Electronic device having force touch function comprising a display panel and a force sensing panel disposed entirely below the display panel

• US 10,409,430 B2
• Filed: 06/30/2016
• Issued: 09/10/2019
• Est. Priority Date: 06/30/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Heo, JongGu, Hwang, JongHee
• Primary Examiner(s): Lee, Paul C
• Application Number:
  US15/198,451
• Publication Number:
  US 20170003782A1
• Time in Patent Office: 1,167 Days
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133331 Cover glasses
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• 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 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

An electronic device has a force touch function which is capable of minimizing a degradation of picture quality, wherein the electronic device may include a housing having a receiving space, an image display module disposed in the receiving space, and a force sensing panel disposed between a bottom surface of the housing and the image display module, which enables a user'"'"'s force touch to be sensed through the force sensing panel, and to minimize a degradation of picture quality caused by heat.

Claims

1. An electronic device operable to sense a force of a user'"'"'s touch, the electronic device comprising:

a housing having a receiving space defined by a bottom surface and a sidewall;

an image display module disposed in the receiving space, the image display module including a display panel configured to display an image; and

a force sensing panel configured to sense a force of the touch based on a change in resistance in the force sensing panel and disposed between the bottom surface of the housing and the image display module, the force sensing panel entirely below the display panel,

wherein the force sensing panel is in contact with the bottom surface of the housing and the image display module, and configured to radiate heat from the image display module to the housing.

2. The electronic device according to claim 1, wherein the force sensing panel includes a force sensor whose resistance value is arranged to change in accordance with the force of the user'"'"'s touch, wherein the force sensor is provided between a plurality of first electrodes and a plurality of second electrodes facing each other.

3. The electronic device according to claim 2, wherein the force sensing panel includes:

a first substrate upon which the plurality of first electrodes are disposed;

a second substrate upon which the plurality of second electrodes are disposed;

a plurality of first elastic resistor members, each of the plurality of first elastic resistor members covering and in contact with a corresponding one of the plurality of first electrodes;

a plurality of second elastic resistor members, each of the plurality of second elastic resistor members covering and in contact with a corresponding one of the plurality of second electrodes;

a substrate attachment member attaching the first substrate and the second substrate to each other with a gap provided between the first substrate and the second substrate,

wherein at least a portion of the plurality of first elastic resistor members and the plurality of second elastic resistor members are disposed between the plurality of first electrodes and the plurality of second electrodes.

4. The electronic device according to claim 3, further comprising a radiation member disposed between the bottom surface of the housing and the force sensing panel.

5. The electronic device according to claim 4, wherein a rear surface of the radiation member is attached to the bottom surface of the housing and a front surface of the radiation member is attached to a rear surface of the second substrate facing the bottom surface of the housing.

6. The electronic device according to claim 4, wherein the radiation member is coated onto a rear surface of the second substrate facing the bottom surface of the housing and is attached to the bottom surface of the housing.

7. The electronic device according to claim 3, further comprising a support cover received in the receiving space,

wherein the support cover includes a support plate for supporting the force sensing panel.

8. The electronic device according to claim 7, further comprising a radiation member disposed between the support plate of the support cover and the force sensing panel.

9. The electronic device according to claim 8, wherein a rear surface of the radiation member is attached to the support plate of the support cover and a front surface of the radiation member is attached to a rear surface of the second substrate.

10. The electronic device according to claim 8, wherein the radiation member is coated onto a rear surface of the second substrate facing the support plate of the support cover and is attached to the support plate of the support cover.

11. The electronic device according to claim 4, wherein the radiation member includes graphite.

12. The electronic device according to claim 2, wherein the force sensing panel further includes a spacer disposed between the first and second electrodes.

13. The electronic device according to claim 2, wherein the image display module includes:

a backlight unit provided on the force sensing panel;

wherein the display panel is a liquid crystal display panel provided on the backlight unit; and

a cover window for covering the liquid crystal display panel, the cover window being supported by the sidewall of the housing.

14. The electronic device according to claim 13, wherein the backlight unit includes:

a light guiding plate having a light-incidence portion;

a light source for emitting light to the light-incidence portion;

a reflective sheet disposed between the light guiding plate and the force sensing panel; and

optical sheets provided on the light guiding plate.