Casio Computer Co., Ltd.

Manabu Takei

Jun Ogura

Tomoyuki Shirasaki

Shunji Kashiyama

Tsuyoshi Ozaki

Tetsushi Yoshida

Ikuhiro Yamaguchi

Tomio Tanaka

Hiroyasu Yamada

Masaharu Shioya

Yasuhiro Daiku

Satoru Shimoda

Kazuhito Sato

Tetsuo Muto

Motohiko Yoshida

A pixel includes a light emitting element and a driving element connected to the light emitting element. After an initial voltage is applied to one end of a current path of the driving element via the signal line, the pixel driving device acquires the threshold voltage of the driving element based on a voltage value at a terminal of the signal line when the initial voltage is cut off and the relaxation time is elapsed. The voltage-current characteristics of the driving element is acquired based on the voltage value at the terminal of the signal line when the current flows into the current path of the driving element via the signal line. The current gain value of the driving element is acquired based on the threshold voltage of the driving element. The image data is corrected based on the acquired threshold voltage.

Pixel driving device, light emitting device and light emitting device driving control method

Disclosed is a display apparatus including a plurality of display pixels formed of a plurality of first electrodes provided in one surface side of a substrate, a second electrode which faces each of the first electrodes and display functional layers which are provided between each of the first electrodes and the second electrode and a resistive film having a predetermined resistivity in which one surface side is provided so as to face the other surface side of the second electrode having a predetermined space above the upper surface of a partition wall layer to define a forming region for each of the display pixels and which is disposed so as to be conductive to the other surface side of the second electrode by a pressure applied from outside, and the second electrode constructing the display pixels is double used as an electrode for detecting a position where the pressure is applied.

Display apparatus, drive control method of display apparatus and manufacturing method of display apparatus

A display device includes a display panel having a plurality of signal lines and scanning lines with a plurality of display pixels containing current control type light emitting devices; a scan driver circuit which applies a scanning signal to each of the scanning lines and sets the display pixels connected to the scanning lines in a selective state; a signal driver circuit which generates gradation current based on a display data luminosity gradation component and supplies to the display pixels set in the selective state; a precharge circuit which applies a precharge voltage to each signal line and sets a capacity component attached to each of the scanning lines in a predetermined charged state; and an operation control circuit which controls setting of the light emitting devices in a non-light emitting state when the capacity component is set in a predetermined charged state.

Display device and associated drive control method

A data acquisition circuit sets one of the potential value at one end of a signal line and the value of a current flown thereto when one end of a current path of a drive device is connected to a light emitting device with the other end thereof set to a potential value where no current flows to the light emitting device. Then the circuit causes current to flow via the current path and the signal line and acquires one of the value of the current flown to the signal line and the potential value at the one end of the signal line according to the set value. A correction operation circuit acquires a threshold voltage and a current amplification factor of the drive device based on one of the current and potential values thus acquired as well as on one of the potential and current values thus set.

Display driving apparatus, display apparatus and drive control method for display apparatus

A pixel driving device for drive control of pixels, has a image data conversion circuit for generating an original gradation signal by converting an image data, based on a preset conversion property, a signal correction circuit for outputting a corrected gradation signal by adding a correction value acquired based on an electric property parameter of a pixel to the original gradation signal, and a drive signal impressing circuit for impressing a voltage signal corresponding to the corrected gradation signal on one end of a signal line. The original gradation signal has a value that corresponds to a gradation value of the image data and the maximum value of the original gradation signal is set to a value equal to or smaller than a value acquired by subtracting a value corresponding to the correction value from a maximum value in an input range of the drive signal impressing circuit.

Pixel driving device and a light emitting device

A light emitting device has a plurality of pixels, each of which includes a drive transistor, a light emitting element and signal lines, a property parameter acquisition circuit which acquires property parameter, a signal correction circuit that generates a corrected gradation signal by correcting the image data based on the property parameter, and a drive signal impressing circuit that impresses a drive signal, generated based on the corrected gradation signal, on the pixel to drive it. The property parameter is constituted of a threshold voltage, a current amplification factor and its irregularity of the drive transistor, and is acquired based on measured voltages of the signal lines after each of a plurality of predetermined settling times elapses from the time when the light emitting device cuts off a voltage subsequent to impressing the voltage on each pixel for a predetermined length of time.

Light emitting device and a drive control method for driving a light emitting device

A pixel driving device in which, after a reference voltage exceeds a threshold voltage of a drive transistor is impressed through the signal lines on each pixel equipping a light emitting element and the drive transistor, set the signal lines in a state of high impedance, and acquires a voltage value of one end of the signal lines subsequent to a predetermined settling time elapsing, and acquires the threshold voltage of the drive transistor for each pixel and the current amplification factor of the pixel drive circuit as a first property parameter based on acquired voltage values at the time a plurality of first settling times longer than a predetermined value and acquires an irregularity parameter indicating the irregularity in the current amplification factor based on the value of the first property parameter and the measured voltage value acquired at the time shorter than the predetermined value.

Pixel driving device, light emitting device, and property parameter acquisition method in a pixel driving device

A pixel driving device has a voltage impressing circuit that outputs a reference voltage that exceeds a threshold voltage of a drive transistor, a voltage measurement circuit, and a property parameter acquisition circuit that acquires a property parameter related to an electronic property of a pixel. The pixel driving device impresses the reference voltage on the pixel that has a light emitting element and the drive transistor. The voltage measurement circuit acquires voltage of a signal line, as measured voltages, after each of a plurality of the settling times elapsing from the time when the reference voltage is cut. The property parameter acquisition circuit acquires, as property parameters, the threshold voltage and a current amplification factor of drive transistor based on values of a plurality of measured voltages acquired by the voltage measurement circuit.

A display element drive circuit includes a first circuit which holds as a voltage component electric charges based on a gradation signal corresponding to display data, a second circuit which supplies the gradation signal to the electric charge holding circuit at a timing of application of a selection signal, current control type display elements, and a third circuit which generates a driving current based on the voltage component held in the first circuit and supplies the generated driving current to the display element. One of the second and third circuits includes at least one field effect transistor. The field effect transistor includes gate, source and drain electrodes, and a source-side parasitic capacitance formed between the gate and source electrodes and a drain-side parasitic capacitance formed between the gate and drain electrodes of the field effect transistor have different capacitance values.

Display element drive circuit and display apparatus

A display device which displays image information based on display data comprising a display panel having a plurality of signal lines and scanning lines with a plurality of display pixels containing current control type light emitting devices; a scan driver circuit applies a scanning signal to each of the scanning lines and sets the display pixels connected to the scanning lines in a selective state; a signal driver circuit generates gradation current based on the display data luminosity gradation component and supplies to the display pixels set in the selective state; a precharge circuit applies a precharge voltage to each signal line and sets a capacity component attached to each of the scanning lines in a predetermined charged state; and an operation control circuit controls setting of the light emitting devices in a non-light emitting state when the capacity component is set in a predetermined charged state.

A display device includes a display panel having rows of scanning lines and columns of data lines; and a matrix of display pixels near intersections of the scanning lines and the data line. A scanning driver circuit which selects display pixels of rows connected to some of the scanning lines, and a signal driver generates display data for each display pixel. The display panel has scanning line groups which constitute sets of scanning lines through which simultaneous selection is performed by the scanning driver circuit; a plurality of scanning signal lines connected to each of the scanning line groups; and a plurality of data line groups which constitute sets of the data lines corresponding to a line count of the display pixels of the rows connected to each of the scanning line groups within the data lines.

Drive device and a display device

A thin film transistor panel including: a transparent substrate; scanning lines made of a light blocking electroconductive material to be formed on the transparent substrate; data lines formed on the transparent substrate to be perpendicular to the scanning lines and made of a light blocking electroconductive material; thin film transistors, each provided with a transparent gate electrode connected to one of the scanning lines, a transparent drain electrode connected to one of the data lines, a transparent source electrode and a transparent semiconductor thin film; and transparent pixel electrodes connected to the thin film transistors, wherein each of the pixel electrodes is formed to cover at least a part of the gate electrode of each of the thin film transistors.

Thin film transistor panel

A display panel () includes a plurality of optical elements (OEL) each having a pair of electrodes and performing an optical operation according to current passing between the pair of electrodes, a current line (DL), a switch circuit (Tr) that passes a write current (Ia) with a predetermined current value through the current line (DL) during a selection time (Tse) and stops passing current during a non-selection time (Tnse), and a current storage circuit (Tr, Tr, Cs, Cp) that stores current data according to the current value of the write current (Ia) passing through the current line (DL) during the selection time (Tse) and that supplies a drive current (Ib) having a current value, which is obtained by subtracting a predetermined offset current (Ioff) from the current value of the stored write current (Ia), to the optical elements (OEL) during the non-selection time (Tnse).

Display device and its driving method

A pixel circuit flows a current having a current value corresponding to a test voltage without intervening any display element.

Pixel circuit board, pixel circuit board test method, pixel circuit, pixel circuit test method, and test apparatus

A luminescent panel includes a transparent substrate, a first transparent electrode provided on the transparent substrate, a luminescent layer provided on the first transparent electrode, and a second transparent electrode provided on the luminescent layer. A reflecting film provided on the second electrode, reflects light emitted from the luminescent layer through the second transparent electrode and causes the reflected light to outwardly emit from the transparent substrate.

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Sagamihara, Japan

Manabu Takei