Organic Light Emitting Display Pixel Structure for Transmittance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for manufacturing organic light emitting display devices face challenges in achieving improved transmittance for external light and simplifying the manufacturing process, particularly in designing pixel structures that balance light emission and transmission efficiently.
Innovation Solution
The proposed method involves a substrate with specific pixel regions divided into light emitting and transmission portions, where the organic light emitting layer patterns are strategically positioned to avoid overlapping with the transmission portions, using a mask structure during deposition to ensure uniformity and efficiency in light emission and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the organic light emitting layer patterns are deposited to cover the entire pixel region, then the light emission is enhanced, but the transmittance of external light through the transmission portions is reduced
Solution Approach 1:
The pixel region is segmented into light emitting portions and transmission portions, with the organic light emitting layer patterns selectively deposited only on the light emitting portions using a mask structure. This segmentation allows the light emitting portions to have high illumination intensity while the transmission portions maintain high transmittance for external light.
Solution Approach 2:
Different regions of the pixel are given different properties: the light emitting portions are covered with organic light emitting layer patterns to enhance light emission, while the transmission portions are left exposed to maintain high transmittance. This local differentiation resolves the contradiction between enhancing light emission and maintaining transmittance.
2Ease of manufacture
If the organic light emitting layer patterns overlap with the transmission portions, then the manufacturing process is simplified, but color shift issues occur and transmittance is reduced
Solution Approach 1:
A mask structure is introduced as an intermediary tool during the deposition process. The mask structure enables selective deposition of organic light emitting layer patterns on light emitting portions while preventing deposition on transmission portions. This intermediary allows precise control without complicating the overall manufacturing process.
3Illumination intensity
If the pixel regions are designed with larger area for light emitting portions, then the light emission is improved, but the area available for transmission is reduced
Solution Approach 1:
The solution transitions from a two-dimensional area trade-off to a three-dimensional spatial arrangement by using vertical stacking and precise lateral positioning. The mask structure enables selective deposition in the lateral dimension, allowing the light emitting portions and transmission portions to coexist without area compromise, as each region receives appropriate treatment based on its spatial location.
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 approach enhances the transmittance of external light through the display device while maintaining effective light emission, preventing color shift issues and simplifying the manufacturing process by optimizing the arrangement and deposition of organic light emitting layer patterns.
Implementation Method 1
a deposition source that contains and heats the deposition material... A deposition material that has been vaporized in the deposition source
Implementation Method 2
A deposition material that has been vaporized in the deposition source and passed through the deposition source nozzle passes through the patterning slits toward a substrate. The deposition is continuously performed while the substrate is moved relative to the organic layer deposition assembly.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An organic light emitting display device includes a substrate having a first width in a first direction and a second width in a second direction, the second width being perpendicular to and smaller than the first width, and pixel regions on the substrate, each of the pixel regions including a first light emitting portion, a second light emitting portion, a third light emitting portion, and a transmission portion arranged along the second direction, each of the first to third light emitting portions extending in the first direction.