Touch-sensor-embedded display panel, display device provided therewith, and method for driving touch-sensor-embedded display panel
First Claim
1. A touch-sensor-embedded display panel comprising a plurality of pixel formation portions disposed correspondingly to a plurality of image signal lines and to a plurality of scanning signal lines formed on a first substrate, whereineach pixel formation portion comprises:
- a pixel switching element disposed on the first substrate and having a control terminal connected to a corresponding one of the scanning signal lines;
a pixel electrode disposed on the first substrate and connected to a corresponding one of the image signal lines via the pixel switching element;
common electrodes belonging to a first group or a second group and disposed on a second substrate opposed to the first substrate;
and a pixel capacitance defined between the pixel electrode and the common electrode as an only capacitance for holding a voltage which corresponds to a signal applied to the image signal lines;
whereinthe common electrodes belonging to the first group provide a plurality of driving lines which are driven by driving signals during a touch detection operation whereasthe common electrodes belonging to the second group provide a plurality of sensing lines crossing the driving lines, for receiving a signal responsive to the driving signal during the touch detection operation,the pixel switching element is provided by a thin film transistor which includes a channel layer made of an oxide semiconductor,each pixel formation portion includes;
a first sub-pixel formation portion which includes the pixel switching element, the pixel electrode the common electrode and the pixel capacitance; and
a second sub-pixel formation portion which includes the pixel switching element, the pixel electrode, the common electrode, the pixel capacitance a variation switching element having a control terminal connected to a scanning signal line which immediately follows the scanning signal line that corresponds to the pixel; and
a variation capacitance;
the variation switching element is between the pixel electrode and one end of the variation capacitance, andthe variation capacitance has the other end being connected to an electrode which is provided with a predetermined fixed electric potential at least during the display operation.
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Accused Products
Abstract
There is provided a touch-sensor-embedded display panel with reduced decrease in aperture ratio and reduced increase in frame area, with lowered power consumption and improved operation performance.
A driving pixel (21) is constituted by: a thin film transistor (T1); a pixel electrode (Epix1); a driving common electrode (COM1); and a liquid crystal capacitance (Clc1) which is formed between the pixel electrode (Epix1) and the driving common electrode (COM1). A sensing pixel (22) is constituted by a thin film transistor (T2), a pixel electrode (Epix2), a sensing common electrode (COM2), and a liquid crystal capacitance (Clc2) which is formed between the pixel electrode (Epix2) and the sensing common electrode (COM2). Neither the driving pixel (21) nor the sensing pixel (22) include an auxiliary capacitance. The thin film transistors (T1, T2) have their channel layers formed of IGZO.
10 Citations
3 Claims
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1. A touch-sensor-embedded display panel comprising a plurality of pixel formation portions disposed correspondingly to a plurality of image signal lines and to a plurality of scanning signal lines formed on a first substrate, wherein
each pixel formation portion comprises: -
a pixel switching element disposed on the first substrate and having a control terminal connected to a corresponding one of the scanning signal lines; a pixel electrode disposed on the first substrate and connected to a corresponding one of the image signal lines via the pixel switching element; common electrodes belonging to a first group or a second group and disposed on a second substrate opposed to the first substrate; and a pixel capacitance defined between the pixel electrode and the common electrode as an only capacitance for holding a voltage which corresponds to a signal applied to the image signal lines;
whereinthe common electrodes belonging to the first group provide a plurality of driving lines which are driven by driving signals during a touch detection operation whereas the common electrodes belonging to the second group provide a plurality of sensing lines crossing the driving lines, for receiving a signal responsive to the driving signal during the touch detection operation, the pixel switching element is provided by a thin film transistor which includes a channel layer made of an oxide semiconductor, each pixel formation portion includes; a first sub-pixel formation portion which includes the pixel switching element, the pixel electrode the common electrode and the pixel capacitance; and a second sub-pixel formation portion which includes the pixel switching element, the pixel electrode, the common electrode, the pixel capacitance a variation switching element having a control terminal connected to a scanning signal line which immediately follows the scanning signal line that corresponds to the pixel; and
a variation capacitance;the variation switching element is between the pixel electrode and one end of the variation capacitance, and the variation capacitance has the other end being connected to an electrode which is provided with a predetermined fixed electric potential at least during the display operation. - View Dependent Claims (2, 3)
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Specification