Flexible Display Device With Segmented Pixel Density
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Solution Overview
Problem
Flexible display devices face challenges in reducing leakage current and curvature limitations due to increased pixel density, particularly when bent or folded, as the higher resolution leads to closer pixel row pitches, causing defects like current leakage and line shorts.
Innovation Solution
A flexible display device design featuring a main display area with a higher pixel density and a sub display area with lower pixel density, where the sub pixel rows have greater line pitches, allowing for reduced defects and varied curvature designs during bending or folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel density is increased to improve resolution, then image quality is improved, but leakage current increases due to closer wiring contact
Solution Approach 1:
The patent applies different pixel densities to different regions of the display device. The main display area uses high pixel density for high resolution, while the flexible display area uses low pixel density to reduce leakage current. This local differentiation resolves the contradiction by optimizing each region for its specific function.
Solution Approach 2:
The display device is segmented into two distinct areas: a main display area with high pixel density and a flexible display area with low pixel density. This segmentation allows each region to have optimized characteristics independent of the other, enabling high resolution where needed while minimizing leakage current in the flexible region.
2Measurement precision
If pixel density is increased to improve resolution, then image quality is improved, but radius of curvature cannot be reduced due to wiring contact
Solution Approach 1:
Different regions are assigned different pixel densities suited to their functional requirements. The main display area maintains high pixel density for quality display, while the flexible display area uses low pixel density to enable small radius of curvature and various bending configurations.
Solution Approach 2:
The display is divided into a rigid main display area and a flexible display area with different structural characteristics. This segmentation enables the flexible area to achieve small radius of curvature without the wiring contact problems that would occur if high pixel density were applied throughout the entire display.
3Measurement precision
If pixel rows are closely spaced to increase resolution, then image quality is improved, but line shorts occur during bending
Solution Approach 1:
The patent implements different line pitches in different regions. The main display area has small line pitches for high resolution, while the flexible display area has large line pitches that prevent line shorts during bending operations, thus resolving the reliability issue.
Solution Approach 2:
The display structure is segmented into regions with different line pitch characteristics. The flexible display area uses large line pitches that maintain adequate spacing between conductive lines even when bent, preventing short circuits while the main display area maintains fine line pitches for high resolution.
Data Source
AI summary
A flexible display device includes a display panel including a main display area including a plurality of main pixel rows, and a sub display area at a side of the main display area and including a plurality of sub pixel rows, a scan driving circuit configured to provide scan signals to the main pixel rows via a plurality of main scan lines, and provide the scan signals to the sub pixel rows via a plurality of sub scan lines, a data driving circuit configured to provide data signals to a plurality of pixels respectively located in the main pixel rows and the sub pixel rows, and a timing controller configured to control the scan driving circuit and the data driving circuit, wherein a number of the sub pixel rows is less than a number of the main pixel rows.