Micro-LED Encapsulation Structure for Side-Light Use and Color Stability
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Solution Overview
Problem
Micro-LED displays face challenges in achieving high environmental contrast ratio and low reflectivity, leading to inefficient light energy utilization and color shift at wide viewing angles due to inadequate encapsulation methods that fail to utilize side-emitted light and are prone to light-emitting device position displacement.
Innovation Solution
A display screen encapsulation structure featuring a transparent layer covering light-emitting devices, a light-shielding layer with a surface not exceeding the light-emitting device thickness, and an encapsulation layer, which improves light energy utilization and prevents color shift by ensuring the light-shielding layer's surface is not higher than the light-emitting surface, thereby optimizing light distribution and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a patterned black matrix is prepared on an upper cover plate to achieve high environmental contrast ratio and low reflectivity, then picture quality is improved, but light energy utilization is reduced and color shift occurs at wide viewing angles due to light-emitting device position displacement
Solution Approach 1:
The patent introduces a transparent layer that wraps around the light-emitting devices from the side, transitioning from traditional top-down encapsulation to a three-dimensional side-encapsulation approach. This enables collection of side-emitted light that would otherwise be lost, improving light energy utilization while maintaining the optical performance benefits of the black matrix structure
Solution Approach 2:
The transparent layer acts as an intermediary structure between the light-emitting devices and the external environment. It provides mechanical support to prevent position displacement of the light-emitting devices, thereby eliminating color shift at wide viewing angles while allowing light to pass through to the black matrix for contrast enhancement
2Reliability
If traditional encapsulation methods are used to protect light-emitting devices, then device protection is achieved, but position displacement occurs leading to color shift at wide viewing angles
Solution Approach 1:
The transparent layer extends from the top surface down the sides of the light-emitting devices, creating a three-dimensional encapsulation structure. This side-encapsulation approach provides mechanical constraint that prevents position displacement while maintaining optical transparency, solving both protection and positioning issues simultaneously
3Ease of operation
If light-emitting devices are spaced apart to enable individual control, then device functionality is improved, but gap areas create light loss and reduce overall light energy utilization
Solution Approach 1:
The transparent layer continuously wraps around each light-emitting device and extends into the gap areas between devices. This continuous structure captures side-emitted light from all devices including those in gap regions, ensuring that light energy is utilized throughout the entire display area rather than being lost in the spaces between devices
Data Source
AI summary
A display screen encapsulation structure includes: a drive substrate including a display area and a non-display area surrounding the display area; multiple light-emitting devices spaced apart in the display area; a transparent layer covering the light-emitting devices, and filling a gap area between the multiple light-emitting devices and a peripheral area; a light-shielding layer covering parts of the transparent layer in the gap area and the peripheral area; and an encapsulation layer covering the light-shielding layer and parts of the transparent layer on the light-emitting devices. A side of each light-emitting device facing away from the drive substrate is provided with a light-emitting surface. A surface of the light-shielding layer away from the drive substrate is not higher than the light-emitting surface of each light-emitting device. The display screen encapsulation structure realizes planarization of the drive substrate and improves a light utilization rate of sides of the light-emitting devices.