Micro Lens Array Display with Uniform Lens Dimensions
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Solution Overview
Problem
Existing organic light-emitting display devices face limitations in luminance due to light extraction inefficiencies and non-uniform micro lens arrays, leading to increased power consumption and reduced lifespan of the organic light-emitting elements.
Innovation Solution
Incorporating a micro lens array with a uniform vertical dimension, facilitated by an ashing stop film, to enhance light extraction efficiency and introduce a reflective area, along with an auxiliary capacitor to increase capacitance and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional micro lens array is used without an ashing stop film, then the device structure is simpler, but the vertical dimension of the micro lens array is non-uniform resulting in lower light extraction efficiency
Solution Approach 1:
The ashing stop film is formed in advance before the micro lens array structure is created. This preliminary action establishes a uniform reference surface that ensures consistent vertical dimensions for all micro lenses during subsequent fabrication processes, preventing the non-uniformity problem without requiring complex real-time control mechanisms.
Solution Approach 2:
The ashing stop film acts as an intermediary layer between the substrate and the micro lens array structure. This intermediate film provides a controlled interface that enables precise vertical dimension control of the micro lenses while maintaining a relatively simple overall device structure.
2Illumination intensity
If the light emission area is increased to improve luminance, then the brightness increases, but the power consumption increases and the lifespan of organic light-emitting elements decreases
Solution Approach 1:
The invention changes the optical parameters of the system by introducing a micro lens array with uniform vertical dimensions and a reflective electrode pattern. This modifies how light is extracted and distributed, increasing luminance through improved light extraction efficiency rather than simply increasing the light emission area, thereby avoiding the associated power consumption increase.
Solution Approach 2:
The reflective electrode pattern, which could be considered a waste of materials in conventional designs, is converted into a beneficial element that redirects light to improve extraction efficiency. This transforms what would be a harmful reflection loss into a useful light redirecting mechanism that enhances luminance without increasing power consumption.
3Illumination intensity
If the light emission area is increased to improve luminance, then the brightness increases, but the lifespan of organic light-emitting elements decreases
Solution Approach 1:
The invention changes the optical extraction parameters through the micro lens array and reflective pattern, achieving higher luminance from the same light emission area. This parameter change allows maintaining or extending element lifespan by avoiding the increased electrical stress that would result from enlarging the emission area to achieve the same brightness level.
4Illumination intensity
If a reflective electrode pattern is introduced in the circuit area to increase light amount, then the luminance improves, but the device complexity increases
Solution Approach 1:
The reflective electrode pattern serves multiple functions: it acts as a reflective surface to redirect light, provides structural support in the circuit area, and can function as part of the electrical circuitry. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while still achieving improved luminance.
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
Improves luminance, extends the lifespan of the organic light-emitting elements, and stabilizes light emission by enhancing light extraction and reducing power consumption.
Implementation Method 1
a micro lens array which includes a plurality of micro lens patterns and has a uniform vertical dimension
Implementation Method 2
a reflective electrode pattern positioned on the transparent electrode and overlapping the circuit area
Data Source
AI summary
Disclosed is a display device including a substrate including a plurality of sub-pixels, each of the plurality of sub-pixels including a light emitting area, a first planarization film on the substrate, an ashing stop film on the first planarization film, a second planarization film on the ashing stop film and including a micro lens array that overlaps the light-emitting area, and a first electrode on the second planarization film and an exposed face of the micro lens array.