CN101609652B - Transmission interface and method for reducing power consumption and electromagnetic interference effect - Google Patents
Transmission interface and method for reducing power consumption and electromagnetic interference effect Download PDFInfo
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- CN101609652B CN101609652B CN2008101256679A CN200810125667A CN101609652B CN 101609652 B CN101609652 B CN 101609652B CN 2008101256679 A CN2008101256679 A CN 2008101256679A CN 200810125667 A CN200810125667 A CN 200810125667A CN 101609652 B CN101609652 B CN 101609652B
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Abstract
The embodiment of the invention provides a transmission interface for reducing power consumption and an electromagnetic interference effect, which is used for an LCD (liquid crystal display). The LCD comprises x source electrode drivers, and the i source electrode driver is used for processing k<i> transmitting signals, wherein k<i> is a natural number larger than 1, x is a natural number, and i is an integer from 1 to x. The transmission interface comprises a coding device, wherein the coding device receives sigma<i=1><x>k<i> image signals, sets the sigma<i=1><j>k<i>)-k<j>+1 image signal to be a (sigma<i=1><j>k<i>)-k<j>+1 transmission signal and sets a difference value between the (sigma<i=1><j>k<i>)-k<j>+y<j> image signal and the (sigma<i=1><j>k<i>)-k<j>+y<j>-1 image signal to be a (sigma<i=1><j>k<i>)-k<j>+y<j> transmission signal, wherein j is an integer from 1 to x, and y<j> is an integer from 2 to k<j>.
Description
Technical field
The present invention is about a kind of LCD (Liquid Crystal Display; LCD) internal transmission interface and method; And especially in regard to a kind of minimizing power consumption and electromagnetic interference effect (ElectromagneticInterference, transmitting device EMI) and method thereof.
Background technology
Along with improvement of Manufacturing Technology, slimming LCD has been widely used in each place in the life.Generally speaking; There is the multiple source driver LCD the inside; Each source electrode driver is in order to handle a plurality of transmission signals (just each source electrode driver has a plurality of channels), and then each source electrode driver is delivered to the LCD panel with a plurality of transmission signals of its processing, and produces image.
Please refer to Fig. 1, Fig. 1 is the internal circuit diagram of traditional LC D device 10.This LCD device 10 comprises time schedule controller 110, LCD panel 120, multiple source driver 130 and a plurality of gate drivers 140.Wherein, LCD panel 120 is coupled to multiple source driver 120 and a plurality of gate drivers 140, and clock generator 110 is coupled to multiple source driver 120 and a plurality of gate drivers 140.
Please with reference to Fig. 2, Fig. 2 is a gradually synoptic diagram of the value of layer horizontal line 201 signal of video signal 200 a plurality of with it.The resolution of supposing LCD panel 120 is the 1024x768 pixel, and each pixel is to represent with 8, and the gradually layer horizontal line 201 of one 0～255 GTG value be just as shown in Figure 2 so, and the value of its a plurality of signal of video signal 200 is also as shown in Figure 2.Each GTG value is represented with four continuous signal of video signal, and traditional transmission interface is exactly merely a plurality of signal of video signal 200 to be made as a plurality of transmission signals directly to send each source electrode driver to.
If hypothesis has 8 source electrode drivers, each source electrode driver can be handled 128 signal of video signal 200, and j source electrode driver can be handled the signal of video signal 200 of the GTG value of [32 (j-1)]～(32j-1) so, and wherein, j is 1 to 8 integer.After a horizontal signal of video signal 200 of complete gradually layer is all passed to source electrode driver 130; Arrange in pairs or groups the again control of gate drivers 140; Can on LCD, show a complete gradually layer horizontal line, so repeating 768 times can show complete image frame.
In sum, traditional LC D is in transmission during image frame, and no matter transmission interface why, all directly the signal of video signal of each point is made as transmission signals and transmits, even if picture is consecutive identical signal of video signal, each signal of video signal all needs complete heavy sending.Therefore, traditional transmission interface is easy to generate serious EMI and the mistake that causes transmitting, and in addition, the signal of video signal that re-transmitted is identical will cause its consumed power too high, and does not meet the march toward trend of low consumpting power of present electronic product.
Summary of the invention
Example of the present invention proposes a kind of transmission interface and method thereof that reduces power consumption and electromagnetic interference effect, and this transport interface and method thereof are applied to LCD.This transmission interface and method thereof are utilized the continuity of picture data, and the signal of video signal that originally transmits each point is transmitted the difference of the signal of video signal of consecutive point instead, consumed power when reducing transmission by this and the influence of EMI.
Example of the present invention provides a kind of transmission interface that reduces power consumption and electromagnetic interference effect, and this transmission interface is used for LCD, and this LCD comprises x source electrode driver.I source electrode driver is in order to handle k
iIndividual transmission signals, wherein, k
iFor greater than 1 natural number, x is a natural number, and i is 1 to x integer.This transmission interface comprises code device, and this code device receives (∑
I=1 xk
i) individual signal of video signal.Then, this code device is with [(∑
I=1 jk
i)-k
j+ 1] individual signal of video signal is made as [(∑
I=1 jk
i)-k
j+ 1] individual transmission signals is to be about to [(∑
I=1 jk
i)-k
j+ y
j] individual signal of video signal and [(∑
I=1 jk
i)-k
j+ y
j-1] difference of individual signal of video signal is made as [(∑
I=1 jk
i)-k
j+ y
j] individual transmission signals, wherein, j is 1 to x integer, y
jBe 2 to k
jInteger.
According to example of the present invention, above-mentioned transmission interface also comprises code translator, and wherein, code translator is coupled to code device.Code translator is in order to (the ∑ with code device output
I=1 xk
i) individual transmission signals is deciphered, and the [(∑ after will deciphering
I=1 jk
i)-k
j+ 1] individual to (∑
I=1 jk
i) individual transmission signals delivers to j source electrode driver.Wherein, [(∑
I=1 jk
i)-k
j+ 1] value of individual transmission signals after decoding remains unchanged, and [(∑
I=1 jk
i)-k
j+ y
j] individual transmission signals through decoding after value be [(∑
I=1 jk
i)-k
j+ 1] individual transmission signals to the [(∑
I=1 jk
i)-k
j+ y
j] total value of individual transmission signals.
According to example of the present invention, above-mentioned transmission interface also comprises x code translator, and wherein, this x code translator is coupled to code device.J code translator is in order to [(∑
I=1 jk
i)-k
j+ 1] individual to (∑
I=1 jk
i) individual transmission signals is deciphered, and the [(∑ after will deciphering
I=1 jk
i)-k
j+ 1] individual to (∑
I=1 jk
i) individual transmission signals delivers to j source electrode driver.Wherein, [(∑
I=1 jk
i)-k
j+ 1] value of individual transmission signals after decoding remains unchanged [(∑
I=1 jk
i)-k
j+ yj] individual transmission signals through decoding after value be [(∑
I=1 jk
i)-k
j+ 1] individual transmission signals to the [(∑
I=1 jk
i)-k
j+ y
j] total value of individual transmission signals.
According to example of the present invention, above-mentioned a plurality of transmission signals are identical with the bits number of a plurality of signal of video signal.When [(∑
I=1 jk
i)-k
j+ y
j] individual signal of video signal and [(∑
I=1 jk
i)-k
j+ y
jWhen-1] difference of individual signal of video signal is negative value, [(∑
I=1 jk
i)-k
j+ y
j] individual transmission signals representes its each position with two complement codes (2 ' s complement) of this difference.
Example of the present invention provides a kind of transmission method that reduces power consumption and electromagnetic interference effect, and this transmission method is used for LCD, and this LCD comprises x source electrode driver.I source electrode driver is in order to handle k
iIndividual transmission signals, wherein, k
iFor greater than 1 natural number, x is a natural number, and i is 1 to x integer.This transmission method may further comprise the steps: (a) receive (∑
I=1 xk
i) individual signal of video signal; (b) with [(∑
I=1 jk
i)-k
j+ 1] individual signal of video signal is made as [(∑
I=1 jk
i)-k
j+ 1] individual transmission signals, wherein, j is 1 to x integer; (c) with [(∑
I=1 jk
i)-k
j+ y
j] individual signal of video signal and [(∑
I=1 jk
i)-k
j+ y
j-1] difference of individual signal of video signal is made as [(∑
I=1 jk
i)-k
j+ y
j] individual transmission signals, wherein, y
jBe 2 to k
jInteger.
According to example of the present invention, above-mentioned transmission method, further comprising the steps of: (d) to (∑
I=1 xk
i) individual transmission signals is deciphered, and the [(∑ after will deciphering
I=1 jk
i)-k
j+ 1] individual to (∑
I=1 jk
i) individual transmission signals delivers to j source electrode driver, wherein, [(∑
I=1 jk
i)-k
j+ 1] value of individual transmission signals after decoding remains unchanged, and [(∑
I=1 jk
i)-k
j+ y
j] individual transmission signals through decoding after value be [(∑
I=1 jk
i)-k
j+ 1] individual transmission signals to the [(∑
I=1 jk
i)-k
j+ y
j] total value of individual transmission signals.
According to example of the present invention, above-mentioned a plurality of transmission signals are identical with the bits number of a plurality of signal of video signal, when [(∑
I=1 jk
i)-k
j+ y
j] individual signal of video signal and [(∑
I=1 jk
i)-k
j+ y
jWhen-1] difference of individual signal of video signal is negative value, [(∑
I=1 jk
i)-k
j+ y
j] individual transmission signals representes its each position with two complement codes of this difference.
Example of the present invention proposes another kind of transmission interface, and this transmission interface is used for LCD.This LCD comprises at least one source electrode driver, and transmission interface comprises code device.Source electrode driver is in order to handle x transmission signals, and wherein, x is the integer greater than 1.Code device receives x signal of video signal; First signal of video signal of x signal of video signal is encoded to first transmission signals, and is y transmission signals, to produce x transmission signals the differential coding of y signal of video signal and (y-1) individual signal of video signal; Wherein, y is 2 to x integer.
According to example of the present invention, above-mentioned transmission interface also comprises code translator.Code translator is coupled to code device, receives x transmission signals in order to code device, x transmission signals deciphered, and the transmission signals of the x after will deciphering is delivered to source electrode driver.
According to example of the present invention; Above-mentioned a plurality of transmission signals are identical with the bits number of a plurality of signal of video signal; When the difference of y signal of video signal and (y-1) individual signal of video signal was negative value, y transmission signals represented its each position with two complement codes (2 ' s complement) of difference.
Example of the present invention proposes another kind of transmission method, and this transmission method is used for LCD.LCD comprises at least one source electrode driver, and source electrode driver is in order to handle x transmission signals, and wherein, x is the integer greater than 1.This transmission method comprises the steps: that (1) receives x signal of video signal; (2) first signal of video signal with x signal of video signal is encoded to first transmission signals; (3) differential coding with y signal of video signal and (y-1) individual signal of video signal is a y transmission signals, and wherein, y is 2 to x integer.
According to example of the present invention, above-mentioned transmission method, further comprising the steps of: x transmission signals deciphered in (4), and the transmission signals of the x after will deciphering is delivered to source electrode driver.
According to example of the present invention; Above-mentioned a plurality of transmission signals are identical with the bits number of a plurality of signal of video signal; When the difference of y signal of video signal and (y-1) individual signal of video signal was negative value, y transmission signals represented its each position with two complement codes (2 ' s complement) of difference.
Transmission interface that example of the present invention provided and method be because of utilizing the continuity of picture data, and the signal of video signal that transmits each point is originally transmitted the difference of the signal of video signal of consecutive point instead, consumed power when reducing transmission by this and the influence of EMI.Therefore, compare with method with traditional transmission interface, transmission interface that example of the present invention provided and method have advantages such as low consumpting power and anti-EMI.
For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts embodiment, and cooperates appended graphicly, elaborates as follows.
Description of drawings
Fig. 1 is the internal circuit diagram of traditional LC D device 10.
Fig. 2 is a gradually synoptic diagram of the value of layer horizontal line 201 signal of video signal 200 a plurality of with it.
Fig. 3 A is that the conventional transmission interface transmits a gradually synoptic diagram of the horizontal a plurality of transmission signals of layer.
Fig. 3 B is that the transmission interface that example according to the present invention provides transmits a gradually synoptic diagram of the horizontal a plurality of transmission signals of layer.
Fig. 3 C is a conceptual schematic view of calculating a plurality of red transmission signals 310 in the example of Fig. 3 B.
Fig. 4 A is the gradually synoptic diagram of layer horizontal line 400 of a GTG.
Fig. 4 B is the gradually synoptic diagram of the value of a plurality of signal of video signal of layer horizontal line 400 of Fig. 4 A GTG.
Fig. 4 C is the synoptic diagram of a plurality of red transmission signals 420 of the transmission interface that example provides according to the present invention.
Fig. 5 A is the calcspar that transmission interface 560 that example of the present invention provides is applied to LCD device 50.
Fig. 5 B is the calcspar that transmission interface 565 that another example of the present invention provides is used for LCD device 52.
Fig. 5 C is the calcspar that transmission interface 570 that another example of the present invention provides is used for LCD device 51.
Fig. 6 is the flow chart of steps of the transmission method that provides of example of the present invention.
Fig. 7 A is the signal of video signal oscillogram that adopts the LCD device of the low differential signal interface of multiple spot.
Fig. 7 B is to use the transmission signals oscillogram of the signal of video signal of conventional transmission interface transmission diagram 7A.
Fig. 7 C is to use the transmission signals oscillogram of the signal of video signal of the transmission interface transmission diagram 7A that example of the present invention provides.
[primary clustering symbol description]
The 10:LCD device
110: time schedule controller
The 120:LCD panel
130: source electrode driver
140: gate drivers
200: signal of video signal
201: GTG is layer horizontal line gradually
300: red transmission signals
301: green transmission signals
302: blue transmission signals
310: red transmission signals
311: green transmission signals
312: blue transmission signals
320: red signal of video signal
400: GTG is layer horizontal line gradually
410: red signal of video signal
411: green signal of video signal
412: blue signal of video signal
420: red transmission signals
The 50:LCD device
The 51:LCD device
The 52:LCD device
510: time schedule controller
The 520:LCD panel
530: source electrode driver
540: gate drivers
560: transmission interface
561: code translator
562: code device
565: transmission interface
566: code device
567: code translator
570: transmission interface
577: code device
578: code translator
S610～S640: steps flow chart
CLK: clock signal
LV0～LV5: transmission line
0R0～0R5: the position of first red signal of video signal
0G0～0G5: the position of first green signal of video signal
0B0～0B5: the position of first blue signal of video signal
1R0～1R5: the position of second red signal of video signal
1G0～1G5: the position of second green signal of video signal
1B0～1B5: the position of second blue signal of video signal
2R0～2R5: the position of the 3rd red signal of video signal
2G0～2G5: the position of the 3rd green signal of video signal
2B0～2B5: the position of the 3rd blue signal of video signal
3R0～3R5: the position of the 4th red signal of video signal
3G0～3G5: the position of the 4th green signal of video signal
3B0～3B5: the position of the 4th blue signal of video signal
Embodiment
Please earlier with reference to Fig. 3 A～3C; Fig. 3 A is that the conventional transmission interface transmits a gradually synoptic diagram of the horizontal a plurality of transmission signals of layer; Fig. 3 B is the gradually synoptic diagram of the horizontal a plurality of transmission signals of layer of one of the transmission interface transmission that provides of example according to the present invention, and Fig. 3 C is a conceptual schematic view of calculating a plurality of red transmission signals 310 in the example of Fig. 3 B.Fig. 3 A and 3B are the situation (just a source electrode driver has 1024*3 passage) that source electrode driver of hypothesis can be handled 1024 transmission signals, and gradually the horizontal GTG value of layer is 0 to 255, and the signal of video signal of every bit has red signal of video signal, green signal of video signal and blue signal of video signal, so the value of these red signal of video signal, green signal of video signal and blue signal of video signal is all { 0; 0,0,0,1; 1,1,1 ...; 255,255,255, the sequence of 255}.In addition, the transmission signals of every bit has red transmission signals, green transmission signals and blue transmission signals.
If when using the conventional transmission interface to transmit the horizontal signal of video signal of above-mentioned gradually layer, the transmission signals of delivering to source electrode driver just can be as shown in Fig. 3 A, the value of these redness, green and blue transmission signals 300～302 is can be respectively identical with the value of original a plurality of redness, green and blue signal of video signal, just is all { 0; 0,0,0,1; 1,1,1 ...; 255,255,255, the sequence of 255}.Therefore, the conventional transmission interface may produce the mentioned problem of prior art when the successional signal of video signal of transmission.
If adopt the transmission interface that example of the present invention provided, the transmission signals of delivering to source electrode driver just can be as shown in Fig. 3 B and the 3C.Because signal of video signal has successional relation, so the value of first red transmission signals 310 is 0, the value of k red transmission signals 310 then is k red signal of video signal 320 and the difference of (k-1) individual red shadow signal 320 afterwards.In addition, a plurality of green transmission signals 311 and a plurality of blue transmission signals 312 value can also the rest may be inferred.In this example, these redness, value green and blue transmission signals 310～312 be 0,0,0,0,1,0,0,0,1 ..., 1,0,0, the sequence of 0}.
Yet, the LCD multiple source driver of arranging in pairs or groups usually, for instance, LCD 8 source electrode drivers that can handle 384 channels of can arranging in pairs or groups.Each source electrode driver can be handled 128 transmission signals, and each transmission signals has redness, green and blue transmission signals.
Please with reference to Fig. 4 A～4C; Fig. 4 A is the gradually synoptic diagram of layer horizontal line 400 of a GTG; Fig. 4 B is the gradually synoptic diagram of the value of a plurality of signal of video signal of layer horizontal line 400 of Fig. 4 A GTG, and Fig. 4 C is the synoptic diagram of a plurality of red transmission signals 420 of the transmission interface that example provides according to the present invention.Gradually layer horizontal line 400 is gradually layer horizontal line 400 of 0～255 GTG, and gradually the value of a plurality of signal of video signal of layer horizontal line 400 is as shown in Fig. 4 B for GTG, and its a plurality of red signal of video signal 410, a plurality of green signal of video signal 411 are all { 0,0 with the value of a plurality of blue signal of video signal 412; 0,0,1,1; 1,1 ..., 255; 255,255, the sequence of 255}.
Suppose that the transmission interface that this example provides is the LCD that is used to have 8 source electrode drivers, and each source electrode driver can be handled 128 transmission signals (just having 384 passages).It is individual to (128p) individual transmission signals that just p source electrode driver can be received [128 (p-1)+1], and wherein, p is 1 to 8 integer.
According to above-mentioned hypothesis, adopt transmission signals in the transmission interface that example of the present invention provides as shown in Fig. 4 C.Please note at this; Because transmission signals of the present invention mainly is to transmit with the difference of signal of video signal, therefore, for each source electrode driver; First signal that each source electrode driver received must be an initial value, and signal so thereafter could be represented it with difference.
Therefore; The individual red signal of video signal in [128 (p-1)+1] individual red transmission signals 420 and [128 (p-1)+1] 410 is identical; [128 (p-1)+y] individual red transmission signals 420 then is the difference of [128 (p-1)+y] individual red signal of video signal 410 and [128 (p-1)+y-1] individual red signal of video signal 410; Wherein, y is 2 to 128 integer.
For instance; Please continue C with reference to Fig. 4; According to top formula; The 129th red transmission signals 420 is identical with the 129th red signal of video signal 410, and this is that therefore the 129th red transmission signals 420 handled by second source electrode driver because each source electrode driver is handled only 128 transmission signals.In addition, the value of a plurality of green transmission signals and a plurality of blue transmission signals then can the rest may be inferred, just seldom gives unnecessary details at this.
Then, please refer to Fig. 5 A, Fig. 5 A is the calcspar that transmission interface 560 that example of the present invention provides is applied to LCD device 50.This transmission interface 560 comprises code device 562 and code translator 561, and code device 562 is between time schedule controller 510 and multiple source driver 530, and code translator 560 is then between multiple source driver 530 and time schedule controller 510.In this embodiment, code device 562 is to be contained in the time schedule controller 510.
(the ∑ of code translator 561 in order to code device 562 is exported
I=1 xk
i) individual transmission signals deciphers, and will decipher back [(∑
I=1 jk
i)-k
j+ 1] to [(∑
I=1 jk
i)] individual transmission signals sends j source electrode driver to.Wherein, [(∑
I=1 jk
i)-k
j+ 1] value of individual transmission signals after decoding remains unchanged [(∑
I=1 jk
i)-k
j+ y
j] individual transmission signals through decoding after value be [(∑
I=1 jk
i)-k
j+ 1] individual transmission signals to the [(∑
I=1 jk
i)-k
j+ y
j] total value of individual transmission signals.
Generally speaking, the number of each source electrode driver 530 handled transmission signals is identical, just k
I 'Equal k
I '+1, i ' is 1 integer to (x-1), however the transmission interface 560 that example of the present invention provided not is to be defined for the situation that each source electrode driver 530 is all handled the transmission signals of the same number.
In addition, as noted earlier, each signal of video signal comprises redness, green and blue signal of video signal, and each transmission signals then comprises redness, green and blue signal of video signal.
The transmission signals that each source electrode driver 530 is handled the same number mentions in aforesaid Fig. 4 A～4C that at this, the situation of handling the transmission signals of different numbers with two source electrode drivers 530 is an example.The source electrode driver of supposing LCD device 50 has two source electrode drivers 530, and has horizontal a plurality of signal of video signal to transmit, and a plurality of red signal of video signal of these signal of video signal is { 1,2,2,2,3; 3,3, the sequence of 3}, its a plurality of green signal of video signal are { 0,0,0,2; 2,2,2, the sequence of 2}, its a plurality of blue signal of video signal then are { 5,7; 7,7,7,7,8, the sequence of 8}.
If first source electrode driver 530 can be handled 5 transmission signals, and second source electrode driver 530 can be handled 3 transmission signals.So 5 red transmission signals of first red transmission signals to the be 1,1,0,0, the sequence of 1}, 8 red transmission signals of the 6th red transmission signals to the be 3,0, the sequence of 0}.5 red transmission signals of first red transmission signals to the are by 530 processing of first source electrode driver, and 8 red transmission signals of the 6th red transmission signals to the are then by second source electrode driver 530.
5 green transmission signals of first green transmission signals to the be 0,0,0,2, the sequence of 0}, 8 green transmission signals of the 6th green transmission signals to the be 2,0, the sequence of 0}.5 green transmission signals of first green transmission signals to the are by 530 processing of first source electrode driver, and 8 green transmission signals of the 6th green transmission signals to the are then by second source electrode driver 530.
5 blue transmission signals of first blue transmission signals to the be 5,2,0,0, the sequence of 0}, 8 blue transmission signals of the 6th blue transmission signals to the be 7,1, the sequence of 0}.5 blue transmission signals of first blue transmission signals to the are by 530 processing of first source electrode driver, and 8 blue transmission signals of the 6th blue transmission signals to the are then by second source electrode driver 530.
To above-mentioned example, 5 red transmission signals of first red transmission signals to the be 1,1,0,0, the sequence of 1}.So when decoding, except first red signal of video signal equaled first red transmission signals, remaining red signal of video signal was the accumulated value of the red transmission signals before it.Therefore 5 red transmission signals of first red transmission signals to the become { 1 after decoding; 2,2,2; The sequence of 3}, and identical through 5 red transmission signals of decoded first red transmission signals to the with 5 red signal of video signal of first red signal of video signal to the.
8 red transmission signals of the 6th red transmission signals to the are { 3; 0, so the sequence of 0} is when decoding; Except the 6th red signal of video signal equaled the 6th red transmission signals, remaining red signal of video signal was the accumulated value of the red transmission signals before it.Therefore 8 red transmission signals of the 6th red transmission signals to the become { 3 after decoding; 0; The sequence of 0}, and identical through 8 red transmission signals of decoded the 6th red transmission signals to the with 8 red signal of video signal of the 6th red signal of video signal to the.In addition, a plurality of green transmission signals and blue transmission signals then can the rest may be inferred, just seldom give unnecessary details at this.
Mutually the same in this bits number that note that above-mentioned a plurality of transmission signals and a plurality of signal of video signal.When [(∑
I=1 jk
i)-k
j+ y
j] individual signal of video signal and [(∑
I=1 jk
i)-k
j+ y
jWhen-1] difference of individual signal of video signal is negative value, [(∑
I=1 jk
i)-k
j+ y
j] individual transmission signals can use two complement codes (2 ' s complement) of its difference to represent its each position.
Since to face two signal of video signal might be from high gray to low GTG mutually or low GTG to high gray, so variation range is from-255～255.Suppose to utilize 8 signal of video signal to transmit.Because the value of signal of video signal is 0～255, therefore by low order to high-order, just can directly pass its difference.But during to low order, in order not increase bits number and still need to transmit correct transmission signals, therefore, above-mentioned example adopts the expression mode of its two complement code to solve this problem to the difference of its negative value by high-order.
For example the difference of two signal of video signal is-127, so just must transmission 129.By scale-of-two, the 127th, 0111 1111}, and its two complement code is that { 1000 0001}, just 127 two complement codes are 129.And code translator 561 is only got 8 minimum positions during with 127 and 129 additions, and the position of the overflow of its addition result is cast out, and just can solve correct signal of video signal.With scale-of-two, { 0111 1111} is with { result of 10000001} addition is that { 1 0000 0000}, (LeastSignificant Bits just is 0 LSBs) so only get 8 minimum significance bits of addition result.Therefore, as if being negative, by the transmission of a complement code, just can correctly solve signal of video signal so in thereafter by difference between signal.
Then, please with reference to Fig. 5 B, Fig. 5 B is a preferred embodiment calcspar of the transmission interface 565 of LCD device 52 of the present invention.In this embodiment, code device 566 still is to be contained in the time schedule controller 510, and code translator 567 is to be contained in the source electrode driver 530.At this moment, the [(∑ of j code translator 567 in order to code device 562 is exported
I=1 jk
i)-k
j+ 1] to [(∑
I=1 jk
i)] individual transmission signals is deciphered, and [(∑ after will deciphering
I=1 jk
i)-k
j+ 1] to [(∑
I=1 jk
i)] individual transmission signals sends j source electrode driver to.Wherein, [(∑
I=1 jk
i)-k
j+ 1] value of individual transmission signals after decoding remains unchanged [(∑
I=1 jk
i)-k
j+ y
j] individual transmission signals through decoding after value be [(∑
I=1 jk
i)-k
j+ 1] individual transmission signals to the [(∑
I=1 jk
i)-k
j+ y
j] total value of individual transmission signals.
Then, please with reference to Fig. 5 C, Fig. 5 C is the calcspar that transmission interface 570 that another example of the present invention provides is used for LCD device 51.The place that Fig. 5 C is different with Fig. 5 B is that code device 577 is to be placed on before the time schedule controller 510, and code device 566 then is the rear end that is placed in the time schedule controller 510.Though these two code devices 577 are different with 566 position, its principle is identical, therefore, also seldom gives unnecessary details at this.In addition, code device 577 can also place the front end in the time schedule controller 510.In brief, be exactly this field have common knowledge the knowledgeable can be via example of the present invention, the transmission interface that example is provided is used in the LCD device, but its position of putting then can be designed according to user's needs.
Then, please with reference to Fig. 6, Fig. 6 is the flow chart of steps of the transmission method that provides of example of the present invention.This transmission method is used for LCD, and this LCD comprises x source electrode driver.I source electrode driver is in order to handle k
iIndividual transmission signals, wherein, k
iFor greater than 1 natural number, x is a natural number, and i is 1 to x integer.This transmission method may further comprise the steps: (S610) receive (∑
I=1 xk
i) individual signal of video signal; (S620) with [(∑
I=1 jk
i)-k
j+ 1] individual signal of video signal is made as [(∑
I=1 jk
i)-k
j+ 1] individual transmission signals, wherein, j is 1 to x integer; (S630) with [(∑
I=1 jk
i)-k
j+ y
j] individual signal of video signal and [(∑
I=1 jk
i)-k
j+ y
j-1] difference of individual signal of video signal is made as [(∑
I=1 jk
i)-k
j+ y
j] individual transmission signals, wherein, y
jBe 2 to k
jInteger; (S640) to (∑
I=1 xk
i) individual transmission signals is deciphered, and the [(∑ after will deciphering
I=1 jk
i)-k
j+ 1] individual to (∑
I=1 jk
i) individual transmission signals delivers to j source electrode driver, wherein, [(∑
I=1 jk
i)-k
j+ 1] value of individual transmission signals after decoding remains unchanged [(∑
I=1 jk
i)-k
j+ y
j] individual transmission signals through decoding after value be [(∑
I=1 jk
i)-k
j+ 1] individual transmission signals to the [(∑
I=1 jk
i)-k
j+ y
j] total value of individual transmission signals.
Certainly, above-mentioned a plurality of transmission signals are identical with the bits number of a plurality of signal of video signal.And when [(∑
I=1 jk
i)-k
j+ y
j] individual signal of video signal and [(∑
I=1 jk
i)-k
j+ y
jWhen-1] difference of individual signal of video signal is negative value, [(∑
I=1 jk
i)-k
j+ y
j] individual transmission signals can use two complement codes (2 ' s complement) of this difference to represent its each position.
In addition, the number of the handled transmission signals of each source electrode driver can be identical also can be inequality, each signal of video signal comprises redness, green and blue signal of video signal, each transmission signals then comprises redness, green and blue signal of video signal.
Then; Please refer to Fig. 7 A～7C; Fig. 7 A adopts low differential signal (the Multipoint LowVoltage Differential Signaling of multiple spot; MLVDS) the signal of video signal oscillogram of the LCD device of interface, Fig. 7 B is to use the transmission signals oscillogram of the signal of video signal of conventional transmission interface transmission diagram 7A, and Fig. 7 C is to use the transmission signals oscillogram of the signal of video signal of the transmission interface transmission diagram 7A that example of the present invention provides.
Fig. 7 A is that hypothesis is used 66 transmission lines transmission; Wherein, Signal CLK representes clock signal; 6 position 0R0～0R5 of first red signal of video signal of transmission line LV0 transmission and 6 position 2R0～2R5 of the 3rd red signal of video signal; 6 position 0G0～0G5 of first green signal of video signal of transmission line LV1 transmission and 6 position 2G0～2G5 of the 3rd green signal of video signal, 6 position 0B0～0B5 of first blue signal of video signal of transmission line LV2 transmission and 6 position 2B0～2B5 of the 3rd blue signal of video signal.
6 position 1R0～1R5 of second red signal of video signal of transmission line LV3 transmission and 6 position 3R0～3R5 of the 4th red signal of video signal; 6 position 1G0～1G5 of second green signal of video signal of transmission line LV4 transmission and 6 position 3G0～3G5 of the 4th green signal of video signal, 6 position 1B0～1B5 of second blue signal of video signal of transmission line LV5 transmission and 6 position 3B0～3B5 of the 4th blue signal of video signal.
Suppose that each redness, green, blue signal of video signal are all 1; When using the conventional transmission interface so; Transmission signals oscillogram in its transmission line LV0～LV5 is as shown in Fig. 7 B; This moment, each transmission lines LV0～LV5 all must switch (toggle) twice, thus the transmission signals in LV0～LV5 altogether switch (toggle) 12 times.
If when using the transmission interface that example of the present invention provides, the transmission signals oscillogram in its transmission line LV0～LV5 is as shown in Fig. 7 C, the transmission signals in this moment transmission line LV0～LV5 altogether switch 3 times.Because except first redness, green and blue transmission signals are 1, remaining redness, green and blue transmission signals are 0.Therefore, can know by above-mentioned example, the transmission interface that example of the present invention provides, the switch number of times between its transmission signals is less, therefore can save consumed power and the influence that reduces EMI.
In sum, transmission interface that example of the present invention provided and method utilize signal of video signal to have successional characteristic usually, and except specific pixel need transmit complete signal of video signal, remaining was counted and then transmits the difference of adjacent signal of video signal at 2.So, just can reduce the variation that data come the transmission signals of line, and then reach the influence of saving consumed power and reducing EMI.
Though the present invention discloses as above with embodiment; Right its is not in order to limit the present invention; Has common knowledge the knowledgeable in the technical field under any; Do not breaking away from the spirit and scope of the present invention, when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (11)
1. a transmission interface is used for a LCD, and this LCD comprises x source electrode driver, and this i source electrode driver is in order to handle k
iIndividual transmission signals, wherein, k
iFor greater than 1 natural number, x is a natural number, and i is 1 to x integer, and this transmission interface comprises:
One code device receives
Individual signal of video signal, with this
Individual signal of video signal be made as this
Individual transmission signals, with this
Individual signal of video signal and this
The difference of individual signal of video signal be made as this
Individual transmission signals, wherein, j is 1 to x integer, y
jBe 2 to k
jInteger; And
One code translator; Be coupled to this code device; Be somebody's turn to do
individual transmission signals in order to receive, this
individual transmission signals is deciphered from this code device.
2. transmission interface as claimed in claim 1; This
after wherein this code translator also will be deciphered is individual to deliver to this j source electrode driver to this
individual transmission signals; Wherein, The value of this
individual transmission signals after decoding remains unchanged, and the value of this
individual transmission signals after decoding is the total value of this
individual transmission signals to this
individual transmission signals.
3. transmission interface as claimed in claim 1 also comprises:
X code translator; Be coupled to this code device; This j code translator is in order to decipher to this
individual transmission signals this
is individual; And this
after will deciphering is individual delivers to this j source electrode driver to this
individual transmission signals; Wherein, The value of this
individual transmission signals after decoding remains unchanged, and the value of this
individual transmission signals after decoding is the total value of this
individual transmission signals to this
individual transmission signals.
4. transmission interface as claimed in claim 1; Wherein those transmission signals are identical with the bits number of those signal of video signal; When the difference of this
individual signal of video signal and this
individual signal of video signal was negative value, the individual transmission signals of this
was represented its each position with two complement codes of this difference.
5. transmission interface as claimed in claim 1, wherein the number of the handled transmission signals of each source electrode driver is all identical.
6. transmission interface as claimed in claim 1; Wherein each signal of video signal comprises a red signal of video signal, a green signal of video signal and a blue signal of video signal, and each transmission signals comprises a red transmission signals, a green transmission signals and a blue transmission signals.
7. a transmission method is used for a LCD, and this LCD comprises x source electrode driver, and this i source electrode driver is in order to handle k
iIndividual transmission signals, wherein, k
iFor greater than 1 natural number, x is a natural number, and i is 1 to x integer, and this transmission method comprises:
Receive
individual signal of video signal;
This
individual signal of video signal is made as this
individual transmission signals; Wherein, j is 1 to x integer;
With this
Individual signal of video signal and this
The difference of individual signal of video signal be made as this
Individual transmission signals, wherein, y
jBe 2 to k
jInteger; And
Those
individual transmission signals are deciphered.
8. transmission method as claimed in claim 7 also comprises:
Deliver to this j source electrode driver to this
individual transmission signals with this
after the decoding is individual; Wherein the value of this
individual transmission signals after decoding remains unchanged, and the value of this
individual transmission signals after decoding is the total value of this
individual transmission signals to this
individual transmission signals.
9. transmission method as claimed in claim 7; Wherein, Those transmission signals are identical with the bits number of those signal of video signal; When the difference of this
individual signal of video signal and this
individual signal of video signal was negative value, the individual transmission signals of this
was represented its each position with two complement codes of this difference.
10. transmission method as claimed in claim 7, wherein the number of the handled transmission signals of each source electrode driver is all identical.
11. transmission method as claimed in claim 7; Wherein, Each signal of video signal comprises a red signal of video signal, a green signal of video signal and a blue signal of video signal, and each transmission signals comprises a red transmission signals, a green transmission signals and a blue transmission signals.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101256679A CN101609652B (en) | 2008-06-17 | 2008-06-17 | Transmission interface and method for reducing power consumption and electromagnetic interference effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101256679A CN101609652B (en) | 2008-06-17 | 2008-06-17 | Transmission interface and method for reducing power consumption and electromagnetic interference effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101609652A CN101609652A (en) | 2009-12-23 |
| CN101609652B true CN101609652B (en) | 2012-12-19 |
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| CN2008101256679A Expired - Fee Related CN101609652B (en) | 2008-06-17 | 2008-06-17 | Transmission interface and method for reducing power consumption and electromagnetic interference effect |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105139812B (en) * | 2014-05-27 | 2018-01-30 | 奇景光电股份有限公司 | Data transmit and method of reseptance and data transmission system |
| CN109218748B (en) | 2017-06-30 | 2020-11-27 | 京东方科技集团股份有限公司 | Video transmission method, device and computer readable storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276570A (en) * | 2000-07-21 | 2000-12-13 | 北京国联慧光网络信息技术有限公司 | Device and method for transmitting multimedia information and high-definition narrow-band wide image over Internet |
| US6288581B1 (en) * | 2001-01-05 | 2001-09-11 | Pericom Semiconductor Corp. | Low-voltage differential-signalling output buffer with pre-emphasis |
| CN1411664A (en) * | 1999-12-22 | 2003-04-16 | 爱慕特尔有限公司 | System for moving image transmitting/receiving using wireless communication and method of same |
| CN1450816A (en) * | 2003-04-22 | 2003-10-22 | 上海大学 | Stereo video stream coder/decoder and stereo video coding/decoding system |
| CN1725277A (en) * | 2005-05-24 | 2006-01-25 | 广辉电子股份有限公司 | Display panel |
-
2008
- 2008-06-17 CN CN2008101256679A patent/CN101609652B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1411664A (en) * | 1999-12-22 | 2003-04-16 | 爱慕特尔有限公司 | System for moving image transmitting/receiving using wireless communication and method of same |
| CN1276570A (en) * | 2000-07-21 | 2000-12-13 | 北京国联慧光网络信息技术有限公司 | Device and method for transmitting multimedia information and high-definition narrow-band wide image over Internet |
| US6288581B1 (en) * | 2001-01-05 | 2001-09-11 | Pericom Semiconductor Corp. | Low-voltage differential-signalling output buffer with pre-emphasis |
| CN1450816A (en) * | 2003-04-22 | 2003-10-22 | 上海大学 | Stereo video stream coder/decoder and stereo video coding/decoding system |
| CN1725277A (en) * | 2005-05-24 | 2006-01-25 | 广辉电子股份有限公司 | Display panel |
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|---|---|
| CN101609652A (en) | 2009-12-23 |
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