ECB Liquid Crystal Display Residual Retardation Compensation
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Solution Overview
Problem
Conventional ECB mode transflective LCD devices face challenges in achieving a dark state due to residual retardation, which is difficult to eliminate with polarizing plates alone, leading to increased thickness and limited performance.
Innovation Solution
The solution involves placing first and second polarizing members on the upper and lower sides of the ECB mode liquid crystal panel and incorporating a compensation film, either an optical viewing angle compensation film or a retardation film, between these polarizing members to reduce or prevent residual retardation, thereby improving contrast and viewing angle without the need for additional retardation films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If retardation films and polarizing plates are arranged on both upper and lower sides of the ECB mode liquid crystal panel, then the liquid crystal display device can display images, but the thickness of the LCD device increases
Solution Approach 1:
The patent combines the functions of retardation films and polarizing plates into a single integrated optical compensation structure. By using an optical compensation film that integrates both retardation and polarizing functions, the patent eliminates the need for separate retardation films on both sides of the liquid crystal panel, thereby reducing overall device thickness while maintaining display performance.
Solution Approach 2:
The optical compensation film serves multiple functions simultaneously: it acts as both a retardation film and a polarizing plate, and provides both image display and optical compensation functions. This multi-functional design eliminates the need for separate dedicated retardation films and polarizing plates, reducing the number of layers and overall device thickness.
2Device complexity
If only polarizing plates are formed on the liquid crystal panel, then the device structure is simplified, but retardation state remains in the ECB mode liquid crystal panel making dark state difficult to attain
Solution Approach 1:
The patent merges the retardation function and polarizing function into a single optical compensation film. This integrated structure provides both the necessary retardation compensation to achieve dark states and the polarizing function for image display, maintaining structural simplicity while ensuring proper optical performance.
Solution Approach 2:
The optical compensation film acts as an intermediary element that provides both retardation compensation and polarizing functions. By positioning this multi-functional film between the light source and the liquid crystal panel, the patent achieves proper optical control without requiring separate retardation films, thus maintaining simplicity while ensuring dark state capability.
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 residual retardation, enhances contrast and viewing angle, and reduces the overall thickness of the LCD device by eliminating the requirement for separate retardation films, resulting in improved performance and design efficiency.
Implementation Method 1
an electrically controlled birefringence (ECB) mode liquid crystal panel 200 may include first and second substrates 50 and 10, first and second orientation films 42 and 44 respectively arranged to oppose each other on inner sides of the first and second substrates 50 and 10, and a liquid crystal layer 40 between the first and second substrates 50 and 10
Implementation Method 2
a first polarizing member 70 and a second polarizing member 80. The first polarizing member 70 may be arranged on an outer surface of the first substrate 50, and the second polarizing member 80 may be arranged on an outer surface of the second substrate 10
Implementation Method 3
a compensation film 90. The compensation film 90 may be formed between the ECB mode liquid crystal panel 200 and the second polarizing member 80
Data Source
AI summary
A liquid crystal display device capable of reducing and/or preventing occurrence(s) of retardation remaining in an ECB mode liquid crystal panel may include first and second substrates, first and second orientation films respectively arranged to oppose each other on facing sides of the first and second substrates, and a liquid crystal layer between first and second substrates. The liquid crystal display device may include a first polarizing member formed on a side of the first substrate other than the side on which the first orientation film is formed, a second polarizing member formed on a side of the second substrate other than the side on which the second orientation film is formed, a compensation film formed between the electrically controlled birefringence mode liquid crystal panel and the first polarizing member, or between the electrically controlled birefringence mode liquid crystal panel and the second polarizing member.