Abstract: A cholesteric liquid crystal display device includes a passive matrix cholesteric liquid crystal display element, a drive circuit configured to apply a voltage pulse by a dynamic driving scheme to the cholesteric liquid crystal display element, an electrostatic capacitance detection circuit configured to detect the electrostatic capacitance of the display element; and a drive condition adjustment circuit configured to set a display state by driving the display element under a predetermined drive condition and then to adjust the drive condition of the display element based on the electrostatic capacitance of the display element detected by the electrostatic capacitance detection circuit, wherein the drive condition adjustment circuit searches for and determines an optimum evolution voltage with a temporarily-determined number of pulses during an evolution period and then searches for and determines an optimum value of the number of pulses during the evolution period with the determined evolution voltage.

Abstract: A cholesteric liquid crystal display device includes: a cholesteric liquid crystal display element; a segment driver and a common driver; a multi-voltage generation circuit configured to generate voltages supplied to the segment driver and the common driver; a temperature sensor; and a control circuit configured to control the segment driver, the common driver, and the multi-voltage generation circuit, wherein the control circuit: controls the segment driver and the common driver to perform a dynamic drive sequence having a preparation period during which the cholesteric liquid crystal is brought into a homeotropic state, a selection period during which the final state of the cholesteric liquid crystal is selected, and an evolution period during which the cholesteric liquid crystal is made to transition to the state selected during the selection period; and controls the applied voltage to the cholesteric liquid crystal during the evolution period to change in accordance with temperature.

Abstract: A liquid crystal display device includes a segment driver, a common driver, and a voltage setting unit. The voltage setting unit derives a voltage at which a previous drive line becomes a focal conic state regardless of image data by applying a synthesized voltage of a voltage that is applied from the segment driver and a voltage that is applied from the common driver to the previous drive line. Then, the voltage setting unit sets the voltages that are applied from the segment driver and the common driver on the basis of the derived result.

Abstract: A display apparatus includes a cholesteric liquid crystal display panel, a control circuit and a driving circuit. The control circuit classifies pixels into different gradation level groups. The driving circuit applies a first driving waveform to the cholesteric liquid crystal display panel to bring pixels belonging to the first and the fourth group into a state corresponding to the highest gradation level, pixels belonging to the second group into a state corresponding to the lowest gradation level, and pixels belonging to the third group into states corresponding to gradation levels to be displayed, and applies a second driving waveform to the cholesteric liquid crystal display panel to bring pixels belonging to the fourth group into states corresponding to gradation levels to be displayed.

Abstract: A method of driving a liquid crystal display element that applies an AC pulse voltage to drive liquid crystal includes: when the temperature of the liquid crystal is higher than a reference temperature, generating the AC pulse voltage for high temperature having a pulse width that is shorter than a reference pulse width of a reference AC pulse voltage used at the reference temperature; and applying the generated AC pulse voltage to the liquid crystal in a period that is equal to the reference pulse width.

Abstract: A display apparatus comprising: a display device comprising a cholesteric liquid crystal layer and electrodes sandwiching the cholesteric liquid crystal layer and applying a voltage to a pixel; a voltage driver capable of applying a first pulse and a second pulse to the electrodes, the first and second pulses having different polarities; and a directing circuit directing the voltage driver as to a position to which the first pulse is to be applied and a position to which the second pulse is to be applied in a predetermined period according to a gray level to be produced in the pixel.

Abstract: A cholesteric liquid-crystal display device includes a cholesteric liquid-crystal display element having common electrodes and segment electrodes; a common driver which drives the common electrodes, outputs a selected-line voltage to a selected line of the common electrodes, and outputs an unselected-line voltage to unselected lines other than the selected line; a segment driver which drives the segment electrodes and outputs a write signal to the segment electrodes; a drive controlling circuit which controls the common driver and the segment driver to rewrite an image displayed on the cholesteric liquid-crystal display element; and a voltage correcting circuit which corrects the unselected-line voltage corresponding to the write signal during writing to the selected line.

Abstract: A display device includes a display element and a drive circuit that drives the display element, in which the drive circuit outputs a reset pulse that changes an orientation state of liquid crystal into a first orientation state, a selection pulse that changes the first orientation state into a second orientation state by combinations of a plurality of pulses in accordance with gradation data of an image to be displayed, and a maintenance pulse that maintains the second orientation state.

Abstract: A display device includes a display part, an electrode that applies a pulse to a pixel of the display part, and a control part that controls the application of the pulse, the control part controls the position of the electrode that applies the pulse so as to change at irregular intervals. The control part selects the position of the electrode that applies the pulse alternately from the center toward both ends and densely at the center and sparsely at both ends, or alternately from both ends toward the center and densely at both ends and sparsely at the center and thus selects all the electrodes.

Abstract: A liquid crystal display device includes a segment driver, a common driver, and a voltage setting unit. The voltage setting unit derives a voltage at which a previous drive line becomes a focal conic state regardless of image data by applying a synthesized voltage of a voltage that is applied from the segment driver and a voltage that is applied from the common driver to the previous drive line. Then, the voltage setting unit sets the voltages that are applied from the segment driver and the common driver on the basis of the derived result.

Abstract: A voltage supply circuit includes a switching circuit to switch among a plurality of driving voltages including a first driving voltage and a second driving voltage lower than the first driving voltage based on an operation mode of a display apparatus and control at least one of a switching speed and a switching timing so that one of a first switching speed and a first switching timing to the first driving voltage becomes faster than a corresponding one of a second switching speed and a second switching timing to the second driving voltage.

Abstract: A driving method of a display device includes: supplying a first drive voltage from a first circuit, which is driven using a first power-supply voltage from a first power source, and a second drive voltage from a second circuit, which is driven using a second power-supply voltage from a second power source that is lower than the first power-supply voltage; causing a driver circuit section that drives a display element to charge, using the second drive voltage, a display element in a non-selected region in a display element section that includes a plurality of display elements; maintaining a voltage of the display element in the non-selected region, using the second drive voltage.

Abstract: A liquid crystal driving device includes a plurality of scan electrodes; a signal electrode arranged along a direction that intersects with the plurality of scan electrodes and forms a pixel for each intersection with the plurality of scan electrodes; and a control circuit configured to set a drawing line that is made up of series of the pixels, and a plurality of pre-drive lines that are different from the drawing line along a direction in parallel with the scan electrode and supplies image data that corresponds to the drawing line from the signal electrode while shifting the drawing line and the plurality of pre-drive lines to a direction that intersects with the scan electrode. The control circuit discretely drives the plurality of pre-drive lines.

Abstract: A display device selects one or more of first electrodes corresponding to image data using a general-purpose segment driver and applies predetermined voltages respectively to the first electrodes of selection targets and non-selection targets. A driver control circuit outputs, according to a pulse polarity control signal, inverted image data or un-inverted image data to a segment driver. The segment driver applies voltage to second electrodes based on the image data acquired from the driver control circuit.

Abstract: A display apparatus includes a cholesteric liquid crystal display panel, a control circuit and a driving circuit. The control circuit classifies pixels into different gradation level groups. The driving circuit applies a first driving waveform to the cholesteric liquid crystal display panel to bring pixels belonging to the first and the fourth group into a state corresponding to the highest gradation level, pixels belonging to the second group into a state corresponding to the lowest gradation level, and pixels belonging to the third group into states corresponding to gradation levels to be displayed, and applies a second driving waveform to the cholesteric liquid crystal display panel to bring pixels belonging to the fourth group into states corresponding to gradation levels to be displayed.

Abstract: A display device includes: a display element of a dot matrix type; a row driver that drives a row electrode of the display element; a column driver that drives a column electrode of the display element; and a multiple voltage power source that supplies a drive voltage to the row driver and the column driver, wherein: the row driver and the column driver are configured by a segment driver; and the device includes a power source switching switch which switches drive voltages to be supplied to the row driver in accordance with the polarity of an applied voltage to be applied to a pixel of the display element.

Abstract: A display device with low power consumption capable of canceling the collapse of gradation and skip of gradation in a high gradation part and a low gradation part and of displaying an even gradation in a wide range has been disclosed. The display device comprises a display element of dot matrix type having a display material with memory properties, a drive circuit that drives a pixel of the display element, and a control circuit that controls the drive circuit, wherein the control circuit executes an initialization step for applying a voltage pulse to initialize a pixel to be rewritten to bring the pixel into an initialization state and a gradation step for applying a voltage pulse to change the gradation state of a pixel, and in the gradation step, an alternating voltage pulse is formed in a pixel to be rewritten and the period and voltage of the alternating voltage pulse are varied in accordance with a gradation to be written.

Abstract: A drive circuit of a liquid crystal display device includes a driver circuit that applies a voltage pulse to a liquid crystal of the liquid crystal display device, and a control circuit that controls the driver circuit to change the liquid crystal to a initial tone and to change the initial tone to a high tone, an intermediate tone, or a low tone. The control circuit sets a tone energy difference so as to be smaller at the intermediate tone than at the high tone close to the initial tone, the tone energy difference being a difference between an application energy of the voltage pulse applied to the liquid crystal of the initial tone to display a predetermined tone and an application energy of the voltage pulse applied to display a tone different from the predetermined tone.

Abstract: A method of driving a liquid crystal display element that applies an AC pulse voltage to drive liquid crystal includes: when the temperature of the liquid crystal is higher than a reference temperature, generating the AC pulse voltage for high temperature having a pulse width that is shorter than a reference pulse width of a reference AC pulse voltage used at the reference temperature; and applying the generated AC pulse voltage to the liquid crystal in a period that is equal to the reference pulse width.

Abstract: To provide a technology for preventing, by a simple input operation, a password from being leaked out even if an input operation thereof is peeped by a third party. A plurality of characters different for each input are presented, an input of a processing result about the characters is received, and authentication is made by checking whether or not a result of executing the process as the password stored beforehand on a storage unit about the characters corresponds to the inputted processing result.