Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Tomoya Ishikawa

Hiroshi Kojima

Hideki Tanaka

Fumio Mihara

Masaaki Nishihara

Kenji Kamada

Yoshiyuki Otani

Tooru Suyama

Hirofumi Nakagawa

A display apparatus driving circuit capable of reducing the amount of heat generated at a driving unit while suppressing degradation in image quality is provided. A display apparatus driving circuit according to the present invention includes: a source driver for driving a display unit; a heat detecting circuit for detecting amount of heat generated at the source driver, and outputting a heat detection signal when the detected amount of generated heat is equal to or larger than a predetermined reference value; and a heat reduction circuit for changing, when the heat detection signal is received, a driving method of the display unit to reduce the amount of heat generated at said source driver.

Method and apparatus for reducing heat generated at source driver of display apparatus

To a level shift basic circuit having a CMOS configuration and composed of four transistors Mthrough M, a control circuit for preventing feed-through current through the transistors is added. Transitions of complementary data inputs Vinand Vinare made in a period in which n-MOS transistors Mand Mfor control are turned OFF by changing a control input VSto an L level (switch-off period). In this switch-off period, each source of the n-MOS transistors Mand Mis disconnected from VSS. In addition, in the switch-off period, a control input VSis changed to an L level, thereby turning ON p-MOS transistors Mand Mfor control. In a period in which the control p-MOS transistors Mand Mare ON, data outputs Voutand Voutare both precharged to VDD (precharge period).

Level shift circuit

Growing community of inventors

Osaka, Japan

Tomoya Ishikawa