KR100592239B1 - A method of injecting an electroluminescent solution into cells of an electroluminescent display panel by simultaneously driving three inkjet heads - Google Patents

Abstract

)만큼 3 개의 잉크젯 헤드들이 회전된다. 수평 간격(d1) 조정 단계에서는, 회전각(

)만큼 회전된 상태에서 3 개의 잉크젯 헤드들의 노즐 간격(D_N)이 셀 피치(P/3)와 일치되도록 3 개의 잉크젯 헤드들 사이의 수평 간격(d1)이 조정된다. 주입 단계에서는, 수평 간격(d1)이 조정된 3 개의 잉크젯 헤드들이 수평 및 수직 이동되면서 적색 셀, 녹색 셀, 및 청색 셀에 동시에 각 색상의 전계발광 용액이 주입된다.The present invention provides a method of simultaneously injecting three inkjet heads whose nozzle pitch (D) is longer than the pixel pitch (P) to inject an electroluminescent solution of each color into a red cell, a green cell, and a blue cell. (Y) adjustment step, rotation step, horizontal interval d1 adjustment step, and injection step. In the vertical gap Y adjustment step, the vertical gap Y between the three inkjet heads aligned with the horizontal direction as the longitudinal direction is adjusted. In the rotating step, the rotation angle according to the nozzle pitch D and the pixel pitch P (

3 inkjet heads are rotated by. In the horizontal interval d1 adjustment step, the rotation angle (

), The horizontal spacing d1 between the three inkjet heads is adjusted such that the nozzle spacing D _{N of the} three inkjet heads coincides with the cell pitch P / 3 in the rotated state. In the injection step, the electroluminescent solution of each color is injected simultaneously into the red cells, the green cells, and the blue cells while the three inkjet heads having the horizontal interval d1 adjusted horizontally and vertically.

Description

Method for injecting electro-luminescence solution into cells of electro-luminescence display panel by driving 3 inkjet-heads simultaneously}

1 is a side cross-sectional view showing a state in which an electroluminescent solution is injected into a cell of an electroluminescent display panel by an inkjet head.

2 is a view showing a conventional method of driving an inkjet head to inject an electroluminescent solution into cells of an electroluminescent display panel.

3 is a side cross-sectional view showing a state in which an electroluminescent solution is injected into a cell of an electroluminescent display panel by three inkjet heads simultaneously driven according to the present invention.

4A shows three inkjet heads to be driven simultaneously in accordance with the present invention.

FIG. 4B is a view showing three inkjet heads of FIG. 4A arranged in accordance with the present invention.

FIG. 5 is a flow chart showing the driving algorithm of the controller for alignment of FIG. 4B.

FIG. 6A illustrates a state in which an electroluminescent solution is simultaneously injected into odd-numbered cells among first to twelfth cells.

6B is a view showing a state in which an electroluminescent solution is injected into odd-numbered cells among the thirteenth to twenty-fourth cells simultaneously.

6C is a view illustrating a state in which an electroluminescent solution is simultaneously injected into odd-numbered cells among the twenty-fifth to twenty-ninth cells.

FIG. 7A is a diagram illustrating a state in which an electroluminescent solution is simultaneously injected into even-numbered cells among first to twelfth cells.

FIG. 7B is a view illustrating a state in which an electroluminescent solution is simultaneously injected into even-numbered cells among the thirteenth to twenty-fourth cells.

FIG. 7C is a view illustrating a state in which an electroluminescent solution is simultaneously injected into even-numbered cells among the twenty-fifth to twenty-ninth cells.

<Explanation of symbols for the main parts of the drawings>

H ... inkjet head, N1, N2, N3, N4 ... nozzle,

IW ... bulkhead, EL ... electroluminescent solution,

CP ... conductive paste, CE ... cell electrode,

GS ... glass substrate, C _R ... red cell,

C _G ... green cells, C _B ... blue cells,

H _R ... inkjet head for red, H _G ... inkjet head for green,

H _B ... blue inkjet head, N _R1 ... first nozzle of the red head,

N _G1 ... first nozzle of green head, N _B1 ... first nozzle of blue head,

EL _R ... red electroluminescent solution, EL _G ... green electroluminescent solution,

EL _B ... blue electroluminescent solution, CE _R ... red-cell electrode,

CE _G ... green-cell electrode, CE _B ... blue-cell electrode,

P ... pixel pitch, D ... nozzle pitch,

...회전각,P / 3 ... cell pitch,

... rotation angle,

Y ... vertical spacing, d1 ... horizontal spacing,

D _N ... Nozzle spacing, N _R1 , N _R2 , N _R3 , N _R4 ... Nozzle of the red head,

N _G1 , N _G2 , N _G3 , N _G4 ... nozzles for green heads, N _B1 , N _B2 , N _B3 , N _B4 ... nozzles for blue heads.

The present invention relates to a method of injecting an electroluminescent solution in the manufacturing process of an electroluminescent display panel, and more specifically, to each cell by driving an inkjet head whose nozzle pitch (D) is longer than the pixel pitch (P). It relates to a method of injecting a color electroluminescent solution.

FIG. 1 shows a state in which an electroluminescent solution EL is injected into a cell of an electroluminescent display panel by an inkjet head H. Referring to FIG. Referring to FIG. 1, the electroluminescent solution EL is formed through the nozzle N1 of the inkjet head H in a state where the partition wall IW, the cell electrode CE, and the conductive paste CP are formed on the glass substrate GS. ) Is injected. Polyimide is mainly used as the material of the partition wall IW. As such, after the electroluminescent solution EL is injected into all the cells of the display panel, a scan electrode is formed thereon.

)만큼 기울어짐으로써 각 노즐들(N1 내지 N4) 사이의 간격이 화소 피치(P)와 일치되게 한다.FIG. 2 shows a conventional method of driving one inkjet head H to inject an electroluminescent solution into cells of an electroluminescent display panel. 1 and 2, the unit pixel of the electroluminescent display panel includes a red cell C _R , a green cell C _G , and a blue cell C _B. One inkjet head H is provided with a plurality of nozzles, for example four nozzles N1 to N4. Here, it is almost impossible to manufacture the inkjet head H such that the nozzle pitch d coincides with the pixel pitch P. FIG. That is, since the nozzle pitch d is longer than the pixel pitch P, the inkjet head H is rotated when the electroluminescent solution EL is injected.

Tilt by) allows the spacing between the nozzles N1 to N4 to coincide with the pixel pitch P. FIG.

As the pixel pitch P is shorter than the nozzle pitch d, it is difficult to align the plurality of heads. Thus, in the related art, only one head H is driven to drive each cell C _R , C _G , C _B. ) Was injected with an electroluminescent solution (EL). For example, the electroluminescent solution EL is injected into all the red cells C _R of the panel, and then the electroluminescent solution EL is injected into all the green cells C _G. Thereafter, the electroluminescent solution EL is injected into all the blue cells C _B.

According to the conventional injection method as described above, since the electroluminescent solution EL is injected into the red cells C _R , the green cells C _G , and the blue cells C _B at different times, the precision of the injection Fall, there is a problem that the injection time is long.

SUMMARY OF THE INVENTION An object of the present invention is to simultaneously drive three inkjet heads having a nozzle pitch D longer than a pixel pitch P in the manufacturing process of an electroluminescent display panel in which red cells, green cells, and blue cells form a unit pixel. By injecting the electroluminescent solution of each color into the red cell, the green cell, and the blue cell at the same time, it is to provide a method of injecting an electroluminescent solution which can increase the precision of the injection and reduce the injection time.

In order to achieve the above object, the present invention provides three inkjet heads having a nozzle pitch D longer than the pixel pitch P in the manufacturing process of the electroluminescent display panel in which the red cells, the green cells, and the blue cells form the unit pixels. A method of simultaneously driving and injecting an electroluminescent solution of each color into a red cell, a green cell, and a blue cell, the method comprising a vertical gap Y adjustment step, a rotation step, a horizontal gap d1 adjustment step, and an injection step do.

)만큼 상기 3 개의 잉크 젯 헤드들이 회전된다. 상기 수평 간격(d1) 조정 단계에서는, 상기 회전각(

)만큼 회전된 상태에서 상기 3 개의 잉크젯 헤드들의 노즐 간격(D_N)이 셀 피치(P/3)와 일치되도록 상기 3 개의 잉크젯 헤드들 사이의 수평 간격(d1)이 조정된다. 상기 주입 단계에서는, 상기 수평 간격(d1)이 조정된 3 개의 잉크젯 헤드들이 수평 및 수직 이동되면서 적색 셀, 녹색 셀, 및 청색 셀에 동시에 각 색상의 전계발광 용액이 주입된다.In the vertical gap Y adjustment step, the vertical gap Y between the three inkjet heads aligned with the horizontal direction as the longitudinal direction is adjusted. In the rotating step, the rotation angle according to the nozzle pitch (D) and the pixel pitch (P)

The three ink jet heads are rotated by. In the horizontal interval d1 adjusting step, the rotation angle (

), The horizontal spacing d1 between the three inkjet heads is adjusted such that the nozzle spacing D _{N of} the three inkjet heads coincides with the cell pitch P / 3. In the injecting step, three inkjet heads of which the horizontal interval d1 is adjusted are horizontally and vertically moved, and the electroluminescent solution of each color is simultaneously injected into the red cells, the green cells, and the blue cells.

According to the electroluminescent solution injection method of the present invention, the nozzle spacing (D _N ) of the three inkjet heads by the performing the horizontal step (d1) adjusting step matches the cell pitch (P / 3), so that the injection By performing the step, the three inkjet heads may be driven simultaneously to inject the electroluminescent solution of each color into the red cell, the green cell, and the blue cell at the same time. Accordingly, the precision of the injection can be increased, and the injection time can be reduced.

)이

의 수학식에 의하여 설정된다. 상기 수평 간격(d1) 조정 단계에서, 상기 수평 간격(d1)이

의 수학식에 의하여 설정된다. Preferably, in the rotating step, the rotation angle (

)this

It is set by the following equation. In the adjusting the horizontal interval d1, the horizontal interval d1 is

It is set by the following equation.

Hereinafter, embodiments according to the present invention will be described in detail.

3 shows a state in which an electroluminescent solution is injected into a cell of an electroluminescent display panel by three inkjet heads H _R / H _G / H _B driven simultaneously according to the present invention. Referring to FIG. 3, three inkjet heads H _R / H are formed in a state in which the partition wall IW, the cell electrodes CE _R , CE _G , and CE _B , and the conductive paste CP are formed on the glass substrate GS. The electroluminescent solutions EL _R , EL _G and EL _B of each color are simultaneously injected through the nozzles N _R1 , N _G1 and N _B1 of _G / H _B ). Polyimide is mainly used as the material of the partition wall IW. As such, after the electroluminescent solution EL is injected into all the cells of the display panel, a scan electrode is formed thereon.

4A shows three inkjet heads to be driven simultaneously in accordance with the present invention. 3 and 4A, the unit pixel of the electroluminescent display panel includes a red cell C _R , a green cell C _G , and a blue cell C _B. Each of the red inkjet head H _R , the green inkjet head H _G , and the blue inkjet head H _{B is} provided with a plurality of nozzles, for example, four nozzles N1 to N4. .

)의 조정, 및 잉크젯 헤드들(H_R,H_G,H_B) 사이의 수평 간격(d1)의 조정이 필요하다. As shown in FIG. 4A, in a state in which the nozzle pitch D is longer than the pixel pitch P, the electroluminescent solution EL _R , of each color using three heads H _R , H _G and H _B is used. To simultaneously inject EL _G , EL _B ), the adjustment of the vertical gap Y between the inkjet heads H _R , H _G , H _B , and the rotation angle according to the nozzle pitch D and the pixel pitch P (

) And the horizontal spacing d1 between the inkjet heads H _R , H _G , H _B.

4B shows a state in which the red inkjet head H _R , the green inkjet head H _G , and the blue inkjet head H _B of FIG. 4A are aligned according to the present invention. In FIG. 4B, reference numerals N _R1 , N _R2 , N _R3 , and N _R4 denote nozzles of the red head H _R , and N _G1 , N _G2 , N _G3 , and N _{G4 denote} the green head H _G. The nozzles, and N _B1 , N _B2 , N _B3 , and N _B4 , point to the nozzles H _B of the blue head, respectively. FIG. 5 shows the driving algorithm of the controller for alignment of FIG. 4B. 4A, 4B, and 5, the injection method according to the present invention will be described in order as follows.

)만큼 3 개의 잉크젯 헤드들(H_R,H_G,H_B)이 회전된다(단계 S2). 여기서, 회전각

는 아래의 수학식 1에 의하여 설정된다. First, the vertical distance Y between the three inkjet heads H _R , H _G , H _B aligned with the horizontal direction as the longitudinal direction (see FIG. 4A) is adjusted according to the set value (step S1). Next, the rotation angle according to the nozzle pitch D and the pixel pitch P

) Three inkjet heads H _R , H _G , H _B are rotated (step S2). Where the angle of rotation

Is set by Equation 1 below.

)만큼 회전된 상태에서 3 개의 잉크젯 헤드들(H_R,H_G,H_B)의 노즐 간격(D_N)이 셀 피치(P/3)와 일치되도록 3 개의 잉크젯 헤드들(H_R,H_G,H _B) 사이의 수평 간격(d1)이 조정된다(단계 S2). 여기서, 수평 간격 d1은 아래의 수학식 2에 의하여 설정된다. Next, the rotation angle (

) Of the three ink-jet head in a rotated state by (H _R, H _G, nozzle spacing H _B) (D _N) of the three ink-jet head such that the match cell pitch _{(P / 3) (H R} , H G The horizontal interval d1 between and H _B is adjusted (step S2). Here, the horizontal interval d1 is set by Equation 2 below.

Then, if the nozzle spacing D _N in the current state is within the allowable range of the cell pitch P / 3, the process ends, otherwise, the process moves to the step S2 for more accurate calculation and setting.

Referring to FIG. 6A, when 29 cells exist in one horizontal line of the panel, an electroluminescent solution is simultaneously injected into odd-numbered cells among the first to twelfth cells. Referring to FIG. 6B, after the injection of FIG. 6A is completed, an electroluminescent solution is simultaneously injected into odd-numbered cells among the thirteenth to twenty-fourth cells. Referring to FIG. 6C, after the injection of FIG. 6B is completed, an electroluminescent solution is simultaneously injected into odd-numbered cells among the twenty-fifth to twenty-ninth cells.

Referring to FIG. 7A, after the injection of FIG. 6C is completed, the electroluminescent solution is simultaneously injected into even-numbered cells among the first to twelfth cells. Referring to FIG. 7B, after the injection of FIG. 7A is completed, an electroluminescent solution is simultaneously injected into even-numbered cells among the thirteenth to twenty-fourth cells. Referring to FIG. 7C, after the injection of FIG. 7B is completed, an electroluminescent solution is simultaneously injected into even-numbered cells among the twenty-fifth to twenty-ninth cells.

According to the injection method of Figures 6a to 7c, the electroluminescent solution is injected while skipping by one cell, it is possible to minimize the effect of the overflow of the injection solution. Of course, in contrast to the above injection sequence, it can be injected in the order of FIGS. 7A-> 7B-> 7C-> 6A-> 6B-> 6C.

As described above, according to the electroluminescent solution injection method according to the present invention, the nozzle spacing D _N of the three inkjet heads coincides with the cell pitch P / 3 by performing the horizontal spacing d1 adjusting step. Therefore, by performing the injection step, three inkjet heads may be driven simultaneously to inject the electroluminescent solution of each color into the red cell, the green cell, and the blue cell at the same time. Accordingly, the precision of the injection can be increased, and the injection time can be reduced.

The present invention is not limited to the above embodiments, but may be modified and improved by those skilled in the art within the spirit and scope of the invention as defined in the claims.

Claims (5)

In the manufacturing process of the electroluminescent display panel in which the red cells, the green cells, and the blue cells constitute the unit pixels, three inkjet heads having a nozzle pitch D longer than the pixel pitch P are simultaneously driven to produce red cells, green cells, And simultaneously injecting an electroluminescent solution of each color into a blue cell, Adjusting the vertical spacing Y between the three inkjet heads aligned with the horizontal direction as the longitudinal direction; Rotation angle according to the nozzle pitch D and the pixel pitch P

Rotating the three inkjet heads by; The rotation angle (

Adjusting the horizontal spacing d1 between the three inkjet heads so that the nozzle spacing D _{N of} the three inkjet heads coincides with a cell pitch P / 3 in the rotated state by; And Injecting an electroluminescent solution of each color into a red cell, a green cell, and a blue cell simultaneously while horizontally and vertically moving the three inkjet heads whose horizontal spacing d1 is adjusted. The method of claim 1, wherein in rotating the three inkjet heads, The rotation angle (

)this

Electroluminescent solution injection method is set by the equation. The method of claim 2, wherein in adjusting the horizontal distance d1, The horizontal spacing d1 is

Electroluminescent solution injection method is set by the equation. According to claim 1, In the step of injecting the electroluminescent solution of each color, The electroluminescent solution injection method in which the electroluminescent solution of each color is injected into the even cells after being injected into the odd cells. According to claim 1, In the step of injecting the electroluminescent solution of each color, The electroluminescent solution injection method in which the electroluminescent solution of each color is injected into the even cells after being injected into the even cells.

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