CN101211549A - Data-transmission method applies to asynchronous display and related electronic system - Google Patents
Data-transmission method applies to asynchronous display and related electronic system Download PDFInfo
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- CN101211549A CN101211549A CNA200610172121XA CN200610172121A CN101211549A CN 101211549 A CN101211549 A CN 101211549A CN A200610172121X A CNA200610172121X A CN A200610172121XA CN 200610172121 A CN200610172121 A CN 200610172121A CN 101211549 A CN101211549 A CN 101211549A
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Abstract
The invention relates to an electronic system, which comprises a display device, a micro processing unit and a display driver. The display device controls the operation of the electronic system. The display driver drives the display device according to the control of the micro processing unit. The micro processing unit is connected with the display driver by a mode selecting line, a reference clock line and a data transmitting line integration mutually. The micro processing unit signals the display driver a current transmitting mode by the mode selecting line, and the reference clock is transmitted to the display driver by the reference clock line. The micro processing unit and the display driver synchronize the data transmitted to the data transmitting line integration according to the reference clock.
Description
Technical field
The present invention is relevant to asynchronous demonstration, refers to a kind of asynchronous data presented transmission method and relevant electronic system of being applied to especially.
Background technology
According to applied mode, generally display device can be divided into synchronous display apparatus and this two kind of asynchronous display device.For synchronous display apparatus, its display driver must receive the view data with fixed image renewal frequency, to drive synchronous display apparatus according to this, for instance, when the frame updating frequency is 60Hz, no matter desire the picture displayed content no change is arranged, the display driver per second of synchronous display apparatus all must receive the data of 60 pictures, calculator display organization, liquid crystal indicator TV (LDC TV) ... the display device of this class all belongs to synchronous display apparatus.Relatively, for asynchronous display device, its display driver is not the work of carrying out driving according to the view data with fixed image renewal frequency, for instance, when desire picture displayed content remains unchanged, the display driver of asynchronous display device can directly be carried out the work of driving according to stored data in its memory cell, and need not receive the picture data of repetition, only when desire picture displayed content changes, the display driver of asynchronous display device just need receive new picture data, and drives asynchronous display device according to this and upgrade its shown picture.Be arranged at MP3 player, printer, digital photo frame ... in display device all can asynchronous at last display device.
For the electronic system that includes asynchronous display device, (MicroProcessing Unit MPU) generally is the transmission interface of being dependent between the display driver that existing data transmission interface (for example universal input/output interface (GPIO)) is used as itself and asynchronous display device to microprocessing unit wherein.Yet; this type of known data transmission interface all has the slower shortcoming of transmission speed; the frequency range of usefulness that therefore can offer image data transmission is normally limited; in addition; this type of known data transmission interface all has the complicated characteristic of interface; so regular meeting takies microprocessing unit I/O pin quite a lot (I/O pin); for the integrated microprocessing unit of multiple function; the quantity of the I/O pin that it can provide is normally limited, and the I/O pin that may not be certain to provide enough is used as the usefulness of asynchronous image data transmission.
Summary of the invention
One of purpose of the present invention is to provide a kind of asynchronous data presented transmission method and relevant electronic system of being applied to.
Embodiments of the invention disclose a kind of electronic system, and it includes display device, microprocessing unit and display driver.This microprocessing unit is used for controlling the running of this electronic system; This display driver is used for driving this display device according to the control of this microprocessing unit.Be to interconnect between this microprocessing unit and this display driver by model selection line, reference clock line and data line set, this microprocessing unit is informed this display driver one existing transmission mode by this model selection line, and pass through this reference clock line and transmit reference clock to this display driver, this microprocessing unit and this display driver come synchronization to be transmitted in the data that this data line is gathered according to this reference clock.
Embodiments of the invention also disclose a kind of data transmission method, are used for carrying out communication for microprocessing unit and display driver, and this display driver is used for according to the controlling and driving display device of this microprocessing unit.This method includes: this microprocessing unit is informed this display driver one existing transmission mode; This microprocessing unit transmits reference clock to this display driver; And this microprocessing unit and this display driver use this reference clock to carry out communication as synchronous foundation.
Description of drawings
Fig. 1 is an embodiment synoptic diagram of electronic system of the present invention.
Fig. 2 is an example of the sequential chart of the signal that transmitted between the microprocessing unit of Fig. 1 under the working storage access mode and display driver.
Fig. 3 and Fig. 4 are two examples of the sequential chart of the signal that transmitted between the microprocessing unit of Fig. 1 under the data-transmission mode and display driver.
[main element label declaration]
100 electronic systems
120 microprocessing units
131 model selection lines
132 reference clock lines
The set of 133 data lines
140 display drivers
141 control modules
142 working storage unit
143 memory cells
144 output units
160 display device
Embodiment
Figure 1 shows that an embodiment synoptic diagram of electronic system of the present invention.The electronic system 100 of present embodiment includes microprocessing unit 120, display driver 140 and display device 160.Microprocessing unit 120 is used for controlling the running of electronic system 100 integral body, and display driver 140 is used for driving display device 160 according to the control of microprocessing unit 120.Display driver 140 includes control module 141, working storage unit 142, memory cell 143 and output unit 144, wherein, control module 141 is used for controlling the running of display driver 140, working storage unit 142 is used for storing the running setting value of display driver 140, and memory cell 143 is used for storing the picture data that output unit 144 drives display device 160 according to this.Because in electronic system 100, display device 160 is to be used as asynchronous display device to use, so display driver 140 need not continue to receive the view data with fixed image renewal frequency from microprocessing unit 120.
In the present embodiment, be to interconnect between microprocessing unit 120 and the display driver 140 by model selection line 131, reference clock line 132 and data line set 133, wherein, data line set 133 can include one or more data line.Reference clock line 132 allows that microprocessing unit 120 transmits reference clock RCK to display driver 140, allows microprocessing unit 120 and display driver 140 can use the foundation of reference clock RCK as synchronous transmission.Model selection line 131 allows that microprocessing unit 120 transfer modes selection signal MS is to display driver 140, why to inform display driver 140 1 existing transmission modes.For instance, when microprocessing unit 120 mode select signal MS are set to first state (for example low-potential state), represent that this existing transmission mode is the working storage access mode, this moment, microprocessing unit 120 can be gathered one or more data line in 133 by data line, controlled 140 pairs of working storage unit of display driver 142 and carried out access; When the state of microprocessing unit 120 model selection lines 131 is set to second state (for example high potential state), represent that this existing transmission mode is a data-transmission mode, this moment, microprocessing unit 120 can be gathered one or more data line in 133 by data line, controlled 140 pairs of memory cells of display driver 143 and carried out access.
Fig. 2 is an example at the sequential chart of the signal that is transmitted between microprocessing unit 120 and the display driver 140 under this working storage access mode.In this example, only use that single data line comes transmission of data signals DA in the data line set 133, and the C0～Cm in the data-signal DA is a command code, I0～In is target working storage address, D0～Dp then is a setting value, for the signal of 16 bit patterns, aforesaid m, n and p can equal 1,5 and 7 respectively.When C0～Cm corresponding to writing when instruction, D0～Dp is the setting value that microprocessing unit 120 is sent to display driver 140, among the working storage address that this moment, display driver 140 can be pointed with I0～In in D0～Dp write registers unit 142; As C0～Cm during corresponding to reading command, display driver 140 can read setting value D0～Dp in the working storage addresses in I0～In working storage pointed unit 142, and by data-signal DA setting value D0～Dp is sent to microprocessing unit 120.Please note, though in this example, only use that single data line comes transmission of data signals DA in the data line set 133, yet, if desire increases the data rate under this working storage access mode, can also use in the data line set 133 many data lines to transmit a plurality of data-signals (sum of the sum of the employed data line data line that must gather in 133 to be comprised smaller or equal to data line certainly) simultaneously.
Fig. 3 is an example of the sequential chart of the signal that transmitted between microprocessing unit 120 under this data-transmission mode and display driver 140.In this example, be only to use that single data line comes transmission of data signals DA in the data line set 133, and data-signal DA can include microprocessing unit 120 desires and allows display driver 140 write to the data of memory cell 143 or the data that microprocessing unit 120 control display drivers 140 are read in memory cell 143.Send by data-signal DA after consecutive access (burst accessing) instruction and mode select signal MS be set to this second state when microprocessing unit 120, microprocessing unit 120 can transmit pixel data by data-signal DA continuously and in large quantities with display driver 140.With display device 160 is that the situation of 6 plane plates is an example, every 18 clock period through reference clock RCK, can transmit a pixel by data-signal DA.
Fig. 4 is another example of the sequential chart of the signal that transmitted between microprocessing unit 120 under this data-transmission mode and display driver 140.In this example, be to use that three data lines come transmission of data signals DA1, DA2 and DA3 in the data line set 133, and data-signal DA1～DA3 can include microprocessing unit 120 desires and allows display driver 140 write to the data of memory cell 143 or the data that microprocessing unit 120 control display drivers 140 are read in memory cell 143.Send by data-signal DA1～DA3 after consecutive access instruction and mode select signal MS be set to this second state when microprocessing unit 120, microprocessing unit 120 can transmit pixel data by data-signal DA1～DA3 continuously and in large quantities with display driver 140.With display device 160 is that the situation of 6 plane plates is an example, every 6 clock period through reference clock RCK, can transmit a pixel by data-signal DA1～DA3.
The advantage of above embodiment is, its employed asynchronous demonstration transmission interface (including model selection line 131, reference clock line 132 and data line set 133) but be the sum elasticity decision of suitable simplification and the connecting line that wherein comprised, that is the running demand of visible electronic system 100 and resource distribution situation, decide data line to gather the sum of the data line that is comprised in 133.For instance, if 120 of microprocessing units can offer the limited amount of I/O pin of the usefulness of asynchronous demonstration transmission, then data line is gathered in 133 and can be included less data line; If for asynchronous image transmission higher frequency range requirement is arranged, then can include more data line in the data line set 133.
In addition, the asynchronous demonstration transmission interface of above embodiment can provide quite high transmission speed, with sequential chart shown in Figure 4 is example, every 6 clock period through reference clock RCK, can transmit a required pixel of 6 plane plates by data-signal DA1～DA3.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (11)
1. electronic system, it includes:
Display device;
Microprocessing unit is used for controlling the running of this electronic system; And
Display driver is coupled to this microprocessing unit and this display device, is used for driving this display device according to the control of this microprocessing unit;
Wherein be to interconnect between this microprocessing unit and this display driver by model selection line, reference clock line and data line set, this microprocessing unit is informed this display driver one existing transmission mode by this model selection line, and transmit reference clock to this display driver by this reference clock line, and this microprocessing unit comes synchronization to be transmitted in the data that this data line is gathered with this display driver according to this reference clock.
2. electronic system according to claim 1, wherein this display driver includes the working storage unit, in order to store the running setting value of this display driver, and when this existing transmission mode was the working storage access mode, this microprocessing unit was by this this working storage unit of this display driver access of data line set control.
3. electronic system according to claim 1, wherein this display driver includes memory cell, in order to store the picture data that this display driver drives this display device according to this, and when this existing transmission mode was data-transmission mode, this microprocessing unit was by this this this memory cell of display driver access of data line set control.
4. electronic system according to claim 1, wherein this display device is asynchronous display device.
5. electronic system according to claim 1, wherein this microprocessing unit does not transmit picture data to this display driver with fixing frame updating frequency.
6. a data transmission method is used for carrying out communication for microprocessing unit and display driver, and this display driver is used for according to the controlling and driving display device of this microprocessing unit, and this method includes:
This microprocessing unit is informed this display driver one existing transmission mode;
This microprocessing unit transmits reference clock to this display driver; And
This microprocessing unit and this display driver use this reference clock to carry out communication as synchronous foundation.
7. data transmission method according to claim 6, wherein be to interconnect between this microprocessing unit and this display driver by model selection line, reference clock line and data line set, this microprocessing unit is informed this existing transmission mode of this display driver by this model selection line, and transmit this reference clock to this display driver by this reference clock line, and this microprocessing unit and this display driver come synchronization to be transmitted in data in this data line set according to this reference clock.
8. data transmission method according to claim 6, wherein this microprocessing unit and this display driver step of using this reference clock to carry out communication as synchronous foundation includes:
When this existing transmission mode was the working storage access mode, this microprocessing unit was by the working storage unit in this this this display driver of display driver access of data line set control.
9. data transmission method according to claim 6, wherein this microprocessing unit and this display driver step of using this reference clock to carry out communication as synchronous foundation includes:
When this existing transmission mode was data-transmission mode, this microprocessing unit was by the memory cell in this this this display driver of display driver access of data line set control.
10. data transmission method according to claim 6, wherein this display device is asynchronous display device.
11. data transmission method according to claim 6, wherein this microprocessing unit does not transmit picture data to this display driver with fixing frame updating frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610172121XA CN101211549A (en) | 2006-12-27 | 2006-12-27 | Data-transmission method applies to asynchronous display and related electronic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610172121XA CN101211549A (en) | 2006-12-27 | 2006-12-27 | Data-transmission method applies to asynchronous display and related electronic system |
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| Publication Number | Publication Date |
|---|---|
| CN101211549A true CN101211549A (en) | 2008-07-02 |
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| CNA200610172121XA Pending CN101211549A (en) | 2006-12-27 | 2006-12-27 | Data-transmission method applies to asynchronous display and related electronic system |
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