Liquid Crystal Device Voltage Inversion Circuit
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Solution Overview
Problem
Liquid crystal devices with memory circuits face challenges in preventing image sticking and flickers due to voltage inversion and direct current offset issues, which complicate the circuit structure and operation.
Innovation Solution
A liquid crystal device employing a lateral electric field system with a novel pixel circuit structure, where a memory circuit serves as a voltage source and an application voltage inverting circuit separately controls voltage inversion, using complementary clock signals to switch voltage supply paths without changing the voltage sources, thereby achieving precise voltage polarity inversion and preventing direct current offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage polarity is periodically inverted to prevent image sticking, then image sticking is prevented, but direct current offset occurs causing flickers and requiring complex circuit structures
Solution Approach 1:
The pixel circuit is divided into distinct functional blocks: a memory circuit that maintains voltage levels and a separate application voltage inverting circuit that handles polarity inversion. This segmentation allows each block to perform its function independently, preventing direct current offset while maintaining simple overall circuit operation.
Solution Approach 2:
The memory circuit acts as an intermediary between the voltage source and the liquid crystal element. It maintains the voltage level while the application voltage inverting circuit, controlled by clock signals, handles the polarity inversion. This intermediary structure prevents direct current offset from occurring in the liquid crystal element.
2Reliability
If complex voltage inversion control is implemented to prevent direct current offset, then flickers are reduced, but circuit operation becomes complicated
Solution Approach 1:
The application voltage inverting circuit uses clock signals to periodically invert the voltage polarity applied to the liquid crystal element. This periodic action automatically prevents direct current offset and associated flickers without requiring complex control logic, as the inversion occurs rhythmically based on the clock signal frequency.
Solution Approach 2:
The application voltage inverting circuit automatically performs polarity inversion based on clock signals without requiring external intervention or complex control. The circuit self-regulates to prevent direct current offset, simplifying the overall operation while maintaining high reliability in preventing flickers.
3Area of stationary object
If memory circuit is integrated with voltage inversion function, then circuit area is reduced, but voltage inversion precision decreases causing residual offset
Solution Approach 1:
The pixel circuit is segmented into a memory circuit for voltage level maintenance and a separate application voltage inverting circuit for precise polarity inversion. This segmentation allows each circuit to be optimized for its specific function, ensuring high voltage inversion precision while maintaining compact overall circuit area through efficient layout of the separated functional blocks.
Solution Approach 2:
The memory circuit serves as an intermediary that maintains precise voltage levels before the voltage is inverted by the application voltage inverting circuit. This intermediary structure ensures that the voltage inversion process starts from a stable, well-defined voltage level, thereby maintaining high inversion precision even in a compact circuit configuration.
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 enables high-precision voltage inversion, inhibits flickers, and maintains a short-circuited state without direct current offset, resulting in improved image quality and reduced temporal deterioration of the display.
Implementation Method 1
an application voltage inverting circuit which inverts voltages applied to the liquid crystal molecules by controlling each of the first voltage and the second voltage supplied from the memory circuit so as to be supplied to either the first pixel electrode or the second pixel electrode
Implementation Method 2
a lateral electric field system liquid crystal element having a first pixel electrode and a second pixel electrode which controls alignment of liquid crystal molecules by applying an electric field parallel to a surface of a substrate
Data Source
AI summary
A liquid crystal device includes a liquid crystal element having a first pixel electrode and a second pixel electrode which control alignment of liquid crystal molecules by applying an electric field in a direction parallel to a surface of a substrate to a liquid crystal layer, a memory circuit which is disposed in a pixel circuit and which serves as a voltage source of a first voltage and a second voltage, and an application voltage inverting circuit which is disposed in the pixel circuit and which inverts voltages applied to the liquid crystal element by controlling each of the first voltage and the second voltage so as to be supplied to either the first pixel electrode or the second pixel electrode of the liquid crystal element.