# Patent

## Title
LED assembly for transparent liquid crystal display

## Abstract

A transparent electronic display assembly is disclosed. The assembly comprises an electronic display and a light guide placed behind the electronic display. The assembly preferably has a front bracket that contacts the front surface of the light guide and a rear bracket that contacts the rear surface of the light guide. The electronic display may be adhered to the brackets. While the light guide may be constrained from movement towards or away from the electronic display by the front and rear brackets, the light guide is generally permitted to move and thermally expand parallel to the electronic display.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. Non-Provisional patent application Ser. No. 14/740,746 filed on Jun. 16, 2015, which claims priority to U.S. Provisional Patent Application No. 62/012,572 filed on Jun. 16, 2014, both of which are hereby incorporated by reference in their entirety.


TECHNICAL FIELD
Embodiments generally relate to LED assemblies for transparent liquid crystal displays (LCD).
BACKGROUND OF THE ART
Display cases are used in a number of different retail establishments for illustrating the products that are available for sale. In some instances these display cases may be coolers or freezers which are placed in grocery stores, convenience stores, gas stations, restaurants, or other retail establishments. In other instances these display cases may be non-refrigerated transparent containers used in a jewelry or watch store, bakery, deli, antique shop, sporting goods store, electronics store, or other retail establishments. While the design and appearance of the product itself does provide some point-of-sale (POS) advertising, it has been found that additional advertising at the POS can increase the awareness of a product and in turn create additional sales.
SUMMARY OF THE EXEMPLARY EMBODIMENTS
An exemplary embodiment provides an LED assembly for a transparent LCD assembly. LEDs are preferably arranged along the top and bottom edges of a two way light guide which permits the light to exit both the front and rear surface of the light guide. The top LEDs are preferably placed in thermal communication with a top thermal plate which is placed in conductive thermal communication with the rear glass. Similarly, the bottom LEDs are preferably placed in thermal communication with a bottom thermal plate which is also placed in conductive thermal communication with the rear glass. The light guide is preferably sandwiched between a front and rear bracket but is permitted to float up/down or left/right (as one observes the image on the LCD) to account for thermal expansion/contraction of the light guide.
The foregoing and other features and advantages of the present invention will be apparent from the following more detailed description of the particular embodiments, as illustrated in the accompanying drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
A better understanding of an exemplary embodiment will be obtained from a reading of the following detailed description and the accompanying drawings wherein identical reference characters refer to identical parts and in which:
FIG. 1 is a perspective view of a display case having an exemplary sealed transparent LCD assembly.
FIG. 2 is a perspective view of the display case of FIG. 1 where the door has been opened.
FIG. 3 is a perspective view of the sealed transparent LCD assembly of FIGS. 1-2.
FIG. 4 is a front planar view of the sealed transparent LCD assembly, showing the section lines A-A and B-B.
FIG. 5 is a section view taken along the section line A-A shown in FIG. 4 and indicating Detail A and Detail B.
FIG. 6 is a section view taken along the section line B-B shown in FIG. 4 and indicating Detail C.
FIG. 7 is a detailed section view of Detail A shown in FIG. 5.
FIG. 8 is a detailed section view of Detail B shown in FIG. 5.
FIG. 9 is a detailed section view of Detail C shown in FIG. 6.
FIG. 10 is a perspective view of a partially assembled exemplary embodiment of a sealed transparent LCD assembly.



DETAILED DESCRIPTION
The invention is described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/ or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Embodiments of the invention are described herein with reference to illustrations that are schematic illustrations of idealized embodiments (and intermediate structures) of the invention. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments of the invention should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
FIG. 1 is a perspective view of a display case having an exemplary sealed transparent LCD assembly 200. Generally, the display case includes a housing 105, to which a door frame assembly 100 is fastened. In this embodiment, a cavity 110 is provided below the door frame assembly 100 where various electronic devices 111 for operating the transparent LCD assembly 200 can be located. The electrical devices 111 may include any or all of the following: timing and control board (TCON), video player, hard drive/storage, microprocessor/CPU, wireless transmitter/receiver, cellular data transmitter/receiver, and internet connectivity. At least some of the electrical devices 111 are in electrical communication with the transparent LCD 230.
FIG. 2 is a perspective view of the display case of FIG. 1 where the door has been opened.
FIG. 3 is a perspective view of the sealed transparent LCD assembly 200 of FIGS. 1-2. Generally speaking, the assembly includes a spacer 300 which is sandwiched between a front glass 225 and rear glass 205. These components are preferably sealed together with an inert gas filling the sealed enclosure. Although not required for every embodiment, argon gas has been found to be preferred in the exemplary embodiments. For sealing these components together, it is preferable to use a hot melt polyurethane. Preferably, the spacer 300 is the Super Spacer® Standard from Quanex in Cambridge, OH. www.quanex.com. In an exemplary embodiment, the spacer 300 would be a flexible foam that contains a desiccant and has a pressure sensitive acrylic adhesive on the front and back edges of the spacer which would be used to bond with the front and rear glass.
FIG. 4 is a front planar view of the sealed transparent LCD assembly, showing the section lines A-A and B-B. FIG. 5 is a section view taken along the section line A-A shown in FIG. 4 and indicating Detail A and Detail B. FIG. 6 is a section view taken along the section line B-B shown in FIG. 4 and indicating Detail C.
FIG. 7 is a detailed section view of Detail A shown in FIG. 5. A top thermal plate 216 is preferably bonded to the rear glass 205. In an exemplary embodiment, the top thermal plate 216 is preferably bonded to the rear glass 205 through adhesive transfer tape. An exemplary adhesive transfer tape for this purpose would be 468 MP, available commercially from 3MTM of St. Paul, Minn. www.3M.com/converter. A printed circuit board (PCB) 246 containing a plurality of LEDs 276 is preferably attached to the top thermal plate 216 and is preferably in conductive thermal communication with the top thermal plate 216 as well. In this way, heat that is generated by the LEDs 276 can be transmitted to the PCB 246, top thermal plate 216, and eventually transferring to the rear glass 205 where the heat can dissipate through natural or forced convection.
The LEDs 276 are placed adjacent to the edge of a light guide 220 which is sandwiched between a rear bracket 211 and a front bracket 236. Generally speaking, the light guide 220 is only constrained from movement towards the front or back of the assembly, but is not contained from movement towards the top or sides of the assembly. In other words, the light guide 220 is secured such that it is capable of thermal expansion/contraction in the X-Y direction (horizontal and vertical when observing the LCD), but is fixed in the Z direction (into/out of the assembly when observing the LCD). It could also be said that the light guide 220 is constrained so that it cannot move towards the front or rear glass but otherwise is permitted to float between the rear bracket 211 and front bracket 236. In an exemplary embodiment, the light guide 220 would be the Acrylite® LED Endlighten product available from Evonik Industries. www.acrylite-shop.com.
Preferably, the light guide 220 would contain microscopic diffuse particulate that is homogeneously scattered throughout the sheet. Also preferably, the light emitted from the LEDs 276 and 275 is permitted to exit both the front and rear surfaces of the light guide 220 (in this way, the light guide 220 could be referred to as a ‘two way light guide’). In an exemplary embodiment, the light is permitted to exit the rear of the light guide 220 so as to illuminate the products within the display case. Thus, it is preferable that the amount of light permitted to exit the rear surface of the light guide 220 is at least 20% of the amount of light permitted to exit the front surface of the light guide 220.
The transparent LCD 230 is preferably attached to a front surface of the front bracket 236 through a layer of adhesive 241 which would preferably be applied around the perimeter of the LCD 230. In an exemplary embodiment, the adhesive 241 would be VHB tape and preferably 5052 VHB Tape available commercially from 3MTM of St. Paul, Minn. www.3M.com.
FIG. 8 is a detailed section view of Detail B shown in FIG. 5. A bottom thermal plate 215 is preferably bonded to the rear glass 205. In an exemplary embodiment, the bottom thermal plate 215 is preferably bonded to the rear glass 205 through adhesive transfer tape. An exemplary adhesive transfer tape for this purpose would be 468 MP, available commercially from 3MTM of St. Paul, Minn. www.3M.com/converter. A printed circuit board (PCB) 245 containing a plurality of LEDs 275 is preferably attached to the bottom thermal plate 215 and is preferably in conductive thermal communication with the bottom thermal plate 215 as well. In this way, heat that is generated by the LEDs 275 can be transmitted to the PCB 245, bottom thermal plate 215, and eventually transferring to the rear glass 205 where the heat can dissipate through natural or forced convection.
The LEDs 275 are placed adjacent to the edge of a light guide 220 which is sandwiched between a rear bracket 211 and a front bracket 236. As discussed at length above, the light guide 220 is preferably only constrained from movement towards the front or back of the assembly, but is not contained from movement towards the top or sides of the assembly.
FIG. 9 is a detailed section view of Detail C shown in FIG. 6.
FIG. 10 is a perspective view of a partially assembled exemplary embodiment of a sealed transparent LCD assembly. This view shows the rear glass 205 with the spacer 300 attached around the perimeter of the glass 205. Also shown is the rear bracket 211 which is attached to the rear glass 205 as well.
The embodiments of the sealed transparent LCD assembly described herein can be used with any number of display case designs, either temperature controlled or not, and with doors that open or glass that remains stationary.
Having shown and described a preferred embodiment of the invention, those skilled in the art will realize that many variations and modifications may be made to affect the described invention and still be within the scope of the claimed invention. Additionally, many of the elements indicated above may be altered or replaced by different elements which will provide the same result and fall within the spirit of the claimed invention. It is the intention, therefore, to limit the invention only as indicated by the scope of the claims.

## Claims

1. A transparent display assembly comprising:
a transparent electronic display adapted to show an image on a front surface thereof;
a light guide positioned behind the transparent electronic display and having a front surface and a rear surface;
a front bracket contacting a surface of the light guide; and
a rear bracket contacting a surface of the light guide;
wherein the light guide is configured to permit a first portion of light to exit the rear surface of the light guide and a second portion of light to exit the front surface of the light guide.

2. The transparent display assembly of claim 1, wherein:
the front bracket contacts the front surface of the light guide.

3. The transparent display assembly of claim 1, wherein:
the rear bracket contacts the rear surface of the light guide.

4. The transparent display assembly of claim 1, wherein:
the front bracket is adhered to a surface of the transparent electronic display.

5. The transparent display assembly of claim 1 further comprising:
a frame assembly, wherein the electronic display, the light guide, the front bracket, and the rear bracket are located within the frame assembly.

6. The transparent display assembly of claim 5, wherein:
the frame assembly is an access panel.

7. The transparent display assembly of claim 6, wherein:
the access panel is attached to a cooler.

8. The transparent display assembly of claim 6, wherein:
the access panel is attached to a product display assembly.

9. The transparent display assembly of claim 1, wherein:
the light guide is constrained from movement towards or away from an intended viewer.

10. The transparent display assembly of claim 1 wherein:
the light guide is free to move towards the top, bottom, or sides of the assembly; and
the light guide is constrained from movement towards the front or the back of the assembly.

11. The transparent display assembly of claim 1, wherein:
the front and rear brackets are configured to permit vertical and lateral thermal expansion of the light guide.

12. The transparent display assembly of claim 1, wherein:
the amount of light permitted to exit the rear surface of the light guide is at least 20% of the amount of light permitted to exit the front surface of the light guide.

13. A transparent display assembly comprising:
an electronic display panel adapted to show an image on a front surface thereof; and
a light guide positioned behind and substantially parallel to the electronic display panel;
wherein the light guide is permitted to move parallel to the electronic display panel but is constrained from movement towards or away from the electronic display panel.

14. The transparent display assembly of claim 13, further comprising:
a front bracket configured to constrain the light guide from movement towards or away from the electronic display panel.

15. The transparent display assembly of claim 14, further comprising:
an adhesive for adhering the electronic display panel to a front surface of the front bracket.

16. The transparent display assembly of claim 13, further comprising:
a rear bracket configured to constrain the light guide from movement away from the electronic display panel.

17. The transparent display assembly of claim 13, further comprising:
a plurality of LEDs positioned to direct light into a perimeter of the light guide.

18. The transparent display assembly of claim 17, wherein:
the light guide is configured such that light from the LEDs may exit a front surface and a rear surface of the light guide.

19. A transparent display assembly comprising:
a transparent electronic display adapted to show an image on a front surface thereof;
a light guide positioned behind the transparent electronic display and having perimeter, a front surface, and a rear surface;
a front bracket contacting the front surface of the light guide;
a rear bracket contacting the rear surface of the light guide; and
a plurality of LEDs arranged to direct light into the perimeter of the light guide;
wherein the light guide is configured such that light from the LEDs may exit a front surface and a rear surface of the light guide.

20. The transparent display assembly of claim 19, wherein:
the front and rear brackets are configured to permit movement and thermal expansion of the light guide vertically and horizontally but constrain the light guide from movement towards or away from the intended viewer.