Synaptics Japan Gk

Synaptics Corporation

Synpatics Display Devices Gk

Yoshinori Ura

Kiichi Makuta

Keita Tsubakino

Toshikazu Arai

Jun Uchida

Yutaka Saeki

Taisuke Koshino

A display driver comprises: a first grayscale line; output circuitry configured to receive a first grayscale voltage from the first grayscale line and perform digital-analog conversion on a pixel data to output a source output voltage corresponding to the pixel data, the digital-analog conversion being based on the first grayscale voltage; and first gamma assist circuitry comprising a first holding node to hold the first grayscale voltage received from the first grayscale line and configured to drive the first grayscale line based on a first voltage between the first holding node and the first grayscale line.

Method and system for stabilizing a source output voltage for a display panel

A display drive circuit includes: source amplifiers capable of driving source lines of a display panel connected thereto; preamplifiers capable of outputting first gradation voltages; source circuits each including a division of the source amplifiers, provided that the source amplifiers are divided equally; and resistance arrays. Each source circuit is provided with one of the resistance arrays. Each resistance array divides input first gradation voltages to generate second gradation voltages and provides them to the corresponding source circuit. The worsening of the capability of converging of gradation lines for supplying second gradation voltages to the source circuits can be suppressed without providing gradation-voltage-generation circuits even with a display driver IC having an increased long side length, or more than one display driver IC provided.

Display drive circuit and display device

A gradation voltage corresponding to a display data is input to a signal electrode driving circuit. The signal electrode driving circuit includes a voltage output circuit which outputs a drive voltage corresponding to the input gradation voltage, and a slew rate assist circuit which accelerates a transition of an output voltage of the voltage output circuit. The slew rate assist circuit accelerates the transition of the output voltage after a predetermined time from a start of transition of the gradation voltage.

Display driver

Detection circuits cause a power supply circuit to start an initialization sequence by detecting abnormal behavior where an external power supply voltage is cut off, the power supply circuit generating a first internal power supply voltage from a first external power supply voltage and generating a second internal power supply voltage from a second external power supply voltage higher than the first external power supply voltage in terms of an absolute value, and an auxiliary amplifier that makes up for a drop in the first internal power supply voltage, using the second external power supply voltage as an operation power supply after detecting the abnormal behavior of the first external power supply voltage. A sample and hold circuit of a reference voltage of the auxiliary amplifier is configured in a hold state after detecting the abnormal behavior of the first external power supply voltage.

Growing community of inventors

Tokyo, Japan

Yoshinori Ura