luminous in the dark of luminescent powder, when being dimmed using pwm signal, when LED is blue
When optical chip is in open mode, blue noctilucent powder fully absorbs light and stored, when LED blue chips are closed, blue night
Light powder sends blue light, excites green emitting phosphor to remix the fluorescent effect of fluoride red fluorescence powder, and three color complementations dim PWM
Chroma stability under state, improve when blue chip is closed, red shift caused by the sunset glow influence of fluoride red fluorescence powder
Phenomenon, effectively lift image quality performance.
Brief description of the drawings
Fig. 1 is the fluoride red fluorescence powder of prior art（Exemplified by KSF）LED composition schematic diagram；
Fig. 2 is fluoride red fluorescence powder（Exemplified by KSF）Delay effect figure；
Fig. 3 is the fluoride red fluorescence powder used in the embodiment of the present invention（Exemplified by KSF）LED composition schematic diagram.
Embodiment
In order that technical problems, technical solutions and advantageous effects to be solved by the present invention are more clearly understood, below in conjunction with
Embodiment and Figure of description, the present invention will be described in further detail.It should be understood that specific embodiment described herein
Only to explain the present invention, it is not intended to limit the present invention.
The embodiments of the invention provide a kind of backlight module, backlight module includes backlight and backlight driving unit, backlight
Module can be this area common down straight aphototropism mode set or sidelight type backlight module, for down straight aphototropism mode set, remove
Outside backlight and backlight driving unit, backlight module may also include the structures such as backboard, reflector plate, diffuser plate, glue frame, diaphragm, right
In sidelight type backlight module, backlight module may also include the structures such as backboard, reflector plate, light guide plate, diaphragm.The backlight of the present invention is driven
Moving cell produces pwm signal and backlight is dimmed, and backlight includes LED.
Shown in Fig. 3 for the LED used in the embodiment of the present invention.As shown in figure 3, LED includes indigo plant
Optical chip 1, noctilucent powder layer 2 and encapsulation glue-line 3, wherein, blue chip 1 launches blue light, and noctilucent powder layer 2 is arranged at blue chip 2
On, noctilucent powder layer 2 includes blue noctilucent powder, and blue chip 1 and noctilucent powder layer 2 are packaged in encapsulation glue-line 3, encapsulate glue-line 3
In include green emitting phosphor 4 and fluoride red fluorescence powder 5.When backlight module works, realize that LED is carried on the back using PWM light regulating technologies
Optical drive, the LED used in the embodiment of the present invention work in such a way：When LED is turned on, blue chip 1 is sent out
Go out blue light, absorb various light, the especially absorbability of below 450nm shortwaves because luminescent powder has, therefore in noctilucent powder layer 2
Blue noctilucent powder fully absorbs light and stored, and removes the blue light that blue noctilucent powder absorbs, the blue light collocation that blue chip 1 is sent
Green emitting phosphor and fluoride red fluorescence powder carry out normal colourity and shown, blue in the shut-in time when blue chip 1 is closed
Optical chip 1 no longer sends blue light, and now, the blue noctilucent powder in noctilucent powder layer 2 sends blue light, and blue light excites green emitting phosphor again
The fluorescent effect of mixed fluoride thing red fluorescence powder, three color complementations make the colourity when blue chip is closed normal, eliminate fluorination
Red sunset glow caused by the fluorescent effect of thing red fluorescence powder in the LED down periods influences, and then avoids using PWM light modulation skills
Red Shift Phenomena during art, the chroma stability under PWM dimming states is ensure that, improve image quality performance.
Because of the blue light within the shut-in time of blue chip 1, sent automatically using blue noctilucent powder, in order to preferably eliminate
The fluorescent effect of fluoride red fluorescence powder in encapsulation glue-line is scattered in, preferably noctilucent powder layer 2 covers blue chip 1, ensures blue
The range and uniformity for the blue light that color luminescent powder is sent, preferably eliminate fluorescent effect.
Noctilucent powder layer 2 can be arranged on blue chip 1 by the mode such as applying, spraying.Present invention preferably employs in blue light
The surrounding of chip 1 applies noctilucent powder layer 2.
The fluoride red fluorescence powder 5 of the present invention is the fluoride that tetravalent manganese excites, and its chemical composition is：AxMFy：Mn4+,
Wherein A is Li, Na, K, Ca, Sr, the one or more in Ba, the one or more in M Si, Al, Y, Sc, x span
For 1-3, y span is 5-8.Preferably, the fluoride red fluorescence powder is conventional K2SiF6:Mn4+（KSF）、
K2GeF6:Mn4+（KGF）、K2TiF6:Mn4+（KTF）In one or more.
The backlight module provided based on above-described embodiment, present invention also provides liquid crystal display device, liquid crystal display device
The backlight module provided including above-described embodiment, liquid crystal display device may also include the parts such as liquid crystal panel and front frame.
Above embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further specifically
It is bright, it should be understood that the embodiment that these are only the present invention, the protection model being not intended to limit the present invention
Enclose, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., should be included in the present invention
Protection domain within.
Claims (6)
1. a kind of backlight module, the backlight module includes backlight and backlight driving unit, and the backlight includes photophore
Part, the backlight driving unit produce pwm signal and the backlight are dimmed, it is characterised in that the luminescent device bag
Include：
Blue chip, the blue chip are used to launch blue light；
Noctilucent powder layer, the noctilucent powder layer are arranged on the blue chip, and the noctilucent powder layer, which includes, absorbs the blue light
Blue noctilucent powder；
Glue-line is encapsulated, the blue chip is packaged in the encapsulation glue-line with the noctilucent powder layer, and the encapsulation glue-line includes
Green emitting phosphor and fluoride red fluorescence powder.
2. backlight module as claimed in claim 1, it is characterised in that：The noctilucent powder layer covers the blue chip.
3. backlight module as claimed in claim 1, it is characterised in that：The noctilucent powder layer is arranged at described by application pattern
On blue chip.
4. the backlight module as described in claim any one of 1-3, it is characterised in that：The fluoride red fluorescence powder is tetravalence
The fluoride that manganese excites, its chemical composition are：AxMFy：Mn4+, wherein A is Li, Na, K, Ca, Sr, the one or more in Ba, M
For Si, Al, Y, the one or more in Sc, x span is 1-3, and y span is 5-8.
5. backlight module as claimed in claim 4, it is characterised in that：The fluoride red fluorescence powder is K2SiF6:Mn4+、
K2GeF6:Mn4+、K2TiF6:Mn4+In one or more.
A kind of 6. liquid crystal display device, it is characterised in that：The liquid crystal display device is included described in claim any one of 1-5
Backlight module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710856620.9A CN107490899A (en) | 2017-09-21 | 2017-09-21 | A kind of backlight module and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710856620.9A CN107490899A (en) | 2017-09-21 | 2017-09-21 | A kind of backlight module and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107490899A true CN107490899A (en) | 2017-12-19 |
Family
ID=60651806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710856620.9A Withdrawn CN107490899A (en) | 2017-09-21 | 2017-09-21 | A kind of backlight module and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107490899A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102468414A (en) * | 2010-11-09 | 2012-05-23 | 四川新力光源有限公司 | Pulse LED (Light Emitting Diode) white light emitting device |
| CN104269489A (en) * | 2010-03-12 | 2015-01-07 | 四川新力光源股份有限公司 | Method for generating white light based on ultraviolet or blue light LED chips |
| CN106328635A (en) * | 2016-08-18 | 2017-01-11 | 武汉保丽量彩科技有限公司 | Wide-color-gamut light-emitting device and preparation method thereof |
-
2017
- 2017-09-21 CN CN201710856620.9A patent/CN107490899A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269489A (en) * | 2010-03-12 | 2015-01-07 | 四川新力光源股份有限公司 | Method for generating white light based on ultraviolet or blue light LED chips |
| CN102468414A (en) * | 2010-11-09 | 2012-05-23 | 四川新力光源有限公司 | Pulse LED (Light Emitting Diode) white light emitting device |
| CN106328635A (en) * | 2016-08-18 | 2017-01-11 | 武汉保丽量彩科技有限公司 | Wide-color-gamut light-emitting device and preparation method thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20171219 |
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| WW01 | Invention patent application withdrawn after publication |