Transparent Electrode Linking TFT to Transmissive OLED Anode
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Solution Overview
Problem
Display devices face challenges in achieving high transmittance and luminous efficiency in light-transmissive areas while accommodating cameras or sensors within the display area without compromising image display performance.
Innovation Solution
A display device design featuring a substrate with non-transmissive and transmissive areas, where a thin film transistor in the non-transmissive area drives a second light emitting element in the transmissive area, and a transparent electrode connects the transistor to the second anode electrode, allowing for improved transmittance and luminous efficiency through a light extraction layer in the transmissive area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a camera or sensor is disposed within the display area, then the space occupied by the camera or sensor is reduced and the screen size is maximized, but the transmittance and luminous efficiency in the light-transmissive area deteriorate
Solution Approach 1:
The display area is segmented into non-transmissive areas (for displaying images) and transmissive areas (for light transmission to cameras/sensors). This segmentation allows different regions to serve different functions simultaneously, enabling the camera/sensor to be disposed within the display area while maintaining display performance in non-transmissive areas and light transmission in transmissive areas.
Solution Approach 2:
Different regions of the display panel are assigned different optical properties: non-transmissive areas have properties optimized for light emission and display, while transmissive areas have properties optimized for light transmission. This local differentiation allows the system to achieve both high screen utilization and adequate transmittance in specific regions.
2Area of stationary object
If components such as camera and sensor are disposed within the display area, then the space occupation is reduced, but the image display performance and component performance are affected
Solution Approach 1:
The display panel is divided into non-transmissive areas for image display and transmissive areas for sensor operation. This spatial segmentation ensures that image display components and sensor components do not interfere with each other, allowing both to operate at optimal performance levels within the same display area.
Solution Approach 2:
A transparent electrode is introduced as an intermediary component to electrically connect the thin film transistor (disposed in non-transmissive area) to the second light emitting element (disposed in transmissive area). This intermediary connection allows the driving circuit to control the light emitting element without requiring direct adjacency, thus separating the functional requirements of driving electronics and light emission.
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
Enhances overall transmittance and maintains image quality by allowing light to travel through the emission area, enabling effective detection by cameras or sensors while ensuring efficient light emission in the display area.
Implementation Method 1
a second light emitting element disposed in the transmissive area... the thin film transistor can be electrically connected to the second anode electrode of the second light emitting element
Implementation Method 2
the thin film transistor can be electrically connected to the second anode electrode of the second light emitting element through a transparent electrode
Data Source
AI summary
A display device includes a substrate including a non-transmissive area and a transmissive area, where the non-transmissive area has a first emission area, and the transmissive area has a second emission area. The display device further includes a first light emitting element disposed in the non-transmissive area and including a first anode electrode, a second light emitting element disposed in the transmissive area and including a second anode electrode, a thin film transistor disposed in the non-transmissive area and configured to drive at least the second light emitting element, and a transparent electrode electrically connecting the thin film transistor to the second anode electrode of the second light emitting element. Further, the structures of the first anode electrode and the second anode electrode are different from each other.