Micro LED Unit Pixel Sidewall Light Blocking for Color Contrast
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Solution Overview
Problem
Micro LED displays face challenges in achieving high color reproducibility and contrast due to light interference between adjacent sub-pixels, which affects image quality.
Innovation Solution
A unit pixel design featuring a transparent substrate with a first light blocking layer having windows for light transmission, an adhesive layer covering the blocking layer, and a second light blocking layer covering the side surfaces of light emitting devices to prevent light interference, along with a method of fabricating these pixels that includes forming these layers and arranging light emitting devices on the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If micro LEDs are arranged densely on a two-dimensional plane to achieve high-resolution displays, then the number of pixels per unit area increases, but light interference between adjacent sub-pixels worsens, degrading color reproducibility and contrast
Solution Approach 1:
The patent introduces a vertical dimension by stacking multiple light emitting devices at different heights (first, second, and third light emitting devices at progressively lower positions). This three-dimensional arrangement allows adjacent pixels to be separated in the vertical direction while maintaining high horizontal density, thereby reducing light interference between sub-pixels while preserving high pixel density.
Solution Approach 2:
The patent divides each pixel into multiple independently controllable light emitting devices (first, second, and third light emitting devices). Each device can be controlled separately, allowing selective activation to reduce interference. Additionally, the use of separate light blocking layers for each device enables independent optical management of each segment.
2Object-affected harmful factors
If light blocking structures are added to prevent light interference between adjacent sub-pixels, then color reproducibility and contrast improve, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines multiple functions into integrated structures. The adhesive layers serve dual purposes: bonding the light emitting devices to the substrate and simultaneously acting as light blocking layers. The connection electrodes are integrated within the adhesive layers, eliminating the need for separate electrode structures. This merging reduces overall device complexity while maintaining effective light interference prevention.
Solution Approach 2:
The adhesive layers perform multiple functions: mechanical bonding, electrical connection, and optical blocking. By making the adhesive layer multi-functional, the patent eliminates the need for separate dedicated light blocking layers, thereby reducing device complexity while achieving the same optical isolation effect.
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
The solution effectively reduces light interference, enhancing color reproducibility and contrast in micro LED displays by blocking unwanted light emissions and improving the overall image quality.
Implementation Method 1
a first light blocking layer disposed on the transparent substrate and having windows that transmit light
Data Source
AI summary
A unit pixel is provided. The unit pixel includes a transparent substrate, a first light blocking layer disposed on the transparent substrate and having windows that transmit light, an adhesive layer covering the first light blocking layer, a plurality of light emitting devices disposed on the adhesive layer to be arranged on the windows, and a second light blocking layer covering side surfaces of the light emitting devices.