Quantum Dot Color Filter Layout for MicroLED Alignment Shift
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Solution Overview
Problem
The formation of a color filter layer in quantum dot color filters (QDCF) for microLED displays is prone to displacement, leading to incomplete coverage of microLEDs and resulting in color shift and reduced display color accuracy.
Innovation Solution
A quantum dot color filter design with a light-shielding planarization layer and pixel layer, where each pixel includes a light-transmissive region and a light-shielding region, ensuring the pixel units overlap with both areas, and a lighting module with light-blocking structures between chips to prevent color shift and ensure complete coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional color filter layer is formed for microLED displays, then the manufacturing process can be completed, but the color filter layer is prone to displacement causing incomplete coverage of microLEDs
Solution Approach 1:
The patent applies preliminary action by forming a light-shielding planarization layer with protruding portions before forming the color filter layer. These protruding portions serve as pre-established alignment features that guide the positioning of the color filter layer, ensuring accurate coverage of microLEDs even if displacement occurs during manufacturing. The light-shielding layer acts as a buffer that compensates for potential misalignment.
Solution Approach 2:
The patent implements beforehand cushioning by designing the light-shielding planarization layer with protruding portions that extend beyond the microLEDs. These protruding portions create a buffer zone that compensates for potential displacement of the color filter layer, ensuring that the microLEDs remain fully covered even if alignment shifts occur during the manufacturing process.
2Device complexity
If the color filter layer is formed without compensation structures, then the manufacturing process is simpler, but displacement causes incomplete coverage and color shift
Solution Approach 1:
The light-shielding planarization layer with protruding portions is formed in advance as a compensation structure. These protruding portions extend beyond the microLED boundaries to create a buffer zone that compensates for potential displacement. This preliminary compensation structure ensures that even if the color filter layer shifts during manufacturing, the microLEDs remain fully covered, maintaining color accuracy without significantly increasing overall device complexity.
3Quantity of substance
If the pixel units are sized to exactly cover the lighting chips, then material usage is optimized, but any alignment shift results in incomplete coverage
Solution Approach 1:
The light-shielding planarization layer includes protruding portions that extend beyond the lighting chips, creating a buffer zone. This beforehand cushioning ensures that even if alignment shifts occur during manufacturing, the pixel units (color filter layer) remain fully covered by the light-shielding protrusions, maintaining complete coverage of the lighting chips. The buffer zone absorbs the misalignment without requiring excessive material in the pixel units themselves.
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 prevents color shift and ensures complete coverage of microLEDs, maintaining color accuracy and display quality by ensuring the quantum dot and filter layers cover the lighting chips, even if alignment shifts occur during manufacturing.
Implementation Method 1
a light-shielding planarization layer, and a pixel layer. The light-shielding planarization layer is disposed on the substrate, and is configured to define the light-shielding region of each of the pixels
Implementation Method 2
Each of the red pixel units includes a red quantum dot layer, each of the green pixel units includes a green quantum dot layer
Implementation Method 3
each of the blue pixel units includes a transparent layer having diffusion particles
Data Source
AI summary
A quantum dot color filter (QDCF) and a display device are provided. The display device includes the QDCF and a lighting module that includes multiple lighting chips. The QDCF includes a substrate, a light-shielding planarization layer, and a pixel layer, and has multiple pixels that correspond to the lighting chips. Each pixel includes a light-transmissive region and a light-shielding region. The light-shielding planarization layer is disposed on the substrate, and is configured to define the light-shielding region of the pixel. The pixel layer is disposed on the light-shielding planarization layer, and includes multiple pixel units. The pixel unit overlaps with the light-transmissive region, and partially overlaps with the light-shielding region of the pixel. In the pixel, an area of each pixel unit is greater than an area of each lighting chip along an orthogonal projection direction.