JPH08211407A - Liquid crystal display device and method for driving liquid crystal display device - Google Patents

Abstract

PURPOSE: To exactly display animation images with a liquid crystal display device of an active matrix type. CONSTITUTION: A central pixel electrode 101 and a peripheral pixel electrode 102 enclosing the central pixel electrode 101 are arranged in a pixel region. An electric field is first impressed on liquid crystals by the peripheral pixel electrode 102 to delay timing by the prescribed time and the electric field is impressed on the liquid crystals by the central pixel electrode 101. The delay in the action of the liquid crystals in the central part of the pixel region by the influence of the liquid crystals around the pixel region is eliminated and the liquid crystals of the pixel region are apparently and substantially simultaneously responded at a high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active matrix type liquid crystal display device and a driving method thereof.

[0002]

2. Description of the Related Art Conventionally, a CRT is most popular as a display device. However, since the CRT uses a vacuum glass tube and accelerates electrons with a high voltage, there are problems such as large volume, large weight, and large power consumption. Therefore, flat panel type display devices using plasma or liquid crystal have been developed. In particular, in recent years, among the liquid crystal display devices, active matrix liquid crystal display devices are becoming widespread.

FIG. 10 is a block diagram of a conventional active matrix type liquid crystal display device.
The signal line driving circuit 4 and the scanning line driving circuit 5 are connected by the signal line 2 and the scanning line 3.

FIG. 11 is a block diagram of a pixel matrix 1 of a conventional example, in which signal lines 11 to 13 and scanning lines 14 to 16 are arranged in a matrix on a glass substrate, and thin film transistors 17 to 20 are provided at intersections thereof. Are arranged. In the thin film transistors 17 to 20, the source electrode is connected to the signal lines 11 to 13 and the gate electrode is the scanning line 1
4 to 16 are connected. The drain electrode is connected to a pixel electrode (not shown) arranged corresponding to the liquid crystal cells 21 to 24 in the pixel region and the storage capacitors 25 to 28.

FIG. 12 is a glass diagram showing the time change of the potential applied to the electrodes of the thin film transistors 17 to 20,
12A shows the potential V _S applied to the source electrode of the thin film transistor, FIG. 12B shows the potential V _G applied to the gate electrode, and FIG. 12C shows the potential V _{D of the} drain electrode. Is.

In the case where the thin film transistors 17 to 20 are N-channel, when the gate electrode becomes high (the potential V _{G of the} gate electrode is on the positive side), the thin film transistors 17 to 20 are turned on and the potential V _{S of the} source electrode and the potential of the drain electrode. V
_D works to be equal. By this operation, the potentials of the signal lines 11 to 13 are written in the holding capacitors 25 to 28. Next, when the gate electrodes of the thin film transistors 17 to 20 become low (the negative side potential of the gate electrodes), the thin film transistors 17 to 20 are turned off and the source electrode and the drain electrode are opened. As a result, the potentials of the storage capacitors 25-28 are next increased by the thin film transistors 17-20.
Is turned on and held until another write occurs. Also, FIG. 1 sandwiched between the counter electrode and the pixel electrode.
The liquid crystal cells 21 to 24 of No. 1 are applied with a voltage difference between both electrodes, and the polarization characteristics of light change according to the voltage. Then, through the polarizing plate, the transmittance finally changes, and light and dark are formed.

That is, the liquid crystal display device utilizes the fact that the dielectric constant of the liquid crystal substance is different between the direction parallel to the molecular axis and the direction perpendicular to the molecular axis to control the polarization of light, the amount of transmitted light, and the amount of scattering. ON / OFF is controlled to display light and dark. As the liquid crystal material, TN liquid crystal, STN liquid crystal, ferroelectric liquid crystal, etc. are generally used.

Further, as a method for manufacturing a peripheral driving circuit for driving a pixel, a method for manufacturing with a transistor integrated circuit of single crystal silicon and a method for manufacturing with a thin film transistor using polysilicon are formed on the same glass substrate as the active matrix. There is a method of integrally manufacturing. A drive circuit made of single crystal silicon is usually connected to an active matrix in the form of TAB or COG. On the other hand, in the method of manufacturing with a polysilicon thin film transistor, the driving circuit is connected to the active matrix not by TAB or COG but by metal wiring on the substrate.

[0009]

In the conventional active matrix type liquid crystal display device, a TN liquid crystal is mainly used as a liquid crystal material because of its low price and easy alignment control. The TN liquid crystal has a transmittance-applied voltage (V) characteristic as shown in FIG. As shown in FIG. 13, since the transmittance-applied voltage (V) characteristic has a relatively gentle curve, the liquid crystal display device using the TN liquid crystal can display a gray scale depending on the applied voltage.

However, the TN liquid crystal has a problem that the response to the applied voltage is slow. Generally, in a liquid crystal display device using a TN liquid crystal, a response delay of 10 msec to several tens msec occurs when the gradation changes from black to white as shown in FIG. 14 or vice versa. To do. Especially when focusing on one display pixel,
It is observed that when the gradation changes from black to white, the gradation at the center of the pixel first changes, and after that, the gradation at the periphery of the display pixel changes. This delay in response is due to the phenomenon that the response time when an electric field is applied differs between the peripheral portion and the central portion of the liquid crystal in the pixel region.

The above phenomenon will be described with reference to FIGS. 15 (a) and 15 (b). 15A is a schematic diagram of liquid crystal molecules in a liquid crystal cell in a state where a voltage is applied to the pixel electrode, and FIG. 15B is a schematic diagram of lines of electric force between the pixel electrodes of the liquid crystal cell. As shown in FIG. 15A, in the liquid crystal cell, liquid crystal molecules 33 are sandwiched between a pair of glass substrates 31 and 32, and the glass substrates 31 and 32 have a pair of transparent pixel electrodes 3.
4, 35 are provided facing each other. Further, an alignment film and a thin film transistor for switching are provided in addition to the constituent elements shown in the drawing, but the description thereof is omitted in FIG. Further, by sandwiching the configuration shown in FIG. 15A with a pair of deflection plates, a liquid crystal display device having the most basic configuration can be obtained.

As shown in FIG. 15A, when an electric field is applied to the liquid crystal molecules 33 by the pair of pixel electrodes 34 and 35, the liquid crystal molecules 33 are moved along the lines of electric force 36 shown in FIG. 15B. The molecular axes of are aligned in a uniform direction. As a result, the polarization state of the light transmitted through the liquid crystal molecules 33 changes.

However, in the peripheral portions of the pixel electrodes 34 and 35, the liquid crystal molecules 33 on the right side, that is, from the center rotate with the boundary surface 37 as a boundary, while the liquid crystal molecules 33 on the left side rotate. Tries to keep the state as it is. As a result, between the pixel electrodes 34 and 35,
The liquid crystal molecules 33 near the boundary surface 37 have a response speed of the pixel electrode 3
It is slower than the change speed near the center of 4, 35.

The conventional active matrix type liquid crystal display device can display a still image with an image quality equal to or higher than that of a CRT. However, due to the response delay of liquid crystal molecules as described above, the image quality of a moving image is Lower than CRT. actually,
This response delay appears as an unnatural display when the color tone changes at high speed and a slow motion of the moving image display.

[0015]

In order to solve the above problems, the main invention disclosed in this specification is to cross signal lines and scanning lines in a matrix on a transparent substrate, and to form thin film transistors at the crossing parts. In an active matrix type liquid crystal display device in which transparent pixel electrodes are arranged, a liquid crystal material is sandwiched between a transparent substrate different from the transparent substrate and the transparent substrate, and a voltage is applied to the liquid crystal material to perform display. The pixel electrode includes a first pixel electrode located substantially in the center of a pixel region surrounded by a scanning line and a signal line, and a second pixel electrode having a shape surrounding at least two directions of the first pixel electrode,
The first and second pixel electrodes are connected to different first and second thin film transistors, respectively, and the first and second thin film transistors are connected to different signal lines and scanning lines, respectively.

FIG. 1 is a specific configuration diagram of the display device having the above configuration, and shows only one pixel cell which is a display unit. The signal lines 107 and 108 and the scanning lines 105,
106 are arranged in a grid pattern, and the central pixel electrode 101 made of a transparent electrode is arranged in the center of the grid part.
Further, a peripheral pixel electrode 102 formed of a "U" -shaped transparent electrode is arranged so as to surround substantially three sides of the central pixel. The peripheral pixel electrode 102 has about 3 pixels around the center pixel electrode 101.
It surrounds / 4. The central pixel electrode 101 corresponds to the first pixel electrode, and the peripheral pixel electrode 102 corresponds to the second pixel electrode. A first thin film transistor 103 is connected to the central pixel electrode 101, and a second thin film transistor 104 is connected to the peripheral pixel electrode 102. A scanning line 105 and a signal line 107 are connected to the thin film transistor 103, and a scanning line 106 and a signal line 108 are connected to the thin film transistor 104.

When displaying a moving image, the thin film transistor 104 is turned on and a voltage is applied only to the peripheral pixel electrode 102. Then, the thin film transistor 103 is turned on at a predetermined timing, and the central pixel electrode 101 is turned on.
Voltage is also applied. That is, about 3/4 of the liquid crystal in the peripheral portion of the pixel region responds first, and then the liquid crystal occupying the central region of the pixel region responds with a delay.

In the conventional example, even if electric charge is applied to the pixel electrode, the liquid crystal in the peripheral portion of the pixel electrode is affected by the liquid crystal outside the electrode and the response is slow. The liquid crystal in the peripheral portion of the pixel, which takes time, is made to respond first, and then the liquid crystal in the central region of the pixel is made to respond. Further, by appropriately setting the operation timings of the central pixel electrode 101 and the peripheral pixel electrode 102, the rise timing of the liquid crystal in the entire pixel region is made uniform. as a result,
Apparently, the liquid crystal in the pixel cell responds at high speed almost at the same time, so that the moving image can be displayed accurately.

In order to operate as described above, it is necessary to drive the first thin film transistor 103 and the second thin film transistor 104 by different driving circuits through different signal lines and scanning lines, respectively, at different timings.
As an example of specific timing, for example, an image signal for driving the first thin film transistor 103 is delayed by a natural number multiple of at least one frame period from the image signal for driving the second thin film transistor 104. It may be a signal that the user has.

Further, although the central pixel electrode 101 and the peripheral pixel electrode 102 are arranged apart from each other, in this case, the distance between them is important. As shown in FIG. 15B, when a voltage is applied between the pair of pixel electrodes, lines of electric force protrude from the boundary surface of the pixel, and therefore liquid crystal molecules not sandwiched between the pixel electrodes also respond. There is. FIG. 3 shows the result of measuring the position of the liquid crystal molecule in response to the applied voltage as the distance from the electrode. The separation distance is about 4 μm when a voltage of 5 V is applied. This means that when a voltage of 5 V is applied, the orientation of liquid crystal molecules located at a position about 4 μm away from the pixel electrode can be changed.
Therefore, when the applied voltage is 5 V, the distance between the central pixel electrode 101 and the peripheral pixel electrode 102 in FIG. 1 may be 4 μm or less.

Further, another invention disclosed in the present specification has a region of one unit for applying an electric field to the liquid crystal, and a plurality of electrodes are arranged in the region of the one unit, and the plurality of electrodes are arranged. As an electrode, one of the regions in contact with the periphery of the one unit region
/ 2 or more, and at least an electrode occupying the central portion of the region of one unit.

FIG. 1 is a specific configuration diagram of the display device having the above-mentioned configuration. One unit of pixel region defined as a pixel region is composed of a central pixel electrode 101 and a peripheral pixel electrode 102, and is a minimum display unit. It will be. The central pixel electrode 101 is disposed in the central portion of the pixel area that serves as a display unit, and the peripheral pixel electrode 10 is provided around the central pixel electrode 101.
2 are arranged.

In the invention having the above-mentioned structure, it is necessary that at least half or more of the central pixel electrode is occupied by the peripheral pixel electrode. In other words, it is necessary to occupy 1/2 or more of the peripheral pixel electrode of the display unit. This is because in the liquid crystal under the central pixel electrode, the ratio of the portion in contact with the liquid crystal outside the electrode is 50 with respect to the entire periphery.
This is because, when the ratio is at least%, the response delay of the liquid crystal due to the influence of the liquid crystal around the pixel region becomes significant even if the peripheral pixel electrode is driven at a timing earlier than that of the central pixel electrode. FIG.
In the configuration shown in FIG. 3, about 3/4 of the area in contact with the periphery of the pixel area is occupied by the peripheral pixel electrode 102,
The ratio of the portion where the liquid crystal under the central pixel electrode is in contact with the liquid crystal outside the electrode is about 25%.

According to another aspect of the present invention, there is a unit area for applying an electric field to the liquid crystal, and a plurality of electrodes are arranged in the area. It is characterized by having at least an electrode occupying ½ or more of a region in contact with the periphery and an electrode occupying a central region in the region.

According to another aspect of the invention, there is a region of one unit for applying an electric field to the liquid crystal, and a plurality of electrodes are arranged in the region. As the plurality of electrodes, the central portion of the region is arranged. It is characterized by having at least an electrode that occupies and an electrode that surrounds at least ½ of the circumference of the electrode.

According to another aspect of the invention, there is provided one unit area for displaying using liquid crystal, and a means for applying an electric field to a half or more area of the area in contact with the periphery of the one unit area. Means for applying an electric field to the center of the one unit area after the electric field from the means is applied to the liquid crystal.

The invention having the above structure will be specifically described with reference to FIG. FIG. 1 shows a region of one unit composed of the central pixel electrode 101 and the peripheral pixel electrode 102. In the configuration shown in FIG. 1, this one unit area serves as a pixel electrode. Here, the central pixel electrode 101 is an electrode occupying the central portion of a region of one unit, and the peripheral pixel electrode 102
Is about 3/4 of the area that touches the periphery of this 1 unit area
This is an electrode for applying an electric field to the region.

In the structure shown in FIG. 1, after the electric field is applied from the peripheral pixel electrode 102 to the liquid crystal, a predetermined timing is delayed and the electric field is applied from the central pixel electrode 101 to the liquid crystal. In this way, it is possible to realize a configuration in which an electric field is sequentially applied from the region in contact with the periphery of the pixel region to the central region of the pixel region with predetermined tinting. For this reason, the region in contact with the periphery of the pixel region having a slow response can be made to respond first, and as a result, the entire pixel can be made to respond uniformly at a high speed.

According to another aspect of the invention, there is provided a display device having at least a means for applying an electric field to a partial region of liquid crystal,
The means is 1 / of the area contacting the periphery of the partial area.
It has a function of first applying an electric field to two or more regions and then applying an electric field to another region.

Another structure of the invention is a display device having at least means for applying an electric field to a predetermined region of liquid crystal,
The means is characterized in that it has a function of sequentially applying an electric field from at least a part of the area in contact with the periphery of the predetermined area to the central portion and / or the central peripheral portion of the predetermined area.

According to another aspect of the invention, there is provided a display device having at least means for applying an electric field to a predetermined region of liquid crystal,
The means has a function of applying an electric field to at least a part of the area in contact with the periphery of the predetermined area and then applying an electric field to the central portion and / or the central peripheral portion of the predetermined area.

As a specific example of the above structure, as shown in FIG. 1, a peripheral pixel electrode 102 for applying an electric field to a region in contact with the periphery of a predetermined region which is a pixel region, and a central portion of the predetermined region. Central pixel electrode 101 for applying an electric field to the
Can be mentioned. By adopting such a configuration, the liquid crystal can be made to respond sequentially from the peripheral portion to the central portion of a predetermined area of the liquid crystal which becomes the pixel area, and the delay of the response due to the influence of the liquid crystal around the pixel area can be corrected. can do.

Further, the invention disclosed in this specification is characterized in that the peripheral pixel electrode is formed in a plane different from that of the central pixel electrode. By adopting such a configuration, the electric field can be more easily applied to the peripheral region of the central pixel electrode.

In order to solve the above-mentioned problems, another main configuration of the invention disclosed in this specification is to cross signal lines and scanning lines in a matrix on a transparent substrate, and to cross the intersections. A thin film transistor and a transparent pixel electrode are arranged, a liquid crystal material is sandwiched between a transparent substrate different from the transparent substrate and the transparent substrate, a voltage is applied to the liquid crystal material, and a display is performed. The electrode is composed of a first pixel electrode located substantially in the center of the pixel region surrounded by the scanning line and the signal line, and a second pixel electrode having a shape surrounding the first pixel electrode. Pixel electrodes are connected to different first and second thin film transistors, respectively, and the first and second thin film transistors are connected to different signal lines and scanning lines, respectively. The electrode, characterized in that it is formed on different planes.

Further, another structure of the present invention has transparent pixel electrodes arranged in a matrix on a transparent substrate, and the transparent pixel electrode is substantially in the center of a pixel region surrounded by scanning lines and signal lines. A second pixel electrode having a shape surrounding the first pixel electrode and a shape surrounding the first pixel electrode, and the first and second pixel electrodes are connected to different first and second thin film transistors, respectively. The first and second thin film transistors are connected to different signal lines and scanning lines, respectively, and an active matrix type liquid crystal display device in which the first pixel electrode and the second pixel electrode are formed on different planes. In the above, the input image signal is delayed by the frame memory and compared with the original signal to detect the moving part. When the moving part is detected, the second thin film transistor is connected to the first thin film transistor. And drives using previous image signal of one frame or more than driving the register.

FIG. 6 is a specific configuration diagram of the above invention,
7A and 7B are configuration diagrams of a pixel cell in an active matrix liquid crystal display device, FIG. 6A is a top view of the pixel, and FIG. 6B is a cross section taken along line aa ′ in FIG. 6A. It is a figure. As shown in FIG. 6A, a central pixel electrode 601 corresponding to a conventional pixel is provided on a light-transmitting substrate, and a peripheral pixel electrode 6 is used as a second pixel electrode.
02 is provided so as to contact the periphery of the central pixel electrode 601 and surround its four sides. A pixel thin film transistor 603 is connected to the central pixel electrode 601, and the peripheral pixel electrode 60
A thin film transistor 604 is connected to 2.

Further, the thin film transistors 603 and 604 have scanning lines 605 and 606 and signal lines 607 and 60, respectively.
8 are independently connected. Further, the scanning lines 605, 60
6. A drive circuit (not shown) is independently connected to each of the signal lines 607 and 608. Therefore, the central pixel electrode 601 and the peripheral pixel electrode 602 can be operated at different timings by different drive circuits.

Further, as shown in FIG. 6B, the peripheral pixel electrode 602 is arranged in the lower layer of the central pixel electrode 601, and the layer in which the central pixel electrode 601 is formed and the peripheral pixel electrode 602 are formed. SiN, Al ₂ O _{3 and}
An insulating film layer 609 is formed.

The peripheral pixel electrode 602 is replaced with the central pixel electrode 601.
By arranging in a layer different from the above, in the electrically insulated layer, wirings connected to the respective electrodes can be provided. For example, since the wiring pattern connected to the central pixel electrode 601 can be formed on the insulating film 609, it can be arranged across the peripheral pixel electrode 602. Therefore, the peripheral pixel electrode 602 can be arranged so as to surround the entire periphery of the central pixel electrode 601.

As shown in FIG. 6B, the central pixel electrode 601 and the peripheral pixel electrode 602 are the same as the central pixel electrode 6
The edges of 01 overlap each other. Since such a configuration is adopted, the peripheral pixel electrode 602 can apply a voltage to the peripheral portion of the central pixel electrode 601. Further, the central pixel electrode 601 and the peripheral pixel electrode 60
Since 2 and 2 partially overlap, misalignment in the process can be compensated. Therefore, the process margin can be increased.

As a specific operation, the central pixel electrode 601
The voltage is applied between the peripheral pixel electrodes 602 before the voltage is applied to the peripheral pixel electrodes 602. Then, the liquid crystal molecules sandwiched by the peripheral pixel electrodes 602 are aligned such that the direction of the major axis is parallel to the lines of electric force, and at the same time, the liquid crystal molecules at the periphery of the central pixel electrode 601 have the initial orientation state of the major axis of the molecules. From, it changes so that it may come along the electric line of force. For convenience, this is called the first response.

Next, a voltage is applied to the central pixel electrode 601 at a timing delayed by a predetermined time. As a result, the liquid crystal molecules sandwiched by the central pixel electrodes 601 are aligned such that the major axis direction is parallel to the lines of electric force. For convenience, this is the second
Response.

In the second response, the peripheral pixel electrode 602
Since the liquid crystal molecules around the central pixel electrode 601 have already responded by the application of the voltage from, the liquid crystal molecules between the central pixel electrodes 601 do not have a slow response regardless of the position, and the central pixel electrode 601 does not have a slow response. Can be made to respond uniformly over the entire area.

The relationship between the time T ₁ required for the first response and the time T ₂ required for the second response is T ₁ > T ₂ . This is because in the first response, the liquid crystal molecules sandwiched by the peripheral pixel electrodes 602 are affected by the peripheral liquid crystal molecules and the response is delayed. Where ΔT is T ₁ −T ₂ = Δ
Define as T. In the present invention, the time difference between applying the voltage to the peripheral pixel electrode 602 and applying the voltage to the central pixel electrode 601 is set to be ΔT. This makes it possible to realize a state in which the response of the liquid crystal at the center of the central pixel electrode and the response of the liquid crystal near the edge of the central pixel electrode respond simultaneously. This kind of operating state is
It is very useful for making color changes and moving pictures natural.

It is also possible to use chromium for the peripheral pixel electrode 602 also as a black matrix.
As a result, there is an advantage that it is possible to block the alignment disorder of the liquid crystal molecules in the pixel peripheral region.

According to another aspect of the present invention, there is provided a liquid crystal display device having a pixel region in which a plurality of pixel electrodes are arranged, wherein the pixel region has a first pixel electrode occupying a central region of the pixel region, and A second pixel electrode formed so as to surround the entire periphery of the first pixel electrode.

In the above structure, the pixel area is
For example, it means a region where one unit of display is arranged in a matrix. For example, in the case of the configuration shown in FIG.
A region formed by the peripheral pixel electrode 602 and the central pixel electrode 601 becomes a pixel region.

According to another aspect of the invention, there is provided a liquid crystal display device having a pixel region in which a plurality of pixel electrodes are arranged, wherein the pixel region has a first pixel electrode occupying a central region of the pixel region, and A second pixel electrode disposed so as to surround at least a part of the periphery of the first pixel electrode, and the first pixel electrode and the second pixel electrode are formed on different planes. It is characterized by being

In the above structure, the first pixel electrode and the second pixel electrode are formed on different planes, and especially the first pixel electrode is formed.
The edge portion of the pixel electrode and the second pixel electrode partially overlap each other.

As a concrete structure, the structure shown in FIG. 6B can be adopted. The peripheral pixel electrode 602 is disposed below the central pixel electrode 601, and an insulating film layer 609 is formed between the layer where the central pixel electrode 601 is formed and the layer where the peripheral pixel electrode 602 is formed.

In the invention disclosed in this specification,
It is preferable that the peripheral driving circuit for driving the pixel is configured by a polysilicon thin film transistor. By configuring the peripheral driving circuit with a polysilicon thin film transistor, the following advantages occur.

1. The pixel pitch of the active matrix can be reduced. When the active matrix is driven by using the TAB, the pitch of the TAB is limited to a size capable of being bonded to the glass substrate, and therefore the pitch of the active matrix cannot be reduced. When the drive circuit is built in the substrate, there is no bonding with the active matrix, and therefore the pitch of the matrix can be reduced.

2. The reliability of wiring connection can be improved. TA
When B is used, thousands of wirings are output from the active matrix to the outside, so that the probability of disconnection at the connection point of the TAB-active matrix substrate is high, whereas when the drive circuit is incorporated, the active matrix is active. The number of terminals that are external to the matrix substrate is about one-hundredth, and improvement in reliability can be expected.

3. The size of the display device can be reduced. T
In the case of using the AB, in a display device having a small screen size such as a viewfinder, the TAB of the drive circuit is larger than that of the active matrix, which is a hindrance to the volume reduction of the video camera. When the drive circuit is incorporated, the width of the circuit can be suppressed to 5 mm or less, which can contribute to downsizing of a display device such as a viewfinder.

[0055]

According to the invention disclosed in this specification, the pixel electrode is separated into the central pixel electrode and the peripheral pixel electrode, and the peripheral pixel electrode is driven in advance in the portion where "movement" is required on the screen, and the central pixel electrode is driven. When trying to do so, the liquid crystal material is made to easily respond to the applied voltage. That is, by making the liquid crystal in the area in contact with the periphery of the pixel, which takes a long time to respond, first and then making the liquid crystal in the central area of the pixel respond, it is apparent that the liquid crystal in the pixel responds almost simultaneously at a high speed. I have to.

Further, in the invention disclosed in this specification, the image signal is delayed by the frame memory, and the image signal data before and after the delay is compared to detect the moving part, and when the motion is detected, As described above, the peripheral pixel electrode is driven first, and the central pixel electrode is driven at a timing shifted by a natural number multiple of one frame so that a moving image is accurately displayed.

[0057]

【Example】

Example 1 FIG. 1 is a configuration diagram of one pixel cell of an active matrix type liquid crystal display device using the invention disclosed in this specification. The present embodiment is characterized in that the pixel electrode, which is conventionally composed of one pixel, is divided into a central pixel electrode and a pixel electrode surrounding the periphery in the present embodiment.

FIG. 1 is a specific configuration diagram of the display device having the above configuration, and shows only one pixel cell which is a display unit. The signal lines 107 and 108 and the scanning lines 105,
106 are arranged in a grid pattern, and a central pixel electrode 101 made of a transparent electrode is arranged at the center of the grid part, and a peripheral pixel electrode made of a "U" -shaped transparent electrode is formed so as to surround substantially three sides of the central pixel. 102 are arranged. Therefore, the peripheral pixel electrode 102 has about 3/4 of the circumference of the central pixel electrode 101.
Surrounds. A first thin film transistor 103 is connected to the central pixel electrode 101, and a second thin film transistor 104 is connected to the peripheral pixel electrode 102. A scanning line 105 and a signal line 107 are connected to the thin film transistor 103, and a scanning line 106 and a signal line 108 are connected to the thin film transistor 104. Scan lines 105, 106,
A drive circuit (not shown) is independently connected to each of the signal lines 107 and 108.

FIG. 2 is a cross sectional view of the pixel cell, in which the central pixel electrode 101 and the peripheral pixel electrode 1 are formed on the transparent substrate 110.
02 is formed. On the other transparent substrate 111,
A central pixel electrode 112 facing the central pixel electrode 101,
Peripheral pixel electrodes 113 facing the peripheral pixel electrodes 102 are formed respectively. In addition, the transparent substrates 110 and 111
A liquid crystal 114 is sealed between them.

When the screen to be displayed by the pixel cell is a still image, the conventional driving method may be adopted, and the central pixel electrode 101 plays the same role as that of the conventional pixel electrode to perform screen display.

When displaying a moving image, the central pixel electrode 1
In order to improve the operation speed of the boundary surface of 01 (the portion in contact with the surroundings), the central pixel electrode 101 and the peripheral pixel electrode 102 are driven at different timings so that a moving image is accurately displayed. First, the voltage is applied only to the peripheral pixel electrodes 102 and 113. FIG. 2B shows the peripheral pixel electrode 102,
The state of electric force lines 115 in the state where an electric field is applied only to 113 is shown.

As shown in FIG. 2B, the lines of electric force 114
Also acts on the outside of the peripheral pixel region, so that the liquid crystal molecules 114 sandwiched between the peripheral pixel electrodes 102 and 111 respond and the liquid crystal molecules 114 around the central pixel electrodes 101 and 112 respond in advance. , Its direction can be changed.

The liquid crystal molecules 1 sandwiched between the central pixel electrodes 101112 by the central pixel electrodes 101 and 112.
An electric field is applied to 14. The liquid crystal molecules 114 in this state are shown in FIG. In this state, the central pixel electrode 10
Since the liquid crystal molecules in the peripheral portions of Nos. 1 and 112 have previously responded to 114, the central pixel electrodes 101 and 112 are not affected by the liquid crystal molecules 114 in the regions where the electrodes 101, 102, 112 and 113 are not arranged. The liquid crystal molecules 114 in between can respond smoothly.

In this embodiment, the central pixel electrodes 101, 11
2 and the peripheral pixel electrodes 102 and 113 are arranged apart from each other, but the distance between them is important. As shown in FIG. 2A, when a voltage is applied from the pair of pixel electrodes, the lines of electric force 115 protrude from the boundary surface of the pixel. as a result,
Liquid crystal molecules 114 outside the boundary surface between the peripheral pixel electrodes 102 and 113 can also be made to respond.

FIG. 3 shows the result of measuring the position of the liquid crystal molecule in response to the applied voltage as the distance from the electrode. The separation distance is about 4 μm when a voltage of 5 V is applied. This means that when a voltage of 5 V is applied, the orientation of liquid crystal molecules located at a position about 4 μm away from the pixel electrode can be changed. Therefore, when the applied voltage is 5 V, the distance between the central pixel electrode 101 and the peripheral pixel electrode 102 in FIG. 1 may be 4 μm or less. It is sufficiently possible to form a separation distance of 4 μm in consideration of the resolution of photolithography of the current liquid crystal display device.

[Embodiment 2] In this embodiment, the display unit is 2.
A method of driving a pixel matrix including one pixel electrode will be described. In this embodiment, the pixel electrode has the same structure as in the first embodiment. Therefore, in order to operate the central pixel electrode and the peripheral pixel electrode independently, it is necessary to independently connect the thin film transistors which serve as switching elements to each of them and further to independently connect the driving circuit to these thin film transistors.

Generally, the peripheral drive circuit is composed of a signal line drive circuit and a scanning line drive circuit. The signal line driver circuit and the scanning line driver circuit operate integrally to drive one thin film transistor in each pixel region. In this embodiment, two thin film transistors that perform different operations are arranged in the central pixel region and the peripheral pixel region, so that two or more signal line driving circuits and at least two scanning line driving circuits are required. .

FIG. 4 is a schematic block diagram of the liquid crystal display device of this embodiment. As shown in FIG. 4A, in the pixel matrix 401, pixel cells each including the central pixel electrode and the peripheral pixel electrodes shown in FIGS. 1 and 2 are arranged in a matrix. A signal line driver circuit 402 and a scan line driver circuit 404 are connected to the pixel matrix 401 by a signal line and a scan line, respectively, in order to control a thin film transistor connected to the central pixel electrode. Furthermore, in order to control the thin film transistor connected to the peripheral pixel electrode, the signal line driving circuit 40
3. The scanning line drive circuit 605 is connected to the pixel matrix 401 by a signal line and a scanning line, respectively. The signal line driving circuits 402 and 403 include motion detection circuits 406, respectively.
The output of is connected.

The signal line driving circuits 402 and 403 and the scanning line driving circuits 404 and 405 are arranged so as to surround the four sides of the pixel matrix 401 and the pixel matrix 40.
1, the signal line drive circuits 402 and 403 face each other,
The scan line driver circuits 404 and 405 face each other. FIG.
FIG. 4B shows a modified example of the arrangement of the peripheral drive circuits.
The same reference numerals as those in (a) indicate the same members. Figure 4 (b)
2, the signal line driver circuits 402 and 403 and the scanning line driver circuits 404 and 405 are arranged so as to surround two sides of the pixel matrix 401, and the signal line driver circuit 40.
2 and 403 and scanning line drive circuits 404 and 405 are arranged on the same side. However, the signal line drive circuit 40
2, 403 and the scanning line driving circuits 404 and 405 do not share a signal line and a scanning line, respectively.

FIG. 5 is a block diagram of a system for giving a display signal to the signal line drive circuits 402 and 403. In this system, an image signal input from the outside is a digital signal and a signal output from the system. Is also a digital signal. As shown in FIG. 5, the frame memory 40
7. An image signal is externally input to each of the motion detection circuits 406. The output of the frame memory 407 is the motion detection circuit 406, the signal line drive circuit 403, the frame memory 4
08, and the output of the frame memory 408 is connected to the signal line drive circuit 402.

An image signal is externally input to the frame memory 407 and stored as image data for one frame. The frame memory 407 outputs the stored image data to the frame memory 408. The frame memory 408 stores the image data. When the image data is output to the frame memory 408, the frame memory 407
New image data is input from the outside, and the stored image data is updated. That is, the frame memory 407 updates the image data every time the image data is output to the frame memory 408.
The image data stored in 07 is the frame memory 40.
The data is one frame ahead of the image data stored in No. 8.

An image signal from the outside and image data stored in the frame memory 407 are input to the motion detection circuit 406. In the motion detection circuit 406,
It is determined whether or not there is a "motion" component in the image signal from the outside. Since the image data input from the frame memory 407 is one frame after the image signal from the outside, the image data input from the frame memory 407 is used as a reference, and “motion” is calculated from the image signal input from the outside. ”Component is detected. Therefore, the two input image data are subtracted to create a difference signal, and after removing the noise component from this difference signal, it is determined whether or not "motion" is exhibited.

When the differential signal does not indicate "motion", a drive signal is output from the motion detection signal 406 to the signal line drive circuit 402, and when the drive signal is input to the signal line drive circuit 402, a signal is output. The thin film transistor is driven through the line to write the image data to the central pixel electrode as in the conventional pixel electrode.

When the difference signal indicates “motion”, a drive signal is output from the motion detection signal 406 to the signal line drive circuit 403. When the drive signal is input, the signal line driver circuit 403 drives the thin film transistor through the signal line and writes the image data stored in the frame memory 407 to the peripheral pixel electrode. At the same time, the image data stored in the frame memory 407 is output to the frame memory 408 and, after being delayed, the thin film transistor is driven by the signal line drive circuit 402 to be written in the central pixel and the central pixel and the peripheral pixels. Image data of the same frame is displayed on the pixel.

In this way, the two frame memories 40
By storing the image data in 7, 408, the image data to be written in the central pixel can be delayed and the timing of writing the image data in the peripheral pixels can be set to be one frame ahead of the central pixel. With, there is no difference in response between the central part and the peripheral part, and it is possible to accurately display a moving image.

Although the example of FIG. 6 assumes digital signal processing, when the image signal is analog, when the image signal is input to the frame memories 407 and 408, it is converted into a digital signal by an AD converter. Thus, the output signals from the signal line driver circuits 402 and 403 may be converted into analog signals by the DA converter and output to the pixel matrix.

[Third Embodiment] This embodiment is a modification of the first embodiment and is characterized in that the central pixel electrode and the peripheral pixel electrode are arranged so as to overlap each other. The pixel cell has a structure in which a nematic liquid crystal material is sandwiched between a pair of light-transmitting glass substrates. FIG. 6A is a top view of one pixel region and FIG. It is sectional drawing cut | disconnected by the line aa 'of FIG.6 (a). Further, FIG. 7 is a cross-sectional configuration diagram of the pixel cell.

As shown in FIG. 6A, a central pixel electrode 601 corresponding to a conventional pixel is provided. A peripheral pixel electrode 602 is provided so as to contact the periphery of the central pixel electrode 601 and surround the periphery thereof. Central pixel electrode 601
A pixel thin film transistor 603 is connected to the pixel pixel thin film transistor 603, and a pixel thin film transistor 604 is connected to the peripheral pixel electrode 602. Scanning lines 605 and 606 are connected to the gate electrodes of the thin film transistors 603 and 604, respectively, and signal lines 607 and 608 are independently connected to the source electrodes. Further, drive circuits (not shown) are independently connected to the scanning lines 605 and 606 and the signal lines 607 and 608, respectively.

Further, as shown in FIG. 6B, the peripheral pixel electrode 602 is arranged under the central pixel electrode 601, and the layer in which the central pixel electrode 601 is formed and the peripheral pixel electrode 162 are formed. An insulating film layer 609 is formed between the layers.

A method for manufacturing an active matrix panel of a liquid crystal display device will be described below. First transparent substrate 610
# 7059 glass substrate (thickness 1.1 mm) or # 1713 glass substrate (thickness 1.1
mm) is used. A thin film transistor for driving a pixel electrode, a peripheral pixel electrode, and a central pixel electrode are formed on the transparent substrate 610. The required number of pixels is formed in a matrix.

The transparent substrate 610 is formed by the usual sputtering method.
A peripheral pixel electrode 602 is formed by depositing chromium on the upper surface to a thickness of 1000Å and patterning it. The peripheral pixel electrode 602 also functions as a black matrix. The peripheral pixel electrode 602 and the thin film transistor 60 are formed simultaneously with, before, or after the formation of the peripheral pixel electrode 602.
A wiring pattern (not shown) for connecting with 4 is formed.

An aluminum oxide film is formed on the peripheral pixel electrode 602 by a sputtering method and is patterned to form an insulating film 609. Note that the insulating film 609 may be formed using silicon nitride. Further, a thickness 10 is formed on the insulating film 609.
An ITO film of 00Å is formed by a sputtering method. ITO
The film is patterned to form the central pixel electrode 601. A wiring pattern for connecting the central pixel electrode 601 and the thin film transistor 603 is formed at the same time as, or before or after the formation of the central pixel electrode 601.

What is important here is the central pixel electrode 601.
The wiring connecting the thin film transistor 603 and the thin film transistor 603 is formed on the insulating film 609, and the peripheral pixel electrode 602 and the thin film transistor 6 are connected.
That is, the wiring connecting the wirings 04 and 04 is formed under the insulating film 609. By adopting such a configuration, the central pixel electrode 601 and the peripheral pixel electrode 602 can be disposed so as to partially overlap with each other, or the peripheral pixel electrode 602 can be disposed so as to entirely surround the central pixel electrode 601. . Although not described in detail here, a peripheral drive circuit region and the like are formed by thin film transistors on the first transparent substrate 610.

Further, as the second transparent substrate 602, # 7059 (thickness: 1.1 mm) or # 17 manufactured by Corning Incorporated is used.
A 37 (1.1 mm thick) glass substrate is used. On the substrate, the counter electrodes of the central pixel electrode 601 and the peripheral pixel electrode 602 formed on the first transparent substrate 610 are formed, respectively.

On the transparent substrate 611, chromium having a thickness of 1000 Å is formed by sputtering. Then, by patterning, the peripheral pixel electrode 61 facing the peripheral pixel electrode 602
Form 2 The peripheral pixel electrode 612 also functions as a black matrix. Next, an aluminum oxide film is formed on the peripheral pixel electrode 612 by a sputtering method and patterned to form an insulating film 613. Further, an ITO film having a thickness of 1000 Å is formed on the insulating film 613 by a sputtering method. The ITO film is patterned to form a center pixel electrode 614 as an electrode facing the center pixel electrode 601. The center pixel electrode 614 may be formed solidly on the entire surface without patterning. Through the above process, a pair of translucent substrates that constitute the liquid crystal display device is completed.

Next, an alignment film (not shown) for controlling the alignment of the liquid crystal material is formed on the surfaces of the transparent substrates 610 and 611 in contact with the liquid crystal. A polyimide resin is formed as an alignment film, and a rubbing process is performed. Since the TN type is used in this embodiment, the rubbing directions are made to be orthogonal to each other between the transparent substrates 610 and 611.

Then, the transparent substrate 61 is opened at a predetermined interval.
0 and 611 are pasted together with an epoxy adhesive.
At this time, the spacing between the transparent substrates 610 and 611 is controlled by using a spherical spacer having a diameter of 5.0 μm. Then, a liquid crystal material is injected between the first and second substrates 610 and 611. As the injection method, for example, a vacuum injection method may be used.

When displaying a still image, the central pixel electrodes 601 and 614 may be driven similarly to the conventional example. The central pixel electrodes 601 and 614 perform the same screen display as the conventional pixel electrodes.

When displaying a moving image, two kinds of pixel electrodes are operated at different timings to improve the display speed. Therefore, the voltage is applied from the peripheral pixel electrode, and the voltage is applied from the central pixel electrode with a predetermined timing delay.

FIG. 7 shows a state in which a voltage is applied only between the peripheral pixel electrodes 602 and 612 between the pair of transparent substrates 610 and 611, and FIG.
7B, the liquid crystal molecules 61 are shown in FIG.
6 shows the state of No. 6.

The voltage is applied between the peripheral pixel electrodes 602 and 612 before the voltage is applied to the central pixel electrodes 601 and 614. Therefore, the liquid crystal molecules 616 in the peripheral region of the central pixel region change from the initial alignment state so that the direction of the molecular long axis follows the direction of the electric force lines 615. Next, the voltage is applied to the central pixel electrodes 601 and 614 at a timing slightly delayed. In the state where the voltage is applied between the central pixel electrodes 601 and 614, the liquid crystal molecules on the periphery of the central pixel region have already responded to the voltage applied from the peripheral pixel electrodes 602 and 612. Therefore, the central pixel electrodes 601 and 614
The response of the liquid crystal molecules to the voltage due to is not delayed in the liquid crystal in the peripheral region, and a uniform response can be made in the entire region of the central pixel.

In this embodiment, the peripheral pixel electrodes 602 and 612 are arranged.
Since it was made of chrome that also served as a black matrix,
The peripheral pixel electrodes 602 and 612 are replaced with the central pixel electrodes 601 and 6
Even when operated at a timing different from 14, there is an advantage that it is possible to shield the alignment disorder of the liquid crystal molecules in the pixel peripheral region. The driving circuit of the second embodiment can be used to drive the pixel cells shown in FIGS.

If the central pixel electrode and the peripheral pixel electrode can be operated independently, the configuration shown in FIG. 8 can be adopted. 8, the same reference numerals as those in FIG. 6 represent the same members. As shown in FIG. 8, the pixel thin film transistor 603 is connected to the central pixel electrode 601, and the pixel thin film transistor 10 is connected to the peripheral pixel electrode 102.
4 are connected. Gate electrodes of these thin film transistors are connected to the same scanning line 605, while source electrodes thereof are connected to different signal lines 607 and 608, respectively.

By adopting the configuration shown in FIG. 8, compared with the configuration shown in FIG. 6, the thin film transistors 603 and 6 are provided.
The arrangement of 04 is simpler and the number of scanning lines required for the same number of pixels can be reduced by half, so that the aperture ratio of pixels can be improved.

Furthermore, since the thin film transistors 603 and 604 are connected to the common scanning line 605, the scanning line driving circuit 1 is used as the peripheral circuit for driving the pixels, as in the conventional example.
It is only necessary to provide one, and for example, the configuration shown in FIG. 9 can be adopted corresponding to FIG.

As shown in FIG. 9, a pixel matrix 901
Are connected to two signal line drive circuits 902 and 903 and a scanning line drive circuit 904 so as to surround three sides of the pixel matrix, and the signal line drive circuits 902 and 903 are connected to a motion detection circuit 906, respectively. ing. Although the scan line driver circuit 904 is common, the signal line driver circuits 902 and 9 are used.
03 is provided independently, so the central pixel electrode 60
1. Different image signals can be input to the peripheral pixel electrode 602. Therefore, as in the second embodiment, the motion detection circuit 906 determines whether or not there is a “motion” component in the image signal, and controls the central pixel electrode 601 and the peripheral pixel electrode 602 independently, thereby stopping Picture,
Both videos can be displayed well.

[0097]

[Effect] According to the present invention, a pixel is divided into two regions, a central pixel and a surrounding pixel, and when a high speed operation is required for a screen,
By operating the peripheral pixels in advance of the central pixel, the operating speed of the central pixel can be improved. Therefore, it is possible to improve the operation speed of the liquid crystal display device, and it is possible to provide the user with a display with higher image quality.

[Brief description of drawings]

FIG. 1 is a top view of a pixel cell according to a first exemplary embodiment.

2A and 2B are cross-sectional configuration diagrams of a pixel cell, FIG. 2A is a schematic diagram for explaining a response of liquid crystal, and FIG. 2B is a schematic diagram of lines of electric force.

FIG. 3 is a graph showing the relationship between the applied voltage and the distance of responsive liquid crystal molecules from the electrode.

FIG. 4 is a schematic diagram of an active matrix type liquid crystal display device according to a second embodiment.

FIG. 5 is a block circuit diagram of a motion detection system.

FIG. 6 is a top view of a pixel electrode according to a third exemplary embodiment.

7A and 7B are cross-sectional configuration diagrams of a pixel electrode, FIG. 7A is a schematic diagram of lines of electric force, and FIG. 7B is a schematic diagram illustrating response of liquid crystal molecules.

FIG. 8 is a top view of a pixel electrode according to a modification of the third embodiment.

FIG. 9 is a schematic view of an active matrix type liquid crystal display device.

FIG. 10 is a schematic configuration diagram of a conventional active matrix type liquid crystal display device.

FIG. 11 is a schematic diagram of a pixel matrix of a conventional example.

FIG. 12 is a drive waveform diagram of an active matrix of a conventional example.

FIG. 13 is a transmittance-applied voltage characteristic diagram of a TN liquid crystal.

FIG. 14 is a response characteristic diagram of a TN liquid crystal.

FIG. 15 is a schematic diagram illustrating a response of liquid crystal molecules of a pixel electrode of a conventional example.

[Explanation of symbols]

Central pixel electrode: 101, 112, 601, 61
4 peripheral pixel electrodes: 102, 113, 602, 61
2 Thin film transistors: 103, 104, 603, 60
4 scanning lines: 105, 106, 605, 60
6 signal lines: 107, 108, 607, 60
8 Transparent substrate: 110, 111, 610, 61
1 signal line drive circuit: 402, 403, 902, 90
3 Scan line drive circuit: 404, 405, 904 Motion detection circuit: 406, 906 Frame memory: 407, 408 Insulating film: 609, 613

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location H01L 29/786 21/336 (72) Inventor Misako Nakazawa 398 Hase, Atsugi-shi, Kanagawa Semiconductor Co., Ltd. Energy Research Laboratory (72) Inventor Takeshi Nishi 398 Hase, Atsugi City, Kanagawa Prefecture Semiconductor Energy Research Laboratory, Ltd.

Claims (21)

[Claims] 1. A liquid crystal material is provided between a transparent substrate different from the transparent substrate and the transparent substrate, wherein signal lines and scanning lines are crossed in a matrix on the transparent substrate, and thin film transistors and transparent pixel electrodes are arranged at the intersecting portions. In the active matrix type liquid crystal display device for sandwiching the liquid crystal material and applying a voltage to the liquid crystal material by the two transparent pixel electrodes, the two transparent pixel electrodes are surrounded by the scanning lines and the signal lines. A first pixel electrode located substantially in the center of the exposed pixel region and a second pixel electrode having a shape surrounding at least two directions of the first pixel electrode,
The second pixel electrode is connected to different first thin film transistors and second thin film transistors, respectively, and the first thin film transistor and second thin film transistor are connected to different signal lines and scanning lines, respectively. Liquid crystal display device characterized by. 2. The first transistor and the second thin film transistor according to claim 1, wherein the first driving circuit and the second driving circuit are different from each other via the signal line and the scanning line, respectively. A liquid crystal display device, which is driven at different timings. 3. The image signal according to claim 2, wherein the first drive circuit is an image signal having a time lag of at least one natural period times one frame period longer than an image signal for driving the second drive circuit. A liquid crystal display device characterized by being driven. 4. The liquid crystal display device according to claim 2, wherein the second drive circuit operates only when the image signal includes a motion component. 5. A transparent substrate having transparent pixel electrodes arranged in a matrix, the transparent pixel electrode being a first pixel electrode located substantially in the center of a pixel region surrounded by scanning lines and signal lines. , A second pixel electrode having a shape surrounding at least two directions of the first pixel electrode, wherein the first pixel electrode and the second pixel electrode are respectively different first thin film transistors and second thin film transistors. In the liquid crystal display device in which the first transistor and the second thin film transistor are connected to the different signal line and scanning line, respectively, the input image signal is delayed by the frame memory and compared with the source signal. And a moving portion is detected, and when the moving portion is detected, the second thin film transistor is driven by one frame than driving the first thin film transistor. A method for driving a liquid crystal display device, characterized in that the liquid crystal display device is driven by using an image signal that is equal to or more than a frame. 6. A unit area for applying an electric field to the liquid crystal, wherein a plurality of electrodes are arranged in the area, and the plurality of electrodes are ½ of the area in contact with the periphery of the area. A liquid crystal display device comprising at least an electrode occupying the above and an electrode occupying a central portion in the region. 7. A region having one unit for applying an electric field to the liquid crystal, wherein a plurality of electrodes are arranged in the region, and the plurality of electrodes are arranged in contact with the periphery of the one unit region. A liquid crystal display device comprising at least an electrode occupying ½ or more and an electrode occupying a central region in the region. 8. An area having one unit for applying an electric field to the liquid crystal, wherein a plurality of electrodes are arranged in the area, and an electrode occupying a central portion of the area as the plurality of electrodes, A liquid crystal display device comprising: at least an electrode that surrounds at least ½ of the circumference of the electrode. 9. A means for applying an electric field to one-half or more of an area in contact with the periphery of the area, which has one unit area for displaying using liquid crystal, and an electric field from the means applies to the liquid crystal. And a means for applying an electric field to the central portion of the one unit area after being processed. 10. A liquid crystal display device comprising at least means for applying an electric field to a part of the liquid crystal, wherein the means is 1 /
A liquid crystal display device having a function of first applying an electric field to two or more regions and then applying an electric field to other regions. 11. A liquid crystal display device comprising at least means for applying an electric field to a predetermined region of liquid crystal, said means comprising at least a part of a peripheral portion of the predetermined region to a central portion of the predetermined region. And / or a liquid crystal display device having a function of sequentially applying an electric field to the central peripheral portion. 12. A liquid crystal display device comprising at least means for applying an electric field to a predetermined region of liquid crystal, wherein the means applies the electric field to at least a part of a peripheral portion of the predetermined region, and then the predetermined area. A liquid crystal display device having a function of applying an electric field to a central portion and / or a peripheral portion of the region. 13. A liquid crystal material is arranged between a transparent substrate different from the transparent substrate and the transparent substrate, wherein signal lines and scanning lines are crossed in a matrix on the transparent substrate, and thin film transistors and transparent pixel electrodes are arranged at the intersections. In the active matrix type liquid crystal display device for sandwiching the liquid crystal material and applying a voltage to the liquid crystal material, the transparent pixel electrode is the first pixel electrode located substantially in the center of the pixel region surrounded by the scanning lines and the signal lines. The second pixel electrode has a shape surrounding the first pixel electrode, and the first and second pixel electrodes are connected to different first and second thin film transistors, respectively. Are connected to different signal lines and scanning lines, respectively, and the first pixel electrode and the second pixel electrode are formed on different planes from each other. Place. 14. The liquid crystal display device according to claim 13, wherein the first and second thin film transistors are driven at different timings by different drive circuits via different signal lines and scanning lines, respectively. 15. The driving circuit according to claim 14, wherein the first driving circuit is 1% more than an image signal driving the second driving circuit.
A liquid crystal display device, which is driven by an image signal having a time delay that is at least one natural time multiple of a frame period. 16. The liquid crystal display device according to claim 14, wherein the second drive circuit operates only when the image signal includes movement. 17. A first pixel electrode having transparent pixel electrodes arranged in a matrix on a transparent substrate, the transparent pixel electrode being located substantially at the center of a pixel region surrounded by scanning lines and signal lines. And a second pixel electrode having a shape surrounding the first pixel electrode, wherein the first and second pixel electrodes are connected to different first thin film transistors and second thin film transistors, respectively. In the active matrix liquid crystal display device, the first and second thin film transistors are connected to different signal lines and scanning lines, respectively, and the first pixel electrode and the second pixel electrode are formed on different planes. , The input image signal is delayed by the frame memory, the moving image is detected by comparing the delayed image signal with the original signal, and when the moving image is detected, ,
A method for driving a liquid crystal display device, characterized in that the second thin film transistor is driven by using an image signal which is at least one frame ahead of an image signal which drives the first thin film transistor. 18. A liquid crystal display device having a pixel region in which a plurality of pixel electrodes are arranged, wherein the pixel region includes a first pixel electrode occupying a central region of the pixel region, and the first pixel electrode. A second pixel electrode formed so as to surround the entire periphery, and a liquid crystal display device. 19. The liquid crystal display device according to claim 18, wherein the first pixel electrode and the second pixel electrode are formed on different planes. 20. A liquid crystal display device having a pixel region in which a plurality of pixel electrodes are arranged, wherein the pixel region has a first pixel electrode occupying a central region of the pixel region, and the first pixel. A second pixel electrode arranged so as to surround at least a part of the periphery of the electrode, and the first pixel electrode and the second pixel electrode are formed on different planes. Liquid crystal display device. 21. The liquid crystal display device according to claim 20, wherein an edge portion of the first pixel electrode and a portion of the second pixel electrode overlap each other.