Mutual-capacitance organic light emitting touch display apparatus

• US 10,268,297 B2
• Filed: 05/07/2017
• Issued: 04/23/2019
• Est. Priority Date: 05/07/2017
• Status: Active Grant

• Current Assignee: Superc-Touch Corporation
• Original Assignee: Superc-Touch Corporation
• Inventors: Lee, Hsiang-Yu, Chin, Shang, Lin, Ping-Tsun, Tu, Chia-Hsun
• Primary Examiner(s): Marinelli, Patrick F
• Application Number:
  US15/588,676
• Publication Number:
  US 20180321778A1
• Time in Patent Office: 716 Days
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• 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: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G09G 3/3225 using an active matrix

Abstract

A mutual-capacitance organic light emitting touch display apparatus includes a thin film transistor substrate, a common electrode layer, an organic light emitting material layer, and at least a touch electrode layer, including a plurality of first touch electrodes arranged along a first direction, and a plurality of second touch electrodes arranged along a second direction; a thin film encapsulation layer; a display controller having a display power source, and electrically connected to a thin film transistor, a pixel electrode and the common electrode layer of the thin film transistor substrate; and a touch controller including a touch power source. The touch controller applies a touch driving signal to a selected first touch electrode, and senses a touch sensing signal at a second touch electrode, and outputs the touch sensing signal to the common electrode layer or a reference point of the display controller by a non-inverting amplifier.

Claims

1. A mutual-capacitance organic light emitting touch display apparatus comprising:

a thin film transistor substrate having a plurality of thin film transistors, a plurality of pixel electrodes, a plurality of gate lines and a plurality of data lines arranged on a surface of the thin film transistor substrate, wherein the thin film transistors are respectively connected to the pixel electrodes, the gate lines and the data lines corresponding to the thin film transistors;

a common electrode layer;

an organic light emitting material layer arranged between the common electrode layer and the thin film transistor substrate;

at least a touch electrode layer arranged on a side of the common electrode layer, and the side opposite to the organic light emitting material layer, the touch electrode layer comprising a plurality of first touch electrodes arranged along a first direction, and a plurality of second touch electrodes arranged along a second direction, wherein the first direction differs from the second direction;

a thin film encapsulation layer arranged between the thin film transistor substrate and the touch electrode layer;

a display controller having a display power source, and electrically connected to the thin film transistors, the pixel electrodes and the common electrode layer;

a touch controller comprising a touch power source, a touch driving signal generator, a touch receiver, and a non-inverting amplifier, wherein during touch sensing operation, the touch driving signal generator sequentially or randomly applies a touch driving signal to a selected first touch electrode, the touch receiver senses a touch sensing signal at a second touch electrode, and the non-inverting amplifier processes the touch sensing signal and sends processed touch sensing signal to a reference point of the display controller, for the touch controller to perform touch sensing,

wherein the display controller and the touch controller have no common current loop therebetween during touch sensing;

wherein the display power source is different from the touch power source;

wherein during touch sensing operation, there is only one single physical connection point between the display controller and the touch controller; and

wherein the reference point of the display controller is a power source output point of the display controller, a grounded point of the display controller, or a driving stage of the display controller.

2. The touch display apparatus of claim 1, wherein the display controller sequentially outputs a scan signal to a gate line, outputs data signal to each of the data lines and outputs a zero voltage signal, negative voltage signal, or positive voltage signal to the common electrode layer for displaying.

3. The touch display apparatus of claim 1, wherein the touch controller further applies a signal with same phase as that of the touch sensing signal to non-selected first touch electrodes or non-selected second touch electrodes.

4. The touch display apparatus of claim 1, further comprising at least a switch arranged between the touch controller and the common electrode layer.

5. The touch display apparatus of claim 1, further comprising at least a switch arranged between the touch controller and the display controller.

6. The touch display apparatus of claim 1, further comprising a touch protection layer arranged on a side of the touch electrode layer, and the side opposite to the organic light emitting material layer, the touch protection layer being a substrate or a cured coating layer.

7. The touch display apparatus of claim 1, wherein the first touch electrodes or the second touch electrodes are transparent conductive electrodes.

8. The touch display apparatus of claim 1, wherein the first touch electrodes or the second touch electrodes are black metal grid touch electrodes.

9. The touch display apparatus of claim 6, further comprising a color filtering layer and a black matrix layer, wherein the color filtering layer and the black matrix layer are arranged between the touch protection layer and the common electrode layer.

10. The touch display apparatus of claim 9, wherein the touch electrodes are metal grid touch electrodes and the metal grid touch electrodes are arranged on positions corresponding to the black matrix layer.

11. The touch display apparatus of claim 1, further comprising an insulation layer arranged between the first touch electrodes and the second touch electrodes.