KR20060084490A - Optic mask for solidification and thin film transistor array panel using thesame - Google Patents

Abstract

The crystallization mask according to the present invention transmits a laser beam, and in a crystallization mask having a plurality of transmissive regions having a long width in the horizontal direction, the boundary of the transmissive region is inclined with respect to the X axis.

Crystallization, SLS, Thin Film Transistor, Projection

Description

Crystallization mask and thin film transistor display panel using same {OPTIC MASK FOR SOLIDIFICATION AND THIN FILM TRANSISTOR ARRAY PANEL USING THESAME}

1 to 3b are views for explaining a sequential side-solidification method according to an embodiment of the present invention.

4 is a layout view of a thin film transistor array panel for a liquid crystal display according to an exemplary embodiment of the present invention.

5 is a cross-sectional view of the thin film transistor array panel of FIG. 4 taken along the line V-V'-V ",

6 is a plan view 151 of FIG. 1 and illustrates a relationship between protrusions and gate electrodes in a semiconductor.

FIG. 7 is a plan view 161 of FIG. 1 and illustrates a relationship between protrusions and lightly doped regions in a semiconductor.

8A is a layout view at a first stage of a method of manufacturing the thin film transistor array panel of FIGS. 4 and 5 according to an embodiment of the present invention.

FIG. 8B is a cross-sectional view of the thin film transistor array panel of FIG. 8A taken along the line VIIIb-VIIIb'-VIIIb ".

9A is a layout view of a thin film transistor array panel in the next step of FIG. 8A.                 

FIG. 9B is a cross-sectional view of the thin film transistor array panel of FIG. 9A taken along the line IXb-IXb'-IXb ".

10 is a cross-sectional view at the next step in FIG. 9B.

11A is a layout view of a thin film transistor array panel in the next step of FIG. 10.

FIG. 11B is a cross-sectional view of the thin film transistor array panel of FIG. 11A taken along the line XIb-XIb′-XIb ″.

12A is a layout view of a thin film transistor array panel in the next step of FIG. 11A.

FIG. 12B is a cross-sectional view of the thin film transistor array panel of FIG. 11A taken along the line XIIb-XIIb'-XIIb ".

13 is a layout view illustrating a structure of a thin film transistor array panel for an organic light emitting diode display according to another exemplary embodiment of the present invention.

14 and 15 are cross-sectional views of the thin film transistor array panel of FIG. 13 taken along lines XIV-XIV ′ and XV-XV ′.

* Description of symbols on the main parts of the drawings *

70: light emitting layer

110: substrate

121: gate line

133: sustain electrode

151, 151a, 151b: semiconductor

171: data line                 

190: pixel electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to thin film transistor array panels, and more particularly, to thin film transistor array panels having semiconductors made of polycrystalline silicon crystallized by a sequential side-solidification method.

The thin film transistor array panel is used as a substrate of a flat panel display such as a liquid crystal display or an organic light display (OLED) having a plurality of pixels driven by the thin film transistor.

The liquid crystal display includes a field generating electrode for generating an electric field and a liquid crystal layer therebetween. In such a liquid crystal display, an electric field is formed on the liquid crystal layer by applying a voltage to two field generating electrodes to determine the alignment of liquid crystal molecules and to adjust the polarization of incident light to display an image. In this case, the thin film transistor is used to control the signal applied to the electrode.

The organic light emitting diode display is a self-emission display device that displays an image by exciting an emission of a light emitting organic material. The organic light emitting diode display includes a hole injection electrode (anode), an electron injection electrode (cathode), and an organic light emitting layer interposed therebetween. When holes and electrons are injected into the organic light emitting layer, the organic light emitting display emits light while being paired. .

Each pixel of the OLED display includes two thin film transistors, that is, a driving thin film transistor and a switching transistor. The amount of current of the driving thin film transistor that supplies a current for light emission is controlled by a data signal applied through the switching transistor. Widely used thin film transistors are made of amorphous silicon, polycrystalline silicon, or the like. Amorphous silicon can be deposited at a low temperature to form a thin film, and thus is mainly used in display devices using glass having a low melting point as a substrate.

However, the amorphous silicon thin film has difficulty in large area of the display device due to problems such as low field effect mobility. Therefore, there is a demand for the application of polycrystalline silicon having high field effect mobility, high frequency operating characteristics, and low leakage current electrical characteristics.

The electrical properties of thin films using polycrystalline silicon are greatly influenced by grain size and uniformity. That is, as the size and uniformity of the particles increase, the field effect mobility also increases. Therefore, there is increasing interest in a method of forming uniform polycrystalline silicon while increasing the particle size.

Methods of forming polycrystalline silicon include excimer laser anneal (ELA) and chamber anneal. Recently, sequential lateral sequentialization of producing polycrystalline silicon by inducing lateral growth of silicon crystals by laser. Lateral solidification (SLS) technology has been proposed.

Sequential lateral solidification technology takes advantage of the fact that silicon particles grow at the interface between liquid silicon and solid silicon in a direction perpendicular to the interface, and shift the magnitude of the laser beam energy and the laser beam irradiation range. ) And the mask is appropriately controlled to grow the silicon particles laterally by a predetermined length to crystallize the amorphous silicon.

The characteristic feature of the sequential side solid crystallization is that the crystals growing in the opposite direction meet and form protrusions, and the protrusions interfere with the flow of current, thereby making the image quality of the display device uneven, leading to diagonal stains and horizontal line stains.

An object of the present invention is to provide a crystallization mask that can have a uniform image quality without being affected by projections, a crystallization mask using the same, and a thin film transistor array panel formed using the same.

In order to achieve the above object, the crystallization mask according to the present invention transmits a laser beam, and in a crystallization mask having a plurality of transmissive regions having a long width in the horizontal direction, the boundary of the transmissive region is inclined with respect to the X axis.

The light transmissive area has two rows arranged in the horizontal direction, and each column is preferably shifted by a predetermined distance.

Further, the inclination of the light transmitting area is preferably arctan (the width of the light transmitting area / width overlapping with the neighboring light transmitting area).

In order to achieve the above object, the thin film transistor array panel according to the present invention is formed on a substrate and a substrate, and includes a channel region and first and second source / drain regions, and is formed on a plurality of semiconductors and semiconductors. A plurality of gate lines formed on the gate insulating layer, the gate insulating layer and overlapping the channel region, a plurality of data lines formed on the gate insulating layer and connected to the first source / drain region, and formed on the gate insulating layer, and the second source. A pixel electrode connected to the / drain region, wherein the surface of the semiconductor has a plurality of protrusions and the protrusions are inclined at various inclinations with respect to a line perpendicular to the gate line, and are irregularly disposed on the substrate.

The semiconductor is made by a sequential lateral solid crystallization process using a crystallization mask having a transmissive region, and the inclination of the protrusion is preferably arctan (width of the transmissive region / width overlapping with the neighboring transmissive region).

The display device may further include a storage electrode line parallel to the gate line.

In addition, the insulating film may further include a blocking film formed between the semiconductor.

The semiconductor device may further include a passivation layer formed between the gate line and the data line and the pixel electrode.

The semiconductor device may further include an interlayer insulating layer formed between the gate line and the data line, and an output electrode formed between the interlayer insulating layer and the passivation layer and connected to the second source / drain region and the pixel electrode.

The display device may further include a partition formed on the pixel electrode and a light emitting layer surrounded by the partition.

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 portion of a layer, film, region, plate, etc. is said to be "on top" of another part, this includes not only when the other part is "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.

Now, the crystallization mask according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3B along with a sequential side-solidification method using the same.

1 to 3b are views for explaining a sequential side-solidification method according to an embodiment of the present invention.

As shown in FIGS. 1 and 2, the sequential lateral solidification method is made of amorphous silicon by irradiating a laser beam to the semiconductor film 150 made of amorphous silicon through a mask MP having a plurality of slits T. The liquid crystal region L corresponding to the slit T is formed in the semiconductor film 150.

As shown in FIGS. 2 and 3B, the plurality of slits T are long and wide in the horizontal direction and form two rows S1 and S2 arranged in the horizontal direction. The slits T of each of the rows T1 and T2 are separated by a predetermined distance, for example, the width of the slit T, and the slits T of the two rows S1 and S2 are a predetermined distance, for example. For example, they are shifted by the width of the slit T.

Each slit T is inclined at various angles with respect to the X axis and arranged at random. In this case, referring to FIG. 3B, the slope of the slit T is varied within arctan (the length of the X axis of the slit XL / the length of the overlap portion YL of the slit and the slit to the Y axis). FIG. 3B is an enlarged view of a portion G of FIG. 3A.

In this sequential side solid phase crystallization process, the amorphous silicon of the liquid phase region L is gradually cooled and crystallized. The crystal grains are perpendicular to the interface from the boundary between the liquid region L to which the laser is irradiated and the solid state region to which the laser is not irradiated. To grow. And the two grains growing in the opposite direction meet in the center of the liquid region (L) and stops growing. At this time, protrusions are formed at the portion where the two grains meet.

Therefore, when the crystallization is performed using a mask having an inclined slit, the protrusions formed are inclined in the same manner as the slits and are randomly distributed.

After the laser irradiation described above is completed, as shown in FIG. 3A, the mask MP is moved to the Y axis or the X axis with respect to the substrate 110 or vice versa while the substrate 110 is moved. Crystallization is performed on the semiconductor film 150 made of silicon.

Then, the polycrystalline silicon thin film transistor using sequential lateral solidification using the crystallization mask will be described in detail with reference to FIGS. 4 and 5.

4 is a layout view of a thin film transistor array panel for a liquid crystal display according to an exemplary embodiment of the present invention. FIG. 5 is a cross-sectional view of the thin film transistor array panel of FIG. 4 taken along a line V-V′-V ″, and FIG. 1 is a plan view 151 of FIG. 1 showing a relationship between protrusions and a gate electrode in a semiconductor, and FIG. 7 is a plan view 161 of FIG. 1 illustrating a relationship between protrusions and a lightly doped region in a semiconductor.

4 and 5, a blocking film 111 made of silicon oxide (SiO ₂ ), silicon nitride (SiNx), or the like is formed on the transparent insulating substrate 110. The blocking film 111 may have a multilayer structure.

On the blocking film 111, a plurality of island-like semiconductors 151 made of polycrystalline silicon are formed. The island-like semiconductor 151 is long horizontally, and both ends thereof have a large area for connection with other layers.

The island-like semiconductor 151 crystallizes amorphous silicon through sequential lateral solidification, and as shown in FIG. 6, a linear protrusion P is formed on the surface thereof. At this time, the projections P are inclined at various angles and are irregularly distributed.

Each semiconductor 151 includes an impurity region containing conductive impurities and an intrinsic region containing little conductive impurities, and a heavily doped region having a high impurity concentration in the impurity region. There is a lightly doped region with low concentrations of impurities.                     

The intrinsic region includes two channel regions 154a and 154b that are spaced apart from each other. The high concentration impurity region includes a plurality of source / drain regions 153, 155, and 157 separated from each other with respect to the channel regions 154a and 154b. At this time, the channel regions 154a and 154b may be formed in a smaller or larger number than in the embodiment of the present invention, and thus the source / drain regions may be formed in a smaller or larger number.

The low concentration impurity regions 152a and 152b located between the source / drain regions 153, 155 and 157 and the channel regions 154a and 154b are called lightly doped drain regions (LDD regions) and have a width. Narrower than other areas

At this time, examples of the conductive impurity include P-type impurities such as boron (B) and gallium (Ga) and N-type impurities such as phosphorus (P) and arsenic (As). The lightly doped regions 152a and 152b prevent leakage current or punch through from the thin film transistor, and the lightly doped regions 152a and 152b are free of impurities. ) Can be replaced with an area.

Since the protrusions P included in the semiconductor 151 are irregularly distributed at various inclinations, the protrusions P are included in the channel region P and the lightly doped regions 152a and 152b as shown in FIGS. 6 and 7. The number and arrangement of the projections P also vary and are irregularly distributed.

The thin film transistor can flow leakage current even when it is turned off. The projections in the channel region and the lightly doped region affect the current flow of the thin film transistor to change the leakage current, thereby changing the electrical characteristics of the thin film transistor. The number and arrangement of the projections P included in the semiconductor 151 change the optical characteristics such as light reflected by the projections or scattering by the projections.

Thus, when the projections P having various inclinations are formed as in the exemplary embodiment of the present invention, electrical and optical characteristics of the thin film transistors are varied. By irregularly distributing such various electrical and optical properties, it is possible to provide a uniform thin film transistor array panel in which unevenness does not occur.

On the semiconductor 151 and the blocking layer 111, a gate insulating layer 140 having a thickness of several hundred micrometers of silicon nitride or silicon oxide is formed.

A plurality of gate lines 121 and a plurality of storage electrode lines 131 extending in the horizontal direction are formed on the gate insulating layer 140.

The gate line 121 transmits a gate signal, and a portion of the semiconductor 151 protrudes upward and includes a plurality of protrusions overlapping the channel regions 154a and 154b of the semiconductor 151. As such, a portion of the gate line 121 overlapping the channel regions 154a and 154b is used as the gate electrodes 124a and 124b of the thin film transistor. The gate electrodes 124a and 124b may also overlap the lightly doped regions 152a and 152b.

One end portion of the gate line 121 may have a large area in order to connect to another layer or an external driving circuit, and when a gate driving circuit (not shown) generating a gate signal is integrated on the substrate 110. The gate line 121 may be directly connected to the gate driving circuit.                     

The storage electrode line 131 is positioned between the two gate lines 121 and is adjacent to the lower side of the two gate lines 121. The storage electrode line 131 includes the storage electrode 133 extending in the vertical direction to the vicinity of the upper gate line 121, and applies a predetermined voltage such as a common voltage applied to a common electrode (not shown). Receive.

The gate line 121 may be formed of aluminum-based metal such as aluminum (Al) or aluminum alloy, silver-based metal such as silver (Ag) or silver alloy, copper-based metal such as copper (Cu) or copper alloy, molybdenum (Mo) or molybdenum It may be made of molybdenum-based metals such as alloys, chromium (Cr), tantalum (Ta), and titanium (Ti). However, the gate line 121 may have a multilayer structure including two conductive layers (not shown) having different physical properties. One of the conductive layers is made of a low resistivity metal, for example, an aluminum-based metal, a silver-based metal, or a copper-based metal so as to reduce a signal delay or voltage drop of the gate line 121. The other conductive layer may be made of another material, particularly a material having excellent physical, chemical and electrical contact properties with indium tin oxide (ITO) and indium zinc oxide (IZO), such as molybdenum-based metal, chromium, tantalum, or titanium. . A good example of such a combination is a chromium bottom film and an aluminum top film, and an aluminum bottom film and a molybdenum top film.

One of these conductive films is a low resistivity metal such as an aluminum-based metal, a silver-based metal, or a copper-based metal so as to reduce signal delay or voltage drop of the gate line 121 and the storage electrode line 131. It may be made of a metal. The other conductive layer may be formed of a material having excellent contact properties with other materials, particularly indium tin oxide (ITO) and indium zinc oxide (IZO), such as molybdenum-based metal, chromium, tantalum, titanium, or the like. A good example of such a combination is a chromium bottom film and an aluminum top film, and an aluminum bottom film and a molybdenum top film.

Side surfaces of the gate line 121 and the storage electrode line 131 are inclined with respect to the surface of the substrate 110 so that the upper thin film can be smoothly connected.

An interlayer insulating film 160 is formed on the gate line 121, the storage electrode line 131, and the gate insulating layer 140. The interlayer insulating layer 160 is an organic material having excellent planarization characteristics and photosensitivity, a low dielectric constant insulating material such as a-Si: C: O, a-Si: O: F, or the like formed by plasma chemical vapor deposition, or It may be formed of an inorganic material such as silicon nitride. A plurality of contact holes 163 and 165 exposing the outermost source / drain regions 153 and 155 are formed in the interlayer insulating layer 160 and the gate insulating layer 140, respectively.

A plurality of date lines 171 and a plurality of output electrodes 175 are formed on the interlayer insulating layer 160 to intersect the gate line 121.

Each data line 171 includes an input electrode 173 connected to the source / drain region 153 through the contact hole 163. One end of the data line 171 may have a large area in order to connect with another layer or an external driving circuit, and when a data driving circuit (not shown) generating a data signal is integrated on the substrate 110 Line 171 may be directly connected to the data driving circuit. The storage electrode 133 is positioned between two adjacent data lines 171.                     

The output electrode 175 is separated from the input electrode 173 and connected to the source / drain region 155 through the contact hole 165.

The data line 171 and the output electrode 175 are preferably made of a refractory metal such as molybdenum, chromium, tantalum, titanium, or an alloy thereof. However, they may also have a multilayer structure including a conductive film having a low resistance and a conductive film having good contact characteristics, such as the gate line 121. Examples of the multilayer film structure include a triple film of molybdenum film, aluminum film, and molybdenum film in addition to the above-described double film of chromium lower film and aluminum upper film or aluminum lower film and molybdenum upper film.

Side surfaces of the data line 171 and the output electrode 175 may also be inclined with respect to the substrate 110 surface.

A passivation 180 made of an organic material having excellent planarization characteristics is formed on the data line 171, the output electrode 175, and the interlayer insulating layer 160. The passivation layer 180 may be made of only a photo process using a material having photosensitivity. The passivation layer 180 may also be formed of plasma enhanced chemical vapor deposition (PECVD), such as a-Si: C: O, a-Si: O: F, or a dielectric constant of 4.0 or less, such as dielectric constant or silicon nitride The protective layer 180 may include a lower layer of an inorganic material and an upper layer of an organic material. The protective layer 180 may include a plurality of contact holes 185 and a data line 171 exposing the output electrode 175. It has a plurality of contact holes 182 exposing one end of the.

On the passivation layer 180b, a pixel electrode 190 and a contact auxiliary member 82 made of a transparent conductive material such as IZO (indium zinc oxide) or ITO (indium tin oxide), or an opaque reflective conductive material such as aluminum or silver ) Is formed.

The pixel electrode 190 is connected to the output electrode 175 connected to the source / drain region 155 through the contact hole 185 to receive a data voltage from the source / drain region 155 and the output electrode 175.

The contact assistant 82 serves to protect the adhesiveness between the end portion of the data line 171 and the external device. The pixel electrode 190 to which the data voltage is applied generates an electric field together with the common electrode to which the data voltage is applied to determine the direction of liquid crystal molecules of a liquid crystal layer (not shown) between the two electrodes.

In the case of the liquid crystal display, the pixel electrode 190 and the common electrode form a capacitor (hereinafter, referred to as a 'liquid crystal capacitor') to maintain an applied voltage even after the thin film transistor is turned off. To do this, another capacitor connected in parallel with the liquid crystal capacitor is provided, which is called a storage capacitor. The storage capacitor is made by overlapping the storage electrode line 131 including the pixel electrode 190 and the storage electrode 133. The storage electrode 133 may not be formed depending on the amount of storage power required.

The pixel electrode 190 may overlap the data line 171 to improve the aperture ratio.

Next, a method of manufacturing the thin film transistor array panel shown in FIGS. 4 and 5 using the crystal mask shown in FIGS. 1 to 3 will be described with reference to FIGS. 8A to 12B.

FIG. 8A is a cross-sectional view at a first stage of a method of manufacturing the thin film transistor array panel of FIGS. 4 and 5 according to an embodiment of the present invention, and FIG. 8B is a VIIIb-VIIIb'-VIIIb "view of the thin film transistor array panel of FIG. 9A is a layout view of a thin film transistor array panel in the next step of FIG. 8A, and FIG. 9B is a cross-sectional view cut along the line IXb-IXb'-IXb "of FIG. 9A. 10A is a layout view of a thin film transistor array panel in a next step of FIG. 9A, FIG. 10 is a cross-sectional view in a next step of FIG. 9B, and FIG. 11A is a layout view of a thin film transistor array panel in a next step of FIG. 10, and FIG. 11B is a cross-sectional view of the thin film transistor array panel of FIG. 11A taken along the line XIb-XIb′-XIb ″, FIG. 12A is a layout view of the thin film transistor array panel in the next step of FIG. 11A, and FIG. 12B is a view of FIG. 11A The film transistor panel XIIb-XIIb-XIIb' "is a cross-sectional view cut along the line.

First, as shown in FIGS. 8A and 8B, the blocking layer 111 is formed on the transparent insulating substrate 110, and then, as amorphous silicon by chemical vapor deposition (CVD), sputtering, or the like. The formed semiconductor film is formed.

Next, the semiconductor film is crystallized by the sequential side solidification method shown in FIGS. 1 to 3B. In this case, protrusions are formed on the surface of the semiconductor film, and the protrusions are inclined at various angles.

As shown in FIGS. 9A and 9B, the gate insulating layer 140 is formed on the substrate by a chemical vapor deposition method. In addition, a metal film is stacked on the gate insulating layer 140 by sputtering to form a photoresist pattern PR. The metal film is etched using the photoresist pattern PR as an etch mask to form a plurality of gate lines 121 including the gate electrode 124 and a plurality of storage electrode lines 131 including the storage electrode 133.

In this case, the etching time is sufficiently long so that the boundary line between the gate line 121 and the storage electrode line 131 is positioned inside the photoresist pattern PR.

Subsequently, a high concentration of N-type or P-type impurity ions are implanted into the island-type semiconductor 151 using the photoresist pattern PR as an ion implantation mask to form a plurality of high-concentration impurity regions including the source / drain regions 153, 155, and 157. Form.

Next, as shown in FIG. 10, after removing the photoresist pattern PR, the island-type semiconductor 151 is doped with low concentration of N-type or P-type impurity ions using the gate line 121 and the storage electrode line 131 as an ion implantation mask. Thus, a plurality of low concentration impurity regions 152a and 152b are formed. In this way, the region under the gate electrode 124 positioned between the source region 153 and the drain region 155 becomes the channel region 154 and the region under the storage electrode line 131 becomes the storage region 157.

The low concentration impurity regions 152a and 152b may be formed by using metal films having different etching ratios in addition to the photoresist pattern described above, or by forming spacers on sidewalls of the gate line 121 and the storage electrode line 131. have.

11A and 11B, the plurality of contact holes 163 and 165 exposing the source / drain regions 153 and 155 to expose the source / drain regions 153 and 155, respectively, by stacking an interlayer insulating layer 160 on the entire surface of the substrate 110. Form.

Next, a plurality of data lines 171 and a plurality of output electrodes having an input electrode 173 connected to the source region 153 and the drain region 155, respectively, through the contact holes 163 and 165 on the interlayer insulating layer 160. 175 is formed.

12A and 12B, a contact hole exposing the ends of the output electrode 175 and the data line 171 by stacking the passivation layer 180 and removing a part of the passivation layer 180 by a photo process, respectively. (185, 182).

4 and 5, the plurality of pixel electrodes 190 connected to the output electrode 175 through the contact hole 185 with a transparent conductive material such as IZO, ITO, or the like on the passivation layer 180. Form.

Next, a thin film transistor array panel according to another exemplary embodiment of the present invention will be described in detail with reference to FIGS. 13 to 15.

FIG. 13 is a layout view illustrating a structure of a thin film transistor array panel for an organic light emitting diode display according to another exemplary embodiment, and FIGS. 14 and 15 illustrate XIV-XIV ′ and XV-XV ′ lines of the thin film transistor array panel of FIG. 13. It is a cross-sectional view cut along.

As shown in FIGS. 13 to 15, a blocking film 111 made of silicon oxide, silicon nitride, or the like is formed on the insulating substrate 110. The first and second semiconductors 151a and 151b are formed on the blocking film 111, and the capacitor semiconductor 157 is connected to the second semiconductor 151b. The first semiconductor 151a includes a first source region, a channel region, and a drain region 153a, 154a, and 155a, and the second semiconductor 151b includes a second source region, channel region, and drain region 153b and 154b. 155b).

The first source region 153a and the first drain region 155a are doped with n-type impurities, and the second source region 153b and the second drain region 155b are doped with p-type impurities. Depending on the driving conditions, the first source region 153a and the first drain region 155a may be doped with p-type impurities, and the second source region 153b and the second drain region 155b may be doped with n-type impurities. have.

The first semiconductor 151a and the second semiconductor 151b are crystallized amorphous silicon through sequential lateral solidification, and as shown in FIG. 6, linear protrusions P are formed on the surface thereof. At this time, the projections P are inclined at various angles and are irregularly distributed. Here, the first semiconductor 151a is a semiconductor of the switching thin film transistor, and the second semiconductor 152b is a semiconductor of the driving thin film transistor.

A gate insulating layer 140 made of silicon oxide or silicon nitride is formed on the semiconductors 151a, 151b, and 157. The gate line 121 and the storage electrode 133 are formed on the gate insulating layer 140. The first gate electrode 124a is connected to the gate line 121 to have a branch shape, and overlaps the channel region 154a of the first semiconductor. The second gate electrode 124b is connected to the gate line 121. Are separated and overlap with the channel region (second channel region 154b) of the second semiconductor 151b. The storage electrode 133 is connected to the second gate electrode 124b and overlaps the storage electrode portion 157 of the semiconductor.

Since the projections P included in the semiconductors 151a and 151b are irregularly distributed at various inclinations, the channel regions P and the lightly doped regions 152a and 152b are illustrated in FIGS. 6 and 7. The number and arrangement of the projections (P) included in the variety and irregularly distributed. The projections present in the channel region and the lightly doped region affect the current flow of the thin film transistor and vary the leakage current. The projection P deforms the color to be displayed because light entering the display device is reflected or scattered by the projection and transmitted to the liquid crystal.

Thus, when the protrusions having various inclinations are formed as in the exemplary embodiment of the present invention, the electrical and optical characteristics of the thin film transistors are varied. In addition, by uniformly distributing such various electrical and optical characteristics, it is possible to provide a uniform thin film transistor array panel in which unevenness does not occur.

The gate line 121 and the storage electrode line 133 may be formed of aluminum-based metal such as aluminum (Al) or aluminum alloy, silver-based metal such as silver (Ag) or silver alloy, copper-based metal such as copper (Cu) or copper alloy, Molybdenum-based metals such as molybdenum (Mo) or molybdenum alloy, chromium (Cr), tantalum (Ta) and titanium (Ti) and the like. However, the gate line 121 may have a multilayer structure including two conductive layers (not shown) having different physical properties. One of the conductive layers is made of a low resistivity metal, for example, an aluminum-based metal, a silver-based metal, or a copper-based metal so as to reduce a signal delay or voltage drop of the gate line 121. The other conductive layer may be made of another material, particularly a material having excellent physical, chemical and electrical contact properties with indium tin oxide (ITO) and indium zinc oxide (IZO), such as molybdenum-based metal, chromium, tantalum, or titanium. . A good example of such a combination is a chromium bottom film and an aluminum top film, and an aluminum bottom film and a molybdenum top film.

A first interlayer insulating layer 801 is formed on the gate line 121, the first and second gate electrodes 124a and 124b, and the storage electrode 133, and transmits a data signal on the first interlayer insulating layer 801. A data line 171, a linear power supply voltage electrode 172 for supplying a power supply voltage, first and second input electrodes 173a and 173b, and first and second output electrodes 175a and 175b are formed. have.

The first input electrode 173a is part of the data line 171 and has a branch shape, and the first source region is provided through a contact hole 181 penetrating through the first interlayer insulating layer 801 and the gate insulating layer 140. The contact hole 153a is connected to the second source region 173b and has a branch shape as part of the electrode 172 for the power supply voltage, and penetrates the first interlayer insulating layer 801 and the gate insulating layer 140. It is connected to the second source region 153b through 184.

The first drain region 175a is connected to the first drain region 155a and the second gate electrode 124b through the contact holes 182 and 183 penetrating the first interlayer insulating layer 801 and the gate insulating layer 140. They are in electrical contact with each other by contact. The second output electrode 175b is connected to the second drain region 155b through a contact hole 186 penetrating through the first interlayer insulating layer 801 and the gate insulating layer 140, and the data line 171. It is made of the same material.

A second interlayer insulating film 802 made of silicon nitride, silicon oxide, or an organic insulating material is formed on the data line 171, the power voltage electrode 172, and the first and second output electrodes 175a and 175b. The second interlayer insulating film 802 has a contact hole 185 exposing the second output electrode 175b.

The pixel electrode 190 connected to the second output electrode 175b is formed on the second interlayer insulating layer 802 through the contact hole 185. The pixel electrode 190 is preferably formed of a material having excellent reflectivity such as aluminum or silver alloy.

However, if necessary, the pixel electrode 190 may be formed of a transparent insulating material such as indium tin oxide (ITO) or indium zinc oxide (IZO). The pixel electrode 190 made of a transparent conductive material is applied to a bottom emission organic light emitting diode that displays an image in a downward direction of the display panel. The pixel electrode 190 made of an opaque conductive material is applied to top emission organic light emitting diodes that display an image in an upper direction of the display panel.

An organic insulating material is formed on the second interlayer insulating layer 802, and a partition 803 is formed to separate the organic light emitting cells. The partition 803 surrounds the pixel electrode 190 to define a region in which the organic emission layer 70 is to be filled. The partition wall 803 serves as a light shielding film by exposing and developing a photosensitive agent including a black pigment, and at the same time, the forming process can be simplified. An organic emission layer 70 is formed in an area on the pixel electrode 190 surrounded by the partition 803. The organic light emitting layer 70 is formed of an organic material emitting one of red, green, and blue light, and the red, green, and blue organic light emitting layers 70 are repeatedly arranged in sequence.                     

The buffer layer 804 is formed on the organic light emitting layer 70 and the partition 803. The buffer layer 804 may be omitted as necessary.

The common electrode 270 is formed on the buffer layer 804. The common electrode 270 is made of a transparent conductive material such as ITO or IZO. If the pixel electrode 190 is made of a transparent conductive material such as ITO or IZO, the common electrode 270 may be made of a metal having good reflectivity such as aluminum.

Although not shown, an auxiliary electrode may be formed of a metal having low resistance to compensate for the conductivity of the common electrode 270. The auxiliary electrode may be formed between the common electrode 270 and the buffer layer 804 or on the common electrode 270. The auxiliary electrode may be formed in a matrix shape along the partition wall 803 so as not to overlap the organic light emitting layer 70. .

As described above, by varying the inclination of the projections and irregularly distributing the projections, the thin film transistor array panel having uniform image quality can be provided by irregularly distributing electrical and optical characteristics due to the projections.

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.

Claims (10)

In a crystallization mask that transmits a laser beam and has a plurality of transmissive areas that are long and wide in the transverse direction, And a boundary of the light transmitting area inclined with respect to the X axis. In claim 1, And the light-transmitting area has two columns arranged in the horizontal direction, each column being shifted by a predetermined distance. In claim 1, And the slope of the light transmitting area is arctan (the width of the light transmitting area / width overlapping with the neighboring light transmitting area). Board, A plurality of semiconductors formed on the substrate and including channel regions and first and second source / drain regions and made of polycrystalline silicon; A gate insulating film formed on the semiconductor, A plurality of gate lines formed on the gate insulating layer and overlapping the channel region; A plurality of data lines formed on the gate insulating layer and connected to the first source / drain region, and A pixel electrode formed on the gate insulating layer and connected to the second source / drain region; The surface of the semiconductor has a plurality of projections and the projections are inclined at various inclination with respect to the line perpendicular to the gate line, the thin film transistor array panel irregularly disposed on the substrate. In claim 4, The semiconductor is made by a sequential side solid phase crystallization process using a crystallization mask having a light transmitting region, The inclination of the protrusions is arctan (the width of the transmissive area / width overlapping with the neighboring transmissive area). In claim 4, The thin film transistor array panel further includes a storage electrode line parallel to the gate line. In claim 4, The thin film transistor array panel of claim 1, further comprising a blocking layer formed between the insulating substrate and the semiconductor. In claim 4, And a passivation layer formed between the gate line and the data line and the pixel electrode. In claim 4, An interlayer insulating film formed between the gate line and the data line, and And an output electrode formed between the interlayer insulating layer and the passivation layer and connected to the second source / drain region and the pixel electrode. In claim 4, Barrier ribs formed on the pixel electrodes; And a light emitting layer surrounded by the partition wall.

Images