CN105913809B - A kind of device and method of adjustment liquid crystal module group backlight brightness - Google Patents
A kind of device and method of adjustment liquid crystal module group backlight brightness Download PDFInfo
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- CN105913809B CN105913809B CN201610371193.0A CN201610371193A CN105913809B CN 105913809 B CN105913809 B CN 105913809B CN 201610371193 A CN201610371193 A CN 201610371193A CN 105913809 B CN105913809 B CN 105913809B
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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
Abstract
The invention discloses a kind of device and method of adjustment liquid crystal module group backlight brightness, which includes that module and a pwm signal generation module occur for the random waveform being set in a programmable logic device；The random waveform occurs module and is used to Wave data generating free voltage Wave data signal；The pwm signal generation module is used to generate PWM voltage drive signals according to the full scale output voltage value Vr of the pwm signal generation module and the waveform voltage output valve Vo of the free voltage Wave data signal, wherein, duty ratio σ=Vo/Vr of the PWM voltage drive signals.The present invention directly drives liquid crystal module by free voltage waveform signal, can realize the display effects such as backlight illumination gradual change, the breathing flicker of liquid crystal module and preset.
Description
Technical field
The present invention relates to liquid crystal module group backlight actuation techniques fields, and in particular to a kind of to use free voltage waveform signal tune
The device and method of whole liquid crystal module group backlight brightness.
Background technology
The technical solution of existing liquid crystal module group backlight brightness regulation generally uses fixed driving voltage amplitude and adjustment liquid
The PWM modulation mode of brilliant module group backlight IC switching frequencies reaches control by changing the pulse width in each switch motion period
The purpose of liquid crystal module group backlight brightness processed.As high-quality, diversified display demand is continuously improved in people, to liquid crystal module
Image display quality and backlight adjusting propose new requirement, module producing line needs specific backlight illumination gradual change, breathing to dodge
The display quality of the display effects detection liquid crystal module such as bright and the driving effect of backlight IC, and existing liquid crystal module group backlight brightness
The technical solution of adjusting can not achieve the display effects such as the backlight illumination gradual change of liquid crystal module, breathing flicker.
Invention content
In view of the above shortcomings of the prior art, the present invention disclose it is a kind of adjustment liquid crystal module group backlight brightness device and side
Method directly drives liquid crystal module by free voltage waveform signal, can realize backlight illumination gradual change, the breathing flicker of liquid crystal module
Etc. display effects and default.
To achieve the above object, the present invention provides a kind of device of adjustment liquid crystal module group backlight brightness, including is set to one
Module and a pwm signal generation module occur for the random waveform in programmable logic device；
The random waveform occurs module and is used to Wave data generating free voltage Wave data signal；
The pwm signal generation module is used for according to the full scale output voltage value Vr of the pwm signal generation module and this
The waveform voltage output valve Vo of meaning voltage waveform data signal generates PWM voltage drive signals, wherein PWM voltages driving letter
Number duty ratio σ=Vo/Vr.
As further alternative technical solution, which believes for multistage voltage Wave data
Number, which includes exponent number M and waveform voltage output valve Vo corresponding with exponent number M, cycle T 1, cycle-index N, jumps
Turn address addr.
As further alternative technical solution, which believes for ramp voltage waveform data
Number, which includes starting voltage value Vs, end voltage value Ve, cycle T 2；
The ramp voltage waveform data-signal includes upward slope voltage waveform data signal and falling rarnp Wave data signal；
Waveform voltage output valve Vo=Vos+ (Ve-Vs)/T2 of the upward slope voltage waveform data signal；The falling rarnp wave
Waveform voltage output valve Vo=Vos- (Vs-Ve)/T2 of graphic data signal；Wherein, Vos is the waveform electricity of a upper system clock
Press output valve.
As further alternative technical solution, the device of the adjustment liquid crystal module group backlight brightness further includes data storage
Module, the programmable logic device are additionally provided with a data storage control module；The data memory module is for storing the waveform
Data；The data storage control module is used to control the read-write of the data memory module.
As further alternative technical solution, which is additionally provided with a Data Input Interface module,
The Data Input Interface module is for receiving the Wave data from host computer or external data processing unit and being deposited by the data
Storage control module is written to the data memory module, which is additionally operable to from the host computer or the external data
It is arbitrary that processing unit reception control instruction and the Wave data that the data memory module is read according to the control instruction generate this
Voltage waveform data signal.
As further alternative technical solution, which is to be set to posting in the programmable logic device
Storage, either for the RAM that is set in the programmable logic device or to be external in the DDR of the programmable logic device.
As further alternative technical solution, the device of the adjustment liquid crystal module group backlight brightness further includes a RC low pass filtereds
Wave circuit, the RC low-pass filter circuits are used to carry out charge and discharge electric treatment output simulation PWM voltages to the PWM voltage drive signals to drive
Dynamic signal.
As further alternative technical solution, which can also be substituted for one and be external in this and can compile
The digital analog converter of journey logical device, the digital analog converter are used to the free voltage Wave data signal being converted into voltage waveform
Drive signal.
The present invention separately provides a kind of method of adjustment liquid crystal module group backlight brightness, includes the following steps：
S1 Wave data) is read according to control instruction and the Wave data is generated into free voltage Wave data signal；
S2) according to the full scale output voltage value Vr of pwm signal generation module and the free voltage Wave data signal
Waveform voltage output valve Vo generates PWM voltage drive signals, wherein duty ratio σ=Vo/Vr of the PWM voltage drive signals.
As further alternative technical solution, which believes for multistage voltage Wave data
Number, which includes the corresponding waveform voltage output valve Vo of exponent number M and exponent number M, cycle T 1, cycle-index N, redirects
Address addr.
As further alternative technical solution, which believes for ramp voltage waveform data
Number, which includes starting voltage value Vs, end voltage value Ve, cycle T 2；
The ramp voltage waveform data-signal includes upward slope voltage waveform data signal and falling rarnp Wave data signal；
Waveform voltage output valve Vo=Vos+ (Ve-Vs)/T2 of the upward slope voltage waveform data signal；The falling rarnp wave
Waveform voltage output valve Vo=Vos- (Vs-Ve)/T2 of graphic data signal；Wherein, Vos is the waveform electricity of a upper system clock
Press output valve.
As further alternative technical solution, the above method further includes the ripple for inhibiting the PWM voltage drive signals
Step：
S3 the waveform in each period of the PWM voltage drive signals) is split into i=2kSection, obtain i sections of high level H1,
Hi and i sections of low level L1, L2 ... Li of H2 ..., wherein k is positive integer；
S4) by the i sections of high level and i sections of low levels by H1, L1, H2, L2 ..., the sequence crossover of Hi, Li are combined into ripple suppression
System treated PWM voltage drive signals.
The present invention has the following advantages：
Since the present invention directly drives liquid crystal module using free voltage waveform signal, the shape of the free voltage waveform signal
Shape can be with arbitrary disposition, so as to realize the backlight illumination gradual change of liquid crystal module, breathe the display effects such as flicker；In addition, due to
The Wave data for generating free voltage waveform signal can be given by host computer, so as to adjust the back of the body of liquid crystal module in real time
The display effects such as brightness gradual change, breathing flicker.
Description of the drawings
A kind of implementation illustration of the device of adjustment liquid crystal module group backlight brightness of Fig. 1 present invention；
A kind of method flow diagram of adjustment liquid crystal module group backlight brightness of Fig. 2 present invention；
Fig. 3 PWM voltage drive signals oscillograms of the embodiment of the present invention；
The PWM voltage drive signals low and high level distribution maps of 1-3 times of Ripple Suppression of Fig. 4 embodiment of the present invention processing；
Fig. 5 RC low-pass filter circuit schematic diagrams of the embodiment of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
As shown in Figure 1 and Figure 2, a kind of device of adjustment liquid crystal module group backlight brightness of the present invention includes host computer PC, DDR cores
Piece, RC low-pass filter circuits, digital analog converter and the Data Input Interface module, the data that are set in a fpga chip are deposited
Store up control module, module, pwm signal generation module occur for random waveform.It should be noted that in the present embodiment, using FPGA
Chip is a kind of preferred embodiment, and fpga chip can also use the programmable logic device such as APAL, GAL, CPLD to substitute.
In above-described embodiment, host computer PC is for providing Wave data and control instruction, and these Wave datas and control
System instruction can be edited in host computer PC, be configured；It should be noted that the host computer PC in the present embodiment can use ARM, MCU
Equal data processing units substitute.
In above-described embodiment, when system electrification or when reloading, Data Input Interface module by Ethernet, USB,
The Wave data and control instruction that EBI or other interface host computers are sent, and Wave data is stored by data and is controlled
Module is written in DDR chips, and control instruction, which is sent to random waveform, to be occurred in module；It should be noted that the present embodiment
In DDR chips can be substituted for the register or RAM for being set to above-mentioned fpga chip.
In above-described embodiment, these Wave datas include exponent number M, the waveform for generating multistage voltage Wave data signal
Voltage output value Vo, cycle T 1, cycle-index N, jump address addr, or including being used to generate ramp voltage waveform data letter
Number starting voltage value Vs, end voltage value Ve, cycle T 2, wherein free voltage Wave data signal is for realizing liquid crystal module
Breathing flicker display effect, ramp voltage waveform data-signal for realizing the backlight illumination gradual change of liquid crystal module display
Effect.
In above-described embodiment, after module, which occurs, for random waveform receives the control instruction of host computer PC transmission, arbitrary wave
Shape generation module can read the above-mentioned Wave data in DDR chips by data storage control module, and will according to control instruction
These wave data processings are at free voltage Wave data signal.
In above-described embodiment, what it is when host computer PC transmission is the order for generating multistage voltage Wave data signal, works as single order
When waveform starts, module, which occurs, for random waveform to be read from DDR by way of tabling look-up waveform voltage output valve Vo, period
The Wave datas such as T1, cycle-index N, jump address addr, complete the Wave data signal of the primary rank, and judge cycle-index
Whether it is N, adds 1 not equal to cycle count if N if cycle-index, the single order being directed toward into jump address, if cycle-index
Equal to N, then counter O reset enters lower single order.
In above-described embodiment, what it is when host computer PC transmission is the order for generating ramp voltage waveform data-signal, arbitrary wave
Module occurs for shape can read the Wave datas such as starting voltage value Vs, end voltage value Ve, cycle T 2 from DDR, and according to control
Instruction generates upward slope voltage waveform data signal, falling rarnp Wave data signal or multistage ramp voltage waveform data letter
Number, wherein waveform voltage output valve Vo=Vos+ (Ve-Vs)/T2 of upward slope voltage waveform data signal, falling rarnp waveform number
It is believed that number waveform voltage output valve Vo=Vos- (Vs-Ve)/T2, cycle T 2 be system clock Tclk positive integer times, wherein
Vos is the waveform voltage output valve of a upper system clock.
In above-described embodiment, pwm signal generation module is used for the full scale output voltage value according to pwm signal generation module
The waveform voltage output valve Vo of Vr and the free voltage Wave data signal generates PWM voltage drive signals, wherein PWM electricity
Duty ratio σ=Vo/Vr of drive signal is pressed, the sampling period T3 of the PWM voltage drive signals is the just whole of system clock Tclk
The high level time of several times, PWM voltage drive signals each period is t_h=T3 × σ, low level time t_l=T3-t_
h；Sampling period, T3 was longer, then the response of PWM voltage drive signals is slower, output accuracy is higher.
To further illustrate above-described embodiment, such as need one section of ramp voltage waveform and one section of 16 rank sine voltage wave
Shape drives the gradual change of liquid crystal module group backlight brightness and breathing to flicker, the Full-span output electricity of the present embodiment pwm signal generation module
Pressure value Vr is 3.3V, and system clock Tclk is 100MHz, i.e. the sampling period T3 of Tclk=10ns, PWM voltage drive signals are 8
A system clock Tclk, that is, 80ns, starting voltage value Vs=0V, end voltage for generating ramp voltage waveform data-signal
Value Ve=3.3V, cycle T 2=640ns, the PWM voltage drive signals data that pwm signal generation module generates are as shown in table 1；With
In the exponent number M of 16 rank sinusoidal voltage waveform data-signals of generation is 0-15 ranks, waveform voltage output valve Vo is 0~3.3V, every
The cycle T 1=80ns of single order waveform, the i.e. 16 rank sinusoidal voltage waveform data-signal are each every 1280ns circulation primaries
The cycle-index N and jump address addr of rank waveform as listed in table 2, pwm signal generation module generate PWM voltage drive signals
Data are as shown in table 2.Then the ramp voltage waveform and the PWM voltage drive signals data of 16 rank sinusoidal voltage waveforms are 00
02 22 2a aa ab bb bf ff ff bf bb aa, 22 02 00 00 00 02 22 aa bb bf ff, the PWM electricity
It presses shown in the corresponding output voltage wave such as Fig. 3 (b) of drive signal data, Fig. 3 (a) is to realize liquid crystal module group backlight brightness gradually
Become and breathing flickers the driving voltage output waveform needed.
Table 1
Table 2
In above-described embodiment, pwm signal generation module also draws up to the ripple of the PWM voltage drive signals.To subtract
The ripple of small PWM voltage drive signals, pwm signal generation module split the waveform in each period of PWM voltage drive signals
At i=2kSection, obtains i sections of high level and i sections of low levels, wherein k is positive integer, and by the i sections of high level and i sections of low levels
By sequence crossover combination is split, then the ripple of Ripple Suppression treated PWM voltage drive signals reduces k times.For example, working as k
=1, then pwm signal generation module the waveform in each period of PWM voltage drive signals is split into 2 sections, then at Ripple Suppression
The low and high level distribution situation in each period of the PWM voltage drive signals after reason is
In above-described embodiment, as sampling period T3=i × Tclk=2 of PWM voltage drive signalskWhen × Tclk, to PWM
Voltage drive signals carry out k-1 times of Ripple Suppression processing, i.e., the waveform in each period of PWM voltage drive signals are split into 2k -1Section, obtains 2k-1Section high level and 2k-1Section low level, following table list 1-3 times of Ripple Suppression treated PWM voltages driving letter
Number each period low and high level distribution situation, for oscillogram it is as shown in Figure 4.
In above-described embodiment, PWM voltage drive signals can be exported by GPIO step-by-steps, and the output time of 8bit data is 8*
Tclk；It can also be exported by LVDS, 8:The LVDS output times of 1 stringization are 1*Tclk；If you need to generate high-precision PWM voltages
High speed SerDes outputs may be used in drive signal.
In above-described embodiment, RC low-pass filter circuits are used to carry out charge and discharge electric treatment output to the PWM voltage drive signals
PWM voltage drive signals are simulated, which realizes that circuit diagram is as shown in Figure 4 based on RC integrating circuit.
In above-described embodiment, as shown in figure 3, when data are 00 02 22 2a aa ab bb bf ff ff bf bb aa
The PWM voltage drive signals of 22 02 00 00 00 02 22 aa bb bf ff carry out charge and discharge by the RC low-pass filter circuits
Electric treatment exports the driving voltage output waveform as shown in Fig. 3 (a), then simulates shown in PWM voltage drive signals such as Fig. 3 (c).
It should be strongly noted that the pwm signal generation module in above-described embodiment, which can also be substituted for one, is external in this
The digital analog converter of fpga chip, free voltage waveform of the digital analog converter for random waveform directly to that module output occurs
Data-signal is converted into analog voltage waveform driving signal.
As it will be easily appreciated by one skilled in the art that the above is merely preferred embodiments of the present invention, not limiting
The present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should be included in this
Within the protection domain of invention.
Claims (9)
1. a kind of device of adjustment liquid crystal module group backlight brightness, which is characterized in that including being set to a programmable logic device
In a random waveform module and a pwm signal generation module occurs；
The random waveform occurs module and is used to Wave data generating free voltage Wave data signal；
The pwm signal generation module is used for full scale output voltage value Vr and the arbitrary electricity according to the pwm signal generation module
The waveform voltage output valve Vo of corrugating data-signal generates PWM voltage drive signals, wherein the PWM voltage drive signals
Duty ratio σ=Vo/Vr；
The Wave data include exponent number M and waveform voltage output valve Vo corresponding with exponent number M, cycle T 1, cycle-index N,
Jump address addr；Exponent number M and waveform voltage corresponding with exponent number M are defeated according to the free voltage Wave data signal
Go out the multistage voltage Wave data signal that value Vo, cycle T 1, cycle-index N, jump address addr are generated.
2. the device of adjustment liquid crystal module group backlight brightness according to claim 1, which is characterized in that the adjustment liquid crystal module
The device of backlight illumination further includes a data memory module, which is additionally provided with data storage control mould
Block；The data memory module is for storing the Wave data；The data storage control module is for controlling the data memory module
Read-write.
3. the device of adjustment liquid crystal module group backlight brightness according to claim 2, which is characterized in that the programmable logic device
Part is additionally provided with a Data Input Interface module, which is used for from host computer or external data processing unit
It receives the Wave data and the data memory module is written to by the data storage control module, the Data Input Interface module
It is additionally operable to receive control instruction from the host computer or the external data processing unit and read the data according to the control instruction to deposit
The Wave data of storage module generates the free voltage Wave data signal.
4. the device of adjustment liquid crystal module group backlight brightness according to claim 2, which is characterized in that the data memory module
For the register being set in the programmable logic device, or the RAM to be set in the programmable logic device, Huo Zhewei
It is external in the DDR of the programmable logic device.
5. adjusting the device of liquid crystal module group backlight brightness according to claim 1-4 any one of them, which is characterized in that the adjustment
The device of liquid crystal module group backlight brightness further includes a RC low-pass filter circuits, which is used for the PWM voltages
Drive signal carries out charge and discharge electric treatment output simulation PWM voltage drive signals.
6. adjusting the device of liquid crystal module group backlight brightness according to claim 1-4 any one of them, which is characterized in that the PWM
Signal generation module can also be substituted for a digital analog converter for being external in the programmable logic device, which is used for
The free voltage Wave data signal is converted into voltage waveform drive signal.
7. a kind of method of adjustment liquid crystal module group backlight brightness, which is characterized in that include the following steps：
S1 Wave data) is read according to control instruction and the Wave data is generated into free voltage Wave data signal；
The Wave data include exponent number M and waveform voltage output valve Vo corresponding with exponent number M, cycle T 1, cycle-index N,
Jump address addr；Exponent number M and waveform voltage corresponding with exponent number M are defeated according to the free voltage Wave data signal
Go out the multistage voltage Wave data signal that value Vo, cycle T 1, cycle-index N, jump address addr are generated；
S2) according to the waveform of the full scale output voltage value Vr of pwm signal generation module and the free voltage Wave data signal
Voltage output value Vo generates PWM voltage drive signals, wherein duty ratio σ=Vo/Vr of the PWM voltage drive signals.
8. the method for adjustment liquid crystal module group backlight brightness according to claim 7, which is characterized in that the free voltage waveform
Data-signal can also be ramp voltage waveform data-signal, which further includes starting voltage value Vs, end voltage value
Ve, cycle T 2；
The ramp voltage waveform data-signal includes upward slope voltage waveform data signal and falling rarnp Wave data signal；
Waveform voltage output valve Vo=Vos+ (Ve-Vs)/T2 of the upward slope voltage waveform data signal；The falling rarnp waveform number
It is believed that number waveform voltage output valve Vo=Vos- (Vs-Ve)/T2；Wherein, Vos is that the waveform voltage of a upper system clock is defeated
Go out value.
9. the method for adjustment liquid crystal module group backlight brightness according to claim 7, which is characterized in that further include inhibiting to be somebody's turn to do
The step of ripple of PWM voltage drive signals：
S3 the waveform in each period of the PWM voltage drive signals) is split into i=2kSection, obtains i sections of high level H1, H2 ... Hi
With i sections of low level L1, L2 ... Li, wherein k is positive integer；
S4) by the i sections of high level and i sections of low levels by H1, L1, H2, L2 ..., the sequence crossover of Hi, Li are combined at Ripple Suppression
PWM voltage drive signals after reason.
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| CN110853578B (en) * | 2019-11-29 | 2021-09-07 | 京东方科技集团股份有限公司 | Voltage compensation method and device |
| CN112671410A (en) * | 2020-12-29 | 2021-04-16 | 珠海禅光科技有限公司 | Method based on PWM analog DAC function, digital-to-analog conversion circuit and storage medium |
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| CN101938877A (en) * | 2010-09-19 | 2011-01-05 | 无锡力芯微电子股份有限公司 | LED driving circuit |
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| CN104133166A (en) * | 2014-07-07 | 2014-11-05 | 中国电子科技集团公司第四十一研究所 | Large-power arbitrary-waveform generation device and method |
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| CN1885377A (en) * | 2005-06-24 | 2006-12-27 | 夏普株式会社 | Drive circuit |
| CN101551691A (en) * | 2008-03-31 | 2009-10-07 | 上海电气自动化设计研究所有限公司 | PWM arithmetic and device for arbitrary function waveform generation |
| CN101938877A (en) * | 2010-09-19 | 2011-01-05 | 无锡力芯微电子股份有限公司 | LED driving circuit |
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