Dual-Surface OLED Display Aperture Ratio
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Solution Overview
Problem
Existing display devices face challenges in increasing aperture ratios and transmittance while maintaining brightness and color purity, as the tradeoff between sub-pixel size and transmission portion size limits their performance.
Innovation Solution
A display device design featuring a first and second organic light emitting diode on opposite surfaces of a substrate, with the first diode emitting red, green, and blue light and the second diode emitting a single color, allowing for improved aperture ratios and color purity through optimized bank layer widths and emission structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the sub-pixel becomes larger to increase aperture ratio, then the light emitting area increases, but the transmission portion becomes smaller reducing transmittance
Solution Approach 1:
The pixel is divided into two separate light emitting elements: a first light emitting element in the non-transmission portion and a second light emitting element in the transmission portion. This segmentation allows both the sub-pixel area and transmission portion area to be optimized independently, resolving the tradeoff between aperture ratio and transmittance
Solution Approach 2:
The second light emitting element is placed on the opposite surface of the substrate relative to the first light emitting element. This three-dimensional arrangement allows both elements to emit light in different directions (front and rear), effectively increasing the total light emitting area without compromising the transmission portion area on either surface
2Area of stationary object
If the transmission portion becomes larger to increase transmittance, then external light transmission improves, but the sub-pixel becomes smaller reducing brightness
Solution Approach 1:
The patent combines the emission from two separate light emitting elements (first and second OLEDs on opposite surfaces) to achieve sufficient brightness. This merging of multiple light sources compensates for the reduced area of individual sub-pixels, maintaining overall illumination intensity while allowing larger transmission portions
3Area of moving object
If the aperture ratio is increased to improve brightness, then more light can be emitted, but manufacturing precision becomes more difficult to maintain
Solution Approach 1:
Dividing the pixel into two separate light emitting elements allows the aperture ratio to be distributed across multiple smaller areas. This segmentation makes it easier to control manufacturing precision for each individual element while achieving a high overall aperture ratio for the complete pixel structure
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 brightness, extends lifetime, and improves color purity by increasing the light emitting portion's aperture ratio and reducing haze, while maintaining efficient manufacturing costs.
Implementation Method 1
a first organic light emitting diode disposed over one surface of the first substrate and overlapping with the circuit portion, a second organic light emitting diode disposed over the other surface of the first substrate and overlapping with the transmission portion
Data Source
AI summary
A display device includes a first substrate including a circuit portion and a transmission portion, a first organic light emitting diode disposed over one surface of the first substrate and overlapping with the circuit portion, a second organic light emitting diode disposed over the other surface of the first substrate and overlapping with the transmission portion, and a second substrate facing one surface of the first substrate, in which the first organic light emitting diode and the second organic light emitting diode emit light to the second substrate.