OLED Subpixel Arrangement and Luminance Allocation for Color Edge Reduction
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Solution Overview
Problem
Existing high-resolution OLED display devices face challenges in maintaining a high opening ratio while minimizing color edges, particularly when displaying high-contrast images, due to the arrangement of subpixels and the use of metal masks that are difficult to manufacture and prone to defects.
Innovation Solution
A display device with a display unit featuring alternately arranged first and second pixels of different subpixel configurations, combined with a luminance allocation unit that adjusts the luminance of subpixels to reduce color edges, using a driver IC to control the luminance distribution across adjacent subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a metal mask with small openings is used to manufacture high resolution OLED display devices, then the resolution is improved, but the openings are difficult to manufacture and prone to defects
Solution Approach 1:
The invention divides the pixel array into two types of pixels with different subpixel arrangements. Type 1 pixels have subpixels arranged in one pattern while type 2 pixels have subpixels arranged in a different pattern. This segmentation allows the use of a simpler metal mask with larger openings while still achieving high resolution through the alternating arrangement of the two pixel types.
Solution Approach 2:
The invention introduces asymmetric subpixel arrangements in alternating pixels. Instead of using identical symmetric arrangements throughout, type 1 pixels use one arrangement pattern while type 2 pixels use a different pattern. This asymmetry enables the metal mask to have larger, easier-to-manufacture openings while maintaining high resolution display capability.
2Area of stationary object
If subpixels are arranged to increase opening ratio, then the opening ratio is improved, but color edges appear in high-contrast images
Solution Approach 1:
The invention applies different subpixel arrangement patterns to different local regions (type 1 pixels vs. type 2 pixels). By alternating between two different arrangements locally, the invention achieves high opening ratio while the luminance allocation unit compensates for any color edge effects through selective luminance adjustment of adjacent subpixels.
Solution Approach 2:
The invention changes the arrangement pattern parameter alternately between adjacent pixels. Type 1 pixels use one arrangement configuration while type 2 pixels use a different configuration. This parameter change in the arrangement pattern allows optimization of opening ratio while the luminance allocation mechanism adjusts brightness parameters to eliminate color edges.
3Area of stationary object
If a slot-shaped metal mask is used to decrease distance between subpixels, then the opening ratio is improved, but the mask is difficult to manufacture at high resolution
Solution Approach 1:
The invention segments the pixel array into two types with different arrangements, allowing the metal mask to use simpler rectangular openings rather than complex slot-shaped openings. This segmentation enables easier manufacturing while maintaining high resolution through the alternating pattern of type 1 and type 2 pixels.
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 reduces color edges in high-contrast images by optimizing subpixel arrangements and luminance allocation, enhancing the display quality and maintaining a high opening ratio.
Implementation Method 1
In the manufacturing process of the OLED display device
Implementation Method 2
each subpixel emits light of any one of red, green, and blue
Implementation Method 3
The layer of the light-emitting material is formed in a shape corresponding to each opening of the metal mask by deposition
Data Source
AI summary
A display device includes pixels having different arrangements of subpixels and reducing a color edge. The display device includes a display unit where a plurality of first pixels including subpixels of three colors and second pixels including subpixels of the three colors are alternately arrayed in row and column directions, an arrangement of the subpixels in the first pixel and an arrangement of the subpixels in the second pixel differing from each other, and a luminance allocation unit allocating luminance of a subpixel of a first color among the three colors in the first pixel to a subpixel of the first color in the second pixel adjacent to the first pixel with a predetermined ratio and allocating luminance of the subpixel of the first color in the second pixel to the subpixel of the first color in the first pixel adjacent to the second pixel with a predetermined ratio.