Microlens Layout for Uniform OLED Pixel Viewing Angles
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Solution Overview
Problem
Existing light emitting devices with organic electroluminescence elements exhibit differences in view angle characteristics due to varying interference orders of resonators, leading to inconsistent performance across pixels.
Innovation Solution
The device incorporates first and second light emitting elements with specific optical path lengths and corresponding microlenses, ensuring that the area of the incident region is either equal to or larger than the light emission region, thereby maintaining consistent view angle characteristics across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements with different interference orders of resonators are used, then light extraction efficiency or view angle characteristic can be improved, but difference in view angle characteristic between pixels occurs
Solution Approach 1:
The patent applies local quality by adjusting the microlens parameters (diameter, height, shape) specifically for each light emitting element based on its interference order. Different pixels with different resonance characteristics receive customized microlens configurations to compensate for their individual optical properties, ensuring uniform view angle characteristics across the display.
Solution Approach 2:
The patent changes multiple parameters of the microlens structure including diameter, height, and shape according to the interference order of each light emitting element. By varying these geometric parameters, the optical path length and light extraction characteristics are adjusted to balance the view angle performance across different pixel types.
2Manufacturing precision
If microlens parameters are optimized for each light emitting element, then view angle characteristic consistency is improved, but device complexity increases
Solution Approach 1:
The patent segments the microlens array into distinct groups based on the interference orders of underlying light emitting elements. Each segment corresponds to a specific pixel type and receives optimized microlens parameters tailored to its characteristics, allowing independent optimization without affecting other pixel types.
Solution Approach 2:
The patent performs preliminary design and calculation of optimal microlens parameters before manufacturing. By pre-determining the best microlens configurations for each interference order through simulation and analysis, the actual manufacturing process becomes more straightforward, reducing the complexity burden during production.
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 enhances the view angle consistency by optimizing the relationship between the incident and emission regions, improving light utilization and reducing variations between pixels with different interference orders.
Implementation Method 1
Excitons of a luminous organic compound in the organic compound layer are generated by injecting electrons and holes from the pair of electrodes to the organic compound layer, and when the excitons return to a ground state, the organic light emitting element emits light.
Implementation Method 2
In a light emitting element having an optical resonance structure, the light radiation distribution has more components in the front direction.
Implementation Method 3
a first microlens and a second microlens arranged so as to correspond to the first light emitting element and the second light emitting element
Data Source
AI summary
Alight emitting device comprises a first light emitting element and a second light emitting element; and a first microlens and a second microlens arranged so as to correspond to the first light emitting element and the second light emitting element, respectively. The first light emitting element includes a first light emitting layer, the second light emitting element includes a second light emitting layer. Assuming that an area of a region where light entered and passed through the first microlens is defined as S1, an area of the light emission region of the first light emitting layer is defined as S1′, an area of a region where light entered and passed through the second microlens is defined as S2, and an area of the light emission region of the second light emitting layer is defined as S2′, a relationship expressed by|S1-S1′|<|S2-S2′|is satisfied.