Display Backplate With Moving Electrodes for High Ppi OLED
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Solution Overview
Problem
Current OLED display technologies face challenges in achieving high-resolution displays for augmented and virtual reality applications, as they typically have pixel densities below 400 ppi, and the use of white organic light-emitting diodes with color films results in high operating voltage and power consumption.
Innovation Solution
A method for fabricating a display backplate involves forming a channel layer with liquid storage portions and moving electrodes on a substrate, where ink droplets containing light-emitting materials are printed and moved into sub-pixel grooves using applied voltages, enabling the creation of a high pixel density OLED display without the need for color films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If white organic light-emitting diodes are combined with color film design to achieve high resolution, then pixel density is improved, but operating voltage and power consumption increase
Solution Approach 1:
The patent removes the color film component from the display structure, using electrophoretic ink particles that inherently contain color information. This extraction eliminates the need for additional color filtering layers, reducing device complexity and power consumption while maintaining high pixel density through direct color particle positioning in pixel channels.
Solution Approach 2:
The patent changes the state of matter used for color representation from reflected light through color films to suspended colored ink particles. By using electrophoretic particles that can be electrically manipulated, the system achieves color display without the energy-intensive color film structure, resolving the contradiction between high resolution and power consumption.
2Ease of manufacture
If conventional OLED manufacturing is used, then production process is simple, but pixel density remains below 400 ppi
Solution Approach 1:
The patent replaces traditional mechanical photolithography and vapor deposition processes with electrophoretic particle manipulation. Colored ink particles are transported and positioned using electric fields rather than complex mechanical patterning, enabling high pixel density (above 1000 ppi) while maintaining manufacturing simplicity through a single-step particle injection process.
Solution Approach 2:
The patent introduces a fluid dimension by using liquid carrier solutions to transport colored particles to the pixel channels. This liquid-phase delivery method allows particles to be precisely positioned in high-density patterns that would be difficult to achieve with conventional solid-state manufacturing, breaking the pixel density barrier while keeping the process simple.
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 approach allows for the production of OLED displays with pixel densities higher than 1000 ppi, reducing operating voltage and power consumption by eliminating the need for color films and enabling efficient electrical printing of light-emitting layers.
Implementation Method 1
moving the ink droplets into the plurality of sub-pixel grooves by applying a moving voltage to the moving electrodes
Data Source
AI summary
The embodiments of the present disclosure provide a method of fabricating a display backplate. The method of fabricating the display backplate may include forming a channel layer on a surface of a substrate. The channel layer may include a liquid storage portion, a plurality of pixel channels, and a plurality of moving electrodes. Each of the plurality of pixel channels may include a plurality of sub-pixel grooves. The method of fabricating the display backplate may further include printing ink droplets into the liquid storage portion and moving the ink droplets into the plurality of sub-pixel grooves by applying a moving voltage to the moving electrodes.