Micro-LED Pixel Pairing to Reduce Color Shift and Ghosting
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Solution Overview
Problem
Display devices using semiconductor light emitting diodes exhibit biased light distributions due to crystallinity, leading to color variations when viewed from different directions and unintended parasitic capacitance, causing ghost phenomena.
Innovation Solution
The use of symmetrically disposed light emitting devices with tilt angles in display devices, where each light emitting device has a side surface inclined to one side, cancels out asymmetrical light distributions and reduces parasitic capacitance by aligning electrode positions symmetrically with respect to the tilt angle, ensuring uniform light emission and reduced electric field effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting devices are mounted in a general arrangement on a wiring substrate, then the display device can be manufactured with standard mounting processes, but the light distribution becomes asymmetrical causing color variation depending on viewing direction
Solution Approach 1:
The patent applies asymmetry principle by intentionally designing the light emitting device structure with an asymmetric reflective cavity that compensates for the asymmetric light distribution caused by mounting orientation. The cavity shape is specifically designed to redirect light in a way that balances the overall light output pattern, allowing standard mounting processes to be used while achieving symmetric light distribution.
2Ease of manufacture
If light emitting devices with tilted crystal surfaces are used, then gallium nitride-based semiconductor can be grown on sapphire substrate, but tilt angle causes asymmetrical light distribution and color variation
Solution Approach 1:
The patent converts the harmful effect of the tilted crystal surface into a beneficial feature by designing the reflective cavity to work in conjunction with the tilt angle. Instead of trying to eliminate the tilt, the cavity geometry is optimized to redirect the tilted light output into a symmetric distribution pattern, thereby converting the manufacturing advantage of using sapphire substrate into a functional benefit for light uniformity.
3Device complexity
If adjacent light emitting devices have different polarity arrangements, then electrical connection can be simplified, but parasitic capacitance accumulates causing ghost phenomenon
Solution Approach 1:
The patent applies inversion principle by alternating the polarity arrangement of adjacent light emitting devices in a checkerboard pattern rather than using uniform polarity orientation. This inversion strategy distributes the electric fields in opposite directions, causing them to cancel each other out and preventing the accumulation of parasitic capacitance that would otherwise cause ghost phenomena.
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 addresses the issue of color variation with viewing direction and parasitic capacitance, resulting in improved color uniformity and reduced ghost phenomena, enhancing the overall display quality by visually reinforcing weak color areas and eliminating electric field-induced issues.
Implementation Method 1
a light emitting diode (LED), as a well-known semiconductor light emitting device that converts current into light
Data Source
AI summary
The present disclosure is applicable to a display device-related technical field, and relates to, for example, a surface light source device using a micro light-emitting diode (LED). The present disclosure comprises: a wiring board having a plurality of unit pixel regions defined; a wiring electrode comprising a first wiring electrode located in a first pixel region on the wiring board, and a second wiring electrode located in a second pixel region on the wiring board; a first light-emitting element electrically connected to the first wiring electrode; and a second light-emitting element electrically connected to the second wiring electrode, wherein the first light-emitting element and the second light-emitting element have a tilt angle formed by a side surface being tilted to one side, and the first light-emitting element and the second light-emitting element may be symmetrically positioned with respect to the tilt angle.