CN102012590A - FFS type TFT-LCD array substrate and manufacturing method thereof - Google Patents
FFS type TFT-LCD array substrate and manufacturing method thereof Download PDFInfo
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- CN102012590A CN102012590A CN2009100919994A CN200910091999A CN102012590A CN 102012590 A CN102012590 A CN 102012590A CN 2009100919994 A CN2009100919994 A CN 2009100919994A CN 200910091999 A CN200910091999 A CN 200910091999A CN 102012590 A CN102012590 A CN 102012590A
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Abstract
The present invention relates to a FFS type TFT-LCD array substrate and a manufacturing method thereof, the array substrate comprises grid wires and data lines arranged on the substrate and defining a pixel area in which a pixel electrode, a thin film transistor, and a common electrode forming an edge electric field together with the pixel electrode are formed. The array substrate further comprises a black matrix prepared by metal thin film materials, and the black matrix is connected with the common electrode. The manufacturing method comprises forming the figures of the grid wires, the data wires, the pixel electrode and the thin film transistor; forming the figures of the common electrode and the black matrix which is prepared by metal thin film materials and connected with the common electrode. According to the invention, the figure of the black matrix is arranged on the array substrate and the black matrix is connected with the common electrode, which makes the black matrix block a light leak area effectively, and serve as a connection bus of the common electrode. The invention can effectively solve the problems of high production cost of present structure and the technical defect of the delay of the common electrode.
Description
Technical field
The present invention relates to a kind of Thin Film Transistor-LCD and manufacture method thereof, especially a kind of FFS type TFT-LCD array base palte and manufacture method thereof.
Background technology
At Thin Film Transistor-LCD (Thin Film Transistor Liquid Crystal Display, abbreviation TFT-LCD) in the product, fringe field switching technology (Fringe Field Switching, be called for short FFS) be one of the technology that can improve the LCD image quality that occurs recent years, can realize high-penetrability simultaneously and wait requirement with great visual angle.At present, the agent structure of prior art FFS type TFT-LCD comprises establishes therebetween array base palte and color membrane substrates to box together and with liquid crystal folder, be formed with the public electrode of grid line, data line, pixel electrode, thin film transistor (TFT) and list structure on the array base palte, be formed with color resin figure and black matrix figure on the color membrane substrates, black matrix figure is mainly used in and blocks the light leak zone.
In the early stage FFS type TFT-LCD structure, black matrix figure adopts the resin material preparation usually on the color membrane substrates, and the width of data line on the array base palte is mainly considered in the design of black matrix width.Along with improving constantly that aperture opening ratio requires, the narrowed width of data line, the black matrix of resin material becomes the principal element that hinders the aperture opening ratio increase gradually.For improving aperture opening ratio, prior art has proposed a kind of technical scheme that adopts the black matrix figure of metal material preparation, though can reduce black matrix width, for FFS type mode of operation, the metal black matrix can produce the electric field distorting phenomenon, influences the display quality of TFT-LCD.For overcoming the electric field distorting phenomenon, prior art has proposed a kind of solution that black matrix on the color membrane substrates is electrically connected with public electrode on the array base palte, way is particularly: when preparation color membrane substrates and array base palte, on overlayer, offer via hole respectively and form transmission point (transfer dot), by the transmission public electrode conducting on the black matrix and array base palte on the color membrane substrates of naming a person for a particular job.
The actual use shows that not only there is the high defective of production cost in this solution, but also has defective such as public electrode delay.Because the transmission point is made the production equipment that needs to increase patterning thin film, needs to increase technological process, therefore causes production cost to increase.Because public electrode lays respectively on the different substrates with black matrix, and pass through the connection of transmission point, therefore this version has caused the serious delay of public electrode, can't use in such as fields such as large scale demonstration and LCD TV.
Summary of the invention
The purpose of this invention is to provide a kind of FFS type TFT-LCD array base palte and manufacture method thereof, effectively solve the technological deficiency that the existing structure production cost is high and public electrode postpones.
For achieving the above object, the invention provides a kind of FFS type TFT-LCD array base palte, comprise the grid line and the data line that are formed on the substrate and define pixel region, be formed with pixel electrode, thin film transistor (TFT) in the described pixel region and form the public electrode of fringe field with described pixel electrode, comprise that also described black matrix is connected with described public electrode by the black matrix of metallic film material preparation.
Described thin film transistor (TFT) comprises gate electrode, active layer, source electrode and drain electrode, and described gate electrode is connected with grid line, and is formed on the substrate; Gate insulation layer is formed on grid line and the gate electrode and covers whole base plate; The active layer that comprises semiconductor layer and doping semiconductor layer is formed on the gate insulation layer and is positioned at the top of gate electrode; Pixel electrode is formed on the gate insulation layer and is positioned at pixel region; One end of source electrode is positioned on the active layer, and the other end is connected with data line, and an end of drain electrode is positioned on the active layer, and the other end is connected with pixel electrode, forms the TFT channel region between source electrode and the drain electrode; Passivation layer is formed on the above-mentioned composition and covers whole base plate.
Described public electrode is for several electrode strips that are arranged in order and be formed on the described passivation layer, and described black matrix is formed on the above-mentioned composition.Further, described public electrode and black matrix are formed by a composition technology of the secondary composition technology that adopts the normal masks plate or employing shadow tone or gray mask plate.
Described black matrix is formed on the described passivation layer, and described public electrode is for several electrode strips that are arranged in order and be formed on the above-mentioned composition.Further, described black matrix and public electrode are formed by the secondary composition technology that adopts the normal masks plate.
On the technique scheme basis, described black matrix is positioned at the top of described grid line and/or data line.
Described black matrix is positioned at the top of described thin film transistor (TFT).
Described black matrix surface is provided with anti-reflection layer.
For achieving the above object, the present invention also provides a kind of FFS type TFT-LCD manufacturing method of array base plate, comprising:
On substrate, form the figure that comprises grid line, data line, pixel electrode and thin film transistor (TFT);
Form the figure that comprises public electrode and black matrix finishing on the substrate of abovementioned steps, described black matrix is connected with described public electrode.
Described formation on substrate comprises that the figure of grid line, data line, pixel electrode and thin film transistor (TFT) comprises:
Deposition grid metallic film forms the figure that comprises grid line and gate electrode by composition technology on substrate;
Deposit gate insulation layer, semiconductive thin film and doped semiconductor films on the substrate of abovementioned steps successively finishing, form the figure that comprises active layer by composition technology, active layer comprises semiconductor layer and doping semiconductor layer, is formed on the gate insulation layer and is positioned at the top of gate electrode;
Finish deposit transparent conductive film on the substrate of abovementioned steps, comprising pattern of pixel electrodes by the formation of composition technology;
Sedimentary origin leaks metallic film on the substrate of abovementioned steps finishing, form the figure that comprises data line, source electrode, drain electrode and TFT channel region by composition technology, one end of described source electrode is positioned on the active layer, the other end is connected with data line, one end of described drain electrode is positioned on the active layer, the other end directly is connected with pixel electrode, forms the TFT channel region between described source electrode and the drain electrode.
On the technique scheme basis, described formation comprises that the figure of public electrode and black matrix comprises:
Finish deposit passivation layer and transparent conductive film on the substrate of abovementioned steps, adopting the normal masks plate to form the figure that comprises public electrode by composition technology, described public electrode is several electrode strips that is arranged in order;
Finishing the black matrix metallic film of deposition on the substrate of abovementioned steps, adopt the normal masks plate to form the figure that comprises black matrix by composition technology, described black matrix is connected with public electrode.
On the technique scheme basis, described formation comprises that the figure of public electrode and black matrix comprises:
Finish on the substrate of abovementioned steps at first deposit passivation layer, successive sedimentation transparent conductive film and black matrix metallic film then;
On black matrix metallic film, apply one deck photoresist;
Adopt shadow tone or gray mask plate that photoresist is exposed, make the complete reserve area of photoresist formation photoresist, photoresist remove zone and photoresist part reserve area fully after the development.Wherein the complete reserve area of photoresist is corresponding to black matrix figure region, and photoresist part reserve area is corresponding to the common pattern of electrodes region, and photoresist is removed the zone fully corresponding to the zone beyond the above-mentioned figure;
By the first time etching technics etch away black matrix metallic film and the transparent conductive film that photoresist is removed the zone fully, form the figure comprise black matrix;
By the photoresist of cineration technics removal photoresist part reserve area, expose the black matrix metallic film in this zone;
By the second time etching technics etch away the black matrix metallic film of photoresist part reserve area fully, form the figure that comprises public electrode;
Peel off remaining photoresist.
On the technique scheme basis, described formation comprises that the figure of public electrode and black matrix comprises:
Finish deposit passivation layer and black matrix metallic film on the substrate of abovementioned steps, adopting the normal masks plate to form the figure that comprises black matrix by composition technology;
Finish deposit transparent conductive film on the substrate of abovementioned steps, adopting the normal masks plate to form the figure that comprises public electrode by composition technology, described public electrode is connected with black matrix for several electrode strips that is arranged in order, described public electrode.
The invention provides a kind of FFS type TFT-LCD array base palte and manufacture method thereof, be arranged on the array base palte by deceiving the matrix figure, and black matrix is connected with public electrode, make black matrix not only effectively block the light leak zone, and, efficiently solve the technological deficiency of the high and public electrode delay of existing structure production cost as the connecting bus of public electrode.Because the black matrix of metallic film material is formed on the top of grid line, data line, source electrode and drain electrode, therefore can effectively reduce black matrix width, improve aperture opening ratio.Be connected owing to black matrix all is arranged on the array base palte and directly with public electrode, therefore eliminated the defective of the public electrode delay of existing structure existence fully, can be widely used in fields such as large scale demonstration and LCD TV.Because the black matrix figure of preparation can adopt existing process equipment and technological process on array base palte, do not need to increase extra production equipment, reduced the equipment and the technology of the black matrix figure of preparation on color membrane substrates simultaneously, so the present invention effectively reduces production cost.
Description of drawings
Fig. 1 is the planimetric map of FFS type TFT-LCD array base palte first embodiment of the present invention;
Fig. 2 be among Fig. 1 A1-A1 to sectional view;
Fig. 3 be among Fig. 1 B1-B1 to sectional view;
Fig. 4 is the planimetric map after FFS type TFT-LCD array base palte first embodiment composition technology first time of the present invention;
Fig. 5 be among Fig. 4 A2-A2 to sectional view;
Fig. 6 is the planimetric map after FFS type TFT-LCD array base palte first embodiment composition technology second time of the present invention;
Fig. 7 be among Fig. 6 A3-A3 to sectional view;
Fig. 8 is FFS type TFT-LCD array base palte first embodiment of the present invention planimetric map after the composition technology for the third time;
Fig. 9 be among Fig. 8 A4-A4 to sectional view;
Figure 10 be among Fig. 8 B4-B4 to sectional view;
Figure 11 is the planimetric map after the 4th composition technology of FFS type TFT-LCD array base palte first embodiment of the present invention;
Figure 12 be among Figure 11 A5-A5 to sectional view;
Figure 13 be among Figure 11 B5-B5 to sectional view;
Figure 14 is the planimetric map after the 5th composition technology of FFS type TFT-LCD array base palte first embodiment of the present invention;
Figure 15 be among Figure 14 A6-A6 to sectional view;
Figure 16 be among Figure 14 B6-B6 to sectional view;
Figure 17 for resist exposure in the 5th composition technology of FFS type TFT-LCD array base palte first embodiment of the present invention develop back B6-B6 to sectional view;
Figure 18 in the 5th composition technology of FFS type TFT-LCD array base palte first embodiment of the present invention for the first time behind the etching technics B6-B6 to sectional view;
Figure 19 for cineration technics in the 5th composition technology of FFS type TFT-LCD array base palte first embodiment of the present invention after B6-B6 to sectional view;
Figure 20 in the 5th composition technology of FFS type TFT-LCD array base palte first embodiment of the present invention for the second time behind the etching technics B6-B6 to sectional view;
Figure 21 is the planimetric map of FFS type TFT-LCD array base palte second embodiment of the present invention;
Figure 22 be among Figure 21 C1-C1 to sectional view;
Figure 23 be among Figure 21 D1-D1 to sectional view;
Figure 24 is the process flow diagram of FFS type TFT-LCD manufacturing method of array base plate of the present invention;
Figure 25 is the process flow diagram of FFS type TFT-LCD manufacturing method of array base plate first embodiment of the present invention;
Figure 26 is the process flow diagram of FFS type TFT-LCD manufacturing method of array base plate second embodiment of the present invention;
Figure 27 is the process flow diagram of FFS type TFT-LCD manufacturing method of array base plate the 3rd embodiment of the present invention.
Description of reference numerals:
The 1-substrate; The 2-gate electrode; The 3-gate insulation layer;
The 4-semiconductor layer; The 5-doping semiconductor layer; 6-source electrode;
The 7-drain electrode; The 8-passivation layer; 9-deceives matrix;
The 11-grid line; The 12-data line; The 13-pixel electrode;
The 14-public electrode; The 20-photoresist; The 21-transparent conductive film;
22-deceives the matrix metallic film.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.Each layer film thickness and area size shape do not reflect the true ratio of FFS type TFT-LCD array base palte in the accompanying drawing, and purpose is an illustrative content of the present invention.
Fig. 1 is the planimetric map of FFS type TFT-LCD array base palte first embodiment of the present invention, and what reflected is the structure of a pixel cell, Fig. 2 be among Fig. 1 A1-A1 to sectional view, Fig. 3 be among Fig. 1 B1-B1 to sectional view.As Fig. 1～shown in Figure 3, the agent structure of FFS type TFT-LCD array base palte of the present invention comprises the grid line 11 that is formed on the substrate 1, data line 12, pixel electrode 13, public electrode 14, black matrix 9 and thin film transistor (TFT), grid line 11 and data line 12 have defined pixel region, pixel electrode 13, public electrode 14 and thin film transistor (TFT) are formed in the pixel region, grid line 11 is used for providing start signal or cut-off signals to thin film transistor (TFT), data line 12 is used for providing data-signal to pixel electrode 13, public electrode 14 is several electrode strips that is arranged in order, be used for forming fringe field with pixel electrode 13, black matrix 9 by the metallic film material preparation is formed on grid line 11, the top of data line 12 and thin film transistor (TFT), and be connected with public electrode 14, not only be used to block the light leak zone, and as the connecting bus of public electrode 14.Particularly, FFS type TFT-LCD array base palte of the present invention comprises grid line 11 and the gate electrode 2 that is formed on the substrate 1, and gate electrode 2 is connected with grid line 11; Gate insulation layer 3 is formed on grid line 11 and the gate electrode 2 and covers whole base plate 1; Active layer (comprising semiconductor layer 4 and doping semiconductor layer 5) is formed on the gate insulation layer 3 and is positioned at the top of gate electrode 2; Pixel electrode 13 is formed on the gate insulation layer 3 and is positioned at pixel region; One end of source electrode 6 is positioned on the active layer, the other end is connected with data line 12, one end of drain electrode 7 is positioned on the active layer, the other end is connected with pixel electrode 13, form the TFT channel region between source electrode 6 and the drain electrode 7, the doping semiconductor layer 5 of TFT channel region is etched away fully, and etches away the semiconductor layer 4 of segment thickness, and the semiconductor layer 4 of TFT channel region is come out; Passivation layer 8 is formed on the above-mentioned composition and covers whole base plate 1; Public electrode 14 is formed on the passivation layer 8; Black matrix 9 is formed on the above-mentioned composition and is positioned at the top of grid line 11, data line 12 and thin film transistor (TFT), directly is connected with public electrode 14 simultaneously.
Fig. 4～Figure 13 is the synoptic diagram of the FFS type TFT-LCD array base palte first embodiment manufacture process of the present invention, can further specify technical scheme of the present invention, below in the explanation, the alleged composition technology of the present invention comprises technologies such as photoresist coating, mask, exposure, etching and photoresist lift off, and photoresist is example with the positive photoresist.
Fig. 4 is FFS type TFT-LCD array base palte first embodiment of the present invention planimetric map after the composition technology for the first time, and what reflected is the structure of a pixel cell, Fig. 5 be among Fig. 4 A2-A2 to sectional view.At first adopt the method for magnetron sputtering or thermal evaporation, go up deposition grid metallic film at substrate 1 (as glass substrate or quartz base plate), adopt the normal masks plate to form the figure that comprises grid line 11 and gate electrode 2 by composition technology, gate electrode 2 is connected with grid line 11, as shown in Figure 4 and Figure 5.
Fig. 6 is FFS type TFT-LCD array base palte first embodiment of the present invention planimetric map after the composition technology for the second time, and what reflected is the structure of a pixel cell, Fig. 7 be among Fig. 6 A3-A3 to sectional view.Finish on the substrate of above-mentioned composition shown in Figure 4, using plasma strengthens chemical vapor deposition (being called for short PECVD) method and deposits gate insulation layer, semiconductive thin film and doped semiconductor films successively, adopt the normal masks plate to form the figure that comprises active layer by composition technology, active layer comprises semiconductor layer 4 and doping semiconductor layer 5, be formed on the gate insulation layer and be positioned at the top of gate electrode 2, as shown in Figure 6 and Figure 7.
Fig. 8 is FFS type TFT-LCD array base palte first embodiment of the present invention planimetric map after the composition technology for the third time, and what reflected is the structure of a pixel cell, Fig. 9 be among Fig. 8 A4-A4 to sectional view, Figure 10 be among Fig. 8 B4-B4 to sectional view.Finish on the substrate of above-mentioned composition shown in Figure 6, adopting the method deposit transparent conductive film of magnetron sputtering or thermal evaporation, adopting the normal masks plate in pixel region, to form the figure that comprises pixel electrode 13, as Fig. 8～shown in Figure 10 by composition technology.
Figure 11 is the planimetric map after the 4th composition technology of FFS type TFT-LCD array base palte first embodiment of the present invention, and what reflected is the structure of a pixel cell, Figure 12 be among Figure 11 A5-A5 to sectional view, Figure 13 be among Figure 11 B5-B5 to sectional view.Finish on the substrate of above-mentioned composition shown in Figure 8, adopt the method sedimentary origin of magnetron sputtering or thermal evaporation to leak metallic film, adopt the normal masks plate to form the figure that comprises data line 12, source electrode 6, drain electrode 7 and TFT channel region, as Figure 11～shown in Figure 13 by composition technology.After this composition technology, one end of source electrode 6 is positioned on the active layer, the other end is connected with data line 12, one end of drain electrode 7 is positioned on the active layer, the other end directly is connected with pixel electrode 13, forms the TFT channel region between source electrode 6 and the drain electrode 7, and the doping semiconductor layer 5 of TFT channel region is etched away fully, and etch away the semiconductor layer 4 of segment thickness, the semiconductor layer 4 of TFT channel region is come out.
Figure 14 is the planimetric map after the 5th composition technology of FFS type TFT-LCD array base palte first embodiment of the present invention, and what reflected is the structure of a pixel cell, Figure 15 be among Figure 14 A6-A6 to sectional view, Figure 16 be among Figure 14 B6-B6 to sectional view.Finish on the substrate of above-mentioned composition shown in Figure 11, adopt PECVD method deposit passivation layer 8, passivation layer 8 covers whole base plate 1.Adopt the method deposit transparent conductive film of magnetron sputtering or thermal evaporation afterwards, adopt the normal masks plate to form the figure that comprises public electrode 14, as Figure 14～shown in Figure 16 by composition technology.Public electrode 14 in the pixel region is several parallel and be arranged in order electrode strips, is used for forming fringe field with pixel electrode 13, and set up on grid line 11 end of several electrode strips, and data line 12 tops also are formed with public electrode 14 simultaneously.
At last, finish on the substrate of above-mentioned composition shown in Figure 14, adopt the black matrix metallic film of method deposition of magnetron sputtering or thermal evaporation, black matrix metallic film can adopt metals such as Mo, Al, Ti, Cr, Ta, Cu or AlNd.Form the figure comprise black matrix 9 by composition technology, and black matrix 9 is connected directly with public electrode 14, finishes composition technology the 6th time, as Fig. 1～shown in Figure 3.After this composition technology, black matrix 9 is formed on the top of grid line 11, data line 12, source electrode 6 and drain electrode 7, because the public electrode 14 of electrode strip structure is set up on grid line 11, therefore the black matrix 9 of grid line 11 tops is pressed on several electrode strips, realize that black matrix 9 is connected with the direct of public electrode 14, make black matrix 9 not only effectively block the light leak zone, and as the connecting bus of public electrode 14.In this composition technology, because public electrode is a transparent conductive film material, black matrix is a metallic film material, and the low etching liquid of etching transparent conductive film speed can be realized this composition process by selective etching metallic film speed height.
In the practical application,, be the light reflection that prevents that black matrix from producing because the black matrix of present embodiment is a metal material, can be at black matrix surface-coated one deck anti-reflection layer.Need to prove that structure shown in Figure 1 is one of version of present embodiment FFS type TFT-LCD array base palte,, also have the corresponding structure distortion according to the design philosophy of present embodiment.For example, in the present embodiment technical scheme, black matrix figure can only be arranged on the grid line top, and other positions (as positions such as data line and thin film transistor (TFT)s) top is not provided with black matrix, and these positions are blocked by the black matrix of correspondence position on the color membrane substrates.Black matrix figure can only be arranged on the data line top, top, other positions (as positions such as grid line and thin film transistor (TFT)s) is not provided with black matrix, and these positions are blocked by the black matrix of correspondence position on the color membrane substrates, this moment, the public electrode of electrode strip structure can interconnect by connection strap, and was connected with black matrix.For another example, black matrix figure can only be arranged on grid line and data line top, and other positions (as positions such as thin film transistor (TFT)s) top is not provided with black matrix, and these positions are blocked by the black matrix of correspondence position on the color membrane substrates.
Further, Fig. 4～preparation flow shown in Figure 16 also is one of manufacture method of present embodiment FFS type TFT-LCD array base palte, can form new preparation flow by increasing or reduce composition technology in the practical application.For example, the 5th composition technology can adopt shadow tone or gray mask plate to form public electrode and black matrix figure simultaneously by a composition technology.This preparation process of following simple declaration.
Figure 17 for resist exposure in the 5th composition technology of FFS type TFT-LCD array base palte first embodiment of the present invention develop back B6-B6 to sectional view.At first adopt PECVD method deposit passivation layer 8, adopt the method successive sedimentation transparent conductive film 21 and the black matrix metallic film 22 of magnetron sputtering or thermal evaporation then.On black matrix metallic film 22, apply one deck photoresist 20, adopt shadow tone or gray mask plate that photoresist 20 is exposed, make photoresist 20 form unexposed area A (the complete reserve area of photoresist), complete exposure area B (photoresist is removed the zone fully) and partial exposure area C (photoresist part reserve area) after the development, as shown in figure 17.Wherein unexposed area A is corresponding to black matrix figure region, partial exposure area C is corresponding to the common pattern of electrodes region, complete exposure area B is corresponding to the zone beyond the above-mentioned figure, and the thickness of unexposed area A photoresist is greater than the thickness of partial exposure area C photoresist.
Figure 18 in the 5th composition technology of FFS type TFT-LCD array base palte first embodiment of the present invention for the first time behind the etching technics B6-B6 to sectional view.By the first time etching technics etch away black matrix metallic film 22 and the transparent conductive film 21 of complete exposure area B, form the figure that comprises black matrix 9, as shown in figure 18.
Figure 19 for cineration technics in the 5th composition technology of FFS type TFT-LCD array base palte first embodiment of the present invention after B6-B6 to sectional view.By cineration technics, remove the photoresist of partial exposure area C, expose the black matrix metallic film 22 in this zone, as shown in figure 19.
Figure 20 in the 5th composition technology of FFS type TFT-LCD array base palte first embodiment of the present invention for the second time behind the etching technics B6-B6 to sectional view.By the second time etching technics etch away the black matrix metallic film 22 of partial exposure area C fully, form the figure that comprises public electrode 14, as shown in figure 20.
Peel off remaining photoresist at last, finish the 5th composition technology of TFT-LCD array base palte first embodiment of the present invention, as shown in Figure 3.
Figure 21 is the planimetric map of FFS type TFT-LCD array base palte second embodiment of the present invention, and what reflected is the structure of a pixel cell, Figure 22 be among Figure 21 C1-C1 to sectional view, Figure 23 be among Figure 21 D1-D1 to sectional view.As Figure 21～shown in Figure 23, present embodiment is a kind of malformation of aforementioned first embodiment, agent structure and aforementioned first embodiment are basic identical, different is, the present embodiment public electrode is positioned on the black matrix, the public electrode that is the electrode strip structure is set up on black matrix, realizes that public electrode is connected with the direct of black matrix.The present embodiment preparation process is also basic identical with the preparation process of aforementioned first embodiment, and different is that present embodiment forms black matrix figure earlier on passivation layer, form common pattern of electrodes afterwards again, and public electrode is connected with black matrix.Similarly, present embodiment can be coated with anti-reflection layer on the black matrix surface, and black matrix figure can only be arranged on grid line, data line or grid line and data line top, repeats no more here.
The invention provides a kind of FFS type TFT-LCD array base palte, be arranged on the array base palte by deceiving the matrix figure, and black matrix is connected with public electrode, make black matrix not only effectively block the light leak zone, and, efficiently solve the technological deficiency of the high and public electrode delay of existing structure production cost as the connecting bus of public electrode.Because the black matrix of metallic film material is formed on the top of grid line, data line, source electrode and drain electrode, therefore can effectively reduce black matrix width, improve aperture opening ratio.Be connected owing to black matrix all is arranged on the array base palte and directly with public electrode, therefore eliminated the defective of the public electrode delay of existing structure existence fully, can be widely used in fields such as large scale demonstration and LCD TV.
Figure 24 is the process flow diagram of FFS type TFT-LCD manufacturing method of array base plate of the present invention, comprising:
The invention provides a kind of FFS type TFT-LCD manufacturing method of array base plate, be formed on the array base palte by deceiving the matrix figure, and black matrix is connected with public electrode, make black matrix not only effectively block the light leak zone, and, efficiently solve the technological deficiency of the high and public electrode delay of existing structure production cost as the connecting bus of public electrode.Because the black matrix figure of preparation can adopt existing process equipment and technological process on array base palte, do not need to increase extra production equipment, reduced the equipment and the technology of the black matrix figure of preparation on color membrane substrates simultaneously, so the present invention effectively reduces production cost.
In technical scheme shown in Figure 24, step 1 specifically comprises:
Above-mentioned preparation process is introduced in earlier figures 4～technical scheme shown in Figure 13 in detail, repeats no more here.
Figure 25 is the process flow diagram of FFS type TFT-LCD manufacturing method of array base plate first embodiment of the present invention, and in technical scheme shown in Figure 24, step 2 comprises:
Step 211, finish deposit passivation layer and transparent conductive film on the substrate of abovementioned steps, adopting the normal masks plate to form the figure that comprises public electrode by composition technology, described public electrode is several electrode strips that is arranged in order;
Step 212, finishing on the substrate of abovementioned steps the black matrix metallic film of deposition, adopt the normal masks plate to form the figure that comprises black matrix by composition technology, described black matrix is connected with public electrode.
Present embodiment is a kind of technical scheme that adopts secondary composition technology to form black matrix and common pattern of electrodes, and black matrix is positioned at the public electrode top, the introduction in detail in aforementioned Figure 14～technical scheme shown in Figure 16 of this preparation process.
Figure 26 is the process flow diagram of FFS type TFT-LCD manufacturing method of array base plate second embodiment of the present invention, and in technical scheme shown in Figure 24, step 2 comprises:
Present embodiment is the technical scheme that composition technology of a kind of employing forms black matrix and common pattern of electrodes simultaneously, and black matrix is positioned at the public electrode top, the introduction in detail in aforementioned Figure 17～technical scheme shown in Figure 20 of this preparation process.
Figure 27 is the process flow diagram of FFS type TFT-LCD manufacturing method of array base plate the 3rd embodiment of the present invention, and in technical scheme shown in Figure 24, step 2 comprises:
Step 231, finish deposit passivation layer and black matrix metallic film on the substrate of abovementioned steps, adopting the normal masks plate to form the figure that comprises black matrix by composition technology;
Step 232, finish deposit transparent conductive film on the substrate of abovementioned steps, adopting the normal masks plate to form the figure that comprises public electrode by composition technology, described public electrode is connected with black matrix for several electrode strips that is arranged in order, described public electrode.
Present embodiment is a kind of technical scheme that adopts secondary composition technology to form black matrix and common pattern of electrodes, and public electrode is positioned at black matrix top.
On previous embodiment technical scheme basis, because the black matrix of the present invention is a metal material, be the light reflection that prevents that black matrix from producing, can after step 2, be increased in the step of black matrix surface-coated one deck anti-reflection layer.
It should be noted that at last: above invention is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferable invention, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (14)
1. FFS type TFT-LCD array base palte, comprise the grid line and the data line that are formed on the substrate and define pixel region, be formed with pixel electrode, thin film transistor (TFT) in the described pixel region and form the public electrode of fringe field with described pixel electrode, it is characterized in that, comprise that also described black matrix is connected with described public electrode by the black matrix of metallic film material preparation.
2. FFS type TFT-LCD array base palte according to claim 1 is characterized in that described thin film transistor (TFT) comprises gate electrode, active layer, source electrode and drain electrode, and described gate electrode is connected with grid line, and is formed on the substrate; Gate insulation layer is formed on grid line and the gate electrode and covers whole base plate; The active layer that comprises semiconductor layer and doping semiconductor layer is formed on the gate insulation layer and is positioned at the top of gate electrode; Pixel electrode is formed on the gate insulation layer and is positioned at pixel region; One end of source electrode is positioned on the active layer, and the other end is connected with data line, and an end of drain electrode is positioned on the active layer, and the other end is connected with pixel electrode, forms the TFT channel region between source electrode and the drain electrode; Passivation layer is formed on the above-mentioned composition and covers whole base plate.
3. FFS type TFT-LCD array base palte according to claim 2 is characterized in that, described public electrode is for several electrode strips that are arranged in order and be formed on the described passivation layer, and described black matrix is formed on the above-mentioned composition.
4. FFS type TFT-LCD array base palte according to claim 3 is characterized in that, described public electrode and black matrix are by the secondary composition technology that adopts the normal masks plate or adopt a composition technology of shadow tone or gray mask plate to form.
5. FFS type TFT-LCD array base palte according to claim 2 is characterized in that described black matrix is formed on the described passivation layer, and described public electrode is for several electrode strips that are arranged in order and be formed on the above-mentioned composition.
6. FFS type TFT-LCD array base palte according to claim 5 is characterized in that, described black matrix and public electrode are formed by the secondary composition technology that adopts the normal masks plate.
7. according to the described FFS type of arbitrary claim TFT-LCD array base palte in the claim 1～6, it is characterized in that described black matrix is positioned at the top of described grid line and/or data line.
8. FFS type TFT-LCD array base palte according to claim 7 is characterized in that described black matrix is positioned at the top of described thin film transistor (TFT).
9. FFS type TFT-LCD array base palte according to claim 7 is characterized in that described black matrix surface is provided with anti-reflection layer.
10. a FFS type TFT-LCD manufacturing method of array base plate is characterized in that, comprising:
On substrate, form the figure that comprises grid line, data line, pixel electrode and thin film transistor (TFT);
Form the figure that comprises public electrode and black matrix finishing on the substrate of abovementioned steps, described black matrix is connected with described public electrode.
11. FFS type TFT-LCD manufacturing method of array base plate according to claim 10 is characterized in that, described formation on substrate comprises that the figure of grid line, data line, pixel electrode and thin film transistor (TFT) comprises:
Deposition grid metallic film forms the figure that comprises grid line and gate electrode by composition technology on substrate;
Deposit gate insulation layer, semiconductive thin film and doped semiconductor films on the substrate of abovementioned steps successively finishing, form the figure that comprises active layer by composition technology, active layer comprises semiconductor layer and doping semiconductor layer, is formed on the gate insulation layer and is positioned at the top of gate electrode;
Finish deposit transparent conductive film on the substrate of abovementioned steps, comprising pattern of pixel electrodes by the formation of composition technology;
Sedimentary origin leaks metallic film on the substrate of abovementioned steps finishing, form the figure that comprises data line, source electrode, drain electrode and TFT channel region by composition technology, one end of described source electrode is positioned on the active layer, the other end is connected with data line, one end of described drain electrode is positioned on the active layer, the other end directly is connected with pixel electrode, forms the TFT channel region between described source electrode and the drain electrode.
12., it is characterized in that described formation comprises that the figure of public electrode and black matrix comprises according to claim 10 or 11 described FFS type TFT-LCD manufacturing method of array base plate:
Finish deposit passivation layer and transparent conductive film on the substrate of abovementioned steps, adopting the normal masks plate to form the figure that comprises public electrode by composition technology, described public electrode is several electrode strips that is arranged in order;
Finishing the black matrix metallic film of deposition on the substrate of abovementioned steps, adopt the normal masks plate to form the figure that comprises black matrix by composition technology, described black matrix is connected with public electrode.
13., it is characterized in that described formation comprises that the figure of public electrode and black matrix comprises according to claim 10 or 11 described FFS type TFT-LCD manufacturing method of array base plate:
Finish on the substrate of abovementioned steps at first deposit passivation layer, successive sedimentation transparent conductive film and black matrix metallic film then;
On black matrix metallic film, apply one deck photoresist;
Adopt shadow tone or gray mask plate that photoresist is exposed, make the complete reserve area of photoresist formation photoresist, photoresist remove zone and photoresist part reserve area fully after the development; Wherein the complete reserve area of photoresist is corresponding to black matrix figure region, and photoresist part reserve area is corresponding to the common pattern of electrodes region, and photoresist is removed the zone fully corresponding to the zone beyond the above-mentioned figure;
By the first time etching technics etch away black matrix metallic film and the transparent conductive film that photoresist is removed the zone fully, form the figure comprise black matrix;
By the photoresist of cineration technics removal photoresist part reserve area, expose the black matrix metallic film in this zone;
By the second time etching technics etch away the black matrix metallic film of photoresist part reserve area fully, form the figure that comprises public electrode;
Peel off remaining photoresist.
14., it is characterized in that described formation comprises that the figure of public electrode and black matrix comprises according to claim 10 or 11 described FFS type TFT-LCD manufacturing method of array base plate:
Finish deposit passivation layer and black matrix metallic film on the substrate of abovementioned steps, adopting the normal masks plate to form the figure that comprises black matrix by composition technology;
Finish deposit transparent conductive film on the substrate of abovementioned steps, adopting the normal masks plate to form the figure that comprises public electrode by composition technology, described public electrode is connected with black matrix for several electrode strips that is arranged in order, described public electrode.
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