GB2309573A - Display assembly - Google Patents

Display assembly Download PDF

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Publication number
GB2309573A
GB2309573A GB9626839A GB9626839A GB2309573A GB 2309573 A GB2309573 A GB 2309573A GB 9626839 A GB9626839 A GB 9626839A GB 9626839 A GB9626839 A GB 9626839A GB 2309573 A GB2309573 A GB 2309573A
Authority
GB
United Kingdom
Prior art keywords
display assembly
display
backlight
panel
assembly according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9626839A
Other versions
GB2309573A8 (en
GB9626839D0 (en
Inventor
Michael Owen Mccann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Smiths Group PLC filed Critical Smiths Group PLC
Publication of GB9626839D0 publication Critical patent/GB9626839D0/en
Publication of GB2309573A publication Critical patent/GB2309573A/en
Publication of GB2309573A8 publication Critical patent/GB2309573A8/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D43/00—Arrangements or adaptations of instruments

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Description

1 DISPLAY ASSEMBLIES This invention relates to display, assemblies.
2309573 Displays for military or aircraft use may need to operate satisfactorily at low temperatures. In LC1) displays, it is usual practice for a surface of the LCD panel to have a thin, transparent layer of resistive material, such as indium tin oxide (ITO). which is supplied with electrical power so as to cause resistive heating of the panel. This is used to brino the temperature of the LCD panel rapidly up to a value at which the display can operate efficiently.
Commercial LC1) displays are considerably cheaper than military displays but they 1 1 are only designed to operate at room temperature and, if used at low temperatures, will onh respond relatively slowly. It is not usually practical to apply a heating layer to a preformed commercial LCD display since it requires considerable disassembly and can cause damage to the panel or its associated components.
It is an object of the present invention to provide an improved display assembly.
According to one aspect of the present invention there is provided a display assembly having a backlight, a transparent display panel located in front of the backlight and a diffuser element located between the backlight and the display panel, the diffuser element having on a 2 surface a transparent electrical resistance heating element by which heat can be provided to warm the display panel.
The heating element is preferably on the forward surface of the diffuser element. The display panel is preferably an LC1) panel and the backlight is preferably a fluorescent backlight. The resistance heating element may be of indium tin oxide and the diffuser element may be opaque to infrared radiation. The display assembly preferably includes a temperature sensor arranged to sense the temperature of the display panel, the display assembly supplying power to the heating element only if the sensed temperature is below the preferred minimum operating temperature of the display panel.
An LCD display assembly in accordance with the present invention, will now be described, by way of example, with reference to the accompanying drawing. which is an exploded, perspective view of the assembly.
The assembly has a conventional transparent LC1) matrix display panel 1, although other forms of display panel requiring heating may be used. The panel 1 is connected to an address and driver circuit 2 by which a display representation is produced on the panel in the usual way. The panel 1 is located behind a protective cover glass 3, which may also provide filtering.
A backlight 4, such as a serpentine tube fluorescent lamp or any other conventional source of illumination, is located behind the panel 1. A driver unit 5 is connected to the 1 3 backlight to control illumination in response to a manual input or in response to change in ambient illumination conditions.
Located between the backlight 4 and the panel 1 there is a diffuser 6 in the form of a flat plate of a translucent or frosted material, so as to reduce the effect of any uneven brightness over the surface of the backlight 4. The forward surface 7 of the diffuser 6 differs from conventional diffusers in that it is coated with a thin, transparent layer 8 of indium tin oxide ITO or a similar electrical ly-resi stive material. The layer 8 extends over two metal contact strips 9 and 10 along opposite edges of the surface 7. The contact strips are connected to a power supply 11 by which current is caused to flow through the layer between the strips 9 and 10. A small air gap 12 separates the front of the diffuser 6 from the rear of the LCD panel 1; another small air gap 13 separates the front of the backlight 4 from the rear of the diffuser. The diffuser 6 is preferably opaque to infra-red radiation emitted by the backlight 4 so as to reduce the amount of infra-red radiation emitted from the front of the display; this helps make the display more suitable for use with night-vision goggles.
0:n The driver circuit 2, the driver unit 5 and the power supply 11 may be located in the same housing as the other components of the display assembly or they could be located externally.
In operation, when the display is started, the power supply 11 applies a voltage across the strips 9 and 10 so as to produce heating of the resistive layer 8. The power supply 11 may receive an input from a temperature sensor 15 located to measure the temperature of the LCI) 4 panel 1. If the temperature is high enough for correct operation of the panel, no additional heating is required, so no voltage is applied across the layer 8. After a period of operation. the temperature of the panel may rise sufficiently as a result of the combined effect of the heatinly layer 8, heat from the backlight 4 and an increase in ambient temperature. When this happens. the power supply 11 ceases to supply power to the layer 8 until temperature again falls belti\ the preferred minimum operating temperature of the LC1) panel 1.
The arrangement of the present invention enables heating to be provided to 0 commercial display panels without the need to modify the display panel itself. The resistiVe heating layer 8 also has the advantage of providing some electromagnetic screening for the c backlight 4, which can be a source of electromagnetic interference, the front of the backlight not being shielded by the housing of the assembly.

Claims (9)

  1. A display assembly having a backlight, a transparent display panel located in front of the backlight and a diffuser element located between the backlight and the display panel, wherein the diffuser element has on a surface a transparent electrical resistance heating element by which heat can be provided to warm the display panel.
  2. 2. A display assembly according to Claim 1, wherein the heating element is on the forward surface of the diffuser element.
  3. A display assembly according to Claim 1 or 2, wherein the display panel is an LCD panel.
  4. 4. A display assembly according to any one of the preceding claims, wherein the backlight is a fluorescent backlight.
  5. 5. A display assembly according to any one of the preceding claims, wherein the resistance heating element is of indium tin oxide.
    6. A display assembly according to any one of the preceding claims, wherein the diffuser element is opaque to infra red radiation.
  6. 6
  7. 7. A display assembly according to any one of the preceding claims including a 1 - temperature sensor arranged to sense the temperature of the display panel. and wherein the display assembly supplies power to the heating element only if the sensed temperature is below the preferred minimum operating temperature of the display panel.
  8. 8. A display assembly substantially as hereinbefore described with reference to the accompanying, drawings.
  9. 9. Any novel feature or combination of features as hereinbefore described.
GB9626839A 1996-01-23 1996-12-24 Display assembly Withdrawn GB2309573A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB9601269.5A GB9601269D0 (en) 1996-01-23 1996-01-23 Display assemblies

Publications (3)

Publication Number Publication Date
GB9626839D0 GB9626839D0 (en) 1997-02-12
GB2309573A true GB2309573A (en) 1997-07-30
GB2309573A8 GB2309573A8 (en) 1999-07-05

Family

ID=10787384

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9601269.5A Pending GB9601269D0 (en) 1996-01-23 1996-01-23 Display assemblies
GB9626839A Withdrawn GB2309573A (en) 1996-01-23 1996-12-24 Display assembly

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9601269.5A Pending GB9601269D0 (en) 1996-01-23 1996-01-23 Display assemblies

Country Status (5)

Country Link
DE (1) DE19700807A1 (en)
ES (1) ES2118051B1 (en)
FR (1) FR2743926A1 (en)
GB (2) GB9601269D0 (en)
IT (1) IT1289897B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7720555B2 (en) 2005-12-27 2010-05-18 Vega Grieshaber Kg Heating device for a field device display
GB2468934A (en) * 2009-03-25 2010-09-29 Askey Computer Corp Method of heating a liquid crystal panel
EP2876628A3 (en) * 2015-03-06 2015-06-03 Pricer AB Electronic shelf label

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10049273A1 (en) * 2000-09-28 2002-04-11 Siemens Ag Liquid crystal display, especially in a motor vehicle
DE10048804A1 (en) * 2000-09-29 2002-04-25 Siemens Ag LCD display device for use in a motor vehicle uses a disk with a heating layer for heating up an LCD display fitted in front of the disk with plastic to allow the disk to be released.
DE10100672A1 (en) * 2000-12-22 2002-07-11 Siemens Ag Heated LCD display
US6833657B2 (en) 2002-05-13 2004-12-21 Delphi Technologies, Inc. Heating element for fluorescent lamps
DE102013214035B4 (en) * 2013-07-17 2022-10-20 Continental Automotive Technologies GmbH liquid crystal display module
DE102013114736A1 (en) * 2013-12-20 2015-07-09 Endress + Hauser Gmbh + Co. Kg Field device of automation technology and method for ensuring the correct functioning of a field device
CN108415481B (en) * 2018-01-27 2020-11-27 深圳市晶联讯电子有限公司 Low-temperature display control device of liquid crystal display screen
CN116520605B (en) * 2023-07-05 2023-09-08 惠科股份有限公司 Display device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643525A (en) * 1984-12-24 1987-02-17 General Electric Co. Transflective liquid crystal display with integral heating unit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206501A (en) * 1978-06-12 1980-06-03 Motorola, Inc. Apparatus and methods for back illuminating a display surface
US4634225A (en) * 1984-12-24 1987-01-06 General Electric Co. Transflective liquid crystal display with integral heating unit and temperature sensor
US4952783A (en) * 1989-03-20 1990-08-28 W. H. Brady Co. Light transmitting flexible film electrical heater panels
US5146354A (en) * 1991-05-07 1992-09-08 Compaq Computer Corporation LCD system with a backlight having a light source at a light pipe's edge and with the LCD enframed
JPH055867A (en) * 1991-06-27 1993-01-14 Toshiba Corp Liquid crystal display device
US5744819A (en) * 1991-09-20 1998-04-28 Canon Kabushiki Kaisha Liquid crystal display and heater control circuit for use with said display
US6111622A (en) * 1993-03-12 2000-08-29 Ois Optical Imaging Systems, Inc. Day/night backlight for a liquid crystal display
US5436745A (en) * 1994-02-23 1995-07-25 Ois Optical Imaging Systems, Inc. Flex circuit board for liquid crystal display
US5559614A (en) * 1995-05-01 1996-09-24 Motorola, Inc. Liquid crystal display with integral heater and method of fabricating same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643525A (en) * 1984-12-24 1987-02-17 General Electric Co. Transflective liquid crystal display with integral heating unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7720555B2 (en) 2005-12-27 2010-05-18 Vega Grieshaber Kg Heating device for a field device display
GB2468934A (en) * 2009-03-25 2010-09-29 Askey Computer Corp Method of heating a liquid crystal panel
EP2876628A3 (en) * 2015-03-06 2015-06-03 Pricer AB Electronic shelf label

Also Published As

Publication number Publication date
FR2743926A1 (en) 1997-07-25
GB9601269D0 (en) 1996-03-27
ITMI970063A1 (en) 1998-07-15
ES2118051B1 (en) 1999-04-16
GB2309573A8 (en) 1999-07-05
GB9626839D0 (en) 1997-02-12
ES2118051A1 (en) 1998-09-01
IT1289897B1 (en) 1998-10-19
DE19700807A1 (en) 1997-07-24

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)