Micro LED Pixel Layout for Uniform Color and Low Ghosting
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Solution Overview
Problem
Display devices using micro LEDs suffer from biased light distributions due to the crystallinity of the light-emitting devices, leading to color variations when viewed from different directions, as well as unintended parasitic capacitance and ghost phenomena.
Innovation Solution
The implementation of a display device design where each light-emitting device is arranged in a symmetrical configuration relative to its adjacent counterparts, canceling out biased light distributions and reducing parasitic capacitance by aligning electrode positions and orientations.
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 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 mounting arrangement of light-emitting devices to compensate for the inherent asymmetry in light distribution. Specifically, adjacent light-emitting devices are mounted in opposite orientations (e.g., 180 degrees rotated relative to each other) so that their asymmetric light patterns cancel out, achieving uniform color appearance from all viewing angles while maintaining standard manufacturing processes
2Device complexity
If light-emitting devices are arranged in a general configuration, then device layout is simple, but parasitic capacitance occurs due to electric field formation between electrodes of different polarity
Solution Approach 1:
The patent applies preliminary anti-action by pre-arranging the electrode configurations and mounting orientations of light-emitting devices to counteract the formation of parasitic capacitance. By positioning electrodes of opposite polarity in symmetrical patterns and orienting adjacent devices in opposite directions, the electric fields generated by different polarity electrodes cancel each other out, preventing parasitic capacitance accumulation while maintaining layout simplicity
3Ease of manufacture
If light-emitting devices with asymmetric light distribution are used, then manufacturing is easier, but ghost phenomenon occurs due to accumulated parasitic capacitance from multiple devices
Solution Approach 1:
The patent uses asymmetry principle at the system level by arranging adjacent light-emitting devices in opposite orientations. This causes the asymmetric light patterns and associated electric fields from individual devices to cancel out when viewed collectively, preventing ghost phenomenon and display instability while allowing each individual device to maintain its simpler asymmetric structure for ease of manufacture
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 effectively addresses the issue of color variation with viewing direction, reduces parasitic capacitance, and minimizes ghost phenomena, resulting in improved color uniformity and display stability.
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 display device using a micro light emitting diode (LED). Disclosed is a display device using a light-emitting element including a wiring substrate having multiple unit pixel areas defined therein, a wiring electrode including first wiring electrodes and a second wiring electrode arranged on the wiring substrate, and each light-emitting element installed in each unit pixel area so as to be electrically connected to each first wiring electrode and the second wiring electrode to constitute each sub-pixel, wherein the light-emitting elements include a first light-emitting element located in a first pixel area and installed in a first arrangement, and a second light-emitting element located in a second pixel area adjacent to the first pixel area and installed in a second arrangement symmetrical to the first arrangement.