Patent Publication Number: US-2018033390-A1

Title: Electrooptical device, electronic apparatus, and method for driving electrooptical device

Description:
BACKGROUND 
     1. Technical Field 
     The present invention relates to an electrooptical device, an electronic apparatus, and a method for driving an electrooptical device. 
     2. Related Art 
     In a high-definition electrooptical device, in a case where only a single driving circuit outputs data signals, a large load is applied to the single driving circuit. As a method of reducing the load, a method of outputting data signals using a plurality of (two) driving circuits is known (refer to JP-A-2007-212956). 
     Meanwhile, there is a case where the electrooptical device includes distribution circuits such as demultiplexers that distribute the data signals output from the driving circuits to a plurality of signal lines according to selection signals. Here, the selection signals for the distribution circuits can be output from each of the driving circuits in addition to the data signals. In this case, a case that controls the distribution circuits using only the selection signals output from any one of the plurality of driving circuits, is considered. 
     However, in this case, there is a difference in a load due to an operating condition in which the driving circuits supply or do not supply the selection signals to the distribution circuits. In the driving circuit that does not supply the selection signals to the distribution circuits, there is no variation in the power supply voltage due to the output of the selection signals. However, in the driving circuit that supplies the selection signals to the distribution circuits, the power supply voltage varies due to the output of the selection signals. The difference in the operating condition causes variations in the data signals between the driving circuits, and this may cause deterioration in image quality. 
     SUMMARY 
     An advantage of some aspects of the invention is to perform display with high definition and high quality by equalizing the load of each of the supply circuits in the case of driving the electrooptical device using a plurality of supply circuits which generate the data signals and the selection signals. 
     An electrooptical device according to an aspect of the invention includes: a plurality of first pixels that are disposed corresponding to the respective intersections between a plurality of first signal lines which belong to a first signal line group and a plurality of scanning lines, and that display gradation according to first data signals supplied to the first signal lines when the scanning lines are selected; a plurality of second pixels that are disposed corresponding to the respective intersections between a plurality of second signal lines which belong to a second signal line group and a plurality of scanning lines, and that display gradation according to second data signals supplied to the second signal lines when the scanning lines are selected; a first distribution circuit that distributes the first data signals to the first signal lines according to first selection signals or second selection signals; a second distribution circuit that distributes the second data signals to the second signal lines according to first selection signals or second selection signals; a first supply circuit that supplies the first data signals and the first selection signals; a second supply circuit that supplies the second data signals and the second selection signals; and a control circuit that exclusively supplies the first selection signals and the second selection signals. 
     According to this aspect, the first selection signals are supplied from the first supply circuit to the first distribution circuit. In addition, the second selection signals are supplied from the second supply circuit to the first distribution circuit. Similarly, the first selection signals are supplied from the first supply circuit to the second distribution circuit. In addition, the second selection signals are supplied from the second supply circuit to the second distribution circuit. Therefore, the load of the supply of the selection signals in the supply circuits is distributed to the first supply circuit and the second supply circuit, compared to a case where the selection signals are supplied from a single supply circuit to the first distribution circuit and the second distribution circuit. As a result, it is possible to prevent deterioration in image quality such as a decrease in luminance. 
     An electrooptical device according to another aspect of the invention includes: a plurality of pixels that are disposed corresponding to the respective intersections between 2K (K is a natural number of two or more) or more signal lines and two or more scanning lines, and that display gradation according to signals supplied to the signal lines when the scanning lines are selected; a scanning line driving circuit that sequentially selects the respective scanning lines; a first supply circuit that supplies first data signals to the respective signal lines in first signal line groups each with the K signal lines via first data lines, and that supplies first selection signals via K-P (P is a natural number of one or more) first selection signal lines; a second supply circuit that supplies second data signals to the respective signal lines in second signal line groups each with the K signal lines different from the K signal lines which belong to the first signal line groups via second data lines, and that supplies second selection signals via P second selection signal lines; a first distribution circuit that is connected to the respective signal lines in the first signal line groups, the first data lines, the K-P first selection signal lines, and the P second selection signal lines, and that supplies the first data signals to the respective signal lines in the first signal line groups according to the first selection signals or the second selection signals supplied via the first selection signal lines or the second selection signal lines; a second distribution circuit that is connected to the respective signal lines in the second signal line groups, the second data lines, the K-P first selection signal lines, and the P second selection signal lines, and that supplies the second data signals to the respective signal lines in the first signal line groups according to the first selection signals or the second selection signals supplied via the first selection signal lines or the second selection signal lines; and a control circuit that exclusively supplies the first selection signals from the first supply circuit and the second selection signals from the second supply circuit. 
     According to this aspect, the first selection signals are supplied from the first supply circuit to the first distribution circuit via the K-P first selection signal lines. In addition, the second selection signals are supplied from the second supply circuit to the first distribution circuit via the P second selection signal lines. Similarly, the first selection signals are supplied from the first supply circuit to the second distribution circuit via the K-P first selection signal lines. In addition, the second selection signals are supplied from the second supply circuit to the second distribution circuit via the P second selection signal lines. Therefore, the load of the supply of the selection signals in the supply circuits is distributed to the first supply circuit and the second supply circuit, compared to a case where the selection signals are supplied from a single supply circuit to the first distribution circuit and the second distribution circuit via the K selection signal lines. As a result, it is possible to prevent deterioration in image quality such as a decrease in luminance. 
     In the electrooptical device according to the aspect, preferably, P is K/2. According to this aspect, the load of the supply of the selection signals in the supply circuits is equally distributed to the first supply circuit and the second supply circuit, compared to a case where the selection signals are supplied from a single supply circuit to the first distribution circuit and the second distribution circuit via the K selection signal lines. As a result, it is possible to prevent the occurrence of a difference such as a decrease in luminance between when the first supply circuit supplies the selection signals and when the second supply circuit supplies the selection signals. Thus, it is possible to prevent deterioration in image quality. 
     In the electrooptical device according to the aspect, preferably, the K-P first selection signal lines and the P second selection signal lines are connected to the first distribution circuit so as to alternately correspond to the respective signal lines in the first signal line groups, and are connected to the second distribution circuit so as to alternately correspond to the respective signal lines in the second signal line groups. According to this aspect, the load of the supply of the selection signals in the supply circuits is equally distributed to the first supply circuit and the second supply circuit, compared to a case where the selection signals are supplied from a single supply circuit to the first distribution circuit and the second distribution circuit via the K selection signal lines. As a result, it is possible to prevent the occurrence of a difference such as a decrease in luminance between when the first supply circuit supplies the selection signals and when the second supply circuit supplies the selection signals. Thus, it is possible to prevent deterioration in image quality. 
     In the electrooptical device according to the aspect, preferably, the first supply circuit has a function of supplying the first selection signals via the K first selection signal lines or the second selection signal lines, and the second supply circuit has a function of supplying the second selection signals via the K second selection signal lines. According to this aspect, the load of the supply of the selection signals in the supply circuits is equally distributed to the first supply circuit and the second supply circuit, compared to a case where the selection signals are supplied from a single supply circuit to the first distribution circuit and the second distribution circuit via the K selection signal lines. In addition, since the first supply circuit and the second supply circuit both have a function of supplying the first selection signals or the second selection signals via the K first selection signal lines or the second selection signal lines, it is possible to supply the first selection signals or the second selection signals with a time margin. As a result, it is possible to prevent the occurrence of a difference such as a decrease in luminance between when the first supply circuit supplies the selection signals and when the second supply circuit supplies the selection signals. Thus, it is possible to prevent deterioration in image quality. 
     In the electrooptical device according to the aspect, preferably, the first supply circuit is provided on a first wiring board, the second supply circuit is provided on a second wiring board, and the first wiring board and the second wiring board are attached so as to overlap each other when viewed from the display direction of the pixels. According to this aspect, it is possible to reduce the size of the electrooptical device. 
     In the electrooptical device according to the aspect, preferably, the first data lines and the second data lines are alternately disposed side by side. According to this aspect, the pitch between the data lines including the first data lines and the second data lines can be narrower than the pitch between only the first data lines or the pitch between only the second data lines. In addition, it becomes easier to alternately dispose the pixel group to which the first data signals are supplied and the pixel group to which the second data signals are supplied. In this case, it is possible to make a difference in image quality between the pixel groups inconspicuous. 
     In the electrooptical device according to the aspect, preferably, a plurality of the first signal line groups and a plurality of the second signal line groups are respectively provided, and the first signal line groups and the second signal line groups are alternately disposed. According to this aspect, it is possible to alternately dispose the pixel groups driven by the data signals from the different supply circuits. Therefore, it is possible to make a difference in image quality between the pixel groups driven by the data signals from the different supply circuits inconspicuous. 
     An electronic apparatus according to still another aspect of the invention includes the above-described electrooptical device. The electrooptical device can prevent deterioration in image quality. 
     A method for driving an electrooptical device according to still another aspect of the invention, includes: supplying first data signals and first selection signals by a first supply circuit; supplying second data signals and second selection signals by a second supply circuit; distributing the first data signals to first signal lines according to the first selection signals or the second selection signals, by a first distribution circuit; distributing the second data signals to second signal lines according to the first selection signals or the second selection signals, by a second distribution circuit; displaying gradation according to the first data signals supplied to the first signal lines when scanning lines are selected, by first pixels that are disposed corresponding to respective intersections between the first signal lines and the scanning lines; displaying gradation according to the second data signals supplied to the second signal lines when the scanning lines are selected, by second pixels that are disposed corresponding to respective intersections between the second signal lines and the scanning lines; and exclusively supplying the first selection signals from the first supply circuit and the second selection signals from the second supply circuit, by a control circuit. 
     According to this aspect, the first selection signals are supplied from the first supply circuit to the first distribution circuit. In addition, the second selection signals are supplied from the second supply circuit to the first distribution circuit. Similarly, the first selection signals are supplied from the first supply circuit to the second distribution circuit. In addition, the second selection signals are supplied from the second supply circuit to the second distribution circuit. Therefore, the load of the supply of the selection signals in the supply circuits is distributed to the first supply circuit and the second supply circuit, compared to a case where the selection signals are supplied from a single supply circuit to the first distribution circuit and the second distribution circuit. As a result, it is possible to prevent deterioration in image quality such as a decrease in luminance. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is a diagram illustrating a configuration of a signal transmission system of an electrooptical device according to a first embodiment of the invention. 
         FIG. 2  is a perspective view of the opposite surface of the electrooptical device. 
         FIG. 3  is a block view illustrating a configuration of the electrooptical device. 
         FIG. 4  is a circuit diagram of each pixel. 
         FIG. 5  is an explanatory diagram of an operation of the electrooptical device. 
         FIG. 6  is a block view illustrating a configuration of a part of the electrooptical device. 
         FIG. 7  is a diagram illustrating an arrangement of connection terminals of flexible printed circuit boards in a modification example. 
         FIG. 8  is a perspective view illustrating a form of an electronic apparatus (a projection type display apparatus). 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       FIG. 1  is a diagram illustrating a configuration of a signal transmission system of an electrooptical device  1  according to an embodiment of the invention. The electrooptical device  1  includes an electrooptical panel  100 , a first supply circuit  200   a , a second supply circuit  200   b , a flexible printed circuit board  300   a  as a first wiring board, and a flexible printed circuit board  300   b  as a second wiring board. The electrooptical device  1  may be, for example, a device which has the number of pixels of 3840×2160 obtained by respectively doubling the number of pixels of full hi-vision in the vertical direction and the horizontal direction. Each of the first supply circuit  200   a  and the second supply circuit  200   b  is, for example, a driving integrated circuit.  FIG. 2  is a perspective view illustrating a configuration example of the electrooptical device  1  according to a first embodiment in which the invention is adopted.  FIG. 2  is a perspective view of the opposite surface of a main portion of  FIG. 1 . 
     The electrooptical device  1  has a configuration in which the flexible printed circuit boards  300   a  and  300   b  are connected to one side of the electrooptical panel  100 . 
     The first supply circuit  200   a  is mounted on the flexible printed circuit board  300   a  by a chip on film (COF) technology. The second supply circuit  200   b  is mounted on the flexible printed circuit board  300   b  by the COF technology. The flexible printed circuit board  300   a  is stacked on the flexible printed circuit board  300   b . The first supply circuit  200   a  is stacked on the second supply circuit  200   b . As described above, in this embodiment, the flexible printed circuit board  300   a  and the flexible printed circuit board  300   b  are attached to the electrooptical panel  100  such that a part of the flexible printed circuit board  300   a  and a part of the flexible printed circuit board  300   b  overlap in a direction (z direction) perpendicular to the display surface of the electrooptical panel  100 . 
     The electrooptical panel  100  includes a first input unit  110   a  and a second input unit  110   b . The first input unit  110   a  is an input terminal group. The first input unit  110   a  receives, for example, various signals output from the first supply circuit  200   a  via the flexible printed circuit board  300   a . The second input unit  110   b  is an input terminal group. The second input unit  110   b  receives, for example, various signals output from the second supply circuit  200   b  via the flexible printed circuit board  300   b . The electrooptical panel  100  is driven based on various signals received by the first input unit  110   a  and various signals received by the second input unit  110   b.    
     Wiring (not illustrated in  FIGS. 1 and 2 ) for transmitting signals is provided on the flexible printed circuit boards  300   a  and  300   b.    
     The first input unit  110   a  and the second input unit  110   b  of the electrooptical panel  100  are respectively connected to the connection terminal  300   a   1  of the flexible printed circuit board  300   a  and the connection terminal  300   b   1  of the flexible printed circuit board  300   b . The electrooptical panel  100  is connected to a control circuit as a higher circuit (not illustrated) via the flexible printed circuit board  300   a  and the first supply circuit  200   a  and via the flexible printed circuit board  300   b  and the second supply circuit  200   b.    
     The first supply circuit  200   a  and the second supply circuit  200   b  respectively receive image signals and various signals for driving control, from the control circuit via the flexible printed circuit boards  300   a  and  300   b . The first supply circuit  200   a  and the second supply circuit  200   b  respectively drive the electrooptical panel  100  via the flexible printed circuit boards  300   a  and  300   b.    
       FIG. 3  is a block diagram illustrating configurations of the electrooptical panel  100 , the first supply circuit  200   a , and the second supply circuit  200   b.    
     The electrooptical panel  100  includes a pixel unit  10  in which a plurality of pixels P IX  (pixel circuits) are arranged in a plane, a scanning line driving circuit  20 , and a distribution circuit group  21 . 
     In the pixel unit  10 , M scanning lines  12  and N signal lines  14  that intersect with each other via an insulating layer are formed (M is a natural number of two or more, and N is a number of 2K or more (K is a natural number of two or more)). The plurality of pixels P IX  are disposed corresponding to the intersections between the respective scanning lines  12  and the respective signal lines  14 . Therefore, the plurality of pixels P IX  are arranged in a matrix shape of M rows in the longitudinal direction×N columns in the transverse direction. The plurality of pixels P IX  display the gradation according to the potential of the signal lines  14  when the scanning lines  12  are selected. The scanning lines  12  extend from the scanning line driving circuit  20  along the row direction (x direction), and the signal lines  14  extend from the distribution circuit group  21  along the column direction (y direction). 
     Although the entire area of the pixel unit  10  may be used as a display effective area, a part of the peripheral portion of the pixel unit  10  may be used as a non-display area, and the scanning lines  12 , the signal lines  14 , and the pixels P IX  in the peripheral portion may be disposed as dummy scanning lines, dummy signal lines, and dummy pixels. 
     The N signal lines  14  in the pixel unit  10  are divided into J wiring groups (blocks) B[j] (j is a natural number of  1 J, J=N/K) each with K signal lines  14  as a unit. That is, the signal lines  14  are grouped for each wiring block B. The J wiring groups B[ 1 ] to B[J] correspond to J data lines  16 [ 1 ] to  16 [J] in a one-to-one correspondence. In this embodiment, since J is an even number of two or more and K signal lines  14  of one unit are adjacent to each other (continuously disposed), the odd-numbered wiring groups B[jodd] and the even-numbered wiring groups B[jeven] are alternately disposed. The odd-numbered wiring groups B[jodd] (jodd=1, 3, . . . , J−1) are an example of first signal line groups. The even-numbered wiring groups B[jeven] (jeven=2, 4, . . . , J) are an example of second signal line groups. Thus, the N signal lines  14  are included in the odd-numbered wiring groups B[jodd] (first signal line groups) and the even-numbered wiring groups B[jeven] (second signal line groups). Since the wiring groups B[jodd] as an example of the first signal line groups and the wiring groups B[jeven] as an example of the second signal line groups are alternately disposed, it is possible to make a difference in image quality between the pixel groups driven by data signals from the supply circuit inconspicuous. 
       FIG. 4  is a circuit diagram of each pixel P IX . Each pixel P Ix  is configured to include a liquid crystal element  42  and a selection switch  44 . The liquid crystal element  42  is an example of an electrooptical element. The liquid crystal element  42  is configured with a pixel electrode  421  and a common electrode  423  that are opposed to each other, and a liquid crystal  425  interposed between both electrodes. The transmittance of the liquid crystal  425  changes according to the voltage applied between the pixel electrode  421  and the common electrode  423 . 
     The selection switch  44  is configured with, for example, an N-channel type thin film transistor of which the gate is connected to the scanning line  12 . The selection switch  44  is interposed between the liquid crystal element (pixel electrode  421 ) and the signal line  14 , and controls the electrical connection (conduction/non-conduction) between the liquid crystal element  42  and the signal line  14 . The pixel P IX  (liquid crystal element  42 ) displays the gradation according to the potential (gradation potential V G  to be described later) of the signal line  14  when the selection switch  44  is controlled to be in a turned-on state. Auxiliary capacitors and the like connected in parallel to the liquid crystal element  42  are not illustrated. The configuration of the pixel P IX  can be appropriately changed. 
     Returning to  FIG. 3 , the control circuit  500  controls the scanning line driving circuit  20 , the first supply circuit  200   a , and the second supply circuit  200   b  by using various signals including a synchronization signal. For example, the control circuit  500  supplies a vertical synchronization signal V SYNC  that defines a vertical scanning period V and a horizontal synchronization signal H SYNC  that defines a horizontal scanning period, as illustrated in  FIG. 5 , to the scanning line driving circuit  20 , the first supply circuit  200   a , and the second supply circuit  200   b . Further, the control circuit  500  supplies image signals for designating the gradation of each pixel P IX  in a time-division manner, to the first supply circuit  200   a  and the second supply circuit  200   b . The scanning line driving circuit  20 , the first supply circuit  200   a , and the second supply circuit  200   b  cooperate with each other to control the display of the pixel unit  10 . 
     Typically, display data constituting one display screen is processed in a frame unit, and the processing period is one frame period (1F). The frame period F corresponds to the vertical scanning period V in a case where one display screen is formed by one vertical scanning. 
     As illustrated in  FIG. 5 , the scanning line driving circuit  20  sequentially selects the respective M scanning lines  12  according to the horizontal synchronization signal H SYNC , by sequentially outputting the scanning signals G[ 1 ] to G[M] to the respective M scanning lines  12  for each unit period U. The unit period U is set to the time length of one cycle of the horizontal synchronization signal H SYNC  (horizontal scanning period (1H)). 
     As illustrated in  FIG. 5 , the scanning signal G[m] supplied to the scanning line  12  of the m-th row (m-th line) is set to the high level (potential indicating selection of the scanning line  12 ) in the m-th unit period U among the M unit periods U of each vertical scanning period V. The period for which the scanning line  12  is selected is also called a line period, and in this embodiment, substantially corresponds to the unit period U. 
     When the scanning line driving circuit  20  selects the scanning line  12  of the m-th row, the respective selection switches  44  of the N pixels P IX  of the m-th row transition to the turned-on state. 
     As illustrated in  FIG. 5 , the unit period U includes a precharge period T PRE  and a write period T WRT . 
     The precharge period T PRE  is set before the start of the write period T WRT . In  FIG. 5 , although one precharge period T PRE  is set before the write period T WRT , a plurality (for example, two) of precharge periods T PRE  may be provided before the write period T WRT . 
     In the write period T WRT , the gradation potential V G  according to the designated gradation of each pixel P IX  is supplied to the respective signal line  14 . In the precharge period T PRE , predetermined precharge potential V PRE  (V PREa , V PREb ) is supplied to the respective signal line  14 . 
     The distribution circuit group  21  includes J distribution circuits  21 [ 1 ] to  21 [J]. The distribution circuits  21 [ 1 ] to  21 [J] respectively correspond to the wiring groups B[ 1 ] to B[J]. In this embodiment, a demultiplexer is used as each of the distribution circuits  21  [ 1 ] to  21 [J]. 
       FIG. 6  is a diagram illustrating an example of the distribution circuit group  21 , the first supply circuit  200   a , and the second supply circuit  200   b . In  FIG. 6 , as an example, the case of K=8 is illustrated. 
     The j-th distribution circuit  21 [j] is configured to include 8 switches  58 [ 1 ] to  58 [ 8 ] corresponding to the 8 signal lines  14  of the j-th wiring group B[j]. 
     The k-th (k=1 to 8) switch  58 [k] in the distribution circuit  21 [j] is interposed between the signal line  14  of the k-th column among the 8 signal lines  14  of the wiring group B[j] and the j-th data line  16  among the J data lines  16 , and controls the electrical connection (conduction/non-conduction) between the k-th signal line  14  and the j-th data line  16 . 
     The odd-numbered data lines  16  connect the first supply circuit  200   a  and the odd-numbered distribution circuits  21 [jodd] via the first input unit  110   a . The odd-numbered data lines  16  are an example of first data lines. The even-numbered data lines  16  connect the second supply circuit  200   b  and the even-numbered distribution circuits  21 [jeven] via the second input unit  110   b . The even-numbered data lines  16  are an example of second data lines. 
     The distribution circuits  21 [j] are connected to the first supply circuit  200   a  via four selection signal lines  61 [ 1 ],  61 [ 3 ],  61 [ 5 ] and  61 [ 7 ] in a selection signal line group  61 . The distribution circuits  21 [j] are connected to the second supply circuit  200   b  via four selection signal lines  61 [ 2 ],  61 [ 4 ],  61 [ 6 ] and  61 [ 8 ] in the selection signal line group  61 . 
     The first supply circuit  200   a  and the second supply circuit  200   b  generate data signals V ID [ 1 ] to V ID [J] based on the image signals from the control circuit  30 , and supply the data signals to the data lines  16 [ 1 ] to  16 [J]. The data signals V ID [ 1 ] to V ID [J] include data signals V ID [jodd] and data signals V ID [jeven]. 
     The first supply circuit  200   a  supplies the data signals V ID [jodd] including, in a time-division manner, potential to be supplied to the respective signal lines  14  in the wiring groups B[jodd] (first signal line groups), to the distribution circuits  21 [jodd] via the first input unit  110   a  and the jodd-th data lines  16 . The potential is an example of a signal. The jodd-th data lines  16  are an example of first data lines. The first supply circuit  200   a  respectively supplies the data signals V ID [jodd] in parallel. The data signals V ID [jodd] supplied from the first supply circuit  200   a  are an example of first data signals. 
     The second supply circuit  200   b  supplies the data signals V ID [jeven] including, in a time-division manner, potential to be supplied to the respective signal lines  14  in the wiring groups B[jeven] (second signal line groups), to the distribution circuits  21 [jeven] via the second input unit  110   b  and the jeven-th data lines  16 . The jeven-th data lines  16  are an example of second data lines. The second supply circuit  200   b  respectively supplies the data signals V ID [jeven] in parallel. The data signals V ID [jeven] supplied from the second supply circuit  200   b  are an example of second data signals. 
     The first data signals and the second data signals are so-called data signals, and are analog signals having different waveforms according to the display of an image, for example. 
     In this manner, the jodd-th data lines  16  as an example of the first data lines and the jeven-th data lines  16  as an example of the second data lines are alternately disposed side by side. In addition, since the first supply circuit  200   a  drives the odd-numbered wiring groups B[jodd] and the second supply circuit  200   b  drives the even-numbered wiring groups B[jeven], the pitch between the data lines  16  can be narrowed. Further, the first input unit  110   a  connected to the first supply circuit  200   a  and the second input unit  110   b  connected to the second supply circuit  200   b  are disposed side by side in the longitudinal direction (y direction) of the electrooptical panel  100 . As a result, it is possible to display a high-definition image without increasing the size of the electrooptical panel  100  in the transverse direction (x direction). 
     Selection signals SEL[k] are supplied to the selection signal line group  61 . The selection signals SEL[k] are timing signals for controlling the distribution of the data signals V ID [j] to the K signal lines  14  which belong to each wiring group B[j]. 
     The first supply circuit  200   a  outputs four first selection signals SEL 1 [ 1 ], SEL 1 [ 3 ], SEL 1 [ 5 ], and SEL 1 [ 7 ] for distributing the data signals V ID [j] to the respective signal lines  14  in the wiring groups B[j], to the distribution circuit group  21 . The first supply circuit  200   a  generates and outputs the four first selection signals. The first selection signals SEL 1 [k] are the selection signals SEL[k] output from the first supply circuit  200   a.    
     The second supply circuit  200   b  outputs four second selection signals SEL 2 [ 2 ], SEL 2 [ 4 ], SEL 2 [ 6 ], and SEL 2 [ 8 ] for distributing the data signals V ID [j] to the respective signal lines  14  in the wiring groups B[j], to the distribution circuit group  21 . The second supply circuit  200   b  generates and outputs the four second selection signals. The second selection signals SEL 2 [k] are the selection signals SEL[k] output from the second supply circuit  200   b.    
     In this embodiment, the first selection signals SEL 1 [k] and the second selection signals SEL 2 [k] are signals having the same waveform, and are pulse signals for turning on the switches  58 [k] in the distribution circuits  21 [j] for a predetermined time. 
     The first supply circuit  200   a  and the second supply circuit  200   b  use the same driver IC as an example, and each of the first supply circuit  200   a  and the second supply circuit  200   b  has a function of supplying eight selection signals. Therefore, in a case where the distribution circuit group  21  and the first supply circuit  200   a  are connected to each other by eight selection signal lines  61 , the first supply circuit  200   a  can supply the eight selection signals via the eight selection signal lines  61 . In addition, in a case where the distribution circuit group  21  and the second supply circuit  200   b  are connected to each other by eight selection signal lines  61 , the second supply circuit  200   b  can supply the eight selection signals via the eight selection signal lines  61 . 
     In this embodiment, the first supply circuit  200   a  is connected to the distribution circuit group  21  by four selection signal lines  61 [ 1 ],  61 [ 3 ],  61 [ 5 ], and  61 [ 7 ] (first selection signal lines) corresponding to the odd-numbered (refer to  FIG. 5 ) selection signals SEL 1 [ 1 ], SEL 1 [ 3 ], SEL 1 [ 5 ], and SEL 1 [ 7 ], among the eight selection signal lines  61 . In addition, the second supply circuit  200   b  is connected to the distribution circuit group  21  by four selection signal lines  61 [ 2 ],  61 [ 4 ],  61 [ 6 ], and  61 [ 8 ] (second selection signal lines) corresponding to the even-numbered (refer to  FIG. 5 ) selection signals SEL 2 [ 2 ], SEL 2 [ 4 ], SEL 2 [ 6 ], and SEL 2 [ 8 ], among the eight selection signal lines  61 . 
     In the example of  FIG. 6 , the first distribution circuit  21 [ 1 ] and the second distribution circuit  21 [ 2 ] in the distribution circuit group  21  are illustrated. The first selection signal lines  61 [ 1 ],  61 [ 3 ],  61 [ 5 ], and  61 [ 7 ] and the second selection signal lines  61 [ 2 ],  61 [ 4 ],  61 [ 6 ], and  61 [ 8 ] are connected to the first distribution circuit  21 [ 1 ] in the distribution circuit group  21  so as to alternately correspond to the respective signal lines  14  in the wiring group B[ 1 ] as the first signal line group. Similarly, the first selection signal lines  61 [ 1 ],  61 [ 3 ],  61 [ 5 ], and  61 [ 7 ] and the second selection signal lines  61 [ 2 ],  61 [ 4 ],  61 [ 6 ], and  61 [ 8 ] are connected to the second distribution circuit  21 [ 2 ] in the distribution circuit group  21  so as to alternately correspond to the respective signal lines  14  in the wiring group B[ 2 ] as the second signal line group. 
     In  FIG. 6 , although the case where K is 8 is illustrated as an example, the number of the selection signal lines  61  will be described using K as follows. Assuming that the number of the selection signal lines  61  connecting the second supply circuit  200   b  and the distribution circuit group  21  is P (P is a natural number of one or more), the first supply circuit  200   a  is connected to the distribution circuit group  21  by the K-P selection signal lines  61  (first selection signal lines). On the other hand, the second supply circuit  200   b  is connected to the distribution circuit group  21  by the P selection signal lines  61  (second selection signal lines). In the example of  FIG. 6 , the case where P (=4) is set to K/2 (8/2=4) is illustrated, and the number of the first selection signal lines is equal to the number of the second selection signal lines. 
     The first supply circuit  200   a  supplies the first selection signals SEL 1 [ 1 ], SEL 1 [ 3 ], SEL 1 [ 5 ] and SEL 1 [ 7 ] corresponding to the odd-numbered switches  58 [ 1 ],  58 [ 3 ],  58 [ 5 ], and  58 [ 7 ] in the distribution circuit group  21 , via the first input unit  110   a  and the selection signal lines  61 [ 1 ],  61 [ 3 ],  61 [ 5 ], and  61 [ 7 ]. The second supply circuit  200   b  supplies the second selection signals SEL 2 [ 2 ], SEL 2 [ 4 ], SEL 2 [ 6 ] and SEL 2 [ 8 ] corresponding to the even-numbered switches  58 [ 2 ],  58 [ 4 ],  58 [ 6 ], and  58 [ 8 ] in the distribution circuit group  21 , via the second input unit  110   b  and the selection signal lines  61 [ 2 ],  61 [ 4 ],  61 [ 6 ], and  61 [ 8 ]. 
     The supply of the first selection signals SEL 1 [ 1 ], SEL 1 [ 3 ], SEL 1 [ 5 ], and SEL 1 [ 7 ] and the second selection signals SEL 2 [ 2 ], SEL 2 [ 4 ], SEL 2 [ 6 ], and SEL 2 [ 8 ] from the first supply circuit  200   a  and the second supply circuit  200   b  is controlled by the control circuit  500 . In this embodiment, the first selection signal SEL 1 [ 1 ], the second selection signal SEL 2 [ 2 ], the first selection signal SEL 1 [ 3 ], the second selection signal SEL 2 [ 4 ], the first selection signal SEL 1 [ 5 ], the second selection signal SEL 2 [ 6 ], the first selection signal SEL 1 [ 7 ], and the second selection signal SEL 2 [ 8 ] are supplied in this order. In this manner, the control circuit  500  does not supply the second selection signals when the first selection signals are supplied, and does not supply the first selection signals when the second selection signals are supplied. That is, the control circuit  500  exclusively supplies the first selection signals and the second selection signals. 
     The distribution circuits  21 [jodd] included in the distribution circuit group  21  distribute the data signals V ID [jodd] to the respective eight signal lines  14  in the wiring groups B[jodd], by using the selection result of the first supply circuit  200   a  and the second supply circuit  200   b . The distribution circuits  21 [jeven] included in the distribution circuit group  21  distribute the data signals V ID [jeven] to the respective eight signal lines  14  in the wiring groups B[jeven], by using the selection result of the first supply circuit  200   a  and the second supply circuit  200   b.    
     Next, an outline of the operation of the electrooptical device  1  will be described. 
     The first supply circuit  200   a  generates the data signals V ID [jodd] (first data signals) that designate, in a time-division manner, the gradation of the pixels P IX  corresponding to the respective signal lines  14  in the wiring groups B[jodd]. 
     The second supply circuit  200   b  generates the data signals V ID [jeven] (second data signals) that designate, in a time-division manner, the gradation of the pixels P IX  corresponding to the respective signal lines  14  in the wiring groups B[jeven]. 
     The first supply circuit  200   a  further generates the first selection signals SEL 1 [ 1 ], SEL 1 [ 3 ], SEL 1 [ 5 ], and SEL 1 [ 7 ]. The second supply circuit  200   b  generates the second selection signals SEL 2 [ 2 ], SEL 2 [ 4 ], SEL 2 [ 6 ], and SEL 2 [ 8 ]. 
     The control circuit  500  controls the supply of the first selection signals and the second selection signals. The order of the supply is the order of the first selection signal SEL 1 [ 1 ], the second selection signal SEL 2 [ 2 ], the first selection signal SEL 1 [ 3 ], the second selection signal SEL 2 [ 4 ], the first selection signal SEL 1 [ 5 ], the second selection signal SEL 2 [ 6 ], the first selection signal SEL 1 [ 7 ], and the second selection signal SEL 2 [ 8 ]. 
     The distribution circuit group  21  distributes the data signals V ID [jodd] to the respective signal lines  14  in the wiring groups B[jodd], by using the first selection signals SEL 1 [ 1 ], SEL 1 [ 3 ], SEL 1 [ 5 ], and SEL 1 [ 7 ] and the second selection signals SEL 2 [ 2 ], SEL 2 [ 4 ], SEL 2 [ 6 ], and SEL 2 [ 8 ]. Further, the distribution circuit group  21  distributes the data signals V ID [jeven] to the respective signal lines  14  in the wiring groups B[jeven]. 
     According to this embodiment, the second selection signals are not supplied when the first selection signals are supplied, and the first selection signals are not supplied when the second selection signals are supplied. Therefore, it is possible to equally distribute the load of the supply of the selection signals in the supply circuits to the first supply circuit  200   a  and the second supply circuit  200   b . As a result, it is possible to effectively prevent deterioration in image display, compared to a case where the selection signals are supplied by a single supply circuit. The first selection signals and the second selection signals are pulse signals, and noise in the GND potential may occur at the rising edges and the falling edges of the pulse signals. However, as in this embodiment, the supply of the selection signals is distributed by the first supply circuit  200   a  and the second supply circuit  200   b , and thus it is possible to prevent the occurrence of noise in each of the first supply circuit  200   a  and the second supply circuit  200   b . In addition, as described above, the number of the first selection signals and the number of the second selection signals are both set to four, and the first selection signals and the second selection signals are equally distributed by the first supply circuit  200   a  and the second supply circuit  200   b . Therefore, it is possible to prevent a difference in load between when the first supply circuit  200   a  supplies the first selection signals and when the second supply circuit  200   b  supplies the second selection signals. Thus, it is possible to prevent the occurrence of a difference such as a decrease in luminance. 
     In this embodiment, although the N signal lines  14  are divided into the J wiring groups B[j] each with the K signal lines  14  as one unit that are continuously disposed in the transverse direction, the N signal lines  14  may be divided into the J wiring groups B[j] each with the K signal lines  14  as one unit that are not continuously disposed in the transverse direction. For example, the signal lines  14  which belong to the wiring groups B[jodd] and the signal lines  14  which belong to the wiring groups B[jeven] may be alternately disposed. The odd-numbered signal lines  14  belong to the wiring groups B[jodd], and the even-numbered signal lines  14  belong to the wiring groups B[jeven]. Even in this case, it can be said that the wiring groups B[jodd] and the wiring groups B[jeven] are odd-numbered wiring groups and even-numbered wiring groups. 
     The first data signals and the first selection signals are signals supplied from the first supply circuit  200   a . The first signal line groups, the first data lines, and the first selection signal lines are wiring and wiring groups to which the signals from the first supply circuit  200   a  are supplied. In addition, the second data signals and the second selection signals are signals supplied from the second supply circuit  200   b . The second signal line groups, the second data lines, and the second selection signal lines are wiring and wiring groups to which the signals from the second supply circuit  200   b  are supplied. 
     MODIFICATION EXAMPLE 
     The above embodiments can be modified in a variety of other forms. Specific modification forms are exemplified below. Two or more forms arbitrarily selected from the following examples can be appropriately combined unless the forms are inconsistent with each other. 
     Modification Example 1 
     In the above-described embodiment, the number K-P of the first selection signal lines connected to the first supply circuit  200   a  and the number P of the second selection signal lines connected to the second supply circuit  200   b  are set to be equal to each other, P being set to K/2. However, the invention is not limited to such a configuration, and P may be set to a number other than K/2. Even in this case, it is possible to distribute the load of the supply of the selection signals in the supply circuits to the first supply circuit  200   a  and the second supply circuit  200   b . As a result, it is possible to effectively prevent deterioration in image display, compared to a case where the selection signals are supplied by a single supply circuit. 
     Modification Example 2 
     In the above-described embodiment, although the first supply circuit  200   a  and the second supply circuit  200   b  capable of originally supplying the K (=8) selection signals are used, a first supply circuit  200   a  and a second supply circuit  200   b  capable of supplying K (=4) selection signals from the beginning may be used. In this case, it is possible to reduce the chip area of the first supply circuit  200   a  and the second supply circuit  200   b . In a case where the chip area is the same as that of the first supply circuit  200   a  and the second supply circuit  200   b  capable of supplying K (=8) selection signals, since it is sufficient to supply K (=4) selection signals, it is possible to increase the size of an output transistor. As a result, it is possible to ensure a sufficient driving capability corresponding to a panel with high resolution. 
     Modification Example 3 
     In the above-described embodiments, as illustrated in  FIGS. 1 and 2 , a configuration in which the flexible printed circuit board  300   a  and the flexible printed circuit board  300   b  are attached so as to overlap each other when viewed from the display direction (z direction) of the electrooptical panel  100  is described. However, the invention is not limited to such a configuration. For example, as illustrated in  FIG. 7 , the connection terminal  300   a   1  for connecting the flexible printed circuit board  300   a  and the connection terminal  300   b   1  for connecting the flexible printed circuit board  300   b  may be disposed on the electrooptical panel  100  side by side in the transverse direction (x direction) of the electrooptical panel  100 . In this case, it is easy to mount the flexible printed circuit board  300   a  and the flexible printed circuit board  300   b  on the electrooptical panel  100 . However, in this example, compared to the configuration in which the connection terminal  300   a   1  and the connection terminal  300   b   1  illustrated in  FIGS. 1 and 2  are disposed in the longitudinal direction (y direction), there is a case where mounting regions of the flexible printed circuit board  300   a  and the flexible printed circuit board  300   b  become larger with respect to the pixel unit  10 , or a case where the wiring connecting the pixel unit  10  and the mounting regions becomes longer. 
     Modification Example 4 
     The number of the wiring boards connected to the electrooptical panel  100  is not limited to two. Three or more wiring boards may be connected to the electrooptical panel  100 . Even in this case, the supply circuits of the respective wiring boards output the selection signals such that the load is equally distributed. 
     Modification Example 5 
     In the example of  FIG. 3 , an example in which one end of the selection signal line group  61  is connected to the first supply circuit  200   a  or the second supply circuit  200   b  and in which the first selection signals and the second selection signals are supplied is described. However, both ends of the selection signal line group  61  may be connected to the first supply circuit  200   a  or the second supply circuit  200   b . In this case, the first selection signals SEL 1  and the second selection signals SEL 2  may be supplied from both ends of the selection signal line group  61 . Also, the first selection signals SEL 1  may be supplied from one end of the selection signal line group  61 , and the second selection signals SEL 2  may be supplied from the other end of the selection signal line group  61 . 
     APPLICATION EXAMPLE 
     The electrooptical device  1  exemplified in each of the above embodiments and modification examples can be used for various electronic apparatuses.  FIG. 8  illustrates a specific form of an electronic apparatus in which the electrooptical device  1  is adopted. 
       FIG. 9  is a schematic diagram of a projection type display apparatus (three plate type projector)  4000  to which the electrooptical device  1  is applied. The projection type display apparatus  4000  is configured to include three electrooptical devices  1  ( 1 R,  1 G, and  1 B) corresponding to different display colors (red, green, and blue). An illumination optical system  4001  supplies red components r among light emitted from an illumination device (light source)  4002  to the electrooptical device  1 R, supplies green components g to the electrooptical device  1 G, and supplies blue components b to the electrooptical device  1 B. Each of the electrooptical devices  1  functions as an optical modulator (light valve) that modulates monochromatic light supplied from the illumination optical system  4001  according to the display image. A projection optical system  4003  combines the light emitted from the respective electrooptical panels  100  and projects the combined light on a projection surface  4004 . The electrooptical device  1  is applied, and thus it is possible to realize a compact projection type display apparatus  4000  capable of high-definition display. 
     The electronic apparatuses to which the electrooptical device according to the invention is applied include a portable personal computer, a personal digital assistants (PDA), a digital still camera, a television, a video camera, and a car navigation device, in addition to the apparatus illustrated in  FIG. 9 . Further, the electronic apparatuses include an in-vehicle display apparatus (instrument panel), an electronic organizer, an electronic paper, a calculator, a word processor, a workstation, a video phone, a POS terminal, a printer, a scanner, a copier, a video player, an apparatus including a touch panel, and the like. 
     The entire disclosure of Japanese Patent Application No. 2016-146171, filed Jul. 26, 2016 is expressly incorporated by reference herein.