CN101989397B - 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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- CN101989397B CN101989397B CN200910162808.9A CN200910162808A CN101989397B CN 101989397 B CN101989397 B CN 101989397B CN 200910162808 A CN200910162808 A CN 200910162808A CN 101989397 B CN101989397 B CN 101989397B
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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, a kind of particularly method that increases 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 respectively each scanning board by data again.Scanning board drives enable signal (OE signal), latch signal (Latch signal) and the clock signal (CLK signal) of chip that video data is delivered to each LED lamp by control, makes it show corresponding video image.Data between scanning board and driving chip transmit referring to Fig. 1.
The refreshing frequency of LED large screen display video image is higher, and the image effect that human eye is seen is just better.Not only image does not have the sensation of flicker, and the image that video camera is taken also can not glimmer.But the refreshing frequency of LED large screen display video image can not unrestrictedly improve.Owing to driving chip to be subject to the restriction of the minimum effective width of its OE signal, so that the refreshing frequency of LED giant-screen video image can not be accomplished is very high, become a technical matters that is difficult to overcome.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of method that increases LED display refreshing frequency, and the method can make to adopt the LED display of same driving chip 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:
Set corresponding weighting coefficient according to the duration of lighting of each data bit, wherein weighting coefficient is less than 1 data bit number and has two at least; Weighting coefficient is less than to 1 data bit and weighting coefficient to be more than or equal to 1 data bit and to combine and light.
As a kind of improvement project, in said method, in the time that weighting coefficient is less than 1 data bit number and is greater than weighting coefficient and is more than or equal to 1 data bit number, weighting coefficient is greater than to 1 split, make weighting coefficient be more than or equal to 1 number and be no less than the number that weighting coefficient is less than 1, then the weighting coefficient position that is less than 1 is combined and lighted with the weighting coefficient position that is more than or equal to 1.
As a kind of improvement project, in said method, the length order that each data bit is lighted to duration by it is arranged, and establishing data bit is 2n, and the weighting coefficient of n position or bit data position, n ± 1 is made as to 1.
As a kind of improvement project, in said method, each data bit is arranged by the size order of its weighting coefficient, then light by the combined order of head and the tail.
The present invention is by adjusting the order of lighting of the each data bit of video data, the appearance position of mobile OE signal in one-period, greatly increase the width of OE signal effective time, reduce very dexterously and driven the chip requirement of the effective time to OE signal, made to adopt the LED display of same driving chip to obtain the object of higher refreshing frequency thereby reached.
Brief description of the drawings
Data between Fig. 1 scanning board and driving chip transmit schematic diagram;
Sequential relationship schematic diagram between Fig. 2 OE signal of the present invention and data transmit.
Embodiment
Technological means and effect of taking for reaching predetermined object 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.
The logical relation driving between chip input signal and output data has been described in Fig. 1.FPGA drives shift clock that Clk signal is sent to and is driven in chip, and video data is sent to and is driven in chip by SIN signal wire, all video datas position makes Latch signal send a pulse signal after transmitting, and data is latched to and drives on chip, controls the light on and off of LED lamp.Meanwhile, FPGA is according to the width that is sent to the weighted value control OE signal that drives chip data, i.e. corresponding different gray scale.
Embodiment mono-
Suppose that video data position is 8, grey level is 256 grades, adopts timesharing by turn to light, and from a byte data, extracts successively a data, divide and light corresponding pixel 8 times, the time of lighting each time of each correspondence is different from the dutycycle of turn-off time.If the time of lighting increases progressively successively from low level to a high position, the synthetic 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 to 1/8, 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, and 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 OE signal of the present invention and has transmitted the logical relation between data bit.Can find out, in order to increase the pulse width of OE signal, in transmitting data bit, not transmit in order each data bit.The order that the present embodiment adopts head and the tail to combine is lighted each data bit, and order is lighted 0bit, 7bit, 1bit, 6bit, 2bit, 5bit, 3bit and 4bit data bit.Certainly, also has the multiple sequential combination mode of lighting according to thinking of the present invention, as order is lighted 0bit, 6bit, 1bit, 5bit, 2bit, 7bit, 4bit and 3bit data bit etc.
In 0 moment, Latch signal sends pulse signal, the data of 0bit position are latched into and are driven in chip, under the effective situation of OE signal high level, if OE signal is high level, drive chip to export the data of 0bit position, if OE signal is low level, driving chip output pin is high-impedance state.Because the weighting coefficient of the corresponding OE signal in 0bit position is 1/8, thus within 0～7T/8 time the corresponding low level of OE signal.In the 7T/8 moment, OE signal becomes high level, and in 7T/8 arrives the T time, OE keeps high level, is (T-7T/8)=T/8 for the effective time of 0bit position OE signal, meets the weighted value of 0bit position.In the T moment, Latch signal sends pulse signal, the data of 7bit position are latched into and are driven in chip, under the effective situation of OE signal high level, if OE signal is high level, drive chip to export the data of 7bit position, if OE signal is low level, driving chip output pin is high-impedance state.Because the weighting coefficient of 7bit bit data is 16, so remain effective high level at T to OE signal in the 17T time.Like this, be always high level in 0bit position to OE signal in the change procedure of 7bit position, and to keep the time of high level be (T/8+16T)=129T/8.
In the 17T moment, Latch signal sends pulse signal, the data of 1bit position are latched into and are driven in chip, under the effective situation of OE signal high level, if OE signal is high level, drive chip to export the data of 1bit position, if OE signal is low level, driving chip output pin is 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.In (17T+3T/4) moment, OE signal becomes high level, in (17T+3T/4) arrives the 18T time, OE signal keeps high level,, for being (18T-(17T+3T/4))=T/4 the effective time of 1bit position OE signal, meet the weighted value of 1bit position.In the 18T moment, Latch signal sends pulse signal, the data of 6bit position are latched into and are driven in chip, under the effective situation of OE signal high level, if OE signal is high level, drive chip to export the data of 6bit position, if OE signal is low level, driving chip output pin is high-impedance state.Because the weighting coefficient of 6bit bit data is 8, so remain high level at 18T to OE signal in the 26T time.Like this, be (T/4+8T)=33T/4 showing in 1bit position and 6bit bit data process that OE signal keeps the time of high level continuously.
In like manner, after 6bit bit data shows, then show 2bit position, 5bit position, 3bit position and 4bit bit data.Be (T/2+4T)=9T/2 showing in 2bit position and 5bit bit data process that OE signal keeps the time of high level continuously.Be (T+2T)=3T showing in 3bit position and 4bit bit data process that OE signal keeps the time of high level continuously.4bit bit data starts next cycle after showing.
As fully visible, in one-period, obtaining the shortest pulse width period of OE signal 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 bis-
Suppose that video data position is 8, grey level is 256 grades, adopts timesharing by turn to light, and from a byte data, extracts successively a data, divide and light corresponding pixel 8 times, the time of lighting each time of each correspondence is different from the dutycycle of turn-off time.If the time of lighting increases progressively successively from low level to a high position, the synthetic 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 to 1/32, and 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.Now, it is 5 that weighting coefficient is less than 1 data bit number, the data bit number being more than or equal to is 3, therefore need the weighting coefficient that is greater than 1 to split, the present embodiment splits into 1,1,1,1 by the weighting coefficient of 7bit data bit 4, the number that obtains the weighting coefficient that is more than or equal to 1 is 6, then the weighting coefficient position that is less than 1 is combined and lighted with the weighting coefficient position that is more than or equal to 1, specifically can be referring to embodiment mono-.Certainly, also weighting coefficient 4 can be split into the various combinations such as 1,1,2 here.
Embodiment tri-
Suppose that video data position is 10, grey level is 1024 grades, adopts timesharing by turn to light, and from a byte data, extracts successively a data, divide and light corresponding pixel 10 times, the time of lighting each time of each correspondence is different from the dutycycle of turn-off time.If the time of lighting increases progressively successively from low level to a high position, the synthetic 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 to 1/64, 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 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 the present embodiment adopts head and the tail to combine is lighted each data bit, order is lighted 0bit, 9bit, 1bit, 8bit, 2bit, 7bit, 3bit, 6bit, 4bit and 5bit data bit, and the logical relation between OE signal and 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.
In the present embodiment, n equals 5, and the weighting coefficient of n+1=6 bit data position has been made as to 1.Certainly, also the weighting coefficient of n=5 bit data position can be made as to 1, 0bit, 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 to 1, 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 are all that proper data bit weighting coefficient is set scheme.
By the explanation of above-mentioned embodiment, when being able to more deeply and concrete understanding for technological means and effect of reaching predetermined object and taking the present invention, but embodiment and appended diagram be only to provide with reference to the use of explanation, be not used for the present invention to be limited.
Claims (9)
1. a method that increases LED display refreshing frequency, is characterized in that,
Set corresponding weighting coefficient according to the duration of lighting of each data bit, wherein weighting coefficient is less than 1 data bit number and has two at least; Weighting coefficient is less than to 1 data bit and weighting coefficient to be more than or equal to 1 data bit and to combine and light;
Wherein, in the time that weighting coefficient is less than 1 data bit number and is greater than weighting coefficient and is more than or equal to 1 data bit number, weighting coefficient is greater than to 1 split, make weighting coefficient be more than or equal to 1 number and be no less than the number that weighting coefficient is less than 1, then the weighting coefficient position that is less than 1 is combined and lighted with the weighting coefficient position that is more than or equal to 1.
2. the method for increase LED display refreshing frequency according to claim 1, is characterized in that, the length order that each data bit is lighted to duration by it is arranged, and establishing data bit is 2n, and the weighting coefficient of n position or bit data position, n ± 1 is made as to 1.
3. the method for increase LED display refreshing frequency according to claim 1 and 2, is characterized in that, each data bit is arranged by the size order of its weighting coefficient, then light by the combined order of head and the tail.
4. 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.
5. the method for increase LED display refreshing frequency according to claim 3, 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.
6. 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 1/32,1/16,1/8,1/4,1/2,1,2,4, the weighting coefficient of 7bit data bit 4 is split into 1,1,1,1, or split into 1,1,2.
7. the method for increase LED display refreshing frequency according to claim 1 and 2, 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.
8. the method for increase LED display refreshing frequency according to claim 1 and 2, 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.
9. the method for increase LED display refreshing frequency according to claim 1 and 2, 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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| US10705631B2 (en) | 2012-11-06 | 2020-07-07 | Hewlett-Packard Development Company, L.P. | Interactive display |
| CN107346652B (en) * | 2017-08-07 | 2023-07-21 | 杭州视芯科技股份有限公司 | LED display device and driving method thereof |
| CN112785965B (en) * | 2019-11-11 | 2022-03-25 | 杭州海康威视数字技术股份有限公司 | Data display method, device and system |
| CN111696483B (en) * | 2020-07-10 | 2022-04-08 | 京东方科技集团股份有限公司 | Display panel, driving method thereof and display device |
| 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 |
| 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 |