Double-Sided Display Panel With Shared Pixel Circuits for Correct Images
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional double-sided display panels display mirror images on both sides, limiting viewers on one side to see correct images, and the design compromises pixel count by using shared thin film transistors.
Innovation Solution
A double-sided display panel design where first and second light emitting units with opposite light emitting directions are electrically connected to the same pixel circuit, allowing them to emit light simultaneously and correctly display images on both sides, with shared driving transistors and wires in the same layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two encapsulated OLED display panels are bonded together, then double-sided display function is achieved, but device thickness increases
Solution Approach 1:
The patent merges two OLED display panels into a single integrated structure with shared thin film transistors and common electrode layers. The first and second OLED panels share the same substrate and transistor layers, eliminating the need for separate encapsulation and bonding processes, thereby achieving double-sided display functionality while reducing overall device thickness.
Solution Approach 2:
The thin film transistors formed in the same lamination layer serve dual functions for controlling both front side and rear side displays. The same transistor layer is used to drive pixels on both sides of the display device, making the transistor system universal and eliminating the need for separate transistor layers for each side.
2Length of stationary object
If thin film transistors are made in the same lamination layer, then device thickness is reduced, but pixel count decreases by at least half
Solution Approach 1:
The patent utilizes the third dimension (vertical stacking) by forming light emitting units in different layers above the same transistor. The first light emitting units and second light emitting units are positioned at different heights above the shared transistor layer, allowing independent pixel control for both front and rear displays without increasing the lateral footprint, thereby maintaining high pixel counts while reducing thickness.
Solution Approach 2:
The structure implements a nested configuration where the second OLED panel is effectively nested within the same transistor layer structure as the first OLED panel. The light emitting units are arranged in overlapping vertical positions, with one set directly above the other, allowing both displays to share the same horizontal space and transistor infrastructure without interfering with each other's pixel density.
3Device complexity
If commonly used thin film transistors are used for both sides, then device complexity is reduced, but image quality deteriorates as only one side displays correct images
Solution Approach 1:
The patent applies local quality by creating distinct light emitting unit configurations for different spatial locations. The first light emitting units are positioned to face one direction while the second light emitting units are positioned to face the opposite direction, with each set optimized for its specific viewing side. This local differentiation ensures that each side receives correct, non-mirrored images while still using the same underlying transistor technology.
Solution Approach 2:
The patent implements inversion by arranging the second light emitting units in a mirrored spatial configuration relative to the first light emitting units. While the transistors remain the same, the light emitting units are positioned and oriented in opposite directions, with the second set facing away from the first set. This inverted arrangement, combined with appropriate pixel mapping, ensures that both sides display correct images rather than mirror images.
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 correct images to be displayed on both sides of the panel, improving viewer experience while maintaining pixel density and reducing thickness through efficient wire and layer design.
Implementation Method 1
a pixel unit includes a first light emitting unit and a second light emitting unit in opposite light emitting directions
Data Source
AI summary
A double-sided display panel and a display device are disclosed. The double-sided display panel includes pixel units defined by scan lines and data lines intersected. The pixel unit includes a first light emitting unit, a second light emitting unit, and a pixel circuit. A first light emitting unit of an ith one of the pixel units counted from left to right and a second light emitting unit of an ith one of the pixel units counted from right to left in each row are electrically connected to the same pixel circuit to achieve the same obverse images displayed on two sides of the double-sided display panel.