CN203241671U - Fan-out line structure of array substrate and display panel - Google Patents

Abstract

The utility model discloses a fan-out line structure of an array substrate and a display panel. The fan-out line structure comprises a plurality of fan-out lines arranged in a fan-out area of the array substrate, and the resistance values of the fan-out lines with different lengths are different. Each fan-out line comprises a first conducting film, at least parts of the fan-out lines are covered by additional conducting films, the resistance values of the parts of the fan-out lines are smaller than those of other fan-out lines, the areas of the additional conducting films covering the fan-out lines with the larger resistance values are smaller than those of the additional conducting films covering the fan-out lines with the smaller resistance values, and additional capacitance values are formed between the additional conducting films and the first conducting films. According to the fan-out line structure of the array substrate, due to the fact that the additional capacitances will generate obvious RC delay on the signals passing through the fan-out lines, for the fan-out lines with the smaller resistance values, the influence of delay on the signals can be generated through the additional capacitances, and the signals of the fan-out lines with the smaller resistance values are made to achieve a synchronous state with the longer fan-out lines with larger resistance values.

Description

Fan-out line structure and the display panel of array base palte

Technical field

The utility model relates to field of display devices, in particular, relates to a kind of fan-out line structure and display panel of array base palte.

Background technology

Liquid crystal panel is the significant components of liquid crystal indicator, and lower in the driving of the cooperation of backlight module and driving circuit, liquid crystal panel can demonstrate image.

As shown in Figure 1, array base palte 100 at liquid crystal panel is provided with tft array zone 120, signal wire and TFT have been covered with in the tft array zone, drive circuit board 130 is by fan-out line 111(fanout line) signal wire of array base palte is connected with the leg of drive circuit board, the setting area of fan-out line 111 then is called fanout area (fanout area).

Because leg close-packed arrays and signal wire dispersed arrangement, that is to say that leg is different to the distance of signal wire, just caused like this situation of resistance inequality after the fan-out line setting, the fan-out line of the different resistance of different length can make the waveform of signal deform, thereby can affect the display quality of liquid crystal indicator.At present conventional array base palte fanout area line resistance homogenization all is to finish by the coiling design, as shown in Figure 2, formed bend 112 by coiling at the fan-out line 111 of fanout area, utilized bend to increase length and then the increase resistance of fan-out line, made signal be tending towards synchronous.Bend 112 has increased the height H of fanout area, its of the air line distance of two end points of fan-out line shorter (being the air line distance of two end points of fan-out line) need to around line just longer, because the restriction of fan-out line gap length, thereby air line distance shorter fan-out line in two ends then needs to arrange a plurality of bends 112 and improves winding lengths (among the figure every fan-out line only illustrate two bends), so then can cause the height H in fan-out zone to increase, and then have influence on the border width of liquid crystal indicator, be unfavorable for the design of narrow frame.But signal waveform deforms and not only is the impact of fan-out line resistance, and stray capacitance also is the key factor that affects signal waveform; Be illustrated in figure 3 as liquid crystal panel at the sectional view in fan-out zone, the ITO conductive layer 201(tin indium oxide on the first conducting film 106, the second conducting film 104 and the color membrane substrates 200 on the array base palte 100 in the fan-out line 111) between have stray capacitance C _LC, because the existence of stray capacitance has also caused the impact of time-delay on signal, still, the fan-out line of different length, first, second conducting film is different from ITO conductive layer overlapping area on the color membrane substrates 200, so stray capacitance C _LCSize also different, not identical for the impact that signal causes yet.

The utility model content

Technical problem to be solved in the utility model provides fan-out line structure and the display panel of the array base palte that a kind of fanout area height is little, display effect is more outstanding when being applied to display device, frame is narrower.

The purpose of this utility model is achieved through the following technical solutions: a kind of fan-out line structure of array base palte comprises: be arranged in many fan-out lines of array base palte fanout area, the resistance of the fan-out line that length is different in described many fan-out lines has difference; Described every fan-out line comprises one first conducting film, be coated with the additional guide electrolemma on the fan-out line of its resistance of at least a portion less than other fan-out line in described many fan-out lines, the area that covers described additional guide electrolemma on the larger fan-out line of resistance is less than the area of the additional guide electrolemma that covers on the less fan-out line of resistance, formation one additional capacitor between described additional guide electrolemma and described the first conducting film.

Preferably, the additional guide electrolemma on described every fan-out line is identical at the width that this fan-out line covers described the first conducting film, and the length of the additional guide electrolemma that covers on the fan-out line of described different resistance is different.Cover width is identical, thereby can different overlay lengths be set according to the difference of fan-out line length, obtains corresponding area coverage, and then obtains corresponding additional capacitor value.

The length of the conducting film that preferably, covers on the described fan-out line is:

L ₂₂=ε _r1d ₂（L ₁ ²-L ₂ ²）/L ₂(d ₁ε _r2-d ₂ε _r1)；

Described L ₁Be the length of a fan-out line in many fan-out lines, this L ₁Long fan-out line is line of reference, described L ₂Be the length of the fan-out line that is coated with the additional guide electrolemma, described L ₂₂Described length is L ₂Fan-out line on cover the length of additional guide electrolemma, described ε _R1Be the relative dielectric constant of liquid crystal layer in the liquid crystal panel, described d ₁Be the thickness of described liquid crystal layer, described ε _R2Be the dielectric relative dielectric constant between described the first conducting film and the described additional guide electrolemma, described d ₂Thickness for described insulation course.

Preferably, described line of reference is one the longest in described many fan-out lines.Utilize the longest fan-out line as reference, calculating the needed area coverage of other fan-out line, and the longest fan-out line does not need to increase the additional guide electrolemma because resistance own is larger again.

Preferably, the dielectric between described additional guide electrolemma and described the first conducting film is the passivation dielectric film.Passivating film has good insulation effect.

Preferably, an end points of at least a portion fan-out line has difference to the air line distance of another end points in described many fan-out lines, and wherein the air line distance of at least one two end points fan-out line of air line distance that is shorter than two end points of other fan-out line is provided with for the bend that lengthens this fan-out line.Because fan-out line is the combined influence of resistance R and stray capacitance C on the impact of signal waveform, the time constant of fan-out line signal delay is τ=RC, the time constant of signal delay of the fan-out line of each bar is equated, then can adjust resistance R and capacitor C simultaneously, to reach best technological requirement, designing requirement and product requirement.

Preferably, described the first conducting film is metal conductive film.The conductive effect of metal conductive film is outstanding, and the signal lag impact is less.

Preferably, described additional guide electrolemma is indium tin oxide conductive film.Indium tin oxide conductive film can directly add in the manufacturing process of array base palte, thereby does not need to increase in addition technique.

Preferably, described fan-out line also comprises the second conducting film that is arranged under described the first conducting film.The fan-out line of double-deck conducting film has preferably stability.

A kind of display panel comprises above-mentioned arbitrary described fan-out line structure.

The utility model is by being coated with the additional guide electrolemma at least part of resistance less than the fan-out line of other fan-out line in many fan-out lines of array base palte, the area that covers described additional guide electrolemma on the larger fan-out line of resistance is less than the area of the additional guide electrolemma that covers on the less fan-out line of resistance, formation one additional capacitor between described additional guide electrolemma and described the first conducting film.This additional capacitor can produce obvious RC carryover effects to the signal by fan-out line, thereby, for the less fan-out line of resistance, can come signal is produced the impact that postpones by additional capacitor, the signal of the fan-out line that make it and grow, resistance is larger reaches synchronous state.

Description of drawings

Fig. 1 is the structural representation of array base palte in the available liquid crystal panel,

Fig. 2 is that the fan-out line of the fanout area of array base palte in the available liquid crystal panel is arranged synoptic diagram,

Fig. 3 is A directional profile figure among Fig. 2,

Fig. 4 is the liquid crystal panel fan-out line structural representation of the utility model embodiment one,

Fig. 5 is B directional profile figure among Fig. 4,

Fig. 6 is the utility model embodiment two fan-out line structural representations,

Fig. 7 is the partial enlarged drawing of E among Fig. 6,

Fig. 8 is the structural drawing that arranges of the utility model embodiment three fan-out lines and additional guide electrolemma,

Fig. 9 is the structural drawing that arranges of the utility model embodiment four fan-out lines and additional guide electrolemma,

Figure 10 is the sectional view of fanout area in the utility model embodiment five liquid crystal panels,

Figure 11 is the sectional view of fanout area in the utility model embodiment six liquid crystal panels,

Figure 12 is the sectional view of fanout area in the utility model embodiment seven liquid crystal panels.

Wherein, 100, array base palte, 101, additional guide electrolemma, 102, the first insulation course, the 103, second insulation course, the 104, second conducting film, 105, glass substrate, the 106, first conducting film, 111, fan-out line, 112, bend, 120, tft array zone, 130, drive circuit board, 200, color membrane substrates, 201, ITO conducting film, 202, black matrix, 203, glass substrate.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing and preferred embodiment.

Embodiment one

Such as Fig. 4 and shown in Figure 5, and with reference to figure 1, present embodiment provides a kind of liquid crystal panel, and this liquid crystal panel comprises: array base palte 100 and color membrane substrates 200, and wherein, color membrane substrates 200 comprises: glass substrate 203, black matrix 202 and ITO conducting film 201; And the fan-out line of array base palte 100 is arranged on fanout area (with reference to figure 1), and its structure comprises: many fan-out lines 111 that are arranged in glass substrate 105, and the resistance of the fan-out line that length is different in described many fan-out lines 111 has difference; Described every fan-out line 111 comprises one first conducting film 106 at least, its resistance of at least a portion less than the fan-out line 111x(of other fan-out line as shown in Figure 5 in described many fan-out lines 111, be convenient difference, this fan-out line is designated as 111x) on be coated with additional guide electrolemma 101, has the first insulation course 102(passivation insulation between additional guide electrolemma 101 and the first conducting film 106, PVA) as dielectric, the area that covers described additional guide electrolemma 101 on the larger fan-out line 111 of resistance is less than the area (as shown in Figure 4) of the additional guide electrolemma that covers on the less fan-out line 111 of resistance, described additional guide electrolemma 101 can with Array Com(public electrode), the Ground(ground wire) or other electrode conductions, form an additional capacitor C between described additional guide electrolemma 101 and described the first conducting film 106 _X

Described additional capacitor C _XBe the electric capacity of a parasitism, can produce RC to the signal by fan-out line 111 and postpone (RCdelay), thereby, for the less fan-out line 111 of resistance, can pass through additional capacitor C _XCome signal is produced the impact that postpones, make itself and itself exist the signal of long fan-out line 111 of larger delay to reach synchronous state.We can calculate the timeconstantτ of fan-out line 111 signal delays by following formula:

τ=RC

Wherein, R is the resistance of fan-out line, and C is electric capacity.That is to say that the time constant of fan-out line 111 signal delays is the coefficient results of resistance R and capacitor C.

Optimize structure as a kind of of present embodiment, described the first insulation course 102 adopts the passivation insulation (PVA, passivation layer) that has the good insulation effect, and described the first conducting film 106 is metal conductive film, the conductive effect of metal conductive film is outstanding, and the signal lag impact is less.Described additional guide electrolemma 101 is indium tin oxide conductive film (ITO), and indium tin oxide conductive film can directly add in the processing procedure of array base palte, thereby does not need to increase in addition technique.Described fan-out line 111 also comprises the second conducting film 104 that is arranged under described the first conducting film 106, described the second conducting film 104 is also for being provided with the second insulation course 103(gate insulator between metal conductive film the first conducting film 106 and the second conducting film 104, GI, gate insulator), adopt the fan-out 111 of double-deck conducting film to have preferably stability, certainly, also can make the 3rd layer of conducting film or more of increase.

Because the length of every fan-out line is different, thereby its resistance is different, reach the synchronous state of signal, then is applied to the additional capacitor C on each bar fan-out line 111 _XAlso different, and additional capacitor C _XSize cover on the fan-out line 111 with it and relevant with the overlapping size of the first conducting film 106.Such as Fig. 3 and shown in Figure 5, do not cover between the fan-out line 111 of additional guide electrolemma 101 and the ITO conducting film 201 on the color membrane substrates 200 and have stray capacitance C yet _LC, this stray capacitance C _LCThe first conducting film 104, the second conducting film 106 by fan-out line 111 form with ITO conducting film 201.This stray capacitance C _LCBecause the thickness of liquid crystal layer is larger, its size is far smaller than additional capacitor C _X, thereby its RC of causing postpone also limited, although it is so, for calculate accurately, when calculating electric capacity on the affecting of fan-out line, also it to be counted.Stray capacitance size between fan-out line 111 and the ITO conducting film 201 can be calculated according to following computing formula:

$C=\frac{{\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_r\·S}{d}=\frac{{\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_r\·L\·W}{d}$

Wherein ε 0 and ε r are respectively absolute dielectric constant and liquid crystal relative dielectric constant, and L and W represent respectively length and the width of fan-out line, and d is the thickness of liquid crystal layer, are generally about 3～4 μ m.

Below, we further describe the utility model by calculating the area that should cover the additional guide electrolemma on the fan-out line.

Calculate for convenient, additional guide electrolemma on every fan-out line 111 on this fan-out line with the width identical (forming the useful area of electric capacity) of the lap of described the first conducting film 106, the length of the additional guide electrolemma 111 that covers on the fan-out line 111 of different resistance is different, and the short fan-out line of length need to cover longer additional guide electrolemma 101.In the present embodiment, the width of additional guide electrolemma 101 is consistent with the width of fan-out line, thereby the width of additional guide electrolemma 101 and the lap of described the first conducting film 106 is identical, and this sampling technology is simple, and is easy to operate.

Determine the overlay length of additional capacitor on fan-out line, need in many fan-out lines, select one as line of reference, as shown in Figure 4, present embodiment selects the longest fan-out line 111a as line of reference, as with reference to the size that calculates the upper electric capacity of fan-out line 111b that is coated with additional guide electrolemma 101, namely calculate the length that cover the additional guide electrolemma 101 on the fan-out line 111b with 111a.Concrete computation process is as follows:

If the resistance of fan-out line 111a and fan-out line 111b is respectively R ₁And R ₂, they be calculated as follows:

$R_1=\frac{R_s\·L_1}{W}$

$R_2=\frac{R_s\·L_2}{W}$

For the fan-out line 111a that covers without any the additional guide electrolemma, shown in Fig. 3 or 5, its electric capacity mainly is that the first conducting film 106, the second conducting film 104 in the fan-out line 111 forms with ITO conducting film 201 on the color membrane substrates 200, and we can establish its stray capacitance is that C1(is C _LC), then

$C_1=\frac{{\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_{r1}\·L_1\·W}{d_1}$

Wherein, ε ₀Absolute dielectric constant, ε _R1The relative dielectric constant of liquid crystal in the liquid crystal panel, L ₁, W is to be respectively length and the width of fan-out line 111a, d ₁The thickness of liquid crystal layer in the liquid crystal panel, wherein L ₁Can be by present layout(fan-out) instrument calculates (the layout instrument is designer's specific purpose tool).For fan-out line 111a, timeconstantτ ₁For:

${\mathrm{\τ}}_1=R_1\·C_1=\frac{R_s\·{\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_{r1}\·L_1^2}{d_1}$

Because time constant only and L ₁Square be directly proportional, so can reach a conclusion: the time constant of the longest fan-out line 111a of both sides is maximum in the fan-out line of whole fanout area, i.e. τ ₁, in the algorithm here, just take this time constant as benchmark.

If on the fan-out line 111b, the partial-length that is not covered by ITO conducting film 101 is L ₂₁, the partial-length that is covered by ITO conducting film 101 is L ₂₂, they satisfy following relation:

L ₂＝L ₂₁+L ₂₂

Not by the capacitor C of ITO conducting film 101 cover parts ₂₁:

$C_{21}=\frac{{\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_{r1}\·L_{21}\·W}{d_1}$

By the capacitor C of ITO cover part ₂₂:

$C_{22}=\frac{{\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_{r2}\·L_{22}\·W}{d_2}$

ε wherein _R2And d ₂Representing respectively the first insulation course 102 is passivation insulation (PAV), and relative dielectric constant ε r and the liquid crystal of PAV are more or less the same, but because thickness is little, thus in the situation that area equates new capacitor C _XCan be far longer than on fan-out line and the color membrane substrates TIO and conduct electricity film formed electric capacity, as shown in Figure 5 in the present embodiment, C _XGenerally be C _LCAbout 10 times.

Capacitor C ₂₁With capacitor C ₂₂Be parallel connection relation, the therefore capacitor C of whole fan-out line 111b ₂:

C ₂＝C ₂₁+C ₂₂

When adjusting the impedance of fan-out line, with the timeconstantτ of fan-out line 111a ₁Be benchmark:

τ ₂＝R ₂·C ₂＝τ ₁

Can set up thus system of equations and solve from this:

$L_{21}=\frac{{\mathrm{\ϵ}}_{r1}{d}_2{L}_1^2-{\mathrm{\ϵ}}_{r2}{d}_1{L}_2^2}{L_2(d_2{\mathrm{\ϵ}}_{r1}-d_1{\mathrm{\ϵ}}_{r2})}$

$L_{22}=\frac{{\mathrm{\ϵ}}_{r1}{d}_2(L_1^2-L_2^2)}{L_2(d_1{\mathrm{\ϵ}}_{r2}-d_2{\mathrm{\ϵ}}_{r1})}$

L wherein ₂₂Namely be the length of the additional guide electrolemma 101 that on fan-out line 111b, should cover.

We can know thus needs the area of the ITO conducting film that covers to be on the fan-out line 111b:

S=WL ₂₂

A kind of improvement as present embodiment, as shown in Figure 4, an end points of at least a portion fan-out line has difference to the air line distance of another this end points in many fan-out lines 111, still take fan-out line 111a and fan-out line 111b as example, the air line distance of two end points of fan-out line 111b is shorter than the air line distance of two end points of fan-out line 111a, thereby present embodiment is by being provided for lengthening the bend 112 of this fan-out line 111b thereon.Because fan-out line is the combined influence of resistance R and stray capacitance C on the impact of signal waveform, the time constant of fan-out line signal delay is τ=RC, that is to say, the time constant of signal delay of the fan-out line of each bar is equated, can adjust resistance R and capacitor C simultaneously, to reach best technological requirement, designing requirement and product requirement.In the present embodiment, increase covering additional guide electrolemma by the basis in coiling and form additional capacitor, thereby can reduce winding length, differ too large fan-out line for the time constant of resistance and line of reference, can select coiling to cover the additional guide electrolemma with increasing.Particularly for the LCD TV of large-size, this scheme is more suitable, and the larger problem of height H can solve again the synchronous problem of fan-out line signal because coiling is too much both can to have solved fanout area.

Embodiment two

Such as Figure 6 and Figure 7, different from embodiment one is that the width of additional guide electrolemma 101 according to size and the process requirements of panel, can be selected different width less than the width of fan-out line 111 in the present embodiment.

Embodiment three

Be illustrated in figure 8 as another kind of embodiment, the width of additional guide electrolemma 101 is greater than the width of fan-out line 111, this embodiment can guarantee that additional guide electrolemma 101 and the width of the lap of the first conducting film are that width with described the first conducting film is identical all the time, thereby has guaranteed to obtain the degree of accuracy of additional capacitor.

Embodiment four

As shown in Figure 9, all differently from above-described embodiment be, the additional guide electrolemma 101 that present embodiment adopts a monoblock to cover on the many fan-out lines reaches the purpose of obtaining additional capacitor, it is more easy that this kind mode seems in the processing procedure of panel, do not need to make complicated mask, cost of manufacture is relatively low.

Embodiment five

As shown in figure 10, different from embodiment one is, what fan-out line 111 adopted is the individual layer conductive structure, namely, the hop of fan-out line 111 only is provided with one deck the first conducting film 106, this first conducting film 106 is metal conductive film, and the insulating medium of additional capacitor CX is the first insulation course 102, and this first insulation course 102 is passivation insulation (PAV).This setup can reduce the processing procedure of a pavement slab, but its stability does not have the height of embodiment one.

Embodiment six

As shown in figure 11, the fan-out line 111 of present embodiment also is to adopt the individual layer conductive structure, and different from embodiment five is that the insulating medium that adds electric capacity CX is the first insulation course 102 and the second insulation course 103, namely passivation insulation and gate insulator.

Embodiment seven

As shown in figure 12; the fan-out line 111 of present embodiment still adopts the individual layer conductive structure; but different is; what additional guide electrolemma 101 adopted is metal conductive film; that the second insulation course 103 is gate insulator being coated with the first insulation course 102 on the additional guide electrolemma 101 in order to protect the insulating medium between these additional guide electrolemma 101, the first conducting films 106 and the described additional guide electrolemma 101.

Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that implementation of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.

Claims (10)

1. the fan-out line structure of an array base palte is characterized in that, comprising:

Many the fan-out lines that are arranged in the array base palte fanout area, the resistance of the fan-out line that length is different in described many fan-out lines has difference;

Described every fan-out line comprises one first conducting film,

Be coated with the additional guide electrolemma on the fan-out line of its resistance of at least a portion less than other fan-out line in described many fan-out lines, the area that covers described additional guide electrolemma on the larger fan-out line of resistance is less than the area of the additional guide electrolemma that covers on the less fan-out line of resistance, formation one additional capacitor between described additional guide electrolemma and described the first conducting film.

2. the fan-out line structure of array base palte as claimed in claim 1, it is characterized in that, additional guide electrolemma on described every fan-out line width with described the first conducting film lap on this fan-out line is identical, and the length of the additional guide electrolemma that covers on the fan-out line of described different resistance is different.

3. the fan-out line structure of array base palte as claimed in claim 2 is characterized in that, the length of the conducting film that covers on the described fan-out line is:

L ₂₂=ε _r1d ₂（L ₁ ²-L ₂ ²）/L ₂(d ₁ε _r2-d ₂ε _r1)；

Described L ₁Be the length of a fan-out line in many fan-out lines, this L ₁Long fan-out line is line of reference, described L ₂Be the length of the fan-out line that is coated with the additional guide electrolemma, described L ₂₂Described length is L ₂Fan-out line on cover the length of additional guide electrolemma, described ε _R1Be the relative dielectric constant of liquid crystal layer in the liquid crystal panel, described d ₁Be the thickness of described liquid crystal layer, described ε _R2Be the dielectric relative dielectric constant between described the first conducting film and the described additional guide electrolemma, described d ₂Be described dielectric thickness.

4. the fan-out line structure of array base palte as claimed in claim 3 is characterized in that, described line of reference is one the longest in described many fan-out lines.

5. the fan-out line structure of array base palte as claimed in claim 1 is characterized in that, the dielectric between described additional guide electrolemma and described the first conducting film is the passivation dielectric film.

6. the fan-out line structure of array base palte as claimed in claim 1, it is characterized in that, an end points of at least a portion fan-out line has difference to the air line distance of another end points in described many fan-out lines, and wherein the air line distance of at least one two end points fan-out line of air line distance that is shorter than two end points of other fan-out line is provided with for the bend that lengthens this fan-out line.

7. the fan-out line structure of array base palte as claimed in claim 1 is characterized in that, described the first conducting film is metal conductive film.

8. the fan-out line structure of array base palte as claimed in claim 1 is characterized in that, described additional guide electrolemma is indium tin oxide conductive film or metal conductive film.

9. the fan-out line structure of array base palte as claimed in claim 1 is characterized in that, described fan-out line also comprises the second conducting film that is arranged under described the first conducting film.

10. a display panel is characterized in that, comprises arbitrary described fan-out line structure such as claim 1-9.

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