ESD Protection Circuit Integrated in Pixel Circuits for Bezel-less Displays
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Solution Overview
Problem
Conventional display panels face challenges in achieving a bezel-less design due to the presence of electro-static discharge (ESD) protection circuits, which obstruct miniaturization and visibility when multiple display modules are tiled, as these circuits are typically located in the bezel area and their removal can lead to static electricity issues and short circuits.
Innovation Solution
Incorporating an ESD protection circuit within the pixel circuits themselves, specifically using thin film transistors (TFTs) to bypass static electricity or equalize potentials between scan, data, power, and ground lines, allowing for ESD protection without the need for a bezel area, by arranging the ESD protection circuit in a unit of pixel circuits or at the edge of the display module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ESD protection circuit is disposed in bezel area, then pixel circuit is protected from static electricity, but bezel area blocks miniaturization and deteriorates visibility when multiple display modules are tiled
Solution Approach 1:
The ESD protection circuit is merged with the pixel circuit by integrating it into the same thin film transistor layer. The ESD protection circuit shares the same substrate and manufacturing process as the pixel circuit, eliminating the need for a separate bezel area while maintaining protection functionality.
Solution Approach 2:
The ESD protection circuit is arranged in a different spatial dimension within the pixel circuit area. Instead of placing it in the bezel area (peripheral dimension), it is integrated into the active pixel circuit region, utilizing the same layer structure and manufacturing process to achieve protection without occupying additional visible area.
2Area of stationary object
If ESD protection circuit is removed to achieve bezel-less design, then visibility and miniaturization are improved, but static electricity causes damage to pixel circuit
Solution Approach 1:
The ESD protection circuit is designed to activate automatically when static electricity is detected on the data line or power supply line. The thin film transistors in the ESD protection circuit respond to voltage changes and redirect static electricity to the ground line before it can damage the pixel circuit components.
Solution Approach 2:
The ESD protection circuit acts as an intermediary between the external signal lines (data line, power supply line) and the sensitive pixel circuit components. It provides a controlled path for static electricity discharge through ground connection, protecting the pixel circuit from direct exposure to electrostatic discharge.
3Area of stationary object
If ESD protection circuit is integrated into pixel circuit, then bezel-less design is achieved, but device complexity increases
Solution Approach 1:
The ESD protection circuit utilizes the same manufacturing parameters and material layers as the pixel circuit. Both circuits are formed using identical thin film transistor fabrication processes, including the same semiconductor layer, gate electrode, and contact hole structures, thereby minimizing additional complexity.
Solution Approach 2:
The thin film transistor layer serves dual functions: it forms both the pixel circuit elements (switches, capacitors) and the ESD protection circuit elements. The same manufacturing process and material layers are used for both circuits, making the ESD protection functionality universal within the existing pixel circuit architecture.
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 approach enables the creation of a bezel-less display panel that effectively protects against ESD while maintaining seamless integration of multiple display modules without compromising visibility or stability.
Implementation Method 1
an ESD protection circuit arranged in at least one of the plurality of pixel circuits... ESD protection circuit of first type including two thin film transistors (TFTs) for bypassing static electricity flowing through the data line or the power supply line to the ground line
Implementation Method 2
ESD protection circuit of second type including a transistor that allows the scan line, the data line, the power supply line, and the ground line to have equal potentials by a capacitive coupling effect
Data Source
AI summary
A display module including a plurality of pixels is provided. The display module according to an embodiment includes a plurality of inorganic light emitting elements constituting the plurality of pixels, a plurality of pixel circuits provided for each of the plurality of inorganic light emitting elements and providing a driving current corresponding to an applied grayscale data voltage to each of the plurality of inorganic light emitting elements, and an ESD (Electro Static Discharge) protection circuit arranged in at least one of the plurality of pixel circuits.