GB2173625A - A liquid crystal display device - Google Patents

A liquid crystal display device Download PDF

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Publication number
GB2173625A
GB2173625A GB08509183A GB8509183A GB2173625A GB 2173625 A GB2173625 A GB 2173625A GB 08509183 A GB08509183 A GB 08509183A GB 8509183 A GB8509183 A GB 8509183A GB 2173625 A GB2173625 A GB 2173625A
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GB
United Kingdom
Prior art keywords
liquid crystal
display device
crystal display
foil
legend
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.)
Granted
Application number
GB08509183A
Other versions
GB8509183D0 (en
GB2173625B (en
Inventor
David Roderick Lloyd
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.)
RACE ELECTRONICS Ltd
Original Assignee
RACE ELECTRONICS Ltd
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 RACE ELECTRONICS Ltd filed Critical RACE ELECTRONICS Ltd
Priority to GB08509183A priority Critical patent/GB2173625B/en
Publication of GB8509183D0 publication Critical patent/GB8509183D0/en
Publication of GB2173625A publication Critical patent/GB2173625A/en
Application granted granted Critical
Publication of GB2173625B publication Critical patent/GB2173625B/en
Expired legal-status Critical Current

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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
    • G02F1/133385—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 with cooling means, e.g. fans

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (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)

Abstract

The invention relates to a liquid crystal display device 1 wherein there is means in the form of a laminate 2 of metal foil e.g. of aluminium for dissipating incident heat energy so that a desired contrast ratio between the legend 3 and the background 5 is maintained and the legend is visible. The metal foil laminate 2 is in the form of a strip which is secured by suitable means such as adhesive to a major surface 4 of the device 1 through which the legend 3 is viewed, at the perimeter 6 thereof. There is a metallic heat sink 7 at each end of the liquid crystal display device 1, so that heat is conducted rapidly from the device 1 through the foil 2 to which the heat sinks 7 are connected. <IMAGE>

Description

SPECIFICATION A liquid crystal display device The invention relates to a liquid crystal display device.
Liquid crystal display devices usually display numerals or other legends which are visible as a black figure against a greyish background.
The liquid crystal display device displays the required legend(s) in response to electronic input, and the legends are rendered visible by maintaining a desired contrast ratio between the background and the legend(s). This contrast ratio is usually maintained by altering the applied voltage and/or keeping the device cool. However, it sometimes happens that the device is used in a situation where it is subject to incident heat energy, and the contrast ratio is altered. In the extreme, the ratio is such that both legend(s) and the ground become black, so the legend(s) cannot be distinguished at all.
Accordingly it is an object of the invention to seek to mitigate this disadvantage.
According to the invention there is provided a liquid crystal display device, wherein there is means to dissipate incident heat energy so that the desired contrast ratio is maintained.
The heat dissipating'means may comprise a metal foil.
The foil may preferably be positioned at or adjacent the perimeter of the liquid crystal display device, preferably on the surface through which the display is viewed.
The means may comprise a laminate of two metal foils. The two foils may be secured together by an adhesive.
The or each foil may be aluminium foil, preferably 20 thick.
The means may comprise part of a heat sink.
The heat sink may comprise a metal or metallic conductor at one or more sides of the device.
A liquid crystal display device embodying the invention is hereinafter described, by way of example, with reference to the accompanying drawings, in which: Figure 7 is a schematic plan view of a liquid crystal display device according to the invention; and Figure 2 is, to a much smaller scale, a schematic view of a use of the device shown in Figure 1.
Referring to the drawings, there is shown a liquid crystal display device 1 wherein there is means in the form of a laminate 2 of metal foil for dissipating incident heat energy so that a desired contrast ratio between the legend 3 and the background 5 is maintained, so that the legend is visible.
The metal foil laminate 2 is in the form of a strip which is secured by suitable means such as adhesive to a major surface 4 of the device 1 through which the legend 3 is viewed, at the perimeter 6 thereof. The laminate 2 is at the perimeter 6 of the surface just inboard thereof so as not to obscure the viewing area, and thus the legend 3.
There is a metallic heat sink 7 at each end of the (generally rectangular) liquid crystal display device 1, so that heat is conducted rapidly from the device 1 through the foil 2 to which the heat sinks 7 are connected.
The laminate 2 is made up of two layers of aluminium foil each 20 > thick and secured together by adhesive.
In use, any heat energy incident on the device 1 is dissipated by the highly heat conductive foil so that the heat energy does not alter the desired contrast ratio of the liquid crystal display device so that the legend 3 remains visible.
This result is particularly useful on applications like that shown in Figure 2, where the liquid crystal display device 1 is mounted in a fascia 8 of a cooker, the display 1 functioning as a meat probe, in other words indicating the temperature of meat being cooked in the cooker. Heat from the cooker, say from the hobs 9 thereof could affect the contrast ratio of the device 1 and render the legend 3 illegible, but for the foil 2.
The effect of the foil 2 can be demonstrated by taking a display device 1 without the foil, and heating it artificially so that its whole surface becomes black, and the legend 3 illegible. If the foil 2 is now applied to the surface 4, the blackness disappears and the desired contrast ratio is restored, with the legend 3 becoming visible.
1. A liquid crystal display device, wherein there is means to dissipate incident heat energy so that the desired contrast ratio is maintained.
2. A liquid crystal display device according to Claim 1, the heat dissipating means comprising a metal foil.
3. A liquid crystal display device according to Claim 2, the foil being positioned at or adjacent the perimeter of the liquid crystal display device.
4. A liquid crystal display device, the foil being positioned on the surface through which the display device is viewed.
5. A liquid crystal display device according to any preceding claim, the means comprising a laminate of two metal foils.
6. A liquid crystal display device according to Claim 5, the foils being secured together by an adhesive.
7. A liquid crystal display device according to any preceding claim, the or each foil comprising aluminium foil.
8. A liquid crystal display device according to Claim 7, the foil being 20i thick.
9. A liquid crystal display device according to any preceding claim, the means comprising part of a heat sink.
10. A liquid crystal display device according to Claim 9, the heat sink comprising a metal or metallic conductor at one or more sides of the device.
11. A liquid crystal displace device, substantially as hereinbefore described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A liquid crystal display device The invention relates to a liquid crystal display device. Liquid crystal display devices usually display numerals or other legends which are visible as a black figure against a greyish background. The liquid crystal display device displays the required legend(s) in response to electronic input, and the legends are rendered visible by maintaining a desired contrast ratio between the background and the legend(s). This contrast ratio is usually maintained by altering the applied voltage and/or keeping the device cool. However, it sometimes happens that the device is used in a situation where it is subject to incident heat energy, and the contrast ratio is altered. In the extreme, the ratio is such that both legend(s) and the ground become black, so the legend(s) cannot be distinguished at all. Accordingly it is an object of the invention to seek to mitigate this disadvantage. According to the invention there is provided a liquid crystal display device, wherein there is means to dissipate incident heat energy so that the desired contrast ratio is maintained. The heat dissipating'means may comprise a metal foil. The foil may preferably be positioned at or adjacent the perimeter of the liquid crystal display device, preferably on the surface through which the display is viewed. The means may comprise a laminate of two metal foils. The two foils may be secured together by an adhesive. The or each foil may be aluminium foil, preferably 20 thick. The means may comprise part of a heat sink. The heat sink may comprise a metal or metallic conductor at one or more sides of the device. A liquid crystal display device embodying the invention is hereinafter described, by way of example, with reference to the accompanying drawings, in which: Figure 7 is a schematic plan view of a liquid crystal display device according to the invention; and Figure 2 is, to a much smaller scale, a schematic view of a use of the device shown in Figure 1. Referring to the drawings, there is shown a liquid crystal display device 1 wherein there is means in the form of a laminate 2 of metal foil for dissipating incident heat energy so that a desired contrast ratio between the legend 3 and the background 5 is maintained, so that the legend is visible. The metal foil laminate 2 is in the form of a strip which is secured by suitable means such as adhesive to a major surface 4 of the device 1 through which the legend 3 is viewed, at the perimeter 6 thereof. The laminate 2 is at the perimeter 6 of the surface just inboard thereof so as not to obscure the viewing area, and thus the legend 3. There is a metallic heat sink 7 at each end of the (generally rectangular) liquid crystal display device 1, so that heat is conducted rapidly from the device 1 through the foil 2 to which the heat sinks 7 are connected. The laminate 2 is made up of two layers of aluminium foil each 20 > thick and secured together by adhesive. In use, any heat energy incident on the device 1 is dissipated by the highly heat conductive foil so that the heat energy does not alter the desired contrast ratio of the liquid crystal display device so that the legend 3 remains visible. This result is particularly useful on applications like that shown in Figure 2, where the liquid crystal display device 1 is mounted in a fascia 8 of a cooker, the display 1 functioning as a meat probe, in other words indicating the temperature of meat being cooked in the cooker. Heat from the cooker, say from the hobs 9 thereof could affect the contrast ratio of the device 1 and render the legend 3 illegible, but for the foil 2. The effect of the foil 2 can be demonstrated by taking a display device 1 without the foil, and heating it artificially so that its whole surface becomes black, and the legend 3 illegible. If the foil 2 is now applied to the surface 4, the blackness disappears and the desired contrast ratio is restored, with the legend 3 becoming visible. CLAIMS
1. A liquid crystal display device, wherein there is means to dissipate incident heat energy so that the desired contrast ratio is maintained.
2. A liquid crystal display device according to Claim 1, the heat dissipating means comprising a metal foil.
3. A liquid crystal display device according to Claim 2, the foil being positioned at or adjacent the perimeter of the liquid crystal display device.
4. A liquid crystal display device, according to claim 2, the foil being positioned on the surface through which the display device is viewed.
4. A liquid crystal display device, the foil being positioned on the surface through which the display device is viewed.
5. A liquid crystal display device according to any preceding claim, the means comprising a laminate of two metal foils.
6. A liquid crystal display device according to Claim 5, the foils being secured together by an adhesive.
7. A liquid crystal display device according to any preceding claim, the or each foil comprising aluminium foil.
8. A liquid crystal display device according to Claim 7, the foil being 20i thick.
9. A liquid crystal display device according to any preceding claim, the means comprising part of a heat sink.
10. A liquid crystal display device according to Claim 9, the heat sink comprising a metal or metallic conductor at one or more sides of the device.
11. A liquid crystal displace device, substantially as hereinbefore described with reference to the accompanying drawings.
Amendments to the claims have been filed, and have the following effect: (a) Claims 4 above have been deleted or textually amended.
(b) New or textually amended claims have been filed as fol[ows:-
GB08509183A 1985-04-10 1985-04-10 A liquid crystal display device Expired GB2173625B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08509183A GB2173625B (en) 1985-04-10 1985-04-10 A liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08509183A GB2173625B (en) 1985-04-10 1985-04-10 A liquid crystal display device

Publications (3)

Publication Number Publication Date
GB8509183D0 GB8509183D0 (en) 1985-05-15
GB2173625A true GB2173625A (en) 1986-10-15
GB2173625B GB2173625B (en) 1988-10-05

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Family Applications (1)

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GB08509183A Expired GB2173625B (en) 1985-04-10 1985-04-10 A liquid crystal display device

Country Status (1)

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GB (1) GB2173625B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2343982A (en) * 1995-12-27 2000-05-24 Sharp Kk Liquid crystal display has uniform heat dissipation
GB2308716B (en) * 1995-12-27 2000-06-21 Sharp Kk Liquid crystal display element
GB2458995A (en) * 2008-04-11 2009-10-14 Iain Thomas Learmonth Foil-wrapped support frame for LCD

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2159315A (en) * 1984-04-26 1985-11-27 Canon Kk Electrophotographic printers
GB2162333A (en) * 1984-07-20 1986-01-29 Stc Plc Recording spatially modulated light patterns

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2159315A (en) * 1984-04-26 1985-11-27 Canon Kk Electrophotographic printers
GB2162333A (en) * 1984-07-20 1986-01-29 Stc Plc Recording spatially modulated light patterns

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2343982A (en) * 1995-12-27 2000-05-24 Sharp Kk Liquid crystal display has uniform heat dissipation
GB2308716B (en) * 1995-12-27 2000-06-21 Sharp Kk Liquid crystal display element
GB2343982B (en) * 1995-12-27 2000-07-05 Sharp Kk Liquid crystal display element
US6108067A (en) * 1995-12-27 2000-08-22 Sharp Kabushiki Kaisha Liquid crystal display element having opposite signal voltage input directions
GB2458995A (en) * 2008-04-11 2009-10-14 Iain Thomas Learmonth Foil-wrapped support frame for LCD

Also Published As

Publication number Publication date
GB8509183D0 (en) 1985-05-15
GB2173625B (en) 1988-10-05

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Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930410