TOUCH DISPLAY DEVICE

• US 20150160761A1
• Filed: 12/08/2014
• Published: 06/11/2015
• Est. Priority Date: 12/09/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: LEE, Jong-Hyun, KIM, Hong-Chul
• Granted Patent: US 9,880,677 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

A touch display device includes: a touch display panel including a display region and a non-display region; gate lines and data lines crossing each other to define a pixel region in the display region; a thin film transistor in the pixel region and connected to the corresponding gate and data lines; a touch block having a plurality of pixel regions; a touch line connected to the touch block; a touch display driver IC that supplies a gate signal, a data signal and a common voltage to the pixel region, and supplies a touch scan signal to the touch block; a flexible printed circuit board that transfers timing signals and image data from an external system to the touch display driver IC; and a memory mounted on the flexible printed circuit board.

Claims

1. A touch display device, comprising:

a touch display panel including a display region and a non-display region;

gate lines and data lines crossing each other to define a pixel region in the display region;

a thin film transistor in the pixel region and connected to corresponding gate and data lines;

a touch block having a plurality of pixel regions;

a touch line connected to the touch block;

a touch display driver IC that supplies a gate signal, a data signal and a common voltage to the pixel region, and supplies a touch scan signal to the touch block;

a flexible printed circuit board that transfers timing signals and image data from an external system to the touch display driver IC; and

a memory mounted on the flexible printed circuit board.

2. The device of claim 1, wherein the touch line is parallel with the data lines.

3. The device of claim 1, wherein the touch display driver IC includes:

a data driver that selects a reference voltage corresponding to the image data input thereto in response to a data control signal, and outputs the selected reference voltage as the data signal to the data lines;

a gate driver that outputs a gate signal in response to a gate control signal to the gate lines;

a signal generating portion that generates the touch scan signal and a touch clock signal;

an analog-to-digital converter that converts a RC delay of signal, which is caused due to a resistance of the touch line and a parasitic capacitance between the touch line and the gate lines, into a signal delay data; and

a microcontroller unit that decides whether a touch occurs or not, compares the signal delay data with a reference data stored in the memory, compensates for the touch scan signal according to the compared result, and supplies the compensated touch scan signal to the touch block.

4. The device of claim 3, wherein the memory includes:

a touch firmware storing portion that stores a firmware for a touch driving;

a reference data storing portion that stores the reference data; and

a driver firmware storing portion that stores a driver firmware for an image output.

5. The device of claim 1, wherein the touch display driver IC and the memory communicate with each other in a SPI communication method.

6. The device of claim 3, wherein the display region is connected to the touch display driver IC through link lines,

wherein the touch display driver IC is connected to the flexible printed circuit board through connection lines,

wherein the link lines include a gate link line and a data link line connected to the gate lines and the data lines, respectively, and a touch link line connected to the touch line to supply the touch scan signal and transfer a touch sensing signal,

wherein the connection lines include four lines for a SPI communication between the touch display driver IC and the memory, and one line for loading the reference data onto the microcontroller unit.