GB2562476A - Backlight unit for a display module and manufacturing method thereof - Google Patents
Backlight unit for a display module and manufacturing method thereof Download PDFInfo
- Publication number
- GB2562476A GB2562476A GB1707658.9A GB201707658A GB2562476A GB 2562476 A GB2562476 A GB 2562476A GB 201707658 A GB201707658 A GB 201707658A GB 2562476 A GB2562476 A GB 2562476A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- printed circuit
- circuit board
- backlight unit
- light guide
- 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- Withdrawn
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
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Planar Illumination Modules (AREA)
Abstract
A backlight unit 16 that comprises a printed circuit board 22; a light source 24 mounted on a first surface of the printed circuit board and a light guide 28 configured to conduct light emitted by the light source in the direction of a display unit in order to produce a backlighting beam in a backlighting direction characterized in that the light guide is made of transparent material molded over the first surface of the printed circuit board. The backlight unit 16 may be used in a display module 10 with a display panel 12 such as a liquid crystal display (LCD) panel or a thin-film-transistor (TFT) LCD panel. A method of manufacturing the backlight unit includes overmolding the printed circuit board and the light source with a light guide structure on top side of the printed circuit board. The unit may comprise a plurality of light sources.
Description
(54) Title of the Invention: Backlight unit for a display module and manufacturing method thereof Abstract Title: Backlight Unit with a light guide moulded over a printed circuit board (57) A backlight unit 16 that comprises a printed circuit board 22; a light source 24 mounted on a first surface of the printed circuit board and a light guide 28 configured to conduct light emitted by the light source in the direction of a display unit in order to produce a backlighting beam in a backlighting direction characterized in that the light guide is made of transparent material molded over the first surface of the printed circuit board. The backlight unit 16 may be used in a display module 10 with a display panel 12 such as a liquid crystal display (LCD) panel or a thin-filmtransistor (TFT) LCD panel. A method of manufacturing the backlight unit includes overmolding the printed circuit board and the light source with a light guide structure on top side of the printed circuit board. The unit may comprise a plurality of light sources.
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1/1
Fig.2
Backlight unit for a display module and manufacturing method thereof
TECHNICAL FIELD
The present invention relates to backlight units and display modules including backlight units, preferably for use in automotive applications.
BACKGROUND OF THE INVENTION
Backlight units of today’s Thin-Film-Transistor (TFT) or Liquid Crystal Display (LCD) display modules are using direct or indirect illumination.
Current direct display backlight units are made from light sources like electrical bulbs, Light Emitting Diodes (LED) or gas tubes (e.g. Cold Cathode Fluorescent Lamps) which are located behind a display panel (TFT or LCD). The light source is sending their light directly to the display which is located in line of sight of the display. The housing behind the display panel is typically covered with reflective material, which reflects most of the light which is not all directed to the display. This structure is called “light box” and ensures a suitable efficiency of the display backlight unit. The light box can be molded from reflective material or can be made from sheet based material which will be folded inside the display compartment or can be made by painting of a reflective paint on a non-reflective material.
Lenses might be used on top of the light sources in order to spread the light on top of the light sources. This leads to a better illumination intensity evenness on the display and allows to reduce the distance in between the light source and the display. These lenses are made currently from optically clear plastic material or silicone and are discrete devices (molded in a discrete process). They are typically mounted by screws, clips or are glued to the structure supporting the light source such as the Printed Circuit Board (PCB).
Current indirect display backlight units are also made from light sources like bulbs, LEDs or CCFL tubes, but they are not located in the direct line of sight of the display (TFT or LCD). The light source is sending its light into a light guide device which is changing the direction of the light and directing it to the display panel. All light guide devices are made from optically clear plastic material or silicone and are currently discrete devices. The housing around the light guide and the light sources is typically covered by a reflective material. The light guide together with the light sources and the covering reflective material are typically mounted in a cover which is made from sheet metal. This structure holds the light sources in place in order to optimize the efficiency of the display backlight unit.
Existing backlight units require a relatively complex assembly process since multiple discrete parts need to be assembled in small areas.
The invention will propose a solution to make the assembly simpler, cheaper, while providing a very efficient backlighting of the LCD display.
SUMMARY OF THE INVENTION
The present invention simplifies the structure, the mounting process and improves the efficiency of backlight units by overmolding of printed circuit boards with a combination of optically clear and reflecting materials for illumination purposes. These materials have to be a combination of optically clear and highly reflective silicone, plastic or paint materials which have a sufficient temperature and chemical behavior regarding their melting or curing temperature or/and chemical mixture in order to not damage the printed circuit board, assembled electronic or electric components.
The light guide, which is molded on top of the PCB and the light sources, improves the distribution of the light intensity, might diffuse the light from the light sources in order to have a homogeny light appearance on top of the display and might use typical optical structures like concave/convex lenses, Fresnel lenses or complex optical structures in the pm and/or nm range.
A reflective layer, made from reflective plastic, silicon or paint might be installed underneath the clear light guide layer in order to improve the light guide efficiency by reflecting light into the light box which was heading towards the printed circuit board.
All side walls of the display module housing, which defines the distance in between the printed circuit board and the display, might be from reflective or nonreflective material and can use various materials like plastic, silicon, metal or compound types. The side walls of the display housing will can be molded together with the reflective layer and the transparent light guide in one tool (2K tool or more molding steps) or will be produces as a separate component which will be glued to the printed circuit board and the display via double sided glue tape or dispenses liquid materials.
By overmolding of a printed circuit board and the light sources with a light guide structure on top side of the printed circuit board, which is guiding the light from light sources towards the display, it is possible to (a) improve the illumination intensity evenness and to use a lower number of light sources compared to backlight units with discrete light guides, (b) decrease the distance in between the light source and the display, (c) diffuse the light on top of the light sources in order to improve the illumination intensity evenness, (d) improve the light transfer from the light sources to the display in order to increase the illumination efficiency, (e) directe the light from the light source towards the display in order to influence the optical viewing angle on top of the display, (f) decrease the structural complexity of display backlight unit by reducing the number of optical components (e.g. sparing diffusor/BEF/DBEF films) or (g) save cost of the backlight unit by an optimized manufacturing process.
The overmolded light guide can have a straight or wedge type contour and might use typical optical structures like concave/convex lenses, Fresnel lens structure or complex optical structures in the pm and/or nm range on top and/or bottom side in order to improve the transfer efficiency or/and might diffuse the light from the light guide in order to have a homogeny light appearance on top of the display or/and to change the viewing angle depending light intensity distribution in a given way.
A reflective layer, made from reflective plastic, silicon or paint might be installed underneath the clear light guide layer in order to improve the light guide efficiency by reflecting light into the light box which was heading towards the printed circuit board.
All side walls of the housing, which are defining the distance in between the printed circuit board and the display, might be from reflective or non-reflective material and can use various materials like plastic, silicon, metal or compound types. The side walls of the display housing can be molded together with the reflective layer and the transparent light guide in one tool (2K or more) or can be produces as a separate component which will be glued to the printed circuit board and the display via double sided glue tape or dispense liquid materials.
The present invention proposes a backlight unit, a display module, and a manufacturing method thereof according to the attached set of claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying drawings in which:
- Figure 1 is an axial cross section showing a display module with indirect backlighting according to a first embodiment of the present invention;
- Figure 2 is an axial cross section showing a display module with direct backlighting according to a second embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the following description, parts which are identical or similar may be designated by the same reference.
A first embodiment of the present invention relating to an indirect backlight unit is represented on figure 1. Figure 1 shows a LCD display module 10 comprising a display panel 12 mounted on a housing 14 and a backlight unit 16 mounted on a bottom wall 18 of the housing 14.
Without limitation purpose, a vertical orientation along a main axis Al will be used in the following description.
The housing 14 is for example substantially parallelepiped and the display panel 12 is arranged in the top opening 20 of the housing opposite to the bottom wall 18.
The backlight unit 16 comprises a printed circuit board 22 affixed to the bottom wall 18. A light source 24 such as a light emitting diode or a light emitting tube, or a plurality of light emitting diodes is mounted on a first surface 26, here the top surface, of the printed circuit board 22, in view to provide backlighting to the display panel 12. As the present embodiment relates to indirect backlighting, the light source 24 is arranged on one side of the printed circuit board 22 in view to emit light transversally to the main axis Al, in the direction of a light guide 28 configured to receive the light emitted by the light source 24 and to distribute the light towards the back face 30 of the display panel 12. A backlighting beam is illustrated by the arrows F on figure 1.
The light guide 28 is made of transparent material such as plastic or silicon and is molded over the first surface 26 of the printed circuit board 22. Thus the light guide 28 covers the whole or a major portion of the top surface of the printed circuit board 22, including some electronic components, tracks which are mounted on the top surface of the printed circuit board 22.
According to the present embodiment the light guide 28 has the shape of a panel with a thickness diminishing progressively from the light source side towards the opposite free end. The shape of the light guide 28 is optimized to ensure optimal redirection of the light entering into the light guide 28 through a receiving surface 32 towards the emitting surface 34 at the top surface of the light guide 28. Preferably, the receiving surface 32 is in direct contact with a major portion of the light source 24 to ensure that a maximum amount of light is collected by the light guide 28.
Advantageously, a reflective element 36 such as a reflective layer is arranged on the bottom surface of the light guide 28 to reflect the light inside the light guide 28 towards the emitting surface 34. The reflective layer can be made of reflective plastic material, reflective silicon, or reflective paint.
Alternatively, the reflective element 36 can be made of optical structures forming prisms or facets to redirect the light. Such optical structures can be made by molding.
Advantageously, the emitting surface 34 of the light guide 28 comprises optical diffusing structures 38, such as concave/convex lenses, to optimize diffusion of the light towards the back surface 30 of the display panel 12. These optical diffusing structures 38 are preferably made by the molding process during the molding of the light guide 28 over the printed circuit board 22.
According to the embodiment shown, light transmission foils 40 are arranged within the housing 14 between the light guide 28 and the display panel 12 in view to optimize transmission of the light from the light guide 28 towards the entire display panel 12.
According to an alternative embodiment, the housing 14 can be a frame which is mounted on the first surface 26 of the printed circuit board 22, the printed circuit board 22 forming the bottom wall of the housing 14.
On figure 1, vertical arrows F represent the light emitted through the emitting surface 34 of the light guide 28.
Advantageously, the display panel 12 includes on its top and bottom surfaces some polarization layers 42, 44.
With reference to figure 2, a second embodiment of the present invention will be described wherein the backlight unit 16 is of direct type since the light sources 24 are facing the back surface 30 of the display panel 12. All light sources 24 are typically distributed over the whole area of the display panel 12 in order to allow an even distribution of light over the whole back surface 30 of the display panel 12.
The light sources 24 can be mounted on the top side of the printed circuit board 22 which is facing the display panel 12 or on its bottom side. Holes or cut outs in the printed circuit board 22 allows the light to pass through the printed circuit board 22 if they are located on the bottom side of the printed circuit board
22.
In the second embodiment, the light guide 28 is molded over the entire surface of the printed circuit board 22 and over the reflective layer such that it covers entirely the light sources 24. The light sources 24 can be multiple light emitting diodes and are completely covered by the transparent material constituting the light guide 28.
Advantageously, optical structures 38 are molded on top of each light source 24, for example in the form of convex lenses.
A method of manufacturing a display module 10 according to the first or second embodiment comprises the steps of
- providing a printed circuit board 22 with electronic components and the light sources 24;
- molding a light guide 28 made of transparent material such as plastic or silicon over the top surface of the printed circuit board 22 and over the light sources 24;
assembling the printed circuit board 22 comprising the light guide 28 in a housing 14;
assembling the display panel 12 on the housing 14.
List of references:
10: display module
12: display panel
14: housing
- 16: backlight unit
18: bottom wall
20: opening
22: printed circuit board
- 24: light source
- 26: first surface
- 28: light guide
30: back surface
32: receiving surface
34: emitting surface
- 36: reflective element
- 38: optical diffusing structures
40: light transmission foils
42, 44: polarization layers
Claims (14)
1. A backlight unit comprising:
- a printed circuit board,
- a light source mounted on a first surface of the printed circuit board,
- a light guide configured to conduct light emitted by the light source in the direction of a display unit in order to produce a backlighting beam in a backlighting direction, characterized in that the light guide is made of transparent material molded over the first surface of the printed circuit board.
2. A backlight unit according to claim 1, characterized in that at least one reflective element is arranged between the first surface of the printed circuit board and the light guide.
3. A backlight unit according to claim 2, characterized in that the reflective element comprises a reflective layer made of reflective plastic material, or reflective silicon, or reflective paint.
4. A backlight unit according to claim 2 or 3, characterized in that the reflective element comprises optical reflective structures.
5. A backlight unit according to any one of the preceding claims, characterized in that the light guide comprises on its emitting surface, which is opposite to the printed circuit board, some optical diffusing structures to optimize diffusion of the light in the backlighting direction.
6. A backlight unit according to any one of the preceding claims, characterized in that the light guide is made of silicon or plastic material.
7. A backlight unit according to any one of the preceding claims, characterized in that the light guide is molded over the light source.
8. A backlight unit according to claim 7, characterized in that the light guide covers entirely the light source.
9. A backlight unit according to any one of the preceding claims, characterized in that the light source is a light emitting diode.
10. A backlight unit according to any one of the preceding claims, characterized in that it comprises a plurality of light sources.
11. A backlight unit according to claim 10, characterized in that the light the plurality of light sources is distributed substantially homogenously over the first surface of the printed circuit board.
12. A display module comprising a display panel such as a liquid crystal display (LCD) panel or a thin-film-transistor (TFT) LCD panel, and a backlight unit according to any one of the preceding claims.
13. A method of manufacturing a backlight unit according to any one of claims
1 to 11, comprising the steps of:
- providing a printed circuit board,
- mounting at least one light source on a first surface of the printed circuit board,
- molding a light guide made of transparent material over the first surface of the printed circuit board.
14. A method according to claim 13 comprising the additional step of depositing a layer of reflective material onto the first surface of the printed circuit board before molding the light guide.
Intellectual
Property Office
Application No: GB1707658.9 Examiner: Mrs Rachel Morgans
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1707658.9A GB2562476A (en) | 2017-05-12 | 2017-05-12 | Backlight unit for a display module and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1707658.9A GB2562476A (en) | 2017-05-12 | 2017-05-12 | Backlight unit for a display module and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201707658D0 GB201707658D0 (en) | 2017-06-28 |
| GB2562476A true GB2562476A (en) | 2018-11-21 |
Family
ID=59201512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1707658.9A Withdrawn GB2562476A (en) | 2017-05-12 | 2017-05-12 | Backlight unit for a display module and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2562476A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114442216A (en) * | 2022-01-29 | 2022-05-06 | 深圳创维－Rgb电子有限公司 | Backlight module and display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040041521A1 (en) * | 2002-08-28 | 2004-03-04 | Adaptive Micro Systems, Inc. | Display device with molded light guide |
| WO2010122233A1 (en) * | 2009-04-24 | 2010-10-28 | Valtion Teknillinen Tutkimuskeskus | User input arrangement and related method of manufacture |
| EP2322962A1 (en) * | 2009-11-17 | 2011-05-18 | Weidmann Plastics Technology AG | Decorating element with an optical light guide |
| GB2500037A (en) * | 2012-03-08 | 2013-09-11 | Tactotek Oy | An integrated light guide. |
-
2017
- 2017-05-12 GB GB1707658.9A patent/GB2562476A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040041521A1 (en) * | 2002-08-28 | 2004-03-04 | Adaptive Micro Systems, Inc. | Display device with molded light guide |
| WO2010122233A1 (en) * | 2009-04-24 | 2010-10-28 | Valtion Teknillinen Tutkimuskeskus | User input arrangement and related method of manufacture |
| EP2322962A1 (en) * | 2009-11-17 | 2011-05-18 | Weidmann Plastics Technology AG | Decorating element with an optical light guide |
| GB2500037A (en) * | 2012-03-08 | 2013-09-11 | Tactotek Oy | An integrated light guide. |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201707658D0 (en) | 2017-06-28 |
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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) |