Foldable Display Glass Substrate with Variable Thickness
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Solution Overview
Problem
Foldable display devices are prone to generating creases during use, which affects user experience and is a significant challenge in the display industry.
Innovation Solution
A foldable display module is designed with a glass substrate that is thinned to a thickness of less than or equal to 100 microns in the foldable region, allowing for flexibility while maintaining rigidity, thus eliminating the need for additional support components and adhesive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional thick glass substrate is used, then rigidity is improved, but flexibility is worsened
Solution Approach 1:
The glass substrate is designed with non-uniform thickness: the first region (foldable region) has thickness of 50-100 micrometers to provide flexibility, while the second region (non-foldable region) has thickness of 200-500 micrometers to provide rigidity. This local quality differentiation resolves the contradiction between rigidity and flexibility.
Solution Approach 2:
The glass substrate is segmented into two distinct regions with different thicknesses: a first region corresponding to the foldable region and a second region corresponding to the non-foldable region. This segmentation allows each region to have optimized properties for its specific function.
2Strength
If adhesive layers are used to support the display structure, then structural support is improved, but crease formation is worsened
Solution Approach 1:
The invention removes the adhesive layer from the structure by making the glass substrate itself self-supporting through its optimized thickness distribution. The thin first region provides flexibility while the thick second region provides structural support, eliminating the need for adhesive layers that cause creases.
Solution Approach 2:
The glass substrate acts as an intermediary structure that replaces the adhesive layer's support function. By designing the substrate with varying thickness, it simultaneously provides both flexibility where needed and structural support where needed, mediating between the conflicting requirements.
3Stability of the object's composition
If multiple support components are added, then structural stability is improved, but device complexity is worsened
Solution Approach 1:
The glass substrate is designed to perform multiple functions simultaneously: it serves as both the display support structure and the rigid backing, eliminating the need for separate support components like back plates and foam layers. The varying thickness provides both flexibility and structural stability in a single component.
Solution Approach 2:
The invention merges the functions of multiple components (back plate, foam layer, adhesive layers) into a single glass substrate with non-uniform thickness. This consolidation maintains structural stability while reducing device complexity.
Data Source
AI summary
The present application provides a foldable display module and a foldable display device. The foldable display module includes a foldable region and a non-foldable region adjacent to the foldable region, and further includes a display main body structure and a glass substrate. The glass substrate is disposed on a back side of a light emitting surface of the display main body structure, and a thickness of a portion of the glass substrate corresponding to the foldable region is less than or equal to 100 microns.