Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Osamu Sarai

Tetsuo Asada

Yoshito Date

Kazuyoshi Nishi

Junji Takiguchi

Fuminori Tanemura

Takashi Koizumi

Yoshio Imamura

Hirofumi Nakagawa

Miki Fujino

Jun Suzuki

Keiji Tanaka

Tetsurou Ohmori

In an output mode, an output switch (SW) is turned on and supply switches (SW, SW) are turned off, and output current is supplied to an intermediate node (nc) from driving transistors (T, T). In a transition mode, the output switch (SW) is turned off and the supply switches (SW, SW) are turned on, and supply of the output current from the driving transistors (T, T) is shut off. Meanwhile, capacitance elements (C, C) receive voltage from reference nodes (Vcc, Vss). Also input voltage (Vin) is supplied to the intermediate node (nc).

Display driver circuit

If a display is subjected to n line dot inversion drive control, the polarity pattern of sub-pixels is shifted line by line in a cycle of n frames. Furthermore, in every n horizontal scanning periods in which the polarities of output terminals of a source driver are switched, at least two of the output terminals are short-circuited to carry out electrical charge recovery. By using these methods, it is possible to achieve a reduction in power consumption while improving image quality.

Display and method for driving the same

A level shift circuit having a latch function includes a precharging PMOS transistor MPwhich is turned on in a precharge period to interrupt a through current of an input stage, an NMOS transistor MNwhich inputs data and performs discharging in a data input period, and a transistor MPfor holding data after level shifting. Thus, each of the transistors can have a minimum configuration. Since the level shift circuit has a latch function, it is possible to omit a circuit for latching input data, thereby reducing a circuit area.

Level shift circuit

A signal line driving circuit includes an output section out(where N is a natural number) for supplying an image-forming signal for red, green or blue to a sub-pixel of a display section, a voltage supply line Sconnected to the output section out, and a shorting line for electrically shorting output sections of the same color with each other during a predetermined period. By shorting output sections of the same color with each other, the charge stored in a panel-side load can be effectively redistributed to another panel-side load, thereby realizing a power conserving effect.

Display device driving circuit and display device

A differential amplifier achieving a high throughput rate with reduced power consumption includes a differential circuit, output circuit, a constant current source transistor, a drive transistor, and a switching circuit. A difference voltage relative to a difference between voltages applied to non-inverting and inverting inputs of the differential circuit is applied to the switching circuit. The switching circuit supplies a drive signal to the drive transistor to enable the drive transistor when the difference voltage is below a predetermined threshold voltage, and to disable the drive transistor when the difference voltage is above the predetermined threshold voltage.

Differential amplifier circuit with a high through put rate and reduced

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Osaka, Japan

Osamu Sarai