Pentile OLED Display Panel Subpixel Circuit Segmentation
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Solution Overview
Problem
Conventional OLED display devices with pentile pixel structures drive all red, green, and blue sub-pixels under the same conditions, leading to reduced resolution and potential issues like mura and afterimages due to shared driving conditions.
Innovation Solution
The OLED display device is designed with a pentile pixel structure where green sub-pixels can be driven under different scan times and off period ratios compared to red and blue sub-pixels, using separate sub-pixel circuits and drivers to optimize the driving conditions for each color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If all sub-pixels (red, green, blue) are disposed in the same row and driven under the same driving conditions, then the device structure is simple and easy to manufacture, but the resolution is reduced and mura/afterimage issues occur
Solution Approach 1:
The patent segments the sub-pixels into different rows based on color: green sub-pixels are disposed in a first row while red and blue sub-pixels are disposed in a second row. This segmentation allows different driving conditions to be applied to different color groups, resolving the contradiction between manufacturing simplicity and resolution quality by enabling independent optimization of driving parameters for each color channel.
2Device complexity
If all sub-pixels are driven under the same driving conditions, then the control system is simple, but mura and afterimage effects occur due to insufficient optimization for each color
Solution Approach 1:
The patent divides sub-pixels into different rows (green in first row, red and blue in second row) to enable segmented driving control. This allows the control system to apply different driving conditions to different color groups, eliminating mura and afterimage effects while maintaining manageable system complexity through organized row-based control architecture.
3Object-affected harmful factors
If green sub-pixels are driven with optimized scan times and off period ratios, then mura and afterimages are reduced, but the device requires separate sub-pixel circuits and drivers increasing complexity
Solution Approach 1:
The patent implements segmentation by disposing green sub-pixels in a separate row from red and blue sub-pixels, enabling independent driving control. This row-based segmentation allows optimized scan times and off period ratios for green sub-pixels to reduce mura and afterimage effects, while the modular row structure keeps the increased complexity organized and manageable.
Solution Approach 2:
The patent applies local quality by providing different driving conditions specifically tailored to green sub-pixels (different scan times and off period ratios) compared to red and blue sub-pixels. This localized optimization addresses the specific characteristics of green OLEDs to eliminate mura and afterimage effects without requiring complete system redesign.
4Ease of manufacture
If sub-pixels are arranged in stripe form with same color sub-pixels in each column, then the manufacturing process is conventional and simple, but the resolution cannot be increased
Solution Approach 1:
The patent employs asymmetry by breaking the conventional stripe arrangement where same-color sub-pixels are aligned in columns. Instead, green sub-pixels are disposed in a separate row from red and blue sub-pixels, creating an asymmetric layout that enables higher resolution while maintaining manufacturability through systematic row-based organization rather than random arrangement.
Data Source
AI summary
A display panel may include a first OLED disposed in a first sub-pixel region and emitting light of a first color, a second OLED disposed in a second sub-pixel region and emitting light of a second color, a third OLED disposed in a third sub-pixel region and emitting light of a third color, a fourth OLED disposed in a fourth sub-pixel region and emitting light of the second color, a first sub-pixel circuit disposed in the first sub-pixel region and driving the third OLED in the third sub-pixel region, a second sub-pixel circuit disposed in the second sub-pixel region and driving the first OLED in the first sub-pixel region, a third sub-pixel circuit disposed in the third sub-pixel region and driving the fourth OLED in the fourth sub-pixel region, and a fourth sub-pixel circuit disposed in the fourth sub-pixel region and driving the second OLED in the second sub-pixel region.