Color Filter Array Alignment in Electro-Optic Displays
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Solution Overview
Problem
The challenge in producing high-quality full-color electro-optic displays is the difficulty in laminating color filter arrays to backplanes without trapping air bubbles, which increases production costs and time, and results in inconsistent display quality due to the rigidity and alignment issues of glass sheets.
Innovation Solution
A process that decouples the lamination of the electro-optic layer from the color filter array, involving a flowable material and spacers to align and secure the color filter array over an electrically-conductive layer, allowing for independent choice of conductive and electro-optic layers, and using variants like front plane laminates and double release films to facilitate alignment and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If color filter arrays are laminated to backplanes using conventional methods, then alignment and adhesion can be achieved, but air bubbles are trapped and production costs and time increase
Solution Approach 1:
The patent extracts the color filter array from the lamination process by providing it in a dry-transferred, pre-aligned state. This removes the color filter array from the conventional lamination sequence, eliminating the source of air bubble entrapment while maintaining alignment and adhesion requirements.
Solution Approach 2:
The color filter array is pre-aligned and pre-mounted on the backplane before the electro-optic layer is applied. This preliminary action ensures proper positioning and alignment are achieved before the final assembly, preventing the need for high-pressure lamination that would trap air bubbles.
2Stability of the object's composition
If glass sheets are used for color filter arrays, then structural stability is achieved, but alignment issues and rigidity problems occur
Solution Approach 1:
The patent replaces rigid glass sheets with flexible thin-film color filter arrays that can be conformally mounted on the backplane. These thin films maintain structural stability while being flexible enough to achieve precise alignment without the rigidity problems of glass, eliminating alignment issues during assembly.
3Strength
If conventional lamination is used to attach color filter arrays, then adhesion is achieved, but air bubble trapping increases
Solution Approach 1:
The patent introduces a flowable material as an intermediary between the electro-optic layer and the backplane with pre-mounted color filter array. This intermediary material provides adhesion strength while its flowable nature allows it to conform to the surface without trapping air bubbles, replacing the need for high-pressure conventional lamination.
4Ease of manufacture
If electro-optic layer and color filter array are laminated together, then assembly is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the assembly process into distinct steps: first mounting the color filter array on the backplane, then separately applying the electro-optic layer. This segmentation simplifies manufacturing by allowing each component to be prepared and positioned independently, reducing the complexity of simultaneous multi-component lamination.
Data Source
AI summary
A process for producing a color electro-optic display uses an electro-optic sub-assembly comprising an electro-optic layer and a light-transmissive electrically-conductive layer. This sub-assembly is laminated to a backplane comprising a plurality of electrodes with the electro-optic layer disposed between the backplane and the electrically-conductive layer. A flowable material is placed over the sub-assembly and a color filter array is placed over the electrically-conductive layer and aligned with the electrodes of the backplane to form the color electro-optic display.