Asymmetric Pixel Structure for High PPI OLED Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional RGB pixel arrangements in OLED display panels struggle to achieve high Pixel Per Inch (PPI) while maintaining a full-color display effect, as they compromise on aperture ratio and display quality due to limitations in evaporation processes and sub-pixel arrangement.
Innovation Solution
The proposed pixel structure features a unique arrangement where each pixel unit includes three sub-pixels of different colors, with varying distances and sizes in specific directions, allowing for a more compact layout and improved PPI, while maintaining a full-color display by staggering sub-pixels and optimizing the evaporation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional RGB side-by-side pixel arrangement is used, then aperture ratio can be maintained, but PPI is limited to 200-300 and cannot achieve high-resolution display
Solution Approach 1:
The patent applies asymmetry by using different pixel pitches in the first direction versus the second direction. Specifically, the pixel pitch in the first direction is smaller than in the second direction, creating an asymmetric pixel arrangement that enables higher PPI while maintaining full-color display capabilities. This asymmetric design allows the display to achieve high resolution without the limitations of conventional symmetric RGB side-by-side arrangements.
2Ease of manufacture
If sub-pixels are arranged in straight line, then manufacturing is simplified, but aperture ratio is affected due to required distance from bridge
Solution Approach 1:
The patent transitions from conventional two-dimensional straight-line sub-pixel arrangement to a three-dimensional staggered arrangement. The sub-pixels are positioned at different depths and horizontal positions, creating a staggered configuration that reduces the required distance from the bridge while maintaining manufacturing simplicity. This dimensional change allows the aperture ratio to be improved without significantly complicating the evaporation process.
3Reliability
If three-time evaporation process is used for RGB sub-pixels, then full-color display is achieved, but manufacturing complexity and time increase
Solution Approach 1:
The patent merges the evaporation processes by forming organic light-emitting components for multiple sub-pixels in a single evaporation process. The staggered pixel arrangement allows different colored sub-pixels to be positioned such that one evaporation process can deposit materials for multiple sub-pixel types simultaneously or in sequence without requiring separate evaporation steps, thereby reducing manufacturing time while maintaining full-color display quality.
Data Source
AI summary
A pixel structure and a display panel having the pixel structure are disclosed by the present application. The pixel structure includes a plurality of pixel units arranged in an array. The pixel units are arranged respectively along a first direction and a second direction perpendicular to the first direction. Each of the plurality of pixel units comprises a first sub-pixel, a second sub-pixel, and a third sub-pixel which have different colors. In the second direction, a distance between the third sub-pixels is different from a distance between the first sub-pixels and is different from a distance between the second sub-pixels. According to the pixel structure of the present application, the pixel units can be arranged more compact, therefore the pixel pitch is reduced and the PPI is improved.