WO2007032313A1 - Liquid crystal display device and electronic device using the same - Google Patents

Liquid crystal display device and electronic device using the same Download PDF

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Publication number
WO2007032313A1
WO2007032313A1 PCT/JP2006/317992 JP2006317992W WO2007032313A1 WO 2007032313 A1 WO2007032313 A1 WO 2007032313A1 JP 2006317992 W JP2006317992 W JP 2006317992W WO 2007032313 A1 WO2007032313 A1 WO 2007032313A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
display device
crystal display
pixel region
capacitor
Prior art date
Application number
PCT/JP2006/317992
Other languages
French (fr)
Japanese (ja)
Inventor
Yusuke Nii
Ken Inada
Original Assignee
Sharp Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2005270814 priority Critical
Priority to JP2005-270814 priority
Application filed by Sharp Kabushiki Kaisha filed Critical Sharp Kabushiki Kaisha
Publication of WO2007032313A1 publication Critical patent/WO2007032313A1/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362Active matrix addressed cells
    • G02F1/136213Storage capacitors associated with the pixel electrode
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/133308LCD panel immediate support structure, e.g. front and back frame or bezel
    • G02F2001/133334Electromagnetic shield
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/04Structural and physical details of display devices
    • G09G2300/0421Structural details of the set of electrodes
    • G09G2300/0426Layout of electrodes and connections
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/06Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation

Abstract

There are provided a liquid crystal device capable of effectively preventing degradation of an image by the electromagnetic noise and an electronic device using the liquid crystal display device. The liquid crystal display device includes a liquid crystal layer sandwiched between a pair of substrates and a pixel region where a plurality of pixels are arranged on the main surface of a first substrate of the pair of substrates, of the liquid crystal layer side. In the pixel region, there are provided scan lines and signal lines arranged to intersect orthogonally, drive elements arranged in the vicinity of the intersections of the scan lines and the signal lines, an pixel electrodes connected to the drive elements. The liquid crystal display device includes a digital-analog conversion circuit for converting an inputted digital video signal into an analog video signal, a signal drive circuit for supplying the analog video signal to the signal lines (5) and capacitance wiring (25) formed on the main surface of the first substrate so as to oppose the signal lines (5) via insulation films (25a, 19).

Description

 Specification

 Liquid crystal display device and electronic apparatus equipped with the same

 Technical field

 TECHNICAL FIELD [0001] The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device mounted on an electronic device that is affected by electromagnetic noise and the electronic device.

 Background art

 Conventionally, liquid crystal display devices have been widely used as displays for mobile phones! / Speak. Recently, with the increase in the communication band of mobile phones (800Z900MHz and 1.4 / 1.5GHz), there is a problem that the image quality of liquid crystal display devices mounted on mobile phones is hindered by electromagnetic noise. It was. Specifically, the image quality of the liquid crystal display device deteriorates due to the electromagnetic wave noise riding on the signal in the power line.

 [0003] In order to solve the above problem, there is a method of forming a noise-cutting capacitor on an FPC (flexible printed circuit board) connected to a liquid crystal panel. It is desirable that the capacitor has a capacity of about several tens of PF. This prevents image quality degradation due to electromagnetic noise. However, with this method, it was necessary to build a capacitor on the FPC. Therefore, there has been a problem that the number of manufacturing steps of the liquid crystal display device increases.

 In order to solve the above-described problem, it has been proposed to provide a capacitor forming electrode so as to face a power supply line that supplies electric power (see Japanese Patent Laid-Open No. 7-120788). According to this capacitance forming electrode, it is possible to prevent electromagnetic wave noise from riding on the signal in the power supply line. Disclosure of the invention

 Problems to be solved by the invention

[0005] However, the invention disclosed in Japanese Patent Laid-Open No. 7-120788 has a problem that high-frequency noise cannot be removed sufficiently. For example, in a liquid crystal panel to which COG (Chip On Glass) technology is applied, the signal lines in the source driver implemented by COG technology are also affected by electromagnetic noise. In other words, in such a liquid crystal panel, the technique proposed in Japanese Patent Laid-Open No. 7-120788 has a problem of high frequency noise. The effect could not be completely removed.

 In view of the above problems, an object of the present invention is to provide a liquid crystal display device that can more effectively prevent deterioration of image quality due to electromagnetic noise, and an electronic device including the liquid crystal display device.

 Means for solving the problem

 In order to achieve the above object, a liquid crystal display device according to the present invention includes a pair of substrates, a liquid crystal layer sandwiched between the pair of substrates, and a first of the pair of substrates. A liquid crystal display device having a pixel area in which a plurality of pixels are arranged on a main surface of the substrate on the liquid crystal layer side, wherein scanning lines and signals arranged in the pixel area are orthogonal to each other. A digital analog that converts an input digital video signal into an analog video signal, and a driving element disposed near an intersection of the scanning line and the signal line; and a pixel electrode connected to the driving element. A capacitor line formed on the main surface of the first substrate so as to be opposed to the signal line through an insulating material, the signal line driving circuit including a conversion circuit and supplying the analog video signal to the signal line And comprising .

 [0008] According to this configuration, the capacitor is formed by the capacitive wiring formed on the main surface of the first substrate so as to face the signal line with the insulating material interposed therebetween. As a result, a CR filter is equivalently formed by the resistance of the signal line and this capacitor, so that the impedance of the signal line is lowered and high frequency noise generated in the signal line is reduced. Therefore, the level fluctuation of the analog video signal supplied to the pixel area by the signal line driving circuit power signal line is suppressed, and deterioration of the image quality in the pixel area can be prevented.

 According to the present invention, it is possible to realize a liquid crystal display device that can more effectively prevent image quality deterioration due to electromagnetic wave noise, and an electronic apparatus including the liquid crystal display device.

 Brief Description of Drawings

 FIG. 1 is a cross-sectional view (a cross-sectional view taken along line AA in FIG. 3) showing a configuration of an active matrix substrate included in a liquid crystal display device according to an embodiment of the present invention. .

 FIG. 2 is a plan view of an active matrix substrate provided in a liquid crystal display device according to one embodiment of the present invention.

[FIG. 3] FIG. 3 corresponds to one pixel in the column closest to the source driver in the pixel region. It is a top view which shows the structure of a part and its peripheral part.

 FIG. 4 is a cross-sectional view taken along line B-B shown in FIG.

 FIG. 5 is a cross-sectional view taken along the line CC of FIG. 3.

 FIG. 6 is a plan view showing a schematic configuration of a mobile phone as an electronic apparatus according to an embodiment of the present invention.

 FIG. 7 is a view showing a modification of the present invention, and is a plan view showing a state in which the capacitor wiring is formed in an island shape.

 BEST MODE FOR CARRYING OUT THE INVENTION

The liquid crystal display device according to the present invention includes a pair of substrates, a liquid crystal layer sandwiched between the pair of substrates, and a main substrate on the liquid crystal layer side of the first substrate that is one of the pair of substrates. A liquid crystal display device having a pixel region in which a plurality of pixels are arranged on the surface, wherein a scanning line and a signal line arranged in the pixel region so as to be orthogonal to each other, and in the vicinity of an intersection of the scanning line and the signal line And a pixel electrode connected to the drive element, and includes a digital analog conversion circuit that converts an input digital video signal into an analog video signal, and the analog video signal is converted into the signal. A signal line driving circuit to be supplied to the line, and a capacitor wiring formed on the main surface of the first substrate so as to face the signal line through an insulating material.

 [0012] In the above configuration, it is preferable that the capacitor portion is a capacitor wiring extending substantially in parallel with a direction in which a signal line extends in the pixel region. Preferably, the structure further includes a counter electrode on a main surface on the liquid crystal layer side of the second substrate which is the other of the pair of substrates, and the capacitor wiring is electrically connected to the counter electrode. Preferred to be connected to. This is because the capacitor wiring, which is one electrode of the capacitor, can be held at the potential (reference potential) of the counter electrode.

 [0013] In the above structure, it is preferable that the capacitor portion is provided between the signal line driver circuit and the pixel region. This is because electromagnetic wave noise can be effectively removed from the analog video signal supplied to the pixel area.

[0014] In the above configuration, the pixel region further includes an auxiliary capacitance wiring for forming an auxiliary capacitance with the pixel electrode, and the capacitance portion is made of the same material as the auxiliary capacitance wiring. It is preferable that it was formed with a material. By forming the auxiliary capacitance wiring and the capacitance portion with the same material, it is also possible to suppress an increase in manufacturing cost. In addition, it is possible to form the auxiliary capacitance wiring and the capacitance portion by the same process.

 [0015] In the above configuration, it is preferable that the capacitor portion is formed of a metal capable of anodic oxidation. This is because an insulating film can be formed on the capacitor portion by anodic acid.

 [0016] The above configuration may be an aspect in which the signal line driver circuit is mounted on the first substrate by a COG method. Alternatively, the signal line driving circuit may be a so-called monolithic type liquid crystal display device formed on the first substrate by a process common to at least a part of the pixel region forming process. . Further, all of the driver circuits including the signal line driver circuit are so-called full monolithic liquid crystal display devices formed on the first substrate by a process common to at least a part of the pixel region formation process. There may be. In the above structure, it is preferable that continuous grain crystal silicon is used for the pixel region of the first substrate.

 [0017] The present invention is an electronic device including a liquid crystal display device having any one of the above-described configurations, for example, a mobile phone or a portable information terminal having a communication function.

 Hereinafter, specific embodiments of the liquid crystal display device of the present invention will be described with reference to the drawings. The liquid crystal display device according to the present embodiment is particularly suitable for a display for a portable information terminal such as a mobile phone or a PDA (Personal Digital Assistance) with a communication function. The application is not limited to these.

 FIG. 2 is a schematic plan view of the active matrix substrate 10 of the liquid crystal display device that works on the present embodiment. As shown in FIG. 2, the active matrix substrate 10 in the present embodiment has a pixel region 4 (described later) formed on a glass substrate 1. The liquid crystal display device according to this embodiment is a full monolithic liquid crystal display using CG silicon (continuous grain boundary crystal silicon). That is, on the glass substrate 1 around the pixel region 4, the gate driver 2, the source dryer, the power supply circuit and other control circuits (none of which are shown) are monolithically formed.

A gate line 6 is drawn from the gate driver 2 to the pixel region 4, and a source line 5 is drawn from the source driver 3 force to the pixel region 4. In Figure 2, the “...” symbol is used. The number of gate lines 6 is the same as the number of vertical pixels in the pixel region 4, and the number of source lines 5 is the same as the number of pixels in the horizontal direction in the pixel region 4. . The gate line 6 and the source line 5 are arranged so as to be orthogonal to each other in the pixel region 4 (see FIG. 3).

Hereinafter, the structure of the pixel region 4 in the active matrix substrate 10 will be described in detail with reference to FIGS. FIG. 3 is a plan view showing the structure corresponding to one pixel in the column closest to the source driver 3 in the pixel region 4 and the structure of the periphery thereof. 4 is a cross-sectional view taken along the line B-B shown in FIG. 3, and FIG. 5 is a cross-sectional view taken along the line C-C shown in FIG.

As shown in FIG. 3, a TFT 11 is formed in the vicinity of the intersection of the gate line 6 and the source line 5 arranged so as to be orthogonal to each other in the pixel region 4. The TFT 11 has a gate electrode 12 connected to the gate line 6 and a source electrode 13 connected to the source line 5. The drain electrode 14 of the TFT 11 is connected to the pixel electrode 18 via the drain wiring 15 and the contact hole 17. In the pixel region 4, an auxiliary capacitor wiring 16 is formed in parallel with the gate line 6.

 Here, the structure of the pixel region 4 will be described together with the outline of the manufacturing process with reference to FIGS. 3 to 5 as appropriate. First, as shown in FIG. 4, on a glass substrate 1, for example, a tantalum (Ta), aluminum (A1), or a single layer film having an equal force of molybdenum (Mo) or a multilayer film in which these layers are stacked is laminated by sputtering. Then, the gate line 6 and the gate electrode 12 are formed by patterning into a desired shape by photolithography and etching. The gate electrode 12 is patterned at the same time as the gate line 6 as a branch line of the gate line 6 as shown in FIG. At the same time as the formation of the gate line 6 and the gate electrode 12, the auxiliary capacitance wiring 16 is formed on the glass substrate 1 by the same process using the same material as these (see FIG. 5).

Next, as shown in FIG. 4, an insulating film 12 a is formed on the gate line 6 and the gate electrode 12. At the same time, as shown in FIG. 5, the insulating film 16a is formed in the upper layer of the auxiliary capacitance wiring 16 by using the same material as the insulating film 12a. As the material for the gate line 6, the gate electrode 12, and the auxiliary capacitance wiring 16, the above tantalum, aluminum, Alternatively, when a metal capable of anodic oxidation such as molybdenum is used, the insulating film 12a and the insulating film 16a are obtained by anodizing the surfaces of the gate electrode 12 and the auxiliary capacitance wiring 16.

 Next, as shown in FIGS. 4 and 5, the upper layers of the gate line 6, the gate electrode 12, the insulating film 12a, the auxiliary capacitance wiring 16, and the insulating film 16a are not formed. A gate insulating film 19 (silicon nitride film or silicon oxide film) is formed by plasma CVD so as to cover the surface of the glass substrate 1.

 Then, as shown in FIG. 4, a semiconductor layer 20 and a contact layer 21 are sequentially formed on the gate insulating film 19. Further, ITO (Indium Tin Oxide), tantalum, or aluminum is deposited on the contact layer 21 by sputtering and patterned into a desired shape, whereby the source electrode 13, the source line 5, the drain electrode 14, and Drain wiring 15 is formed. At this time, the drain wiring 15 is extended to a position reaching the upper layer of the auxiliary capacitance wiring 16.

 Next, as shown in FIGS. 4 and 5, the TFT 11, the source line 5, the drain wiring 15, and the gate insulating film 19 are covered with a silicon compound such as silicon nitride so as to cover the TFT 11. A protective film 23 is formed for the purpose of protecting the TFT 11. Furthermore, for the purpose of ensuring insulation on the upper layer of the protective film 23 and flattening the step at the location where the TFT 11 is formed, the interlayer insulating film 24 is used using, for example, acrylic resin. Is formed. Then, a pixel electrode 18 is formed on the surface of the interlayer insulating film 24 using a metal such as ITO, tantalum, or aluminum. However, in the case of a transmissive or transflective liquid crystal display device using a knock light, it is necessary to use a transparent metal such as cocoon as the material of the pixel electrode 18.

 As shown in FIG. 3, a contact hole 17 is formed in a portion of the interlayer insulating film 24 corresponding to the upper layer of the auxiliary capacitance wiring 16 and the drain wiring 15. Then, at the bottom of the contact hole 17, the pixel electrode 18 is electrically connected to a drain wiring 15 (see FIGS. 3 and 4) extending from the drain electrode 14.

[0029] Through the above manufacturing process, the pixel region 4 of the active matrix substrate 10 which is effective in the present embodiment is configured. [0030] FIG. 1 is a cross-sectional view taken along line AA in FIG. As shown in FIG. 1, in the active matrix substrate 10 of the liquid crystal display device according to the present embodiment, a glass substrate is provided in the region between the source driver 3 and the pixel region 4 (region P shown in FIGS. 2 and 3). A capacitor wiring 25 is arranged on the surface of 1 so as to face the source line 5. As shown in FIG. 3, the capacitor wiring 25 is arranged substantially parallel to the auxiliary capacitor wiring 16 in the pixel region 4.

 The capacitor wiring 25 is formed by the same process using the same material as the gate line 6, the gate electrode 12, and the auxiliary capacitor wiring 16. That is, for example, a tantalum, aluminum, molybdenum, or other single layer film or a multilayer film formed by stacking these layers is laminated on the glass substrate 1 by sputtering and patterned into a desired shape by photolithography and etching. The capacitor line 25 can be formed simultaneously with the gate line 6, the gate electrode 12, and the auxiliary capacitor line 16.

 An insulating film 25 a is formed on the upper layer of the capacitor wiring 25. When a metal capable of anodization such as tantalum, aluminum, or molybdenum is used as the material of the capacitor wiring 25, the insulating film 25a is obtained by anodizing the surface of the capacitor wiring 25. The For example, when the capacitor wiring 25 is formed of tantalum, the insulating film 25a is formed of tantalum oxide (Ta 2 O 3).

 twenty five

 Then, as shown in FIG. 1, a gate insulating film 19 is extended over the insulating film 25a (see FIGS. 4 and 5). Further, as shown in FIG. 1, the source line 5 is disposed above the capacitor wiring 25 and the insulating film 25a via the gate insulating film 19 (see FIG. 4). A protective film 23 and an interlayer insulating film 24 are formed on the source line 5 (see FIG. 4). The capacitor wiring 25 is electrically connected to a counter electrode of a counter substrate (not shown) outside the active matrix substrate 10.

[0034] In this manner, by disposing the capacitor wiring 25 via the gate insulating film 19 and the insulating film 25a at a position facing the source line 5, the source line 5 and the capacitor wiring 25 are used as electrodes, and gate insulation is performed. A capacitor using the film 19 and the insulating film 25a as a dielectric is formed. The capacitance wiring 25 is held at the potential of the counter electrode (reference potential) by being connected to the counter electrode as described above. As a result, a CR filter is equivalently formed by the resistance of the source line 5 and the capacitor, so that the impedance of the source line 5 is low. The high frequency noise generated in the source line 5 is reduced. Therefore, the level fluctuation of the analog video signal supplied to the pixel area 4 by the source driver 3 and the source line 5 is suppressed, and deterioration of the image quality in the pixel area 4 can be prevented.

 It should be noted that the capacitance of the capacitor formed by the source line 5 and the capacitor wiring 25 is effective in reducing high frequency noise according to the communication frequency band of a mobile phone or the like to which the liquid crystal display device of the present embodiment is applied. It is preferable to appropriately set the thickness, width, etc. of the capacitor wiring 25 so that the value can be suppressed to a low level.

 For example, assuming that the frequency band in which noise is desired to be cut is 900 MHz, the cut-off frequency fc is expressed by the following equation (1). C is the capacitance of the capacitor formed by the source line 5 and the capacitor wiring 25, and R is the resistance value.

 [0037] fc = l (2paiX CR) · · · · (1)

Here, when the resistance (horizontal component) of the capacitor wiring 25 is about 500 Ω, if R = 500 Ω, C = 0.354 pF from the above equation (1). Here, the dielectric constant ε of the organic material to be formed in the gate insulating film 19 form a 53. 7 chi 10_ about 9. Further, since the film thickness d of the above capacitor is almost equal to the capacitance selfish wire 25, d = 4.1 μm. The relationship of the following formula (2) holds between C, S, and d.

 [0038] C = ε X (S / d) · · · (2)

By applying the above C, ε, d to the above equation (2), S = 29 X 10 _12 m 2 . C is formed by these couplings at the position where the source line 5 and the capacitor wiring 25 intersect (see FIG. 3). Therefore, when the short side of the capacitor electrode is the line width of the source line 5 (for example, 9 m), when S is the above value, the length of the long side of the capacitor electrode (ie, the capacitance line 25) It can be seen that the width should be about 3.2 m.

As described above, the liquid crystal display device according to the present embodiment is disposed on the surface of the glass substrate 1 between the source driver 3 and the pixel region 4 via the insulating layer so as to face the source line 5. Since the capacitance wiring 25 is formed, this portion substantially functions as a capacitor, so that high frequency noise generated in the source line 5 can be reduced and image quality deterioration in the pixel region 4 can be prevented. In addition, the capacitor wiring 25 and the insulating film 25a are formed in the pixel region 4 as described above. Since the gate electrode 12, the gate line 6, and the auxiliary capacitor wiring 16 and the insulating film thereof and the insulating film thereof can be formed by the same material and the same process, there is an advantage that the manufacturing cost is not increased.

FIG. 6 is a plan view showing a schematic configuration of a mobile phone as an embodiment of the electronic apparatus according to the invention. As shown in FIG. 6, the mobile phone 30 is provided with a liquid crystal display device that can perform the above-described embodiment as a display 31. Note that the mobile phone 30 shown in FIG. 6 may be implemented with the electronic apparatus according to the present invention as a mobile phone having a plurality of displays, which is configured to include only one display. In addition, the electronic device according to the present invention is not limited to a mobile phone and can be widely applied to a portable information terminal having a communication function.

 [0041] The embodiment of the present invention is not limited to the above-described configuration, and various modifications can be made within the scope of the invention.

 For example, in the above description, a configuration in which the capacitor wiring 25 for forming the capacitor is extended in a direction orthogonal to the source line 5 (that is, a direction parallel to the gate line 6 and the auxiliary capacitor wiring 16). Illustrated. However, in addition to this, as shown in FIG. 7, by separating the capacitor wiring 25 so that the portion facing the source line 5 remains in the shape of an island in 25 cm of the capacitor wiring, it is separated for each source line. Alternatively, a capacitor 25d may be formed.

 In the above description, the configuration in which all of the drive circuits and the like are monolithically formed on the glass substrate 1 by a semiconductor process when forming the pixel region 4 (so-called full monolithic panel) is illustrated. However, the present invention can also be applied to a configuration in which only a part of the drive circuit is monolithically formed.

 Alternatively, the present invention can also be applied to a configuration in which the gate driver 2 and the source driver 3 are mounted on the glass substrate 1 by COG (Chip On Glass) technology. Alternatively, the present invention can also be applied to a configuration in which the gate driver 2 and the source dryer 3 are mounted by the TCP (Tape Carrier Package) method.

 Industrial applicability

The present invention can be used as a liquid crystal display device that can more effectively prevent deterioration in image quality due to electromagnetic noise, and an electronic apparatus equipped with the liquid crystal display device.

Claims

The scope of the claims
 [1] A plurality of pixels are arranged on a main surface on the liquid crystal layer side of a pair of substrates, a liquid crystal layer sandwiched between the pair of substrates, and a first substrate that is one of the pair of substrates. A liquid crystal display device having a pixel region,
 A scanning line and a signal line arranged in the pixel region so as to be orthogonal to each other, a driving element arranged in the vicinity of an intersection of the scanning line and the signal line, and a pixel electrode connected to the driving element Provided,
 A digital-to-analog conversion circuit that converts an input digital video signal into an analog video signal; and a signal line driving circuit that supplies the analog video signal to the signal line, so as to face the signal line through an insulating material A liquid crystal display device comprising: a capacitor formed on a main surface of the first substrate.
 [2] The liquid crystal display device according to [1], wherein the capacitor portion is a capacitor line extending substantially parallel to a direction in which a signal line is drawn in the pixel region.
[3] The main surface on the liquid crystal layer side of the second substrate which is the other of the pair of substrates has a counter electrode,
 3. The liquid crystal display device according to claim 2, wherein the capacitor wiring is electrically connected to the counter electrode.
 [4] The capacitor section is formed in an island shape at a location facing the signal line.
The liquid crystal display device according to 1.
[5] The capacitor section is provided between the signal line driver circuit and the pixel region.
The liquid crystal display device according to any one of 1 to 4.
 [6] The pixel region further includes an auxiliary capacitance line for forming an auxiliary capacitance with the pixel electrode,
 6. The liquid crystal display device according to claim 1, wherein the capacitor portion is formed of the same material as the auxiliary capacitor wiring.
[7] The liquid crystal display device according to any one of [1] to [6], wherein the capacitor portion is formed of a metal capable of anodic oxidation.
[8] The signal line drive circuit is mounted on the first substrate by a COG method.
The liquid crystal display device according to any one of 7 to 7.
[9] The liquid crystal according to any one of claims 1 to 7, wherein the signal line driving circuit is formed on the first substrate by a process common to at least a part of a process of forming the pixel region. Display device.
 10. The liquid crystal display device according to claim 1, wherein continuous grain boundary crystalline silicon is used for the pixel region of the first substrate.
[11] An electronic device comprising the liquid crystal display device according to any one of claims 1 to 10.
[12] The electronic device according to claim 11, which is a mobile phone or a mobile information terminal having a communication function.
PCT/JP2006/317992 2005-09-16 2006-09-11 Liquid crystal display device and electronic device using the same WO2007032313A1 (en)

Priority Applications (2)

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JP2005270814 2005-09-16
JP2005-270814 2005-09-16

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63175832A (en) * 1987-01-16 1988-07-20 Hosiden Electronics Co Ltd Active matrix liquid crystal display device
JPH07104315A (en) * 1993-09-30 1995-04-21 Sanyo Electric Co Ltd Liquid crystal display device
JPH08114817A (en) * 1994-10-14 1996-05-07 Toshiba Corp Liquid crystal display device
JP2003323162A (en) * 2002-05-02 2003-11-14 Sony Corp Display and driving method of the same, and portable terminal device
JP2005077635A (en) * 2003-08-29 2005-03-24 Seiko Epson Corp Electro-optical device and electronic apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63175832A (en) * 1987-01-16 1988-07-20 Hosiden Electronics Co Ltd Active matrix liquid crystal display device
JPH07104315A (en) * 1993-09-30 1995-04-21 Sanyo Electric Co Ltd Liquid crystal display device
JPH08114817A (en) * 1994-10-14 1996-05-07 Toshiba Corp Liquid crystal display device
JP2003323162A (en) * 2002-05-02 2003-11-14 Sony Corp Display and driving method of the same, and portable terminal device
JP2005077635A (en) * 2003-08-29 2005-03-24 Seiko Epson Corp Electro-optical device and electronic apparatus

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