Touch display panel, pixel structure and multi-sensing structure

• US 8,674,952 B2
• Filed: 03/18/2010
• Issued: 03/18/2014
• Est. Priority Date: 12/09/2009
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Kao, Kuo-Feng, Kuo, Che-Cheng, Chen, Zeng-De, Lee, Seok-Lyul
• Primary Examiner(s): Karimi, Pegeman
• Application Number:
  US12/726,351
• Publication Number:
  US 20110134053A1
• Time in Patent Office: 1,461 Days
• Field of Search: 345/173, 345/174, 349/12, 349/139, 349/155, 178 1803- 1807
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

A touch display panel which includes a first substrate, a second substrate, at least a multi-sensing structure, a display medium and at least a display controlling device is provided. The multi-sensing structure is disposed between the first substrate and the second substrate, and the multi-sensing structure includes a sensing upper electrode and a plurality of first sensing lower electrodes. The sensing upper electrode is disposed on the second substrate. The first sensing lower electrodes are disposed on the first substrate and electrically connected to each other in series, wherein a plurality of first sensing gaps are designed between the first sensing lower electrodes and the sensing upper electrode, and the first sensing gaps have different distances. The display medium is sandwiched between the first substrate and the second substrate. The display controlling device is disposed on the first substrate for controlling the display medium.

Claims

1. A touch display panel, comprising:

a first substrate;

a second substrate;

a plurality of scan lines and a plurality of data lines, disposed on the first substrate;

a plurality of multi-sensing structures, arranged in an array and disposed between the first substrate and the second substrate, and each of the multi-sensing structures comprising;

a sensing upper electrode, disposed on the second substrate;

a plurality of first sensing lower electrodes, disposed on the first substrate and the first sensing lower electrodes being electrically connected to each other in series, wherein a plurality of first sensing gaps are between the first sensing lower electrodes and the sensing upper electrode, and the first sensing gaps have different distances; and

an active sensing read out device, electrically connected to one of the scan lines correspondingly and the active sensing read out device being electrically connected to the first sensing lower electrodes; and

a sensing signal line, electrically connected to the active sensing readout device, wherein the active sensing readout device comprises a transistor having a gate, a source and a drain, the gate of the transistor is directly connected to one of the scan lines, the source of the transistor is electrically connected to the sensing signal line, and the drain of the transistor is electrically connected to the first sensing lower electrodes;

a display medium, sandwiched between the first substrate and the second substrate; and

a plurality of display controlling devices, disposed on the first substrate and each of the display controlling devices being electrically connected to one of the scan lines and one of the data lines correspondingly for controlling the display medium.

2. The touch panel as claimed in claim 1, wherein the distances of the first sensing gaps are gradually reduced from near the active sensing readout device to far away the active sensing readout device.

3. The touch display panel of claim 1, further comprising a resistor between the first sensing lower electrodes so as to adjust first sensing signals sensed by the first sensing lower electrodes.

4. The touch display panel of claim 1, wherein the multi-sensing structure comprises a plurality of stacked pads disposed under the first sensing lower electrodes, such that the first sensing lower electrodes have different heights so as to form the first sensing gaps having different distances between the sensing upper electrode and the first sensing lower electrodes.

5. The touch display panel of claim 1, wherein the multi-sensing structure comprises a sensing spacer disposed between the second substrate and the sensing upper electrode, such that the sensing upper electrode has different heights so as to form the first sensing gaps having different distances between the sensing upper electrode and the first sensing lower electrodes.

6. The touch display panel of claim 5, wherein the sensing spacer has a slanted surface such that the sensing upper electrode has a thickness which is linearly increased from a side of the sensing upper electrode to another side of the sensing upper electrode, or has a stepped surface such that the sensing upper electrode has a thickness which is stepped-increased from a side of the sensing upper electrode to another side of the sensing upper electrode.

7. The touch display panel of claim 1, wherein the touch display panel has a plurality of sub-pixel regions, and each of the first sensing lower electrodes is disposed in one of the sub-pixel regions.

8. The touch display panel of claim 1, wherein each of the multi-sensing structures is disposed between two of the scan lines which are adjacent to each other.