OLED Display Black Matrix and Color Resist Structure
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Solution Overview
Problem
Conventional OLED display devices face challenges in reducing light reflectance without increasing product cost, as polarizers used to address reflectance issues are thick, brittle, and costly, while polarizer-less technologies require multiple photomasks, increasing manufacturing costs.
Innovation Solution
The OLED display device incorporates a black matrix and color resists positioned within openings extending through a second metal layer and a hard mask, using silicon nitride for the hard mask and transparent metal layers with aluminum and titanium structures, reducing the number of masks needed and enhancing light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizer is used to reduce light reflectance, then reflectance is reduced, but the device becomes thicker, more brittle, and more costly
Solution Approach 1:
The patent combines the black matrix and color filter functions into a single integrated structure. The black matrix is formed first, then color resists are deposited directly onto it, creating a unified component that serves both as a light-blocking element and a color-defining element, eliminating the need for separate polarizer layers
Solution Approach 2:
The patent replaces expensive, fragile polarizer materials with cheaper, more durable alternatives consisting of black matrix materials (such as ITO and metal oxides) and color resist materials that can be deposited as thin films, significantly reducing material cost and improving flexibility
2Object-affected harmful factors
If polarizer-less technology with color filters is used to reduce reflectance, then reflectance is reduced and lifespan is extended, but the number of photomasks increases, raising manufacturing cost
Solution Approach 1:
The patent merges the black matrix formation and color filter deposition into a single manufacturing sequence. The black matrix is formed by patterning a first material layer, then color resists are deposited and patterned in the same process flow, reducing the total number of photomasks required compared to separate processing steps
Solution Approach 2:
The patent performs preliminary patterning of the black matrix structure before depositing the color resist materials. This preliminary action establishes the base structure that guides subsequent color resist placement, allowing for more efficient manufacturing with fewer masking steps
Data Source
AI summary
An organic light emitting diode (OLED) display device includes an OLED display panel, a first insulating layer disposed on the OLED display panel, a first metal layer disposed on the first insulating layer, a second insulating layer disposed on the first metal layer and the first insulating layer, a second metal layer disposed on the second insulating layer, a black matrix disposed on the second metal layer, a hard mask disposed on the black matrix, and color resists disposed on the OLED display panel. The OLED display panel includes sub-pixels. Openings extend through the second metal layer, the black matrix, and the hard mask and are positioned corresponding to the sub-pixels. Each color resist is disposed in the openings. The present invention can effectively eliminate reflective light under strong light, and provide a manufacturing process implemented with a small number of masks at a lower product cost.