JP6616341B2 - Display panel driver setting method and display device - Google Patents

Description

The present invention is method of setting the display panel driver when driving the display panel in a plurality of display panel driver according to the video signal, relating及Beauty Display device.

  Display panels such as plasma display panels, liquid crystal panels, and organic EL (Electro Luminescence) panels are provided with a plurality of source drivers that supply gradation voltages corresponding to video signals to a plurality of source lines formed on the display panel. It has been.

  At this time, since the driving method of each source driver is determined in accordance with the driving method of the display panel, it is common to provide a separate timing controller for controlling the operation timing of the functions of the source driver and the like.

  Therefore, a display panel equipped with an EEPROM (Electrically Erasable Programmable Read-Only Memory) that stores system interface information to be set in the timing controller in accordance with the specifications of the system consisting of these display panels and a plurality of source drivers has been proposed. (For example, refer to FIG. 1 of Patent Document 1).

  Communication between the timing controller and the EEPROM can be handled by providing a direct communication path as long as it has a one-to-one relationship. Therefore, an integrated circuit in which a source driver and a timing controller are integrally formed is being developed (see Patent Document 2). In such an integrated circuit, setting from the EEPROM is required for each source driver having a built-in timing controller, and communication is performed by preparing a dedicated line between each source driver and the EEPROM, or by using a common communication line. It is necessary to set the timing differently.

  Therefore, as a method for simplifying communication between each source driver and the EEPROM, a technique for communicating between source drivers has been devised (see FIG. 1 of Patent Document 3).

  In this display panel, only one source driver 6a of each of the source drivers 6 is connected to the EEPROM 21, and the source driver 6a serves as a base point to capture system interface information read from the EEPROM 21. Then, the source driver 6a performs its own setting based on the system interface information, and this system interface information is connected to other sources cascade-connected via a first ITO (Indium Tin Oxide) wiring pattern 12. Relay supplied to the driver 6. At this time, the other source driver 6 performs its own setting based on the system interface information supplied via the first ITO wiring pattern 12 and transmits the system interface information via the second ITO wiring pattern 12. Are relayed to another source driver 6 connected in cascade. With this configuration, the system interface information read from the EEPROM 21 is also supplied to other source drivers 6 via the source driver 6a serving as a base point, and the setting based on the system interface information is also performed in the source driver 6. .

  As described above, in the display panel described above, the setting information read from the EEPROM is once taken into the source driver serving as the base point, and this is relay-supplied to other source drivers via the cascade-connected wirings. . Therefore, as the number of stages of source drivers cascaded in series increases, the time spent before setting information is supplied to all source drivers becomes longer. Therefore, there is a problem that the waiting time from the start of the setting process to the transition to the actual display operation becomes long.

Japanese Patent Laid-Open No. 2007-079077 JP 2010-190932 A JP 2009-32714 A

The present invention, such a problem are those to have been made to solve, quickly to a plurality of display panel driver setting method of a display panel driver which can perform settings to match the specifications, and Viewing device The purpose is to provide.

In the display panel driver setting method according to the present invention, a plurality of display panel drivers that drive a display panel that displays an image corresponding to a video signal are set according to specifications based on setting data stored in a memory. A display panel driver setting method, wherein one display panel driver in each of the display panel drivers writes a read command for requesting reading of the setting data from the memory and writing of the setting data to the memory When a memory access signal indicating one of the requested write commands is supplied to the memory and other display panel drivers other than the one display panel driver, and the memory access signal indicates the read command Setting based on the setting data fetched from the memory on the first line And performing, the other display panel driver, wherein when said memory access signal supplied from the display panel driver 1 indicates the read command, at the same time the uptake behavior of the setting data by the first display panel driver Fetching the setting data from the first line and performing setting based on the setting data.

A display device according to the present invention includes a display panel that displays an image according to a video signal, a first display panel driver and a second display panel driver that drive the display panel, a memory that stores setting data, The first display panel driver includes: a read command that requests reading of the setting data from the memory; and a write command that requests writing of the setting data to the memory. A first circuit that outputs a memory access signal indicating one through a first bidirectional terminal; a first capture control circuit that generates a capture enable signal when the memory access signal indicates the read command; A first register that receives the setting data read from the memory via an input terminal and captures the setting data in response to the capture enable signal; The second display panel driver, the second loading of the first output via a bidirectional terminal said memory access signal inputted to the second bidirectional terminal generates a capture enable signal to indicate the read command The setting data read operation from the control circuit and the setting data read by the first register of the first display panel driver in response to the take-in enable signal. A second register that captures simultaneously, and an output terminal of the memory is connected to the input terminal of the first and second display panel drivers by a first line, and the first and second display panel drivers Each of the first and second bidirectional terminals and the memory are connected by a second line.

  In the present invention, when setting a plurality of display panel drivers that drive the display panel to a state in accordance with the specifications, setting data indicating the setting contents is stored in a memory. One of the plurality of display panel drivers supplies a memory access signal indicating that the setting data is in a read state to the other display panel drivers together with the memory. In response to the memory access signal, the memory reads the setting data on the first line. At this time, the first display panel driver takes in the setting data read out on the first line and performs setting based on the setting data. On the other hand, the other display panel driver takes in the setting data from the first line in accordance with the memory access signal supplied from the one display panel driver and performs setting based on the setting data.

  According to this configuration, the setting data is read from the memory onto the first line in response to the memory access signal issued from the one display panel driver, and the setting data read onto the first line is read out from the memory. Are taken into the display panel driver and the other display panel driver at the same time. Therefore, the setting operation can be quickly completed as compared with the case where the setting data read from the memory is relayed in order to each of the plurality of display panel drivers via the cascade wiring.

It is a block diagram which shows schematic structure of the display apparatus which concerns on this invention. It is a block diagram which shows the internal structure of source driver 13A, 13B as a display panel driver based on this invention. 6 is a time chart illustrating an example of an internal operation of the source driver 13 when pixel data is captured in ascending order of latch numbers. 6 is a time chart showing an example of an internal operation of the source driver 13 when pixel data is taken in descending order of latch numbers. 3 is a block diagram illustrating an internal configuration of a setting data acquisition control unit 130. FIG. 4 is a time chart showing an operation for fetching setting data from a setting data memory 14; 4 is a diagram showing a connection form of source drivers 13A and 13B and setting data memory 14. FIG. 6 is a time chart showing a setting data writing operation to the setting data memory 14;

  FIG. 1 is a block diagram showing a schematic configuration of a display device including a display panel driver according to the present invention.

  As shown in FIG. 1, the display device includes a display panel 10, a drive control unit 11, a scan driver 12, source drivers 13 </ b> A and 13 </ b> B, and a setting data memory 14. A drive control unit 11A and a drive unit 15A are built in the source driver 13A, and a drive control unit 11B and a drive unit 15B are built in the source driver 13B. In the example shown in FIG. 1, the scanning driver 12 is provided separately from the source drivers 13A and 13B. However, the scanning driver 12 may be incorporated in the source driver 13A or 13B.

The display panel 10 is a two-dimensional image display display panel including a plasma display panel, a liquid crystal panel, an organic EL panel, and the like. The display panel 10 includes n scanning lines C _{1 to} C _n each extending in the horizontal direction of the two-dimensional screen (n is an integer of 2 or more) and 2m each extending in the vertical direction of the two-dimensional screen. (M is an integer greater than or equal to ₁ ) source lines S _{1 to} S _2m are provided, and a display cell that bears a pixel is formed in a region (region surrounded by a broken line) of each intersection of the scan line and the source line. Has been.

The drive controllers 11 _</ b _{> A} and 11 _</ b _> B generate scan control signals to sequentially apply scan pulses to the scan lines C _{1 to} C _n according to the input video signal, and supply the scan control signals to the scan driver 12. The scan driver 12 generates a scan pulse at a timing corresponding to the scan control signal and sequentially applies the scan pulse to each of the scan lines C _{1 to} C _n of the display panel 10.

The drive control units 11A and 11B generate various control signals such as a scan clock signal SCLK and a start pulse signal ST (described later) synchronized with the input video signal, and drive units 15A and 15B in the source drivers 13A and 13B. To supply. Further, the drive control units 11A and 11B generate pixel data PD representing the luminance level of each pixel based on the input video signal, and drive the data 15A in a serial form for each display line (2m). And 15B. That is, the drive control unit 11A generates pixel data PD ₁ , PD ₂ , PD ₃ ,..., PD _m composed of a series of pixel data PD corresponding to the first half of one display line based on the input video signal, and sequentially Supply to the drive unit 15A. Further, the drive control unit 11B generates pixel data PD _{m + 1} , PD _{m + 2} , PD _{m + 3} ,..., PD _2m composed of a series of pixel data PD corresponding to the second half of one display line based on the input video signal, and sequentially It supplies to the drive part 15B.

  The source drivers 13A and 13B, each serving as a display panel driver, have the same internal configuration and are constructed in different semiconductor IC chips.

The drive unit 15A of the source driver 13A includes _m latches (described later) that sequentially capture each of the PD ₁ to PD _m of the pixel data PD _{1 to} PD _2m . The drive unit 15A generates drive pulses GP _{1 to} GP _m having peak values of gradation voltages corresponding to the luminance levels indicated by the pixel data PD _{1 to} PD _m captured by the latches, and outputs the drive pulses GP _{1 to} GP _m , respectively. through D ₁ to D _m output to the outside of the chip. The output terminals D _{1 to} D _m of the source driver 13A are connected to source lines S _{1 to} S _m of the display panel 10, respectively. Therefore, the drive pulses GP _{1 to} GP _m generated in the source driver 13A are applied to the source lines S _{1 to} S _m via the output terminals D _{1 to} D _m .

Driving portion 15B of the source driver 13B has the above-mentioned pixel data _{PD 1 ~PD 2m PD m + 1} ~PD 2m each sequentially captures the m latches of of the (to be described later). The drive unit 15B generates drive pulses GP _{m + 1 to} GP _2m having peak values corresponding to the luminance levels indicated by the pixel data PD _{m + 1 to} PD _2m captured in the latches, and outputs the output pulses GP _{m + 1 to} GP _2m , respectively. through D ₁ to D _m output to the outside of the chip. The output terminals D _{1 to} D _m of the source driver 13B are connected to the source lines S _{m + 1 to} S _2m of the display panel 10, respectively. Therefore, the drive pulses GP _{m + 1 to} GP _2m generated in the source driver 13B are applied to the source lines S _{m + 1 to} S _2m via the output terminals D _{1 to} D _m .

The setting data memory 14 is a non-volatile memory such as an EEPROM, for example. As setting data for specifying the settings of the source drivers 13A and 13B, that is, the operation in accordance with the system specifications, the leading latch specifying data DL _H and the trailing latch specifying data DL _T, and the scan direction designating data _{D SCN} are stored in advance. Note that the first latch designating data DL _H, in the data latch unit mounted on the source driver 13A and 13B, a data indicating the number of latches should take the uptake of the head of the pixel data PD of the display lines. Further, the tail latch designating data DL _T, within such a data latch unit is data indicating the number of latches should take the last pixel data PD capture display line. Further, the scan direction designation data _DSCN is to select the latches to be fetched of the pixel data pieces in this data latch part sequentially in either of the scan number ascending order or the latch number descending order. This data specifies whether to go. For example, when the pixel data pieces are taken into the respective latches in the ascending order of the latch numbers in the data latch unit, the logic level is 0. The designated data _DSCN is stored in the setting data memory 14.

Configuration data memory 14, the top latch designating data DL _H corresponding to each source driver 13A and 13B, the tail latch specifying data DL _T, and the scan direction designating data _{D SCN,} memory access signal BDAO (described later supplied from the source driver 13A Read in serial form. At this time, the setting data memory 14 supplies these _DL H, the configuration data signal BDAI representative of the DL _T and _{D SCN} in serial form to the source driver 13A and 13B. The setting data memory 14 in response to the memory access signal BDAO supplied from the source driver 13A, the top latch designating data DL _H to be set, the writing of tail latch specifying data DL _T, and the scan direction designating data _{D SCN} each Do.

  FIG. 2 is a block diagram showing an internal configuration of the source drivers 13A and 13B.

  As shown in FIG. 2, each of the source drivers 13A and 13B includes a setting data acquisition control unit 130, a latch selection counter 131, a latch enable generation unit 132, a data latch unit 133, and a drive pulse output unit 134.

The setting data acquisition control unit 130 captures and holds the setting data signal BDAI read from the setting data memory 14 via the input terminal T1 provided in the source driver (13A, 13B). Then, the setting data acquisition control unit 130, supplied from the setting data signal BDAI, the top latch designating data DL _H, read and extract the tail latch specifying data DL _T, and the scan direction designating data _{D SCN,} these latch selection counter 131 To do.

  Further, the setting data acquisition control unit 130, after the master is turned on, when the master slave designation signal MSC supplied from the outside via the input terminal T0 provided in the source driver (13A, 13B) indicates the master side. A memory access signal BDAO (to be described later) for accessing the setting data memory 14 is generated in accordance with a predetermined timing, and this is generated via a bidirectional terminal T2 provided in the source driver (13A, 13B). Output outside the chip. On the other hand, when the master slave designation signal MSC indicates the slave side, the setting data acquisition control unit 130 takes in the memory access signal BDAO from the outside of the chip via the bidirectional terminal T2.

  Further, when the master slave designation signal MSC indicates the master side, the setting data acquisition control unit 130 generates a chip select signal BRST and a clock signal BCK (described later) according to a predetermined timing after power-on, These are output to the outside of the chip via bidirectional terminals T3 and T4 provided in the source driver (13A, 13B). On the other hand, when the master slave designation signal MSC indicates the slave side, the setting data acquisition control unit 130 captures these BRST and BCK from the outside of the chip via the bidirectional terminals T3 and T4.

  The latch selection counter 131 includes an up / down counter 1311 and a comparator 1312.

Up-down counter 1311 in response to the start pulse signal ST supplied from the drive control unit 11 takes in the latch number indicated by the top latch designating data DL _H as a count initial value. Here, the up / down counter 1311 operates as an up counter when the scan direction designation data _DSCN indicates the ascending order of the latch number, and counts up the value from the initial count value for each pulse of the scan clock signal SCLK. Go. On the other hand, the up / down counter 1311 operates as a down counter when the scan direction designation data _DSCN indicates the descending order of the latch numbers, and counts down the value from the initial count value for each pulse of the scan clock signal SCLK. Go. At this time, the up / down counter 1311 supplies the current count value to the comparator 1312 as the latch selection value LS. Comparator 1312, tail and value of the latch number indicated by the latch designating data DL _T, only when the latch selection value LS are equal, the generated up-down counter which a reset signal RS for resetting the count value to zero 1311. In response to the reset signal RS, the up / down counter 1311 resets the current count value to zero and stops the counting operation.

Thus, the up-down counter 1311, first, in response to the start pulse signal ST, captures the latch number indicated by the top latch designating data DL _H as a count initial value. Then, the up / down counter 1311 supplies the count initial value as the latch selection value LS to the latch enable generation unit 132 at the next stage as the count value obtained by up-counting or down-counting the initial count value according to the scan direction designation data _DSCN. It is.

Based on the latch selection value LS, the latch enable generation unit 132 latches only one of the latch enable signals E _{1 to} E _m with a logic level 1 indicating latch enable and the other with a logic level 0 indicating latch disable. It consists decoder generates an enable signal _E 1 to E _m.

For example, when the latch selection value LS indicates the latch number “1”, the latch enable generation unit 132 sets only E ₁ among the latch enable signals E _{1 to} E _m to the logic level 1 and all the others to the logic level 0. Latch enable signals E _{1 to} E _m are generated. Further, when the latch selection value LS indicates the latch number “2”, the latch enable generation unit 132 sets only E ₂ of the latch enable signals E _{1 to} E _m to the logic level 1, and all the others are the logic level 0. Latch enable signals E _{1 to} E _m are generated. When the latch selection value LS indicates the latch number “3”, the latch enable generation unit 132 sets only E ₃ among the latch enable signals E _{1 to} E _m to the logic level 1 and all the others to the logic level 0. Latch enable signals E _{1 to} E _m are generated. When the latch selection value LS indicates the latch number “m”, the latch enable generation unit 132 sets only E _m among the latch enable signals E _{1 to} E _m to the logic level 1 and all the others to the logic level 0. Latch enable signals E _{1 to} E _m are generated.

The latch enable generation unit 132 supplies the above-described latch enable signals E _{1 to} E _m to the data latch unit 133.

Data latch unit 133 consists of m latch ₁₃₃ 1 to 133 _m to latch number "1" ~ "m" is assigned, the enable terminal EN of the respective latch enable signals _E 1 to E _m described above is Each is supplied. Further, the latch ₁₃₃ 1 to 133 _m each data input terminal I pixel data PD described above has been commonly supplied, and the scan clock signal SCLK to latches ₁₃₃ 1 to 133 _m each clock input terminal and the common Has been supplied to. At this time, among the latches 133 _{1 to} 133 _m , only _one latch 133 whose enable terminal EN is supplied with the latch enable signal E of the logic level 1 takes in the pixel data PD in accordance with the scan clock signal SCLK. Hold.

With this configuration, the latches 133 _{1 to} 133 _m individually take in the pixel data PD supplied from the drive control unit 11 according to the latch enable signals E _{1 to} E _m supplied from the latch enable generation unit 132. Hold. Then, the latches 133 _{1 to} 133 _m supply the pixel data held therein to the drive pulse output unit 134 as the pixel data PPD _{1 to} PPD _m .

Driving pulse output section 134 individually each pixel data _PPD 1 _{~PPD m,} converted to drive pulses GP with a peak voltage corresponding to the luminance level represented by the pixel data PPD, each pixel data _PPD 1 ~ each of the driving pulses _GP 1 _{~GP m} corresponding to PPD _m, via the output terminal _D 1 to D _m.

  The operations of the latch selection counter 131, the latch enable generation unit 132, and the data latch unit 133 will be described below.

First, the output to the terminal _D 1 to D _m each latch corresponding ₁₃₃ 1 to 133 _m, ascending latch number, that is, the latch _{133 1, 133 2, 133 3} , ···, 133 m-1, 133 _{When the} pixel data is captured in the order of _m , the following leading latch designation data DL _H , trailing latch designation data DL _T and scan direction designation data _DSCN are written in the setting data memory 14 in advance.

DL _H : “1”
DL _T : “m”
_DSCN : “0”
That is, first latch designation data DL _H indicating the latch number “1” of the latch responsible for fetching the first pixel data piece of the display line, and latch number “m” of the latch responsible for fetching the last pixel data piece of the display line. the tail latch designating data DL _T indicating a is written in the setting data memory 14. Further, scan direction designation data _DSCN of logic level 0 indicating that pixel data pieces are to be fetched in ascending order of latch numbers are written in the setting data memory 14.

Thus, the up-down counter 1311, as shown in FIG. 3, in accordance with the start pulse signal ST, captures the value "1" indicated by the top latch designating data DL _H as a count initial value, latch selection value that value LS is supplied to the latch enable generation unit 132 as LS. As shown in FIG. 3, the latch enable generation unit 132 _first supplies a latch enable signal E ₁ of logic level ₁ to the latch 133 ₁ according to the value “1” indicated by the latch selection value LS. At this time, the latch 133 ₁ takes in the value of the pixel data PD and outputs it as the pixel data PPD ₁ . Here, since the scan direction designation data _DSCN is “0”, the up / down counter 1311 operates as an up counter. Therefore, at every rising edge of the scan clock signal SCLK, the count value of the up / down counter 1311, that is, the latch selection value LS increases by "1" as shown in FIG. As a result, the latch enable generator 132 sequentially selects the latch enable signals E ₂ , E ₃ ,..., E, which sequentially become the logic level 1, as shown in FIG. _m−1 and E _m are supplied to the latches 133 ₂ , 133 ₃ , 133 ₄ ,..., 133 _m−1 , 133 _m . At this time, each latch ₁₃₃ 2 to 133 _m, in turn captures the value of the pixel data PD at the timing of the latch enable signal _E 2 to E _m supplied respectively as shown in FIG. 3, respectively pixel data _PPD 2 ~ Output as PPD _m . Here, the count value of the up-down counter 1311, becomes equal to the value "m" indicated by the tail latch designating data DL _T, the reset signal RS is generated by the comparator 1312, the count value of the up-down counter 1311, that is The latch selection value LS is reset to “0”. Thus, after the latch enable signal _{E m} of the logic level 1 is supplied to the latch 133 _m, generation of the latch enable signal _{E m} + 1 to E _k logic level 1 is not made, therefore, of the latch ₁₃₃ m + 1 to 133 _k No capture operation is performed.

On the other hand, when the above-mentioned latches 133 _{1 to} 133 _m are fetched in the descending order of the latch numbers, that is, in the order of the latches 133 _m , 133 _m−1 ,..., 133 ₃ , 133 ₂ , 133 ₁ the following such first latch designating data DL _H, previously written the tail latch specifying data DL _T, and the scan direction designating data _{D SCN} in the setting data memory 14.

DL _H : “m”
DL _T : "1"
_DSCN : "1"
That is, first latch designation data DL _H indicating the latch number “m” of the latch responsible for fetching the first pixel data piece of the display line, and latch number “1” of the latch responsible for fetching the last pixel data piece of the display line. the tail latch designating data DL _T indicating a is written in the setting data memory 14. Furthermore, scan direction designation data _DSCN of logic level 1 indicating that the pixel data pieces are taken in descending order of the latch numbers are written in the setting data memory 14.

Thus, the up-down counter 1311, as shown in FIG. 4, in response to the start pulse signal ST, captures the value "m" indicated by the top latch designating data DL _H as a count initial value, latch selection value that value LS is supplied to the latch enable generation unit 132 as LS. Latch enable generation section 132, according to the value "m" indicated by the latch selection value LS, as shown in FIG. 4, first, supplying a latch enable signal E _m of the logic level 1 to the latch 133 _m. At this time, the latch 133 _m takes in the value of the pixel data PD and outputs it as the pixel data PPD _m . Here, since the scan direction designation data _DSCN is “1”, the up / down counter 1311 operates as a down counter. Therefore, at every rising edge of the scan clock signal SCLK, the count value of the up / down counter 1311, that is, the latch selection value LS decreases by "1" as shown in FIG. As a result, the latch enable generation unit 132 sequentially selects the latch enable signals E _m , E _m−1 ,... That sequentially become the logic level 1 as shown in FIG. 4 according to the value of the latch selection value LS. , E ₂ , E ₁ are supplied to the latches 133 _m , 133 _m−1 ,..., 133 ₂ , 133 ₁ . At this _time, each of the _{133 m-1 ~133} 1 in turn captures the value of the pixel data PD at the timing of the latch enable signal is supplied to each _{E m-1 ~E} 1 as shown in FIG. 4, respectively pixel data output as PPD _m-1 ~PPD 1. Here, the count value of the up-down counter 1311, becomes equal to the value "1" indicated by the tail latch designating data DL _T, the reset signal RS is generated by the comparator 1312, the count value of the up-down counter 1311, that is The latch selection value LS is reset to “0”.

As described above, the data latch unit 133 changes from the first latch to the rear latch along the scan direction of the pixel data set by the setting data (DL _H , DL _T , _DSCN ) stored in the setting data memory 14. The pixel data PD is sequentially fetched.

Next, an operation for fetching setting data (DL _H , DL _T and _DSCN ) from the setting data memory 14 by the setting data acquisition control unit 130 will be described.

  FIG. 5 is a block diagram illustrating an internal configuration of the setting data acquisition control unit 130.

  As shown in FIG. 5, the setting data acquisition control unit 130 includes a chip select generation circuit 1301, a clock generation circuit 1302, an acquisition control circuit 1303, a data register 1304, and a memory control circuit 1305.

  When the master slave designation signal MSC is at the logic level 1 indicating the master side, the chip select generation circuit 1301 has a period IP according to a predetermined timing after power-on, that is, a setting start timing as shown in FIG. A chip select signal BRST that is in a logic level 0 state is generated for a certain period, and this is output to the outside of the chip via line La and bidirectional terminal T4. Further, the chip select generation circuit 1301 supplies the chip select signal BRST to each of the clock generation circuit 1302, the capture control circuit 1303, and the memory control circuit 1305 via the line La. The chip select generation circuit 1301 does not perform the above-described generation operation of the chip select signal BRST when the master slave designation signal MSC is at the logic level 0 indicating the slave side, during this time, the line La and the bidirectional terminal T4. Is set to operate as an input terminal.

  Only when the master slave designation signal MSC is at the logic level 1 indicating the master side, the clock generation circuit 1302 continues while the chip select signal BRST supplied via the line La is in the logic level 0 state. A clock signal BCK including 32 clock pulses as shown in FIG. 6 is generated and output to the outside of the chip via the line Lb and the bidirectional terminal T3. Further, the clock generation circuit 1302 supplies the clock signal BCK to each of the capture control circuit 1303, the data register 1304, and the memory control circuit 1305 via the line Lb. Note that the clock generation circuit 1302 does not generate the clock signal BCK when the master slave designation signal MSC is at the logic level 0 indicating the slave side, and during this time, the line Lb and the bidirectional terminal T3 are input terminals. Set to the state to operate as.

When the chip select signal BRST transitions from the logic level 1 to the logic level 0, the fetch control circuit 1303 first has operation codes C _{1 to} C ₈ (described later) included in the memory access signal BDAO as a read command. It is determined whether or not to show. Here, only when the operation code indicates a read command, the capture control circuit 1303, as shown in FIG. 6, at the timing when the number of clock pulses by the clock signal BCK reaches 24, from the logic level 0 to the logic level 1 Then, an acquisition enable signal EN that makes a transition to the above state and maintains that state for a period of 8 clock pulses is supplied to the data register 1304. On the other hand, when it is determined that the operation codes C _{1 to} C ₈ do not indicate a read instruction, the capture control circuit 1303 supplies a capture enable signal EN that maintains the logic level 0 state to the data register 1304. . However, when the chip select signal BRST transitions from the logic level 1 to the logic level 0 state when the read instruction is fixed and used, the chip select signal is not input when the memory access signal BDAO is not input. It is also possible to generate the capture enable signal EN by detecting the BRST logic level 0 state.

The data register 1304 receives the serial configuration data signal BDAI read from the configuration data memory 14 through the input terminal T1 and the line L1 while the capture enable signal EN is in the logic level 1 state. This is sequentially taken in synchronization with the clock signal BCK. The data register 1304 supplies first latch designating data DL _H, the tail latch specifying data DL _T, and the scan direction designating data _{D SCN,} the latch selection counter 131 included in the acquired setting data signal BDAI. It should be noted that the predetermined timing after power-on as described above, that is, the execution opportunity of the setting operation for reflecting the setting data (DL _H , DL _T , _DSCN ) stored in the setting data memory 14 to the data register 1304 is, for example, , At least once within a predetermined period after the power is turned on. Further, after the power is turned on, the setting operation may be repeatedly executed periodically (for example, once per second). In any of the setting operations, it is desirable that the setting operation is performed after the power supply has reached a stable state.

When the master slave designation signal MSC is at the logic level 1 indicating the master side and the chip select signal BRST transitions from the logic level 1 to the logic level 0, the memory control circuit 1305 first starts as shown in FIG. Then, a memory access signal BDAO including operation codes C _{1 to} C ₈ representing a read instruction in 8-bit serial is sent on line L2. Subsequently, the memory control circuit 1305 includes a memory access signal including address data A _{1 to} A ₁₆ that represents the address in the setting data memory 14 in which the setting data (DL _H , DL _T , _DSCN ) are stored in 16-bit serial. BDAO is sent out on line L2. The memory control circuit 1305 supplies the memory access signal BDAO to the take-in control circuit 1303 via the line L2, and outputs it to the outside of the chip via the bidirectional terminal T2. When the master slave designation signal MSC is at a logic level 0 indicating the slave side, the memory control circuit 1305 does not send out the memory access signal BDAO, and during this time, the line L2 and the bidirectional terminal T2 are input terminals. Set to the state to operate as.

  FIG. 7 is a diagram showing a connection form between the setting data acquisition control unit 130 and the setting data memory 14 by extracting the setting data acquisition control unit 130 provided in each of the source drivers 13A and 13B.

  In the example shown in FIG. 7, a master slave designation signal MSC of logical level 1 indicating the master side is supplied to the setting data acquisition control unit 130 of the source driver 13A, and the setting data acquisition control of the source driver 13B A master slave designation signal MSC having a logic level 0 indicating the slave side is supplied to 130b serving as the unit 130. That is, the source driver 13A is a master driver for fetching setting data, and the source driver 13B is a slave driver. As a result, among the setting data acquisition controllers 130a and 130b, the chip select generation circuit 1301, the clock generation circuit 1302 and the memory control circuit 1305 of 130a execute the operations as described above, while the chip select generation circuit 1301 of 130b, the clock The generation circuit 1302 and the memory control circuit 1305 are in an operation stop state.

  In addition, as shown in FIG. 7, the input terminal T1 responsible for the input of the setting data signal BDAI in each of the source drivers 13A and 13B is connected to the serial output terminal SO of the setting data memory 14 by a line LL1. Further, in each of the source drivers 13A and 13B, the bidirectional terminal T2 responsible for input / output of the memory access signal BDAO is connected to the serial input terminal SI of the setting data memory 14 through a line LL2. Further, in each of the source drivers 13A and 13B, the bidirectional terminal T3 responsible for the input / output of the clock signal BCK is connected to the clock terminal CK of the setting data memory 14 through a line LL3. Further, the bidirectional terminal T4 for inputting / outputting the chip select signal BRST in each of the source drivers 13A and 13B is connected to the chip select terminal CS of the setting data memory 14 through the line LL4.

Here, when starting the process of reflecting the data in the setting data memory 14 to the data register 1304, the setting data acquisition control unit 130a of the source driver 13A uses the chip select signal BRST and the clock signal BCK as shown in FIG. This is supplied to the setting data acquisition controller 130b and the setting data memory 14 of the driver 13B. Further, as shown in FIG. 6, the setting data acquisition control unit 130a acquires the memory access signal BDAO including the operation codes C _{1 to} C ₈ indicating the read instruction and the address data A _{1 to} A ₁₆ and acquires the setting data of the source driver 13B. The data is supplied to the control unit 130b and the setting data memory 14. Thereby, the setting data memory 14 reads the setting data (DL _H , DL _T , _DSCN ) stored at the address indicated by the address data A _{1 to} A ₁₆ . Then, the setting data memory 14, such setting data _{(DL H, DL T, D} SCN) configuration data signal BDAI comprising data _DA 1 to DA ₈ as shown to in Figure 6 representing a serial form, the source driver 13A and 13B To the setting data acquisition control units 130a and 130b.

  During this period, the chip select signal BRST generated by the setting data acquisition control unit 130a is supplied to its own acquisition control circuit 1303, and setting data acquisition is performed via the bidirectional terminal T4 and the line La of the source driver 13B. It is supplied to the capture control circuit 1303 of the control unit 130b. Further, the clock signal BCK generated by the setting data acquisition control unit 130a is supplied to its own acquisition control circuit 1303, and the acquisition control of the setting data acquisition control unit 130b via the bidirectional terminal T3 of the source driver 13B. This is supplied to the circuit 1303.

As a result, the capture control circuit 1303 of each of the setting data acquisition controllers 130a and 130b supplies a capture enable signal EN having a logic level 1 as shown in FIG. In response to the fetch enable signal EN, the data registers 1304 of the setting data acquisition controllers 130a and 130b fetch the setting data signal BDAI read from the setting data memory 14 as shown in FIG. 6 and store it. . That is, the top latch designating data DL _H represented by the set data signal BDAI, since tail latch designating data DL _T, and the scan direction designating data _{D SCN} is captured simultaneously setting data acquisition control unit 130a and 130b each data register 1304 is there.

Accordingly, the setting data (DL _H , DL _T , _DSCN ) stored in the setting data memory 14 is simultaneously held in the data registers 1304 of the source drivers 13A and 13B, and the setting according to the setting data is performed. . At this time, as the initial setting after power-on, setting data as an initial setting is taken into the data register 1304.

Note that the memory control circuit 1305 of the setting data acquisition control unit 130a stores the setting data (DL _H , DL _T , _DSCN ) in the setting data memory 14 in addition to the reading control for reading the setting data (DL _H , DL _T , _DSCN ) from the setting data memory 14 as described above. On the other hand, it is also possible to perform write control for writing the setting data.

Here, when writing the setting data into the setting data memory 14, the chip select generation circuit 1301 and the clock generation circuit 1302 of the setting data acquisition control unit 130a generate a chip select signal BRST and a clock signal BCK as shown in FIG. These are supplied to the setting data acquisition control unit 130b and the setting data memory 14. Further, as shown in FIG. 8, the memory control circuit 1305 of the setting data acquisition control unit 130a includes operation codes C _{1 to} C ₈ indicating a write command, address data A _{1 to} A ₁₆ indicating a write address, and write data. setting data _{(DL H, DL T, D} SCN) a memory access signal BDAO including data _DB 1 to DB ₈ representing the supplies the setting data memory 14 and the source driver 13B. In response to the memory access signal BDAO, the setting data memory 14, the address indicated in the address data _A 1 _{to A 16} as described above, setting for the write Deda _{(DL H, DL T, D} SCN) data representative of the DB writing a _{1 ~DB 8.}

At this time, the memory access signal BDAO is supplied to the acquisition control circuit 1303 of the setting data acquisition control unit 130a via the line L2, and the acquisition control of the setting data acquisition control unit 130b via the bidirectional terminal T2. It is also supplied to the circuit 1303. Therefore, the fetch control circuit 1303 is supplied with the chip select signal BRST and the clock signal BCK as shown in FIG. 8, but the operation codes C _{1 to} C ₈ included in the memory access signal BDAO are write commands. Then, a fetch enable signal EN of logic level 0 indicating write disable is supplied to the data register 1304. This prevents a malfunction that the data register 1304 of each of the setting data acquisition controllers 130a and 130b erroneously takes in data when writing data to the setting data memory 14. However, when it is desired to immediately reflect the setting data to the slave driver, the acquisition control circuit 1303 of the setting data acquisition control unit 130b changes the acquisition enable signal EN to the logic level 1 state for both reading and writing. It is also possible to make it.

In the above embodiment, the plurality of source lines S formed on the display panel 10 are divided into two line groups (S _{1 to} S _m , S _{m + 1 to} S _2m ), and each line group is divided into two source drivers ( 13A, 13B). However, the number of source drivers 13 is not limited to two, and may be three or more. At this time, in order to set one of t source drivers (t is an integer of 2 or more) as a master driver and all other source drivers as slave drivers, respective master slave designation signals MSC corresponding to the source drivers are set in advance. Supply it to the source driver.

In short, the setting method of a display panel driver according to the present invention, a plurality of display panel driver (13A, 13B) when setting the state combined to the specification, the setting data _{(DL H} based on the specification, DL _{T, D SCN} ) Is stored in the memory (14). At this time, one display panel driver (13A) of the plurality of display panel drivers receives a first signal (memory access signal BDAO or chip select signal BRST) indicating that the setting data is in a read state. At the same time, it is supplied to another display panel driver (13B). In response to the first signal (BDAO, BRST), the memory reads the setting data to the first line (LL1). At this time, the one display panel driver (13A) takes in the setting data read out on the first line (1303, 1304) and performs setting based on the setting data. On the other hand, the other display panel driver (13B) fetches the setting data from the first line in accordance with the first signal (BDAO, BRST) supplied from the one display panel driver (13A) (1303, 1304). ), Setting based on the setting data.

The display panel driver according to the present invention, setting data stored in the memory _{(14) (DL H, DL} T, D SCN) first signal (BDAO, BRST) indicating that a read state , A memory control circuit (1305) that outputs via the bidirectional terminal (T2), and a capture enable signal (1) according to the first signal or the first signal input from the outside via the bidirectional terminal (T2). EN) and a register (1304) for fetching setting data read from the memory (14) in response to the fetch enable signal.

The display device according to the present invention includes a display panel (10) for displaying an image corresponding to a video signal, a plurality of display panel drivers (13A, 13B) for driving the display panel, and setting data (DL _H , DL _And a memory (14) in which _{T 1} , D _SCN ) are stored. Each of the display panel drivers includes the memory control circuit (1305), the capture control circuit (1303), and the register (1304). At this time, the output terminal (SO) of the memory (14) is connected to the input terminal (T1) of each display panel driver by the first line (LL1), and the bidirectional terminal (T2) and the memory of each display panel driver. Are connected by the second line (LL2).

Therefore, according to the above configuration, the first signal emitted from the first display panel driver (13A) (BDAO, BRST) according to the setting from the memory (14) data _{(DL H, DL T, D} SCN) is The first display panel driver (13A) and the other display panel driver (13B) read the setting data read on the first line at the same time as they are read out to the first line (LL1).

  Therefore, according to the present invention, the setting operation is completed more quickly than the case where the setting data read from the memory is relayed in turn to each of the display panel drivers connected in series via the cascade wiring. It becomes possible to make it.

13A, 13B Source driver 14 Setting data memory 130 Setting data acquisition controller

Claims (11)

A display panel driver setting method in which a plurality of display panel drivers that drive a display panel that displays an image according to a video signal are set according to specifications based on setting data stored in a memory,
One display panel driver of each of the display panel drivers outputs one of a read command for requesting reading of the setting data from the memory and a write command for requesting writing of the setting data to the memory. The memory access signal shown is supplied to the memory and other display panel drivers other than the one display panel driver, and is read out from the memory onto the first line when the memory access signal indicates the read command. Capturing the setting data and performing setting based on the setting data;
When the memory access signal supplied from the one display panel driver indicates the read command, the other display panel driver outputs the setting data on the first line simultaneously with the setting data fetching operation by the one display panel driver. And a step of taking the setting data from and setting based on the setting data.   2. The display panel driver setting method according to claim 1, wherein the setting is performed in a predetermined period after the power is turned on.   2. The display panel driver setting method according to claim 1, wherein the setting is periodically performed after the power is turned on.   4. The display panel driver setting method according to claim 1, wherein the memory, the one display panel driver, and the other display panel driver are connected to the first line, respectively. . The memory, the one display panel driver, and the other display panel driver are further connected to a second line different from the first line, respectively.
5. The display panel driver according to claim 2, wherein the one display panel driver supplies the memory access signal to the memory and the other display panel driver through the second line. 6. Setting method. A display device that includes a display panel that displays an image according to a video signal, a first display panel driver and a second display panel driver that drive the display panel, and a memory that stores setting data.
The first display panel driver outputs a memory access signal indicating one of a read command for requesting reading of the setting data from the memory and a write command for requesting writing of the setting data to the memory. A first circuit that outputs via one bidirectional terminal; a first capture control circuit that generates a capture enable signal when the memory access signal indicates the read command; and the setting read from the memory A first register that receives data via an input terminal and captures the data in response to the capture enable signal;
The second display panel driver generates a capture enable signal when the memory access signal output through the first bidirectional terminal and input to the second bidirectional terminal indicates the read command. The setting control circuit and the setting data read from the memory are received via an input terminal, and the setting data is fetched by the first register of the first display panel driver in response to the fetch enable signal. A second register for capturing simultaneously with the operation,
An output terminal of the memory is connected to the input terminals of the first and second display panel drivers by a first line, and the first and second bidirectional terminals of each of the first and second display panel drivers; A display device, wherein the memory is connected by a second line.   The display device according to claim 6, wherein the first circuit is a memory control circuit that generates the memory access signal.   The memory control circuit outputs the memory access signal via a bidirectional terminal when an externally supplied master slave designation signal indicates the master side, whereas when the master slave designation signal indicates a slave side. The display device according to claim 7, wherein the bidirectional terminal is set to an input state without generating the memory access signal. The second display panel driver further includes the memory control circuit. The master display designating signal indicating the master side is externally supplied to the first display panel driver , and the memory control circuit sends the memory access signal to the first display panel driver . The master slave designation signal indicating the slave side is externally supplied to the second display panel driver , and the memory control circuit does not generate the memory access signal. the display device according to claim 8, characterized in that you set the direction pin input state. When the memory control circuit generates the memory access signal indicating the write command in the first display panel driver, the first capture control circuit stops generating the capture enable signal, and the second display In the panel driver, when the memory access signal input from the outside via the second bidirectional terminal indicates the write command, the second capture control circuit stops generating the capture enable signal. The display device according to claim 9, wherein The display device according to claim 7, wherein the memory control circuit of the first display panel driver generates the memory access signal at a predetermined timing after power is turned on.

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