JP2000171774A - Electrooptical device and electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of block ghost normally generated in the frame portion of a screen. SOLUTION: A liquid crystal panel 100 is provided with switching elements such as TFTs 116 and pixel electrodes 118 at the crossing points of plural scanning lines 112 and plural data lines 114. Same number of dummy data lines 115a to 115f are provided on the left and the right sides of the region, where the lines 114 are provided. During a period in which the lines 112 are selected, a shift register 140 successively selects the lines 115a to 115f and blocks B1 to Bn, in each of which six lines 114 are made into a group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive circuit used for an active matrix type electro-optical device or the like. More specifically, when simultaneously sampling image signals from a plurality of image signal lines and writing the data signals to a plurality of data lines, an electro-optical device capable of preventing a ghost that may occur at both right and left ends of a screen and performing high-quality display, and The present invention relates to an electronic apparatus in which the electro-optical device is applied to a display unit.

[0002]

2. Description of the Related Art A conventional electro-optical device will be described by taking an active matrix type liquid crystal device as an example. FIG.
Reference numeral 0 is a block diagram showing a main configuration of the liquid crystal device. As shown in the figure, the liquid crystal device includes a plurality of scanning lines 112, a plurality of data lines 114, and each scanning line 11
2 and a thin film transistor (Thin Film Transistor: hereinafter, referred to as “TFT”) connected to each data line 114
And a pixel including a pixel electrode 118 connected to the TFT. Here, an operation of writing an image signal to a liquid crystal layer of each pixel via a plurality of TFTs 116 connected to one scanning line 112 is performed by dot sequential driving. Note that the TFT 116 is an example of a switching element, and is not limited to this. Each data line 114 is divided into blocks of six data lines.
Here, these are referred to as blocks B1 to Bn for convenience of description.

In such an active matrix type liquid crystal device, the sampling switches 131 provided for the respective data lines 114 are sequentially switched at a dot-sequential driving speed for the above-described dot-sequential driving, and image signals are transmitted. Need to sample. At this time, there occurs a problem that the switching characteristics of the sampling switch 131 cannot sufficiently follow the frequency of the input image signal. Generally, a driver circuit is replaced by a TFT which is a component of a pixel.
With a display device with a built-in driver that is built simultaneously with 116,
Since the driving capability of the thin film transistor as a sampling switch is lower than that of a display device using an external driver, the problem becomes more prominent. Further, even in a high-definition display device having a large number of pixels, the above problem becomes more remarkable because the frequency of the input image signal increases.

For this reason, a technique has been disclosed in which an image signal is converted into, for example, six serial-parallel signals, the data length per pixel is lengthened, and the signal frequency input to the liquid crystal device is lowered. 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 lengthened to increase the resolution. for that 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 simultaneously switched. By turning on the sampling switches 131 at a time, the image signals VID1 to VID6 subjected to serial-parallel conversion are simultaneously output to six data lines 114 corresponding to one block. With 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]

However, the image signals VID1 to VID1 are applied to every six data lines belonging to each block.
ID6 is sampled and these image signals VID1
In a configuration in which .about.VID6 is simultaneously written to six pixels of the scanning line selected at that time via the TFT 116, there is a problem that a so-called ghost occurs. These ghosts are 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 a ghost in which an image signal for a certain block appears in an adjacent block. A ghost caused by the

Among them, the former ghost can be eliminated to some extent by a configuration in which the output periods of the sampling signals S1 to Sn are exclusively output so as not to overlap each other.

On the other hand, the cause of the latter ghost (hereinafter referred to as a block ghost) is unknown, but when the sampling signal S5 is output to a certain block, for example, the block B5, the sampling signal is output. According to the output of S5, the adjacent sampling signals S4 and S6 (and possibly further blocks B3 and
2,... And the potential of the signal line supplying the blocks B7, B8,...), That is, the potential of the signal line coupled capacitively is increased. Is considered as one. As a result, the switch 131 belonging to the block B5 is turned on, and the switches 131 connected to the respective data lines 114 belonging to the adjacent blocks B4 and B6 are also likely to be turned on, so that the six data lines 114 belonging to the block B5 are turned on. Are written to the six data lines 114 belonging to the adjacent blocks B4 and B6, so that the image displayed by the pixel of the block B5 is written to the adjacent blocks B4 and B6. It will also appear in pixels.

Therefore, such a block ghost is inconspicuous when displaying a video image having a small density difference between pixels, but clearly appears when displaying a character having a large density difference between pixels. However, if the application of the liquid crystal device is to display a video image, the degree of the problem is relatively small because the character display is temporary.

However, in the liquid crystal device, the voltages of the image signals VID1 to VID6 correspond to black during a horizontal retrace period from the end of selection of a certain scanning line to the selection of the next scanning line. Since the voltage may be used, black display may be performed at the border of the screen. In this case, in the block adjacent to the border portion, a black image signal is superimposed and written in addition to the original image signal, and as a result, a black band-like block ghost always occurs at the border portion of the screen. , The extent of the problem is great.

The present invention has been made in view of the above-described circumstances, and provides an electro-optical device and an electronic apparatus capable of preventing a block ghost which always occurs at an edge portion of a screen and displaying a high quality image. It is intended to be.

[0011]

In order to achieve the above object, according to the present invention, there are provided a plurality of scanning lines, a plurality of data lines, a switching element connected to the scanning lines and the data lines, An electro-optical device having a pixel electrode connected to a switching element, a scanning line driving circuit for selecting the scanning line, and a plurality of dummy data lines arranged outside a region where the plurality of data lines are provided. A data line driving circuit for sequentially selecting the dummy data line and a block in which the data lines are grouped into a plurality of data lines during a period in which the scanning line is selected; and a plurality of data lines belonging to the selected block. Image signal supply means for supplying an image signal to the line.

According to this structure, the dummy data line and the block in which the data lines are grouped into a plurality of data lines are not completely selected, but are partially overlapped with each other. Even if a voltage corresponding to black is supplied to a part of the dummy data line, the effect of the voltage corresponding to black can be suppressed to a range where the dummy data line is provided. For this reason, a ghost that can always occur at the edge of the screen is prevented, and high-quality display is possible.

Here, it is preferable that the same number of dummy data lines are arranged at both ends of the region where the plurality of data lines are provided. As a result, the dummy data lines located at both ends are the same in both directions, so that even when the selection in the data line driving circuit corresponds to the bidirectional display of the left-right inverted image, The center of the effective image display area does not shift in either direction.

Further, in the present invention, in the data line driving circuit, it is preferable that a selection period of the dummy data line is shorter than a selection period of the block.
The selection of the dummy data line is a wasteful time that does not contribute to the image display, and therefore, the selection is performed quickly.

In addition, according to the present invention, a plurality of scanning lines, a plurality of data lines, a switching element connected to the scanning line and the data line, and a pixel electrode connected to the switching element are provided. An electro-optical device comprising: a scanning line driving circuit for sequentially selecting the scanning lines; a plurality of dummy data lines arranged outside an area where the plurality of data lines are provided; and a period during which the scanning lines are selected. A shift register circuit for sequentially selecting the dummy data line and a block in which the data lines are grouped into a plurality of data lines; and a plurality of data lines belonging to the selected block.
A sampling circuit for sampling and supplying an image signal.

According to this configuration, the dummy data line and the block in which the data lines are grouped into a plurality of lines are not completely selected, but are partially overlapped and selected. Even if a voltage corresponding to black is supplied to a part of the dummy data line, the effect of the voltage corresponding to black can be suppressed to a range where the dummy data line is provided. For this reason, a ghost that can always occur at the edge of the screen is prevented, and high-quality display is possible.

Further, an electronic apparatus according to the present invention is characterized in that the above-described electro-optical device is used for a display unit.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. In the embodiment, a liquid crystal device will be described as an example of the electro-optical device. FIG.
FIG. 1 is a diagram illustrating an overall configuration of a liquid crystal device of the present embodiment.

As shown in FIG. 1, 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 (to be described later as necessary) used in each unit. The conversion circuit 302 inside the image signal processing circuit 300
When an image signal VID of one system is input, the image signal is serial-parallel converted to an N-phase (N = 6 in the figure) image signal and output. Here, the reason why the image signal is serial-parallel-converted to N-phase is that, as described above, in the sampling circuit, the application time of the image signal to the source region of the TFT is extended, and the sample & hold time and the charge / discharge time are reduced. This is to secure enough.

On the other hand, the amplifying / inverting circuit 304 inverts the serial-parallel-converted image signal that needs to be inverted, and thereafter amplifies the image signal V as appropriate.
These are supplied to the liquid crystal panel 100 as ID1 to VID6. Whether or not to invert is determined depending on whether the application method of the data signal is a polarity inversion in scanning line units, a polarity inversion in data signal lines units, or a polarity inversion in pixel units. The inversion cycle is set to one horizontal scanning period or dot clock cycle. However, in this embodiment, for convenience of explanation, a case where the polarity is inverted in units of scanning lines will be described as an example, but the present invention is not limited to this. In this embodiment, the supply timings of the phase-developed image signals VID1 to VID6 to the liquid crystal panel 100 are the same, but they may be sequentially shifted in synchronization with the dot clock. And sequentially sample the N-phase image signals. The polarity inversion in the present embodiment means to alternately invert the voltage level between positive polarity and negative polarity based on a predetermined DC potential (the amplitude center potential of the image signal).

Next, the liquid crystal panel 100 will be described with reference to FIG. The liquid crystal panel 100 has a structure 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 switching elements are formed on a quartz substrate, hard glass, a silicon substrate, or the like.

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 scanning lines 112 are arranged in parallel in the Y direction intersecting with the scanning lines 112. The data lines 114 are formed, and each data line 114 is grouped into blocks B1 to Bn in units of six. In addition, three dummy data lines 115a, 115b, and 115c are provided on the left side of the block B1 located at the left end of each of the blocks B1 to Bn.
On the further right side of the block Bn located at the right end of each of the blocks B1 to Bn, three dummy data lines 115d, 115
e, 115f are provided.

As switching elements connected to the scanning lines 112 and the data lines 114, for example, TFT1
While 16 gate electrodes are connected to the scanning line 112, T
The source region of the FT 116 is connected to the data line 114 and the drain region of the TFT 116 is connected to the pixel electrode 11.
8 is connected. Each pixel has a pixel electrode 11
8, a common electrode formed on the opposing substrate, and a liquid crystal as an example of an electro-optical material sandwiched between these electrodes. As a result, at each intersection of the scanning line 112 and the data line 114, the matrix It will be arranged in a shape. In addition, a storage capacitor (not shown) is formed in a state connected to each pixel electrode 118.

The scanning line drive circuit 120 is composed of a plurality of stages of shift registers formed on an element substrate, and is based on a clock signal CLY from the timing circuit 200, its inverted clock signal CLYINV, a transfer start pulse DY, and the like. And outputs a pulse-like scanning signal to each scanning line 11.
2 is sequentially selected. More 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 in accordance with the clock signal CLY and its inverted clock signal CLYINV. The signal is output as a signal, whereby each scanning line 112 is sequentially selected.

On the other hand, the sampling circuit 130 includes dummy data lines 115a to 115c, data lines 114 belonging to the blocks B1 to Bn, and dummy data lines 115d to 115d.
15f, the sampling signals Sa to Sb, S1 to S
n, image signals VID1 to VID according to Sd to Sf
6 is sampled and supplied. Specifically, the sampling circuit 130 is connected to each data line 114
And a sampling switch 131 provided at one end of each of the dummy data lines 115a to 115f. Each switch 131 is connected to a TFT 116 constituting a pixel.
The source region of each switch 131 has image signals VID1 to VID6.
Is connected to a signal line to which one of the switches is supplied, and the drain region of each switch 131 is connected to one of the data lines 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 of the blocks B1 to Bn has a sampling signal S corresponding to the block.
1 to Sn are connected to any of the signal lines to which the signals are supplied. In addition, the dummy data line 115a located on the left side,
Each switch 13 connected to one end of 115b, 115c
1 gate electrodes are respectively connected to the sampling signals Sa and S
b, Sc are connected to the signal lines to be supplied, while the dummy data lines 115d, 115e, 115f located on the right side are connected.
The gate electrode of each switch 131 connected to one end of
Each is connected to a signal line to which the sampling signals Sd, Se, and Sf are supplied.

The shift register circuit 140 comprises a plurality of stages of shift registers formed on an element substrate, like the scanning line driving circuit 120, and includes a timing circuit 200.
From the clock signal CLX and its inverted clock signal C
Based on LXINV, transfer start pulse DX, etc., sampling signals Sa, Sb, Sc, S1, S2,.
Sd, Se, and Sf are sequentially output. Specifically, the shift register circuit 140 outputs the transfer start pulse DX supplied at the beginning of the horizontal scanning period to the clock signal CL.
The shift register sequentially shifts according to X and its inverted clock signal CLXINV. Thereby, for example, as shown in FIG. 3, the sampling signals Sa, Sb, Sc, S1, S2,.
d, Se, and Sf are sequentially output.

Next, the operation of the liquid crystal device according to this embodiment will be described. Here, first, as shown in FIG. 3, a description will be given on the assumption that the sampling signal Sa is output during the horizontal retrace period and the sampling signal Sb is output during the horizontal display effective period immediately after the end of the horizontal retrace period. I do. In this case, as shown in the figure, in the horizontal flyback period, the image signals VID1 to VID6 have a voltage corresponding to black. Therefore, during this horizontal scanning period,
When the sampling signal Sa is output, the switch 131 connected to the dummy data line 115a is turned on, so that the image signal VID4 having a voltage corresponding to black is applied to the dummy data line 115a. At this time, the sampling signal Sb is output by the output of the sampling signal Sa.
Is also increased by the capacitive coupling,
As a result, the switch 131 connected to the dummy data line 115b tends to be on, and the dummy data line 1
The voltage of 15b also approaches the image signal VID5 of the voltage corresponding to black at the present time. However, the dummy data line 1
Even if the voltage of 15b approaches the voltage corresponding to black, the dummy data line 115b does not appear as an actual display because no pixels are connected to the dummy data line 115b.
Also, the voltage of the dummy data line 115c is considerably low, but approaches the image signal VID6 of the voltage corresponding to black at the present time for the same reason, 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 during the horizontal flyback period, the occurrence of block ghost is suppressed at the left end of the display screen.

Even if the sampling signals Sb and Sc are output in sequence immediately after the end of the horizontal retrace period, dummy data is supplied as the image signals VID1 to VID6, so that the dummy data lines 115b and 115c
Since the pixels are not connected, they do not appear as actual displays.

Next, simultaneously with the output of the sampling signal S1, the image signals VID1 to VID to be actually displayed are displayed.
6 are supplied. For this reason, the image signals VID1 to VID1 are respectively applied to the six data lines 114 belonging to the block B1.
ID6 is sampled. Then, the sampled image signals VID <b> 1 to VID <b> 6 are respectively written into the six pixels on the currently selected scanning line by the TFT 116.

Thereafter, at the same time as the sampling signal S2 is output, the image signals VID1 to VI to be actually displayed are displayed.
D6 is supplied. Therefore, this time, the image signals V are respectively applied to the six data lines 114 belonging to the block B2.
ID1 to VID6 are sampled. Then, the sampled image signals VID1 to VID6 are written into the six pixels on the selected scanning line at that time by the TFT 116, respectively.

Similarly, the sampling signals S3,
When S4,..., Sn are sequentially output, block B3,.
The six data lines 114 belonging to B4,.
Each of the image signals VID1 to VID6 is sampled, and these image signals VID1 to VID6 are respectively written to six pixels on the selected scanning line at that time.

Incidentally, finally, the sampling signals Sd, S
e and Sf are output, the dummy data lines 115d, 1d
15e and 115f have image signals VID1 and VID, respectively.
Although dummy data is applied as ID2 and VID3, these dummy data lines 115d, 115e,
Since no pixel is connected to 115f, it does not appear as an actual display. Then, after that, the next scanning line is selected, and the same operation is repeatedly performed.

Next, as shown in FIG. 4, when the sampling signals Sa and Sb are output during the horizontal retrace period and the sampling signal Sc is output during the horizontal display effective period immediately after the end of the horizontal retrace period, Similarly, an 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 capacitive coupling.
The switch 131 connected to the switch c is turned on, and the voltage of the dummy data line 115c also approaches the image signal VID6 of the voltage corresponding to black at the present time. However, even if the voltage of the dummy data line 115c approaches the voltage corresponding to black, the dummy data lines 115b, 11b
Since no pixel is connected to 5c, it does not appear as an actual display. For this reason, even if the sampling signals Sa and Sb are output during the horizontal flyback period, the occurrence of block ghost is suppressed at the left end of the display screen.

On the other hand, as shown in FIG. 5, when the sampling signal Sd is output during the horizontal display effective period and the sampling signals Se and Sf are output during the horizontal retrace period for selecting the next scanning line, Since the switch 131 connected to the dummy data line 115e is turned on by the sampling signal Se, the image signal VID2 having a voltage corresponding to black is applied to the dummy data line 115e.
Is applied. 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 capacitive coupling, whereby the switch 131 connected to the dummy data line 115d is turned on, and the dummy The voltage of the data line 115d also approaches the image signal VID1 of the 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, the dummy data line 115d
Since no pixels are connected to d, 115e and 115f, they do not appear as actual displays. For this reason, even if the sampling signal Se is output during the horizontal retrace period for selecting the next scanning line, the occurrence of block ghost is suppressed at the right end of the display screen.

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 retrace period for selecting the next scanning line. , An 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 capacitive coupling, whereby 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 of the voltage corresponding to black at the present time. However, even if the voltage of the dummy data line 115e approaches the voltage corresponding to black, the dummy data lines 115e and 115f
Since the pixels are not connected, they do not appear as actual displays. For this reason, even if the sampling signal Sf is output during the horizontal flyback period for selecting the next scanning line, the occurrence of block ghost is suppressed at the right end of the display screen.

As described above, according to the present embodiment, the sampling signals Sa, Sb, Se or Sf are output, so that the adjacent sampling signals Sb and Sf are output.
Even if the voltage of the signal line supplying c, Sd, or Se is fluctuated by capacitive coupling, the effect is suppressed to the range where the dummy data line is provided, so that the block ghost generated at the left and right ends of the screen is prevented. Can be deterred.

In the embodiment, each data line 1
At the other end of the dummy data lines 115a to 115f, switches composed of TFTs formed by the same process as the TFTs 116 constituting the pixels are provided, and sampling signals Sa, Sb, Sc, S1 to Sn,
Before supplying Sd, Se, and Sf, the switch is turned on, and each data line 114 and dummy data line 115 are turned on.
a to 115f may be precharged to a predetermined potential. In such a configuration, if the polarity of the precharge and the polarity of the image signal applied immediately thereafter are the same, the amount of charge / discharge of the data line 114 by the image signals VID1 to VID6 itself is reduced.
The time required for writing by the TFT 116 is reduced.

Further, the shift register circuit 140 in the embodiment sequentially shifts the transfer start pulse DX from left to right in the figure to change the sampling signals Sa, S
b, Sc, S1 to Sn, Sd, Se, and Sf are output in this order. However, in the reverse direction, the transfer start pulse DX is sequentially shifted from right to left in the figure, and the sampling signal is output. To Sf, Se, Sd, Sn to S
Even if the output can be performed in the order of 1, Sc, Sb, and Sa, the occurrence of block ghost can be similarly suppressed. As described above, when the shift register circuit 140 has a configuration in which the transfer start pulse can be transferred bidirectionally, the number of dummy data lines provided on the left and right ends of each of the blocks B1 to Bn is 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 both directions, so that the shift register circuit 140 transfers the transfer start pulse DX from left to right to form an erect image. The center of the effective image display area is displaced in one of the left and right directions both when the image is displayed and when the shift register circuit 140 transfers the transfer start pulse DX from right to left to display a horizontally inverted image. Not even.

In the above-described embodiment, the number of dummy data lines provided at both ends of each of the blocks B1 to Bn is three on each of the left and right sides. However, the present invention is not limited to this. For example, the number may be two or four or more. When the number is large, the ghost is easily suppressed, but on the other hand, a large area that does not contribute to the display is required, and waste is generated by driving the dummy data lines.

In addition, the shift register 140 according to the above-described embodiment includes the dummy data lines 115a to 115f.
Are output with the same pulse widths and pitches as the sampling signals S1 to Sn for selecting the six data lines 114 belonging to each of the blocks B1 to Bn. Driving the dummy data lines 115a to 115f as described above is wasteful and does not contribute to the display. For example, as shown in FIG. 7, the pulse width of the sampling signals Sa to Sf is changed by changing the pulse width of the sampling signals S1 to Sn. It is desirable that the output pitch be shorter than the pulse width. Such a configuration includes, for example, a configuration that controls the cycle of the clock signal CLX and the inverted clock signal CLXINV, and also outputs, for example, the output of the shift register circuit 140 including a plurality of cascaded shift registers to the sampling signals Sa to Sf can be easily obtained by a configuration in which the sampling signal S1 is extracted for each stage and the sampling signals S1 to Sn are extracted for a plurality of stages.

Further, in the above description, each block is sequentially selected, and the image signals VID1 to VID6 which are serial-parallel converted into six phases are applied to the six data lines 114 belonging to one selected block. Are simultaneously sampled and supplied to the data lines. However, the number of serial-parallel conversion phase expansions and the number of data lines simultaneously sampled and supplied (ie, the number of data lines forming one block) are It is not limited to “6”. The number of serial-to-parallel conversion phases and the number of data lines to be sampled and supplied at the same time should be a multiple 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 control and circuits. Therefore, the number of data lines constituting one block is three, twelve, two,
Four,..., Etc. are simultaneously supplied to the data lines and are supplied in parallel with image signals that have been subjected to three-phase serial-parallel conversion development, twelve-phase serial-parallel conversion development, 24-phase serial-parallel conversion development, etc. May be configured.

<Electronic Equipment> Next, the above-described liquid crystal panel 1
Some examples in which 00 is used in electronic devices will be described.

<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.

As shown in FIG.
Inside 0, a lamp unit 1102 composed of a white light source such as a halogen lamp is provided. The projection light emitted from the lamp unit 1102 is
The light is separated into three primary colors of RGB by four mirrors 1106 and two dichroic mirrors 1108 arranged in the light 104, and is incident on liquid crystal panels 1110R, 1110B and 1110G as light valves corresponding to the respective primary colors.

The configurations of the liquid crystal panels 1110R, 1110B, and 1110G are the same as those of the above-described liquid crystal panel 100, 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 enters the dichroic prism 1112 from three directions. In the dichroic prism 1112, R and B
Is refracted at 90 degrees, while the G light goes straight. Therefore, as a result of combining the images of each color, the projection lens 11
A color image is projected on a screen or the like via the display 14.

Here, each of the liquid crystal panels 1110R, 111
Focusing on the display images by 0B and 1110G, the display image by the liquid crystal panel 1110G needs to be horizontally inverted with respect to the display image by the liquid crystal panels 1110R and 1110B. That is, the liquid crystal panel 1110
The selection direction of the dummy data line and the block in G needs to be opposite to the selection direction of the dummy data line and the block in the liquid crystal panels 1110R and 1110B.

The liquid crystal panels 1110R, 1110B
And 1110G have a dichroic mirror 1108
Accordingly, light corresponding to each of the primary colors of R, G, and B enters, so that it is not necessary to provide a color filter on the opposite substrate.

<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 120 having a keyboard 1202.
4 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.

Note that, 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, Word processors, workstations, mobile phones, video phones,
Examples include a POS terminal, a device equipped with a touch panel, and the like. It goes without saying that the present invention can be applied to these various electronic devices.

Further, the present invention has been described by taking an example in which a TFT is used as an active matrix type liquid crystal device. However, the present invention is not limited to this.
The present invention can be applied to a device using D (Thin Film Diode), a passive liquid crystal device using STN liquid crystal, and the like, and also to a case where a switching element is formed on a silicon substrate. Furthermore, it is not limited to a liquid crystal display device, and an electroluminescent element, etc.
The present invention can also be applied to a display device that performs display using various electro-optical effects.

[0051]

As described above, according to the present invention, it is not possible to completely select a dummy data line and a block in which a plurality of data lines are grouped, but to select a block partially overlapping. Even when a voltage corresponding to black is supplied to some of the plurality of dummy data lines, the effect of the voltage corresponding to black is suppressed to a range where the dummy data lines are provided. As a result, ghost that can always occur at the border of the screen is prevented, and as a result, high quality display is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating 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 illustrating an operation of a liquid crystal device according to an application of the present invention.

FIG. 8 is a cross-sectional view illustrating 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 illustrating 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 illustrating a main configuration of a conventional liquid crystal device.

[Explanation of symbols]

 100 liquid crystal 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 (5)

[Claims] A plurality of scanning lines, a plurality of data lines, a switching element connected to the scanning lines and the data lines,
An electro-optical device comprising: a pixel electrode connected to the switching element; a scan line driving circuit for selecting the scan line; and a plurality of dummy data lines arranged outside a region where the plurality of data lines are provided. And a data line driving circuit for sequentially selecting the dummy data lines and the blocks in which the data lines are grouped in a plurality during a period in which the scanning lines are selected; and a plurality of data lines belonging to the selected block. An electro-optical device comprising: an image signal supply unit that supplies an image signal to a data line. 2. The electro-optical device according to claim 1, wherein the same number of the dummy data lines are arranged at both ends of a region where the plurality of data lines are provided. 3. The electro-optical device according to claim 1, wherein in the data line driving circuit, a selection period of the dummy data line is shorter than a selection period of the block. 4. A plurality of scanning lines, a plurality of data lines, a switching element connected to the scanning lines and the data lines,
An electro-optical device comprising: a pixel electrode connected to the switching element; a scan line driving circuit for sequentially selecting the scan line; and a plurality of dummy data arranged outside an area provided with the plurality of data lines. A shift register circuit that sequentially selects the dummy data line and a block in which the plurality of data lines are grouped in a period in which the scanning line is selected; and a plurality of shift registers that belong to the selected block. An electro-optical device, comprising: a sampling circuit that samples an image signal and supplies the image signal to a data line. 5. An electronic apparatus using the electro-optical device according to claim 1 for a display unit.