Renesas Technology Corp.

Renesas Electronics Corporation

Hitachi Device Engineering Co., Ltd.

Takatoshi Uchida

Naoki Miyamoto

Yoshikazu Yokota

Toshio Mizuno

Kazuo Ookado

Takayuki Nakaji

Kazuya Endo

Kei Tanabe

Goro Sakamaki

Yasuhito Kurokawa

In a system including a color liquid crystal panel, a liquid crystal display drive control device for driving the panel, and a microprocessor, the display drive control device of the invention lightens the burden imposed on a microprocessor as well as reduces the power consumption of the system. In the liquid crystal display drive control device that incorporates a memory for storing image data displayed on a color liquid crystal panel, reads out the image data sequentially from the memory, generates image signals of the three primary colors for each pixels of the color liquid crystal panel, and outputs the image signals from external output terminals, the display drive control device includes a transparency arithmetic circuit that applies a calculation processing to two image data read out from the built-in memory and generates data for a transparent display, supplies display data generated by the transparency arithmetic circuit to a driver, and makes the driver generate and output drive signals to the liquid crystal panel.

Display drive control device and electric device including display device

There is to be provided a liquid crystal drive controller with a built-in power supply circuit wherein latch-up is made difficult to arise even if one amplitude level of the segment line drive voltage is set to the ground potential and the levels of other liquid crystal drive voltages are determined accordingly. A semiconductor integrated circuit with a built-in power supply circuit, wherein a negative voltage generated in a power supply circuit is applied to a substrate or a well region as a bias voltage, is provided with a switch for temporarily applying the ground potential to the substrate or well region to be biased with the negative voltage at the time of starting up the power supply circuit.

Semiconductor integrated circuit with voltage generation circuit, liquid crystal display controller and mobile electric equipment

In a system including a color liquid crystal panel, a drive control device for driving the panel, and a microprocessor, the drive control device reduces the burden on the microprocessor as well as power consumption. In a liquid crystal display drive control device that incorporates a memory for storing image data displayed on a color liquid crystal panel, reads out the image data sequentially from the memory, generates image signals of the three primary colors for each pixel of the panel, and outputs the image signals from external output terminals, the drive control device includes a transparency arithmetic circuit that applies calculation processing to two image data read out from built-in memory and generates data for a transparent display, supplies display data generated by the transparency arithmetic circuit to a driver, and makes the driver generate and output drive signals to the liquid crystal panel.

Growing community of inventors

Kokubunji, Japan

Takatoshi Uchida