Transparent Dual-Sided Display Pixels With Reflective Light Extraction
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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 transparent operation and distinct image display on both surfaces.
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 suffers from limited reliability and shorter lifetime
Solution Approach 1:
The patent changes the material parameter from organic to inorganic light emitting elements, which fundamentally alters the chemical stability and operational characteristics, resulting in improved reliability and extended display lifetime while maintaining the light emitting function
Solution Approach 2:
The patent employs a composite structure combining inorganic light emitting elements with transparent electrode materials and reflective layers, creating a multi-material system that leverages the advantages of each material to achieve both reliability and transparency
2Adaptability or versatility
If a display device is designed to be transparent, then it allows background visibility, but it cannot provide effective image display when not in use
Solution Approach 1:
The patent implements a dynamic display system where the transparency and display states are controllable through pixel circuit control, allowing the display to switch between transparent mode (when not in use) and active display mode (when information needs to be shown), thus providing adaptability without permanent loss of function
Solution Approach 2:
The patent creates a multi-functional display device that can operate in both transparent mode and active display mode, making it adaptable to different usage scenarios and eliminating the trade-off between transparency and display functionality
3Adaptability or versatility
If a display device displays images on both front and back surfaces, then it provides dual-sided information display, but it increases device complexity
Solution Approach 1:
The patent divides the display into separate top and bottom pixel regions, each with dedicated light emitting elements and control circuits, allowing independent control of front and back surface displays while maintaining a relatively simple overall structure through modular segmentation
Solution Approach 2:
The patent extends the display functionality from a single surface to dual surfaces by adding the depth dimension, with top light emitting elements for front surface display and bottom light emitting elements for back surface display, achieving dual-sided capability without proportionally increasing lateral complexity
4Reliability
If inorganic light emitting elements are used, then reliability and brightness are improved, but manufacturing complexity increases compared to organic materials
Solution Approach 1:
The patent changes the material parameter from organic to inorganic light emitting elements, which fundamentally alters the chemical stability and operational characteristics, resulting in improved reliability and extended display lifetime while maintaining the light emitting function
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 viewing when not in use and provides high-brightness, reliable dual-sided image display with improved reliability and efficiency.
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
LEDs are made of an inorganic material instead of an organic material, and therefore have excellent reliability and a longer lifetime than LCDs or OLEDs
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.