Double-Sided LED Display Pixel Layout for Opposite Light Emission
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Solution Overview
Problem
Existing display devices, such as liquid crystal display devices and organic light emitting display devices, face limitations in design, luminance, and response speed due to the presence of backlights or vulnerable organic materials, and the development of double-sided light emitting display devices is hindered by increased process complexity.
Innovation Solution
A double-sided display device using a light emitting diode that emits light in both upper and lower directions, featuring a substrate with sub-pixels having emitting and non-emitting areas, and thin film transistors and light emitting diodes configured to direct light in opposite directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a liquid crystal display device uses a backlight unit, then the display can be achieved, but the design is limited and luminance and response speed are lowered
Solution Approach 1:
The patent extracts and removes the backlight unit from the display device structure, replacing it with self-emissive pixels that generate their own light. This eliminates the limiting factor (backlight unit) while achieving the desired improvement in luminance and response speed through direct light emission from the display elements themselves.
Solution Approach 2:
The patent replaces the mechanical/optical system of a backlight unit with an electrical/optical system where electrical signals directly control light-emitting materials. This substitution enables faster response speeds and higher luminance efficiency by eliminating the need for light modulation through liquid crystals and polarizers.
2Reliability
If an organic light emitting display device is used, then light emission is achieved, but the organic material is vulnerable to moisture and reliability and lifespan are deteriorated
Solution Approach 1:
The patent employs composite material structures combining multiple inorganic layers (such as buffer layers, hole transport layers, electron transport layers, and emission layers made of inorganic materials like oxides, nitrides, or carbides) to create a light-emitting device that is inherently resistant to moisture. This composite inorganic structure eliminates the moisture vulnerability of organic materials while maintaining light-emitting functionality.
3Adaptability or versatility
If one pixel includes a plurality of light emitting devices for double-sided emission, then light emission in multiple directions is achieved, but process difficulty increases
Solution Approach 1:
The patent segments the light-emitting function within a single pixel by incorporating multiple light-emitting materials or structures that emit light in different directions (upward and downward). This segmentation allows double-sided emission to be achieved through a unified pixel structure rather than requiring separate light-emitting devices, thereby simplifying the manufacturing process while maintaining the versatility of multi-directional light emission.
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 proposed solution enables efficient light emission in both upper and lower directions, overcoming the limitations of existing display technologies while simplifying the manufacturing process, thus improving the quality and design flexibility of display devices.
Implementation Method 1
a light emitting diode disposed in the emitting area on the substrate, the light emitting diode including a first p-type electrode electrically connected to the first thin film transistor and a second p-type electrode electrically connected to the second thin film transistor
Data Source
AI summary
A display device includes a substrate and sub-pixels disposed on the substrate. The display device further includes an emitting area and a non-emitting area surrounding the emitting area as well as a first thin film transistor and a second thin film transistor disposed on the substrate in the non-emitting area, and a light emitting diode disposed on the substrate in the emitting area. The light emitting diode includes a first p-type electrode electrically connected to the first thin film transistor and a second p-type electrode electrically connected to the second thin film transistor.