IMPLEMENTATION OF DRIVE OF TOUCH FLAT PANEL DISPLAY

• US 20120098776A1
• Filed: 01/04/2012
• Published: 04/26/2012
• Est. Priority Date: 07/08/2009
• Status: Abandoned Application

• Current Assignee: Solution Depot (Shenzhen) Limited
• Original Assignee: Inferpoint Systems Limited
• Inventors: CHEN, Qiliang, LIU, Haiping
• Application Number:
  US13/343,414
• Publication Number:
  US 20120098776A1
• Time in Patent Office: Days
• US Class Current: 345/173
• 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 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A touch flat panel display includes a display screen and a driving circuit; output ends of a display driving circuit in the driving circuit are respectively connected with electrode lines of the display screen through units of a display/touch signal gating-switch and output circuit or a display/touch signal loading and merge circuit. The units of the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit are connected with a touch excitation source through one or more circuit paths; the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit enables more than two electrode lines of a display screen to simultaneously communicate with the touch excitation source for providing touch excitation energy; and the touch system circuit time division detects changes of touch signals on a circuit path connecting the touch excitation source with the electrode lines of the display screen.

Claims

1. A touch flat panel display, comprising a display screen and a driving circuit;

wherein the driving circuit further comprises a display driving circuit and a touch system circuit;

the display driving circuit is provided with a display driving source for providing display driving energy, and a display signal multiplex driving unit;

output ends of the display signal multiplex driving unit in the display driving circuit are respectively connected with input ends of units of a display/touch signal gating-switch and output circuit or a display/touch signal loading and merge circuit; and

output ends of the units of the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit are respectively connected with electrode lines of a display screen, wherein

the units of the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit communicate with a touch excitation source through one or more circuit paths;

the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit enables more than two electrode lines of a display screen to simultaneously communicate with the touch excitation source for providing touch excitation energy; and

the touch system circuit time division detects changes of touch signals on a circuit path connecting the touch excitation source with the electrode lines of the display screen, to judge whether a position of each electrode line of a display screen is touched.

2. The touch flat panel display according to claim 1, wherein p1 the units of the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit enabling the electrode lines of the display screen to communicate with the touch excitation source are connected with the touch excitation source through one circuit path;

and the touch system circuit judges whether the electrode lines of the display screen are touched by detecting changes of the touch signals on the path connecting the units of the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit with the touch excitation source.

3. The touch flat panel display according to claim 1, wherein

the units of the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit enabling the electrode lines of the display screen to communicate with the touch excitation source are connected with the touch excitation source through no less than two circuit paths;

and the touch system circuit judges whether the electrode lines of the display screen are touched by detecting changes of the touch signals on at least one path of the paths connecting the units of the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit with the touch excitation source.

4. The touch flat panel display according to claim 3, wherein

the no less than two paths connecting the units of the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit with the touch excitation source implement gating through a multiplexer.

5. The touch flat panel display according to claim 1, wherein

a detection point for detecting the touch signals by the touch system circuit is disposed on a path connecting the touch excitation source with the units of the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit, or disposed on a path connecting the units of the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit with the electrode lines of the display screen.

6. The touch flat panel display according to claim 5, wherein

the detection point for detecting touch signals is connected with the touch system circuit through a multiplexer.

7. The touch flat panel display according to claim 1, wherein

a touch signal detection unit of the touch system circuit is a passive device, an active device, or a circuit unit formed by multiple elements.

8. The touch flat panel display according to claim 1, wherein

the touch system circuit detects the touch signals on at least one path of the multiple paths connecting the touch excitation source by detecting at least one of a current signal and a voltage signal.

9. The touch flat panel display according to claim 1, wherein the touch system circuit detects the touch signals on at least one path of the multiple paths connecting the touch excitation source by detecting at least one of amplitude, time, phase, frequency signal, and pulse number.

10. The touch flat panel display according to claim 1, wherein

the touch excitation source connected with the electrode lines of the display screen is the same output end of the same touch excitation source, different output ends of the same touch excitation source, or different touch excitation sources.

11. The touch flat panel display according to claim 1, wherein

the touch excitation source is alternating current (AC) power supply or hybrid alternating current/direct current (AC/DC) power supply, and an output waveform is a square ware, a sine wave, a superposed wave of a square wave or a sine wave with DC, or other waveforms.

12. The touch flat panel display according to claim 1, wherein

a frequency of the touch signal output by the driving circuit to the electrode lines of the display screen through the display/touch signal gating-switch and output circuit or the display/touch signal loading and merge circuit is no less than 50 kHz.