Organic Light Emitting Device Shielding Patterns
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Solution Overview
Problem
The contrast ratio of organic light emitting devices is reduced due to external light interfering with the light emitted from the panel, which degrades image quality.
Innovation Solution
Incorporating a polarizer with a retarder and a polarizing film that includes shielding patterns, where the area of the shielding pattern closer to the display panel is larger than further away, positioned in the non-emitting areas to absorb or reflect external light, thereby enhancing contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizer is added to shield external light, then contrast ratio is improved, but device complexity increases
Solution Approach 1:
The polarizer is segmented into multiple functional layers: a retarder layer and a polarizing film layer. The polarizing film itself is segmented into a base layer and shielding patterns. This segmentation allows each layer to perform its specific function optimally while contributing to the overall light shielding effect.
Solution Approach 2:
The shielding patterns are strategically positioned only in the non-emitting areas of the display panel, where external light interference is most problematic. The patterns have varying areas - larger areas closer to the display panel and smaller areas farther away - creating local variations in shielding strength where needed most while maintaining transparency in emitting areas.
2Object-affected harmful factors
If shielding patterns with larger area close to display panel are used, then light shielding effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The shielding patterns exhibit asymmetric area distribution - the area of each shielding pattern varies depending on its position relative to the display panel. Patterns closer to the panel have larger areas while those farther away have smaller areas. This asymmetric design optimizes light shielding effectiveness where it is most needed (near the panel) while reducing unnecessary shielding material farther away, thereby managing manufacturing complexity.
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 shielding patterns effectively shield external light, increasing the contrast ratio and improving image quality without reducing the aperture ratio.
Implementation Method 1
The shielding pattern is formed in a non-emitting area of the display panel... light entering from the outside is shielded
Implementation Method 2
the shielding patterns... to absorb or reflect external light, thereby enhancing contrast ratio
Implementation Method 3
a polarizer that is positioned on the display panel and includes a retarder and a polarizing film
Data Source
AI summary
An organic light emitting device includes a display panel, and a polarizer that is positioned on the display panel and includes a retarder and a polarizing film. The polarizing film includes a base layer and shielding patterns positioned inside the base layer. An area of the shielding pattern close to the display panel is larger than an area of the shielding pattern far away from the display panel. The shielding pattern is formed in a non-emitting area of the display panel.