Inclined Pixel Electrode Structure for Front-Emitting Displays
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Solution Overview
Problem
Current display devices face challenges in enhancing front emission efficiency and reducing manufacturing costs, particularly in the design and production of pixels with light emitting elements.
Innovation Solution
A display device design featuring a substrate with inclined patterns made of inorganic insulating materials, alternately stacked layers of different refractive indices, and light emitting elements positioned between electrodes, along with contact electrodes and insulating layers, to improve front emission efficiency and reduce manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are placed directly on electrodes without inclined patterns, then manufacturing process is simpler, but front emission efficiency is reduced due to light scattering
Solution Approach 1:
The inclined pattern is divided into multiple inclined surfaces (first inclined surface, second inclined surface, third inclined surface) that segment the light path. Each inclined surface directs light at specific angles to achieve total reflection and improve front emission efficiency while maintaining manageable structural complexity
Solution Approach 2:
The solution transitions from a planar electrode surface to a three-dimensional inclined pattern structure. By adding the vertical dimension through inclined surfaces, the device achieves better light control and front emission efficiency without proportionally increasing manufacturing complexity
2Illumination intensity
If inclined patterns are formed with multiple stacked layers, then light reflection and emission control is improved, but manufacturing process complexity increases
Solution Approach 1:
The inclined pattern uses composite structure with multiple layers having different refractive indices (first layer with refractive index n1, second layer with refractive index n2). This composite approach enhances light reflection and emission control by utilizing optical properties of different materials, while the layered structure can be formed using standard semiconductor manufacturing techniques
Solution Approach 2:
The invention controls light emission by changing optical parameters - specifically the refractive indices of different layers and the inclination angles of surfaces. By adjusting these parameters (refractive index contrast, angle of inclination), the device optimizes front emission efficiency without requiring complex manufacturing processes
3Loss of substance
If light emitting elements are precisely positioned in inclined pattern spaces, then material loss is reduced, but positioning precision requirements increase
Solution Approach 1:
The inclined pattern structure is formed in advance before placing the light emitting elements. The bank pattern and inclined surfaces are pre-formed to define precise spaces, guiding the light emitting elements into correct positions during subsequent processing steps, thereby reducing material loss without requiring extreme positioning precision
Solution Approach 2:
The inclined pattern acts as an intermediary structure between the electrodes and the light emitting elements. It provides physical guidance and defined spaces that facilitate accurate positioning of light emitting elements, reducing the need for high-precision direct positioning while minimizing material loss
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 solution enhances front emission efficiency by total reflection of light and minimizes material loss and manufacturing costs through precise placement and alignment of light emitting elements within the inclined pattern-defined spaces.
Implementation Method 1
The solution enhances front emission efficiency by total reflection of light
Data Source
AI summary
A display device includes a substrate including pixels, a first electrode and a second electrode disposed on the substrate and spaced apart from each other, an inclined pattern disposed on the first electrode and the second electrode, the inclined pattern forming a space, and a first light emitting element disposed between the first electrode and the second electrode inside of the space formed by the inclined pattern.