OLED Pixel Transparent Area Arrangement for Display Transparency
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Solution Overview
Problem
Current OLED display devices face challenges in enhancing transparency and haze characteristics while maintaining a high aperture ratio, as the existing configurations do not effectively optimize the arrangement of emissive and transparent areas.
Innovation Solution
The proposed solution involves a display device configuration with a lower substrate and pixels that include a transparent area for light transmission and multiple emissive areas for light emission, arranged in specific shapes such as 'L' or cross configurations, which alternate and share spaces to minimize the bank layer width and enhance transparency and haze characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture ratio is increased to improve light transmission, then transparency is enhanced, but the area available for emissive areas is reduced, deteriorating display performance
Solution Approach 1:
The pixel is divided into multiple sub-pixels, each containing a transparent area and an emissive area. This segmentation allows light to pass through the transparent areas while maintaining display functionality through the emissive areas, resolving the contradiction between transparency and display performance.
Solution Approach 2:
Different areas within the pixel are assigned different functions: transparent areas for light transmission and emissive areas for light emission. This local differentiation optimizes both transparency and display performance by allowing each region to perform its specialized function effectively.
2Illumination intensity
If the bank layer width is reduced to increase the transparent area, then manufacturing precision is challenged, but transparency can be improved
Solution Approach 1:
Adjacent sub-pixels share common bank layers, which reduces the total width of bank layers required in the pixel structure. This merging approach increases the transparent area while maintaining manufacturability, as the shared bank layers can be formed with standard precision rather than requiring extremely narrow individual bank layers.
3Illumination intensity
If the emissive area is reduced to increase transparent area, then transparency is improved, but the aperture ratio decreases, worsening light emission capability
Solution Approach 1:
The patent arranges transparent and emissive areas in a two-dimensional pattern within the pixel, with transparent areas positioned between emissive areas. This spatial arrangement allows both functions to coexist effectively, with light passing through transparent areas while emissive areas provide sufficient surface area for light emission.
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 effectively enhances transparency by up to 12.4% and maintains the aperture ratio at 30%, improving the overall display performance by optimizing the arrangement of emissive and transparent areas.
Implementation Method 1
a plurality of emissive areas disposed around the one transparent area and defined to emit light with at least three different colors
Data Source
AI summary
A display device includes a lower substrate, and a pixel including sub-pixels having one transparent area defined to transmit light on the lower substrate and a plurality of emissive areas disposed around the one transparent area and defined to emit light with at least three different colors.