Subpixel Electrode Segmentation for HMD Display Power Reduction
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Solution Overview
Problem
Head mounted display (HMD) devices face challenges in achieving high resolution due to compact sub-pixel intervals, leading to increased power consumption and the need for precise mask alignment processes, which are costly and inefficient.
Innovation Solution
A display device configuration with a substrate featuring first and second sub-pixels, each with a first and second emission layer, and a third electrode, where the first electrode of the first sub-pixel is larger than the second, and the same voltage is applied to the first and second electrodes in each sub-pixel, eliminating the need for a precise mask and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a white colored emission layer with multiple stacks and color filter is used to achieve different colored light in compact sub-pixels, then high resolution is realized, but power consumption increases
Solution Approach 1:
The emission layer is segmented into multiple independent emission layers (first emission layer, second emission layer, third emission layer), each capable of emitting different colored light. Each emission layer is controlled by its own electrode, allowing selective activation to reduce power consumption while maintaining high resolution through the compact sub-pixel structure.
Solution Approach 2:
Different regions of the display (different sub-pixels) can activate different emission layers based on local requirements. The first electrode pattern is larger than the second electrode pattern, creating local variations in which emission layers are activated, optimizing power consumption while maintaining color accuracy in each sub-pixel region.
2Measurement precision
If different-colored emission layers are patterned by individual sub-pixels using mask to achieve high resolution, then precise color control is realized, but manufacturing complexity and cost increase
Solution Approach 1:
The complex mask alignment process is extracted and eliminated from the manufacturing process. Instead of using masks to pattern different-colored emission layers by individual sub-pixels, the patent uses a simplified approach where multiple emission layers are formed without requiring precise mask alignment, reducing manufacturing complexity while maintaining color precision through the layered structure and selective electrode activation.
Solution Approach 2:
Instead of patterning emission layers by removing material or using masks to define boundaries, the patent inverts the approach by forming complete emission layers and using electrode patterns to selectively activate specific regions. This inversion simplifies the manufacturing process by eliminating the need for complex mask alignment while achieving the same color precision through electrical control.
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 allows for high-resolution display without the need for precise mask alignment, significantly reducing power consumption and enabling efficient operation of the display device.
Implementation Method 1
a first emission layer provided in each of the first sub pixel and the second sub pixel on the first electrode, and configured to emit first colored light
Implementation Method 2
a second emission layer provided on the second electrode, and configured to emit second colored light
Data Source
AI summary
The display device includes a substrate including first and second sub pixels, a first electrode patterned in each of the first and second sub pixels on the substrate, a first emission layer in each of the first and second sub pixels on the first electrode to emit first colored light, a second electrode in each of the first and second sub pixels on the first emission layer, a second emission layer on the second electrode to emit second colored light, and a third electrode on the second emission layer. The first electrode of the first sub pixel is relatively larger than the first electrode of the second sub pixel, the first electrode of the first sub pixel is electrically connected with the second electrode of the first sub pixel, and the first electrode of the second sub pixel is insulated from the second electrode of the second sub pixel.