Micro-LED Display Layout With Color Filters to Reduce Mura
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Solution Overview
Problem
Existing display devices face challenges in simplifying the transfer process of micro-LEDs and reducing Mura occurrence due to differences in transfer positions.
Innovation Solution
A display device design that includes a substrate with pixel drive circuits, banks, micro-LEDs, color filters, and a black matrix, optimizing the transfer process and minimizing Mura by unifying micro-LED types and using color filters to align them accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different types of micro-LEDs are used for different subpixels, then color display capability is improved, but transfer process complexity increases and Mura defects occur due to position differences
Solution Approach 1:
The patent divides the micro-LED array into groups: white micro-LEDs for RGB subpixels and black micro-LEDs for non-display areas. This segmentation allows simplified transfer processes while maintaining color display capability through color filters on white micro-LEDs.
Solution Approach 2:
Different treatments are applied to different locations: white micro-LEDs with color filters for display areas, and black micro-LEDs for non-display areas. This local differentiation resolves the contradiction by simplifying the overall transfer process while maintaining color capability where needed.
2Ease of manufacture
If transfer positions of micro-LEDs vary, then manufacturing flexibility is improved, but Mura defects increase due to luminance non-uniformity
Solution Approach 1:
White micro-LEDs with identical structures are used across all RGB subpixels, ensuring homogeneous luminance characteristics. Color filters are then applied to achieve the desired color output, decoupling structural uniformity from color variation.
Solution Approach 2:
Color filters serve as intermediaries between the uniform white micro-LEDs and the final colored display output. This allows manufacturing flexibility with uniform micro-LEDs while achieving color differentiation through the filter layer.
3Measurement precision
If multiple transfer processes are used for different micro-LED types, then color accuracy is improved, but production energy consumption increases
Solution Approach 1:
The patent merges the transfer process for all micro-LEDs into a single unified process, transferring both white and black micro-LEDs together. This reduces production energy consumption while color accuracy is maintained through the color filter layer on white micro-LEDs.
Solution Approach 2:
Color filters are pre-applied to white micro-LEDs before or during the transfer process, ensuring color accuracy is established in advance. This eliminates the need for separate transfer processes for different colored micro-LEDs, reducing energy consumption.
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 process is simplified, reducing energy consumption and effectively minimizing Mura defects by ensuring uniform luminance across pixels.
Implementation Method 1
a plurality of micro-LEDs disposed on the plurality of banks and configured to emit white light
Implementation Method 2
a plurality of color filters disposed on the micro-LED in a first group among the plurality of micro-LEDs
Data Source
AI summary
A display device comprises a substrate, a pixel drive circuit disposed on the substrate, a bank disposed on the pixel drive circuit, a plurality of micro-LEDs disposed on the bank and electrically connected to the pixel drive circuit, a color filter disposed on one of the plurality of micro-LEDs, and a black matrix disposed on another of the plurality of micro-LEDs. Therefore, it is possible to minimize or at least reduce the occurrence of a Mura in accordance with the transfer positions of the plurality of micro-LEDs.