OLED Display Panel with Integrated Control Electrode and Capacitor
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Solution Overview
Problem
Existing display panels face challenges in achieving improved electrical and display characteristics, particularly in the design of pixel driving circuits and capacitors, which affect the efficiency and stability of light emission in organic light-emitting diodes (OLEDs).
Innovation Solution
The display panel incorporates a novel structure with a first transistor containing an oxide semiconductor pattern, a capacitor with electrodes on different layers, and additional control electrodes that form a single body, along with a light-emitting element connected to the capacitor and transistor, optimizing the overlap and layering of electrodes to enhance capacitance and control voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional pixel driving circuit with separate control electrodes and capacitor electrodes is used, then the manufacturing process requires multiple additional processing steps, but the electrical characteristics and integration density are limited
Solution Approach 1:
The patent merges the additional control electrode with the capacitor's second electrode into a single conductive layer, forming a single body structure. This integration eliminates the need for separate processing steps for these electrodes while achieving dual functionality: the electrode serves both as a control electrode for the transistor and as an electrode for the capacitor, thereby improving electrical characteristics and integration density without complicating the manufacturing process
2Ease of manufacture
If the capacitor electrodes are placed on the same layer, then the manufacturing process is simplified, but the capacitance and voltage control capability are reduced
Solution Approach 1:
The patent positions the capacitor's first electrode on a different layer from the second electrode, creating a multi-layer capacitor structure. The first electrode is disposed on a layer different from the layer containing the second electrode, which allows for increased capacitance and improved voltage control capability while still maintaining manufacturing efficiency through the integrated control electrode design
3Reliability
If additional control electrodes are added to improve transistor control, then the electrical characteristics are enhanced, but the device complexity and processing steps increase
Solution Approach 1:
The patent designs the second electrode of the capacitor to also function as an additional control electrode for the first transistor. This multi-functional electrode overlaps with both the first control electrode and the first semiconductor pattern, providing enhanced transistor control and voltage regulation while avoiding the need for completely separate additional control electrode structures
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 configuration improves the electrical characteristics and integration density of the display panel, allowing for more stable light emission and simplified manufacturing processes by reducing the need for additional processing steps and increasing the capacitance, thus enhancing overall display performance.
Implementation Method 1
a first transistor that includes a first semiconductor pattern that contains oxide
Implementation Method 2
a capacitor that includes a first electrode coupled to the first control electrode and a second electrode disposed on a different layer from the first electrode
Data Source
AI summary
A display panel includes a first transistor that contains oxide, a capacitor that includes a first electrode and a second electrode, a light emitting element connected to the capacitor and the first transistor, and an additional control electrode connected to the second electrode. The first and second electrodes are disposed on different layers from each other and are coupled to a first control electrode and a first output electrode, respectively, of the first transistor, and the light emitting element includes a light emitting layer. The additional control electrode overlap the first control electrode and the first semiconductor pattern, when viewed in a plan view. The additional control electrode and the second electrode are disposed on the same layer and form a single body.