Narrow Viewing Angle Display via Light-Blocking Pattern and Pixel Lens
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Solution Overview
Problem
Display apparatuses face challenges in reducing viewing angles without compromising central luminance, often resulting in increased thickness due to light control films that restrict light travel direction.
Innovation Solution
A display apparatus design featuring a device substrate with a bank insulating layer, light-emitting device, and a light-blocking pattern with strategically positioned openings, where the light-blocking pattern includes a metal and is covered by a touch structure, allowing for restricted light travel while maintaining central luminance through pixel lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light control film is attached to the display panel to restrict the travelling direction of light, then the viewing angle is reduced, but the overall thickness is increased and the central luminance is decreased
Solution Approach 1:
The patent removes the light control film from the display structure and replaces it with a light-blocking pattern formed directly on the bank insulating layer. This extraction eliminates the need for an additional film layer, thereby reducing overall thickness while maintaining the light direction control function through the patterned blocking structure
Solution Approach 2:
The light-blocking pattern is integrated directly into the bank insulating layer structure, merging the light control function with the existing pixel structure. This integration eliminates the need for a separate light control film, reducing thickness while maintaining viewing angle control
2Object-affected harmful factors
If a light control film is attached to the display panel to restrict the travelling direction of light, then the viewing angle is reduced, but the central luminance of each pixel area is decreased
Solution Approach 1:
The light-blocking pattern is designed with local variations in transparency and blocking density. The pattern includes transparent regions that allow maximum light transmission for central luminance and blocking regions that restrict light direction for viewing angle control. This local differentiation enables simultaneous optimization of both central luminance and viewing angle restriction
Solution Approach 2:
The light control function is segmented into multiple discrete light-blocking patterns rather than using a continuous film. This segmentation allows selective blocking of light in specific directions while preserving light transmission in other directions, thereby maintaining central luminance while achieving viewing angle control
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 solution effectively restricts the viewing angle of light emitted from each pixel area without increasing the overall thickness, thereby enhancing image privacy while maintaining high central luminance and efficiency.
Implementation Method 1
A first pixel lens is disposed on the first opening of the light-blocking pattern. The first pixel lens has a horizontal width larger than the first emission region.
Data Source
AI summary
A display apparatus having a narrow viewing angle is provided. The display apparatus may include a device substrate including a first pixel area; a bank insulating layer on the device substrate, the bank insulating layer defining a first emission region in the first pixel area; a light-emitting device including a lower electrode, a light-emitting layer and an upper electrode, which are sequentially stacked on the first emission region; a light-blocking pattern on the bank insulating layer, the light-blocking pattern including a first opening disposed on the light-emitting device; and a first pixel lens on the first opening of the light-blocking pattern, the first pixel lens having a horizontal width larger than the first emission region, wherein a horizontal width of the first opening is proportional to a vertical distance between the light-emitting layer and the light-blocking pattern. Thus, the central luminance of the pixel area may be improved.