Pixel Circuit Layout for High-Luminance Low-Power AR/VR Displays
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Solution Overview
Problem
Display devices, particularly those used in augmented reality (AR) and virtual reality (VR) applications, suffer from issues such as low resolution, low luminance, high power consumption, wide bezels, and large size, which diminish the sense of immersion and realism.
Innovation Solution
A display device with a pixel configuration that includes a light-emitting device, multiple transistors, and capacitors, utilizing metal oxide semiconductors in the channel formation region, and a back gate structure to enhance pixel performance, allowing for high-resolution, high-luminance, low-power consumption, and narrow bezel designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a display device is designed with high resolution and high luminance for AR/VR applications, then pixel density and image quality are improved, but power consumption increases
Solution Approach 1:
The pixel circuit is divided into multiple functional blocks: first and second transistors for voltage generation, third and fourth transistors for signal control, and first and second capacitors for voltage storage. This segmentation allows independent optimization of each component's contribution to luminance versus power consumption, enabling high luminance output while managing energy usage through controlled voltage application to the light-emitting device.
2Illumination intensity
If the display device uses multiple transistors and capacitors per pixel to achieve high luminance, then image quality improves, but device complexity increases
Solution Approach 1:
The pixel circuit components are designed to serve multiple functions: the first and second capacitors provide both voltage storage for luminance enhancement and signal retention between refresh cycles. The first and second transistors function as both voltage generation elements and switches for controlling current to the light-emitting device. This multi-functionality reduces the net increase in complexity while achieving high luminance output.
3Measurement precision
If the display device achieves high resolution with minute pixels, then pixel density increases, but manufacturing precision requirements become more stringent
Solution Approach 1:
The patent employs oxide semiconductor materials with specifically controlled composition ratios (indium:gallium proportion) and crystal structure parameters to achieve high field-effect mobility while maintaining stable transistor characteristics. This parameter optimization allows for smaller transistor dimensions with reduced variability, enabling high pixel density (1000-7000 ppi) while managing manufacturing precision requirements through material property control rather than solely relying on dimensional precision.
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 solution enables a display device with high resolution, high luminance, low power consumption, narrow bezel, and compact size, improving the immersion and realism of AR and VR experiences.
Implementation Method 1
utilizing a metal oxide channel formation region. This configuration allows for enhanced voltage generation and supply to light-emitting devices
Data Source
AI summary
A display device with high luminance is provided. A pixel includes a light-emitting device, a first transistor, a second transistor, a third transistor, a fourth transistor, a first capacitor, and a second capacitor. One electrode of the light-emitting device is electrically connected to one of a source and a drain of the first transistor. A gate of the first transistor is electrically connected to one electrode of the first capacitor and one of a source and a drain of the second transistor. The other of the source and the drain of the first transistor is electrically connected to one electrode of the second capacitor. One electrode of the second capacitor is electrically connected to a first wiring having a function of supplying a first potential. The other electrode of the second capacitor is electrically connected to the other electrode of the first capacitor, one of a source and a drain of the third transistor, and one of a source and a drain of the fourth transistor.