Abstract: Embodiments herein describe a touch panel controller that has a first mode and a second mode. The touch panel controller performs a normal scan in the first mode, and performs a low-power scan in the second mode. In the normal scan, all of detection points are targeted for detection on a touch detection plane of a touch panel. In the low-power scan, only every other electrode in a group of electrodes is used to generate detection data.

Abstract: Low power consumption is realized focusing on the refresh interval of a low leakage display panel. Display systems and microcomputers are described herein. One embodiment of a display system includes a display driver. The driver receives an enable signal from the outside, stops the display operation of an internal circuit in an inactive state of the enable signal, and resumes the display operation of the internal circuit in an active state. Instead of the enable signal, a command supplied from the outside may be used. When resuming the display operation, the display driver performs control to make the start timing of the display operation earlier for a circuit that requires a long time for activation. A microcomputer that outputs an enable signal or a command controls the output or the output stop of display data according to the state of the enable signal or the command.

Abstract: The driving device used for drive control of a driven device having driven elements arranged to commonly receive a common voltage at common terminals and individually receive drive signals at data terminals has: a drive voltage-producing circuit which produces drive voltages; a driver circuit which accepts input of the drive voltages produced by the drive voltage-producing circuit and outputs, as drive signals, signals selected from the drive voltages according to drive data from data output terminals in parallel; and a common voltage-producing circuit which produces a common voltage to output from a common-voltage-output terminal. In the driving device, the drive voltage-producing circuit detects a change in the common voltage output from the common-voltage-output terminal, and changes the drive voltages in the direction of the change.

Abstract: A semiconductor device includes first to sixth external connection terminals, a first receiver connected to the first and second external connection terminals, a second receiver connected to the third and fourth external connection terminals, a third receiver connected to the fifth and sixth external connection terminals, a C-PHY block, a D-PHY block and a main processing section. The C-PHY block is configured to generate first reception data by performing signal processing on signals received from the first, second and third receivers in accordance with the MIPI C-PHY specification. The D-PHY block is configured to generate second reception data by performing signal processing on signals received from the first, second and third receivers in accordance with the MIPI D-PHY specification. The main processing section is configured to selectively receive the first and second reception data and perform desired processing on the received data.

Abstract: A display device includes a display panel and a display driver driving the display panel. The display driver is connected to a host with a clock lane and at least one a data lane. The display driver includes: an interface circuit configured to receive an external clock signal from the host via the clock lane, receive a data signal from the host via the data lane, and output reception data transmitted over the data signal; a control circuit configured to output an internal clock signal synchronous with the external clock signal; and a drive circuitry configured to drive the display panel in response to image data included in the reception data in synchronization with the internal clock signal fed from the control circuit. The control circuit is configured to feed the internal clock signal in response to a type of a reception packet included in the reception data.

Abstract: A display panel driver includes an image data generator, a brightness correction circuit performing a correction calculation on image data, a drive section driving the display panel in response to corrected image data; and a display timing generator outputting a timing control signal. The correction calculation by the brightness correction circuit is adjustable. When the display panel driver is placed into a test mode, the display timing generator is configured to output an internally-generated timing control signal and the image data generator outputs internally-generated evaluation image data. The evaluation image data are generated so that the evaluation images are switched from one to another in response to the internally-generated timing control signal.

Abstract: A semiconductor device has a first mode in which the semiconductor device is used alone and a second mode in which the semiconductor device is used in combination with another semiconductor device. Incase that one driven device is driven using the semiconductor device in the first mode and the second mode, power supply lines are caused to allow electrical conduction to each other outside of each semiconductor device in order to cancel errors of operation power supply voltages of each semiconductor device. In case that a power supply unit of each semiconductor device is operable by receiving an instruction for release of a low power consumption state, a supply start timing of the operation power supply voltages in the second mode is delayed as compared to that in the first mode.

Abstract: The touch detecting circuit is a capacitive detecting circuit correctable with a sensor capacitance, and includes an integration capacitance. In the touch detecting circuit, a sensor capacitance connected with the touch detecting circuit is charged and discharged; electric charges to input and output for charging and discharging the sensor capacitance are cumulatively added to the integration capacitance. The electric charges to he added to the integration capacitance are inverted in polarity according to directions of charge transfer accompanying the charge and discharge. Not only when charging the sensor capacitance, but also when discharging the sensor capacitance, the absolute values of electric charges to be moved are integrated and therefore, the amount of signals is doubled.

Abstract: Techniques for displaying a quality-improved image with reduced power consumption are provided. In one embodiment, a display panel driver is provided that includes a dithering section configured to receive first m-bit image data and configured to generate second image data by performing dithering on the first image data with n-bit dither values each selected from elements of a dither table, and a driver circuit configured to drive the source lines of a display panel in response to the second image data. In generating the second image data corresponding to first pixels belonging to a first pixel column, the dither values are selected from elements in a first column of the dither table, while the second image data corresponding to second pixels belonging to a second pixel column adjacent to the first pixel column, the dither values are selected from elements in a second column of the dither table.

Abstract: A display panel driver includes: a correction calculation section which performs correction calculations on input image data to generate saturation-enhanced output image data and a drive circuitry driving the display panel in response to the output image data and a starting point control section. The correction calculation section generates red (R) data, green (G) data and blue (B) data of the output image data by performing the correction calculations on R data, G data and B data of the input image data, respectively. The starting point control section controls the positions of starting points of the input-output curves of the correction calculations.

Abstract: A semiconductor chip tray is provided that includes a support plate, a first protruding portion, a second protruding portion and a recess. The first protruding portion forms a housing space for a semiconductor chip by being provided on a top surface of the support plate. The second protruding portion is provided on a bottom surface of the support plate, and is fitted to an outer periphery of the first protruding portion of another semiconductor chip tray when the tray is stacked so as to overlap the other tray. The recess is provided on the bottom surface of the support plate. The recess faces a part of the first protruding portion of another chip tray when the tray is stacked so as to overlap the other tray. The recess is formed extending up to an outside of the first protruding portion from the housing space formed by the first protruding portion.

Abstract: In a semiconductor device in which a reference voltage is generated by a reference voltage generation circuit, and the same reference voltage generated is used in a plurality of circuit units for the purpose of generating a voltage, a sampling and holding circuit of the reference voltage is provided in order to provide a standard voltage to the circuit units. A sampling and holding control circuit that controls the sampling and holding circuit instructs the sampling and holding circuit to perform a sampling operation of the reference voltage in case that the semiconductor device operates in a state where power supply noise of the reference voltage generation circuit falls within a predetermined range, and instructs the sampling and holding circuit to perform a holding operation of the reference voltage in case that the semiconductor device operates in a state where the power supply noise exceeds the predetermined range.

Abstract: A display device includes a display panel; and a display panel driver driving the display panel. The display panel driver includes: a processing circuit configured to perform digital arithmetic processing on R, G and B grayscale values of input image data to calculate R, G and B grayscale values of output image data, respectively, and a control point data generation circuit configured to: generate first control point data indicating the shape of a desired gamma curve; calculate Re, G and B control point data indicating input-output curves of digital arithmetic processing performed on the R, G and B grayscale values of the input image data by correcting the first control point data in response to the input image data. The processing circuit is configured to calculate the R, G and B grayscale values of the output image data in response to the R, G and B control point data.

Abstract: The semiconductor device cyclically outputs given status information pieces according to a predetermined procedure from a test output terminal one by one on receipt of a test enable direction through a test enable terminal, and outputs the same status information pieces as those output at that time from the test output terminal without interruption on receipt of a test disable direction. Operating the test enable terminal, the semiconductor device cyclically outputs status information pieces without the need for initial setting and further, outputs only desired status information without interruption.

Abstract: A touch panel control circuit includes a plurality of drive circuits which are connected to Y sensor electrodes, respectively, and which apply a plurality of pulses to a corresponding Y sensor electrode for every predetermined period, and a plurality of detection circuits which are connected to X sensor electrodes, respectively. Each of the detection circuits includes a switched capacitor circuit that continues sampling of a signal from each of the X sensor electrodes, to which the detection circuits are connected, not only at a timing that is in synchronization with the plurality of pulses that are applied to the Y sensor electrodes, but also at a timing at which the pulses are not applied to the Y sensor electrodes. For example, the switched capacitor circuit is an integration circuit, or an integration circuit with a finite impulse response (FIR) filter or an infinite impulse response (IIR) filter.

Abstract: The semiconductor device has a touch panel controller, a processor, and a display driver. The display driver has a memory circuit which rewritably stores control data for drive control of a display panel from outside the semiconductor device. The processor controls the touch panel controller based on a command provided from outside the semiconductor device, and accesses control data in the memory circuit for controlling internal parts of the semiconductor device. With the aid of the arrangement like this, the processor is allowed to control a touch panel based on the read control data fit to the control by the display driver, and to control, by writing control data, the display panel fit for a control condition of the touch panel.

Abstract: A display device includes a display panel including a display region and a driver driving each pixel of the display region in response to input image data. The driver calculates area characterization data indicating feature quantities of an image displayed in each of areas defined in the display region for each of the areas, based on the input image data and generates pixel-specific characterization data associated with each pixel by applying filtering to the area characterization data associated with the area in which each pixel is located and with areas adjacent to the area in which each pixel is located. The driver generates output image data associated with each pixel by performing a correction on the input image data associated with each pixel in response to the pixel-specific characterization data associated with each pixel and drives each pixel in response to the output image data associated with each pixel.

Abstract: Embodiments herein include a device, system, and method for periodically capturing sensing signals using one or more detection electrodes to generate data for detecting an object proximate to the detection electrodes. The sensing signals are captured during detection periods within periodic detection cycles where each of the detection cycles define a period of time between consecutive detection periods. In addition, the device, system and method set a duration of the detection cycle to 1/m (where m is appositive integer) of a duration of a display-scan cycle. The value of m is selected based on a periodic noise signal. Thus, the device, system, and method may prevent a periodic noise signal which has a cycle that is longer than the detection period from worsening the accuracy of touch detection.

Abstract: A display panel driver includes first and second scaler circuits and a pixel data feeding section which feeds to the first scaler circuit first divisional image pixel data corresponding to a first divisional image and feeds to the second scaler circuit second divisional image pixel data corresponding to a second divisional image. The pixel data feeding section also feeds to the first scaler circuit first boundary pixel data corresponding to pixels in a portion of the second divisional image, adjacent to the first divisional image and feeds to the second scaler circuit second boundary pixel data corresponding to pixels in a portion of the first divisional image, adjacent to the second divisional image. The first scaler circuit performs image scaling on the basis of the first divisional image pixel data and the first boundary pixel data and the second scaler circuit performs image scaling on the basis of the second divisional pixel image data and the second boundary pixel data.

Abstract: A touch detecting circuit is allowed to adaptively operate in accordance with an interconnection length to a sensor capacitor of an object to be detected. For example, the touch detecting circuit has a configuration capable of adjusting a threshold value for determination touch and non-touch or a configuration capable of adjusting detection sensitivity of a detection circuit that is connected to the sensor capacitor. For example, the touch detecting circuit has a configuration which includes an adjustment resistor that is connected in series to a signal line for input from the sensor capacitor at an input portion of the detection circuit, and which is capable of performing adjustment to cancel a difference in an interconnection resistance from a sensor capacitor on a far end side to a sensor capacitor on a near end side.