OLED Pixel Layout and Light Shielding for Private Viewing Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic light emitting electronic devices with private mode panels suffer from reduced light emission areas and non-uniform brightness at side viewing angles due to narrow pixels, which deteriorate viewing angle performance.
Innovation Solution
The solution involves increasing the light emission areas and enhancing brightness uniformity of both wide and narrow pixels by optimizing the pixel structure and light shielding in the private mode panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrow pixels are used to achieve private mode performance, then privacy protection is improved, but viewing angle performance deteriorates
Solution Approach 1:
The display panel is segmented into two types of pixels: narrow pixels for private mode and wide pixels for normal viewing. This segmentation allows each pixel type to be optimized for its specific function, resolving the contradiction between privacy protection and viewing angle performance
Solution Approach 2:
The display dynamically switches between normal mode (all pixels on) and private mode (only narrow pixels on) based on operational requirements. This dynamic operation allows the system to achieve both wide viewing angle and privacy protection at different times
2Reliability
If narrow pixels are operated in normal mode to achieve private mode performance, then privacy protection is improved, but light emission area decreases
Solution Approach 1:
The display is divided into narrow pixels and wide pixels with distinct functions. Wide pixels compensate for the smaller light emission area of narrow pixels by providing additional light output when both are operational
Solution Approach 2:
The operational parameters of pixels are changed based on mode: in normal mode both pixel types operate at full brightness, while in private mode only narrow pixels operate. This parameter adjustment optimizes both privacy performance and light emission area
3Illumination intensity
If wide pixels and narrow pixels are operated together in normal mode, then brightness is improved, but brightness uniformity deteriorates at side viewing angles
Solution Approach 1:
Different regions of the display have different pixel characteristics: narrow pixels provide uniform brightness at side angles, while wide pixels provide higher overall brightness. This local quality differentiation resolves the contradiction between total brightness and brightness uniformity
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 compensates for the loss in light emission and improves brightness uniformity at side viewing angles, enhancing the overall performance of the private mode panel.
Implementation Method 1
Each of the plurality of pixels may include a plurality of organic light emitting elements
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed is a display device including a substrate, a plurality of pixels disposed on the substrate and including a first pixel and a second pixel, a first opaque member located not to overlap a first light emitting area of a first sub-pixel that displays a first color included in the first pixel and to surround a circumference of the first light emitting area, and a second opaque member disposed to overlap at least a portion of a second light emitting area of a second sub-pixel that displays a second color included in the second pixel and to wrap a periphery of the second light emitting area around once by a specific first thickness, the first light emitting area may be an area, in which a first electrode of the first sub-pixel and a first organic light emitting layer of the first sub-pixel contact each other, and the first light emitting area may include at least two divided areas, and the second light emitting area may be an area, in which a second electrode of the second sub-pixel and a second organic light emitting layer of the second sub-pixel contact each other, and the second pixel does not include an opaque member at a portion, at which the second pixel does not overlap the second light emitting area.