Sanyo Electric Co., Ltd.

Tpo Displays Corporation

Chimei Innolux Corporation

Ipo Displays Corp

Keiichi Sano

Yasuo Segawa

Wei-Cheng Lin

Kazuto Noritake

Tsutomu Yamada

Fu-Yuan Hsueh

Norio Tabuchi

Cheng-Ho Yu

Michiru Senda

Ryoichi Yokoyama

Hiroshi Matsuda

Kai-Chieh Yang

Shoichiro Matsumoto

Ya-Hsiang Tai

Naoaki Komiya

Masayuki Koga

Ting-Yu Chang

Koji Marumo

Kuni Yamamura

Kenya Uesugi

Norio Nakatani

Fang-Hsing Wang

A sample/hold circuit is appropriate for a pixel unit including a liquid crystal capacitor and includes a sampling transistor, a sampling capacitor, a first switching transistor, and a second switching transistor. The sampling transistor is coupled to the liquid crystal capacitor for sampling a voltage stored in the liquid crystal capacitor. The sampling capacitor stores the sampling result. The first switching transistor includes a gate and a source respectively coupled to two terminals of the sampling capacitor. The second switching transistor includes a gate and a drain respectively coupled to the terminals of the sampling capacitor.

Sample/hold circuit, electronic system, and control method utilizing the same

A source-follower-type analogue buffer with an active load, a new compensating operation and a display with the source-follower-type analogue buffers are developed to reduce an error voltage which is the difference between an input voltage and an output voltage of the analogue buffer. The source-follower type analogue buffer can also minimize the variation from both the charging time and the device characteristics and maximize the range of the input voltage.

Source-follower type analogue buffer, compensating operation method thereof, and display therewith

A display capable of reducing the increase in the current consumption is disclosed. The display comprises a shift register circuit having a plurality of first circuit portions connected thereto. Each of the first circuit portions includes a first conductive type first transistor connected to a first voltage supply source, a first conductive type second transistor connected to a second voltage supply source, a first conductive type third transistor connected between the gate of the first transistor and the second potential, a first conductive type fourth transistor connected to the gate of the first transistor and turned on in response to a first signal, and a first conductive type fifth transistor connected between the fourth transistor and the first potential and turned off in response to a second signal when the first signal is for turning on the fourth transistor.

Display device having a shift register capable of reducing the increase in the current consumption

A reading circuit including a detection module, a first transistor, and a compensation module is disclosed. The detection module detects a light. The first transistor transforms the detection result for generating a current signal. The compensation module compensates a threshold voltage of the first transistor.

Reading circuit, display panel and electronic system utilizing the same

A video signal line receives a voltage video signal. The supplied voltage video signal is provided to a voltage-current conversion circuit in a corresponding column. The voltage-current conversion circuit converts the voltage video signal into a current signal, and supplies the current signal to a corresponding pixel circuit. Each voltage-current conversion circuit includes an output transistor for supplying current in accordance with the voltage video signal, and a compensation circuit for compensating for variations in threshold of the output transistor.

Display device using current driving pixels

A digital to analog converter is provided comprising a charge sharing circuit, a discharging circuit and a voltage boosting circuit. The charge sharing circuit sequentially receives first to (N&#x2212;1)th bits of serial digital signals. The charge sharing circuit shares and stores charges between a first capacitor and a second capacitor according to a charging voltage, a ground voltage, a first clock signal and serial data signals. The discharging circuit discharges the charge sharing circuit according to a reset signal. After the voltage boosting circuit receive the (N&#x2212;1)th digital signal, the charge boosting circuit whether to boost a first terminal and a second terminal of the second capacitor or not based on an Nth digital signal. After the voltage boosting circuit receives the Nth serial digital signal, the charge sharing circuit outputs an analog signal from the second terminal of the second capacitor.

System for displaying image and digital-to-analog converting method

A display capable of suppressing the increase in current consumption is disclosed. The display comprises a first transistor connected to a first potential, a second transistor connected to a second potential, a third transistor for turning off the first transistor when the second transistor is in on state, a fourth transistor connected to the first potential, a fifth transistor connected to the second potential, and a sixth transistor operated to turn off when the third transistor is in on state and also operated to turn off the fourth transistor when the fifth transistor is in on state.

Shift register for driving display

Each pixel in a display device includes an emissive element, a driver transistor, a control transistor, and a control capacitor. The driver transistor is provided between the emissive element and a power supply and controls supply of power from the power supply to the emissive element. The control transistor is connected between a constant voltage power supply and a gate of the driver transistor, receives a digital data signal on a gate, and controls whether or not to fix a gate voltage of the driver transistor. The control capacitor is connected between a control line and the gate of the driver transistor. The gate voltage of the driver transistor is shifted to a voltage corresponding to a control pulse signal when the control transistor is off and is non-fixed during a light emission period defined by the control pulse signal applied to the control line.

Light emitting device and display device

A signal sampled by a sampling transistor is amplified with low power consumption. A display voltage signal Vsig sampled by the sampling transistor is amplified by an amplifier circuit of this invention. A thin film transistor Twhich functions as a MOS capacitance is connected to a signal line DL to which the display voltage signal Vsig is outputted. A voltage boosting pulse VPis applied to a gate of the thin film transistor T. And the thin film transistor Tis switched from ON to OFF during change in the rising pulse. The amplifier circuit amplifies the signal through the use of difference between the gate capacitance of the thin film transistor Tin ON state and the gate capacitance of the thin film transistor Tin OFF state.

Amplifier circuit

When a switching TFT is switched on, a data voltage on a data line is stored in a storage capacitor as a gate voltage of a driver TFT. In this state, a voltage on a pulse drive line is caused to fall. AMOS type capacity element having a second electrode connected to a reference voltage is connected to a gate of the driver TFT. The MOS type capacity element is in an ON state before a fall of the pulse drive line and becomes an OFF state during the fall, and a capacitance changes at the switching of ON state to the OFF state. Therefore, the slope of fall of the gate voltage changes, and the gate voltage after the fall on the pulse drive line can be corrected corresponding to the variation in the threshold values among driver TFTs.

Pixel circuit and display device

Systems for displaying images. The system comprises a digital-to-analog converter, in which a first conversion stage selects first and second voltages of a plurality of reference voltages according to m most significant bits of a k bit input signal; and a second conversion stage converting n least significant bits of the k bit input signal to a voltage between the first and second voltages. In the second conversion stage, according to first and second bits of the least significant bits, a first switching capacitor unit charges a first capacitor during a first period and then the second switching capacitor unit performs a first charge sharing between the first capacitor and a second capacitor, and the first switching capacitor unit charges the first capacitor again and then the second switching capacitor unit performs a second charge sharing between the first capacitor and the second capacitor.

System for displaying images

A display device in which variations of characteristics of a TFT are eliminated and the aperture ratio is improved is provided. A display device has a thin film transistor on an insulating substrate. The thin film transistor includes first gate electrodes, a gate insulating film, a semiconductor filmwhich is formed on the first gate electrode, and a interlayer insulating film. The thin film transistor further includes second gate electrodeswhich are on the interlayer insulating filmand at least above channels, and which are connected to the first gate electrodes. A reflective display electrodeconnected to the source of the thin film transistor is elongated to extend above the thin film transistor.

Display device

A semiconductor device for individually controlling an element to be driven, such as an electroluminescence element, includes a switching TFT which operates when a selection signal is applied to its gate and which also captures a data signal, and an element-driving TFT in which its drain is connected with a drive power source, its source is connected with the element to be driven, gate receives a data signal supplied from the switching TFT, for controlling electric power supplied from the drive power source to the element to be driven. The semiconductor device further includes a storage capacitor having a first electrode connected with the switching TFT and with the gate of the element-driving TFT and a second electrode connected between the source of the element-driving TFT and the element to be driven, for holding the gate-source voltage of the element-driving TFT in accordance with the data signal, and a switching element for controlling the potential of the second electrode of the storage capacitor. With such a configuration, all the above-described switches can be formed by TFTs of the same conductivity type and reliable supply of electric power to the element to be driven can be assured.

Semiconductor device and display apparatus

A pair of storage capacitor electrodes are extended along a data line to provide storage capacitance along the data line. One of the storage capacitor electrodes is a metal electrode which partially overlaps the data line. Light can thereby be shielded in a region between the data line and a pixel electrode while forming a storage capacitor. The other storage capacitor electrode is positioned so as to avoid overlapping the data line, thereby suppressing coupling between the data line and the other storage capacitor electrode.

Active matrix type display device

A display device in which variations of characteristics of a TFT are eliminated and the aperture ratio is improved is provided. A display device has a thin film transistor on an insulating substrate . The thin film transistor includes first gate electrodes , a gate insulating film , a semiconductor film which is formed on the first gate electrode , and a interlayer insulating film . The thin film transistor further includes second gate electrodes which are on the interlayer insulating film and at least above channels , and which are connected to the first gate electrodes . A reflective display electrode connected to the source of the thin film transistor is elongated to extend above the thin film transistor.

Growing community of inventors

Taipei, Taiwan

Keiichi Sano