LED Display Pixel Layout Using Capacitor Reflection for Light Extraction
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Solution Overview
Problem
Display devices using light emitting diodes (LEDs) face challenges with light leakage and reduced light extraction efficiency due to the spacing between assembly lines, which also impact resolution and production yield.
Innovation Solution
A display device configuration where a storage capacitor is disposed to overlap the space between assembly lines, enhancing light reflection and extraction efficiency, and increasing the capacitance of the storage capacitor to improve resolution and production yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If assembly lines are spaced apart to facilitate manufacturing, then ease of manufacture is improved, but light extraction efficiency deteriorates due to light leakage between assembly lines
Solution Approach 1:
The patent converts the harmful light leakage between assembly lines into a beneficial effect by placing a reflective layer in the space between assembly lines. This reflective layer redirects the leaked light back toward the light-emitting diodes, transforming energy loss into useful light output and improving overall light extraction efficiency
Solution Approach 2:
The patent utilizes the vertical dimension by positioning the reflective layer below the assembly lines at a specific distance. This three-dimensional arrangement allows light to be reflected upward from the bottom, adding another light extraction pathway without interfering with the horizontal manufacturing spacing
2Measurement precision
If assembly lines are spaced closer to improve resolution, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The reflective layer acts as an intermediary element positioned in the space between assembly lines. It mediates the interaction between leaked light and the light-emitting diodes, enabling closer assembly line spacing for improved resolution while maintaining manufacturability through the light-redirection mechanism
3Ease of manufacture
If assembly lines are spaced apart to improve manufacturing, then ease of manufacture is improved, but device complexity increases due to additional components needed
Solution Approach 1:
The reflective layer serves multiple functions simultaneously: it redirects leaked light to improve extraction efficiency, enables closer assembly line spacing for better resolution, and can be integrated with existing manufacturing processes. This multi-functionality reduces the need for additional separate components, thereby limiting 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
This configuration improves light extraction efficiency, enhances resolution by maintaining a high pixel design area, and increases the capacitance of the storage capacitor, leading to better signal sensitivity and production efficiency.
Implementation Method 1
the capacitor is disposed so as to overlap a space between the first assembly line and the second assembly line... the light extraction of the display device can be improved
Data Source
AI summary
According to an aspect of the present disclosure, a display device includes a substrate having an active area and a non-active area where sub pixels are disposed in the active area, a first assembly line and a second assembly line disposed in the sub pixels and being separated from each other to form a separated space, a light emitting diode disposed in the sub pixels and disposed on the first assembly line and the second assembly line, and a capacitor disposed below the first assembly line and the second assembly line. The capacitor is disposed so as to overlap the separated space formed between the first assembly line and the second assembly line. By this configuration, the light extraction of the display device can be improved.