CN101944326B - LED display screen control chip and control method thereof - Google Patents
LED display screen control chip and control method thereof Download PDFInfo
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Abstract
The invention provides an LED display screen control chip, comprising a data acquisition circuit, a frame buffer I, a data conversion circuit, a frame buffer II, a scanning display circuit and a flowing water controller, wherein the flowing water controller is connected with a control end of the data acquisition circuit, an control end of the data conversion circuit and a control end of the scanning display circuit; the data input end of the data acquisition circuit is used for inputting RGB data; the data output end of the data acquisition circuit is connected with an input end of the frame buffer I; the output end of the frame buffer I is connected with the data input end of the data conversion circuit; the data output end of the data conversion circuit is connected with the input end of the frame buffer II; the output end of the frame buffer II is connected with the data input end of the scanning display circuit; and the data output end of the scanning display circuit is used for outputting the required data displayed on the LED display screen. In addition, the invention also provides a control method of the LED display screen control chip. The invention can realize a control system of the LED display screen, has simple structure, and can greatly reduce the cost. The invention further provides a control method of the LED display screen control chip.
Description
Technical field
The present invention relates to the LED display technique, relate in particular to a kind of LED display control technology that the LCD display parameter is converted into the LED display parameter.
Background technology
In recent years, flat panel display is constantly progressive, and wherein, standardization, the signal source of LCD communication interface are many, and its market mechanism is more ripe.And along with the improving constantly of the designing and manufacturing level of LED display technique, LED display gradually produce and life in use in a large number, LED display is with its distinctive display medium; In some applications; Show advantage especially like large tracts of land, round-the-clock, high brightness and super brightness display screen field, but also implicate out some defectives of LED display technique when widely applying, technology is prematurity still; Standard is not set up as yet fully, is not fit to the signal source of LED.Therefore need convert general LCD display source signal into the signal source that is fit to the LED display display interface in the practical application, have numerous LED display control device on the market, its control display performance and cost are also uneven.
At present the LCD display parameter are converted into the LED display display control program of LED display parameter; As shown in Figure 1; Comprise master controller and sub-controller; Master controller comprises DVI receiving chip, fpga chip 1, frame buffer 1, Low Voltage Differential Signal chip for driving wherein, and sub-controller comprises Low Voltage Differential Signal receiving chip, fpga chip 2, frame buffer 2:
The DVI receiving chip of said master controller receives outside DVI vision signal in real time, and offers fpga chip 1 after converting the DVI vision signal into the RGB data; Fpga chip 1 is according to the resolution requirements of LED screen; From the RGB data, gather required rgb signal; And will connect the rgb signal that collects and store frame buffer 1 into and accomplish up to a frame collection; Accomplish after the frame collection with the data of frame buffer 1 storage call in the FPGA1 chip carry out the conversion of RGB data, after reorganization the generation recombination data, recombination data offers the Low Voltage Differential Signal chip for driving; Said Low Voltage Differential Signal chip for driving produces differential data;
The differential data that the Low Voltage Differential Signal receiving chip low voltage differential signal receiving chip for driving of said sub-controller provides, and be reduced to recombination data, offer fpga chip 2; Fpga chip 2 receives and handles recombination data in real time, and the data storage after handling is finished dealing with up to a frame to frame buffer 2, after a frame is finished dealing with, the data of frame buffer 2 storages is called in the FPGA2 chip, and the FPGA2 chip produces and output LED sweep signal.
Aforesaid LED display display control program, the full-color screen that drives one 256 * 128 resolution need a master controller, sub-controller at least, comprise two fpga chips and two frame buffers, and hardware designs is complicated, and cost is higher.
Summary of the invention
The present invention is intended to solve the deficiency of prior art; A kind of efficient, high display quality, LED display display control chip cheaply are provided; This LED display control chip is applied to the LED display control system, can reduce hardware design complexity and hardware cost.
The LED display control chip; Comprise: data acquisition circuit, frame buffer one, data converting circuit, frame buffer two, scanning display circuit and flowing water controller; The control end of the control end of said flowing water controller connection data acquisition circuit, data converting circuit control end, scanning display circuit; The data input pin input RGB data of said data acquisition circuit; The data output end of data acquisition circuit connects the input end of frame buffer one, and the output terminal of said frame buffer one connects the data input pin of data converting circuit, and the data output end of said data converting circuit connects the input end of said frame buffer two; The output terminal of said frame buffer two connects the data input pin of scanning display circuit, and the data output end output LED display of said scanning display circuit shows required data.
The data input pin of said data acquisition circuit; Under the control of flowing water controller; Receive the LCD shows signal from the outside; Be the RGB data, read the view data of relevant position, under the control of flowing water controller, gather the data output end output of data that each frame data collects in real time through data acquisition circuit according to the demand of the resolution of LED display;
Said frame buffer one; Under the control of flowing water controller; Its input end receives the RGB data of the real-time output of data output end of data acquisition circuit; And red component, green component, blue component be stored in respectively in red component storage space, green component storage space and the blue component storage space in the frame buffer one; By the output terminal of frame buffer one, the RGB data of red component storage space, green component storage space, blue component storage space are pressed the output of data converting circuit demand then;
Said data converting circuit, under the control of flowing water controller, the RGB data of the output terminal of received frame buffer memory one output, under the 1/N scan pattern with H*V resolution under the RGB data carry out position power and change; Promptly read the every pixel of same row in the frame data, successively the RGB data of vertical every row are all carried out position power conversion, at last for being output as the 0th line data of weight 0, the 0th line data of weight 1 at a distance from N capable (1/N scanning); The 0th line data of weight 2, the 0th line data of weight 3, the 0th line data of weight 4, the 0th line data of weight 5; The 0th line data of weight 6, the 0th line data of weight 7, the 1st line data of weight 0, the 1st line data of weight 1; The 1st line data of weight 2, the 1st line data of weight 3, the 1st line data of weight 4, the 1st line data of weight 5; The 1st line data of weight 6, the 1st line data of weight 7 ..., the N line data of weight 0; The N line data of weight 1, the N line data of weight 2, the N line data of weight 3; The N line data of weight 4, the N line data of weight 5, the N line data of weight 6; The N line data of weight 7, each weight type comprises the N line data after the data-switching like this, and the data after the conversion are through the output terminal output of data converting circuit;
Said frame buffer two under the control of flowing water controller, receives the output of data converting circuit, and is stored in the frame buffer two, and the output terminal of frame buffer two is exported the data of its storage in real time;
Said scanning display circuit, under the control of flowing water controller, the translation data of received frame buffer memory two outputs is in real time exported after converting translation data into the LED video data.
The LED display control chip; Can also comprise correcting circuit; The output terminal of said frame buffer one no longer directly links to each other with the data input pin of change-over circuit, i.e. the output terminal of frame buffer one connects the data input pin of correcting circuit, and the data output end of said correcting circuit connects the data input pin of data converting circuit; Said correcting circuit reads the data of frame buffer one output in real time; Then, the data after the anti-Gamma of each frame of output that tables look-up proofreaies and correct, the data after anti-Gamma proofreaies and correct offer data converting circuit again.
A kind of control method of LED display control chip comprises the steps:
(1) data acquisition circuit receives the LCD shows signal, i.e. RGB data read the view data of relevant position according to the demand of the resolution of LED display, gather each frame data in real time;
(2) when data acquisition circuit collects the N+2 frame data, N is the integer more than or equal to 0, the N+2 frame data that frame buffer one receives and the storage data acquisition circuit collects, the one output N+1 frame data of frame buffer simultaneously;
(3) data converting circuit reads in the frame buffer one the N+1 frame data and carries out the conversion of data bit power;
(4) frame buffer two receives and stores the N+1 frame translation data after data converting circuit is changed, and the two output N frame translation data of frame buffer are simultaneously given and scanned display circuit;
(5) the scanning display circuit reads N frame translation data, and translation data is exported after as the LED video data.
The data converting circuit of said step (3) carries out can proofreading and correct earlier before the conversion of data bit power, and the data after the correction are carried out the conversion of data bit power again.
The LED display control chip that adopts the present invention to propose is realized simple in structure can the reducing cost greatly of LED display control system.
Description of drawings
Fig. 1 is traditional LED display display control program
The LED display control chip structural drawing that Fig. 2 proposes for the present invention
Fig. 3 is frame buffer one RGB storage space distribution schematic diagram among the present invention
Fig. 4 is the RGB data of the output terminal output of frame buffer one among the present invention
Fig. 5 is the position power translation data of data converting circuit conversion back output among the present invention
Fig. 6 is the LED display control chip structural drawing that comprises correcting circuit that the present invention proposes
Fig. 7 is the position power conversion synoptic diagram that comprises correcting circuit
Fig. 8 is a LED display control system of utilizing the present invention to realize
Fig. 9 is three grades of flowing water synoptic diagram of the control method of the LED display control chip that proposes of the present invention
Embodiment
Below in conjunction with accompanying drawing content of the present invention is further specified.
The LED display control chip; As shown in Figure 2; Comprise data acquisition circuit (21), frame buffer one (22), data converting circuit (24), frame buffer two (25), scanning display circuit (26) and flowing water controller (27); The control end of the control end of said flowing water controller (27) connection data acquisition circuit (21), data converting circuit (24) control end, scanning display circuit (26); The data input pin input RGB data of said data acquisition circuit (21), the data output end of data acquisition circuit (21) connects the input end of frame buffer one (22), and the output terminal of said frame buffer one (22) connects the data input pin of data converting circuit (24); The data output end of said data converting circuit (24) connects the input end of said frame buffer two (25), and the output terminal of said frame buffer two (25) connects the scanning display circuit.(26) data input pin, the data output end output LED display of said scanning display circuit (26) shows required data.
The data input pin of said data acquisition circuit (21) under the control of flowing water controller (27), receives the LCD shows signal from the outside; Be the RGB data, read the view data of relevant position, under the control of flowing water controller, gather each frame data in real time according to the demand of the resolution of LED display; In the present embodiment; The data of supposing every frame collection are: 512 pixel/OK, totally 256 is capable, and the data that collect are through the data output end output of data acquisition circuit (21);
Said frame buffer one (22); Under the control of flowing water controller; Its input end receives the RGB data of the real-time output of data output end of data acquisition circuit (21); And red component, green component, blue component be stored in respectively in red component storage space, green component storage space and the blue component storage space in the frame buffer one (22); The address assignment of storage space does, 0x0A0000 is 512 * 256 pixel red component storage spaces to 0x0B0000, and 0x0B0000 is 512 * 256 pixel green component storage spaces to 0x0C0000; 0x0C0000 is 512 * 256 pixel blue component storage spaces to 0x0D0000; As shown in Figure 3, by the output terminal of frame buffer one (22), RGB digital data change-over circuit (24) demand of red component storage space, green component storage space, blue component storage space is exported then;
Said data converting circuit (24), under the control of flowing water controller, the RGB data of the output terminal of received frame buffer memory one (22) output in the present embodiment, are supposed to adopt 1/8 scan pattern, read the every pixel at a distance from 8 row (1/8) of same row in the frame data shown in Figure 4, and suppose that each pixel is 8: the pixel like the 0th row is got Q (0,0) respectively, Q (8,0), Q (16,0), Q (24,0); Q (32,0), Q (40,0), Q (48,0), Q (56,0), Q (64,0), Q (72,0), Q (80,0); Q (88,0), Q (96,0), Q (104,0), Q (112,0), Q (120,0), Q (128,0), Q (136,0); Q (144,0), Q (152,0), Q (160,0), Q (168,0), Q (176,0), Q (184,0), Q (192,0); Q (200,0), Q (208,0), Q (216,0), Q (224,0), Q (232,0), Q (240,0), Q (248; 0), totally 32 data deposit in the register of data converting circuit (24), the 0th taking-up of 32 data are merged into one 32 bit data of the 0th row of a weight 0: { Q (248,0) 0Q (240,0) 0, Q (224,0) 0, Q (216,0) 0, Q (208,0) 0, Q (200,0) 0 again; Q (232,0) 0, Q (192,0) 0, Q (184,0) 0, Q (176,0) 0, Q (168,0) 0, Q (160,0) 0, Q (152; 0) 0, Q (144,0) 0, Q (136,0) 0, Q (128,0) 0, Q (120,0) 0, Q (112,0) 0, Q (104,0) 0; Q (96,0) 0, Q (88,0) 0, Q (80,0) 0, Q (72,0) 0, Q (64,0) 0, Q (56,0) 0, Q (48; 0) 0, Q (40,0) 0, Q (32,0) 0, Q (24,0) 0, Q (16,0) 0, Q (8,0) 0, Q (0,0) 0}; In like manner, the 1st taking-up of 32 data is merged into one 32 bit data of the 0th row of a weight 1: { Q (248,0) 1, Q (240,0) 1, Q (224,0) 1, Q (216,0) 1; Q (208,0) 1, Q (200,0) 1, Q (232,0) 1, Q (192,0) 1, Q (184; 0) 1, Q (176,0) 1, Q (168,0) 1, Q (160,0) 1, Q (152,0) 1; Q (144,0) 1, Q (136,0) 1, Q (128,0) 1, Q (120,0) 1, Q (112; 0) 1, Q (104,0) 1, Q (96,0) 1, Q (88,0) 1, Q (80,0) 1; Q (72,0) 1, Q (64,0) 1, Q (56,0) 1, Q (48,0) 1, Q (40; 0) 1, Q (32,0) 1, Q (24,0) 1, Q (16,0) 1, Q (8,0) 1; Q (0,0) 1}, the rest may be inferred, and 32 8 bit data are exported the 0th row of weight 0 successively through transposition, the 0th row of weight 1, the 0th row of weight 2, the 0th row of weight 3, the 0th row of weight 4; The 0th row of weight 5, the 0th row of weight 6, the 0th row of weight 7, the 1st row of weight 0, the 1st row of weight 1, the 1st row of weight 2 ..., the 1st row of weight 7, the 2nd row of weight 0;, the 2nd row of weight 7, the 3rd row of weight 0 ..., the 3rd row of weight 7, the 4th row of weight 0 ..., the 4th row of weight 7; The 5th row of weight 0 ..., the 5th row of weight 7, the 6th row of weight 0 ..., the 6th row of weight 7, the 7th row of weight 0 ... The 7th row of weight 7, vertical the 0th row are all changed to the data of every pixel of 8 pixels of the 511st row, and each weight type comprises 8 line data like this, and every row comprises 512 32 horizontal data, and is as shown in Figure 5, the position flexible strategy certificate of pixel number according to synthetic one 32 of the data of identical bits, accomplished 8 bit width pixel numbers according to the conversion to 32 bit width position flexible strategy certificates, and the data after the conversion are exported through the output terminal of data converting circuit (24);
Said frame buffer two (25) under the control of flowing water controller, receives the output of data converting circuit (24), and is stored in the frame buffer two (25), and the output terminal of frame buffer two is exported the data of its storage in real time;
Said scanning display circuit (26), under the control of flowing water controller, the translation data of received frame buffer memory two (25) outputs in real time converts translation data the output of into LED video data DATE [31:0] back.
The LED display control chip can also comprise correcting circuit (23), and is as shown in Figure 6; The output terminal of said frame buffer one (22) no longer directly links to each other with the data input pin (24) of change-over circuit; Be the data input pin of the output terminal connection correcting circuit (23) of frame buffer one (22), the data output end of said correcting circuit (23) connects the data input pin (24) of data converting circuit, and said correcting circuit (23) reads the data of frame buffer one (22) output in real time; Data with 8 red components, green component or blue components are the address then; Table look-up and export the anti-Gamma correction data of each frame (1024 grades), the data after anti-Gamma proofreaies and correct offer data converting circuit again, and said anti-Gamma correction data can be 8-16; Anti-Gamma table of corrections is calculated by anti-Gamma updating formula and generates, and formula is Y=(x/256)
γ* 1024, Y is the output data bit wide in the formula, and x is the input data bit width, and γ is a correction coefficient, and γ is 2.8 in the present embodiment.The figure place of the data after anti-Gamma proofreaies and correct not simultaneously, the weight number of data converting circuit output is different, in the time of can being 10 like the data after anti-Gamma proofreaies and correct, the weight number that data converting circuit is exported is 10, and is as shown in Figure 7.
Utilize LED display control system like Fig. 2 or Fig. 6 LED display control chip formation; As shown in Figure 8, comprise the DVI receiving chip, the LED display control chip; Frame buffer three; Said DVI receiving chip receives outside DVI vision signal in real time, and offers Fig. 2 or the described LED display control chip of Fig. 6 after converting the DVI vision signal into the RGB data, said the RGB data are handled after with data storage in frame buffer three and export the LED sweep signal.Can find out that with Fig. 8 LED display control system shown in Figure 8 is simple in structure through comparison diagram 1, only need a LED display control chip, can reduce cost greatly, and hardware designs be simple.
The control method of LED display control chip as shown in Figure 2 comprises the steps:
(1) data acquisition circuit receives the LCD shows signal, i.e. RGB data read the view data of relevant position according to the demand of the resolution of LED display, gather each frame data in real time;
(2) when data acquisition circuit collects the N+2 frame data, N is the integer more than or equal to 0, the N+2 frame data that frame buffer one receives and the storage data acquisition circuit collects, the one output N+1 frame data of frame buffer simultaneously;
(3) data converting circuit reads that the N+1 frame data carry out data-switching in the frame buffer one;
(4) frame buffer two receives and stores the N+1 frame translation data after data converting circuit is changed, and the two output N frame translation data of frame buffer are simultaneously given and scanned display circuit;
(5) the scanning display circuit reads N frame translation data, and translation data is exported after as the LED video data.
The control method of LED display control chip as shown in Figure 6 comprises the steps:
(1) data acquisition circuit receives the LCD shows signal, i.e. RGB data read the view data of relevant position according to the demand of the resolution of LED display, gather each frame data in real time;
(2) when data acquisition circuit collects the N+2 frame data, N is the integer more than or equal to 0, the N+2 frame data that frame buffer one receives and the storage data acquisition circuit collects, the one output N+1 frame data of frame buffer simultaneously;
(3) N+1 frame data are proofreaied and correct through correcting circuit;
(4) data after data converting circuit reads correcting circuit and proofreaies and correct are carried out data-switching;
(5) frame buffer two receives and stores the N+1 frame translation data after data converting circuit is changed, and the two output N frame translation data of frame buffer are simultaneously given and scanned display circuit;
(6) the scanning display circuit reads N frame translation data, and translation data is exported through the data output end of scanning display circuit as the LED video data.
What should be understood that is, the foregoing description is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within the protection domain of the present invention.
Claims (5)
1.LED display screen control chip; It is characterized in that comprising: data acquisition circuit, frame buffer one, data converting circuit, frame buffer two, scanning display circuit and flowing water controller; The control end of the control end of said flowing water controller connection data acquisition circuit, data converting circuit control end, scanning display circuit; The data input pin input RGB data of said data acquisition circuit; The data output end of data acquisition circuit connects the input end of frame buffer one, and the output terminal of said frame buffer one connects the data input pin of data converting circuit, and the data output end of said data converting circuit connects the input end of said frame buffer two; The output terminal of said frame buffer two connects the data input pin of scanning display circuit, and the data output end output LED display of said scanning display circuit shows required data.
2. LED display control chip according to claim 1 is characterized in that:
The data input pin of said data acquisition circuit; Under the control of flowing water controller; Receive the LCD shows signal from the outside; Be the RGB data, read the view data of relevant position, under the control of flowing water controller, gather the data output end output of data that each frame data collects in real time through data acquisition circuit according to the demand of the resolution of LED display;
Said frame buffer one; Under the control of flowing water controller; Its input end receives the RGB data of the real-time output of data output end of data acquisition circuit; And red component, green component, blue component be stored in respectively in red component storage space, green component storage space and the blue component storage space in the frame buffer one; By the output terminal of frame buffer one, the RGB data of red component storage space, green component storage space, blue component storage space are pressed the output of data converting circuit demand then;
Said data converting circuit, under the control of flowing water controller, the RGB data of the output terminal of received frame buffer memory one output, under the 1/N scan pattern with H*V resolution under the RGB data carry out position power and change; Promptly read the every pixel of same row in the frame data, successively the RGB data of vertical every row are all carried out position power conversion, be output as the 0th line data of weight 0, the 0th line data of weight 1 at a distance from N capable (1/N scanning); The 0th line data of weight 2, the 0th line data of weight 3, the 0th line data of weight 4, the 0th line data of weight 5; The 0th line data of weight 6, the 0th line data of weight 7, the 1st line data of weight 0, the 1st line data of weight 1; The 1st line data of weight 2, the 1st line data of weight 3, the 1st line data of weight 4, the 1st line data of weight 5; The 1st line data of weight 6, the 1st line data of weight 7 ..., the N line data of weight 0; The N line data of weight 1, the N line data of weight 2, the N line data of weight 3; The N line data of weight 4, the N line data of weight 5, the N line data of weight 6; The N line data of weight 7, each weight type comprises the N line data after the data-switching like this, and the data after the conversion are through the output terminal output of data converting circuit;
Said frame buffer two under the control of flowing water controller, receives the output of data converting circuit, and is stored in the frame buffer two, and the output terminal of frame buffer two is exported the data of its storage in real time;
Said scanning display circuit, under the control of flowing water controller, the translation data of received frame buffer memory two outputs is in real time exported after converting translation data into the LED video data.
3. LED display control chip according to claim 1; It is characterized in that to comprise correcting circuit; The output terminal of said frame buffer one no longer directly links to each other with the data input pin of change-over circuit, i.e. the output terminal of frame buffer one connects the data input pin of correcting circuit, and the data output end of said correcting circuit connects the data input pin of data converting circuit; Said correcting circuit reads the data of frame buffer one output in real time; Then, the data after the anti-Gamma of each frame of output that tables look-up proofreaies and correct, the data after anti-Gamma proofreaies and correct offer data converting circuit again.
4.LED the control method of display screen control chip is characterized in that comprising the steps:
(1) data acquisition circuit receives the LCD shows signal, i.e. RGB data read the view data of relevant position according to the demand of the resolution of LED display, gather each frame data in real time;
(2) when data acquisition circuit collects the N+2 frame data, N is the integer more than or equal to 0, the N+2 frame data that frame buffer one receives and the storage data acquisition circuit collects, the one output N+1 frame data of frame buffer simultaneously;
(3) data converting circuit reads in the frame buffer one the N+1 frame data and carries out the conversion of data bit power;
(4) frame buffer two receives and stores the N+1 frame translation data after data converting circuit is changed, and the two output N frame translation data of frame buffer are simultaneously given and scanned display circuit;
(5) the scanning display circuit reads N frame translation data, and translation data is exported after as the LED video data.
5. like the control method of the said LED display control chip of claim 4, it is characterized in that the data converting circuit of said step (3) carries out can proofreading and correct earlier before the conversion of data bit power, the data after the correction are carried out the conversion of data bit power again.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3220590B2 (en) * | 1993-04-08 | 2001-10-22 | コニカ株式会社 | Coating device |
| CN1671180A (en) * | 2004-03-17 | 2005-09-21 | 上海三思科技发展有限公司 | A video processor for LED full-color display screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3220590B2 (en) * | 1993-04-08 | 2001-10-22 | コニカ株式会社 | Coating device |
| CN1671180A (en) * | 2004-03-17 | 2005-09-21 | 上海三思科技发展有限公司 | A video processor for LED full-color display screen |
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