113results about How to "Lower refresh rate" patented technology

A memory (10) includes a variable refresh control circuit (20) for controlling the refresh rate of a memory array (12) using a capacitor for data storage. In one embodiment, each test cell of a plurality of test memory cells (30, 32, 34, and 36) is refreshed at different rates. A monitor circuit (18) is provided for monitoring the stored logic state of each of the plurality of test memory cells, and in response, adjusting the refresh rate of the memory array (12). In another embodiment, a variable refresh control circuit (20′) includes a plurality of test memory cells (70, 72, 74, and 76) that are all refreshed at the same rate but each of the test memory cells (70, 72, 74, and 76) is implemented to have a different charge storage capacity than the other test memory cells. The monitor circuit (18) monitors the stored logic state of each of the plurality of test memory cells (70, 72, 74, and 76), and in response, adjusts a refresh rate of the memory array (12).

A dynamic random access memory (“DRAM”) device is operable in either a normal refresh mode or a static refresh mode, such as a self-refresh mode. A cell plate voltage selector couples a voltage of one-half the supply voltage to the cell plate of a DRAM array in a normal refresh mode and in the static refresh mode when memory cells are being refreshed. In between refresh bursts in the static refresh mode, the cell plate voltage selector couples a reduced voltage to the cell plate. This reduces the voltage reduces the voltage across diode junctions formed between the source/drain of respective access transistor and the substrate. The reduced voltage reduces the discharge current flowing from memory cells capacitors, thereby allowing a reduction in the required refresh rate and a consequential reduction in power consumption.

An angle-responsive sensor, comprising:

• • a radiation detector adapted to detect ionizing radiation;
  • at least one radiation absorbing element arranged to block radiation from reaching said detector in a manner dependent on a relative orientation of a radiation source, said detector and said element, said detector and said element defining an aim for said sensor; and
  • circuitry coupled to said detector and which generates an output signal which varies as a function of said relative orientation,
  • wherein said detector and said element are arranged to have a working volume of at least 10 cm in depth and having an angular width, such that said signal defines an accuracy of better than 3 mm within one standard deviation, over said working volume.

A memory cell includes a capacitor that includes a first metal layer and a second metal layer. The capacitor includes a ferroelectric layer disposed between the first metal layer and the second metal layer. The ferroelectric layer is a single layer of a bi-stable asymmetric crystalline material.

The invention discloses a liquid crystal display (LCD) apparatus and a brightness/luminance holding ratio compensation method. A backlight module of the LCD apparatus may form a plurality of backlight shield-blocking periods in a display frame cycle or adjust output brightness gradually, for compensating a brightness/luminance bias caused by a transmittance variance of liquid crystal cell in the low refresh rate driving LCD apparatus, so as to avoid some abnormal display effects, such as screen flicker. Besides, the LCD apparatus has better energy efficiency by utilizing a low-voltage gray level driving method or saving the power consumption of the backlight module.

A method of driving a liquid crystal display and a drive circuit for a liquid crystal display module wherein the liquid crystal display of the liquid crystal display module is controlled and the image data displayed by the liquid crystal cells is refreshed. Received frames of image data are analysed to determine if individual frames of image data have characteristics prone to showing flicker. The refresh rate is reduced if the image analysis determines that the frames received of image data do not have characteristics prone to showing flicker.

To suppress deterioration of quality of a still image displayed with a reduced refresh rate. A liquid crystal display device includes a display portion that is controlled by a driver circuit and includes normally white mode (or normally black mode) liquid crystals, and a timing controller for controlling the driver circuit. The timing controller is supplied with an image signal for displaying a moving image and an image signal for displaying a still image. The absolute value of a voltage applied to the liquid crystals in order to express black (or white) in an image corresponding to the image signal for displaying the still image is larger than that of a voltage applied to the liquid crystals in order to express black (or white) in an image corresponding to the image signal for displaying the moving image.

The invention provides a regulating circuit and a regulating method capable of reducing power consumption of a screen. The regulating method comprises the steps of reading pixel values of current frame and previous frame from a frame storage unit by a difference calculation unit, calculating frame difference information, and sending to a frame difference storage unit; storing M pieces of frame difference information and sending the stored frame difference information of the current frame and the previous (N-1)th frame to a display scene judgment unit by the frame difference storage unit, and judging current display scene according to the frame difference information of the current frame and the previous (N-1)th frame and the configuration information and sending a judgment result to a display frame rate control unit and a display control unit frequency controller by the display scene judgment unit; and regulating the display frame rate by the display frame rate control unit according to the configuration information and the judgment result to change the refreshing rate, and regulating the working frequency of the display control unit by the display control unit frequency controller. According to the invention, the refreshing rate of the display screen and the working frequency of a display control circuit can be dynamically regulated according to different display scenes.

A computerized system 40 for locating a device. System 40 includes a sensor module 20 and a CPU 42. A radioactive source 38, associated with the device, produces a signal in the form of radioactive disintegrations. Module 20 includes a radiation detector 22 capable of receiving a signal from source 38 attached to the device. Module 20 produces an output signal 34. CPU 42 receives output signal(s) 34 and translates output 34 into directional information relating to a position of source 38.

An object is to suppress deterioration of a displayed image even when a refresh rate is reduced in displaying a still image. A liquid crystal display device includes a pixel transistor electrically connected to a pixel electrode, and a capacitor having one electrode electrically connected to the pixel electrode and the other electrode electrically connected to a capacitor line. The pixel transistor is turned on and a voltage based on an image signal is supplied to the pixel electrode, and then, the pixel transistor is turned off so that a holding period during which the pixel electrode holds the voltage based on the image signal starts. A holding signal corresponding to change of the voltage based on the image signal in the pixel electrode in the holding period is supplied to the capacitor line so that a potential of the pixel electrode is constant.

The invention discloses a multi-line scanning high-refresh-rate full-color LED driving chip and a driving method, and belongs to the field of full-color LED driving chip design. The multi-line scanning high-refresh-rate full-color LED driving chip comprises a synchronous controller, a shift register, a state register, an SRAM buffer, a gray clock generation module, a driving module, a pre-charging circuit and an analog output module. The gray scale clock generation module is used for carrying out frequency multiplication/frequency division processing on the data clock signal DCLK according to the instruction information so as to generate a gray scale clock signal GCLK for controlling the gray scale. The driving module is used for counting the gray scale clock signal GCLK to obtain gray scale counting corresponding to each row of pixel data, and generating an output waveform of a PWM signal corresponding to each row of pixel data by using N continuous rows of pixel data and the corresponding gray scale counting in each scanning process, so that multi-row scanning is realized. The analog output module is used for receiving the PWM signal and generating constant current to drive the LED lamp bead in cooperation with the pre-charging circuit. According to the chip, the refresh rate can be improved, and more scanning lines can be supported.

The invention provides an interactive low power consumption live broadcasting and recorded broadcasting system and method for teaching. The student side adopts a special low power consumption interaction terminal, and is provided with a live broadcasting control all-in-one machine; the live broadcasting control all-in-one machine can acquire audio and video streaming media, course and teaching plan pictures or files and attached media file for time axis synchronization, generate a real-time coarse data stream, and upload the real-time coarse data stream to a live broadcasting and recorded broadcasting center server; the live broadcasting control all-in-one machine further acquires the coarse data stream from the live broadcasting and recorded broadcasting center server for demultiplexing, enables the audio and video streaming media and the attached media files to reappear, and pushes the course and teaching plan pictures or files to the low power consumption interaction terminal for synchronous displaying. The system further realizes interaction between interacting contents and interacting messages. The invention provides a two-dimensional time axis synchronization technology based on an intensive timestamp and the content overlap ratio, and synchronous association of the interacting contents, the interacting messages and the real-time coarse data stream is realized.

A driving method for a display is provided. This display includes a first driver, a second driver, a plurality of first signal lines coupling with the first driver, and a plurality of second signal lines coupling with the second driver. The first lines cross the second lines to form a pixel array with a plurality of pixels. The driving method includes the following steps. First, an image signal with a polarity is applied to the pixel array. The polarity is a first polarity or a second polarity opposite to the first polarity. Then, the image signal applied to at least one pixel of the pixel array is maintained in a same polarity during two successive frames.

The invention provides a detecting method and a device of pixel charging compensation, its compensation method and a display device. The detecting method includes steps of classifying a display zone of the display device into at least two compensation zones, and detecting the first brightness of a target pixel in every compensation zone; calculating the compensation time of charging the pixel in the compensation zone where the target pixel locates according to the differential value of the first brightness and the preset brightness. Thus, after compensating the pixel charging time in the compensation zone by the detected compensation time, the charging time of every pixel is approximately the same, so that the charging difference of pixels on different positions caused by the improvement of resolution rate, pixel density and image refreshing rate and delay of the signal line is reduced, the charging uniformity and sufficient charging time of pixels at different positions are guaranteed; besides, the brightness of different positions on the display zone of the display device is uniform.

A multiplex electrophoretic display driver circuit comprises a memory unit, a display controller and a voltage driving unit. The memory unit has two registers respectively storing the current and former gray-level matrix signals. The gray-level matrix signal contains gray-level data corresponding to electrophoretic pixels. The display controller has an encoding circuit and a counting circuit. The encoding circuit generates a difference-value matrix signal containing difference values according to a difference between the current and former gray-level matrix signals and then generates a voltage-difference matrix signal containing voltage-difference signals corresponding to the electrophoretic pixels. The counting circuit receives the difference-value matrix signal and counts to generate refreshing values corresponding to the difference values. The encoding circuit adds the refreshing values to a next-cycled difference-value matrix signal to generate a new voltage-difference matrix signal. The voltage driving unit drives the electrophoretic pixels according to the voltage-difference matrix signal.

A display control apparatus and a display control method are provided in which a resolution of an input image signal is judged, a change in the image signal is detected, and the image signal is adaptatively interpolated in accordance with the judgement and detection results. A resolution of an input image signal is judged, either a first display mode or a second display mode is selected for the display of the image signal, and the image signal is adaptatively interpolated in accordance with the judgement and selection results. Alternatively, either a computer input signal or a television input signal is input, a resolution of the input signal is judged, and the input signal is adaptatively interpolated in accordance with the selected input and judgement results.

One embodiment of the invention discloses a method and device for controlling a mobile terminal and a mobile terminal. The method comprises obtaining layer content of a currently displayed layer; determining an object satisfying a set condition according to the layer content, wherein the set condition is that the attention on the object by a user is lower than a threshold and the object comprises layers, application programs or interface elements; using a set processing mode to perform power consumption reduction processing on the object, wherein the processing mode comprises at least one of reducing the drawing frame rate of the object, reducing the synthesis frame rate of the object, reducing the refresh rate of the area where the object is located and reducing the resolution of the object. By means of the method and the device of the invention, power consumption on objects having less attention from users can be reduced so as to reduce power consumption of terminals and give consideration to display effects, therefore increasing the endurance of terminals.

The required refresh rate of a DRAM is reduced by biasing active digit lines to a slight positive voltage to reduce the sub threshold current leakage of access transistors in memory cells that are not being accessed. The slight positive voltage is provided by a voltage regulator circuit using one or more bipolar transistors fabricated in a well that electrically isolates the bipolar transistors from the remainder of the substrate. The voltage provided by the voltage regulator is preferably coupled to the access transistors by powering each of the n-sense amplifiers in the DRAM with the voltage from the voltage regulator.

Provided are a liquid crystal display device and a drive method thereof, capable of promptly making an afterimage, which is visually recognized at refresh time, visually unrecognizable and reducing power consumption during and after a shift to a target refresh rate. At pause drive time until a target refresh rate is reached, a refresh is performed in divided periods of a first refresh period for performing a refresh at least twice, and a second refresh period for performing a refresh while increasing the number of frames in a non-refresh period from a refresh rate at the end of the first refresh period until the refresh rate becomes the target refresh rate, and the second refresh period is finished when the refresh rate in the second refresh period reaches the target refresh rate, and the pause drive is continued at the target refresh rate.