Layered Micro-LED Display Layout for Large High-Luminance Panels
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Solution Overview
Problem
Current display apparatuses face limitations in achieving high definition and large diagonal size due to the size of semiconductor substrates, and organic light-emitting diodes (OLEDs) used in these devices have short lifetimes due to sensitivity to environmental factors.
Innovation Solution
A display apparatus design featuring a layered structure with driver circuits and display regions, where each display region includes a light-emitting diode, and the use of a substrate such as glass with low-temperature polysilicon transistors to enhance performance and longevity, allowing for increased diagonal size and improved luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a silicon wafer with diameter exceeding 300 mm is used to manufacture a display apparatus with diagonal size exceeding 20 inches, then the display apparatus can achieve large diagonal size, but it is difficult to prepare such a silicon wafer with current semiconductor manufacturing lines
Solution Approach 1:
The display apparatus is divided into a first display portion and a second display portion, with driver circuits integrated within the display regions. This segmentation allows the use of standard-sized silicon wafers (300mm diameter) to manufacture larger display apparatuses by combining multiple display regions, overcoming the limitation of wafer size while achieving large diagonal sizes.
2Reliability
If organic EL material is used in light-emitting devices to achieve high color reproducibility, then color reproducibility and image clarity are improved, but the lifetime of the display apparatus becomes short due to sensitivity to ultraviolet light and atmospheric components
Solution Approach 1:
A protective layer is provided over the organic EL material in the light-emitting devices. This protective layer acts as a barrier against ultraviolet light and atmospheric components before they can reach and deteriorate the organic EL material, thereby extending the lifetime of the display apparatus while maintaining high color reproducibility.
3Area of stationary object
If the bezel region is reduced or eliminated by providing driver circuits in regions other than the bezel region, then the area of the display portion can be increased, but the driver circuit must be provided in a more complex location
Solution Approach 1:
The driver circuits are merged with the display regions, with each driver circuit provided within its corresponding display region. This integration eliminates the need for separate bezel regions while simplifying the overall structure by combining functional elements, thereby maximizing the display area without excessive complexity.
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 high-definition, large-diagonal-size displays with enhanced luminance and extended lifespan by optimizing the substrate and transistor technology, addressing the limitations of existing OLED-based displays.
Implementation Method 1
Each of the plurality of display regions includes a pixel, and the pixel includes a light-emitting diode
Data Source
AI summary
A display apparatus with high luminance and a long lifetime is provided. The display apparatus includes a first layer and a second layer positioned above the first layer. The first layer includes a substrate and a plurality of driver circuit regions, and the second layer includes a plurality of display regions. The substrate is a glass substrate. Each of the plurality of driver circuit regions includes a driver circuit, and the driver circuit includes a transistor including silicon in a channel formation region. Each of the plurality of display regions includes a pixel, and the pixel includes a light-emitting diode and a transistor including a metal oxide in a channel formation region. Specifically, the light-emitting diode is preferably a micro light-emitting diode. The driver circuit included in one of the plurality of driver circuit regions has a function of driving the display pixel included in one of the plurality of display regions.