Display Device Transistor Pixel Electrode Capacitor Integration
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Solution Overview
Problem
Current display devices face challenges in achieving high display quality while reducing production costs, particularly in the mass production of light-emitting diode (LED) display devices.
Innovation Solution
The proposed solution involves a display device configuration that includes a substrate with a light-emitting element and a transistor, where the transistor is electrically connected to the light-emitting element, and a capacitor is formed using a pixel electrode and a conductive connection portion in the transistor layer to enhance display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device uses conventional LED structures with separate capacitor components, then the device reliability is improved through proper charge storage, but the device complexity and production cost increase due to additional manufacturing steps and layer structures
Solution Approach 1:
The patent combines the capacitor function with the transistor structure by forming the capacitor using the pixel electrode and the conductive connection portion (source or drain electrode) of the transistor. This integration eliminates the need for separate capacitor components and reduces manufacturing complexity while maintaining the charge storage function necessary for display quality
Solution Approach 2:
The conductive connection portion of the transistor serves dual functions: as an electrical connector for the light-emitting element and as one electrode of the capacitor. This multi-functionality reduces the number of components needed and simplifies the overall device structure, thereby reducing production costs while maintaining reliability
2Ease of manufacture
If the display device integrates more functions into fewer components, then the production cost is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent forms the capacitor electrode pattern and the transistor electrode pattern in separate but coordinated manufacturing steps. The capacitor electrode is formed first, then the transistor electrodes are formed with precise alignment to overlap with the capacitor electrode, allowing for controlled integration that manages manufacturing precision requirements
3Area of stationary object
If the light-emitting element and transistor are positioned close together, then the device area is reduced, but the electrical connection complexity increases
Solution Approach 1:
The patent merges the capacitor structure with the transistor-electrode connection by using the transistor's conductive connection portion as one of the capacitor electrodes. This integration simplifies the electrical connection structure while allowing the light-emitting element to be positioned close to the transistor, thereby reducing the overall device area
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 display quality and potentially reduces production costs by optimizing the electrical connections and layer structures within the display device.
Implementation Method 1
Light-emitting diodes (LEDs) generate electromagnetic radiation (for example, light) by applying the recombination of an electron-hole pair in a p-n junction
Data Source
AI summary
A display device includes a substrate, a light-emitting element, and a transistor. The substrate has a top surface. The light-emitting element is disposed on the substrate, and includes a first electrode and a second electrode. The transistor is disposed on the substrate and electrically connected to the light-emitting element. The transistor includes a gate electrode and a semiconductor layer. The semiconductor layer includes an overlapping portion overlapped with the gate electrode. The first electrode and the second electrode of the light-emitting element do not overlap with the overlapping portion along a direction perpendicular to the top surface of the substrate.