Display Device Back-Gate Transistor Voltage Management
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Solution Overview
Problem
Organic EL elements often require high voltages for operation, leading to challenges in power management, size reduction, and achieving high color reproducibility, definition, and reliability in display devices.
Innovation Solution
A semiconductor device with specific transistor and capacitor configurations, including back-gated transistors and oxide semiconductors, is used to control the operation of organic EL elements, allowing for interlace driving and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high voltage is applied to drive organic EL elements, then light emission is achieved, but power consumption increases and device size increases due to power source requirements
Solution Approach 1:
The patent implements dynamic voltage control by switching between different power source connections (first power source for high voltage light emission, second power source for low voltage maintenance) based on operational requirements, thereby reducing overall power consumption while maintaining light emission capability
Solution Approach 2:
The patent employs periodic switching between different power supply modes - using the first power source intermittently for voltage boosting when light emission is needed, and the second power source for continuous low-power operation, achieving reduced power consumption through cyclic voltage management
2Illumination intensity
If high voltage is applied to drive organic EL elements, then light emission is achieved, but device size increases due to power source requirements
Solution Approach 1:
The patent merges two power sources into a unified power management system where the first power source (higher voltage) and second power source (lower voltage) work cooperatively through switching circuits, eliminating the need for separate power supply systems and reducing overall device size
Solution Approach 2:
The patent creates a multi-functional power management system where the switching circuitry can selectively connect either power source to the organic EL element based on operational needs, making the power system versatile and reducing the need for dedicated hardware for each voltage level
3Adaptability or versatility
If complex voltage management is implemented for high voltage driving, then organic EL element operation is achieved, but device complexity increases
Solution Approach 1:
The patent segments the voltage management function into distinct modular components - a first power source module, a second power source module, and a switching control module - allowing independent optimization and simplifying the overall complex voltage management architecture
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 the creation of downsized, high-definition display devices with improved color reproducibility and reliability, while reducing power consumption through efficient voltage management.
Implementation Method 1
the first transistor has a back gate; a gate of the first transistor is electrically connected to the first switch; the second switch and the first capacitor are provided between the gate and a source of the first transistor; the back gate of the first transistor is electrically connected to the third switch; the second capacitor is provided between the back gate and the source of the first transistor
Data Source
AI summary
A novel display device is provided. The display device includes a first layer including a driver circuit, a second layer including a plurality of pixel circuits, and a third layer including a plurality of light-emitting elements; the second layer is provided over the first layer; the third layer is provided over the second layer; and a conductive layer is provided between the driver circuit and the plurality of pixel circuits. The driver circuit has a function of controlling operations of the plurality of pixel circuits. One of the plurality of pixel circuits is electrically connected to one of the plurality of light-emitting elements. The pixel circuit has a function of controlling emission luminance of the light-emitting element.