CN107146582B - Backlight driver and its driving method - Google Patents
Backlight driver and its driving method Download PDFInfo
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- CN107146582B CN107146582B CN201710446053.XA CN201710446053A CN107146582B CN 107146582 B CN107146582 B CN 107146582B CN 201710446053 A CN201710446053 A CN 201710446053A CN 107146582 B CN107146582 B CN 107146582B
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- signal
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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
-
- 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
- G09G3/36—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 using liquid crystals
Abstract
The invention discloses a kind of backlight drivers, comprising: signal detection module, for detecting the first switch frequency and duty ratio of externally input first pulse-width signal；Second pulse-width signal for generating the second pulse-width signal of an output according to preset switches frequency and the duty ratio of the first pulse-width signal, and is sent to back light unit by signal generating module.The present invention also provides a kind of methods for driving backlight driver, externally input PWM1 signal is converted into the PWM2 signal with display panel respective frequencies, it prevents when display panel collocation system is shown, cause the flashing of display panel because the switching frequency of pwm signal is coupled with common voltage waveform, improves the quality of display panel.
Description
Technical field
The invention belongs to display apparatus test fields, more particularly, to a kind of backlight driver and its driving method.
Background technique
Since liquid crystal display device has many advantages, such as frivolous, energy saving, low-power consumption, TV, computer, hand have been widely used in it
In the electronic equipments such as machine, digital camera.
For refractive index, dielectric constant etc., liquid crystal has anisotropic characteristic, and liquid crystal display device uses the electricity of liquid crystal
And optical characteristics, show image by picture element matrix.Each pixel of liquid crystal display device is by using liquid crystal aligning direction
The optical transmittance relative to polarizing film is adjusted according to the variation of data-signal, realizes gray level.Fig. 1 shows the prior art
The structural schematic diagram of middle display device, as shown in Figure 1, display device 100 includes for showing the aobvious of image by picture element matrix
Show panel 10, the driving circuit 20 for driving display panel 10, for display panel irradiation light back light unit 30, be used for
Drive backlight driver 40, the sequence controller 50 for controlling driving circuit 20 of back light unit 30.
Wherein, the driving circuit 20 includes the data driver 22 and gate drivers 24 for driving display panel.
Backlight driver 40 for driving back light unit passes through according to the pulsewidth inputted from host or sequence controller 50
The ON/OFF time for modulating the duty ratio adjustment back light unit of (PWM) signal, control the brightness of back light unit.
However, the frequency range of the corresponding pwm signal of different display panels is different.When input pwm signal frequency not
The display panel for pwm signal frequency range in when, cause to show due to pwm signal is coupled with common voltage waveform
The flashing of panel.
Summary of the invention
The purpose of the present invention is to provide a kind of backlight driver and its driving methods.
According to an aspect of the present invention, a kind of backlight driver is provided, comprising:
Signal detection module, for detecting the first switch frequency and duty of externally input first pulse-width signal
Than；
Signal generating module, it is defeated for generating one according to preset switches frequency and the duty ratio of the first pulse-width signal
The second pulse-width signal out, and second pulse-width signal is sent to back light unit.
Preferably, the second switch frequency of second pulse-width signal is preset switches frequency.
Preferably, the preset switches frequency is different from the first switch frequency.
Preferably, the signal detection module includes:
Signal sampling unit, first switch period and first for detecting externally input first pulse-width signal lead
The logical time；
Detecting signal unit, for according to first pulse-width signal the first switch period and the first turn-on time
Determine the first switch frequency and duty ratio of first pulse-width signal.
Preferably, the signal generating module includes:
Signal processing unit, for determining second according to the duty ratio of preset switches frequency and the first pulse-width signal
The second switch period of pulse-width signal and the second turn-on time；
Signal generating unit, for according to the second switch period of the second pulse-width signal and the generation of the second turn-on time
Second pulse-width signal.
Preferably, the backlight driver further include:
Judgment module, for judging whether the first switch frequency meets base condition.
Preferably, when the frequency of first pulse-width signal meets base condition, by first pulsewidth modulation
Signal is sent to back light unit.
According to another aspect of the present invention, a kind of method driving backlight driver is provided, comprising:
Detect the first switch frequency and duty ratio of externally input first pulse-width signal；
The second pulsewidth modulation of an output is generated according to preset switches frequency and the duty ratio of the first pulse-width signal
Signal, and second pulse-width signal is sent to back light unit.
Preferably, the method for the driving backlight driver further include:
Judge whether the first switch frequency meets base condition.
Preferably, the method for backlight driver is driven further include:
When the frequency of first pulse-width signal meets base condition, first pulse-width signal is sent
To back light unit.
Externally input PWM1 signal is converted into having and be shown by backlight driver and its driving method provided by the invention
The PWM2 signal for showing panel respective frequencies is prevented when display panel collocation system is shown, because of the switching frequency of pwm signal
The flashing for coupling and causing display panel with common voltage waveform improves the quality of display panel.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from, in the accompanying drawings:
Fig. 1 shows the schematic block diagram of display device according to prior art；
Fig. 2 shows the schematic block diagrams of the display device of backlight driver according to an embodiment of the invention；
Fig. 3 shows the block diagram of the internal structure of backlight driver shown in Fig. 2；
Fig. 4 shows the schematic block diagram of the display device of backlight driver according to a second embodiment of the present invention；
Fig. 5 shows the block diagram of the internal structure of backlight driver shown in Fig. 4；
Fig. 6 shows backlight driver shown in Fig. 3 and Fig. 5 for changing the method for frequency；
Fig. 7 shows the flow chart of the method for driving backlight driver according to a first embodiment of the present invention；
Fig. 8 shows the flow chart of the method for driving backlight driver according to a second embodiment of the present invention.
Specific embodiment
The various embodiments that the present invention will be described in more detail that hereinafter reference will be made to the drawings.In various figures, identical element
It is indicated using same or similar appended drawing reference.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.
The present invention can be presented in a variety of manners, some of them example explained below.
Fig. 2 shows the schematic block diagrams of the display device of offer according to a first embodiment of the present invention.As shown in Fig. 2, institute
State display device include display panel 10, driving circuit 20, back light unit 30, backlight driver 40, sequence controller 50 and
Host 60.
Wherein, the driving circuit 20 includes the data driver 22 and gate drivers 24 for driving display panel.
Data driver 22 is used to drive the data line on the thin film transistor (TFT) tft array for being formed in display panel 10, gate drivers
24 for driving the grid line on the tft array being formed on display panel 10.
Host 60 scales the image data inputted from external data source according to the resolution ratio of display panel, and by the image
Data are supplied to sequence controller 50 together with multiple synchronization signals.The multiple synchronization signal includes at least Dot Clock sum number
It according to enable signal, and further comprise horizontal synchronizing signal and vertical synchronizing signal.In addition, host 60 to backlight driver 40 or
Person provides the first pulsewidth modulation (PWM1) signal with duty ratio to backlight driver 40 by sequence controller 50, described to account for
Empty ratio presets according to design value or is configured according to user's brightness adjustment.
Sequence controller 50 is corrected using the data processing method of various offer picture qualities and reduction power consumption from host 60
The data of input, to provide data-signal to data driver 22.
In addition, sequence controller 50 is generated using the multiple synchronization signals inputted from host 60 for controlling data-driven
The data controlling signal of 22 driver' s timing of device and grid control signal for controlling 24 driver' s timing of gate drivers.Data control
Signal processed includes source electrode initial pulse for controlling latch data signals and source electrode sampling clock, for controlling data-signal pole
Property polarity control signal, the source output enable signal etc. in output period for controlling data-signal.Grid control signal
Including for controlling grid signal scanning grid initial pulse signal and gate shift clock, for controlling the defeated of grid signal
The grid output enable signal etc. in period out.
Data driver 22 is in response to the data controlling signal from sequence controller 50, by image data from timing control
Device 50 is supplied to the multiple data lines of display panel 10.Grid control signal of the gate drivers 24 in response to sequence controller 50
Successively drive the grid line of display panel 10.
Full run-down type or edge type backlight can be used as light source in back light unit 50.Staight downward type backlight includes facing display surface
Plate 10 bottom surface arrangement light source on the complete display area and multiple optical sheets for being arranged on light source, Staight downward type backlight
It configures in the following manner, i.e., is irradiated to display panel 10 by multiple optical sheets from the light that light source emits.Edge type backlight includes
In face of the bottom surface of display panel 10 light guide plate, be arranged in face of light guide plate at least one edge light source and setting
Multiple optical sheets on light guide plate, edge type backlight configure in the following manner, i.e., are converted to area source from the light that light source emits
Light and be irradiated to display panel 10 by multiple optical sheets.
Backlight driver 40 is in response to the first pulsewidth modulation (PWM1) signal from host 60 or the input of sequence controller 50
Duty ratio, and the first pulsewidth modulation (PWM1) signal is converted into and matched second pulsewidth modulation (PWM2) of display panel 10
Signal, to drive back light unit 30 and control the brightness of back light unit 30.When back light unit 30 be divided into multiple regions into
When row driving, multiple backlight drivers 30 can be used that the multiple region is operated alone.
Fig. 3 shows the internal structure block diagram of backlight driver 40 described in Fig. 2.Fig. 6 shows the drive of backlight shown in Fig. 3
Device is moved for changing the method for frequency.
The backlight driver 40 includes signal detection module 41 and signal generating module 42.
Wherein, the signal detection module 41 is for detecting the first of externally input first pulsewidth modulation (PWM1) signal
Switching frequency F1 and duty ratio D.
In the present embodiment, signal detection module 41 to PWM1 signal sampling and counts, to detect the first switch of PWM1
Frequency F1 and duty ratio D.
Further, the signal detection module 41 includes: signal sampling unit 411, for detecting externally input
The first switch period of one pulse-width signal and the first turn-on time；Detecting signal unit 412, for according to first arteries and veins
The first switch period of wide modulated signal and the first turn-on time determine the first switch frequency of first pulse-width signal
And duty ratio.
Signal sampling unit 411 detects the rising edge of PWM1 signal, and starts timing, under first since rising edge
Drop is denoted as the first turn-on time t1 along the time terminated, is denoted as since the first rising edge to the time that second rising edge terminates
The frequency F1=1/T1 of PWM1 signal then can be obtained in first switch cycle T 1.
Detecting signal unit 412 detects the first obtained turn-on time t1 and first switch period according to using unit 411
T1 determines duty ratio D=t1/T1.
The signal generating module 42 is used for accounting for according to preset switches frequency and the first pulsewidth modulation (PWM1) signal
Second pulsewidth modulation (PWM2) signal is sent to back than generating the second pulsewidth modulation (PWM2) signal of an output by sky
Light unit 30.
Further, the signal generating module 42 includes: signal processing unit 421, for according to preset switches frequency
The duty ratio D of F2 and the first pulse-width signal determines the second switch cycle T 2 and the second conducting of the second pulse-width signal
Time t2；Signal generating unit 422, for the second switch cycle T 2 and the second turn-on time according to the second pulse-width signal
T2 generates the second pulse-width signal.
Preset switches frequency F is converted into second switch cycle T 2, i.e. T2=1/F by signal processing unit 421；The of PWM2
Two turn-on time t2 are the time that first rising edge of PWM2 signal terminates to first failing edge, i.e. t2=D*T2.Signal
Transmission unit 422 generates PWM2 signal according to second switch cycle T 2 and the second turn-on time t2.
In the present embodiment, the second switch frequency F2 of second pulse-width signal is preset switches frequency F.It is described
Preset switches frequency F is different from the first switch frequency F1.
Fig. 7 shows the flow chart of the method for the driving backlight driver provided according to a first embodiment of the present invention.Such as Fig. 7
It is shown, it the described method comprises the following steps.
In step S01, the first switch frequency and duty ratio of externally input first pulse-width signal are detected.
In step S02, an output is generated according to preset switches frequency and the duty ratio of the first pulse-width signal
Second pulse-width signal, and second pulse-width signal is sent to back light unit.
Externally input PWM1 signal is converted into having and be shown by backlight driver and its driving method provided by the invention
The PWM2 signal for showing panel respective frequencies is prevented when display panel collocation system is shown, because of the switching frequency of pwm signal
The flashing for coupling and causing display panel with common voltage waveform improves the quality of display panel.
Fig. 4 shows the schematic block diagram of the display device provided according to a second embodiment of the present invention.As shown in figure 4, institute
State display device include display panel 10, driving circuit 20, back light unit 30, backlight driver 40, sequence controller 50 and
Host 60.Compared with first embodiment, the internal structure of backlight driver 40 increases judgment module 43.
Fig. 5 shows the internal structure block diagram of backlight driver 40 described in Fig. 2.Fig. 6 shows the drive of backlight shown in Fig. 5
Device is moved for changing the method for frequency.
The backlight driver 40 includes signal detection module 41, signal generating module 42 and judgment module 43.
Wherein, the signal detection module 41 is for detecting the first of externally input first pulsewidth modulation (PWM1) signal
Switching frequency F1 and duty ratio D.
In the present embodiment, signal detection module 41 to PWM1 signal sampling and counts, to detect the first switch of PWM1
Frequency F1 and duty ratio D.
Further, the signal detection module 41 includes: signal sampling unit 411, for detecting externally input
The first switch period of one pulse-width signal and the first turn-on time；Detecting signal unit 412, for according to first arteries and veins
The first switch period of wide modulated signal and the first turn-on time determine the first switch frequency of first pulse-width signal
And duty ratio.
Signal sampling unit 411 detects the rising edge of PWM1 signal, and starts timing, under first since rising edge
Drop is denoted as the first turn-on time t1 along the time terminated, is denoted as since the first rising edge to the time that second rising edge terminates
The frequency F1=1/T1 of PWM1 signal then can be obtained in first switch cycle T 1.
Detecting signal unit 412 detects the first obtained turn-on time t1 and first switch period according to using unit 411
T1 determines duty ratio D=t1/T1.
The signal generating module 42 is used for accounting for according to preset switches frequency and the first pulsewidth modulation (PWM1) signal
Second pulsewidth modulation (PWM2) signal is sent to back than generating the second pulsewidth modulation (PWM2) signal of an output by sky
Light unit 30.
Further, the signal generating module 42 includes: signal processing unit 421, for according to preset switches frequency
The duty ratio D of F2 and the first pulse-width signal determines the second switch cycle T 2 and the second conducting of the second pulse-width signal
Time t2；Signal generating unit 422, for the second switch cycle T 2 and the second turn-on time according to the second pulse-width signal
T2 generates the second pulse-width signal.
Preset switches frequency F is converted into second switch cycle T 2, i.e. T2=1/F by signal processing unit 421；The of PWM2
Two turn-on time t2 are the time that first rising edge of PWM2 signal terminates to first failing edge, i.e. t2=D*T2.Signal
Transmission unit 422 generates PWM2 signal according to second switch cycle T 2 and the second turn-on time t2.
In the present embodiment, the second switch frequency F2 of second pulse-width signal is preset switches frequency F.It is described
Preset switches frequency F is different from the first switch frequency F1.
Judgment module 43 is for judging whether the first switch frequency meets base condition, when the first switch frequency
When meeting base condition, first pulse-width signal is sent to back light unit 30.
In the present embodiment, the base condition is the switching frequency range (Fmin, Fmax) of pwm signal.It opens when first
Close frequency F1 be located at switching frequency range (Fmin, Fmax) it is interior when, PWM1 signal is sent to back light unit 30.Work as first switch
Frequency F1 be not located at switching frequency range (Fmin, Fmax) it is interior when, by PWM1 signal via signal generating module 42 generate PWM2
Signal is sent to back light unit 30.
Fig. 8 shows the flow chart of the method for the driving backlight driver provided according to a first embodiment of the present invention.Such as Fig. 7
It is shown, it the described method comprises the following steps.
In step S01, the first switch frequency and duty ratio of externally input first pulse-width signal are detected.
In step S02, judge whether the first switch frequency meets base condition；When the first switch frequency is full
When sufficient base condition, step S03 is executed；Otherwise, step S04 is executed.
In step S03, first pulse-width signal is sent to back light unit.
In step S04, an output is generated according to preset switches frequency and the duty ratio of the first pulse-width signal
Second pulse-width signal, and second pulse-width signal is sent to back light unit.
Externally input PWM1 signal is converted into having and be shown by backlight driver and its driving method provided by the invention
The PWM2 signal for showing panel respective frequencies is prevented when display panel collocation system is shown, because of the switching frequency of pwm signal
The flashing for coupling and causing display panel with common voltage waveform improves the quality of display panel.
It is as described above according to the embodiment of the present invention, these embodiments details all there is no detailed descriptionthe, also not
Limiting the invention is only the specific embodiment.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is principle and practical application in order to better explain the present invention, thus belonging to making
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.Protection model of the invention
The range that the claims in the present invention are defined should be subject to by enclosing.
Claims (8)
1. a kind of backlight driver characterized by comprising
Signal detection module, for detecting the first switch frequency and duty ratio of externally input first pulse-width signal；
Signal generating module, for generating an output according to preset switches frequency and the duty ratio of the first pulse-width signal
Second pulse-width signal, and second pulse-width signal is sent to back light unit；
Wherein, the second switch frequency of second pulse-width signal is preset switches frequency；
The preset switches frequency is different from the first switch frequency；
The duty ratio of first pulse-width signal is identical with the duty ratio of the second pulse-width signal.
2. backlight driver according to claim 1, which is characterized in that the signal detection module includes:
Signal sampling unit, when for detecting first switch period and the first conducting of externally input first pulse-width signal
Between；
Detecting signal unit, for being determined according to the first switch period of first pulse-width signal and the first turn-on time
The first switch frequency and duty ratio of first pulse-width signal.
3. backlight driver according to claim 1, which is characterized in that the signal generating module includes:
Signal processing unit, for determining the second pulsewidth according to the duty ratio of preset switches frequency and the first pulse-width signal
The second switch period of modulated signal and the second turn-on time；
Signal generating unit, for generating second according to the second switch period of the second pulse-width signal and the second turn-on time
Pulse-width signal.
4. backlight driver according to claim 1, which is characterized in that further include:
Judgment module, for judging whether the first switch frequency meets base condition.
5. backlight driver according to claim 4, which is characterized in that when the frequency of first pulse-width signal is full
When sufficient base condition, first pulse-width signal is sent to back light unit.
6. a kind of method for driving backlight driver, comprising:
Detect the first switch frequency and duty ratio of externally input first pulse-width signal；
The second pulse-width signal of an output is generated according to preset switches frequency and the duty ratio of the first pulse-width signal,
And second pulse-width signal is sent to back light unit；
Wherein, the second switch frequency of second pulse-width signal is preset switches frequency；
The preset switches frequency is different from the first switch frequency；
The duty ratio of first pulse-width signal is identical with the duty ratio of the second pulse-width signal.
7. according to the method described in claim 6, it is characterized by further comprising:
Judge whether the first switch frequency meets base condition.
8. the method according to the description of claim 7 is characterized in that further include:
When the frequency of first pulse-width signal meets base condition, first pulse-width signal is sent to back
Light unit.
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| CN110767180B (en) * | 2019-10-12 | 2020-12-01 | 昆山龙腾光电股份有限公司 | Backlight adjusting circuit and dimming method thereof |
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