JP3249399B2 - Liquid crystal display device and liquid crystal driving method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device mounted on a word processor, a personal computer or the like.

[0002]

2. Description of the Related Art Conventionally, a liquid crystal display of a 10-inch size word processor or a personal computer has a standard number of pixels of 640 pixels vertically and 480 pixels horizontally. Recent word processors and personal computers are full of software. In particular, the use of Windows has become widespread in personal computers. For this reason, at present, it is necessary to simultaneously process a plurality of pieces of software and a lot of information on a screen, and accordingly, a demand for a larger capacity and higher definition of a liquid crystal display device is increasing.

As display screens having the number of pixels corresponding to these requirements, there are an SVGA type with 800 columns and 600 columns and an XGA type with 1024 columns and 768 columns. Further, a large capacity, high definition SXGA type has been commercialized. In the case of color display, the number of the vertical electrodes is required to be three times as large as the above-mentioned number in order to make the three colors red, green and blue. For example, 1920 for the VGA type, 2400 for the SVGA type, XG
The A type has 3072 vertical electrodes.

[0004] In the case of a simple matrix driving panel, the display electrodes are patterned into striped electrodes.
At the time of image display, the electrode driving signal is applied to the horizontal electrodes by a line-sequential scanning method. For example, when there are 480 horizontal electrodes, the voltage is applied at 1/480 duty. A selection signal or a non-selection signal is applied to the vertical electrode in accordance with the timing of the application signal of the horizontal electrode.

In a VGA type liquid crystal display panel, 480 horizontal electrodes are denoted by m1 to m480, and 1920 vertical electrodes are denoted by n.
In the case of 1 to n1920, if a signal voltage is applied only to m240 and n960, the liquid crystal in the display area (selection point) of the cross point between m240 and n960 responds. However, since the liquid crystal material is a dielectric, a so-called crosstalk phenomenon occurs in which liquid crystals in other display regions (non-selected points) also make a weak response.

In order to avoid the crosstalk phenomenon,
Usually, a driving method called a voltage averaging method is used. The voltage averaging method applies a selection voltage to a selected point and a non-selection voltage to a non-selection point to reduce the voltage applied to a non-selection display area to a voltage value required for liquid crystal response or less. It is a driving method. The selection voltage and the non-selection voltage are set in advance.

The optimum effective value ratio between the selection voltage and the non-selection voltage when driving at 1/480 duty is theoretically 1.0.
It becomes 47.

Although the ratio between the selection voltage and the non-selection voltage decreases as the number of pixels increases due to the increase in capacity and definition,
When this ratio decreases, the execution voltage at the time of selection also decreases, so that the response of the liquid crystal at the time of selection becomes insufficient and the contrast decreases.

As a method of driving the current VGA screen, two-screen drive and one-screen drive are widely used. 2
The screen drive means that the screen is divided into a first screen and a second screen in the horizontal direction (m1 to m240 of the horizontal electrode and n1 to n1 of the vertical electrode).
920 is the first screen, horizontal electrodes m241 to m480 and n ′
1 to n ′ 1920 as a second screen), and the first screen and the second screen are driven in parallel. In one-screen driving, a signal voltage is applied to the horizontal electrodes at 1/480 duty, whereas in two-screen driving, 1/24 duty is applied.
A signal voltage is applied at 0 duty. Conventionally, it has been devised to increase the effective voltage value ratio to achieve high contrast by the two-screen driving.

FIG. 7 is a simplified diagram showing a vertical electrode structure in the case of performing a conventional two-screen drive. As shown in the figure, the vertical electrodes are composed of n1 to n1920 and n′1.
Ｎn ′ 1920 is electrically separated into two parts. When performing two-screen driving, n1 to n1920
As the first screen, and n′1 to n′1920 as the second screen,
The electrodes are driven in parallel while applying a signal electrode to each electrode.

Table 1 below shows the relationship between the duty and the effective voltage ratio between the selection voltage and the non-selection voltage.

[0012]

[Table 1]

[0013]

However, in the liquid crystal display device as described above, as shown in Table 1, it can be seen that the effective voltage value ratio decreases as the display screen increases in capacity. In this case, there is a problem that a sufficient contrast cannot be secured because the effective voltage value ratio is reduced to 1.060 or less even in two-screen driving. The present invention has been made to solve the above problem, and has a multi-layered electrode structure on a substrate to increase a duty ratio, increase an effective voltage value ratio between a selection voltage and a non-selection voltage, and increase the capacity of a screen display. It is an object of the present invention to provide a liquid crystal display device and a liquid crystal driving method capable of obtaining a sufficient display contrast with respect to the following.

[0014]

In order to achieve the above object, a first liquid crystal display device of the present invention is a liquid crystal display device having an upper substrate and a lower substrate, wherein A single layer formed of a first stripe electrode formed on one substrate and a second stripe electrode arranged on the other substrate so as to be orthogonal to each of the first stripe electrodes. An electrode portion, and on the one substrate, a single-layer electrode portion formed by a single layer of the first stripe electrode and an electrical insulating layer formed on the first stripe electrode. stripe electrode and a multilayer electrode portion formed on the multilayer, the in the multilayer electrode part
The first stripe electrode is a first stripe electrode in the single-layer electrode portion.
And the first stripe
Separated in a direction perpendicular to the electrodes,
Striped electrodes are each connected to one of the first struts.
Having overlapping portions with the electrode and the electrical insulating layer.
A signal voltage is applied to the second stripe electrode by a line-sequential scan method, and a signal voltage is applied to the stripe electrode on the first substrate in accordance with the timing of the applied signal of the second stripe electrode. , A selection signal and a non-selection signal are applied. In the first liquid crystal display device, it is preferable that the stripe electrode of the multilayer electrode portion has two layers.

According to the above-described configuration, it is possible to drive four screens or to drive a plurality of screens of four or more screens. Therefore, a display screen of a large capacity pixel such as an SVGA type, an XGA type or an SXGA type is provided. Also, when the screen is driven, the effective voltage ratio between the selection voltage and the non-selection voltage can be increased, so that the contrast can be maintained and the flicker phenomenon can be reduced.

Further, in the first liquid crystal display device, it is preferable that a signal supply LSI chip is mounted on a terminal of the stripe electrode of the multilayer electrode portion. According to the configuration described above, signals can be supplied by an LSI chip even in a liquid crystal display device having a multilayer electrode unit.

When the signal supply LSI chip is mounted, it is preferable that the film thickness of the portion corresponding to the display region of the electrically insulating layer is smaller than the film thickness of the portion corresponding to the electrode terminals. According to the configuration described above, the thickness of the electrode terminal portion is larger than the thickness of the portion corresponding to the display region, and therefore, it is possible to prevent the electrical insulating layer from being damaged when the LSI is mounted on the electrode terminal portion. it can.

In the first liquid crystal display device, it is preferable that the stripe electrode on one substrate is a metal reflective electrode and the stripe electrode on the other substrate is a transparent electrode. According to the above configuration, a reflection type liquid crystal display panel can be manufactured even in a liquid crystal display device having a multilayer electrode portion.

Further, in the first liquid crystal display device, it is preferable that an electrode terminal to which a signal can be applied is provided at each end of one layer of the stripe electrode on one substrate. According to the above configuration, since the scanning signal can be applied from both sides, the potential gradient at both ends of the electrode can be reduced, and the display unevenness can be reduced.

Further, in the first liquid crystal display device, the multilayer electrode portion is a flat stripe electrode of the uppermost layer portion and a stripe electrode composed of an upper electrode and a lower electrode by a step portion is an electric insulating layer. It is preferable to be formed by laminating through. In the case where the multi-layer electrode portion has two electrodes, the multi-layer electrode portion has a flat stripe electrode of the uppermost layer portion, and a lower electrode of a stripe electrode composed of an upper electrode and a lower electrode by a step portion. Is preferably formed by lamination via an electric insulating layer. Further, in the case of the structure in which the step portion is provided in the stripe electrode as described above, it is preferable that the surface of the uppermost layer electrode and the surface of each of the upper electrodes are on the same plane.

According to the above configuration, the height of the surface of the upper electrode can be adjusted by changing the size of the step portion of the electrode and the thickness of the electrical insulating layer. If the position in the height direction of the surface of the upper electrode is made closer to the position in the height direction of the surface of the planar electrode in the uppermost layer, the difference in the electric field strength is reduced, and display unevenness can be reduced. In particular, when the positions of the surface of the upper electrode and the uppermost vertical electrode in the height direction are the same, there is no difference in the electric field intensity, so that the effect of reducing display unevenness is great.

Next, a first liquid crystal driving method according to the present invention comprises an upper substrate, a lower substrate, a first stripe electrode formed on one of the upper and lower substrates, and a second stripe electrode formed on the other substrate. A single-layer electrode portion formed of second stripe electrodes arranged on the substrate so as to be orthogonal to each of the first stripe electrodes;
A single-layer electrode portion formed of the first stripe electrode of a layer, and a multi-layer electrode portion having a plurality of stripe electrodes formed via an electrical insulating layer formed on the first stripe electrode. , The first strap in the multilayer electrode portion.
The first electrode is a first stripe in the single-layer electrode portion.
Electrode and is orthogonal to the first stripe electrode.
And the separated stripes
The electrodes are each one of the first stripe electrodes and the front one.
It has an overlapping portion via the electrical insulating layer,
A signal voltage is applied to the stripe electrodes by a line-sequential scanning method, and a selection signal and a non-selection signal are applied to the stripe electrodes on the first substrate in accordance with the timing of the applied signal of the second stripe electrode. A liquid crystal driving method for driving a liquid crystal display device to which a selection signal is applied, wherein a screen corresponding to the single-layer electrode portion and a screen corresponding to the multilayer electrode portion on the other substrate are driven in parallel. Features. In the first liquid crystal driving method, it is preferable that the stripe electrode of the multilayer electrode portion has two layers.

According to the above-described method, it is possible to drive four screens or a plurality of screens of four or more screens. Therefore, a display screen of a large capacity pixel such as an SVGA type, an XGA type, or an SXGA type is used. Also, when driving the screen, the effective voltage value ratio between the selection voltage and the non-selection voltage can be increased, so that the contrast can be maintained and the flicker phenomenon can be reduced.

Next, a second liquid crystal driving method according to the present invention comprises an upper substrate, a lower substrate, a first stripe electrode formed on one of the upper and lower substrates, and the other. A single-layer electrode portion formed of second stripe electrodes arranged on the substrate so as to be orthogonal to each of the first stripe electrodes;
A single-layer electrode portion formed of the first stripe electrode of a layer, and a multi-layer electrode portion having a plurality of stripe electrodes formed via an electrical insulating layer formed on the first stripe electrode. , The first strap in the multilayer electrode portion.
The first electrode is a first stripe in the single-layer electrode portion.
Electrode and is orthogonal to the first stripe electrode.
And the separated stripes
The electrodes are each one of the first stripe electrodes and the front one.
It has an overlapping portion via the electrical insulating layer,
A signal voltage is applied to the stripe electrodes by a line-sequential scanning method, and a selection signal and a non-selection signal are applied to the stripe electrodes on the first substrate in accordance with the timing of the applied signal of the second stripe electrode. A selection signal is applied,
A liquid crystal driving method for a liquid crystal display device further comprising an electrode terminal to which a signal can be applied to each end of the one-layer stripe electrode on the one substrate. Is applied to both sides of the one-layer stripe electrode on the one substrate. In the second liquid crystal driving method, it is preferable that the stripe electrode of the multilayer electrode portion has two layers.

According to the method described above, since the scanning signal is applied from both sides of the electrode, the potential gradient at both ends of the electrode can be reduced, and the display unevenness can be reduced.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the liquid crystal display device of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the electrode structure of the liquid crystal display device of the present invention. Less than,
The description will be made in the order of the manufacturing process.

First, after the color filter 10 is formed on the lower glass substrate 19, first-layer vertical electrodes typified by 11, 12, and 13 are formed. Although not shown, the first-layer vertical electrodes are also formed between the first-layer vertical electrodes 11 and 13 at the same pitch. These first layer vertical electrodes are patterned in a stripe shape by a photo process. The members of these first-layer vertical electrodes are transparent conductive films mainly containing indium oxide.

After the formation of the first vertical electrode, a flat layer 17 which is an electrically insulating film is formed on the first vertical electrode.
The area to be covered is formed so as to be almost half the area on the substrate.

The flat layer 17 can be formed by a sputter deposition method, a plasma CVD method, a spin coating method, a roll coating method, or the like.

In the case of forming by a sputter deposition method or a plasma deposition method, silicon oxide, silicon nitride or the like can be used. When forming by spin coating or roll coating, organic resins such as polyacrylate and polyimide can be used. However, the member is not particularly limited to the above member as long as the member can maintain electrical insulation.

In order to form the flat layer 17 only on a necessary portion, when an evaporation method is used, it can be performed by masking an unnecessary portion, or can be performed by a photo process. In the case of an organic resin, it can also be formed by a photo process or a printing method.

Next, on the flat layer 17, 11a, 12a
a, 13a are formed. Although not shown, the second-layer vertical electrodes are also formed at the same pitch between the second-layer vertical electrodes 11a and 13a. The formation method is
This is the same as the case of the first-layer vertical electrode described above. Similarly, a first layer vertical electrode typified by 14, 15, 16 and a second layer vertical electrode typified by 14a, 15a, 16a can be formed in the region on the right side of the substrate.

FIG. 2 shows a lateral cross section of FIG. 2, the upper glass substrate 23 side not shown in FIG. 1 is added. A multilayer electrode portion is formed at an overlapping portion of the first layer vertical electrode represented by 11 and 14 and the second layer vertical electrode portion represented by 11a and 14a. In FIG. 1 and FIG.
Although the one having the layered structure has been described, 3
It is also possible to form a multilayer electrode structure having more than two layers.

FIG. 3 is an enlarged view of a portion A in FIG. This figure shows a case where LSIs 31 and 32 are stacked on the electrode terminals. By stacking the LSIs 31 and 32, signals can be supplied to the vertical electrodes by the LSI chip.

Hereinafter, a four-screen driving method using the liquid crystal display device shown in FIGS. 1 and 2 will be described. The four-screen driving method is a liquid crystal driving method in which a screen is divided into four and each screen is driven in parallel. In FIG. 1, the second vertical electrode forming portion (left side in FIG. 1) is a first screen portion 25, and the first vertical electrode forming portion (left side in FIG. 1) is a second screen except for the second vertical electrode forming portion. Except for the portion 26, the first screen vertical electrode forming portion (right side in FIG. 1) except for the second layer vertical electrode forming portion is the third screen portion 27, and the second layer vertical electrode forming portion (right side in FIG. 1) is the fourth screen portion. The screen unit 28 is used.

FIG. 4 is a diagram conceptually illustrating a matrix electrode for driving a liquid crystal display panel. In the figure, m1 to m480 indicate a plurality of striped horizontal electrodes,
n1 to n1920 indicate a plurality of striped vertical electrodes.

When the conceptual diagram of FIG. 4 is applied to the liquid crystal display of FIG. 1, the horizontal electrode m1 is the horizontal electrode 24a of FIG. 2, the horizontal electrode m2 is the horizontal electrode 24b of FIG. 2, and the horizontal electrode m480 is the electrode 24c. Is equivalent to Although only 18 horizontal electrodes are illustrated in FIG. 2 for the sake of convenience, 480 horizontal electrodes are required when the electrodes are arranged as shown in FIG. The vertical electrode n
1 corresponds to the vertical electrodes 11, 11a, 14, 14a of FIG. 2, and the vertical electrode n2 corresponds to the vertical electrodes 12, 12a, 15, 15a of FIG.
The vertical electrode n1920 is the vertical electrode 13, 13a, 13, 13a
Is equivalent to

The electrodes for driving the first screen section 25 are shown in FIG.
Then, the horizontal electrodes are m1 to m120, and the vertical electrodes n1 to n1920.
(11a to 13a in FIG. 1). Similarly, the electrodes for driving the second screen section 26 are shown in FIG.
m240, vertical electrodes n1 to n1920 (11 to 1 in FIG. 1)
3) In FIG. 4, the electrodes for driving the third screen unit 27 are horizontal electrodes m241 to m360 and vertical electrodes n1 to n1920.
(14 to 16 in FIG. 1), the electrodes for driving the fourth screen unit 28 are shown in FIG. 4 as horizontal electrodes m361 to m480 and vertical electrodes n.
1 to n1920 (14a to 16a in FIG. 1).

First, to drive the first screen section 25,
A signal voltage is applied in such a manner that the voltage driving signal scans the horizontal electrodes m1 to m120 line-sequentially. Vertical electrode n1
A selection signal and a non-selection signal are applied to .about.n1920 in accordance with the timing of the applied signal of the horizontal electrode. Similarly to the first screen unit 25, the second screen unit 26, the third screen unit 27, and the fourth screen unit 28 are driven by applying signals to the corresponding electrodes. The application of signals to each electrode is performed by electrode terminals provided on one side of each electrode. With this driving method, four-screen driving for driving each screen in parallel is performed. 1/480 dut for one screen drive
The signal electrode is applied to the horizontal electrode at y, whereas the signal electrode can be applied at 1/120 duty for each screen in four-screen driving.

It should be noted that, as shown in FIG.
The vertical electrodes 11 to 13 used for driving the third screen unit 27 and the vertical electrodes 14 to 16 used for driving the third screen unit 27 are vertical electrodes 11 a to 13 a of the first screen unit and vertical electrodes 14 a to 14 a of the fourth screen unit, respectively.
16a. In this overlapping portion, the vertical electrodes 11
13 and the vertical electrodes 11a to 13a, and the vertical electrodes 14 to 16 and the vertical electrodes 14a to 16a are electrically insulated by electric insulating layers 17 and 18, respectively. Therefore, the driving of the second and third screens does not affect the driving of the first and fourth screens, respectively.

FIG. 5 shows a voltage waveform applied to the horizontal electrodes when the screen is driven. (A) is one screen drive,
(B) shows the case of two-screen drive, and (c) shows the case of four-screen drive, with 1/480 duty and 1/240 duty, respectively.
Drive at y, 1/120 duty. Assuming that the voltage application time to each electrode in the case of one-screen driving is t, it is 2t in two-screen driving and 4t in four-screen driving. The longer the voltage application time to each electrode is, the smaller the applied voltage value can be.

Table 2 below shows the SVGA type and X shown in Table 1.
D when 4 screens are driven for GA and SXGA screens
The relationship between the effective voltage value and the effective voltage value ratio between the selected voltage and the non-selected voltage is shown.

[0043]

[Table 2]

As shown in Table 1, SVGA type, XGA
Voltage and the SXGA type had a single screen drive, the effective voltage ratio was 1.06 or less, while the four screen drive as shown in Table 2 provided an effective voltage ratio in any case. Is larger than 1.06.

Therefore, in the four-screen drive, one-screen drive,
Compared with the two-screen drive, the effective voltage ratio between the selection voltage and the non-selection voltage can be increased, a sufficient response of the liquid crystal at the time of selection can be secured, and the contrast decreases.

In the present embodiment, the four-screen drive using the two-layer electrode structure has been described. However, the use of the liquid crystal display device having the three-layer electrode structure enables six-screen drive. In this case 4
The effective voltage ratio between the selection voltage and the non-selection voltage can be further increased as compared with the screen driving. Further, when the electrodes are further multi-layered, more screen driving is possible.

FIG. 6 shows that the horizontal electrode 2 extends from the surface of the first layer vertical electrode.
4, the distance from the surface of the second layer vertical electrode to the horizontal electrode 2
4 is a diagram illustrating an embodiment in which the distances to the surface of No. 4 are the same. In the electrode structure shown in FIG. 2, the distance from the surface of the second-layer vertical electrode to the surface of the horizontal electrode 24 is smaller than the distance from the surface of the first-layer vertical electrode to the surface of the horizontal electrode 24. It is shorter by the thickness of the films 17 and 18. As described above, the electric field strength (applied voltage / inter-electrode distance) is also different in a portion having a different inter-electrode distance.

Different electric field strengths cause display unevenness. If the thickness of the electrically insulating films 17 and 18 is sufficiently small, such display unevenness does not cause any problem. However, if the thickness of the electrical insulating films 17 and 18 exceeds a certain value, the display unevenness cannot be ignored. In some cases. The electrode structure shown in FIG.
It is to solve such a problem. In this figure, 11,
The first vertical electrodes represented by 14 each have a stepped portion 20.
Thus, the lower electrode and the upper electrode are configured in two stages. An electric insulating layer 51 is formed below the upper electrode. By changing the size of the step portion 20 of the first vertical electrode and the thickness of the electrical insulating layer 51, the position of the surface of the upper electrode in the height direction can be adjusted. When the position of the surface of the upper electrode in the height direction is closer to the position of the surface of the second-layer vertical electrode in the height direction, the difference in electric field strength is reduced, and display unevenness can be reduced.
In particular, if the positions of the surface of the upper electrode and the second layer vertical electrode in the height direction are the same, there is no difference in the electric field intensity, so that the effect of reducing display unevenness is great.

Although FIG. 6 shows the case where the multi-layer electrode portion has two layers, even when the number of the electrodes is three or more,
A similar vertical electrode structure can be formed by providing a step on the electrode below the uppermost layer.

In the above embodiment, the application of the scanning signal to the horizontal electrodes is performed by the electrode terminals provided on one side of the horizontal electrodes. If electrode terminals are provided on both sides of the horizontal electrode, scanning signals can be applied from both sides of the horizontal electrode. When the scanning signal is applied from only one side, a potential gradient occurs between the supply portion and the terminal portion of the electrode, which causes display unevenness. When a scanning signal is applied from both sides, a potential gradient can be reduced, and display unevenness can be reduced.

If one of the vertical and horizontal electrodes is made of a metal electrode such as Al or Ag having a high reflectivity, a reflection type liquid crystal display panel can be manufactured. The formation of the Al and Ag electrodes can be usually performed by forming a film on the substrate surface by sputtering evaporation or electron beam evaporation and then patterning the film by a photo process.

FIG. 3 shows a state in which driving LSIs 31, 32 are mounted on the vertical electrode terminals 11, 11a stacked as described above. The thickness of the electrically insulating layer is preferably smaller in the display region as long as the insulating property can be maintained. However, when the LSI is mounted on the electrode terminal portion, the thickness is preferably larger. This is because when the LSI is mounted on the electrode terminal portion, if the film thickness is small, the electrical insulating layer may be damaged. Specifically, the thickness of the electrically insulating layer in the display region is preferably 3 μm or less. On the other hand, the electrode terminal portion on which the LSI is mounted is preferably 10 μm to 30 μm. As described above, the electrically insulating layer having different thicknesses in the display region and the electrode terminal is formed by first forming a thin layer on the substrate, then patterning by a photo process, then forming the insulating layer thicker, and then performing the photo process. It can be formed by a patterning method.

In the cross-sectional view of the liquid crystal display panel described in the present invention, the phase polarizing plate as an optical element is not shown because it has no direct relation to the main feature of the present invention.

Although the position of the color filter is formed on the substrate on which the vertical electrodes are formed in the embodiment of the present invention, it may be formed on the substrate on which the horizontal electrodes are formed.

[0055]

As described above, according to the liquid crystal display device of the present invention, a multilayer structure in which a single-layer electrode portion and a stripe electrode are formed in multiple layers on one of the upper and lower substrates via an electrical insulating layer. 4 screen drive or 4 screen
Since it is possible to drive a plurality of screens over the screen,
Even in the case of a large-capacity pixel display screen such as a GA type, an XGA type, or an SXGA type, the ratio between the selection voltage and the non-selection voltage can be increased when driving the screen. Reduction is possible.

Further, by mounting a signal supply LSI chip on the terminals of the stripe electrodes of the multi-layer electrode section, the liquid crystal display device having the multi-layer electrode section also has
The I chip enables signal supply.

When the signal supply LSI chip is mounted, the thickness of the portion corresponding to the display region of the electrically insulating layer is made thinner than the thickness of the portion corresponding to the electrode terminal. In this case, it is possible to prevent the electrical insulating layer from being damaged when an LSI is mounted on the unit.

Further, by using the stripe electrode on one substrate side as a metal reflective electrode and the stripe electrode on the other substrate side as a transparent electrode, even in a liquid crystal display device having a multi-layer electrode portion, a reflective liquid crystal display can be obtained. Panels can be made.

Since the scanning signal can be applied from both sides of the electrode by providing an electrode terminal to which a signal can be applied to each end of the stripe electrode of one layer, both ends of the electrode can be applied. The potential gradient can be reduced, and display unevenness can be reduced.

Further, the multilayer electrode is formed by laminating a planar stripe electrode and a stripe electrode composed of an upper electrode and a lower electrode with a step portion via an electric insulating layer, thereby forming a step portion of the electrode. By changing the dimension of the upper electrode surface and the thickness of the electrical insulating layer, the position of the upper electrode surface in the height direction can be adjusted. When the position is closer to the position in the height direction of the surface, the difference in electric field strength is reduced, and display unevenness can be reduced.

Further, according to the liquid crystal driving method of the present invention, a liquid crystal display device having a multi-layer electrode portion formed on one of the upper and lower substrates is provided with a screen corresponding to a single-layer electrode portion, and By driving the screen corresponding to the multi-layer electrode portion in parallel, it is possible to drive four screens or drive a plurality of screens of four or more screens.
Even in the case of a display screen having a large capacity pixel such as an A-type, when driving the screen, the effective voltage value ratio between the selected voltage and the non-selected voltage can be increased, so that the contrast is maintained and the flicker phenomenon is reduced. It becomes possible.

Further, by applying a signal to each end of the stripe electrode of one layer and driving the screen, a potential gradient at both ends of the electrode can be reduced, and display unevenness can be reduced. .

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of an electrode structure of a liquid crystal display device of the present invention.

FIG. 2 is a sectional view of an embodiment of the liquid crystal display device of the present invention.

FIG. 3 is a sectional view of a portion A in FIG. 2;

FIG. 4 is a conceptual diagram of a matrix electrode for driving a liquid crystal display panel.

FIG. 5 is a diagram showing a voltage waveform applied to a horizontal electrode when performing screen driving.

FIG. 6 is a sectional view of an embodiment of the liquid crystal display device of the present invention.

FIG. 7 is a simplified diagram of a vertical electrode structure when performing two-screen driving.

[Explanation of symbols]

11, 12, 13, 14, 15, 16 First layer vertical electrode 11a, 12a, 13a, 14a, 15a, 16a Second layer vertical electrode 17, 18 Electrical insulating film 19 Lower substrate 20 Stepped portion 21 Seal resin 22 Liquid crystal 23 Upper substrate 24, 24a, 24b, 24c Horizontal electrode 31, 32 Driving LSI 51 Electric insulating film

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/1343 G02F 1/133 G02F 1/1345 G09F 9/00-9/46 G09G 3/36

Claims (13)

(57) [Claims] 1. A liquid crystal display device comprising an upper substrate and a lower substrate, wherein the first stripe electrode formed on one of the upper and lower substrates and the second stripe electrode is formed on the other substrate. A single-layer electrode portion formed of a second stripe electrode arranged so as to be orthogonal to each of the first stripe electrodes, and is formed of one layer of the first stripe electrode on the one substrate. A single-layer electrode portion, and a multi-layer electrode portion in which stripe electrodes are formed in multiple layers via an electrical insulating layer formed on the first stripe electrode . Stripe electrodes
Integrally with the first stripe electrode in the single-layer electrode portion
Yes, in a direction orthogonal to the first stripe electrode
And the separated stripe electrode is
Each one of the first stripe electrodes and the electrical insulating layer
And a signal voltage is applied to the second stripe electrode by a line-sequential scanning method, and the second stripe is applied to the stripe electrode on the first substrate. A liquid crystal display device, wherein a selection signal and a non-selection signal are applied in accordance with the timing of an electrode application signal. 2. The liquid crystal display device according to claim 1, wherein the stripe electrode of the multilayer electrode portion has two layers. 3. An upper substrate, a lower substrate, a first stripe electrode formed on one of the upper and lower substrates, and each of the first stripe electrodes on the other substrate orthogonal to the first stripe electrode. A single-layer electrode portion formed by a second stripe electrode arranged so as to form a single-layer electrode portion formed by one layer of the first stripe electrode on the one substrate; A multilayer electrode portion in which stripe electrodes are formed in multiple layers via an electrical insulating layer formed on the first stripe electrode, wherein the first stripe electrode in the multilayer electrode portion is
Integrally with the first stripe electrode in the single-layer electrode portion
Yes, in a direction orthogonal to the first stripe electrode
And the separated stripe electrode is
Each one of the first stripe electrodes and the electrical insulating layer
And a signal voltage is applied to the second stripe electrode by a line-sequential scanning method, and the second stripe is applied to the stripe electrode on the first substrate. A liquid crystal driving method for driving a liquid crystal display device to which a selection signal and a non-selection signal are applied in accordance with a timing of an application signal of an electrode, wherein a screen corresponding to the single-layer electrode portion on the other substrate is provided. A liquid crystal driving method comprising: driving a screen corresponding to a multilayer electrode portion in parallel. 4. The liquid crystal driving method according to claim 3, wherein the stripe electrodes of the multilayer electrode portion have two layers. 5. The liquid crystal display device according to claim 1, wherein a signal supply LSI chip is mounted on a terminal of the stripe electrode of the multilayer electrode portion. 6. The liquid crystal display device according to claim 5, wherein a film thickness of a portion corresponding to a display region of the electrically insulating layer is smaller than a film thickness of a portion corresponding to an electrode terminal. 7. The liquid crystal display device according to claim 1, wherein the stripe electrode on the one substrate side is a metal reflection electrode, and the stripe electrode on the other substrate side is a transparent electrode. 8. The liquid crystal display device according to claim 1, further comprising an electrode terminal to which signals can be applied to both ends of the one-layer stripe electrode on the one substrate. 9. An upper substrate, a lower substrate, a first stripe electrode formed on one of the upper and lower substrates, and a direction orthogonal to each of the first stripe electrodes on the other substrate. A single-layer electrode portion formed by a second stripe electrode arranged so as to form a single-layer electrode portion formed by one layer of the first stripe electrode on the one substrate; A multilayer electrode portion in which stripe electrodes are formed in multiple layers via an electrical insulating layer formed on the first stripe electrode, wherein the first stripe electrode in the multilayer electrode portion is
Integrally with the first stripe electrode in the single-layer electrode portion
Yes, in a direction orthogonal to the first stripe electrode
And the separated stripe electrode is
Each one of the first stripe electrodes and the electrical insulating layer
And a signal voltage is applied to the second stripe electrode by a line-sequential scanning method, and the second stripe is applied to the stripe electrode on the first substrate. An electrode terminal to which a selection signal and a non-selection signal are applied in accordance with the timing of an application signal of the electrode, and to which both ends of the one-layer stripe electrode on the one substrate can apply a signal. A liquid crystal driving method for a liquid crystal display device, wherein a signal is applied to both sides of a one-layer stripe electrode on the one substrate using the electrode terminals. 10. The multi-layer electrode portion having a stripe electrode of 2
The liquid crystal driving method according to claim 9, which is a layer. 11. The multilayer electrode portion is formed by laminating a planar stripe electrode of an uppermost layer portion and a stripe electrode composed of an upper electrode and a lower electrode by a step portion via an electric insulating layer. Item 2. The liquid crystal display device according to item 1. 12. The multilayer electrode portion is formed by laminating a planar stripe electrode of an uppermost layer portion and a lower electrode of a stripe electrode composed of an upper electrode and a lower electrode by a step portion via an electric insulating layer. The liquid crystal display device according to claim 2, wherein 13. The surface of the uppermost layer electrode and the surface of each of the upper electrodes are on the same plane.
The liquid crystal display device as described in the above.