100results about How to "Reduce drive frequency" patented technology

A display device includes a scan driver transmitting a plurality of scan signals to a plurality of scan lines, a data driver transmitting a plurality of data signals to a plurality of data lines, a display unit including a plurality of pixels connected to corresponding scan lines and corresponding data lines, and respectively receiving the corresponding data signal when the plurality of pixels are selected with the corresponding scan signal, and a timing controller controlling the scan driver and the data driver, dividing one frame period into a first viewpoint image display period, a second viewpoint image display period, and a black image display period, and generating image data signals corresponding to the first viewpoint image display period, the second viewpoint image display period, and the black image display period, and supplying the respective image data signals to the data driver, wherein the black image display period is shorter than the first viewpoint image display period and the second viewpoint image display period, and the image data signal corresponding to the black image display period is a black image data signal controlling the plurality of pixels not to emit light.

It is an object to provide a semiconductor display device having a touch panel, which can reduce power consumption. The semiconductor display device includes a panel which is provided with a pixel portion and a driver circuit which controls an input of the image signal to the pixel portion, and a touch panel provided in a position overlapping with the panel in the pixel portion. The pixel portion includes a display element configured to perform display in accordance with voltage of the image signal to be input, and a transistor configured to control retention of the voltage. The transistor includes an oxide semiconductor in a channel formation region. The driving frequency of the driver circuit, that is, the number of writing operations of the image signal for a certain period is changed in accordance with an operation signal from a touch panel.

The invention discloses a bigrid-driven transversely arranged RGBW (Red Green Blue White) pixel structure, a driving method thereof and a display panel. The pixel structure comprises a plurality of pixel units in array repeated permutation, wherein each pixel unit comprises two main pixel areas, eight thin film transistors, two grid lines and four data cables; each main pixel area comprises four subsidiary pixel areas; each data cable is electrically connected with the source electrodes of the two thin film transistors, and different data cables are electrically connected with different thin film transistors; and the grid electrodes of the two thin film transistors electrically connected with the same data cable are respectively in electric connection with different grid lines. According to the embodiment of the invention, when the grid lines of the pixel structure scan pixels in different rows in the same frame, the potential polarity of a signal of each data cable is always unchanged, so that a reversion picture of the pixel points is obtained; and as the polarities of the data cables do not need to be frequently reversed, the driving frequency of the data cables is lowered, and accordingly, the power consumption of a panel is reduced.

A liquid crystal display device comprising a backlight and a pixel portion including first to 2n-th scan lines, wherein, in a first case of expressing a color image, first pixels controlled by the first to n-th scan lines are configured to express a first image using at least one of first to third hues supplied in a first rotating order, and second pixels controlled by the (n+1)-th to 2n-th scan lines are configured to express a second image using at least one of the first to third hues supplied in a second rotating order, wherein, in a second case of expressing a monochrome image, the first and second pixels controlled by the first to 2n-th scan lines are configured to express the monochrome image by external light reflected by the reflective pixel electrode, and wherein the first rotating order is different from the second rotating order.

A transistor whose channel region includes an oxide semiconductor is used as a pull down transistor. The band gap of the oxide semiconductor is 2.0 eV or more, preferably 2.5 eV or more, more preferably 3.0 eV or more. Thus, hot carrier degradation in the transistor can be suppressed. Accordingly, the circuit size of the semiconductor device including the pull down transistor can be made small. Further, a gate of a pull up transistor is made to be in a floating state by switching of on / off of the transistor whose channel region includes an oxide semiconductor. Note that when the oxide semiconductor is highly purified, the off-state current of the transistor can be 1 aA / μm (1×10−18 A / μm) or less. Therefore, the drive capability of the semiconductor device can be improved.

An object is to provide a semiconductor device with improved operation. The semiconductor device includes a first transistor, and a second transistor electrically connected to a gate of the first transistor. A first terminal of the first transistor is electrically connected to a first line. A second terminal of the first transistor is electrically connected to a second line. The gate of the first transistor is electrically connected to a first terminal or a second terminal of the second transistor.

An organic light emitting display is capable of reducing power consumption. The organic light emitting display includes a scan driver for sequentially supplying scan signals to scan lines, a data driver for supplying data signals to data lines in synchronization with the scan signals, pixels located at crossing regions of the scan lines and the data lines, a timing controller for determining a normal driving mode for displaying a normal image and a standby driving mode displaying less information than the normal image, and a power source for supplying a first power and a second power to the pixels, wherein a voltage difference between the first power and the second power in the normal driving mode is a first voltage, and a voltage difference between the first power and the second power is a second voltage different from the first voltage.

The invention discloses an LED backlight driving circuit. The LED backlight driving circuit comprises a boosting circuit, a current control module, a driving chip, a current detection module, a control signal module and a frequency adjusting module, wherein the boosting circuit is used for converting an input voltage into a required output voltage and providing the output voltage for an LED string light, the current control module is connected to the negative end of the LED string light and used for adjusting the working current of the LED string light, the driving chip is used for providing a first square-wave signal for the boosting circuit and providing a second square-wave signal for the current control module, the current detection module is used for detecting the working current of the LED string light and generating a detection signal, the control signal module receives the detection signal generated by the current detection module and generates a control signal, the frequency adjusting module receives the control signal generated by the control signal module and generates a resistance value according to the control signal, the frequency adjusting module is further connected to the driving chip, and the driving chip adjusts the driving frequency of the backlight driving circuit according to the resistance value. The invention further discloses a liquid crystal display with the backlight driving circuit.

A device of driving a light source for a display device is provided, which includes: a temperature sensor detecting a temperature near the light source; and an inverter controlling the light source depending on temperature information supplied from the temperature sensor. The inverter adjusts either or both of a driving frequency and a driving current of the light source depending on the temperature information. The inverter decreases the driving frequency when the detected temperature is lower than a first temperature, and the inverter increases the driving current when the detected temperature is lower than a second temperature lower than the first temperature.

The embodiment of the invention discloses a pixel circuit and a display device. The pixel circuit comprises a data voltage write-in module, a driving module, a storage module, a light emitting module and a leakage current suppression module. The data voltage write-in module is used for writing data voltage into the control end of the driving module. The storage module is used for storing data voltage of the control end of the driving module. The driving module is used for driving the light-emitting module to emit light according to the data voltage of the control end of the driving module. The leakage current suppression module is electrically connected with the control end of the driving module and is used for maintaining the potential of the control end of the driving module. The potential of the control end of the driving module is not easy to release in the light emitting stage, so that the potential of the control end of the driving module can be well maintained, and the display effect is improved. Moreover, the driving frequency of the pixel circuit can be reduced, and the power consumption of the whole display device comprising the pixel circuit is reduced. And the area of the storage module can be reduced, so that the pixel density can be improved.

An object of the present invention is to reduce the number of necessary terminals on a substrate, realize data transmission resistant to disturbance noise even when a source voltage of a logic system for processing a digital video signal is lowered, reduce an influence of a radiated noise, and provide an output image of high picture quality. For that purpose, a reflection type of liquid crystal display has a silicon substrate 1 as an active matrix substrate, uses the digital video signal for a video signal to be input, and converts the digital video signal into an analog video signal in the silicon substrate 1 to provide the output image. The reflection type of liquid crystal display having the above configuration has a DAC circuit 22 for converting the input digital video signal into the analog video signal; and an LVDS receiver 20 which receives each digital video signal that is to be input into the DAC circuit 22, through a LVDS transmission. The LVDS receiver 20 is mounted on the same silicon substrate 1 as the DAC circuit 22 is mounted.

The following semiconductor device provides high reliability and a narrower frame width. The semiconductor device includes a driver circuit and a pixel portion. The driver circuit has a first transistor including a first gate and a second gate electrically connected to each other with a semiconductor film sandwiched therebetween, and a second transistor electrically connected to the first transistor. The pixel portion includes a third transistor, a liquid crystal element, and a capacitor. The liquid crystal element includes a first transparent conductive film electrically connected to the third transistor, a second conductive film, and a liquid crystal layer. The capacitor includes the first conductive film, a third transparent conductive film, and a nitride insulating film. The nitride insulating film is positioned between the first transparent conductive film and the third transparent conductive film, and positioned between the semiconductor film and the second gate of the first transistor.

A fuel vapor treatment system is mounted on a hybrid vehicle having an internal combustion engine and an electric motor. Even when an internal combustion engine is stopped, a discharge of fuel vapor from a first canister to atmosphere can be detected. When the discharge of the fuel vapor from the first canister is detected, the internal combustion engine is started to perform a purge process. When it is detected that the purge process in the first canister is finished, the internal combustion engine is stopped to terminate the purge process.

The present invention provides a DC power supply apparatus and a compressor driving apparatus utilizing the DC power supply apparatus, the DC power supply apparatus includes; a three-phase AC power supply, a reactor, a bridge type rectifying circuit, a electrolytic capacitor, a double-direction switch, a capacitor, a phase detection unit of the specified phase for detecting each phase voltage, a controller of double-direction switch, the two-way switches are turned on / off every half cycle of each phase voltage of the three-phase AC supply to repeatedly and alternately charge and discharge the capacitors through the reactors, thereby reducing high frequency current components and improving the input power factor. Thus, a DC power supply apparatus reduces high frequency current and improves the input power factor by a simple circuit arragement.

Disclosed herein is an organic electro luminescence display panel provided with a pixel structure and a wiring structure which are adapted to an active matrix driving method; and driven by an electric potential asserted on each multi-consecutive-row bundle composed of adjacent power-supply lines, which are electrically tied to each other, each stretched in a horizontal direction and each used for supplying a driving current to an organic electro luminescence light emitting device employed in every pixel circuit of said organic electro luminescence display panel, to serve as an electric potential having two or more different magnitudes.

The liquid crystal display device includes a pixel portion including first and second regions and light sources. The first and second regions each include a liquid crystal element whose transmissivity is controlled in accordance with a voltage of an image signal and a transistor for controlling holding of the voltage, whose off-state current is extremely low. The light sources perform first and second drivings: lights whose hues are different from each other are sequentially supplied to the first region in a first rotating order and the lights are sequentially supplied to the second region in a second rotating order which is different from the first rotating order in the first driving; and a light having a single hue is supplied consecutively to one or both of the first and second regions in the second driving. The period for holding the voltage is different between the first and second drivings.

Disclosed herewith is a matrix driving method of liquid crystal which exhibits a cholesteric phase. In the method, there is a selection pulse application step of applying pulses to select the final state of the liquid crystal, and between the selection pulse application step of a scanning line and the selection pulse application step of the next scanned scanning line, a delay step is inserted. During the delay step, a signal pulse is of 0V or of a pulse voltage for a display of a specified density.

Liquid is ejected in a pulse-like manner from a nozzle provided at the distal end of a liquid ejection pipe. When the liquid is ejected, moving speed of the nozzle is detected. A driving frequency of a piezoelectric element is increased when the moving speed increase. The driving frequency is reduced when the moving speed decreases. Consequently, it is possible to prevent the number of times the liquid is ejected per unit length from changing according to the moving speed of the nozzle. Therefore, it is possible to excise a biological tissue at stable excision depth.

This disclosure relates to a technique for smoothly carrying out an acceleration operation and a deceleration operation for a vibration type actuator to prevent a situation where in starting the vibration type actuator, a drive frequency is reduced to become lower than a resonance frequency to stop the vibration type actuator. A first counter performs up-count from a first value to a second value larger than the first value at predetermined time intervals in accelerating the vibration type actuator. A rate multiplier outputs a clock signal having a frequency corresponding to the count value. A second counter measures a period of a pulse signal, the period being adapted to change in correspondence to a drive speed of the vibration type actuator, by counting the clock pulses. The drive speed of the vibration type actuator is controlled such that the measured pulse period becomes a predetermined target value.

A focus control device includes a lens unit including a focus lens; a focus lens driving mechanism that moves the focus lens to achieve an in-focus state; a focus status detector that detects a focus status acquired by the focus lens; a drive control unit that controls the focus lens driving mechanism so that the detected focus status is the in-focus state; a change detector that detects that an evaluation value for focus control has changed by a threshold value or more; and an execution control unit that waits in a state in which the drive control unit does not control the focus lens driving mechanism for a waiting time starting from a time when the change detector detects that the evaluation value has changed by the predetermined threshold value or more, and that causes the drive control unit to control the focus lens driving mechanism when the state in which the evaluation value has changed by the predetermined threshold value or more is maintained until the waiting time has elapsed.

The embodiment of the invention discloses a display panel and a display device. The display panel comprises an array substrate, wherein the array substrate comprises a substrate body, and multiple scanning lines and multiple data lines which are formed on the substrate body; the multiple scanning lines and the multiple data lines are crossed in an insulating manner to define multiple pixel units; the pixel units comprise pixel electrodes; at least one pixel unit comprises compensation electrodes which are insulated from the pixel electrodes of the pixel unit and are arranged on different layers; the perpendicular projections, located on the substrate body, of the compensation electrodes and the perpendicular projections, located on the substrate body, of the pixel electrodes are at least partially overlapped; the compensation electrodes of each pixel unit are electrically connected with the pixel electrodes of another pixel unit adjacent to the pixel unit in the extending direction of the data lines and / or the scanning lines, and the polarities of voltage signals on the pixel electrodes of every two adjacent pixel units in the extending direction of the data lines and / or the scanning lines are opposite. According to the embodiment of the invention, the voltage retention rate of the pixel electrodes in a display driving period is increased, and the display effect of the display panel during low frequency driving is enhanced.

The organic light emitting display includes a plurality of pixels positioned at intersections of scan lines, emission control lines, and data lines, a scan driver for sequentially supplying scan signals to the scan lines at a first driving frequency in order to select the pixels in units of horizontal lines, and an emission driver for sequentially supplying emission control signals to the emission control lines at a second driving frequency different from the first driving frequency in order to control emission of the pixels.

To provide a display device which can reduce driving frequency of a controller and a driver for inputting a signal to the display device and increase brightness of a screen without increasing the driving frequency. The display device includes: a display screen having a plurality of pixels provided by corresponding to intersection points between scan lines and data lines; a scan line drive circuit which drives the scan lines; a data line drive circuit which drives the data lines; and a display device body having an image display control device which operates the drive circuit so as to sequentially and repeatedly display two or more types of images. The image display control device causes the scan line drive circuit to simultaneously select two or more scan lines for at least one type of image among the two or more types of images sequentially displayed.

An object is to provide a semiconductor device with improved operation. The semiconductor device includes a first transistor, and a second transistor electrically connected to a gate of the first transistor. A first terminal of the first transistor is electrically connected to a first line. A second terminal of the first transistor is electrically connected to a second line. The gate of the first transistor is electrically connected to a first terminal or a second terminal of the second transistor.

A rotor includes four magnetic poles provided in a rotational direction at intervals of 90 degrees. A stator includes a winding group for rotation and a winding group for levitation. Each of the winding groups has concentrated windings spaced at intervals of 30 degrees in a rotational direction to provide induction conductive winding sections at twelve locations. Each two of the induction conductive winding sections spaced at an interval of 90 degrees among the twelve induction conductive winding sections are connected to form one winding set such that six winding sets are formed in total in each of the winding groups. Current for rotation and current for levitation are conducted through the six winding sets in the windings for rotation and levitation to perform rotation and levitation controls of the rotor.

A shift register, gate drive circuit and display panel are provided. The shift register includes a latch unit, a NAND gate unit, a buffer unit and a switch unit. The latch unit, the NAND gate unit and the buffer unit are configured to produce a scanning driving signal and a scanning stopping signal. The latch unit is configured to control the switch unit to be turned on so as to output the scanning driving signal or the scanning stopping signal from the output terminal of the shift register, or control the switch unit to be turned off so as to enable the output terminal of the shift register to float.