OLED Microlens Slit Pattern for Higher Luminance and Lower Leakage
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Solution Overview
Problem
In OLED display devices, most of the light generated in the emitting layer is lost, leading to inefficient light emission and reduced lifespan due to increased power consumption when higher currents are applied to enhance luminance.
Innovation Solution
The OLED display device incorporates a slit pattern corresponding to the rotation angle of a microlens at the subpixel periphery, featuring microlenses with different rotation angles and a slit pattern between adjacent subpixels to improve pattern matching and reduce light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a larger current is applied to the light emitting diode to increase luminance, then the luminance is improved, but the power consumption is increased and the lifetime is reduced
Solution Approach 1:
The patent changes the optical parameters of the system by introducing a microlens array with specific rotation angles and a slit pattern structure. This modifies the light extraction parameters, enabling more efficient light emission without increasing current, thus improving luminance while reducing power consumption requirements
Solution Approach 2:
The microlens array and slit pattern act as intermediary optical elements between the light emitting diode and the external environment. These intermediaries optimize the light extraction process, improving luminance efficiency without requiring additional current input
2Illumination intensity
If a larger current is applied to the light emitting diode to increase luminance, then the luminance is improved, but the lifetime is reduced
Solution Approach 1:
The patent modifies the optical extraction parameters through microlens rotation angle optimization and slit pattern design, enabling higher luminance at lower current levels, thereby extending the operational lifetime of the OLED device
Solution Approach 2:
The optical intermediary structures (microlens array and slit pattern) improve light extraction efficiency, allowing the device to achieve desired luminance levels with reduced stress on the light emitting diode, thus extending its operational life
3Device complexity
If existing technologies are used without a slit pattern, then the device structure is simpler, but the pattern matching rate and accuracy of measured position are reduced
Solution Approach 1:
The slit pattern is pre-configured with specific geometric parameters and rotation angles that correspond to the microlens arrangement. This preliminary structural configuration enables the inspection system to automatically achieve high pattern matching rates and measurement accuracy without requiring complex real-time adjustments
4Device complexity
If existing technologies are used without a slit pattern, then the device structure is simpler, but the light leakage between adjacent subpixels is not reduced
Solution Approach 1:
The slit pattern acts as a segmentation structure that divides and confines light emission within each subpixel region. The slit bars create optical boundaries that prevent light from adjacent subpixels from mixing, thereby reducing light leakage while maintaining a relatively simple overall device structure
Solution Approach 2:
The slit pattern introduces localized optical control at the boundaries between subpixels. By configuring slits with specific widths, spacing, and rotation angles at these critical locations, the patent achieves effective light leakage reduction without requiring complex modifications to the entire device 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 design enhances light extraction efficiency, minimizes light leakage, and improves the accuracy of measured positions, thereby increasing luminance while reducing power consumption and extending device lifespan.
Implementation Method 1
the top surface of the overcoat layer in each of the adjacent two of the plurality of subpixels includes a plurality of microlenses
Implementation Method 2
a slit pattern corresponding to the rotation angle of the plurality of microlenses in one of the adjacent two subpixels... reduces light leakage between adjacent subpixels
Data Source
AI summary
An organic light emitting diode display device includes a substrate having a plurality of subpixels. The device includes an overcoat layer on the substrate. The device includes a light emitting diode in each of the plurality of on the overcoat layer. In some embodiments, a top surface of the overcoat layer in adjacent two of the plurality of subpixels includes a plurality of microlenses having different rotation angles. The top surface of the overcoat layer between the adjacent two of the plurality of subpixels includes a slit pattern corresponding to the rotation angles of the plurality of microlenses.