Bottom-Emission Display Gate Electrode for Integrated Touch Sensing
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Solution Overview
Problem
The manufacturing process of light emitting display apparatuses is complicated when a touch panel is attached to a light emitting display panel, and forming a touch panel using a cathode in a bottom light emitting method is difficult.
Innovation Solution
A light emitting display apparatus is designed with a gate node electrode connected to the gate of a driving transistor used as a touch electrode, configured as a bottom emission type, and includes a first gate node electrode disposed in the rear surface of a substrate, a first source node electrode on the same layer as the gate electrode, and a first switching transistor connected to a gate line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is attached to a light emitting display panel, then touch functionality is achieved, but the manufacturing process becomes complicated
Solution Approach 1:
The patent merges the touch electrode function with the gate node electrode that is already part of the light emitting display panel structure. The gate node electrode, which connects to the gate of the driving transistor, is configured to serve dual purposes: electrical connection for transistor operation and touch sensing. This integration eliminates the need for a separate touch panel attachment, thereby achieving touch functionality while simplifying the manufacturing process.
Solution Approach 2:
The gate node electrode is designed to perform multiple functions simultaneously. It serves as both the electrical connection element for the driving transistor gate and the touch sensing electrode. This multi-functionality allows the display panel to achieve touch capability without requiring additional dedicated touch panel components, thus resolving the contradiction between achieving versatility and maintaining manufacturing simplicity.
2Adaptability or versatility
If a touch panel is formed using a cathode in a bottom light emitting method, then touch functionality is integrated, but it is difficult to form the touch panel
Solution Approach 1:
The patent extracts the touch electrode function from the cathode structure and assigns it to the gate node electrode instead. In bottom light emitting display panels, the cathode is already configured for light emission purposes. By taking out the touch functionality requirement from the cathode and implementing it through the gate node electrode, the patent avoids the difficulty of forming a touch panel using the cathode while still achieving integrated touch capability.
Solution Approach 2:
The gate node electrode acts as an intermediary element that bridges the gap between the driving transistor electrical connection requirement and the touch sensing requirement. Instead of trying to make the cathode serve dual purposes (which is difficult in bottom emission), the gate node electrode mediates both functions, making touch panel formation feasible and simplifying the manufacturing process.
Data Source
AI summary
A light emitting display apparatus includes a first node electrode disposed in a rear surface of a substrate and connected to a gate of a first driving transistor of a first pixel, an first source electrode disposed on the same layer as a gate of the first driving transistor, overlapping the first gate electrode, and connected to a first electrode of a first light emitting device, a first switching transistor connected to a first gate line, and a first sensing transistor connected to a gate of the first switching transistor, wherein the first gate electrode is disposed between the rear surface of the substrate and the first source electrode.