CN102044211B - Scanning type display device control circuit - Google Patents
Scanning type display device control circuit Download PDFInfo
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- CN102044211B CN102044211B CN2009101790853A CN200910179085A CN102044211B CN 102044211 B CN102044211 B CN 102044211B CN 2009101790853 A CN2009101790853 A CN 2009101790853A CN 200910179085 A CN200910179085 A CN 200910179085A CN 102044211 B CN102044211 B CN 102044211B
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Abstract
The invention provides a scanning type display device control circuit which is suitable for receiving successive frame data and driving a light-emitting diode display device according to the successive frame data. The scanning type display device control circuit comprises a ping-pong storage area, a data storage controller, a row scanning controller, a buffer module and a scattered type pulse width modulation signal generating device. The scanning type display device control circuit can repeatedly and circularly utilize the frame data so as to avoid repeated transmission of mass data. Therefore, the bandwidth required for inputting the data can be greatly reduced. In addition, the scattered type pulse width modulation signal generating device can scatter a pulse width modulation signal with longer cycle into a plurality of scattered type pulse width modulation signal with a shorter cycle, thus refreshing frequency can be effectively improved under the condition of not altering the bandwidth of the input data.
Description
Technical field
The present invention is about a kind of circuit, particularly a kind of scanning type display device control circuit.
Background technology
In recent years, the manufacturing cost of light emitting diode (Light-Emitting Diode, LED) declined to a great extent.Therefore, light emitting diode indicator is used in various occasions widely, similarly is gymnasium, outdoor billboard etc.
Light emitting display device can use the light emitting diode of thousands of as the picture element that shows use usually.The picture element that presents respectively different brightness can consist of a picture (picture), and a plurality of pictures sequentially present in time can consist of dynamic image (dynamic image).
These picture elements are controlled via controller respectively.Controller is according to the data of input, transmits respectively the signal open or close to LED driving circuit (LED driver), and then controls the brightness of picture element.
Generally speaking, dynamic image is about and switches 60 pictures p.s., that is to say, the switching frequency (Frame Rate) of input picture is 60Hz.Because very of short duration of the cycle of image switching, human eye be when watching this dynamic image, can be due to the phenomenon of persistence of vision, and feel that this dynamic image is continuous.
In addition, the needed time of time of a complete picture of demonstration is called refresh time.The inverse of refresh time is refreshing frequency (refresh rate).When refreshing frequency was higher, (when for example using the photographic equipment high-speed shutter to take) occured in the situation that light emitting display device more is not easy flicker.
On the other hand, the quantity of the general needed LED driving circuit of light emitting display device is all very huge.In order to save the quantity of LED driving circuit, light emitting display device can adopt the controller of sweep type (scan-type).In the controller of sweep type, a plurality of light emitting diodes can be driven in different time points by a switchgear.Therefore, same LED driving circuit can drive a plurality of light emitting diodes.
Although the controller of sweep type can be saved the quantity of LED driving circuit, for same LED driving circuit, its data volume to be processed doubles.That is to say, this LED driving circuit needs larger transmitting bandwidth.In addition, because show that the needed time of the time of a complete picture is elongated, refreshing frequency (refresh rate) also can and then descend.
Summary of the invention
In view of above problem, the present invention proposes a kind of scanning type display device control circuit, in order to improving the refreshing frequency of scan type display device, and reduces the transmitting bandwidth of LED driving circuit.
The scanning type display device control circuit that the present invention proposes is suitable for and accepts continuous a plurality of picture datas and drive according to this a light emitting display device.Scanning type display device control circuit comprises table tennis storage area (Ping-pong buffer), data storing controller, line scanning controller, buffer module and breaks up formula pulse width modulation signal generation device.
The table tennis storage area comprises one first storage area and one second storage area.The data storing controller sequentially accept picture data and alternately the stored picture data in the first storage area or the second storage area.The line scanning controller logic is connected in the table tennis storage area, and the line scanning controller is in order to the data line among the first storage area or the second storage area acquisition picture data alternately.The buffer module logic is connected in the line scanning controller, in order to temporary row data.
Break up formula pulse width modulation signal (Scrambled Pulse Width Modulation) generation device logic and be connected in buffer module and line scanning controller.Break up formula pulse width modulation signal generation device acquisition row data and produce one according to the row data and break up formula pulse width modulation signal to drive light emitting display device.
In one embodiment of this invention, the row data are M position, when through all after dates of line feed, break up the formula pulse width modulation signal generation device generation another data line of acquisition and produce another according to another data line and break up formula pulse width modulation signal, wherein the line feed cycle is 2
NIndividual operation period, and N is less than M.
In another embodiment of the present invention, the row data are M position, when through all after dates of line feed, break up the formula pulse width modulation signal generation device generation another data line of acquisition and produce another according to another data line and break up formula pulse width modulation signal, wherein the line feed cycle is 2
NIndividual operation period adds one and disappears the shadow cycle, and N is less than M.
The another a kind of scanning type display device control circuit that proposes of the present invention is suitable for and accepts continuous a plurality of picture datas and drive according to this a light emitting display device.Scanning type display device control circuit comprises rattle storage area (Ping-pong buffer), data storing controller, line scanning controller and pulse width modulation signal generation device.Wherein, the line scanning controller is disappearing shadow after the time through a Cycle Length and corresponding to row data, and the line scanning controller captures the another data line of these picture datas, and another line number is reportedly delivered to the pulse width modulation signal generation device.
But scanning type display device control circuit repetitive cycling of the present invention utilize picture data, transmit to avoid a large amount of repeating.Therefore inputting the needed frequency range of data can significantly be lowered.In addition, break up formula pulse width modulation signal generation device and can be dispersed as the shorter formula of breaing up pulse width modulation signal of a plurality of cycles by the pulse width modulation signal that one-period is long, therefore can in the situation that do not change input data frequency range, effectively improve refreshing frequency.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the structural drawing of sweep type of the present invention (scan-type) light emitting display device;
Fig. 2 is the system block diagram of the first embodiment of the present invention;
Fig. 3 A and Fig. 3 B are the sequential chart of driving signal of the present invention;
Fig. 4 A is the system block diagram of breaing up the first embodiment of formula pulse width modulation signal of the present invention;
Fig. 4 B is the system block diagram of breaing up the second embodiment of formula pulse width modulation signal of the present invention;
Fig. 5 A, Fig. 5 B and Fig. 5 C are the function mode schematic diagram of Fig. 2 of the present invention;
Fig. 6 is the system block diagram of the second embodiment of the present invention.
Wherein, Reference numeral
10 scanning type display device control circuits
11 table tennis the storage area
12 first storage areas
14 second storage areas
20 data storing controllers
30 line scanning controllers
41 first counters
42 second counters
43 tandom number generators
50 buffer module
51 first sub-buffers
52 second sub-buffers
53 master cache devices
60 break up formula pulse width modulation signal generation device
60 ' pulse width modulation signal generation device
61 first comparers
62 second comparers
90 light emitting display devices
92 switchs
Embodiment
Below be described in detail detailed features of the present invention and advantage in embodiment, its content is enough to make any related art techniques person of haveing the knack of understand technology contents of the present invention and implement according to this, and content disclosed according to this instructions, claim and accompanying drawing, any related art techniques person of haveing the knack of can understand purpose and the advantage that the present invention is correlated with easily.Following embodiment further describes viewpoint of the present invention, but non-to limit anyways category of the present invention.
Please refer to Fig. 1, be the structural drawing of light emitting display device 90.Light emitting display device 90 is the display screen of delegation's sweep type.Light emitting display device 90 need be used in conjunction with a switch 92.For example, the light emitting diode on light emitting display device 90 can be divided into the first row light emitting diode, the second row light emitting diode, the third line light emitting diode ... with the 8th row light emitting diode.Switch 92 circularly (circularly) sequentially conducting the first row light emitting diode, the second row light emitting diode, the third line light emitting diode ... with the 8th row light emitting diode.
When switch 92 conducting the first row light emitting diode, scanning type display device control circuit 10 can the corresponding driving signal of output the first row light emitting diode.Other every delegation light emitting diode equally by that analogy.
Please refer to Fig. 2, be the system block diagram of the first embodiment of the present invention.Scanning type display device control circuit 10 comprises table tennis storage area 11, data storing controller 20, line scanning controller 30, buffer module 50 and breaks up formula pulse width modulation signal generation device 60.
Table tennis storage area 11 comprises the first storage area 12 and the second storage area 14.Table tennis storage area 11 can write data and read without interruption.Data storing controller 20 is in order to sequentially to accept picture data, and data storing controller 20 also alternately is stored in the first storage area 12 or the second storage area 14 with these data.
Break up formula pulse width modulation signal generation device 60 logics and be connected in line scanning controller 30 and buffer module 50.Break up formula pulse width modulation signal generation device 60 and break up formula pulse width modulation signal in order to capture capable data and to produce one according to the row data.
Detailed method of operation of the present invention hereby is described as follows.
In this embodiment, picture data is grey menu data.That is to say, what in picture data, stored information represented is the GTG brightness of this picture.The numerical value of GTG brightness can represent the shading value of any color.The numerical value of GTG brightness is larger, and representative color is brighter.Opposite, the numerical value of GTG brightness is less, and representative color is darker.Take the black and white GTG brightness of sixteen bit as example.GTG brightness " 65535 " what represent is white, and GTG brightness " 0 " what represent is black.
At first, data storing controller 20 the second picture data (frame 2) that the first picture data (frame 1) of first image time (frame period) is stored in the first storage area 12, second image time three-picture data (frame 3) of being stored in the second storage area 14, the 3rd image time the 4th picture data (frame 4) of being stored in the first storage area 12, the 4th image time is stored in the second storage area 14.According to this order, picture data constantly is stored into the first storage area 12 or the second storage area 14.
When second image time, except the second picture data is written into the second storage area 14, and the first picture data also can be read from the first storage area 12 simultaneously.When the 3rd image time, except the three-picture data are written into the first storage area 12, and the second picture data also can be read from the second storage area 14 simultaneously.Because the step that writes and read that replaces continuously, the storage area 11 of rattling can't produce the interval time of pause between reading and writing.
In same image time, the data line of the acquisition picture data that line scanning controller 30 sequentially circulates, and the capable data that will capture are delivered to buffer module 50.Because the processing mode of each picture data is all identical, therefore only hereby describe with the first picture data at this.For example, comprise eight capable data (the first row data, the second row data, the third line data ... with the 8th row data) in the first picture.The order of line scanning controller 30 acquisition row data is the first row data, the second row data, the third line data ... with the 8th row data.After having captured the 8th row data, and then line scanning controller 30 can capture the first row data again.So sequentially circulation, line scanning controller 30 constantly captures and is sent to buffer module 50 with each the row data in a picture data.
Break up formula pulse width modulation (Scrambled Pulse Width Modulation, SPWM) signal generation device 60 can be dispersed as the shorter formula of breaing up pulse width modulation signal of a plurality of cycles by pulse width modulation (Pulse Width Modulation, the PWM) signal that one-period is long.Take the black and white GTG brightness of sixteen bit as example, in each row data, stored data length is sixteen bit.The cycle of the corresponding pulse width modulation signal of row data is 65,536 (2
16) individual operation period (cycle).The pulse width modulation signal of breaing up formula pulse width modulation signal generation device 60 and can be with length 65,536 operation periods is dispersed as a plurality of (such as 64) and breaks up formula pulse width modulation signal.That is to say, each length of breaing up formula pulse width modulation signal is 1,024 (2
10) individual operation period.
In this, operation period may be defined as the time between a frenquency signal rising edge (rising edge) to adjacent another rising edge (rising edge), also may be defined as the time between a frenquency signal drop edge (fallingedge) to adjacent another drop edge (falling edge).
Breaing up formula pulse width modulation signal generation device 60 can break up formula pulse width modulation signal with this and be sent to light emitting display device 90.At interval of a line feed cycle, the action that line scanning controller 30 can enter a new line and scan.For example, line scanning controller 30 acquisition the first row data, and the first row data are delivered to broken up formula pulse width modulation signal generation device 60 output driving signals.After a line feed cycle (1,024 operation period), line scanning controller 30 acquisition the second son row data, and the second row data are delivered to broken up formula pulse width modulation signal generation device 60 output driving signals.Constantly repeat this step, line scanning controller 30 sequentially captures the first row data, the second row data ... the 8th row data.After having captured the 8th row data, line scanning controller 30 can capture the first row data again again.
Please refer to Fig. 3 A.Fig. 3 A is for driving the sequential chart of signal.At first line feed cycle (1024 operation periods), the first row data can be transferred into breaks up formula pulse width modulation signal generation device 60 and breaks up formula pulse width modulation signal with generation.Second line feed cycle, namely during ensuing 1024 operation periods, the second row data can be transferred into breaks up formula pulse width modulation signal generation device 60 and breaks up formula pulse width modulation signal with generation.Repeat above-mentioned action, the first son row data, the second son row data ... sequentially be transferred into the 8th son row data and break up formula pulse width modulation signal generation device 60 and break up formula pulse width modulation signal with generation.
After eight line feed cycles, a picture data can be by complete demonstration.The T.T. in eight sub-signal cycles is referred to as subcycle.In this embodiment, the length of the first subcycle is 8,192 (8 * 1,024) individual operation period.Compared to general method, show that a complete picture needs 524,288 (8 * 65,536) individual operation period.Scanning type display device control circuit 10 of the present invention shows that a needed time of complete picture is only 1/64th of conventional method, that is to say, the refreshing frequency of scanning type display device control circuit 10 is 64 times of conventional method.
Be expert in the light emitting display device 90 of scan-type, in order to prevent the appearance of ghost phenomenon, after having transmitted driving signal corresponding to data line, can suspend a period of time, then transmitting driving signal corresponding to another data line.Shadow cycle that is referred to as to disappear time of this time-out.
Please refer to Fig. 3 B figure.Fig. 3 B is for driving the sequential chart of signal.In front during 1024 operation periods, the first row data can be transferred into breaks up formula pulse width modulation signal generation device 60 and breaks up formula pulse width modulation signal with generation.Afterwards, when the 1025th cycle, this scanning type display device control circuit 10 can temporarily stop producing the driving signal.The length in the 1025th cycle, the length in the shadow cycle that namely disappears.
In one embodiment of this invention, line scanning controller 30 has a foreign frequency signal input end mouth.Foreign frequency signal input end mouth is in order to input a foreign frequency signal.The foreign frequency signal is comprised of a plurality of sub-frenquency signal, corresponding operation period of the cycle of every sub-frenquency signal.That is to say, can be by the length that changes the foreign frequency signal, and then change the length in the shadow cycle that disappears.
Breaing up formula pulse width modulation signal generation device 60 can have the embodiment more than two kinds to reach at least, now is described as follows.
Fig. 4 A is the system block diagram of breaing up the first embodiment of formula pulse width modulation signal generation device 60.Break up formula pulse width modulation signal generation device 60 and comprise the first counter 41, the first comparer 61, the second counter 42 and the second comparer 62.
The first counter 41 is in order to export one first numerical value signal.The first numerical value signal is preferably and increases progressively signal.The first comparer 61 has a first input end and one second input end.First input end is in order to a front N highest significant position (Most Significant Bits, MSB) of line of input data, and the second input end is in order to input the first numerical value signal.The first comparer is according to first input end and the main signal of the second input end output.For example, when the numerical value of first input end during greater than the numerical value of the second input end, the first comparer 61 outputs " logical one " signal, when the numerical value of first input end equals numerical value less than the second input end, the first comparer 61 outputs " logical zero " signal.Light emitting diode only when " logical one " when signal is sent to light emitting diode, namely go the numerical value of a front N highest significant position of data during greater than the numerical value of the first counter 41, light emitting diode can emit beam.
The second counter 42 is in order to export a second value signal.The second comparer 62 has one the 3rd input end and four-input terminal.The 3rd input end is in order to a back L least significant bit (LSB) (LeastSignificant Bits, LSB) of line of input data, and four-input terminal is in order to input the second value signal.The second comparer 62 is according to the 3rd input end and four-input terminal output one compensating signature.For example, when the numerical value of the 3rd input end during greater than the numerical value of four-input terminal, the second comparer 62 outputs " logical one " signal, when the numerical value of the 3rd input end during less than the numerical value of four-input terminal, the second comparer 62 outputs " logical zero " signal.Wherein, the second value signal just can change its output numerical value every a subcycle.Therefore simultaneously can record each row and break up formula pulse width modulation signal output cycle breakpoint, and when scanning with delegation next time, continue and break up the output of formula pulse width modulation signal by breaing up formula pulse width modulation signal output cycle breakpoint last time.So as to can intactly completing the pulse width modulation output cycle, be not subjected to line scanning to interrupt affecting.This second counter 42 can adopt counting mode in proper order.Also can adopt even hop count mode.It is more even that evenly the hop count mode can make the formula of the breaing up pulse width modulation signal output after breaing up.
The formula of the breaing up pulse width modulation signal of breaing up 60 outputs of formula pulse width modulation signal generation device comprises the main signal of output and the second comparer 62 output compensating signature values of the first comparer 61.That is to say, break up formula pulse width modulation signal and can be distinguished into first paragraph and second segment in time, the signal of first paragraph is main signal, and the signal of second segment is compensating signature.
With the capable data instance of sixteen bit, suppose that the decimal system numerical value of this journey data is " 6405 ".The decimal system numerical value of ten the highest significant position representatives in front of this journey data is " 100 ", and the decimal system numerical value of six the least significant bit (LSB) representatives in back of row data is " 5 ".This journey data can be dispersed as 64 and break up formula pulse width modulation signal, and each length of breaing up formula pulse width modulation signal is 1024 operation periods.Because the decimal system numerical value of six the least significant bit (LSB) representatives in back of row data is " 5 ", so in these 64 are broken up formula pulse width modulation signal, wherein five compensating signatures of breaing up formula pulse width modulation signal are " 1 ", the compensating signature that other five nineteen is broken up formula pulse width modulation signal is " and 0 ".That is to say have five work periods (Duty Cycle) of breaing up formula pulse width modulation signal to be
, the work period (Duty Cycle) that other five nineteen is broken up formula pulse width modulation signal is
In order to reduce its low-frequency component and visual flicker, the second counter 42 can adopt even hop count mode, so that above-mentioned five work periods (Duty Cycle) are
The formula of breaing up pulse width modulation signal be uniformly distributed in 64 and break up in formula pulse width modulation signal.This implementation method can be with reference to TaiWan, China number of patent application 200729133.
Fig. 4 B is the system block diagram of breaing up the second embodiment of formula pulse width modulation signal generation device 60.Break up formula pulse width modulation signal generation device 60 and comprise tandom number generator 43 and the first comparer 61.Tandom number generator 43 produces random number numerical value signal.The first comparer 61 has first input end and the second input end.First input end is in order to the line of input data, and the second input end is in order to input random number numerical value signal.When the numerical value of first input end during greater than the numerical value of the second input end, the first comparer 61 output one first signals, when the numerical value of first input end equals numerical value less than the second input end, the first comparer output one second signal.For example, the first signal is " logical one " signal, and the second signal is " logical zero " signal.Light emitting diode only when " logical one " when signal was sent to light emitting diode, when the numerical value of data of namely going produced random number numerical value signal greater than tandom number generator 43, light emitting diode can emit beam.
At two kinds of above-mentioned embodiments, its line feed cycle is what equate.The action of line feed can be carried out by line scanning controller 30.
Produce the flow process of pulse width modulation signal for further description, please refer to Fig. 5 A, Fig. 5 B and Fig. 5 C.Fig. 5 A, Fig. 5 B and Fig. 5 C are according to the function mode schematic diagram of Fig. 2.
Please refer to Fig. 5 A.The first son row data are stored in master cache device 53, and the second son row data are stored in the first sub-buffer 51.Break up the numerical value of formula pulse width modulation signal generation device 60 acquisition master cache devices 53 this moment and produce and break up formula pulse width modulation signal.
Please refer to Fig. 5 B, when through all after dates of line feed, originally the second row data in the first sub-buffer 51 in Fig. 5 A are transferred into master cache device 53, and line scanning controller 30 transmits the sub-buffers 51 of the third line data to the first.
When scanning type display device control circuit 10 has sequentially been exported the first row data, the second row data ... after the formula of the breaing up pulse width modulation signal of the 8th row data, in the next time cycle, scanning type display device control circuit 10 can be exported the formula of the breaing up pulse width modulation signal of the first row data again.The capable data of the same picture data of intercepting that so constantly repeats, scanning type display device control circuit 10 can avoid a large amount of repeating to transmit picture data.Therefore inputting the needed frequency range of data can significantly be lowered.
In addition, line scanning controller 30 has an instruction input port (not shown), when instruction input port (not shown) received a Picture switch instruction, the data of master cache device 53 acquisitions became from the first sub-buffer 51 for becoming from the second sub-buffer 52 or from the second sub-buffer 52 from the first sub-buffer 51.Please refer to Fig. 5 C.Son row data in the second sub-buffer 52 can be transferred into master cache device 53, that is to say from the function mode of Fig. 5 A, are transformed into the function mode of Fig. 5 C.
By the structure of two buffers (the first sub-buffer 51 and the second sub-buffer 52) and the mechanism that pre-deposits data, scanning type display device control circuit 10 can transmit the corresponding driving signal of picture data incessantly continuously.
In one embodiment of this invention, if when in data line, a plurality of numerical value being arranged, the driving signal that a plurality of numerical value are corresponding can be parallel (Parallel) output.This scanning type display device control circuit 10 comprises a plurality of buffer module 50 and a plurality of formula pulse width modulation signal generation device 60 of breaing up.
Please refer to Fig. 6, be the system block diagram of the second embodiment of the present invention.Scanning type display device control circuit 10 comprises rattle storage area 11, data storing controller 20, line scanning controller 30, buffer module 50 and pulse width modulation signal generation device 60 '.Pulse width modulation signal generation device 60 ' can be general pulse width modulation signal generation device, also can be to break up formula pulse width modulation signal generation device 60.The function mode of this scanning type display device control circuit 10 is close with the first embodiment, therefore repeats no more.
Comprehensive the above, but scanning type display device control circuit repetitive cycling of the present invention utilize picture data, transmit to avoid a large amount of repeating.Therefore inputting the needed frequency range of data can significantly be lowered.In addition, break up formula pulse width modulation signal generation device and can be dispersed as the shorter formula of breaing up pulse width modulation signal of a plurality of cycles by the pulse width modulation signal that one-period is long, therefore can in the situation that do not change input data frequency range, effectively improve refreshing frequency.
Certainly; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (15)
1. a scanning type display device control circuit, be suitable for and accept continuous a plurality of picture datas and drive according to this a light emitting display device, it is characterized in that, this scanning type display device control circuit comprises:
One table tennis storage area, this table tennis storage area comprises one first storage area and one second storage area;
One data storing controller is sequentially accepted those picture datas and alternately stores those picture datas in this first storage area or this second storage area;
Delegation's scanning monitor, logic are connected in this table tennis storage area, capture a plurality of row data among those picture datas in order to this first storage area or this second storage area certainly;
One buffer module, logic are connected in this line scanning controller, in order to temporary those row data; And
One breaks up formula pulse width modulation signal generation device, logic is connected in this buffer module and this line scanning controller, and this is broken up formula pulse width modulation signal generation device and captures the data line in those row data and break up formula pulse width modulation signal to drive this light emitting display device according to the row data generation one of acquisition.
2. scanning type display device control circuit as claimed in claim 1, it is characterized in that, the row data of acquisition are M position, when through one the line feed all after dates, this is broken up the formula pulse width modulation signal generation device another data line of acquisition and produces another according to another data line and breaks up formula pulse width modulation signal, should be wherein 2 in the line feed cycle
NIndividual operation period, and N is less than M.
3. scanning type display device control circuit as claimed in claim 2, is characterized in that, this is broken up formula pulse width modulation signal and comprises main signal and a compensating signature, and this is broken up formula pulse width modulation signal generation device and comprises:
One first counter is in order to export one first numerical value signal;
One first comparer, have a first input end and one second input end, this first input end is in order to a front N highest significant position of the row data of input acquisition, this second input end is in order to input this first numerical value signal, and this first comparer is according to a front N highest significant position of the row data of the acquisition of this first input end input and this this main signal of the first numerical value signal output of this second input end input;
One second counter, in order to export a second value signal, this second value signal just can change its output numerical value every a subcycle; And
One second comparer, have one the 3rd input end and a four-input terminal, the 3rd input end is in order to a back L least significant bit (LSB) of the row data of input acquisition, this four-input terminal is in order to input this second value signal, and this second comparer is exported this compensating signature according to a back L least significant bit (LSB) of the row data of the acquisition of the 3rd input end input and this second value signal of this four-input terminal input.
4. scanning type display device control circuit as claimed in claim 2, is characterized in that, this is broken up formula pulse width modulation signal generation device and comprises:
One tandom number generator is in order to export a random number numerical value signal; And
One first comparer, have a first input end and one second input end, this first input end is in order to the row data of input acquisition, this second input end is in order to input this random number numerical value signal, and this first comparer is according to the row data of the acquisition of this first input end input and this random number numerical value signal output one main signal of this second input end input.
5. scanning type display device control circuit as claimed in claim 1, it is characterized in that, the row data of acquisition are M position, when through one the line feed all after dates, this is broken up the formula pulse width modulation signal generation device another data line of acquisition and produces another according to another data line and breaks up formula pulse width modulation signal, should be wherein 2 in the line feed cycle
NIndividual operation period adds one and disappears the shadow cycle, and N is less than M.
6. scanning type display device control circuit as claimed in claim 5, it is characterized in that, this line scanning controller has a foreign frequency signal input end mouth, and in order to input a foreign frequency signal, the cycle of this foreign frequency signal is in order to control this operation period and the length in this shadow cycle that disappears.
7. scanning type display device control circuit as claimed in claim 1, is characterized in that, this buffer module comprises:
One first sub-buffer, logic connect this line scanning controller, in order to the data line of temporary this first storage area;
One second sub-buffer, logic connect this line scanning controller, in order to the data line of temporary this second storage area; And
One master cache device, in order to capture the row data of this first sub-buffer or this second sub-buffer, this master cache device logic is connected in this and breaks up formula pulse width modulation signal generation device.
8. scanning type display device control circuit as claimed in claim 7, it is characterized in that, this line scanning controller has an instruction input port, when this instruction input port receives a Picture switch instruction, the data of this master cache device acquisition for become from this first sub-buffer capture from this second sub-buffer or become from this second sub-buffer and capture from this first sub-buffer.
9. a scanning type display device control circuit, be suitable for and accept continuous a plurality of picture datas and drive according to this a light emitting display device, it is characterized in that, this scanning type display device control circuit comprises:
One table tennis storage area, this table tennis storage area comprises one first storage area and one second storage area;
One data storing controller is sequentially accepted those picture datas and alternately stores those picture datas in this first storage area or this second storage area;
Delegation's scanning monitor, logic are connected in this table tennis storage area, in order to a plurality of row data among this first storage area or this second storage area capture those picture datas alternately;
One buffer module, logic are connected in this line scanning controller, in order to temporary those row data; And
One pulse width modulation signal generation device, logic is connected in this buffer module and this line scanning controller, and this pulse width modulation signal generation device captures the data line in those row data and produces a pulse width modulation signal according to the row data that capture;
Wherein the row data of acquisition are M position, and when through all after dates of line feed, this pulse width modulation signal generation device produces the another data line of acquisition and produces another pulse width modulation signal according to another data line;
Should it be wherein 2 in the line feed cycle
NIndividual operation period adds one and disappears the shadow cycle, and N is less than M.
10. scanning type display device control circuit as claimed in claim 9, is characterized in that, the length in this shadow cycle that disappears is controlled by a foreign frequency signal.
11. scanning type display device control circuit as claimed in claim 9, it is characterized in that, this pulse width modulation signal generation device is to break up formula pulse width modulation signal generation device, and this is broken up formula pulse width modulation signal generation device and breaks up formula pulse width modulation signal in order to produce one.
12. scanning type display device control circuit as claimed in claim 11 is characterized in that, this is broken up formula pulse width modulation signal and comprises main signal and a compensating signature, and this is broken up formula pulse width modulation signal generation device and comprises:
One first counter is in order to export one first numerical value signal;
One first comparer, have a first input end and one second input end, this first input end is in order to a front N highest significant position of the row data of input acquisition, this second input end is in order to input this first numerical value signal, and this first comparer is according to a front N highest significant position of the row data of the acquisition of this first input end input and this this main signal of the first numerical value signal output of this second input end input;
One second counter is in order to export a second value signal; And
One second comparer, have one the 3rd input end and a four-input terminal, the 3rd input end is in order to a back L least significant bit (LSB) of the row data of input acquisition, this four-input terminal is in order to input this second value signal, and this second comparer is exported this compensating signature according to a back L least significant bit (LSB) of the row data of the acquisition of the 3rd input end input and this second value signal of this four-input terminal input.
13. scanning type display device control circuit as claimed in claim 11 is characterized in that, this is broken up formula pulse width modulation signal generation device and comprises:
One tandom number generator is in order to export a random number numerical value signal; And
One first comparer, have a first input end and one second input end, this first input end is in order to the row data of input acquisition, this second input end is in order to input this random number numerical value signal, and this first comparer is according to the row data of the acquisition of this first input end input and this random number numerical value signal output one main signal of this second input end input.
14. scanning type display device control circuit as claimed in claim 11 is characterized in that, this buffer module comprises:
One first sub-buffer, logic connect this line scanning controller, in order to the data line of temporary this first storage area;
One second sub-buffer, logic connect this line scanning controller, in order to the data line of temporary this second storage area; And
One master cache device, in order to capture the row data of this first sub-buffer or this second sub-buffer, this master cache device logic is connected in this and breaks up formula pulse width modulation signal generation device.
15. scanning type display device control circuit as claimed in claim 14, it is characterized in that, this line scanning controller has an instruction input port, when this instruction input port receives a Picture switch instruction, the data of this master cache device acquisition for become from this first sub-buffer capture from this second sub-buffer or become from this second sub-buffer and capture from this first sub-buffer.
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| CN2009101790853A CN102044211B (en) | 2009-10-12 | 2009-10-12 | Scanning type display device control circuit |
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| CN103036540B (en) * | 2011-09-30 | 2015-05-20 | 北大方正集团有限公司 | Pulse width modulation (PWM) method and device for power control |
| CN103000123A (en) * | 2012-08-29 | 2013-03-27 | 北京集创北方科技有限公司 | Pulse width regulating device |
| CN103065598B (en) * | 2012-12-31 | 2014-12-17 | 东南大学 | Control method for preventing liquid crystal display from being blurred |
| CN106157892B (en) * | 2016-08-31 | 2019-01-01 | 深圳市华星光电技术有限公司 | A kind of OLED-PWM driving method |
| CN109192133B (en) * | 2018-10-31 | 2020-06-05 | 中国电子科技集团公司第五十八研究所 | Optimization method based on SPWM |
| CN111210778A (en) * | 2018-11-22 | 2020-05-29 | 海信视像科技股份有限公司 | Method and device for modulating backlight source driving signal |
| CN111445843B (en) * | 2019-01-17 | 2021-05-04 | 米彩股份有限公司 | Display driving module and driving method |
| US11138934B2 (en) * | 2019-07-30 | 2021-10-05 | Innolux Corporation | Display device |
| WO2023206277A1 (en) * | 2022-04-28 | 2023-11-02 | 京东方科技集团股份有限公司 | Circuit assembly, electronic device and driving method |
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| WO2002103667A1 (en) * | 2001-06-13 | 2002-12-27 | Kawasaki Microelectronics, Inc. | Simple matrix liquid crystal drive method and apparatus |
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