CN203038925U

CN203038925U - Organic electroluminescence screen interface circuit

Info

Publication number: CN203038925U
Application number: CN 201220744084
Authority: CN
Inventors: 邱勇; 尤沛升; 王龙; 张嵩
Original assignee: Tsinghua University; Beijing Visionox Technology Co Ltd; Kunshan Visionox Display Co Ltd
Current assignee: Tsinghua University; Beijing Visionox Technology Co Ltd; Kunshan Visionox Display Co Ltd
Priority date: 2012-12-31
Filing date: 2012-12-31
Publication date: 2013-07-03
Anticipated expiration: 2022-12-31

Abstract

The utility model discloses an organic electroluminescence screen interface circuit. The organic electroluminescence screen comprises anode regions and cathode regions. The cathode regions are connected through several cathode electrode lead groups. The anode regions are connected through several anode electrode lead groups. All the anode electrode lead groups and all the cathode electrode lead groups are led to one side of the organic electroluminescence screen respectively and are bound to positive and negative poles through a flexible printed circuit board. By using the organic electroluminescence screen interface circuit provided in the utility model, related production materials of ACF, FPC and the like are saved; production technology processes of a module can be simplified and a yield rate of the production can be increased.

Description

Interface circuit of organic electroluminescent screen

Technical Field

The present invention relates to an interface circuit of an organic electroluminescent display, and more particularly, to an interface circuit of an organic electroluminescent display capable of outputting PIN simultaneously.

Background

The organic electroluminescence principle is that an organic material is used as a light emitting layer, a cathode layer and an anode layer are arranged on two sides of the light emitting layer, the anode layer is arranged on a substrate, the anode layer and the cathode layer are respectively connected with an upper current through an anode electrode lead and a cathode electrode lead, and the organic material of the light emitting layer can emit light. Therefore, the organic electroluminescent device is widely used in a large-sized organic electroluminescent screen.

In the design of the screen body I/O side circuit board interface of the conventional organic electroluminescent screen, the screen body I/O side circuit board interface of the organic electroluminescent screen generally has a PIN (PIN) at two sides or a PIN at four sides.

FIG. 1 is a circuit diagram of an I/O terminal interface of a circuit board of an organic electroluminescent display panel with PINs on two sides in the prior art. As shown in fig. 1, an anode region 11 and two cathode regions 12 are formed symmetrically at upper and lower sides of the inside of the organic electroluminescent panel 1, respectively. Two of the cathode regions 12 are respectively located at the left and right sides of the anode region 11. The cathode regions 12 are connected by cathode lead groups (not shown), and the anode regions 11 are connected by anode lead groups (not shown). The anode lead group and the cathode lead group are respectively disposed at the peripheral edge of the organic electroluminescent panel 1 to form lead regions such that a portion of the anode region 11 (dotted frame) in the middle forms a display region 14 of the organic electroluminescent panel 1.

Aiming at the circuit board structure of the organic electroluminescent screen 1 shown in fig. 1, in the process of manufacturing an I/O terminal interface of the circuit board structure, firstly, a plurality of anode lead groups and a plurality of cathode lead groups are led out from two cathode areas 12 positioned at the upper and lower sides of the I/O terminal of the organic electroluminescent screen 1 and an anode area 11 positioned in the middle; and then connected by upper and

lower lead groups

13 and 15, respectively, and then bound to upper and lower flexible circuit boards (FPCs). It will be understood by those skilled in the art that each FPC includes one anode region 11 and two cathode regions 12 on each FPC for the I/O terminals of the organic electroluminescent panel 1.

Then, in the module manufacturing process, the positive and negative electrodes of the two FPCs bound at the upper and lower ends are respectively soldered on a PCB (printed circuit board) board to connect the positive and negative electrodes of the two FPCs through the PCB board, thereby forming an I/O terminal interface of the organic electroluminescent screen 1.

FIG. 2 is a circuit diagram of an I/O terminal interface of a circuit board of a prior art organic electroluminescent display with four PIN-shaped sides. As shown in fig. 2, in which the inside of the organic electroluminescent panel 2 is divided into an anode region 21 in the middle of four sides and four cathode regions 22 at four corners of four sides; thus, the upper, lower, left and right sides of the I/O terminal of the organic EL panel are symmetrically formed with an anode region 21 and two cathode regions 22, respectively.

For the structure of the organic electroluminescent screen 2 shown in fig. 2, in the process of manufacturing the interface, firstly, a plurality of anode lead groups and a plurality of cathode lead groups need to be led out from two cathode regions 12 located at the upper and lower sides of the organic electroluminescent screen 2 and one anode region 11 located in the middle; then connected together through four lead groups 23, 24, 25, 26 of up, down, left, right, respectively, and then bound to one FPC of up, down, left, right, respectively, wherein each FPC has one anode region 21 and two cathode regions 22, respectively, each FPC having only positive and negative poles, as will be understood by those skilled in the art;

then, in the module manufacturing process, four FPCs on the upper side, the lower side, the left side and the right side are respectively welded on a PCB, and then positive electrodes and negative electrodes of the four FPCs are connected through the PCB.

The design of the organic electroluminescent screen with the PINs at two sides and the PINs at four sides can achieve the effect of uniformity of the display effect of the whole organic electroluminescent screen. In the organic el panel having PINs on both sides or four sides, the lead lines on each side are symmetrically designed, so that the impedance is uniform for each side. Therefore, the display effect is consistent under the same driving voltage.

However, in the above interface circuit design, two or four FPCs need to be bonded, so two (two sides with PINs) and four (four sides with PINs) fog (film On glass) processes need to be performed in the module manufacturing process. That is, a plurality of FPCs need to be bonded to the I/O terminal of the organic electroluminescent panel through an ACF (anisotropic conductive film) after the dummy pressure and the home pressure.

Disclosure of Invention

In view of the above, the present invention is directed to an I/O interface circuit design of an organic electroluminescent display circuit board with only one PIN.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides an interface circuit of an illumination screen, which comprises an anode region and a cathode region; the cathode regions are connected through a plurality of cathode electrode lead groups, and the anode regions are connected through a plurality of anode electrode lead groups; wherein,

all the anode lead group and the cathode lead group are respectively led to one side of the lighting screen and are jointly bound to the positive pole and the negative pole of the lighting screen through a flexible circuit board.

Wherein,

the line width of the lead is proportional to the length of the lead;

wherein,

and the ITO layer in the anode lead and cathode lead area structure is covered with a metal layer.

The utility model provides an organic electroluminescent screen interface circuit has saved relevant production materials such as ACF, FPC, but also can simplify the production process flow of module to can improve the production yield.

Drawings

FIG. 1 is a circuit diagram of an I/O terminal interface of an organic electroluminescent screen with PIN on two sides;

FIG. 2 is a circuit diagram of an I/O terminal interface of an organic electroluminescent screen with four PIN-shaped sides;

fig. 3 is a circuit diagram of an I/O terminal interface of an organic electroluminescent display according to the present invention.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and embodiments of the present invention.

Fig. 3 is a schematic diagram of an I/O interface circuit of an organic electroluminescent panel circuit board according to an embodiment of the present invention. Fig. 3 is a modification of the structure of the organic electroluminescent panel 2 shown in fig. 2. That is, the inside of the organic electroluminescent panel 3 includes an anode region 31 in the middle of four sides and four cathode regions 32 on four corners;

according to the utility model discloses an in the interface design, at first, all anode region 31 and the negative pole district 32 with the inside upper and lower, left and right four sides of organic electroluminescent screen circuit board 3 all cause one of them side of organic electroluminescent screen circuit board 3, for example, the following through positive pole lead group and negative pole lead group.

As shown in fig. 3, the lead groups of the anode region 31 on the upper side of the organic el panel circuit board 3 are led to the PIN-out ends on the lower side of the organic el panel 3 toward both sides, respectively; lead groups of the cathode regions 32 on the two sides of the upper end of the organic electroluminescent screen 3 are respectively merged with the cathode regions 32 on the left side and the right side of the organic electroluminescent screen 3 close to the upper end and led to a PIN outlet end on the lower side of the organic electroluminescent screen 3; meanwhile, lead wire groups of anode regions 31 on the left side and the right side of the organic electroluminescent screen 3 are respectively led to PIN outlet ends below the organic electroluminescent screen 3, cathode regions 32 on the left side and the right side of the organic electroluminescent screen close to the lower end are respectively merged with cathode regions 32 on the two ends below the organic electroluminescent screen 3 and led to the PIN outlet ends below the organic electroluminescent screen 3, and the anode region below the organic electroluminescent screen 3 is directly led to the PIN outlet ends.

It is easy to understand that, the PIN ends of the lower side of the organic electroluminescent screen circuit board 3 are 9 PINs in total, 5 PINs are anodes, and 4 PINs are cathodes; then, by binding one FPC, all anode and cathode lead groups are respectively connected together inside the FPC, and then the positive/negative electrodes are led out through the FPC, so that only positive and negative PIN are arranged at the PIN outlet end of the FPC.

Through the design, the PIN can be connected with the four sides of the whole organic electroluminescent screen circuit board through one FPC.

It can be understood that the arrangement of the anode lead region and the cathode lead region is not only the one shown in fig. 3, but also the cathode region can be arranged in the middle of the display screen, the anode regions are arranged on both sides, and the way of routing the lead group is not limited to the one shown in fig. 3, and the routing is performed according to the arrangement of the cathode region and the anode region.

It should be noted that the circuit shown in fig. 3 is an improved design of the display panel structure shown in fig. 2, but the design is not limited to an improved mode, and the general design idea of the present invention is to introduce all the cathode lead groups and the anode lead groups to one side of the organic electroluminescent panel, so as to save the cost of the production materials such as FPC, ACF, etc. Meanwhile, in the production process, the binding times of FOG are saved, the process cost is reduced, and the production yield can be improved.

Preferably, in order to achieve the display uniformity of the organic electroluminescent panel, all the leads inside the circuit board 3 of the organic electroluminescent panel are covered with a metal layer by using an ITO layer, and since the square resistance of the metal layer (MOALMO) is much smaller than that of ITO, the lead resistance is reduced, and the resulting resistance difference is much smaller.

Preferably, the lead lines are made wider as the lead lines are longer, and thus the impedance difference between the lead line groups can be reduced.

The method ensures that the voltage drop difference caused by the impedance difference among all the leads has no obvious influence on the display effect.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. An interface circuit of an organic electroluminescent screen, the organic electroluminescent screen comprising an anode region and a cathode region; the cathode regions are connected through a plurality of cathode electrode lead groups, and the anode regions are connected through a plurality of anode electrode lead groups; the method is characterized in that:

all the anode lead groups and the cathode lead groups are respectively led to one side of the organic electroluminescent screen and are commonly bound to the positive and negative poles thereof through a flexible circuit board.

2. The interface circuit of claim 1, wherein:

the line width of the lead line is proportional to the length of the lead line.

3. The interface circuit of claim 1, wherein:

and the ITO layer in the anode lead and the cathode lead structure is covered with a metal layer.