Industrial Technology Research Institute

Other

Shang-Li Chen

Jun-Ren Shih

Jan-Ruei Lin

Bowen Wang

Bo-Wen Wang

Chien-Ru Chen

Ming-Daw Chen

Chien-Yu Yi

Chain-Ru Chen

Chun-Fu Chung

A single-type thin-film transistor (TFT) is used for making a thin-film transistor liquid crystal display (TFT-LCD). The scan driving circuit of the liquid crystal display is made of P-type thin-film transistors or N-type thin-film transistors so as to decrease the steps required by the manufacture process and reduce the cost and the probability of error occurring.

Scan driving circuit with single-type transistors

A Pixel Circuit For Liquid Crystal Display Using Static Memory is disclosed, wherein a digital circuit is installed at a pixel of the liquid crystal display (LCD) for processing static image. The digital circuit works with an analog circuit for processing dynamic image. Several multiplexers and static memory are provided to enhance the digital and analog signal processing, for lowering the power consumption so as to accomplish power saving function of a Pixel Circuit For Liquid Crystal Display Using Static Memory.

Pixel circuit for liquid crystal display using static memory

A pixel circuit for liquid crystal display is disclosed, wherein a digital circuit is installed at a pixel of the liquid crystal display (LCD) for processing static image. The digital circuit works with an analogue circuit for processing dynamic image. Several multiplexers are provided to enhance the digital and analogue signal processing, for lowering the power consumption so as to accomplish power saving function of a pixel circuit for liquid crystal display.

Pixel circuit for liquid crystal display

A pixel circuit for active matrix OLED and driving method is proposed in this invention, which includes five transistors and one capacitance, it's mainly use a first-transistor connected to a control line to let a second transistor connected to the former scan line off when writing a low voltage in, so to avoid large current generation and IR-drop, finally the illumination will be more uniform than prior art.

Pixel circuit for active matrix OLED and driving method

The main differences between the present invention the conventional pixel circuit for active matrix of current driving device is the usage of the auxiliary transistor(s). In the invention, at least one auxiliary transistor is used to separate both the transistor, which is directly electrically coupled to the current driving device, and the plate, which is not directly electrically coupled with a constant voltage source, of the capacitor from the other transistors of the pixel circuit. Hence, all circuit and voltage, which are induced by the switching process of these transistors, are blocked or compensate by the auxiliary transistor(s), and the stored voltage of the capacitor would be unaffected.

Pixel circuit for active matrix of current driving device

A circuit for driving active matrix LED pixels, having a capacitor, a light emitting diode, and a first and second transistor. The capacitor is connected between a gate and source of the first transistor, and the second transistor has a source connected to a drain of the first transistor and a gate connected to receive a first voltage by which the first and second transistor operates in a saturation region, and a current switch controlled by a scan signal, wherein a first current corresponding to a data signal flows through the first and second transistor to generate a second voltage stored on the capacitor when the current switch is closed, and a second current through the first and second transistor is generated by the second voltage stored on the capacitor to turn on the light emitting diode when the current switch is opened.

Active matrix led pixel driving circuit

A shift-register unit. The first transistor includes a first source/drain coupled to a first terminal, a second source/drain, and a first gate coupled to a reset signal to stop the shift-register unit outputting a pulse signal. The second transistor includes a third source/drain coupled to the second source/drain, a fourth source/drain coupled to a second terminal, and a second gate coupled to a setting signal to initial the shift-register unit. The third transistor includes a fifth source/drain coupled to an output terminal, a third gate coupled to the second source/drain and a sixth source/drain coupled to a clock signal to start outputting the pulse signal. The fourth transistor includes a seventh source/drain coupled to the first terminal, an eighth source/drain coupled to the output terminal and a fourth gate coupled to a refresh signal to set a voltage level of the shift-register unit in a standby mode.

Shift-register circuit and shift-register unit

A pixel structure for an active matrix OLED. A first switching transistor has a control terminal coupled to a first scan line, and a first terminal coupled to a data line. A first P-type transistor has a drain and a gate coupled to each other, and a source coupled to a voltage source. The drain is also coupled to a second terminal of the first switching transistor. A second P-type transistor has a source coupled to the voltage source, and a second switching transistor has two terminals coupled between gates of the first and second P-type transistors, and a control terminal coupled to a second scan line. A storage capacitor is coupled between the voltage source and the gate of the second P-type transistor. An OLED has an anode coupled to the drain of the second P-type transistor and a cathode coupled to ground.

Pixel structure for an active matrix OLED

The present invention is related to a unit gain buffer of the driver circuit to drive the data line in the filed of LCD data driver, further to be preferably applied to the new TFT-LCD processing of low temperature poly-silicon. This invention is using the plurality of PMOS transistor connection to result in the almost same value between the Vout and Vin. There is no using of the feedback connection in this invention, so the using of the compensation capacitor can be avoided, furthermore the data driver layout area of the LCD driver can be reduced. This invention can improve the defect of the larger layout area result from the prior art.

Unit gain buffer

A power-saving data driver for stepwisely applying alternating driving voltages with a predetermined number of steps to a plurality of data lines in a liquid crystal display is disclosed. The data driver is comprised of a clocking means, a plurality of reference voltages, and a plurality of analog voltage driver. The clocking means is used for providing clock signals for stepwisely charging and discharging. The plurality of reference voltages work as steps of said stepwisely charging and discharging. The reference voltages are distributed between the system voltage and the ground. Each of the analog voltage driver corresponds to one of the data lines. A given pixel is stepwisely driven from a driving voltage of the last pixel as a beginning voltage to a driving voltage of the given pixel as a target voltage. The reference voltages between the beginning voltage and the target voltage are turned-on in order according to the clock signals generated by the clocking means.

Low-power LCD data driver for stepwisely charging

Disclosed is a source follower with Vgs compensation, such that the output voltage precisely follows the input voltage by various arrangements of MOSFET's, switches, and capacitors. In addition, such a source follower that the output voltage precisely follows the input voltage can be implemented without adding too many components. The source follower disclosed in the present invention can be used in the driver circuit for a liquid crystal display (LCD).

Source follower with Vgs compensation

A scan driver of LCD with fault detection and correction circuit is disclosed herein. The scan driver fabricated on a glass substrate locates at both ends of the scan buses can simultaneously drive the scan buses from both ends. The fault detection and correction circuit of the scan driver is used to determine whether transmitting signal from a DFF at present stage into a DFF at next stage, or transmitting signal from the other DFF at present stage through a scan bus into the other DFF. The fault detection and correction circuit includes the first detecting device, the second detecting device, the control signal generating device, and the transmission control device. The first and the second detecting device generate a first logic level and a second logic level responding to a stuck-at-zero fault and a stuck-at-one fault respectively. The control signal generating device generates a first control signal when all input terminals exhibiting a second logic level, and generates a second control signal when one of input terminals exhibiting the first logic level. The transmission control device can transmit signal from one DFF to the other and to the scan bus responding to the first control signal, also can isolate them and the scan bus responding to the second control signal.

Growing community of inventors

Hsinchu, Taiwan

Shang-Li Chen