JP2001242819A6 - Electro-optical device and electronic apparatus - Google Patents

Electro-optical device and electronic apparatus Download PDF

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Publication number
JP2001242819A6
JP2001242819A6 JP2000401604A JP2000401604A JP2001242819A6 JP 2001242819 A6 JP2001242819 A6 JP 2001242819A6 JP 2000401604 A JP2000401604 A JP 2000401604A JP 2000401604 A JP2000401604 A JP 2000401604A JP 2001242819 A6 JP2001242819 A6 JP 2001242819A6
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Prior art keywords
scanning line
circuit
pixel
signal
column
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JP2000401604A
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JP2001242819A (en
Inventor
良 石井
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セイコーエプソン株式会社
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Priority to JP1998255849 priority
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Priority to JP2000401604A priority patent/JP2001242819A/en
Priority claimed from JP2000401604A external-priority patent/JP2001242819A/en
Publication of JP2001242819A6 publication Critical patent/JP2001242819A6/en
Publication of JP2001242819A publication Critical patent/JP2001242819A/en
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Abstract

The present invention controls writing and holding of a data signal to a memory circuit in a pixel driving circuit according to selection or non-selection of a row scanning line and a column scanning line.
According to a data signal held in a memory circuit, a pixel driver conducts a first voltage signal line or a second voltage signal line to a pixel. A reference voltage is applied to the counter electrode of the counter substrate, and display is performed by a potential difference from the first voltage signal or the second voltage signal. This provides an electro-optical device with a simple control method and control circuit configuration that consumes less power than a conventional static drive type liquid crystal device.
[Selection] Figure 1

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electro-optical device in which a driving circuit including a memory circuit and a pixel driver is provided for each pixel, and the display of the pixel is controlled by a data signal held in the memory circuit, and further, an OA equipped with the electro-optical device. The present invention relates to electronic devices such as devices and portable devices.
[0002]
[Background]
In recent years, a liquid crystal device, which is an example of an electro-optical device, is particularly used as an information display device such as a mobile device such as a mobile phone or a mobile information terminal. Since the content of information to be displayed is about the character display, a dot matrix type liquid crystal panel is used to display a large amount of information at a time, and the number of pixels gradually increases and has become a high duty.
[0003]
Conventionally, a simple matrix type liquid crystal device has been used as a display device in the portable device as described above. However, in a simple matrix type liquid crystal device, a higher voltage as the scanning line selection signal becomes higher when performing multiplex driving. This is a major problem in portable devices that are driven by a battery that is strongly demanded to reduce power consumption as much as possible.
[0004]
In order to solve such a problem, one of a pair of substrates constituting the liquid crystal panel is a semiconductor substrate, and a memory circuit as shown in FIG. 12 is formed for each pixel on the semiconductor substrate, and display is performed based on data held in the memory circuit. A static drive type liquid crystal device that performs control has been proposed. The operation of the conventional static drive type liquid crystal device will be described below with reference to FIG.
[0005]
The scanning line driving circuit 410 is controlled by the scanning line driving circuit control signal 418, and a selection signal (scanning signal) is output to the selected scanning line 409-n (n is a natural number indicating the number of scanning lines). Similarly, the data line driving circuit 413 is controlled by the data line driving circuit control signal 419, and the selected data line pair 411-m, 412-m (m is a natural number indicating the number of data lines) are mutually opposite in phase ( A data signal is supplied so as to be a complementary signal.
[0006]
A circuit connected to each line forms a pixel at the intersection of the scanning line 409-n and the data line pair 411-m, 412-m. The n-channel MOS structure switching circuits 401 and 402 connected to the scanning line 409-n and the data line pair 411-m and 412-m are in a conductive state when the scanning line 409-n is selected and a selection signal is supplied. Thus, the complementary data signal of the data line pair 411-m, 412-m is written in the memory circuit 403. Here, the memory circuit 403 has a configuration in which two inverters are connected in a feedback manner. Next, when the scanning line 409-n is set to a non-selection potential and the data line pair 411-m, 412-m is set to high impedance, the switching circuits 401 and 402 are brought into a non-conduction state, and are written in the memory circuit 403. Holds the data signal.
[0007]
The liquid crystal pixel driver 404 composed of two transmission gate circuits is controlled by the potential level of the second node at the inverted level of the potential level of the first node in the memory circuit 403 and its connection point. The first transmission gate circuit is connected to the first voltage signal line 416 and becomes conductive in accordance with the level of the data signal held in the memory circuit 403, and applies the first voltage 414 to the pixel electrode 406. On the other hand, the second transmission gate circuit is connected to the second voltage signal line 417 and becomes conductive in accordance with the level of the data signal held in the memory circuit 403, and applies the second voltage 415 to the pixel electrode 406. . Specifically, the first voltage signal line 416 for turning on the liquid crystal layer 407 in the normally white display is turned on when the held data signal is H level, and the liquid crystal driver The first voltage 414 is supplied to the pixel electrode 406 via the first transmission gate circuit 404, and the liquid crystal pixel 405 enters the black display state due to the potential difference with the reference voltage 420 supplied to the counter electrode 408. Similarly, when the held data signal is at the L level, the second voltage signal line 417 for turning off the liquid crystal layer 407 is turned on, and the second voltage signal line 417 is turned on via the second transmission gate circuit of the liquid crystal driver 404. The voltage 415 is supplied and the liquid crystal pixel 405 enters a white display state.
[0008]
With this structure, when the power supply voltage, the first and second voltage signals, and the reference voltage can be driven only by the logic voltage, and the screen display does not need to be rewritten, the display state is maintained by the data holding function of the memory circuit. As a result, almost no current other than leakage current flows and power consumption can be reduced.
[0009]
[Problems to be solved by the invention]
However, in the conventional static drive type liquid crystal device, the data signals of the data line pair must be complementary signals of opposite phases when data is written, and must be controlled to high impedance when data is held. However, the circuit configuration is complicated.
[0010]
[Means for Solving the Problems]
SUMMARY An advantage of some aspects of the invention is that it provides an electro-optical device that consumes less power and has a simple control method and a simple control circuit configuration.
[0011]
The electro-optical device of the present invention includes a substrate, a plurality of row scanning lines and a plurality of column scanning lines that intersect with each other, a plurality of data lines disposed along the column scanning lines, and a voltage that supplies a voltage signal. A signal line and a plurality of pixel driving circuits arranged corresponding to the intersection of the row scanning line and the column scanning line, wherein each pixel driving circuit selects the row scanning line and the column scanning line. A switching circuit that is sometimes conductive and is non-conductive when at least one of the row scanning line and the column scanning line is not selected; and when the switching circuit is conductive, the data signal of the data line is captured and the switching A memory circuit that holds a data signal when the circuit is in a non-conductive state; and if the data signal held in the memory circuit is at a first level, the first voltage signal is output from the voltage signal line to a pixel; If two levels, characterized in that it comprises a pixel driver that outputs a second of said voltage signal from said voltage signal line to a pixel.
[0012]
According to the above configuration of the present invention, when the power supply voltage, the first and second voltage signals, and the reference voltage can be driven at about the logic voltage, and the screen display does not need to be rewritten, the display is performed by the data holding function of the memory circuit. Since the state can be maintained, almost no current flows. Accordingly, when compared with a liquid crystal device, power consumption is significantly reduced as compared with a conventional simple matrix liquid crystal device. Further, unlike the conventional static drive type liquid crystal device, it is not necessary to perform complicated control such that the data signal of the data line pair has an opposite phase when writing data and a high impedance when holding data, and the circuit configuration can be simplified. Have
[0013]
Further, in the electro-optical device according to the present invention, for each data line, a latch circuit that takes in a data signal to the corresponding data line when the column scanning line is selected and holds the data signal of the data line when not selected. It is characterized by having. According to this configuration, only the data line whose capacitance parasitic to the input data line is selected, the charge / discharge current accompanying the change in the signal of the input data line is greatly reduced, and the power consumption is greatly reduced. Have.
[0014]
Furthermore, in the electro-optical device according to the present invention, the pixel electrode disposed in the pixel is a light reflection type electrode, and the pixel driving circuit is disposed under the pixel electrode through an electrical insulating film. It is characterized by. According to this configuration, as compared with a static drive type liquid crystal device in which a TFT (Thin Film Transistor) is formed on a transparent substrate where the aperture ratio of the pixel is limited by the area of the pixel drive circuit occupying the area of one pixel. Thus, the aperture ratio is greatly improved, and a bright and easy-to-read screen can be obtained.
[0015]
Further, in the electro-optical device according to the present invention, when the row scanning line and the column scanning line are selected, a conduction control signal is displayed. When at least one of the row scanning line and the column scanning line is non-conductive, a non-conduction control signal is displayed. Are output to the switching circuit, and the switching control circuit controls the switching circuit in the plurality of pixel driving circuits. According to this configuration, the number of switching control circuits can be reduced, and the circuit configuration and control of the column scanning line driving circuit can be simplified. In addition, the writing operation for the entire screen can be completed in a short time, and power consumption can be reduced.
[0016]
Further, in the electro-optical device according to the present invention, a row scanning line driving circuit for supplying a row scanning signal to the row scanning line, and a column scanning line driving circuit for supplying a column scanning signal to the column scanning line. And at least one of the row scanning line driving circuit and the column scanning line driving circuit is constituted by a shift register circuit. This configuration has an effect that the circuit configuration and control of the scanning line driving circuit can be simplified.
[0017]
The electro-optical device according to the present invention further includes a row scanning line driving circuit for supplying a row scanning signal to the row scanning line, and a column scanning line driving circuit for supplying a column scanning signal to the column scanning line. And at least one of the row scanning line driving circuit and the column scanning line driving circuit is configured by a decoder circuit that selects an appropriate scanning line with an address signal having a number of bits corresponding to the number of scanning lines. Features. According to this configuration, when it is desired to rewrite only a part of the display on the screen, it is possible to rewrite the data signal by controlling the pixel driving circuit for only the target pixel, and the power consumption can be greatly reduced. Has an effect.
[0018]
Furthermore, the electro-optical device of the present invention is characterized in that the circuit element structure in the electro-optical device is a CMOS structure. According to this configuration, there is an effect that the leakage current during the data holding period is eliminated and the power consumption can be further reduced.
[0019]
An electronic apparatus according to the present invention includes the above-described electro-optical device according to the present invention. According to this configuration, when the battery is driven, it is possible to achieve a significantly longer life than an electronic device using a conventional simple matrix type liquid crystal device, and compared to a conventional static drive type liquid crystal device. There is an effect that a simple control method and control circuit configuration can be achieved.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
(First Embodiment) FIG. 1 is a block diagram showing the main parts of a pixel and its drive circuit in a liquid crystal device which is an electro-optical device according to a first embodiment of the present invention. FIG. 2 is a detailed circuit diagram of FIG.
[0022]
In FIG. 1, in the pixel region, row scanning lines 110-n (n is a natural number indicating the row scanning line) and column scanning lines 112-m (m is a natural number indicating the column scanning line) are arranged in a matrix. The driving circuit of each pixel is arranged at the intersection of the scanning lines. A column data line 115-d (d is a natural number indicating a column of column data lines) branched from the input data line 114 along the column scanning line 112-m is also arranged in the pixel region. A row scanning line driving circuit 111 is arranged in the peripheral region on the row side of the pixel region, and a column scanning line driving circuit 113 is arranged in the peripheral region on the column side of the pixel region.
[0023]
The row scanning line driving circuit 111 is controlled by the row scanning line driving circuit control signal 120, and a selection signal (scanning signal) is output to the selected row scanning line 110-n. A row scanning line that is not selected is set to a non-selection potential. Similarly, the column scanning line driving circuit 113 is controlled by the column scanning line driving circuit control signal 121, a selection signal is output to the selected column scanning line 112-m, and the non-selected column scanning lines are set to the non-selection potential. Is set. Which row scanning line and which column scanning line is selected is determined by the control signals 120 and 121. That is, the control signals 120 and 121 are address signals that specify the selected pixel.
[0024]
The switching control circuit 109 disposed in the vicinity of the intersection of the selected row scanning line 110-n and the selected column scanning line 112-m receives an on signal (conduction) in response to the selection signals of both scanning lines. Control signal), and when at least one of the row scanning line 110-n and the column scanning line 112-m is not selected, an off signal (non-conduction control signal) is output. That is, an on signal is output only from the switching control circuit 109 of the pixel located at the intersection of the selected row scanning line and column scanning line, and an off signal is output from the other switching control circuits. In the present embodiment, the liquid crystal pixel driving circuit 101 is controlled by an on / off signal of the switching control circuit 109.
[0025]
Next, the configuration and operation of the liquid crystal pixel drive circuit 101 will be described.
[0026]
The switching circuit 102 is turned on by an on signal from the switching control circuit 109 and is turned off by an off signal. When the switching circuit 102 becomes conductive, the data signal of the column data line 115-d connected thereto is written to the memory circuit 103 via the switching circuit 102. On the other hand, the switching circuit 102 is turned off by the off signal of the switching control circuit 109 and holds the data signal written in the memory circuit 103.
[0027]
The data signal held in the memory circuit 103 is supplied to the liquid crystal pixel driver 104 arranged for each pixel. The liquid crystal pixel driver 104 has a first voltage 116 supplied to the first voltage signal line 118 or a second voltage 117 supplied to the second voltage signal line 119 depending on the level of the supplied data signal. Is supplied to the pixel electrode 106 of the liquid crystal pixel 105. In the present invention, a pixel refers to an electro-optical material that electrically performs optical actions such as light modulation and light emission, or a pixel electrode for each pixel that provides an electrical action thereto. The first voltage 116 is a voltage for setting the liquid crystal pixel 105 in a black display state when the liquid crystal device is normally white display, while the second voltage 117 is a voltage for setting the liquid crystal pixel 105 in a white display state. .
[0028]
When the data signal held in the memory circuit 103 is at the H level, in the liquid crystal pixel driver 104, the gate connected to the first voltage signal line 118 for displaying the liquid crystal in black in the case of normally white display becomes conductive. The first voltage 116 is supplied to the pixel electrode 106, and the liquid crystal pixel 105 is in a black display state due to a potential difference from the reference voltage 122 supplied to the counter electrode 108. Similarly, when the held data signal is at the L level, the gate connected to the second voltage signal line 119 in the liquid crystal pixel driver 104 becomes conductive, and the second voltage 117 is supplied to the pixel electrode 106 and the liquid crystal. The pixel 105 is in a white display state.
[0029]
With the above configuration, the power supply voltage, the first and second voltage signals, and the reference voltage can be driven at about the logic voltage, and the display state can be held by the data holding function of the memory circuit when it is not necessary to rewrite the screen display. Almost no current flows. Further, since the writing to the pixel is controlled by the logic of the selection signal of the two scanning lines in the row and the column, the pixel can be controlled regardless of the potential of the data line. As described above, the data signals of the two data lines are set in the opposite phase (complementary data signal) when writing data, and the data line is set to high impedance so that the transistors connected to the data lines are made non-conductive when data is held. No complicated control is required.
[0030]
Note that the liquid crystal pixel 105 has a pixel electrode 106 to which one of the first voltage 116 and the second voltage 117 output from the liquid crystal pixel driver 104 is selected and supplied in accordance with the held data signal. A potential difference between both electrodes is applied to the liquid crystal layer 107 interposed between the pixel electrode 106 and the counter electrode 108, and a black display state (ON display) is applied according to the change in the orientation of the liquid crystal molecules corresponding to the potential difference. State) or white display state (also referred to as off display state). In the liquid crystal device, liquid crystal is sealed between a semiconductor substrate and a light-transmitting substrate such as glass, pixel electrodes are arranged in a matrix on the semiconductor substrate, and the liquid crystal pixel driving circuit is disposed below the pixel electrodes. A row scanning line, a column scanning line, a data line, a row scanning line driving circuit, a column scanning line driving circuit, and the like are formed. Since a complementary transistor having a high MOS structure mobility can be formed on the semiconductor substrate and a multilayer wiring structure can be easily formed, the above-described various circuits can be configured using the transistor and the multilayer wiring. Each pixel applies a voltage for each pixel between the pixel electrode 106 and the counter electrode 108 formed on the inner surface of the opposing light-transmitting substrate, and the voltage is applied to the liquid crystal layer 107 for each pixel interposed therebetween. Then, the orientation of liquid crystal molecules is changed for each pixel.
[0031]
At this time, the pixel electrode 106 of the liquid crystal pixel 105 is configured as a light-reflective electrode such as a metal or a dielectric multilayer film, and the liquid crystal pixel drive circuit 101 is disposed on the semiconductor substrate below the liquid crystal pixel electrode via an electrical insulating film. If it is set as the structure to arrange | position, an aperture ratio will improve significantly. That is, conventionally, each liquid crystal pixel drive circuit is configured using TFTs on a transparent substrate, and the aperture ratio of the liquid crystal pixel is determined by the area occupied by the liquid crystal pixel drive circuit that does not become a light transmission region in one pixel area. Compared to this, in the present invention, the pixel electrode and the liquid crystal pixel driving circuit have a laminated structure, and a reflective pixel electrode that is almost the entire area of one pixel can be disposed on the liquid crystal pixel driving circuit. The aperture ratio is greatly improved and a bright and easy-to-read screen is obtained.
[0032]
The column scanning line driving circuit 113 in FIG. 1 can be configured with a shift register circuit as shown in FIG. In FIG. 9, a column scanning line driving circuit control signal 121 composed of two signals of a positive logic (H level is active level) scanning signal 121-1 and a clock signal 121-2 is input and synchronized with the clock signal 121-2. Thus, the column scanning lines 112-m can be selected with negative logic (active level when at L level). That is, the clock signal 121-2 is used as a control signal for the shift register circuit together with the signal inverted by the inverter 113-6 having a CMOS transistor structure, and the scanning signal 121-1 is the first stage CMOS at the rising edge of the clock signal 121-2. It is taken in by the transistor-structured clocked inverter 113-1, inverted by the CMOS transistor-structured inverter 113-3, and at the fall of the clock signal 121-2, the two CMOS transistor-structured clocked inverters 113-2, 113- 4, the operation of feeding back the output and holding the scanning signal and the operation of transferring the scanning signal to the next stage are performed, and the scanning signal is sequentially transferred. The NAND gate circuit 113-5 having a CMOS transistor structure performs a logical product of the outputs of two adjacent stages and outputs a selection signal. The NAND gate circuit 113-5 is provided so that the output phases of the selection signals 112-m and 112-m + 1 do not overlap each other. According to this configuration, the scanning lines are sequentially selected.
[0033]
Similarly, if the row scanning line driving circuit 111 is formed of a shift register circuit similar to that in FIG. 9, the circuit configuration and control of the two scanning line driving circuits can be simplified. Further, the column scanning line driving circuit 113 can be constituted by a decoder circuit having the number of bits (AX0, / AX0, to AX7, / AX7) corresponding to the number of scanning lines as shown in FIG. The decoder circuit is configured to input a column scanning line driving circuit control signal 121 composed of an address signal, and the control signal 121 is decoded by a NAND gate circuit 113-7 having a CMOS transistor to select the corresponding column scanning line 112-m. The selection signal can be output. According to such a configuration, a selection signal can be output to an arbitrary scanning line in accordance with an address signal, and each pixel can be randomly accessed.
[0034]
Similarly, if the row scanning line driving circuit 111 is composed of a decoder circuit similar to that shown in FIG. 10, when it is desired to rewrite only a part of the screen, the data signal is rewritten by controlling the liquid crystal pixel driving circuit for only the target pixel. It becomes possible. In the present invention, each pixel is provided with a memory circuit 103 and holds the data signal written in the memory circuit 103 unless the switching circuit 102 is turned on by a row and column scanning line selection signal. Thus, only the pixel to be rewritten can be accessed and rewritten.
[0035]
As shown in FIG. 2, in this embodiment, the switching control circuit 109 can be configured by a logic circuit of a NOR gate circuit 109-1 having a CMOS transistor structure and an inverter 109-2 having a CMOS transistor structure. The NOR gate circuit 109-1 outputs a positive logic ON signal when a negative logic selection signal is input to both of the two inputs, and the inverter 109-2 outputs a negative logic ON signal. Further, the switching circuit 102 can be configured by a transmission gate 102-1 having a CMOS transistor configuration. The transmission gate 102-1 is turned on based on the ON signal of the switching control circuit 109, connects the column data line 115 and the memory circuit 103, and is turned off based on the OFF signal. The memory circuit 103 can have a configuration in which a clocked inverter 103-1 having a CMOS transistor configuration and an inverter 103-2 having a CMOS transistor configuration are feedback-connected. The data signal is taken into the memory circuit 103 from the switching circuit 102 by the ON signal of the switching control circuit 109, inverted by the inverter 103-2, and the output is fed back by the clocked inverter 103-1 operated by the OFF signal of the switching control circuit 109. The data signal is held. The liquid crystal pixel driver 104 can be constituted by transmission gates 104-1 and 104-2 having two CMOS transistors. When the data signal held in the memory circuit 103 is at the H level, the transmission gate 104-1 connected to the first voltage signal line 118 for displaying the liquid crystal in black in the normally white display is displayed in the liquid crystal pixel driver 104. The conduction state is established, the first voltage 116 is supplied to the pixel electrode 106, and the liquid crystal pixel 105 is in a black display state due to a potential difference from the reference voltage 122 supplied to the counter electrode 108. Similarly, when the held data signal is at the L level, the transmission gate 104-2 connected to the second voltage signal line 119 is in a conductive state, and the second voltage 117 is supplied to the pixel electrode 106 and the liquid crystal pixel. 105 is in a white display state.
[0036]
Furthermore, the overall configuration of the liquid crystal device configured as described above will be described with reference to FIGS. 13 is a plan view of the liquid crystal device substrate 10 as viewed from the side of the counter substrate 20 together with the components formed thereon, and FIG. 14 shows the H of FIG. 13 including the counter substrate 20. -H 'sectional drawing.
[0037]
In FIG. 13, a sealing material 52 is provided along the edge of the liquid crystal device substrate 10 made of, for example, a semiconductor substrate, and a non-pixel region is formed around the pixel region in parallel to the inside thereof. A surrounding light shielding film (frame) 53 is provided. A column scanning line driving circuit 113 and a mounting terminal 102 are provided along one side of the liquid crystal device substrate 10 in a region outside the sealing material 52, and a row scanning line driving circuit 111 is adjacent to this side. It is provided along the side. If the delay of the row scanning signal supplied to the row scanning line 110 is not a problem, the row scanning line driving circuit 111 may be provided on only one side. The counter substrate 20 is made of a transparent substrate such as glass, and at least one corner of the counter substrate 20 is electrically connected between the liquid crystal device substrate 10 and the counter substrate 20. The conductive material 106 is provided. The counter substrate 20 is fixed to the liquid crystal device substrate 10 by a sealing material 52. A liquid crystal 107 is sealed in a gap formed by the pair of substrates 10 and 20. As the liquid crystal 107, various liquid crystals such as a twisted nematic (TN) type, a vertical alignment type, a horizontal alignment type without twisting, a bistable type such as a ferroelectric type, and a polymer dispersion type can be used. In FIG. 14, reference numeral 106 denotes pixel electrodes arranged in a matrix in the pixel region on the liquid crystal device substrate 10, 22 denotes a black matrix formed on the counter substrate 20 (this may be omitted), and 108 denotes the counter electrode. It is a counter electrode made of ITO formed on the substrate 20. Note that the pixel electrode 106 and the counter electrode 108 may be disposed so as to face the liquid crystal device substrate 20, and a lateral electric field may be applied to the liquid crystal 107. Further, the liquid crystal device substrate 10 is not a semiconductor substrate, but a glass substrate is used, and a pixel driving circuit is configured based on a thin film transistor formed of a silicon layer formed on the substrate, so that the electro-optical device of the present invention is formed. You may comprise.
[0038]
In each of the following embodiments, the configuration of the liquid crystal device is the same as that shown in FIGS.
[0039]
(Second Embodiment) FIG. 3 is a block diagram showing the main parts of a pixel and its drive circuit in a liquid crystal device which is an electro-optical device according to a second embodiment of the present invention. FIG. It is a circuit diagram.
[0040]
As shown in FIG. 3, the present embodiment has a configuration in which a latch circuit 201 arranged at a point where the column data line 115 branches from the input data line 114 is added to the block diagram of FIG. 1 shown in the first embodiment. Become. Configurations not specifically described in the present embodiment are the same as those in the first embodiment.
[0041]
The latch circuit 201 takes in the data signal from the input data line 114 to the corresponding column data line 115-d when the column scanning line 112-m is selected, and holds the data signal of the column data line 115-d when not selected.
[0042]
With the above configuration, the parasitic capacitance of the input data line 114 can be limited to the capacitance of the column data line 115 connected to the selected latch circuit 201, and the power consumption can be greatly reduced.
[0043]
In this embodiment, as shown in FIG. 4, a latch circuit 201 is added to the circuit diagram of FIG. 2 shown in the first embodiment. The latch circuit 201 can be configured by a logic circuit of clocked inverters 201-1 and 201-2 having a CMOS transistor structure and an inverter 201-3 having a CMOS transistor structure. A selection signal for the column scanning line 112-m is used as a control signal for the latch circuit 201 together with a signal inverted by the inverter 202 having a CMOS transistor structure. The data signal input from the input data line 114 is taken in by the first clocked inverter 201-1 at the falling edge of the selection signal of the column scanning line 112-m, inverted by the inverter 201-3, and column scanning line 112-m. At the rising edge of the selection signal, the clocked inverter 201-2 performs an operation of feeding back the output and holding the data signal.
[0044]
(Third Embodiment) FIG. 5 is a block diagram showing the main parts of a pixel of a liquid crystal device which is an electro-optical device according to a third embodiment of the present invention and its drive circuit. FIG. 6 is a detailed circuit diagram thereof.
[0045]
As shown in FIG. 5, the present embodiment has a configuration in which the simultaneous input data signal is 2 bits. Configurations not specifically described in the present embodiment are the same as those in the first embodiment.
[0046]
In the pixel region, row scanning lines 110-n (n is a natural number indicating the row scanning line) and column scanning lines 112-m (m is a natural number indicating the column scanning line) are arranged in a matrix. A driving circuit for each pixel is formed at the intersection of the scanning lines. Further, in the pixel region, column data lines 115-d (d is a natural number indicating a column of column data lines) branched from two input data lines 114 corresponding to the number of simultaneous input data bits along the column scanning line 112-m. ) Is also arranged. A row scanning line driving circuit 111 is arranged in the peripheral region on the row side of the pixel region, and a column scanning line driving circuit 113 is arranged in the peripheral region on the column side of the pixel region.
[0047]
The row scanning line driving circuit 111 is controlled by the row scanning line driving circuit control signal 120, and a selection signal is output to the selected row scanning line 110-n. A row scanning line that is not selected is set to a non-selection potential. Similarly, the column scanning line driving circuit 113 is controlled by the column scanning line driving circuit control signal 121, a selection signal is output to the selected column scanning line 112-m, and the non-selected column scanning lines are set to the non-selection potential. Is set. Which row scanning line and which column scanning line is selected is determined by the control signals 120 and 121. That is, the control signals 120 and 121 are address signals that specify the selected pixel.
[0048]
The switching control circuit 109 arranged in the vicinity of the intersection of the selected row scanning line 110-n and the selected column scanning line 112-m receives the selection signal of both scanning lines and outputs an ON signal, and the row scanning line When at least one of 110-n and column scanning line 112-m is not selected, an off signal is output. That is, an on signal is output only from the switching control circuit 109 of the pixel located at the intersection of the selected row scanning line and column scanning line, and an off signal is output from the other switching control circuits. In the present embodiment, two liquid crystal pixel drive circuits 101 are controlled by an on / off signal of one switching control circuit 109.
[0049]
Next, the configuration and operation of the liquid crystal pixel drive circuit 101 will be described.
[0050]
The switching circuit 102 is turned on by an on signal from the switching control circuit 109 and is turned off by an off signal. When the switching circuit 102 becomes conductive, the data signal of the column data line 115-d connected thereto is written to the memory circuit 103 via the switching circuit 102. On the other hand, the switching circuit 102 is turned off by the off signal of the switching control circuit 109 and holds the data signal written in the memory circuit 103.
[0051]
The data signal held in the memory circuit 103 is supplied to the liquid crystal pixel driver 104 arranged for each pixel. The liquid crystal pixel driver 104 has a first voltage 116 supplied to the first voltage signal line 118 or a second voltage 117 supplied to the second voltage signal line 119 depending on the level of the supplied data signal. Is supplied to the pixel electrode 106 of the liquid crystal pixel 105. The first voltage 116 is a voltage for setting the liquid crystal pixel 105 in a black display state when the liquid crystal device is normally white display, while the second voltage 117 is a voltage for setting the liquid crystal pixel 105 in a white display state. .
[0052]
When the data signal held in the memory circuit 103 is at the H level, in the liquid crystal pixel driver 104, the gate connected to the first voltage signal line 118 for displaying the liquid crystal in black in the case of normally white display is turned on. The first voltage 116 is supplied to the pixel electrode 106, and the liquid crystal pixel 105 is in a black display state due to a potential difference from the reference voltage 122 supplied to the counter electrode 108. Similarly, when the held data signal is at the L level, the gate connected to the second voltage signal line 119 in the liquid crystal pixel driver 104 becomes conductive, and the second voltage 117 is supplied to the pixel electrode 106 and the liquid crystal. The pixel 105 is in a white display state.
[0053]
With the above configuration, the power supply voltage, the first and second voltage signals, and the reference voltage can be driven at about the logic voltage, and the display state can be held by the data holding function of the memory circuit when it is not necessary to rewrite the screen display. Almost no current flows. Further, since the writing to the pixel is controlled by the logic of the selection signal of the two scanning lines in the row and the column, the pixel can be controlled regardless of the potential of the data line. As described above, the data signals of the two data lines are set in the opposite phase (complementary data signal) when writing data, and the data line is set to high impedance so that the transistors connected to the data lines are made non-conductive when data is held. No complicated control is required. Further, since the two liquid crystal pixel driving circuits 101 are controlled simultaneously by one switching control circuit 109, the switching control circuit 109 can be reduced to half and the circuit configuration of the column scanning line driving circuit 113 can be simplified. can do.
[0054]
Note that the liquid crystal pixel 105 has a pixel electrode 106 to which one of the first voltage 116 and the second voltage 117 output from the liquid crystal pixel driver 104 is selected and supplied in accordance with the held data signal. A potential difference between both electrodes is applied to the liquid crystal layer 107 interposed between the pixel electrode 106 and the counter electrode 108, and a black display state (ON display) is applied according to the change in the orientation of the liquid crystal molecules corresponding to the potential difference. State) or white display state (also referred to as off display state). In the liquid crystal device, liquid crystal is sealed between a semiconductor substrate and a light-transmitting substrate such as glass, pixel electrodes are arranged in a matrix on the semiconductor substrate, and the liquid crystal pixel driving circuit is disposed below the pixel electrodes. A row scanning line, a column scanning line, a data line, a row scanning line driving circuit, a column scanning line driving circuit, and the like are formed. Since a complementary transistor having a high MOS structure mobility can be formed on the semiconductor substrate and a multilayer wiring structure can be easily formed, the above-described various circuits can be configured using the transistor and the multilayer wiring. Each pixel applies a voltage for each pixel between the pixel electrode 106 and the counter electrode 108 formed on the inner surface of the opposing light-transmitting substrate, and the voltage is applied to the liquid crystal layer 107 for each pixel interposed therebetween. Then, the orientation of liquid crystal molecules is changed for each pixel.
[0055]
At this time, the pixel electrode 106 of the liquid crystal pixel 105 is configured as a light-reflective electrode such as a metal or a dielectric multilayer film, and the liquid crystal pixel drive circuit 101 is disposed on the semiconductor substrate below the liquid crystal pixel electrode via an electrical insulating film. If it is set as the structure to arrange | position, an aperture ratio will improve significantly. That is, conventionally, each liquid crystal pixel drive circuit is configured using TFTs on a transparent substrate, and the aperture ratio of the liquid crystal pixel is determined by the area occupied by the liquid crystal pixel drive circuit that does not become a light transmission region in one pixel area. Compared to this, in the present invention, the pixel electrode and the liquid crystal pixel driving circuit have a laminated structure, and a reflective pixel electrode that is almost the entire area of one pixel can be disposed on the liquid crystal pixel driving circuit. The aperture ratio is greatly improved and a bright and easy-to-read screen is obtained.
[0056]
The column scanning line driving circuit 113 in FIG. 5 can be configured with a shift register circuit as shown in FIG. In FIG. 9, a column scanning line driving circuit control signal 121 composed of two signals of a positive logic (H level is active level) scanning signal 121-1 and a clock signal 121-2 is input and synchronized with the clock signal 121-2. Thus, the column scanning lines 112-m can be selected with negative logic (active level when at L level). That is, the clock signal 121-2 is used as a control signal for the shift register circuit together with the signal inverted by the inverter 113-6 having a CMOS transistor structure, and the scanning signal 121-1 is the first stage CMOS at the rising edge of the clock signal 121-2. It is taken in by the transistor-structured clocked inverter 113-1, inverted by the CMOS transistor-structured inverter 113-3, and at the fall of the clock signal 121-2, the two CMOS transistor-structured clocked inverters 113-2, 113- 4, the operation of feeding back the output and holding the scanning signal and the operation of transferring the scanning signal to the next stage are performed, and the scanning signal is sequentially transferred. The NAND gate circuit 113-5 having a CMOS transistor structure performs a logical product of the outputs of two adjacent stages and outputs a selection signal. The NAND gate circuit 113-5 is provided so that the output phases of the selection signals 112-m and 112-m + 1 do not overlap each other. According to this configuration, the scanning lines are sequentially selected.
[0057]
Similarly, if the row scanning line driving circuit 111 is formed of a shift register circuit similar to that in FIG. 9, the circuit configuration and control of the two scanning line driving circuits can be simplified.
[0058]
Further, the column scanning line driving circuit 113 can be constituted by a decoder circuit having the number of bits (AX0, / AX0, to AX7, / AX7) corresponding to the number of scanning lines as shown in FIG. The decoder circuit is configured to input a column scanning line driving circuit control signal 121 composed of an address signal, and the control signal 121 is decoded by a NAND gate circuit 113-7 having a CMOS transistor to select the corresponding column scanning line 112-m. The selection signal can be output. According to such a configuration, a selection signal can be output to an arbitrary scanning line in accordance with an address signal, and each pixel can be randomly accessed.
[0059]
Similarly, if the row scanning line driving circuit 111 is composed of a decoder circuit similar to that shown in FIG. 10, when it is desired to rewrite only a part of the screen, the data signal is rewritten by controlling the liquid crystal pixel driving circuit for only the target pixel. It becomes possible. In the present invention, each pixel is provided with a memory circuit 103 and holds the data signal written in the memory circuit 103 unless the switching circuit 102 is turned on by a row and column scanning line selection signal. Thus, only the pixel to be rewritten can be accessed and rewritten.
[0060]
As shown in FIG. 6, in this embodiment, the switching control circuit 109 can be constituted by a logic circuit of a NOR gate circuit 109-1 having a CMOS transistor structure and an inverter 109-2 having a CMOS transistor structure. The NOR gate circuit 109-1 outputs a positive logic ON signal when a negative logic selection signal is input to both of the two inputs, and the inverter 109-2 outputs a negative logic ON signal. Further, the switching circuit 102 can be configured by a transmission gate 102-1 having a CMOS transistor configuration. The transmission gate 102-1 is turned on based on the ON signal of the switching control circuit 109, connects the column data line 115 and the memory circuit 103, and is turned off based on the OFF signal. The memory circuit 103 can have a configuration in which a clocked inverter 103-1 having a CMOS transistor configuration and an inverter 103-2 having a CMOS transistor configuration are feedback-connected. The data signal is taken into the memory circuit 103 from the switching circuit 102 by the ON signal of the switching control circuit 109, inverted by the inverter 103-2, and the output is fed back by the clocked inverter 103-1 operated by the OFF signal of the switching control circuit 109. The data signal is held. The liquid crystal pixel driver 104 can be constituted by transmission gates 104-1 and 104-2 having two CMOS transistors. When the data signal held in the memory circuit 103 is at the H level, the transmission gate 104-1 connected to the first voltage signal line 118 for displaying the liquid crystal in black in the normally white display is displayed in the liquid crystal pixel driver 104. The conduction state is established, the first voltage 116 is supplied to the pixel electrode 106, and the liquid crystal pixel 105 is in a black display state due to a potential difference from the reference voltage 122 supplied to the counter electrode 108. Similarly, when the held data signal is at the L level, the transmission gate 104-2 connected to the second voltage signal line 119 is in a conductive state, and the second voltage 117 is supplied to the pixel electrode 106 and the liquid crystal pixel. 105 is in a white display state.
[0061]
In this embodiment, the simultaneous input data signal is 2 bits, but the present invention is not limited to this. For example, in order to simultaneously input data signals for three colors of RGB when performing color display, the simultaneous input data signal may be 3 bits.
[0062]
(Fourth Embodiment) FIG. 7 is a block diagram showing the main parts of a pixel and its drive circuit in a liquid crystal device which is an electro-optical device according to a fourth embodiment of the present invention. FIG. 8 is a detailed circuit diagram thereof.
[0063]
As shown in FIG. 7, the present embodiment is configured by adding a latch circuit 201 arranged at a point where the column data line 115 branches from the input data line 114 to the block diagram of FIG. 5 shown in the third embodiment. Become. The configuration not particularly described in the present embodiment is the same as that of the third embodiment.
[0064]
The latch circuit 201 takes in the data signal from the input data line 114 to the corresponding column data line 115-d when the column scanning line 112-m is selected, and holds the data signal of the column data line 115-d when not selected.
[0065]
With the above configuration, the parasitic capacitance of the input data line 114 can be limited to the capacitance of the column data line 115 connected to the selected latch circuit 201, and the power consumption can be greatly reduced.
[0066]
In this embodiment, as shown in FIG. 8, a latch circuit 201 is added to the circuit diagram of FIG. 6 shown in the third embodiment. The latch circuit 201 can be configured by a logic circuit of clocked inverters 201-1 and 201-2 having a CMOS transistor structure and an inverter 201-3 having a CMOS transistor structure. A selection signal for the column scanning line 112-m is used as a control signal for the latch circuit 201 together with a signal inverted by the inverter 202 having a CMOS transistor structure. The data signal input from the input data line 114 is taken in by the first clocked inverter 201-1 at the falling edge of the selection signal of the column scanning line 112-m, inverted by the inverter 201-3, and column scanning line 112-m. At the rising edge of the selection signal, the clocked inverter 201-2 performs an operation of feeding back the output and holding the data signal.
[0067]
In this embodiment, the simultaneous input data signal is 2 bits, but the present invention is not limited to this. For example, in order to simultaneously input data signals for three colors of RGB when performing color display, the simultaneous input data signal may be 3 bits.
[0068]
(Fifth Embodiment) FIG. 11 shows an example in which the electro-optical device according to the first to fourth embodiments of the present invention is used in a mobile phone. The liquid crystal device of the present invention was used as the display unit 301 of the mobile phone 302.
[0069]
With the above configuration, it is possible to realize a significantly longer life when compared with an electronic device using a conventional simple matrix type liquid crystal device when battery-operated, and easier than a conventional static drive type liquid crystal device. Control method and control circuit configuration.
[0070]
In this embodiment, a mobile phone is taken as an example, but the present invention is not limited to this. For example, the electro-optical device of the present invention can be applied to various electronic devices such as a clock, a pager, and a projector. In the case of a projector, the electro-optical device of the present invention is used as a light modulation device.
[0071]
The electro-optical device of 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 entire specification of the present application. The accompanying electro-optical device is also included in the technical scope of the present invention.
[0072]
For example, in each embodiment, the liquid crystal device has been described as the electro-optical device, but the present invention can also be applied to an electro-optical device in which a pixel is replaced with another electro-optical member instead of a liquid crystal pixel. As electro-optical devices other than liquid crystal devices, a digital micromirror device (DMD) or a plasma display panel (PDP) in which a mirror is arranged for each pixel and the angle of the mirror can be changed according to an image signal. , A field emission display (FED), electroluminescence (EL), or the like may be a self-luminous display device provided with a light emitting element in each pixel. However, in such an electro-optical device, there is a case where it is configured only by a single substrate on which a pixel circuit is formed, or there is a case where a glass substrate is used instead of a semiconductor substrate. Even if it exists, it is possible to apply this invention.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the main parts of a pixel and its drive circuit of an electro-optical device according to a first embodiment of the invention.
FIG. 2 is a circuit diagram in which the drive circuit of the electro-optical device according to the first embodiment of the present invention is configured with CMOS transistors.
FIG. 3 is a block diagram showing the main parts of a pixel and its drive circuit of an electro-optical device according to a second embodiment of the invention.
FIG. 4 is a circuit diagram in which a drive circuit of an electro-optical device according to a second embodiment of the present invention is configured with CMOS transistors.
FIG. 5 is a block diagram showing the main parts of a pixel and its drive circuit of an electro-optical device according to a third embodiment of the invention.
FIG. 6 is a circuit diagram in which a drive circuit of an electro-optical device according to a third embodiment of the present invention is configured with CMOS transistors.
FIG. 7 is a block diagram showing the main parts of a pixel and its drive circuit of an electro-optical device according to a fourth embodiment of the invention.
FIG. 8 is a circuit diagram in which a drive circuit of an electro-optical device according to a fourth embodiment of the present invention is configured with CMOS transistors.
FIG. 9 is a circuit diagram in which the scanning line driving circuit of the electro-optical device according to the first to fourth embodiments of the present invention is configured by a shift register circuit having a CMOS transistor configuration.
FIG. 10 is a circuit diagram in which the scanning line driving circuit of the electro-optical device according to the first to fourth embodiments of the present invention is configured by a decoder circuit having a CMOS transistor configuration.
FIG. 11 is a view showing an electronic apparatus based on a fifth embodiment of the present invention.
FIG. 12 shows a conventional static drive type liquid crystal device.
FIG. 13 is a plan view of a liquid crystal device.
14 is a cross-sectional view of the liquid crystal device of FIG.
[Explanation of symbols]
101 ... Liquid crystal pixel drive circuit
102... Switching circuit
103. Memory circuit
104 ... Liquid crystal pixel driver
105 ... Liquid crystal pixel
106 ... Pixel electrode
107 ... Liquid crystal layer
108 ... Counter electrode
109... Switching control circuit
110 ... row scanning line
111... Row scanning line driving circuit
112 ... Column scanning line
113 ... Column scanning line driving circuit
114 ... Input data line
115 ... column data line
116: first voltage
117 ... second voltage
118... First voltage signal line
119: Second voltage signal line
120... Control signal for row scanning line driving circuit
121... Control signal for column scanning line driving circuit
122 ... Reference voltage
201 ... Latch circuit
301 ... Display section
302 ... Mobile phone

Claims (8)

  1. A plurality of row scanning lines and a plurality of column scanning lines intersecting each other on the substrate, a plurality of data lines arranged along the column scanning lines, a voltage signal line for supplying a voltage signal, and the row scanning lines And a plurality of pixel driving circuits arranged corresponding to the intersections of the column scanning lines,
    Each pixel driving circuit includes:
    When the row scanning line and the column scanning line are selected, the switching circuit is turned on; when at least one of the row scanning line and the column scanning line is not selected, the switching circuit is turned on; and when the switching circuit is turned on A memory circuit that captures a data signal of the data line and holds the data signal when the switching circuit is in a non-conducting state; And a pixel driver that outputs the second voltage signal from the voltage signal line to the pixel in the case of the second level.
  2. 2. The latch circuit according to claim 1, further comprising a latch circuit that takes in a data signal to a corresponding data line when the column scanning line is selected and holds a data signal of the data line when the column scanning line is not selected. Electro-optic device.
  3. 3. The pixel electrode disposed in the pixel is a light reflection type electrode, and the pixel driving circuit is disposed under the pixel electrode through an electrical insulating film. The electro-optical device according to 1.
  4. A plurality of switching control circuits that output a conduction control signal to the switching circuit when at least one of the row scanning line and the column scanning line is non-conductive when the row scanning line and the column scanning line are selected. The electro-optical device according to claim 1, wherein the switching control circuit controls the switching circuits in the plurality of pixel driving circuits.
  5. A row scanning line driving circuit for supplying a row scanning signal to the row scanning line; and a column scanning line driving circuit for supplying a column scanning signal to the column scanning line, the row scanning line driving circuit and the column 5. The electro-optical device according to claim 1, wherein at least one of the scanning line driving circuits is configured by a shift register circuit.
  6. A row scanning line driving circuit for supplying a row scanning signal to the row scanning line; and a column scanning line driving circuit for supplying a column scanning signal to the column scanning line, the row scanning line driving circuit and the column 5. The scanning circuit according to claim 1, wherein at least one of the scanning line driving circuits includes a decoder circuit that selects an appropriate scanning line with an address signal having a number of bits corresponding to the number of scanning lines. The electro-optical device described.
  7. The electro-optical device according to claim 1, wherein a circuit element structure of the electro-optical device is a CMOS structure.
  8. An electronic apparatus comprising the electro-optical device according to claim 1.
JP2000401604A 2000-12-28 2000-12-28 Electrooptical device and electronics Withdrawn JP2001242819A (en)

Priority Applications (3)

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JP1998220737 1998-08-04
JP1998255849 1998-09-09
JP2000401604A JP2001242819A (en) 2000-12-28 2000-12-28 Electrooptical device and electronics

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US7081875B2 (en) 2000-09-18 2006-07-25 Sanyo Electric Co., Ltd. Display device and its driving method
JP5019668B2 (en) 2000-09-18 2012-09-05 三洋電機株式会社 Display device and control method thereof
TW594329B (en) 2000-09-18 2004-06-21 Sanyo Electric Co Active matrix type display device
TW507192B (en) 2000-09-18 2002-10-21 Sanyo Electric Co Display device
US7019727B2 (en) 2000-09-18 2006-03-28 Sanyo Electric Co., Ltd. Display device
EP1204089B1 (en) 2000-11-06 2006-04-26 SANYO ELECTRIC Co., Ltd. Active matrix display device with pixels comprising both analog and digital storage
JP3982992B2 (en) 2000-12-07 2007-09-26 三洋電機株式会社 Active matrix display device
TWI242085B (en) 2001-03-29 2005-10-21 Sanyo Electric Co Display device
JP4868652B2 (en) 2001-04-11 2012-02-01 三洋電機株式会社 Display device
JP2002372703A (en) 2001-04-11 2002-12-26 Sanyo Electric Co Ltd Display device
JP3883817B2 (en) 2001-04-11 2007-02-21 三洋電機株式会社 Display device
JP2002311901A (en) 2001-04-11 2002-10-25 Sanyo Electric Co Ltd Display device
JP4845281B2 (en) 2001-04-11 2011-12-28 三洋電機株式会社 display device
TWI236558B (en) 2001-04-13 2005-07-21 Sanyo Electric Co Active matrix type display device
JP4204204B2 (en) 2001-04-13 2009-01-07 三洋電機株式会社 Active matrix display device
US6956553B2 (en) 2001-04-27 2005-10-18 Sanyo Electric Co., Ltd. Active matrix display device
JP2008241832A (en) * 2007-03-26 2008-10-09 Seiko Epson Corp Liquid crystal device, pixel circuit, active matrix substrate, and electronic apparatus

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