Display Panel Insulating Stack for Higher Light Extraction
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Solution Overview
Problem
Existing display devices face challenges in improving light emission efficiency and display quality, particularly as the size of display screens increase and the bezel area decreases, making it difficult to position optical sensors effectively.
Innovation Solution
The display device incorporates a multi-layered insulating structure with varying refractive indices and thicknesses, including inorganic and organic materials, to enhance light transmission and emission efficiency, particularly through the use of a first refractive index of 1.8 to 1.9 and a second refractive index of 1.6 to 1.7, with specific thicknesses and taper angles to optimize light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the display screen size is increased, then the display area is enlarged, but the bezel area is reduced making it difficult to position optical sensors
Solution Approach 1:
The patent positions the optical sensor on the back surface of the display panel rather than in the traditional front bezel area. This dimensional shift from the front surface to the back surface enables sensor placement without compromising the display area, allowing for larger screen-to-body ratios while maintaining sensor functionality.
2Device complexity
If a single-layer insulating structure is used, then the device structure is simple, but light emission efficiency is insufficient
Solution Approach 1:
The patent employs a multi-layer insulating structure with different materials (e.g., inorganic insulating layers and organic insulating layers) having different refractive indices. This composite structure optimizes light emission efficiency by managing total internal reflection at each interface, allowing more light to escape the display device while maintaining structural integrity.
Solution Approach 2:
Different regions of the insulating structure have different refractive indices tailored to specific functions. The inorganic layers provide high refractive index contrast to enhance light extraction, while organic layers provide flexibility and additional optical management. This local differentiation of material properties optimizes overall light emission efficiency.
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 structure improves both front and side light emission efficiency, enhancing the overall display quality and light transmission, especially in flexible and curved display devices.
Implementation Method 1
a second sensing insulating layer positioned on the sensing electrode and overlapping the pixel opening, and a third sensing insulating layer disposed on the sensing electrode and the second sensing insulating layer... the second sensing insulating layer has a first refractive index and includes a first sub-sensing insulating layer including an inorganic material and a second sub-sensing insulating layer having a second refractive index and including an organic material, wherein the first refractive index is greater than the second refractive index
Data Source
AI summary
A display device includes a pixel defining layer on a first electrode and including a pixel opening overlapping the first electrode, an encapsulation layer on the pixel defining layer and the first electrode, a sensing electrode on the encapsulation layer, a second sensing insulating layer on the sensing electrode and overlapping the pixel opening, and a third sensing insulating layer on the second sensing insulating layer and the sensing electrode. The second sensing insulating layer includes a first sub-sensing insulating layer including an inorganic material and having a first refractive index, and a second sub-sensing insulating layer including an organic material and having a second refractive index, the first refractive index being greater than the second refractive index.