Cross-Shaped Green Subpixel for Moiré Reduction in OLED Displays
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Solution Overview
Problem
Display devices, particularly OLEDs, face issues with luminance deviation and moiré interference due to subpixel and camera sensor interactions, leading to reduced compensation performance and undetected panel stains.
Innovation Solution
The use of red, first green, and second green subpixels with specific emission area shapes, such as cross and slanted cross configurations, along with blue subpixels, to reduce high-frequency moiré components and enhance luminance compensation, allowing for effective stain detection and elimination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If camera compensation is performed using a conventional subpixel arrangement, then luminance deviation can be detected, but moiré interference occurs between subpixels and camera sensors reducing measurement precision
Solution Approach 1:
The green subpixel is designed with an asymmetric cross shape instead of a conventional symmetric arrangement. This asymmetric geometry disrupts the periodic interference pattern between subpixels and camera sensors, thereby eliminating moiré while maintaining luminance measurement capability
Solution Approach 2:
Only the green subpixel is given the special cross shape while red and blue subpixels maintain conventional shapes. This localized modification targets the specific frequency range where moiré occurs without affecting other color channels, optimizing the balance between eliminating interference and maintaining measurement precision
2Object-affected harmful factors
If the green subpixel emission area width is increased along horizontal and vertical directions, then high frequency moiré components are reduced, but the subpixel area and potential overlap with adjacent subpixels increases
Solution Approach 1:
The cross shape distributes the increased emission area along the horizontal and vertical axes rather than expanding uniformly in all directions. This asymmetric expansion reduces high-frequency moiré components while controlling the overall area increase compared to a circular expansion
3Reliability
If a cross shape green subpixel is used, then moiré is eliminated and minute stains can be compensated, but the manufacturing complexity increases
Solution Approach 1:
The complex cross shape is applied only to the green subpixel rather than all subpixels, minimizing the additional manufacturing complexity while achieving the desired stain compensation capability. This localized approach reduces fabrication difficulty compared to redesigning the entire subpixel array
Data Source
AI summary
A display device includes: a substrate having red, first green, second green and blue subpixels; a driving thin film transistor in each of the red, first green, second green and blue subpixels on the substrate; and a light emitting diode connected to the driving thin film transistor and in each of the red, first green, second green and blue subpixels, wherein the light emitting diodes of the red, first green, second green and blue subpixels includes red, first green, second green and blue emission areas, respectively, and wherein the first green emission area has a cross shape.