OLED Display Substrate Via Hole Offset for Color Separation
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Solution Overview
Problem
OLED display screens face issues with ambient light reflectivity and color separation due to identical via hole positions in the planarization layer, leading to reduced light-emitting efficiency and increased power consumption.
Innovation Solution
The via holes in the planarization layer are arranged such that same colored sub-pixels of different pixels in a pixel repetition unit have different via hole positions, dispersing reflected light into different directions and alleviating color separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer is attached to reduce ambient light reflectivity, then reflectivity is reduced, but light-emitting efficiency decreases and power consumption increases
Solution Approach 1:
The invention extracts and removes the circular polarizer from the display structure, replacing it with a color filter layer that achieves both reflectivity reduction and maintains light-emitting efficiency, thereby eliminating the need for increased power consumption
Solution Approach 2:
The invention changes the optical parameter approach by using a color filter with specific spectral transmission characteristics instead of a circular polarizer, achieving reflectivity control through wavelength-selective filtering rather than polarization, thus preserving light-emitting efficiency
2Ease of manufacture
If via holes in the planarization layer have identical positions for same colored sub-pixels, then manufacturing is simplified, but color separation occurs due to reflected light passing through the color filter
Solution Approach 1:
The invention introduces asymmetry in the via hole positions for same colored sub-pixels within a pixel repetition unit, where at least some via holes are offset from identical positions, thereby disrupting the coherent reflection path and eliminating color separation while maintaining manufacturability
Solution Approach 2:
The invention applies local quality variation by selectively positioning via holes at different locations for same colored sub-pixels in different pixel units, creating localized differences in reflection paths that prevent overall color separation while maintaining global manufacturing consistency
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 arrangement improves light-emitting efficiency by reducing color separation and power consumption, enhancing the overall performance of OLED display screens.
Implementation Method 1
an organic light emitting layer located between the anode and the cathode
Implementation Method 2
a color filter, instead of the circular polarizer, can be used
Implementation Method 3
when the ambient light impinges on and is reflected by the anodes of the OLED display screen
Data Source
AI summary
A display substrate, a manufacturing method thereof and a display device are provided. The display substrate includes: a driver circuit layer, a planarization layer and light-emitting units, each light-emitting unit includes an anode, a cathode and an organic light emitting layer located between the anode and the cathode, and the anode is connected to a driving electrode of the driver circuit layer through a via hole in the planarization layer. The organic light emitting layer includes: at least one pixel repetition unit, each pixel repetition unit includes multiple pixels, and each pixel includes multiple sub-pixels with different colors. Via holes in the planarization layer that correspond to same colored sub-pixels of at least two pixels in the same pixel repetition unit have different via hole positions, the via hole position being a relative position of a projection of a via hole in the planarization layer within corresponding sub-pixel.