OLED Display Panel Adhesive Layer Gradient Thickness
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Solution Overview
Problem
In OLED display panels, the circular polarizer cannot be completely adhered due to the presence of peripheral circuits for touch elements, resulting in gaps that cause light leakage and reduce display quality.
Innovation Solution
The OLED display panel is designed with a visible area for organic light-emitting diode elements and a non-display area for peripheral circuits, using an adhesive layer between the touch electrode layer and the circular polarizer to ensure firm adhesion without gaps, with the adhesive layer's thickness increasing gradually from the visible area to the non-display area to fill any inter-layer gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer is adhered to the display panel, then ambient light reflection is reduced, but gaps appear at the edge of the visible area due to peripheral circuits, causing light leakage
Solution Approach 1:
The adhesive layer is designed with non-uniform thickness, being thicker at the edges near the peripheral circuits and thinner in the center. This local variation in thickness allows the adhesive to compensate for the height differences caused by peripheral circuits, ensuring complete coverage and eliminating gaps at the edges where light leakage would occur.
Solution Approach 2:
The thickness parameter of the adhesive layer is changed from a uniform value to a gradient distribution. By controlling the adhesive layer thickness to increase towards the edges, the patent accommodates the presence of peripheral circuits while maintaining complete adhesion coverage, preventing light leakage without affecting the polarizer's anti-reflection function.
2Reliability
If the adhesive layer thickness is increased to fill gaps caused by peripheral circuits, then light leakage is prevented, but the structural complexity increases
Solution Approach 1:
Rather than increasing the overall adhesive layer thickness uniformly, the patent applies local quality by making the adhesive layer thicker only where needed - at the edges near peripheral circuits. This targeted approach prevents light leakage without adding unnecessary complexity to the entire adhesive structure.
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
This configuration prevents light leakage by ensuring a gap-free adhesion of the circular polarizer, enhancing display quality by maintaining light within the panel.
Implementation Method 1
an adhesive layer between the touch electrode layer and the circular polarizer, wherein the touch electrode layer is firmly adhered with the circular polarizer through the adhesive layer
Implementation Method 2
a thickness of the adhesive layer at an edge of the visible area increases gradually in a direction from the edge of the visible area to the non-display area
Data Source
AI summary
An organic light-emitting diode display panel, a method for fabricating the same and a display device are provided. The display panel is divided into a visible area and a non-display area, and includes: a base substrate, a plurality of organic light-emitting diode elements on the base substrate, an encapsulation layer on sides of the organic light-emitting diode elements away from the base substrate, a touch electrode layer on the side of the encapsulation layer away from the organic light-emitting diode elements, a peripheral circuit on the touch electrode layer away from the encapsulation layer, a circular polarizer on the sides of the touch electrode layer and the peripheral circuit away from the encapsulation layer, and an adhesive layer between the touch electrode layer and the circular polarizer.