JP3662316B2 - Liquid crystal display device and driving method of liquid crystal display device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an active matrix liquid crystal display device and a driving method thereof.
[0002]
[Prior art]
Conventionally, a CRT is the most common display device. However, since 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 display devices using plasma or liquid crystal have been developed. Particularly in recent years, among liquid crystal display devices, active matrix type liquid crystal display devices are becoming widespread.
[0003]
FIG. 10 is a block diagram of a conventional active matrix liquid crystal display device. A signal line driving circuit 4 and a scanning line driving circuit 5 are connected to a pixel matrix 1 by signal lines 2 and scanning lines 3.
[0004]
FIG. 11 is a configuration diagram of a pixel matrix 1 of a conventional example. 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 arranged at intersections thereof. ing. In the thin film transistors 17 to 20, the source electrodes are connected to the signal lines 11 to 13, and the gate electrodes are connected to the scanning lines 14 to 16. 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.
[0005]
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, and FIG. 12A shows the potential V applied to the source electrode of the thin film transistor. _S FIG. 12B shows the potential V applied to the gate electrode. _G FIG. 12C shows the potential V of the drain electrode. _D It is.
[0006]
When the thin film transistors 17 to 20 are N-channel, the gate electrode is high (the potential V of the gate electrode _G Is on the positive side), the thin film transistors 17 to 20 are turned on, and the potential V of the source electrode _S And drain electrode potential V _D Operate to be equal. With this operation, the potentials of the signal lines 11 to 13 are written into the storage capacitors 25 to 28. Next, when the gate electrodes of the thin film transistors 17 to 20 become low (negative potential of the gate electrode), 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 to 28 are held until the thin film transistors 17 to 20 are turned on next time and writing occurs again. In addition, the liquid crystal cells 21 to 24 in FIG. 11 sandwiched between the counter electrode and the pixel electrode are applied with a differential voltage between the two electrodes, and the polarization characteristics of the light change according to the voltage. Then, through the polarizing plate, the transmittance finally changes, and light and dark are formed.
[0007]
That is, the liquid crystal display device uses the fact that the liquid crystal substance has different dielectric constants in the direction parallel to and perpendicular to the molecular axis, and controls the polarization of light, the amount of transmitted light, and the amount of scattering. To display light and dark. As the liquid crystal material, TN liquid crystal, STN liquid crystal, ferroelectric liquid crystal and the like are generally used.
[0008]
In addition, a peripheral driving circuit for driving a pixel includes a method of manufacturing a single crystal silicon transistor integrated circuit and a thin film transistor using polysilicon, and is integrally formed on the same glass substrate as the active matrix. There is a method of manufacturing. The drive circuit made of single crystal silicon is usually connected to the 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 drive circuit is connected to the active matrix not by TAB or COG but by metal wiring on the substrate.
[0009]
[Problems to be solved by the present invention]
In the conventional active matrix type liquid crystal display device, TN liquid crystal is mainly used as the liquid crystal material because of its low cost and easy alignment control. The TN liquid crystal has transmittance-applied voltage (V) characteristics as shown in FIG. As shown in FIG. 13, the transmittance-applied voltage (V) characteristic has a relatively gentle curve slope, so that a liquid crystal display device using TN liquid crystal can perform gradation display by the applied voltage.
[0010]
However, the TN liquid crystal has a problem that the response to the applied voltage is slow. In general, in a liquid crystal display device using TN liquid crystal, when the tone changes from black to white as shown in FIG. 14 or vice versa, a response delay of 10 msec to several tens msec occurs. To do. In particular, when focusing on one display pixel, when the gradation changes from black to white, the gradation at the center of the pixel changes first, and after that, the gradation at the periphery of the display pixel changes. Observed. This delay in response is caused by a phenomenon in which there is a difference in response time when an electric field is applied between the peripheral portion and the central portion of the liquid crystal in the pixel region.
[0011]
The above phenomenon will be described with reference to FIGS. 15 (a) and 15 (b). FIG. 15A in a state where a voltage is applied to the pixel electrode is a schematic diagram of liquid crystal molecules in the liquid crystal cell, and FIG. 15B is a schematic diagram of electric lines of 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 a pair of transparent pixel electrodes 34 and 35 are opposed to the glass substrates 31 and 32. Is provided. In addition to the components shown in the figure, an alignment film and a switching thin film transistor are provided, but the description thereof is omitted in FIG. Further, by sandwiching the configuration shown in FIG. 15A between a pair of deflecting plates, a liquid crystal display device having the most basic configuration can be obtained.
[0012]
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 molecular axes of the liquid crystal molecules 33 are aligned along the electric force lines 36 shown in FIG. Are aligned in a uniform direction. As a result, the polarization state of the light transmitted through the liquid crystal molecules 33 changes.
[0013]
However, at the periphery of the pixel electrodes 34 and 35, the liquid crystal molecules 33 from the right side, that is, the center, rotate to change the direction from the boundary surface 37, while the left liquid crystal molecules 33 remain as they are. Try to keep state. As a result, the response speed of the liquid crystal molecules 33 in the vicinity of the boundary surface 37 between the pixel electrodes 34 and 35 is slower than the change speed in the vicinity of the center of the pixel electrodes 34 and 35.
[0014]
The conventional active matrix type liquid crystal display device can display a still image with an image quality equivalent to or better than that of a CRT. Low. Actually, this response delay appears as an unnatural display when the color tone changes at high speed and a dull motion of the moving image display.
[0015]
[Means for solving the problems]
In order to solve the above problems, the main invention disclosed in this specification is as follows.
A signal line and a scanning line are crossed in a matrix on a transparent substrate, a thin film transistor and a transparent pixel electrode are disposed at the crossing portion, a liquid crystal material is sandwiched between the transparent substrate different from the transparent substrate, and the transparent substrate, In an active matrix type liquid crystal display device that performs display by applying a voltage to a liquid crystal material,
The transparent pixel electrode includes 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 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.
[0016]
FIG. 1 is a specific configuration diagram of a display device having the above configuration, and shows only one pixel cell serving as a display unit. The signal lines 107 and 108 and the scanning lines 105 and 106 are arranged in a lattice shape, and a central pixel electrode 101 made of a transparent electrode is disposed in the center of the lattice portion. Further, a peripheral pixel electrode 102 made of a “U” -shaped transparent electrode is disposed so as to surround substantially three sides of the central pixel. The peripheral pixel electrode 102 surrounds approximately 3/4 of the periphery of the central pixel electrode 101. 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.
[0017]
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 with a predetermined delay, and a voltage is also applied to the central pixel electrode 101. That is, about 3/4 of the liquid crystal around the periphery of the pixel region responds first, and then the liquid crystal occupying the central region of the pixel region responds with a delay.
[0018]
In the conventional example, even when a charge is applied to the pixel electrode, the liquid crystal at the peripheral edge of the pixel electrode is affected by the liquid crystal outside the electrode, and the response is slow. However, in the present invention, the response takes time in advance. The liquid crystal in the peripheral part of the pixel is made to respond first, and then the liquid crystal in the central region of the pixel is made to respond. Furthermore, by appropriately setting the operation timings of the central pixel electrode 101 and the peripheral pixel electrode 102, the timing at which the liquid crystal rises in the entire pixel region is aligned. As a result, it is possible to display the moving image accurately by seemingly causing the liquid crystals in the pixel cells to respond at high speed almost at the same time.
[0019]
In order to operate as described above, the first thin film transistor 103 and the second thin film transistor 104 need to be driven at different timings by different driving circuits through different signal lines and scanning lines, respectively. As an example of specific timing, for example, the 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 has.
[0020]
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. 15 (b), when a voltage is applied by a pair of pixel electrodes, electric lines of force protrude from the boundary surface of the pixels, so that liquid crystal molecules not sandwiched between the pixel electrodes also respond. Yes. FIG. 3 shows the result of measuring the position of the liquid crystal molecules in response to the applied voltage as the separation distance from the electrode. For a voltage application of 5V, the separation distance is about 4 μm. This means that when a voltage of 5 V is applied, the direction 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 within 4 μm.
[0021]
Furthermore, other inventions disclosed in this specification are:
Having a unit area for applying an electric field to the liquid crystal;
A plurality of electrodes are arranged in the one unit region,
As the plurality of electrodes,
An electrode occupying 1/2 or more of the area in contact with the periphery of the one unit area;
An electrode occupying a central portion in the one unit region;
It is characterized by having at least.
[0022]
FIG. 1 is a specific configuration diagram of a display device having the above-described configuration. One unit of pixel area defined as a pixel area is composed of a central pixel electrode 101 and a peripheral pixel electrode 102, and is a minimum unit of display. It is. A central pixel electrode 101 is disposed at the center of the pixel area serving as a display unit, and a peripheral pixel electrode 102 is disposed around the central pixel electrode 101.
[0023]
In the invention having the above configuration, it is necessary that at least a half or more of the central pixel electrode is occupied by the peripheral pixel electrode. In other words, it is necessary to occupy more than half of the peripheral region of the display unit in the peripheral pixel electrode. In the liquid crystal under the central pixel electrode, when the ratio of the portion in contact with the liquid crystal outside the electrode is 50% or more with respect to the entire periphery, even if the peripheral pixel electrode is driven at an earlier timing than the central pixel electrode, This is because the response delay of the liquid crystal due to the influence of the liquid crystal around the pixel region becomes significant. In the configuration shown in FIG. 1, about 3/4 of the area in contact with the periphery of the pixel area is occupied by the peripheral pixel electrode 102, and 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%. It has become.
[0024]
Other aspects of the invention are:
Having a unit area for applying an electric field to the liquid crystal;
A plurality of electrodes are arranged in the region,
As the plurality of electrodes,
An electrode occupying 1/2 or more of the area in contact with the periphery of the one unit area;
An electrode occupying a central region in the region;
It is characterized by having at least.
[0025]
Other aspects of the invention are:
Having a unit area for applying an electric field to the liquid crystal;
A plurality of electrodes are arranged in the region,
As the plurality of electrodes,
An electrode occupying a central portion in the region;
An electrode disposed around at least half of the circumference of the electrode;
It is characterized by having at least.
[0026]
Other aspects of the invention are:
It has one unit area for display using liquid crystal,
Means for applying an electric field to a region that is at least half of the region in contact with the periphery of the unit region;
Means for applying an electric field to the central portion of the one unit region after the electric field from the means is applied to the liquid crystal;
It is characterized by having at least.
[0027]
The invention having the above configuration will be specifically described with reference to FIG. FIG. 1 shows an area 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 region is a pixel electrode. Here, the central pixel electrode 101 is an electrode that occupies the center of one unit region, and the peripheral pixel electrode 102 is an electrode for applying an electric field to a region that is approximately 3/4 of the region in contact with the periphery of the one unit region. It is.
[0028]
In the configuration shown in FIG. 1, after an electric field is applied from the peripheral pixel electrode 102 to the liquid crystal, a predetermined timing is delayed and an 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 with a predetermined lining from the area in contact with the periphery of the pixel area to the center area of the pixel area. For this reason, the area | region which contacted the periphery of the pixel area | region with a slow response can be made to respond first, and, as a result, the whole pixel can be made to respond at high speed uniformly.
[0029]
Other aspects of the invention are:
A display device having at least means for applying an electric field to a partial region of liquid crystal,
The means is
First, an electric field is applied to a region that is 1/2 or more of the region in contact with the periphery of the partial region,
Then, it has a function of applying an electric field to another region.
[0030]
Other aspects of the invention are:
A display device having at least means for applying an electric field to a predetermined region of liquid crystal,
The means is
It has a function of sequentially applying an electric field from at least a part of the region in contact with the periphery of the predetermined region to the central portion and / or the central peripheral portion of the predetermined region.
[0031]
Other aspects of the invention are:
A display device having at least means for applying an electric field to a predetermined region of liquid crystal,
The means is
It has a function of applying an electric field to the central portion of the predetermined region and / or the central peripheral portion after applying an electric field to at least a part of the region in contact with the periphery of the predetermined region.
[0032]
As a specific example of the above configuration, 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 an electric field at the center of the predetermined region. The structure which has the center pixel electrode 101 for adding can be mentioned. By adopting such a configuration, the liquid crystal can be made to respond sequentially from the periphery to the center of the predetermined area of the liquid crystal that becomes the pixel area, and the response delay due to the influence of the liquid crystal around the pixel area is corrected. can do.
[0033]
Further, the invention disclosed in this specification is characterized in that the peripheral pixel electrode is formed in a different plane from the central pixel electrode. By adopting such a configuration, an electric field can be more easily applied to the peripheral region of the central pixel electrode.
[0034]
In order to solve the above-described problems, other main configurations of the invention disclosed in this specification are as follows:
A signal line and a scanning line are crossed in a matrix on a transparent substrate, a thin film transistor and a transparent pixel electrode are arranged at the crossing portion, a liquid crystal material is sandwiched between the transparent substrate different from the transparent substrate, and the liquid crystal In an active matrix liquid crystal display device in which a voltage is applied to a material to perform display, a transparent pixel electrode is a first pixel electrode and a first pixel electrode which are located at substantially the center of a pixel region surrounded by scanning lines and signal lines. 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 different signal lines. The first pixel electrode and the second pixel electrode are connected to a scanning line, and are formed on different planes.
[0035]
Furthermore, another configuration of the present invention is as follows:
A transparent pixel electrode arranged in a matrix on a transparent substrate, wherein the transparent pixel electrode is a first pixel electrode and a first pixel located substantially in the center of a pixel region surrounded by scanning lines and signal lines; The second pixel electrode has a shape surrounding the electrode, and 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 different signal lines. In an active matrix liquid crystal display device connected to a scanning line and formed on a different plane from the first pixel electrode and the second pixel electrode, an input image signal is delayed by a frame memory Compare with the original signal, detect the moving part, and when the moving part is detected, move the second thin film transistor one frame or more ahead of driving the first thin film transistor. And drives using image signals.
[0036]
FIG. 6 is a specific configuration diagram of the above invention, and is a configuration diagram of a pixel cell in an active matrix liquid crystal display device. FIG. 6A shows a top view of the pixel, and FIG. It is sectional drawing cut | disconnected by line aa 'of 6 (a). 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 602 is a central pixel electrode as a second pixel electrode. It is provided so as to contact the periphery of 601 and surround its four sides. A pixel thin film transistor 603 is connected to the central pixel electrode 601, and a thin film transistor 604 is connected to the peripheral pixel electrode 602.
[0037]
Further, scanning lines 605 and 606 and signal lines 607 and 608 are independently connected to the thin film transistors 603 and 604, respectively. Further, driving circuits (not shown) are independently connected to the scanning lines 605 and 606 and the signal lines 607 and 608, respectively. Therefore, the central pixel electrode 601 and the peripheral pixel electrode 602 can be operated at different timings by different driving circuits.
[0038]
In addition, as shown in FIG. 6B, the peripheral pixel electrode 602 is disposed below the central pixel electrode 601, and a layer in which the central pixel electrode 601 is formed and a layer in which the peripheral pixel electrode 602 is formed. In between, SiN, Al ₂ O _Three An insulating film layer 609 is formed.
[0039]
By disposing the peripheral pixel electrode 602 in a different layer from the central pixel electrode 601, wirings connected to the respective electrodes can be provided in the electrically insulated layer. For example, since a wiring pattern connected to the central pixel electrode 601 can be formed over the insulating film 609, the wiring pattern can be disposed across the peripheral pixel electrode 602. Therefore, the peripheral pixel electrode 602 can be disposed so as to surround the entire periphery of the central pixel electrode 601.
[0040]
Further, as shown in FIG. 6B, the central pixel electrode 601 and the peripheral pixel electrode 602 overlap with each other at the periphery of the central pixel electrode 601. Since such a configuration is adopted, a voltage can be applied to the peripheral portion of the central pixel electrode 601 by the peripheral pixel electrode 602. Further, since the central pixel electrode 601 and the peripheral pixel electrode 602 partially overlap, it is possible to compensate for a shift in alignment in the process. For this reason, the process margin can be increased.
[0041]
As a specific operation, a voltage is applied between the peripheral pixel electrodes 602 before a voltage is applied to the central pixel electrode 601. Then, the liquid crystal molecules sandwiched between the peripheral pixel electrodes 602 are aligned so 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 are aligned in the initial alignment state. To change along the lines of electric force. For convenience, this is referred to as the first response.
[0042]
Next, a voltage is also applied to the central pixel electrode 601 at a timing delayed by a predetermined time. As a result, the liquid crystal molecules sandwiched between the central pixel electrodes 601 are aligned so that the direction of the major axis is parallel to the lines of electric force. For convenience, this is referred to as a second response.
[0043]
In the second response, since the liquid crystal molecules at the periphery of the central pixel electrode 601 have already responded by the voltage application from the peripheral pixel electrode 602, the liquid crystal molecules between the central pixel electrodes 601 are delayed regardless of the position. Therefore, a uniform response can be obtained over the entire area of the central pixel electrode.
[0044]
Time T required for the first response ₁ And time T required for the second response ₂ The relationship with T ₁ > T ₂ It becomes. This is because in the first response, the liquid crystal molecules sandwiched between 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 = ΔT. In the present invention, the time difference from when a voltage is applied to the peripheral pixel electrode 602 to when the voltage is applied to the central pixel electrode 601 is set to ΔT. Thereby, it is 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. Such an operating state is very useful for making a change in color tone and a motion of a moving image natural in displaying a moving image.
[0045]
Note that chromium can also be used for the surrounding pixel electrode 602 as a black matrix. Thereby, there is an advantage that the disorder of alignment of liquid crystal molecules in the pixel peripheral region can be shielded.
[0046]
Other aspects of the invention are:
A liquid crystal display device having a pixel region in which a plurality of pixel electrodes are arranged,
In the pixel region,
A first pixel electrode occupying a central region of the pixel region;
A second pixel electrode formed surrounding the entire periphery of the first pixel electrode;
It is characterized by having.
[0047]
In the above configuration, the pixel region refers to a region where one unit of display is arranged in a matrix, for example. For example, in the case of the configuration shown in FIG. 6, a region formed by the peripheral pixel electrode 602 and the central pixel electrode 601 is a pixel region.
[0048]
Other aspects of the invention are:
A liquid crystal display device having a pixel region in which a plurality of pixel electrodes are arranged,
In the pixel region,
A first pixel electrode occupying a central region of the pixel region;
A second pixel electrode disposed surrounding at least a part of the periphery of the first pixel electrode;
Have
The first pixel electrode and the second pixel electrode are formed on different planes.
[0049]
In the above structure, the first pixel electrode and the second pixel electrode are formed on different planes, and in particular, an edge portion of the first pixel electrode and a part of the second pixel electrode overlap with each other. To do.
[0050]
As a specific configuration, the configuration shown in FIG. 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.
[0051]
In the invention disclosed in this specification, a peripheral driver circuit for driving a pixel is preferably formed using a polysilicon thin film transistor. Constructing the peripheral drive circuit with a polysilicon thin film transistor has the following advantages.
[0052]
1. The pixel pitch of the active matrix can be reduced.
In the case of driving an active matrix using TAB, the pitch of TAB cannot be reduced because the pitch of TAB is limited to a size that can be attached to a glass substrate.
When the drive circuit is built in the substrate, since there is no bonding with the active matrix, the matrix pitch can be reduced.
[0053]
2. The reliability of wiring connection can be improved.
When TAB is used, thousands of wires are output from the active matrix to the outside. Therefore, there is a high probability of disconnection at the connection point of the TAB-active matrix substrate. The number of terminals coming out of the matrix substrate is about one-hundredth, and improvement in reliability can be expected.
[0054]
3. The size of the display device can be reduced.
When a TAB is used, a display device having a small screen size, such as a viewfinder, has a larger TAB of the drive circuit than an active matrix, which has been a drag on the volume reduction of a video camera or the like. In the case of a built-in drive circuit, the circuit width can be suppressed to 5 mm or less, which can contribute to downsizing of a display device such as a viewfinder.
[0055]
[Action]
In 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 a portion where “movement” is required on the screen, and the central pixel electrode is driven. Sometimes the liquid crystal material is made to respond easily to the applied voltage. In other words, the liquid crystal in the area in contact with the periphery of the pixel, which takes time to respond, is made to respond first, and then the liquid crystal in the center area of the pixel is made to respond, so that the liquid crystal in the pixel responds almost simultaneously at high speed. I have to.
[0056]
Further, in the invention disclosed in this specification, when a motion part is detected by delaying an image signal by a frame memory and comparing the image signal data before and after the delay, 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 the moving image is accurately displayed.
[0057]
【Example】
Embodiment 1 FIG. 1 is a configuration diagram of one pixel cell of an active matrix liquid crystal display device using the invention disclosed in this specification. Conventionally, a pixel electrode constituted by one pixel is divided into a central pixel electrode and a surrounding pixel electrode in this embodiment.
[0058]
FIG. 1 is a specific configuration diagram of a display device having the above configuration, and shows only one pixel cell serving as a display unit. The signal lines 107 and 108 and the scanning lines 105 and 106 are arranged in a lattice shape, and a central pixel electrode 101 made of a transparent electrode is disposed at the center of the lattice portion. A peripheral pixel electrode 102 made of a letter-shaped transparent electrode is disposed. Therefore, the peripheral pixel electrode 102 surrounds approximately 3/4 of the periphery of the central pixel electrode 101. 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. Drive circuits (not shown) are independently connected to the scanning lines 105 and 106 and the signal lines 107 and 108, respectively.
[0059]
FIG. 2 is a cross-sectional configuration diagram of a pixel cell, in which a central pixel electrode 101 and a peripheral pixel electrode 102 are formed on a transparent substrate 110. On the other transparent substrate 111, a central pixel electrode 112 facing the central pixel electrode 101 and a peripheral pixel electrode 113 facing the peripheral pixel electrode 102 are formed. A liquid crystal 114 is sealed between the transparent substrates 110 and 111.
[0060]
When the screen to be displayed by the pixel cell is a still image, a conventional driving method may be employed, and the central pixel electrode 101 plays the same role as the conventional pixel electrode to perform screen display.
[0061]
When displaying a moving image, the central pixel electrode 101 and the peripheral pixel electrode 102 are driven at different timings in order to improve the operation speed of the boundary surface (the portion in contact with the periphery) of the central pixel electrode 101, and the moving image is accurately displayed. To do. First, a voltage is applied only by the peripheral pixel electrodes 102 and 113. FIG. 2B shows the state of the electric lines of force 115 when an electric field is applied only to the peripheral pixel electrodes 102 and 113.
[0062]
As shown in FIG. 2B, the electric lines of force 114 also act outside the peripheral pixel region, so that the liquid crystal molecules 114 sandwiched between the peripheral pixel electrodes 102 and 111 respond and the central pixel electrode 101, The liquid crystal molecules 114 at the peripheral edge of 112 can also respond in advance to change their orientation.
[0063]
Then, an electric field is applied to the liquid crystal molecules 114 sandwiched between the central pixel electrodes 101112 by the central pixel electrodes 101 and 112. The liquid crystal molecules 114 in this state are shown in FIG. In this state, since the liquid crystal molecules at the periphery of the central pixel electrodes 101 and 112 have responded 114 in advance, without being affected by the liquid crystal molecules 114 in the region where the electrodes 101, 102, 112, and 113 are not arranged, The liquid crystal molecules 114 between the central pixel electrodes 101 and 112 can respond smoothly.
[0064]
In this embodiment, the central pixel electrodes 101 and 112 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 a pair of pixel electrodes, electric lines of force 115 protrude from the boundary surface of the pixels. As a result, the liquid crystal molecules 114 outside the boundary surface between the peripheral pixel electrodes 102 and 113 can also respond.
[0065]
FIG. 3 shows the result of measuring the position of the liquid crystal molecules in response to the applied voltage as the separation distance from the electrode. For a voltage application of 5V, the separation distance is about 4 μm. This means that when a voltage of 5 V is applied, the direction 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 within 4 μm. In order to form a separation distance of 4 μm, it is sufficiently possible in consideration of the photolithography resolution of the current liquid crystal display device.
[0066]
[Embodiment 2] This embodiment shows a driving method of a pixel matrix whose display unit is composed of two pixel electrodes. In this embodiment, the pixel electrode has the same configuration as that of 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 serving as switching elements to each of them, and to connect the driving circuits to these thin film transistors.
[0067]
In general, the peripheral driving circuit includes a signal line driving circuit and a scanning line driving circuit. These signal line driver circuit and 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 in the central pixel region and the peripheral pixel region are arranged. Therefore, two or more signal line driving circuits and two or more scanning line driving circuits are required. .
[0068]
FIG. 4 is a schematic configuration diagram of the liquid crystal display device of this embodiment. As shown in FIG. 4A, the pixel matrix 401 includes pixel cells including the central pixel electrode and the peripheral pixel electrode shown in FIGS. In order to control the thin film transistor connected to the central pixel electrode, a signal line driving circuit 402 and a scanning line driving circuit 404 are connected to the pixel matrix 401 by signal lines and scanning lines, respectively. Further, in order to control the thin film transistors connected to the peripheral pixel electrodes, a signal line driver circuit 403 and a scanning line driver circuit 605 are connected to the pixel matrix 401 by signal lines and scanning lines, respectively. The output of the motion detection circuit 406 is connected to the signal line drive circuits 402 and 403, respectively.
[0069]
The signal line driver circuits 402 and 403 and the scanning line driver circuits 404 and 405 are arranged so as to surround the four sides of the pixel matrix 401, and the signal line driver circuits 402 and 403 face each other across the pixel matrix 401. The scanning line driving circuits 404 and 405 are opposed to each other. FIG. 4B is a modified example of the arrangement of the peripheral drive circuits, and the same reference numerals as those in FIG. 4A indicate the same members. As shown in FIG. 4B, signal line driving circuits 402 and 403, scanning line driving circuits 404 and 405 are arranged so as to surround two sides of the pixel matrix 401, and the signal line driving circuits 402 and 403, and Scan line driving circuits 404 and 405 are arranged on the same side. However, the signal line driver circuits 402 and 403 and the scanning line driving circuits 404 and 405 do not share the signal line and the scanning line, respectively.
[0070]
FIG. 5 is a block diagram of a system for supplying display signals to the signal line driver 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. It is. As shown in FIG. 5, an image signal is input to the frame memory 407 and the motion detection circuit 406 from the outside. The output of the frame memory 407 is connected to the motion detection circuit 406, the signal line driver circuit 403, and the frame memory 408, and the output of the frame memory 408 is connected to the signal line driver circuit 402.
[0071]
An image signal is input from the outside 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, new image data is input from the outside to the frame memory 407, and the stored image data is updated. That is, since the frame memory 407 updates the image data every time it outputs the image data to the frame memory 408, the image data stored in the frame memory 407 is 1 more than the image data stored in the frame memory 408. It becomes the data of the frame destination.
[0072]
The motion detection circuit 406 receives an image signal from the outside and image data stored in the frame memory 407. In the motion detection circuit 406, it is determined whether or not the “motion” component is present 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 from the image signal input from the outside. ”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 the “motion” appears.
[0073]
When the difference signal does not indicate “motion”, a drive signal is output from the motion detection signal 406 to the signal line driver circuit 402, and the signal line driver circuit 402 receives the drive signal via the signal line. Then, the thin film transistor is driven, and image data is written to the central pixel electrode in the same manner as the conventional pixel electrode.
[0074]
When the difference signal indicates “motion”, a drive signal is output from the motion detection signal 406 to the signal line driver 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 driver circuit 402 and written to the central pixel. The image data of the same frame is displayed on the pixel.
[0075]
As described above, by storing image data in the two frame memories 407 and 408, the image data to be written to the central pixel is delayed, and the timing to write the image data to the peripheral pixel is one frame ahead of the central pixel. Therefore, substantially no difference in response between the central portion and the peripheral portion occurs, and the moving image can be displayed accurately.
[0076]
In the example of FIG. 6, digital signal processing is assumed. However, when the image signal is analog, when the image signal is input to the frame memories 407 and 408, it is converted to a digital signal by an AD converter. The output signals from the signal line driver circuits 402 and 403 may be converted to analog signals by a DA converter and output to the pixel matrix.
[0077]
[Embodiment 3] This embodiment is a modification of Embodiment 1, 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 liquid crystal material having a nematic property 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 line aa 'of Fig.6 (a). FIG. 7 is a cross-sectional configuration diagram of a pixel cell.
[0078]
As shown in FIG. 6A, a central pixel electrode 601 corresponding to a conventional pixel is provided. A peripheral pixel electrode 602 is provided in contact with the periphery of the central pixel electrode 601 so as to surround the periphery. A pixel thin film transistor 603 is connected to the central pixel electrode 601, and a pixel thin film transistor 604 is connected to the peripheral pixel electrode 602. Scan 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. The scanning lines 605 and 606 and the signal lines 607 and 608 are independently connected to drive circuits (not shown).
[0079]
Further, as shown in FIG. 6B, the peripheral pixel electrode 602 is disposed below the central pixel electrode 601, and a layer in which the central pixel electrode 601 is formed and a layer in which the peripheral pixel electrode 162 is formed. An insulating film layer 609 is formed therebetween.
[0080]
A method for manufacturing an active matrix panel of a liquid crystal display device will be described below. As the first transparent substrate 610, a # 7059 glass substrate (thickness 1.1 mm) or a # 1713 glass substrate (thickness 1.1 mm) manufactured by Corning Corporation is used. A thin film transistor, a peripheral pixel electrode, and a central pixel electrode for driving the pixel electrode are formed on the transparent substrate 610, respectively. The required number of pixels is formed in a matrix.
[0081]
The peripheral pixel electrode 602 is formed by forming a chromium film with a thickness of 1000 mm on the transparent substrate 610 and performing patterning by a normal sputtering method. The peripheral pixel electrode 602 also functions as a black matrix. A wiring pattern (not shown) for connecting the peripheral pixel electrode 602 and the thin film transistor 604 is formed at the same time before or after the formation of the peripheral pixel electrode 602.
[0082]
An insulating film 609 is formed on the peripheral pixel electrode 602 by patterning an aluminum oxide film by sputtering. Note that the insulating film 609 may be formed of silicon nitride. Further, an ITO film having a thickness of 1000 mm is formed on the insulating film 609 by sputtering. The central pixel electrode 601 is formed by patterning the ITO film. A wiring pattern for connecting the central pixel electrode 601 and the thin film transistor 603 is formed at the same time before or after the formation of the central pixel electrode 601.
[0083]
What is important here is that a wiring connecting the central pixel electrode 601 and the thin film transistor 603 is formed over the insulating film 609, and a wiring connecting the peripheral pixel electrode 602 and the thin film transistor 604 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 partially overlapped, or the peripheral pixel electrode 602 can be disposed so as to surround the entire periphery of the central pixel electrode 601. . Although not described in detail here, a peripheral drive circuit region and the like are formed on the first transparent substrate 610 using thin film transistors.
[0084]
Further, as the second transparent substrate 602, a Corning # 7059 (thickness 1.1 mm) or # 1737 (thickness 1.1 mm) 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.
[0085]
A 1000-mm-thick chromium film is formed on the transparent substrate 611 by a sputtering method. Then, patterning is performed to form a peripheral pixel electrode 612 that faces the peripheral pixel electrode 602. The peripheral pixel electrode 612 also functions as a black matrix. Next, an aluminum oxide film is formed over 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 mm is formed on the insulating film 613 by sputtering. The ITO film is patterned to form a center pixel electrode 614 as a counter electrode to the center pixel electrode 601. The central pixel electrode 614 may be formed on the entire surface without patterning. Through the above process, a pair of translucent substrates constituting the liquid crystal display device is completed.
[0086]
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. As the alignment film, a polyimide resin is formed and rubbed. In this embodiment, since the TN type is used, the rubbing direction is set to be orthogonal between the transparent substrates 610 and 611.
[0087]
Then, the transparent substrates 610 and 611 are attached to each other with an epoxy adhesive at a predetermined interval. At this time, the distance between the transparent substrates 610 and 611 is controlled by 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. For example, a vacuum injection method may be used as the injection method.
[0088]
When displaying a still image, the central pixel electrodes 601 and 614 may be driven as in the conventional example. The center pixel electrodes 601 and 614 play the same role as the conventional pixel electrodes to display a screen.
[0089]
When displaying a moving image, two types of pixel electrodes are operated at different timings to improve display speed. Therefore, a voltage is applied from the peripheral pixel electrode, and a voltage is applied from the central pixel electrode with a predetermined timing delay.
[0090]
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. 7A shows a state of the electric force lines 615. FIG. 7B shows the state of the liquid crystal molecules 616.
[0091]
A voltage is applied between the peripheral pixel electrodes 602 and 612 before a voltage is applied to the central pixel electrodes 601 and 614. For this reason, 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 major axis follows the direction of the electric force lines 615. Next, a voltage is also applied to the central pixel electrodes 601 and 614 at a slightly delayed timing. In a state where a voltage is applied between the central pixel electrodes 601 and 614, the liquid crystal molecules at the periphery of the central pixel region respond to the voltage already applied from the peripheral pixel electrodes 602 and 612. Therefore, the response of the liquid crystal molecules to the voltage by the central pixel electrodes 601 and 614 can be made uniform in the entire region of the central pixel without causing the liquid crystal in the peripheral region to be delayed.
[0092]
In this embodiment, the peripheral pixel electrodes 602 and 612 are made of chrome which also serves as a black matrix. Therefore, even if the peripheral pixel electrodes 602 and 612 are operated at timings different from those of the central pixel electrodes 601 and 614, the liquid crystal in the pixel peripheral region is used. The advantage of being able to shield molecular orientation disturbances arises. In addition, in order to drive the pixel cell shown in FIGS. 6 and 7, the driving circuit of Embodiment 2 can be used.
[0093]
Note that the configuration shown in FIG. 8 can be employed as long as the central pixel electrode and the peripheral pixel electrode can be operated independently. In FIG. 8, the same reference numerals as those in FIG. 6 represent the same members. As shown in FIG. 8, a pixel thin film transistor 603 is connected to the central pixel electrode 601, and a pixel thin film transistor 104 is connected to the peripheral pixel electrode 102. The gate electrodes of these thin film transistors are connected to the same scanning line 605, while the source electrodes are connected to different signal lines 607 and 608, respectively.
[0094]
By adopting the configuration shown in FIG. 8, the arrangement of the thin film transistors 603 and 604 becomes simpler than the configuration shown in FIG. 6, and the required number of scanning lines can be halved with the same number of pixels. The aperture ratio can also be improved.
[0095]
Further, since the thin film transistors 603 and 604 are connected to the common scanning line 605, it is sufficient to provide one scanning line driving circuit in the peripheral circuit for driving the pixels as in the conventional example. For example, FIG. Corresponding to (a), the configuration shown in FIG. 9 can be adopted.
[0096]
As shown in FIG. 9, two signal line driver circuits 902 and 903 and a scanning line driver circuit 904 are connected to the pixel matrix 901 so as to surround three sides of the pixel matrix, and the signal line driver circuits 902 and 903 are connected. A motion detection circuit 906 is connected to each. Although the scanning line driver circuit 904 is common, since the signal line driver circuits 902 and 903 are provided independently, different image signals can be input to the central pixel electrode 601 and 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, so that Both images and videos can be displayed well.
[0097]
【effect】
In the present invention, when a pixel is divided into two regions, a central pixel and a peripheral pixel, and a high-speed operation is required for the screen, the peripheral pixel is operated in advance before the central pixel. It has the effect of improving the operating speed. Therefore, the operation speed of the liquid crystal display device can be improved, and a higher quality display can be provided to the user.
[Brief description of the drawings]
1 is a top view of a pixel cell of Example 1. FIG.
FIG. 2 is a cross-sectional configuration diagram of a pixel cell, FIG. 2 (a) is a schematic diagram for explaining the response of liquid crystal, and FIG. 2 (b) is a schematic diagram of lines of electric force.
FIG. 3 is a graph showing the relationship between the distance from an electrode of a responsive liquid crystal molecule to the applied voltage.
4 is a schematic diagram of an active matrix liquid crystal display device according to Embodiment 2. FIG.
FIG. 5 is a block circuit diagram of a motion detection system.
6 is a top view of a pixel electrode in Example 3. FIG.
7 is a cross-sectional configuration diagram of a pixel electrode, FIG. 7A is a schematic diagram of lines of electric force, and FIG. 7B is a schematic diagram illustrating a response of liquid crystal molecules.
8 is a top view of a pixel electrode according to a modification of Example 3. FIG.
FIG. 9 is a schematic view of an active matrix liquid crystal display device.
FIG. 10 is a schematic configuration diagram of a conventional active matrix 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 graph showing transmittance-applied voltage characteristics of 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]
Center pixel electrode: 101, 112, 601, 614
Peripheral pixel electrodes: 102, 113, 602, 612
Thin film transistor: 103, 104, 603, 604
Scan line: 105, 106, 605, 606
Signal line: 107, 108, 607, 608
Transparent substrate: 110, 111, 610, 611
Signal line driver circuit: 402, 403, 902, 903
Scan line driving circuit: 404, 405, 904
Motion detection circuit: 406, 906
Frame memory: 407, 408
Insulating film: 609, 613

Claims (10)

A signal line and a scanning line are crossed on a light-transmitting substrate, and a first thin film transistor, a second thin film transistor, a first pixel electrode, and a second pixel electrode are arranged at the crossing portion. In an active matrix type liquid crystal display device,
The second pixel electrode has a shape surrounding at least two sides of the first pixel electrode,
The first pixel electrode is connected to the first thin film transistor;
The second pixel electrode is connected to the second thin film transistor;
The liquid crystal display device, wherein the first thin film transistor and the second thin film transistor are respectively connected to different signal lines. A signal line and a scanning line are crossed on a light-transmitting substrate, and a first thin film transistor, a second thin film transistor, a first pixel electrode, and a second pixel electrode are arranged at the crossing portion. In an active matrix type liquid crystal display device,
The second pixel electrode has a shape surrounding at least two sides of the first pixel electrode,
The first pixel electrode is connected to the first thin film transistor;
The second pixel electrode is connected to the second thin film transistor;
The liquid crystal display device, wherein the first thin film transistor and the second thin film transistor are connected to different signal lines and different scanning lines, respectively. A signal line and a scanning line are crossed on a light-transmitting substrate, and a first thin film transistor, a second thin film transistor, a first pixel electrode, and a second pixel electrode are arranged at the crossing portion. In an active matrix type liquid crystal display device,
The second pixel electrode has a shape surrounding at least two sides of the first pixel electrode,
The first pixel electrode is connected to the first thin film transistor;
The second pixel electrode is connected to the second thin film transistor;
The first thin film transistor and the second thin film transistor are respectively connected to different signal lines,
The liquid crystal display device, wherein the first pixel electrode and the second pixel electrode are formed on different planes. A signal line and a scanning line are crossed on a light-transmitting substrate, and a first thin film transistor, a second thin film transistor, a first pixel electrode, and a second pixel electrode are arranged at the crossing portion. In an active matrix type liquid crystal display device,
The second pixel electrode has a shape surrounding at least two sides of the first pixel electrode,
The first pixel electrode is connected to the first thin film transistor;
The second pixel electrode is connected to the second thin film transistor;
The first thin film transistor and the second thin film transistor are connected to the different signal lines and the different scanning lines, respectively.
The liquid crystal display device, wherein the first pixel electrode and the second pixel electrode are formed on different planes. A signal line and a scanning line are crossed in a matrix on the first transparent substrate, and a first thin film transistor, a second thin film transistor, a first transparent pixel electrode, and a second transparent pixel electrode are crossed at the intersection. In an active matrix liquid crystal display device in which a liquid crystal material is sandwiched between the first transparent substrate and the second transparent substrate,
The second transparent pixel electrode has a shape surrounding at least two sides of the first transparent pixel electrode,
The first transparent pixel electrode is connected to the first thin film transistor;
The second transparent pixel electrode is connected to the second thin film transistor;
The liquid crystal display device, wherein the first thin film transistor and the second thin film transistor are connected to different signal lines and different scanning lines, respectively. A signal line and a scanning line are crossed in a matrix on the first transparent substrate, and a first thin film transistor, a second thin film transistor, a first transparent pixel electrode, and a second transparent pixel electrode are formed at the intersection. In an active matrix liquid crystal display device in which a liquid crystal material is sandwiched between the first transparent substrate and the second transparent substrate,
The second transparent pixel electrode has a shape surrounding at least two sides of the first transparent pixel electrode,
The first transparent pixel electrode is connected to the first thin film transistor;
The second transparent pixel electrode is connected to the second thin film transistor;
The first transparent pixel electrode and the second transparent pixel electrode are connected to the first thin film transistor and the second thin film transistor, respectively.
The first thin film transistor and the second thin film transistor are connected to the different scanning lines and the different signal lines, respectively.
The liquid crystal display device, wherein the first transparent pixel electrode and the second transparent pixel electrode are formed on different planes.   7. The method according to claim 2, wherein the first thin film transistor and the second thin film transistor are connected to the first driving circuit and the second driving circuit through the signal line and the scanning line. Accordingly, the liquid crystal display device is driven at different timings.   8. The method according to claim 7, wherein the first driving circuit is driven by an image signal having a natural number of times longer than at least one frame period than the image signal for driving the second driving circuit. A characteristic liquid crystal display device.   8. The liquid crystal display device according to claim 7, wherein the second driving circuit operates only when the image signal includes a motion component. Having transparent pixel electrodes arranged in a matrix on a transparent substrate;
The transparent pixel electrode includes a first pixel electrode and a second pixel electrode having a shape surrounding at least two sides of the first pixel electrode in a pixel region surrounded by scanning lines and signal lines.
The first pixel electrode is connected to the first thin film transistor;
The second pixel electrode is connected to the second thin film transistor;
In the liquid crystal display device in which the first thin film transistor and the second thin film transistor are connected to the different signal lines and the different scanning lines, respectively.
The input image signal is delayed by the frame memory, compared with the original signal, the motion part is detected by the motion detection circuit, and when the motion part is detected, the second thin film transistor is replaced with the first thin film transistor. A driving method of a liquid crystal display device, characterized in that driving is performed using an image signal that is one frame or more before driving.

Images