CN202404869U

CN202404869U - Apparatus for detecting IGZO-TFT driving characteristic

Info

Publication number: CN202404869U
Application number: CN 201120338472
Authority: CN
Inventors: 王彬
Original assignee: GUANGDONG ZHONGXIAN TECHNOLOGY Co Ltd
Current assignee: GUANGDONG ZHONGXIAN TECHNOLOGY Co Ltd
Priority date: 2011-06-15
Filing date: 2011-09-09
Publication date: 2012-08-29
Anticipated expiration: 2021-09-09
Also published as: CN102832252A; CN102832109A; CN102832130A; CN102832251A; CN102832103A; CN202307906U; CN202487581U; CN102831850A; CN102832131A; CN202285237U; CN102832257A

Abstract

The utility model provides an apparatus for detecting IGZO-TFT driving characteristics, comprising an IGZO-TFT driving unit, a mask slice utilized in array preparation and a plurality of microcapsule electrophoresis display elements. The mask slice includes three functional zones of an aligning mark zone, a separate device zone and an array area. According to the detection apparatus, not only is the driving performance of the array TFT transistors detected, but also a single TFT transistor can be detected one by one, and simultaneously, the array quantity is set according to requirements, and the driving display function can be realized when the TFT array is driven in a single-pixel static state. Furtherly, the detection work efficiency and accuracy can be accelerated by employing the aligning mark zone.

Description

A kind of device that is used to detect the IGZO-TFT drive characteristic

Technical field

The utility model relates to IGZO thin film transistor (TFT) (TFT) and drives detection range, and more specifically, the utility model relates to the device that a kind of IGZO of detection thin film transistor (TFT) drives effect.

Background technology

Thin film transistor (TFT) is meant deposition layer of semiconductor film on substrate, goes out source, drain electrode through fabrication techniques such as photoetching, etchings, and grid and body form, and it is made up of gate insulation layer, active layer, gate electrode, source and drain electrode several sections.Fig. 1 is several frequently seen TFT structure, can be divided into two types: one type is top gate structure, claims just folded (Normal Staggered is called for short NS) structure again; One type is bottom grating structure, claims reciprocal cross folded (Inverted Staggered is called for short IS) structure again.Sedimentary sequence according to channel layer and source-drain electrode is different, and top grid, bottom grating structure have end contact and two kinds of forms of top contact again respectively.In the bottom gate top contact structure, can improve semiconductor structure and pattern through the interface of modifying insulation course, thereby improve the mobility of device.This fault of construction is that the photoetching process of source-drain electrode can pollute active layer.And in other a kind of bottom grating structure; The source-drain electrode photoetching process was carried out before the semiconductor layer deposition; Can not cause pollution to semiconductor layer; But electrode and insulation course exist step to be unfavorable for the injection of electric charge, and the exposed of active layer outside, need protective mulch to improve the stability of device usually.Top gate structure has requirements at the higher level to substrate, particularly requires in surfaceness and chemical stability.

Since the Hosono of Tokyo polytechnical university in 2004 reports the flexible and transparent TFT based on IGZO (In-Ga-Zn-O) preparation for the first time.IGZO-TFT has received the concern of research institution and industry member, and is being shown in Application for Field, especially the new display spare technology by developing.IGZO-TFT receives publicity and gets into the FPD application apace, and the characteristic that this and it display is inseparable, describes from electrical property, stability, uniformity below.

Outstanding electrical property

IGZO-TFT has higher mobility, generally between 1-100cm2/Vs.For example, people such as Kim M deposit the layer of silicon dioxide etching barrier layer on bottom grating structure IGZO-TFT, realized the TFT of the high mobility of 35.8cm2/Vs; The amorphous state IGZO-TFT of people such as the Ho-Nyun Lee of lg electronics report, its mobility is up to 95cm2/Vs.Except that higher mobility, IGZO-TFT also has low off-state current, and the minimum off-state current of IGZO-TFT reaches 10-14A, is less than 10-12A and be applied to usually that FPD requires for the off-state current of TFT; The IGZO-TFT defect concentration is also lower, is 1/10th of amorphous silicon TFT.

Homogeneity and stability preferably

Hayashi etc. are 96 bottom gate type IGZO-TFT devices of preparation on the substrate of 10mm * 10mm at area; Wherein semiconductor layer adopts the radio frequency magnetron sputtering method preparation; Each device has the wide length (being respectively 60 μ m and 10 μ m) of same size, finds that in test under the identical condition device represents the height consistance on important physical amounts such as threshold voltage, saturated mobility and the subthreshold value amplitude of oscillation by the gross.

The IGZO-TFT device of not annealing, stability is relatively poor, and through being higher than 300 ℃ annealing, and the defective in can passivating amorphous IGZO makes TFT device exhibits stability preferably.

Although IGZO film crystal pipe unit is created by a large amount of research and development; And still do not have at present a kind of detection, demo plant to be used for that thereby each orientation detects coming of new or whether the drive characteristic of the IGZO thin film transistor (TFT) developed reaches the manufacturing requirement; The current IGZO thin film transistor (TFT) that just need a kind ofly collect a plurality of test functions district drives and array prepares pick-up unit; Can be from single to a plurality of; From being distributed to integral body, comprehensive, the drive characteristic of the IGZO film crystal pipe unit of the detection coming of new that height is integrated.

The utility model content

For overcoming above-mentioned defective of the prior art, the utility model proposes a kind of device that is used to detect the IGZO-TFT drive characteristic.

This device comprises that IGZO-TFT driver element and array prepare used mask plate, several microcapsules Electronphoretic display units; This mask plate comprises three functional areas, is respectively: alignment mark regions, individual devices district, array region; Said alignment mark regions is at two edges of mask plate, and each edge adopts a plurality of square figures to serve as a mark; This square figure at each edge adopts the square figure that increases gradually from both ends to the middle, and it is little to have formed the two ends square, the structure that middle square is big; Said individual devices is distinguished two districts, and the first area is positioned at mask plate two rows topmost, amounts to 8 * 2 single TFT; Array region comprises at least two group patterns, and each array can display quantity according to the needs of reality and select.

Preferably, said 16 TFT are according to different four groups of A, B, C, the D of being divided into of channel width and length, and the corresponding respectively wide length of raceway groove is respectively 900 μ m and 60 μ m, 1200 μ m and 80 μ m, 1200 μ m and 60 μ m, 900 μ m and 80 μ m.

Preferably, in the zone, the lower left corner of mask plate 3 * 2 single TFT are arranged, be used to drive the microcapsules display unit, the wide length of its raceway groove is respectively 1200 μ m and 60 μ m, and the area of this area pixel electrode is bigger than conventional area, is 3mm * 3mm.

Preferably, one of them is 8 * 6 arrays in the said array; The display area of this 8 * 6 pixelated array is 28mm * 16mm, and the area of single pixel is 3.5mm * 3mm.The wide length of single TFT pixel raceway groove is 800 μ m and 60 μ m in 8 * 6 arrays, and the width of sweep trace is 100 μ m, and the width of signal wire is 150 μ m, and TFT source electrode is of a size of 3mm * 3mm.

Through this pick-up unit, not only can carry out the detection of driveability by array TFT transistor, and also can realize detecting one by one single TFT transistor; Simultaneously, also array quantity is set as required, and tft array can realize driving Presentation Function when single pixel static drive.In addition, adopt alignment mark regions can accelerate the efficient and the accuracy of testing.

Description of drawings

Fig. 1 illustrates several frequently seen TFT structure of the prior art;

The IGZO-TFT driver element is shown Fig. 2 a and array prepares used mask plate concrete graphic;

The IGZO-TFT driver element is shown Fig. 2 b and array prepares used mask plate explanation synoptic diagram;

Fig. 3 shows single IGZO-TFT and drives microcapsules display unit test circuit synoptic diagram;

Fig. 4 shows 8 * 6IGZO-TFT and drives microcapsules display unit test circuit synoptic diagram.

As shown in the figure; In order clearly to realize the structure of the embodiment of the utility model, marked specific structure and device in the drawings, but this is merely the signal needs; Be not that intention is limited to the utility model in this ad hoc structure, device and the environment; According to concrete needs, those of ordinary skill in the art can adjust these devices and environment or revise, and adjustment of being carried out or modification still are included in the scope of accompanying Claim.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment a kind of device that is used to detect the IGZO-TFT drive characteristic that the utility model provides is described in detail.

In the following description, with a plurality of different aspect of describing the utility model, yet, for the one of ordinary skilled in the art, can only utilize some or the entire infrastructure of the utility model or flow process to implement the utility model.For the definition of explaining, set forth specific number, configuration and order, but clearly, do not had also can to implement the utility model under the situation of these specific detail.In other cases, in order not obscure the utility model, will set forth no longer in detail for some well-known characteristics.

This device that is used to detect the IGZO-TFT drive characteristic mainly comprises mask plate and several microcapsules Electronphoretic display units of IGZO-TFT driver element.

Fig. 2 (a), Fig. 2 (b) prepare used mask plate concrete graphic and explanation synoptic diagram for IGZO-TFT driver element and the array that the utility model designed, and it is three districts that its structure is divided into:

Alignment mark regions.Alignment mark regions is at two edges of mask plate; Each edge adopts a plurality of square figures to serve as a mark; Wherein this square figure at each edge adopts the square figure that increases gradually from both ends to the middle, and it is little to have formed the two ends square, the structure that middle square is big.

The individual devices zone.Individual devices is distinguished two districts, and Fig. 2 (a) two rows are topmost seen in the first area, amount to 8 * 2 single TFT.These 16 TFT are according to different four groups of A, B, C, the D of being divided into of channel width and length, and the corresponding respectively wide length of raceway groove is respectively 900 μ m and 60 μ m, 1200 μ m and 80 μ m, 1200 μ m and 60 μ m, 900 μ m and 80 μ m.In Fig. 2 (a) zone, the lower left corner 3 * 2 single TFT are arranged, be used to drive the microcapsules display unit, the wide length of its raceway groove is respectively 1200 μ m and 60 μ m; The maximum characteristics in this zone are exactly that the area of pixel electrode (source electrode) is bigger; Be generally N * N, 2≤N≤4 wherein, unit is a millimeter (mm); Wherein being preferably 3mm * 3mm, mainly is in order to observe easily with showing the integrated driving of film.It is wherein following that to drive the used TFT figure of integrated demonstration about individual devices be exactly this regional TFT.

Array region.Comprise two group patterns in the mask plate, this array can display quantity according to the needs of reality and select, and wherein is preferably 8 * 6 arrays and 3 * 3, and the design parameter of the domain of two group patterns is the same.Be that example describes with 8 * 6 arrays below.The display area of 8 * 6 pixelated array is 28mm * 16mm, and the area of single pixel is 3.5mm * 3mm.The wide length of single TFT pixel raceway groove is 800 μ m and 60 μ m in array, and the width of sweep trace is 100 μ m, and the width of signal wire is 150 μ m, and TFT source electrode is of a size of 3mm * 3mm, simultaneously also as the pixel electrode of TFT.

The integrated demonstration of single IGZO-TFT device

Fig. 3 shows single IGZO-TFT and drives microcapsules display unit test circuit synoptic diagram.The TFT device substrate shows film laminating through cementing agent with microcapsules; Impose driving voltage then; Test its driving force; The voltage of public electrode is constant when drive showing, controls the voltage of drain electrode through the variation of control signal (gate electrode) voltage, makes upper and lower base plate produce voltage difference and realizes white and black displays.When TFT was in gating, the voltage of public electrode was 15V, and the voltage of gate electrode is 40V; Source class voltage is 0V, and the voltage of drain electrode is about 0V, and the voltage of upper substrate is higher than bottom crown like this; Make electronegative white particles move, white when human eye can be watched to upper substrate; If the voltage of source electrode is 30V, in this state, drain voltage probably is 30V, and bottom crown voltage is higher than top crown voltage, makes the black particles of positively charged assemble to upper substrate, and the color that human eye can be seen is a black.

Flexible 8 * 6IGZO-TFT array drives integrated demonstration

The big advantage that active TFT shows is exactly the cross effect that can eliminate in the passive drive, and so-called cross effect is meant when applying voltage on the pixel, near also have certain voltage on the not selected pixel.Flexible IGZO-TFT array and microcapsules show that film is integrated into active display screen; It is more similar with the method for testing of individual devices that it drives method of testing; 8 active pixel TFT of the 6th row that we have carried out in 8 * 6 arrays carry out the line scanning test of 8 unlike signals, and analyze to the problem that is produced in showing.

When the active display pixel structure of 8 * 6 arrays being carried out turntable driving demonstration test, for ease, we just verify the 6th row in 8 * 6 pixels, and the preceding five-element's sweep trace all connects low level.

Fig. 4 shows 8 * 6IGZO-TFT and drives microcapsules display unit test circuit synoptic diagram.Original state is all is input as low level, and the 6th row is shown as complete white; Then since the 6th first (being designated as C61) of row scanning, during scanning, data-signal is increased to 30V from 0V, and theoretically, TFT is in conducting state, and the voltage of pixel electrode is about 30V, shows black; And the like, signal electrode is successively from C61 to C68, when the gating pixel; The data line ground connection of other pixel is so other pixel all is a white; Can find out, for the scanning of each row, the bright dark solid colour of microcapsules; The independence that the TFT device drive is described is pretty good, can not produce cross effect.

From prepared IGZO-TFT and the integrated realization white and black displays of microcapsules electrophoretic display thin film, comprise the white and black displays of single active driving pixels and the active driving pixels white and black displays of 8 * 6 arrays, the result summarizes as follows:

1. single flexible IGZO-TFT device can be realized the microcapsules display driver preferably.

2.8 * 6 flexible IGZO-TFT arrays are when single pixel static drive; Can realize driving Presentation Function, but be expert at or column scan when drive realizing that function shows that the display performance that each pixel appears is inconsistent; And effect and pixel electrode in scan electrode and the demonstration of signal electrode place are inconsistent; Theoretically, these two kinds of problems can independently solve source-drain electrode and pixel electrode through improving uniformity of film and increasing a photoetching respectively.

What should explain at last is; Above embodiment only limits in order to the technical scheme of description the utility model rather than to the present technique method; The utility model can extend to other modification, variation, application and embodiment on using, and therefore thinks that all such modifications, variation, application, embodiment are in the spirit and teachings of the utility model.

Claims

1. device that is used to detect the IGZO-TFT drive characteristic, this device comprises that IGZO-TFT driver element and array prepare used mask plate, several microcapsules Electronphoretic display units; It is characterized in that: this mask plate comprises three functional areas, is respectively: alignment mark regions, individual devices district, array region; Said alignment mark regions is at two edges of mask plate, and each edge adopts a plurality of square figures to serve as a mark; This square figure at each edge adopts the square figure that increases gradually from both ends to the middle, and it is little to have formed the two ends square, the structure that middle square is big; Said individual devices is distinguished two districts, and the first area is positioned at mask plate two rows topmost, amounts to 8 * 2 single TFT; Array region comprises at least two group patterns, and each array can display quantity according to the needs of reality and select.

2. be used to detect the device of IGZO-TFT drive characteristic according to claim 1; It is characterized in that; Said 16 TFT are according to different four groups of A, B, C, the D of being divided into of channel width and length, and the corresponding respectively wide length of raceway groove is respectively 900 μ m and 60 μ m, 1200 μ m and 80 μ m, 1200 μ m and 60 μ m, 900 μ m and 80 μ m.

3. like the said device that is used to detect the IGZO-TFT drive characteristic of claim 2; It is characterized in that; In the zone, the lower left corner of mask plate 3 * 2 single TFT are arranged, be used to drive the microcapsules display unit, the wide length of its raceway groove is respectively 1200 μ m and 60 μ m; The area of this area pixel electrode is bigger than conventional area, is 3mm * 3mm.

4. be used to detect the device of IGZO-TFT drive characteristic according to claim 1, it is characterized in that, one of them is 8 * 6 arrays in the said array; The display area of this 8 * 6 pixelated array is 28mm * 16mm, and the area of single pixel is 3.5mm * 3mm.

5. like the said device that is used to detect the IGZO-TFT drive characteristic of claim 4; It is characterized in that the wide length of single TFT pixel raceway groove is 800 μ m and 60 μ m in 8 * 6 arrays, the width of sweep trace is 100 μ m; The width of signal wire is 150 μ m, and TFT source electrode is of a size of 3mm * 3mm.