Liquid Crystal Efficiency Measurement Without Disassembly
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Solution Overview
Problem
Current methods for measuring liquid crystal efficiency in liquid crystal panels are inaccurate and inefficient, requiring multiple measurements and disassembly of the module, which leads to fluctuations and reduced accuracy.
Innovation Solution
A method that keeps the lower polarizing plate unchanged and adjusts the upper polarizing plate to be parallel or perpendicular to it, measuring brightness at 0 and 255 gray levels to calculate liquid crystal efficiency without disassembling the module, thereby simplifying the process and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional method of measuring transmittance multiple times with disassembly is used, then the measurement can be performed, but the measurement precision and efficiency are low due to variations and approximations
Solution Approach 1:
The measurement process is segmented into distinct polarization states (parallel and perpendicular configurations), allowing separate measurement of different optical paths. This segmentation enables precise calculation of liquid crystal efficiency by comparing brightness values from controlled states without requiring multiple transmittance measurements or disassembly operations.
Solution Approach 2:
The polarizing plates are pre-configured into specific parallel or perpendicular states before measurement begins. This preliminary arrangement of polarization axes eliminates the need for repeated disassembly and reassembly during measurement, as all necessary measurements are taken from these pre-established states, improving both precision and efficiency.
2Measurement precision
If the conventional method requiring disassembly is used, then transmittance measurements can be obtained, but the process complexity and time consumption increase
Solution Approach 1:
Instead of disassembling the module to access the liquid crystal layer for direct measurement, the invention inverts the approach by keeping the module assembled and using polarizing plate configuration changes (parallel vs. perpendicular states) to isolate and measure the liquid crystal's optical effects. This inversion simplifies the measurement process while maintaining precision.
Solution Approach 2:
The measurement method changes the polarization state parameter (from parallel to perpendicular configuration) rather than physically disassembling the module. By varying this optical parameter, the liquid crystal efficiency can be determined through brightness comparisons without increasing device complexity or requiring complex disassembly procedures.
3Reliability
If multiple transmittance measurements are performed, then comprehensive data can be collected, but the measurement time and operational complexity increase
Solution Approach 1:
Multiple measurement conditions (parallel and perpendicular polarization states) are merged into a single measurement framework. By taking brightness measurements from both states in sequence without disassembly, the method achieves reliable liquid crystal efficiency calculation in fewer operational steps, reducing measurement time while maintaining reliability through comparative analysis.
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 method provides a more accurate and efficient measurement of liquid crystal efficiency by eliminating the need for multiple transmittance measurements and disassembly, ensuring consistent backlight brightness and reducing the complexity and cost of polarizer reattachment.
Implementation Method 1
When the light is through the liquid crystal layer, the linearly polarized light is divided into two beams due to the refraction of the liquid crystal
Implementation Method 2
After the light through the polarizing plate of the lower substrate (i.e. TFT substrate), the light become linearly polarized light, the direction of the polarization is the direction of the polarization axis of the lower polarizing plate
Data Source
AI summary
The present disclosure providing a method for measuring the liquid crystal efficiency of the liquid crystal layer to the incident light, the method includes: keeping the lower polarizing plate unchanged to make the upper polarizing plate and the lower polarizing of the liquid crystal layer in a first state; in the first state, controlling the brightness of the screen of the liquid crystal panel to be 0 gray and to be 255 to measure the brightness Lvx and Lvy of the target position of the liquid crystal panel, respectively; according to the brightness Lvx and the brightness Lvy, determining the liquid crystal efficiency of the liquid crystal layer to the incident light. By the above method, the present disclosure could be performed without disassembling the module, number of the measurements is few and simple, and the efficiency and the accuracy are high.