Tpo Hong Kong Holding Limited

Masakatsu Yamashita

Masaru Yasui

Shuji Hagino

A driving circuit and display device reducing waste of a bias current of an amplifier and conserving power. The driving circuit includes a driving signal supply mechanism, an amplifier mechanism and a control mechanism. The supply mechanism supplies a driving signal having a target voltage represented during periodic update. The amplifier mechanism has an amplifier part, a current-adjustable constant current source and a switch part. The driving signal is input to the amplifier part, which generates an output to a capacitance load according to the driving signal. The current source supplies and regulates a passing rate of the bias current to the amplifier part. The switch part performs ON/OFF control to the current output to the current source. The control mechanism detects a difference between the previous and present values of the target voltage to change a current value of the current source.

Display device and driving circuit for capacitance load thereof

It is an object of the invention to provide a liquid crystal display device that can realize a driving method reducing the power consumption of a driving circuit in a condition that real-time processing is available. In a liquid crystal display device, SWis controlled such that pixel data on odd lines are written in a first RAM (), pixel data on even lines are written in a second RAM () for ist line to 11th line, and pixel data on 12th line are transferred to a latch circuit () directly. In a liquid crystal display device, SWis controlled such that pixel data on odd lines are written in the second RAM (), pixel data on even lines are written in the first RAMfor 13th line to 23rd line, and pixel data on 24th line are transferred to a latch circuit () directly. Pixel data written in the first and second RAMs () are output to source driver (), which performs time-series operating process, through the latch circuit ().

Liquid crystal display device

An image display device having a voltage supplying device generating a first changing voltage for setting a transistor to an on-state and a second changing voltage for setting a transistor to an off-state to operate so as to establish a first supply mode, a second supply mode and a third supply mode to a plurality of gate buses for determining the corrected common electrode voltage.

Growing community of inventors

Kobe, Japan

Masakatsu Yamashita