Color Filter Layer Structure for OLEDs Preventing Color Mixture
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Solution Overview
Problem
Organic light emitting display devices face color mixture defects due to bank defects or degradation of droplet directionality in inkjet head technology, which complicates the manufacturing process and increases material usage.
Innovation Solution
The implementation of a color filter layer structure in organic light emitting display devices, comprising a first color filter with openings and second and third color filters formed within these openings, using a combination of photolithography and inkjet processes to simplify manufacturing and reduce material usage, thereby preventing color mixture defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inkjet technique is used to form color filters, then manufacturing time is shortened, but color mixture defects occur due to bank defects or degradation of droplet directionality
Solution Approach 1:
The color filter layer is divided into multiple sub-layers: a first color filter layer formed by photolithography and second/third color filter layers formed by inkjet technique within openings of the first layer. This segmentation allows each layer to perform its function optimally without interference, preventing color mixture defects while maintaining manufacturing efficiency
Solution Approach 2:
The second and third color filters are formed within the openings of the first color filter layer, creating a nested structure where smaller elements are placed within larger ones. This nested arrangement prevents color mixture by containing the inkjet-formed filters within the boundaries established by the photolithography-formed first layer
2Manufacturing precision
If photolithography technique is used to form color filters sequentially, then manufacturing precision is improved, but manufacturing time increases
Solution Approach 1:
The invention combines photolithography and inkjet techniques in a single integrated process. The first color filter layer is formed by photolithography, and the second and third color filters are formed by inkjet within its openings, allowing both high precision and efficient manufacturing in one process flow
Solution Approach 2:
The first color filter layer is formed in advance by photolithography to create a precise template with openings. This preliminary action establishes the precise boundaries before the inkjet process, ensuring that subsequent color filters are deposited accurately without mixture while maintaining overall manufacturing efficiency
3Manufacturing precision
If multiple color filters are formed separately, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The first color filter layer serves multiple functions: it acts as a precise template for the inkjet process, provides structural support, and functions as a color filter itself. This multi-functionality reduces the need for separate components and simplifies the overall manufacturing process while maintaining precision
Data Source
AI summary
An organic light emitting display device includes a substrate, first electrodes disposed on the substrate; an organic light emitting layer formed on the first electrodes; a second electrode disposed on the organic light emitting layer; and a color filter layer formed on the second electrode. The color filter layer includes a first color filter, a second color filter, and a third color filter. The second color filter and the third color filter are disposed pixel blocks included in the first color filter.