OLED Display White Color Shift Reduction via Black Matrix Offset
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Solution Overview
Problem
Organic light emitting display apparatuses experience a white color shift phenomenon when viewed from different angles due to changes in viewing angle, affecting image quality and user experience.
Innovation Solution
The apparatus includes a first substrate, a second substrate with a display unit featuring organic light emitting diodes (OLEDs) and a resonance structure, a black matrix with light blocking elements, and color filters adjacent to the black matrix, where the offset distance between the emission regions and the black matrix elements is adjusted to minimize the side luminance ratio changes with viewing angle, thereby stabilizing the white light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the viewing angle changes, then the side luminance ratio changes, but this causes white color shift phenomenon that degrades image quality
Solution Approach 1:
The patent applies local quality by differentiating the structure and positioning of light blocking elements across different regions of the black matrix. Each light blocking element is specifically positioned to control light from corresponding emission regions, creating localized optical control that maintains consistent color perception across wide viewing angles while preventing white color shift phenomenon
Solution Approach 2:
The light blocking elements in the black matrix serve as intermediaries between the emission regions and the viewer. These elements mediate the light path by selectively blocking light from specific emission regions, thereby controlling the side luminance ratio and preventing color shift while maintaining broad viewing angle adaptability
2Reliability
If light blocking elements are added to control side luminance, then white color shift is reduced, but the device structure becomes more complex
Solution Approach 1:
The patent merges the light blocking function with the existing black matrix structure by integrating light blocking elements directly into the black matrix. This combination achieves color stability and white color shift reduction while avoiding the need for separate complex light blocking components, thereby minimizing additional device complexity
Solution Approach 2:
The black matrix is designed to serve multiple functions simultaneously: it provides the traditional black background, contains light blocking elements for side luminance control, and maintains structural support. This multi-functionality achieves color stability without proportionally increasing device complexity
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 reduces the side luminance ratio changes across different viewing angles, minimizing white light shifts and ensuring consistent image quality regardless of the user's viewing position.
Implementation Method 1
an organic light emitting display apparatus, is a self-emitting display apparatus that electrically excites an organic compound to emit light
Implementation Method 2
a plurality of emission regions in which a plurality of organic light emitting diodes (OLEDs) having a resonance structure are respectively disposed
Implementation Method 3
a black matrix that is disposed at a surface facing the first substrate among surfaces of the second substrate, and having a plurality of light blocking elements disposed to overlap peripheral regions of corresponding emission regions
Implementation Method 4
a plurality of color filters that are disposed adjacent to the black matrix in correspondence with the plurality of emission regions
Data Source
AI summary
An organic light emitting display apparatus wherein a shift of white light caused by a viewing angle is reduced by adjusting an offset distance between one end of a corresponding emission region and one end of the black matrix adjacent to the one end of the corresponding emission region, thereby preventing a white color shift phenomenon at various viewing angles. Accordingly, a certain image is produced regardless of a use environment of a user's viewing angle.