OLED Display Panel Sub-Pixel Geometry for Resolution and Aperture Ratio
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Solution Overview
Problem
The manufacture of organic light emitting diode (OLED) display panels is limited by the opening size of the fine metal mask and the precision of the evaporation process, making it difficult to achieve high resolution while maintaining a high aperture ratio of sub-pixels.
Innovation Solution
A display panel design featuring a plurality of pixels arranged in an array, each pixel comprising three sub-pixels with light-emitting zones of different colors, where the light-emitting zones are arranged in a triangular pattern with one side parallel to the display direction, optimizing the shape and arrangement of light-emitting zones to increase resolution and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the opening size of the fine metal mask is reduced to achieve high resolution, then the resolution is improved, but the aperture ratio of sub-pixels deteriorates
Solution Approach 1:
The pixel unit is divided into three distinct sub-pixels (first, second, and third sub-pixels) with different light-emitting zones emitting different colors. Each sub-pixel's light-emitting zone is independently shaped and positioned, allowing optimized light emission areas while maintaining overall pixel density for high resolution display
Solution Approach 2:
The light-emitting zones of the sub-pixels are designed with asymmetric shapes and different areas. Specifically, the first light-emitting zone has a first area, the second light-emitting zone has a second area, and the third light-emitting zone has a third area, where these areas are deliberately made different to optimize the aperture ratio while achieving high resolution
2Measurement precision
If the precision of the evaporation process is increased to achieve high resolution, then the resolution is improved, but the manufacturing complexity and difficulty increase
Solution Approach 1:
Different regions of the pixel unit (i.e., different sub-pixels) are designed with different local characteristics. Each sub-pixel has a specifically designed light-emitting zone shape and area tailored to its color emission requirements, allowing optimized performance without requiring uniformly ultra-precise manufacturing across the entire display panel
3Illumination intensity
If the aperture ratio of sub-pixel is increased to improve brightness, then the brightness is improved, but the resolution deteriorates
Solution Approach 1:
The patent optimizes the vertical arrangement and spatial positioning of the three light-emitting zones within the pixel unit. By carefully designing the positions and shapes of the light-emitting zones in different dimensions, the patent achieves high aperture ratio for brightness while maintaining high resolution through efficient space utilization
Data Source
AI summary
A display panel, including: a plurality of pixels arranged in an array in a first direction and a second direction intersecting the first direction, each pixel including: a first sub-pixel having a first light-emitting zone configured to emit light of a first color; a second sub-pixel having a second light-emitting zone configured to emit light of a second color; and a third sub-pixel having a third light-emitting zone configured to emit light of a third color, wherein the plurality of pixels include a first pixel, the first light-emitting zone of the first pixel has a substantially polygonal shape, the substantially polygonal shape including: a first side substantially parallel to one side of the second light-emitting zone of the first pixel, and the one side of the second light-emitting zone of the first pixel being opposite to the first light-emitting zone; and a second side substantially parallel to one side of the third light-emitting zone of the first pixel, and the one side of the third light-emitting zone of the first pixel being opposite to the first light-emitting zone.