CN202332855U - Display panel of display device - Google Patents

Abstract

The utility model provides a display panel of a display device, comprising a light-emitting area, a plurality of cathodes and a cathode lead group connected with a plurality of cathodes, as well as a plurality of anodes and an anode lead group connected with a plurality of anodes, wherein a plurality of anode leads in the anode lead group are unequal in length and equal in width; auxiliary electrodes are partially disposed on the anode leads in the anode lead group; and the lead parts without auxiliary electrodes are equal in length. The uniformity of resistances can be easier to realize by partially covering auxiliary electrodes on leads, utilizing the low resistances of auxiliary electrodes and controlling the lengths of auxiliary electrodes, thus ensuring to achieve the consistency of each pixel current.

Description

A display panel of a display device

technical field

The utility model relates to a display panel of a display device, in particular to a display panel of an organic light-emitting display device.

Background technique

The principle of organic electroluminescence refers to the use of organic materials as the light-emitting layer, with a cathode layer and an anode layer on both sides of the light-emitting layer, and a current is passed between the two electrodes. When the current passes through the light-emitting layer, the organic material in the light-emitting layer will emit light. According to this principle, an organic electroluminescent device (Organic Light Emitting Diode, hereinafter referred to as OLED) was developed. Compared with the traditional liquid crystal display, OLED display has the advantages of thin body, simple preparation process, fully cured luminescent material, and flexible device, which has attracted widespread attention. More and more OLEDs are used in the fields of display and lighting.

In addition to the anode layer, the light-emitting layer, and the cathode layer, the existing OLED device also includes an insulating layer and a spacer layer. The insulating layer and the spacer layer divide the light-emitting layer into small light-emitting points, and multiple light-emitting points at different positions Click the required light to get the pattern that needs to be displayed. The area with light-emitting points on the OLED is the light-emitting area, and the cathode and anode of the light-emitting area are connected to the integrated circuit through leads, and the integrated circuit controls the light-emitting point to emit light.

Figure 1 is a schematic diagram of the structure of the existing OLED screen, where 1' is the substrate, which includes: a display area A composed of an array of light-emitting points, the cathode is arranged along the row direction, and the anode is arranged along the column direction; the lead areas B1 and B2, respectively corresponding to the odd-numbered and even-numbered cathodes connected to the display area; the lower lead area D connected to the anode of the display area; the lead areas B1 and B2 on both sides, and the lower lead area D are all integrated into the IC (integrated circuit ) area C.

The leads D, B1, and B2 are composed of two layers, one layer is ITO, and the resistance of ITO is relatively large, so it is necessary to cover a layer of auxiliary conductive material MoAlMo (molybdenum aluminum molybdenum) on the ITO. The anode lead of part D of the lead is in an inverted triangle shape, and the length of the anode lead gradually increases from the middle to both sides, and the resistance value is also increasing. In the prior art, the ITO is completely covered with MoAlMo, and the resistance value is controlled by changing the width of the lead. The uniformity of the resistance value can only be adjusted to a certain extent, but the uniformity is not good. Moreover, the part of the lead wire is a non-display area, and the widening of the lead wire will increase the area of the OLED screen.

Therefore, it is necessary to provide a display panel of a display device to solve the above problems.

Utility model content

The utility model provides a display panel of a display device with better uniformity under the condition of keeping the lead wire width unchanged.

The specific technical scheme is as follows:

A display panel of a display device, which includes a light-emitting area, a plurality of cathodes and a cathode lead group connected to the plurality of cathodes, a plurality of anodes and an anode lead group connected to the plurality of anodes, and the anode lead group The lengths of several anode leads are not equal and the widths are equal. In the anode lead group, auxiliary electrodes are provided on the upper part of the anode leads, and the lengths of the lead parts without auxiliary electrodes are equal.

Further, the length of each anode lead in the anode lead group is equal to the sum of the lead length of the portion of the anode lead without auxiliary electrodes and the lead length of the portion with auxiliary electrodes.

Further, the resistance value of each anode lead in the anode lead group is equal to the sum of the lead resistance of the anode lead without auxiliary electrodes and the auxiliary electrode resistance of the part with auxiliary electrodes.

Further, the length of the auxiliary electrode on the shorter lead in the anode lead group is shorter than the length of the auxiliary electrode on the longer lead.

Further, the length of the anode leads in the anode lead group gradually increases from the middle to both sides.

Further, the shortest anode lead in the anode lead group is located in the middle of the anode lead group, and no auxiliary electrode is arranged on the shortest anode lead. The longest anode lead in the anode lead group is located on both sides of the anode lead group, the auxiliary electrode on which the auxiliary electrode is set is the longest, and the length of the auxiliary electrode on the anode lead in the middle portion gradually increases from the middle to both sides.

Further, the part of the anode lead on the anode lead group with the auxiliary electrode and the part without the auxiliary electrode are not on the same straight line.

Further, the area where the auxiliary electrodes are arranged on the anode lead group is triangular.

Further, the shape of the area without auxiliary electrodes is roughly umbrella-shaped.

Further, the material of the cathode lead group and the anode lead group is ITO (indium tin oxide) or IZO (indium zinc oxide).

Further, the material of the auxiliary electrode is MoAlMo (molybdenum aluminum molybdenum).

Further, the display device is OLED.

The beneficial effect of the utility model is that the uniformity of the resistance value can be realized more easily by utilizing the low resistance value of the auxiliary electrode and controlling the length of the auxiliary electrode, so as to ensure the consistency of the current of each pixel point.

Description of drawings

Figure 1 is a schematic diagram of the existing OLED screen structure.

FIG. 2 is a schematic diagram of the wiring of the lead wires without auxiliary electrodes in the display panel of the present invention.

FIG. 3 is a schematic diagram of wiring of auxiliary electrodes on the anode lead set of the display panel of the present invention.

Among them: 1' is the substrate, A is the display area, B1 and B2 are the lead areas on both sides, D is the lower lead area, and C is the IC area;

1 is the light-emitting area, 2 is the cathode group, 3 is the anode group, 4 is the cathode lead group, 5 is the anode lead group, 6 is the area where the auxiliary electrode is set on the anode lead group, and 7 is the area where the auxiliary electrode is not set on the anode lead group area.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to FIG. 2, it is a schematic diagram of the lead wiring of the display panel 100 of the display device of the present invention without auxiliary electrodes. The display panel 100 can be used in an OLED display device, which includes a light emitting area 1, a plurality of cathodes 2 and a plurality of cathodes 2 A connected cathode lead set 4 , a plurality of anodes 3 and an anode lead set 5 connected to the plurality of anodes 3 . Several anode leads in the anode lead group 5 have different lengths and the same width, auxiliary electrodes are provided on the anode leads in the anode lead group 5, and the lengths of the lead parts without auxiliary electrodes are equal. The material of the cathode lead group 4 and the anode lead group 5 can be ITO (indium tin oxide) or IZO (indium zinc oxide), and the material of the auxiliary electrode can be MoAlMo (molybdenum aluminum molybdenum). Taking ITO as an example for the anode, the impedance of ITO ≤ 15Ω/□, MoAlMo impedance ≤0.1Ω/□, the square represents the square resistance, covering the part of the auxiliary electrode, the resistance is the parallel resistance of this part of ITO and MOALMO, which is approximately equal to the resistance of this part of MOALMO, and the length of the auxiliary electrode is different. etc., so that the resistances of different length leads are the same or similar.

Referring to FIG. 3 , it is a schematic diagram of wiring of the auxiliary electrodes on the anode lead group 5 of the display panel 100 of the display device of the present invention (in order to clearly show the pattern of the auxiliary electrodes, the anode leads are hidden). For the anode lead group 5, the widths of several anode leads are equal, but the lengths are not equal, and the length of each anode lead in the anode lead group 5 is equal to the sum of the length of the lead wires on the anode lead without auxiliary electrodes and the length of the lead wires with auxiliary electrodes. The resistance value of each anode lead wire in the anode lead wire group 5 is equal to the sum of the resistance value of the lead wire resistance value of the part without auxiliary electrodes on the anode lead wire and the resistance value of the auxiliary electrode part with auxiliary electrodes, that is, the total resistance value of a certain anode lead wire = no auxiliary electrode set Part of the lead wire resistance + setting the auxiliary electrode resistance of the auxiliary electrode part, taking the anode using ITO and the auxiliary electrode using MOALMO as an example, the total value of the lead wire resistance of an anode = the ITO resistance value of the part without auxiliary electrodes + the MOALMO resistance value of the auxiliary electrode part.

Among them, the lead wire in the middle is the shortest, and the length of the lead wire from the middle to both sides becomes longer and longer, so the resistance value of the lead wire becomes larger and larger from the middle to both sides, and auxiliary electrodes of different lengths are set on the lead wires. The resistivity is less than the resistivity of the lead wires, which can make all the lead wire resistances in the anode lead group 5 the same or similar, and the length of the auxiliary electrode on the anode lead group 5 gradually increases from the middle to both sides, preferably, the middle of the anode lead group 5 The auxiliary electrode is not covered on the shortest lead at the position, and the resistance of all the leads in the anode lead group 5 after covering the auxiliary electrode is the same or similar to the resistance of the shortest lead. The part of the anode lead on the anode lead group 5 with the auxiliary electrode and the part without the auxiliary electrode are not on the same straight line. In this embodiment, since the auxiliary electrode is not covered on the shortest lead, the area 6 on which the auxiliary electrode is set on the anode lead group 5 is a triangle. In this embodiment, there are two left-right symmetrical ones, but this area is not limited to a triangle, and can also be Other symmetrically arranged regular patterns; while the shape of the area 7 without auxiliary electrodes is roughly umbrella-shaped (see the ellipse in FIG. 3 ), it can also be set as other regular patterns.

As shown in Figure 3, as an example, a, b, and c are the parts of the three anode leads that do not cover the auxiliary electrode. The lengths of a, b, and c are equal. Since the leads of a, b, and c have the same material and the same width, a, b The resistance values of c and c are equal, and the resistance of the part covering the auxiliary electrode is much smaller than the resistance of the part not covering the auxiliary electrode. It can be approximately considered that the resistance of the part covering the auxiliary electrode is 0, so the currents of a, b and c are roughly the same.

Similarly, for the cathode lead group 4, the widths of several cathode leads are equal, but the lengths are not equal, and the leads in the cathode lead group 4 are getting shorter and shorter from top to bottom along the side of the light-emitting area 1, so the upper lead resistance is greater than For the resistance of the lower lead wires, auxiliary electrodes of different lengths are arranged on the lead wires. The resistivity of the auxiliary electrodes is smaller than the resistivity of the lead wires, so that the resistance of all the lead wires in the cathode lead group 4 is the same or similar, and the auxiliary electrodes on the cathode lead group 4 are along the The sides of the light-emitting area 1 gradually decrease from top to bottom. Preferably, no auxiliary electrode is arranged on the shortest lead in the cathode lead group 4, and the resistance of all the leads in the cathode lead group 4 after covering the auxiliary electrode is the same as that of the shortest lead. same or similar resistance.

In the production of the above-mentioned display panel, the substrate used is usually glass, and a layer of transparent electrode is sputtered on one side surface, such as ITO or IZO electrode, and then a layer of auxiliary electrode is sputtered, such as MoAlMo, etc., according to the width of the selected lead and length, as well as the resistance of electrodes and auxiliary electrodes, etc., according to the calculation method of conventional lead resistance, calculate the required coverage on each lead with equal width and different length in order to make the resistance of the anode lead or cathode lead the same or similar. The length of the auxiliary electrode, according to the above data, make the mask plate required for the auxiliary electrode, and photoetch the pattern required for the auxiliary electrode through the mask plate, and then make the mask plate required for the transparent electrode, and photoetch the transparent electrode through the mask plate. Electrode graphics, complete the electrode lead production. By partially covering the auxiliary electrode on the lead, the uniformity of the resistance can be more easily achieved by utilizing the low resistance of the auxiliary electrode and controlling the length of the auxiliary electrode, thereby ensuring the consistency of the current of each pixel.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present utility model shall include Within the protection scope of the utility model.

Claims (12)

1. A display panel of a display device, comprising a light-emitting area, a plurality of cathodes and a cathode lead group connected to the plurality of cathodes, a plurality of anodes and an anode lead group connected to the plurality of anodes, the anode The several anode leads in the lead group have different lengths and the same width, and are characterized in that auxiliary electrodes are provided on the anode leads in the anode lead group, and the lengths of the lead parts without auxiliary electrodes are equal. 2 . The display panel of a display device according to claim 1 , wherein the length of each anode lead in the anode lead group is equal to the sum of the lead lengths of the portion of the anode lead without auxiliary electrodes and the length of the portion of the anode lead with auxiliary electrodes. 3. The display panel of a display device according to claim 1, wherein the resistance value of each anode lead wire in the anode lead wire group is equal to the resistance value of the lead wire resistance of the part where no auxiliary electrode is provided on the anode lead wire and the resistance value of the lead wire resistance of the part where the auxiliary electrode is provided. The sum of the resistance values of the electrodes. 4 . The display panel of a display device according to claim 1 , wherein the length of the auxiliary electrode on the shorter lead in the anode lead group is shorter than the length of the auxiliary electrode on the longer lead. 5 . The display panel of a display device according to claim 1 , wherein the length of the anode leads in the anode lead group gradually increases from the middle to both sides. 6. The display panel of a display device according to claim 5, wherein the shortest anode lead in the anode lead group is located in the middle of the anode lead group, and no auxiliary electrode is arranged on the shortest anode lead; The longest anode lead is located on both sides of the anode lead group, the auxiliary electrode on which the auxiliary electrode is arranged is the longest, and the length of the auxiliary electrode on the middle part of the anode lead gradually increases from the middle to both sides. 7 . The display panel of a display device according to claim 6 , wherein the anode lead on the anode lead group is not provided with auxiliary electrodes and is not on the same straight line. 8 . 8. The display panel of a display device according to any one of claims 2 to 7, wherein the area where the auxiliary electrodes are arranged on the anode lead group is triangular. 9. The display panel of a display device according to any one of claims 1 to 7, wherein the shape of the area without auxiliary electrodes is umbrella-shaped. 10 . The display panel of a display device according to claim 1 , wherein the materials of the cathode lead group and the anode lead group are indium tin oxide (ITO) or indium zinc oxide (IZO). 11 . 11 . The display panel of a display device according to claim 1 , wherein the material of the auxiliary electrode is molybdenum aluminum molybdenum MoAlMo. 12. The display panel of a display device according to claim 1, wherein the display device is an OLED.

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