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Researchers Submit Patent Application, "Touch Panel, Touch Display Panel and Touch Detection and Display Method", for Approval

March 5, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Yao, Qijun (Shanghai, CN); Ma, Jun (Shanghai, CN), filed on October 18, 2013, was made available online on February 20, 2014.

The patent's assignee is Shanghai Tianma Micro-Electronics Co., Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "Field of the Invention

"The present invention relates to the field of liquid crystal display panels, and more particularly to a touch panel, a display panel equipped with a touch panel, and a method for controlling the same.

"A display terminal with a touch function is increasingly popular, and integration of an active matrix display panel (e.g., a Liquid Crystal Display (LCD), an Organic Light Emitting Diode Display(OLED), etc.) with touch sensors becomes an important issue of research and development. There are on-cell touch screens and in-cell touch screens depending on whether the active matrix display panel is integrated with the touch sensors. An on-cell touch screen is known to have the active matrix display panel and the touch sensors fabricated respectively in two separate modules and then packaged together. A drawback of the on-cell touch screen lies in a large thickness and a high production cost of the entire device into which the touch sensors and the active matrix display panel are packaged. An in-cell touch screen has touch sensors integrated into the active matrix display panel to reduce the thickness and weight of the entire device. However, integration of the touch sensors into the active matrix display panel for the in-cell touch screen may bring some problems. For example, problems may be caused by a parasitic capacitance between two parts, a change in electric field of liquid crystal cells resulting from additional touch sense electrodes, degraded performance of devices, a lowered aperture ratio, etc. Moreover, the touch sensors of most of existing in-cell touch screens have to be fabricated in an extra process, thereby increasing production cost. Fabrication of the touch sensors based on the structure of the active matrix display panel itself can lower the production cost greatly and further lower the thickness of the touch display panel into which the both are integrated.

"FIG. 1 illustrates a schematic structural diagram of touch sensors fabricated from a common electrode layer of a liquid crystal display panel in the related art.

"Referring to FIG. 1, touch sensors are fabricated from a common electrode layer 100 in a liquid crystal display panel integrated with a touch screen in the related art. The common electrode layer 100 includes a plurality of common electrodes 101 arranged in a matrix. To detect a touch, the common electrode layer 100 is divided into drive areas that are spaced apart from each other. The common electrode layer 100 includes a sense area 103 and several drive area segments 102. When the drive area and the sense area 103 work, extra lead lines are needed for common electrodes layer 100 to realize mode shifting. The extra lead lines will increase process complexity and further increase production cost."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "Embodiments of the present invention provide a touch panel, a touch display panel and, a touch detection and display method For solving the foregoing problems.

"According to one embodiment of the present invention, a touch panel includes an array of pixels having a plurality of sets of scan lines, a plurality of sets of data lines intersecting orthogonally with the plurality of sets of scan lines, and a plurality of pixel elements coupled respectively with the plurality of sets of scan lines and the plurality of sets of data lines. The plurality of sets of data lines includes a first type of sets and a second type of sets disposed apart from each other. The touch panel further includes a first scan drive circuit electrically connected with the plurality of sets of scan lines and configured to provide each of the sets of scan lines with a first scan drive signal sequentially set by set, and a touch detection circuit electrically connected with the plurality of sets of data lines and configured to provide the first type of sets of the plurality of sets of data lines with a touch drive signal and to detect a touch sense signal from the second type of sets among the plurality of sets of data lines when each set of scan lines receives the first scan drive signal.

"In order to solve the foregoing problem, an embodiment of the present invention further provides a touch detection method of the touch panel. The touch panel may include in part elements mentioned in sections above. The method includes:

"a step of providing one set of scan lines with a first scan drive signal by a first scan drive circuit (step 1);

"when the scan drive circuit provides the first scan drive signal, a step of providing a first type of sets of a plurality of sets of data lines with a touch drive signal by a touch detection circuit (step 2),

"a step of detecting the touch sense signal from a second type of sets of the plurality of sets of data lines by the touch detection circuit (step 2);

"a step of providing a next set of scan lines with the first scan drive signal by the scan drive circuit (step 3); and

"performing the step of providing the first type of sets of the plurality of sets of data lines with the touch drive signal by the touch detection circuit, and the step of detecting the touch sense signal from the second type of sets of the plurality of sets of data lines by the touch detection circuit (step 2), wherein the two sets of scan lines (the one set of scan lines and the next set of scan lines mentioned above) are adjacent, and the next set of scan lines was not provided with the first scan drive signal.

"According to another embodiment of the present invention, a touch display panel includes an array of pixels having a plurality of sets of scan lines, a plurality of sets of data lines intersecting orthogonally with the plurality of sets of scan lines, and a plurality of pixel elements coupled respectively with the plurality of sets of scan lines and the plurality of sets of data lines. The plurality of sets of data lines includes a first type of sets and a second type of sets disposed apart from each other. The touch display panel also includes a first scan drive circuit electrically connected with the plurality of sets of scan lines and configured to provide each of the sets of scan lines with a first scan drive signal sequentially set by set, and a touch detection circuit electrically connected with the plurality of sets of data lines and configured to provide the first type of sets among the plurality of sets of data lines with a touch drive signal and to detect a touch sense signal from the second type of sets of the plurality of sets of data lines when each set of scan lines receives the first scan drive signal. The touch display panel also includes a second scan drive circuit electrically connected with the plurality of sets of scan lines to provide each set of scan lines with a second scan drive signal after the set of scan lines receives the first scan drive signal, and a data drive circuit electrically connected with the plurality of sets of data lines and configured to provide the plurality of sets of data lines with an image data signal when each set of scan lines receives the second scan drive signal.

"In order to solve the foregoing problem, the present invention further provides a touch detection and display method for a touch display panel (a display panel equipped with a touch panel). The method includes:

"step 1, providing, by a first scan drive circuit, one set of scan lines with a first scan drive signal;

"step 2, when the first scan drive circuit provides the first scan drive signal, applying, by a touch detection circuit, a touch drive signal to a first type of sets of a plurality of sets of data lines, and detecting, by the touch detection circuit, a touch sense signal from a second type of sets of the plurality of sets of data lines;

"step 3, after the first scan drive circuit provides the first scan drive signal, providing, by a second scan drive circuit, the set of scan lines with the second scan drive signal,

"step 4, when the second scan drive circuit provides the second scan drive signal, providing, by the data drive circuit, the plurality of sets of data lines with an image data signal; and

"step 5, providing, by the first scan drive circuit, a next set of scan lines with the first scan drive signal and performing the step 2, wherein the two sets of scan lines (the one set of scan lines and the next set of scan lines mentioned above) are adjacent, and the second set of scan lines was not provided with the first scan drive signal.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 is a schematic structural diagram of fabrication of touch sensors from a common electrode layer of a liquid crystal display panel in the related art;

"FIG. 2A is a schematic structural diagram of a first embodiment of a touch panel according to the present invention;

"FIG. 2B is a schematic structural diagram of a segment of an array of pixels in an optional implementation of a second embodiment of a touch panel according to the present invention;

"FIG. 2C a schematic structural diagram of an optional implementation of the second embodiment of a touch panel according to the present invention;

"FIG. 2D a schematic structural diagram of an optional implementation of the second embodiment of a touch panel according to the present invention;

"FIG. 2E a schematic structural diagram of an optional implementation of the second embodiment of a touch panel according to the present invention;

"FIG. 3 is a flow chart of steps in a second embodiment of a touch detection method of a touch panel according to the present invention;

"FIG. 4A is a schematic structural diagram of a third embodiment of a touch display panel according to the present invention;

"FIG. 4B a schematic structural diagram of an optional implementation of the third embodiment of a touch display panel according to the present invention;

"FIG. 4C a schematic structural diagram of an optional implementation of the third embodiment of a touch display panel according to the present invention;

"FIG. 4D a schematic structural diagram of an optional implementation of the third embodiment of a touch display panel according to the present invention;

"FIG. 4E a schematic structural diagram of an optional implementation of the third embodiment of a touch display panel according to the present invention;

"FIG. 5A is a flow chart of steps in a fourth embodiment of a touch detection and display method of a touch display panel according to the present invention; and

"FIG. 5B is a timing diagram of the fourth embodiment of a touch detection and display method of a touch display panel according to the present invention."

For additional information on this patent application, see: Yao, Qijun; Ma, Jun. Touch Panel, Touch Display Panel and Touch Detection and Display Method. Filed October 18, 2013 and posted February 20, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4338&p=87&f=G&l=50&d=PG01&S1=20140213.PD.&OS=PD/20140213&RS=PD/20140213

Keywords for this news article include: Shanghai Tianma Micro-Electronics Co. Ltd.

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Source: Electronics Newsweekly


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