Organic Light-Emitting Device Reflective Layer Peripheral Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic light-emitting devices face issues with broken electrodes in the peripheral circuit area, leading to voltage drop and reduced light-emitting area, which restricts display resolution and shrinkage due to the need for auxiliary electrodes that occupy valuable pixel space.
Innovation Solution
The implementation of a reflective layer in the peripheral circuit area, electrically connected to the electrode, eliminates the need for an additional auxiliary electrode by using a reflective layer with a first part in the pixel area and a second part in the peripheral circuit area, allowing the second electrode layer to extend and contact the reflective layer, thereby preventing electrode damage and maintaining the light-emitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cathode layer is extended to contact the signal layer in the peripheral circuit area to inhibit voltage drop, then the voltage stability is improved, but the cathode layer is prone to damage (broken) because the aspect ratio of the contact hole is too high and the cathode layer is too thin
Solution Approach 1:
The invention divides the cathode layer into two functional parts: a thin cathode layer in the pixel area for light emission, and a separate auxiliary electrode in the peripheral circuit area for electrical connection. This segmentation allows each part to be optimized independently - the thin cathode layer maintains good light emission properties while the auxiliary electrode provides robust electrical connection without being damaged by high aspect ratio contact holes.
Solution Approach 2:
The auxiliary electrode acts as an intermediary between the cathode layer and the signal layer. Instead of directly extending the thin cathode layer to contact the signal layer (which causes breakage), the auxiliary electrode serves as a mediator that provides a stable electrical connection path, relieving the stress on the thin cathode layer.
2Reliability
If an auxiliary electrode is employed between pixels in the pixel area to inhibit voltage drop, then the voltage stability is improved, but the available light-emitting area is decreased because every pixel needs to sacrifice certain areas to serve as contact regions
Solution Approach 1:
The invention segments the device into distinct functional areas: the pixel area dedicated entirely to light emission and the peripheral circuit area for electrical connections. By placing the auxiliary electrode in the peripheral circuit area rather than within the pixel area, the light-emitting area is maximized while voltage stability is maintained through the auxiliary electrode's connection function.
Solution Approach 2:
The invention resolves the area conflict by transitioning from a two-dimensional planar layout to a three-dimensional layered structure. The auxiliary electrode is positioned in a different spatial layer and location (peripheral circuit area) rather than competing for the same two-dimensional pixel area, thereby eliminating the trade-off between connection area and light-emitting area.
3Ease of manufacture
If the display resolution and shrinkage are restricted due to the need for contact regions, then the manufacturing complexity is reduced, but the productivity and device miniaturization are limited
Solution Approach 1:
By segmenting the device into pixel area and peripheral circuit area with distinct functions, the invention enables independent optimization of each region. The pixel area can be minimized for high resolution and small form factor, while the peripheral circuit area accommodates the auxiliary electrode and connection structures, allowing display shrinkage without compromising manufacturing simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution prevents electrode breakage, maintains the light-emitting area, and allows for the shrinkage of display panels without sacrificing image quality, as the reflective layer ensures stable electrical connections and efficient light emission.
Implementation Method 1
the reflective layer 220...configured to reflect the light emitted from the organic light-emitting layer 250
Data Source
AI summary
An organic light-emitting device and methods of forming the same are provided. The organic light-emitting device includes: a substrate having a pixel area and a peripheral circuit area; a reflective layer on the substrate, the reflective layer having a first reflective part in the pixel area and a second reflective part in the peripheral circuit area; a first electrode layer having a first part on the first reflective part; a pixel definition layer on the substrate, the pixel definition layer forming a plurality of pixel openings to expose a portion of the first part of the first electrode layer and at least one electrode contact hole to expose the second reflective part; an organic light-emitting layer on the first electrode layer; and a second electrode layer on the organic light-emitting layer, the second electrode layer extending to the peripheral circuit area to electrically couple with the exposed area of the second reflective part.