CN1272757C - Method and apparatus for driving a digital display by distributing PWM pulses over time - Google Patents

Method and apparatus for driving a digital display by distributing PWM pulses over time Download PDF

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Publication number
CN1272757C
CN1272757C CNB01807359XA CN01807359A CN1272757C CN 1272757 C CN1272757 C CN 1272757C CN B01807359X A CNB01807359X A CN B01807359XA CN 01807359 A CN01807359 A CN 01807359A CN 1272757 C CN1272757 C CN 1272757C
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pulse
output
signal
signals
time
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CN1421028A (en
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安东尼·范德文
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Lighthouse Technologies Ltd
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Lighthouse Technologies Ltd
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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
    • 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
    • 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
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/12—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using electroluminescent elements
    • G09G3/14—Semiconductor devices, e.g. diodes
    • 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
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of El Displays (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Liquid Crystal (AREA)

Abstract

The present invention provides a method and apparatus for distributing a pulse width modulated signal over a period of time. When applied to a digital display, the present invention provides signals representing digital data that drives display elements, including a plurality of smaller pulses distributed over an update time. Logic circuitry is provided to generate a plurality of combinable signals such that incoming data may be combined with the signals to determine the composite signal generated as the final output. The individual signals are generated by identifying the least significant bit of a counter which subdivides the appropriate time period into smaller time intervals and generating a pulse on a plurality of outputs, each unique least significant bit being identified on a separate output, the successive common least significant bits being identified by generating pulses on successive common least significant bits on the same output.

Description

Drive the method and apparatus of digital indicator by distributing PWM pulse in whole period
Technical field
The invention relates to the method and apparatus that drives digital indicator by the width-modulation pulse that distributes in time.Particularly, though be not only to have, this method and apparatus can be implemented in the field such as the digital indicator screen of LED or LCD screen or projector, plasm TV or other display device screens that use numerical informations.
Background technology
Recently, the digital indicator screen has become main.These screens have various ways, though and the present invention generally will describe with reference to the LED screen, think that easily identical consideration can be applicable to other digital indicator systems.
Lifting a LED screen is example, and it generally can be provided by the screen that comprises a plurality of pixels.Each pixel can comprise a plurality of different color LED elements, and the Color Range of hope is provided.And, can comprise redness, blueness and green LED element on usually.
During one sets, on pixel, provide specific color, can provide Color Range by varying strength being provided respectively to the illumination of red, green and blue element.
Along with the use of digital indicator, the variation on the intensity of each LED element is generally recently reached by the relative time percentage that each element is energized.
This digital indicator can be operated under multiple renewal frequency.Typical frequencies is about 60Hz, and continuous relatively clear signal is provided to human eye.At 60Hz frequency place, each pixel need show wishes color, and in during 1/60 second suitable energy level is provided to each LED element.
When data are provided to LED and LED substantially in transient operation with digital form, only the suitable part of this reproducting periods is come the illumination LED element, and provide energy level variations in the reproducting periods, utilize digital indicator, generally not by in time durations, providing higher or than low-lying level, but, need in this period, provide the relevant number percent of average color intensity, thereby operation related elements by providing one group of power level to come only in the number percent of reproducting periods, to come illumination component.Often have with the electric current that is applied to element and change corresponding nonlinear response.Therefore, the general time quantum of more wishing to change the element excited target, but not change the immediate current of being supplied, and it maintain whole during in.
Suppose that reproducting periods serves as reasons time of " T " expression, by as required the suitable element illumination of the suitable part of " T " being provided the varying strength rank of each color.
Perhaps the straightforward procedure of implementing this function be during " T " begin to locate switching device, and before element is closed during suitable part encourage this element.For example, if wish that color has the redness of 50% intensity, then in preceding half time durations " T " underexcitation red element.By from during begin promptly to change time durations " T " this part varying strength is provided.
When this system is utilized, produce certain visual effects.This visual effect is called as " flash of light ".
Though the mechanism of this visual effect is all understood as yet, it is believed that this effect is because of energy uneven distribution and producing in time durations " T ".
As pointing out in the precedent, only in preceding half time durations " T ", provide 50% intensity to come exciting element.If image is static, then " T " similarly encouraged during the follow-up time, and is evenly distributed and do not produce special visual distortion.Yet, moving image as if one and be projected on the screen, the borderline pixel of this mobile image need obviously change intensity continuously between the update cycle.
If consider that an element is energized 50% during one-period, and in following one-period, be energized 25%, then in to preceding half first reproducting periods and preceding 1/4th next reproducting periods, the simple execution of element provides correct average energy to each reproducting periods.Yet the beginning of reproducting periods and end and observer's thought is asynchronous.If consider a little during the long period, for example, " T " adds 25% during the starting point start time in first cycle in two cycles, then both's generation in one 1.25 " T " time durations during 50% " T " and 25% " T " excitation.Producing average energy in causing during 60% 1.25 " T " distributes.Significantly, the intensity between this extended period in addition than the very first time during the intensity of " T " stronger, the intensity of " T " also is eager to excel during the follow-up time of reduction.
The visual effect of flash of light produces the bright or concealed wire of trailing the mobile image that crosses screen.
On general, adopt two methods to attempt and overcome this effect.
First method is to reduce the update cycle significantly.Though do not stop effect to take place at this, obviously the update cycle can reduce human eye effect clearly faster.General this effect that goes up moves faster and becomes clear on the image crossing display.The difficulty of this proposal is that reducing in the update cycle obviously increases the required processing procedure of display, thereby and makes the hardware complexity that relates to increase cost.Most economical reproducting periods is only fast slightly than the detection rates of human eye.
Described system uses width modulation " PWM " signal that desirable strength is provided.As previously mentioned, simple form is only the number percent of " T " during the length of single pulse and the desired time to be complementary.
Owing to increase the cost difficulty of update cycle and still will solve the flash of light problem, utilized additive method the pulse Len req in the time durations " T " to be processed into a series of pulses that are distributed in this time durations.The average pulse that spreads all over time durations " T " distributes and has overcome this problem.
A straightforward procedure of implementing this function is that time durations " T " is divided into a series of discrete time intervals.These time intervals can be expressed as represent 50% during " T " during " T " square, represent 25% during second square of " T ", represent another square of " T " during 12.5% or the like.
During being distributed in discretely, these time intervals in " T " time,, then can utilize 50% and 12.5% discrete time interval that this value is provided if be desirable to provide 5/8 intensity of available full strength.If in whole time durations " T ", 50% and 12.5% the discrete time district be non-conterminous time interval, then take place on average.Usually, 50% time interval can be adjacent with an end points of time durations " T ", and 25% is interval 50% interval adjacent with this, and 12.5% is interval and 25% interval adjacent and away from 50% interval or the like.5/8 or 62.5% intensity provides two square times, and for example the display device of LED element is illuminated during this period, and is separated by 25% unexcited time interval of element.
Interval number according to time durations " T " is subdivided into can provide more complicated configuration.
Yet as if one in the approaching discrete time durations border of the intensity of pixel, this kind of system still has any problem.For example, if intensity will be 50%, then still provide intensity by single pulse at an end points place of time durations " T ".Similarly, will be just over the number percent of this intensity 50% value and represent in a smaller again pulse of time interval " T " other end usually by single 50% pulse.This not too influences during All Time in " T " average pulse during near those special time square borders at intensity level.
For better solution is provided, nearest product has had the memory body of Eprom form.Eprom comprises that question blank is to provide required average signal.
The exemplary device of this enforcement is shown among Fig. 1.In order to illustrate, the indivedual lines in Eprom memory body typical case memory body position 128 and 64 partly are provided among Fig. 2.
Please refer to Fig. 1, the simplification that device is shown partly drives single LED element 1.
On general, vision signal or similar signal can be received with analog form by total system, and convert digital format to.Have in a pixel in the situation of display of redness, blueness and green individual elements, data are expressed as the digital number of the strength grade of representing this specific LED in during this renewal cycling time.
As simplifying at this in form to explanation demonstrates, data can be provided as the digital signal 2 of 8 binary digit forms.Bits number in the binary digit signal only depends on the gradient number of each component strength.8 signals provide LED element 1 to represent 256 discrete binary digits of 256 independent strength grades in time durations " T ".This can change as required and it should be noted that when being provided to the pixelation screen with red, blue and green assembly, the last color of pixel is decided by the blending ratio of each in these three elements at least.Therefore, 256 gradients of each color provide the Color Range of the integral body that surpasses 16.7 hundred ten thousand last pixel in three colors.
As in this known technology example, showing that data-signal is provided to Eprom 3.On the typical case, Eprom 3 will keep at least 256 discrete memory body positions, and each position is at sending into the possible strength grade that data are wished.
What be connected with Eprom is counter 4, and it is used as 8 digit counters of coupling in this known technology embodiment.Clock 5 actuation counter 4.Then explain orally as in describing, the bits number of counter need not the number of matched data position, and then can increase if desired.Bits number unlikely reduces.Because this will reduce some the discrete degree to the LED1 usable intensity.
Clock 5 actuation counter make the update cycle " T " to be separated into many discrete less time portion.In the situation of 8 digit counters 4, this will comprise 256 discrete time portion, and each discrete time portion is represented by the continuous binary bit number of counter 4.
In the single memory body position in Eprom, the memory body position can similarly comprise a sequence bit, and the number of the discrete value that the length of sequence is produced by counter 4 decides.In this specific examples that shows in Fig. 1, each the memory body position in Eprom can comprise a string 256 independent positions.
In order to explain the operation of this known technology embodiment, can be with reference to figure 2, wherein demonstrate a part of memory body position of the memory body position of representing 128 or 64 data input.These are that the canonical dissection of memory body position helps illustrate this prior art.
If data 2 wish the time of driving LED be 50% during, then data 2 can be provided as and 256 of 8 bit representations 128 binary bit numbers that equate in may the binary bit numbers.As preceding 16 in 128 some 256 positions that demonstrate in the memory body position 128 of the memory body position that shows among Fig. 2.
When counter 4 comes circulation time by in 256 discrete numbers that driven by clock 5 each, in 128 memory body positions one continuously the position be considered.As showing in 16 before this, second of each in 128 address comprises that one " 1 " come illumination LED 1.
The result is that the output 6 of Eprom 3 comprises 128 individual pulses, and its sum reaches 50% of whole time durations " T ".
Please refer in Eprom 3 memory body position with the data 2 of the binary form representative of numeral 64, see for preceding 16 that can from Fig. 2, show, each the 4th comprises one " 1 ", makes output 6 comprise the pulse of 64 discrete distributions that add up to 25% pot life " T ".
As in this known technology, showing, Eprom at each discrete send into data-signal successfully pulse is distributed in the time " T " during in.
In fact, this Eprom can produce signal at a plurality of independent LED elements.Therefore, need not to provide separately Eprom to each LED element.Can be by the actual number of the LED element 1 of each Eprom 3 addressing, not only can be by the simple speed decision that surpasses Eprom 3, can also decide by the ability that a communication path is provided to also with the LED element 1 of abundant speed operation.
With present skill level, still need to be provided with any true paragraph that a plurality of Eprom come the driving display screen.Typical known technology system can utilize 6 Eprom on the drive plate of 512 pixel portions sections that respectively comprise 3 LED elements.
Though this known technology has overcome the problem of flash of light, use Eprom and be connected to the driving circuit of LED very expensive.Though the number of required Eprom can be by comprising that multiplexer or other technologies make Eprom carry out addressing to more LED and reduce, these multiplexers also increase whole cost.
Goal of the invention
The purpose of this invention is to provide a kind of by drive the method and apparatus of digital indicator at whole section time distributing PWM signal, this method and apparatus can overcome some shortcomings of known technology by some average pulses are provided in whole period, reduce the needs as expensive objects such as Eprom simultaneously.
Brief summary of the invention
In view of the above, in first aspect, the present invention can extensively be called and comprise and a kind ofly drive the method for digital indicator by distribution pulse-width signal in whole period that this method comprises the following steps:
In time durations " T ", produce a plurality of pulse signals;
Each of described a plurality of pulse signals provides at least one individual pulses in this time durations " T ";
During in the discrete time interval in " T ", with respect to any other pulse in any signal in described a plurality of pulse signals, produce each pulse of described a plurality of pulse signals; And
Make up described pulse signal according to data, comprise the output signal of the pulse of distribution with generation, the pulse summation representative of described distribution is by " T " during the part-time of sending into data predicting.
In view of the above, in second aspect, the present invention can extensively be called and comprises a kind ofly at the device that drives digital indicator by distribution pulse-width signal in the whole period " T ", and this device comprises:
At least one signal generator produces a plurality of pulse signals, wherein, each described signal comprises the distribution of individual pulses, and, relative with the individual pulses of all pulse signals whole during in the discrete time interval in " T ", each described individual pulses is provided;
On behalf of this, the AND coupling arrangement the position of sending into data-signal and described a plurality of pulse signals combination, thereby send into data-signal so which to select in the described pulse signal should be combined; And
The OR coupling arrangement is combined into the distribution pulse of representing this single series of sending into data to described selected signal in time durations " T ".
In view of the above, in the third aspect, the present invention can extensively be called and comprises a kind ofly by producing the discrete pulse signal of a plurality of times that the is fit to subsequent combination method of display that driven number, and this method comprises the following steps:
Produce the continuous binary bit number of wishing the time durations segmentation;
The inferior sequence number of exporting of the level of the continuous binary digit purpose least significant bit (LSB) that identification is produced, the corresponding single time interval of each number, identification lowermost level time position; And
Produce an output pulse on one in a plurality of outputs capable of being combined, and contain the other one by one pulse that produces at the time interval of each segmentation and by the common lowermost level that in a common output, the produces time position pulse that recognizer produced.
In view of the above, in fourth aspect, the present invention can extensively be called and comprises a kind ofly by produce the device that a plurality of pulse signals capable of being combined drive digital indicator in whole period, and this device comprises:
Counter, the binary bit number that produces a sequence segments time durations;
Lowermost level time position recognizer, the least significant bit (LSB) of identification from the binary bit sequence of this counter output, and export a continuous signal of representing this least significant bit (LSB), such signal is corresponding with each described timing separation; And
Pulse generator activates each the unique lowermost level time pulse of position in a discrete output of being discerned, and activates the continuous impulse of the common lowermost level time position that will be created in the common output.
Description of drawings
Referring now to following accompanying drawing preferred embodiment of the present invention is described, wherein:
Fig. 1 demonstration is used to provide the prior art devices that is distributed in the pulse-width signal in whole period;
Fig. 2 demonstration is represented the memory body address according to the part of Eprom in the device shown in Figure 1;
Fig. 3 shows the synoptic diagram of preferred embodiment of the present invention;
Fig. 4 shows a plurality of pulse signals according to simplified embodiment of the present invention; And
Fig. 5 simplifies a kind of sketch plan that may export of form for expression the present invention.
Embodiment
The invention relates to a kind of method and apparatus that drives digital indicator by distribution width-modulation pulse in whole period.
In preferred versions, embodiment implements with the form of the display device screen of display digit data-signal 2.In order to describe purpose, display device screen can be represented by single LED element 1.Certainly in practicality, the present invention implements by a plurality of this LED element 1 that control is formed in the individual pixel.
Moreover, the invention is not restricted to as such as the LED element of plasm TV, LCD projector, LCD screen and the numerical data of other display systems such as similar installation that all run into identical intrinsic problem, and be used for the needs of in update cycle distribution pulse-width signal.
For briefly, a preferred embodiment that shows among Fig. 3 demonstrates the embodiment that drives single LED 1 with a pulse-width signal 6.
Please refer to Fig. 3, will describe this device with reference to the distribution pulse-width signal of independent 8 projects that representative data 2 is provided.Though be referred to 8 bit digital data this device is described, only because of 8 bit digital data suitable standard in industry.Can make a change and this change takes place really it.
In this embodiment, the invention provides the signal generator 7 of a plurality of pulse signals 8 of output.Each pulse signal 8 can be provided at the whole section multiple distribution of pulses in the time with the one or more combinations in other pulse signals 8.
As showing among Fig. 3, data 2 can be determined the mixing of signal of the correct representative data 2 of those needs with these other pulse signal 8 combinations.The pulse signal 6 of these accumulating forms offers LED 1 then.
Provide the signal generator 7 of a plurality of signals to manage to provide the signal that can make up easily, so that the multiple scope of the various gradients that need represent numerical data to be provided.Moreover, wish that signal can be combined, make and compare that pulse provides the time durations of the multiple number percent that is covered by pulse with time durations without any pulse.They are combined increases the amplitude of individual pulses.Therefore, a plurality of pulse signals 8 comprise such pulse signal ideally, and any individual pulses of any signal is compared with other signal pulses that can make up with it, and described pulse can cover discrete time interval.Any specified moment in this time interval, a pulse can only be provided by in a plurality of pulse signals 8.
The present invention manages to implement the present invention with a logical circuit, and described logical circuit is used for producing these pulses and as signal generator 7.Circuit in this preferred embodiment comprises clock 5, counter 4, priority encoder 9 and demoder 10.
If adopt the example that shows in the preferred embodiment of 8 bit digital data 2, then these data can comprise any 256 unique binary bit numbers representing decade number from 0 to 255.
Though not strict needs, this preferred embodiment utilize a clock 5 and one 8 digit counters 4, make the time durations " T " of coupling update cycle can be separated into a plurality of less time intervals.Use 8 digit counters 4 that " T " during update time is separated into 256 less time intervals, each less time interval is by the continuous binary bit output expression of counter 4.
It should be noted that similar to the known technology that Fig. 1 discusses, the number of the time interval that the update cycle is separated into need not to mate gradient number possible in the numerical data.Comprise that at this in numerical data example of 8 signals, this preferred versions is mated this data with one 8 digit counters 4, with complete process data and clear the explanation.Yet counter 4 can be greater number, for example, 10 digit counters of increase is arranged on the position for other purposes.
Perhaps, the less position signal of use as 6 signals is possibility also, though this will reduce possible combination and insufficient utilization can be from all gradients of 8 position digital signals acquisition.
Please refer to signal generator 7, will recognize that counter 4 produces 256 numerical value binary bit signals in time durations " T ".On counter 4, be appointed as Q 0To Q 7Each 8 carry-out bit be mapped to input position on the priority encoder 9.
It is inferior that priority encoder manages to determine to send into binary digit purpose level.Highest significant position in the general identification of priority encoder 8 bit patterns.
In order to produce a plurality of output signals 8 of hope, will be appreciated that better signal comprises that the signal of the pulse with each second of containing 256 time intervals, another signal, each the 8th time interval that each the 4th time interval has pulse have another signal of pulse or the like, and wherein pulse does not overlap each other.The active occurrence frequency in position of these pulsed frequencies and counter 4 is complementary.Pulse signal comprises having and is being roughly 1/2 nT and n=1,2,3 ... Deng during in pulse signal.It is inferior that maximum n will mate the binary bit level in All Time interval.In this example, 256 time intervals are 2 8, so sequence stops when n=8.
If consider to map directly to the counter 4 of priority encoder 9, will recognize that then the signal distributions that is relevant to highest significant position is distributed in the time deficiently.For example, carry-out bit Q 7Be the highest significant position of 50% time durations, be the highest significant position of half number of producing by counter 4.Yet, it is the highest significant position of last 50% number that produces, and consider this be produce at signal, may originating of will causing a pulse signal, though it is represented during the pot life of half, but concentrate in last 50% the time durations, and in not being distributed in during the All Time.
Contrast ground, the present invention recognizes that the distribution of pulses of not hope is to be produced by highest significant position, and produce by the least significant bit (LSB) from counter 4.
On 256 unique binary bit numbers that produce from counter 4, Q 0The position will be 256 least significant bit (LSB)s on the binary digit purpose per second.Contrast ground, carry-out bit Q 7It is the least significant bit (LSB) of binary bit number " 10000000 ".This just takes place separately.
Use the method, priority encoder 9 is connected to counter 4, does not discern highest significant position, but actual identification is from the least significant bit (LSB) of counter 4.By reversing the mapping of output between line and input position, make counter 4 to be a position Q 0Minimum carry-out bit be mapped to the highest input position I of priority encoder 9 7, just can accomplish.As shown in the line 11 that shows among Fig. 3.
Output from priority encoder 9 comprises 256 continuous binary bit numbers, and each all represents from 0 to 7 decimal number purpose 3 bits number of pointing out the highest significant position discerned for the input of priority encoder 9.3 bits number can be transferred to demoder 10 by line 12 continuously.
10 signal comprises generally with sequence along line 12 to demoder: 7,6,7,5,7,6,7,4,7 ... the number sequence of form.
Demoder 10 is attempted these 256 indivedual numbers are construed to 8 pulse signals.These by demoder from carry-out bit P 7To P 0Output.
When demoder 10 is represented the input signal of decade number 7 in reception, at output P 7Last output one pulse.Similarly, receiving an input of representing decade number 4 will be at output P 4Last generation one pulse or the like.
In the output of priority encoder 9, the occurrence frequency of decade number 7 all has generation for it at the per second of 256 discrete outputs.Therefore at output P 7On demoder 10 be output as the per second pulse of 256 indivedual time slices.
Simplification form in the output of possible embodiment shown in Fig. 4 and Fig. 5.
Please refer to Fig. 4, the representativeness output of 3 systems is shown.Use same procedure, will comprise that from the output of the demoder of 3 generators wherein per second pulse produces the pulse signal P of a pulse 2, wherein per the 4th time interval produces the signal P of a pulse 1And comprise the signal P of individual pulse 0These can as hope be combined and represent 8 discrete signals by number 0 to 7 expression.Note that number represents by getting rid of all pulses.
Please refer to Fig. 5, representation signal P is shown 2And P 0The accumulation output of combination.This provides five pulses that are distributed in time durations " T ".
In these embodiments, note that pulse is not the complete time durations " T " that is distributed in equably for all combinations.As showing among Fig. 5, five individual pulses are distributed as single pulse, three pulse body, and another single pulse.When working with numerical data, the pulse that during 8 discrete less time intervals of " T " during whole section, produces and imperfect even distribution, unless less time interval " T " but beginning and end point self asynchronization.
Though it is this causes the undesirable distribution on 3 signals, when bits number increases, less as the whole structure that the distribution of three continuous impulse combined sequence showing among Fig. 5 produces.
Please get back to 8 embodiment that show among Fig. 3, can see the setting by AND door 14, data 2 can be combined with each signal in a plurality of signals 8.
Data 2 comprise from 0 to 255 binary bit number.If adopt an example, number 128 is " 10000000 " with binary representation.As showing among Fig. 3, can provide data 2 by an impact damper or analog 15, and for example the signal output of number 128 will be at output Q 7One of last generation " 1 ".Other all outputs will be zero.
O from data 2 7Position and P from demoder 10 7Signal plus.As the aforementioned, P 7Signal is included in per second place 128 individual pulses regularly of less time interval.At O 7The appearance of " 1 " and its combination by the AND door cause P on the data bit 7The output 16 of signal.Remainder data position O 0To O 6All be zero, and they by the AND door respectively with P 0To P 6On signal combination will suppress all the other pulse signals from AND door 14 output.As a result, the output 6 that is fed to LED 1 is just from the P of demoder 10 7Output.
If being binary representations of numerical value 129, data 2 then can consider another example, on binary bit, and will be from the output of impact damper 15 at O 7Producing one " 1 " on the position reaches at O 0One " 1 " on the position.Therefore, from the AND passage downstream, from the P that has only of demoder 10 outputs 7And P 0Still exist, every other pulse signal is suppressed.This two signal makes up by OR door 17, makes output 6 comprise some 129 pulses.This is pulse signal P 7Additional pulse addition in the mid point that will produce one three continuous impulse in the middle of time durations obtains.This overcomes flash effect as described above near evenly distributing fully.
Therefore can see the invention provides and to produce the method and apparatus that the various energy levels that will be fed to display device 1 are represented in a series of pulses that are distributed in the time durations.Enforcement of the present invention need not to utilize the expensive Eprom of question blank or memory body address paragraph, but utilizes logical circuit.
Logical circuit utilizes the occurrence frequency of the lowermost level time position of counter to produce confession and send into the desired signal that the data subsequent combination is used.
Further aspect of the present invention can become clear to those people who knows this technology when reading description.The description relevant with preferred embodiment is not considered to limit the present invention, and a preferred embodiment and application of the present invention just are described.
The specific integer of mentioning in the entire chapter explanation can be replaced by functional equivalent when needed.

Claims (13)

1.一种通过在整段时间内分布脉宽调制信号来驱动数字显示器的方法，该方法包括下列步骤：1. A method of driving a digital display by distributing a pulse width modulated signal over a period of time, the method comprising the steps of: 用时钟驱动计数器产生指定期间“T”的细分的一序列二进位数目；Use the clock to drive the counter to generate a subdivided sequence of binary numbers for the specified period "T"; 反向连接所述时钟驱动计数器到优先级编码器，以接收所述时钟驱动计数器的最低有效位；inversely connecting the clock-driven counter to a priority encoder to receive the least significant bit of the clock-driven counter; 产生一序列信号，每个信号与各时间区间相对；generate a sequence of signals, each corresponding to a respective time interval; 识别最低有效位；identify the least significant bit; 用解码器在各唯一最低有效位的分立输出上产生输出脉冲，且在所识别的各共同最低有效位的相同输出上产生后续脉冲；using a decoder to generate an output pulse on a discrete output for each unique least significant bit and subsequent pulses on the same output for each identified common least significant bit; 在时间期间“T”内产生多个脉冲信号；generating a plurality of pulse signals within a time period "T"; 在该时间期间“T”内每个所述多个脉冲信号提供至少一个个别脉冲；each of said plurality of pulse signals provides at least one individual pulse during the time period "T"; 相对于在所述多个脉冲信号的任一个内的任何其他脉冲，所述多个脉冲信号的各脉冲在期间“T”内的分立时间区间中产生；及each pulse of said plurality of pulse signals is generated in a discrete time interval within period "T" relative to any other pulse within any one of said plurality of pulse signals; and 根据数据来组合所述脉冲信号，以产生包括分布脉冲的输出信号，所述分布脉冲的总和代表送入数据的时间期间“T”的部分。The pulse signals are combined according to the data to produce an output signal comprising distributed pulses whose sum represents the fraction of the time period "T" into which the data is fed. 2.根据权利要求1所述的方法，其中所述多个脉冲信号的数目等于需要来代表所述数据最高数目的二进位数字的数目。2. The method of claim 1, wherein the number of the plurality of pulse signals is equal to the number of binary digits required to represent the highest number of the data. 3.根据权利要求1所述的方法，其中所述多个脉冲信号包括含有在大致为时间期间“T”的1/2nT时间内的脉冲的信号，而n＝1，2，3，…，且最大的n等于期间“T”被细分成的分立时间区间的数目级次。3. The method according to claim 1 , wherein said plurality of pulse signals comprises signals comprising pulses within approximately 1/2 nT of time period "T", and n=1, 2, 3, ..., with a maximum n equal to the number of discrete time intervals into which period "T" is subdivided. 4.根据权利要求1所述的方法，其中把所述脉冲信号与数据进行组合包括：利用所述数据来选择所述脉冲信号，然后把选定信号组合成一个单一尝试信号。4. The method of claim 1, wherein combining the pulse signal with data comprises using the data to select the pulse signal and then combining the selected signal into a single try signal. 5.根据权利要求4所述的方法，其中把送入二进位数据值中的有效位与脉冲信号匹配以选择组合信号，而进行所述选择。5. The method of claim 4, wherein said selecting is performed by matching a valid bit fed into a binary data value with a pulse signal to select a combined signal. 6.一种通过在整段时间“T”内分布脉宽调制信号来驱动数字显示器的装置，该装置包括：6. An apparatus for driving a digital display by distributing a pulse width modulated signal over a period of time "T", the apparatus comprising: -至少一个信号产生器，来产生多个脉冲信号，其中每个所述信号包括个别脉冲分布，且在整个期间“T”内相对于所有脉冲信号的个别脉冲的分立时间期间中提供每个所述个别脉冲，所述至少一个信号产生器包括- at least one signal generator to generate a plurality of pulse signals, wherein each said signal comprises a distribution of individual pulses and provides each of the individual pulses in discrete time periods relative to the individual pulses of all pulse signals throughout the period "T" said individual pulses, said at least one signal generator comprising 时钟驱动计数器，用于产生指定期间“T”的细分的一序列二进位数目；A clock-driven counter for generating a subdivided sequence of binary numbers for a specified period "T"; 编码器，反向连接所述时钟驱动计数器，以接收所述时钟驱动计数器的最低有效位并产生一序列信号，每个信号与各时间区间相对，且识别最低有效位；以及an encoder coupled inversely to the clocked counter to receive the least significant bit of the clocked counter and generate a sequence of signals, each signal corresponding to a respective time interval and identifying the least significant bit; and 解码器，在各唯一最低有效位的分立输出上产生多个输出脉冲，且在所识别的各共同最低有效位的相同输出上产生后续脉冲；a decoder that produces multiple output pulses on separate outputs for each unique least significant bit and subsequent pulses on the same output for each identified common least significant bit; -AND连接装置，连接到所述解码器的输出，将送入数据信号的位与所述多个脉冲输出信号组合，以选择所述脉冲输出信号中哪一个应被组合来代表该送入数据信号；及- AND connection means, connected to the output of said decoder, combining bits of an incoming data signal with said plurality of pulse output signals to select which of said pulse output signals should be combined to represent the incoming data signal; and -OR连接装置，连接到所述AND连接装置，在时间期间“T”内把所述多个选定的输出信号组合成代表该送入数据的单一系列的分布脉冲。- OR connection means, connected to said AND connection means, for combining said plurality of selected output signals into a single series of distributed pulses representing the incoming data during a time period "T". 7.根据权利要求6所述的通过在整段时间“T”内分布脉宽调制信号来驱动数字显示器的装置，其中所述多个脉冲信号包括该送入数据信号的每个二进制位的脉冲输出信号。7. The apparatus for driving a digital display by distributing a pulse width modulated signal over a period of time "T" as recited in claim 6, wherein said plurality of pulse signals includes a pulse for each binary bit of the incoming data signal output signal. 8.根据权利要求6所述的通过在整段时间“T”内分布脉宽调制信号来驱动数字显示器的装置，其中所述多个脉冲信号包括含有在大致为时间期间“T”的1/2nT内的脉冲的信号，而n＝1，2，3，…，直到n等于整段期间“T”被细分成的分立时间区间数目的二进位级次为止。8. The apparatus for driving a digital display by distributing a pulse width modulated signal over a period of time "T" as recited in claim 6, wherein said plurality of pulse signals comprises 1/ A signal of pulses within 2 n T, where n = 1, 2, 3, . 9.一种通过产生适合来做后续组合的多个时间分立脉冲信号来驱动数字显示器的方法，该方法包括下列步骤：9. A method of driving a digital display by generating a plurality of time-discrete pulsed signals suitable for subsequent combining, the method comprising the steps of: 用时钟驱动计数器产生一段时间的细分的一序列二进位数目；Use the clock to drive the counter to generate a subdivided series of binary numbers for a period of time; 反向连接所述时钟驱动计数器到优先级编码器，以接收所述时钟驱动计数器的最低有效位；inversely connecting the clock-driven counter to a priority encoder to receive the least significant bit of the clock-driven counter; 产生一序列信号，每个信号与各时间区间相对；generate a sequence of signals, each corresponding to a respective time interval; 识别最低有效位；identify the least significant bit; 用解码器在各唯一最低有效位的分立输出上产生输出脉冲，且在所识别的各共同最低有效位的相同输出上产生后续脉冲；using a decoder to generate an output pulse on a discrete output for each unique least significant bit and subsequent pulses on the same output for each identified common least significant bit; -产生把希望时间期间细分的连续二进位数目；- Generate consecutive binary numbers subdividing the desired time period; -识别所产生的连续二进位数目的所述最低有效位的级次来输出一序列数目，每个所述序列数目与一个时间期间细分相对，且识别最低级次位；及- identifying the order of said least significant bits of consecutive binary numbers generated to output a sequence of numbers, each of said sequence numbers corresponding to a time period subdivision, and identifying the lowest order bit; and -在多个可组合输出中的一个上产生输出脉冲，且产生各个细分的时间区间的个别脉冲，而且在共同输出上产生由共同最低级次位识别器所产生的脉冲。- Generating output pulses on one of a plurality of combinable outputs, and generating individual pulses for each subdivided time interval, and generating the pulses generated by the common lowest-order bit identifier on a common output. 10.根据权利要求9所述的方法，其中所述输出脉冲在所识别的各唯一最低级次位的唯一输出上产生。10. The method of claim 9, wherein the output pulse is generated on a unique output of each unique lowest-order bit identified. 11.一种通过在整段时间内产生多个可组合脉冲信号来驱动数字显示器的装置，该装置包括：11. An apparatus for driving a digital display by generating a plurality of combinable pulse signals over a period of time, the apparatus comprising: -计数器，产生一序列二进位数目来把时间期间细分；- a counter that generates a sequence of binary numbers to subdivide the time period; -最低级次位识别器，识别在从该计数器输出的二进位序列中的最低有效位，且输出代表该最低有效位的连续信号，一个信号与一个所述时间细分相对；- a lowest-level sub-bit identifier, identifying the least significant bit in the binary sequence output from the counter, and outputting successive signals representing the least significant bit, a signal corresponding to one of said time subdivisions; -脉冲产生器，用于致动所识别的各唯一最低级次位的分立输出上的脉冲，及致动要在共同输出上产生的共同最低级次位的连续脉冲；- a pulse generator for actuating pulses on the discrete outputs for each unique lowest-order sub-position identified, and for actuating consecutive pulses for the common lowest-order sub-position to be generated on the common output; 优先级编码器，反向连接所述计数器，使得该编码器的最高级次输入被连接至该计数器的最低级次输出；a priority encoder connected inversely to said counter such that the highest order input of the encoder is connected to the lowest order output of the counter; 解码器；用来接收来自所述优先级编码器的信号。a decoder; used to receive the signal from the priority encoder. 12.根据权利要求11所述的装置，其中所述计数器被驱动来产生所述二进位数目序列，且利用时钟来把所述时间期间细分。12. The device of claim 11, wherein the counter is driven to generate the sequence of binary numbers and a clock is used to subdivide the time period. 13.根据权利要求11所述的装置，其中所述多个可组合脉冲信号包括n个信号，其中n代表来自所述计数器的时间区间数目的二进位数目级次。13. The apparatus of claim 11, wherein the plurality of combinable pulse signals comprises n signals, where n represents a binary number order of the number of time intervals from the counter.
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