Sharp Kabushiki Kaisha Corporation

Shimano Inc.

Tomohiko Nishimura

Tsutomu Muraoka

Kohji Saitoh

Masami Ozaki

Masaki Uehata

Akihisa Iwamoto

Jun Nakata

Jin Miyazawa

Takeshi Yamaguchi

Saburoh Miyamoto

Hiroshi Hamada

Toshihisa Nakano

Shigeki Iguchi

Katsumi Hirano

Kazuyoshi Nomiya

Kunio Hiromoto

The invention provides a gate-in-panel display device capable of preventing deterioration of thin-film transistors during pause drive, as well as a method for driving the same. At the end of a drive period, an active clear signal is provided to thin-film transistors in unit circuits, each thin-film transistor being connected to either a first or second node at a gate terminal, thereby bringing the thin-film transistors into ON state. As a result, the voltages of the first and second nodes are set to a reference voltage. Thus, even if a pause period lasts for a long period of time, the gate terminals of the thin-film transistors are not subjected to sustained voltage application, leading to no threshold voltage shifts.

Display device and method for driving same

A gate driver () which is provided by an IGZO-GDM and a level shifter circuit () are connected to each other via a first through a fifth wires (OLthrough OL). Each wire (OL) is connected to a discharge unit (). If an electric power supply to a first through a fifth output circuits (OCthrough OC) in the level shifter circuit () becomes lower than a lower operation limit value during a power-off sequence which is supposed to remove a residual charge from inside a panel, outputs from the first through the fifth output circuits (OCthrough OC) assume a high-impedance state, whereupon a potential on each wire (OL) is drawn by a discharge unit () into a ground potential. Therefore, residual charge inside the panel is removed quickly and stably when power supply is shut off.

Display device and method of driving the same

In a display device that can use a low frequency drive method, in the case of low frequency drive, in a data correction unit () of a display control circuit (), a pixel grayscale value is set such that the differential value between the potential difference between the pixel electrode and the common electrode when a voltage of positive polarity is applied and the potential difference between the pixel electrode and the common electrode when a voltage of negative polarity is applied becomes larger than during normal drive. With this, a correction amount (shift amount) is made larger during low frequency drive than during normal drive, whereby flickers and ghosting during low frequency drive are prevented.

Display device that compensates for changes in driving frequency and drive method thereof

A liquid crystal display device includes: a data signal line; a scan signal line; a pixel electrode; a transistor connected to (i) the data signal line, (ii) the scan signal line, and (iii) the pixel electrode; and a common electrode, the liquid crystal display device being configured to turn on the transistor during a power-off sequence by causing a change in an electric potential of the scan signal line, the electric potential of the scan signal line reaching a first electric potential at a first timing after the change is initiated, and the common electrode being in an electrically floating state at a second timing which comes after the first timing. This, in a case where the transistor is turned on in preparation for an operation to turn off a power source of the liquid crystal display device, makes it unlikely for a DC voltage to be applied across a pixel even if potential variation (kickback) occurs at the pixel electrode in reaction to a change in status of the transistor from an on state to an off state.

Liquid crystal display device and liquid crystal display device driving method

Provided is a display device with a touch sensor that can avoid the influence of noise originating from the polarity inversion of a common voltage of the display device without using special circuitry. The display device with a touch sensor includes a sensor output readout circuit () that is sequentially connected to multiple sensor electrodes in a touch sensor unit () and outputs signal voltages that correspond to the electrical characteristics of the electrodes, a sensor control circuit () that supplies a control signal to the sensor output readout circuit (), and a coordinate computation circuit () that detects a contact position based on the signal voltages. The sensor control circuit () causes a scan operation, in which the sensor output readout circuit () is sequentially connected to all of the sensor electrodes of the touch sensor unit () and outputs the signal voltages, to start after the common voltage has switched from a first polarity to a second polarity, and to end before the common voltage returns to the first polarity.

Display device with touch sensor

In order to provide a touch sensor-equipped display device that is not susceptible to the effect of noise caused by a polarity reversal in a common voltage of a display device without using special circuitry, the disclosed touch sensor-equipped display device is provided with: a sensor output read circuitthat is sequentially connected to a plurality of sensor electrodes of a touch sensor partand that outputs a signal voltage according to the electrical properties of each electrode; a sensor control circuitthat supplies a control signal to the sensor output read circuit; and a coordinate calculation circuitthat detects a contact position on the basis of the signal voltage. The coordinate calculation circuitis provided with: an averaging circuitthat calculates the average values of signal voltage values obtained during a scan that was started in synchronization with a horizontal synchronization signal when the common voltage is reversed from positive polarity to negative polarity, and the signal voltage values obtained during a scan that was started in synchronization with a horizontal synchronization signal when the common voltage is reversed from negative polarity to positive polarity; and a contact position detection circuitthat detects the contact position on the basis of the average values.

Touch sensor-equipped display device

Provided is a touch sensor-equipped display device that is not susceptible to the effect of noise caused by the reversal of polarity of the common voltage of the display device, without using special circuits. The touch sensor-equipped display device includes: a touch sensor unithaving a plurality of sensor electrodes; a sensor output read circuitthat is sequentially connected to the respective sensor electrodes and that outputs a signal voltage corresponding to the electrical characteristics of the sensor electrode connected thereto; a sensor control circuitthat supplies a control signal to the sensor output read circuit; and a coordinate calculation circuitthat detects a contact position on the basis of the signal voltage. The coordinate calculation circuitincludes: an averaging circuitthat calculates an average value for the signal voltage values outputted from the sensor output read circuitover two cycles of the vertical synchronizing signal; and a contact position detection circuitthat detects the contact position on the basis of the average value.

A touch-sensored display deviceaccording to the present invention includes: a counter substratedisposed on a viewer side of an active matrix substratevia a display medium layer, the counter substratehaving a counter electrodewhich opposes pixel electrodes; a display panel driving circuitfor supplying to the counter electrodea common voltage which undergoes periodic inversion in polarity; a transparent conductive filmfor position detection placed so as to oppose the counter electrodevia the counter substrate; a strobe signal generation circuitfor generating a strobe signal which is in synchronization with a polarity inversion period of the common voltage, and a noise-cut current signal generation circuitfor generating a noise-cut current signal which is obtained by eliminating based on the strobe signal a predetermined portion from a current flowing from a terminal connected to the transparent conductive filmfor position detection.

Display device with touch sensor, and drive method for the device

A coordinate position detection device includes: charging circuits having both the capability of charging a coupling capacitance in a capacitive-coupling touch panel with a position-detection resistive film whose potential periodically varies between a positive potential and a negative potential and the capability of restoring the charged coupling capacitance to its state prior to charging; current-to-voltage conversion circuits converting into a voltage the total amount of charging currents of the coupling capacitance after the charging circuits supply the charging current to the coupling capacitance a plurality of times; and a computation device detecting the coordinate position of a touched area based on the outputs of the current-to-voltage conversion circuits.

Coordinate position detection device for touch panel

A bicycle pedal assembly has a cleat releasably coupled to a pedal by a cleat engagement mechanism formed on an upper surface of its pedal body. The pedal body has a front end configured and arranged to include a sole guide portion that assists the rider in rotating the pedal body about its pedal shaft. In one embodiment, the sole guide portion is formed by a first concaved sole receiving recess located in a tip surface of the pedal body and a second concaved sole receiving recess located on the upper surface of the pedal body adjacent to the tip surface. Alternatively, the concaved sole receiving recesses can be replaced with either a pair of laterally spaced projections located on at the front end of the pedal body, or a V-shaped tip surface.

Growing community of inventors

Osaka, Japan

Tomohiko Nishimura