Sharp Kabushiki Kaisha Corporation

Daiji Kitagawa

Jin Miyazawa

Noriyuki Tanaka

Daisuke Suehiro

Kouji Kumada

Tatsuhiko Suyama

Atsushi Aoki

Yousuke Nakamura

Hiroyuki Ogawa

Yasuhiro Sugita

Mikihiro Noma

Takuya Sone

Masaaki Nishio

Toshiya Aoki

Tomotoshi Tsujioka

Masashi Mayumi

Hiroki Makino

Shuhichiroh Asatani

A memory liquid crystal display including a liquid crystal panel with a built-in touch panel is provided with a state control circuit configured to switch a state of a pixel electrode between a floating state and a non-floating state. A pulse signal for touch detection is supplied to a common electrode in a touch detection period. The state control circuit changes the state of the pixel electrode from the non-floating state to the floating state before the start of the touch detection period, and changes the state of the pixel electrode from the floating state to the non-floating state after the end of the touch detection period.

Liquid crystal display with in-cell touch panel preventing display defect during touch detection

There is achieved an electronic device including a position detector that can detect a touch position with high accuracy even when thickness reduction proceeds. A touch position detection method includes: a first determination step (S) of determining whether or not negative-value data is included in mutual capacitance detection data; a second determination step (S) of determining whether or not a mutual capacitance detection region and a self-capacitance detection region overlap; a third determination step (S) of determining whether or not the maximum value of the absolute value of negative-value data and the area of a negative-value data region are equal to or greater than thresholds; a correction step (S) of correcting the mutual capacitance detection data on the basis of self-capacitance detection data; and a touch position specification step (S) of specifying a touch position on the basis of the mutual capacitance detection data after the correction.

Electronic device provided with position detector and touch position detection method

A liquid crystal panel is provided which is capable of performing displaying with sufficiently high quality while reducing power consumption. The liquid crystal panelincludes 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.

Liquid crystal panel

In a memory liquid crystal display including a liquid crystal panel with a built-in touch panel, a black voltage or a white voltage is provided to a pixel electrode in accordance with a value of binary data stored in a memory circuit, and a display voltage generation circuit changes voltage values of the black voltage and the white voltage in synchronization with a continuous pulse voltage for touch detection in a touch detection period so that an absolute value of a voltage between the pixel electrode and a common electrode is maintained at a constant magnitude in each pixel circuit throughout a period from a point in time immediately before the start of the touch detection period to a point in time immediately after the end of the touch detection period.

Liquid crystal display device and method for driving same

A display device can extend a pause period by using a preset second setting period as a unit when a length of the pause period exceeds the second setting period. Further, detection of a touch position and specification of coordinates are interrupted when a vertical synchronization signal is received while specifying the coordinates of the touch position, and coordinates remaining in a coordinate calculation unit are discarded.

Display device with built-in touch panel and driving method therefor

A display controller controls changing timing of a waveform of each of gate clock signals (GCKGCK) so that a display driving operation is performed after the lapse of a relatively short time from a starting point of time of a horizontal scanning period in odd-numbered horizontal scanning periods (Ho), and that a display driving operation is performed after the lapse of a relatively long time from a starting point of time of a horizontal scanning period in even-numbered horizontal scanning periods (Ho). A touch panel controller outputs a pulse of a touch drive signal (STD) so that a position detection operation on a touch panel is started in a stable period after an end of the display driving operation in each of the odd-numbered horizontal scanning periods (Ho).

Display device and touch sensor with accurate touch detection and low power consumption

The present invention provides a display device, a method for producing a display device, and a method for inspecting a display device, which are capable of inspecting, after bonding of a display panel and a FPC to each other, a conductive line formed near an edge of the display panel and/or an edge of the FPC for open circuits, partial open circuits, and short circuits. The display device includes: a display panel; a flexible printed circuit connected to the display panel; and an inspection line formed along one or both of an edge of the display panel and an edge of the flexible printed circuit and including a capacitance-forming portion that exhibits capacitance.

Display device, method for producing display device, and method for inspecting display device

The power consumption of an apparatus including a touch panel is reduced. In a touch panel control device () including a sensor drive section () and a liquid crystal drive controller (), the sensor drive section () 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 () does not update the image that is displayed on a liquid crystal display panel (), the update period being a period in which the liquid crystal drive controller () updates the image that is displayed on the liquid crystal display panel ().

Touch panel control device and information processing apparatus

A touch panel display device includes an active matrix substrate and a control unit. The active matrix substrate is provided with gate lines, pixel electrodes connected to the gate lines, counter electrodes disposed to form a matrix, and touch sensor wires connected to the counter electrodes. The control unit alternately switches, during one frame period, between a gate scan period of scanning the gate lines and a sensor scan period of scanning the counter electrodes by a segment SEG and detecting electrostatic capacitance by. The one frame period includes a plurality of gate scan periods and a plurality of sensor scan periods. The control unit scans each of the segments in a first scan mode of completing touch detection of scanning all the segments in the one frame period a number of times other than an integer.

Display device with touch panel

A technique is provided that enables to reduce false detection on a touch panel, without limiting the time when the display panel is driven. In a touch-panel-equipped display device, a display control unitsequentially selects gate lines, and data signals are supplied to data lines, whereby a display panelis driven. A transmission circuitsupplies a pulse signal to transmission electrode portionsat timings based on a horizontal synchronization signal. A controllerdetects a contact position on the touch panel, based on output signals output from a reception circuit that correspond to capacitances between the transmission electrode portionsand reception electrode portions. The controlleradjusts the timings of supplying the pulse signal from the transmission circuitso that the point of time when the voltage of the pulse signal changes should not coincide with the period when noise of the display device due to the supply of data signals occurs.

Touch-panel-equipped display device

A touch panel is realized that is able to decrease the amount of dead space at the periphery of the touch panel and that has highly accurate touch panel sensitivity. In a touch panel, Y direction conductive patterns are arranged so as to be separated from wiring patterns in Y direction conductive pattern regions between electrode units of X direction conductive patterns. As a result, in this conductive sheet, it is possible to appropriately prevent the occurrence of parasitic capacitance resulting from the Y direction conductive patterns and the wiring patterns. Therefore, in a touch panel device or the like that uses such a touch panel, it is possible to effectively prevent the generation of noise that overlaps sense signals as a result of the above-mentioned parasitic capacitance, thereby making it possible to realize highly accurate touch panel sensitivity.

Conductive sheet, touch panel device, and display device

Provided is a drive circuit including: an image supply section for supplying an image to be displayed on a liquid crystal panel (); a command issuing section for issuing a command that instructs an image displayed on the liquid crystal panel () to be updated; a low-speed oscillation circuit () for supplying a low-speed clock signal (L-CLK); a high-speed oscillation circuit () for supplying a high-speed clock signal (H-CLK) higher in frequency than the low-speed clock signal (L-CLK); image outputting means for supplying, to the liquid crystal panel (), the image from the image supplying means, the image outputting means being driven by the high-speed clock signal (H-CLK); and a logic section () for controlling, in accordance with the command issued by the command issuing section, whether or not to cause the high-speed oscillation circuit () to operate, the logic section () being driven by the low-speed clock signal (L-CLK).

Drive circuit and liquid crystal display device

The liquid crystal display device () includes a liquid crystal panel () having, for each of pixels (), a digital memory element () for holding an electric potential according to image data and a liquid crystal cell () for displaying an image by receiving the electric potential from the digital memory element (); and a liquid crystal driver circuit () having an AC control section () for reversing a polarity of an AC voltage applied to the liquid crystal cell () on a given cycle and an image transmission control section () for issuing instruction on outputting of image data to the liquid crystal panel (). In a case where an image data transmission period contains a period during which a voltage in the liquid crystal cell () is reversed in response to a polarity reversal of the AC voltage applied to the liquid crystal cell (), the image transmission control section () causes image data to be outputted to the liquid crystal panel () after the polarity reversal of the voltage in the liquid crystal cell () is completed. This makes it possible to (i) prevent a decrease in reliability of liquid crystal, (ii) update, without rewriting data, an image to be displayed, and (iii) prevent a deterioration in quality of a displayed image.

Liquid crystal display device, display method, display program, and computer readable recording medium

During the first frame, a first common electric potential is used, all picture elements of an identical line have an identical write polarity, there is another line of picture elements having a write polarity different from the identical write polarity, a data signal having a first electric potential lower than the first common electric potential is supplied to a line for a negative write polarity, a picture element electrode electric potential is changed to a second electric potential greater than a second common electric potential and lower than the first common electric potential by changing a storage capacitor electric potential from Low to High after a selection period ends, a data signal having a third electric potential greater than the first common electric potential is supplied to a line for a positive write polarity, and the storage capacitor electric potential is still kept Low after the selection period ends.

Display apparatus and display apparatus driving method

Disclosed is a position detection system capable of detecting the position of a line-shaped object. From among two connected lines (EEand E'E&#x2032;) created by connecting opposed intersecting points among four interesting points (E, E, E&#x2032;, and E&#x2032;), a position detection unit () treats the one connected line (EE) with a length closer to the overall length of a rod (ST) as the position of the rod (ST) that overlaps a coordinate map region (MA).

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Sakai, Japan

Daiji Kitagawa