Display driver, display device and driving method

Abstract

A display driver, a display apparatus, and a driving method. The display driver including: a data line driver circuit which drives an output line based on a drive voltage corresponding to display data; a first switching element connected between a first power supply line and the output line; a second switching element connected between a second power supply line and the output line; and a switch control circuit which controls the first and second switching elements. The lengths of first and second periods are determined based on at least part of the display data in a horizontal scanning period which is immediately before a current horizontal scanning period. The first and second switching elements are respectively turned ON and OFF in the first period, and are respectively turned OFF and ON in the second period. After the second period, the first and second switching elements are turned OFF, and the output line is driven by the data line driver circuit.

Description

technical field [0001] The invention relates to a display driver, a display device and a driving method. Background technique [0002] In an active matrix type liquid crystal display device (display device in a broad sense), there is widely known a precharging technique that can speed up liquid crystal driving. In this pre-charging technique, the data line is pre-charged to a given potential before the data line is driven based on the display data, thereby reducing the charging and discharging amount of the data line caused by supplying the driving voltage based on the display data. [0003] This precharging technique is already disclosed in JP-A-10-11032 (Japanese Patent) and JP-A-2002-229525 (Japanese Patent). In JP-A-10-11032, different preset DC potentials are used, and a switch is set between each DC potential and the data line. At the same time, the disclosed pre-charging technology controls the connection between the DC potential and the data line by controlling the...

AI Technical Summary

Problems solved by technology

However, liquid crystal driving requires multiple potentials, so using a new precharge potential will increase the circuit scale

At the same time, when the data line is connected to the pre-charge potential separately, the power consumption will increase significantly

[0007] In addition, in the technique described in Japanese Patent Laid-Open No. 2002-229525, each data line needs a comparison circuit for comparing the display data in the previous horizontal scanning period of the current horizontal scanning period with the display data in the horizontal scanning period. display data, therefore, will result in an increase in circuit scale

In particular, it may not be able to cope with the increase in data lines due to the increase in the size of the display panel

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