LCD Panel Curing Voltage Ratio Control
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Solution Overview
Problem
Existing LCD panel manufacturing methods using PSA technology face challenges in minimizing color-shift and color washout phenomena, especially when scaling to larger dimensions, due to non-uniform liquid crystal molecule orientation and voltage distribution.
Innovation Solution
The method involves varying the ratio of liquid crystal capacitors to storage capacitors in each pixel unit during the curing process, allowing for uniform liquid crystal molecule orientation by applying specific curing voltages to ensure a voltage ratio of 0.9 to 1.1 between pixel electrodes, thereby eliminating disinclination lines and enhancing image display capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single curing voltage is applied to the common electrode during the curing process, then the manufacturing process is simple, but the liquid crystal molecule orientation becomes non-uniform, causing color-shift and color washout phenomena
Solution Approach 1:
The common electrode is divided into multiple regions (first common electrode region and second common electrode region) that can be independently controlled. Different curing voltages are applied to different regions to achieve uniform liquid crystal molecule orientation across the entire display panel, thereby eliminating color-shift and color washout phenomena while maintaining manufacturing simplicity.
Solution Approach 2:
Different voltage levels are applied to different regions of the common electrode based on local requirements. The first common electrode region receives a first curing voltage while the second common electrode region receives a second curing voltage, allowing each region to be optimized for its specific characteristics and achieving overall uniformity in liquid crystal orientation.
2Ease of manufacture
If the ratio of liquid crystal capacitors to storage capacitors is not adjusted, then the manufacturing process is straightforward, but voltage distribution across pixel electrodes becomes non-uniform, resulting in disinclination lines
Solution Approach 1:
The capacitance values of liquid crystal capacitors and storage capacitors are adjusted to achieve a specific ratio relationship. By changing the capacitor parameters (either liquid crystal capacitor capacitance or storage capacitor capacitance), the voltage distribution across pixel electrodes is optimized to ensure uniformity and eliminate disinclination lines during the curing process.
3Ease of manufacture
If curing voltage is applied only during the curing process, then the process is simple, but the response time for displaying images remains long
Solution Approach 1:
Liquid crystal molecules are pre-oriented during the curing process by applying curing voltage to form polymers that guide molecule alignment. This preliminary action creates a favorable initial state that enables faster response during subsequent image display operations, effectively reducing response time without complicating the voltage application timing.
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 approach results in a more uniform liquid crystal molecule distribution, reducing color-shift and color washout issues, and significantly improving the display quality of LCD panels by ensuring consistent voltage levels across pixel electrodes.
Implementation Method 1
an electric field is generated that forces the liquid crystal molecules in the liquid crystal layer to change their orientation from the pretilt angle to an appropriate angle
Implementation Method 2
form polymers within the liquid crystal layer for influencing the liquid crystal molecules in the liquid crystal layer to extend in a pretilt angle
Data Source
AI summary
An LCD panel includes a pixel unit having a first and a second pixel electrodes. The method includes: providing a first and a second curing voltages Vcuring1, Vcuring2 based on V1=[Cst1/(Cst1+Clc1)]×Vcuring1 and V2=[Cst2/(Cst2+Clc2)]×Vcuring2, in which, V1=a voltage of the first pixel electrode and V2=a voltage of the second pixel electrode, Clc1=a first liquid crystal capacitor formed by the first pixel electrode, a liquid crystal layer and a first common electrode, Cst1=a first storage capacitor formed by a first capacitor electrode, a dielectric layer and a second common electrode, Clc2=a second liquid crystal capacitor formed by the second pixel electrode, the liquid crystal layer and the first common electrode, Cst2=a second storage capacitor formed by a second capacitor electrode, the dielectric layer and a third common electrode, and applying the first and the second curing voltages simultaneously onto the second and the third common electrodes of the pixel unit to result in a ratio of the voltage of the first pixel electrode to the voltage of the second pixel electrode ranging from 0.9 to 1.1.