JP3663943B2 - Electro-optical device and electronic apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a configuration of a drive circuit used in an active matrix type electro-optical device or the like. Specifically, when image signals from a plurality of image signal lines are simultaneously sampled and written to a plurality of data lines, an electro-optical device capable of preventing a ghost that can occur at both the left and right ends of the screen and displaying high quality, and The present invention relates to an electronic apparatus in which the electro-optical device is applied to a display unit.
[0002]
[Prior art]
A conventional electro-optical device will be described taking an active matrix type liquid crystal device as an example. FIG. 10 is a block diagram showing a main configuration of the liquid crystal device. As shown in this figure, the liquid crystal device includes a plurality of scanning lines 112, a plurality of data lines 114, and thin film transistors (hereinafter referred to as "TFTs") connected to the scanning lines 112 and the data lines 114. 116) and a pixel composed of a pixel electrode 118 connected to the TFT. Here, the operation of writing an image signal to the liquid crystal layer of each pixel is performed by dot sequential driving through a plurality of TFTs 116 connected to one scanning line 112. Note that the TFT 116 is an example of a switching element, and is not limited thereto. Each data line 114 is divided into blocks in units of six. Here, for convenience of description, these are referred to as blocks B1 to Bn.
[0003]
In such an active matrix liquid crystal device, it is necessary to sample the image signal by sequentially switching the sampling switch 131 provided for each data line 114 at the speed of the dot sequential drive for the above-described dot sequential drive. There is. At this time, there arises a problem that the switching characteristics of the sampling switch 131 cannot sufficiently follow the frequency of the input image signal. In general, in a display device with a built-in driver in which a driver circuit is formed at the same time as the TFT 116 as a constituent element of a pixel, the driving capability of a thin film transistor as a sampling switch is lower than that of a display device using an external driver. Become prominent. Even in a high-definition display device having a large number of pixels, the frequency of the input image signal becomes high, and thus the above problem becomes more prominent.
[0004]
For this reason, a technique for converting an image signal into, for example, six serial-parallel signals, increasing the data length per pixel, and lowering the signal frequency input to the liquid crystal device is disclosed. By this serial-parallel conversion, for example, even if the frequency characteristics of a thin film transistor as a sampling switch are not sufficient, the data length per pixel can be increased and the resolution can be increased. For this reason, as shown in FIG. 10, the data lines are divided into six blocks, and six sampling switches 131 corresponding to one block can be switched simultaneously. By simultaneously turning on the sampling switches 131 six by six, the serial-parallel converted image signals VID1 to VID6 are simultaneously output to six data lines 114 corresponding to one block. By adopting such a configuration, the sampling interval by the sampling switch 131 can be lengthened, and the thin film transistor can be easily used as the sampling switch.
[0005]
[Problems to be solved by the invention]
However, the image signals VID1 to VID6 are sampled for every six data lines belonging to each block, and these image signals VID1 to VID6 are passed through the TFT 116 to the six pixels of the scanning line selected at that time. In the configuration in which writing is performed simultaneously, there is a problem that a so-called ghost is generated. This ghost is roughly classified into two types. One is a ghost generated due to the waveform blunting of the image signals VID1 to VID6, and the other is an image signal to a certain block that appears in an adjacent block. It is a ghost generated by that.
[0006]
Among these, the former ghost can be eliminated to some extent by a configuration that outputs exclusively so that the output periods of the sampling signals S1 to Sn do not overlap each other.
[0007]
On the other hand, although the cause of the latter ghost (hereinafter referred to as block ghost) is unclear, when the sampling signal S5 is output to a certain block, for example, the block B5, the sampling signal S5 is output. Affects the potential of the signal lines that supply adjacent sampling signals S4, S6 (and in some cases blocks B3, B2,... And blocks B7, B8,...), That is, capacitively. One of the causes is considered to be raising the potential of the signal lines that are coupled. As a result, the switch 131 belonging to the block B5 is turned on, and the switches 131 connected to the data lines 114 belonging to the adjacent blocks B4 and B6 are also turned on, so that the six data lines 114 belonging to the block B5 are turned on. Since the image signals VID1 to VID6 that should be originally written in are also written to each of the six data lines 114 belonging to the adjacent blocks B4 and B6, the image displayed in the pixel of the block B5 is displayed in the adjacent blocks B4 and B6. It also appears in the pixel.
[0008]
Therefore, such a block ghost is not noticeable in the case of video image display with a small density difference between pixels, but appears clearly in a character display with a large density difference between pixels. However, if the application of the liquid crystal device is to display video images, the character display is temporary, so the degree of problem is relatively small.
[0009]
However, in the liquid crystal device, the voltage of the image signals VID1 to VID6 is set to a voltage corresponding to black in a horizontal blanking period from the end of selection of a certain scan line to the selection of the next scan line. In some cases, black display may be performed at the border of the screen. In this case, in the block adjacent to the border portion, in addition to the original image signal, the black image signal is also superimposed and written. As a result, a black belt-like block ghost always occurs in the border portion of the screen. The degree of problem is great.
[0010]
The present invention has been made in view of the circumstances described above, and an object thereof is to provide an electro-optical device and an electronic apparatus capable of preventing high-quality display by preventing a block ghost that can always occur at the edge of the screen. It is said.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a plurality of scanning lines, a plurality of data lines, and the scanning lines and data lines. Provided for the intersection of A switching element and the switching element Correspondingly provided An electro-optical device having a pixel electrode, a scanning line driving circuit for selecting the scanning line, and an area provided with the plurality of data lines of A plurality of dummy data lines arranged on the outside, the dummy data lines, and a data line driving circuit for sequentially selecting a block in which the plurality of data lines are grouped together; and In the effective horizontal display period An image signal is supplied to a plurality of data lines belonging to the selected block. In addition, dummy data is supplied to a dummy data line on a region side where the plurality of data lines are provided among the plurality of dummy data lines, and other dummy data lines among the plurality of dummy data lines are provided within a horizontal blanking period. Supply an image signal with a voltage equivalent to black to the dummy data line And an image signal supply means.
[0012]
According to this configuration, the selection of the dummy data lines and the block in which the data lines are grouped into a plurality of data lines is not completely performed, and a part of the dummy data lines are selected in an overlapping manner, and the plurality of dummy data lines are selected. Even when a voltage corresponding to black is supplied to a part of the line, the influence of the voltage corresponding to black can be suppressed to the range where the dummy data line is provided. For this reason, it is possible to prevent a ghost that can always be generated at the edge of the screen and to display a high quality image.
[0013]
Here, it is preferable that the same number of dummy data lines in the present invention are arranged at both ends of the region where the plurality of data lines are provided. Thereby, since the dummy data lines located at both ends are the same when viewed from any direction, even when the selection in the data line driving circuit displays a horizontally reversed image corresponding to the bidirectional direction, The center of the effective image display area does not shift in either the left or right direction.
[0014]
In the present invention, in the data line driving circuit, it is preferable that the selection period of the dummy data line is shorter than the selection period of the block. The selection of the dummy data line is a wasteful time that does not contribute to the image display, so that this selection can be done quickly.
[0015]
In addition, in the present invention, an electro-optical device having a plurality of scanning lines, a plurality of data lines, a switching element connected to the scanning lines and the data lines, and a pixel electrode connected to the switching element. In the apparatus, a scanning line driving circuit that sequentially selects the scanning lines, a plurality of dummy data lines arranged outside a region where the plurality of data lines are provided, and a period in which the scanning lines are selected, Image signals are sampled and supplied to a shift register circuit that sequentially selects a dummy data line and a block in which the data lines are grouped together, and a plurality of data lines belonging to the selected block. And a sampling circuit.
[0016]
According to this configuration, the selection of the dummy data lines and the block in which the data lines are grouped into a plurality of data lines is not completely performed, and a part of the dummy data lines are selected in an overlapping manner, and the plurality of dummy data lines are selected. Even when a voltage corresponding to black is supplied to a part of the line, the influence of the voltage corresponding to black can be suppressed to the range where the dummy data line is provided. For this reason, it is possible to prevent a ghost that can always be generated at the edge of the screen and to display a high quality image.
[0017]
Furthermore, an electronic apparatus according to the present invention is characterized in that the electro-optical device is used for a display unit.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment, a liquid crystal device will be described as an example of an electro-optical device. FIG. 1 is a diagram showing the overall configuration of the liquid crystal device of the present embodiment.
[0019]
As shown in this figure, the liquid crystal device includes a liquid crystal panel 100, a timing circuit 200, and an image signal processing circuit 300. Among these, the timing circuit 200 outputs a timing signal (described later if necessary) used in each unit. Further, the conversion circuit 302 in the image signal processing circuit 300 receives a single system image signal VID, converts it into an N-phase (N = 6 in the figure) image signal, and outputs it. is there. Here, the reason for serial-parallel conversion of the image signal to N phase is that, as described above, in the sampling circuit, the application time of the image signal to the TFT source region is lengthened, and the sample & hold time and charge / discharge time are reduced. This is to ensure enough.
[0020]
On the other hand, the amplifying / inverting circuit 304 inverts the serial-parallel converted image signal that needs to be inverted, and then amplifies it appropriately and supplies it to the liquid crystal panel 100 as the image signals VID1 to VID6. Is. Whether to invert the data signal is: (1) polarity inversion in units of scanning lines, (2) polarity inversion in units of data signal lines, or (3) polarity in units of pixels. The inversion period is set to one horizontal scanning period or a dot clock period. However, in this embodiment, for convenience of explanation, (1) the case of polarity reversal in units of scanning lines will be described as an example, but the present invention is not limited to this. Further, the supply timing of the phase-developed image signals VID1 to VID6 to the liquid crystal panel 100 is the same in the present embodiment, but may be sequentially shifted in synchronization with the dot clock. Thus, the N-phase image signal is sequentially sampled. Note that polarity reversal in the present embodiment refers to reversing the voltage level alternately between positive polarity and negative polarity based on a predetermined DC potential (amplitude center potential of an image signal).
[0021]
Next, the liquid crystal panel 100 will be described with reference to FIG. The liquid crystal panel 100 has a configuration in which an element substrate and a counter substrate face each other with a gap, and liquid crystal is sealed in the gap. Here, the element substrate is a substrate in which a switching element is formed on a quartz substrate, a hard glass, a silicon substrate, or the like.
[0022]
Among them, in the element substrate, a plurality of scanning lines 112 are arranged in parallel along the X direction in FIG. 2, and a plurality of data are paralleled along the Y direction intersecting therewith. A line 114 is formed, and each data line 114 is grouped into blocks B1 to Bn each having six units. In addition, three dummy data lines 115a, 115b, and 115c are provided on the left side of the block B1 positioned at the left end of each block B1 to Bn, while the block Bn positioned at the right end of each block B1 to Bn is further provided. Three dummy data lines 115d, 115e, and 115f are provided on the right side.
[0023]
As a switching element connected to the scanning line 112 and the data line 114, for example, the gate electrode of the TFT 116 is connected to the scanning line 112, while the source region of the TFT 116 is connected to the data line 114, and The drain region is connected to the pixel electrode 118. Each pixel includes a pixel electrode 118, a common electrode formed on the counter substrate, and a liquid crystal as an example of an electro-optical material sandwiched between the two electrodes. As a result, the scanning line 112 and the data line In each intersection with 114, it will arrange in a matrix form. In addition, a storage capacitor (not shown) is formed in a state of being connected to each pixel electrode 118.
[0024]
Now, the scanning line driving circuit 120 is composed of a plurality of stages of shift registers formed on the element substrate. Based on the clock signal CLY from the timing circuit 200, its inverted clock signal CLYINV, the transfer start pulse DY, etc. A scanning signal is output and each scanning line 112 is sequentially selected. Specifically, the scanning line driving circuit 120 sequentially shifts the transfer start pulse DY supplied at the beginning of the vertical scanning period by the shift register of each stage according to the clock signal CLY and its inverted clock signal CLYINV. As a signal, the scanning lines 112 are sequentially selected.
[0025]
On the other hand, the sampling circuit 130 applies the dummy data lines 115a to 115c, the data lines 114 belonging to the blocks B1 to Bn, and the dummy data lines 115d to 115f according to the sampling signals Sa to Sb, S1 to Sn, and Sd to Sf. The image signals VID1 to VID6 are sampled and supplied. Specifically, the sampling circuit 130 includes sampling switches 131 provided at one end of each data line 114 and dummy data lines 115a to 115f. Each switch 131 includes a TFT formed in the same process as the TFT 116 that constitutes a pixel, and the source region of each switch 131 is connected to a signal line to which any one of the image signals VID1 to VID6 is supplied. The drain region of each switch 131 is connected to each data line 114 or one of the dummy data lines 115a to 115f. Further, the gate electrode of each switch 131 connected to the data line 114 belonging to each block B1 to Bn is connected to one of the signal lines to which the sampling signals S1 to Sn are supplied corresponding to the block. In addition, the gate electrode of each switch 131 connected to one end of the dummy data lines 115a, 115b, and 115c located on the left side is connected to the signal line to which the sampling signals Sa, Sb, and Sc are supplied, respectively, while the right side The gate electrodes of the respective switches 131 connected to one ends of the dummy data lines 115d, 115e, and 115f located at are connected to signal lines to which sampling signals Sd, Se, and Sf are supplied, respectively.
[0026]
Similarly to the scanning line driving circuit 120, the shift register circuit 140 is composed of a plurality of stages of shift registers formed on the element substrate. The clock signal CLX from the timing circuit 200, its inverted clock signal CLXINV, and transfer start. Based on the pulse DX and the like, the sampling signals Sa, Sb, Sc, S1, S2,..., Sn, Sd, Se, Sf are sequentially output. In detail, the shift register circuit 140 sequentially shifts the transfer start pulse DX supplied at the beginning of the horizontal scanning period by the shift register of each stage according to the clock signal CLX and its inverted clock signal CLXINV. Thus, for example, as shown in FIG. 3, sampling signals Sa, Sb, Sc, S1, S2,..., Sn, Sd, Se, Sf are sequentially output.
[0027]
Next, the operation of the liquid crystal device according to the present embodiment will be described. Here, first, as shown in FIG. 3, it is assumed that the sampling signal Sa is output in the horizontal blanking period and the sampling signal Sb is output in the horizontal display effective period immediately after the end of the horizontal blanking period. To do. In this case, as shown in the figure, in the horizontal blanking period, the image signals VID1 to VID6 are voltages corresponding to black. Therefore, when the sampling signal Sa is output in this horizontal scanning period, the switch 131 connected to the dummy data line 115a is turned on, and therefore the image signal VID4 having a voltage corresponding to black is applied to the dummy data line 115a. Is applied. At this time, due to the output of the sampling signal Sa, the voltage of the signal line to which the sampling signal Sb is supplied also rises due to the capacitive coupling, whereby the switch 131 connected to the dummy data line 115b is turned on, and the dummy signal The voltage of the data line 115b also approaches the image signal VID5 having a voltage corresponding to black at the present time. However, even if the voltage of the dummy data line 115b approaches a voltage corresponding to black, since no pixel is connected to the dummy data line 115b, it does not appear as an actual display. Also, the voltage of the dummy data line 115c is considerably low, but for the same reason, it approaches the image signal VID6 having a voltage corresponding to black at the present time, but a pixel is connected to the dummy data line 115c. It does not appear as an actual display. For this reason, even if the sampling signal Sa is output in the horizontal blanking period, the occurrence of block ghost is suppressed at the left end of the display screen.
[0028]
Even if the sampling signals Sb and Sc are output in sequence immediately after the horizontal blanking period, dummy data is supplied as the image signals VID1 to VID6, and pixels are connected to the dummy data lines 115b and 115c. Since it has not been done, it does not appear as an actual display.
[0029]
Next, simultaneously with the output of the sampling signal S1, image signals VID1 to VID6 to be actually displayed are supplied. Therefore, the image signals VID1 to VID6 are sampled on the six data lines 114 belonging to the block B1, respectively. Then, the sampled image signals VID1 to VID6 are written into the six pixels in the currently selected scanning line by the TFT 116, respectively.
[0030]
Thereafter, simultaneously with the output of the sampling signal S2, the image signals VID1 to VID6 to be actually displayed are supplied. For this reason, the image signals VID1 to VID6 are sampled on the six data lines 114 belonging to the block B2 respectively. Then, the sampled image signals VID <b> 1 to VID <b> 6 are respectively written by the TFTs 116 into the six pixels on the selected scanning line at that time.
[0031]
Similarly, when the sampling signals S3, S4,..., Sn are sequentially output, the image signals VID1 to VID6 are sampled on the six data lines 114 belonging to the blocks B3, B4,. Then, these image signals VID1 to VID6 are respectively written in the six pixels on the selected scanning line at that time.
[0032]
When the sampling signals Sd, Se, and Sf are finally output, dummy data is applied to the dummy data lines 115d, 115e, and 115f as the image signals VID1, VID2, and VID3, respectively. Since the pixels are not connected to the dummy data lines 115d, 115e, and 115f, they do not appear as an actual display. Thereafter, the next scanning line is selected, and the same operation is repeatedly performed.
[0033]
Next, as shown in FIG. 4, when the sampling signals Sa and Sb are output in the horizontal blanking period and the sampling signal Sc is output in the horizontal display effective period immediately after the horizontal blanking period, the same applies. Thus, the image signal VID5 having a voltage corresponding to black is applied to the dummy data line 115b by the sampling signal Sb. At this time, due to the output of the sampling signal Sb, the voltage of the signal line to which the sampling signal Sc is supplied also rises due to the capacitive coupling, whereby the switch 131 connected to the dummy data line 115c is turned on, and the dummy The voltage of the data line 115c also approaches the image signal VID6 having a voltage corresponding to black at the present time. However, even if the voltage of the dummy data line 115c approaches a voltage corresponding to black, no pixel is connected to the dummy data lines 115b and 115c, so that it does not appear as an actual display. For this reason, even if the sampling signals Sa and Sb are output in the horizontal blanking period, the occurrence of block ghost is suppressed at the left end of the display screen.
[0034]
On the other hand, as shown in FIG. 5, when the sampling signal Sd is output in the horizontal display effective period and the sampling signals Se and Sf are output in the horizontal blanking period for selecting the next scanning line, the sampling signal Se. As a result, the switch 131 connected to the dummy data line 115e is turned on, and the image signal VID2 having a voltage corresponding to black is applied to the dummy data line 115e. At this time, due to the output of the sampling signal Se, the voltage of the signal line to which the sampling signal Sd is supplied also rises due to the capacitive coupling, whereby the switch 131 connected to the dummy data line 115d is turned on, and the dummy signal The voltage of the data line 115d also approaches the image signal VID1 having a voltage corresponding to black at the present time. However, even if the voltage of the dummy data line 115d approaches the voltage corresponding to black, no pixel is connected to the dummy data lines 115d, 115e, and 115f, so that it does not appear as an actual display. For this reason, even if the sampling signal Se is output during the horizontal blanking period for selecting the next scanning line, the occurrence of block ghost is suppressed at the right end of the display screen.
[0035]
Similarly, as shown in FIG. 6, when the sampling signals Sd and Se are output in the horizontal display effective period and the sampling signal Sf is output in the horizontal blanking period for selecting the next scanning line, The image signal VID3 having a voltage corresponding to black is applied to the dummy data line 115f by the sampling signal Sf. At this time, due to the output of the sampling signal Sf, the voltage of the signal line to which the sampling signal Se is supplied also rises due to the capacitive coupling, so that the switch 131 connected to the dummy data line 115e is turned on, and the dummy The voltage of the data line 115e also approaches the image signal VID2 having a voltage corresponding to black at the present time. However, even if the voltage of the dummy data line 115e approaches a voltage corresponding to black, no pixel is connected to the dummy data lines 115e and 115f, so that it does not appear as an actual display. For this reason, even if the sampling signal Sf is output in the horizontal blanking period for selecting the next scanning line, the occurrence of block ghost at the right end of the display screen is suppressed.
[0036]
As described above, according to this embodiment, when the sampling signal Sa, Sb, Se, or Sf is output, the voltage of the signal line that supplies the sampling signal Sb, Sc, Sd, or Se adjacent thereto is modulated by capacitive coupling. Even if it is performed, the influence is limited to the range in which the dummy data lines are provided, so that block ghosts generated at the left and right ends of the screen can be suppressed.
[0037]
In the embodiment, each of the data lines 114 and the dummy data lines 115a to 115f is provided with a switch made of a TFT made in the same process as the TFT 116 constituting the pixel, and the sampling signal Sa, Before supplying Sb, Sc, S1 to Sn, Sd, Se, and Sf, the switch may be turned on to precharge each data line 114 and dummy data lines 115a to 115f to a predetermined potential. . In such a configuration, if the polarity due to precharge and the polarity of the image signal applied immediately thereafter are the same polarity, the charge / discharge amount of the data line 114 by the image signals VID1 to VID6 itself is reduced, so that writing by the TFT 116 is performed. The time required for this will be shortened.
[0038]
Further, the shift register circuit 140 in the embodiment sequentially shifts the transfer start pulse DX from the left to the right in the drawing, and outputs the sampling signals in the order of Sa, Sb, Sc, S1 to Sn, Sd, Se, and Sf. However, in contrast to this, the transfer start pulse DX is sequentially shifted from the right to the left in the figure, and the sampling signals are called Sf, Se, Sd, Sn to S1, Sc, Sb, Sa. Even if it is possible to output in order, the occurrence of block ghost can be similarly suppressed. As described above, when the shift register circuit 140 is configured to be able to transfer the transfer start pulse bidirectionally, the number of dummy data lines provided at the left and right ends of each of the blocks B1 to Bn is set to be the same on the left and right. Is desirable. As a result, the dummy data lines located at both ends of each block are the same in any direction, and the shift register circuit 140 transfers the transfer start pulse DX from the left to the right so that an erect image is formed. Even in the case where the shift register circuit 140 transfers the transfer start pulse DX from the right to the left to display a horizontally reversed image, the center of the effective image display area is shifted in either the left or right direction. There is nothing.
[0039]
In the embodiment described above, the number of dummy data lines provided at both ends of each of the blocks B1 to Bn is three on the left and right, but the present invention is not limited to this. For example, the number may be two, or four or more. If the number is large, ghosts are easily suppressed correspondingly, but a large area that does not contribute to display is required, and waste is generated by driving those dummy data lines.
[0040]
In addition, the shift register 140 in the above-described embodiment uses the sampling signals Sa to Sf for selecting the dummy data lines 115a to 115f and the sampling for selecting the six data lines 114 belonging to the blocks B1 to Bn. Although the output is performed with the same pulse width and pitch as the signals S1 to Sn, driving the dummy data lines 115a to 115f as described above is useless that does not contribute to display. As described above, it is desirable that the pulse widths of the sampling signals Sa to Sf are shorter than the pulse widths of the sampling signals S1 to Sn and the output pitch is shortened. Such a configuration is, for example, a configuration for controlling the period of the clock signal CLX and the inverted clock signal CLXINV, or, for example, the output of the shift register circuit 140 composed of a shift register connected in a plurality of stages, and the sampling signal Sa˜ Sf can be easily obtained by taking out the sampling signals for each stage and sampling signals S1 to Sn for each of a plurality of stages.
[0041]
Further, in the above description, each block is selected sequentially, and the image signals VID1 to VID6 that have been subjected to serial-parallel conversion development in six phases are simultaneously sampled on the six data lines 114 belonging to the selected block. The number of serial-parallel conversion phase expansions and the number of data lines sampled and supplied simultaneously (that is, the number of data lines constituting one block) are “6”. It is not limited to. The number of serial-parallel conversion phase expansions and the number of data lines to be sampled and supplied simultaneously are multiples of 3 in view of the fact that a color image signal is composed of signals related to three primary colors. This is preferable for simplifying the control and the circuit. For this reason, the number of data lines constituting one block is set to 3, 12, 24,..., Etc., and three-phase serial-parallel conversion expansion or 12-phase serial-parallel conversion expansion is performed on the data lines. Alternatively, it may be configured to simultaneously supply image signals supplied in parallel after being developed by 24-phase serial-parallel conversion.
[0042]
<Electronic equipment>
Next, some examples in which the above-described liquid crystal panel 100 is used in an electronic device will be described.
[0043]
<Part 1: Projector>
First, a projector using this liquid crystal panel as a light valve will be described. FIG. 8 is a plan view showing a configuration example of the projector.
[0044]
As shown in the figure, a projector 1100 includes a lamp unit 1102 made 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.
[0045]
The configurations of the liquid crystal panels 1110R, 1110B, and 1110G are the same as those of the liquid crystal panel 100 described above, and are driven by R, G, and B primary color signals supplied from an image signal processing circuit (not shown). Now, the light modulated by these liquid crystal panels is incident on the dichroic prism 1112 from three directions. In this dichroic prism 1112, R and B light is refracted at 90 degrees, while G light travels straight. Accordingly, 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.
[0046]
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, 1110B. That is, the selection direction of the dummy data lines and blocks in the liquid crystal panel 1110G needs to be opposite to the selection direction of the dummy data lines and blocks in the liquid crystal panels 1110R and 1110B.
[0047]
Note that since light corresponding to the primary colors 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 on the counter substrate.
[0048]
<Part 2: Mobile computer>
Next, an example in which the liquid crystal panel is applied to a mobile computer will be described. FIG. 9 is a front view showing the configuration of the computer. In the figure, a computer 1200 includes a main body 1204 provided with a keyboard 1202 and a liquid crystal display 1206. The liquid crystal display 1206 is configured by adding a backlight to the back surface of the liquid crystal panel 100 described above.
[0049]
In addition to the electronic devices described with reference to FIGS. 8 and 9, a liquid crystal television, a viewfinder type, a monitor direct view type video tape recorder, a car navigation device, a pager, an electronic notebook, a calculator, a word processor, a work Stations, mobile phones, videophones, POS terminals, devices equipped with touch panels, and the like. Needless to say, the present invention is applicable to these various electronic devices.
[0050]
Furthermore, the present invention has been described with respect to an example in which a TFT is used as an active matrix liquid crystal device. However, the present invention is not limited to this, and a device using a TFD (Thin Film Diode) as a switching element or an STN liquid crystal can be used. The present invention can also be applied to the passive type liquid crystal device used, and can also be applied to the case where a switching element is formed on a silicon substrate. Furthermore, the present invention is not limited to a liquid crystal display device, and can be applied to a display device that performs display using various electro-optic effects such as an electroluminescence element.
[0051]
【The invention's effect】
As described above, according to the present invention, the selection of the dummy data line and the block in which the data lines are grouped for each of the plurality of data lines is not completely performed, and is selected in a partially overlapping manner, and Even when a voltage corresponding to black is supplied to some of the dummy data lines, the influence of the voltage corresponding to black is limited to the range where the dummy data lines are provided. As a result of preventing a ghost that can always occur in the portion, a high-quality display is possible.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an overall configuration of a liquid crystal device according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing an electrical configuration of a liquid crystal panel of the liquid crystal device.
FIG. 3 is a timing chart for explaining the operation of the liquid crystal device.
FIG. 4 is a timing chart for explaining the operation of the liquid crystal device.
FIG. 5 is a timing chart for explaining the operation of the liquid crystal device.
FIG. 6 is a timing chart for explaining the operation of the liquid crystal device.
FIG. 7 is a timing chart for explaining the operation of the liquid crystal device according to the application of the invention.
FIG. 8 is a cross-sectional view showing a configuration of a liquid crystal projector as an example of an electronic apparatus to which the liquid crystal device is applied.
FIG. 9 is a front view showing a configuration of a personal computer as an example of an electronic apparatus to which the liquid crystal device is applied.
FIG. 10 is a block diagram showing a main configuration of a conventional liquid crystal device.
[Explanation of symbols]
100 …… LCD panel
112 ... Scanning line
114 …… Data line
115a to 115f: Dummy data line
116 …… TFT
118 …… Pixel electrode
120... Scanning line driving circuit
130 …… Sampling circuit
140... Shift register circuit

Claims (4)

An electro-optical device having a plurality of scanning lines, a plurality of data lines, a switching element provided corresponding to the intersection of the scanning line and the data line , and a pixel electrode provided corresponding to the switching element. There,
A scanning line driving circuit for selecting the scanning line;
A plurality of dummy data lines arranged on the outside of the plurality of data lines are provided regions,
A data line driving circuit for sequentially selecting the dummy data lines and a block in which the data lines are grouped together;
In the effective horizontal display period, image signals are supplied to a plurality of data lines belonging to the selected block, and among the plurality of dummy data lines, dummy data lines on the region side where the plurality of data lines are provided Image signal supply means for supplying dummy data to the other dummy data line and supplying an image signal having a voltage equivalent to black to the other dummy data line in the horizontal blanking period. Electro-optical device characterized. The electro-optical device according to claim 1, wherein the same number of dummy data lines are arranged at both ends of an area where the plurality of data lines are provided. In the data line driving circuit,
The electro-optical device according to claim 1, wherein a selection period of the dummy data line is shorter than a selection period of the block. An electronic apparatus characterized by using a display unit an electro-optical device according to claim 1 to 3, wherein any one.

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