Shared Light-Emitting Pixel Layout for Leakage-Safe Color Conversion
Solution Overview
Problem
Current display devices using LEDs face challenges in efficiently aligning and manufacturing millions of small LEDs, leading to defective sub-pixels, complex and costly processes, and reduced yields, while also experiencing issues with leakage current and color coordinate distortion.
Innovation Solution
A display device design where one light emitting element is shared among multiple sub-pixels, with color conversion members and a leakage current blocking unit to minimize misalignments and improve manufacturing efficiency, reducing the number of light emitting elements required and simplifying the transfer process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If millions of small LEDs are individually placed and aligned in each sub-pixel, then each sub-pixel can be independently controlled, but the manufacturing process becomes complex and costly with lower yields
Solution Approach 1:
Multiple sub-pixels share a common light emitting element, merging the light generation function across multiple sub-pixels. This reduces the total number of light emitting elements from millions to a manageable quantity, simplifying the transfer and alignment process while maintaining independent sub-pixel control through color conversion members
Solution Approach 2:
A single light emitting element serves multiple sub-pixels simultaneously, making the light emitting element multi-functional. The element can be shared across red, green, and blue sub-pixels, reducing manufacturing complexity while maintaining the ability to control each sub-pixel independently through wavelength-selective color conversion
2Reliability
If millions of small LEDs are individually placed and aligned, then each sub-pixel can emit light independently, but the number of defective sub-pixels increases
Solution Approach 1:
By merging the light emitting function across multiple sub-pixels through a single shared element, the patent reduces the total number of alignment-critical components. This decreases the statistical probability of alignment errors and defective sub-pixels while maintaining sub-pixel independence through optical filtering
3Productivity
If one light emitting element is shared among multiple sub-pixels, then the total number of light emitting elements is reduced, but leakage current may flow to adjacent sub-pixels
Solution Approach 1:
The patent extracts and removes leakage current paths from the system by implementing isolation structures between sub-pixels. This allows the beneficial sharing of light emitting elements while eliminating the harmful leakage current effect that would otherwise compromise sub-pixel independence
4Ease of manufacture
If one light emitting element is shared among multiple sub-pixels, then manufacturing costs are reduced, but color coordinate distortion may occur
Solution Approach 1:
The patent applies local quality by providing each sub-pixel with customized color conversion members tailored to its specific color requirements. Each sub-pixel region has optimized optical filtering properties that ensure accurate color coordinates despite sharing a common light emitting element, maintaining color precision while achieving manufacturing cost reductions
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
This approach reduces manufacturing costs, minimizes leakage current, and enhances display quality by allowing for a high-efficiency, low-power display capable of displaying multiple colors with improved color accuracy.
Implementation Method 1
a plurality of color conversion members disposed on the light emitting element in each of the plurality of sub-pixels
Data Source
AI summary
A display device can include a plurality of pixels disposed on a substrate, at least two sub-pixels disposed in a same pixel among of the plurality of pixels, a light emitting element disposed in the same pixel, and a plurality of color conversion members disposed in the at least two sub-pixels. Each of the plurality of color conversion members overlaps with at least a portion of the light emitting element. Also, the light emitting element is shared by the at least two sub-pixels in the same pixel.