Abstract: To carry out a suitable correction process while preventing a cost increase, an image processing device includes a frame memory (120) configured to store image data for the current frame; and a correction section (130, 140) configured to correct an image for the current frame, the correction section being configured to correct the image for the current frame with reference to a frame previous to the current frame, the frame memory being configured to further store image data for the previous frame.

Abstract: Provided is a technique of making it possible to draw an image according to a locus of a finger or the like, irrespective of a frame rate. A display device intermittently performs image display and touch position detection, and controls a frame frequency so that the frame frequency is variable. The display device includes: a display panel that includes a plurality of gate lines, and a touch detection element for the touch position detection; a gate line driving unit for scanning the gate lines; a touch detection driving unit that detects a touch position on the display panel; and a control unit that controls a scanning frequency for the gate lines. The touch detection driving unit performs the touch position detection at a constant frequency. The control unit adjusts the scanning frequency for the gate lines in one vertical scanning period, based on the frame frequency and the frequency for the touch position detection. The gate line driving unit scans the gate lines in accordance with the scanning frequency.

Abstract: The present invention provides a data processing device connected with an intermission driving. The data processing device achieves a satisfactory power saving while ensuring a high level of display quality of the display device. Upon detection of non-data update in a frame buffer, the host calculates a next refreshing timing based on driving information obtained from a liquid crystal display device (LCD), sets a timer for a timeout after a length of time representing the calculated result, and then the host and the LCD shift to Intermission State 1. Thereafter, when the timer times out to bring the host back to Normal State and a data update at the frame buffer is detected, data for refreshing an display image in the LCD is transferred from the host to the LCD. If the amount of time representing the calculated result is longer than a predetermined baseline, a shift is made to Intermission State 2 which provides greater power saving than Intermission State 1.

Abstract: A display apparatus includes a source driver and a gate driver which drive a display section such that pixel signals are selectively supplied to a plurality of pixels provided in the display section. The display section includes a non-image visual recognition area, in which it is not possible for a visual recognizer to visually recognize an image to be displayed, and an image visual recognition area in which it is possible for the visual recognizer to visually recognize the image to be displayed. The source driver and the gate driver lower a driving rate which drives the non-image visual recognition area further than a driving rate which drives the image visual recognition area.

Abstract: The power consumption of an apparatus including a touch panel is reduced. In a touch panel control device (1) including a sensor drive section (22) and a liquid crystal drive controller (10), the sensor drive section (22) makes a detection sensitivity during a pause period lower than a detection sensitivity during an update period, the pause period being a period in which the liquid crystal drive controller (10) does not update the image that is displayed on a liquid crystal display panel (40), the update period being a period in which the liquid crystal drive controller (10) updates the image that is displayed on the liquid crystal display panel (40).

Abstract: Provided is a display device which makes less flicker perceived in transition from a pause period to a drive period by suppressing image luminance from changing. Regardless of whether the number of pause frames in an immediately preceding pause period is high, or whether there is an image change immediately after a transition from the pause period to a drive period, high-speed scans are performed from Operating Frame One through Operating Frame Three, and BC drive is performed during Operating Frames One and Two. As a result, image luminance change immediately after the transition from the pause period to the drive period can be suppressed in a short period of time, and therefore, the occurrence of flicker as perceived by the viewer can be suppressed. Moreover, high-speed scans are performed only from Operating Frame One through Operating Frame Three, and therefore, power consumption in a liquid crystal display device 1 can be reduced.

Abstract: There was a problem that it was difficult for a semiconductor device in the related art to increase the switching frequency of a step-up circuit, and it was difficult to stabilize an output current and an output voltage. A semiconductor device controls a step-up circuit including an inductor and a drive transistor to drive the inductor. The semiconductor device calculates upper and lower limits which determine the variable range of an input current, based on an output current and an input voltage, controls the switch timing of the drive transistor based on the relation between the upper and lower limits and the magnitude of the input current, and at the same time, corrects the upper and lower limits to be calculated, based on the magnitude of the difference between the output current and a target output current value as an ideal value of the output current.

Abstract: A frame memory 23 includes a first storage unit 231 for storing normal image data and a second storage unit 232 for storing reduced color image data. A reduced color image generation unit 122 generates the reduced color image data by performing a dithering process on the normal image data. A drive circuit of a liquid crystal panel 11 drives the liquid crystal panel 11 based on the normal image data stored in the first storage unit 231 in a normal mode, and drives the liquid crystal panel 11 based on the reduced color image data stored in the second storage unit 232 in a reduced color mode. In the reduced color mode, supplying a power supply voltage to the first storage unit 231 is stopped. When switching to the normal mode, supplying the power supply voltage to the first storage unit 231 is started, and the drive circuit drives the liquid crystal panel 11 based on the reduced color image data stored in the second storage unit 232 until the normal image data is written to the first storage unit 231.

Abstract: In the present invention, occurrence of abnormality such as display misalignment at the time of image update is prevented even when pause drive is performed in a display device where data signal lines are driven by a plurality of driver ICs. In a liquid crystal display device which includes a master IC (300L) and a slave IC (300R) as driver ICs and performs pause drive, upon detection of refresh start timing by a REF (Half) of the master IC (300L), the master IC (300L) transmits a refresh control signal RfC to the slave IC (300R), and upon receipt of a refresh detection signal RfD indicating refresh start timing detected by a REF (Half) of the slave IC (300R), the master IC (300L) transmits the refresh control signal RfC to the slave IC (300R) as well as starts refreshing on the left active area based on data in a 1/2 RAM (306L). Upon receipt of the refresh control signal RfC, the slave IC (300R) starts refreshing on a right active area based on data in a 1/2 RAM (306R).

Abstract: Provided are a liquid crystal display device capable of keeping power consumption low and preventing a polarity bias, and a method for driving the same. In a liquid crystal display device (100), for example, when five forced refreshes are performed, a special refresh, which involves no polarity inversion, is performed as one of the five, provided that an occurrence rate of a limit refresh during a Y-frame period, which is set to be a given period of time, exceeds a predetermined threshold. Accordingly, a polarity bias value Nb approaches “0”, whereby the need to perform a further limit refresh is eliminated, resulting in a decreased number of refreshes. Thus, the total power consumption by refreshes during a limit refresh period T3 can be made lower than can be conventionally made.

Abstract: A display device (1) in accordance with an embodiment of the present invention includes: an LCD driving section (20) and an LCD controller (30) for causing an image based on an image signal to be displayed on an LCD (10); and a CPU (40) for supplying an image signal to the LCD controller (30), the LCD controller (30) being configured to supply, to the CPU (40), a control signal that instructs the CPU (40) to supply an image signal, and the CPU (40) being configured to supply an image signal in a case where the CPU (40) receives a control signal.

Abstract: In a liquid crystal display device, a drive unit is controlled in a direction of eliminating a polarity bias of a data voltage corresponding to image data at a point of time when a refresh signal for updating an image displayed on a display unit by periodical refreshment or forced refreshment is generated, and the polarity bias is obtained for each of subsequent frame periods. In this manner, not only the polarity bias after the point of time when the refresh signal is generated is obtained so that the polarity bias at the point of time when the refresh signal is generated is eliminated, but also the polarity bias is repeatedly obtained in the same way every time the refresh signal is generated, and accordingly, the polarity bias can be prevented from being increased.

Abstract: An object of the present invention is to prevent occurrence of abnormality such as display misalignment at the time of image update even when pause drive is performed in a display device where data signal lines are driven by a plurality of driver ICs. In a liquid crystal display device which includes a master IC (300L) and a slave IC (300R) as driver ICs and performs pause drive, upon detection of refresh start timing by a REF (Half) of the master IC (300L), the master IC (300L) transmits a refresh control signal RfC to the slave IC (300R), and starts refreshing a left active area of a display portion. Upon receipt of a refresh detection signal RfD indicating refresh start timing detected by a REF (Half) of the slave IC (300R), the master IC (300L) transmits the refresh control signal RfC to the slave IC (300R), and starts refreshing the left active area of the display portion. Upon receipt of the refresh control signal RfC, the slave IC (300R) starts refreshing a right active area of the display portion.

Abstract: There was a problem that it was difficult for a semiconductor device in the related art to increase the switching frequency of a step-up circuit, and it was difficult to stabilize an output current and an output voltage. A semiconductor device controls a step-up circuit including an inductor and a drive transistor to drive the inductor. The semiconductor device calculates upper and lower limits which determine the variable range of an input current, based on an output current and an input voltage, controls the switch timing of the drive transistor based on the relation between the upper and lower limits and the magnitude of the input current, and at the same time, corrects the upper and lower limits to be calculated, based on the magnitude of the difference between the output current and a target output current value as an ideal value of the output current.

Abstract: In a liquid crystal display device, it is determined whether or not image data inputted from the outside has changed from image data of the previous frame by comparing those image data with respect to each line. As a result, when it is determined that the image data has changed, an entire screen is not rewritten, but image data from a top of a screen as a fixed position to a last line with the image data having changed are read from a frame memory and written into a pixel formation portion. Accordingly, of the screen for one frame, a screen from a top thereof to the last line where the image change has been detected is updated, and on subsequent lines, an image of the previous frame is continuously displayed.

Abstract: The present invention provides a data processing device connected with an intermission driving. The data processing device achieves a satisfactory power saving while ensuring a high level of display quality of the display device. Upon detection of non-data update in a frame buffer, the host calculates a next refreshing timing based on driving information obtained from a liquid crystal display device (LCD), sets a timer for a timeout after a length of time representing the calculated result, and then the host and the LCD shift to Intermission State 1. Thereafter, when the timer times out to bring the host back to Normal State and a data update at the frame buffer is detected, data for refreshing an display image in the LCD is transferred from the host to the LCD. If the amount of time representing the calculated result is longer than a predetermined baseline, a shift is made to Intermission State 2 which provides greater power saving than Intermission State 1.

Abstract: Provided are a liquid crystal display device and a driving method therefor that do not cause problems such as occurrence of flicker even when performing pause driving. When an off signal Soff instructing to turn off power is inputted, a polarity bias value W at the power-off is stored in a balance storage circuit. When the power is turned on again, the polarity bias value W is read from the balance storage circuit and provided to a balance control circuit. The balance control circuit starts insertion of a pause frame period to cancel out the polarity bias value W. By this, decrementing the polarity bias value W by “1” every insertion of a pause frame period is repeated. Then, at a point of time when the polarity bias value W becomes “0”, insertion of a pause frame period is ceased and normal pause driving is performed.

Abstract: A scanning line drive unit selects a plurality of scanning lines in order, and controls the operation of a thin-film transistors. A timing control unit controls the scanning line drive unit on the basis of a display signal that includes a horizontal synchronization signal, a vertical synchronization signal, and an image signal. The timing control unit is provided with: a first terminal to which the display signal is input; a second terminal to which a sub-synchronization signal, which is a signal other than the horizontal synchronization signal and the vertical synchronization signal, is input; and a notification unit that outputs a notification signal in a case where a period while only the sub-synchronization signal, among the horizontal synchronization signal, the vertical synchronization signal, and the sub-synchronization signal, is input is longer than a prescribed period.

Abstract: There was a problem that it was difficult for a semiconductor device in the related art to increase the switching frequency of a step-up circuit, and it was difficult to stabilize an output current and an output voltage. A semiconductor device controls a step-up circuit including an inductor and a drive transistor to drive the inductor. The semiconductor device calculates upper and lower limits which determine the variable range of an input current, based on an output current and an input voltage, controls the switch timing of the drive transistor based on the relation between the upper and lower limits and the magnitude of the input current, and at the same time, corrects the upper and lower limits to be calculated, based on the magnitude of the difference between the output current and a target output current value as an ideal value of the output current.

Abstract: Provided are a liquid crystal display device and a drive method thereof, capable of promptly making an afterimage, which is visually recognized during pause drive, visually unrecognizable while suppressing power consumption. When updated image data is transmitted, a first refresh is performed by used of this image data, and a refresh pauses based on Ref_int just in the next two-frame period. Then, the second and third refreshes are consecutively performed, and a refresh pause is repeated until the next updated image data is transmitted. In this case, since a refresh can be performed three times in a short period after reception of the updated image data, it is possible to make liquid crystal molecules oriented in a direction corresponding to an applied voltage in a short time and make an afterimage visually unrecognizable.