Side Coating Layer for Display Edge Light Leakage and Rigidity
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Solution Overview
Problem
Display devices experience light leakage and visibility issues due to the edge of the polarizing film being smaller than the glass substrate, leading to a step difference that causes light leakage and makes the edge visible to viewers, while also compromising the side rigidity of the display panel.
Innovation Solution
A display device design that includes a polarizing film with a longer length than the glass substrate, a side coating layer to fill the step difference, and a rear coating layer to enhance rigidity, along with an adhesive layer and a heat dissipation film, where the side coating layer is made of an organic material that absorbs light, and the etch stop layer is used to manage the etching process, ensuring proper alignment and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the polarizing film is formed smaller than the glass substrate to avoid interference during grinding, then the grinding process is facilitated, but light leakage occurs at the edge of the display panel and the edge becomes visible
Solution Approach 1:
A side coating layer is introduced as an intermediary element between the glass substrate and the polarizing film edge. This side coating layer fills the step difference and prevents light from leaking through the gap, thereby eliminating the harmful effect while maintaining the manufacturing advantage of having the polarizing film smaller than the glass substrate
Solution Approach 2:
The side coating layer is applied locally only at the peripheral region where the step difference exists between the glass substrate and polarizing film. This localized application addresses the light leakage problem specifically at the edges without affecting the overall structure or requiring changes to the main display area
2Ease of manufacture
If the polarizing film is formed smaller than the glass substrate, then interference during grinding is avoided, but the side rigidity of the display panel is compromised
Solution Approach 1:
The side coating layer is constructed from composite materials including an inorganic layer (such as silicon oxide or silicon nitride) and an organic layer. This composite structure provides both the mechanical support needed for side rigidity and the light-absorbing properties needed to prevent light leakage, thereby simultaneously addressing both the strength and optical requirements
3Object-affected harmful factors
If the polarizing film extends beyond the glass substrate creating a step difference, then light leakage is prevented by the side coating layer, but manufacturing complexity increases due to additional coating and etching processes
Solution Approach 1:
An etch stop layer is formed in advance before the side coating layer. This preliminary action defines the etching groove boundaries and protects underlying structures during the etching process, making the subsequent formation of the side coating layer more straightforward and reducing overall manufacturing complexity
Solution Approach 2:
The side coating layer is divided into multiple segments or layers (inorganic layer and organic layer) with distinct functions. The inorganic layer provides structural support and etch protection, while the organic layer provides light absorption. This segmentation allows each layer to be optimized independently and simplifies the manufacturing process by breaking down the complex coating requirement into manageable steps
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
Prevents light leakage, improves side rigidity, and ensures the edge of the display panel is not visible, while also enhancing safety and durability by covering sharp edges and protecting against external impacts.
Implementation Method 1
the side coating layer is made of an organic material that absorbs light
Implementation Method 2
forming an etching groove along the etching line by wet-etching the glass substrate
Data Source
AI summary
A display device is provided, which prevents light leakage from occurring and allows an edge of a display panel not to be visible. The display device can include a glass substrate provided with a plurality of pixels, a polarizing film provided over the glass substrate, a side coating layer provided over a side of the glass substrate to fill a step difference between the glass substrate and the polarizing film, and a rear coating layer provided below the glass substrate.