OLED Light-Shielding Patterns Prevent Pixel Leakage
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Solution Overview
Problem
Organic light emitting display devices suffer from light leakage at the periphery of pixel areas due to reflection of external or adjacent pixel area light by metal patterns, leading to distortion of color coordinates, deterioration in contrast ratio, and reduced image quality, which is exacerbated by the use of polarizing films or black matrices that increase manufacturing costs and complexity.
Innovation Solution
The implementation of light-shielding patterns spaced apart from gate lines and overlapping data lines at the periphery of pixel areas, which are integrated into the manufacturing process without the need for separate polarizing films or black matrices, effectively preventing light leakage by reflecting external or adjacent light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing film is adhered to the display surface to prevent light leakage, then light leakage is reduced, but brightness deteriorates and manufacturing cost increases
Solution Approach 1:
The patent extracts and removes the polarizing film from the display structure, replacing it with light-shielding patterns formed by metal patterns that define pixel areas. This eliminates the need for the polarizing film while maintaining light leakage prevention through the light-shielding properties of the metal patterns at the pixel periphery.
Solution Approach 2:
The patent uses the existing metal patterns (which are already present for electrical connections) to serve the additional function of light shielding. By utilizing these existing metal structures rather than adding separate light-shielding materials, the manufacturing cost is reduced while still achieving the light leakage prevention function.
2Object-affected harmful factors
If a black matrix is formed at the periphery of each pixel area to prevent light leakage, then light leakage is reduced, but manufacturing process complexity increases due to additional mask processes
Solution Approach 1:
The patent merges the light-shielding function with the existing metal patterns used for electrical connections. The metal patterns are designed to define pixel areas and simultaneously serve as light-shielding structures at the pixel periphery, eliminating the need for separate black matrix formation processes.
Solution Approach 2:
The metal patterns perform multiple functions: they provide electrical connections and simultaneously serve as light-shielding structures. This multi-functionality reduces the number of separate components and manufacturing steps required, simplifying the overall manufacturing process while maintaining effective light leakage prevention.
3Object-affected harmful factors
If a black matrix is formed at the periphery of each pixel area to prevent light leakage, then light leakage is reduced, but reliability deteriorates due to difficult patterning
Solution Approach 1:
The patent combines the light-shielding function with the existing metal pattern formation process. Since the metal patterns are already being formed for electrical connections, adding the light-shielding function to these same patterns eliminates the need for separate, complex patterning processes, thereby improving manufacturing reliability.
Solution Approach 2:
The metal patterns inherently provide light-shielding properties due to their material characteristics. By utilizing this self-service property of the metal patterns, the system eliminates the need for additional specialized light-shielding materials and processes, reducing complexity and improving reliability.
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 solution improves image quality by preventing light leakage, maintaining brightness, and simplifying the manufacturing process while reducing reliability issues associated with black matrices, thereby enhancing the overall performance and efficiency of organic light emitting display devices.
Implementation Method 1
light emitted from the exterior or from adjacent pixel areas is reflected by metal patterns
Data Source
AI summary
Provided are an organic light emitting display (OLED) device and method for manufacturing the same. The OLED device includes: a plurality of gate lines in one direction on a substrate, a plurality of light-shielding patterns corresponding to at least parts of peripheries of the respective pixel regions on the substrate, the light-shielding patterns spaced apart from the gate lines, at least one insulating film covering the substrate, the gate lines, and the light-shielding patterns, a plurality of data lines in another direction crossing the gate lines on the insulating film to define the pixel areas, a passivation film covering the insulating film and the data lines, a plurality of color filters in the pixel areas on the passivation film, an over-coating film evenly covering the passivation film and covering the color filters, and a plurality of organic light emitting elements in the pixel areas on the over-coating film.