Transparent Dual-Sided Display Pixel Structure With Reflective Layers
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Solution Overview
Problem
Existing display devices lack the ability to provide transparent functionality when not in use and simultaneous dual-sided image display capabilities, while also ensuring high reliability and brightness.
Innovation Solution
A double-sided emissive transparent display device incorporating top and bottom emissive pixels with reflective layers and inorganic light emitting elements, allowing for independent image display on both surfaces and transparency when inactive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a display device uses organic light emitting materials (OLEDs), then it can provide flexible display functionality, but it has limited reliability and shorter lifetime compared to inorganic materials
Solution Approach 1:
The patent changes the material parameter from organic to inorganic light emitting elements, fundamentally altering the material composition to achieve higher reliability and lifetime while maintaining display functionality through careful design of the inorganic LED structure and integration architecture
2Adaptability or versatility
If a display device implements dual-sided emissive pixels with reflective layers, then it can display independent information on both surfaces, but it increases device structural complexity
Solution Approach 1:
The display device is segmented into two independent emissive systems: a top emissive pixel with bottom reflective layer and a bottom emissive pixel with top reflective layer. Each pixel type is designed independently with dedicated light emitting elements and reflective layers, allowing separate control and simplifying the overall design by avoiding complex multi-layer integration
Solution Approach 2:
The patent adds a vertical dimension to the display by implementing emissive pixels on both the front and back surfaces of the substrate. This dimensional expansion enables dual-sided display functionality without requiring complex lateral integration, as each surface operates independently with its own pixel structure
3Illumination intensity
If a display device uses inorganic light emitting elements (LEDs), then it achieves high brightness and long lifetime, but it requires precise manufacturing control
Solution Approach 1:
The patent changes the light emitting material parameter to inorganic LEDs, which inherently provide higher brightness and efficiency. The manufacturing precision challenge is addressed by optimizing the LED structure design and integration process to work effectively with inorganic material properties
4Adaptability or versatility
If a display device implements transparency when not in use, then it allows background visibility, but it requires specialized transparent pixel structures
Solution Approach 1:
The display device implements dynamic functionality by switching between transparent and emissive states. When not in use, the pixel structures remain transparent to allow background visibility; when activated, the light emitting elements emit light to provide display functionality. This dynamic state change is achieved through controlled activation of the LED elements without requiring permanent structural modifications
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
Enables transparent operation when not in use and provides high-brightness, reliable dual-sided image display with independent information on each surface.
Implementation Method 1
a bottom reflective layer that is disposed under the first light emitting element to overlap the first light emitting element
Implementation Method 2
a top reflective layer that is disposed on the second light emitting element to overlap the second light emitting element
Implementation Method 3
when the LEDs are applied to a double-sided emissive transparent display device, it is possible to display a high-brightness image
Data Source
AI summary
A display device includes a first pixel that emits light toward an upper side, a second pixel that emits light toward a lower side, a plurality of lines and a pad electrode. The first pixel includes a first light emitting element, a first pixel circuit connected to the first light emitting element and some of the plurality of lines and a bottom reflective layer that is under the first light emitting element to overlap the first light emitting element and has a greater size than the first light emitting element. The second pixel includes a second light emitting element, a second pixel circuit connected to the second light emitting element and the others of the plurality of lines, and a top reflective layer that on the second light emitting element to overlap the second light emitting element and has a greater size than the second light emitting element.