Display Device Monopolar Rectangular Wave Voltage Circuit
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Solution Overview
Problem
Existing display devices using liquid crystal technology require complex power sources and drive circuits due to the need for bipolar AC voltage, leading to increased power consumption and circuit complexity.
Innovation Solution
A display device with a simplified circuit structure that applies first rectangular wave voltage and second rectangular wave voltage, with pulse voltage superimposed on the second wave, to change the optical state of the optical layer, allowing for reduced power consumption and flexibility in timing changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bipolar AC voltage is applied to enhance flexibility of timing when optical state is changed, then timing flexibility is improved, but power sources and drive circuit become complicated
Solution Approach 1:
The patent changes the voltage waveform parameters from conventional AC sine wave to rectangular wave, and applies monopolar voltage instead of bipolar voltage. This parameter change allows achieving timing flexibility through pulse width modulation while simplifying the power source requirement to a single positive voltage supply, thus resolving the contradiction between timing flexibility and circuit complexity
Solution Approach 2:
The patent employs periodic rectangular wave voltage application with controlled pulse widths to achieve optical state switching. By using periodic monopolar rectangular waves with adjustable duty cycles, the system achieves timing flexibility without requiring complex bipolar voltage generation circuits
2Adaptability or versatility
If bipolar AC voltage is applied to enhance flexibility of timing when optical state is changed, then timing flexibility is improved, but power consumption becomes large
Solution Approach 1:
The patent changes from bipolar AC voltage to monopolar rectangular wave voltage, which reduces the average power consumption while maintaining timing flexibility through pulse width control. The monopolar rectangular wave applies voltage only during the required time period, minimizing energy waste compared to bipolar AC voltage that requires both positive and negative voltage cycles
Solution Approach 2:
By using periodic monopolar rectangular wave voltage with adjustable pulse widths, the system achieves timing flexibility while minimizing power consumption. The voltage is applied only during the necessary time intervals, reducing overall energy consumption compared to continuous bipolar AC voltage application
3Duration of action of stationary object
If AC voltage driving operation is carried out, then liquid crystal element life is extended, but circuit structure becomes complex and power consumption increases
Solution Approach 1:
The patent changes the voltage waveform from conventional AC sine wave to monopolar rectangular wave. This parameter change extends liquid crystal element life by avoiding DC bias while simplifying the circuit structure to require only a single positive voltage power source, thus resolving the contradiction between element life extension and circuit complexity
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
The solution enables a display device with reduced power consumption and simplified circuitry, while maintaining desired optical characteristics and allowing for arbitrary timing changes in optical properties.
Implementation Method 1
a screen (21) including an optical layer (25) of which optical state is changed when voltage is applied to the optical layer (25)
Data Source
AI summary
A display device having a simple circuit configuration and capable of lowering power consumption, and a drive method for the display device are provided. Rectangular wave voltage which changes between positive voltage V11 and 0 volt in cycle which is two times of cycle during which an optical state of an optical layer is changed is applied to an opposite electrode of a screen in a reverse mode. Pulse voltage which becomes a potential difference between electrodes of which optical state is changed when the optical state of the optical layer is changed is applied to a control electrode in a superimposed manner on rectangular wave voltage which changes between positive voltage V12 and 0 volt, which has the same cycle and the same phase as the rectangular wave voltage applied to the opposite electrode and which has the same value as V11.