JP2001350154A - Liquid crystal display device and electronic equipment using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which the hue of a liquid crystal display of a nonlighting region in a pixel region and the hue of the display of a wiring region that is a portion of a background region are made approximately equal to each other in spite of the fact that the display is made to have high definition and narrow picture frame. SOLUTION: The liquid crystal display device 10 is of a simple matrix type. One of the liquid crystal panel substrates is provided with a scanning wiring region in which wiring to scanning electrodes 32 is formed and the other liquid crystal panel substrates is provided with plural dummy signal electrodes 23a and 23b which are placed opposite to the scanning wiring region. A signal driver always applies a nonlighting voltage to the electrodes 23a and 23b. The other liquid crystal panel substrate is provided with a signal wiring region in which wiring to signal electrodes 22 is formed. The former liquid crystal panel substrate is provided with a dummy scanning electrode 33 that is placed opposite to the signal wiring region. While a selection voltage is applied to the electrode 33, the signal driver applies a nonlighting voltage to all of the electrodes 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a liquid crystal display device and an electronic apparatus using the same.

[0002]

2. Description of the Related Art Generally, in a liquid crystal display device, the color of a pixel region but a region where liquid crystal is not lit and the background region other than the pixel region are substantially uniform. It is expected. In addition, the hue of the liquid crystal may be
It depends on the thickness of the liquid crystal sandwiched between the pair of liquid crystal panel substrates. Therefore, the thickness of the liquid crystal is different between the region of the liquid crystal panel substrate where the display electrode is formed and the region where the display electrode is not formed even if the state of the applied electric field is the same. Causes the color to be different.

In a liquid crystal display device of matrix display, display electrodes are formed on the inner surface side of each of the opposing liquid crystal panel substrates in the pixel region. However, in the wiring region where the wiring to the pixel electrode is formed in the background region, the wiring electrode is generally formed only on one liquid crystal panel substrate. In such a liquid crystal display device, a driving circuit is connected to a liquid crystal panel substrate facing the wiring region in order to make the color of the pixel region where the liquid crystal is not lit and the wiring region substantially the same. No dummy electrodes have been formed. In addition, due to capacitive coupling between the dummy electrode and the wiring facing the dummy electrode, the dummy electrode has a specific potential for lighting the liquid crystal between the wiring in the wiring area, and the liquid crystal between the dummy electrode and the wiring is turned on. In order to avoid such a situation, the dummy electrode has been provided as an independent electrode for each opposed wiring.

However, the wiring formed in the wiring area has become very thin as the definition of the liquid crystal display becomes higher and the frame becomes narrower, so that a plurality of dummy electrodes are formed due to misalignment of the opposing liquid crystal panel substrates. Considering that it does not face the wiring of the dummy electrode, the dummy electrode becomes very thin and hardly functions as a dummy electrode, or it becomes impossible to form the dummy electrode itself. ing. Therefore, it is becoming difficult to make the color tone of the liquid crystal display in the non-lighting area in the pixel area substantially equal to the color tone of the liquid crystal display in the wiring area in the background area.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a liquid crystal display in a non-lighting area in a pixel area despite high definition and narrow frame. It is an object of the present invention to provide a liquid crystal display device capable of making a color tone substantially equal to a color tone of a liquid crystal display in a wiring region in a background region, and an electronic apparatus using the same.

[0006]

In this specification, turning on the liquid crystal means that the liquid crystal is in a controlled state opposite to the controlled state of the liquid crystal in the background area. For example, in a normally white display, an area where liquid crystal is turned on is a dark area where light is not transmitted, and in a normally black display, an area where liquid crystal is turned on is a bright area where light is transmitted.

(1) A liquid crystal display device according to the present invention comprises a first liquid crystal panel substrate on which a plurality of scanning electrodes are formed in parallel on a substrate, and a plurality of signal electrodes formed in parallel on the substrate. A second liquid crystal panel substrate in which the signal electrodes are arranged in a lattice shape facing the plurality of scanning electrodes; and a liquid crystal sandwiched between the first liquid crystal panel substrate and the second liquid crystal panel substrate. Sequentially selecting at least one of the scanning electrodes, applying a selection voltage enabling lighting of liquid crystal between the selected scanning electrode and the signal electrode to the selected scanning electrode, and not selecting A scan drive circuit for applying a non-selection voltage for disabling the liquid crystal between the scan electrode and the signal electrode to the unselected scan electrodes, and the scan electrode to which the selection voltage is applied and the signal Liquid between electrodes A signal driving circuit for applying to each of the signal electrodes, a lighting voltage for lighting the crystal, or a non-lighting voltage that does not turn on the liquid crystal between the scanning electrode and the signal electrode to which the selection voltage is applied. Wherein the first liquid crystal panel substrate has a scanning wiring region that is a region in which wiring to the plurality of scanning electrodes is formed, and the second liquid crystal panel substrate has the signal driving circuit. And a dummy signal electrode facing the scanning wiring region, wherein the signal drive circuit always applies the non-lighting voltage to the dummy signal electrode.

According to the present invention, the dummy signal electrode is formed on the second liquid crystal panel substrate so as to face the scanning wiring region where the wiring to the plurality of scanning electrodes is formed on the first liquid crystal panel substrate. Therefore, in this liquid crystal display device, the liquid crystal panel substrate has electrodes on both inner surfaces in the scanning wiring region as in the pixel region. Therefore,
The thickness of the liquid crystal sandwiched between the pair of liquid crystal panel substrates can be substantially the same in the scanning wiring region as in the pixel region. Due to the difference in the thickness of the liquid crystal,
This prevents the color tone of the liquid crystal display in the non-lighting area in the pixel area from being different from the color tone of the liquid crystal display in the scanning wiring area that is a part of the background area.

In addition, since the non-lighting voltage is always applied to the dummy signal electrode by the signal driving circuit, the dummy signal electrode is connected to the scanning wiring region by capacitive coupling with the wiring of the scanning wiring region facing the dummy signal electrode. A specific potential for turning on the liquid crystal between the wirings does not occur. As a result, the liquid crystal between the dummy signal electrode and the scanning wiring region does not light. This is possible without forming dummy signal electrodes as a large number of fine areas so as to face individual wirings in the scanning wiring area. It can be applied to the case where each wiring is fine.

Therefore, the color tone of the liquid crystal display in the non-lighting area in the pixel area and the color tone of the liquid crystal display in the scanning wiring area, which is a part of the background area, are substantially reduced despite the high definition and narrow frame. Can be equal.

(2) The liquid crystal display device according to the present invention is characterized in that the dummy signal electrode is branched into a plurality.

According to the present invention, since the dummy signal electrode is branched into a plurality of parts, the distribution density of the dummy signal electrodes can be made substantially the same as the distribution density of the signal electrodes in the pixel region. As a result, the color of the liquid crystal display in the non-lighting area in the pixel area can be further equalized with the color of the liquid crystal display in the scanning wiring area which is a part of the background area.

(3) The liquid crystal display device according to the present invention is characterized in that a plurality of the dummy signal electrodes are provided.

According to the present invention, since the dummy signal electrodes are formed as a plurality of dummy signal electrodes, it is possible to drive the plurality of dummy signal electrodes as the plurality of signal electrodes connected to the signal drive circuit. . This makes it possible to reduce the area of each dummy signal electrode so as not to cause an excessive load on the signal drive circuit, so that the dummy signal electrodes can be reliably driven.

(4) In the liquid crystal display device according to the present invention, a first liquid crystal panel substrate on which a plurality of scanning electrodes are formed in parallel on a substrate, and a plurality of signal electrodes formed in parallel on the substrate. A second liquid crystal panel substrate in which the signal electrodes are arranged in a lattice shape facing the plurality of scanning electrodes; and a liquid crystal sandwiched between the first liquid crystal panel substrate and the second liquid crystal panel substrate. Sequentially selecting at least one of the scanning electrodes, applying a selection voltage enabling lighting of liquid crystal between the selected scanning electrode and the signal electrode to the selected scanning electrode, and not selecting A scan drive circuit for applying a non-selection voltage for disabling the liquid crystal between the scan electrode and the signal electrode to the unselected scan electrodes, and the scan electrode to which the selection voltage is applied and the signal Liquid between electrodes A signal driving circuit for applying to each of the signal electrodes, a lighting voltage for lighting the crystal, or a non-lighting voltage that does not turn on the liquid crystal between the scanning electrode and the signal electrode to which the selection voltage is applied. Wherein the second liquid crystal panel substrate has a signal wiring region that is a region in which wiring to the plurality of signal electrodes is formed, and the first liquid crystal panel substrate includes the scanning drive circuit. And the signal drive circuit applies the non-lighting voltage to all of the signal electrodes while a selection voltage is applied to the dummy scan electrodes. It is characterized by doing.

According to the present invention, the dummy scanning electrodes are formed on the first liquid crystal panel substrate so as to face the signal wiring region in which the wiring to the plurality of signal electrodes is formed on the second liquid crystal panel substrate. Therefore, in this liquid crystal display device, the liquid crystal panel substrate includes electrodes on both inner surfaces in the signal wiring region as in the pixel region. Therefore,
The thickness of the liquid crystal sandwiched between the pair of liquid crystal panel substrates can be substantially the same in the signal wiring region as in the pixel region. Due to the difference in the thickness of the liquid crystal,
This prevents the color tone of the liquid crystal display in the non-lighting area in the pixel area from being different from the color tone of the liquid crystal display in the signal wiring area which is a part of the background area.

In addition, since the dummy scanning electrode is connected to the scanning drive circuit, the dummy scanning electrode is connected to the wiring of the signal wiring region by capacitive coupling with the wiring of the signal wiring region facing the dummy scanning electrode. A specific potential for lighting the liquid crystal does not occur. Since the non-lighting voltage is always applied to all the signal electrodes by the signal driving circuit while the dummy scanning electrodes are selected, the liquid crystal between the dummy scanning electrodes and the signal wiring region is turned on. Never. This is possible without forming the dummy scanning electrodes as a large number of fine areas so as to face the individual wirings in the signal wiring area. It can be applied to the case where each wiring is fine.

Accordingly, the color tone of the liquid crystal display in the non-lighting area in the pixel area and the color tone of the liquid crystal display in the signal wiring area, which is a part of the background area, are substantially reduced despite the high definition and narrow frame of the display. Can be equal.

(5) The liquid crystal display device according to the present invention comprises:
In (4), the dummy scanning electrode is branched into a plurality of parts.

According to the present invention, since the dummy scanning electrodes are branched into a plurality of parts, the distribution density of the dummy scanning electrodes can be made substantially the same as the distribution density of the scanning electrodes in the pixel area. Thereby, the color tone of the liquid crystal display in the non-lighting area in the pixel area and the color tone of the liquid crystal display in the wiring area in the background area can be further equalized.

(6) The liquid crystal display device according to the present invention comprises:
In (4) or (5), the dummy scanning electrode is
It is characterized in that a plurality are provided.

According to the present invention, since the dummy scan electrodes are formed as a plurality of dummy scan electrodes, it is possible to drive the plurality of dummy scan electrodes as the plurality of scan electrodes connected to the scan drive circuit. . This makes it possible to reduce the area of each dummy scanning electrode so as not to impose an excessive load on the scanning drive circuit, so that the dummy scanning electrodes can be driven reliably.

(7) The liquid crystal display device according to the present invention comprises:
(4) In any one of (4) to (6), the first liquid crystal panel substrate has a scanning wiring region which is a region where wiring to the plurality of scanning electrodes is formed, and the second liquid crystal panel substrate has A dummy signal electrode connected to the signal driving circuit and facing the scanning wiring region is provided, and the signal driving circuit always applies the non-lighting voltage to the dummy signal electrode.

According to the present invention, the dummy signal electrodes are formed on the second liquid crystal panel substrate so as to face the scanning wiring regions in which the wiring to the plurality of scanning electrodes is formed on the first liquid crystal panel substrate. Therefore, in this liquid crystal display device, the liquid crystal panel substrate has electrodes on both inner surfaces in the scanning wiring region as in the pixel region. Therefore,
The thickness of the liquid crystal sandwiched between the pair of liquid crystal panel substrates can be substantially the same in the scanning wiring region as in the pixel region. Due to the difference in the thickness of the liquid crystal,
This prevents the color tone of the liquid crystal display in the non-lighting area in the pixel area from being different from the color tone of the liquid crystal display in the scanning wiring area that is a part of the background area.

In addition, since the non-lighting voltage is always applied to the dummy signal electrode by the signal drive circuit, the dummy signal electrode is connected to the wiring in the scanning wiring region facing the dummy signal electrode due to capacitive coupling or the like. A specific potential for turning on the liquid crystal between the wirings does not occur. As a result, the liquid crystal between the dummy signal electrode and the scanning wiring region does not light up. This is possible without forming dummy signal electrodes as a large number of fine areas so as to face individual wirings in the scanning wiring area. It can be applied to the case where each wiring is fine.

Therefore, the color tone of the liquid crystal display in the non-lighting area in the pixel area and the color tone of the liquid crystal display in the scanning wiring area, which is a part of the background area, are substantially reduced despite the high definition and narrow frame. Can be equal.

(8) The liquid crystal display device according to the present invention comprises:
In (7), the dummy signal electrode is branched into a plurality.

According to the present invention, since the dummy signal electrode is branched into a plurality of parts, the distribution density of the dummy signal electrodes can be made substantially the same as the distribution density of the signal electrodes in the pixel region. As a result, the color of the liquid crystal display in the non-lighting area in the pixel area can be further equalized with the color of the liquid crystal display in the scanning wiring area which is a part of the background area.

(9) The liquid crystal display device according to the present invention comprises:
(7) or (8), wherein the dummy signal electrode is
It is characterized in that a plurality are provided.

According to the present invention, since the dummy signal electrodes are formed as a plurality of dummy signal electrodes, it is possible to drive the plurality of dummy signal electrodes as the plurality of signal electrodes connected to the signal drive circuit. . This makes it possible to reduce the area of each dummy signal electrode so as not to cause an excessive load on the signal drive circuit, so that the dummy signal electrodes can be reliably driven.

(10) An electronic apparatus according to the present invention includes any one of the above display devices as a display unit.

According to the present invention, it is possible to obtain an electronic apparatus having a display device having the above-described functions and effects as display means.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below more specifically with reference to the drawings.

1. First Embodiment 1.1 Liquid Crystal Display Device FIG. 1 is a block diagram showing a configuration of a liquid crystal display device which is a display device according to a first embodiment of the present invention. As shown in FIG. 1, the liquid crystal display device 10 includes an image information output source 74, an image information processing circuit 76, a scan driver 80 as a scan drive circuit, a signal driver 82 as a signal drive circuit, a liquid crystal panel 14 as a display panel, The configuration includes a clock circuit 70 and a power supply circuit 72.

The image information output source 74 includes a memory such as a ROM and a RAM, a tuning circuit for synchronizing and outputting a video signal, and the like. Is output.

The image information processing circuit 76 includes a clock circuit 7
Process the image information based on the clock signal from 0,
It outputs image data, scan data, and control signals.
The display information processing circuit 76 can include, for example, an amplification circuit, a phase expansion circuit, a rotation circuit, a gamma correction circuit, a clamp circuit, and the like.

The scan driver 80 (scan drive circuit) receives scan data and a control signal from the image information processing circuit 76, and outputs a scan voltage to the scan electrodes of the liquid crystal panel 14.

The signal driver 82 (signal drive circuit) receives image data and a control signal from the image information processing circuit 76 and outputs a signal voltage to signal electrodes of the liquid crystal panel 14, and includes a level shift circuit. Be composed.

The liquid crystal panel 14 has a plurality of signal electrodes 22,
A plurality of signal electrodes 32 intersecting with this, and signal electrodes 2
It is configured to include a liquid crystal element (not shown) which is a display element disposed at each intersection region between the signal electrode 32 and the signal electrode 32, and displays an image by driving the scanning driver 80 and the signal driver 82. The liquid crystal panel 14 will be described later in detail in connection with the scanning driver 80 and the signal driver 82.

The clock circuit 70 supplies a clock signal to each of the above circuits.

The power supply circuit 72 supplies power to each of the above circuits.

1.2 Liquid Crystal Panel FIG. 2 is a schematic plan view of the liquid crystal panel 14, and FIG. 3 is a schematic cross-sectional view taken along a line LL shown in FIG.

As shown in FIG. 3, the liquid crystal panel 14 has a scanning electrode 32 provided on a substrate 31 made of glass or plastic and having a stripe-shaped scanning electrode 32 covered with an alignment film 44. A liquid crystal panel substrate 30 (first liquid crystal panel substrate) and a liquid crystal on the display surface side formed by forming a stripe-shaped signal electrode 22 on a substrate 21 also made of glass or plastic and covering the surface thereof with an alignment film 44 And a panel substrate 20 (second liquid crystal panel substrate). And the liquid crystal panel 14
The pair of liquid crystal panel substrates 20 and 30 are separated by a predetermined distance by spacers 48 and the like distributed between them, so that the scanning electrodes 32 of the liquid crystal panel substrate 30 and the signal electrodes 22 of the liquid crystal panel substrate 20 form a grid. The liquid crystal panel 14 is a simple matrix type liquid crystal panel facing the liquid crystal panel. Scanning electrode 3
2 and the signal electrode 22 are made of ITO which is a transparent conductive film.
(Indium Tin Oxide) film. A TN (Twisted Nematic) is provided between the pair of liquid crystal panel substrates 20 and 30.
matic) type liquid crystal 40, and the opposing peripheral edges of the liquid crystal panel substrates 20 and 30 are sealed with a sealant 40. In the liquid crystal panel 14, a terminal portion 28 having a plurality of terminals is formed in a region where the liquid crystal panel substrate 20 protrudes from the liquid crystal panel substrate 30. Terminal 2
8 are, for example, a scanning electrode 32 and a signal electrode 2
2 and is formed as an ITO film. Terminal 28
Are connected to corresponding terminals of a flexible wiring board (not shown), for example, and signals from the scanning driver 80 and the signal driver 82 are input. Polarizing plates 56, outside the pair of liquid crystal panel substrates 20, 30,
58 are arranged. The reflecting plate 60 is disposed on the back side of the deflecting plate 58.

In FIG. 2, the scanning electrodes 32 formed on the liquid crystal panel substrate 30 on the display surface side are indicated by solid lines, and the signal electrodes 22 formed on the liquid crystal panel substrate 20 are indicated by solid lines.
Is indicated by a broken line. In FIG. 2, the scanning electrode 32 and the signal electrode 22 are drawn as lines, but are actually formed with a predetermined width. In FIG. 3, the pair of substrates 20 and 30 are drawn widely apart, but this is for clarity of illustration, and the pair of substrates 20 and 30 is actually several μm to 10 μm. They oppose each other with a narrow gap of several μm. Although only a few signal electrodes 22 and scanning electrodes 32 are shown in each drawing, they are actually provided as a large number of striped electrodes corresponding to the resolution of matrix display.

As shown in FIG. 2 which is a schematic plan view of the liquid crystal panel 14, in the liquid crystal panel 14, a plurality of scanning electrodes 32 formed on a liquid crystal panel substrate 30 and a plurality of scanning electrodes 32 formed on the liquid crystal panel substrate 20. The plurality of signal electrodes 22 are formed so as to face each other and form a grid. The arrangement of the scanning electrode 32 and the signal electrode 22 forms a pixel region which is a region where the scanning electrode 32 and the signal electrode 22 intersect.
In the pixel area, an electric field is applied to the liquid crystal 52 at the opposing portions of the scanning electrode 32 and the signal electrode 22. Each scanning electrode is connected to a scanning driver via a corresponding wiring and terminal, and each signal electrode is connected to a signal driver via a corresponding wiring and terminal.

Further, the liquid crystal panel substrate 30 has a wiring 3
A scanning wiring area, which is an area in which the wiring patterns 4 and 35 are formed, is provided. The liquid crystal panel substrate 20 has two dummy signal electrodes 23a and 23
b. The dummy signal electrodes 23a and 23b are connected to a signal driver 82.

Further, the liquid crystal panel substrate 20 includes a liquid crystal 52
Is provided with a scanning wiring region, which is a region where the respective wirings 24 to the plurality of signal electrodes 22 are formed. The liquid crystal panel substrate 30 includes a dummy scanning electrode 33 in a region facing the scanning wiring region. The dummy scan electrode 33 is connected to a scan driver 80.

1.3 Scan Driver and Signal Driver The scan driver 80 (scan drive circuit) drives the scan electrodes 32 based on the scan data and control signals received from the image information processing circuit 76 as follows. That is, the scan driver 80 sequentially selects at least one of the scan electrodes 32, and applies a selection voltage that enables the liquid crystal 52 between the selected scan electrode 32 and the signal electrode 22 to be turned on to the selected scan electrode 32. Apply. Then, a non-selection voltage for disabling the liquid crystal 52 between the unselected scanning electrode 32 and the signal electrode 22 is applied to the unselected scanning electrode 32. Further, the scan driver 80 applies a selection voltage or a non-selection voltage to the dummy scanning electrode 33 described above.

The signal driver 82 (signal drive circuit) drives the signal electrode 22 as follows based on the image data and the control signal received from the image information processing circuit 76. That is, the signal driver 82 turns on the liquid crystal 52 between the scanning electrode 32 and the signal electrode 22 to which the selection voltage is applied, or the scanning voltage applied to the scanning electrode 32 and the signal electrode 22 to which the selection voltage is applied. During this time, a non-lighting voltage that does not light the liquid crystal 52 is applied to each signal electrode 22.
Further, the signal driver 82 always applies a non-lighting voltage to the dummy signal electrode 23. In addition, the signal driver 82 is connected to the dummy scanning electrode 33 described above.
The non-lighting voltage is applied to all of the signal electrodes 22 while the selection voltage is being applied.

FIG. 4 shows that the scanning driver 80 is connected to each scanning electrode 3.
.. Cn to be applied to each signal electrode 2, the lighting voltage Sk (ON) or the non-lighting voltage Sk (OFF) applied to each signal electrode 22 by the signal driver 82, and the scanning electrodes 32 in the first row.
Lighting voltage C applied to the liquid crystal 52 between the electrode and the signal electrode
1Sk (ON) or non-lighting voltage C1Sk (OFF)
Are voltage waveforms over two frame periods Tf. The scan driver 80 applies to each scan electrode 32;
In the voltage waveforms C1 to Cn shown in FIG. 4, the positive or negative pulsed voltage is the selection voltage Vs, and the period during which the selection voltage is applied is the selection period. Further, Sk (on), Sk in FIG.
As shown as (OFF), the lighting voltage Sk (ON) which is a specific voltage at which the potential difference from the selection voltage in the frame is equal to or more than a predetermined absolute value, or the potential difference from the selection voltage in the frame is a predetermined absolute value A non-lighting voltage Sk (off), which is a specific voltage described below, is applied over each frame. In FIG. 4, the lighting voltage C1Sk (ON) and the non-lighting voltage C1S applied to the liquid crystal 52 between the scanning electrode 32 and the signal electrode in the first row.
k (off) as an example, the opposite scanning electrode 3
Only when the scanning electrode 32 is selected and a selection voltage is inputted between the scanning electrode 32 and the signal electrode 22 and a lighting voltage is applied to the signal electrode 22, the liquid crystal 52 between them is turned on. Voltage having a magnitude of a sufficient absolute value is applied.

The symbols C1 to Cn in FIG. 2 indicate that the corresponding voltage waveforms C1 to Cn in FIG. 4 are applied to the scan electrodes. Symbols S1 to Sp in FIG.
Indicates a voltage waveform to which the lighting voltage Sk (on) or the non-lighting voltage Sk (off) is applied in each frame. That is, the signal driver 82 regards each of the dummy signal electrodes 23a and 23b as one signal electrode, and applies the voltage waveform S1 and the voltage waveform Sp which are the non-lighting voltage Sk (off) in each frame. Further, the scan driver 80 regards the dummy scan electrode 33 as one scan electrode, and applies a voltage waveform Cn that is a selection voltage when the dummy scan electrode 33 is selected.

Therefore, as described above, the liquid crystal 52 in the area corresponding to the dummy signal electrode 23 to which the non-lighting voltage is always applied by the signal driver 82 does not light. In addition, while the selection voltage for selecting the dummy scanning electrode 33 is applied, the non-lighting voltage is applied to all of the signal electrodes 22 as described above. The liquid crystal 52 in the area is not lit again.

1.4 Electronic Device Equipped with Liquid Crystal Display Device FIGS. 5A, 5B, and 5C show examples of electronic devices using the liquid crystal display device 10 of the present embodiment as a display unit. It is an external view. FIG. 5A illustrates a mobile phone 88.
The liquid crystal display device 10 is provided above the front surface. FIG.
(B) shows a wristwatch 92, in which a display unit using the liquid crystal display device 10 is provided at the center of the front of the main body. FIG. 5 (C)
Denotes a portable information device 96, which includes a display unit including the liquid crystal display device 10 and an input unit 98. For example, in the case of the portable information device 96, a display image is formed by supplying a display signal generated by the display signal generation unit based on information input from the input unit 98 to the display unit.

The electronic devices in which the liquid crystal display device 10 of the present embodiment is incorporated are not limited to mobile phones, wristwatches, and portable information devices, but may be notebook computers, electronic notebooks, pagers, calculators, POS terminals, IC cards, and the like. And various electronic devices such as a mini-disc player.

1.5 Functions and Effects of First Embodiment 1.5.1 In the liquid crystal display device 10, the liquid crystal panel substrate 30 has two scanning wiring areas where the wirings 34 and 35 to a plurality of scanning electrodes are formed. Opposite the dummy signal electrodes 23a and 23b are formed on the liquid crystal panel substrate 20. Therefore, in the liquid crystal display device 10, the liquid crystal panel substrate has electrodes on both inner surfaces in the scanning wiring region as in the pixel region. Therefore, the thickness of the liquid crystal sandwiched between the pair of liquid crystal panel substrates 20 and 30 can be substantially the same in the scanning wiring region as in the pixel region. As a result, due to the difference in the thickness of the liquid crystal 52, the color tone of the liquid crystal display in the non-lighting area in the pixel area is different from the color tone of the liquid crystal display in the scanning wiring area which is a part of the background area. Is prevented.

In addition, since the non-lighting voltage is always applied to the dummy signal electrodes 23a and 23b by the signal driver 82, capacitive coupling with the wirings 34 and 35 in the scanning wiring region facing the dummy signal electrodes 23a and 23b is performed. As a result, the dummy signal electrode 23 is connected to the wirings 34, 3
5 does not reach a specific potential for lighting the liquid crystal 52. As a result, the dummy signal electrodes 23a, 23
The liquid crystal 52 between 3b and the scanning wiring area does not light up. This can be performed without forming the dummy signal electrodes as a large number of fine areas so as to face the individual wirings 34 and 35 in the scanning wiring area. Therefore, the scanning becomes higher with higher definition and narrower frame. Each wiring 34, 3 in the wiring area
5 can also be applied when it is fine. Therefore, the color tone of the liquid crystal display in the non-lighting area in the pixel area and the color tone of the liquid crystal display in the scanning wiring area which is a part of the background area can be made substantially equal despite the high definition and the narrow frame.

1.5.2 The liquid crystal display device 10
A dummy scanning electrode 33 is formed on the liquid crystal panel substrate 30 so as to face a signal wiring region where the wiring 24 to the plurality of signal electrodes 22 is formed on the liquid crystal panel substrate 20. Therefore, the liquid crystal display device 10 has both liquid crystal panel substrates 20 and 3 in the signal wiring region as in the pixel region.
0 will be provided with an electrode on the inner surface side. Therefore, the liquid crystal 52 sandwiched between the pair of liquid crystal panel substrates 20 and 30 is provided.
Can be made substantially the same in the signal wiring region as in the pixel region. As a result, due to the difference in the thickness of the liquid crystal 52, the color tone of the liquid crystal display in the non-lighting area in the pixel area is different from the color tone of the liquid crystal display in the signal wiring area which is a part of the background area. Is prevented.

Further, since the dummy scanning electrode 33 is connected to the scanning driver 80, the dummy scanning electrode 33 is connected to the wiring of the signal wiring area by the capacitive coupling with the wiring 24 of the signal wiring area facing the dummy scanning electrode 33. 24 does not reach a specific potential for lighting the liquid crystal. Further, while the dummy scanning electrode 33 is selected, the non-lighting voltage is always applied to all the signal electrodes 22 by the signal driver 82, so that the liquid crystal between the dummy scanning electrode 33 and the signal wiring region is 52 does not light. This can be performed without forming the dummy scanning electrodes as a large number of fine regions so as to face the individual wirings 24 in the signal wiring region. This can be applied to the case where each of the wirings 24 is fine. Therefore, the color tone of the liquid crystal display in the non-lighting area in the pixel area and the color tone of the liquid crystal display in the signal wiring area which is a part of the background area can be made substantially equal despite the high definition and narrower frame of the display.

2. <Second Embodiment> The second embodiment is different from the first embodiment in that the dummy signal electrode branches into a plurality and the dummy scanning electrode branches into a plurality. Otherwise, the configuration is the same as in the first embodiment, and a description thereof will be omitted. Further, in the drawings, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

FIG. 6 shows a liquid crystal panel 64 according to this embodiment.
FIG. 3 is a schematic plan view corresponding to FIG. 2 in the first embodiment. As shown in this figure, the liquid crystal panel 64 includes a plurality of branched dummy signal electrodes 65a and 65b. Each branch portion of the dummy signal electrode 65a faces several wires 34. Also, the dummy signal electrode 65
Each of the branch portions a faces several wires 35 to the scanning electrode 32. These dummy signal electrodes 65a, 65
b is also the dummy signal electrodes 23a and 23 in the first embodiment.
Similarly to b, it is connected to and driven by the signal driver 82. This makes it possible to make the distribution density of the dummy signal electrodes 65a and 65b substantially the same as the distribution density of the signal electrodes 22 in the pixel region. As a result, the hue of the liquid crystal display in the non-lighting area in the pixel area and the hue of the liquid crystal display in the scanning wiring area which is a part of the background area can be further equalized.

Further, as shown in FIG.
4 includes a plurality of branched dummy scanning electrodes 66. Each branch of the dummy scanning electrode 66 faces several wires 24 to the signal electrode 22. This dummy scanning electrode 66 is also the dummy scanning electrode 3 in the first embodiment.
As in the case of No. 3, the scanning driver 80 is connected and driven. As described above, since the dummy scanning electrodes 66 are branched into a plurality of parts, the distribution density of the dummy scanning electrodes 66 can be made substantially the same as the distribution density of the scanning electrodes 32 in the pixel region. Thereby, the color tone of the liquid crystal display in the non-lighting area in the pixel area can be further equalized with the color tone of the liquid crystal display in the signal wiring area which is a part of the background area.

3. Third Embodiment The third embodiment is different from the first embodiment in that a large number of dummy signal electrodes are provided and a plurality of dummy scanning electrodes are provided. Otherwise, the configuration is the same as in the first embodiment, and a description thereof will be omitted. Further, in the drawings, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

FIG. 7 shows a liquid crystal panel 84 according to this embodiment.
FIG. 3 is a schematic plan view corresponding to FIG. 2 in the first embodiment. As shown in this figure, the liquid crystal panel 84 includes a large number of dummy signal electrodes 85a, 85b, 85c, 85d. Each dummy signal electrode 85a, 85
b, 85c, and 85d face several wires 34 and 35. These dummy signal electrodes 85a, 85b, 85c,
85d is also the dummy signal electrode 23a in the first embodiment,
Similarly to 23b, they are connected to the signal driver 82 and are driven so that the non-lighting voltage is always applied.

As a result, the dummy signal electrodes 85a, 85a
The distribution densities of 5b, 85c and 85d can be made almost the same as the distribution density of the signal electrodes 22 in the pixel region. As a result, the hue of the liquid crystal display in the non-lighting area in the pixel area and the hue of the liquid crystal display in the scanning wiring area which is a part of the background area can be further equalized.

Since the dummy signal electrodes are formed as a large number of dummy signal electrodes 85a, 85b, 85c and 85d, a plurality of dummy signal electrodes 85a, 85b and 85 are connected to the signal driver 82 as a plurality of signal electrodes.
c, 85d can be driven. Thereby, the individual dummy signal electrodes 85a, 85b, 85c, 8
Since the area of 5d can be reduced to prevent an excessive load on the signal driver 82, the dummy signal electrode 8
5a, 85b, 85c, 85d can be reliably driven.

Further, as shown in FIG.
4 denotes a plurality of dummy scanning electrodes 86a, 86b, 86c,
86d, 86e and 86f are provided. Each of the dummy scanning electrodes 86a, 86b, 86c, 86d, 86e, 86f faces several wirings 24 to the signal electrode 22. These dummy scanning electrodes 86a, 86b, 86c, 8
Similarly to the dummy scanning electrodes 33 in the first embodiment, 6d, 86e, and 86f are also connected to the scanning driver 80, and each is driven as one scanning electrode.

As described above, the plurality of dummy scan electrodes 86
a, 86b, 86c, 86d, 86e, 86f, the dummy scanning electrodes 86a, 86b, 86
The distribution density of c, 86d, 86e, 86f can be made substantially the same as the distribution density of the scanning electrodes 32 in the pixel area. Thereby, the color tone of the liquid crystal display in the non-lighting area in the pixel area can be further equalized with the color tone of the liquid crystal display in the signal wiring area which is a part of the background area.

Further, the dummy scanning electrodes are composed of a plurality of dummy scanning electrodes 86a, 86b, 86c, 86d, 86e, 86.
f, a plurality of dummy scan electrodes 86 as a plurality of scan electrodes connected to the scan driver 80.
a, 86b, 86c, 86d, 86e, 86f can be driven. Thereby, the individual dummy scanning electrodes 86a, 86b, 86c, 86d, 86e, 86f
Of the dummy scan electrode 86 can be reduced so that the load on the scan driver 80 is not excessively reduced.
a, 86b, 86c, 86d, 86e, 86f can be reliably driven.

4. <Modification> Here, a modification applicable to each of the above-described embodiments will be described. In each of the following modifications, only points different from the above-described embodiments will be described and described.

4.1 In each of the embodiments described above,
As a display panel, a TN (twistednematic) type liquid crystal panel is shown. However, the liquid crystal panel is not limited to this, and various types of liquid crystal panels such as a super twisted nematic (STN) type, a guest host type, a phase transition type, and a ferroelectric type can be used.

4.2 In each of the embodiments described above,
An example of a liquid crystal display device using a reflective liquid crystal panel as the display panel has been described. However, a liquid crystal display device using a transmissive liquid crystal panel as the display panel may be used. In this case, the liquid crystal display device is formed by using a backlight unit, for example, on the rear side without using a reflection plate.

4.3 In the second and third embodiments, an example has been described in which the dummy signal electrode and the dummy scan electrode are branched or divided into a predetermined number. May be branched or divided.

4.4 The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention or within the equivalent scope of the claims.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a liquid crystal display device according to a first embodiment.

FIG. 2 is a schematic plan view of the liquid crystal panel according to the first embodiment.

FIG. 3 is a schematic cross-sectional view at a position along line LL drawn in FIG. 2;

FIG. 4 is a diagram illustrating voltage waveforms applied to a scanning electrode, a signal electrode, and each pixel over two frame periods.

FIGS. 5A and 5B are external views showing an electronic device using the display device of the first embodiment as a display unit, wherein FIG. 5A is a mobile phone, FIG. 5B is a wristwatch, and FIG. It is.

FIG. 6 is a schematic plan view of a liquid crystal panel according to a second embodiment.

FIG. 7 is a schematic plan view of a liquid crystal panel according to a third embodiment.

[Explanation of symbols]

Reference Signs List 10 liquid crystal display device 14, 64, 84 liquid crystal panel 20 liquid crystal panel substrate (second liquid crystal panel substrate) 21, 31 substrate 22 signal electrode 23a, 23b, 65a, 65b, 85a, 85b, 8
5c, 85d Dummy signal electrode 30 Liquid crystal panel substrate (first liquid crystal panel substrate) 32 Scanning electrode 33, 66, 86a, 86b, 86c, 86d, 86
e, 86f Dummy scan electrode 80 Scan driver (scan drive circuit) 82 Signal driver (signal drive circuit) 88 Cellular phone (electronic device) 92 Watch (electronic device) 96 Portable information device (electronic device)

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H092 GA33 JB11 JB23 JB32 NA01 PA06 PA08 QA07 2H093 NA43 NB13 NB23 NC10 NC12 ND14 NE03 NF05 5C006 AC24 AF59 BB11 BC02 FA22 5C080 AA10 BB05 DD01 DD07 FF09 JJ02A04 EA01 EA03 EA07 FA01 GA10

Claims (10)

[Claims] A first liquid crystal panel substrate on which a plurality of parallel scanning electrodes are formed on a substrate; and a plurality of parallel signal electrodes formed on the substrate, wherein the plurality of signal electrodes are connected to the plurality of scanning electrodes. At least one of a second liquid crystal panel substrate, which is arranged to form a lattice shape facing each other, a liquid crystal interposed between the first liquid crystal panel substrate and the second liquid crystal panel substrate, and at least one of the scanning electrodes. A selected voltage is applied to the selected scan electrodes so as to enable the liquid crystal between the selected scan electrodes and the signal electrodes to be turned on, and a select voltage is applied between the unselected scan electrodes and the signal electrodes. A scan driving circuit that applies a non-selection voltage that disables lighting of the liquid crystal to the scanning electrodes that are not selected; and lighting that turns on the liquid crystal between the scanning electrode to which the selection voltage is applied and the signal electrode. Voltage, or A signal driving circuit that applies a non-lighting voltage that does not turn on the liquid crystal between the scanning electrode and the signal electrode to which the selection voltage is applied, to each of the signal electrodes, the liquid crystal display device comprising: The first liquid crystal panel substrate has a scanning wiring region that is a region in which wiring to the plurality of scanning electrodes is formed, and the second liquid crystal panel substrate is connected to the signal driving circuit and faces the scanning wiring region. A display device, comprising: a dummy signal electrode, wherein the signal drive circuit constantly applies the non-lighting voltage to the dummy signal electrode. 2. The display device according to claim 1, wherein the dummy signal electrode is branched into a plurality. 3. The display device according to claim 1, wherein a plurality of the dummy signal electrodes are provided. 4. A first liquid crystal panel substrate having a plurality of scanning electrodes formed in parallel on a substrate, and a plurality of signal electrodes formed in parallel on the substrate, wherein the plurality of signal electrodes are connected to the plurality of scanning electrodes. At least one of a second liquid crystal panel substrate, which is arranged to form a lattice shape facing each other, a liquid crystal interposed between the first liquid crystal panel substrate and the second liquid crystal panel substrate, and at least one of the scanning electrodes. A selected voltage is applied to the selected scan electrodes so as to enable the liquid crystal between the selected scan electrodes and the signal electrodes to be turned on, and a select voltage is applied between the unselected scan electrodes and the signal electrodes. A scan driving circuit that applies a non-selection voltage that disables lighting of the liquid crystal to the scanning electrodes that are not selected; and lighting that turns on the liquid crystal between the scanning electrode to which the selection voltage is applied and the signal electrode. Voltage, or A signal driving circuit that applies a non-lighting voltage that does not turn on the liquid crystal between the scanning electrode and the signal electrode to which the selection voltage is applied, to each of the signal electrodes, the liquid crystal display device comprising: The second liquid crystal panel substrate has a signal wiring region that is a region in which wiring to the plurality of signal electrodes is formed, and the first liquid crystal panel substrate is connected to the scan driving circuit and faces the signal wiring region. The display device, further comprising: a dummy scanning electrode, wherein the signal driving circuit applies the non-lighting voltage to all of the signal electrodes while a selection voltage is applied to the dummy scanning electrode. 5. The display device according to claim 4, wherein the dummy scanning electrode is branched into a plurality. 6. The display device according to claim 4, wherein a plurality of the dummy scanning electrodes are provided. 7. The first liquid crystal panel substrate according to claim 4, wherein the first liquid crystal panel substrate has a scanning wiring region which is a region where wiring to the plurality of scanning electrodes is formed, and The liquid crystal panel substrate has a dummy signal electrode connected to the signal drive circuit and facing the scanning wiring region, wherein the signal drive circuit always applies the non-lighting voltage to the dummy signal electrode. Display device. 8. The display device according to claim 7, wherein the dummy signal electrode is branched into a plurality. 9. The display device according to claim 7, wherein a plurality of the dummy signal electrodes are provided. 10. An electronic apparatus comprising the display device according to claim 1 as display means.