OLED Microdisplay Sub-Block Integration for High Pixel Density
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Solution Overview
Problem
Conventional methods for producing active-matrix OLED microdisplays are limited in achieving high resolution and large panel sizes required for virtual reality headsets, as they face challenges with pixel miniaturization and resolution due to the low mobility of TFT devices and limitations in lithography equipment, which restricts pixel density to around 600 ppi and panel size to less than 50 mm per side.
Innovation Solution
A method involving a single crystal substrate with a sub-pixel driving array, anisotropic conductive film connections, and a high pixel per inch arrangement using a single reticle to define the pixel array and wiring pads, enabling a resolution of at least 2,000 pixels per inch and a panel size of at least 35 mm per side, while minimizing the burden and cost of sub-block design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lithography equipment and TFT devices are used, then manufacturing processes are simpler and costs are lower, but pixel density is limited to around 600 ppi and panel size is limited to less than 50 mm per side
Solution Approach 1:
The display panel is divided into multiple sub-blocks, each containing a portion of the pixel array and associated driving circuits. These sub-blocks are then integrated together to form the complete high-resolution display, enabling pixel densities exceeding 600 ppi while managing manufacturing complexity through modular processing
Solution Approach 2:
The patent extends the display panel dimensions beyond conventional limits by implementing a panel size of at least 50 mm per side while maintaining high pixel density. This is achieved through advanced lithography techniques that enable precise patterning at smaller feature sizes, effectively adding resolution in both horizontal and vertical dimensions simultaneously
2Manufacturing precision
If pixel size is reduced to increase pixel density, then resolution improves, but TFT device mobility limitations and lithography equipment limitations prevent achieving high resolution and large panel sizes
Solution Approach 1:
The patent changes critical manufacturing parameters including lithography wavelength and processing conditions to enable precise patterning of miniaturized pixels. By optimizing these parameters, the process achieves the necessary feature sizes for high pixel density while remaining manufacturable, overcoming both TFT mobility and lithography equipment limitations
3Area of stationary object
If panel size is increased to support virtual reality applications, then immersive experience improves, but conventional production methods cannot achieve both large size and high resolution
Solution Approach 1:
The large panel is divided into multiple manageable sub-blocks that can be processed using conventional lithography equipment. These sub-blocks are then precisely aligned and integrated to form the complete large-area high-resolution display, enabling panel sizes of at least 50 mm per side while maintaining pixel densities above 600 ppi
Solution Approach 2:
The manufacturing process is designed to be universally applicable to both small and large panel sizes by using modular sub-block processing. The same fabrication techniques and equipment can produce various panel dimensions, making the process adaptable to different virtual reality headset requirements while consistently achieving high resolution
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 microdisplays with significantly higher pixel density and larger panel sizes, overcoming the limitations of conventional technologies and achieving the necessary resolution and size for immersive virtual reality applications.
Implementation Method 1
ACFs are widely used in flat panel display technology as the interconnect between a circuit element and display elements. These films typically have low or no conductivity in the X-Y plane that typically has large dimensions compared to the thickness but have high conductivity along the third axis, often labeled the Z-axis.
Implementation Method 2
The OLED is a self-emitting display device in which electrons and holes injected into organic material through an anode and a cathode are recombined to generate excitons, and light with a certain wavelength is emitted by the generated excitons.
Data Source
AI summary
A large area active-matrix organic light-emitting diode microdisplay and method for fabricating the same is provided which includes a panel having resolution of greater than 2,000 pixels per inch and a size of 1.4 or more inches for supporting the needs of virtual reality and augmented reality application.