Patent ID: 8736595
Filing Date: 2014-05-27
Classification: G09G

Abstract:
1. A driving device for an image display device, the driving device comprising: an operational amplifier including a non-inversion input terminal, an inversion input terminal and an output terminal, the operational amplifier being configured to operate as a voltage follower; a capacitor having a first electrode and a second electrode, the first electrode being connected to the non-inversion input terminal of the operational amplifier, the capacitor being configured to accumulate charges corresponding to an offset voltage generated in the operational amplifier; an input terminal to which an image signal is input, a first switch configured to switch a connection between the input terminal and the non-inversion input terminal of the operational amplifier between a connected state and a non-connected state, a second switch configured to switch a connection between a load and the output terminal of the operational amplifier between a connected state and a non-connected state, the load being associated with a pixel of the image display device to which a voltage based on the image signal is to be applied, a third switch configured to switch a connection between the second electrode of the capacitor and the inversion input terminal of the operational amplifier between a connected state and a non-connected state, a fourth switch configured to switch a connection between the second electrode of the capacitor and the input terminal between a connected state and a non-connected state; and a timing controller for controlling the first switch, the second switch, the third switch, and the fourth switch, the timing controller configured to connect the load to the output terminal of the operational amplifier when the image signal is input to the operational amplifier, and, when the charges corresponding to the offset voltage have been accumulated in the capacitor, to connect the image signal to the operational amplifier together with the charges accumulated in the capacitor while the load and the output terminal of the operational amplifier remain connected; wherein the timing controller is controls the first switch, the second switch, the third switch, and the fourth switch such that when the image signal is input to the operational amplifier, the input terminal and the non-inversion input terminal are put into the connected state, the load and the output terminal are put into the connected state, the second electrode of the capacitor and the inversion input terminal are put into the connected state, and the second electrode of the capacitor and the input terminal are put into the non-connected state, so that the image signal is input to the operational amplifier, and such that when the charges corresponding to the offset voltage have been accumulated in the capacitor, the input terminal and the non-inversion input terminal are put into the non-connected state, the load and the output terminal are maintained in the connected state, the second electrode of the capacitor and the inversion input terminal are put into the non-connected state, and the second electrode of the capacitor and the input terminal are put into the connected state, so that the image signal is input to the operational amplifier together with the charges accumulated in the capacitor.