Stacked OLED Pixel Structure for High-Resolution Transparent Displays
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Solution Overview
Problem
Existing OLED display technologies face limitations in achieving high-resolution and high-transmittance due to the limitations of the fine metal mask (FMM) process, which restricts the maximum resolution to 600 ppi, and the challenge of efficiently utilizing the display area for micro-displays like AR and VR applications.
Innovation Solution
A display substrate design with a vertical arrangement of light-emitting elements in each pixel unit, where at least two light-emitting elements are stacked perpendicular to the base, forming a vertical structure that reduces the occupied area and allows for higher resolution and improved transmittance by reducing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light-emitting elements are arranged horizontally in pixel units, then the display area can be utilized, but the resolution is limited to 600 ppi due to FMM process constraints
Solution Approach 1:
The patent transitions from horizontal arrangement of light-emitting elements to vertical stacking in the thickness direction. This dimensional change allows multiple light-emitting elements to be positioned within the same pixel unit area, achieving higher resolution (doubling to 1200 ppi) without being constrained by the FMM process limitations that affect horizontal patterning.
2Manufacturing precision
If more light-emitting elements are arranged in each pixel unit to increase resolution, then the occupied area increases, but the aperture ratio decreases and transmittance is reduced
Solution Approach 1:
By stacking light-emitting elements vertically in the thickness direction rather than arranging them horizontally, the patent increases the number of elements per pixel unit without increasing the planar area occupation. This maintains a high aperture ratio and ensures sufficient light transmittance while achieving doubled resolution.
3Illumination intensity
If the number of light-emitting elements per pixel unit is increased, then the light-emitting luminance improves, but the power consumption increases
Solution Approach 1:
The patent merges multiple light-emitting elements within each pixel unit and shares common electrodes (such as the common cathode) among them. This reduces the total electrode material and structure complexity compared to having separate electrodes for each element, thereby lowering power consumption while maintaining high light-emitting luminance through the combined output of multiple elements.
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 vertical arrangement doubles the resolution and improves light-emitting luminance while reducing power consumption and extending the life of the display substrate, enabling better performance for micro-displays and transparent displays.
Implementation Method 1
a first light-emitting element, a second light-emitting element and a third light-emitting element which are sequentially stacked in a direction away from the base; the first light-emitting element includes a first electrode, a first light-emitting functional layer and a second electrode which are sequentially stacked in the direction away from the base
Data Source
AI summary
An embodiment of the present disclosure provides a display substrate, which includes: a base; a plurality of pixel units; each of the pixel units includes a pixel driving circuit located on the base, and each of the pixel unit further includes a plurality of light-emitting elements located on a side, away from the base, of the pixel driving circuit and connected with the pixel driving circuit, where at least two of the light-emitting elements in each of the pixel units are sequentially stacked in a direction away from the base. Embodiments of the present disclosure further provide a method for manufacturing a display substrate, a method for driving a display substrate, a display panel and a display device.