KR20050094639A - Liquid crystal display panel including driving circuit incorporated therein and liquid crystal display having the same - Google Patents

Abstract

In the liquid crystal display, the upper substrate is coupled to a display unit for displaying an image and a lower substrate having a driver unit provided around the display unit to provide a driving signal to the display unit with the liquid crystal layer interposed therebetween. The upper substrate may include a color filter, a first insulating film having a concave portion, a common electrode, and a second insulating film provided on the common electrode to correspond to the concave portion and the driving portion of the first insulating layer to reduce parasitic capacitance generated at the common electrode and the gate driver. Include. Therefore, malfunction of the drive unit can be prevented.

Description

Substrate and liquid crystal display device for a liquid crystal display device with a built-in drive circuit TECHNICAL FIELD

The present invention relates to a substrate for a liquid crystal display and a liquid crystal display having the same, and more particularly, to a liquid crystal display having a drive circuit and a liquid crystal display having the same.

A general liquid crystal display device includes a lower substrate, an upper substrate, and a liquid crystal layer interposed between the upper substrate and the lower substrate. The liquid crystal display displays an image by changing an arrangement of liquid crystal molecules of a liquid crystal layer by adjusting an electric field formed between an upper substrate and a lower substrate by an external signal.

The liquid crystal display also consists of a display area and a peripheral area around it.

In the display area of the lower substrate, a plurality of pixel electrodes are provided in a matrix form along with a plurality of gate lines and a plurality of data lines that cross each other. The pixel electrode is connected to the gate line and the data line through a thin film transistor (hereinafter referred to as "TFT").

In the peripheral region, a gate driving circuit for applying a driving voltage to the gate line is provided, and the gate driving circuit is usually formed by a process for forming a TFT.

Meanwhile, the upper substrate is provided with a common electrode facing the pixel electrode with the liquid crystal layer interposed therebetween. The common electrode extends to the peripheral area and faces the gate driving circuit with the liquid crystal layer interposed therebetween.

For this reason, parasitic capacitance is produced between the gate drive circuit and the common electrode, and mutual interference occurs. Such parasitic capacitance interference distorts or delays the signal output from the gate driving circuit, thereby degrading the display characteristics of the liquid crystal display device 40.

In addition, when a physical external force is applied to the peripheral area of the liquid crystal display, the common electrode 24 and the gate driving circuit 16 are shorted, causing malfunction of the gate driving circuit 16.

Accordingly, an object of the present invention is to provide a liquid crystal display substrate for preventing malfunction of the gate driver.

In addition, another technical problem of the present invention is to provide a liquid crystal display device having such a substrate.

According to an aspect of the present invention, a substrate for a liquid crystal display device includes a display unit configured to include an image of a transmissive region and a reflective region, and a lower substrate having a driving unit provided around the display unit to provide a driving signal to the display unit. The image is displayed through the liquid crystal layer therebetween.

The upper substrate may be provided on the common electrode to correspond to a first insulating layer having a recess, a common electrode formed on the first insulating layer, a recess of the first insulating layer, and a portion of the driving unit. It includes a second insulating film for reducing the parasitic capacitance generated in the driver.

In addition, the liquid crystal display according to another aspect of the present invention, the lower substrate and the upper substrate having a display unit consisting of a transmissive region and a reflective region for displaying an image and a driving unit provided around the display unit to provide a driving signal to the display unit. And a liquid crystal layer interposed between the lower substrate and the upper substrate.

The upper substrate may be provided on the common electrode to correspond to a first insulating layer having a recess, a common electrode formed on the first insulating layer, a recess of the first insulating layer, and a portion of the driving unit. And a second insulating film for reducing parasitic capacitance generated by the driver.

According to the upper substrate and the liquid crystal display having the same, the upper substrate includes a first insulating film having a concave portion, a common electrode formed on the first insulating layer, and a concave portion and a gate of the first insulating layer provided on the common electrode. A second insulating film corresponding to the first region of the driving circuit may be provided to reduce the parasitic capacitance generated between the common electrode and the gate driving circuit, thereby preventing the gate driving circuit from malfunctioning.

In addition, the coupling member interposed between the upper substrate and the lower substrate to couple the upper substrate and the lower substrate may correspond to the second region of the gate driving circuit except the first region according to the bonding margin.

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" (or "on") another part, this includes not only the other part "right on" but also another part in the middle. . On the contrary, when a part is "just above" another part, there is no other part in the middle.

1 is a schematic plan view of a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view of the liquid crystal display.

Referring to FIG. 1, the liquid crystal display device 400 according to an exemplary embodiment of the present invention may include a lower substrate 100, an upper substrate 200 facing the lower substrate 100, and a lower substrate 100 and an upper substrate ( It includes a liquid crystal layer 300 interposed between the 200.

The liquid crystal display 400 also includes a display area DA for displaying an image and a peripheral area PA around the display area DA.

The display area DA is provided with a plurality of gate lines GL and a plurality of data lines DL that cross each other. The gate line GL and the data line DL divide the liquid crystal display into a plurality of pixel areas arranged in a matrix form, and each pixel area is formed of a reflection area RA and a transmission area TA. In the pixel area, the circuit 110 includes a TFT 110, which is a switching element, and a liquid crystal capacitor C _LC and a storage capacitor C _ST connected thereto.

The pixel region includes a TFT 110, which is a switching element, and a liquid crystal capacitor C _LC and a storage capacitor C _ST connected thereto. One electrode of the gate line GL and the data line DL, the TFT 110, the storage capacitor C _ST , and the liquid crystal capacitor C _LC is positioned on the lower substrate 100, and the liquid crystal capacitor C _LC The other electrode is located on the upper substrate 200, and the liquid crystal is mainly filled between the two electrodes of the liquid crystal capacitor C _LC .

The peripheral area PA is provided with a gate driving circuit 160 and a data driving circuit (not shown).

Next, the lower substrate 100 and the upper substrate 100 will be described in more detail.

A plurality of gate lines GL and a plurality of data lines DL are formed in the lower substrate 100, and TFTs 110 and TFTs connected to the data lines DL and the gate lines GL are respectively formed in the pixel regions. The pixel electrode 120 coupled to the 110 is provided.

The TFT 110 includes a gate electrode 111 connected to the gate line GL, a source electrode 115 connected to the data line DL, and a drain electrode 116 connected to the pixel electrode 120. . A gate insulating layer 112 is formed between the gate electrode 111 and the source and drain electrodes 115 and 116, and the connection between the drain electrode 116 and the pixel electrode 120 is performed by the TFT 110 and the pixel electrode ( It is formed through the contact hole 131 formed in the passivation layer 130 stacked between the 120 and exposing the drain electrode 116.

The pixel electrode 120 forms one electrode of the liquid crystal capacitor C _LC and the storage capacitor C _ST and receives a voltage from the TFT 110. The pixel electrode 120 includes a transparent electrode 107 and a reflective electrode 109 thereon, and the reflective electrode 109 has a transmission window in the transmission area TA to expose the transparent electrode 107 below. Let's do it. The transparent electrode 107 is made of indium tin oxide (ITO) or indium zinc oxide (IZO), which is a transparent conductive material, and the reflective electrode 109 is made of aluminum (Al), aluminum alloy (Al Alloy), silver (Ag), and the like. Or a reflective metal such as silver alloy.

The peripheral area PA of the lower substrate 100 includes a gate driving circuit 160 connected to one end of the gate line GL and outputting a gate driving signal to the gate line GL. In addition, the peripheral area PA includes a data driving circuit (not shown) connected to one end of the data line DL and outputting a data signal to the data line DL. The gate driving circuit 160 is formed by the same process as the TFT 110 in the display area DA.

The upper substrate 200 includes a light blocking film 223, a color filter 219, a first insulating film 217, a common electrode 215, and a second insulating film 213.

The color filter 219 includes red, blue, and green color filters, which express the corresponding color by light and are formed in the pixel area, respectively. In the color filter 219, the light hole 221 is formed in the portion corresponding to the reflective area RA to increase the luminance of the reflective area RA.

The light blocking film 223 is formed to surround the pixel area or the color filter 219, and faces the gate driving circuit 160 in the peripheral area PA.

The first insulating layer 217 is formed on the color filter 219 and has a recess located in the reflective region RA to expose the light hole 221 and the portion of the color filter 219 surrounding the light hole 221. In addition, the first insulating layer 217 may include a portion filled in the light hole 221 of the color filter 219, and the portion filled in the light hole 221 may planarize the surface of the color filter 219 to form a hole ( Reduce the step that can be formed by 221.

The common electrode 215 forms the other electrode of the liquid crystal capacitor C _LC and receives a common voltage from the outside. The common electrode 215 is formed to have a predetermined thickness on the upper portion of the first insulating layer 217 and the exposed color filter 219.

The second insulating layer 213 is formed on the common electrode 215. In the display area DA, the second insulating layer 213 is positioned on the display region 213a and the peripheral area PA positioned on the recess of the first insulating layer 217. It includes the peripheral area portion 213b. The heights of the surface of the display region 213a of the second insulating film 213 and the surface of the common electrode 215 are substantially the same, and the thickness of the peripheral region 213b of the second insulating film 213 is greater than that of the display region 213b. It can be thick.

The second insulating layer 213 is preferably made of a material having a dielectric constant smaller than that of the liquid crystal layer 300. For example, the second insulating layer 213 may be formed of an organic insulating layer such as acrylic resin or polyimide resin.

In this way, the distance between the reflective electrode 109 of the lower substrate 100 and the common electrode 215 of the upper substrate 200 in the reflective region RA and the transmission of the lower substrate 100 in the transmission region TA. The distance between the electrode 107 and the common electrode 215 of the upper substrate 200 is different. In addition, since the second insulating film 213 is present between the reflective electrode 109 and the common electrode 215 in the reflective region RA, a portion of the liquid crystal layer 300 of the reflective region RA (hereinafter referred to as “reflective region portion”). The reflection region voltage applied to the ”is smaller than the transmission region voltage applied to the liquid crystal layer 300 (hereinafter, referred to as a“ transmission region portion ”) of the transmission region TA. In this case, the smaller the dielectric constant of the second insulating layer 213 is, the lower the reflection region voltage is. As such, different voltages are applied to the reflective region of the liquid crystal layer 300 positioned in the reflective region RA and the reflective region of the liquid crystal layer 300 disposed in the transmissive region TA, thereby improving both reflectance and transmittance. Can be.

Meanwhile, the portion 213b of the second insulating layer 213 positioned in the peripheral area PA is interposed between the common electrode 215 and the gate driving circuit 160 to partially overlap the gate driving circuit 160.

The lower substrate 100 and the upper substrate 200 are firmly coupled by a sealant 350 provided in the peripheral area PA. The coupling member 350 covers only a part of the gate driving circuit 160. In FIG. 2, the coupling member 350 covers the second region B2, which is outside the first region B1 where the second insulating layer 213 is located. The coupling member 350 may be made of a material having a dielectric constant smaller than that of the liquid crystal layer 300.

The liquid crystal layer 300 is injected into the coupling member 350 and does not exist in the second region B2 of the gate driving circuit 160 where the coupling member 350 is formed.

As such, the second insulating layer 213 and the coupling member 350 are electrically generated between the common electrode 215 and the gate driving circuit 160 while electrically insulating the common electrode 215 and the gate driving circuit 160. Reduces parasitic doses. That is, since the dielectric constant of the second insulating layer 213 and the coupling member 350 is smaller than that of the liquid crystal layer 300, the parasitic capacitance is reduced than that of the liquid crystal layer 300. By doing in this way, the malfunction of the gate drive circuit 160 can be prevented.

3A to 3D are cross-sectional views illustrating a manufacturing process of an upper substrate of the liquid crystal display shown in FIG. 2.

Referring to FIG. 3A, chromium oxide (CrO ₂ ) may be formed on the upper substrate 200. Alternatively, an organic black matrix (BM) layer is stacked and patterned to form the light blocking film 223.

Subsequently, red, green, and blue color filters 219 having light holes 221 are formed on the upper substrate 200. As described above, the light blocking film 223 is interposed between the color filters 219. At this time, since the thickness of the light blocking film 223 is smaller than the thickness of the color filter 219, a step is generated between the light blocking film 223 and the color filter 219.

Next, referring to FIG. 3B, a first insulating film 217 made of an organic film of photosensitive resin is formed. The first insulating layer 217 includes a portion positioned in the transmission area TA and a portion filled in the light hole 221 of the color filter 219. By filling the light holes 221 as described above, the level difference that may be generated by the light holes 221 may be reduced to planarize the surface of the color filter 219.

Thereafter, the common electrode 215 made of ITO or IZO is stacked on the first insulating layer 217 and the color filter 219 with a uniform thickness.

Referring to FIG. 3C, a second insulating film 213 made of acrylic resin or polyimide resin is formed to have a predetermined thickness using photosensitive resin.

The second insulating layer 213 is a recessed portion of the first insulating layer 217, that is, the display region 213a positioned in the reflective region RA, the common electrode 215 of the upper substrate 200, and the lower substrate 110. The peripheral region portion 231b is disposed on the first region B1 of the gate driving circuit 160 (shown in FIG. 2) to reduce the parasitic capacitance generated between the gate driving circuit 160 and the gate driving circuit 160.

Referring back to FIG. 2, the completed upper substrate 200 is aligned with the lower substrate 100 in a state where the coupling member 350 is interposed in the peripheral area PA, and pressed or heated to form the upper substrate 200 and the lower substrate. The substrate 100 is bonded to the coupling member 350.

The coupling member 350 may be formed where the peripheral region 213b of the second insulating layer 213 is not present among the peripheral regions PA to cover the second region B2 of the gate driving circuit 160.

As such, the second insulating layer 213 electrically insulates the common electrode 215 from the gate driving circuit 160, and reduces the parasitic capacitance generated between the common electrode 215 and the gate driving circuit 160.

In addition, the second insulating layer 213 and the coupling member 350 may be disposed to cover or cover the first region B1 and the second region B2 of the gate driving circuit 160, respectively.

According to such an upper substrate and a liquid crystal display having the same, the upper substrate includes a second insulating layer provided on the common electrode and corresponding to the gate driving circuit region. Alternatively, the second insulating layer corresponding to the first region of the gate driving circuit on the common electrode of the upper substrate, and the coupling member interposed between the upper substrate and the lower substrate to bond the upper substrate and the lower substrate may include the first region. It may correspond to the second region of the gate driving circuit except for the above.

Accordingly, the second insulating film or the second insulating film and the coupling member electrically insulate the common electrode and the gate driving circuit, thereby reducing the parasitic capacitance generated between the common electrode and the gate driving circuit. This can prevent the gate driving circuit from malfunctioning.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a schematic plan view of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of the liquid crystal display shown in FIG. 1.

3A to 3C are cross-sectional views illustrating a manufacturing process of the upper substrate illustrated in FIG. 2.

<Explanation of symbols for main parts of the drawings>

100: lower substrate 160: gate driving circuit

107: transparent electrode 109: reflective electrode

110: TFT 200: upper substrate

213: second insulating film 215: common electrode

217: First insulating film 219: Color filter

300: liquid crystal layer 350: bonding member

400: liquid crystal display

Claims (8)

A substrate for a liquid crystal display device with a built-in drive circuit, Color filter, A first insulating film formed on the color filter and having a concave portion, A concave portion of the first insulating film and a common electrode formed on the first insulating film, and A second insulating film formed on the common electrode so as to correspond to a recess of the first insulating film and a portion of the driving part; Substrate for a liquid crystal display device comprising a. In claim 1, The liquid crystal display device has a reflection area that reflects light and a transmission area that transmits light, and the color filter has a hole located in the reflection area. In claim 2, The color filter includes red, green, and blue color filters, and holes formed in the red, green, and blue color filters have different sizes. A first substrate having a display unit for displaying an image and a driver unit provided around the display unit to provide a driving signal to the display unit; A color filter, a first insulating film formed on the color filter and having a recessed portion, a recessed portion of the first insulating film and a common electrode formed on the first insulating film, a recessed portion of the first insulating film and a portion of the driving portion; A second substrate having a second insulating film formed on the common electrode so as to correspond; Liquid crystal layer interposed between the first substrate and the second substrate Liquid crystal display comprising a. In claim 4, And a coupling member interposed between the first substrate and the second substrate to bond the first substrate and the second substrate and cover a portion of the driving unit. In claim 4, The lower substrate, Gate Line, A data line intersecting the gate line, A switching element connected to the gate line and the data line, and A pixel electrode coupled to the switching element Containing Liquid crystal display. In claim 6, The pixel electrode includes a transparent electrode and a reflective electrode. In claim 6, And the driver is connected to one end of the gate line to sequentially apply the driving signal to the gate line.