CN101009957B - LED driving integrated circuit device with the adjustable pulse bandwidth - Google Patents
LED driving integrated circuit device with the adjustable pulse bandwidth Download PDFInfo
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- CN101009957B CN101009957B CN200610001583A CN200610001583A CN101009957B CN 101009957 B CN101009957 B CN 101009957B CN 200610001583 A CN200610001583 A CN 200610001583A CN 200610001583 A CN200610001583 A CN 200610001583A CN 101009957 B CN101009957 B CN 101009957B
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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]
- H05B45/20—Controlling the colour of the light
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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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
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
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Abstract
The related PWM LED drive device IC comprises a PWM control unit to divide the luminance control signal with high resolution and much pulse into multiple low-resolution signal with less pulse, then uses the luminance control signal with more times and low-resolution to increase refresh rate and reduce the LED glint.
Description
Technical field
The present invention relates to a kind of LED driving integrated circuit device of adjustable pulse bandwidth, especially finger is a kind of is arranged at pulse wave frequency range width modulation control unit in the light emitting diode drive device, by improving the device that turnover rate (refresh rate) reduces LED flash (flicker) phenomenon.
Background technology
Light-emitting diode has been widely used in illumination and indicating equipment at present, and the trend that replaces conventional light source has gradually been arranged because of having higher brightness and luminous efficiency.
It is to decide according to its work period (duty cycle refers to that signal is the shared percentage of time of ON in one-period) that the brightness of general light-emitting diode changes.The cycle of the brightness control signal of tradition light-emitting diode driving power management system is about 6.55 milliseconds, and just picture frame speed (frame rate) is 152 times/second.Each brightness is if with 16 signal indication, then can present 2
16=65,536 kinds of brightness.Lower when the brightness of the required performance of light-emitting diode, when just the work period is low, system will export a relative length long not luminous (OFF) clock pulse continuously, make continuous non-luminous time of light-emitting diode longer.Therefore, if use the lower digital camera of image capture frequency to take the image of light-emitting diode, when then playing, the beholder can see flicker (flicker) phenomenon.Picture in the time of by Fig. 1 (a) and (b) can relatively having or not scintillation.
In view of this, the inventor actively seeks the road that solves then, through further investigation and real the checking, obtains " LED driving integrated circuit device of adjustable pulse bandwidth " of the present invention finally.
Summary of the invention
The object of the present invention is to provide a kind of LED driving integrated circuit device that improves the adjustable pulse bandwidth of light-emitting diode turnover rate, avoid taking place the phenomenon that picture is discontinuous or glimmer.
For reaching above-mentioned purpose, LED driving integrated circuit device of the present invention comprises a pulse wave width modulation (Pulse Width Modulation, PWM) control unit and a LED driving circuit at least.The drive integrated circult device reads outside brightness settings and is sent to the pulse wave width modulation control unit, relative according to the brightness settings adjustment again work period (duty cycle), export the brightness control signal of specific pulse wave width modulation cycle (PWM cycle). and brightness control signal produces normally based on clock pulse (clock-based). the brightness control signal may command LED driving circuit of output utilized again, make outside light-emitting diode show described relatively brightness control signal and show different luminosity. wherein, the pulse wave width modulation control unit, can be with the brightness control signal of high color range (gray-scale) resolution, be divided into the brightness control signal of many low color range resolution, and keep original high color range resolution. via in the identical time but show the brightness control signal of more times several low color range resolution, and under the situation that this pulse wave width modulation control unit remained unchanged in the work period of brilliance control signal, by a default algorithm with a described pulse wave width modulation luminous continuous time in the cycle, be divided into main light period and less important light period, again main light period is cut into several parts of minor cycles, and described several parts of minor cycles and described less important light period are scattered in whole described pulse wave width modulation in the cycle, after this main light period cuts into the minor cycle, again this less important light period cutting was dispersed in each minor cycle of this main light period, and summation cycle time of the minor cycle after cutting apart equals not cut apart preceding summation cycle time, to improve luminous number of times, can form higher turnover rate (refresh rate).
Understand the described meaning of content of the present invention for making, special that important nominal definition is as follows:
1. pulse wave width modulation cycle: pulse width modulation (PWM) cycle, refer to represent the complete required time of luminance signal, its brightness is decided by the ratio of the time of luminous in the cycle (ON) and not luminous (OFF).
2. work period: duty cycle refers to that the time of luminous (ON) accounts for the percentage of time in pulse wave width modulation cycle.
3. turnover rate: refresh rate refers to the bright dark number of times of light-emitting diode per second.For people's eyes, because the cause of the persistence of vision, be secretly or to glimmer as long as turnover rate greater than per second 70 times, just is hard to tell Chu's light-emitting diode and is bright, only get the bright-dark degree of color.
4. color range resolution: gray-scale resolution refers to the expressible exponent number of light-emitting diode luminance or bright-dark degree.
Under the situation about remaining unchanged in the work period of brightness control signal (duty cycle), above-mentioned pulse wave width modulation control unit can be by a default algorithm, continuous time with luminous (ON) in the pulse wave width modulation cycle (PWMcycle), be divided into main light period and less important light period; Again main light period is cut into several parts of minor cycles, and several parts of minor cycles and less important light period were scattered in the whole pulse wave width modulation cycle (PWM cycle), the number of times of luminous to improve (ON) forms higher turnover rate (refresh rate).
Above-mentioned less important light period can the minor cycle that main light period cuts into finish after, more less important light period was also cut in each minor cycle that is dispersed to main light period.Above-mentioned main light period also can on average cut into the minor cycle of several identical equal portions.
Description of drawings
Fig. 1 shows the scintillation when light-emitting diode shows again after photography.
Fig. 2 utilizes the schematic diagram of algorithm cutoff signal front and back for simple declaration.
Embodiment
Because the brightness of light-emitting diode variation is to decide the work period (duty cycle) according to brightness control signal.Lower when the brightness of the required performance of light-emitting diode, when just the work period is low, system will export the long continuous clock pulse of OFF of a relative length, make continuous non-luminous time of light-emitting diode longer.Therefore, when taking the image of light-emitting diode, will produce flicker (flicker) phenomenon as if the lower digital camera of use image capture frequency.
Desire to overcome above-mentioned scintillation, one of solution promptly is to reduce the continuous clock pulse of not luminous (OFF), and on average is scattered in this cycle as far as possible.During actual design, then on average be scattered in this cycle as far as possible, improve turnover rate (refresh rate), reach identical purpose by the continuous clock pulse of cutting luminous (ON) and with it.
The drive integrated circult device that the present invention is used to improve the light-emitting diode turnover rate mainly comprises a pulse wave width modulation (Pulse Width Modulation, PWM) control unit, this drive integrated circult device can be sent to the brightness control signal of outside this pulse wave width modulation control unit, and after the output signal comparison with brightness control signal and this pulse wave width modulation control unit, cut again and export.Wherein under the situation that this pulse wave width modulation control unit remained unchanged in the work period of brightness control signal (duty cycle), cut the continuous clock pulse of not luminous (OFF) or luminous (ON) in each cycle by a default algorithm, and it on average is scattered in this cycle as far as possible, to improve turnover rate.
Formula (I) below pulse wave width modulation control unit of the present invention uses and (I-1) the clock pulse number in the pulse wave width modulation cycle (PWM cycle) was assigned in the inferior cycle:
2
n＝[(2
m-1)×2
k]×2
n-m-k+[2
k×2
n-m-k]×1 (I)
＝[2
m×2
k]×2
n-m-k (I-1)
Wherein, n is a positive integer, and m is 0 or less than the positive integer of n, and k is 0 or less than the positive integer of m; Then originally have 2
nThe one-period of individual clock pulse number:
A. according to formula (I), can be cut into 2
N-m-k+ 1 time cycle, wherein 2
N-m-kIndividual cycle has (2
m-1) * 2
kIndividual clock pulse number, Shu cycle has 2
k* 2
N-m-kIndividual clock pulse number; Perhaps
B. according to formula (I-1), can be cut into 2
N-m-kIn individual cycle, then each time cycle has 2
m* 2
kIndividual clock pulse number.
To these two kinds of patterning methods, 2
kBe the frequency elimination multiple, be used for required cutting number when low.
In addition, can utilize formula (II) that the M of PWM in the cycle luminous (ON) clock pulse number done cutting:
M＝[A×2
k]×2
n-m-k+B×1 (II)
＝[A×2
k+i]×2
n-m-k (II-1)
Wherein, M is a positive integer, and A is 0 or less than the positive integer of M, n is a positive integer, and m is 0 or less than the positive integer of n, and k is 0 or less than the positive integer of m, and B is 0 or less than 2
k* 2
N-m-kPositive integer.M clock pulse number originally then:
A. according to formula (II), can be cut into (2
N-m-k+ 1) individual cycle, wherein 2
N-m-kIndividual cycle has A * 2
kIndividual clock pulse number, 1 cycle has B clock pulse number; Perhaps
B. according to formula (II-1), can be cut into 2
N-m-kIn individual cycle, each time cycle has (A * 2
k+ i) individual clock pulse number, wherein i is 0 or smaller or equal to 2
kPositive integer, and the i value in each time cycle is added up and is equaled B.
At the patterning method of formula (I) and formula (II) derivation, can be having (2
m-1) * 2
kA * 2 in the inferior cycle of individual clock pulse number
kIndividual clock pulse is set as the clock pulse of luminous (ON), and remaining one has 2
k* 2
N-m-kB clock pulse in the inferior cycle of individual clock pulse number is set as the clock pulse of luminous (ON).
At the patterning method of formula (I-1) and formula (II-1) derivation, can be having 2
m* 2
k(A * 2 in the inferior cycle of individual clock pulse number
k+ i) individual clock pulse is set as the clock pulse of luminous (ON).
So, can keep improving turnover rate under the constant situation of work period.Because digital development of science and technology is at a tremendous pace, therefore scope necessity that there is no particular restriction of n or M in the above-mentioned algorithm, and look closely the arithmetic speed of electronic calculator and decide.
Fig. 2 is the schematic diagram before and after the above-mentioned algorithm cutoff signal for simple declaration utilizes.Wherein, waveform (a) is the PWM clock pulse, and each cycle comprises 16 clock pulses; Waveform (b) is for before cutting, and continuous 9 clock pulses are luminous (ON) in this cycle, and continuous 7 clock pulses are not luminous (OFF).(A) and (B) illustrate respectively that turnover rate (refresh rate) is 4 and 2 o'clock cutting situation.
(A) turnover rate is 4
Utilize formula (I), establish k=0, with waveform (a) cut into four minutes one:
16＝2
4＝(2
2-1)×2
2+2
2×1
Each of cutting back waveform (c) has 2 in time cycle
2=4 clock pulses, totally 2
2=4 cycles.Utilize 9 luminous clock pulses of formula (II) cutting again:
9＝2×2
2+1
Comprise that continuous 2 clock pulses are luminous in each time cycle, continuous 2 clock pulses are not luminous, and calculated the clock pulse of luminous (ON) this moment less, can be inserted in last clock pulse in first time cycle, i.e. the shown position of dotted line.
(B) turnover rate is 2
Waveform (d) is the clock pulse behind two times of waveform (a) frequency eliminations; Utilize formula (I), establish k=1, then:
16＝2
4＝(2
2-1)×2
1×2
1+2
1×2
1
Each of cutting back waveform (e) has 2 in time cycle
2=4 clock pulses as waveform (d), 8 clock pulses, totally 2 cycles as waveform (a).Utilize 9 luminous clock pulses of formula (II) cutting again:
9＝2×2
1×2
1+1
Comprise that 2 clock pulses as waveform (d) are luminous in each time cycle, continuous 2 clock pulses as waveform (d) are not luminous; Calculated one luminous (ON) clock pulse as waveform (a) this moment less, can be inserted in last clock pulse in first time cycle, i.e. the shown position of dotted line.
Design by this, then the continuous clock pulse of not luminous (OFF) on average is scattered in this cycle as far as possible, and turnover rate is improved, and then reduces scintillation; But its work period, (duty cycle) still kept 9/16, or the brightness performance still is 9/16ths of a high-high brightness; On visual effect, its brightness is identical, but the picture continuity is better.
By a design example this algorithm is described with next.In this design example, the n=16 of calculation formula can count with one 6 inferior counter (sub_cnt) by one 16 main counter (main_cnt); Wherein 16 main counter can count to (2 by 0
16-k-1), k=0～6, and wherein preceding 10 counters (pri_cnt) as the cutting back time cycle, the m=10 that then calculates formula can count to (2 by 0
10-1); 6 inferior counter then counts to (2 at preceding 10 (pri_cnt) of each 16 digit counters (main_cnt)
10-1) just counts the time, can count to (2 by 0 along with clock pulse changes
6-1) just not Shu shine the order of ascending power surely; The frequency elimination signal then provides (fdiv_cnt) by another 6 digit counter, can count to (2 by 0
6-1).
In addition, count mode (cb_sel) can have 2 kinds of selections, and when being set at 16, main counter adds 1 at the edge that rises of each PWM clock pulse; When being set at 12, then main counter adds 16 at the edge that rises of each PWM clock pulse.
Below in the explanation, " 2 ' bxx ' " 2 is meant two, and b is meant bit, and xx then is a numerical value.(n=16, m=10), and the cutting number gets 2 when count mode is set at 16
0, 2
2, 2
4Or 2
6The time, the cutting mode of this preferred configuration example (cm_sel) can have following 4 kinds of selections:
(1) cm_sel==2 ' b00 ', k=0, n-m-k=6, then counter is configured to
(the inferior cycle rate counter of 10-bit) * (2
6The cutting number)+(the inferior counter of 6-bit) main counter is per 2
0The edge that rises of individual PWM clock pulse adds 1, and inferior cycle rate counter also is.Inferior counter is then calculated to (2 at each time cycle rate counter
10-1) changes the time to next count value.
(2) cm_sel==2 ' b01 ', k=2, n-m-k=4, then counter is configured to
(the inferior cycle rate counter of 10-bit) * (2
2The frequency elimination multiple) * (2
4The cutting number)+(the inferior counter of 6-bit)
Main counter is per 2
2The edge that rises of individual PWM clock pulse adds 1, and inferior cycle rate counter also is.
Inferior counter is then calculated to (2 at each time cycle rate counter
10-1) edge that rises according to the PWM clock pulse time changes to next count value, because time cycle rate counter is per 2
2The edge that rises of individual PWM clock pulse just adds 1, and inferior counter changes count value 4 times altogether during this section.
(3) cm_sel==2 ' b10 ', k=4, n-m-k=2, then counter is configured to
(the inferior cycle rate counter of 10-bit) * (2
4The frequency elimination multiple) * (2
2The cutting number)+(the inferior counter of 6-bit)
Main counter is per 2
4The edge that rises of individual PWM clock pulse adds 1, and inferior cycle rate counter also is.
Inferior counter is then calculated to (2 at each time cycle rate counter
10-1) edge that rises according to the PWM clock pulse time changes to next count value, because time cycle rate counter is per 2
4The edge that rises of individual PWM clock pulse just adds 1, and inferior counter changes count value 16 times altogether during this section.
(4) cm_sel==2 ' b11 ', k=6, n-m-k=0, then counter is configured to
(the inferior cycle rate counter of 10-bit) * (2
6The frequency elimination multiple) * (2
0The cutting number)+(the inferior counter of 6-bit)
Main counter is per 2
6The edge that rises of individual PWM clock pulse adds 1, and inferior cycle rate counter also is.
Inferior counter is then calculated to (2 at each time cycle rate counter
10-1) edge that rises according to the PWM clock pulse time changes to next count value, because time cycle rate counter is per 2
6The edge that rises of individual PWM clock pulse just adds 1, and inferior counter changes count value 64 times altogether during this section.
(n=12, m=6), and the cutting number gets 2 when count mode is set at 12
0, 2
2, 2
4Or 2
6The time, the cutting mode of this preferred configuration example (cm_sel) can have following 4 kinds of selections:
(1) cm_sel==2 ' b00 ', k=0, n-m-k=6, then counter is configured to
(the inferior cycle rate counter of 6-bit) * (2
6The cutting number)+(the inferior counter of 6-bit)
Main counter is per 2
0The edge that rises of individual PWM clock pulse adds 16, and inferior cycle rate counter also is.
Inferior counter is then calculated to (2 at each time cycle rate counter
6-1) changes the time to next count value.
(2) cm_sel==2 ' b01 ', k=2, n-m-k=4, then counter is configured to
(the inferior cycle rate counter of 6-bit) * (2
2The frequency elimination multiple) * (2
4The cutting number)+(the inferior counter of 6-bit)
Main counter is per 2
2The edge that rises of individual PWM clock pulse adds 16, and inferior cycle rate counter also is.
Inferior counter is then calculated to (2 at each time cycle rate counter
6-1) edge that rises according to the PWM clock pulse time changes to next count value, because time cycle rate counter is per 2
2The edge that rises of individual PWM clock pulse just adds 1, and inferior counter changes count value 4 times altogether during this section.
(3) cm_sel==2 ' b10 ', k=4, n-m-k=2, then counter is configured to
(the inferior cycle rate counter of 6-bit) * (2
4The frequency elimination multiple) * (2
2The cutting number)+(the inferior counter of 6-bit)
Main counter is per 2
4The edge that rises of individual PWM clock pulse adds 16, and inferior cycle rate counter also is.
Inferior counter is then calculated to (2 at each time cycle rate counter
6-1) edge that rises according to the PWM clock pulse time changes to next count value, because time cycle rate counter is per 2
4The edge that rises of individual PWM clock pulse just adds 1, and inferior counter changes count value 16 times altogether during this section.
(4) cm_sel==2 ' b11 ', k=6, n-m-k=0, then counter is configured to
(the inferior cycle rate counter of 6-bit) * (2
6The frequency elimination multiple) * (2
0The cutting number)+(the inferior counter of 6-bit)
Main counter is per 2
6The edge that rises of individual PWM clock pulse adds 16, and inferior cycle rate counter also is.
Inferior counter is then calculated to (2 at each time cycle rate counter
6-1) edge that rises according to the PWM clock pulse time changes to next count value, because time cycle rate counter is per 2
6The edge that rises of individual PWM clock pulse just adds 1, and inferior counter changes count value 64 times altogether during this section.
The design's example is done cutting according to formula (II) with the time of luminous (ON) again, here total M the clock pulse number of hypothesis:
M＝A×2
k×2
n-m-k+B
Whenever the count value of inferior cycle rate counter during less than A, control signal all is made as ON; When the count value of inferior cycle rate counter reaches 2
m-1 o'clock, and the count value of inferior counter is during less than B, and control signal also is made as ON.
Via above setting, the design's example provides the counting mode of two kinds of different resolutions or accuracy (resolution), change speech, 16 counting makes a pulse wave width modulation cycle (PWM cycle) have 65,536 clock pulses, and 12 counting makes each pulse wave width modulation cycle (PWM cycle) that 4,096 clock pulses be arranged.In addition,, respectively provide four kinds of different cutting methods, make turnover rate can reach original 1 times these two kinds of different counting modes, 4 times, 16 times or 64 times.
As shown in the above description, drive integrated circult device provided by the invention comprises a pulse wave width modulation (PWM) control unit, the continuous clock pulse of luminous (ON) in each cycle of brightness control signal can be cut.Algorithm default in the PWM control unit determines cutting mode, then can improve turnover rate (refresh rate) by this, avoids scintillation.But it is noted that there is no particular restriction for the algorithm that the present invention uses, above-mentioned algorithm only is an example wherein.For reaching specific requirement, can further derive other algorithm, also can adopt other cutting mode, so these changes in modification should belong to the scope of the invention.
Claims (6)
1. the LED driving integrated circuit device of an adjustable pulse bandwidth, it is characterized in that, at least comprise a pulse wave width modulation control unit and a LED driving circuit, this drive integrated circult device reads outside brightness settings and is sent to described pulse wave width modulation control unit, again according to the described relative work period of brightness settings adjustment, export the brightness control signal in specific pulse wave width modulation cycle, utilize described brightness control signal to control described LED driving circuit again, make external light-emitting show different luminosity; Wherein:
Described pulse wave width modulation control unit, brightness control signal with a high color range resolution, be divided into the brightness control signal of many low color range resolution, and keep original high color range resolution, via in the identical time but show the brightness control signal of more times several low color range resolution, and under the situation that this pulse wave width modulation control unit remained unchanged in the work period of brightness control signal, by a default algorithm with a described pulse wave width modulation luminous continuous time in the cycle, be divided into main light period and less important light period, again main light period is cut into several parts of minor cycles, and described several parts of minor cycles and described less important light period are scattered in whole described pulse wave width modulation in the cycle, after this main light period cuts into the minor cycle, again this less important light period cutting was dispersed in each minor cycle of this main light period, and summation cycle time of the minor cycle after cutting apart equals not cut apart preceding summation cycle time, to improve luminous number of times, form higher turnover rate.
2. the LED driving integrated circuit device of adjustable pulse bandwidth as claimed in claim 1 is characterized in that, this main light period is on average cut into the minor cycle of several identical equal portions.
3. the LED driving integrated circuit device of adjustable pulse bandwidth as claimed in claim 1 is characterized in that, the brightness control signal that this pulse wave width modulation control unit is exported is based on clock pulse and produces.
4. the LED driving integrated circuit device of adjustable pulse bandwidth as claimed in claim 1 is characterized in that, this default algorithm uses following formula (I), with pulse wave width modulation 2 in cycle
nIndividual clock pulse number was assigned in time cycle:
2
n＝(2
m-1)×2
k×2
n-m-k+2
k×2
n-m-k (I)
Wherein, n is a positive integer, and m is 0 or less than the positive integer of n, and k is 0 or less than the positive integer of m;
Then originally have 2
nThe one-period of individual clock pulse number can be cut into 2
N-m-k+ 1 time cycle, wherein 2
N-m-kIndividual cycle has (2
m-1) * 2
kIndividual clock pulse number, Shu time cycle has 2 in addition
k* 2
N-m-kIndividual clock pulse number; Also can be cut into 2
N-m-kIn individual cycle, the cycle has 2 each time
m* 2
kIndividual clock pulse number; To these two kinds of patterning methods, 2
kBe the frequency elimination multiple.
5. the LED driving integrated circuit device of adjustable pulse bandwidth as claimed in claim 1 is characterized in that, this default algorithm utilizes following formula (II), and the M of pulse wave width modulation in the cycle luminous clock pulse number done cutting:
M＝A×2
k×2
n-m-k+B (II)
Wherein, M is a positive integer, and A is 0 or less than the positive integer of M, n is a positive integer, and m is 0 or less than the positive integer of n, and k is 0 or less than the positive integer of m, and B is 0 or less than 2
k* 2
N-m-kPositive integer;
A * 2 then
k* 2
N-m-kThis is main light period, and this is less important light period for B; M clock pulse number can be cut into (2
N-m-k+ 1) in individual cycle, also can cut into 2
N-m-kIndividual cycle; For previous patterning method, wherein 2
N-m-kIndividual cycle has A * 2
kIndividual clock pulse number, another time cycle has B clock pulse number; For second patterning method, then each time cycle has A * 2
k+ i clock pulse number, wherein i is 0 or smaller or equal to 2
kPositive integer, and the i value in each time cycle is added up and is equaled B.
6. the LED driving integrated circuit device of adjustable pulse bandwidth as claimed in claim 1 is characterized in that, this default algorithm is to contain 2 with one
nIndividual clock pulse and wherein have the pulse wave width modulation cycle of the luminous clock pulse of M to cut into:
A. (2
N-m-k+ 1) individual cycle, wherein 2
N-m-kIndividual cycle has (2
m-1) * 2
kIndividual clock pulse number all has A * 2 in these times cycle
kIndividual clock pulse is luminous, and another time cycle has 2
k* 2
N-m-kIndividual clock pulse number, it is luminous that B clock pulse number arranged in this time cycle; Perhaps
B.2
N-m-kIn individual cycle, then each time cycle has 2
m* 2
kIndividual clock pulse number wherein has A * 2
k+ i clock pulse is luminous, and wherein i is 0 or smaller or equal to 2
kPositive integer, and the i value in each time cycle is added up and is equaled B;
Wherein, M is a positive integer, and A is 0 or less than the positive integer of M, n is a positive integer, and m is 0 or less than the positive integer of n, and k is 0 or less than the positive integer of m, and B is 0 or less than 2
k* 2
N-m-kPositive integer.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610001583A CN101009957B (en) | 2006-01-24 | 2006-01-24 | LED driving integrated circuit device with the adjustable pulse bandwidth |
| EP06005074A EP1814365B1 (en) | 2006-01-24 | 2006-03-13 | LED driving device with pulse width modulation |
| ES06005074T ES2388069T3 (en) | 2006-01-24 | 2006-03-13 | LED control device with pulse width modulation |
| PL06005074T PL1814365T3 (en) | 2006-01-24 | 2006-03-13 | LED driving device with pulse width modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610001583A CN101009957B (en) | 2006-01-24 | 2006-01-24 | LED driving integrated circuit device with the adjustable pulse bandwidth |
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| Publication Number | Publication Date |
|---|---|
| CN101009957A CN101009957A (en) | 2007-08-01 |
| CN101009957B true CN101009957B (en) | 2010-05-12 |
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| CN200610001583A Active CN101009957B (en) | 2006-01-24 | 2006-01-24 | LED driving integrated circuit device with the adjustable pulse bandwidth |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1814365B1 (en) |
| CN (1) | CN101009957B (en) |
| ES (1) | ES2388069T3 (en) |
| PL (1) | PL1814365T3 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI407415B (en) * | 2009-09-30 | 2013-09-01 | Macroblock Inc | Scan-type display control circuit |
| CN102044211B (en) * | 2009-10-12 | 2013-06-12 | 聚积科技股份有限公司 | Scanning type display device control circuit |
| CN102215620B (en) * | 2010-04-08 | 2014-05-28 | 明阳半导体股份有限公司 | Device and method for driving light-emitting diode (LED) |
| CN101937648B (en) * | 2010-09-03 | 2012-07-04 | 南京德普达电子技术有限公司 | Ordinary constant flow source driving chip-based method for controlling grey scale display of light-emitting diode (LED) |
| CN102054434B (en) * | 2010-12-21 | 2013-04-17 | 苏州君嬴电子科技有限公司 | Light-emitting diode (LED) display system and method having pulse scattering mode |
| CN103000123A (en) * | 2012-08-29 | 2013-03-27 | 北京集创北方科技有限公司 | Pulse width regulating device |
| CN103874270B (en) * | 2012-12-17 | 2016-04-20 | 普诚科技股份有限公司 | LED driving method and device |
| TWI564858B (en) * | 2015-06-24 | 2017-01-01 | Macroblock Inc | Light - emitting diode control method |
| US9468051B1 (en) | 2015-08-27 | 2016-10-11 | National Yunlin University Of Science And Technology | Light emitting diode linear light modulator with temperature compensation |
| CN105717436A (en) * | 2016-01-27 | 2016-06-29 | 江西联星显示创新体有限公司 | Detection method and system using CABC signals to change LED voltage automatically |
| US11615736B2 (en) * | 2020-09-09 | 2023-03-28 | Texas Instruments Incorporated | Light-emitting diode (LED) display driver with blank time distribution |
| CN113793564B (en) * | 2021-09-16 | 2023-04-25 | 中科芯集成电路有限公司 | Multi-region optimization OSPWM algorithm |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1162826C (en) * | 2000-04-21 | 2004-08-18 | 索尼公司 | Modulating circuit, image display therewith and modulating method |
| CN1201636C (en) * | 2000-02-03 | 2005-05-11 | 皇家菲利浦电子有限公司 | Supply assembly for LED lighting module |
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| US7071762B2 (en) * | 2001-01-31 | 2006-07-04 | Koninklijke Philips Electronics N.V. | Supply assembly for a led lighting module |
| US6861810B2 (en) | 2001-10-23 | 2005-03-01 | Fpd Systems | Organic electroluminescent display device driving method and apparatus |
| JP3856001B2 (en) * | 2004-01-26 | 2006-12-13 | セイコーエプソン株式会社 | Display controller, display system, and display control method |
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2006
- 2006-01-24 CN CN200610001583A patent/CN101009957B/en active Active
- 2006-03-13 PL PL06005074T patent/PL1814365T3/en unknown
- 2006-03-13 ES ES06005074T patent/ES2388069T3/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1201636C (en) * | 2000-02-03 | 2005-05-11 | 皇家菲利浦电子有限公司 | Supply assembly for LED lighting module |
| CN1162826C (en) * | 2000-04-21 | 2004-08-18 | 索尼公司 | Modulating circuit, image display therewith and modulating method |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2388069T3 (en) | 2012-10-08 |
| EP1814365A1 (en) | 2007-08-01 |
| PL1814365T3 (en) | 2012-11-30 |
| EP1814365B1 (en) | 2012-05-23 |
| CN101009957A (en) | 2007-08-01 |
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