Double sided laminated liquid crystal display touchscreen and method of making same for use in a wireless communication device

• US 6,259,491 B1
• Filed: 02/06/1998
• Issued: 07/10/2001
• Est. Priority Date: 02/06/1998
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Stinauer, Robert, Ekedahl, Christine Ann
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Hollingshead, Robert J.
• Application Number:
  US09/019,888
• Time in Patent Office: 1,250 Days
• Field of Search: 349/23, 345/173, 178/18
• US Class Current: 349/23
• CPC Class Codes: B32B 17/10027 the glass sheet not being an outer layer
• CPC Class Codes: B32B 17/10165 Functional features of the laminated safety glass or glazing
• 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 3/047 using sets of wires, e.g. crossed wires
• CPC Class Codes: H04M 1/0202 Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets constructional features of telephone transmitters or receivers, e.g. of speakers or microphones H04M1/03
• CPC Class Codes: H04M 1/0266 for a display module assembly
• CPC Class Codes: H04M 2250/22 including a touch pad, a touch sensor or a touch detector digitizers for touch screens G06F3/041

Abstract

A touchscreen (126) for assembly onto a liquid crystal display module (119) in a wireless communication device (103). The touchscreen is comprised of a front laminant pet film (127), a chemically strengthened glass panel (129), an optically clear acrylic adhesive (131) and a rear laminant pet film (133). The rear laminant pet film (133) greatly increases the strength and durability of the touchscreen (126) and eliminates the need for a protective lens over the display module of the wireless communication device (103).

Claims

1. A touchscreen for a liquid crystal display module comprising:

a front laminant;

a circuitry layer disposed underneath the front laminant;

a glass panel disposed underneath the circuitry layer; and

a rear laminant coupled to the glass panel using an adhesive.

2. The touchscreen of claim 1 wherein the front laminant is a pet film.

3. The touchscreen of claim 1 wherein the glass panel is a chemically strengthened glass panel.

4. The touchscreen of claim 1 wherein the adhesive is an optically clear acrylic adhesive.

5. The touchscreen of claim 1 wherein the rear laminant is a pet film.

6. The touchscreen of claim 1 wherein the circuitry layer includes a flex tail for connecting the layer to a microprocessor.

7. A touchscreen for a liquid crystal display module comprising:

a front laminant;

a circuitry layer disposed underneath the front laminant;

a glass panel having a top surface and a bottom surface, the top surface coupled to the circuitry layer with a first layer of adhesive;

a rear laminant coupled to the bottom surface of the glass panel with a second layer of adhesive.

8. A radio communication device including an antenna;

radio circuitry;

a processor;

a display including a touchscreen;

a microphone;

a speaker and a keypad wherein the touchscreen comprises a front laminant;

a glass panel disposed under a surface of the front laminant;

an adhesive applied to a surface of the glass panel; and

a rear laminant applied to the adhesive such that the glass panel and the rear laminant are coupled together.

9. A method of making a touchscreen having a front laminant, a circuitry layer, a glass panel having a top surface and a bottom surface, an adhesive and a rear laminant, the method comprising the steps of:

disposing the front laminant on the circuitry layer;

disposing the circuitry layer on the top surface of the glass panel; and

coupling the rear laminant to the bottom surface of the glass panel with the adhesive.

10. A radio communication device including an antenna;

radio circuitry;

a processor;

a display including a touchscreen; and

a speaker wherein the touchscreen comprises a front laminant;

a glass panel disposed under a surface of the front laminant;

an adhesive applied to a surface of the glass panel; and

a rear laminant applied to the adhesive such that the glass panel and the rear laminant are coupled together.