CN109712468A - A kind of liquid crystal imitation screen based under novel dimming mechanism - Google Patents
A kind of liquid crystal imitation screen based under novel dimming mechanism Download PDFInfo
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- CN109712468A CN109712468A CN201811569369.9A CN201811569369A CN109712468A CN 109712468 A CN109712468 A CN 109712468A CN 201811569369 A CN201811569369 A CN 201811569369A CN 109712468 A CN109712468 A CN 109712468A
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Abstract
The invention discloses a kind of liquid crystal based under novel dimming mechanism to copy screen, including liquid crystal module, the LED lamp panel of liquid crystal module lower end is set, for driving the driving plate of LED light, the optical conditioning system of driving plate lower end is set, and the heat sink of optical conditioning system lower end is set；Wherein, optical conditioning system under different light environments for selecting different modes to realize brightness regulation to LED light；Optical conditioning system includes computer, RS485 interface, C8051330 chip, simulation light-adjusting module and digital light-adjusting module, and the drive module being mounted in driving plate；The time that digital dimming module is opened and is closed by control LED light realizes brightness regulation；Light-adjusting module is simulated by the brightness of the power regulation light in control LED light circuit, RS485 interface is mainly used for communicating, and C8051330 chip is for controlling signal output；Computer is sent a command to as needed on C8051330 chip, so that digital dimming module or simulation light-adjusting module be connected, drive module is for driving the opening of LED light.
Description
Technical field
The present invention relates to a kind of liquid crystal displays, copy particularly with regard to a kind of liquid crystal based under novel dimming mechanism
Screen.
Background technique
The dimming mode of two kinds of LED liquid crystal displays of the prior art is PMW light modulation and DC light modulation respectively, and PWM is dimmed due to following
Ring switchs LED light, and screen flash is obvious under hi-bright mode, the light-modulating mode compared to PMW, and DC light modulation is harmonious under low current mode
It is not good enough, it is easy to produce black surround, circuit fever is serious in the high-power situation of high load.
The prior art combines above two modulation system, high-frequency PWM dimming mechanism is used under low brightness condition, in height
It is dimmed under brightness conditions using DC；By it is low it is bright under the conditions of using pwm signal control LED light gate cycle, to realize tune
Light effectively prevents the above problem；
But high brightness conditions use the easy overload of DC linearity light adjusting mode electric current under high power high load, to be easy
Burn electronic component；And PWM high-frequency pulse signal is easy to produce wave distortion at zero crossing, to influence the essence of light modulation
Degree.How to realize the high-precision light modulation to liquid crystal display and prevents the hair of above-mentioned phenomenon from generating a problem to be solved.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.Mesh of the invention thus
Be in order to eliminate liquid crystal copy screen screen flash problem.
A kind of liquid crystal imitation screen based under novel dimming mechanism, including liquid crystal module, are arranged in liquid crystal module side
LED lamp panel, is used to drive the driving plate of the LED light positioned at LED lamp panel lower end, and the optics tune of driving plate lower end is arranged in
Section system, and the heat sink of the optical conditioning system lower end is set；
Further, optical conditioning system is bright for selecting different modes to realize LED light under different light environments
Degree is adjusted；Optical conditioning system includes computer, the RS485 interface connecting with computer, and be connected with RS485 interface
C8051330 chip, the simulation light-adjusting module being connected with C8051330 chip and digital light-adjusting module, and it is mounted on the drive
The drive module being connect on movable plate and with simulation light-adjusting module and digital light-adjusting module；Digital dimming module passes through control LED light
The time opened and be closed realizes brightness regulation；It simulates light-adjusting module and passes through the bright of the power regulation light for controlling LED light circuit
Degree, RS485 interface are mainly used for realizing communication, C8051330 core by the mutual conversion of the T/RX signal of differential signal and computer
Piece is used to control the signal output of simulation light-adjusting module and digital light-adjusting module；Computer for sending a command to as needed
On C8051330 chip, so that digital dimming module or simulation light-adjusting module be connected, drive module is for driving beating for LED light
It opens.
Further, liquid crystal module includes two pieces without soda-lime glass, and the interlayer between no soda-lime glass, interlayer include
Polarizer, liquid crystal layer and the colored filter set gradually；Wherein polarizer is used to control the luminous flux of the light of LED lamp panel sending
Size, colored filter is used to filter the light of different colours according to color displays, and liquid crystal layer is made of two plates, plate it
Between be equipped with liquid crystal and be used to realize different permutation and combination under the action of electric field in energization to which different images be presented.
Further, digital dimming module includes PWM light-adjusting module, the three-level rectifier being connected with PWM light-adjusting module；
Three-level rectifier is used to inhibit the wave distortion that pwm signal generates at zero crossing, and PWM light-adjusting module is for realizing PWM letter
Number feedback.
Further, analog regulation module is by DC light-adjusting module and the temperature compensation unit group being connected with DC light-adjusting module
At DC light-adjusting module is used for DC Signal Regulation, and temperature compensation unit is used to compensate the internal difference in temperature of DC light-adjusting module.
Further, temperature compensation unit include division module, the filter module that is connected with division module, and with filtering mould
The connected temperature compensation module of block.
Beneficial effects of the present invention:
Instruction is sent to control C8051330 chip output pwm signal or DC signal, to drive drive by computer
The brightness of dynamic model block adjusting LED lamp panel；Inhibit the PWM at zero crossing by installing three-level rectifier additional in digital regulated module
The wave distortion that signal generates；And the feedback mechanism of PWM light-adjusting module is greatly reduced because output low frequency PWM passes through drive module
And the screen flash problem generated, the temperature-compensating that temperature compensation unit carries out circuit is set in analog regulation module, is prevented low
Under temperature or hot conditions, change the quiescent point of circuit.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Attached drawing 1 is whole explosive view of the invention；
Attached drawing 2 is the circuit diagram of optical conditioning system part of the present invention；
Attached drawing 3 is the schematic diagram of computer and RS485 interface of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.
Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction of institute in the embodiment of the present invention (such as up, down, left, right, before and after, inside and outside, in
The heart ...) it is only used for the relative positional relationship explained under a certain particular pose (as shown in the picture) between each component, movement feelings
Condition etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In the present invention unless specifically defined or limited otherwise, term " connection ", " fixation " etc. shall be understood in a broad sense,
For example, " fixation " may be a fixed connection, it may be a detachable connection, or integral；It can be mechanical connection, be also possible to
Electrical connection；It can be directly connected, the connection inside two elements or two can also be can be indirectly connected through an intermediary
The interaction relationship of a element, unless otherwise restricted clearly.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
It in addition, the technical solution between each embodiment of the present invention can be combined with each other, but must be general with this field
Based on logical technical staff can be realized, it will be understood that when the combination of technical solution appearance is conflicting or cannot achieve this
The combination of technical solution is not present, also not the present invention claims protection scope within.
Embodiment 1:
If a kind of liquid crystal based under novel dimming mechanism of FIG. 1 to FIG. 3 copies screen, including liquid crystal module 1, it is arranged in liquid crystal
The driving plate 2 of 1 side of mould group, and the optical conditioning system 3 of 2 lower end of driving plate is set, and is arranged in the optics tune
The heat sink 4 of 3 lower end of section system；Optical conditioning system 3 under different light environments for selecting different modes to LED light reality
Existing brightness regulation；Optical conditioning system 3 include computer 31, the RS485 interface 32 being connect with computer 31, and with RS485 interface
32 connected C8051330 chips 33, the simulation light-adjusting module 34 being connected with C8051330 chip 33 and digital light-adjusting module 35,
And the drive module for being mounted in the driving plate 2 and being connect with simulation light-adjusting module 34 and digital 35 other end of light-adjusting module
21；The time that digital dimming module 35 is opened and is closed by control LED light realizes brightness regulation；It is logical to simulate light-adjusting module 34
The brightness of the power regulation light in control LED light circuit is crossed, RS485 interface 32 is mainly used for the T/ by differential signal and computer 31
Communication is realized in the mutual conversion of RX signal, and C8051330 chip 33 is for controlling simulation light-adjusting module 34 and digital light-adjusting module 35
Signal output；Computer 31 is for sending a command to C8051330 chip 33 as needed, so that digital dimming module be connected
35 or simulation light-adjusting module 34, drive module 21 be used to drive the opening of LED light.
Further, the heat sink 4 is equipped with heat release hole 41.
It is further preferred that the port R0, RE, DE, DO, VCC, PWM, FB, GND is successively arranged on C8051330 chip 33,
Wherein the port DO, DE, RE, RO is all connected on RS485 interface 32, and the TX signal that wherein port DO is used to send in computer 31 turns
Differential signal is turned to, the port RO is used to convert differential signal to the RX signal that computer 31 can identify, DE, RE are by receiving computer
Whether the TX signal that the level height of the R/D signal of sending judges that computer 31 is sent is effective, and specific R/D signal is that " 1 " then has
Effect, R/D signal are " 0 ", then in vain；The port VCC with 5V level for being connected, and the port GND is for being grounded, and PWM port is for defeated
Pwm pulse signal out, FB is for exporting DC signal.
Liquid crystal module 1 includes two pieces without soda-lime glass 11, and the interlayer 12 between no soda-lime glass 11, interlayer 12 include
Polarizer 121, liquid crystal layer 122 and the colored filter 123 set gradually；Wherein polarizer 121 is for controlling the hair of LED lamp panel 2
The size of the luminous flux of light out, colored filter 123 are used to filter the light of different colours, liquid crystal layer 122 according to color displays
It is made of two plates, liquid crystal 124 is equipped between plate for realizing different arrangements under the action of electric field in energization
Combination is to be presented different images.
Preferably, digital dimming module 35 includes PWM light-adjusting module 351, three level being connected with PWM light-adjusting module 351
Rectifier 352；Three-level rectifier 352 is used to inhibit the wave distortion that pwm signal generates at zero crossing, PWM light-adjusting module
351 for realizing pwm signal feedback.
It is further preferred that three-level rectifier 734 uses VIENNA rectifier, three-phase is increased with reference to modulation voltage and is mended
The method for repaying reference voltage, to reduce the wave distortion that pwm signal is generated in zero crossing.
It is further preferred that PMW light-adjusting module 351 includes that resistance R7, resistance R8 and capacitor C8 are formed, wherein resistance
R8, capacitor C8 be connected in parallel on resistance R7 and with the concatenated three-phase rectifier 734 of resistance R7.
Preferably, analog regulation module 34 is by DC light-adjusting module 341 and the temperature-compensating list being connected with DC light-adjusting module 341
Member 342 forms, and DC light-adjusting module 341 is used for DC Signal Regulation, and temperature compensation unit 342 is for compensating DC light-adjusting module 341
Internal difference in temperature.
It is further preferred that DC light-adjusting module 341 is by capacitor C3, resistance R5, variable resistance VR1, diode D2, resistance R6
It is connected in series, wherein further including the capacitor C7 being connected in parallel on variable resistance VR1.
Preferably, the filter module that temperature compensation unit 342 includes division module 3421, is connected with division module 3421
3422, and the temperature compensation module 3423 being connected with filter module 3422.
It is further preferred that division module 3421 is by 5V high level VCC and two groups of concatenated divider resistance R1, R2 group
At；Filter module is formed in parallel by capacitor C1, capacitor C2；Temperature compensation module is connected in series by emitter junction Q1, emitter junction Q2.
It is further preferred that drive module 21 includes diode D2, LED light, the capacitor C6 of setting parallel with one another；Further include
The inductance L being connected with LED light, wherein LED light is at least provided with one group, and wherein inductance L is unstable under PWM light-modulating mode for compensating
Constant current.
The working principle of the invention:
1, computer 31 sends the TX signal of 16 systems by RS485 interface 32 to C8051330 chip 33, works as C8051330
Chip 33 receives TX signal and R/D signal when being " 1 ", after the TX signal for receiving computer 31, C8051330 chip 33
According to TX signal, PWM light-modulating mode or DC light-modulating mode are selected；
2, specifically, when selection be PWM light-modulating mode when, C8051330 chip 33 exists according to the order that computer 31 issues
Instantaneous PWM high-frequency pulse signal is generated at PWM port, after PWM light-adjusting module 351, PWM light-adjusting module 3 believes pwm pulse
Number frequency feedback to C8051330 chip 33 on, to determine whether for PWM high-frequency pulse signal；When C8051330 chip 33
After determination is PWM high-frequency pulse signal, C8051330 chip 33 generates continuous pwm pulse signal, via three-level rectifier
Drive module 21 is flowed through after 352, adjusts brightness by changing conducting and the turn-off time of drive module 21；Specifically, PWM tune
Capacitor C8 on optical module 351 can just be connected in pulse signal in 9KHZ or more.
3, when selection be DC light-modulating mode when, the port FB generate high level, by adjusting on DC light-adjusting module 341 can be changed
The size of the resistance value of resistance VR1 so as to adjust LED brightness；Wherein temperature compensation unit 342 is in parallel with DC light-adjusting module 341,
Division module 3421 in temperature compensation unit 342 is connect with outside 5V power supply, after via resistance R1 partial pressure, the R1 points of electricity walked
It is pressed into and is filtered into filter module 3422, quiescent current is generated by emitter junction Q2 after filtering, quiescent current passes through emitter junction
The bias voltage of itself is adjusted after Q1, and then adjusts the circuit temperature variation because generating after variable resistance VR1 size variation, in turn
Change quiescent point, realizes temperature-compensating.
Claims (5)
1. a kind of liquid crystal based under novel dimming mechanism copies screen, it is characterised in that: including liquid crystal module, be arranged in liquid crystal mould
The LED lamp panel of group lower end is used to drive the driving plate of the LED light, and is arranged in the drive positioned at the LED lamp panel lower end
The optical conditioning system of movable plate lower end, and the heat sink of the optical conditioning system lower end is set；
Wherein, the optical conditioning system under different light environments for selecting different modes to realize brightness tune to LED light
Section；The optical conditioning system includes computer, the RS485 interface connecting with the computer, and is connected with the RS485 interface
C8051330 chip, the simulation light-adjusting module being connected with the C8051330 chip and digital light-adjusting module, and be mounted on
The drive module being connect in the driving plate and with the simulation light-adjusting module and the digital dimming module；The digital dimming
The time that module is opened and is closed by control LED light realizes brightness regulation；It simulates light-adjusting module and passes through control LED light circuit
Power regulation light brightness, the RS485 interface be mainly used for by the T/RX signal of differential signal and computer mutually turn
Realization communication is changed, the C8051330 chip is used to control the signal output of simulation light-adjusting module and digital light-adjusting module；It is described
Computer is sent a command to as needed on C8051330 chip, so that digital dimming module or simulation light-adjusting module, institute be connected
Drive module is stated for driving the opening of the LED light.
2. a kind of liquid crystal based under novel dimming mechanism according to claim 1 copies screen, it is characterised in that: the liquid
Brilliant mould group includes two pieces without soda-lime glass, and the interlayer between no soda-lime glass, the interlayer include the polarisation set gradually
Plate, liquid crystal layer and colored filter；Wherein polarizer is used to control the size of the luminous flux of the light of LED lamp panel sending, colour filter
Mating plate is used to filter the light of different colours according to color displays, and the liquid crystal layer is made of two plates, sets between the plate
There is liquid crystal for realizing different permutation and combination under the action of the electric field in energization to which different images be presented.
3. a kind of liquid crystal based under novel dimming mechanism according to claim 1 copies screen, it is characterised in that: the number
Word light-adjusting module includes PWM light-adjusting module, the three-level rectifier being connected with the PWM light-adjusting module；Three level rectifying
Device is used to inhibit the wave distortion that pwm signal generates at zero crossing, and the PWM light-adjusting module is for realizing pwm signal feedback.
4. a kind of liquid crystal based under novel dimming mechanism according to claim 1 copies screen, it is characterised in that: the mould
Quasi- adjustment module is made of DC light-adjusting module and the temperature compensation unit being connected with the DC light-adjusting module, and DC light-adjusting module is used for
DC Signal Regulation, temperature compensation unit are used to compensate the internal difference in temperature of DC light-adjusting module.
5. a kind of liquid crystal based under novel dimming mechanism according to claim 4 copies screen, it is characterised in that: the temperature
Spend the filter module that compensating unit includes division module, is connected with the division module, and the temperature being connected with the filter module
Spend compensating module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811569369.9A CN109712468A (en) | 2018-12-21 | 2018-12-21 | A kind of liquid crystal imitation screen based under novel dimming mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811569369.9A CN109712468A (en) | 2018-12-21 | 2018-12-21 | A kind of liquid crystal imitation screen based under novel dimming mechanism |
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| CN109712468A true CN109712468A (en) | 2019-05-03 |
Family
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| CN201811569369.9A Pending CN109712468A (en) | 2018-12-21 | 2018-12-21 | A kind of liquid crystal imitation screen based under novel dimming mechanism |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220183121A1 (en) * | 2020-12-04 | 2022-06-09 | Savant Technologies Llc | Driving Circuit for LED Lamp, LED Lamp Containing Same and Method for Operating Driving Circuit |
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