Cover Window Light Path Control Structure for Ghost Mura Reduction
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Solution Overview
Problem
Organic light emitting display devices face issues with display non-uniformity and ghost mura due to excessive external light exposure, which affects visibility and increases manufacturing complexity and costs, particularly when attempting to adjust viewing angles for specific applications like vehicle displays.
Innovation Solution
Incorporating a light path control structure within the cover window, comprising light blocking patterns, a refractive index matching layer, and a light transmission part, to adjust the viewing angle and prevent total reflection, thereby reducing ghost mura and manufacturing complexities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate optical film is added to adjust viewing angle, then visibility control is improved, but device thickness and manufacturing complexity increase
Solution Approach 1:
The patent integrates the light path control structure directly into the cover window, merging the functions of the cover window and the optical film into a single component. This eliminates the need for a separate optical film while maintaining viewing angle control functionality, thereby reducing device thickness and manufacturing complexity
Solution Approach 2:
The cover window is designed to perform multiple functions: it serves as both the protective cover and the light path control element. By incorporating light blocking patterns, refractive index matching layers, and light transmission parts, the cover window universally handles both structural protection and optical control functions
2Ease of operation
If light blocking patterns are used to control viewing angle, then visibility range is improved, but total reflection and ghost mura occur
Solution Approach 1:
The patent introduces a refractive index matching layer as an intermediary between the light blocking patterns and the external environment. This intermediate layer has a refractive index that matches both the light blocking patterns and the surrounding medium, preventing total internal reflection and eliminating ghost mura while maintaining viewing angle control
Solution Approach 2:
The light path control structure uses different local properties in different regions: light blocking patterns in some areas to restrict viewing angles, and light transmission parts in other areas to allow light passage. The refractive index matching layer is selectively applied at interfaces where total reflection would occur, addressing the ghost mura problem locally without affecting overall functionality
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 solution effectively adjusts the viewing angle of organic light emitting display devices without adding a separate optical film, minimizing thickness and manufacturing costs while improving display quality by reducing ghost mura and enhancing visibility.
Implementation Method 1
light blocking patterns configured to block light incident upon the cover window at a designated angle or more
Implementation Method 2
a refractive index matching layer configured to cover the light blocking patterns and to prevent the light incident upon the cover window from being totally reflected by the light blocking patterns
Data Source
AI summary
Disclosed are an organic light emitting display device and a method for manufacturing a cover window thereof. The organic light emitting display device includes a display panel configured to display an image, and a cover window located above the display panel. The cover window includes a light path control structure configured to adjust a range of visibility of the image displayed by the display panel and to prevent occurrence of ghost mura.