OLED Pixel Arrangement for High Density and Aperture Ratio
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Solution Overview
Problem
Conventional pixel arrangements in organic light-emitting display panels are limited by the size of mask openings and the distance between them, restricting the increase in pixel density and leading to issues like jagged edges and color casting due to the inability to simultaneously support both rendered and non-rendered pixel arrangements.
Innovation Solution
A novel pixel arrangement featuring staggered sub-pixel placement and rhomboid-shaped pixels, which allows for improved aperture ratio, reduced current density, and increased brightness, while also enabling the same pixel design to be applicable to both rendered and non-rendered configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional pixel arrangement is used with mask openings, then manufacturing process is simple, but pixel density cannot be increased and aperture ratio is limited
Solution Approach 1:
The patent employs asymmetric pixel arrangements including staggered sub-pixel placement where sub-pixels in adjacent rows are offset from each other, and rhomboid-shaped pixels instead of conventional rectangular shapes. This asymmetric design increases pixel density by better utilizing the available pixel area while maintaining compatibility with existing mask manufacturing processes, thus resolving the contradiction between increasing pixel quantity and maintaining manufacturing precision.
Solution Approach 2:
The patent transitions from traditional rectangular grid arrangements to rhomboid-shaped pixels with staggered rows, effectively utilizing diagonal spacing and angular orientations. This dimensional reorganization allows more pixels to be packed into the same area by optimizing spatial distribution in multiple directions, thereby increasing pixel density without requiring higher precision mask openings.
2Quantity of substance
If mask openings are reduced to increase pixel density, then pixel density increases, but manufacturing difficulty and cost increase
Solution Approach 1:
By using asymmetric staggered arrangements and rhomboid shapes, the patent achieves higher pixel density with larger effective pixel areas, which translates to larger mask openings that are easier and less costly to manufacture while still increasing the number of pixels per inch.
Solution Approach 2:
The patent changes the geometric parameters of pixel arrangement from conventional rectangular grids to rhomboid shapes with specific angular orientations and staggered offsets. This parameter optimization allows achieving higher pixel density with relaxed mask opening size requirements, thereby maintaining ease of manufacture while increasing pixel quantity.
3Illumination intensity
If conventional rectangular pixel arrangement is used, then manufacturing is straightforward, but aperture ratio and brightness are limited
Solution Approach 1:
The patent uses asymmetric staggered sub-pixel arrangements and rhomboid-shaped pixels to increase the aperture ratio by reducing gaps between adjacent pixels. This asymmetric design allows more light emission area within the same pixel footprint, thereby increasing brightness while the complexity remains manageable due to the regular repeating pattern of the asymmetric units.
Solution Approach 2:
By adopting rhomboid shapes with angled edges instead of sharp rectangular corners, the patent reduces the dead space between adjacent pixels, effectively increasing the light-emitting aperture area. This geometric optimization enhances brightness while maintaining a relatively simple manufacturing process through standardized rhomboid patterning.
4Quantity of substance
If pixel density is increased with conventional arrangements, then more pixels fit in the display, but color casting and jagged edges occur
Solution Approach 1:
The staggered asymmetric arrangement distributes pixels more evenly across the display surface, reducing the regular periodic patterns that cause moire effects and jagged edges. This irregular spacing maintains high pixel density while improving image quality consistency by eliminating systematic artifacts, thus resolving the contradiction between pixel quantity and image reliability.
Data Source
AI summary
The present disclosure provides a pixel arrangement, including repeating units each having a first to sixth pixel columns. The first pixel column includes a first sub-pixel of an ith pixel row and a second sub-pixel of a (i+2)th pixel row; the second pixel column includes third sub-pixels of a jth pixel row and a (j+2)th pixel row; the third pixel column includes a second sub-pixel of the ith pixel row and a first sub-pixel of the (i+2)th pixel row; the fourth pixel column includes a first sub-pixel of the jth pixel row and a second sub-pixel of the (j+2)th pixel row; the fifth pixel column includes third sub-pixels of the ith pixel row and the (i+2)th pixel row; and the sixth pixel column includes a second sub-pixel of the jth pixel row and a first sub-pixel of the (j+2)th pixel row, where i=1 and j=2; or j=1 and i=2.