Embedded touch display device, common voltage supply device and supply method thereof

Abstract

The invention provides an in-cell touch display device, a common voltage supply device and a supply method. The common voltage supply device includes a channel selector and a voltage generator. The channel selector is coupled to the in-cell touch display panel, and is used for selecting and connecting multiple first common voltage blocks to the first channel and connecting multiple second common voltage blocks according to multiple gate line signals To the second channel, wherein the first common voltage block is located on the scanned gate line and the second common voltage block is located on a plurality of unscanned gate lines, and the plurality of gate line signals are respectively scanned The gate lines and the gate lines not being scanned are received. The voltage generator is coupled to the first channel and at least one second channel and provides a first common voltage to the first channel.

Description

technical field

[0001] The invention relates to an embedded touch display device. More specifically, it relates to a common voltage supply device of an in-cell touch display device and a method for providing a common voltage. Background technique

[0002] Please refer to figure 1 , figure 1 A schematic diagram of a common voltage supply device in the prior art is shown. exist figure 1 Among them, the common voltage generating buffer BUF1 is used to provide the common voltage VCOM1 to all the common voltage blocks in the in-cell touch display panel. The common voltage generation buffer BUF1 receives the input voltage VIN, and provides the common voltage VCOM1 to the common voltage block through a path having a resistance value Rr, and the common voltage block has a connection between the source line and the corresponding common voltage block. The parasitic capacitance C1 generated between them. When the in-cell touch display panel is operated, the parasitic capacitor C1...

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