CN109243377A - A kind of backlight module, display panel and display device - Google Patents
A kind of backlight module, display panel and display device Download PDFInfo
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- CN109243377A CN109243377A CN201811249928.8A CN201811249928A CN109243377A CN 109243377 A CN109243377 A CN 109243377A CN 201811249928 A CN201811249928 A CN 201811249928A CN 109243377 A CN109243377 A CN 109243377A
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- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The embodiment of the present invention provides a kind of backlight module, display panel and display device, wherein, backlight module includes: backboard, light source assembly and the printed circuit board being arranged on backboard, printed circuit board includes: low level signal generative circuit, low level signal generative circuit, brightness for the light projected according to light source assembly generates low level signal.Low level signal generative circuit of the embodiment of the present invention by setting on a printed circuit, the brightness for the light that can be projected according to light source assembly is come the real-time low level signal for adjusting generation, to close thin film transistor (TFT) in time, image residue caused by generating leakage current is avoided, ensure that the display effect of display device.
Description
Technical field
The present embodiments relate to field of display technology, and in particular to a kind of backlight module, display panel and display device.
Background technique
Liquid crystal display device (Liquid Crystal Display, abbreviation LCD) is one kind of panel display apparatus, liquid crystal
Display panel and backlight module are important components therein.Specifically, backlight module includes: backlight, liquid crystal display panel packet
Include: gate driving circuit and thin film transistor (TFT) are in its cut-in voltage range to when grid voltage for thin film transistor (TFT)
When, which may turn on, and when grid voltage, which is in it, closes in range, which be may turn off, existing
Have so that the grid voltage that thin film transistor (TFT) is closed is provided by the signal at the low level signal end in gate driving circuit.
Through inventor the study found that the space that liquid crystal display device adjusts back light source brightness at this stage is increasing.
After user is used for a long time, due to being irradiated for a long time by backlight aging occurs for the thin film transistor (TFT) in liquid crystal display panel,
The signal for causing low level signal end to provide can not close thin film transistor (TFT) in time and generate leakage current, and leakage current can cause liquid
The image residue of crystal device, and then influence the display effect of display device.
Summary of the invention
In order to solve the above-mentioned technical problem, the embodiment of the invention provides a kind of backlight module, display panel and display dresses
It sets, the brightness for the light that can be projected by light source assembly adjusts the signal at low level signal end in real time, avoids generating leakage current
Caused by image residue, ensure that the display effect of display device.
In a first aspect, the embodiment of the present invention provides a kind of backlight module, comprising: backboard, light source assembly and setting are in backboard
On printed circuit board, the printed circuit board includes: low level signal generative circuit；
The low level signal generative circuit, the brightness of the light for being projected according to light source assembly generate low level letter
Number.
Optionally, the low level signal generative circuit includes: commutation sub-circuit and generation sub-circuit；
The commutation sub-circuit, connect with signal input part and node respectively, the signal provided for inputting a signal into end
Rectification processing is carried out, to generate voltage regulation signal；
The generation sub-circuit, connect with node and signal output end respectively, for according to the voltage regulation signal and light source
The brightness for the light that component projects generates low level signal.
Optionally, the commutation sub-circuit includes: first capacitor, the second capacitor, third capacitor, first diode, second
Diode and load resistance；
The first end of the first capacitor is connect with signal input part, the first pole connection of second end and first diode；
First pole of the first diode is connect with the second pole of the second diode, and the second pole is connect with node；
Second pole of second diode is connect with ground terminal；
The first end of second capacitor is connect with node, and second end is connect with ground terminal；
The first end of the load resistance is connect with node, and second end is connect with ground terminal；
The first end of the third capacitor is connect with node, and second end is connect with ground terminal.
Optionally, the generation sub-circuit includes: the first load and the second load；
The first end of first load is connect with node, and second end is connect with signal output end；
The first end of second load is connect with signal output end, and second end is connect with ground terminal.
Optionally, it includes: first resistor that the generation sub-circuit, which includes: the first load,；Second load includes: second
Resistance；
At least one in the first resistor and the second resistance is photo resistance.
Optionally, printed wiring board is arranged in close to the side of the backboard in the photo resistance, and on backboard just
It is projected as hollowed out area, so that the light that light source assembly projects is irradiated in photo resistance.
Optionally, the commutation sub-circuit includes: first capacitor, the second capacitor, third capacitor, first diode, second
Diode and load resistance；The generation sub-circuit includes: the first load and the second load；
The first end of the first capacitor is connect with signal input part, the first pole connection of second end and first diode；
First pole of the first diode is connect with the second pole of the second diode, and the second pole is connect with node；
Second pole of second diode is connect with ground terminal；
The first end of second capacitor is connect with node, and second end is connect with ground terminal；
The first end of the load resistance is connect with node, and second end is connect with ground terminal；
The first end of the third capacitor is connect with node, and second end is connect with ground terminal；
The first end of first load is connect with node, and second end is connect with signal output end；
The first end of second load is connect with signal output end, and second end is connect with ground terminal.
Optionally, the input signal of the signal input part is square-wave signal.
Second aspect, the embodiment of the present invention also provide a kind of display panel, comprising: above-mentioned backlight module.
The third aspect, the embodiment of the present invention provide a kind of display device, comprising: above-mentioned display panel.
The embodiment of the present invention provides a kind of backlight module, display panel and display device, wherein backlight module includes: back
Plate, light source assembly and the printed circuit board being arranged on backboard, printed circuit board include: low level signal generative circuit, low electricity
Flat signal generating circuit, the brightness of the light for being projected according to light source assembly generate low level signal.The embodiment of the present invention is logical
The low level signal generative circuit of setting on a printed circuit is crossed, it can be according to the brightness for the light that light source assembly projects come real
When adjustment generate low level signal, to close thin film transistor (TFT) in time, avoid generate leakage current caused by image residue, guarantee
The display effect of display device.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
Attached drawing is used to provide to further understand technical solution of the present invention, and constitutes part of specification, with this
The embodiment of application technical solution for explaining the present invention together, does not constitute the limitation to technical solution of the present invention.
Fig. 1 is the side view of backlight module provided in an embodiment of the present invention；
Fig. 2 is the top view of backlight module provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of low level signal generative circuit provided in an embodiment of the present invention；
Fig. 4 is the equivalent circuit diagram of commutation sub-circuit provided in an embodiment of the present invention；
Fig. 5 is the equivalent circuit diagram provided in an embodiment of the present invention for generating sub-circuit；
Fig. 6 is the top view of backboard provided in an embodiment of the present invention；
Fig. 7 is the equivalent circuit diagram of low level signal generative circuit provided in an embodiment of the present invention；
Fig. 8 is the working state figure of low level signal generative circuit first stage provided in an embodiment of the present invention；
Fig. 9 is the working state figure of low level signal generative circuit second stage provided in an embodiment of the present invention；
Figure 10 is the working timing figure of low level signal generative circuit provided in an embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention
Embodiment be described in detail.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application
Feature can mutual any combination.
Step shown in the flowchart of the accompanying drawings can be in a computer system such as a set of computer executable instructions
It executes.Also, although logical order is shown in flow charts, and it in some cases, can be to be different from herein suitable
Sequence executes shown or described step.
Unless otherwise defined, the embodiment of the present invention discloses the technical term used or scientific term should be institute of the present invention
The ordinary meaning that personage in category field with general technical ability is understood." first ", " second " used in the embodiment of the present invention
And similar word is not offered as any sequence, quantity or importance, and be used only to distinguish different component parts.
The similar word such as " comprising " or "comprising", which means to occur element or object before the word, to be covered to appear in and arranges behind the word
The element of act perhaps object and its equivalent and be not excluded for other elements or object.The similar word such as " connection " or " connected "
Language is not limited to physics or mechanical connection, but may include electrical connection, either direct or indirect
's."upper", "lower", "left", "right" etc. are only used for indicating relative positional relationship, when the absolute position for the object being described changes
Afterwards, then the relative positional relationship may also correspondingly change.
Embodiment one
Fig. 1 is the side view of backlight module provided in an embodiment of the present invention, and Fig. 2 is backlight mould provided in an embodiment of the present invention
The top view of group, as depicted in figs. 1 and 2, backlight module provided in an embodiment of the present invention, comprising: backboard 10,20 and of light source assembly
Printed circuit board 30 on backboard 10 is set, and printed circuit board 30 includes: low level signal generative circuit 31；Low level signal
Generative circuit 31, the brightness of the light for being projected according to light source assembly generate low level signal.
Specifically, backlight module further include: reflector plate, light guide plate, diffusion sheet and prismatic lens (not shown).Wherein,
Light source assembly is used to will reflect back into the part light come and utilizes again, reduce the loss of light, mention for providing incident light, reflector plate
High light utilization efficiency, light guide plate are used for the light-output for emit light source assembly, and diffusion sheet is used for the progress of light derived from light guide plate
Diffusion guarantees the uniform of light, and the light that prismatic lens are used to spread diffusion sheet converges, to improve the brightness of light.
Optionally, backboard 10 can be metal material or other materials, and the embodiment of the present invention is not limited in any way this.
Optionally, light source assembly 20 includes: light emitting diode (Light Emitting Diode, abbreviation LED), alternatively,
Or cathode fluorescent tube (Cold Cathode Fluorescent Lamp, abbreviation CCFL).
Optionally, printed circuit board 30 can use rigid printed circuit board or flexible printed circuit board, and the present invention is real
It applies example and this is not limited in any way.
Backlight module provided in an embodiment of the present invention includes: backboard, light source assembly and the printed circuit being arranged on backboard
Plate, printed circuit board include: low level signal generative circuit, low level signal generative circuit, for being projected according to light source assembly
Light brightness, generate low level signal.The embodiment of the present invention is raw by the low level signal of setting on a printed circuit
At circuit, the brightness for the light that can be projected according to light source assembly is come the real-time low level signal for adjusting generation, to close in time
Thin film transistor (TFT) avoids image residue caused by generating leakage current, ensure that the display effect of display device.
Optionally, Fig. 3 is the structural schematic diagram of low level signal generative circuit provided in an embodiment of the present invention, such as Fig. 3 institute
Show, low level signal generative circuit includes: commutation sub-circuit and generation sub-circuit；Commutation sub-circuit, respectively with signal input part
INPUT is connected with node N, rectification processing is carried out for inputting a signal into the signal that end INPUT is provided, to generate voltage regulation signal；
Sub-circuit is generated, is connect respectively with node N and signal output end OUTPUT, for what is projected according to voltage regulation signal and light source assembly
The brightness of light generates low level signal.
Optionally, the input signal of signal input part INPUT is square-wave signal.
Optionally, Fig. 4 is the equivalent circuit diagram of commutation sub-circuit provided in an embodiment of the present invention, as shown in figure 4, commutator
Circuit includes: first capacitor C1, the second capacitor C2, third capacitor C3, first diode D1, the second diode D2 and load resistance
R。
Specifically, the first end of first capacitor C1 is connect with signal input part INPUT, second end is with first diode D1's
The connection of first pole；The first pole of first diode D1 is connect with the second pole of the second diode D2, and the second pole is connect with node N；
The second pole of second diode D2 is connect with ground terminal GND；The first end of second capacitor C2 is connect with node N, second end with
Ground terminal GND connection；The first end of load resistance R is connect with node N, and second end is connect with ground terminal GND；Third capacitor C3
First end connect with node N, second end is connect with ground terminal GND.
It should be noted that the exemplary structure of commutation sub-circuit has been shown in particular in Fig. 4.Those skilled in the art are easy
Understanding is that the implementation of commutation sub-circuit is without being limited thereto, as long as can be realized its respective function.
Specifically, first capacitor C1, the second capacitor C2, first diode D1, the second diode D2 and load resistance R are suitable
In negative pressure half-wave rectifying circuit, voltage regulation signal is generated for square-wave signal to be carried out rectification processing, and third capacitor C3 is for protecting
Demonstrate,prove the stability of voltage regulation signal.
Optionally, Fig. 5 is the equivalent circuit diagram provided in an embodiment of the present invention for generating sub-circuit, as shown in figure 5, generating son
Circuit includes: the first load and the second load；The first end of first load is connect with node N, second end and signal output end
OUTPUT connection；The first end of second load is connect with signal output end OUTPUT, and second end is connect with ground terminal GND.
As shown in figure 5, the first load includes: first resistor R1, the second load includes: second resistance R2.
Optionally, at least one in first resistor R1 and second resistance R2 is photo resistance, wherein when first resistor R1 is
When photo resistance, second resistance R2 can be photo resistance, can also be fixed value resistance, when second resistance R2 is photo resistance
When, it can also be fixed value resistance that first resistor R1, which can be photo resistance, and the embodiment of the present invention does not do any restriction to this.
Optionally, side of the printed wiring board close to backboard is arranged in photo resistance, and the orthographic projection on backboard is to engrave
Empty region, so that the light of the injection of light source assembly is irradiated in photo resistance, Fig. 6 is backboard provided in an embodiment of the present invention
Top view, as shown in fig. 6, on backboard position 11 corresponding with photo resistance be hollowed out area.
It should be noted that the shape of hollowed out area can be white space, it can also be to be latticed etc., as long as light source group
The light that part projects can be irradiated to photo resistance, and the embodiment of the present invention is not limited in any way this.
It should be noted that the exemplary structure for generating sub-circuit has been shown in particular in Fig. 5.Those skilled in the art are easy
Understanding be generate sub-circuit implementation it is without being limited thereto, as long as can be realized its respective function.
Specifically, the photo resistance in the embodiment of the present invention receives the light that light source assembly projects and is sampled, and will
Change in resistance of the change transitions of different brightness at photo resistance, and then the output signal of adjustment signal output end OUTPUT.
Assuming that the voltage of node N is VN, the voltage of the output signal of signal output end OUTPUT is VGL, first resistor
Resistance value is R1, the resistance value of second resistance is R2, wherein VNFor definite value, VGL meets formula VGL=VN/(1+R2/R1), VGL needs
Equal to the voltage of shutdown signal needed for thin film transistor (TFT).It should be noted that the electricity of shutdown signal needed for thin film transistor (TFT)
Press the thin film transistor (TFT) specific curves and thin film transistor (TFT) of pre-stored corresponding different illumination intensity according to the display device
Threshold voltage determine, when known to intensity of illumination, the voltage of shutdown signal needed for needing thin film transistor (TFT) it is also known that.
Work as VNIt for -18V, is increased in light source assembly brightness, and when its intensity of illumination is E1, according to corresponding different illumination intensity
Thin film transistor (TFT) specific curves and thin film transistor (TFT) threshold voltage known to shutdown signal needed for thin film transistor (TFT) voltage
For -15V, as long as at this point, the resistance value ratio of two resistance meets R2/R1=0.2, VGL are equal to -15V；It is dropped in light source assembly brightness
It is low, and when intensity of illumination is E2, it is thin according to the thin film transistor (TFT) specific curves of corresponding different illumination intensity and threshold voltage
The voltage of shutdown signal needed for film transistor is -10V, as long as at this point, the resistance value ratio of two resistance meets R2/R1=0.8, VGL
It is equal to -10V.
When display device completes, needed for the thin film transistor (TFT) under the voltage of node N and a certain intensity of illumination
The voltage of shutdown signal is definite value, and the corresponding relationship between the intensity of illumination and resistance of photo resistance also determines.Specifically, aobvious
The photo resistance being arranged in showing device needs the specific song of thin film transistor (TFT) of the correspondence different illumination intensity according to thin film transistor (TFT)
Line, the threshold voltage of thin film transistor (TFT) and formula VGL=VN/(1+R2/R1) selection, the intensity of illumination of the photo resistance of selection
Corresponding relationship between resistance should can satisfy when intensity of illumination is E, the output signal of signal output end OUTPUT
Voltage is equal to intensity of illumination when being E, according to the thin film transistor (TFT) specific curves and thin film transistor (TFT) of corresponding different illumination intensity
Threshold voltage determine thin film transistor (TFT) needed for shutdown signal voltage.For by taking above-mentioned example as an example, photo resistance
Corresponding relationship needs to meet between resistance between intensity of illumination: when intensity of illumination is E1, the resistance value of second resistance R2 meets
R2=0.2R1, when intensity of illumination is E2, the resistance value R of second resistance R22=0.8R1。
In addition, it is necessary to explanation, increase of the photo resistance with intensity of illumination, the resistance decrease of photo resistance.
Specifically, the voltage of shutdown signal needed for thin film transistor (TFT) is that -10V or -15V expression is applied to thin film transistor (TFT)
The voltage of signal of grid when being -10V or -15V, thin film transistor (TFT) is closed, and thin film transistor (TFT) will not just generate leakage current；Instead
It, if be applied to the voltage of the grid of thin film transistor (TFT) lower than -10V or -15V, thin film transistor (TFT) can not be closed, that is,
It says, thin film transistor (TFT) is still in open state, at this point, thin film transistor (TFT) will generate leakage current.
It should be noted that whether thin film transistor (TFT) generates the liquid crystal molecule that leakage current influences whether liquid crystal display panel
Deflection, specifically, the voltage for the pixel electrode connecting with thin film transistor (TFT) drain electrode is just when thin film transistor (TFT) does not generate leakage current
It is unaffected, the deflection state of the liquid crystal molecule in liquid crystal display panel is unaffected, and can reach realization
The optimum deflection angle of display effect, and then guarantee display effect.When thin film transistor (TFT) generates leakage current, with thin film transistor (TFT) leakage
The voltage of the pixel electrode of electrode connection will be affected, so that the liquid crystal molecule generation being located in liquid crystal display panel is endless
Full-scale deflection, and then cause the image residue of liquid crystal display device.
Specifically, the voltage of shutdown signal needed for thin film transistor (TFT) is related with the brightness of light source assembly, light source assembly
Brightness is higher, and the voltage magnitude of shutdown signal needed for thin film transistor (TFT) is bigger, and the brightness of light source assembly is higher, thin film transistor (TFT)
The voltage magnitude of required shutdown signal is smaller.It should be noted that leakage of the thin film transistor (TFT) since generation can not be closed in time
The size of electric current and the brightness of light source assembly are unrelated, and the signal connecting with thin film transistor source drain is related.
In addition, Fig. 7 is the equivalent circuit diagram of low level signal generative circuit provided in an embodiment of the present invention, as shown in fig. 7,
Commutation sub-circuit includes: first capacitor C1, the second capacitor C2, third capacitor C3, first diode D1, the second diode D2 and bears
Carry resistance R；Generating sub-circuit includes: the first load and the second load.
Specifically, the first end of first capacitor C1 is connect with signal input part INPUT, second end is with first diode D1's
The connection of first pole；The first pole of first diode D1 is connect with the second pole of the second diode D2, and the second pole is connect with node N；
The second pole of second diode D2 is connect with ground terminal GND；The first end of second capacitor C2 is connect with node N, second end with
Ground terminal GND connection；The first end of load resistance R is connect with node N, and second end is connect with ground terminal GND；Third capacitor C3
First end connect with node N, second end is connect with ground terminal GND；The first end of first load is connect with node N, the
Two ends are connect with signal output end OUTPUT；Second load first end connect with signal output end OUTPUT, second end and
Ground terminal GND connection.
Below by the course of work technology that the embodiment of the present invention will be further explained provides of low level signal generative circuit
Scheme.
Fig. 8 is the working state figure of low level signal generative circuit first stage provided in an embodiment of the present invention, and Fig. 9 is this
The working state figure for the low level signal generative circuit second stage that inventive embodiments provide, Figure 10 provide for the embodiment of the present invention
Low level signal generative circuit working timing figure, as shown in Fig. 7~10, low level signal provided in an embodiment of the present invention is raw
It include 2 diodes (D1 and D2), 3 capacitors (C1, C2 and C3), 3 resistance (R, R1 and R2), 1 signal input at circuit
Hold (INPUT), 1 signal output end (OUTPUT) and 1 ground terminal (GND).
Wherein, the input signal of signal input part INPUT is the square-wave signal that amplitude is positive value.
It is specific:
The input signal of first stage T1, signal input part INPUT are high level, and the input of signal input part INPUT is believed
Number it is coupled to the cathode of first diode D1 by first capacitor C1, since the input signal of signal input part INPUT is high electricity
Flat, first diode D1 is in reverse bias and ends, and the second diode D2 is in forward bias and is connected, signal input part
The input signal of INPUT constitutes circuit through first capacitor C1 and the second diode D2, and charges to first capacitor C1, at this point, the
Voltage of the one capacitor C1 close to one end of signal input part INPUT is higher than one of first capacitor C1 far from signal input part INPUT
The voltage at end, current direction are as shown in Figure 8.
The input signal of second stage T2, signal input part INPUT are low level, since first capacitor C1 electric discharge can not dash forward
Become, at this point, the voltage of the one end of first capacitor C1 far from signal input part INPUT is less than first capacitor C1 close to signal input part
The voltage of one end of INPUT, the second diode D2 are in reverse bias and end, and first diode D1 is in forward bias and leads
Logical, at this point, first capacitor C1 is rectified by first diode D1, the second capacitor C2 filtering obtains the pressure stabilizing that voltage is negative voltage
Signal, current direction is as shown in figure 9, at this point, the photo resistance reception light source assembly in first resistor R1 and second resistance R2 is penetrated
Light out is simultaneously sampled, and by the change transitions of different brightness at the change in resistance of photo resistance, and then adjustment signal is defeated
The output signal of outlet OUTPUT enables the output signal of signal output end OUTPUT to close thin film transistor (TFT).
It should be noted that output signal is sampled through load resistance R, after internal circuit is handled, output signal is controlled
The duty ratio of pulse realizes pressure stabilizing, and voltage regulation signal can be obtained in the repetition above stage.
Embodiment two
Inventive concept based on the above embodiment, the embodiment of the present invention also provide a kind of display panel, the display panel packet
It includes: backlight module and display base plate.
Wherein, display panel is liquid crystal display panel, and the light emission side of backlight module is arranged in display panel.Specifically, this
The backlight module that inventive embodiments provide is used to provide backlight for display panel, and the illumination effect of backlight module directly influences aobvious
Show the display effect of mould group.It should be noted that backlight module can be side entering type, it can also be straight-down negative, the present invention is implemented
Example is not limited thereto.
Wherein, backlight module is the backlight module that embodiment one provides, and realization principle is similar with effect is realized, herein not
It repeats again.
Embodiment three
Inventive concept based on the above embodiment, the embodiment of the present invention also provide a kind of display device, the display device packet
It includes: display panel.
Specifically, display device is liquid crystal display device, optionally, which can be with are as follows: mobile phone, tablet computer,
Any products or components having a display function such as television set, display, laptop, Digital Frame, navigator.
Attached drawing of the embodiment of the present invention is pertained only to the present embodiments relate to the structure arrived, and other structures, which can refer to, usually to be set
Meter.
For clarity, in the attached drawing of embodiment for describing the present invention, the thickness and size of layer or micro-structure
It is amplified.It is appreciated that ought such as layer, film, region or substrate etc element be referred to as be located at another element "above" or "below"
When, which " direct " can be located at "above" or "below" another element, or may exist intermediary element.
In the absence of conflict, the feature in the embodiment of the present invention, that is, embodiment can be combined with each other new to obtain
Embodiment.
Although disclosed herein embodiment it is as above, the content only for ease of understanding the present invention and use
Embodiment is not intended to limit the invention.Technical staff in any fields of the present invention is taken off not departing from the present invention
Under the premise of the spirit and scope of dew, any modification and variation, but the present invention can be carried out in the form and details of implementation
Scope of patent protection, still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
1. a kind of backlight module characterized by comprising backboard, light source assembly and the printed circuit board being arranged on backboard, institute
Stating printed circuit board includes: low level signal generative circuit；
The low level signal generative circuit, the brightness of the light for being projected according to light source assembly generate low level signal.
2. backlight module according to claim 1, which is characterized in that the low level signal generative circuit includes: rectification
Sub-circuit and generation sub-circuit；
The commutation sub-circuit is connect with signal input part, node and ground terminal respectively, the letter provided for inputting a signal into end
Number rectification processing is carried out, to generate voltage regulation signal；
The generation sub-circuit, connect with node, signal output end and ground terminal respectively, for according to the voltage regulation signal and light
The brightness for the light that source component projects generates low level signal.
3. backlight module according to claim 2, which is characterized in that the commutation sub-circuit includes: first capacitor, second
Capacitor, third capacitor, first diode, the second diode and load resistance；
The first end of the first capacitor is connect with signal input part, the first pole connection of second end and first diode；
First pole of the first diode is connect with the second pole of the second diode, and the second pole is connect with node；
Second pole of second diode is connect with ground terminal；
The first end of second capacitor is connect with node, and second end is connect with ground terminal；
The first end of the load resistance is connect with node, and second end is connect with ground terminal；
The first end of the third capacitor is connect with node, and second end is connect with ground terminal.
4. backlight module according to claim 2, which is characterized in that the generation sub-circuit includes: the first load and
Two loads；
The first end of first load is connect with node, and second end is connect with signal output end；
The first end of second load is connect with signal output end, and second end is connect with ground terminal.
5. backlight module according to claim 4, which is characterized in that first load includes: first resistor；Described
Two loads include: second resistance；
At least one in the first resistor and the second resistance is photo resistance.
6. backlight module according to claim 5, which is characterized in that the photo resistance setting is close in printed wiring board
The side of the backboard, and the orthographic projection on backboard is hollowed out area, so that the light that light source assembly projects is irradiated to light
On quick resistance.
7. according to the described in any item backlight modules of claim 2~5, which is characterized in that the commutation sub-circuit includes: first
Capacitor, the second capacitor, third capacitor, first diode, the second diode and load resistance；The generation sub-circuit includes:
One load and the second load；
The first end of the first capacitor is connect with signal input part, the first pole connection of second end and first diode；
First pole of the first diode is connect with the second pole of the second diode, and the second pole is connect with node；
Second pole of second diode is connect with ground terminal；
The first end of second capacitor is connect with node, and second end is connect with ground terminal；
The first end of the load resistance is connect with node, and second end is connect with ground terminal；
The first end of the third capacitor is connect with node, and second end is connect with ground terminal；
The first end of first load is connect with node, and second end is connect with signal output end；
The first end of second load is connect with signal output end, and second end is connect with ground terminal.
8. backlight module according to claim 2, which is characterized in that the input signal of the signal input part is square wave letter
Number.
9. a kind of display panel characterized by comprising backlight module as described in any one of claims 1 to 8.
10. a kind of display device characterized by comprising display panel as claimed in claim 9.
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| CN114242012A (en) * | 2021-12-15 | 2022-03-25 | Tcl华星光电技术有限公司 | Backlight module, display panel, display control method of display panel and display device |
| US11889600B2 (en) | 2021-12-15 | 2024-01-30 | Tcl China Star Optoelectronics Technology Co., Ltd. | Backlight module, display panel and display control method thereof, and display device |
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| CN109243377B (en) | 2020-05-01 |
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