CN101989397A - Method for increasing refresh rate of LED (Light Emitting Diode) display screen - Google Patents
Method for increasing refresh rate of LED (Light Emitting Diode) display screen Download PDFInfo
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- CN101989397A CN101989397A CN2009101628089A CN200910162808A CN101989397A CN 101989397 A CN101989397 A CN 101989397A CN 2009101628089 A CN2009101628089 A CN 2009101628089A CN 200910162808 A CN200910162808 A CN 200910162808A CN 101989397 A CN101989397 A CN 101989397A
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Abstract
The invention discloses a method for increasing the refresh rate of an LED (Light Emitting Diode) display screen. The method comprises the following steps of: setting the corresponding weighting coefficient according to the lighting time length of each data bit, wherein data bits include at least two data bits, the weighting coefficient of which is less than 1; and carrying out combined lighting of the data bits, the weighting coefficient of which is less than 1, and the data bits, the weighting coefficient of which is not less than 1. By regulating the lighting order of each data bit of video data and moving the occurrence position of OE (Output Enable) signals in a period, the invention greatly increases the width of the OE signals during effective time, very smartly reduces the requirement of a driving chip to the effective time of the OE signals and achieves the purpose of obtaining higher refresh rate by using the LED display screen of the same driving chip.
Description
Technical field
The invention belongs to LED (Light Emitting Diode, light emitting diode) video display control technology field, particularly a kind of method that increases the LED display refreshing frequency.
Background technology
General LED control system comprises transmitter, divider and scanning three parts.Vision signal is sent to divider by transmitter, and divider sends to each scanning board respectively with data again.Scanning board is delivered to each LED lamp by enable signal (OE signal), latch signal (Latch signal) and the clock signal (CLK signal) of controlling and driving chip with video data, makes it show corresponding video image.Data between scanning board and the chip for driving transmit referring to Fig. 1.
The refreshing frequency of LED large screen display video image is high more, and the image effect that human eye is seen is just good more.Not only image does not have the sensation of flicker, and the image that video camera is taken can not glimmer yet.But the refreshing frequency of LED large screen display video image can not unrestrictedly improve.Because chip for driving is subjected to the restriction of the minimum effective width of its OE signal,, become a technical matters that is difficult to overcome so that the refreshing frequency of LED giant-screen video image can not be accomplished is very high.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of method that increases the LED display refreshing frequency, and this method can make and adopt the LED display of same chip for driving to reach higher refreshing frequency.
For solving the problems of the technologies described above, the method for the increase LED display refreshing frequency that the present invention proposes is as follows:
The duration of lighting according to each data bit is set corresponding weighting coefficient, and wherein weighting coefficient has two at least less than 1 data bit number; Weighting coefficient made up more than or equal to 1 data bit less than 1 data bit and weighting coefficient light.
As a kind of improvement project, in said method, when weighting coefficient less than 1 data bit number greater than weighting coefficient during more than or equal to 1 data bit number, with weighting coefficient greater than 1 split, make weighting coefficient be no less than weighting coefficient less than 1 number, will light with making up less than 1 weighting coefficient position again more than or equal to 1 weighting coefficient position more than or equal to 1 number.
As a kind of improvement project, in said method, by its length series arrangement of lighting duration, establishing data bit is 2n with each data bit, and the weighting coefficient of n position or n ± 1 bit data position is made as 1.
As a kind of improvement project, in said method, each data bit is arranged by the size order of its weighting coefficient, light by the combined order of head and the tail again.
The present invention is by adjusting the order of lighting of each data bit of video data, the appearance position of mobile OE signal in one-period, greatly increased the width of OE signal effective time, reduce chip for driving very dexterously to the requirement of the effective time of OE signal, thereby reached the purpose that makes the LED display that adopts same chip for driving obtain higher refreshing frequency.
Description of drawings
Data between Fig. 1 scanning board and the chip for driving transmit synoptic diagram;
Sequential relationship synoptic diagram between Fig. 2 OE signal of the present invention and data transmit.
Embodiment
Reach technological means and the effect that predetermined purpose is taked for further setting forth the present invention, below in conjunction with drawings and Examples, the method for the increase LED display refreshing frequency that the present invention is proposed is described in detail as follows.
Logical relation between chip for driving input signal and the output data has been described among Fig. 1.FPGA drives shift clock the Clk signal is sent in the chip for driving, and video data is sent in the chip for driving by the SIN signal wire, all video data positions make the Latch signal send a pulse signal after transmitting, and data are latched on the chip for driving, the light on and off of control LED lamp.Simultaneously, FPGA is according to the width of the weighted value control OE signal that is sent to the chip for driving data, promptly corresponding different gray scale.
Embodiment one
Suppose that the video data position is 8, grey level is 256 grades, adopts timesharing by turn to light, and promptly extracts the one digit number certificate successively from a byte data, divide and light corresponding pixel for 8 times, the time of lighting each time of each correspondence is different with the dutycycle of turn-off time.If the time of lighting increases progressively from the low level to a high position successively, then the He Cheng time of lighting will have 256 kinds of combinations.The definition time of lighting adds that the turn-off time is a chronomere, is made as T.The minimum weight coefficient of data bit is made as 1/8, then the weighting coefficient of 0bit, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit data bit is respectively 1/8,1/4,1/2,1,2,4,8,16, and promptly the time of lighting of 0bit, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit is respectively T/8, T/4, T/2, T, 2T, 4T, 8T, 16T.Certainly, this brightness is temporal cumulative effects.Fig. 2 has illustrated the logical relation between OE signal of the present invention and the transmission data bit.As can be seen, in order to increase the pulse width of OE signal, when transmitting data bit, do not transmit each data bit in order.The order that present embodiment adopts head and the tail to combine is lighted each data bit, and promptly order is lighted 0bit, 7bit, 1bit, 6bit, 2bit, 5bit, 3bit and 4bit data bit.Certainly, also have the multiple sequential combination mode of lighting, light 0bit, 6bit, 1bit, 5bit, 2bit, 7bit, 4bit and 3bit data bit etc. as order according to thinking of the present invention.
0 constantly, the Latch signal sends pulse signal, with the data latching of 0bit position in chip for driving, under the effective situation of OE signal high level, if the OE signal is a high level, then chip for driving is exported the data of 0bit position, if the OE signal is a low level, then the chip for driving output pin is a high-impedance state.Because the weighting coefficient of the corresponding OE signal in 0bit position is 1/8, so in 0～7T/8 corresponding low level of OE signal in the time.At 7T/8 constantly, the OE signal becomes high level, 7T/8 to T in the time OE keep high level, then be (T-7T/8)=T/8 the effective time for 0bit position OE signal, the weighted value of satisfied 0bit position.At T constantly, the Latch signal sends pulse signal, with the data latching of 7bit position in chip for driving, under the effective situation of OE signal high level, if the OE signal is a high level, then chip for driving is exported the data of 7bit position, if the OE signal is a low level, then the chip for driving output pin is a high-impedance state.Because the weighting coefficient of 7bit bit data is 16, thus T to 17T in the time OE signal remain effective high level.Like this, OE signal in the change procedure of 7bit position is always high level in the 0bit position, and the time of maintenance high level is (T/8+16T)=129T/8.
At 17T constantly, the Latch signal sends pulse signal, with the data latching of 1bit position in chip for driving, under the effective situation of OE signal high level, if the OE signal is a high level, then chip for driving is exported the data of 1bit position, if the OE signal is a low level, the chip for driving output pin is a high-impedance state.Because the weighting coefficient of the corresponding OE signal in 1bit position is 1/4, thus at 17T to (17T+3T/4) the OE signal correspondence low level time in.At (17T+3T/4) constantly, the OE signal becomes high level, (17T+3T/4) to 18T the time in the OE signal keep high level, then be (18T-(17T+3T/4))=T/4 the effective time for 1bit position OE signal, the weighted value of satisfied 1bit position.At 18T constantly, the Latch signal sends pulse signal, with the data latching of 6bit position in chip for driving, under the effective situation of OE signal high level, if the OE signal is a high level, then chip for driving is exported the data of 6bit position, if the OE signal is a low level, then the chip for driving output pin is a high-impedance state.Because the weighting coefficient of 6bit bit data is 8, thus 18T to 26T in the time OE signal remain high level.Like this, the OE signal keeps the time of high level to be (T/4+8T)=33T/4 continuously in showing 1bit position and 6bit bit data process.
In like manner, after the 6bit bit data shows, then show 2bit position, 5bit position, 3bit position and 4bit bit data.The OE signal keeps the time of high level to be (T/2+4T)=9T/2 continuously in showing 2bit position and 5bit bit data process.The OE signal keeps the time of high level to be (T+2T)=3T continuously in showing 3bit position and 4bit bit data process.After showing, the 4bit bit data begins next cycle.
As fully visible, obtaining the shortest pulse width period of OE signal in one-period is 3T.Pulsewidth with respect to the OE signal T/8 of 0bit position has been brought up to 24 times, is greatly improved.
Embodiment two
Suppose that the video data position is 8, grey level is 256 grades, adopts timesharing by turn to light, and promptly extracts the one digit number certificate successively from a byte data, divide and light corresponding pixel for 8 times, the time of lighting each time of each correspondence is different with the dutycycle of turn-off time.If the time of lighting increases progressively from the low level to a high position successively, then the He Cheng time of lighting will have 256 kinds of combinations.The definition time of lighting adds that the turn-off time is a chronomere, is made as T.The minimum weight coefficient of data bit is made as 1/32, and then the weighting coefficient of 0bit, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit data bit is respectively 1/32,1/16,1/8,1/4,1/2,1,2,4.At this moment, weighting coefficient is 5 less than 1 data bit number, more than or equal to the data bit number be 3, therefore need and to split greater than 1 weighting coefficient, present embodiment splits into 1,1,1,1 with the weighting coefficient 4 of 7bit data bit, the number that obtains more than or equal to 1 weighting coefficient is 6, will light with making up more than or equal to 1 weighting coefficient position less than 1 weighting coefficient position again, specifically can be referring to embodiment one.Certainly, also weighting coefficient 4 can be split into various combinations such as 1,1,2 here.
Embodiment three
Suppose that the video data position is 10, grey level is 1024 grades, adopts timesharing by turn to light, and promptly extracts the one digit number certificate successively from a byte data, divide and light corresponding pixel for 10 times, the time of lighting each time of each correspondence is different with the dutycycle of turn-off time.If the time of lighting increases progressively from the low level to a high position successively, then the He Cheng time of lighting will have 1024 kinds of combinations.The definition time of lighting adds that the turn-off time is a chronomere, is made as T.The minimum weight coefficient of data bit is made as 1/64, then the weighting coefficient of 0bit, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit, 8bit, 9bit data bit is respectively 1/32,1/16,1/8,1/4,1/2,1,2,4,8,16, and promptly the time of lighting of 0bit, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit, 8bit, 9bi is respectively T/32, T/16, T/8, T/4, T/2, T, 2T, 4T, 8T, 16T.Certainly, this brightness is temporal cumulative effects.As a specific implementation, the order that present embodiment adopts head and the tail to combine is lighted each data bit, promptly order is lighted 0bit, 9bit, 1bit, 8bit, 2bit, 7bit, 3bit, 6bit, 4bit and 5bit data bit, and the logical relation between OE signal and the transmission data bit is referring to Fig. 2.Certainly, also has the multiple sequential combination mode of lighting according to thinking of the present invention.
N equals 5 in the present embodiment, and the weighting coefficient of n+1=6 bit data position has been made as 1.Certainly, also the weighting coefficient of n=5 bit data position can be made as 1,0bit then, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit, 8bit, the weighting coefficient of 9bit data bit is respectively 1/16,1/8,1/4,1/2,1,2,4,8,16,32, the weighting coefficient of n-1=4 bit data position can also be made as 1, then 0bit, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit, 8bit, the weighting coefficient of 9bit data bit is respectively 1/8,1/4,1/2,1,2,4,8,16,32,64.These all are that proper data bit weighting coefficient is set scheme.
Explanation by above-mentioned embodiment, when can being to reach technological means and the effect that predetermined purpose takes to be able to more deeply and concrete understanding to the present invention, yet embodiment and appended diagram only provide with reference to the usefulness of explanation, be not to be used for the present invention is limited.
Claims (10)
1. a method that increases the LED display refreshing frequency is characterized in that, sets corresponding weighting coefficient according to the duration of lighting of each data bit, and wherein weighting coefficient has two at least less than 1 data bit number; Weighting coefficient made up more than or equal to 1 data bit less than 1 data bit and weighting coefficient light.
2. the method for increase LED display refreshing frequency according to claim 1, it is characterized in that, when weighting coefficient less than 1 data bit number greater than weighting coefficient during more than or equal to 1 data bit number, with weighting coefficient greater than 1 split, make weighting coefficient be no less than weighting coefficient less than 1 number, will light with making up less than 1 weighting coefficient position again more than or equal to 1 weighting coefficient position more than or equal to 1 number.
3. the method for increase LED display refreshing frequency according to claim 1 is characterized in that, by its length series arrangement of lighting duration, establishing data bit is 2n with each data bit, and the weighting coefficient of n position or n ± 1 bit data position is made as 1.
4. according to the method for each described increase LED display refreshing frequency in the claim 1 to 3, it is characterized in that, each data bit is arranged by the size order of its weighting coefficient, light by the combined order of head and the tail again.
5. the method for increase LED display refreshing frequency according to claim 1, it is characterized in that, described data bit is 8, the weighting coefficient of 0bit, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit data bit is respectively 1/8,1/4,1/2,1,2,4,8,16, lights order and is followed successively by 0bit, 6bit, 1bit, 5bit, 2bit, 7bit, 4bit and 3bit data bit.
6. according to the method for claim 1 or 4 described increase LED display refreshing frequencys, it is characterized in that, described data bit is 8, the weighting coefficient of 0bit, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit data bit is respectively 1/8,1/4,1/2,1,2,4,8,16, lights order and is followed successively by 0bit, 7bit, 1bit, 6bit, 2bit, 5bit, 3bit and 4bit data bit.
7. the method for increase LED display refreshing frequency according to claim 2, it is characterized in that, described data bit is 8, the weighting coefficient of 0bit, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit data bit is respectively 1/32,1/16,1/8,1/4,1/2,1,2,4, the weighting coefficient 4 of 7bit data bit is split into 1,1,1,1, perhaps split into 1,1,2.
8. according to the method for claim 1 or 3 described increase LED display refreshing frequencys, it is characterized in that, described data bit is 10, the weighting coefficient of 0bit, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit, 8bit, 9bit data bit is respectively 1/32,1/16,1/8,1/4,1/2,1,2,4,8,16, and the order that adopts head and the tail to combine is lighted each data bit.
9. according to the method for claim 1 or 3 described increase LED display refreshing frequencys, it is characterized in that, described data bit is 10, and the weighting coefficient of 0bit, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit, 8bit, 9bit data bit is respectively 1/16,1/8,1/4,1/2,1,2,4,8,16,32.
10. according to the method for claim 1 or 3 described increase LED display refreshing frequencys, it is characterized in that, described data bit is 10, and the weighting coefficient of 0bit, 1bit, 2bit, 3bit, 4bit, 5bit, 6bit, 7bit, 8bit, 9bit data bit is respectively 1/8,1/4,1/2,1,2,4,8,16,32,64.
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| CN107346652A (en) * | 2017-08-07 | 2017-11-14 | 杭州视芯科技有限公司 | LED display and its driving method |
| US10705631B2 (en) | 2012-11-06 | 2020-07-07 | Hewlett-Packard Development Company, L.P. | Interactive display |
| CN111696483A (en) * | 2020-07-10 | 2020-09-22 | 京东方科技集团股份有限公司 | Display panel, driving method thereof and display device |
| CN111916023A (en) * | 2020-07-31 | 2020-11-10 | 无锡力芯微电子股份有限公司 | LED display screen and display method thereof |
| CN112785965A (en) * | 2019-11-11 | 2021-05-11 | 杭州海康威视数字技术股份有限公司 | Data display method, device and system |
| CN114267277A (en) * | 2021-12-14 | 2022-04-01 | Oppo广东移动通信有限公司 | Display control method and device, computer readable storage medium and electronic device |
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| CN111916023B (en) * | 2020-07-31 | 2023-09-12 | 无锡力芯微电子股份有限公司 | LED display screen and display method thereof |
| CN114267277A (en) * | 2021-12-14 | 2022-04-01 | Oppo广东移动通信有限公司 | Display control method and device, computer readable storage medium and electronic device |
| CN114267277B (en) * | 2021-12-14 | 2023-07-14 | Oppo广东移动通信有限公司 | Display control method and device, computer readable storage medium and electronic equipment |
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Inventor after: Wei Zhimin Inventor after: Lu Junfeng Inventor after: Liang Enzhi Inventor after: Pang Fengjiang Inventor before: Pang Fengjiang |