Micro Display Panel Edge Bending to Protect Insulation Layers
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Solution Overview
Problem
In top-emitting flexible mini/micro-LED splicing technology, the bending process often damages the insulation layer due to the rough cut glass cross-section and fan-out region, leading to potential spikes and insulation layer damage.
Innovation Solution
A micro display panel design featuring a glass substrate with an insulation layer, a thin film transistor layer, and a micro light-emitting diode layer, where the terminal of the insulation layer, thin film transistor layer, and micro light-emitting diode layer are bent away from the second surface, creating an interval between the insulation layer terminal and the first terminal, preventing squeezing during splicing and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fan-out region is bent to a glass side during splicing, then the spliced display panel can be assembled, but the insulation layer is damaged due to rough cut glass cross-section
Solution Approach 1:
The patent applies preliminary action by pre-forming a protective coating layer on the insulation layer before the bending process. This coating layer is applied in advance to protect the insulation layer from damage during subsequent bending and splicing operations, preventing the harm before it occurs.
Solution Approach 2:
The protective coating layer acts as a cushioning layer that absorbs and distributes the stress during bending. This beforehand cushioning prevents the concentration of stress at the rough cut glass cross-section, thereby protecting the insulation layer from damage during the splicing process.
2Reliability
If the insulation layer is protected during bending, then the reliability is improved, but the device structure becomes more complex
Solution Approach 1:
The protective coating layer serves multiple functions: it protects the insulation layer from damage during bending, provides a smooth surface for subsequent processing, and maintains structural integrity during splicing. By making this layer multi-functional, the patent reduces the need for additional separate protective structures, thereby limiting the increase in device complexity.
Data Source
AI summary
In the embodiments of the present invention, a glass substrate in a micro display panel includes a first surface and a second surface arranged opposite to one another, and a first terminal and a second terminal arranged opposite to one another. An insulation layer disposed on the first surface. A thin film transistor layer disposed on a surface of the insulation layer away from the glass substrate. A micro light-emitting diode layer disposed on a surface of the thin film transistor layer away from the insulation layer. A terminal of the insulation layer, the thin film transistor layer, and the micro light-emitting diode layer close to the first terminal is bent toward a side away from the second surface, and an interval is defined between a terminal of the insulation layer close to the first terminal and the first terminal.