OLED Display Substrate Stacked Light-Emitting Units Aperture Ratio
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Solution Overview
Problem
Conventional OLED display devices have a lower aperture ratio due to the need for multiple sub-pixels and driving structures, which limits their resolution and efficiency.
Innovation Solution
The OLED display substrate is designed with two sub-pixels per pixel, where each sub-pixel includes stacked light-emitting units emitting different colors, reducing the number of driving structures and increasing the light-emitting area, thereby enhancing the aperture ratio and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three sub-pixels are arranged side by side in each pixel, then the display can emit red, green and blue light, but the aperture ratio is reduced due to the need for isolation structures and driving structures
Solution Approach 1:
The patent transitions from a planar arrangement of three sub-pixels to a stacked three-dimensional configuration where light-emitting units are arranged vertically. This dimensional change allows multiple color-emitting units to occupy the same footprint area, thereby increasing the aperture ratio while maintaining full color emission capability.
Solution Approach 2:
The patent merges multiple light-emitting units (emitting different colors) into a single stacked structure within one pixel. By combining red, green and blue light-emitting units in a vertical stack, the design reduces the horizontal space required for isolation structures while preserving all color emission functions.
2Adaptability or versatility
If multiple sub-pixels are arranged in each pixel, then the display can emit different colors, but the number of driving structures increases, reducing the light-emitting area
Solution Approach 1:
The patent combines multiple light-emitting units that emit different colors into a single stacked structure controlled by one driving structure. This merging approach allows one driving structure to control multiple color-emitting units, thereby reducing the total number of driving structures and increasing the light-emitting area.
Solution Approach 2:
The patent makes a single driving structure universal by enabling it to control multiple light-emitting units that emit different colors. This multi-functional driving structure eliminates the need for separate driving structures for each sub-pixel, thereby increasing the light-emitting area while maintaining full color emission capability.
3Adaptability or versatility
If three sub-pixels are arranged side by side, then the display can emit different colors, but the resolution is limited due to the occupied area of isolation and driving structures
Solution Approach 1:
The patent uses vertical stacking to arrange multiple light-emitting units in the third dimension, allowing higher resolution to be achieved within the same pixel area. By moving from a two-dimensional planar arrangement to a three-dimensional stacked configuration, the design increases the effective light-emitting area and improves resolution while maintaining color emission capability.
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
This configuration increases the aperture ratio and improves the resolution of the OLED display device by reducing the occupied area of driving structures and increasing the light-emitting area, while maintaining efficient light emission.
Implementation Method 1
Holes provided by the anode and electrons provided by the cathode form excitons on the light-emitting layer. Light with a predetermined wavelength is emitted when the excitons fall into a ground state.
Data Source
AI summary
Provided are an OLED display substrate (100) and an OLED display device, in the field of display device. The OLED display substrate (100) includes a plurality of pixels, and each of the pixels includes two sub-pixels. The two sub-pixels include a first sub-pixel (210) and a second sub-pixel (220). The first sub-pixel (210) includes a first light-emitting unit (211) and a second light-emitting unit (212) that are stacked; the second sub-pixel (220) includes a third light-emitting unit (213); and the first light-emitting unit (211), the second light-emitting unit (212) and the third light-emitting unit (213) are configured to emit lights with different colors. Under the same resolution, the aperture ratio of the OLED display substrate (100) may be increased. Alternatively, under the same size of sub-pixels, the resolution of the OLED display substrate (100) may be increased. Therefore, the brightness uniformity and display effect of the OLED display panel are improved.