CN111755621B

CN111755621B - Organic electroluminescent screen body and preparation method thereof

Info

Publication number: CN111755621B
Application number: CN202010483208.9A
Authority: CN
Inventors: 许显斌; 李栋栋; 陈旭
Original assignee: Guan Yeolight Technology Co Ltd
Current assignee: Guan Yeolight Technology Co Ltd
Priority date: 2020-06-01
Filing date: 2020-06-01
Publication date: 2024-03-01
Anticipated expiration: 2040-06-01
Also published as: CN111755621A

Abstract

The invention discloses an organic electroluminescent screen body and a preparation method thereof, wherein one or more injection electrodes are bound around the OLED screen body, and the injection electrodes are electrically connected with corresponding electrode inflow areas arranged in luminous areas of the OLED screen body through luminous area leads or connecting wires and are used for inputting current to each local luminous area in the OLED screen body. The invention can realize the control of the individual current of each injection electrode or a plurality of different injection electrodes, thereby achieving the purpose of controlling the brightness distribution of the screen.

Description

Organic electroluminescent screen body and preparation method thereof

Technical Field

The invention relates to the technical field of OLED devices, in particular to an organic electroluminescent screen body and a preparation method thereof.

Background

The OLED luminous screen body is a current-driven luminous device, and the luminous intensity is in direct proportion to the current injection size. In order to obtain the change of the real picture, two driving modes of PM or AM-TFT are generally adopted for fine control of pixelation.

Both the PM and AM-TFT driving methods are methods for performing real-world picture or brightness control based on the concept of independent pixelation. But this idea brings with it several new problems: the pixelized design brings about a reduction in aperture ratio and a more complicated process, and a higher number of pixels (high resolution) is required for a higher continuous screen, and circuit control becomes extremely complicated, etc.

For a general light source, in order to improve the overall brightness uniformity of the light source, or to obtain simple brightness variation and dynamic effects, the design and manufacturing difficulties are greatly improved by adopting the two control methods.

Fig. 1 is an equivalent circuit diagram of an OLED light emitting panel in the prior art, and due to the influence of factors such as the shape of the panel, electrode materials, organic electric current transmission materials, uneven distribution of wiring resistance values of electrodes in the panel (due to uneven line width, thickness, etc.), uneven distribution of electric current transmission in the panel (uneven evaporation thickness and concentration), etc., the distribution of light emitting uniformity of the panel is always a difficult problem for manufacturing and using the OLED, and when an input current is transmitted to an equivalent light emitting diode unit, there is a great difference in actual current.

Fig. 2 is a schematic diagram of electrode design and brightness distribution of an OLED screen in the prior art, and it can be seen that two angles near the positive electrode have the highest brightness due to the shortest current loop (relatively smaller corresponding resistance). The brightness non-uniformity is quite obvious, and the non-uniform distribution is more obvious when the current is larger and the brightness is larger, especially the positions of the corners and edges of the luminous area, and the color display difference of the images is quite obvious.

Disclosure of Invention

Therefore, the invention aims to solve the technical problem of brightness uniformity of the OLED screen body, and can realize the control of the whole brightness uniformity and dynamic display of the screen body by distributing design of electrodes and circuit wiring of the screen body and local current control of a light-emitting area. To this end, the present invention provides an organic electroluminescent screen and a method of manufacturing the same.

In order to achieve the aim of the invention, the invention adopts the following technical scheme:

in one aspect, the invention provides an organic electroluminescent screen, wherein one or more injection electrodes are bound around the OLED screen, and the injection electrodes are electrically connected with corresponding electrode inflow regions arranged in the OLED screen luminescent regions through luminescent region leads or connecting wires, so as to input current to each local luminescent region in the OLED screen.

Further, the injection electrode comprises one or more anode electrodes and cathode electrodes distributed at the edge of the light-emitting area of the OLED screen body, the anode electrodes are respectively and electrically connected with the anode local inflow areas in the corresponding light-emitting areas of the OLED screen body, and the cathode electrodes are electrically connected with the cathode local inflow areas in the corresponding light-emitting areas of the OLED screen body.

Preferably, the plurality of injection electrodes are bound at the same edge of the light emitting area of the OLED panel, each local light emitting area in the OLED panel is led out through a light emitting area lead, each electrode inflow area is distributed at each edge of the light emitting area of the OLED panel and connected with a corresponding light emitting area lead, and each injection electrode is electrically connected with each corresponding electrode inflow area through a connecting wire.

Or preferably, the light-emitting area lead is a light-emitting area lead with different shapes or a whole anode or an anode and an auxiliary electrode.

Or preferably, the injection electrodes are distributed at a plurality of edges of the OLED screen body light-emitting area and are electrically connected with the corresponding electrode inflow areas arranged at the edges of the OLED screen body light-emitting area, the anode electrode is arranged at least one edge of the OLED screen body light-emitting area, and the cathode electrode is arranged at the rest edges of the OLED screen body light-emitting area opposite to the anode electrode.

The width of the electrode inflow region is larger than 1 mu m and smaller than or equal to the edge length of the OLED screen body luminous region; the OLED screen body is a top emission screen body, a bottom emission screen body or a double-sided light transmission screen body.

And an electrode inflow region is also distributed in the luminous region of the OLED screen body, and one or more injection electrodes are connected with the corresponding electrode inflow region through a section of luminous region lead wire isolated from the luminous region of the OLED screen body.

An anode lower insulating layer is arranged between the screen substrate and the anode, an insulating layer opening is formed in the anode lower insulating layer, a luminous area lead is arranged on the lower layer of the anode lower insulating layer, and the luminous area lead is conducted with the corresponding electrode inflow area upwards through the insulating layer opening.

The screen structure further comprises a controller electrically connected with one or more injection electrodes, and the controller performs independent or multi-thread control on each injection electrode according to the brightness distribution of the OLED screen light-emitting area.

The invention also provides a preparation method of the organic electroluminescent screen, which comprises the following steps:

controlling all electrode inflow areas in the OLED screen body to flow in the same current to obtain the brightness distribution of the luminous area of the OLED screen body;

step two, obtaining a screen brightness average value, a screen brightness maximum value region, a screen brightness minimum value and a screen brightness minimum value region according to the brightness distribution of the OLED screen light-emitting region;

step three, the inflow current of the corresponding electrode inflow region is adjusted nearby through the injection electrode, so that the brightness of the luminous region of the OLED screen body tends to be consistent, and the current value of each electrode inflow region is recorded;

step four, repeatedly carrying out dynamic compensation on the luminous area of the OLED screen body to obtain the optimal brightness distribution of the OLED screen body and the compensation current correction value I of each injection electrode _ij ；

And fifthly, controlling the compensation current of each injection electrode to obtain the brightness change dynamic effect of the screen body.

In the third step, the method for adjusting the brightness of the luminous area of the OLED screen body to be consistent through the injection electrode comprises the following steps: for a local luminous area higher than the screen brightness average value, controlling the inflow current of the nearest injection electrode electrically connected with the local luminous area to be reduced; and controlling the inflow current of the nearest injection electrode electrically connected with the local luminous area lower than the brightness average value of the screen body to increase.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

A. according to the method, the injection electrodes used for regulating and compensating current input are bound around the OLED screen body, so that the independent current of each injection electrode or a plurality of different injection electrodes can be controlled, the purpose of controlling the brightness distribution of the screen body is achieved, after the unbalanced screen body brightness area is found, the control of the luminous uniformity distribution of the luminous area of the OLED screen body is achieved through the current input adjustment of the injection electrodes, the problem of uneven brightness distribution of the luminous area of the OLED screen body caused by the fact that the current actual input of each local luminous area is different is solved, the method can be applied to factory detection, and brightness compensation is carried out on the screen body without TFT control.

B. The invention is suitable for OLED screen body with arbitrary plane figure, and can realize the dynamic effect control of the set figure by controlling the current of one or more injection electrodes singly or in multiple threads through the controller, and realize the controllable bright and dark dynamic change effect of the screen body without partition.

C. According to the invention, one or more electrode inflow areas can be set at the edge of the luminous area of the OLED screen body, the electrode inflow areas can be set in the luminous area of the OLED screen body, one or more injection electrodes are connected with the corresponding electrode inflow areas through a section of luminous area lead wire isolated from the luminous area of the OLED screen body, and the brightness or gray uniformity of the large-area screen body and a more complex graphical dynamic display effect can be realized through controlling the input current of the injection electrodes.

D. According to the invention, the luminous area leads are arranged at the edge positions of the OLED screen body, and the paths of edge erosion can be improved (increased) under the condition of not increasing the edge width of the screen body by adopting different luminous area lead shapes, so that the packaging performance is optimized, and the stability of the screen body is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is an equivalent circuit diagram of an OLED screen in the prior art;

FIG. 2 is a schematic diagram of an electrode design and a luminance distribution of an OLED panel according to the prior art;

FIG. 3 is a schematic cross-sectional view of an OLED panel according to embodiment 1 of the present invention;

FIG. 4 is a schematic diagram of an equivalent circuit of the injection electrode according to embodiment 1 of the present invention;

FIG. 5 is a schematic diagram of the distribution of multiple injection electrodes on the same edge of the screen according to embodiment 2 of the present invention;

fig. 6 is a schematic diagram of the structure of the electrode inflow region and the edge of the light emitting region provided in embodiment 2 of the present invention, and fig. 7 is a schematic diagram of the distribution of the plurality of injection electrodes on the plurality of edges of the screen provided in embodiment 3 of the present invention;

FIG. 8 is a schematic diagram showing the distribution of a plurality of injection electrodes on a plurality of edges of a screen according to embodiment 4 of the present invention;

FIG. 9 is a schematic diagram showing the distribution of multiple electrodes at the edge of a circular screen according to embodiment 5 of the present invention;

FIG. 10 is a schematic cross-sectional view of an OLED panel according to embodiment 6 of the present invention;

FIG. 11 is a schematic diagram showing the connection of the electrode inflow region provided in the interior of the screen according to embodiment 6 of the present invention;

fig. 12 is an enlarged view of the portion I in fig. 11;

fig. 13 is an equivalent circuit diagram of multi-electrode injection for a common cathode device structure according to embodiment 7 of the present invention;

FIG. 14 is a logic diagram for adjusting brightness of a panel according to the present invention;

FIG. 15 is a schematic view of the screen body corresponding to FIG. 13, wherein the light-emitting area is divided into 4 areas corresponding to four electrode inflow areas;

FIG. 16 is a schematic diagram showing the adjustment of the current value of each electrode inflow region to a complementary test value by an adjustable varistor according to the present invention;

FIGS. 17-1, 17-2 and 17-3 are schematic views of the brightness distribution of the screen obtained during the initial multi-electrode compensation according to embodiment 8 of the present invention;

fig. 18 is a schematic diagram of luminance dynamic distribution presented on a screen according to embodiment 4 of the present invention.

Reference numerals illustrate:

1-a screen substrate; 2-anode; 3-auxiliary electrodes; 4-an insulating layer; 5-an organic functional layer; 6-cathode; 7-packaging layer; 8-cathode electrode; 9-an anode electrode; 10-anode local inflow region; 11-light emitting region leads; 12-connecting wires; 13-OLED screen body luminous area; 14-an anode lower insulating layer; 15-opening the insulating layer.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art, and the present invention will only be defined by the appended claims. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. It will be understood that when an element such as a layer, region or substrate is referred to as being "formed on" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly formed on" or "directly disposed on" another element, there are no intervening elements present.

In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

Example 1

As shown in fig. 3, the organic electroluminescent screen provided by the present invention includes: a screen substrate 1, an anode 2, an auxiliary electrode 3, an insulating layer 4, an organic functional layer 5, a cathode 6, an encapsulation layer 7, and the like.

As shown in fig. 4, when only the electrode #1 is injected with current, the equivalent organic light emitting diode near the electrode will obtain higher current, and the light emitting brightness of the area away from the electrode #1 will decrease as the resistance increases or the resistance distribution is uneven. For this reason, the uniformity of the far-end equivalent light emitting diode can be increased by introducing the new electrode # 2.

As shown in fig. 5 to 11, the present invention provides an organic electroluminescent panel, around which one or more injection electrodes are bound, the injection electrodes being electrically connected to corresponding electrode inflow regions provided in a light emitting region 13 of the OLED panel through light emitting region leads 11 or connection lines 12 for inputting current to each partial light emitting region of the OLED panel.

The injection electrode comprises a plurality of anode electrodes 9 and cathode electrodes 8 distributed at the edges of the luminous areas of the OLED screen body, the anode electrodes 9 are respectively and electrically connected with anode local inflow areas 10 in the luminous areas 13 of the corresponding OLED screen body, and the cathode electrodes are electrically connected with cathode local inflow luminous area leads 11 in the luminous areas of the corresponding OLED screen body.

Example 2

As shown in fig. 5, the organic electroluminescent screen body with injection electrodes bound on the same edge is provided with i anode electrodes 9 and 1 cathode electrode 8 along the edge position of the light-emitting area 13 of the OLED screen body, and anode local inflow areas are distributed at the four edge positions of the light-emitting area of the screen body, so that the brightness of the light-emitting area of the screen body is more convenient to adjust; of course, the anode partial inflow region may be distributed at two or three edge positions of the screen body luminous region. The light emitting area lead 11 of the anode local inflow area can be a light emitting area lead 11 with different shapes or a whole anode or an anode and an auxiliary electrode, as shown in fig. 6, the leads with different shapes can change the resistance value of a single lead, so that the uniformity of current injected from the injection point of the injection electrode to the common electrode can be changed, and the occurrence of a lighting extremum is avoided; secondly, one mode of edge encapsulation failure of the OLED screen is to verify that the edge leads of the screen erode such as an OLED luminous area by water and oxygen, and different lead shapes can improve (increase) the path of edge erosion without increasing the edge width of the screen, so that the encapsulation performance is optimized, and the stability of the screen is improved.

Example 3

As shown in fig. 7, i anode electrodes 9 are disposed at four edge positions of the light emitting area 13 of the square OLED panel, and a mode of directly binding the anode electrodes on multiple sides of the panel and sharing one cathode electrode 8 is adopted.

Example 4

As shown in fig. 8, along a plurality of edge positions of the square OLED panel light-emitting area 13, i anode electrodes 9 and j cathode electrodes 8 are provided, the anode electrodes 9 are disposed at the upper edge and the left edge positions of the OLED panel light-emitting area 13, and the cathode electrodes 8 are sequentially disposed at the lower edge and the right edge positions of the OLED panel light-emitting area 13, and the positions of the anode electrodes 9 and the positions of the cathode electrodes 8 are disposed opposite to each other, where the number i of anode electrodes is equal to the number j of cathode electrodes. The different injection electrodes may be actual binding sites or actual current inflow sites, and the binding sites may be connected to the electrode inflow regions by connecting wires 12. The sizes of all the current inflow positions can be designed, and the width of the anode partial inflow region or the cathode partial inflow region can be more than 1 mu m and less than or equal to the edge length of the OLED screen body luminous region. The overall brightness distribution dynamic display effect of the whole non-partitioned screen in fig. 18 is realized by performing layout design according to brightness dynamic distribution requirements and controlling the current of each anode electrode 9 and cathode electrode 8 or controlling the currents of a plurality of anode electrodes 9 and cathode electrodes 8.

Example 5

The invention is applicable to OLED screen body with arbitrary planar figure, as shown in figure 9, the common cathode electrode and multiple anode electrodes are arranged at the circumference position of the circular luminous area. The OLED panel may be a top-emitting panel, a bottom-emitting panel, or a double-sided light-transmitting panel. If a bottom emission structure of a reflective cathode is used, the cathode is generally thicker and has lower resistance, and in a multi-electrode design, more anode inflow areas should be designed and controlled. In contrast, if a transparent cathode device structure is used, the resistivity of the cathode is significantly increased due to the influence of the material, and more cathode inflow areas should be designed and controlled.

Example 6

In addition to the above embodiments, the plurality of electrode inflow regions in the present invention are not limited to be set at the edges of the light emitting region, but may be set at the positions of the light emitting region. As shown in fig. 10 to 12, an anode lower insulating layer 14 is disposed between the panel substrate 1 and the anode 2, a light emitting region lead 11 is disposed under the anode lower insulating layer 14, and then the light emitting region lead 11 is conducted upward through an insulating layer opening 15, one or more of the plurality of injection electrodes may be connected to a corresponding electrode inflow region through a segment of the light emitting region lead isolated from the light emitting region of the OLED panel, and the light emitting region lead 11 is introduced into a designated region of the OLED panel for current inflow. As shown in fig. 11, at this time, the light emitting region lead extending into the OLED panel and electrically connected to the electrode inflow region inside the corresponding panel light emitting region is not coplanar with the other light emitting region leads in fig. 11, which are directly electrically connected to the electrode inflow region disposed at the edge of the panel light emitting region, so that a more complex graphic display effect can be achieved.

Example 7

As shown in fig. 13, the injection current of each led may be controlled independently or in multiple lines, in which four electrode inflow regions #1, #2, #3 and #4 are provided, and the currents of the four electrode inflow regions may be controlled by a controller (not shown in the figure) to control the current of the four leds, so as to realize current balance of the leds, thereby realizing uniformity of overall light emission of the panel and dynamic control of brightness distribution of the panel. The controller can realize brightness uniformity compensation, wherein the control logic of the controller is as shown in the logic diagram of fig. 14, and the brightness of each local area of the luminous area is controlled in the set brightness range by gradually calculating, comparing and adjusting the current of each injection electrode; the brightness change of different areas of the screen body can be realized by controlling the current of different injection electrodes in time sequence.

As shown in fig. 15, the light emitting area of the panel is divided into 4 parts corresponding to four electrode inflow areas, corresponding to the equivalent circuit fig. 13. In order to realize that the brightness uniformity of the screen meets the requirement of a threshold value, compensation adjustment of currents of inflow regions of different electrodes can be performed according to the screen brightness adjustment logic diagram of fig. 14.

Step in fig. 14 is the step size of the adjustment, which is a set value, but also needs to be set according to the circuit in the subsequent controller. Average brightness, maximum brightness L of screen _max And minimum brightness L _min The control range may be set.

The luminance Non-uniformity Non-Unif is calculated as follows:

Non-Unif＝(L _max －L _min )/(L _max +L _min )

when the calculated brightness Non-uniformity value is smaller than the set threshold value range, namely, non-Unif < unit-th (threshold value), the current value of each electrode inflow region is directly recorded, otherwise, the current of each electrode inflow region is adjusted until the set threshold value requirement is met. The adjustable resistor is the prior art, and is not described here again.

After the current values of the electrode inflow regions meeting the brightness uniformity requirement are obtained, as shown in fig. 16, the screen lighting requirement can be achieved by arranging an adjustable rheostat at each electrode inflow region, and adjusting the current values of the electrode inflow regions to the values of the supplementary test through the adjustable rheostat.

The invention can determine the distribution and quantity of the actual injection electrodes and the independent control quantity and control method according to the shape of the OLED screen body and the final brightness distribution effect.

After the screen body with the multi-electrode design is manufactured, the control on the brightness uniformity and the dynamic presentation effect of the screen body is realized by the following control method, and the method specifically comprises the following steps: initial multi-electrode compensation, dynamic electrode compensation, and brightness dynamic control.

Referring to fig. 14, the initial multi-electrode compensation method is as follows:

step 1, controlling all injection electrodes in an OLED screen body to enable an electrode inflow region to flow in the same current, so as to obtain the brightness distribution of a luminous region of the OLED screen body;

step 2, obtaining a maximum value, a region where the maximum value is located, a minimum value, a region where the minimum value is located, uniformity and average value of the brightness of the OLED screen according to the brightness distribution of the luminous region of the screen;

and 3, nearby adjusting the inflow current of the corresponding electrode inflow region through the injection electrode, enabling the brightness of the luminous region of the OLED screen body to be consistent, and recording the current value of each electrode inflow region.

One example of the adjustment method is as follows: for a local luminous area higher than the screen brightness average value, controlling the inflow current of the nearest injection electrode electrically connected with the local luminous area to be reduced; and controlling the inflow current of the nearest injection electrode electrically connected with the local luminous area lower than the brightness average value of the screen body to increase.

After repeated dynamic adjustment, the optimal brightness distribution and the corresponding current distribution of the screen design can be obtained. The control circuit or chip can write in the optimal current distribution, so that the screen body overcomes the non-uniformity in the manufacturing process to the greatest extent, and the optimal luminous effect is achieved.

And on the basis of finishing the step 3, executing the step 4 to perform dynamic electrode compensation.

Step 4, repeatedly performing dynamic compensation on the luminous area of the OLED screen body to obtain the optimal brightness distribution of the OLED screen body and the compensation current correction value I of each injection electrode _ij The method comprises the steps of carrying out a first treatment on the surface of the After the initial multi-electrode compensation, the supplementary operations from step 1 to step 3 can be performed at intervals in the use process, so that the uniformity of the screen body is continuously corrected.

After the initial multi-electrode compensation of the steps 1 to 3 is completed, an initial correction value I of each electrode inflow region is obtained _ij When in use, the current flowing into the areas of different electrodes can be controlled by means of time sequence, program control and the like, thereby obtaining a fewThe brightness change dynamic effect of different areas of the screen body can be: gradation, flow lighting, bright-dark flickering, etc.

Example 8

As shown in the following FIGS. 17-1 to 17-3, when I _{P-1_N-1} ＝I _{P-2_N-1} ＝I _{P-2_N-1} ＝I _{P-3_N-1} ＝……＝I _{P-i_N-1} At this time, the luminance distribution of FIG. 17-1 is obtained, and since the electrodes P-1 and P-2 are nearest to N-1, two bright angles having luminance far higher than the average value appear. At this time, the current adjustment is performed according to the initial multi-electrode compensation scheme described above, and fig. 17-2 can be obtained: there are small areas with brightness above or below average (such as the upper right and upper left areas in fig. 17-2). If the multi-electrode design of the screen fully considers the non-uniformity of the screen, and electrode adjustment is performed a plurality of times, the screen with high uniform brightness as shown in fig. 17-3 can be obtained.

For the rest OLED screen body luminous areas with any planar shape, the distributed design of the injection electrodes on the OLED screen body can be adopted, and the input current of each injection electrode is adjusted for a plurality of times, so that the high-uniformity display of the OLED screen body with any planar graph in the appearance is realized, and the specific multi-electrode compensation adjustment method is as above, and is not repeated here.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims

1. The organic electroluminescent screen body is characterized in that one or more injection electrodes are bound around the OLED screen body, and the injection electrodes are electrically connected with corresponding electrode inflow areas arranged in the luminous areas of the OLED screen body through luminous area leads or connecting wires and are used for inputting current to each local luminous area in the OLED screen body; the screen structure also comprises a controller electrically connected with one or more injection electrodes, the controller controls the compensation current of each injection electrode, and the brightness change dynamic effect of the non-partition screen is obtained by using a program control means.

2. The organic electroluminescent panel of claim 1, wherein the injection electrode comprises one or more anode electrodes and cathode electrodes distributed at edges of the OLED panel light-emitting region, the anode electrodes being electrically connected to the corresponding anode local inflow regions in the OLED panel light-emitting region, respectively, and the cathode electrodes being electrically connected to the corresponding cathode local inflow regions in the OLED panel light-emitting region.

3. The organic electroluminescent panel of claim 1, wherein a plurality of the injection electrodes are bound at the same edge of the light emitting region of the OLED panel, each local light emitting region in the OLED panel is led out through a light emitting region lead, each electrode inflow region is distributed at each edge of the light emitting region of the OLED panel and connected to a corresponding light emitting region lead, and each injection electrode is electrically connected to a corresponding electrode inflow region through a connecting wire.

4. The organic electroluminescent screen of claim 1, wherein the light emitting region leads are differently shaped light emitting region leads or monolithic anodes or anodes and auxiliary electrodes.

5. The organic electroluminescent panel of claim 2, wherein a plurality of the injection electrodes are distributed at a plurality of edges of the OLED panel light-emitting region and are electrically connected to corresponding electrode inflow regions disposed at the edges of the OLED panel light-emitting region, the anode electrode is disposed at least one edge of the OLED panel light-emitting region, and the cathode electrode is disposed at the remaining edges of the OLED panel light-emitting region opposite the anode electrode.

6. The organic electroluminescent panel of claim 1, wherein the width of the electrode inflow region is greater than 1 μιη and less than or equal to the edge length of the OLED panel light-emitting region; the OLED screen body is a top emission screen body, a bottom emission screen body or a double-sided light transmission screen body.

7. The organic electroluminescent panel of claim 1, wherein the OLED panel further comprises an electrode inflow region disposed within the light-emitting region, one or more of the injection electrodes being connected to a corresponding electrode inflow region by a segment of light-emitting region lead wire that is isolated from the light-emitting region of the OLED panel.

8. The organic electroluminescent screen according to claim 7, wherein an anode lower insulating layer is provided between the screen substrate and the anode, an insulating layer opening is formed in the anode lower insulating layer, and a light emitting region lead is provided under the anode lower insulating layer, and the light emitting region lead is conducted upward through the insulating layer opening to the corresponding electrode inflow region.

9. A method of preparing an organic electroluminescent screen, the method comprising:

And fifthly, controlling the compensation current of each injection electrode through a controller electrically connected with the injection electrode, and simultaneously controlling the current of different electrode inflow areas by using a program control means to obtain the brightness change dynamic effect of the partition-free screen body.