Vertical Stacked Sub-Pixel Arrangement for High Resolution Displays
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Solution Overview
Problem
Conventional display apparatuses face challenges in achieving higher resolution while maintaining pixel aperture ratio and patterning precision, particularly when reducing pixel size, leading to difficulties in sub-pixel patterning and potential shortening of organic EL device life.
Innovation Solution
A display apparatus with a sub-pixel arrangement where the red and blue sub-pixels partially overlap in one direction and green sub-pixels are distant from each other, allowing for adjacent green sub-pixels and overlapping red and blue sub-pixels in one direction, while maintaining the same sub-pixel disposition in the other direction, utilizing a common mask opening for green sub-pixels to improve patterning precision and reduce production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel size is reduced to increase resolution, then resolution is improved, but pixel aperture ratio is reduced
Solution Approach 1:
The patent transitions from conventional planar sub-pixel arrangement to a three-dimensional stacked structure where red, green, and blue sub-pixels are vertically stacked above each other. This vertical stacking enables higher resolution by fitting more sub-pixels within the same pixel area, while the shared transparent electrode structure maintains high aperture ratio by eliminating redundant electrode layers in each sub-pixel.
Solution Approach 2:
The patent implements a shared transparent electrode structure where a single transparent electrode serves multiple sub-pixels (red, green, and blue) simultaneously. This multi-functional electrode design reduces the total electrode area within each pixel, thereby increasing the aperture ratio while supporting higher resolution through multiple sub-pixels per pixel.
2Measurement precision
If pixel size is reduced to increase resolution, then resolution is improved, but manufacturing precision is worsened
Solution Approach 1:
The patent divides the pixel into multiple vertically stacked sub-pixels (red, green, blue) that can be formed using the same mask pattern. By segmenting the pixel structure vertically rather than horizontally, the mask opening size remains relatively large, making it feasible to achieve the required ±10 μm patterning precision even at high resolutions like 300 ppi.
Solution Approach 2:
The invention moves the sub-pixel differentiation from the horizontal plane to the vertical dimension through stacked structures. This allows the use of larger mask openings for patterning while still achieving high resolution, as the vertical stacking accommodates multiple sub-pixels within the same horizontal footprint that can be patterned with the same mask.
3Measurement precision
If pixel aperture ratio is reduced, then resolution is improved, but brightness is reduced
Solution Approach 1:
The shared transparent electrode structure serves multiple sub-pixels simultaneously, reducing the total electrode area within each pixel and thereby increasing the aperture ratio. This maintains brightness while enabling higher resolution through the vertical stacking of multiple sub-pixels per pixel.
Solution Approach 2:
By stacking sub-pixels vertically, the patent increases the number of sub-pixels per pixel without proportionally increasing the electrode area, as the transparent electrode is shared across multiple vertical layers. This maintains high aperture ratio and brightness while achieving higher resolution.
4Area of moving object
If brightness is increased to compensate for reduced aperture ratio, then aperture ratio is reduced, but device life is shortened
Solution Approach 1:
The shared transparent electrode structure increases aperture ratio, eliminating the need to increase sub-pixel brightness to compensate. This maintains lower, more sustainable brightness levels that extend organic EL device life while achieving high resolution through vertical stacking.
Data Source
AI summary
There are provided a display apparatus that can display an image having higher resolution feeling while solving the problem of patterning precision for sub pixels which is difficult to obtain in production, and a production method thereof. The display apparatus includes a plurality of pixels disposed in two directions within a display surface and each having a sub pixel for emitting red light, two sub pixels for emitting green light, and a sub pixel for emitting blue light, wherein the sub pixel for emitting red light and the sub pixel for emitting blue light are disposed so as to partially overlap each other in one of the two directions, and the two sub pixels for emitting green light are disposed distant from each other in the one direction, wherein for the pixels adjacent to each other in the one direction, the sub pixels for emitting green light are adjacent to each other, and the sub pixel for emitting red light and the sub pixel for emitting blue light are adjacent to each other, and wherein the pixels adjacent to each other in the other of the two directions have the same sub pixel disposition.