Method for controlling display device switchable between a transparent state and an opaque state, and display device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorTakeichi Shinya
Life of this patent
Estimating the term…
Abstract
A method of controlling a display device is a method for controlling a display device including a light modulation sheet switchable between a transparent state and an opaque state. When an operation to turn on the display device is obtained, a PWM waveform for generating an alternating voltage based on a direct voltage is output, the alternating voltage having a duty cycle of 50% at a phase of 0 degrees or 180 degrees, the alternating voltage is generated from the direct voltage, based on the PWM waveform output, and the alternating voltage generated is output to the light modulation sheet.
Claims10
A method for controlling a display device including a light modulation sheet switchable between a transparent state and an opaque state, the method comprising:
- outputting a pulse width modulation (PWM) waveform for generating an alternating voltage based on a direct voltage, when obtaining a first operation to turn on the display device, the alternating voltage having a duty cycle of 50% at a phase of 0 degrees or 180 degrees;
- generating the alternating voltage from the direct voltage based on the PWM waveform output;
- and
- outputting the alternating voltage generated to the light modulation sheet, wherein:
- the light modulation sheet is switchable to one or more intermediate states between the transparent state and the opaque state, and
- when the direct voltage for one intermediate state among the one or more intermediate states is lower than or equal to a predetermined voltage and switch to the one intermediate state is executable, any PWM waveform is output.
A display device comprising:
- a light modulation sheet switchable between a transparent state and an opaque state;
- a microcomputer which outputs a PWM waveform for generating an alternating voltage based on a direct voltage when obtaining an operation to turn on the display device, the alternating voltage having a duty cycle of 50% at a phase of 0 degrees or 180 degrees;
- and
- a drive circuit which generates the alternating voltage from the direct voltage based on the PWM waveform output, and outputs the alternating voltage generated to the light modulation sheet, wherein:
- the light modulation sheet is configured to be switchable to one or more intermediate states between the transparent state and the opaque state, and
- the microcomputer is configured to output, when the direct voltage for one intermediate state among the one or more intermediate states is lower than or equal to a predetermined voltage and switch to the one intermediate state is executable, any PWM waveform.
Dependencies are inferred from the claim text.