Dual-Sided Display Device with Planar Transistor Configuration
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Solution Overview
Problem
Conventional dual display devices face challenges in reducing thickness and increasing opening ratio due to the placement of light emitting layers on both surfaces, which affects their ability to display images simultaneously on both sides effectively.
Innovation Solution
The implementation of transistors disposed at the same level between light emitting structures allows for a thinner design and higher opening ratio, enabling simultaneous dual-sided emission of images by electrically connecting each light emitting structure to its respective transistor, thereby optimizing the display device's thickness and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light emitting layers are disposed on both lower and upper surfaces to create a dual display device, then the device can display images on both sides, but the thickness of the device increases
Solution Approach 1:
The patent transitions from a conventional stacked configuration to a planar configuration where transistors are disposed at the same level between light emitting structures. This dimensional reorganization allows light emitting layers to be positioned on both upper and lower surfaces without increasing vertical thickness, as the transistors no longer occupy vertical space between the surfaces.
2Adaptability or versatility
If light emitting layers are disposed on both surfaces of the display device, then dual-sided emission is achieved, but the opening ratio of the device is reduced
Solution Approach 1:
The patent segments the device into distinct display regions and transparent regions. By placing transistors at the same level in non-display areas or behind the display surfaces, the light emitting layers can cover larger areas of the front and rear surfaces without being blocked by vertically-stacked transistor structures, thereby increasing the opening ratio while maintaining dual-sided emission capability.
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
This configuration reduces the overall thickness of the display device and enhances the opening ratio, enabling it to display the same or different images on both sides simultaneously, improving its efficiency and functionality as a double-sided emission display device.
Implementation Method 1
the first light emitting structure may include a first electrode on the first substrate, a first light emitting layer on the first electrode, and a second electrode on the first light emitting layer
Implementation Method 2
light that is emitted from the first light emitting layer may be reflected from the second electrode, and may transmit the first electrode
Implementation Method 3
light that is emitted from the first light emitting layer may be reflected from the second electrode, and may transmit the first electrode
Implementation Method 4
the second light emitting structure may include a third electrode on the first and second transistors, a second light emitting layer on the third electrode, and a fourth electrode on the second light emitting layer
Implementation Method 5
light that is emitted from the second light emitting layer may be reflected from the third electrode, and may transmit the fourth electrode
Implementation Method 6
light that is emitted from the second light emitting layer may be reflected from the third electrode, and may transmit the fourth electrode
Data Source
AI summary
A display device includes a first substrate, a first light emitting structure, a first transistor, a second transistor, a second light emitting structure, and a second substrate. The first light emitting structure is disposed on the first substrate. The first transistor is disposed on the first light emitting structure, and electrically connected to the first light emitting structure. The second transistor is disposed on the same level with the first transistor. The second light emitting structure is disposed on the first and second transistors, and electrically connected to the second transistor. The second substrate is disposed on the second light emitting structure, and opposite to the first substrate.