Abstract: A display device includes: a display panel including a sensor unit configured to detect a touch operation; a first control unit configured to supply a first signal to the display panel; and a second control unit configured to calculate touch information related to the touch operation and to supply the touch information to the first control unit. The first control unit includes: a signal generator configured to generate the first signal based on an image signal supplied from an external image signal supply source; and an overdrive circuit configured to perform a process of increasing an amplitude of the first signal generated by the signal generator. The overdrive circuit is actuated based on the touch information from the second control unit. The first control unit, in response to the actuation of the overdrive circuit, supplies the first signal having the amplitude increased by the overdrive circuit to the display panel.

Abstract: A display device is provided with: a display portion including a plurality of scanning lines, a plurality of data lines, and a plurality of pixel circuits; a scanning line drive circuit; and a data line drive circuit. The level of a data voltage applied to the data line decreases when a frame frequency is switched higher, and increases when the frame frequency is switched lower. This can prevent a display flicker when the frame frequency is switched. The level of the data voltage may change when the frame frequency is switched, and may return to its initial level over a plurality of frame periods. The timing of the control signal used to drive the display portion may change in accordance with the frame frequency to cause the length of the charging period of the pixel circuit to change in accordance with the frame frequency.

Abstract: A touch panel display driver includes a source driver circuit, a touch detection circuit, a selector circuit, a register a plurality of source terminals, a plurality of touch detection terminals, and a plurality of selection terminals. The selector circuit electrically connects the source driver circuit to each of the source terminals, electrically connects the touch detection circuit to each of the touch detection terminals, and electrically connects each of the selection terminals to the source driver circuit or the touch detection circuit.

Abstract: A display device includes: a display panel including a sensor unit configured to detect a touch operation; a first control unit configured to supply a first signal to the display panel; and a second control unit configured to calculate touch information related to the touch operation and to supply the touch information to the first control unit. The first control unit includes: a signal generator configured to generate the first signal based on an image signal supplied from an external image signal supply source; and an overdrive circuit configured to perform a process of increasing an amplitude of the first signal generated by the signal generator. The overdrive circuit is actuated based on the touch information from the second control unit. The first control unit, in response to the actuation of the overdrive circuit, supplies the first signal having the amplitude increased by the overdrive circuit to the display panel.

Abstract: A liquid crystal panel is provided which is capable of performing displaying with sufficiently high quality while reducing power consumption. The liquid crystal panel 20 includes a plurality of pixel electrodes, a plurality of counter electrodes which are smaller in number and larger in individual size than the plurality of pixel electrodes, a liquid crystal layer disposed between the plurality of pixel electrodes and the plurality of counter electrodes, and a control unit configured to control a voltage applied to the plurality of pixel electrodes and a voltage applied to the plurality of counter electrodes. In a predetermined case, the control unit operates in a power saving operation mode in which the control unit performs control such that a fixed voltage is applied to the plurality of pixel electrodes and a voltage corresponding to an image signal is applied to the plurality of counter electrodes.

Abstract: A liquid crystal panel is provided which is capable of performing displaying with sufficiently high quality while reducing power consumption. The liquid crystal panel 20 includes a plurality of pixel electrodes, a plurality of counter electrodes which are smaller in number and larger in individual size than the plurality of pixel electrodes, a liquid crystal layer disposed between the plurality of pixel electrodes and the plurality of counter electrodes, and a control unit configured to control a voltage applied to the plurality of pixel electrodes and a voltage applied to the plurality of counter electrodes. In a predetermined case, the control unit operates in a power saving operation mode in which the control unit performs control such that a fixed voltage is applied to the plurality of pixel electrodes and a voltage corresponding to an image signal is applied to the plurality of counter electrodes.

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: 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: 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: The present invention provides a data processing device connected with a display device performing intermission driving, in which power consumption of the display device is sufficiently reduced while securing high quality display by the display device. When a host shifts to Intermission State 2 together with an LCD without data updating in an image buffer in the host, the image buffer is extended (extended from 2 frames (A, B) to 4 frames (A-D)). Thereafter, when new display image data is supplied to the image buffer due to a user operation, a return instruction is transmitted from the host to the LCD. When stopped circuits in the LCD become operable, a return completion notification is sent from the LCD to the host. The host prevents frame missing by writing the new display image data into the image buffer in the extension state during the period of this returning, and transfers the new display image data to the LCD after receiving the return completion notification.

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: 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: When a SLEEPIN Command is inputted to the liquid crystal display device, the liquid crystal display device controls a source driver and a gate driver to generate an alternating current voltage and apply the generated alternating current voltage to a liquid crystal layer, in order to eliminate charge storage due to impurity ions distributed unevenly due to a polarity bias caused by a voltage applied to the liquid crystal layer until a point of time when the Command is inputted. In this manner, the liquid crystal display device shifts to a sleep period in a state where the charge storage due to the unevenly distributed impurity ions is eliminated. Therefore, when the liquid crystal display device resumes from the sleep period, generation of an afterimage due to burn-in of liquid crystal and generation of a flicker due to deviation of an optimum common voltage do not occur.

Abstract: There is provided a display device that is capable of suppressing occurrence of brightness drop which is caused by refresh of a display image during pause driving. In a normal driving mode, input image data (SsD0) according to a continuous tone method is supplied to a source driver (310) through a data selector (230) as an image signal (SsD) for driver. On the other hand, in a low-frequency driving mode in which pause driving is performed, the input image data (SsD0) is converted into dithered input image data (SsD1) by a dithering processing circuit (220), and is supplied to the source driver (310) through the data selector (230) as the image signal (SsD) for driver. A gradation of the dithered input image data (SsD1) is represented in a pseudo manner by an area coverage modulation method by using two values of a maximum value and a minimum value that can be taken as the gradation value of the input image data (SsD0).

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.