OLED Substrate Transmittance Adjusting Layer for Luminance Uniformity
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Solution Overview
Problem
In OLED displays, the inkjet printing process often results in organic layers with non-uniform thickness, leading to uneven luminance across sub-pixel regions, which affects the overall display quality.
Innovation Solution
An OLED substrate with a transmittance adjusting layer is introduced, positioned on the light exit side of the organic layer, where the transmittance varies to compensate for thickness variations in the organic layer, ensuring uniform luminance by adjusting light transmission based on the layer's thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If inkjet printing is used to form organic layer, then equipment cost is reduced and large-scale production is enabled, but organic layer thickness uniformity deteriorates
Solution Approach 1:
The patent applies local quality by creating a transmittance adjusting layer with spatially varying optical properties. Different regions of the layer have different light transmittance values, allowing compensation for the non-uniform organic layer thickness. The layer transitions from uniform structure to non-uniform structure where each region's transmittance is optimized for its local thickness condition, thereby achieving uniform luminance output despite manufacturing variations.
2Productivity
If inkjet printing is used to form organic layer, then large-size production is enabled, but luminance uniformity deteriorates
Solution Approach 1:
The patent employs parameter changes by systematically varying the transmittance parameter of the adjusting layer across different spatial regions. The transmittance value is changed as a function of position to compensate for thickness variations in the organic layer. This parameter modulation allows the display to maintain uniform luminance characteristics across large areas while preserving the productivity benefits of inkjet printing for large-size production.
3Ease of manufacture
If organic layer with non-uniform thickness is formed, then inkjet printing process is utilized, but luminance uniformity deteriorates
Solution Approach 1:
The transmittance adjusting layer serves as an intermediary element between the non-uniform organic layer and the final light output. This intermediate layer absorbs or transmits light differently in various regions, mediating the effect of organic layer thickness variations. By introducing this intermediary component, the system maintains the manufacturing simplicity of inkjet printing while achieving uniform luminance through the compensating effect of the adjusting layer.
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 transmittance adjusting layer effectively addresses the issue of uneven luminance by optimizing light transmission, resulting in improved luminance uniformity across sub-pixel regions, regardless of the organic layer's thickness distribution.
Implementation Method 1
a transmittance adjusting layer in the sub-pixel region, the transmittance adjusting layer is located on a light exit side of the organic layer such that light emitted from the organic layer passes through the transmittance adjusting layer when the OLED substrate is in operation
Data Source
AI summary
An OLED substrate and a manufacturing method thereof, the OLED substrate includes a substrate, and an OLED device in a sub-pixel region on the substrate. The OLED device includes an organic layer having a non-uniform thickness. The OLED substrate further includes a transmittance adjusting layer in the sub-pixel region. The transmittance of a portion of the transmittance adjusting layer corresponding to a thicker portion of the organic layer is higher than the transmittance of a portion of the transmittance adjusting layer corresponding to a thinner portion of the organic layer. The transmittance adjusting layer is located on a light exit side of the organic layer such that light emitted from the organic layer passes through the transmittance adjusting layer when the OLED substrate is in operation.