LCD Alignment Circuit ESD Protection via Short Bar
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Solution Overview
Problem
Conventional multi-domain vertical alignment (MVA) LCD panels face issues with image mura due to unstable curing voltage and electrostatic discharge (ESD) during the alignment process, which degrades display quality and brightness performance.
Innovation Solution
The implementation of a short bar circuit that couples the multiplexer to a predetermined voltage during the alignment period, along with the provision of a curing voltage and UV light, ensures stable conditions by preventing ESD from reaching the data lines, thereby improving image quality by reducing mura.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the multiplexer is left floating during the alignment period, then the device structure remains simple, but unstable curing voltage and electrostatic discharge affect the alignment process causing image mura
Solution Approach 1:
The patent applies preliminary action by establishing a predetermined voltage level for the multiplexer before the alignment process begins. The short bar circuit is configured to couple the multiplexer to this predetermined voltage during the alignment period, ensuring that the multiplexer is already in a stable state before curing voltage is applied to the data lines. This prevents ESD and voltage instability from affecting the alignment process, thereby improving alignment stability without significantly increasing device complexity.
2Object-affected harmful factors
If a short bar circuit is added to couple the multiplexer to predetermined voltage, then ESD protection and alignment stability are improved, but the device complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a short bar circuit as a mediator between the multiplexer and the predetermined voltage source. This short bar circuit acts as a protective intermediary that blocks ESD from reaching the data lines and alignment circuit while maintaining the necessary electrical connections. The short bar circuit is a simple additive component that provides ESD protection and voltage stabilization without significantly complicating the overall device architecture.
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 solution effectively prevents ESD and unstable curing voltage from affecting the alignment process, enhancing display quality by minimizing image mura and maintaining brightness performance.
Implementation Method 1
The monomer is then activated by UV radiation while applying a curing voltage. The monomer reacts with the polymer layer to form a surface that fixes the pre-tilt angle of the liquid crystal molecules.
Implementation Method 2
Unstable curing voltage or electrostatic discharge (ESD) may influence the alignment process and cause image mura which downgrades display quality.
Data Source
AI summary
A liquid crystal display device includes a display panel, a multiplexer, an alignment circuit and a short bar circuit. The multiplexer is configured to provide a plurality of output data signals according to a plurality of switch control signals and an input data signal. During the alignment period, the alignment circuit is configured to provide a curing voltage to the display panel, and the short bar circuit is configured to couple the multiplexer to a predetermined voltage.