Subpixel Light Emitting Layer Segmentation for HMD Power Reduction
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Solution Overview
Problem
Head-mounted displays face challenges in precisely forming light emitting layers of different colors due to small pixel intervals, leading to high power consumption and the need for precise mask manufacturing and alignment processes.
Innovation Solution
A display device design where the first and second light emitting layers are provided in specific subpixels without using a mask, with the second light emitting layer covering the entire surface of subpixels, and the second electrode is cut off between subpixels, allowing for easy connection to power supply lines, eliminating the need for precise mask alignment and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light emitting layers are provided in each subpixel to achieve different colors, then color accuracy is improved, but power consumption increases
Solution Approach 1:
The display device segments the light emitting layers across different subpixels rather than stacking multiple layers in each subpixel. Specifically, first light emitting layers emitting first color light are provided in first and second subpixels, while second light emitting layers emitting second color light are provided in third and fourth subpixels. This segmentation allows color differentiation without requiring multiple light emitting layers in each individual subpixel, thereby reducing power consumption while maintaining color accuracy.
2Manufacturing precision
If light emitting layers are precisely formed by subpixel using mask, then manufacturing precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention segments the formation of light emitting layers by subpixel type rather than by individual subpixel. First light emitting layers are formed across first and second subpixels, and second light emitting layers are formed across third and fourth subpixels. This segmentation eliminates the need for precise mask alignment for each individual subpixel, reducing manufacturing complexity while maintaining sufficient precision for high resolution displays.
Solution Approach 2:
The invention applies a universal approach where light emitting layers of the same type are formed across multiple subpixels using the same process conditions. First light emitting layers are uniformly formed in first and second subpixels, and second light emitting layers are uniformly formed in third and fourth subpixels. This universal formation process simplifies manufacturing by reducing the number of different mask alignment operations required.
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 solution allows for the reduction of power consumption and eliminates the need for precise mask manufacturing and alignment, while maintaining high resolution and color accuracy in head-mounted displays.
Implementation Method 1
a first light emitting layer that is provided on the first electrode and emits light of a first color
Implementation Method 2
a second light emitting layer that is provided on the second electrode and emits light of a second color
Data Source
AI summary
A display device can include a first subpixel and a second subpixel disposed on a substrate; a first electrode disposed in each of the first subpixel and the second subpixel; a first light emitting layer disposed on the first electrode, the first light emitting layer being configured to emit light of a first color; a second electrode disposed on the first light emitting layer; a second light emitting layer disposed on the second electrode, the second light emitting layer being configured to emit light of a second color; and a third electrode disposed on the second light emitting layer, in which the first light emitting layer and the second electrode are both included in the first subpixel, and the first light emitting layer and the second electrode are both absent from the second subpixel.