Stacked Micro-LED Pixel Structure for Uniform Viewing Angles
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Solution Overview
Problem
Micro-LED display devices suffer from a dispersion phenomenon due to inconsistent light emission angles of red, green, and blue micro-LEDs, leading to color differences when viewed from different angles, which affects image quality and consistency.
Innovation Solution
Stacking micro-LEDs with different emission wavelengths to form a single light-emitting surface and using an optical module positioned above the stacked structure to ensure all light is emitted at the same angle, thereby reducing color differences across various viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If red, green, and blue micro-LEDs are horizontally laid on a two-dimensional plane, then the display device can be manufactured with simple structure, but the emission angles of light emitted by the three micro-LEDs are inconsistent causing dispersion phenomenon and color difference at different visual angles
Solution Approach 1:
The patent transitions from horizontal two-dimensional arrangement to vertical three-dimensional stacking of micro-LEDs. This dimensional change allows all micro-LEDs to share a common light-emitting surface and emit light at consistent angles, solving the dispersion problem while maintaining manufacturing feasibility through vertical integration processes.
Solution Approach 2:
The patent merges multiple micro-LEDs (red, green, blue) into a single vertical stack structure where they share a common substrate and light-emitting surface. This combining approach ensures uniform emission angles for all color channels, eliminating the dispersion phenomenon that occurs with separate horizontal arrangements.
2Illumination intensity
If an optical module is added to reduce light-emitting angle, then the light-emitting angle can be reduced for small visual angle displays, but the inconsistent emission angles of horizontally laid micro-LEDs still cause dispersion and color difference
Solution Approach 1:
The patent implements preliminary action by ensuring emission angle consistency at the source through vertical stacking before light reaches the optical module. This pre-alignment of emission angles eliminates the need for the optical module to correct angular inconsistencies, allowing the optical module to focus solely on reducing the overall light-emitting angle for small visual angle displays without suffering from dispersion issues.
3Manufacturing precision
If micro-LEDs are stacked vertically, then consistent emission angles and uniform light output are achieved, but the device structure becomes more complex
Solution Approach 1:
The patent segments the display structure into modular vertical stacks, where each stack contains red, green, and blue micro-LEDs arranged vertically. This segmentation allows for standardized manufacturing units that can be replicated across the display, reducing overall complexity through modularity while maintaining emission angle consistency within each stack.
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 ensures consistent light emission from micro-LEDs, minimizing color differences at different visual angles and improving image quality, particularly for displays with small light-emitting angles by adjusting the emission angle to 80° or less.
Implementation Method 1
an optical module, disposed above the light-emitting surface and at a predetermined distance from the light-emitting surface; the optical module being configured to emit, at a second emission angle, the light emitted by the light-emitting surface
Data Source
AI summary
A LED pixel unit, a display panel and a display screen are provided. The LED pixel unit includes: multiple micro-LEDs with different emission wavelengths and an optical module, the micro-LEDs are stacked to form a stacked structure, the stacked structure has a light-emitting surface, and the stacked structure is configured to emit, from the light-emitting surface, light emitted by the micro-LEDs at a first emission angle; the optical module is disposed above the light-emitting surface and at a predetermined distance from the light-emitting surface, and the optical module is configured to emit, at a second emission angle, the light emitted by the light-emitting surface. The light emitted by the micro-LEDs in the same pixel unit is all emitted from the same light-emitting surface, incident on the optical module at the same angle, and emitted from the optical module at the same angle, so that a dispersion phenomenon can be avoided.