OLED Two-Sided Display Electrode Segmentation
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Solution Overview
Problem
Conventional OLED display devices lack the capability for transparent and two-sided independent display functions simultaneously.
Innovation Solution
The OLED display device features a transparent substrate with a first electrode structure and a second electrode structure, where the first electrodes have a higher light-transmission rate and lower light-reflection rate compared to the second electrodes, allowing for alternating configurations that enable independent display on both sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective electrode is added to enhance display brightness, then the brightness is improved, but the light-transmission rate decreases and transparent display capability is compromised
Solution Approach 1:
The electrode structure is segmented into multiple types (first transparent electrodes, second transparent electrodes, and reflective electrodes) with different optical properties. Each electrode type is positioned at specific locations to serve different functions: first transparent electrodes for high transmittance areas, second transparent electrodes for balanced areas, and reflective electrodes for brightness enhancement areas, thereby resolving the contradiction between brightness and transparency.
Solution Approach 2:
Different electrode structures with distinct optical characteristics are applied to different regions of the display device. The first transparent electrodes are used where high light transmission is needed, reflective electrodes are used where brightness enhancement is needed, and second transparent electrodes are used in alternating patterns. This local differentiation allows simultaneous optimization of both transparency and brightness in different areas.
2Adaptability or versatility
If conventional OLED structure is used, then manufacturing is simple, but transparent and two-sided independent display functions cannot be achieved simultaneously
Solution Approach 1:
The display device is segmented into multiple pixel units, with each pixel unit containing alternating first and second transparent electrodes. This segmentation enables independent control of different regions, allowing one side to display images while the other side remains transparent, thereby achieving two-sided independent display functionality.
Solution Approach 2:
The display functionality is extended from single-sided to two-sided operation by adding electrode structures on both sides of the organic light-emitting layer. The first transparent electrodes and reflective electrodes on one side enable transparent display, while the second transparent electrodes on the other side enable image display, thus adding a dimensional aspect to the display capability.
3Adaptability or versatility
If alternating configuration of first and second electrodes is implemented, then two-sided independent display is enabled, but device complexity increases
Solution Approach 1:
Multiple electrode types (first transparent electrodes, second transparent electrodes, and reflective electrodes) are merged into a unified electrode structure system where they work together. The alternating configuration of first and second transparent electrodes is combined with reflective electrodes to create a coordinated system that achieves two-sided independent display while managing complexity through functional integration.
Solution Approach 2:
The electrode structure is designed with multi-functionality: the same basic electrode pattern serves both transparent display and image display functions depending on which side is activated. The alternating first and second transparent electrodes can be configured to prioritize either transparency or image display, providing universal functionality for different display modes.
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 allows for transparent display of scenes on one side and image display on the other side, with adjustable brightness and reflection rates to achieve two-sided independent display functionality.
Implementation Method 1
After applying an operating voltage between the anode and the cathode, holes are injected from the anode into the organic material layer and electrons are injected from the cathode into the organic material layer. The carriers, i.e., holes and electrons, form hole-electron pairs in the organic material layer. The hole-electron pairs then recombine to emit light.
Implementation Method 2
A light-transmission rate of the first electrodes is higher than a light-transmission rate of the second electrode structure
Implementation Method 3
a light-reflection rate of the second electrodes is higher than a light-reflection rate of the second electrode structure
Data Source
Figure 1~2
Figure 3~4
AI summary
An organic light-emitting diode (OLED) device comprises a transparent substrate (1), a first electrode structure (2), an organic light-emitting layer (3) and a second electrode structure (4). The first electrode structure (2) includes a plurality of first electrodes (21) and a plurality of second electrodes (22) on the transparent substrate (1), a first electrode (21) and a second electrode (22) each corresponding to a subpixel unit, the first electrodes (21) and the second electrodes (22) being arranged in an alternating configuration along at least one of a row direction and a column direction of a pixel unit. The second electrode structure (4) comprises a transparent electrode layer with a planar structure. The organic light-emitting layer (3) is positioned between the first electrode structure (2) and the second electrode structure (4). A light-transmission rate of the first electrodes (21) is higher than that of the second electrode structure (4), a light-reflection rate of the first electrodes (21) is lower than that of the second electrode structure (4), a light-transmission rate of the second electrodes (22) is lower than that of the second electrode structure (4), and a light-reflection rate of the second electrodes (22) is higher than that of the second electrode structure (4).