Metal Oxide Transistor Pixel Circuit for Wearable Display Power
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Solution Overview
Problem
Wearable VR or AR devices require high-resolution displays with low power consumption and high luminance, as well as a high aperture ratio to maintain immersion and visibility, especially when used in battery-driven applications with short eye-to-display distances and external light exposure.
Innovation Solution
A display apparatus comprising a matrix of pixels with specific transistor configurations, including a first transistor and multiple second transistors connected in series or parallel, using metal oxide semiconductor layers for low off-state current and efficient current flow, along with a light-emitting element for high luminance and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display panel is increased, then the sense of reality and immersion is improved, but the power consumption increases
Solution Approach 1:
The patent changes the electrical parameters of the transistor by using a metal oxide semiconductor layer with specific characteristics (low off-state current, adequate on-state current) to improve display resolution while controlling power consumption through parameter optimization rather than structural changes
Solution Approach 2:
The patent applies local quality by providing specific transistor structures (first transistor with different configuration than second transistors) in different regions of the pixel circuit to optimize local electrical characteristics for high resolution display while managing power consumption in different circuit areas
2Illumination intensity
If the aperture ratio is increased, then the luminance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the pixel circuit into multiple transistors (first transistor, second transistors) with different configurations, allowing the aperture opening to be optimized for high luminance while the transistor structures are arranged to achieve the desired aperture ratio without excessive manufacturing complexity
Solution Approach 2:
The patent uses metal oxide semiconductor layers that enable achieving high aperture ratios through material property optimization rather than increasing structural complexity in the planar dimension
3Loss of energy
If the off-state current is reduced, then the power consumption is reduced, but the current flow capability deteriorates
Solution Approach 1:
The patent changes the material parameters by using metal oxide semiconductor layers with specifically controlled characteristics to achieve both low off-state current and adequate on-state current flow capability through parameter optimization
Solution Approach 2:
The patent uses metal oxide semiconductor layers as a composite material solution that combines the benefits of low off-state current (energy saving) with sufficient current flow capability (display performance) in a single material system
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 provides a high-resolution, low-power, high-luminance display with a high aperture ratio, enhancing immersion and reliability in wearable VR/AR devices while maintaining efficient manufacturing yields.
Implementation Method 1
The first transistor includes a first semiconductor layer where current flows in the first direction or the second direction. The plurality of second transistors each include a second semiconductor layer where current flows in the first direction or the second direction.
Implementation Method 2
The basic configuration of an organic EL element is a configuration in which a layer containing a light-emitting organic compound is provided between a pair of electrodes. By voltage application to this element, light emission can be obtained from the light-emitting organic compound.
Data Source
AI summary
A novel display apparatus is provided. The display apparatus includes a first wiring, a second wiring, a first transistor, and a plurality of second transistors. The first wiring extends in a first direction and is supplied with a gate signal. The second wiring extends in a second direction intersecting the first direction and is supplied with a source signal. A gate of the first transistor is electrically connected to the first wiring, one of a source and a drain of the first transistor is electrically connected to the second wiring, and the other of the source and the drain of the first transistor is electrically connected to each gate of the plurality of second transistors. The plurality of second transistors are connected in series or in parallel. The first transistor includes a first semiconductor layer in which current flows in the first direction or the second direction.