OLED Pixel Arrangement Structure for High Resolution and Contrast
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing OLED display panels face challenges in reducing the occupied area of pixel circuits, which limits the resolution and accuracy at low gray scales and full black states, particularly in full-dark-state images, due to the large size of the pixel circuits.
Innovation Solution
The proposed solution involves a pixel arrangement structure with a specific configuration of sub-pixels, including first, second, third, and fourth sub-pixels, arranged in a manner that reduces the distance between them, allowing for a more compact pixel circuit design. This configuration includes virtual diamonds and triangles to optimize the placement of sub-pixels, enabling a balanced pixel ratio and wide color gamut, and includes a driving method for initializing discharge to ensure accurate gray scale and full black display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pixel circuit area is reduced to improve resolution, then the resolution is improved, but the gray scale accuracy and full black display quality deteriorate
Solution Approach 1:
The pixel circuit is divided into two separate circuits: a first pixel circuit for driving the first sub-pixel, and a second pixel circuit for driving the second sub-pixel. This segmentation allows each circuit to be independently optimized, enabling reduced overall pixel area while maintaining sufficient circuit functionality for accurate gray scale control and full black display in each respective sub-pixel
Solution Approach 2:
Adjacent pixel units share common data lines and control lines, merging resource usage across multiple pixels. This reduces redundant circuit elements and minimizes the total occupied area while preserving the electrical pathways necessary for accurate gray scale control and initialization discharge functionality
2Manufacturing precision
If the pixel circuit area is reduced to improve resolution, then the resolution is improved, but the contrast ratio deteriorates
Solution Approach 1:
By separating the pixel circuits for different sub-pixels, each circuit can maintain independent control over its associated OLED, enabling precise initialization discharge that ensures full black levels are achieved without interference from adjacent pixel circuits, thereby preserving high contrast ratio despite reduced area
Solution Approach 2:
An initialization discharge operation is performed before each display frame to discharge any residual charge in the OLED and circuit capacitances. This preliminary action ensures that the display starts from a true black state, maximizing contrast ratio even when the pixel circuit area is minimized
3Manufacturing precision
If sub-pixels are arranged closer together to improve resolution, then the resolution is improved, but the manufacturing complexity increases
Solution Approach 1:
The pixel arrangement employs an asymmetric staggered configuration where odd-row pixel units and even-row pixel units are offset relative to each other. This asymmetric arrangement optimizes spacing between sub-pixels for high resolution while maintaining regular, manufacturable patterns that do not excessively complicate the manufacturing process
Solution Approach 2:
Common data lines and control lines serve multiple adjacent pixel units, making these circuit elements universal rather than dedicated to single pixels. This multi-functionality reduces the total number of circuit elements required, simplifying manufacturing despite the close spacing of sub-pixels needed for high resolution
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A pixel arrangement structure, a pixel circuit, a display panel and a driving method. The pixel arrangement structure includes a first pixel unit (100) including a first sub-pixel (110), a second sub-pixel (120), a third sub-pixel (130) and a fourth sub-pixel (140); a center of the first sub-pixel (110) is coincident with a first vertex of a first virtual diamond (150); a center of the second sub-pixel (120) is coincident with a second vertex of the first virtual diamond (150); a center of the third sub-pixel (130) is coincident with a third vertex of the first virtual diamond (150); and a center of the fourth sub-pixel (140) is coincident with a fourth vertex of the first virtual diamond (150). The pixel arrangement structure, the pixel circuit, the display panel and the driving method can reduce the distance between the sub-pixels and meanwhile reduce the occupied area of the pixel circuit, and hence improve the resolution of the display panel, and can perform initializing discharge on OLEDs in the driving process, ensure the accuracy at a low gray scale and full black under full-dark-state images, and effectively improve the contrast of the entire display panel.