OCA Film Segmentation for OLED Gap Widening
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Solution Overview
Problem
Organic light emitting display (OLED) modules are prone to cracks due to widening gaps between glass substrates when subjected to external impacts, leading to potential sealing failures.
Innovation Solution
The use of an optical clear adhesive (OCA) film with specific attaching portions surrounding the display panel, including a rear attaching portion, side attaching portion, and auxiliary attaching portion, to prevent the gap between glass substrates from widening, thereby preventing cracks in the sealing portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the OCA film is attached only to edge portions of the display panel and window, then the device complexity is reduced, but the reliability deteriorates due to gap widening and crack generation under external impacts
Solution Approach 1:
The OCA film attachment structure is segmented into three distinct portions: a front attaching portion attached to the front surface, a rear attaching portion attached to the rear surface, and a side attaching portion connected to side surfaces. This segmentation allows each portion to independently resist forces from different directions, effectively preventing gap widening and crack generation in the sealing portion under external impacts while maintaining structural reliability.
2Ease of manufacture
If the OCA film attaches only the front surface, then the ease of manufacture is improved, but the stability deteriorates as the upper glass substrate can shift under impact
Solution Approach 1:
The attachment structure extends from a single-dimensional front surface attachment to a multi-dimensional configuration involving front surface, rear surface, and side surfaces. By attaching the OCA film to the rear surface and side surfaces in addition to the front surface, the glass substrate is constrained in multiple spatial dimensions, preventing shifting under impact while maintaining manufacturing feasibility.
3Reliability
If the OCA film includes front, rear, and side attaching portions, then the reliability is improved by preventing gap widening, but the device complexity increases
Solution Approach 1:
The OCA film itself serves as a flexible thin film that can conform to and attach to multiple surfaces (front, rear, and side surfaces) of the display panel and window. This flexible film structure provides comprehensive protection against gap widening and crack generation without requiring complex rigid support structures, thereby improving reliability while minimizing the increase in device complexity.
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
The OCA film effectively mitigates external impacts and maintains the integrity of the sealing between glass substrates, preventing cracks and ensuring the structural integrity of the OLED module.
Implementation Method 1
The OCA film attaches the display panel to the window
Data Source
AI summary
A display module includes a display panel, a window and an optical clear adhesive (OCA) film. The display panel has a first surface and a second surface opposite to the first surface. The window has a first surface facing the first surface of the display panel, and a second surface opposite to the first surface of the window. The OCA film attaches the display panel to the window. The OCA film includes a rear attaching portion attached to the second surface of the display panel. Thus, the rear attaching portion of the OCA film surrounds the second surface of the display panel so that a gap between the first glass substrate and the second glass substrate of the display panel is not be widened.