JP2010026085A - Driving device and method for electrooptical device, electrooptical device, and electronic apparatus - Google Patents

Abstract

In a drive device of an electro-optical device that performs subfield drive, tone reproduction is improved while suppressing the occurrence of pseudo contour noise.
An electro-optical device includes a scanning line 14a, a data line 14b, and a pixel portion 14c that intersect each other. The driving device includes a scanning signal supply means 11 for supplying a scanning signal at the same time for each of n (where n is a natural number of 2 or more) scanning lines, and a sub-field unit image signal via a data line. And image signal supply means 12 for supplying a plurality of times during the i-th selection period supplied via the i-th (where i is a natural number) scan line.
[Selection] Figure 1

Description

  The present invention relates to a driving apparatus and method for an electro-optical device that performs gradation display control by a subfield driving method, and to an electro-optical device and an electronic apparatus.

  This type of driving device is a digital subfield driving method in which one field is divided into a plurality of subfields on the time axis, and an on voltage or an off voltage is applied to each pixel in each subfield according to the gradation. There is a device to drive. In displaying a moving image, if a subfield to which an on-voltage is applied in one field is shifted to a specific position on the time axis, pseudo contour noise is generated, and the image quality of the display image is significantly reduced. A technique is disclosed in which subfields are provided so that subfields to which an on voltage or an off voltage are applied are appropriately dispersed in one field.

JP 2004-325996 A

  However, in the method described in Patent Document 1 described above, it is necessary to sequentially determine the arrangement pattern of the subfields to which the on voltage or the off voltage is applied, so that the load on the driving element is large and the moving image display speed is increased. It becomes difficult to do. In particular, if the number of gradations that can be expressed is increased, it is necessary to increase the scanning speed of the screen in order to increase the number of subfields, and the addition to the driving element is further increased. For this reason, the method in the background art has a technical problem that it is practically difficult to realize a high-quality image display apparatus with a large number of gradations while suppressing pseudo contour noise.

  The present invention has been made in view of the above points, and uses a sub-field driving method to suppress the generation of pseudo contour noise and improve the gradation reproducibility. It is an object to provide a driving method and an electronic device.

  In order to solve the above problems, a first driving device of an electro-optical device according to the present invention provides a plurality of scanning lines and a plurality of data lines and a plurality of the scanning lines and a plurality of data that are wired so as to cross the image display area. An electro-optical device driving device that subfield-drives an electro-optical device including a plurality of pixel units arranged so as to correspond to the intersections of the lines, the plurality of scanning lines passing through the plurality of scanning lines. Of these, n (where n is a natural number equal to or greater than 2) scanning lines simultaneously, scanning signal supply means for supplying scanning signals, and a plurality of data obtained by dividing one frame on the time axis via the plurality of data lines. The image signal is supplied a plurality of times during the i-th selection period in which the scanning signal is supplied via the i-th (where i is a natural number) scanning line among the plurality of scanning lines. And supply means .

  According to the first driving device of the present invention, when various signals such as a power supply signal, a data signal, and a control signal are input / output, the scanning line driving circuit formed on the substrate is included. The scanning signal supply means supplies the scanning signal to the pixel portion, for example, line-sequentially via a plurality of scanning lines. In parallel with this, an image signal is supplied to the pixel portion simultaneously or sequentially via a plurality of data lines by an image signal supply means including a data line driving circuit, a sampling circuit, etc. built on the substrate, for example. The Here, the “pixel portion” is arranged in a matrix in an image display area on a substrate, for example, and an electro-optical material such as liquid crystal is sandwiched between a pair of substrates, and active driving is performed by a pixel switching TFT. The For example, when a scanning signal is applied to the gate terminal of the pixel switching TFT, an image signal supplied from the data line is written to the pixel electrode constituting the pixel portion via the source / drain of the pixel switching TFT. As a result, for example, a driving voltage corresponding to an image signal is applied between the pixel electrode constituting the pixel portion and the counter electrode, and the operation state of the electro-optical material such as the alignment state of the liquid crystal is changed.

  Here, particularly in the present invention, the “scanning signal supply means” supplies scanning signals simultaneously to n, that is, two or more scanning lines among a plurality of scanning lines. That is, the pixel portions on the n scanning lines arranged in the direction along the scanning line are driven simultaneously. On the other hand, among the driven pixel portions, the pixel portions arranged in the same column along the data line are supplied with image signals by the same data line, so that the plurality of columns are arranged in the direction along the scanning line. The same image signal is supplied to a plurality of pixel portions arranged in a row. As a result, the same image signal is supplied to the pixel portions on the n scanning lines. With this configuration, image signals are prevented from concentrating on a specific area of the image display area. That is, it becomes possible to suppress pseudo contour noise that is generated by supplying a group of image signals to a specific display area.

  Since the same image signal is supplied to pixels on n different scanning lines as described above, the resolution in the vertical direction (direction along the data line) is naturally lowered. That is, the resolution is lost for one pixel in the vertical direction. For example, when scanning signals are simultaneously supplied to two adjacent scanning lines, two pixels adjacent in the vertical direction are substantially equal to one. It will function as a single pixel, resulting in a coarse resolution of 1/2. In other words, the present invention suppresses pseudo contour noise at the expense of such a decrease in resolution. However, generally similar image signals are supplied to the pixels on the adjacent scanning lines in the image display area, so that a sufficiently high visual resolution is ensured if the number of subfields is set to be increased to some extent. It is possible easily. The increase in the number of subfields can be realized by “image signal supply means” described below.

  The number of scanning lines that simultaneously supply scanning signals is typically two (n = 1), but the scanning signals may be supplied to three or more (n is 3 or more) scanning lines. However, as described above, the resolution in the vertical direction becomes coarser as the number of scanning lines that simultaneously supply scanning signals increases. Therefore, the number of scanning lines to be driven at the same time may be determined according to the number of subfields that can be set so that the reduction in resolution is not noticeable visually.

  The “image signal supply unit” supplies the image signal a plurality of times through the data line while the scanning signal is being supplied to a specific i-th scanning line among the plurality of scanning lines. That is, while one scanning line is selected, the image signal written to one pixel portion connected to the scanning line is changed. The “i-th selection period” means a period during which a scanning signal is supplied to a specific i-th scanning line among a plurality of scanning lines, that is, one horizontal scanning period. Note that, in the i-th selection period, typically, the scanning signal is kept high, but after the scanning signal is made high, the scanning signal is once made low and then made high again. As long as the scanning signal is supplied to the line, that is, the same scanning line is continuously selected (that is, there is no change in the scanning line to which the scanning signal is supplied), the high / low of the scanning signal is changed or not. It doesn't matter about changes.

  The “image signal” is typically a digital on-voltage or off-voltage used in sub-field driving. When this is applied to each pixel, digital driving, that is, sub-field driving is performed. As described above, the image signal is written a plurality of times in the i-th selection period, so that the ON voltage and the OFF voltage of the image signal are appropriately switched within one selection period. It is driven by subfield. In other words, one selection period does not correspond to one subfield, but one selection period corresponds to a plurality of subfields or is divided. In other words, if one pixel is substantially divided into a plurality of subfields on the time axis by repeating inversion driving of pixels by writing image signals a plurality of times during the i-th selection period for all scanning lines. Can be considered equivalent to. In general, when the number of subfields in one frame is increased, a method of increasing the scanning speed of the scanning line is generally used. However, in this case, there is a limit to the speed at which the driving element is switched on / off. However, by supplying a plurality of image signals in the i-th selection period by the “image signal supply means” as described above, the number of subfields can be easily increased without increasing the scanning speed of the scanning lines. . As a result, it is possible to secure a sufficient number of subfields that can compensate for the decrease in resolution in the vertical direction caused by the “scanning signal supply means”.

  As described above, the same image signal is supplied to pixels on a plurality of scan lines that are moderately separated, and the number of subfields is increased, thereby suppressing the occurrence of pseudo contour noise and having sufficient resolution. A high-quality drive device can be realized.

  In another aspect of the first driving apparatus of the present invention, the scanning signal supply means simultaneously includes two scanning lines separated from each other by m (where m is a natural number) as the n scanning lines. The scanning signal is supplied.

  According to this aspect, since the image signals can be more dispersed in the image display area as the two scanning lines supplying the scanning signals are separated from each other at the same time, it is possible to more effectively suppress the generation of pseudo contour noise. It becomes. However, if the two scanning lines that supply the scanning signal are separated at the same time, the same image signal is supplied to the pixels at the distant positions, and this causes a reduction in resolution. That is, if the value of m is increased, as in the case where the number of scanning lines for supplying scanning signals is increased, the pseudo contour noise can be more effectively suppressed, but the resolution of the display image is reduced. End up. In this case as well, a decrease in resolution can be compensated for by sufficiently securing the number of subfields in one frame and increasing the number of gradations. For this reason, the distance between the two scanning lines that are driven simultaneously (that is, the value of m) may be determined so that the resolution is not noticeable visually, depending on the number of subfields that can be set.

  Note that it is desirable to supply scanning signals to two scanning lines that are adjacent to each other (that is, when m = 1) in order to suppress the reduction in resolution as much as possible. Alternatively, the scanning signal may be supplied, for example, line-sequentially at the same time for each of three or more scanning lines including two scanning lines separated from each other by m lines.

  In another aspect of the first driving device of the present invention, the image signal supply means corresponds to the gradation to be displayed for each of the plurality of pixel portions for each of the plurality of subfields as the image signal. Supply on-voltage or off-voltage.

  According to this aspect, digital driving (subfield driving) is performed by applying a data signal based on binary values of an on voltage and / or an off voltage corresponding to the gradation to be displayed on the pixel in each subfield. That is, by applying an on-voltage or an off-voltage to each pixel in each subfield, that is, an image signal having a halftone potential is not supplied, display by an on-voltage (that is, white or black) in each pixel portion. ) And the display by the off-voltage (that is, black or white), a plurality of visual gradations are realized. For example, if one frame is divided into M subfields, the number of realizable gradations is M + 1.

  Note that in which subfield the ON voltage and / or the OFF voltage is applied based on the image signal may be determined in advance by preparing a code pattern stored in a storage device such as a memory.

  In another aspect of the first driving apparatus of the present invention, the image signal supply means outputs a plurality of the image signals during the i-th selection period for at least one subfield of the plurality of subfields. The image signal is supplied only once during the i-th selection period for the other subfields except the at least one subfield among the plurality of subfields.

  According to this aspect, the image signal supply means supplies the image signal a plurality of times during the i-th selection period in at least two or more subfields among the subfields. In this way, a specific subfield can be further divided into subfields depending on the supply timing of the image signal. Therefore, the number of subfields can be easily increased, and the number of scanning lines that supply scanning signals at the same time is increased (that is, when n is increased), or the interval between the scanning lines that are supplied is increased (that is, n). , When m is increased), it is possible to secure a sufficient number of gradations even when the resolution is reduced. As a result, it is possible to realize a high-quality drive device having sufficient resolution while suppressing the generation of pseudo contour noise more effectively. It should be noted that a subfield that is not supplied with a plurality of floors may be included.

  In another aspect of the first drive device of the present invention, the image signal supply means supplies the image signal continuously a plurality of times during the i-th selection period.

  According to this aspect, the number of subfields can be increased very easily only by increasing the number of image signals supplied continuously in the i-th selection period. Further, since no extra signal or the like is contained between each of the supplied image signals, the period of each subfield can be extremely shortened. As a result, the number of subfields in one field can be dramatically increased. At the same time, the number of scanning lines for supplying scanning signals can be increased (that is, when n is increased), Even when the resolution is lowered by increasing the interval (that is, when m is increased), a sufficient number of gradations can be ensured. As a result, it is possible to realize a high-quality drive device having sufficient resolution while suppressing the generation of pseudo contour noise very efficiently.

  In another aspect of the first drive device of the present invention, the image signal supply means supplies the image signal discontinuously a plurality of times during the i-th selection period.

  In this aspect, by adjusting the timing at which the image signal is supplied by the image signal supply means, an arbitrary waiting time between two temporally adjacent image signals among the plurality of image signals supplied to each pixel. Is provided. That is, by providing such a waiting time, the time width of each subfield can be arbitrarily adjusted, and the number of gradations that can be displayed can be increased with respect to the number of subfields. As a result, even if the number of scanning lines that supply scanning signals at the same time is increased or the interval between the scanning lines to be supplied is increased, high-quality that can suppress pseudo contour noise while having sufficient resolution. Can be realized.

  In another aspect of the first drive device of the present invention, the image signal supply means supplies the image signal a plurality of times at equal intervals in the i-th selection period.

  According to this aspect, the image signal is supplied for each time obtained by equally dividing one horizontal time. Therefore, it is possible to efficiently arrange subfields having a specific period within one horizontal time, and it is possible to more easily drive high-quality driving that can suppress pseudo contour noise while having sufficient resolution. An apparatus can be realized.

  In another aspect of the first drive device of the present invention, the image signal supply means supplies the image signal a plurality of times at unequal intervals or at arbitrary intervals in the i-th selection period.

  In this aspect, the timing for supplying the image signal by the image signal supply means can be arbitrarily adjusted. That is, one horizontal period can be divided into subfields having various periods, and the number of gradations that can be displayed can be increased with respect to the number of subfields.

  In another aspect of the first driving apparatus of the present invention, the scanning signal supply means is alternately arranged on the scanning lines separated by k (k is a natural number of 2 or more) among the plurality of scanning lines, The scanning signal is supplied simultaneously for each of n scanning lines, and the image signal supply means supplies the image signal in synchronization with the scanning signal.

  With this configuration, it is possible to drive a plurality of scanning lines that are separated vertically in the image display area alternately and simultaneously. Then, by supplying an image signal to the data line in synchronization with the scanning signal for driving the scanning line, scanning (that is, area scanning) can be executed for each of the plurality of areas. This makes it possible to more efficiently provide a large number of subfields in one frame, and at the same time, increase the number of scanning lines that supply scanning signals, or increase the interval between the scanning lines that supply them. However, it is possible to realize a high-quality drive device that has sufficient resolution and can suppress pseudo contour noise.

  In this aspect, the scanning signal supply means may scan the same scanning line among the plurality of scanning lines before and after the order of changing the scanning lines separated by k from each other. The scanning signal may be supplied through a line.

  With this configuration, the scanning signal used to drive a plurality of scanning lines separated vertically in the image display area is the same before and after the order of changing the plurality of areas is completed. Are supplied to the scanning lines. That is, one scanning line is driven by a plurality of scanning signals supplied one after the other on the time axis. Here, in the present invention, “the scanning signal” may be “supplied” is not always supplied, and the scanning signal is supplied in such a special format at intervals on a predetermined cycle or time axis. It means to generate a state to do. If the scanning signal is supplied to the same scanning line, the vertical scanning does not move at all. For this reason, the supply of the scanning signal to the next scanning line, that is, the shift in the vertical direction is appropriately executed at a predetermined frequency.

  By shifting the scanning lines driven in this way, for example, line-sequentially, the number of gradations can be increased by subfield driving in area scanning. Also in this case, the pseudo contour noise can be effectively suppressed by supplying the scanning signal to n scanning lines separated by m from the scanned scanning line.

  In order to solve the above-described problem, a second driving device of the electro-optical device according to the present invention provides a plurality of scanning lines and a plurality of data lines, and a plurality of the scanning lines and a plurality of data that are wired so as to cross the image display area. An electro-optical device driving device that subfield-drives an electro-optical device including a plurality of pixel units arranged so as to correspond to the intersections of the lines, the plurality of scanning lines passing through the plurality of scanning lines. Of these scanning lines, n (where n is a natural number of 2 or more) scanning lines are simultaneously transferred to scanning lines separated by k (where k is a natural number of 2 or more) of the plurality of scanning lines. A scanning signal supply means for supplying and an image signal supply for supplying a plurality of subfield unit image signals obtained by dividing one frame on the time axis in synchronization with the scanning signal via the plurality of data lines Means, The inspection signal supply means passes through the same scanning line among the plurality of scanning lines before and after the order of changing the scanning lines separated by k from the plurality of scanning lines. The scanning signal may be supplied.

  According to the second driving device of the present invention, during the operation, the scanning signal supply unit supplies the scanning signal to the pixel portion, for example, in a line sequential manner via the plurality of scanning lines. In parallel with this, an image signal is supplied to the driven pixel portion by the image signal supply means simultaneously or sequentially via a plurality of data lines.

  The scanning signal is supplied by, for example, line-sequentially through the plurality of scanning lines alternately by a plurality of areas obtained by dividing the image display area by dividing lines along the scanning lines by the scanning signal supply means. In addition, at this time, the scanning signal is supplied through the same scanning line among the plurality of scanning lines before and after the order of changing the plurality of areas is completed. Therefore, scanning (that is, region scanning) can be executed for each of a plurality of regions. In addition, at this time, since the scanning signal is supplied through the same scanning line before and after the order of changing the plurality of regions is completed, the number of gradations is increased by subfield driving in the region scanning. It becomes possible.

  Note that, for one of a plurality of regions that are vertically separated on the image display region, a scanning signal is supplied through the same scanning line before and after the order of changing the plurality of regions is completed. In the other area, the scanning signal may be continuously supplied twice through the same scanning line. That is, for one region, when the order in which its own scanning is performed comes, the scanning signal is supplied only once to the scanning line, and when the order in which the next own scanning is performed comes. The scanning signal is supplied once again to the same scanning line. The other region may be configured such that the scanning signal is continuously supplied twice to the same scanning line when the order in which the scanning is performed comes.

  Note that after the supply of the scanning signal to the same scanning line, the scanning signal is appropriately supplied to the next scanning line so as to be performed alternately for each region.

  In the present invention, in particular, a scanning signal is supplied to one scanning line, for example, line-sequentially, and at the same time, a scanning signal is supplied to one or more other scanning lines. For example, by supplying scanning signals simultaneously to scanning lines that are adjacent to scanning lines that are line-sequentially driven as described above, it is possible to prevent image signals from concentrating on a specific area and to suppress the generation of pseudo contour noise. be able to. On the other hand, as with the first driving device, a decrease in resolution also becomes a problem at the same time, but since the number of gradations can be increased by increasing the number of subfields as described above, it is visually sufficient. It becomes possible to ensure the resolution easily.

  Thus, according to the second drive device, it is possible to realize a high-quality drive device that has sufficient resolution and can suppress pseudo contour noise.

  In an aspect of the second driving device, the scanning signal supply means may be configured to detect the scanning lines while the order of changing the scanning lines separated by k from the scanning lines is once. Of these, the scanning signal may be supplied through the same scanning line.

  According to this aspect, the scanning signal can be supplied via the same scanning line before and after the order in which the scanning lines that are separated from each other in the vertical direction on the image display area are changed by one cycle, and the other area. With respect to, a scanning signal can be continuously supplied twice via the same scanning line. It should be noted that such an operation in one region and the other region may be executed alternately in one region, and may also be executed alternately in the other region at a timing corresponding thereto.

  In another aspect of the second driving device, the image signal supply means may perform before and after the order of changing the scanning lines separated by k from each other among the plurality of scanning lines. The image signal is supplied at regular intervals.

  According to this aspect, since the period of each subfield becomes equal, a plurality of subfields can be efficiently arranged in one frame.

  It should be noted that the second drive device can adopt the same mode as the above-described first drive device of the present invention as appropriate.

  In order to solve the above-described problem, the first driving method of the electro-optical device according to the present invention provides a plurality of scanning lines and a plurality of data lines and a plurality of the scanning lines and a plurality of data that are wired so as to intersect with the image display region. An electro-optical device driving method for sub-field-driving an electro-optical device including a plurality of pixel units arranged so as to correspond to intersections of lines, wherein the plurality of scanning lines are connected via the plurality of scanning lines. Of these, n (where n is a natural number greater than or equal to 2) scanning lines are simultaneously provided with a scanning signal supplying step for supplying a scanning signal, and one frame is divided on the time axis via the plurality of data lines. An image that supplies a plurality of subfield unit image signals a plurality of times during an i-th selection period in which the scanning signal is supplied via the i-th (where i is a natural number) scanning line among the plurality of scanning lines. With signal supply process That.

  According to the first driving method of the present invention, as in the case of the first driving device of the present invention described above, it is possible to realize a driving device for an electro-optical device that is stable against changes in response characteristics.

  In the first driving method of the present invention, various aspects similar to those of the above-described first driving device of the present invention can be employed.

  In order to solve the above-described problem, the second driving method of the electro-optical device according to the present invention provides a plurality of scanning lines and a plurality of data lines and a plurality of the scanning lines and a plurality of data that are wired so as to cross the image display area. An electro-optical device driving method for sub-field-driving an electro-optical device including a plurality of pixel units arranged so as to correspond to intersections of lines, wherein the plurality of scanning lines are connected via the plurality of scanning lines. Of these scanning lines, n (where n is a natural number of 2 or more) scanning lines are simultaneously transferred to scanning lines separated by k (where k is a natural number of 2 or more) of the plurality of scanning lines. A scanning signal supply step for supplying, and an image signal supply for supplying a plurality of subfield unit image signals in which one frame is divided on the time axis through the plurality of data lines in synchronization with the scanning signal Comprising the steps of The inspection signal supplying step is performed through the same scanning line of the plurality of scanning lines before and after the order of changing the scanning lines separated by k from the plurality of scanning lines. The scanning signal may be supplied.

  According to the second driving method of the present invention, as in the case of the above-described second driving device of the present invention, it is possible to realize a driving device for an electro-optical device that is stable against changes in response characteristics.

  In the second driving method of the present invention, various aspects similar to those of the first driving apparatus of the present invention described above can be adopted.

  In order to solve the above-described problems, the electro-optical device of the present invention includes the above-described first or second driving device (including various aspects thereof) of the electro-optical device of the present invention.

  According to the electro-optical device of the present invention, since the above-described first or second driving device of the present invention is provided, high-quality image display is possible without depending on the response characteristic change in each pixel unit. Become.

  In order to solve the above problems, an electronic apparatus according to the present invention includes the above-described electro-optical device of the present invention.

  According to the electronic apparatus according to the present invention, the liquid crystal device according to the present invention described above is included, so that a projection display device, a mobile phone, an electronic notebook, a word processor, a viewfinder type capable of high-quality display, or Various electronic devices such as a monitor direct-view video tape recorder, a workstation, a videophone, a POS terminal, and a touch panel can be realized. In addition, as an electronic apparatus according to the present invention, for example, an electrophoretic device such as electronic paper can be realized.

  The operation and other advantages of the present invention will become apparent from the best mode for carrying out the invention described below.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, the overall configuration of the electro-optical device driving device according to the first embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a schematic configuration of the image display apparatus 100 according to the first embodiment.

  In FIG. 1, the image display apparatus 100 mainly includes a controller 10, a scanning line driving circuit 11, a data line driving circuit 12, and a display panel 14. The image display device 100 is a device for acquiring the image signal D and displaying it. Specifically, the image display device 100 divides one field into a plurality of subfields on the time axis, and applies a turn-on voltage or a turn-off voltage to each pixel in each subfield in accordance with the gradation. The image is displayed based on the. That is, all pixels are sequentially written with one of binary voltages corresponding to ON or OFF within one subfield period, and this operation is repeatedly executed in all subfields constituting one field. The brightness of the field period is determined for each pixel. As described above, the image data signal Ds is supplied from the controller 10 as a digital signal having an on voltage or an off voltage corresponding to a gradation to be displayed for each pixel by a conversion circuit included in the controller 10 or the like.

  The controller 10 obtains the clock signal clk, the vertical scanning signal VS, the horizontal scanning signal HS, and the image signal D from the outside. The controller 10 generates a start pulse DY, a scanning transfer clock CLY, a data transfer clock CLX, an enable signal ENBX, and an image data signal Ds based on these acquired signals. The start pulse DY is a pulse signal output at the scanning start timing with respect to the scanning side (Y side). The scanning-side transfer clock CLY is a signal that defines vertical scanning on the scanning side (Y side). The enable signal ENBX is a pulse signal that determines the timing for starting data transfer to the data line driving circuit 12 and outputting the data for each scanning line to the pixel 14c. It is output in synchronization with the falling). The data transfer clock CLX is a signal that defines the timing for transferring data to the data line driving circuit 12. The image data signal Ds is a voltage signal corresponding to the image signal D, and is data indicating a high level or a low level for turning on or off the pixel 14c for each subfield period.

  The scanning line driving circuit 11 obtains the scanning signals G1, G2, G3,..., Gn to the scanning lines 14a of the display panel 14 by acquiring the start pulse DY and the scanning side transfer clock CLY from the controller 10. Output. In particular, in the present embodiment, the scanning line driving circuit 11 outputs a driving signal to two scanning lines separated by k out of the n scanning lines 14a. For example, when the start pulse DY is input, first, the scanning signals G1 and G1 + k are output, and the corresponding two scanning lines are driven. Subsequently, scanning signals G2 and G2 + k are output, and the corresponding two scanning lines are similarly driven. As described above, after the start pulse DY is input to the scanning line driving circuit 11, two scanning lines separated by k lines are sequentially driven in accordance with the scanning side transfer clock CLY.

  The data line driving circuit 12 acquires the enable signal ENBX, the data transfer clock CLX, and the data signal Ds from the controller 10, and the data signals d1, d2, d3,. dm is output. Specifically, the data line driving circuit 12 sequentially latches m image data signals Ds corresponding to the number of the data lines 14b in a certain horizontal scanning period, and then latches the m image data signals Ds to the next. In the horizontal scanning period, data signals d1, d2, d3,..., Dm are simultaneously supplied to the corresponding data lines 14b. In the present embodiment, the enable signal ENBX is set to a high level during the operation of the drive device, and a drive voltage is supplied to the pixel 14c according to the output value of the image data signal Ds. Further, as will be described later, the data signal dm may be supplied to each pixel portion 14c a plurality of times in one horizontal scanning period.

  The display panel 14 is configured by a liquid crystal (LCD) or the like, and is a display unit that displays an image signal or the like when a voltage is applied. Specifically, the display panel 14 includes a scanning line 14a, a data line 14b, and a pixel 14c. Specifically, the display panel 14 includes n scanning lines 14a ("n" is an even number) extending in the X (row) direction in the figure, and includes m pieces of data. The line 14b is formed extending along the Y (column) direction. The pixels 14c are provided corresponding to the intersections of the scanning lines 14a and the data lines 14b, and are arranged in a matrix.

  Next, a scanning line driving method will be specifically described with reference to FIG. FIG. 2 is a timing chart of the start pulse DY, the scanning side transfer clock CLY, and the scanning signal Gn output from the scanning line driving circuit 11. Here, the case where the scanning line driving circuit 11 outputs a driving signal simultaneously to two adjacent scanning lines (that is, the case where k = 1) is illustrated. FIG. 2 is a timing chart of the start pulse DY, the scanning side transfer clock CLY, and the scanning signal Gn output from the scanning line driving circuit.

  When the start pulse DY (see FIG. 2A) is input, supply of the scanning signal Gn is started in synchronization with the scanning side transfer clock CLY. First, the scanning signals G1 and G2 are output from the scanning line driving circuit 11, and the corresponding scanning lines are driven. Subsequently, scanning signals G2 and G3 are output. In this way, scanning signals are sequentially supplied to two adjacent scanning lines, and the two scanning lines are driven simultaneously.

  Next, input / output timing of each control signal in a state where the scanning line 14a is driven will be described with reference to FIG. FIG. 3 shows a scanning line side transfer clock CLY (FIG. 3A), an image data signal Ds (FIG. 3B) input to a pixel connected to the scanning line 14a corresponding to the scanning signal G1, and a scanning signal. The image data signal Ds (FIG. 3C) input to the pixels connected to the scanning line 14a corresponding to G2, and the image data signal Ds input to the pixels connected to the scanning line 14a corresponding to the scanning signal G3. (FIG. 3D) is a timing chart showing the image data signal Ds (FIG. 3E) input to the pixels connected to the scanning line 14a corresponding to the scanning signal G4. Here, the periods T1 to T3 are defined every ½ cycle of the scanning-side transfer clock CLY. The period Ti corresponds to the “i-th selection period” in the present invention. That is, in FIG. 3, the period T1 indicates the first selection period, the period T2 indicates the second selection period, and the period T3 indicates the third selection period.

  First, in the period T1, among the n scanning lines 14a, the scanning signals G1 and G2 are at a high level (see FIG. 2), so that the corresponding scanning lines are driven and the pixels are in a writable state. . Then, as shown in FIGS. 3B and 3C, two image data signals Ds are input to the pixels on the two scanning lines. Since the pixels on the two driven scanning lines share the data line 14b, the same signal is written to the pixels 14c on the same data line 14b. That is, as shown in FIGS. 3B and 3C, the same image data signal Ds is written to the pixels on the two scanning lines corresponding to the scanning signals G1 and G2 at the same timing.

  In the period T2, among the n scanning lines 14a, the scanning signals G2 and G3 are at the high level (see FIG. 2), so the corresponding two scanning lines 14a are driven. Since the pixels on the two scanning lines share the data line, the same signal is written to the pixels on the same data line 14b. As shown in FIGS. 3C and 3D, the same image data signal Ds is written to the pixels on the two scanning lines 14a corresponding to the scanning signals G2 and G3 at the same timing.

  In the period T3, among the n scanning lines 14a, the scanning signals G3 and G4 are at the high level (see FIG. 2), so the corresponding two scanning lines 14a are driven. Since the pixels on the two scanning lines share the data line, the same signal is written to the pixels on the same data line 14b. As shown in FIGS. 3C and 3D, the same image data signal Ds is written to the pixels on the two scanning lines 14a corresponding to the scanning signals G3 and G4 at the same timing.

  Here, FIG. 4 is a schematic diagram showing the input timing of the image data signal Ds (corresponding to FIG. 3C) written to the pixels on the scanning line corresponding to the scanning signal G2.

  In each of the periods T1 and T2, two image data signals Ds are input, and one field is divided into four subfields. Since each subfield period is defined by the writing timing of the image data signal Ds, the periods SF2 and Sf4 are longer than those of SF1 and SF3. In this way, by applying the image data signal Ds consisting of binary values of high / low levels in each subfield to the pixels, the pixels are driven in black / white inversion for each subfield.

  Here, FIG. 5 shows a subfield configuration in one frame in a case where a general driving method, that is, a driving method in which data is not written simultaneously to a plurality of scanning lines 14a is adopted. In such a driving method, since one data is written only to pixels along one scanning line, one frame is divided only into two subfields (SF1 and SF2 in FIG. 5). As a result, SF2 has a much longer time width than SF1. Thus, if one side of the subfield becomes extremely long, the contribution ratio of the short subfield to the image display becomes smaller than that of the long subfield, and pseudo contour noise is generated, so that the image quality is significantly lowered. In other words, since the bias of the subfield is large, when the density of the subfield is visually shifted from a high place to a low place, especially in the case of a moving image, a shift occurs in a pixel that is an integration target of a light receiving component in the eye. As a result, pseudo contour noise is generated as unintended linear noise.

  On the other hand, in the present embodiment, one frame is divided into SF1 to SF4 by writing the same image data signal Ds to pixels on adjacent scanning lines (see FIG. 4). In other words, by dividing SF2 in FIG. 5 into SF2 to SF4 in the present embodiment shown in FIG. 4, the subfields are dispersed so that they do not depend on a specific part. Thereby, generation | occurrence | production of pseudo contour noise can be prevented.

  In the present embodiment, the i-th selection period is further divided into a plurality of subfields by writing the image data signal Ds a plurality of times (two times in FIG. 4) during the i-th selection period. Thereby, the number of subfields can be increased by the writing timing of the image signal without increasing the scanning speed of the scanning line. Therefore, the number of subfields can be increased as the number of image data signals Ds in the i-th selection period is increased. As a result, for example, even in a line-sequential display device in which an image is displayed by sequentially driving a plurality of scanning lines, high-quality image display is possible by subfield driving with a large number of gradations.

  In particular, in the present embodiment, the image data signal Ds is continuously supplied twice during each of the periods T1 and T2. If the image data signal Ds is supplied in this way, the number of subfields can be increased very easily only by increasing the number of supplied image data signals Ds. Further, since the supplied image data signal Ds is continuously supplied and no extra signal or the like is inserted between them, the period of each subfield can be extremely shortened. As a result, as a result, the number of subfields in one field can be increased efficiently, and a display device driving apparatus with high image quality can be realized.

  In the present embodiment, since the same image signal is written to pixels on adjacent scanning lines, the resolution of the screen becomes rough. That is, in this aspect, since the same image data signal Ds is input to two adjacent pixels arranged along the data line, the two pixels substantially function as one pixel. Therefore, the resolution is substantially reduced to ½. However, if an image displays a subject that can be visually recognized by humans, such as a live-action image such as a landscape image, a human image, or an object image, or an animation image, the image is similar between adjacent pixels. Therefore, there is no direct reduction in image quality.

  Note that according to the driving method of the present embodiment, since data is written to a single scanning line a plurality of times, the frequency of the scanning line side transfer clock CLY may be smaller than that of general subfield driving. That is, even if the speed at which each scanning line is sequentially driven is slow, a plurality of subfields can be formed while one scanning line is being driven. If the data writing speed is high, it is possible to secure a sufficiently large number of subfields as a total. Therefore, the number of subfields can be increased without increasing the scanning speed for driving the scanning lines, and subfield driving rich in gradation expression can be realized. By increasing the number of subfields in this way, it is possible to compensate for a decrease in resolution caused by inputting the same image data signal Ds to pixels on adjacent scanning lines in order to suppress pseudo contour noise. . That is, even if the resolution is reduced to suppress pseudo contour noise, the deterioration in image quality can be compensated by the increase in the number of expression gradations due to the increase in the number of subfields.

As described above, according to the present embodiment, it is possible to realize a drive device for an electro-optical device with high gradation and rich image quality while suppressing pseudo contour noise.
[Second Embodiment]
The second embodiment is different from the first embodiment described above in that the writing timing of the image data signal Ds to the pixels defining the subfield can be arbitrarily controlled. This form is realized by the controller 10 arbitrarily adjusting the output timing of the image data signal Ds with respect to the data line driving circuit 12.

  FIG. 6 shows the scanning line side transfer clock CLY (FIG. 6A), the image data signal Ds (FIG. 6B) input to the pixels connected to the scanning line 14a corresponding to the scanning signal G1, and the scanning signal. An image data signal Ds (FIG. 6C) input to the pixels connected to the scanning line 14a corresponding to G2, and an image data signal Ds input to the pixels connected to the scanning line 14a corresponding to the scanning signal G3. (FIG. 6D) is a timing chart showing an image data signal Ds (FIG. 6E) input to the pixels connected to the scanning line 14a corresponding to the scanning signal G4.

In the present embodiment, the image data signal Ds is supplied twice for each scanning line in a one-field period, with the image data signal Ds being temporally discontinuous. That is, by adjusting the supply timing of the image data signal Ds by the scanning line driving circuit 11, the two image signals supplied to one scanning line among the plurality of image data signals Ds supplied to each pixel. There is an arbitrary waiting time between them. As a result, the period of each subfield is arbitrarily adjusted. As described above, according to the present embodiment, it is possible to define the subfield period while securing a higher degree of temporal freedom as compared with the first embodiment. As a result, by adjusting the time widths of SF1, SF2, and SF3, it becomes possible to distribute the subfields in a more balanced manner, so that it is possible to realize a drive device that is more suitable for preventing pseudo contour noise. it can.
[Third Embodiment]
FIG. 7 is a block diagram showing an electrical configuration of the drive device of the electro-optical device according to the present embodiment.

  The controller 10 obtains the clock signal clk, the vertical scanning signal VS, the horizontal scanning signal HS, and the image signal D from the outside, and transfers the start pulse DY, the scanning side transfer clock CLY, the enable signals ENBY1, ENBY2, and ENBX, and the data transfer. A clock CLX and a data signal Ds are generated. The enable signals ENBY1 and ENBY2 are data indicating a high level or a low level, and are used to select data to be output from the scanning line driving circuit 11 to the display panel 14. The enable signal ENBX is a pulse signal that determines the timing of starting data transfer to the data line driving circuit 12 and outputting data to the pixel 14c for each scanning line, and is a level transition (that is, rising edge) of the scanning side transfer clock CLY. And output in synchronization with the falling). The data transfer clock CLX is a signal that defines the timing for transferring data to the data line driving circuit 12. The data signal Ds is data corresponding to the image signal input to the controller 10, and is data indicating a high level or a low level for turning on or off the pixel 14c for each subfield period.

  The scanning line driving circuit 11 obtains a start pulse DY, a scanning side transfer clock CLY, and enable signals ENBY1 and ENBY2 from the controller 10, and scan signals G1, G2, and G3 for the scanning lines 14a of the display panel 14. , ..., Gn is output.

  The data line driving circuit 12 acquires the enable signal ENBX, the data transfer clock CLX, and the data signal Ds from the controller 10, and the data signals d1, d2, d3,. dm is output.

  Here, the configuration and operation of the scanning line driving circuit 11 will be described in detail with reference to FIGS.

  FIG. 8 is a diagram showing a schematic configuration of the scanning line driving circuit 11. The scanning line driving circuit 104 is configured to include a shift register 11aa and AND circuits 11b1 to 11bn. The shift register 11aa receives the scanning-side transfer clock pulse CLY and the start pulse DY, and drives the AND circuit 11bn at a predetermined timing in synchronization with the enable signals ENBY1 and ENBY2, thereby outputting the scanning signal Gn. The AND circuit 11bn (n = 1, 2, 5, 6... 11bn / 2 + 3, 11bn / 2 + 4... 11bn-3, 11bn-2) sets the enable signal ENBY1 to a high level, thereby shifting the shift register 11aa. When a predetermined high level voltage is output from the corresponding AND circuit 11bn, the corresponding scanning signal Gn is output. On the other hand, the AND circuit 11bn (n = 3, 4... 11bn / 2 + 1, 11bn / 2 + 2, 11bn / 2 + 5, 11bn / 2 + 6... 11bn-1, 11bn) sets the enable signal ENBY2 to a high level. When a predetermined high level voltage is output from the shift register 11aa, the corresponding scanning signal Gn is output from the corresponding AND circuit 11bn.

  9 shows (a) scan-side transfer clock pulse, (b) enable signal ENBY1, (c) enable signal ENBY2, and (d) scan signal Gn, (e) data transfer clock input to the shift register 11aa in FIG. 12 is a timing chart of CLX, (f) image data signal Ds.

  Here, the shift register 11aa is an AND circuit corresponding to two scanning lines separated from each other by four scanning signals Gn, G1, G5, G2, G6,. At the same time, a high level voltage signal is supplied. As shown in FIG. 8, the other terminal of the AND circuit separated by four in this way is connected to one of the enable signals ENBY1 and ENBY2. Therefore, by driving the two enable signals ENBY1 and ENBY2 on / off as shown in FIGS. 9B and 9C, G1 and G5, Gn / 2 + 1 and Gn / 2 + 5, G2 and G6, Gn / 2 + 2 and It is possible to set so that the scanning signal Gn is output in the order of Gn / 2 + 6. In particular, in the present embodiment, the waveforms of the enable signals ENBY1 and ENBY2 include waveforms that are continuously turned on or off so that the scanning signal Gn can be output in this order.

  On the other hand, the image data signal Ds synchronized with the data transfer clock CLX is applied to each pixel on the driven scanning line in synchronization with the timing at which the scanning signal is supplied to each scanning line. As a result, the image data signal Ds is written to each pixel and driven on / off.

  By supplying the scanning signal Gn to the two scanning lines separated in this way, it is possible to prevent the image data signal from temporally concentrating on a specific part of the image display region, so that the pseudo contour Generation of noise can be effectively suppressed. In the present embodiment, the same image signal is written to a plurality of pixels, so that the screen resolution becomes coarse. However, in general, among the hundreds of scanning lines, for example, pixels similar to each other are input to pixels existing on scanning lines separated by four as in the present embodiment. Therefore, there is no significant deterioration in image quality. Also, as will be described next, the resolution roughness can be compensated by increasing the number of subfields in one field.

  Next, FIG. 10 shows (a) a scanning-side transfer clock pulse input to the shift register 11aa of the driving device configured to supply a plurality of image data signals Ds while outputting a specific scanning signal. (B) Enable signal ENBY1, (c) Enable signal ENBY2, (d) Scan signal Gn, (e) Data transfer clock CLX, (f) Image data signal Ds.

  Compared to the case of FIG. 9, by increasing the frequency of the data transfer clock CLX, three image data signals Ds are supplied while driving a specific scanning line. As a result, it is possible to finely control the on / off driving of each pixel existing on the driven scanning line. That is, the number of subfields in one field can be significantly increased. As a result, it is possible to compensate for the resolution reduced by simultaneously supplying the scanning signal Gn to a plurality of scanning lines by increasing the number of gradations by increasing the number of subfields.

  In the mode shown in FIG. 10, if the timing for inputting the image data signal is arbitrarily adjusted by the control of the data line driving circuit 12, the subfield period is more time-similar to the second embodiment. It can be defined while ensuring the degree of freedom. As a result, it is possible to distribute the subfields in a balanced manner within one field, so that it is possible to realize a drive device that is more suitable for preventing pseudo contour noise.

  In particular, according to the present embodiment, since the number of subfields is defined by the number of times of writing the image data signal Ds, the number of subfields is increased by the writing timing of the image signal without increasing the scanning speed of the scanning line. It is possible to make it. Therefore, for example, even in a line sequential display device, high-quality image display can be performed by subfield driving with a large number of gradations.

  As described above, according to the present embodiment, it is possible to realize a high-quality electro-optical device driving device having excellent gradation expression capability while suppressing pseudo contour noise.

<Electro-optical device>
Next, an electro-optical device 500 to which the above-described driving device is applied will be described with reference to FIGS. In the following embodiments, a TFT (Thin Film Transistor) active matrix driving type liquid crystal device, which is an example of the electro-optical device of the present invention, is taken as an example.

  First, the configuration of the electro-optical panel in the electro-optical device according to the present embodiment will be described. FIG. 11 is a plan view showing the configuration of the electro-optical panel according to this embodiment, and FIG. 12 is a cross-sectional view taken along the line HH ′ of FIG.

  11 and 12, in the electro-optical panel 500 according to the present embodiment, the TFT array substrate 10 and the counter substrate 20 are disposed to face each other. The TFT array substrate 10 is, for example, a transparent substrate such as a quartz substrate or a glass substrate, a silicon substrate, or the like. The counter substrate 20 is a transparent substrate such as a quartz substrate or a glass substrate. A liquid crystal layer 50 is sealed between the TFT array substrate 10 and the counter substrate 20. The liquid crystal layer 50 is made of, for example, a liquid crystal in which one or several types of nematic liquid crystals are mixed, and takes a predetermined alignment state between the pair of alignment films. The TFT array substrate 10 and the counter substrate 20 are bonded to each other by a sealing material 52 provided in a sealing region located around the image display region 10a provided with a plurality of pixel electrodes.

  The sealing material 52 is made of, for example, an ultraviolet curable resin, a thermosetting resin, or the like for bonding the two substrates, and is applied on the TFT array substrate 10 in the manufacturing process and then cured by ultraviolet irradiation, heating, or the like. It is. In the sealing material 52, a gap material such as glass fiber or glass bead is dispersed for setting the distance between the TFT array substrate 10 and the counter substrate 20 (that is, the inter-substrate gap) to a predetermined value.

  A light-shielding frame light-shielding film 53 that defines the frame area of the image display area 10a is provided on the counter substrate 20 side in parallel with the inside of the seal area where the sealing material 52 is disposed. A part or all of the frame light shielding film 53 may be provided as a built-in light shielding film on the TFT array substrate 10 side.

  In the peripheral region, the data line driving circuit 12 and the external circuit connection terminal 102 are provided along one side of the TFT array substrate 10 in a region located outside the sealing region where the sealing material 52 is disposed. The scanning line driving circuit 11 is provided along two sides adjacent to the one side so as to be covered with the frame light shielding film 53. Further, in order to connect the two scanning line driving circuits 11 provided on both sides of the image display area 10a in this way, a plurality of the lines are covered along the remaining side of the TFT array substrate 10 and covered with the frame light shielding film 53. Wiring is provided.

  On the TFT array substrate 10, vertical conduction terminals 106 for connecting the two substrates with the vertical conduction material 107 are arranged in regions facing the four corner portions of the counter substrate 20. Accordingly, electrical conduction is established between the TFT array substrate 10 and the counter substrate 20.

  Subsequently, in FIG. 12, on the TFT array substrate 10, a stacked structure in which pixel switching TFTs as drive elements, wirings such as scanning lines and data lines are formed is formed. Although the detailed configuration of this laminated structure is not shown in FIG. 10, pixel electrodes 9a made of a transparent material such as ITO (Indium Tin Oxide) are provided on the laminated structure with a predetermined pattern for each pixel. It is formed in an island shape, and its surface is covered with an alignment film. The alignment film is in contact with the liquid crystal 50.

  The pixel electrode 9 a is formed in the image display area 10 a on the TFT array substrate 10 so as to face the counter electrode 21. On the surface of the TFT array substrate 10 facing the liquid crystal layer 50, that is, on the pixel electrode 9a, an alignment film 16 is formed so as to cover the pixel electrode 9a.

  A light shielding film 23 is formed on the surface of the counter substrate 20 facing the TFT array substrate 10. For example, the light shielding film 23 is formed in a lattice shape when viewed in plan on the facing surface of the facing substrate 20. In the counter substrate 20, a non-opening area is defined by the light shielding film 23, and an area partitioned by the light shielding film 23 is an opening area that transmits light emitted from, for example, a projector lamp or a direct viewing backlight. The light shielding film 23 may be formed in a stripe shape, and the non-opening region may be defined by the light shielding film 23 and various components such as data lines provided on the TFT array substrate 10 side.

  On the light shielding film 23, a counter electrode 21 made of a transparent material such as ITO is formed so as to face the plurality of pixel electrodes 9a. Further, in order to perform color display in the image display region 10a, a color filter (not shown in FIG. 10) may be formed on the light shielding film 23 in a region including a part of the opening region and the non-opening region. Good. An alignment film (not shown in FIG. 12) is formed on the counter electrode 21 on the counter surface of the counter substrate 20.

  11 and 12, on the TFT array substrate 10, in addition to the drive circuits such as the data line drive circuit 101 and the scanning line drive circuit 104, an image signal on the image signal line (that is, the data signal). ) For sampling and supplying the data line to the data line, a precharge circuit for supplying a precharge signal of a predetermined voltage level to the plurality of data lines in advance of the image signal, and the electro-optical device during manufacture or at the time of shipment. You may form the inspection circuit etc. for inspecting quality, a defect, etc.

  The liquid crystal composing the liquid crystal layer 50) modulates light and enables gradation display by changing the orientation and order of the molecular assembly according to the applied voltage level. In the normally white mode, the transmittance for incident light is reduced according to the voltage applied in units of each pixel, and in the normally black mode, the light is incident according to the voltage applied in units of each pixel. The transmittance for light is increased, and light having a contrast corresponding to an image signal is emitted from the electro-optical device as a whole.

In order to prevent the image signal held here from leaking, a storage capacitor 70 is added in parallel with the liquid crystal capacitor formed between the pixel electrode 9a and the counter electrode 21). The storage capacitor 70 is a capacitive element that functions as a storage capacitor that temporarily holds the potential of each pixel electrode 9a in response to supply of an image signal. One electrode of the storage capacitor 70 is connected to the drain of the TFT 30 in parallel with the pixel electrode 9a, and the other electrode is connected to the capacitor line 300 with a fixed potential so as to have a constant potential. According to the storage capacitor 70, the potential holding characteristic in the pixel electrode 9a is improved, and display characteristics such as contrast improvement and flicker reduction can be improved.
[Electronics]
Next, a specific example of an electronic apparatus to which the electro-optical device 500 according to the above-described embodiment can be applied will be described with reference to FIG.

  First, an example in which the electro-optical device 500 according to the above-described embodiment is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 13A is a perspective view showing the configuration of this personal computer. As shown in the figure, a personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the liquid crystal display device 100 according to the present invention is applied.

  Next, an example in which the electro-optical device 500 according to the above-described embodiment is applied to a display unit of a mobile phone will be described. FIG. 13B is a perspective view showing the configuration of this mobile phone. As shown in the figure, the cellular phone 720 includes a plurality of operation buttons 721, a reception port 722, a transmission port 723, and a display unit 724 to which the liquid crystal display device 100 according to the present invention is applied.

  Next, a projector using the electro-optical device 500 according to the above-described embodiment as a light valve will be described with reference to FIG.

  As shown in FIG. 14, a projector 1100 includes a lamp unit 1102 made up of a white light source such as a halogen lamp. The projection light emitted from the lamp unit 1102 is separated into three primary colors of RGB by four mirrors 1106 and two dichroic mirrors 1108 arranged in the light guide 1104, and serves as a light valve corresponding to each primary color. The light enters the liquid crystal panels 1110R, 1110B, and 1110G.

  The configurations of the liquid crystal panels 1110R, 1110B, and 1110G are the same as those of the liquid crystal device described above, and are driven by R, G, and B primary color signals supplied from the image signal processing circuit. The light modulated by these liquid crystal panels enters the dichroic prism 1112 from three directions. In the dichroic prism 1112, R and B light is refracted at 90 degrees, while G light travels straight. Therefore, as a result of the synthesis of the images of the respective colors, a color image is projected onto the screen or the like via the projection lens 1114.

  Here, paying attention to the display images by the liquid crystal panels 1110R, 1110B, and 1110G, the display image by the liquid crystal panel 1110G needs to be horizontally reversed with respect to the display images by the liquid crystal panels 1110R and 1110B.

  In addition, since light corresponding to each primary color of R, G, and B is incident on the liquid crystal panels 1110R, 1110B, and 1110G by the dichroic mirror 1108, it is not necessary to provide a color filter.

  In addition to the electronic device described with reference to FIG. 14, a mobile personal computer, a mobile phone, a liquid crystal television, a viewfinder type, a monitor direct-view type video tape recorder, a car navigation device, a pager, an electronic device Examples include a notebook, a calculator, a word processor, a workstation, a videophone, a POS terminal, and a device equipped with a touch panel. Needless to say, the present invention can be applied to these various electronic devices.

  In addition to the liquid crystal devices described in the above embodiments, the present invention includes a reflective liquid crystal device (LCOS), a plasma display (PDP), a field emission display (FED, SED), an organic EL display, and a digital micromirror device. (DMD), electrophoresis apparatus and the like are also applicable.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification. For electro-optical devices with such changes The substrate, the electro-optical device, and the electronic apparatus including the electro-optical device are also included in the technical scope of the present invention.

1 is a block diagram illustrating a schematic configuration of an image display device according to a first embodiment. FIG. 5 is a timing chart showing a start pulse, a scanning-side transfer clock, and a scanning signal in the first embodiment. 3 is a timing chart of a scanning side transfer clock and an image data signal in the first embodiment. 3 is a timing chart of a scanning side transfer clock and an image data signal in the first embodiment. 6 is a timing chart of a scanning-side transfer clock and an image data signal in a general driving device. 10 is a timing chart of a scanning side transfer clock and an image data signal in the second embodiment. It is a block diagram which shows schematic structure of the image display apparatus which concerns on 3rd Embodiment. It is a schematic diagram which shows schematic structure of the scanning line drive circuit which concerns on 3rd Embodiment. FIG. 10 is a timing chart showing a start pulse, a scanning side transfer clock, a scanning signal, a data transfer clock, and an image data signal in the third embodiment. FIG. 10 is a timing chart showing an example in which the data transfer clock and the image data signal are modified in FIG. 9. 1 is a plan view of an electro-optical device to which the present invention is applied. It is HH 'sectional drawing of FIG. It is an example of the electronic device to which this invention is applied. It is another example of the electronic device to which this invention is applied.

Explanation of symbols

10 controller 11 scan line drive circuit 11a shift register 11b
AND circuit, 12 data line driving circuit, 14 display panel, 14a scanning line,
14b data line, 14c pixel, 100 image display device, 500 electro-optical panel

Claims (17)

An electro-optical device including a plurality of scanning lines and a plurality of data lines wired in crossing with each other in an image display region, and a plurality of pixel portions arranged so as to correspond to intersections of the plurality of scanning lines and the plurality of data lines A driving device for an electro-optical device that performs sub-field driving,
Scanning signal supply means for simultaneously supplying a scanning signal to each of n (where n is a natural number of 2 or more) scanning lines among the plurality of scanning lines through the plurality of scanning lines;
The plurality of subfield unit image signals obtained by dividing one frame on the time axis through the plurality of data lines, and the scanning signal is the i-th (where i is a natural number) of the plurality of scanning lines. And an image signal supply means for supplying a plurality of times during the i-th selection period supplied via the scanning line.   2. The scanning signal supply unit supplies the scanning signal simultaneously to each of two scanning lines separated by m (where m is a natural number) as the n scanning lines. Electro-optical device drive device.   The image signal supply means supplies, as the image signal, an on voltage or an off voltage corresponding to a gradation to be displayed for each of the plurality of pixel portions for each of the plurality of subfields. Item 3. The driving device for an electro-optical device according to Item 1 or 2. The image signal supply means includes
For at least one subfield of the plurality of subfields, the image signal is supplied a plurality of times during the i-th selection period,
4. The image signal is supplied only once during the i-th selection period for other sub-fields excluding the at least one sub-field among the plurality of sub-fields. 5. The drive device for an electro-optical device according to any one of the above.   5. The electro-optical device driving device according to claim 1, wherein the image signal supply unit continuously supplies the image signal a plurality of times during the i-th selection period. .   5. The electro-optical device driving device according to claim 1, wherein the image signal supply unit supplies the image signal discontinuously a plurality of times during the i-th selection period. .   The electro-optical device driving apparatus according to claim 5, wherein the image signal supply unit supplies the image signal a plurality of times at equal intervals in the i-th selection period.   The electro-optical device drive according to claim 5, wherein the image signal supply unit supplies the image signal a plurality of times at unequal intervals in the i-th selection period or every arbitrary period. apparatus. The scanning signal supply unit alternately supplies the scanning signal to each of the n scanning lines alternately to scanning lines separated from each other by k (where k is a natural number of 2 or more) among the plurality of scanning lines. ,
9. The electro-optical device driving device according to claim 1, wherein the image signal supply unit supplies the image signal in synchronization with the scanning signal.   The scanning signal supply means passes through the same scanning line among the plurality of scanning lines before and after the order of changing the scanning lines separated by k from the plurality of scanning lines. The electro-optical device driving device according to claim 9, wherein the scanning signal is supplied. An electro-optical device including a plurality of scanning lines and a plurality of data lines wired in crossing with each other in an image display region, and a plurality of pixel portions arranged so as to correspond to intersections of the plurality of scanning lines and the plurality of data lines A driving device for an electro-optical device that performs sub-field driving,
Through the plurality of scanning lines, n (where n is a natural number greater than or equal to 2) scanning lines of the plurality of scanning lines are simultaneously transmitted to each other among the plurality of scanning lines k (where k Is a natural number greater than or equal to 2) scanning signal supply means for alternately supplying scanning lines apart from each other;
Image signal supply means for supplying a plurality of subfield unit image signals obtained by dividing one frame on the time axis through the plurality of data lines in synchronization with the scanning signal;
The scanning signal supply means passes through the same scanning line among the plurality of scanning lines before and after the order of changing the scanning lines separated by k from the plurality of scanning lines. The scanning signal may be supplied. A drive device for an electro-optical device. The scanning signal supply means is configured such that the order of changing the scanning lines separated by k from the plurality of scanning lines is once through the same scanning line among the plurality of scanning lines. The driving device for an electro-optical device according to claim 10, wherein a scanning signal may be supplied.   The image signal supply means supplies the image signal at equal intervals before and after the order of changing the scanning lines apart from each other among the plurality of scanning lines. The drive device for an electro-optical device according to claim 12. An electro-optical device including a plurality of scanning lines and a plurality of data lines wired in crossing with each other in an image display region, and a plurality of pixel portions arranged so as to correspond to intersections of the plurality of scanning lines and the plurality of data lines A driving method of an electro-optical device that performs sub-field driving,
A scanning signal supplying step of simultaneously supplying a scanning signal to each of n (where n is a natural number of 2 or more) scanning lines among the plurality of scanning lines through the plurality of scanning lines;
The plurality of subfield unit image signals obtained by dividing one frame on the time axis through the plurality of data lines, and the scanning signal is the i-th (where i is a natural number) of the plurality of scanning lines. And an image signal supply step of supplying the image signal a plurality of times during the i-th selection period supplied via the scanning line. An electro-optical device including a plurality of scanning lines and a plurality of data lines wired in crossing with each other in an image display region, and a plurality of pixel portions arranged so as to correspond to intersections of the plurality of scanning lines and the plurality of data lines A driving method of an electro-optical device that performs sub-field driving,
Through the plurality of scanning lines, n (where n is a natural number greater than or equal to 2) scanning lines of the plurality of scanning lines are simultaneously transmitted to each other among the plurality of scanning lines k (where k Is a natural number greater than or equal to 2) scanning signal supply step for alternately supplying scanning lines that are separated from each other;
An image signal supply step of supplying a plurality of subfield unit image signals obtained by dividing one frame on the time axis through the plurality of data lines in synchronization with the scanning signal;
In the scanning signal supply step, before and after the order of changing the scanning lines separated by k from the plurality of scanning lines is completed, the scanning signal supply step is performed via the same scanning line among the plurality of scanning lines. The method of driving an electro-optical device, characterized in that the scanning signal is supplied.   An electro-optical device comprising the electro-optical device driving device according to claim 1.   An electronic apparatus comprising the electro-optical device according to claim 16.

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