Liquid Crystal Phase Difference Film Partitioning
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Solution Overview
Problem
Existing liquid crystal displays face challenges in maintaining high contrast in both reflective and transmissive modes due to variations in phase difference film thickness at the outer periphery, leading to light leakage and complex production processes.
Innovation Solution
A liquid crystal device with a phase difference film partitioned by a light-shielding partition wall member on one substrate, combined with a color filter and alignment film, which prevents film thickness variations and allows for efficient material use, ensuring consistent contrast in both display modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If patterning by photo-etching is used to form the phase difference film, then the phase difference film can be formed on the substrate, but the film thickness varies at the outer periphery causing light leakage and contrast reduction
Solution Approach 1:
The patent divides the pixel region into multiple segments using partition walls, and forms the phase difference film in each segmented region separately. This segmentation prevents the film thickness variation that occurs at the outer periphery of a large continuous film, thereby maintaining uniform thickness and preventing light leakage while still enabling efficient manufacturing.
2Manufacturing precision
If the phase difference film is patterned according to red, blue, and green pixels, then color accuracy is improved, but the production process becomes complicated
Solution Approach 1:
The patent combines the phase difference film formation with the color filter formation process. By integrating these two functions into a single structural element, the need for separate patterning of the phase difference film for each color is eliminated, thereby maintaining color accuracy while significantly simplifying the production process.
3Ease of manufacture
If photo-etching is used for patterning the phase difference film, then the film can be formed selectively, but most of the material is wasted
Solution Approach 1:
The patent employs self-aligned formation methods where the partition walls automatically define the boundaries for phase difference film deposition. This self-service approach eliminates the need for separate photomask alignment and patterning steps, enabling selective film formation in each pixel region while minimizing material waste through precise localized deposition.
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
The solution effectively suppresses light leakage and maintains high contrast in both reflective and transmissive modes, enhancing image quality and simplifying the production process.
Implementation Method 1
a partition wall member having light-shielding properties, the partition wall member being provided on a surface of the one substrate adjacent to the liquid crystal layer to partition the phase difference film
Data Source
AI summary
A liquid crystal device includes a pair of substrates; a liquid crystal layer sandwiched between the pair of substrates; a plurality of pixels each including a plurality of pixel regions, each of the pixel regions having a reflective display region and a transmissive display region; a phase difference film provided in the reflective display region, the phase difference film being located at a side of one substrate of the pair of substrates adjacent to the liquid crystal layer; and a partition wall member having light-shielding properties, the partition wall member being provided at the side of the one substrate adjacent to the liquid crystal layer to partition the phase difference film.