Touch Display Panel Thickness Reduction via Layer Segmentation
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Solution Overview
Problem
Active-matrix organic light-emitting diode display panels face challenges in reducing thickness to enhance the reliability and flexibility of flexible display devices, which is essential for their wide application in thin, bendable, and foldable devices.
Innovation Solution
A touch display panel design that includes a substrate with light emitting and non-light emitting regions, an anode, pixel defining layers, an organic functional layer, encapsulation layer, and touch units disposed between these layers, along with cathodes and an antireflection protective layer, optimizing the thickness and structural arrangement to achieve a thinner profile while maintaining dynamic bending performance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional display panel structures are used, then structural stability is maintained, but thickness cannot be reduced sufficiently
Solution Approach 1:
The pixel defining layer is divided into multiple sub-layers (first pixel defining sub layer, second pixel defining sub layer, etc.), allowing the touch units to be positioned within these subdivided layers. This segmentation enables thinner overall structure while maintaining the necessary functional separation and structural stability.
Solution Approach 2:
The touch units are nested within the pixel defining layers and encapsulation structure. Specifically, touch units are disposed between pixel defining sub layers, and the encapsulation layer encloses these nested components. This nesting approach reduces overall thickness while protecting the embedded touch units, resolving the contradiction between thinness and structural stability.
2Length of moving object
If touch units are disposed outside the encapsulation layer, then manufacturing is simpler, but the panel thickness increases and reliability decreases
Solution Approach 1:
The touch units are positioned within the pixel defining layers during the manufacturing process, before the encapsulation layer is fully formed. The encapsulation layer is then deposited to enclose the touch units. This preliminary positioning approach allows for simpler manufacturing compared to post-encapsulation integration, while achieving the desired thin profile and reliability.
3Length of moving object
If the pixel defining layers are made thinner, then overall panel thickness is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The pixel defining layer is segmented into multiple sub-layers with specific thickness ranges (e.g., first pixel defining sub layer: 0.5-2.0 μm, second pixel defining sub layer: 0.5-2.0 μm). This segmentation distributes the thickness control requirement across multiple layers, making it more manageable for manufacturing while achieving the overall thin profile goal.
Data Source
AI summary
The present application provides a touch display panel, because a plurality of touch units is disposed between a first pixel defining layer and a second pixel defining layer, and/or, the plurality of touch units is disposed between the second pixel defining layer and an encapsulation layer, thereby making a thickness of the touch display panel be thinner.