CN103390387A - Frequency doubling display control method and system - Google Patents
Frequency doubling display control method and system Download PDFInfo
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- CN103390387A CN103390387A CN2013103118570A CN201310311857A CN103390387A CN 103390387 A CN103390387 A CN 103390387A CN 2013103118570 A CN2013103118570 A CN 2013103118570A CN 201310311857 A CN201310311857 A CN 201310311857A CN 103390387 A CN103390387 A CN 103390387A
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Abstract
The invention belongs to the technical field of display control, and provides a frequency doubling display control method and system. The method and the system utilize a frequency doubling technology, the number of orders of a high-order counter and a low-order counter in a gray level counter is adjusted, so that in a regular display cycle, display times of each scanning line is increased by corresponding frequency doubling times, and then a refresh rate is increased by corresponding frequency doubling times; and further, the larger the frequency doubling times are, the larger the increased times of the refresh rate are, so that the refresh rate of a dynamic scanning screen is further increased, the dynamic scanning screen can be suitable for an occasion with a requirement for a higher refresh rate, and the application field is expanded.
Description
Technical field
The invention belongs to the display control technology field, relate in particular to a kind of LED of being mainly used in show the control aspect, based on display control method and the system of frequency doubling technology.
Background technology
Show control field at LED, adopt pulse-length modulation (Pulse Width Modulation, PWM) mode, realize the adjusting to each LED luminosity.Specifically, be within fixing display cycle, by regulate LED bright/the time ratio that goes out, reach the purpose of LED brightness regulation.
For LED dynamic scan screen, it utilizes the vision of human eye to stop, and only shows a certain scan line sometime,, at next scan line of next time showing, so analogizes afterwards, and circulation shows.In order to promote display refresh rates, in prior art, generally with the disposable transmission of whole frame gradation data of dynamic scan screen and store into and drive in chip by master control set, afterwards, drive chips incorporate gradation data and outside grayscale clock, generate in order to the luminous pulse width modulating signal of driving LED.As shown in Figure 1, wherein, the gray scale counter that drives in chip is used for grayscale clock GCLK is counted, and output i position count value Q0～Qi, afterwards, the pulse-length modulation module in the driving chip is according to gradation data D0～Di and count value Q0～Qi, production burst bandwidth modulation signals.According to this pulse width modulating signal, one fixedly the display cycle be divided into the displaying time that N equates, in each displaying time, show in turn each scan line, and the displaying time non-overlapping copies of each scan line.That is to say, each scan line is divided into N demonstration, if m dynamic scan screen, each displaying time shows m scan line, the mode that shows is: after first scan line is completed and shown for the first time, carry out again the demonstration for the first time of second scan line, until the demonstration for the first time of m scan line is complete; Then carry out the demonstration for the second time of each scan line, so repeatedly, until complete the N time demonstration of all scan lines, as shown in Figure 2.In addition, when front frame shows, drive chip and must receive the gradation data of next frame, this gradation data is stored into and drives chip and the method for gated sweep is simple automatically, promoted the refresh rate of LED display, can effectively eliminate the fringe phenomena while taking.
But, along with the product of application LED display is more and more abundanter and people are more and more higher to the requirement of LED display, need LED display to have higher refresh rate, meet such as requirements such as high-speed captures.Above-mentioned LED shows that still there is room for promotion in control mode aspect refresh rate and prior art provides, application scenario that can't the higher refresh rate of to meet the need, and application is restricted.
Summary of the invention
The purpose of the embodiment of the present invention is to provide a kind of frequency multiplication display control method, although the LED that being intended to solve prior art provides shows control mode and drives by whole frame gradation data is prestored in chip to improve refresh rate, application scenario that can't the higher refresh rate of to meet the need but still there is room for promotion in its refresh rate, the problem that application is restricted.
The embodiment of the present invention is achieved in that a kind of frequency multiplication display control method, said method comprising the steps of:
Receive enable signal, search the frequency multiplication multiple corresponding with described enable signal;
According to described frequency multiplication multiple, and in the gray scale counter that prestores, high-positioned counter and low counter are divided other raw bits number, obtain the current figure place of described high-positioned counter and the current figure place of described low counter;
, according to the current figure place of described high-positioned counter and the current figure place of described low counter, control described gray scale counter and grayscale clock is counted and exported count value;
Receive gradation data, and according to the count value of described gradation data and described gray scale counter output, output is in order to drive the luminous pulse width modulating signal of display unit, so that within fixing display cycle, the demonstration number of times of each scan line increases corresponding described frequency multiplication multiple.
Another purpose of the embodiment of the present invention is to provide a kind of frequency multiplication display control program, and described system comprises:
The gray scale counter;
Search module, be used for receiving enable signal, search the frequency multiplication multiple corresponding with described enable signal;
Computing module, be used for according to described frequency multiplication multiple, and in the gray scale counter that prestores, high-positioned counter and low counter are divided other raw bits number, obtain the current figure place of described high-positioned counter and the current figure place of described low counter;
Control module, be used for according to the current figure place of described high-positioned counter and the current figure place of described low counter, controls described gray scale counter and grayscale clock is counted and exported count value;
The pulse-length modulation module, be used for receiving gradation data, and according to the count value of described gradation data and described gray scale counter output, output is in order to drive the luminous pulse width modulating signal of display unit, so that within fixing display cycle, the demonstration number of times of each scan line increases corresponding described frequency multiplication multiple.
Frequency multiplication display control method and system that the present invention proposes are utilized frequency doubling technology, figure place by high-positioned counter and low counter in adjustment gray scale counter, make within fixing display cycle, the demonstration number of times of each scan line increases corresponding frequency multiplication multiple, and then can make refresh rate increase corresponding frequency multiplication multiple, and the frequency multiplication multiple is larger, the multiple that refresh rate increases is more, thereby further promoted the refresh rate of dynamic scan screen, can make the occasion of the higher refresh rate of dynamic scan screen to meet the need, application is expanded.
Description of drawings
Fig. 1 is the demonstration control principle drawing of the LED dynamic scan screen that provides of prior art;
Fig. 2 be in prior art within fixing display cycle the display timing generator figure of each scan line;
Fig. 3 is the process flow diagram of the frequency multiplication display control method that provides of the embodiment of the present invention one;
Fig. 4 is the fixing display timing generator figure of each scan line in the display cycle in the embodiment of the present invention one;
Fig. 5 is the structural drawing of the frequency multiplication display control program that provides of the embodiment of the present invention two.
Embodiment
, in order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Problem for the prior art existence, the present invention proposes a kind of frequency multiplication display control method, the method is utilized frequency doubling technology, figure place by high-positioned counter and low counter in adjustment gray scale counter, make within fixing display cycle, the demonstration number of times of each scan line increases corresponding frequency multiplication multiple.Describe implementation of the present invention in detail below with reference to embodiment:
Embodiment one
The embodiment of the present invention one has proposed a kind of frequency multiplication display control method, as shown in Figure 3, comprising:
Step S1: receive enable signal, search the frequency multiplication multiple corresponding with enable signal.
In the embodiment of the present invention one, the default contingency table that characterizes corresponding relation between enable signal and frequency multiplication multiple, and according to the difference of selectable frequency multiplication multiple number, the figure place of enable signal also can differences,, by searching this contingency table, can obtain the frequency multiplication multiple corresponding with enable signal.For example, when enable signal was 2, if enable signal is 00, the frequency multiplication multiple can be 1, if enable signal is 01, the frequency multiplication multiple can be 2, if enable signal is 10, the frequency multiplication multiple can be 4, if enable signal is 11, the frequency multiplication multiple can be 8.
Step S2: according to the frequency multiplication multiple, and in the gray scale counter that prestores, high-positioned counter and low counter are divided other raw bits number, obtain the current figure place of high-positioned counter and the current figure place of low counter.
In the embodiment of the present invention one, the figure place of gray scale counter equals the figure place of high-positioned counter and the figure place sum of low counter, and when low counter count down to everybody and is " 0 ", high-positioned counter was counted once.
In the embodiment of the present invention one, original figure place refers to when not needing to carry out process of frequency multiplication the figure place of the figure place of high-positioned counter and low counter in the gray scale counter.The original figure place of supposing high-positioned counter is b, and the original figure place of low counter is a, and the frequency multiplication multiple is n, and n=2 is arranged
n'Wherein, n and n' are positive integer, and the current figure place of high-positioned counter is b', and the current figure place of low counter is a', step S2 is specially, according to frequency multiplication multiple n, and the original figure place a of the original figure place b of high-positioned counter and low counter, expression formula utilized: a'=a+n', b'=b-n', the current figure place that obtains high-positioned counter is that the current figure place of b' and low counter is a'.
For example, if frequency multiplication multiple n is 1, n' is 0, a'=a, b'=b; If frequency multiplication multiple n is 2, n' is 1, a'=a+1, b'=b-1; If frequency multiplication multiple n is 4, n' is 2, a'=a+2, b'=b-2; If frequency multiplication multiple n is 8, n' is 3, a'=a+3, b'=b-3.
Step S3:, according to the current figure place of high-positioned counter and the current figure place of low counter, control the gray scale counter and grayscale clock is counted and exported count value.
Step S4: receive gradation data, and according to the count value of gradation data and gray scale counter output, output is in order to drive the luminous pulse width modulating signal of display unit, so that within fixing display cycle, the demonstration number of times of each scan line increases corresponding frequency multiplication multiple, as shown in Figure 4.
In the embodiment of the present invention one, display unit is preferably the LED luminescence unit.
In the embodiment of the present invention one, suppose that the figure place of the count value of gray scale counter output is I, grayscale clock is T, and fixedly the display cycle is t, and the line number of scan line is m, and t=2 is arranged
I* T * m.Suppose after step S4, the demonstration number of times of each scan line is N', and N'=2 is arranged
a', and then obtain t/N'=2
b'* T * m, and the effective displaying time of each scan line in each procedure for displaying is by the dutycycle decision of gradation data representative.
The frequency multiplication display control method that the embodiment of the present invention one proposes utilizes frequency doubling technology,, by adjusting the figure place of high-positioned counter and low counter in the gray scale counter, makes within fixing display cycle the corresponding frequency multiplication multiple of demonstration number of times increase of each scan line.in conjunction with shown in Figure 2, for a m Mobile state scan screen, if the frequency doubling technology that does not adopt the embodiment of the present invention one to provide, in the prior art, at one fixedly in display cycle t, the demonstration number of times of each scan line is N, all scan line shows that the time once is t/N grayscale clock cycle, concrete procedure for displaying is: the first scan line shows for the first time in the cycle at t/N grayscale clock, after showing end, the second scan line shows for the first time in the cycle at t/N grayscale clock, by that analogy, until m scan line shows for the first time in the cycle at t/N grayscale clock, after all scan line is all completed and shown for the first time, according to the method described above, enter for the second time and show, until all m scan line all completed N demonstration.Because whole scan lines show that once the required time is t/N grayscale clock cycle, the refresh rate of this m dynamic scan screen is N/t.if and the frequency doubling technology that adopts the embodiment of the present invention one to provide, as shown in Figure 4, for a m dynamic scan screen, at one fixedly in display cycle t, the demonstration number of times of each scan line is N', all scan line shows that the time once is t/N' grayscale clock cycle, procedure for displaying is same as the prior art, the refresh rate of this m dynamic scan screen is N'/t, due to N'=n * N, can make refresh rate increase corresponding frequency multiplication multiple, and n is larger for the frequency multiplication multiple, the multiple that refresh rate increases is more, thereby further promoted the refresh rate of dynamic scan screen, can make the occasion of the higher refresh rate of dynamic scan screen to meet the need, application is expanded.
Embodiment two
The embodiment of the present invention two has proposed a kind of frequency multiplication display control program, as shown in Figure 5, for convenience of explanation, only shows the part relevant to the embodiment of the present invention two.
Specifically, the frequency multiplication display control program of the embodiment of the present invention two propositions comprises: gray scale counter 11; Search module 12, be used for receiving enable signal, search the frequency multiplication multiple corresponding with enable signal; Computing module 13, be used for according to the frequency multiplication multiple, and in the gray scale counter that prestores, high-positioned counter and low counter are divided other raw bits number, obtain the current figure place of high-positioned counter and the current figure place of low counter; Control module 14, be used for according to the current figure place of high-positioned counter and the current figure place of low counter, controls the gray scale counter and grayscale clock is counted and exported count value; Pulse-length modulation module 15, be used for receiving gradation data, and according to the count value of gradation data and gray scale counter output, output is in order to drive the luminous pulse width modulating signal of display unit, so that within fixing display cycle, the demonstration number of times of each scan line increases corresponding frequency multiplication multiple.Wherein, the detailed implementation of each module, as described in embodiment one, is not repeated herein.
Frequency multiplication display control method and system that the present invention proposes are utilized frequency doubling technology, figure place by high-positioned counter and low counter in adjustment gray scale counter, make within fixing display cycle, the demonstration number of times of each scan line increases corresponding frequency multiplication multiple, and then can make refresh rate increase corresponding frequency multiplication multiple, and the frequency multiplication multiple is larger, the multiple that refresh rate increases is more, thereby further promoted the refresh rate of dynamic scan screen, can make the occasion of the higher refresh rate of dynamic scan screen to meet the need, application is expanded.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is can control relevant hardware by program to complete, described program can be in being stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk, CD etc.
The foregoing is only preferred embodiment of the present invention,, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a frequency multiplication display control method, is characterized in that, said method comprising the steps of:
Receive enable signal, search the frequency multiplication multiple corresponding with described enable signal;
According to described frequency multiplication multiple, and in the gray scale counter that prestores, high-positioned counter and low counter are divided other raw bits number, obtain the current figure place of described high-positioned counter and the current figure place of described low counter;
, according to the current figure place of described high-positioned counter and the current figure place of described low counter, control described gray scale counter and grayscale clock is counted and exported count value;
Receive gradation data, and according to the count value of described gradation data and described gray scale counter output, output is in order to drive the luminous pulse width modulating signal of display unit, so that within fixing display cycle, the demonstration number of times of each scan line increases corresponding described frequency multiplication multiple.
2. frequency multiplication display control method as claimed in claim 1, is characterized in that, when described enable signal was 00, described frequency multiplication multiple was 1; When described enable signal was 01, described frequency multiplication multiple was 2; When described enable signal was 10, described frequency multiplication multiple was 4; When described enable signal was 11, described frequency multiplication multiple was 8.
3. frequency multiplication display control method as claimed in claim 1, is characterized in that, if the original figure place of described high-positioned counter is b, the original figure place of described low counter is a, and described frequency multiplication multiple is n, and n=2 is arranged
n'Described n and described n' are positive integer, the current figure place of described high-positioned counter is b', the current figure place of described low counter is a', described according to described frequency multiplication multiple, and in the gray scale counter that prestores, high-positioned counter and low counter are divided other raw bits number, and the step that obtains the current figure place of the current figure place of described high-positioned counter and described low counter is specially:
According to described frequency multiplication multiple n, and the original figure place a of the original figure place b of described high-positioned counter and described low counter, utilize expression formula: a'=a+n', b'=b-n', the current figure place that obtains described high-positioned counter is that the current figure place of b' and described low counter is a'.
4. frequency multiplication display control method as claimed in claim 1, it is characterized in that, if the figure place of the count value of described gray scale counter output is I, described grayscale clock is T, the described fixedly display cycle is t, and the line number of scan line is m, and the current figure place of described high-positioned counter is b', the demonstration number of times of described each scan line is N', and t=2 is arranged
I* T * m, and t/N'=2 is arranged
b'* T * m.
5. frequency multiplication display control method as described in claim 1 to 4 any one, is characterized in that, described display unit is the LED luminescence unit.
6. a frequency multiplication display control program, is characterized in that, described system comprises:
The gray scale counter;
Search module, be used for receiving enable signal, search the frequency multiplication multiple corresponding with described enable signal;
Computing module, be used for according to described frequency multiplication multiple, and in the gray scale counter that prestores, high-positioned counter and low counter are divided other raw bits number, obtain the current figure place of described high-positioned counter and the current figure place of described low counter;
Control module, be used for according to the current figure place of described high-positioned counter and the current figure place of described low counter, controls described gray scale counter and grayscale clock is counted and exported count value;
The pulse-length modulation module, be used for receiving gradation data, and according to the count value of described gradation data and described gray scale counter output, output is in order to drive the luminous pulse width modulating signal of display unit, so that within fixing display cycle, the demonstration number of times of each scan line increases corresponding described frequency multiplication multiple.
7. frequency multiplication display control program as claimed in claim 6, is characterized in that, when described enable signal was 00, described frequency multiplication multiple was 1; When described enable signal was 01, described frequency multiplication multiple was 2; When described enable signal was 10, described frequency multiplication multiple was 4; When described enable signal was 11, described frequency multiplication multiple was 8.
8. frequency multiplication display control program as claimed in claim 6, is characterized in that, if the original figure place of described high-positioned counter is b, the original figure place of described low counter is a, and described frequency multiplication multiple is n, and n=2 is arranged
n'Described n and described n' are positive integer, the current figure place of described high-positioned counter is b', the current figure place of described low counter is a', described computing module is according to described frequency multiplication multiple n, and the original figure place a of the original figure place b of described high-positioned counter and described low counter, utilizes expression formula: a'=a+n', b'=b-n', the current figure place that obtains described high-positioned counter is that the current figure place of b' and described low counter is a'.
9. frequency multiplication display control program as claimed in claim 6, it is characterized in that, if the figure place of the count value of described gray scale counter output is I, described grayscale clock is T, the described fixedly display cycle is t, and the line number of scan line is m, and the current figure place of described high-positioned counter is b', the demonstration number of times of described each scan line is N', and t=2 is arranged
I* T * m, and t/N'=2 is arranged
b'* T * m.
10. frequency multiplication display control program as described in claim 6 to 8 any one, is characterized in that, described display unit is the LED luminescence unit.
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