Liquid crystal display device with touch panel

Patent metadata

Field	Value
Publication number	US-9323289-B2
Application number	US-81458310-A
Country	US
Kind code	B2
Filing date	Jun 14, 2010
Priority date	Jun 17, 2009
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

A liquid crystal display device is provided in which a touch panel and a liquid crystal display panel are placed under a front window. A touch-panel flexible wiring substrate is connected to the touch panel, and a main flexible wiring substrate is connected to the liquid crystal display panel. The main flexible wiring substrate includes a touch-panel control IC and a touch-panel electronic component group to control the touch panel. The touch-panel flexible wiring substrate includes only lines. In this configuration, there is only one flexible wiring substrate, or the main flexible wiring substrate, on which the electronic components are mounted. As a result, the production cost of the liquid crystal display device as a whole can be reduced.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
a liquid crystal display panel including a TFT substrate and a color filter substrate;
a backlight;
a resin mold in which the liquid crystal display panel and the backlight are placed;
a touch panel attached to the color filter substrate of the liquid crystal display panel; and
a front window attached to the touch panel,
wherein a main flexible wiring substrate is connected to the liquid crystal display panel,
wherein a touch-panel flexible wiring substrate is connected to the touch panel, said touch-panel flexible wiring substrate being an independent component from the touch panel,
wherein a terminal portion of the touch-panel flexible wiring substrate is directly connected to a connecting portion of the main flexible wiring substrate,
wherein the TFT substrate includes a liquid crystal driver IC,
wherein the main flexible wiring substrate includes an LCD electronic component group,
wherein the main flexible wiring substrate further includes a touch-panel control IC and a touch-panel electronic component group to drive the touch panel,
wherein no electronic components, including the touch-panel control IC and the touch-panel electronic component group to drive the touch panel, are mounted on the touch-panel flexible wiring substrate,
wherein, in a plan view, the touch-panel flexible wiring substrate and the main flexible wiring substrate overlap,
wherein the terminal portion of the touch-panel flexible wiring substrate is located between the touch-panel electronic component group and the LCD electronic component group,
wherein a width of the terminal portion of the touch-panel flexible wiring substrate is narrower than a distance between the touch-panel electronic component group and the LCD electronic component group,
wherein a width of the connecting portion of the touch-panel flexible wiring substrate is wider than the distance between the touch-panel electronic component group and the LCD electronic component group,
wherein the front window covers both of the main flexible wiring substrate and the touch-panel flexible wiring substrate, and
wherein the main flexible wiring substrate is bent and turned around under the front window so that a first portion of the main flexible wiring substrate extends under a second portion of the main flexible wiring substrate to facilitate the front window covering the main flexible wiring substrate.

2. The liquid crystal display device according to claim 1 , wherein the touch panel is of a capacitance type and the liquid crystal display device is configured for mobile electronics devices.

3. The liquid crystal display device according to claim 1 ,
wherein a part of the main flexible wiring substrate branches to form a light emitting diode flexible wiring substrate on which a light emitting diode is mounted,
wherein the light emitting diode flexible wiring substrate is folded behind the resin mold, and
wherein the light emitting diode functions as a light source of the backlight.

4. The liquid crystal device according to claim 1 , wherein the touch-panel flexible wiring substrate includes only wires.

5. A liquid crystal display device comprising:
a liquid crystal display panel including a TFT substrate and a color filter substrate;
a backlight;
a resin mold in which the liquid crystal display panel and the backlight are placed;
a touch panel attached to the color filter substrate of the liquid crystal display panel; and
a front window attached to the touch panel,
wherein a main flexible wiring substrate is connected to the liquid crystal display panel,
wherein a touch-panel flexible wiring substrate is connected to the touch panel, said touch-panel flexible wiring substrate being an independent component from the touch panel,
wherein a terminal portion of the touch-panel flexible wiring substrate is directly connected to a connecting portion of the main flexible wiring substrate,
wherein the TFT substrate includes a liquid crystal driver IC and a touch-panel control IC,
wherein the main flexible wiring substrate includes an LCD electronic component group and a touch-panel electronic component group,
wherein no electronic components, including the touch-panel control IC and the touch-panel electronic component group to drive the touch panel are mounted on the touch-panel flexible wiring substrate,
wherein, in a plan view, the touch-panel flexible wiring substrate and the main flexible wiring substrate overlap,
wherein a width of the connecting portion of the touch-panel flexible wiring substrate is wider than the distance between the touch-panel electronic component group and the LCD electronic component group,
wherein the front window covers both of the main flexible wiring substrate and the touch-panel flexible wiring substrate, and
wherein the main flexible wiring substrate is bent and turned around under the front window so that a first portion of the main flexible wiring substrate extends under a second portion of the main flexible wiring substrate to facilitate the front window covering the main flexible wiring substrate.

6. The liquid crystal display device according to claim 5 , wherein the touch panel is of a capacitance type and the liquid crystal display device is configured for mobile electronics devices.

7. The liquid crystal display device according to claim 5 ,
wherein a part of the main flexible wiring substrate branches to form a light emitting diode flexible wiring substrate on which a light emitting diode is mounted,
wherein the light emitting diode flexible wiring substrate is folded behind the resin mold, and
wherein the light emitting diode functions as a light source of the backlight.

8. The liquid crystal device according to claim 5 , wherein the touch-panel flexible wiring substrate includes only wires.

Assignees

• Oohira Eiji
• Japan Display Inc
• Panasonic Liquid Crystal Displ

Inventors

• Oohira Eiji

Classifications

• G06F3/044

  by capacitive means · CPC title

• G06F1/1643 Primary

  the display being associated to a digitizer, e.g. laptops that can be used as penpads (details related to the relative motion of the display enclosure with respect to the body enclosure, e.g. to move between laptop and tablet PC configuration G06F1/1615) · CPC title

• G06F3/0445 Primary

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title