CN103971646A - Automatic low-ash complete-period compensating circuit, system and method of high-definition LED (Light Emitting Diode) display screen - Google Patents
Automatic low-ash complete-period compensating circuit, system and method of high-definition LED (Light Emitting Diode) display screen Download PDFInfo
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- CN103971646A CN103971646A CN201410228559.XA CN201410228559A CN103971646A CN 103971646 A CN103971646 A CN 103971646A CN 201410228559 A CN201410228559 A CN 201410228559A CN 103971646 A CN103971646 A CN 103971646A
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses an automatic low-ash complete-period compensating circuit, system and method of a high-definition LED (Light Emitting Diode) display screen. The automatic low-ash complete-period compensating circuit comprises a current source used for generating a current signal of an LED lamp, a detection module used for detecting a forward voltage when a low current is connected to the LED lamp and further configured to keep the forward detection voltage, a measurement module used for measuring time when an anode voltage of the LED lamp rises to a corresponding forward detection voltage when a display current is connected to the LED lamp. The automatic low-ash complete-period compensating system comprises an initializing unit and an operating unit, wherein the initializing unit comprises a detection module and a measurement module; the operating unit comprises a signal generator, a compensating module and a current driver. The drive method disclosed by the invention is capable of ensuring that the high-definition LED display screen can be equivalently and completely charged when being in a minimum gray level.
Description
Technical field
The present invention relates to the technical field of circuit compensation, particularly the low ash of a kind of high definition LED display complete period auto compensatng circuit, system and method, to guarantee the input at the equal electric charge of minimum gray, reach the low grey consistance of display screen.
Background technology
Recently, light emitting diode (LEDs) is widely used in electronic equipment and application.Such as, LEDs is used to the light source of general illumination.In addition, LEDs is also used to manufacture display screen, televisor etc.Except these application, going back demand motive circuit provides power supply and controls LEDs and send the illumination light of expection brightness to LEDs.
LED display board relates generally to the device being made up of the array of LEDs mono-or many row and column.Select as one, a LED display board can comprise multiple submodules, and each submodule has one or more such LED array.LED board can, with monochromatic LEDs array, can be also polychrome.In the time that homochromy LED lamp is used in the display application of center, each LED is normally corresponding with display unit or pixel.In the time that LED board uses and disuses the LED lamp of look, display unit or pixel generally comprise 3 lamps, may be red-light LED, green light LED and blue-ray LED.The LED lamp of three clusters like this is known as RGB unit.Generally there are 4 end pin paster RGB unit.The first, two, three ends can be distinguished corresponding red, green and blue LED lamp, the common anode utmost point or the common cathode of the corresponding LED lamp of the 4th end.
A LED drive circuit transmission power supply is transferred to the electric current of LED lamp array to LED lamp array and control.Driving circuit may be driving or the multichannel driving of single passage.Each channels drive circuit can transmit power supply to multiple LED lamps and control the electric current that is sent to LED lamp.One group of LED lamp electric power be connected to identical passage, this group LED lamp so-called " sweep trace ".
Usually, the electric current that LED drive circuit is transmitted and flow through LED lamp by variation is controlled the brightness of LED.According to transmitting electric current, LED brightness also can respond according to the characteristic specifications of LED.Larger electric current is sent to LED and conventionally shows more high-intensity brightness.For effectively controlling the transmission of electric current, LED drive circuit can be with a constant current source combining with modulation, such as width modulation (PWM).
Figure 1A has illustrated a desirable pulse-width signal 110, and the width of each pulse width modulation cycle is W, and amplitude is A.The width W of pulse 110 that changes PWM, LED drive circuit can transmit suitable drive current effectively to LED lamp, to show the light of different shading values of GTG.In the time transmitting pwm signal, the different load characteristic of the visible each LED of driving circuit.The diversity of this load characteristic may form the effect of a large amount of accumulations, the variation of the forward voltage Vf of for example each LED, and the variation of the intrinsic internal resistance of each sweep trace, and each LED responds the variation of forward current If.These effects cause the difference in brightness between huge LED lamp, particularly in the time that low gray scale is set.Figure 1B be one typically due to variability, the pwm signal 120 in driving circuit.
Further, in the time that low gray scale arranges, the width W of pwm signal may be very narrow, and the pwm signal of that pulse may be because of uncompensated drive current and load characteristic and lost.Therefore, system designer will adopt the method for pre-correspondence to overcome the distortion of the upper pwm signal of PCB.
Fig. 1 C represents a desirable pwm signal 130, it each PWM cycle start have a pre-adjustment part 135.Usually, pre-adjustment part 135 has individual pulse duration or width D, and it is generally less than the pulsewidth W in conventional PWM cycle, and has an amplitude A that is greater than the amplitude A in conventional PWM cycle '.In LED display panel drive circuit, PWM current signal can be corrected by pre-adjustment, to overcome or to compensate the distorted signals of rise time.Fig. 1 D represents a typical pwm signal 140 in driving circuit, with pre-adjustment.
In the time that low gray scale arranges, the pulse duration D of pre-adjustment part 135 can be similar to or be greater than the pulsewidth W in PWM cycle.Thus, even if there is pre-adjustment, PWM drives still distortion of signal, causes short pulse and/or is attended by PWM transition.Therefore, PWM drives signal may require further to process, particularly in the time that low gray scale arranges.
Summary of the invention
Fundamental purpose of the present invention is that the shortcoming that overcomes prior art, with not enough, provides the low ash of a kind of high definition LED display complete period auto compensatng circuit.
Another object of the present invention is to, the low ash of a kind of high definition LED display complete period self compensating system is provided.
A further object of the present invention is, the low ash of a kind of high definition LED display complete period automatic compensating method is provided.
In order to reach above-mentioned the first object, the present invention by the following technical solutions:
The low ash of high definition LED display complete period auto compensatng circuit, comprising:
A current source, for generation of the current signal of LED lamp;
A detection module, connects forward voltage corresponding when low current for detection of LED lamp, and is further set to keep this forward to detect voltage;
A measurement module, while rising to LED lamp connection demonstration electric current for measuring LED lamp anode voltage, corresponding forward detects the time of voltage.
Preferably, auto compensatng circuit of the present invention also comprises a comparer; A three-terminal switch, is connected to the output of comparer, and this three-terminal switch can switch between the first situation and the second situation; Wherein the first situation is conductivity between comparer and detection module, and the second situation is conductivity between comparer and measurement module.
Preferably, described measurement module comprises a counter, and in the time that anode voltage does not detect voltage higher than forward, to clock period counting, clock periodicity is corresponding to Measuring Time; A storage unit, for retaining Measuring Time.
Preferably, described detection module comprises a voltage multiplex adapter, for transmission voltage increment signal to comparer.
In order to reach above-mentioned the second object, the present invention by the following technical solutions:
The low ash of high definition LED display complete period self compensating system, this system comprises:
An initialization unit; An operating unit;
Initialization unit wherein comprises:
A detection module, connects forward voltage corresponding when low current for detection of LED lamp, and is further set to keep this forward to detect voltage;
A measurement module, while rising to LED lamp connection demonstration electric current for measuring LED lamp anode voltage, corresponding forward detects the time of voltage;
Operating unit wherein comprises:
A signal generator, for generation of driving signal;
A compensating module, for revising driving signal according to Measuring Time;
A current driver, drives signal for receiving to revise, and the corresponding driving signal of revising, and transmits a drive current to LED lamp, to light with the brightness of expecting.
Preferably, compensating module is configured to postpone PWM voltage signal according to Measuring Time.
Preferably, driving signal is a pulse-length modulation voltage signal.
In order to reach an above-mentioned object again, the present invention by the following technical solutions:
The method of auto compensatng circuit of low gray scale complete period of high definition LED display, comprises the steps:
Most LED lamp points of initialization LED display panel, drive signal to LED lamp to light LED display panel according to the brightness of expecting by providing, and have wherein determined the compensating parameter of LED lamp when initialization LED lamp.Operation to LED display panel comprises: produce predetermined driving signal, thereby use the predetermined driving signal of compensating parameter amendment LED lamp to obtain an amended LED lamp driving signal; Amended driving signal is provided then to LED lamp.
Preferably, determine that compensating parameter comprises the forward voltage rise time of determining a LED lamp that is selected from LED display panel or the forward voltage of determining selected LED lamp;
Determining that forward voltage comprises provides a weak current test voltage to selected LED lamp, until voltage stabilization, this burning voltage is forward voltage.
Preferably, determining that the rise time comprises provides one to show electric current the time of measuring LED lamp terminal voltage and rise to forward voltage to selected LED lamp, and this time is the rise time;
Revise the default signal that drives and comprise the rise time that drives signal delay forward voltage to default;
Default driving signal is a pulse width modulating signal, and the default signal that drives of delay comprises the periodic width of expanding pulse width modulating signal.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, the present invention be industry member first the hardware of the low grey consistency problem to display screen automatically process.
2, the auto compensatng circuit of this law can detect the cut-in voltage of LED diode automatically.
3, auto compensatng circuit of the present invention detects LED diode automatically from being energized to the luminous rise time
4, the present invention can be according to the different cut-in voltages and the rise time that detect, carries out the displaying time compensation of PWM.
5, the present invention, at whole display screen in the situation that not having gray scale to correct, has superior low grey consistance.
Brief description of the drawings
Figure 1A has represented a desirable pulse width modulating signal.
Figure 1B has represented a typical not pulse width modulating signal with pre-adjustment in driving circuit.
Fig. 1 C has represented a desirable pulse width modulating signal that starts to have pre-adjustment part in each cycle.
Fig. 1 D has represented a typically pulse width modulating signal with pre-adjustment in driving circuit.
Fig. 2 is circuit theory diagrams consistent with an example of the present invention.
Fig. 3 is the sequential schematic diagram consistent with an example of the present invention.
Fig. 4 is circuit theory diagrams consistent with another example of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
The reference that will describe now Multi-instance of the present invention in detail, accompanying drawing will be set forth example of the present invention.It should be noted that, the any feasible similar or identical many references that use in picture only mean similar or identical function, the example of the present invention that picture is described is just to the object of explanation, those of ordinary skill in the art easily recognize the different instances of method and structure described herein from the following description, but these examples do not depart from the principle of invention described herein.
The invention relates to and control LED display pixel and guarantee that compensating for full period shows an a kind of device, an integrated circuit and method of (FCCL).In addition, here having invented a kind of device, a kind of integrated circuit and a kind of method is the variation relevant for system balance, this associated change causes the luminance difference between LED lamp in LED array, and compensation is later to guarantee being conveyed into consistent electric charge under minimal gray settings.The system with correlation effect may have cumulative bad and cause for example, varying widely at different LED passage and/or different chip chamber minimum pulse (, pwm signal is in the time that low gray scale arranges).Therefore, preferably first know direct resistance and the response characteristic of each LED on sweep trace, to such an extent as to be that the related system with this effect compensates.No matter this has ensured that the electric charge of wanting is transferred to corresponding LED, and the specification of the forward conduction voltage Vf of LED, or relative position and/or in the impact of the corresponding impedance of a string middle LED of a LED array.
Usually, the method for driving LED display screen may comprise an initial step and an operation steps.This initial step may comprise to LED display and powers on and test the LED of LED display; But this operation steps may comprise select a sweep trace from multiple sweep traces of a LED array, then power on to the LED on each selected sweep trace, repeat to select step and power on step until the LED on all sweep traces be lit reality a picture, this operation steps may repeat always into show static images.
In an example, LED driving method of the present invention may comprise a method that the variation of system is compensated, and this method combines initial step and or the operation steps of LED driving method.The compensation method of invention has at present comprised a preparation process and a modify steps.The preparation process of this compensation method has comprised a detecting step and a testing procedure.Preparation process should be carried out after LED display powers at once.Different, the preparation process of compensation method also may be carried out according to design reference in the operation steps of LED driving method.Further, the modify steps of compensation method combines the operation steps of LED driving method.In an example, modify steps may comprise in the time powering on to LED, expands the width of uncompensated PWM current signal.
Fig. 2 principle has been set forth a FCCL circuit 200, and it is consistent with an example of invention at present, for realizing the method for the relevant variation of bucking-out system.As shown in Figure 2, FCCL circuit 200 comprises passage output 230, one detection modules 240 of 220, one three-terminal switches of 210, one comparers and a test circuit 250.
Passage output 210 control signals may accepting from a control port 202, respond this control signal, are that a LED array 260 transmits a demonstration electric current.LED array 260 comprises numerous LED264 that arrange with row and column.In an example, numerous LED264 may be from passage electrical couplings to common anode 262.It must be understood that, in another one example, LED264 may be coupled to common negative electrode.Common anode 262 possibility electrical couplings are to the electrode input end (+) of comparer 220.Comparer 220 can compare the voltage of electrode input end and reverse input end, and Output rusults is delivered to first port of three-terminal switch 230.
In another embodiment, LED array 260 comprises numerous passages and each passage has independently driving circuit to drive.But for illustrative purposes, Fig. 2 expresses a unique passage of LED264.In an example, the negative electrode of each LED264 is electrically connected to one end of two-terminal switch 266, and the other end of two-terminal switch 266 is connected to ground 268.Switch 266 is for selecting the corresponding LED264 that will light.
In an example, detection module 240 is made up of selector switch 242 and phase inverter 244 (rejection gate 244).The input end of selector switch 242 accepts also to output to from the signal of an accurate voltage divider 246 reverse input end (-) of comparer 220.The input end of phase inverter 244 is accepted second port of three-terminal switch 230 and output is delivered to selector switch 242 to keep voltage.
Measurement module 250 comprises reverser 252, with door 254, and counter 256 and storage unit 258.The input of phase inverter 252 receives the output signal of detection port 204 and carries the first input end oppositely outputing to door 254.Output signal with a second input end receiving port 202 of door 254.With door 254 based on logical process at the input signal of the first and second ports and carry result to arrive an Enable Pin of counter 256.In this example, counter 256 is 6 digit counters.
Once counter 256 is enabled, it by according to the number in corresponding clock signal clk counting clock cycle until counter 256 be stopped.The clock periodicity producing is transported in storer 258 to use in the future.In this example, storer 258 is static RAM (SRAM).The Enable Pin of storer 258 is electrically connected to the 3rd port of three-terminal switch 230.
Three-terminal switch 230 switches between first state and second state.In this example, the first state of switch 230 is the first port and second port of electrical communication switch 230, the first port of electric blocking swtich 230 and the 3rd port.That is to say, under the first state, the path of conducting is from comparer 220 to detection module 240.In the same manner, in this example, the second state of switch 230 is the first port and the 3rd ports of electrical communication switch 230, the first port of electric blocking swtich 230 and the second port.That is to say, under the second state, the path of conducting is from comparer 220 to measurement module 250.Switch 230 is controlled from the detection signal of port 204.
Fig. 3 has described the sequential chart of the compensation method relevant to an example of the present invention.Just as discussed above, compensation method has comprised a preparation process and a modify steps.Preparation process further comprised detecting step as shown in the A part of Fig. 3 and measuring process as shown in the B part of Fig. 3.In an example, preparation process can be realized with the circuit that Fig. 2 describes.
To discuss in detail below according to the method for the driving LED display screen of an example of the present invention, reference is as Fig. 2 and 3.In A part, the forward conduction voltage Vf that detects a specific LED is described.In B part, the accurate measurement that reaches the time cycle of forward conduction voltage Vf is not described.
The detection of A part-forward conduction voltage Vf.
In detecting step, three-terminal switch 230 is switched to the first state.A LED of LED array 260 is first selected.Passage output 210 then carries a little electric current to the LED choosing.Sequential chart 310 in Fig. 3 has been described the anode voltage of selected LED.As in Fig. 3 shown in A part, anode voltage (or voltage of the positive input (+) of comparer 220) slowly increases and is stabilized in forward conduction voltage Vf.In example, low current is approximately 2.0mA or still less, and forward conduction voltage Vf is approximately 2.2v.
In this example, voltage selector 242 is used for accurately measuring the forward conduction voltage Vf of selected LED.Voltage selector 242 can enter programming by the small step of high precision value and accurately measure the change in voltage in different LED.That is to say, voltage selector 242 is used for entering to increase with small step the voltage of the reverse input end (-) of comparer 220.In the present example, voltage selector 242 comprises a voltage divider, and it increases voltage with the stepping of 0.1v.
When reverse input end (-) voltage of comparer 220 equals or during a little more than the forward voltage Vf of positive input (+), detection module 240 maintains this voltage.Sequential chart 320 in Fig. 3 has illustrated this maintenance voltage from detection module 240.The voltage once be maintained, three-terminal switch 230 is diverted the second situation.
B part---the measurement of Tr time.
In B part, with respect to the maintenance voltage obtaining in A part, forward voltage Vf is measured again.Specifically, measure the time quantum (Tr time) when paying close attention to anode voltage and reaching forward voltage Vf.At first, show that electric current is for selected LED lamp.In an instantiation, demonstration electric current one is connected, and counter 256 is just enabled and starts timing clock periodicity at once.Fig. 3 for example understands the high-resolution clock signal 340 that can be used to Tr time measurement.
Corresponding to showing electric current, anode voltage 310 (or positive input (+) voltage of comparer 220) is increased to forward voltage Vf and remains on forward voltage Vf from 0.Because reverse input end (-) voltage at comparer 220 remains on maintenance voltage, once anode voltage 310 meets or exceeds this maintenance voltage, comparer output 330 (being the first end of switch 230) uprise from low.As a result, in the time that comparer 220 output changes, the storage unit 258 store clock periodicity that is enabled.The Tr time of clock periodicity when reaching forward voltage Vf.When compensation of phase changes PWM driving signal, the Tr time is used as a compensating parameter.It should be noted that detecting step (A part) and measuring process (B part) can be repeated until that the compensating parameter 260 of the whole LED lamps of LED array is obtained.
Fig. 4 for example understands a schematic circuit according to example of the present invention.In instantiation, use the circuit in Fig. 4 for example, modify steps can be performed.As shown in Figure 4, LED drive circuit 400 comprises 440, one current drivers 460 of 430, one ON/OFF control modules of 420, one adder units of 410, one PWM generating units of an initialization unit and a constant-current controller 450.
Initialization unit 410 detects the forward voltage Vf of LED lamp, and measures the Tr time while driving signal to arrive forward voltage Vf.The Tr time of being measured by initialization unit 410 is used as normal PWM of compensating parameter amendment and drives signal.In example, as shown in Figure 2, initialization unit 410 comprises FCCL circuit 200.In example, the Tr time can measure by execution A part and the B step partly described before.
PWM generating unit 420 produces a default pwm signal, can be used to drive a LED array 470.Adder unit 430 can be revised default pwm signal by the definite compensating parameter of initial cell 410.In an example, adder unit 430 use compensating parameters postpone default pwm signal.After the pwm signal of this delay, be admitted to ON/OFF control module 440.
ON/OFF control module 440 produces a control signal based on the pwm signal postponing, and sends this signal to current driver 460.Constant current source controller 450 is controlled current driver 460 and is produced steady current.After steady current, adjusted from the control signal of ON/OFF control module 440, thereby produced a PWM current signal to LED array 470.
The PWM of compensation drives signal during the normal running of LED display panel, to carry out.Rise time Tr value that it should be noted that each LED6 position can be added on the word of PWM dynamically, as a part for color and brightness calibration compensation.In the time applying pwm pulse to LED, the measured Tr time can be used as offset, by adding that this value drives the end of signal to do time delay to PWM.Because the rise time Tr of forward voltage Vf can catch the impact being accumulated on LED display panel effectively, the method of driving circuit and this patent can be guaranteed can guarantee the input at the equal electric charge of minimum gray in the time of minimum gray scale, reaches the low grey consistance of display screen.
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (10)
1. the low ash of high definition LED display complete period auto compensatng circuit, is characterized in that, comprising:
A current source, for generation of the current signal of LED lamp;
A detection module, connects forward voltage corresponding when low current for detection of LED lamp, and is further set to keep this forward to detect voltage;
A measurement module, while rising to LED lamp connection demonstration electric current for measuring LED lamp anode voltage, corresponding forward detects the time of voltage.
2. the low ash of high definition LED display according to claim 1 complete period auto compensatng circuit, is characterized in that, also comprises a comparer; A three-terminal switch, is connected to the output of comparer, and this three-terminal switch can switch between the first situation and the second situation; Wherein the first situation is conductivity between comparer and detection module, and the second situation is conductivity between comparer and measurement module.
3. the low ash of high definition LED display according to claim 2 complete period auto compensatng circuit, it is characterized in that, described measurement module comprises a counter, in the time that anode voltage does not detect voltage higher than forward, to clock period counting, clock periodicity is corresponding to Measuring Time; A storage unit, for retaining Measuring Time.
4. the low ash of high definition LED display according to claim 1 complete period auto compensatng circuit, is characterized in that, described detection module comprises a voltage multiplex adapter, for transmission voltage increment signal to comparer.
5. the low ash of high definition LED display complete period self compensating system, is characterized in that, this system comprises:
An initialization unit; An operating unit;
Initialization unit wherein comprises:
A detection module, connects forward voltage corresponding when low current for detection of LED lamp, and is further set to keep this forward to detect voltage;
A measurement module, while rising to LED lamp connection demonstration electric current for measuring LED lamp anode voltage, corresponding forward detects the time of voltage;
Operating unit wherein comprises:
A signal generator, for generation of driving signal;
A compensating module, for revising driving signal according to Measuring Time;
A current driver, drives signal for receiving to revise, and the corresponding driving signal of revising, and transmits a drive current to LED lamp, to light with the brightness of expecting.
6. the low ash of high definition LED display according to claim 5 complete period self compensating system, is characterized in that, driving signal is a pulse-length modulation voltage signal.
7. the low ash of high definition LED display according to claim 5 complete period self compensating system, is characterized in that, compensating module is configured to postpone PWM voltage signal according to Measuring Time.
8. the method for auto compensatng circuit of low gray scale complete period of high definition LED display according to claim 1, is characterized in that, comprises the steps:
Most LED lamp points of initialization LED display panel, drive signal to LED lamp to light LED display panel according to the brightness of expecting by providing, and have wherein determined the compensating parameter of LED lamp when initialization LED lamp; Operation to LED display panel comprises: produce predetermined driving signal, thereby use the predetermined driving signal of compensating parameter amendment LED lamp to obtain an amended LED lamp driving signal; Amended driving signal is provided then to LED lamp.
9. the method for auto compensatng circuit of low gray scale complete period of high definition LED display according to claim 8, it is characterized in that, determine that compensating parameter comprises the forward voltage rise time of determining a LED lamp that is selected from LED display panel or the forward voltage of determining selected LED lamp;
Determining that forward voltage comprises provides a weak current test voltage to selected LED lamp, until voltage stabilization, this burning voltage is forward voltage.
10. the method for auto compensatng circuit of low gray scale complete period of high definition LED display according to claim 8, it is characterized in that, determining that the rise time comprises provides one to show electric current the time of measuring LED lamp terminal voltage and rise to forward voltage to selected LED lamp, and this time is the rise time;
Revise the default signal that drives and comprise the rise time that drives signal delay forward voltage to default;
Default driving signal is a pulse width modulating signal, and the default signal that drives of delay comprises the periodic width of expanding pulse width modulating signal.
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| CN111083854A (en) * | 2020-01-10 | 2020-04-28 | 中科芯集成电路有限公司 | LED display screen compensation circuit and method thereof |
| CN111083854B (en) * | 2020-01-10 | 2021-07-27 | 中科芯集成电路有限公司 | LED display screen compensation circuit and method thereof |
| CN114170955A (en) * | 2021-11-30 | 2022-03-11 | 中科芯集成电路有限公司 | LED screen low-gray driving circuit and LED display driver |
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Application publication date: 20140806 |