Micro LED Pixel Wall Heights for Wide-Angle Color Uniformity
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Solution Overview
Problem
Micro LED display panels experience a color shift phenomenon when viewed from large angles due to the differing light-emitting patterns of red, green, and blue LEDs, with red light being more concentrated in the forward direction, making it difficult to cover a large angle range.
Innovation Solution
The micro LED display panel design includes a substrate with micro LEDs and light-shielding walls of varying heights and wavelengths, where the height of the first light-shielding wall is smaller than the second and third light-shielding walls, allowing for adjustment of the irradiation angle to align the light patterns of different colors, reducing the probability of color shift at large angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If red LED is used to emit light, then the light intensity in forward direction is improved, but the viewing angle range deteriorates
Solution Approach 1:
The patent applies local quality by creating different height levels of light-shielding walls corresponding to different color sub-pixels. Specifically, the red sub-pixel has a lower light-shielding wall height compared to green and blue sub-pixels, allowing red light to propagate at wider angles. This local differentiation in wall height enables each color channel to have optimized viewing characteristics matched to its emission properties.
Solution Approach 2:
The patent employs asymmetry by designing light-shielding walls with different heights for different color sub-pixels within the same pixel structure. The red sub-pixel's light-shielding wall is intentionally made shorter than those of green and blue sub-pixels, creating an asymmetric configuration that compensates for the inherently narrower viewing angle of red LEDs while maintaining the overall pixel integrity.
2Ease of manufacture
If light-shielding walls of uniform height are used, then the manufacturing process is simplified, but the color uniformity at large viewing angles deteriorates
Solution Approach 1:
The patent implements local quality by varying the height of light-shielding walls according to the specific optical requirements of each color sub-pixel. The red sub-pixel region has a lower wall height to extend its viewing angle, while green and blue sub-pixels have higher walls. This localized differentiation maintains color uniformity across large viewing angles while using standardized manufacturing processes for creating the different heights.
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 ensures that the light patterns of different colors are closer, reducing the likelihood of color shift in large-angle regions by adjusting the irradiation angles of the light emitted by the micro LEDs, resulting in a more uniform display.
Implementation Method 1
a first light-shielding wall disposed on the substrate and located beside the first micro LED
Implementation Method 2
a first reflector located within the first light-shielding wall and arranged around the first micro LED
Implementation Method 3
a first transparent insulating layer filled between the first micro LED and the first inclined surface, wherein a refractive index of the first transparent insulating layer is smaller than a refractive index of the first micro LED
Data Source
AI summary
A micro light-emitting diode (LED) display panel including a substrate, a first micro LED, a first light-shielding wall, a second micro LED, and a second light-shielding wall is provided. The substrate includes a plurality of pixel regions arranged in an array. The first micro LED is disposed on one of the pixel regions of the substrate. The first light-shielding wall is disposed on the substrate and located beside the first micro LED. The second micro LED is disposed on the one of the pixel regions of the substrate and located beside the first micro LED. The second light-shielding wall is disposed on the substrate and located beside the second micro LED. A light wavelength of the first micro LED is different from a light wavelength of the second micro LED. A height of the first light-shielding wall is smaller than a height of the second light-shielding wall.