Patent Application
20160351141
The subject matter herein generally relates to a touch display device and a driving method for a touch display device.
Generally, a touch display device can include a display panel, a touch panel and related control circuits. A conventional driving method for a touch display device can divide scanning lines into a plurality of blocks. For each block, display scanning and touch scanning can be done sequentially during a scanning circle. During each touch scanning process, the display scanning can be interrupted, thus, continuity of display may be reduced.
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. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure.
A definition that applies throughout this disclosure will now be presented.
The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series and the like.
Referring to
The touch display panel 10 can include a first substrate 11, a second substrate opposite to the first substrate 11, and a liquid crystal layer 12 arranged between the first substrate 11 and the second substrate 13. The first substrate 11 can be an array substrate and can be named as to a lower substrate. The first substrate 11 can include a first substrate base 111, a driving layer 112, an insulating layer 113, and a common electrode layer 114. The driving layer 112 can be arranged on the first substrate base 111 and covered by the insulating layer 113. The driving layer 112 can include a plurality of pixel electrodes 1120 arranged in a substantially rectangle configuration. The common electrode layer 114 is arranged on the insulating layer 113 and can include a plurality of common electrodes 1140. A horizontal electric field can be generated between the plurality of pixel electrodes 1120 and the plurality of common electrodes 1140, which can drive liquid crystal molecules of the liquid crystal layer 12 to deflect so as to cause the touch display device to display images.
The second substrate 13 can be named as an upper substrate or a color film substrate. The second substrate 13 can include a second substrate base 131 and a touch sensitive electrode layer 132. The touch sensitive electrode layer 132 can include a plurality of touch sensitive electrodes 1320 arranged at regular interval along a first direction. The touch sensitive electrodes 1320 can be configured to detect touch operations on the touch display panel 10. The touch sensitive electrodes 1320 can be configured to operate with the common electrodes 1140 to identify positions where the touch operations are applied.
In the exemplary embodiment, the first substrate base 111 and the second substrate base 131 can be made of transparent glass or plastics. The pixel electrodes 1120, the common electrodes 1140, and the touch sensitive electrodes 1320 can be made of Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO). In at least one exemplary embodiment, the first substrate base 111 and the second substrate base 131 can be made of any suitable materials. The pixel electrodes 1120, the common electrodes 1140, and the touch sensitive electrodes 1320 can be made of any suitable materials.
Referring to
Referring to
The plurality of touch sensitive electrodes 1320 can be spaced arranged along the first direction and can be insulated from each other. The plurality of touch sensitive electrodes 1320 can be intersected insulatively with the plurality of common electrodes 1140. In the exemplary embodiment, the touch sensitive electrodes 1320 can be in a substantially rectangle shape. When the touch sensitive electrodes 1320 and the common electrodes 1140 are powered, sensing capacitance Ct is generated between the touch sensitive electrodes 1320 and the common electrodes 1140 to detect touch operations on the touch display panel 10. Alternatively, the touch sensitive electrodes 1320 can be substituted for some signal lines arranged at the first substrate 11, for example, extra sensing electrodes arranged on the first substrate 11.
Referring to
The sequence controller 21 can be configured to receive horizontal synchronizing signals H from an outside system, output gate control signals GCS to the gate driver 22, output source control signals SCS and image data DATA to the source driver 23, output common voltage control signals CCS to the common voltage generating circuit 24, and output selection signals SS to the selection circuit 26. The sequence controller 21 further can be configured to output touch control signals TCS to the touch sensitive circuit 25.
The gate driver 22 can be coupled to the pixel unit Px through the GLs, and can transmit gate signals GS (also named as scanning signals) to the pixel unit Px through the GLs in response to the gate control signals GCS so as to selectively enable corresponding pixel units PXs. The source driver 23 can be coupled to the pixel unit Px through the SLs, and can transmit the image data DATA to the pixel unit Px through the SLs so as to cause the pixel unit Pxs to display images.
The common voltage generating circuit 24 can be configured to generate common voltages with at least two different waveforms. In the exemplary embodiment, the common voltages with at least two different waveforms can include a first common voltage Vcom1 and a second common voltage Vcom2. The first common voltage Vcom1 can be a direct voltage (DC) with a first constant voltage. The second common voltage Vcom2 can be an alternating voltage (AC) with a voltage varying between a second constant voltage and a third constant voltage. The second common voltage Vcom2 can be served as touch control signals applied to the common electrodes 1140. In the exemplary embodiment, the second constant voltage can be 0V, while the third constant voltage can be 3.5V. In at least one embodiment, the second constant voltage and the third constant voltage can be any other suitable values.
The selection circuit 26 can be coupled to the common voltage generating circuit 24 and be coupled to the common electrodes 1140 through the CLs. The selection circuit 26 can be configured to receive the first common voltage Vcom1 and the second common voltage Vcom2 and to transmit the first common voltage Vcom1 and the second common voltage Vcom2 to corresponding common electrodes 1140 in response to the selection signals SS.
The touch sensitive circuit 25 can be coupled to the touch sensitive electrodes 1320 through touch sensitive lines TLs and to receive touch signals TS in response to the touch control signals TCS. The touch sensitive circuit 25 can be configured to process and analyze the touch signals TS so as to identify a position where a touch operation applied on the touch display panel 10.
Referring to
Referring to
During each display scanning period Ta, the common electrodes 1140 can be applied a constant voltage. While, during each touch scanning period Tb, the common electrodes 1140 can be applied alternating voltages (the touch control signals), thus the touch sensitive circuit 25 can detect touch operations by detecting voltage variation of the touch sensitive electrodes 1320.
For each block, the gate driver 22 can scan the gate lines from an initial scanning line to a last scanning line in sequence during a display scanning period. In the exemplary embodiment, for a selected block including at least two gate lines, the gate driver 22 can select different gate line as an initial scanning line in different drive circles. Alternatively or additionally, for a selected block, the initial scanning lines of two successive display scanning periods can be different from each other.
In the exemplary embodiment, for a selected block, the gate driver 22 can select one of the GLs as the initial scanning line according to the arrangement of the GLs in sequence in different display scanning period. For example, for a selected block S1, there are a plurality of gate lines GL11, GL12, . . . GL1x arranged in sequence. The gate driver 22 can select the first gate line GL11 as the initial scanning line in the first display scanning period T1, select the second gate line GL12 as the initial scanning line in the second display scanning period T2, . . . and select the x gate line GL1x as the initial scanning line in the x display scanting period Tx. In a scanning period successive to the Tx, the gate driver 22 can select the first gate line GL11 as the initial scanning line again.
In at least one exemplary embodiment, the initial scanning line can be selected in a reverse order. For example, for the selected block S1, the gate driver 22 can select the last gate line GL1x as the initial scanning line in the first display scanning period Tx, and select the first gate line GL1x as the initial scanning line in the first display scanting period T1. In a scanning period successive to the Tx, the gate driver 22 can select the last gate line GL1x as the initial scanning line again.
In at least one exemplary embodiment, for a selected block, the gate driver 22 can select one of the gate lines as the initial scanning line in a random order. Additionally, the initial scanning lines of two successive display scanning periods can be different from each other. Referring to
In at least one exemplary embodiment, the gate driver 22 can scan the gate lines sequentially during a display scanning period. The display scanning period can be interrupted and then a touch scanning period begins. The display scanning period can be interrupted at any predefined gate line so that the initial scanning line of the successive display scanning period can be different. Referring to
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 in 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 |
|---|---|---|---|
| 104117352 | May 2015 | TW | national |
