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Organic light-emitting diode display screen employing transparent electrodes and preparation method thereof

A technology of light-emitting diodes and transparent electrodes, which is applied to circuits, electrical components, and electrical solid devices, can solve problems such as high energy consumption, failure to work with voltage drop, and failure to use inkjet printing methods for common electrodes, so as to improve display brightness and shorten The effect of power supply distance

Pending Publication Date: 2017-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Disadvantages of the current OLED display structure and preparation process: Vacuum evaporation is a time-consuming, high energy consumption, and high material loss process, which should be avoided as much as possible.
Although the organic functional layer in step (2) can be prepared by inkjet printing method, the common electrode in step (3) still cannot be prepared by inkjet printing method, and can only be prepared by vacuum evaporation
The reason is that the conductivity of the electrode material suitable for inkjet printing is very low, and when Vcom is introduced from outside the display area, the voltage drop is too large to work

Method used

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  • Organic light-emitting diode display screen employing transparent electrodes and preparation method thereof
  • Organic light-emitting diode display screen employing transparent electrodes and preparation method thereof
  • Organic light-emitting diode display screen employing transparent electrodes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) On the basis of the traditional display substrate, on the pixel definition layer (PDL layer) in the display area, a layer of exposed Vcom wiring along the direction of the Data line is added by photolithography (Mo / Al / Mo sandwich structure) , with a thickness of about 1um and a width of about 5um. The cross-sectional structure schematic diagram of the obtained pixel substrate is shown in Fig. 4(a). The Vcom line is connected to the Vcom input terminal outside the display area.

[0033] (2) Solution processing each organic functional layer on the substrate of step (1):

[0034] 1) Hole injection layer: inkjet printing PEDOT:PSS (its chemical structure is as follows Figure 5 shown) about 40nm thick;

[0035] 2) Hole transport layer: spin-coated PVK about 40nm thick;

[0036] 3) Light-emitting layer: spin-coated MEH-PPV about 70nm thick (orange light), or inkjet printed CdS quantum dots about 60nm thick (red light);

[0037] 4) Electron transport layer: Inkjet pr...

Embodiment 2

[0045](1) On the basis of the traditional display substrate, on the pixel definition layer (PDL layer) in the display area, an inkjet process is used to add a layer of exposed Vcom traces (Ag nanoparticles) along the direction of the Gate line, with a thickness of about 1um , a width of about 10um. The cross-sectional structure schematic diagram and the top view structural schematic diagram of the obtained pixel substrate are shown in FIG. 4( b ) and FIG. 4( c ), respectively. The Vcom line is connected to the Vcom input terminal outside the display area.

[0046] (2) Solution processing each organic functional layer on the substrate of step (1):

[0047] 1) Hole injection layer: inkjet printing PEDOT:PSS about 40nm thick;

[0048] 2) Hole transport layer: spin-coated PVK about 40nm thick;

[0049] 3) Light-emitting layer: spin-coated MEH-PPV about 70nm thick (orange light), or inkjet printed CdS quantum dots about 60nm thick (red light);

[0050] 4) Electron transport lay...

Embodiment 3

[0057] (1) On the basis of the traditional display substrate, on the pixel definition layer (PDL layer) in the display area, a layer of exposed Vcom wiring along the direction of the Data line is added by photolithography (Mo / Al / Mo sandwich structure) , with a thickness of about 1um and a width of about 5um. The Vcom line is connected to the Vcom input terminal outside the display area.

[0058] (2) Solution processing each organic functional layer on the substrate of step (1):

[0059] 1) Hole injection layer: inkjet printing PEDOT:PSS about 40nm thick;

[0060] 2) Hole transport layer: spin-coated PVK about 40nm thick;

[0061] 3) Light-emitting layer: spin-coated MEH-PPV about 70nm thick (orange light), or inkjet printed CdS quantum dots about 60nm thick (red light);

[0062] 4) Electron transport layer: Inkjet printing ZnO nanoparticles about 30nm thick;

[0063] 5) Electron injection layer: spin-coated Cs 2 CO 3 The nanoparticles are about 20nm thick;

[0064] (3) ...

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Abstract

The invention belongs to the technical field of OLED display screens, and discloses an organic light-emitting diode (OLED) display screen employing transparent electrodes and a preparation method thereof. The OLED display screen employing a pixel structure which is so structured to add a Vcom wire near each pixel along Data line or Gate line direction, and communicate with Vcom input ends outside a display area. Each pixel comprises, sequentially from bottom to top, a TFT circuit region, an ITO pixel electrode, an organic functional layer and a transparent common electrode, the transparent common electrode in each pixel communicates with the Vcom wire near the pixel, and transparent common electrodes in different pixels communicate or do not communicate with each other. Common electrodes employ transparent materials and preserved bare Vcom wires are designed on a display screen substrate, thereby greatly increasing the display brightness and greatly shortening the power supply distance. The defects of low conductivity of solution processed electrode materials can be overcome.

Description

technical field [0001] The invention belongs to the technical field of OLED display screens, and in particular relates to an organic light-emitting diode display screen using transparent electrodes and a preparation method thereof. Background technique [0002] Organic Light Emitting Diode (OLED) display is an important new display technology. The existing common OLED display is mainly composed of device bias (Vdd) input terminal, data line (Data line) input terminal array, common electrode (Vcom) input terminal, gate line (Gate line) input terminal array and display area (pixel District) composition, the overall structure diagram is as follows figure 1 As shown, the display area is generally composed of a pixel substrate and an organic functional layer on the substrate and a common electrode. The pixel substrate generally includes glass and a pixel definition layer (PDL) on the glass. Each pixel area of ​​the pixel definition layer is sequentially The TFT circuit area and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/32
CPCH10K59/121H10K59/1213H10K59/131
Inventor 彭俊彪王坚郑华郑奕娜许伟宋晨胡展豪王剑斌王娟红江从彪
Owner SOUTH CHINA UNIV OF TECH
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