KR20190013138A - Display device - Google Patents

Abstract

The present invention relates to a display device capable of preventing accumulation of a DC voltage. According to the present invention, the display device comprises: a first substrate and a second substrate including a display region and a non-display region surrounding the display region from the outside; a sealing part for attaching the first substrate and the second substrate together; a signal line formed in the non-display region of the first substrate to be more inwardly positioned than the sealing part; and a metal wire overlapped with the signal line.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device. More particularly, the present invention relates to a display device capable of improving contamination poorness and afterimage due to DC voltage (DC) accumulation occurring between a signal line of a non-display area and a common voltage applied to the display area.

BACKGROUND ART [0002] Liquid crystal display devices are becoming increasingly widespread due to features such as light weight, thinness, and low power consumption driving. BACKGROUND ART Liquid crystal display devices are widely used as portable computers such as notebook PCs, office automation devices, audio / video devices, indoor and outdoor advertisement display devices, and the like. The liquid crystal display controls an electric field applied to the liquid crystal layer to modulate light incident from the backlight unit to display an image.

A liquid crystal display device includes an array substrate on which pixels are arranged, a color filter substrate on which color filters and a black matrix are provided, and a liquid crystal layer interposed between the array substrate and the color filter substrate. Each of the pixels of the liquid crystal display modulates light incident from the backlight unit by driving liquid crystal in the liquid crystal layer by an electric field between a data voltage supplied to the pixel electrode and a common voltage supplied to the common electrode.

A manufacturing method of a liquid crystal display device is as follows. A plurality of array substrates are formed on the array mother substrate and a plurality of color filter substrates are formed on the color filter mother substrate. Then, the array mother substrate and the color filter mother substrate are bonded together, and the liquid crystal is injected between the mother substrate and the color filter mother substrate. Then, a plurality of liquid crystal display devices are prepared by cutting the bonded array mother substrate and the color filter mother substrate through a scribing process. [0033] The thin film transistors Or inspection of the pixels, inspection lines may be formed on one side of each of the array substrates. The defect inspection of the pixels can be performed by supplying the driving signals and the data voltages to the inspection lines.

A display area A / A in which an image is implemented and a plurality of pixels are arranged and a non-display area N / A in which an image is not implemented are provided on a first substrate of a conventional general display device. The non-display region N / A may include a pad portion, an inspection switch portion, a connection wiring, a built-in gate driving circuit portion, and the like.

The pixels on the display area A / A receive the driving data signal from the data pad provided in the pad portion and receive the driving gate signal from the gate pad provided in the pad portion. Thereafter, the driving data signal receives an inspection signal from the inspection transistors arranged in the inspection switch unit, and the driving gate signal receives the inspection signal from the internal gate driving circuit unit.

The inspection pad unit may include a high potential power supply pad for supplying a high potential driving voltage to the pixels, a low potential voltage pad for supplying a low potential driving voltage, a gate inspection pad and data inspection pads. The inspection pad unit is electrically connected to a probe inspection apparatus for lighting inspection or an aging apparatus for an aging process, and applies an inspection signal from these to the inspection switch unit and the built-in gate drive circuit unit through each signal line.

As described above, a signal line to which an inspection signal is applied is formed in the non-display area N / A, and the signal line may be connected to a pad unit for applying a signal and a circuit board.

On the other hand, a signal for inspection is applied to the signal line during the cell driving test, and a low potential driving voltage (Vgl) for turning off the transistor in the pixel region is applied during driving of the display panel. These signal lines can form an electric field with the common voltage Vcom continuously applied to the display area A / A as they are positioned in the vicinity of the display area A / A.

When a long-term DC voltage electric field is formed, the charge dispersion is difficult and DC accumulation by the DC voltage electric field occurs.

That is, as the common voltage Vcom is continuously applied to the display region, an electric field is generated between the signal line to which the low-potential driving voltage is applied and the common electrode of the display region, and the DC voltage DC Which may cause problems such as poor contamination and after-image.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the conventional problems described above and it is an object of the present invention to provide a metal wiring for applying a voltage equal to the common voltage Vcom of the display region on a signal line arranged in a non- (DC) accumulation phenomenon and to improve a DC voltage accumulation phenomenon.

According to an aspect of the present invention, there is provided a display device including a first substrate and a second substrate including a display region and a non-display region that surrounds the display region from outside, and a sealing member for bonding the first substrate and the second substrate together, And a signal line formed inside the sealing portion in a non-display region of the first substrate, the signal line being overlapped with the signal line.

Here, the same voltage as the common voltage Vcom applied to the pixel region may be applied to the metal interconnection.

The signal line may be supplied with a low potential driving voltage or a driving signal for inspection for cell driving inspection.

The width of the metal wiring may be equal to or larger than the width of the signal line.

The signal line further includes a first portion, a second portion facing the first portion, and a third portion connecting the first portion and the second portion, wherein the signal line overlaps the third portion of the signal line, Wiring can be formed.

According to the present invention as described above, the following effects can be obtained.

First, a display device according to an exemplary embodiment of the present invention disposes a metal wiring superimposed on a signal line in a non-display area to prevent DC accumulation by a DC voltage electric field.

Second, the display device according to an exemplary embodiment of the present invention can prevent the DC accumulation by the DC voltage electric field, reduce the occurrence of the contamination component adsorption, and improve the after-image defect.

1 schematically shows a signal line and a metal line formed in a display region and a non-display region and a non-display region of a display device according to the present invention.
2 is a cross-sectional view schematically showing a signal line formed in a non-display region of a display device according to the present invention and a metal wiring overlapping with the signal line.
3 is a view schematically showing a signal line and a metal line formed in a display region, a non-display region and a non-display region of a display device according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if the temporal relationship is described by 'after', 'after', 'after', 'before', etc., May not be continuous unless they are not used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 is a cross-sectional view of a signal line 200 and a signal line 200 of a display area A / A and a non-display area N / A and a non-display area N / A of a display device according to the present invention, And a metal wiring 350 formed by the metal wiring 350. FIG. FIG. 2 is a cross-sectional view schematically showing a signal line 200 provided in a non-display area N / A of a display device according to the present invention and a metal wiring 350 formed to overlap with the signal line 200.

Referring to Fig. 1, the display device of the present embodiment is defined as a non-display area N / A that surrounds the display area A / A and the outside of the display area AA.

The first substrate 101 in the display area A / A includes a plurality of gate lines extending in a first direction that is the row direction and crossing the display area A / A, And a plurality of data lines extending in the second direction and crossing the display area (A / A).

In the non-display area N / A, a gate drive circuit (not shown) may be formed on at least one end side of the gate wiring, that is, on one side of the display area A / A. The gate driver circuit (not shown) may be formed in a GIP (gate in panel) method, which is formed directly on the array substrate as the first substrate 101, or in a chip on glass (COG) But is not limited thereto.

The non-display area N / A includes a sealing part 150 for attaching the first substrate 101 and the second substrate 102 of the display device to each other.

Referring to FIGS. 1 and 2, a signal line 200 is formed in the non-display region N / A inwardly of the sealing portion 150. A driving signal for inspection may be applied to the signal line 200 for cell-by-cell driving inspection. In addition, both ends of the signal line 200 may be connected to a pad unit (not shown) and the circuit board 400 to apply a signal.

Data lines GL, gate lines DL, common lines and pixels are provided in the display area A / A of the display device. The data lines cross gate lines and common lines. The data lines may be arranged in the y-axis direction, and the gate lines and the common lines may be arranged in the x-axis direction. Each of the pixels may be connected to a data line, a gate line, and a common line.

The pixel may include a transistor, a pixel electrode 320, a common electrode 300, and a storage capacitor. The transistor is turned on by the gate signal of the gate line to supply the data voltage of the data line to the pixel electrode. The common electrode receives a common voltage from the common line. Therefore, the pixel can adjust the amount of light transmitted from the backlight unit by driving the liquid crystal of the liquid crystal cell by the electric field generated by the potential difference between the data voltage supplied to the pixel electrode and the common voltage supplied to the common electrode. As a result, the pixels can display an image. The storage capacitor is provided between the pixel electrode and the common electrode to maintain a constant voltage difference between the pixel electrode and the common electrode.

1, the pixel electrode 320 includes a plurality of slits and the common electrode 300 is formed in a plate shape. Alternatively, the pixel electrode 320 may be formed in a plate shape, ), And the common electrode may have a plurality of slits for forming a fringe field, and the present invention is not limited thereto.

The signal line 200 may be formed in the same layer as the gate electrode of the display region.

On the other hand, the driving signal for inspection is applied to the signal line 200 at the time of the cell driving inspection, but when driving the liquid crystal display panel, a low potential driving voltage Vgl for turning off the transistor in the pixel region is applied to the signal line 200, Lt; / RTI >

A common electrode for forming an electric field together with the pixel electrode is provided in the display area A / A, and the common voltage Vcom is continuously applied to the common electrode.

The signal line 200 provided in the non-display area can form a DC voltage electric field with the common voltage Vcom continuously applied to the display area A / A as the signal line 200 is positioned in the vicinity of the display area A / have. When a long-term DC voltage electric field is formed, charge dispersion is difficult and DC voltage (DC) accumulation occurs due to DC voltage electric field. That is, as the common voltage Vcom is continuously applied to the display region A / A, the signal line 200 to which the low-potential driving voltage is applied and the common electrode 300 of the display region A / The DC voltage DC is accumulated over time, which may cause problems such as poor contamination and after-images. In order to solve this problem, in this embodiment, the metal wiring 350 is formed by overlapping with the signal line 200 of the non-display area.

The metal wiring 350 is provided to overlap with the signal line 200 to the inside of the display device rather than the sealing part 150. An insulating layer may be provided between the metal line 350 and the signal line 200.

A voltage equal to the common voltage Vcom applied to the display area A / A may be applied to the metal line 350.

Accordingly, the metal wiring 350 of the present invention shields a DC voltage electric field generated between the signal line 200 and the common electrode 300 of the display area A / A, So as to prevent the DC accumulation from occurring due to the DC voltage electric field. Accordingly, the display device according to an exemplary embodiment of the present invention can prevent the DC voltage (DC) accumulation, thereby improving the contamination system failure and the after-image defect.

The metal wiring 350 may be formed on the same layer as the common electrode 300 of the display area A / A. The metal wiring 350 and the common electrode 300 may be formed of indium-tin-oxide (ITO).

Preferably, the metal wiring 350 of the present invention should be formed to be equal to or larger than the width of the overlapping signal line 200. Accordingly, the metal wiring 350 shields a DC voltage electric field generated between the signal line 200 and the common electrode 300 of the display area A / A, It is possible to effectively disperse the DC accumulation amount due to the DC voltage electric field between the signal line 200 and the common electrode 300 of the display area.

As described above, the signal line 200 is positioned inside the sealing portion 150 in the non-display area N / A. More specifically, the signal line 200 according to the present invention includes a first portion and a second portion facing the first portion in a non-display region N / A, and a second portion that connects the first portion and the second portion Three parts. In addition, both ends of the signal line 200 may be connected to a pad unit (not shown) and a circuit board 200 for applying a driving signal.

Referring to FIG. 3, the metal wiring 350 is overlapped with a third portion connecting the first portion and the second portion of the signal line 200.

The first and second portions of the signal line 200 are relatively far apart from the signal line 200 and the display region A / A relative to the third portion, and other signal lines may be formed have. Accordingly, the DC voltage (DC) accumulation phenomenon by the DC voltage magnetic field between the signal line 200 and the common electrode 300 of the display area A / A in the third part of the signal line 200 is greatest When a common voltage Vcom is applied to the metal wiring 350, a DC voltage accumulation phenomenon is generated when the metal wiring 350 is overlapped with the third portion of the signal line 200, Can be most effectively prevented. That is, the metal wiring 350 is preferably formed to overlap with the third portion of the signal line 200.

The first and second portions of the signal line 200 may be overlapped with each other to form the metal wiring 350.

3, the metal wiring 350 overlapped with the signal line 200 may be formed in a closed loop shape surrounding the display area A / A from inside the seal area 150. Referring to FIG.

By forming the metal wiring 350 to be equal to or larger than the width of the overlapping signal line 200, the DC voltage (DC) accumulation by the DC voltage electric field between the signal line 200 and the common electrode of the display area can be effectively .

As described above, it is preferable that a voltage equal to a common voltage applied to the common electrode of the display area A / A is applied to the metal wiring 350. The common voltage Vcom is applied to the metal wiring 350, A common line or a static electricity prevention circuit line formed in the non-display area N / A may be connected to the contact hole through a contact hole, and a common voltage Vcom may be applied by connecting another wire. This is merely an example and is not so limited.

In addition, although the first to third portions in which the signal lines to which the low-potential driving voltage (Vgl) for turning off the transistors in the pixel region are connected during the driving of the display device are described in the drawings, It should be noted that it is possible to further include a pad portion or a separate wiring, and is not limited to the above-described form.

That is, the metal wiring overlapped with the signal line, which is provided for preventing a DC voltage (DC) accumulation phenomenon occurring between the signal line of the non-display area and the common electrode of the display area, is formed in various forms according to the shape of the signal line .

As described above, according to the embodiments of the present invention, the metal wiring to which the same common voltage as the common electrode of the display region is applied is superimposed on the signal line of the non-display region.

Thus, the DC voltage magnetic field generated between the signal line of the non-display area and the common voltage continuously applied to the display area can be prevented, and the problem of DC voltage (DC) accumulation can be also improved.

In addition, it is possible to prevent the DC accumulation by the DC voltage electric field, to reduce the occurrence of the adsorption of the contaminant, and to improve the after-image defect.

The display device according to the present invention may further include a backlight unit. The backlight unit may be disposed under the display panel to illuminate the display panel with light.

The backlight unit may be implemented as a direct type or an edge type.

Although the above-described display device is described as being a liquid crystal display device, it is for convenience of explanation and is not necessarily limited to a liquid crystal display device. For example, the display device according to the present invention may be an organic light emitting display having the structure of the above-described inspection lines.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those precise embodiments and various changes and modifications may be made without departing from the scope of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

101: first substrate
102: second substrate
111, 112: polarizer
150: Sealing part
200: signal line
300: common electrode
320: pixel electrode
350: metal wiring

Claims (10)

A first substrate and a second substrate including a display region and a non-display region surrounding the display region from the outside;
A sealing part for attaching the first substrate and the second substrate together;
A signal line formed inside the sealing portion in the non-display region of the first substrate; And
And a metal wiring superimposed on the signal line.
The method according to claim 1,
And a common electrode provided on the display region,
And the same voltage is applied to the metal wiring and the common electrode.
The method according to claim 1,
And a low-potential driving voltage (Vgl) is applied to the signal line.
The method according to claim 1,
Wherein the width of the metal wiring is equal to or larger than the width of the signal line.
The method according to claim 1,
And a driving signal for inspection for cell driving inspection is applied to the signal line.
The method according to claim 1,
And an insulating layer is formed between the metal wiring and the signal line.
The method according to claim 1,
Wherein the signal line includes a first portion, a second portion facing the first portion, and a third portion connecting the first portion and the second portion.
8. The method of claim 7,
And the metal wiring overlaps with a third portion of the signal line.
The method according to claim 1,
Wherein the metal wiring is formed of ITO.
The method according to claim 1,
Wherein the display region includes a gate electrode,
Wherein the signal line is formed of the same material as the gate electrode.

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