CN102148010A - Display control system and method for gray scale of color LED (light-emitting diode) based on on-chip RAM (random access memory) - Google Patents
Display control system and method for gray scale of color LED (light-emitting diode) based on on-chip RAM (random access memory) Download PDFInfo
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- CN102148010A CN102148010A CN2011101055239A CN201110105523A CN102148010A CN 102148010 A CN102148010 A CN 102148010A CN 2011101055239 A CN2011101055239 A CN 2011101055239A CN 201110105523 A CN201110105523 A CN 201110105523A CN 102148010 A CN102148010 A CN 102148010A
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Abstract
The invention discloses a display control system and a method for gray scale of a color LED (light-emitting diode) based on an on-chip RAM (random access memory). The invention realizes the function of video play on an LED display screen through operations of bit plane separation, RAM reading and writing, zone control and the like to 24-bit color RGB (red, green and blue) video source signals. A hardware design structure of the system comprises a control signal generating module, a bit plane separating module, an RAM control module and a zoning module, wherein the RAM control module comprises a field RAM read-write module, an RAM storage control module and a zone RAM read-write module. The invention provides a display control method of a color LED display screen for intrinsic gray scale control, and the method only occupies the on-chip storage space and saves the external hardware resources.
Description
Technical field
The present invention relates to the method that a kind of color LED gray scale shows control, be specifically related to a kind ofly show the method for control, require and the function of data gray-scale Control with the data presentation that meets the color LED display based on the gray scale of ram in slice.
Background technology
Characteristics such as LED display has that the visual angle is big, the life-span long, bright in luster, energy-conserving and environment-protective have become the important means of present information publication medium, have obtained widespread use in fields such as security exchange, finance, traffic, physical culture, advertisements.The LED display control module is the core technology of LED display, solves video source signal high image quality, correct problem that shows on LED display of multi-format.LED display mainly is divided into two kinds of built-in gray-scale Control (Scramble-PWM) and non-built-in gray-scale Control (PWM) in the market, and the controller partial design of built-in gray-scale Control LED display is simple, and the screen body portion has comprised gray-scale Control; Non-built-in gray-scale Control LED display body does not comprise gray-scale Control, and its gray-scale Control is finished by led controller.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of color LED gray scale display control method based on ram in slice is provided, this method is at non-built-in gray-scale Control color LED display screen, can utilize ram in slice to produce to meet this type of LED screen body video data form, by to different the sweep time and the controlling Design of read-write number of times, the rgb video source is converted to the control that data layout that LED display supports is realized gray scale.
The objective of the invention is to solve by the following technical programs:
This color LED gray scale display control program based on ram in slice comprises control signal generating module, plane separation module, RAM control module and division module; Wherein said RAM control module comprises a RAM module for reading and writing, RAM storage control module and district RAM module for reading and writing; Described control signal generating module is connected with described plane separation module, RAM control module, is used to produce the various signals of control entire display screen; The data of described RAM control module output are connected to division module with district's enable signal; The output terminal of the field RAM module for reading and writing in the described RAM control module is connected with the input end of RAM storage control module, the output terminal of described RAM storage control module is connected with district RAM module for reading and writing, the output terminal of described district RAM module for reading and writing is connected to the input end of division module, and the output terminal of described division module is connected on the LED display by winding displacement and selects signal to cooperate the display video that makes that LED display is correct and smooth jointly with the gray scale of described control signal generating module output with row.
The present invention also proposes a kind of control method of the color LED gray scale display control program based on above-mentioned ram in slice, be specially: make described RAM module for reading and writing and district RAM module for reading and writing all comprise a plurality of RAM as temporary, corresponding field of storage and the different data of distinguishing, and because the clock of the operating clock of the clock of video source, RAM and LED display different, adopt the operation of cross clock domain, promptly want dual port RAM to cushion, read and write control by judgement to the degree of depth; Comprise 16 RAM in the described RAM storage control module as field memory, these field memories are divided into two parts, as each of video source of storage different frame with the power and position data, according to 19 field scan principle requirements, time for reading and reading times to different fields are controlled, and make it meet the display requirement and the gray-scale Control of LED screen.
Above-mentioned cross clock domain is the degree of depth to be changed judge the full state of sky of corresponding RAM to be realized by the counting that read-write is enabled.
Above-mentioned 19 field scan principles are: from a byte data successively from low level to high-order or from a high position to the low level, extract the one digit number certificate, divide and light corresponding pixel for 8 times, the time of lighting of each correspondence is different with the dutycycle of turn-off time, the time of lighting of definition Do position correspondence adds that the turn-off time is a chronomere, be made as T, can get everybody lighting and the turn-off time, T carries out a serial data to LED display to upgrade the needed time, make shared T.T. of each data bit carry out timing by refreshing an on-screen data, when carrying out the LED display design, the light on and off of LED is by master control line EN control in the entire display screen, when time of lighting 〉=1T, the EN control display screen is in normal bright state, and when time of lighting＜1T, the control waveform that produces corresponding dutycycle by control EN is realized the brilliance control of corresponding positions.
On LED display, the data in each district should show simultaneously that division module 4 is exactly in order to realize this purpose.
Above-mentioned RAM module for reading and writing comprises three parts, is respectively a RAM writing module, a RAM group and a RAM read through model; Described RAM writing module stores the data that obtain from the plane separation module respectively among the different field RAM by the field, a RAM read through model then from different field RAM reading corresponding data give and carry out storage operation in the RAM storage control module.
Above-mentioned district RAM module for reading and writing comprises three parts, is respectively district RAM writing module, district RAM group and district RAM read through model; RAM writing module in described district stores the data that obtain from the RAM storage control module respectively among the different district RAM by the district, district RAM read through model then from different district RAM reading corresponding data give the demonstration of operating in the division module for LED display.
The present invention has following beneficial effect:
(1) the present invention only adopts and the storage resources in the sheet is carried out programming in logic has realized external storage resources has been saved in 24 demonstrations of rgb video source on LED display greatly, has reduced hardware cost.
(2) the present invention is by analyzing 24 rgb video source signals and the required format of display data of big screen LED display screen, storage space in the reasonable distribution sheet and read-write control strategy, the conversion that can realize utilizing the ram in slice storage resources to finish the video source form and the gray-scale Control of color LED display screen.
Description of drawings
Fig. 1 is a system chart of the present invention;
Fig. 2 is the structural drawing of Fig. 1 midfield RAM module for reading and writing 5;
Fig. 3 is the structural drawing of district RAM module for reading and writing 7 among Fig. 1;
Fig. 4 is the synoptic diagram that red data separates with power and position in the video source data.
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Fig. 1 is the system chart of the color LED gray scale display control program based on ram in slice of the present invention.This system comprises plane separation module 1, control signal generating module 2, RAM control module 3 and division module 4, wherein RAM control module 3 comprises a RAM module for reading and writing 5, RAM storage control module 6 and district RAM module for reading and writing 7, control signal generating module 2 is connected with plane separation module 1, RAM control module 3, is used to produce the various signals of control entire display screen; The data of RAM control module 3 outputs are connected to division module 4 with district's enable signal; The output terminal of the field RAM module for reading and writing 5 in the RAM control module 3 is connected with the input end of RAM storage control module 6, the output terminal of RAM storage control module 6 is connected with district RAM module for reading and writing 7, the output terminal of district RAM module for reading and writing 7 is connected to the input end of division module 4, and the output terminal of division module 4 is connected on the LED display by winding displacement.
The present invention at work by control signal generating module 2 by row, field signal and the clock signal of input by carrying out suitable operation and produce row, field, the gray scale of output and go signal such as choosing to moderate, and its control signal is flowed to plane separation module 1 and RAM control module 3 respectively.For color data is driven the LED screen by weights, must obtain the bit position separate storage of different weights in the pixel data of each, plane separation module 1 is exactly in order to realize this purpose.Because the clock of video source is different with the frequency of the operating clock of RAM, so the data of each after handling through plane separation module 1 need to cushion through the dual port RAM of similar number before entering RAM storage control module 6 again, the cross clock domain here is to solve by the full state of sky that the counting that its read-write is enabled changes its degree of depth to judge corresponding RAM.The data of RAM module for reading and writing 5 outputs enter deposit in respectively in the RAM storage control module 6 different corresponding frames with corresponding in, and read accordingly according to scan control time of 19 field scan principles data to different. because the frequency of the operating clock of RAM and the clock of LED display is different, before the data by 6 outputs of RAM memory module are entering division module 4, need to cushion by the identical dual port RAM of number wherein and district LED display through district RAM module for reading and writing 7.The cross clock domain here is to realize by the full state of sky that the counting that its read-write is enabled changes its degree of depth to judge corresponding RAM.On LED display, the data in each district should show simultaneously that division module 4 is exactly in order to realize this purpose.The output of last division module is connected on the LED display by winding displacement selects signal to cooperate the display video that makes that LED display is correct and smooth jointly with the gray scale of control signal generating module 2 outputs with row.
As Fig. 2, a RAM module for reading and writing 5 comprises three parts, is respectively a RAM writing module, a RAM group, a RAM read through model.RAM writing module stores the data that obtain from plane separation module 1 respectively among the different field RAM by the field, a RAM read through model then from different field RAM reading corresponding data give and carry out storage operation in the RAM storage control module 6.
As Fig. 3, district RAM module for reading and writing 7 also comprises three parts, is respectively district RAM writing module, district RAM group, district RAM read through model.District's RAM writing module stores the data that obtain from RAM storage control module 6 respectively among the different district RAM by the district, district RAM read through model then from different district RAM reading corresponding data give the demonstration of operating in the division module 4 for LED display.
As Fig. 4, structure and drive principle according to LED display, LED display needs the different weights of color data are operated, so must separate different weights in the pixel, be depicted as the process that 88 data are operated among the figure for example, 8 data that enter plane separation module 1 are successively carried out arrangement as figure, recombinate for the 0th with each data in 8 data, obtain new data, send into RAM control module 3, other data are in like manner operated.
Described " 19 field scan " theory, promptly from a byte data successively from low level to high-order or from a high position to the low level, extract the one digit number certificate, divides the pixel of lighting correspondence for 8 times, the time of lighting of each correspondence is different with the dutycycle of turn-off time.The time of lighting of definition Do position correspondence adds that the turn-off time is a chronomere, is made as T, can table 1 shown in everybody light and the turn-off time.T carries out a serial data to LED display to upgrade the needed time.T.T. shown in the table 1 is the integral multiple of T, so shared T.T. of each data bit can be carried out timing by refreshing an on-screen data.When carrying out the LED display design, the light on and off of LED can be by master control line EN control in the entire display screen, when time of lighting 〉=1T, the EN control display screen is in normal bright state, and when time of lighting＜1T, can realize the brilliance control of corresponding positions by the control waveform that control EN produces corresponding dutycycle.
Each data bit scan control time of table 1
Claims (7)
1. the color LED gray scale display control program based on ram in slice is characterized in that: comprise control signal generating module (2), plane separation module (1), RAM control module (3) and division module (4); Wherein said RAM control module (3) comprises a RAM module for reading and writing (5), RAM storage control module (6) and district's RAM module for reading and writing (7); Described control signal generating module (2) is connected with described plane separation module (1), RAM control module (3), is used to produce the various signals of control entire display screen; The data of described RAM control module (3) output are connected to division module (4) with district's enable signal; The output terminal of the field RAM module for reading and writing (5) in the described RAM control module (3) is connected with the input end of RAM storage control module (6), the output terminal of described RAM storage control module (6) is connected with district's RAM module for reading and writing (7), the output terminal of described district's RAM module for reading and writing (7) is connected to the input end of division module (4), and the output terminal of described division module (4) is connected on the LED display by winding displacement and selects signal to cooperate the display video that makes that LED display is correct and smooth jointly with the gray scale of described control signal generating module (2) output with row.
2. control method based on the color LED gray scale display control program of the described ram in slice of claim 1, it is characterized in that: make described RAM module for reading and writing (5) and district's RAM module for reading and writing (7) all comprise a plurality of RAM as temporary, corresponding field of storage and the data of distinguishing, and because the operating clock of the clock of video source, RAM adopts the operation of cross clock domain, promptly want dual port RAM to cushion, read and write control by judgement to the degree of depth; Comprise 16 RAM in the described RAM storage control module (6) as field memory, these field memories are divided into two parts, as each of video source of storage different frame with the power and position data, according to 19 field scan principle requirements, time for reading and reading times to different fields are controlled, and make it meet the display requirement and the gray-scale Control of LED screen.
3. according to right 2 described control methods, it is characterized in that: described cross clock domain is the degree of depth to be changed judge the full state of sky of corresponding RAM to be realized by the counting that read-write is enabled.
4. according to right 2 described control methods, it is characterized in that, described 19 field scan principles are: from a byte data successively from low level to high-order or from a high position to the low level, extract the one digit number certificate, divide and light corresponding pixel for 8 times, the time of lighting of each correspondence is different with the dutycycle of turn-off time, the time of lighting of definition Do position correspondence adds that the turn-off time is a chronomere, be made as T, can get everybody lighting and the turn-off time, T carries out a serial data to LED display to upgrade the needed time, make shared T.T. of each data bit carry out timing by refreshing an on-screen data, when carrying out the LED display design, the light on and off of LED is by master control line EN control in the entire display screen, when time of lighting 〉=1T, the EN control display screen is in normal bright state, and when time of lighting＜1T, and the control waveform that produces corresponding dutycycle by control EN is realized the brilliance control of corresponding positions.
5. according to right 2 described control methods, it is characterized in that on LED display, the data in each district show simultaneously.
6. according to right 2 described control methods, it is characterized in that: described RAM module for reading and writing (5) comprises three parts, is respectively a RAM writing module, a RAM group and a RAM read through model; Described RAM writing module will store into respectively among the different field RAM by the field from the data that obtain the plane separation module (1), a RAM read through model then from different field RAM reading corresponding data give in the RAM storage control module (6) and carry out storage operation.
7. according to right 2 described control methods, it is characterized in that: described district RAM module for reading and writing (7) comprises three parts, is respectively district RAM writing module, district RAM group and district RAM read through model; Described district RAM writing module will store into respectively among the different district RAM by the district from the data that obtain the RAM storage control module (6), district's RAM read through model then from different district RAM reading corresponding data give the demonstration of operating in the division module (4) for LED display.
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Application publication date: 20110810 |