OLED Microlens Offset for Viewing Angle Symmetry
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Solution Overview
Problem
Existing OLED display panels suffer from poor viewing angle symmetry due to alignment deviations in the Micro Lens Pattern (MLP) structure, which affects the convergence of light and efficiency.
Innovation Solution
The display panel incorporates a periodic arrangement of microlens structures offset in different directions relative to their corresponding light-emitting sub-pixels, ensuring that each microlens structure is offset with respect to the center point of the corresponding light-emitting sub-pixel, thereby alleviating the issue of uniform offset and improving viewing angle symmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Micro Lens Pattern (MLP) structure is provided in the OLED screen body to converge divergent light, then light convergence efficiency is improved, but viewing angle symmetry deteriorates due to alignment deviation
Solution Approach 1:
The patent applies asymmetry by intentionally designing the microlens array with different intervals in different directions. Specifically, the interval between adjacent microlenses in the first direction is different from the interval in the second direction, creating an asymmetric structure that compensates for alignment deviations and improves viewing angle symmetry while maintaining light convergence efficiency
Solution Approach 2:
The patent implements local quality by varying the interval between microlenses based on their specific positions and corresponding sub-pixel locations. Each microlens interval is locally adjusted to compensate for alignment deviations at that particular location, thereby improving viewing angle symmetry across different regions of the display panel
2Reliability
If the MLP structure is aligned one-to-one with pixels, then light convergence is improved, but alignment deviation causes viewing angle asymmetry
Solution Approach 1:
The patent applies preliminary anti-action by pre-designing the microlens array with compensated intervals that anticipate and counteract alignment deviations. The asymmetric interval design is established beforehand to offset the expected misalignment between microlenses and sub-pixels, ensuring reliable light convergence and symmetric viewing angles even when manufacturing alignment is not perfect
Solution Approach 2:
The patent implements parameter changes by varying the interval parameter between microlenses in different directions. By changing the spatial parameters of the microlens array from a uniform grid to an asymmetric configuration with different intervals, the system maintains reliable light convergence while compensating for alignment inaccuracies
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 solution enhances the light converging action and visual symmetry of the display panel, improving viewing angle symmetry and light output efficiency by ensuring that the microlens structures are offset in distinct directions, thus mitigating the effects of alignment deviations during manufacturing.
Implementation Method 1
a researcher in the art, based on a geometric optical principle, proposes a technical solution in which a Micro Lens Pattern (MLP) is provided in an OLED screen body, and divergent light emitted from the OLED screen body is converged directly above the screen body
Data Source
AI summary
A display panel and a display device are provided, and include a light-emitting layer and an optical functional layer that are stacked; the optical functional layer includes a first microlens structure and a second microlens structure; the light-emitting layer includes a first light-emitting sub-pixel and a second light-emitting sub-pixel; there is a first interval in a first direction is between a center point of the first microlens structure and a center point of the first light-emitting sub-pixel, there is a second interval in a second direction between a center point of the second microlens structure and a center point of the second light-emitting sub-pixel, and the first direction is different from the second direction.