IN-CELL TOUCH AND DISPLAY APPARATUS, COMMON VOLTAGE PROVIDER, AND PROVIDING METHOD THEREOF

• US 20180335879A1
• Filed: 05/17/2017
• Published: 11/22/2018
• Est. Priority Date: 05/17/2017
• Status: Abandoned Application

• Current Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Original Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Inventors: Wang, Wei-Song, Chang, Yaw-Guang
• Application Number:
  US15/598,010
• Publication Number:
  US 20180335879A1
• Time in Patent Office: Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G09G 2310/0218 with collection of electrodes in groups for n-dimensional addressing
• CPC Class Codes: G09G 2320/0204 Compensation of DC component across the pixels in flat panels
• CPC Class Codes: G09G 2320/0219 Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors

Abstract

The common voltage provider includes a channel selector and a voltage generator. The channel selector is coupled to an in-cell touch and display panel, for selecting to connect a plurality of first common voltage blocks to a first channel, and connect a plurality of second common voltage blocks to at least one second channel according to a plurality gate line signals wherein the first common voltage blocks upon a scanned gate line and the second common voltage blocks upon a plurality of non-scanned gate lines, and the gate line signals are respectively received by the scanned gate line and the non-scanned gate lines. The voltage generator is coupled to the first channel and the at least one second channel, and providing a first common voltage to the first channel.

Claims

1. A common voltage provider, adapted for an in-cell touch and display panel, comprising:

a channel selector, coupled to the in-cell touch and display panel, for selecting to connect a plurality of first common voltage blocks to a first channel, and connect a plurality of second common voltage blocks to at least one second channel according to a plurality gate line signals, wherein the first common voltage blocks are upon a scanned gate line and the second common voltage blocks are upon a plurality of non-scanned gate lines, and the gate line signals are respectively received by the scanned gate line and the non-scanned gate lines; and

a voltage generator, coupled to the first channel and the at least one second channel, and providing a first common voltage to the first channel.

2. The common voltage provider according to claim 1, wherein a capacitance on the first common voltage blocks is smaller than a capacitance on the second common voltage blocks.

3. The common voltage provider according to claim 1, wherein the channel selector comprises:

a plurality of first switches, respectively coupled to a plurality of common voltage block rows and coupled to the first channel commonly, wherein each of the first switches is turned on or cut off by determining whether the corresponding common voltage block row is upon the scanned gate line or not; and

a plurality of second switches, respectively coupled to the common voltage block rows and coupled to the second channel commonly, wherein each of the second switches is turned on or cut off by determining whether the corresponding common voltage block row is upon the scanned gate line or not.

4. The common voltage provider according to claim 3, wherein each of the first switches is turned on if the corresponding common voltage block row is upon the scanned gate line, and each of the second switches is cut off if the corresponding common voltage block row is not upon the scanned gate line;

and

each of the first switches is cut off if the corresponding common voltage block row is not upon the scanned gate line, and each of the second switches is turned on if the corresponding common voltage block row is upon the scanned gate line.

5. The common voltage provider according to claim 3, wherein the common voltage block rows are respectively upon a plurality of gate line signal groups.

6. The common voltage provider according to claim 1, wherein the voltage generator comprises:

a common voltage generating buffer, an output end of the common voltage generating buffer is coupled to the first channel by a first wire, and the output end of the common voltage generating buffer is coupled to the at least one second channel by a second wire, and an input end of the common voltage generating buffer receives an input voltage.

7. The common voltage provider according to claim 1, wherein the voltage generator comprises:

a first common voltage generating buffer, coupled to the first channel and provides the first common voltage to the first channel; and

at least one second common voltage generating buffer, coupled to the at least one second channel and provides a second common voltage to the at least one first channel.

8. The common voltage provider according to claim 1, wherein the voltage generator is coupled to the first channel and provides the first common voltage to the first channel, and is coupled to the second channel and sets the at least one second channel being floated.

9. The common voltage provider according to claim 1, wherein the channel selector is controlled by a switching signal, and the switching signal is generated according to a plurality of gate line signals.

10. An in-cell touch and display apparatus, comprising:

a panel, having a plurality common voltage blocks arranged in an array;

a common voltage provider as claimed in claim 1, coupled to the panel.

11. A common voltage providing method, comprising:

selecting to connect a plurality of first common voltage blocks to a first channel, and connect a plurality of second common voltage blocks to at least one second channel according to a plurality gate line signals by a channel selector, wherein the first common voltage blocks are upon a scanned gate line and the second common voltage blocks are upon a plurality of non-scanned gate lines, and the gate line signals are respectively received by the scanned gate line and the non-scanned gate lines; and

providing a first common voltage to the first channel.

12. The common voltage providing method according to claim 11, wherein a capacitance on the first common voltage blocks is smaller than a capacitance on the second common voltage blocks.

13. The common voltage providing method according to claim 11, further comprising:

providing a second common voltage to the second channel.

14. The common voltage providing method according to claim 11, further comprising:

setting the second channel to be floated.