CN116312402B - Mini LED backlight driving method - Google Patents
Mini LED backlight driving method Download PDFInfo
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- CN116312402B CN116312402B CN202310551880.0A CN202310551880A CN116312402B CN 116312402 B CN116312402 B CN 116312402B CN 202310551880 A CN202310551880 A CN 202310551880A CN 116312402 B CN116312402 B CN 116312402B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000000694 effects Effects 0.000 abstract description 5
- 230000020169 heat generation Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- 239000011324 bead Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a mini LED backlight driving method, which comprises the steps of carrying out multiplication operation on m-bit gray data D and n-bit global current value Io, and temporarily storing m+n-bit product results; dividing the product result with a preset n-bit channel current value In, sending the quotient as output gray data to a gray data module for temporary storage, and outputting an n-bit remainder to a selector and a PWM signal generator; and then a PWM signal generator is combined with a clock period signal output by the oscillator to generate a PWM signal, and meanwhile, whether a tail pulse signal is added or not is judged according to the n-bit remainder so as to control a constant current switch to realize PWM gray control of an LED constant current peak value. The invention can effectively reduce the power consumption of the current output port of the chip and improve the problem of large heat generation of the LED driving system. The loss of the driving chip is reduced and the power utilization rate is improved under the conditions that the LED display effect is not affected and the cost is not increased.
Description
Technical Field
The invention relates to the technical field of LED driving, in particular to a mini LED backlight driving method.
Background
LED (light emitting diode) displays are gradually evolving from mini LEDs (sub-millimeter light emitting diodes) to macro LEDs (micro light emitting diodes), but there are still cost and technical problems. At present, the mini LED driving display technology tends to be mature, but the dot spacing is still too large, and the requirement of watching at a short distance like a television can not be met. However, OLED (organic light emitting diode) is difficult to spread to a large screen due to its high cost. Therefore, the mini LED is used for matrix type backlight and combined with liquid crystal display, so that the liquid crystal display screen has the advantages of high contrast ratio and wide color gamut, the display effect close to the OLED is realized, and the cost is greatly reduced compared with that of the OLED. Meanwhile, the standby power consumption of the liquid crystal display is greatly reduced by adding the mini LED matrix type backlight technology. Therefore, the liquid crystal television gradually starts to spread matrix mini LED backlight.
Currently, mini LED backlight driving technologies are classified into AM (active matrix type) and PM (passive matrix type). The AM driving technology is characterized in that the AM driving technology is non-scanning, and the driving chip directly adjusts the current to drive the LED lamp beads. The PM driving technology is characterized by scanning driving, and generally adopts a scheme that an LED lamp and a driving chip are separated. Meanwhile, in order to simplify driving and reduce cost, a common driving chip integrates more current output ends. The current output ends need to be connected to the cathodes of the LED lamp strings respectively, as shown in fig. 1, the situation of different line resistances can occur due to different distances from the current output ends of the chips to the LED lamp beads. In fig. 1, R2, …, ra, …, rn-1, and Rn are equivalent wiring impedances, and it can be known that the LED string a is closest to the LED driving chip, the equivalent wiring impedance Ra is minimum, and the LED string 1 is farthest from the LED driving chip, so that the equivalent wiring impedance R1 is maximum. Because the LED lamp strings are uniformly distributed on the back of the liquid crystal display screen and are relatively dispersed, one LED driving chip can drive a plurality of LED lamp strings, and therefore the problem of wiring impedance difference is inevitably generated. It can be known that the equivalent wiring impedance is related to the actual wiring, not a fixed value, and the optimization can be adjusted according to the actual situation. In the prior art, fixed uniform LED driving current is adopted, namely, the current of each LED lamp string is the same when the LED lamp string works, so that different wiring impedances can generate different voltage drops, the total voltage drop of the lamp string with large wiring impedance is large, the total voltage drop of the lamp string with small wiring impedance is small, and therefore, the voltage spread of a current output port of a driving chip is different, but the system must ensure that the worst lamp string with the largest voltage drop can normally work, namely, the lamp string with the largest voltage drop can normally drive under constant current, so that the residual voltage of the lamp string with small voltage drop falls on the driving chip, excessive power consumption is generated, and larger heating is caused. Since R1> R2> Ra is known from the wiring length, when the LED is turned on, the voltages of the current output ports of the driving chip are respectively as shown in FIG. 2, the voltage of the current output port o1 is the lowest, o2 times, and oa is the highest. The current output port voltage of the driving chip is larger than a set value to ensure constant current driving, so that the LED lamp string with the largest wiring impedance can work normally, the LED power supply voltage needs to be increased, and the voltage of the lamp string o1 with the largest voltage drop is higher than the set value. At this time, the total voltage drop of the LED lamp string a with small wiring impedance is minimum, the residual voltage can fall on the corresponding current output port oa, the power consumption of the current output port oa is increased due to the higher residual voltage, the chip is enabled to generate larger power due to the plurality of lamp strings with small wiring impedance, and the chip is heated seriously. Therefore, the existing PM driving technology has the defect of large heat generation of a driving chip.
Disclosure of Invention
The invention aims to provide a mini LED backlight driving method, which mainly solves the problem that a driving chip commonly existing in the prior PM driving technology generates large heat.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a mini LED backlight driving method comprises the following steps:
s1, when the chip works, m-bit gray data D is extracted from storage, multiplication operation is firstly carried out on the m-bit gray data D and a preset n-bit global current value Io, and m+n-bit product results are temporarily stored;
s2, dividing the product result with a preset n-bit channel current value In, sending the quotient as output gray data to a gray data module for temporary storage, and outputting an n-bit remainder to a selector and a PWM signal generator;
s3, the gray data temporarily stored in the gray data module is input into a PWM signal generator, the PWM signal generator generates PWM signals by combining clock period signals output by an oscillator, meanwhile, whether n-bit remainder is 0 or not is judged, if yes, no tail pulse signals are output, and if not, 1 tail pulse signal with unit pulse width is added into the PWM signals;
s4, inputting a tail pulse signal into the selector, selecting n-bit remainder to output a corresponding current when the tail pulse signal is effective, otherwise outputting an n-bit channel current value during the PWM signal;
s5, the constant current switch is turned on to realize PWM gray scale control of the LED constant current peak value.
Further, in the step S4, the n-bit channel current value and the current value outputted by the n-bit remainder are respectively connected to the n-way switches of S1-Sn, and the corresponding reference current is selected by the selector.
Further, the n-bit global current value Io and the n-bit channel current value In are set before the chip normally works; each current output channel has a corresponding n-bit channel current value In, and can be set independently.
Compared with the prior art, the invention has the following beneficial effects:
according to the LED backlight driving method, the multiplier and the divider are used for processing gray data, the current value of part of current output ports is increased according to the specified rule, the voltage of the corresponding output port is reduced, the gray data value is correspondingly reduced, the pulse width of PWM is reduced, so that the power consumption of the current output ports of a chip can be effectively reduced, and the problem of large heat generation of an LED driving system is solved. The loss of the driving chip is reduced and the power utilization rate is improved under the conditions that the LED display effect is not affected and the cost is not increased.
Drawings
Fig. 1 is a schematic diagram of a mini LED driving circuit in the prior art.
Fig. 2 is a voltage diagram of a mini LED driving port in a mini LED driving circuit in the prior art.
Fig. 3 is a flow chart of the method of the present invention.
Fig. 4 is a block diagram of a circuit for implementing the method of the present invention.
FIG. 5 is a diagram of PWM control signals and tail pulse signals when the remainder is not 0 in the embodiment of the invention.
Fig. 6 is a diagram of PWM control signals when the remainder is 0 in the embodiment of the present invention.
FIG. 7 is a graph showing the comparison of the output effects in the embodiment of the present invention.
Detailed Description
The invention will be further illustrated by the following description and examples, which include but are not limited to the following examples.
As shown in fig. 3, the invention discloses a mini LED backlight driving method, which is a driving method for increasing the current value of a part of current output ports and correspondingly reducing gray data without changing the gray of LEDs. In the method, when the chip works, m-bit gray data D is extracted from a memory, multiplication operation is firstly carried out on the m-bit gray data D and a preset n-bit global current value Io, and m+n-bit product results are temporarily stored. Then dividing the product result with the preset n-bit channel current value In, sending the quotient to a gray data module for temporary storage, and outputting an n-bit remainder to a selector. The numerical value of gray data is combined with the oscillator signal to generate PWM signal output in the PWM signal generator, meanwhile, whether the remainder of n bits is 0 is judged, if the remainder of n bits is 0, no tail pulse signal is output, and if the remainder of n bits is not 0, the tail pulse signal with 1 unit pulse width is added at a proper position of the PWM signal. And meanwhile, the tail pulse signal is input to a selector and is used for selecting n-bit remainder or n-bit channel current value to output, and when the tail pulse signal is effective, the n-bit remainder is selected to output, otherwise, the n-bit channel current value is output in the PWM signal period.
In this embodiment, the n-bit global current value Io and the n-bit channel current value In are set before the chip normally operates, where each current output channel has a corresponding n-bit channel current value In, and can be set independently. The n-bit global current value Io is one of the default output current values for all channels. The maximum brightness of an individual LED string is determined by multiplying the maximum gray value Dmax by the n-bit global current value Io. If the 12-bit gray level dmax= 4095,5-bit global current value Io is set to 26 unit currents I, the maximum brightness of the single LED string is 4095×t0×26×i/T, where T0 is the PWM unit pulse width and T is the display time of one frame, i.e. the frame refresh period. Since the unit current I, the unit pulse width T0, and the screen refresh period T are all constant values, the maximum brightness of the LED string is set by the maximum gray value and the global current value. And the global current value is fixed when the LED lamp string displays the gray scale, the gray scale of the LED lamp string is completely determined by the gray scale data, and the chip can store the gray scale data of each frame of picture in real time.
As shown in fig. 4, a schematic circuit diagram of the actual application of the method of the present invention is shown, and gray data D and n-bit global current value Io are input to the multiplier. The divider receives the output of the multiplier and the input of the n-bit channel current value In, outputs the quotient result to the gray data module, and outputs the remainder to the selector and the PWM signal generator. The PWM generator generates PWM signals according to the data of the gray data and the oscillator signals, and simultaneously judges whether to generate tail pulse signals with 1 pulse width by combining remainder information. Wherein, the remainder is 0, the tail pulse signal is not generated, and the remainder is not 0, the tail pulse signal is generated at the set position. The tail pulse signals of the PWM generator are simultaneously output to the selector, n-bit channel current values are selected to be output when no tail pulse signals exist, and the n-bit channel current values are respectively connected to n-way switches of S1-Sn, and corresponding reference current outputs are selected. If the 5-bit channel current value is 26 and the corresponding binary value is 11010, the switches of S5, S4 and S2 are closed, and 16I, 8I and 2I are selected for outputting, and the total current is 26 unit currents I. When the PWM signal controls the constant current switch to be turned on, 26I current is output to the LED, so that the brightness control of the LED lamp string is realized. When there is tail pulse signal, the selector will be controlled to output n-bit remainder, which is connected to n-way switch of S1-Sn, respectively, to select corresponding reference current for output. And the tail pulse signal is simultaneously added to the PWM signal, the constant current switch is controlled to be closed, and the current value of the n-bit remainder is output to drive the LED.
Fig. 5 shows an output example of the method of the present invention, in which 12-bit gray data is 2200 (binary 1000 1001 1000), 5-bit global current value 26 (binary 11010), and output 57200 (binary 0 1101 1111 0111 0000) after being multiplied. One of the 5-bit channel current values 29 (binary 11101) is stored in the gray data block by the divider and then output quotient 1972 (binary 0111 1011 0100), with the remainder being 12 (binary 01100). The PWM signal generator generates the calculated gray data value 1972 to generate a uniform PWM pulse signal output, and generates a tail pulse signal with a pulse width of 1 unit pulse width fixed, and a current value generated by the remainder, such as the remainder 12, to output a current value of 12I because the remainder is not 0. The tail pulse signal is shown to be placed at the end of a frame of image, but is not limited to the end of a frame of image, and the placement position of the tail pulse signal can be arbitrarily adjusted according to the requirement. The placement of the tail pulse signal anywhere in a frame of image is within the scope of the present invention. It can be known that the originally set LED brightness is 2200×26= 57200, the output is 1972×29+12=57200 after passing through the circuit of the present embodiment, and the LED brightness is unchanged. However, in this embodiment, the current of the set output channel is increased from 26 unit currents to 29 unit currents, and the increased current increases the voltage drop on the LED string and the line resistor, so as to achieve the purpose of reducing the voltage of the current output port of the driving chip, thereby reducing the power consumption of the driving chip. The LED backlight system has higher efficiency, lower heating and more uniform heat dissipation.
Fig. 6 shows another output example of the method of the present invention, where the 12-bit gray data is 2262 (binary 1000 1101 0110), the 5-bit global current value 26 (binary 11010), and the output 58812 (binary 0 1110 0101 1011 1100) is obtained after the multiplier. One of the 5-bit channel current values 29 (binary 11101) is divided and stored in the gray data block by the output quotient 2028 (binary 0111 1110 1100), with the remainder being 0. The PWM generator uniformly generates the PWM pulse signal output from the calculated gradation data value 2028, and uniformly outputs 2028-unit pulse width pulses having a current amplitude of 29 without generating a tail pulse signal since the remainder is 0.
Fig. 7 is a diagram showing the output effect of the present invention, in which voltage signals and current signals of different output ports are shown respectively, and as shown in fig. 1, R1> R2> Ra, so that the output of the prior art is as shown in fig. 2, the oa output port has the highest voltage during operation, and a large amount of heat is generated by the driving chip. By adopting the technology of the invention, the channel current of the output port of the oa can be increased, as shown in Ioa of fig. 7, and the voltage of the oa when in operation can be reduced after the current is increased, as shown in oa of fig. 7, to the voltage amplitude close to the output port of the o 1. The current of the output port is increased by a proportion In/Io, meanwhile, the PWM pulse duty ratio is reduced by the same proportion (gray data D.times.I0/In), the average current of the output port is the current amplitude multiplied by the PWM duty ratio, namely, the average current of the output port is unchanged, the voltage of the output port is obviously reduced, the average current is unchanged, and therefore the power consumption of the output port of the chip is obviously reduced, and the purpose of reducing the power consumption of the driving chip is achieved.
The above embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or color changes made in the main design concept and spirit of the present invention are still consistent with the present invention, and all the technical problems to be solved are included in the scope of the present invention.
Claims (3)
1. The mini LED backlight driving method is characterized by comprising the following steps of:
s1, when the chip works, m-bit gray data D is extracted from storage, multiplication operation is firstly carried out on the m-bit gray data D and a preset n-bit global current value Io, and m+n-bit product results are temporarily stored;
s2, dividing the product result with a preset n-bit channel current value In, sending the quotient as output gray data to a gray data module for temporary storage, and outputting an n-bit remainder to a selector and a PWM signal generator; wherein, when the current of the output port increases by a proportion In/Io; the PWM pulse duty ratio is reduced by the same proportion, namely the gray data value is reduced by D x Io/In; the average current of the output port is the current amplitude multiplied by the PWM duty cycle, and when the average current of the output port is unchanged, the voltage of the output port is obviously reduced;
s3, the gray data temporarily stored in the gray data module is input into a PWM signal generator, the PWM signal generator generates PWM signals by combining clock period signals output by an oscillator, meanwhile, whether n-bit remainder is 0 or not is judged, if yes, no tail pulse signals are output, and if not, 1 tail pulse signal with unit pulse width is added into the PWM signals;
s4, inputting a tail pulse signal into the selector, selecting n-bit remainder to output a corresponding current when the tail pulse signal is effective, otherwise outputting an n-bit channel current value during the PWM signal;
s5, the constant current switch is turned on to realize PWM gray scale control of the LED constant current peak value.
2. The mini LED backlight driving method according to claim 1, wherein in the step S4, the n-bit channel current value and the n-bit remainder output current value are respectively connected to n-way switches of S1-Sn, and the corresponding reference current output is selected by the selector.
3. The mini LED backlight driving method according to claim 2, wherein the n-bit global current value Io and the n-bit channel current value In are set before the chip normally operates; each current output channel has a corresponding n-bit channel current value In, and can be set independently.
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| CN202310551880.0A CN116312402B (en) | 2023-05-17 | 2023-05-17 | Mini LED backlight driving method |
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| CN202310551880.0A CN116312402B (en) | 2023-05-17 | 2023-05-17 | Mini LED backlight driving method |
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| CN116312402B true CN116312402B (en) | 2023-08-29 |
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| CN117037729B (en) * | 2023-10-08 | 2024-01-16 | 中科(深圳)无线半导体有限公司 | Self-adaptive adjustment mini LED backlight driving method and driving chip thereof |
| CN117082670B (en) * | 2023-10-13 | 2024-01-16 | 中科(深圳)无线半导体有限公司 | Mini LED power supply adjusting method |
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