OLED Blue Pixel Light Shielding for Color Shift
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Solution Overview
Problem
Organic light emitting display devices experience color shift issues when the viewing angle changes, particularly due to the dominance of shorter wavelength light components, leading to unwanted blue tinting.
Innovation Solution
Incorporating a light shielding pattern or diffusion pattern on the window of the display device adjacent to or surrounding specific pixels, such as the blue pixel, to selectively shield or scatter light, thereby reducing color shift across different viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display panel without additional light control structures is used, then the device structure remains simple, but color shift occurs when viewing angle changes due to dominance of shorter wavelength light components
Solution Approach 1:
A light shielding pattern is introduced as an intermediary element between the light source (pixels) and the viewer. This pattern selectively blocks shorter wavelength light components that cause blue shift when viewed at oblique angles, thereby compensating for color shift without requiring changes to the pixel structure itself
Solution Approach 2:
The light shielding pattern is positioned specifically adjacent to the blue pixel (third pixel with shortest wavelength) rather than uniformly across all pixels. This localized approach addresses the specific color shift problem of blue pixels while maintaining simplicity and avoiding unnecessary complexity in other parts of the display
2Reliability
If a light shielding pattern is added adjacent to blue pixels, then color shift is reduced by blocking shorter wavelength light, but the device structure becomes more complex
Solution Approach 1:
The light shielding pattern is applied locally only where needed (adjacent to blue pixels) rather than uniformly across the entire display. This targeted approach provides effective color correction while minimizing the increase in structural complexity
Solution Approach 2:
The light shielding pattern is designed to selectively block shorter wavelength (blue) light components while allowing longer wavelength light to pass through. This wavelength-selective shielding compensates for the blue shift effect and maintains color accuracy across different viewing angles
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
The light shielding or diffusion patterns effectively reduce color shift by controlling the emission and scattering of light, maintaining color accuracy even when the viewing angle deviates from the normal position, thus compensating for blue shift and enhancing color stability.
Implementation Method 1
a light shielding pattern on the window, the light shielding pattern being adjacent to an outline of the third pixel
Implementation Method 2
a diffusion pattern on the window, the diffusion pattern being adjacent to an outline of the third pixel
Data Source
AI summary
An organic light emitting display device includes an organic light emitting display panel including first to third pixels that emit light of different colors, a wavelength of a color light emitted from the third pixel being shorter than wavelengths of color lights emitted from the first and second pixels, a window on an upper portion of the display panel, and a light shielding pattern on the window, the light shielding pattern being adjacent to an outline of the third pixel.