Display device having touch screen panel

• US 9,804,700 B2
• Filed: 11/01/2011
• Issued: 10/31/2017
• Est. Priority Date: 11/25/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Cho, Namkyun, Kwon, Keuksang, Park, Jaehyun
• Primary Examiner(s): Chang, Kent
• Assistant Examiner(s): AU, SCOTT D
• Application Number:
  US13/286,811
• Publication Number:
  US 20120133599A1
• Time in Patent Office: 2,191 Days
• Field of Search: 345173
• 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

Abstract

A display device having a display panel and a touch screen panel is disclosed. The display device includes a display panel driving unit formed on a portion of the rear of the display panel and including a plurality of display panel driving circuits to drive the display panel; a touch screen panel driving unit formed on other portion of the rear of the display panel to be adjacent to the display panel driving unit and including a plurality of touch screen panel driving circuits to drive the touch screen panel; and a connector formed on the display panel driving unit and including a first connector unit connected to at least one of the display panel driving circuits and a second connector unit connected to at least one of the touch screen panel driving circuits.

Claims

1. A display device, comprising:

a display panel;

a touch screen panel on the front of the display panel;

an integration driving board on the rear of the display panel and defining a first area and a second area on a same plane, wherein the integration driving board further includes a display panel driving unit disposed in the first area, a touch screen panel driving unit disposed in the second area, a connector disposed in the first area, and a separator that divides the integration driving board into the first area and the second area to reduce electrical noise coupling from the display panel driving unit to the touch screen panel driving unit;

a main system; and

an integration cable directly connecting the connector to the main system,

wherein the display panel driving unit and the touch screen panel driving unit are connected to the main system through the same connector and the same integration cable,

wherein the connector includes a plurality of pins connected to the display panel driving unit and a plurality of dummy pins connected to the touch screen panel driving unit, and

wherein the touch screen panel driving unit is connected to the plurality of dummy pins of the connector disposed in the first area through wires that extend from the second area to the first area of the integration driving board.

2. The display device according to claim 1, wherein the connector is used to transmit and receive signals between the display panel and the main system and between the touch screen panel and the main system through the integration cable connected to the connector and the main system.

3. The display device according to claim 1, wherein the connector is a low voltage differential signaling connector.

4. The display device according to claim 1, wherein the touch screens panel driving unit comprises:

a first conductive pattern driving circuit, which supplies pulse voltage supplied from a power supply unit to a plurality of first conductive patterns arranged in a first direction with regard to the touch screen panel to scan the plurality of first conductive patterns; and

a second conductive pattern driving circuit, which supplies the pulse voltage supplied from the power supply unit to a plurality of second conductive patterns arranged in a second direction cross over the first direction in such a way to be electrically insulated from the plurality of first conductive patterns; and

scanning the plurality of second conductive patterns.

5. The display device according to claim 4, wherein the display panel driving unit comprises:

a data driving unit, which supplies video data voltage to the data lines of the display panel;

a gate driving unit, which supplies a gate pulse synchronized with the video data voltage to the gate lines of the display panel;

a timing controller, which controls the operating timing of the data driving unit and the gate driving unit based on the timing signal supplied from the outside;

a compensating circuit, which detects common voltage having induced voltage component induced at the common electrode of the display panel by the pulse voltage, supplies another pulse voltage of the same size but in opposite phase with an induction voltage component induced by the pulse voltage, removes the induction voltage component from the common voltage having the induction voltage component, and supplies another common voltage in which the induction voltage component is removed to the common electrode.

6. The display device according to claim 5, wherein the touch screen panel driving unit further comprises:

a touch controller, which generates a plurality of scanning control signals for controlling the first and the second conductive pattern driving circuits to supply the scanning control signals to the first and second inductive pattern driving circuits; and

a touch processor connected to the first and the second conductive patterns and which compares voltage of initial capacitance with voltage of current capacitance of each conductive pattern whenever the pulse voltage is supplied from the first and the second conductive pattern driving circuits to the first and the second conductive patterns, thereby providing the touch controller with a touch recognition signal, a touch non-recognition signal, and a touch position indicating whether to perform a touch operation.

7. The display device according to claim 1, wherein the display panel driving unit includes a timing controller and the touch screen panel driving unit includes a touch controller, wherein the timing controller of the display panel driving unit and the touch controller of the touch screen panel driving unit are provided on the integrated circuit board.

8. The display device according to claim 1, wherein the separator prevents noise from flowing from the display panel driving unit to the touch screen panel driving unit.

9. The display panel according to claim 1, further comprising a compensation circuit disposed between the display panel driving unit and the touch screen panel driving unit to compensate for noise induced by common electrode of the display panel.

10. A display device, comprising:

a display panel;

a touch screen panel on the front of the display panel;

an integration driving board on the rear of the display panel;

a separator that divides the integration driving board into a first area and a second area on a same plane to reduce the coupling of electrical noise between the first area and the second area;

a display panel driving unit disposed in the first area of the integration driving board and including display panel driving circuits to drive the display panel;

a touch screen panel driving unit disposed in the second area of the integration driving board and including touch screen panel driving circuits to drive the touch screen panel;

a connector disposed in the first area of the integration driving board and connected to both the display panel driving unit and the touch screen panel driving unit;

wherein the connector includes a first set of pins connected to at least one of the display panel driving circuits and a second set of pins connected to at least one of the touch screen panel driving circuits, the first set of pins being more than the second set of pins, and

wherein the at least one of the touch screen panel driving circuits is connected to the second set of pins through wires that extend from the second area to the first area of the integration driving board.

11. The display device according to claim 10, wherein the connector includes a third set of pins connected to a back light power supply.