技术领域technical field
本发明属于LED(Light Emitting Diode，发光二极管)视频显示控制技术领域，特别涉及一种增加LED显示屏刷新频率的方法。The invention belongs to the technical field of LED (Light Emitting Diode, light-emitting diode) video display control, and in particular relates to a method for increasing the refresh frequency of an LED display screen.
背景技术Background technique
一般LED控制系统包含发送器，分配器和扫描三部分。视频信号通过发送器传送到分配器，分配器再将数据分别发送到每个扫描板。扫描板通过控制驱动芯片的使能信号(OE信号)、锁存信号(Latch信号)和时钟信号(CLK信号)将视频数据送到每个LED灯，使其显示相应的视频图像。扫描板与驱动芯片之间的数据传送参见图1。The general LED control system includes three parts: transmitter, distributor and scan. The video signal is transmitted to the distributor through the transmitter, and the distributor sends the data to each scanning board respectively. The scanning board sends video data to each LED light by controlling the enable signal (OE signal), latch signal (Latch signal) and clock signal (CLK signal) of the driver chip to make it display the corresponding video image. Refer to Figure 1 for the data transmission between the scanning board and the driver chip.
LED大屏幕显示视频图像的刷新频率越高，人眼看见的图像效果就越好。不但图像不会有闪烁的感觉，而且摄像机拍摄的图像也不会闪烁的。但是，LED大屏幕显示视频图像的刷新频率不能无限制地提高。由于驱动芯片受到其OE信号的最小有效宽度的限制，所以LED大屏幕视频图像的刷新频率不能做到很高，成为一个难以克服的技术问题。The higher the refresh rate of the video image displayed on the large LED screen, the better the image effect seen by the human eye. Not only will the images not flicker, but the images captured by the camera will also not flicker. However, the refresh rate of video images displayed on LED large screens cannot be increased without limit. Since the driver chip is limited by the minimum effective width of its OE signal, the refresh frequency of the LED large-screen video image cannot be very high, which has become an insurmountable technical problem.
发明内容Contents of the invention
本发明要解决的技术问题是提出一种增加LED显示屏刷新频率的方法，该方法可以使采用同样驱动芯片的LED显示屏达到更高的刷新频率。The technical problem to be solved by the present invention is to propose a method for increasing the refresh frequency of LED display screens, which can enable LED display screens using the same drive chip to achieve a higher refresh rate.
为解决上述技术问题，本发明提出的增加LED显示屏刷新频率的方法如下：In order to solve the problems of the technologies described above, the method for increasing the refresh rate of the LED display screen proposed by the present invention is as follows:
根据每个数据位的点亮时长设定相应的加权系数，其中加权系数小于1的数据位个数至少有两个；将加权系数小于1的数据位与加权系数大于等于1的数据位进行组合点亮。Set the corresponding weighting coefficient according to the lighting time of each data bit, wherein there are at least two data bits with a weighting coefficient less than 1; combine the data bits with a weighting coefficient less than 1 and the data bits with a weighting coefficient greater than or equal to 1 light up.
作为一种改进方案，在上述方法中，当加权系数小于1的数据位个数大于加权系数大于等于1的数据位个数时，将加权系数大于1的拆分开，使加权系数大于等于1的个数不少于加权系数小于1的个数，再将小于1的加权系数位与大于等于1的加权系数位进行组合点亮。As an improvement, in the above method, when the number of data bits with a weighting coefficient less than 1 is greater than the number of data bits with a weighting coefficient greater than or equal to 1, split the weighting coefficient greater than 1, so that the weighting coefficient is greater than or equal to 1 The number is not less than the number of weighting coefficients less than 1, and then the weighting coefficient bits less than 1 and the weighting coefficient bits greater than or equal to 1 are combined to light up.
作为一种改进方案，在上述方法中，将各数据位按其点亮时长的长短顺序排列，设数据位为2n，将第n位或第n±1位数据位的加权系数设为1。As an improved solution, in the above method, the data bits are arranged in the order of their lighting duration, the data bits are set to 2n, and the weighting coefficient of the nth or n±1th data bits is set to 1.
作为一种改进方案，在上述方法中，将各数据位按其加权系数的大小顺序排列，再按首尾相组合的顺序进行点亮。As an improved solution, in the above method, each data bit is arranged in the order of the size of its weighting coefficient, and then lit up in the order of combination of the first and the last.
本发明通过调整视频数据每个数据位的点亮顺序，移动OE信号在一个周期内的出现位置，极大地增加了OE信号有效时间的宽度，非常巧妙地降低了驱动芯片对OE信号的有效时间的要求，从而达到了使采用同样驱动芯片的LED显示屏得到更高的刷新频率的目的。The invention adjusts the lighting sequence of each data bit of the video data and moves the position of the OE signal in one cycle, greatly increasing the width of the effective time of the OE signal, and very cleverly reducing the effective time of the drive chip for the OE signal requirements, so as to achieve the purpose of achieving a higher refresh rate for LED displays using the same driver chip.
附图说明Description of drawings
图1扫描板与驱动芯片之间的数据传送示意图；Figure 1 Schematic diagram of data transmission between the scanning board and the driver chip;
图2本发明OE信号与数据传送之间的时序关系示意图。FIG. 2 is a schematic diagram of the timing relationship between the OE signal and data transmission in the present invention.
具体实施方式Detailed ways
为更进一步阐述本发明为达成预定目的所采取的技术手段及功效，以下结合附图及实施例，对本发明提出的增加LED显示屏刷新频率的方法详细说明如下。In order to further explain the technical means and effects of the present invention to achieve the intended purpose, the method for increasing the refresh frequency of the LED display proposed by the present invention is described in detail below in conjunction with the accompanying drawings and embodiments.
图1中描述了驱动芯片输入信号与输出数据之间的逻辑关系。FPGA驱动移位时钟将Clk信号传送到驱动芯片中，并将视频数据通过SIN信号线传送到驱动芯片中，所有视频数据位传送之后令Latch信号发出一个脉冲信号，使数据被锁存到驱动芯片上，控制LED灯的亮灭。同时，FPGA根据传送到驱动芯片数据的权重值控制OE信号的宽度，即对应不同的灰度。Figure 1 describes the logical relationship between the input signal and output data of the driver chip. The FPGA drives the shift clock to transmit the Clk signal to the driver chip, and transmits the video data to the driver chip through the SIN signal line. After all the video data bits are transmitted, the Latch signal sends a pulse signal, so that the data is latched to the driver chip. On, control the LED lights on and off. At the same time, the FPGA controls the width of the OE signal according to the weight value of the data sent to the driver chip, which corresponds to different gray levels.
实施例一Embodiment one
假设视频数据位为8位，灰度级别为256级，采用逐位分时点亮，即从一个字节数据中依次提取出一位数据，分8次点亮对应的像素，每一位对应的每一次点亮时间与关断时间的占空比不同。如果点亮时间从低位到高位依次递增，则合成的点亮时间将会有256种组合。定义点亮时间加上关断时间为一个时间单位，设为T。将数据位的最小加权系数设为1/8，则第0bit、第1bit、第2bit、第3bit、第4bit、第5bit、第6bit、第7bit数据位的加权系数分别为1/8、1/4、1/2、1、2、4、8、16，即第0bit、第1bit、第2bit、第3bit、第4bit、第5bit、第6bit、第7bit的点亮时间分别为T/8、T/4、T/2、T、2T、4T、8T、16T。当然，这个亮度是时间上的累加效果。图2说明了本发明OE信号与传送数据位之间的逻辑关系。可以看出，为了能够增加OE信号的脉冲宽度，在传送数据位的时候并没有按顺序传送各数据位。本实施例采用首尾相结合的顺序点亮各数据位，即顺序点亮第0bit、第7bit、第1bit、第6bit、第2bit、第5bit、第3bit和第4bit数据位。当然，按照本发明的思路还有多种点亮顺序组合方式，如顺序点亮第0bit、第6bit、第1bit、第5bit、第2bit、第7bit、第4bit和第3bit数据位等。Assuming that the video data bits are 8 bits and the gray level is 256, the bit-by-bit time-sharing lighting is adopted, that is, one bit of data is sequentially extracted from one byte of data, and the corresponding pixel is lighted up in 8 times, and each bit corresponds to The duty cycle of each lighting time is different from that of the off time. If the lighting time increases sequentially from the low bit to the high bit, there will be 256 combinations of the combined lighting time. Define the light-on time plus the off-time as a time unit, set as T. Set the minimum weighting coefficient of the data bit to 1/8, then the weighting coefficients of the 0th bit, the 1st bit, the 2nd bit, the 3rd bit, the 4th bit, the 5th bit, the 6th bit, and the 7th bit are 1/8 and 1/8 respectively. 4, 1/2, 1, 2, 4, 8, 16, that is, the lighting time of the 0th bit, the 1st bit, the 2nd bit, the 3rd bit, the 4th bit, the 5th bit, the 6th bit, and the 7th bit are T/8, T/4, T/2, T, 2T, 4T, 8T, 16T. Of course, this brightness is the cumulative effect of time. FIG. 2 illustrates the logical relationship between the OE signal and the transmitted data bits in the present invention. It can be seen that, in order to increase the pulse width of the OE signal, the data bits are not transmitted in sequence when transmitting the data bits. In this embodiment, each data bit is lighted up in order of combining end to end, that is, the 0th bit, the 7th bit, the 1st bit, the 6th bit, the 2nd bit, the 5th bit, the 3rd bit and the 4th bit are lighted up sequentially. Of course, according to the idea of the present invention, there are also various lighting sequence combinations, such as sequentially lighting the 0th bit, the 6th bit, the 1st bit, the 5th bit, the 2nd bit, the 7th bit, the 4th bit, and the 3rd bit.
在0时刻，Latch信号发出脉冲信号，将第0bit位的数据锁存到驱动芯片中，在OE信号高电平有效的情形下，如果OE信号为高电平，则驱动芯片输出第0bit位的数据，如果OE信号为低电平，则驱动芯片输出引脚为高阻状态。因为第0bit位对应OE信号的加权系数为1/8，所以在0～7T/8时间内OE信号对应低电平。在7T/8时刻，OE信号变为高电平，在7T/8到T时间内OE保持高电平，则对于第0bit位OE信号的有效时间为(T-7T/8)＝T/8，满足第0bit位的权重值。在T时刻，Latch信号发出脉冲信号，将第7bit位的数据锁存到驱动芯片中，在OE信号高电平有效的情形下，如果OE信号为高电平，则驱动芯片输出第7bit位的数据，如果OE信号为低电平，则驱动芯片输出引脚为高阻状态。因为第7bit位数据的加权系数为16，所以在T到17T时间内OE信号始终保持有效的高电平。这样，在第0bit位向第7bit位的变化过程中OE信号始终为高电平，并且保持高电平的时间为(T/8+16T)＝129T/8。At time 0, the Latch signal sends out a pulse signal to latch the data of the 0th bit into the driver chip. Data, if the OE signal is low, the output pin of the driver chip is in a high-impedance state. Because the weighting coefficient corresponding to the OE signal at bit 0 is 1/8, the OE signal corresponds to a low level within the time period of 0 to 7T/8. At the moment of 7T/8, the OE signal becomes high level, and OE remains high level during the period from 7T/8 to T, then the valid time for the 0th bit OE signal is (T-7T/8)=T/8 , satisfying the weight value of bit 0. At time T, the Latch signal sends out a pulse signal to latch the data of the 7th bit into the driver chip. Data, if the OE signal is low, the output pin of the driver chip is in a high-impedance state. Because the weighting coefficient of the 7th bit data is 16, the OE signal always maintains an effective high level during the time from T to 17T. In this way, the OE signal is always at a high level during the transition from the 0th bit to the 7th bit, and the time for maintaining the high level is (T/8+16T)=129T/8.
在17T时刻，Latch信号发出脉冲信号，将第1bit位的数据锁存到驱动芯片中，在OE信号高电平有效的情形下，如果OE信号为高电平，则驱动芯片输出第1bit位的数据，如果OE信号为低电平，驱动芯片输出引脚为高阻状态。因为第1bit位对应OE信号的加权系数为1/4，所以在17T到(17T+3T/4)时间内OE信号对应低电平。在(17T+3T/4)时刻，OE信号变为高电平，在(17T+3T/4)到18T时间内OE信号保持高电平，则对于第1bit位OE信号的有效时间为(18T-(17T+3T/4))＝T/4，满足第1bit位的权重值。在18T时刻，Latch信号发出脉冲信号，将第6bit位的数据锁存到驱动芯片中，在OE信号高电平有效的情形下，如果OE信号为高电平，则驱动芯片输出第6bit位的数据，如果OE信号为低电平，则驱动芯片输出引脚为高阻状态。因为第6bit位数据的加权系数为8，所以在18T到26T时间内OE信号始终保持高电平。这样，在显示第1bit位和第6bit位数据过程中OE信号连续保持高电平的时间为(T/4+8T)＝33T/4。At 17T, the Latch signal sends out a pulse signal to latch the data of the 1st bit into the driver chip. When the OE signal is at a high level, if the OE signal is at a high level, the driver chip outputs the data of the 1st bit. Data, if the OE signal is low, the output pin of the drive chip is in a high-impedance state. Because the weighting factor of the first bit corresponding to the OE signal is 1/4, the OE signal corresponds to a low level within the time period from 17T to (17T+3T/4). At the time of (17T+3T/4), the OE signal becomes high level, and the OE signal remains high during the period from (17T+3T/4) to 18T, then the valid time for the first bit OE signal is (18T -(17T+3T/4))=T/4, satisfying the weight value of the first bit. At 18T, the Latch signal sends out a pulse signal to latch the data of the 6th bit into the driver chip. When the OE signal is active at high level, if the OE signal is at a high level, the driver chip outputs the data of the 6th bit. Data, if the OE signal is low, the output pin of the driver chip is in a high-impedance state. Because the weighting coefficient of the 6th bit data is 8, the OE signal is always kept at a high level within the time period from 18T to 26T. In this way, during the process of displaying the 1st bit and the 6th bit data, the time for the OE signal to keep high level continuously is (T/4+8T)=33T/4.
同理，在第6bit位数据显示后，接着显示第2bit位、第5bit位、第3bit位和第4bit位数据。在显示第2bit位和第5bit位数据过程中OE信号连续保持高电平的时间为(T/2+4T)＝9T/2。在显示第3bit位和第4bit位数据过程中OE信号连续保持高电平的时间为(T+2T)＝3T。第4bit位数据显示之后开始下一个周期。Similarly, after the 6th bit data is displayed, then the 2nd bit, 5th bit, 3rd bit and 4th bit data are displayed. During the process of displaying the 2nd bit and the 5th bit data, the time for the OE signal to keep high level continuously is (T/2+4T)=9T/2. During the process of displaying the data of the 3rd bit and the 4th bit, the time for the OE signal to keep high level continuously is (T+2T)=3T. The next cycle starts after the 4th bit data is displayed.
综上可见，在一个周期中得到OE信号最短的脉宽周期是3T。相对于第0bit位的OE信号T/8的脉宽提高到了24倍，有了很大的提升。It can be seen from the above that the shortest pulse width period for obtaining the OE signal in one period is 3T. Compared with the pulse width of the OE signal T/8 of the 0th bit, it has been increased to 24 times, which has been greatly improved.
实施例二Embodiment two
假设视频数据位为8位，灰度级别为256级，采用逐位分时点亮，即从一个字节数据中依次提取出一位数据，分8次点亮对应的像素，每一位对应的每一次点亮时间与关断时间的占空比不同。如果点亮时间从低位到高位依次递增，则合成的点亮时间将会有256种组合。定义点亮时间加上关断时间为一个时间单位，设为T。将数据位的最小加权系数设为1/32，则第0bit、第1bit、第2bit、第3bit、第4bit、第5bit、第6bit、第7bit数据位的加权系数分别为1/32、1/16、1/8、1/4、1/2、1、2、4。此时，加权系数小于1的数据位个数为5，大于等于的数据位个数为3，因此需要将大于1的加权系数拆分开，本实施例将第7bit数据位的加权系数4拆分成1、1、1、1，得到大于等于1的加权系数的个数为6，再将小于1的加权系数位与大于等于1的加权系数位进行组合点亮，具体可参见实施例一。当然，这里也可将加权系数4拆分成1、1、2等不同组合。Assuming that the video data bits are 8 bits and the gray level is 256, the bit-by-bit time-sharing lighting is adopted, that is, one bit of data is sequentially extracted from one byte of data, and the corresponding pixel is lighted up in 8 times, and each bit corresponds to The duty cycle of each lighting time is different from that of the off time. If the lighting time increases sequentially from the low bit to the high bit, there will be 256 combinations of the combined lighting time. Define the light-on time plus the off-time as a time unit, set as T. Set the minimum weighting coefficient of the data bit to 1/32, then the weighting coefficients of the 0th bit, the 1st bit, the 2nd bit, the 3rd bit, the 4th bit, the 5th bit, the 6th bit, and the 7th bit are 1/32, 1/32, respectively. 16, 1/8, 1/4, 1/2, 1, 2, 4. At this time, the number of data bits whose weighting coefficient is less than 1 is 5, and the number of data bits greater than or equal to 3 is 3. Therefore, the weighting coefficient greater than 1 needs to be split. In this embodiment, the weighting coefficient of the 7th bit data bit is 4. Divided into 1, 1, 1, 1, the number of weighting coefficients greater than or equal to 1 is 6, and then the weighting coefficient bits less than 1 and the weighting coefficient bits greater than or equal to 1 are combined to light up. For details, please refer to Embodiment 1 . Of course, the weighting coefficient 4 can also be divided into different combinations such as 1, 1, and 2 here.
实施例三Embodiment three
假设视频数据位为10位，灰度级别为1024级，采用逐位分时点亮，即从一个字节数据中依次提取出一位数据，分10次点亮对应的像素，每一位对应的每一次点亮时间与关断时间的占空比不同。如果点亮时间从低位到高位依次递增，则合成的点亮时间将会有1024种组合。定义点亮时间加上关断时间为一个时间单位，设为T。将数据位的最小加权系数设为1/64，则第0bit、第1bit、第2bit、第3bit、第4bit、第5bit、第6bit、第7bit、第8bit、第9bit数据位的加权系数分别为1/32、1/16、1/8、1/4、1/2、1、2、4、8、16，即第0bit、第1bit、第2bit、第3bit、第4bit、第5bit、第6bit、第7bit、第8bit、第9bi的点亮时间分别为T/32、T/16、T/8、T/4、T/2、T、2T、4T、8T、16T。当然，这个亮度是时间上的累加效果。作为一个具体实现，本实施例采用首尾相结合的顺序点亮各数据位，即顺序点亮第0bit、第9bit、第1bit、第8bit、第2bit、第7bit、第3bit、第6bit、第4bit和第5bit数据位，OE信号与传送数据位之间的逻辑关系参见图2。当然，按照本发明的思路还有多种点亮顺序组合方式。Assuming that the video data bits are 10 bits and the gray level is 1024, the bit-by-bit time-sharing lighting is adopted, that is, one bit of data is sequentially extracted from one byte of data, and the corresponding pixel is lighted up 10 times, each bit corresponds to The duty cycle of each lighting time is different from that of the off time. If the lighting time increases sequentially from the low bit to the high bit, there will be 1024 combinations of the combined lighting time. Define the light-on time plus the off-time as a time unit, set as T. Set the minimum weighting coefficient of the data bit to 1/64, then the weighting coefficients of the 0th bit, the 1st bit, the 2nd bit, the 3rd bit, the 4th bit, the 5th bit, the 6th bit, the 7th bit, the 8th bit, and the 9th bit are respectively 1/32, 1/16, 1/8, 1/4, 1/2, 1, 2, 4, 8, 16, that is, the 0th bit, the 1st bit, the 2nd bit, the 3rd bit, the 4th bit, the 5th bit, and the The lighting times of 6bit, 7th bit, 8th bit and 9bi are T/32, T/16, T/8, T/4, T/2, T, 2T, 4T, 8T, 16T respectively. Of course, this brightness is the cumulative effect of time. As a specific implementation, in this embodiment, each data bit is illuminated in the order of combining the end to the end, that is, the 0th bit, the 9th bit, the 1st bit, the 8th bit, the 2nd bit, the 7th bit, the 3rd bit, the 6th bit, and the 4th bit are sequentially lit. Refer to Figure 2 for the logical relationship between the OE signal and the transmitted data bit and the 5th data bit. Certainly, according to the thought of the present invention, there are also many combinations of lighting sequences.
本实施例中n等于5，并将第n+1＝6位数据位的加权系数设为了1。当然，也可以将第n＝5位数据位的加权系数设为1，则第0bit、第1bit、第2bit、第3bit、第4bit、第5bit、第6bit、第7bit、第8bit、第9bit数据位的加权系数分别为1/16、1/8、1/4、1/2、1、2、4、8、16、32，还可以将第n-1＝4位数据位的加权系数设为1，则第0bit、第1bit、第2bit、第3bit、第4bit、第5bit、第6bit、第7bit、第8bit、第9bit数据位的加权系数分别为1/8、1/4、1/2、1、2、4、8、16、32、64。这些都是比较合适的数据位加权系数设定方案。In this embodiment, n is equal to 5, and the weighting coefficient of the n+1=6th data bit is set to 1. Of course, the weighting coefficient of the n=5th data bit can also be set to 1, then the 0th bit, the 1st bit, the 2nd bit, the 3rd bit, the 4th bit, the 5th bit, the 6th bit, the 7th bit, the 8th bit, and the 9th bit data The weighting coefficient of bit is respectively 1/16, 1/8, 1/4, 1/2, 1, 2, 4, 8, 16, 32, and the weighting coefficient of the n-1=4 data bits can also be set is 1, the weighting coefficients of the 0th bit, 1st bit, 2nd bit, 3rd bit, 4th bit, 5th bit, 6th bit, 7th bit, 8th bit, and 9th bit are 1/8, 1/4, 1/ 2, 1, 2, 4, 8, 16, 32, 64. These are relatively suitable data bit weighting coefficient setting schemes.
通过上述具体实施方式的说明，当可对本发明为达成预定目的所采取的技术手段及功效得以更加深入且具体的了解，然而具体实施方式及所附图示仅是提供参考与说明之用，并非用来对本发明加以限制。Through the description of the specific implementation above, the technical means and effects of the present invention to achieve the intended purpose can be understood more deeply and specifically. However, the specific implementation and the accompanying drawings are only for reference and illustration, not used to limit the invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910162808.9ACN101989397B (en) | 2009-08-07 | 2009-08-07 | Method for increasing refresh rate of LED (Light Emitting Diode) display screen |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910162808.9ACN101989397B (en) | 2009-08-07 | 2009-08-07 | Method for increasing refresh rate of LED (Light Emitting Diode) display screen |
| Publication Number | Publication Date |
|---|---|
| CN101989397A CN101989397A (en) | 2011-03-23 |
| CN101989397Btrue CN101989397B (en) | 2014-12-10 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910162808.9AExpired - Fee RelatedCN101989397B (en) | 2009-08-07 | 2009-08-07 | Method for increasing refresh rate of LED (Light Emitting Diode) display screen |
| Country | Link |
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| CN (1) | CN101989397B (en) |
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| CN101989397A (en) | 2011-03-23 |
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| CN101989397B (en) | Method for increasing refresh rate of LED (Light Emitting Diode) display screen | |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | Inventor after:Wei Zhimin Inventor after:Lu Junfeng Inventor after:Liang Enzhi Inventor after:Pang Fengjiang Inventor before:Pang Fengjiang | |
| CB03 | Change of inventor or designer information | ||
| CF01 | Termination of patent right due to non-payment of annual fee | Granted publication date:20141210 | |
| CF01 | Termination of patent right due to non-payment of annual fee |