Patent Application
20150177881
This application claims priority to Taiwan Patent Application No. 102147853 filed on Dec. 24, 2013 in the China Intellectual Property Office, the contents of which are incorporated by reference herein.
The present disclosure relates to a touch display panel and a touch display device using the same.
Embedded touch display panels include a liquid crystal panel and a touch sensitive structure embedded in the liquid crystal panel. Parasitical capacitances may be formed in the embedded touch display panel.
Implementations of the present technology will now be described, by way of example only, with reference to the attached figures.
It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features. The description is not to be considered as limiting the scope of the embodiments described herein.
Several definitions that apply throughout this disclosure will now be presented.
The term “substantially” is defined to be essentially conforming to the particular dimension, shape, or other feature that the term modifies, such that the component need not be exact. For example, “substantially cylindrical” means that the object resembles a cylinder, but can have one or more deviations from a true cylinder. The term “comprising” means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in a so-described combination, group, series and the like.
A common electrode layer in a touch display apparatus capable of serving as a driving electrode for displaying images in a display period or serving as a driving electrode for sensing touch operations in a touch sensitive period is described.
The first substrate 110 includes a color filter layer 112 and a touch sensitive electrodes layer 114. In at least one embodiment, the color filter layer 112 is located on a surface of the first substrate 110 adjacent to the liquid crystal layer 130, and the touch sensitive electrodes layer 114 is located on a surface of the color filter layer 112 adjacent to the liquid crystal layer 130.
The second substrate 120 includes a common electrodes layer 122, an insulated layer 124, and a display driving structure 126. In at least one embodiment, the common electrodes layer 122 is located on a surface of the second substrate 120 adjacent to the liquid crystal layer 130, the insulated layer 124 is located on a surface of the common electrodes layer 122 adjacent to the liquid crystal layer 130, the display driving structure 126 is located on a surface of the insulated layer 124 adjacent to the liquid crystal layer 130, and an initial alignment of the liquid crystal layer 130 is a horizontal alignment.
The touch display apparatus 100 further includes a scan driving circuit 142 and a data driving circuit 144. The scan driving circuit 142 is connected to the first driving line 1261 for generating different signals in different period. The data driving circuit 144 is connected to the second driving line 1262 for generating different signals to the second driving line 1262 in different periods. While in displaying period, the scan driving circuit 142 generates a scan driving signal and the data driving circuit 144 generates a data driving signal. While in the touch sensitive period, the scan driving circuit 142 generates a first compensated signal, and the data driving circuit 144 generates a second compensated signal.
In display period, the scan driving circuit 142 orderly generates a plurality of scan driving signals to all of the first driving lines 1261 in a first predetermined time interval, the common electrode layer 122 is being applied by a directed specified voltage which is represented as a common voltage signal, and the data driving circuit 144 orderly generates data driving signals to the second driving lines 1262 in a second predetermined time interval. The switch unit 1264 corresponding to the first driving signal 1261 received the scan driving signal turns on for writing the data signal into the corresponding pixel electrode 1265 by the corresponding second driving line 1262. Thus, the pixel electrode 1265 and the common electrode layer 1222 forms a plane electrical filed for driving the liquid crystals in the liquid crystal layer 130 to rotate in the formed plane, and the touch display apparatus 100 displays images. In other embodiments, the common electrode layer 122 is applied by a square wave alternating voltage with the polarities reversal in turn which is represented as the common voltage signal.
In the touch sensitive period, the scan driving circuit 142 orderly generates the first compensated signals Vb1 to all of the first driving lines 1261 in the first predetermined time interval, the data driving circuit 144 respectively generates the second compensated signals Vb2 to the second driving lines 1262 in the second predetermined time interval, the common electrode layer 122 detects voltage change on the touch sensitive electrodes 1140 for indentifying the touch operations on the touch display apparatus 100 through the corresponding acquiring unit 151 based on received touch controlling signal Vt1. In at least one embodiment, phases and amplitudes of the first compensated signal Vb1, the second compensated signal Vb2, and the touch controlling signal Vt1 are the same. The touch controlling signal Vt1 can be a continues square wave. In other embodiments, the touch controlling signal Vt1 can be a continues sine wave or a continues triangular wave.
Effects of parasitical capacitances formed between the first driving lines 1261 and the common electrode layer 122, the second driving lines 1262 and the common electrode layer 122, and the third driving lines 1263 and the common electrode layer 122 are reduced by the first compensated signal Vb1 and second compensated signal Vb2 while the touch sensitive period, thus the stabilization and the reliability of the touch display apparatus 100 is increased.
In display period, the scan driving circuit 242 orderly generates a plurality of scan driving signals to all of the first driving lines 2611 in a first predetermined time interval, the second electrodes 2220 of the common electrode layer 222 are applied by a direct specified voltage signal which is represented as a common voltage signal, and the data driving circuit 244 orderly generates data driving signals to all of the second driving lines 2612 in a second predetermined time interval. The operational principle of the touch display apparatus 100 in
In the touch sensitive period, the signal generating circuit 270 orderly generates a touch scan signal Vt2 as a touch controlling signal to the teams TX1-TXn in a third predetermined time interval. In at least embodiment, at anytime, a specified team TXi receives the touch controlling signal Vt2, and the at least second electrodes 2220 in the specified team TXi receives the touch controlling signal simultaneously. The scan driving circuit 242 generates the first compensated signal Vb1 to the first driving lines 2261 corresponding to the specified team TXi. In at least one embodiment, phases and amplitudes of the first compensated signal Vb1 and the touch controlling signal Vt1 are the same. The touch controlling signal Vb1 can be a continues square wave. The touch controlling signal includes a plurality of continues pulses. The second driving line 2262 is being applied by a specified direct voltage, such as 0 volt, or being floated.
Effects of parasitical capacitances formed between the first driving lines 2261 and the common electrode layer 222 is reduced by the first compensated signal Vb1 applied to the first driving lines 2261 while the touch sensitive period, thus the stabilization and the reliability of the touch display apparatus 100 is increased.
Effects of parasitical capacitances formed between the first driving lines 2261 and the common electrode layer 222, the second driving lines 2262 and the common electrode layer 222 is reduced by the first compensated signal Vb1 applied to the first driving lines 2261 and the second compensated signal Vb2 while the touch sensitive period, thus the stabilization and the reliability of the touch display apparatus 100 is increased.
The embodiments shown and described above are only examples. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, including matters of shape, size, and arrangement of the parts within the principles of the present disclosure, up to and including the full extent established by the broad general meaning of the terms used in the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102147853 | Dec 2013 | TW | national |
