WO2001061972A1 - Mobile telephone with lcd module and emi shielding - Google Patents
Mobile telephone with lcd module and emi shielding Download PDFInfo
- Publication number
- WO2001061972A1 WO2001061972A1 PCT/GB2001/000663 GB0100663W WO0161972A1 WO 2001061972 A1 WO2001061972 A1 WO 2001061972A1 GB 0100663 W GB0100663 W GB 0100663W WO 0161972 A1 WO0161972 A1 WO 0161972A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light guide
- display
- mobile telephone
- emi shielding
- metallic layer
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/22—Illumination; Arrangements for improving the visibility of characters on dials
Definitions
- This invention relates to a mobile telephone and in particular to a mobile telephone with EMI (Electro- Magnetic Interference) shielding.
- EMI Electro- Magnetic Interference
- the term 'mobile telephone' used in this patent specification should be expansively construed to cover any kind of mobile device with communications capabilities and includes radio telephones, smart phones, communicators, and wireless information devices. It includes devices able to communicate using not only mobile radio such as GSM or UMTS, but also any other kind of wireless communications system, such as Bluetooth.
- EMI Electro-Magnetic Interference
- the LCD display of a typical GSM mobile telephone overlies several printed circuit board components which emit electro-magnetic waves. Consequently, some kind of shielding has to be provided to prevent the propagation of these electro-magnetic waves through the display or through the radio section of the phone. Normally this is achieved by placing a metallic shield, or a plastic part coated with metallic paint, over these printed circuit board components. Over the shield or metallised plastic part is then placed a light guide and over the light guide is placed the display itself. At one or more sides of the light guide are placed LEDs : the light guide diffuses the light from the LEDs so that the display is uniformly backlit. This conventional structure works well in terms of shielding and backlighting.
- a mobile telephone comprises a display, a light guide positioned behind the display to allow the display to be backlit, and is characterised m the light guide including a metallic layer providing EMI shielding.
- the present invention contemplates combining or integrating the EMI shielding function into the light guide.
- the metallic layer may be a thin layer of metallised plastic applied to a rear surface of the light guide, the light guide having a front surface adjacent to the display and a rear surface whose external side faces away from tne display.
- a 20 - 50 micron layer is adequate.
- the metallic layer may also be integral with the light guide; for example, the light guide may be made wholly or partly of material which provides EMI shielding.
- a light guide positionable behind a display in a mobile telephone characterised in the light guide includes a metallic layer providing EMI shielding.
- Figure 1 is a schematic cross-section through a light guide LCD panel structure in accordance with the present invention
- Figures 2 and 3 are perspective drawings of a light guide LCD panel structure.
- a LCD 1 overlies a conventional plastic light guide 2.
- the light guide 2 includes light diffusing surface 3, so that light from LEDS 4 are scattered from the light diffusing surface 3 up through LCD 1 to backlight the LCD 1.
- the rearward face of the light guide 2 is coated with a thin, 20 -50 micron, layer 5 of metallic paint.
- the metallic paint layer 5 operates as an EMI shield, preventing the electro-magnetic waves propagating from the PCB and related components indicated generally at 6 from passing out through the display 1.
- the metallic paint is of conventional constitution and applied using conventional techniques, which will be familiar to the skilled implementer.
- Figure 2 shows the underside of the light guide 2, indicating the area of metallic shielding 5.
- the shielded area pattern is carefully designed to ensure that full shielding takes place and that a shielding loop is set up.
- a large rectangular area is metallised; this area is bounded by four walls of approximate 1mm - 2mm height; the internal faces of each wall is metallised as is its top face.
- Metallised surface 7 on the light guide 2 defines the top faces of the four walls and contacts shielding tracks 8 on the PCB 6 to complete a shielding loop when the light guide is fixed onto the PCB 6.
- Figure 3 shows the PCB 6 (without components) for a GSM mobile telephone; light guide 2 is located onto the PCB 6, with the metallised surface portions 7 of the light guide (not shown in Figure 3, but visible in Figure 2) contacting PCB shielding tracks 8 in the PCB 6.
- the display 1 is shown located onto light guide 2.
- Light guide 2 can be rapidly secured to PCB 6 using five screws as shown.
- the entire light guide assembly 2 is approximately 3mm to 4 mm thick.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001232129A AU2001232129A1 (en) | 2000-02-18 | 2001-02-16 | Mobile telephone with lcd module and emi shielding |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0003948A GB2364158B (en) | 2000-02-18 | 2000-02-18 | Mobile telephone with LCD module with backlight and EMI shielding |
GB0003948.7 | 2000-02-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001061972A1 true WO2001061972A1 (en) | 2001-08-23 |
Family
ID=9886016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2001/000663 WO2001061972A1 (en) | 2000-02-18 | 2001-02-16 | Mobile telephone with lcd module and emi shielding |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2001232129A1 (en) |
GB (1) | GB2364158B (en) |
WO (1) | WO2001061972A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004103049A1 (en) * | 2003-05-13 | 2004-11-25 | Myorigo S.A.R.L. | Rfi/emi shield integrated with display |
EP1603101A1 (en) * | 2004-06-02 | 2005-12-07 | Sony Ericsson Mobile Communications AB | Display |
WO2019237670A1 (en) * | 2018-06-11 | 2019-12-19 | 广州视源电子科技股份有限公司 | Led light bar structure, direct-type backlight display module and display |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2365676B (en) | 2000-02-18 | 2004-06-23 | Sensei Ltd | Mobile telephone with improved man-machine interface |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09251168A (en) * | 1996-03-15 | 1997-09-22 | Ricoh Co Ltd | Liquid crystal display device |
US6006118A (en) * | 1997-12-05 | 1999-12-21 | Ericsson Inc. | Keypad lightguides including compartments |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0482485A (en) * | 1990-07-25 | 1992-03-16 | Sony Corp | Back light for liquid crystal |
JP2797804B2 (en) * | 1992-01-09 | 1998-09-17 | 日本電気株式会社 | Backlight and liquid crystal display |
US5548084A (en) * | 1993-10-04 | 1996-08-20 | Motorola, Inc. | Integrated light pipe for a shielded housing |
JPH0922021A (en) * | 1995-03-31 | 1997-01-21 | Seiko Epson Corp | Liquid crystal display device |
WO1999013627A1 (en) * | 1997-09-05 | 1999-03-18 | Siemens Aktiengesellschaft | Communications transmission device, especially a mobile telephone |
WO2000058778A1 (en) * | 1999-03-26 | 2000-10-05 | Advanced Display Inc. | Lcd device |
-
2000
- 2000-02-18 GB GB0003948A patent/GB2364158B/en not_active Expired - Fee Related
-
2001
- 2001-02-16 AU AU2001232129A patent/AU2001232129A1/en not_active Abandoned
- 2001-02-16 WO PCT/GB2001/000663 patent/WO2001061972A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09251168A (en) * | 1996-03-15 | 1997-09-22 | Ricoh Co Ltd | Liquid crystal display device |
US6006118A (en) * | 1997-12-05 | 1999-12-21 | Ericsson Inc. | Keypad lightguides including compartments |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 01 30 January 1998 (1998-01-30) * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004103049A1 (en) * | 2003-05-13 | 2004-11-25 | Myorigo S.A.R.L. | Rfi/emi shield integrated with display |
EP1603101A1 (en) * | 2004-06-02 | 2005-12-07 | Sony Ericsson Mobile Communications AB | Display |
WO2019237670A1 (en) * | 2018-06-11 | 2019-12-19 | 广州视源电子科技股份有限公司 | Led light bar structure, direct-type backlight display module and display |
Also Published As
Publication number | Publication date |
---|---|
AU2001232129A1 (en) | 2001-08-27 |
GB2364158B (en) | 2004-01-07 |
GB2364158A (en) | 2002-01-16 |
GB0003948D0 (en) | 2000-04-12 |
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