Bend Area Planarization Layer Slope for Side Luminance
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Solution Overview
Problem
Display devices with bend areas in the peripheral portion face challenges in achieving high luminance and display quality when viewed from the side view angle direction, resulting in lower luminance compared to the front view angle direction.
Innovation Solution
Incorporating a planarization layer with a first concave portion and a first slope portion in the bend area, where the first slope portion is positioned to reflect light emitted by the emitting layer towards the front viewing angle direction using a first electrode, thereby enhancing luminance in the side viewing angle direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a bend area is included in the peripheral portion of the display area, then the display area can be maximized while the bezel area is minimized, but the display quality and luminance in the side view angle direction deteriorate significantly
Solution Approach 1:
The planarization layer is designed with different local structures: a first concave portion positioned at the subpixel in the bend area and a first slope portion extending from it. This local structural variation enables selective light reflection in the side view angle direction while maintaining normal display functionality in the front view angle direction, thereby improving luminance specifically in the bend area without affecting the overall display area
Solution Approach 2:
The solution introduces a vertical dimension to the planarization layer by creating concave and slope portions, transforming a two-dimensional flat surface into a three-dimensional structured surface. This dimensional change enables the layer to reflect light at specific angles, addressing the luminance issue in the side view angle direction while preserving the maximized display area
2Area of moving object
If a bend area is included in the peripheral portion of the display area, then the display area can be maximized while the bezel area is minimized, but the display quality in the side view angle direction deteriorates
Solution Approach 1:
The planarization layer incorporates a first concave portion and first slope portion specifically positioned in the bend area to address display quality issues. This localized structural modification ensures that light from subpixels in the bend area is reflected toward the front view angle direction, improving display quality in side viewing conditions without compromising the maximized display area
3Ease of operation
If the bend area is viewed in the side view angle direction, then the display area is accessible, but the luminance becomes lower compared to the front view angle direction
Solution Approach 1:
By introducing vertical structures (concave and slope portions) to the planarization layer, the invention creates a three-dimensional light management system. These structures reflect light from the bend area subpixels back toward the front view angle direction, ensuring that even when users view the display from side angles, the luminance remains adequate for comfortable viewing
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 configuration improves the luminance and display quality in the side viewing angle direction of the bend area, addressing the limitations of existing display devices by effectively reflecting light towards the front view angle.
Implementation Method 1
The first slope portion can be located so that light emitted by an emitting layer can be reflected in a front viewing angle direction by a first electrode
Data Source
AI summary
In a display device, a main area and a bend area adjacent to the main area are located in a display area. A first subpixel is located in the bend area. A planarization layer includes a first concave portion located in the first subpixel and a first slope portion located outside the first concave portion. The first slope portion is located so that light emitted by an emitting layer is reflected in a front viewing angle direction by a first electrode. In this manner, luminance in the side viewing angle direction of the bending area is improved.