Dual-Sided MicroLED Layout for High Aperture and Low Crosstalk
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Solution Overview
Problem
Conventional microLED displays suffer from low aperture ratio and optical crosstalk due to limitations in photolithography and etching techniques, which reduce display quality.
Innovation Solution
A dual-sided microLED display design incorporating top-emission and bottom-emission LEDs with a spacer, transparent electric wires, and a black matrix that covers LEDs and data lines but not transparent electric wires, along with light blocking layers to enhance aperture ratio and prevent optical crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the width of electric wires is reduced to enhance aperture ratio, then the aperture ratio is improved, but the manufacturing precision is limited by photolithography and etching techniques
Solution Approach 1:
The patent uses transparent electric wires that are visually indistinguishable from the surrounding transparent substrate, effectively making them 'invisible' in the optical field. This allows the wires to occupy minimal visual space while maintaining their electrical function, thereby increasing the aperture ratio without requiring extreme miniaturization that would challenge manufacturing precision
Solution Approach 2:
The transparent electric wires replicate the optical properties of the transparent substrate, making them optically invisible. This copying of transparency allows the wiring structure to be present without reducing the light-transmissive area, effectively resolving the contradiction between having necessary electrical connections and maximizing aperture ratio
2Area of stationary object
If conventional single-sided microLED displays are used, then the device complexity is low, but the aperture ratio is limited
Solution Approach 1:
The patent transitions from a single-sided display architecture to a dual-sided display architecture, utilizing both the top and bottom surfaces of the microLEDs for light emission. This dimensional expansion allows the aperture ratio to be effectively doubled, as both sides of each microLED contribute to the light-transmissive area, while the added complexity is offset by the symmetrical and systematic design of the dual-sided structure
3Area of stationary object
If transparent electric wires are used to increase aperture ratio, then the aperture ratio is improved, but optical crosstalk may occur
Solution Approach 1:
The transparent electric wires are designed to be optically invisible, matching the refractive index and transparency of the surrounding substrate. This eliminates visual boundaries and reduces light scattering at wire interfaces, thereby minimizing optical crosstalk while maintaining high aperture ratio
Solution Approach 2:
The transparent electric wires act as optical intermediaries that guide and confine light signals along their length without significant leakage or scattering. Their transparent nature allows them to serve as both electrical conductors and optical waveguides, preventing crosstalk between adjacent signal lines while maintaining the high aperture ratio required for display quality
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 design significantly increases the aperture ratio and reduces optical crosstalk, thereby improving display quality and efficiency.
Implementation Method 1
The top-emission LED emits light upward, and the bottom-emission LED emits light downward
Implementation Method 2
The black matrix (BM) covers the plurality of LEDs and data lines but not covers the transparent electric wires
Implementation Method 3
The transparent electric wires are disposed in the plurality of pixels
Implementation Method 4
The black matrix (BM) covers the plurality of LEDs and data lines but not covers the transparent electric wires
Data Source
AI summary
A light-emitting diode (LED) display includes a top-emission LED that emits light upward; a bottom-emission LED that emits light downward; and a spacer disposed between the top-emission LED and the bottom-emission LED, thereby providing a dual-sided display.