CN101339738A - Single line cascade chip for lamp point display - Google Patents
Single line cascade chip for lamp point display Download PDFInfo
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Abstract
The invention discloses a single line cascade chip used for displaying, which comprises an input signal pin and an output signal pin. The single line cascade chip also comprises a signal decoding module, a signal receiving module and a signal sending module which are connected in series between the input signal pin and the output signal pin and respectively used for decoding and intercepting the input signals and sending the input signals to other chips; the single line cascade chip also comprises a pulse width modulation control module which is connected with the signal receiving module and used for sending the intercepted signals to a light point connected with the single line cascade chip. By completing the operation of coding and decoding of the cascade signals, the single line cascade chip can send and receive the cascaded signal. The single line cascade chip can transmit the cascade signals without decrement, thus assuring that a plurality of single line cascade chips can be cascaded to construct a bigger light point display system.
Description
Technical field
The present invention relates to a kind of semiconductor devices, relate in particular to a kind of single line cascade chip that can be used to show.
Background technology
In the middle of lamp point display system,,, thereby just must carry out the more lamp point of cascade cascade to display control chip if will realize large-scale lamp point display system because the lamp point number that each display control chip can drive is limited.Described lamp point is meant a pixel, can be made up of three LED lamps, for example red LED lamp (RLED), green LED lamp (GLED) and blue led lamp (BLED).
Existing display control chip often needs four or more cascade transmission lines to realize the transmission of cascade signal, as shown in Figure 1, between display control chip 101 and the display control chip 102, use four level on lines to carry out cascade respectively between display control chip 102 and the display control chip 103.Four cascade transmission lines in parallel among Fig. 1 are followed successively by single line cascade chip transmission signals clk (Clock, clock signal), data (data-signal), load (being written into signal), oe (output enable, output enable signal) from top to bottom; And display control chip also is by four cascade signals that receive the lamp point that connects to be controlled.
The existing display control chip of the lamp point that connects being controlled according to four cascade signals that receive, its functional schematic is as shown in Figure 2: it is under the control of input clock signal CKIN, serial input data DIN is carried out shift LD, and be written into the control of signal LIN and output enable signal OEBIN by data, divide three-channel parallel output with serial input data, be OUT0 among Fig. 2, OUT1, OUT2, these three signals are the parallel output signal that control RLED, GLED, BLED light; Simultaneously, the serial input data output DOUT after display control chip will be shifted, clock signal CKOUT, output enable signal OEBOUT, output are written into the direct cascade output that signal LOUT all is corresponding input signals.The timing diagram of existing display control chip correspondence needs to guarantee strict sequential matching relationship as shown in Figure 3 between the signal on four transmission lines.
In the lamp point display system, a plurality of display control chip cascades are called first order chip with first display control chip of cascade, for example the chip among Fig. 1 101; Second display control chip of cascade is called second level chip, for example the chip among Fig. 1 102; And the like, n display control chip of cascade is called n level chip.
Every grade of chip is shifted to serial data according to input clock, by the cascade output terminal this clock is delivered to the next stage chip then.Yet every grade of cascade chip is to the rising edge t of clock signal (clk)
PLHWith negative edge t
PHLThe delay difference that produces causes the high level time of clock signal elongated, and low level time shortens, and promptly distortion has taken place the clock signal, as shown in Figure 4.Just existing display control chip for through level cache, because the response characteristic of buffer memory own there are differences, makes the every change that parameter all can take place through level cache of cascade clock signal to the influence equivalence of the clock signal passed through.Like this, when lamp point display system was cascaded to the 5th grade of chip, because the continuous accumulation of above-mentioned distortion, the clock signal low level width had made the retention time t of serial data signal data
HBe negative value, promptly serial data signal data can't correctly be shifted, and this also names a person for a particular job out of control with regard to the lamp of all chip controls after meaning the 4th grade, make existing display control chip not be suitable for the big lamp point display system of cascade chip number.
Therefore, there is defective in prior art, needs further improvement and develops.
Summary of the invention
The object of the present invention is to provide a kind of single line cascade chip that is used for cascade, can reduce clock signal delay the influence of data signal transmission ground.
Technical scheme of the present invention is as follows:
A kind of single line cascade chip that is used for cascade, comprise input signal pin and output signal pin, wherein, described single line cascade chip also comprises signal decoding module, signal receiving module and the signal transmitting module that is connected on successively between described input signal pin and the input signal pin, is respectively applied for described input signal decoding, intercepts and send to other chips;
Described single line cascade chip also comprises the pulse width modulation controlled module that is connected with described signal receiving module, is used for the signal of intercepting is sent to the lamp point that is connected with described single line cascade chip.
Described single line cascade chip wherein, also comprises the data memory module that is connected on the described pulse width modulation controlled module, is used for the signal by the described intercepting of described pulse width modulation controlled module stores.
Described single line cascade chip, wherein, described signal decoding module comprises the extraction unit and the data signal extraction unit of frequency signal extraction unit, synchronizing signal, is used for decoding and obtains frequency signal, synchronizing signal and data-signal respectively.
Described single line cascade chip, wherein, described frequency signal extraction unit also is connected with pilot lamp, is used for the validity of frequency signal is pointed out.
Described single line cascade chip, wherein, described signal receiving module comprises data-signal decoding unit and data-signal interception unit, is respectively applied for the data-signal of decoding and intercept controlled lamp point in data-signal ground.
Described single line cascade chip, wherein, the data-signal of the control lamp point that described pulse width modulation controlled module sends comprises: the control signal of the control signal of red LED lamp, the control signal of green LED lamp and blue led lamp
Described single line cascade chip, wherein, the data-signal of the control lamp point that described pulse width modulation controlled module sends comprises the control signal of controlling and driving chip.
Compared with prior art, a kind of single line cascade chip that lamp point shows control that is used for provided by the invention, finish reception and transmission by the mode of all cascade signal being carried out Code And Decode operation to cascade signal at each grade chip, guaranteed the undamped transmission in cascade signal ground, make single line cascade chip cascade in large quantities, to make up bigger lamp point display system.
Description of drawings
Fig. 1 is the synoptic diagram of display control chip cascade under the prior art;
Fig. 2 is the functional schematic of display control chip under the prior art;
Fig. 3 is the timing diagram of display control chip under the prior art;
Fig. 4 is between the display control chip of cascade under the prior art, the distortion synoptic diagram of clock signal;
Fig. 5 is the structural representation of single-wire drive chip of the present invention;
Fig. 6 is the structural representation of signal decoding module of the present invention;
Fig. 7 is the structural representation of signal receiving module of the present invention;
Fig. 8 is the structural representation of single line control chip of the present invention;
Fig. 9 extracts the sequential chart of frequency signal for frequency signal extraction unit of the present invention;
Figure 10 extracts the sequential chart of data-signal for data signal extraction of the present invention unit.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in further detail.
The single line cascade chip 500 that is used for the demonstration of lamp point provided by the invention, as shown in Figure 5, comprise input signal pin 510 and output signal pin 550, also comprise the signal decoding module 520, signal receiving module 530 and the signal transmitting module 540 that are connected in order between described input signal pin 510 and the output signal pin 550, also be connected with pulse width modulation controlled module 560 on the described signal receiving module.Described signal decoding module 520 is used for the input signal of receiving inputted signal pin 510, and input signal decoded sends to described signal receiving module 530 again; Described signal receiving module 530 is used for sending to described pulse width modulation controlled module 560 from decoded input signal intercept signal, and the signal after will intercepting sends to described signal transmitting module 540; Described signal transmitting module 540 is used for the input signal after the intercepting is encoded, and sends to other chip with described single wire chip 500 cascades; Described pulse-length modulation control module 560 is used to receive described signal receiving module 530 intercept signals, and the lamp point that is connected with described single wire chip 500 according to the signal controlling of described intercepting, described lamp point can be red LED lamp, blue led lamp, green LED lamp, reach the lamp point of other kind, not add restriction here.
The mode of the mode of 520 pairs of input signal decodings of signal decoding module of the present invention and 540 pairs of input signal codings of described signal transmitting module all is the pulse width modulation (PWM of particular duty cycle, Pulse Width Modulation), the use of described pulse width modulation, described single line cascade chip 500 has been realized the input signal single line transmission of cascade signal just, and make chip easier to the transmission control of cascade signal
Described single line cascade chip 500 provided by the invention further, also connects data memory module 570, as shown in Figure 5 on described pulse-length modulation control module 560.Described data memory module 570 is stored by the intercept signal of 560 pairs of described signal receiving modules 530 of pulse-length modulation control module, and is used for providing intercept signal to described pulse-length modulation control module 560.The setting of described data memory module 570, big in described intercept signal output quantity, but the fan-out capability of described pulse-length modulation control module 560 hour plays the effect of buffer memory
It is specific as follows that 521 pairs of input signals of described frequency signal extraction unit carry out the process that frequency information extracts, as shown in Figure 9: the mean value of getting continuously several data input signals (sin) local clock (sclk) number of cycles (f_count) that the clock period comprised is as frequency information (time-last), described frequency information is as a multiple value with reference to amount with local clock, rather than an absolute frequency values, the gained frequency information is integral multiple.Described frequency signal extraction unit 521 can also calculate the relation of input signal transmission cycle and local clock ratio between the cycle, described ratio relation and predetermined value are compared, when any one situation took place in the middle of, cycle differentiation too short when excessive cycle, cycle was excessive, described frequency errors indicating member 524 can be lighted by control one described external pilot lamp.
Described synchronizing signal extraction unit 522 is the ratio between the cycle according to input signal transmission cycle and local clock, extracts the synchronizing signal of described input signal.
Sampled to this value in a certain particular moment in the cycle of every 1bit input signal in described data signal extraction unit 523, the value of input signal is composed to data information signal data with this moment; If sampling obtains high level, think that then these input data are logical one, otherwise, think that these input data are logical zero, by the extraction of said method realization data-signal, as shown in figure 10.
Described signal decoding module 520 comprises that with input signal frequency signal, synchronizing signal and data-signal send to described signal receiving module 530 after adopting the pulse width modulation of particular duty cycle that input signal is decoded.
Described signal receiving module 530 comprises the signal memory cell 536 after frequency storage unit 531, synchronizing signal storage unit 532, data-signal storage unit 533 and the extraction, be respectively applied for the signal after frequency signal, synchronizing signal, data-signal and the extraction that storage sends by described signal decoding module 520, as shown in Figure 7.Described data-signal storage unit 533 is connected with data-signal decoding unit 534, be used for described data-signal storage unit 533 stored data signal are carried out protocol-decoding, described protocol-decoding process also is to adopt the pulse width modulation of particular duty cycle to carry out.Described data-signal decoding unit 534 is connected with data-signal interception unit 535, is used for being called intercept signal from the data-signal of decoding data signal intercepting control lamp point.
Data-signal after signal after the extraction that described signal receiving module 530 will be stored and the intercepting sends to described signal transmitting module 540, and frequency signal, synchronizing signal and intercept signal are stored by described data memory module 570 by described pulse-length modulation control module 560.
Signal and intercept signal after the extraction that described signal transmitting module 540 will receive are encoded with the pulse width modulation of particular duty cycle, obtain the output signal of serial, and send to other single line cascade chip that is connected with described single line cascade chip 500.
Described pulse-length modulation control module 560 is by certain logical order sense data from described data memory module 570, through obtaining the lamp point drive signal of PWM form after the signal Processing, and this drive signal exported to the lamp point that is connected with described single line display chip single line cascade chip 500, drive the lamp point and light.
The single line cascade chip that is used to show provided by the invention further comprises single line cascade chip 800, and as shown in Figure 8, described single line cascade chip 800 is compared with single line cascade chip 500, is the output difference at control end.The pulse-length modulation control module 810 of described single line cascade chip 800 is exported the signal that is used for chip for driving 820 according to the data in the described data memory module 570.Described single line cascade chip 800 is connected with the chip for driving 820 and the chip for driving 830 of series connection, and the chip for driving of described series connection can have a plurality of.
The single line cascade chip that this law is bright, operation by decoding and coding intercepts and transmits to input signal, solve because the deviation accumulation problem that chip cascade produces has guaranteed the undamped transmission of cascade signal, thereby but increase the quantity of cascade single wire chip greatly.
Should be understood that above-mentioned statement at preferred embodiment of the present invention is comparatively detailed, can not therefore think the restriction to scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with claims.
Claims (7)
1, a kind of single line cascade chip that is used to show, comprise input signal pin and output signal pin, it is characterized in that, described single line cascade chip also comprises signal decoding module, signal receiving module and the signal transmitting module that is connected on successively between described input signal pin and the input signal pin, is respectively applied for described input signal decoding, intercepts and send to other chips;
Described single line cascade chip also comprises the pulse width modulation controlled module that is connected with described signal receiving module, is used for the signal of intercepting is sent to the lamp point that is connected with described single line cascade chip.
2, single line cascade chip according to claim 1 is characterized in that, also comprises the data memory module that is connected on the described pulse width modulation controlled module, is used for the signal by the described intercepting of described pulse width modulation controlled module stores.
3, single line cascade chip according to claim 2, it is characterized in that, described signal decoding module comprises the extraction unit and the data signal extraction unit of frequency signal extraction unit, synchronizing signal, is used for decoding and obtains frequency signal, synchronizing signal and data-signal respectively.
4, single line cascade chip according to claim 3 is characterized in that, described frequency signal extraction unit also is connected with pilot lamp, is used for the validity of frequency signal is pointed out.
5, single line cascade chip according to claim 3 is characterized in that, described signal receiving module comprises data-signal decoding unit and data-signal interception unit, is respectively applied for the data-signal of decoding and intercept controlled lamp point in data-signal ground.
6, single line cascade chip according to claim 5 is characterized in that, the data-signal of the control lamp point that described pulse width modulation controlled module sends comprises: the control signal of the control signal of red LED lamp, the control signal of green LED lamp and blue led lamp
7, single line cascade chip according to claim 5 is characterized in that, the data-signal of the control lamp point that described pulse width modulation controlled module sends comprises the control signal of controlling and driving chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101169257A CN101339738B (en) | 2008-07-21 | 2008-07-21 | Single line cascade chip for lamp point display |
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| CN2008101169257A CN101339738B (en) | 2008-07-21 | 2008-07-21 | Single line cascade chip for lamp point display |
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| CN101339738B CN101339738B (en) | 2010-06-02 |
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| CN101984486A (en) * | 2010-10-25 | 2011-03-09 | 深圳市明微电子股份有限公司 | Transmission method capable of setting instructions and transmission device |
| CN102402949A (en) * | 2010-09-07 | 2012-04-04 | 三美电机株式会社 | Backlight apparatus, display apparatus including the backlight apparatus and lighting apparatus |
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| EP1026655A1 (en) * | 1999-02-01 | 2000-08-09 | Deutsche Thomson-Brandt Gmbh | Method for power level control of a display device and apparatus for carrying out the method |
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| CN201042097Y (en) * | 2007-05-29 | 2008-03-26 | 李树强 | LED circuit for single line cascading multi-level gray full color floating charge |
| CN201233711Y (en) * | 2008-07-21 | 2009-05-06 | 北京巨数数字技术开发有限公司 | Single line cascade chip for lamp point display |
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