OLED Pixel Row Structure for Resolution and Color Stability
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Solution Overview
Problem
Conventional OLED display panels face challenges in improving resolution and brightness due to difficulties in precision during the fine metal mask (FMM) process, leading to color shifting and production issues, especially with the conventional RGB stripe pixel structure.
Innovation Solution
A display panel design featuring alternately arranged first, second, and third pixel rows, where the first pixel is positioned within a virtual geometric shape formed by adjacent second and third pixels, with areas inversely proportional to their luminous efficiencies, and shapes that are convex or concave arcs, reducing color shift and manufacturing difficulties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional RGB stripe pixel structure is used to improve resolution, then pixel density can be increased, but manufacturing precision deteriorates due to FMM process difficulties
Solution Approach 1:
The pixel structure is segmented into sub-pixels with different arrangements (first pixel rows with first pixels, second pixel rows with second and third pixels arranged alternately). This segmentation allows each sub-pixel type to be optimized independently for manufacturing while achieving high overall resolution through their combined arrangement.
Solution Approach 2:
The patent employs asymmetric pixel arrangements where first pixels, second pixels, and third pixels have different configurations and areas. The first pixel is positioned within a virtual geometric shape formed by adjacent second and third pixels, creating an asymmetric layout that simplifies the FMM fabrication process while maintaining high pixel density.
2Measurement precision
If pixel area is reduced to improve resolution, then pixel pitch can be decreased, but color mixing worsens due to closer light emitting areas
Solution Approach 1:
The patent transitions from conventional linear stripe arrangements to a two-dimensional alternating pattern where first pixels, second pixels, and third pixels are arranged in multiple dimensions. The first pixel is positioned within a virtual geometric shape formed by second and third pixels, creating spatial separation in multiple directions that prevents color mixing while maintaining high resolution.
Solution Approach 2:
Different pixel types (first, second, third pixels) have different areas that are inversely proportional to their luminous efficiencies. This local quality optimization ensures that each pixel type contributes appropriately to the overall display quality while maintaining sufficient separation to prevent color mixing.
3Stability of the object's composition
If different pixel areas are used to optimize luminous efficiency, then color stability can be improved, but device complexity increases due to multiple pixel types
Solution Approach 1:
The patent applies local quality by assigning different areas to different pixel types based on their specific luminous efficiencies. The area of each pixel type is inversely proportional to its luminous efficiency, allowing each pixel to contribute equally to the overall brightness while maintaining color stability. This localized optimization is achieved through a systematic alternating arrangement rather than random variation.
Solution Approach 2:
The patent merges multiple pixel types (first, second, third pixels) into a unified alternating arrangement pattern. The first pixel is positioned within a virtual geometric shape formed by adjacent second and third pixels, creating an integrated structure where different pixel types work together harmoniously. This merging approach manages complexity by establishing a regular, repeating pattern rather than requiring independent design of each pixel region.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents color drift within a predetermined range, enhances the aperture ratio, and extends the lifetime of OLED display panels by optimizing pixel arrangement and luminous efficiency ratios.
Implementation Method 1
The principle of light emission of the OLED display devices is that a semiconductor material and an organic light emitting material are driven by an electric field to cause light emission through carrier injection and recombination
Implementation Method 2
Luminescent material layers of pixels in conventional organic light emitting diode (OLED) display panels are generally formed by evaporation processes
Data Source
AI summary
A display panel is provided. The display panel includes at least two first pixels, at least two second pixels, and at least two third pixels. An area of the first pixel, an area of the second pixel, and an area of the third pixel are inversely proportional to a luminous efficiency of a luminescent material of the first pixel, a luminous efficiency of a luminescent material of the second pixel, and a luminous efficiency of a luminescent material of the third pixel, respectively. The disclosure can avoid the drawback of color shift of the display panel.