LC Photo-Alignment Voltage Circuit Isolation
Solution Overview
Problem
In LC photo-alignment panels, abnormal currents at one CF_Com signal input terminal can cause abnormal photo-alignments in other panels due to shared power supplies, leading to inefficient and inaccurate liquid crystal molecule alignment.
Innovation Solution
A voltage-applying circuit with switch control circuits connected between each liquid crystal panel and its corresponding voltage-applying point group, which disconnects G_Odd, G_Even, R, G, and B signal input terminals from their voltage-applying points when an abnormal current is detected at the CF_Com signal input terminal, preventing the propagation of abnormal currents to other panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If voltage-applying points having the same function are connected to the same power supply to save power, then power consumption is reduced, but when one liquid crystal panel has a short circuit, abnormal current propagates to other panels causing abnormal photo-alignment
Solution Approach 1:
The patent divides the common power supply system into separate independent power supplies for each liquid crystal panel. Specifically, each panel's CF_Com voltage-applying point is connected to its own dedicated power supply rather than sharing a common bus, thereby segmenting the electrical system to prevent abnormal current propagation while maintaining power efficiency through optimized voltage application timing.
2Device complexity
If CF_Com voltage-applying points are connected in sequence to form a common bus to share power supply, then device complexity is reduced, but abnormal current in one panel affects all other panels
Solution Approach 1:
The patent eliminates the common CF_Com voltage-applying bus by providing separate voltage-applying paths for each liquid crystal panel. Each panel has its own CF_Com voltage-applying point connected independently to the voltage-applying point group, preventing harmful current propagation while managing complexity through systematic circuit design.
Solution Approach 2:
The patent introduces switch control circuits as intermediary devices between the voltage-applying point groups and the liquid crystal panels. These switches act as mediators that can isolate individual panels when abnormal current is detected, preventing cross-panel interference while maintaining normal operation of unaffected panels.
3Reliability
If switch control circuits are added to disconnect terminals when abnormal current is detected, then cross-panel interference is prevented, but device complexity increases
Solution Approach 1:
The patent introduces switch control circuits as intermediary devices between the voltage-applying point groups and the liquid crystal panels. These switches act as mediators that can isolate individual panels when abnormal current is detected, preventing cross-panel interference while maintaining normal operation of unaffected panels. The switch control circuits include detection units that monitor current and control units that activate switches to disconnect problematic panels.
Solution Approach 2:
The patent implements feedback mechanisms through current detection circuits that continuously monitor the electrical state of each liquid crystal panel. When abnormal current is detected in a panel's CF_Com signal input terminal, the feedback signal triggers the switch control circuit to disconnect that panel's voltage-applying points, thereby protecting other panels while maintaining overall system reliability.
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 isolates abnormal currents, ensuring normal photo-alignment processes for other liquid crystal panels by disconnecting affected terminals from their power sources, thereby preventing cross-panel interference and maintaining accurate alignment.
Implementation Method 1
exposing a LCD panel to ultraviolet when a voltage is being applied to the LCD panel, so as to cause the monomer of the LCD to react and allow a liquid crystal molecule to form a pre-tilt angle
Data Source
AI summary
The A voltage-applying circuit for LC photo-alignment, comprising: a plurality of liquid crystal panels each of which comprises G_Odd, a G_Even, a R, a B, a G, a CF_Com, and a TFT_Com signal input terminals; a plurality of voltage-applying point groups connected to the liquid crystal panels, each voltage-applying point group comprising G_Odd, a G_Even, a R, a G, a B, a CF_Com, and a TFT_Com voltage-applying points respectively connected to the G_Odd, G_Even, R, G, B, CF_Com, and TFT_Com signal input terminals of the corresponding liquid crystal panel; a voltage supplying module comprising a plurality of power sources each of which is connected to the voltage-applying points of the voltage-applying point groups having the same function; and a plurality of switch control circuits each of which is connected between each liquid crystal panel and the voltage-applying point group.