Display Subpixel Light Path Changing Layer for Leakage Current
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Solution Overview
Problem
Current display apparatuses, particularly OLED and QLED devices, face challenges in improving light efficiency and preventing color mixture due to narrow pixel intervals, which lead to leakage current and inefficient light emission.
Innovation Solution
The display apparatus includes a substrate with pixels arranged in a specific configuration, featuring a first subpixel, a second subpixel adjacent to the first, and a third subpixel adjacent to the second, with color filters emitting red, green, and blue light respectively. A light path changing layer with a lower refractive index than the color filters is positioned on the side of the second subpixel, altering the light path to enhance front light efficiency and prevent color mixture by increasing the distance between subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the interval between pixels is narrowed to implement high resolution, then the resolution is improved, but leakage current occurs causing color mixture
Solution Approach 1:
A light path changing layer is introduced as an intermediary component between adjacent subpixels. This layer has a lower refractive index than the color filters and is positioned to contact the side surface of the color filter in the second subpixel, thereby mediating the light path to prevent color mixture while maintaining narrow pixel intervals for high resolution
2Measurement precision
If the interval between pixels is narrowed to implement high resolution, then the resolution is improved, but light efficiency deteriorates
Solution Approach 1:
The light path changing layer is selectively positioned only in specific locations where it can most effectively improve light efficiency - contacting the side surface of the color filter in the second subpixel that is between the first and third subpixels. This localized application optimizes light extraction in critical areas without requiring structural changes across the entire display
3Measurement precision
If the interval between pixels is narrowed, then high resolution is achieved, but it becomes more difficult to change structure for improving light efficiency
Solution Approach 1:
The solution segments the approach to improving light efficiency by treating different subpixels differently. The light path changing layer is specifically applied to the second subpixel (which is between two other subpixels) rather than uniformly to all subpixels, allowing targeted structural modification that is less complex than comprehensive restructuring
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 light efficiency by reducing leakage current and preventing color mixture, resulting in higher color purity and luminance, particularly for green light, while maintaining the advantages of OLED and QLED devices such as thinness, low power consumption, and improved viewing angles.
Implementation Method 1
a light path changing layer having a lower refractive index than that of the color filters is disposed on a side of the second subpixel, and the light path changing layer may contact a first side surface of the second color filter... changing a path of light incident from the first color filter
Data Source
AI summary
A display device including a plurality of pixels disposed on a substrate, in which each pixel includes a first subpixel, a second subpixel adjacent to the first subpixel, and a third subpixel adjacent to the second subpixel, the second subpixel disposed between the first subpixel and the third subpixel; a first color filter disposed in the first subpixel, and configured to emit light having a first color; a second color filter disposed in the second subpixel, and configured to emit light having a second color; and a third color filter disposed in the third subpixel, and configured to emit light having a third color. Further, an upper surface of the second color filter is disposed a greater distance from the substrate than an upper surface of the first color filter, and the first subpixel further includes a first light path changing layer disposed on the first color filter and contacting a first side surface of the second color filter.