WO2015029636A1 - キャリブレーション装置,キャリブレーション機能付き画像表示装置 - Google Patents
キャリブレーション装置,キャリブレーション機能付き画像表示装置 Download PDFInfo
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- WO2015029636A1 WO2015029636A1 PCT/JP2014/069035 JP2014069035W WO2015029636A1 WO 2015029636 A1 WO2015029636 A1 WO 2015029636A1 JP 2014069035 W JP2014069035 W JP 2014069035W WO 2015029636 A1 WO2015029636 A1 WO 2015029636A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G5/006—Details of the interface to the display terminal
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G5/006—Details of the interface to the display terminal
- G09G5/008—Clock recovery
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0693—Calibration of display systems
Definitions
- the present invention relates to a calibration device and an image display device with a calibration function.
- Japanese Unexamined Patent Application Publication No. 2009-047877 discloses a chip-on-glass (COG) type display module.
- the COG type display module arranges a plurality of driving devices and wirings on a glass substrate. Since the wiring on the glass substrate has a higher resistance than the wiring on the normal PCB, there is a problem that the signal quality is greatly deteriorated due to the wiring, and the characteristic variation of each wiring is large.
- an object of the present invention is to provide a calibration device that optimizes transmission characteristics for each wiring in a display module (in particular, a COG type display module), and a display module equipped with such a calibration device. .
- the transmission device becomes a master and grasps the transmission status to control the entire transmission system including the driver, which makes it easy even if there are variations in wiring characteristics. Based on the knowledge that it can be adjusted.
- the timing controller transmits a calibration pattern in a high-speed lane. Then, the data received by the driver is returned on the low-speed channel. The timing controller receives this data, and the calibration engine of the timing controller determines the reception status of the driver. The calibration engine adjusts the strength and timing on the timing controller side, the equalizer on the driver side, and the CDR timing according to the analysis status.
- FIG. 1st aspect of this invention is related with the transmitter 1 which has the 1st transmission part 11, the data generation part 13, and the calibration engine 15.
- FIG. An example of the transmission device 1 is a timing controller used in an image display device or the like.
- the first transmission unit 11 is an element for transmitting data to the reception device 41 via the first wiring 31.
- the data generation unit 13 is an element that generates data to be transmitted by the first transmission unit 11.
- the calibration engine 15 is an element for controlling a calibration signal generated by the data generation unit 13.
- the calibration engine 15 controls the calibration signal generated by the data generation unit 13 so that the calibration signal is shifted in timing by a predetermined timing amount with respect to the clock bit embedded in the data.
- the data generation unit 13 that has received a command for controlling the calibration signal generates a calibration signal at an appropriate timing.
- the predetermined timing amount is an amount by which the receiving device 41 can sample the edge portion of the data, and a specific example is 0.5 bits.
- a preferred example of this transmission device further includes a first reception unit 17 that receives data received by the reception device 41.
- the calibration engine 15 has a timing adjustment command generation unit 21.
- the timing adjustment command generation unit 21 is an element that generates a timing adjustment command for adjusting the timing of the calibration signal generated by the data generation unit 13. Then, the data generation unit 13 adjusts the data timing based on the timing adjustment command received from the timing adjustment command generation unit 21.
- a preferred example of this transmission apparatus further includes a first intensity adjustment unit 23, and the calibration engine 15 further includes an edge analysis unit 19 and a first intensity adjustment command generation unit 25.
- the edge analysis unit 19 is an element that analyzes the edge portion of the received calibration signal when the first reception unit 17 receives information on the calibration signal.
- the first intensity adjustment unit 23 is an element that adjusts the intensity of data transmitted by the first transmission unit 11.
- the intensity adjustment command generation unit 25 is an element that generates a first intensity adjustment command related to the intensity adjusted by the first intensity adjustment unit 23 based on the information on the edge portion of the calibration signal analyzed by the edge analysis unit 19. is there. Then, the first intensity adjustment unit 23 adjusts the intensity of the data transmitted by the first transmission unit 11 based on the first intensity adjustment command from the first intensity adjustment command generation unit 25.
- the second aspect of the present invention relates to the transmission device described above, the transmission / reception device including the reception device 41 and the second wiring 61.
- the reception device 41 includes a second reception unit 43, a storage unit 45, and a second transmission unit 47.
- the second receiving unit 43 is an element that receives data that has passed through the first wiring 31.
- the storage unit 45 is an element that stores data received by the data receiving unit 43.
- the second transmission unit 47 is an element that transmits the data stored in the storage unit 45 to the first reception unit 17 via the second wiring 61.
- the receiving apparatus further includes a decoder section 48 for determining whether or not the data received by the second receiving section 43 is a calibration signal.
- the receiving device 41 further includes a second intensity adjusting unit 49 and a clock / data recovery unit 51.
- the calibration engine 15 of the transmission device 1 includes a second intensity adjustment command generation unit 27 and a CDR adjustment unit 29.
- the second intensity adjustment unit 49 is an element that adjusts the intensity of data received by the second reception unit 43.
- the clock / data recovery unit 51 is an element that restores the clock and data from the data received by the second reception unit 43.
- the second intensity adjustment command generation unit 27 is an element that generates the intensity adjustment command of the second intensity adjustment unit 49 based on the information on the edge portion of the calibration signal analyzed by the edge analysis unit 19.
- the CDR adjustment unit 29 is an element that generates a data-clock skew adjustment command of the clock / data recovery unit 51. Then, the second intensity adjustment unit 49 adjusts the intensity of the data received by the second reception unit 43 based on the intensity adjustment command that has passed through the first transmission unit 11 and the second reception unit 43. The clock / data recovery unit 51 restores the clock of the data received by the second reception unit 43 based on the data-clock skew adjustment command that has passed through the first transmission unit 11 and the second reception unit 43. .
- the third aspect of the present invention relates to an image display device having any of the above-described transmission / reception devices and an image display unit 71 for displaying an image based on data received by the second reception unit 43.
- the present invention can provide a calibration device that optimizes the transmission characteristics for each wiring in a display module (particularly a COG type display module), and a display module equipped with such a calibration device.
- FIG. 1 is a block diagram for explaining a transmitting / receiving apparatus of the present invention.
- FIG. 2 is a block diagram illustrating a configuration of the transmission device and the reception device according to the embodiment.
- FIG. 3 is a diagram illustrating a format of data transmitted from the transmission apparatus and received by the reception apparatus in the embodiment.
- FIG. 4 is a diagram illustrating data transmitted from the transmission apparatus and received by the reception apparatus in the present embodiment.
- FIG. 5 is a diagram comparing the timing of normal data transmitted from the transmission device in the embodiment and received by the reception device and the sampling clock inside the reception device for analysis data.
- FIG. 1 is a block diagram for explaining a transmitting / receiving apparatus of the present invention.
- FIG. 2 is a block diagram illustrating a configuration of the transmission device and the reception device according to the embodiment.
- FIG. 3 is a diagram illustrating a format of data transmitted from the transmission apparatus and received by the reception apparatus in the embodiment.
- FIG. 4 is a diagram illustrating data transmitted from the transmission apparatus and
- FIG. 6 shows data transmitted from the transmission device to the reception device, storage of calibration data in the storage unit in the reception device, return of data transmission by the transmission unit, and control of the corresponding unit of the reception device from the control unit It is a figure which shows the timing of.
- FIG. 7 shows an outline of analysis data for determining whether transmission device pre-equalization or reception device equalization is excessive or insufficient, and (a), transmission path for transmission device pre-equalization and reception device equalization excess or shortage.
- FIG. 6B is a diagram showing the relationship between the analysis data that is distorted by the sampling clock and the sampling clock (indicated by an arrow in the figure) in the clock / data recovery unit.
- FIG. 8 is a correspondence table of analysis sampled data sampled by the clock / data recovery unit of the receiving device and determination of the control unit of the transmitting device when adjusting the pre-equalization of the transmitting device and the equalization of the receiving device.
- FIG. 9 is a diagram for explaining a method in which the control unit determines the phase relationship between the data and the sampling clock in the clock / data recovery unit.
- FIG. 10 shows a correspondence table of analysis sampled data sampled by the clock / data recovery unit of the receiving apparatus and determination of the control unit of the transmitting apparatus at the time of adjusting the skew between the data in the clock / data recovery unit and the sampling clock.
- FIG. 11 is a diagram illustrating an overall flow of auto-calibration according to the embodiment.
- FIG. 12 is a flowchart of the data and clock skew adjustment of the clock recovery unit of the receiving device by the control unit of the transmitting device in the embodiment.
- FIG. 13 is a flowchart for adjusting the intensity of pre-equalization of the transmission apparatus and the intensity of equalization of the reception apparatus by the control unit of the transmission apparatus in the embodiment.
- FIG. 14 is a diagram illustrating a method of generating a reference clock output to the flip-flop by the phase shift unit.
- FIG. 15 is a diagram illustrating a method for realizing how to change the strength of pre-equalization in the buffer of the transmission apparatus.
- FIG. 16 is a diagram illustrating a method of realizing how to change the equalization intensity in the input buffer unit of the receiving apparatus.
- FIG. 1 is a block diagram for explaining a transmitting / receiving apparatus of the present invention.
- the transmission device 1 of the present invention includes a first transmission unit 11, a data generation unit 13, and a calibration engine 15.
- An example of the transmission device 1 is a timing controller used in an image display device or the like.
- the first transmission unit 11 is an element for transmitting data to the reception device 41 via the first wiring 31.
- the data generation unit 13 is an element that generates data to be transmitted by the first transmission unit 11.
- the calibration engine 15 is an element for controlling a calibration signal generated by the data generation unit 13.
- the calibration engine 15 controls the calibration signal generated by the data generation unit 13 so that the calibration signal is shifted in timing by a predetermined timing amount with respect to the clock bit embedded in the data.
- the data generation unit 13 that has received a command for controlling the calibration signal generates a calibration signal at an appropriate timing.
- the predetermined timing amount is an amount by which the receiving device 41 can sample the edge portion of the data, and a specific example is 0.5 bits.
- a preferred example of this transmission device further includes a first reception unit 17 that receives data received by the reception device 41.
- the calibration engine 15 has a timing adjustment command generation unit 21.
- the calibration engine 15 may have an edge analysis unit 19 as will be described later.
- the timing adjustment command generation unit 21 is an element that generates a timing adjustment command for adjusting the timing of the calibration signal generated by the data generation unit 13 in order to analyze the reception status at the transmission device 41.
- the timing adjustment command generation unit 21 may adjust the timing of the calibration signal based on the analysis result by the edge analysis unit 19. Then, the data generation unit 13 adjusts the data timing based on the timing adjustment command received from the timing adjustment command generation unit 21.
- a preferred example of this transmission apparatus further includes a first intensity adjustment unit 23, and the calibration engine 15 further includes an edge analysis unit 19 and an intensity adjustment command generation unit 25.
- the first intensity adjustment unit 23 is an element that adjusts the intensity of data transmitted by the first transmission unit 11.
- the edge analysis unit 19 is an element that analyzes the edge portion of the received calibration signal when the first reception unit 17 receives information on the calibration signal.
- the intensity adjustment command generation unit 25 is an element that generates a first intensity adjustment command related to the intensity adjusted by the first intensity adjustment unit 23 based on the information on the edge portion of the calibration signal analyzed by the edge analysis unit 19. is there. Then, the first intensity adjustment unit 23 adjusts the intensity of data transmitted by the first transmission unit 11 based on the first intensity adjustment command from the intensity adjustment command generation unit 25.
- the second aspect of the present invention relates to the transmission device described above, the transmission / reception device including the reception device 41 and the second wiring 61.
- the reception device 41 includes a second reception unit 43, a storage unit 45, and a second transmission unit 47.
- the second receiving unit 43 is an element that receives data that has passed through the first wiring 31.
- the storage unit 45 is an element that stores data received by the data receiving unit 43.
- the second transmission unit 47 is an element that transmits the data stored in the storage unit 45 to the first reception unit 17 via the second wiring 61.
- the receiving apparatus further includes a decoder section 48 for determining whether or not the data received by the second receiving section 43 is a calibration signal.
- the receiving device 41 further includes a second intensity adjusting unit 49 and a clock / data recovery unit 51.
- the calibration engine 15 of the transmission device 1 includes a second intensity adjustment command generation unit 27 and a CDR adjustment unit 29.
- the second intensity adjustment unit 49 is an element that adjusts the intensity of data received by the second reception unit 43.
- the clock / data recovery unit 51 is an element that restores the clock and data from the data received by the second reception unit 43.
- the second intensity adjustment command generation unit 27 is an element that generates the intensity adjustment command of the second intensity adjustment unit 49 based on the information on the edge portion of the calibration signal analyzed by the edge analysis unit 19.
- the adjustment unit 29 is an element that generates a data-clock skew adjustment command of the clock / data recovery unit 51. Then, the second intensity adjustment unit 49 adjusts the intensity of the data received by the second reception unit 43 based on the intensity adjustment command that has passed through the first transmission unit 11 and the second reception unit 43. In addition, the clock / data recovery unit 51 adjusts its own data-clock skew based on the data-clock skew adjustment command that has passed through the first transmission unit 11 and the second reception unit 43, and performs the second reception. The clock and data are restored from the data received by the unit 43.
- the third aspect of the present invention relates to an image display device having any of the above-described transmission / reception devices and an image display unit 71 for displaying an image based on data received by the second reception unit 43.
- FIG. 2 is a block diagram illustrating the configuration of the transmission device 110 and the reception device 120 of the present embodiment.
- the transmission device 110 includes a reception unit 111, a control unit 112, a clock generation unit 113, and a transmission unit 114.
- the transmission unit 114 of the transmission device 110 includes an encoder unit 213, a flip-flop unit 212, an output buffer unit 211, and a phase shift unit 214.
- the receiving apparatus 120 includes an input buffer unit 121, a clock / data recovery (CDR) unit 122, a decoder unit 123, a storage unit 124, and a transmission unit 125.
- CDR clock / data recovery
- the encoder unit 213 of the transmission device 110 converts multi-bit parallel data such as image display data input in response to an instruction from the control unit 112 and data necessary for calibration into 1-bit serial data, and a flip-flop unit. To 212.
- the clock generation unit 113 outputs a reference clock that generates the output timing of the output data to the phase shift unit 214.
- the phase shift unit 214 receives the reference clock output from the clock generation unit 113, changes the phase of the reference clock by the phase shift amount instructed by the control unit 112, and outputs it to the flip-flop unit 212.
- the flip-flop unit 212 adjusts the data output from the encoder unit 213 to the timing indicated by the clock output from the phase shift unit 214 and outputs the data to the output buffer unit 211.
- the output buffer unit 211 adjusts the intensity of pre-equalization instructed by the control unit 112 with respect to the data output from the flip-flop unit 212 and transmits the adjusted data to the receiving device 120.
- the reception unit 111 of the transmission device 110 receives data transmitted from the transmission unit 125 of the reception device 120 and outputs the data to the control unit 112.
- the control unit 112 of the transmission device 110 controls both the transmission device 110 and the reception device 120. Details will be described after each block.
- the input buffer unit 121 of the receiving device 120 receives the data transmitted from the transmitting device 110, shapes the input waveform according to the equalization intensity setting, and outputs it to the clock / data recovery unit 122.
- the input buffer unit 121 has a plurality of equalization strength settings, and changes the equalization strength according to an instruction from the control unit 112.
- the clock / data recovery unit 122 receives data from the input buffer unit 121, extracts a clock and data from the data, and outputs the extracted data and clock to the decoder unit 123.
- the decoder unit 123 identifies the type of data output from the clock / data recovery unit 122.
- the data output from the clock / data recovery unit 122 is normal data used for image display in the subsequent image display unit, the data is output to the subsequent step.
- the decoder unit 123 outputs the data to the storage unit 124.
- the decoder unit 123 outputs the data to the corresponding block.
- the storage unit 124 stores the data in accordance with an instruction from the decoder unit 123.
- the transmission unit 125 of the reception device 120 transmits the data output from the storage unit 124 to the transmission device 110.
- the control unit 112 controls data transmission by the data transmission unit 114. Specifically, the control unit 112 controls data output from the encoder unit 213. The control unit 112 also controls the phase shift unit 214 in order to analyze the data reception status at the receiving device 120. Further, the control unit 112 controls the strength of pre-equalization of data transmitted from the output buffer 211 of the data transmission unit 114 based on the data received by the reception unit 111.
- the control unit 112 also controls the data reception by the input buffer unit 121 and the clock / data recovery unit 122 of the receiving device 120.
- the control unit 112 controls the intensity of waveform equalization in the input buffer unit 121 of the receiving device 120 by transmitting data for controlling the receiving device 120 from the transmitting device 110 based on the data received by the receiving unit 111.
- the control unit 112 adjusts the skew between the data and the sampling clock in the clock / data recovery unit 122 by transmitting data for controlling the reception device 120 from the transmission device 110 based on the data received by the reception unit 111.
- the control unit 112 controls the pre-equalization strength of data transmitted from the output buffer 211 of the transmission unit 114, the equalization strength of the input buffer unit 121 of the reception device 120, and the clock / data recovery unit 122 of the reception device 120. Although it is desirable to control all of the skews, any one or more of these may be controlled.
- FIG. 3 shows a format of data transmitted from the transmission device 110 and received by the reception device 120 in this embodiment.
- a clock bit of “01” is embedded at regular intervals so that the receiving device 120 can extract the clock and data from the data transmitted from the transmitting device 110.
- “1” of D [0] and “0” of D [n ⁇ 1] correspond to clock bits.
- the rising edge by this clock bit is called a reference edge.
- the clock / data recovery unit 122 of the receiving device 120 generates a sampling clock for sampling the input data with reference to the reference edge received at regular intervals by the clock bits, and latches the input data.
- Examples of data output from the data transmission unit 114 when the encoder unit 213 is controlled by the control unit 112 include data used for image display in the image display unit, and data reception status in the clock / data recovery unit 122 of the reception device 120 Analysis start data indicating the start of analysis, analysis data used for actual analysis, and transmission instruction data instructing that the reception device 120 transmits data obtained by sampling the analysis data from the transmission unit 125 of the reception device 120 , Control data used for setting the waveform equalization intensity in the input buffer unit 121 of the receiving device 120 and the skew adjustment in the clock / data recovery unit 122, and a dummy to be sent during a period when no particularly meaningful data needs to be sent from the receiving device 120 There are 6 types of data. Kicking become two data for calibration used for normal data and calibration period used for image display.
- FIG. 4 is a diagram illustrating data transmitted from the transmission device 110 and received by the reception device 120 in the present embodiment.
- FIG. 4A shows normal data
- FIG. 4B shows calibration data.
- the calibration data includes analysis start data indicating the start of calibration, analysis data, transmission start data, control data, and dummy data. Discrimination between normal data and calibration data is performed based on the polarity of the D [1] bit. In the embodiment, when the D [1] bit is 0, normal data is used, and when the D [1] bit is 1, calibration data is used. The position of the determination bit may not be D [1], and the polarity may be reversed.
- Analysis start data, transmission start data, control data, and dummy data are transmitted by the same bit continuously for 3 bits or more so that the reception device 120 can receive correctly even when the reception state of the reception device 120 is not optimal. It is made to recognize.
- the analysis data is not limited to this because it determines the transmission status according to this reception status.
- FIG. 5 is a diagram comparing the timing of normal data transmitted from the transmission device 110 and received by the reception device 120 in the embodiment and the sampling clock inside the reception device 120 for analysis data.
- Figure (a) shows normal data
- Figure (b) shows analysis data.
- a clock for sampling normal data transmitted from the transmitter 110 and received by the receiver 120 (“receiver internal clock” in the figure) is based on the reference edge as shown in FIG. And is controlled by the clock and data recovery unit 122 so that the middle of the data can be sampled.
- the analysis data received by the receiving device 120 is a data transition (edge) portion generated based on the reference edge received by the receiving device 120. It is comprised so that it may be located in.
- the control unit 112 transmits the analysis data as it is compared with the case of transmitting the normal data, the analysis start data, the transmission start data, the control data, and the dummy data.
- a pattern in which bits are shifted by 0.5 bits relative to the reference edge is transmitted.
- the receiving device 120 operates in exactly the same way as when receiving normal data, and can sample data transitions when receiving analysis data.
- control unit pre-equalizes the transmission device 110 and equalizes the reception device 120 using analysis sampled data obtained by sampling the analysis data transmitted from the transmission device 110 with reference to FIGS. A method for determining excess or deficiency will be described.
- FIG. 7A shows an outline of analysis data for determining whether the transmission device 110 is pre-equalized and whether the reception device 120 is equalized or not.
- FIG. 7B shows the pre-equalization of the transmission device 110 and the reception device 120. This shows the relationship between the analysis data distorted by the transmission line and the sampling clock in the clock / data recovery unit 122 (indicated by an arrow in the figure) for excess and deficiency of equalization.
- a state where the combination of the pre-equalization of the transmission device 110 and the equalization of the reception device 120 is too weak is expressed as “under equalize” in the figure
- the optimal state is expressed as “optimal” in the figure
- the state that is too strong is indicated as “over” in the figure. "Equalize”.
- the clock for sampling each bit generated by the clock recovery unit of the receiving device 120 is generated based on the reference edge that is the rising edge of the clock bit. Furthermore, since the dullness of the waveform affects the timing of the previous bit with the previous bit, the pattern near the clock bit and the pattern near the bit used to determine the reception status (only the D [x] bit in the figure) If they are different, the relative position of the sampling clock and data changes. From the change in the relative position, it is possible to determine the effect of the waveform dullness, the pre-equalization of the transmission device 110, and the equalization of the reception device 120.
- the analysis data has a pattern in which the same bits continue in the vicinity of the clock bits, and the bits (only D [x] bits in the figure) used in determining the reception status are such that the bits are inverted immediately before. It consists of patterns.
- a bit that becomes “0” in a pattern such as “101” that changes rapidly in an under-equalized state where the waveform becomes dull due to the transmission line and weakly pre-equalized and equalized reaches the correct “0” logic level. Since it returns to “1” before, D [x] sampling the transition is determined to be “1”.
- FIG. 8 shows the analysis sampled data sampled by the clock / data recovery unit 122 of the receiving device 120 and the control unit of the transmitting device 110 when the pre-equalization of the transmitting device 110 and the equalization of the receiving device 120 are adjusted.
- the correspondence table of the determination of 112 is shown.
- the control unit 112 of the transmission device 110 uses the analysis sampled data returned from the reception device 120 based on the determination criteria as shown in FIG. And go to the best place.
- a sampling result of only 1 bit for one analysis data is returned as analysis sampled data by the transmission unit 125 of the reception device 120 to the transmission device 110, and the control unit 112 makes a determination based on this data. Is going.
- multi-bit results of one analysis data may be used.
- control unit 112 of the transmission apparatus 110 that has received the analysis sampled data obtained by sampling the analysis data transmitted from the transmission apparatus 110 with reference to FIG. A method for determining the phase relationship will be described.
- the clock for sampling each bit generated by the clock / data recovery unit 122 of the receiving device 120 is generated based on the reference edge of the clock bit as in the case of detecting the dullness of the waveform.
- the influence of intersymbol interference in which the previous bit due to the above-mentioned waveform dullness affects the timing of the subsequent bit. It needs to be negligible. This is achieved by making the pattern near the clock bit and the pattern near the bit used to determine the phase difference (in the figure, only D [x] bit) the same. As a result, external factors such as waveform dullness are canceled, so that it is possible to detect the skew between the data generated in the clock / data recovery unit 122 and the sampling clock.
- the analysis data has a pattern in which the same bits follow the clock bits, bits used to determine the skew between the data in the clock / data recovery unit 122 and the sampling clock (only D [x] bits in the figure) ) Is composed of the same pattern as the vicinity of the clock bit.
- sampling clock is more phased than the data (the case in the left of the figure (b))
- the sampling result is always “0”
- the phase of the sampling clock is behind the data (the right of the figure (b))
- the sampling result is always “1”. If the sampling clock and data are in phase, “1” and “0” are sampled at the same frequency.
- FIG. 10 shows the analysis sampled data sampled by the clock / data recovery unit 122 of the receiving device 120 and the determination of the control unit 112 of the transmitting device 110 when adjusting the skew between the data in the clock / data recovery unit 122 and the sampling clock. Is a correspondence table.
- the control unit 112 of the transmission device 110 determines the phase relationship between the data and the sampling clock from the analysis sampled data returned from the reception device 120 based on the determination criteria as shown in FIG. I ’ll take it somewhere.
- the transmission unit 114 of the transmission device 110 Under the control of the control unit 112, the transmission unit 114 of the transmission device 110 detects normal data (indicated as “normal” in the drawing) used for image display in the image display unit and a data reception state in the reception device 120.
- Analysis data (denoted as “CA” in the figure), analysis start data indicating the start of this data (denoted as “analysis start” in the figure), and clock / data recovery unit 122 stored in the storage unit 124
- Transmission instruction data (designated as “transmission instruction” in the figure) for instructing the timing at which analysis sampled data obtained by sampling the analysis data is transmitted from the transmission unit 125 of the reception device 120, is transmitted from the transmission unit 125 of the transmission device 110.
- the control unit 112 Based on the analyzed sampled data, the control unit 112 receives data in the clock / data recovery unit 122 of the receiving device 120. (In the figure "CC" hereinafter) analysis of the state control data for controlling the corresponding block of the receiving apparatus 120 based on transmission to the receiving apparatus 120, the respective data at a predetermined timing.
- the transmission device 110 provides a calibration period in a period other than normal data used for image display, such as when power is turned on or when image data is blanked, and transmits analysis start data, analysis data, transmission instruction data, and control data.
- Dummy data (denoted as “dummy” in the figure) is transmitted during a period when data need not be transmitted from the transmission unit 114, such as when receiving analysis sampled data from the receiving device 120.
- the storage unit 124 stores analysis sampled data obtained by sampling the analysis data received thereafter. To do. If the decoder unit 123 determines that the received data is transmission start data, the sampled data stored in the storage unit 124 is transmitted from the transmission unit 125. Further, when the decoder unit 123 determines that the received data is control data for controlling each block, the control of the corresponding block is controlled according to the contents of the control data.
- the storage unit 124 may store all of the analysis sampled data obtained by sampling the analysis data by the clock / data recovery unit 122, but may store a part of the analysis sampled data or an operation such as integration. May be stored.
- the data of the clock / data recovery unit 122 of the receiving device 120, the skew adjustment between clocks, the pre-equalization of the transmitting device 110, and the equalization of the receiving device 120 are performed by the control unit 112 of the transmitting device 110 with reference to FIGS.
- the flow of intensity adjustment will be described.
- FIG. 11 shows an overall flow of auto-calibration of the embodiment.
- the pre-equalization strength of the transmission device 110 and the equalization strength of the reception device 120 are adjusted.
- FIG. 12 is a flowchart of the adjustment of the data and clock skew in the clock / data recovery unit 122 of the reception device 120 by the control unit 112 of the transmission device 110 in the embodiment.
- the initial value is set.
- the previous calibration result is taken over.
- the transmission device 110 transmits analysis start data, analysis data, and transmission start data to the reception device 120, and the reception device 120 receives them and sends analysis sampled data back to the transmission device 110.
- the control unit 112 of the transmission apparatus receives this, determines the state of the data and clock-to-clock skew, and adjusts according to the following procedure based on the determination result.
- control device of the transmission device 110 determines that the phases of the clock and the data are aligned, the calibration is finished as it is. If it is determined otherwise, the following adjustments are made.
- control unit 112 of the transmission device 110 determines that the data is advanced with respect to the clock, the control unit 112 performs a control to set the data to be delayed by a predetermined value or to advance the clock by a predetermined value.
- control unit 112 of the transmission device 110 When it is determined that the data is delayed with respect to the clock, the control unit 112 of the transmission device 110 performs control to advance the data by a predetermined value or delay the clock by a predetermined value.
- control unit 112 of the transmission device 110 sends analysis start data from the transmission device 110 to the reception device 120 again, and determines that the phase of the clock and the data is aligned in a series of adjustment processes. Repeat until
- FIG. 13 is a flowchart for adjusting the pre-equalization strength of the transmission device 110 and the equalization strength of the reception device 120 by the control unit 112 of the transmission device 110 in the embodiment.
- the initial value is set.
- the previous calibration result is taken over.
- the transmission device 110 transmits analysis start data, analysis data, and transmission start data to the reception device 120, and the reception device 120 receives them and sends analysis sampled data back to the transmission device 110.
- the control unit 112 of the transmission device 110 receives this, determines the waveform shaping state by the pre-equalization of the transmission unit 114 and the equalization of the reception device 120, and adjusts according to the following procedure based on the determination result. Do.
- the control device 112 of the transmission device 110 determines that the waveform shaping state by the pre-equalization of the transmission unit 114 and the equalization of the reception device 120 is optimal, the calibration is finished as it is. If it is determined otherwise, the following adjustments are made.
- Under equalization When the control unit 112 of the transmission device 110 determines that the combination of the pre-equalization strength of the current transmission device 110 and the equalization strength of the reception device 120 is too weak and the waveform dullness cannot be corrected (in the drawing, “Under equalization”) performs control to increase the intensity of pre-equalization of the transmission apparatus 110 by a predetermined value.
- the control unit 112 of the transmission device 110 is too strong in the combination of the pre-equalization strength of the current transmission device 110 and the equalization strength of the reception device 120, so that the waveform causes overshoot and the like.
- control is performed to lower the equalization intensity of the receiving apparatus 120 by a predetermined value.
- control unit 112 of the transmission device 110 sends the analysis start data from the transmission device 110 to the reception device 120 again, and performs a series of adjustment processes in the pre-equalization of the transmission unit 114 and the reception unit 111. Repeat until the waveform shaping state due to equalization is determined to be optimal.
- FIG. 14 shows a method of generating a reference clock output to the flip-flop by the phase shift unit 214.
- FIG. 4A is a diagram showing a circuit configuration
- FIG. 4B is a timing chart.
- a multi-phase clock output from the reference clock (indicated as “reference clock_Clock_n” in the figure, n is an integer) is received, and Clock_1 is generated from a combination of the reference clock_Clock_1 and the reference clock_Clock_3.
- Clock_2 is generated from the combination of the reference clock_Clock_m and the reference clock_Clock_m + 2 that are 0.5 bits out of phase with the reference clock 1. Therefore, Clock_1 and Clock_2 have a phase relationship in which the phases are shifted from each other by 0.5 bits.
- Clock_1 is output as a reference clock, and when data shifted by 0.5 bits of analysis data is output, by selecting Clock_2 shifted by 0.5 bits from Clock_1 by the select signal, the output clock is set to 0.5. A bit slower.
- FIG. 15 shows a method for realizing how to change the strength of pre-equalization in the buffer of the transmission apparatus 110.
- A shows the circuit configuration
- (b) shows the truth table when changing the pre-equalization intensity
- (c) shows the output waveform.
- Pre-equalization predicts that the waveform output from the buffer will be dull and deteriorated due to the influence of the transmission path, etc., and emphasizes the high-frequency component of the waveform that is most easily affected in advance.
- child buffers having different output intensities are arranged in parallel, and when these child buffers are turned on and off by a certain amount for a certain period, there is a change from the previous bit as shown in FIG.
- a desired waveform is generated to reduce the amplitude of the same bit as the previous bit with respect to the amplitude.
- FIG. 16 shows a method of realizing how to change the equalization intensity in the input buffer unit 121 of the receiving apparatus 120.
- FIG. 4A shows the circuit configuration
- FIG. 4B shows the frequency characteristics of the input buffer unit 121 by setting.
- the equalization is performed by reshaping the high-frequency component of the waveform that has been dull and deteriorated due to the influence of the transmission line or the like input to the input buffer unit 121 to reshape the waveform so that the subsequent clock / data recovery unit 122 can easily receive the waveform.
- Technology In the embodiment, by using a circuit as shown in FIG. 6A and changing the value of resistance or capacitance, different frequency characteristics are realized as shown in FIG. This resistance value or capacitance value is changed in accordance with an instruction from the control unit 112 of the transmission device 110.
- the present invention can be used in the electrical equipment industry.
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Abstract
Description
そして,キャリブレーションエンジン15は,タイミング調整指令生成部21を有するものである。
タイミング調整指令生成部21は,データ生成部13が生成するキャリブレーション信号のタイミングを調整するためのタイミング調整指令を生成する要素である。
そして,データ生成部13は,タイミング調整指令生成部21から受け取ったタイミング調整指令に基づいてデータのタイミングを調整する。
第1の強度調整部23は,第1の送信部11が送信するデータの強度を調整する要素である。
強度調整指令生成部25は,エッジ解析部19が解析したキャリブレーション信号のエッジ部分の情報に基づいて,第1の強度調整部23が調整する強度に関する第1の強度調整指令を生成する要素である。
そして,第1の強度調整部23は,第1の強度調整指令生成部25からの第1の強度調整指令に基づいて,第1の送信部11が送信するデータの強度を調整する。
そして,受信装置41は,第2の受信部43と,記憶部45と,第2の送信部47とを有する。
第2の受信部43は,第1の配線31を経たデータを受信する要素である。
記憶部45は,データ受信部43が受信したデータを記憶する要素である。
第2の送信部47は,記憶部45が記憶したデータを第2の配線61を経て第1の受信部17へ送信する要素である。
第2の強度調整部49は,第2の受信部43が受信したデータの強度を調整する要素である。
クロック・データリカバリ部51は,第2の受信部43が受信したデータからクロックとデータを復元する要素である。
第2の強度調整指令生成部27は,エッジ解析部19が解析したキャリブレーション信号のエッジ部分の情報に基づいて,第2の強度調整部49の強度調整指令を生成する要素である。
CDR調整部29は,クロック・データリカバリ部51のデータ-クロック間スキュー調整指令を生成する要素である。
そして,第2の強度調整部49は,第1の送信部11及び第2の受信部43を経た強度調整指令に基づいて,第2の受信部43が受信したデータの強度を調整する。
また,クロック・データリカバリ部51は,第1の送信部11及び第2の受信部43を経たデータ-クロック間スキュー調整指令に基づいて第2の受信部43が受信したデータのクロックを復元する。
そして,キャリブレーションエンジン15は,タイミング調整指令生成部21を有するものである。キャリブレーションエンジン15は,後述するように,エッジ解析部19を有していてもよい。
タイミング調整指令生成部21は,送信装置41での受信状況を分析するためにデータ生成部13が生成するキャリブレーション信号のタイミングを調整するためのタイミング調整指令を生成する要素である。タイミング調整指令生成部21は,エッジ解析部19による解析結果に基づいて,キャリブレーション信号のタイミングを調整しても良い。
そして,データ生成部13は,タイミング調整指令生成部21から受け取ったタイミング調整指令に基づいてデータのタイミングを調整する。
そして,第1の強度調整部23は,強度調整指令生成部25からの第1の強度調整指令に基づいて,第1の送信部11が送信するデータの強度を調整する。
そして,受信装置41は,第2の受信部43と,記憶部45と,第2の送信部47とを有する。
第2の受信部43は,第1の配線31を経たデータを受信する要素である。
記憶部45は,データ受信部43が受信したデータを記憶する要素である。
第2の送信部47は,記憶部45が記憶したデータを第2の配線61を経て第1の受信部17へ送信する要素である。
第2の強度調整部49は,第2の受信部43が受信したデータの強度を調整する要素である。
クロック・データリカバリ部51は,第2の受信部43が受信したデータからクロックとデータを復元する要素である。
第2の強度調整指令生成部27は,エッジ解析部19が解析したキャリブレーション信号のエッジ部分の情報に基づいて,第2の強度調整部49の強度調整指令を生成する要素である。
そして,第2の強度調整部49は,第1の送信部11及び第2の受信部43を経た強度調整指令に基づいて,第2の受信部43が受信したデータの強度を調整する。
また,クロック・データリカバリ部51は,第1の送信部11及び第2の受信部43を経たデータ-クロック間スキュー調整指令に基づいて自身のデータ-クロック間スキューを調整し,第2の受信部43が受信したデータからクロックとデータを復元する。
11 第1の送信部
13 データ生成部
15 キャリブレーションエンジン
17 第1の受信部
19 エッジ解析部
21 タイミング調整指令生成部
23 第1の強度調整部
25 強度調整指令生成部
27 第2の強度調整指令生成部
29 CDR調整部
31 第1の配線
41 受信装置
43 第2の受信部
45 記憶部
47 第2の送信部
48 デコーダ部
49 第2の強度調整部
51 クロック・データリカバリ部
61 第2の配線
71 画像表示部
Claims (8)
- 第1の配線(31)を介して,受信装置(41)へデータを送信するための第1の送信部(11)と,
第1の送信部(11)が送信するデータを生成するデータ生成部(13)と,
前記データ生成部(13)が生成するキャリブレーション信号を制御するためのキャリブレーションエンジン(15)と,
を有する送信装置であって,
前記キャリブレーションエンジン(15)は,
前記キャリブレーション信号が,データに埋め込まれているクロックビットに対して所定のタイミング量だけタイミングをずれるようにデータ生成部(13)が生成するキャリブレーション信号を制御する,
送信装置(1)。
- 請求項1に記載の送信装置であって,前記所定のタイミング量は,前記受信装置(41)が前記データのエッジ部分をサンプリングできる量である,送信装置。
- 請求項1に記載の送信装置であって,
前記受信装置(41)が受信したデータを受け取る第1の受信部(17)をさらに有し,
前記データ生成部(13)が生成するキャリブレーション信号のタイミングを調整するためのタイミング調整指令を生成するタイミング調整指令生成部(21)を有し,
前記データ生成部(13)は,前記タイミング調整指令生成部(21)から受け取ったタイミング調整指令に基づいてデータのタイミングを調整する,
送信装置。
- 請求項2に記載の送信装置であって,
第1の送信部(11)が送信するデータの強度を調整する第1の強度調整部(23)をさらに有し,
前記キャリブレーションエンジン(15)は,
前記キャリブレーションエンジン(15)は,第1の受信部(17)がキャリブレーション信号に関する情報を受け取った場合に,受け取ったキャリブレーション信号のエッジ部分を解析するエッジ解析部(19)と,
前記エッジ解析部(19)が解析したキャリブレーション信号のエッジ部分の情報に基づいて,第1の強度調整部(23)が調整する強度に関する第1の強度調整指令を生成する強度調整指令生成部(25)をさらに有し,
第1の強度調整部(23)は,前記強度調整指令生成部(25)からの第1の強度調整指令に基づいて,第1の送信部(11)が送信するデータの強度を調整する,
送信装置。
- 請求項3又は請求項4に記載の送信装置と,前記受信装置(41)と第2の配線(61)を含む送受信装置であって,
前記受信装置(41)は,
第1の配線(31)を経たデータを受信する第2の受信部(43)と,
前記データ受信部(43)が受信したデータを記憶する記憶部(45)と,
前記記憶部(45)が記憶したデータを第2の配線(61)を経て第1の受信部(17)へ送信するための第2の送信部(47)と,
を有する,
送受信装置。
- 請求項5に記載の送受信装置であって,前記受信装置は,第2の受信部(43)が受信したデータがキャリブレーション信号か否か判別するデコーダ部(48)をさらに有する,送受信装置。
- 請求項3に記載の送受信装置であって,
前記受信装置(41)は,
第2の受信部(43)が受信したデータの強度を調整する第2の強度調整部(49)と,
第2の受信部(43)が受信したデータのクロックを復元するためのクロック・データリカバリ部(51)と,をさらに有し,
前記キャリブレーションエンジン(15)は,前記エッジ解析部(19)が解析したキャリブレーション信号のエッジ部分の情報に基づいて,第2の強度調整部(49)の強度調整指令を生成する第2の強度調整指令生成部(27)と,
及び前記クロック・データリカバリ部(51)のデータ-クロック間スキュー調整指令を生成するためのCDR調整部(29)と,を有し,
第2の強度調整部(49)は,第1の送信部(11)及び第2の受信部(43)を経た前記強度調整指令に基づいて,第2の受信部(43)が受信したデータの強度を調整し,
前記クロック・データリカバリ部(51)は,第1の送信部(11)及び第2の受信部(43)を経た前記データ-クロック間スキュー調整指令に基づいてデータ-クロック間スキューを調整し,第2の受信部(43)が受信したデータからクロックとデータを復元する,
送受信装置。
- 請求項5~7のいずれかに記載の送受信装置と,
第2の受信部(43)が受信したデータに基づいて画像表示を行うための画像表示部(71)と,
を有する画像表示装置。
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JP2010258671A (ja) * | 2009-04-23 | 2010-11-11 | Thine Electronics Inc | 送信装置、受信装置、送受信システムおよび画像表示システム |
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JP2010258671A (ja) * | 2009-04-23 | 2010-11-11 | Thine Electronics Inc | 送信装置、受信装置、送受信システムおよび画像表示システム |
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