Color Filter Projections Eliminate Adhesive Layers for Light Extraction
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Solution Overview
Problem
In light-emitting devices with organic EL elements, cross-talk between colors occurs due to the thickness of adhesive layers or glass substrates between color filters and reflectors, leading to reduced light extraction efficiency and color purity.
Innovation Solution
A color filter design where projections on the reflector are connected to the color filter layers directly, eliminating the need for an adhesive layer or additional substrate, allowing light to travel in straight lines and be reflected by a mirror film for optimal entry into corresponding color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an adhesive layer or glass substrate is arranged between the color filters and the projections in the reflector, then the color filters can be properly positioned and protected, but light emitted from the light-emitting layer may pass through the projections and enter into color filters not corresponding to the color of the light, causing cross-talk between colors
Solution Approach 1:
The invention removes the adhesive layer or glass substrate that causes cross-talk between colors. By eliminating this intermediate layer, light emitted from the light-emitting layer directly contacts the color filters through the projections, preventing light from entering incorrect color filters and thus eliminating cross-talk while maintaining proper positioning and protection functions
Solution Approach 2:
The projections in the reflector serve as an intermediary structure that enables direct optical contact between the light-emitting layer and color filters. The projections with reflective coating guide light directly to the corresponding color filters, replacing the need for adhesive layers or glass substrates while maintaining proper optical alignment and preventing cross-talk
2Ease of manufacture
If an adhesive layer or glass substrate with thickness of 10 μm or over is used between the color filters and the reflector, then the color filters are properly supported, but light extraction efficiency is reduced due to cross-talk between colors
Solution Approach 1:
The invention extracts and removes the adhesive layer or glass substrate that reduces light extraction efficiency. By eliminating this thick intermediate layer (10 μm or over), light can more efficiently reach the color filters through the projections without being scattered or absorbed, thereby improving light extraction efficiency while the projections provide the necessary structural support
Solution Approach 2:
The projections in the reflector act as thin film structures that replace the thick adhesive layer or glass substrate. These projection structures provide the necessary mechanical support and positioning while allowing light to pass through with minimal interference, thus improving light extraction efficiency compared to using thick adhesive layers or glass substrates
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 configuration reduces light leakage to incorrect color filters, enhances light extraction efficiency, and improves color purity by ensuring light enters the correct filters, thereby improving viewing angle characteristics.
Implementation Method 1
a side surface of each projection is covered with a reflecting mirror film
Implementation Method 2
a plurality of color filter layers for a plurality of colors arranged on a substrate
Data Source
AI summary
A color filter preventing the occurrence of cross-talk between colors while improving light extraction efficiency, a method of manufacturing the color filter, and a light-emitting device are provided. The color filter includes: a plurality of color filter layers for a plurality of colors arranged on a substrate, a plurality of projections arranged in contact with the color filter layers, the projections of which parts on a side closer to the color filter layers are connected to one another; and a reflecting mirror film formed so as to be laid over a side surface of each of the plurality of projections.