FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
LOW-POWER BACKLIT DESTINATION SIGNBOARDS FOR BUSES AND METHOD OF MANUFACTURE THEREOF.
Applicant: MG GREY ENGINE LLP
An Indian Company of: 466, FARMAC HOUSE, 14™ ROAD,
+
CHEMBUR, MUMBAI - 400071
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE USED.

LOW-POWER BACKLIT DESTINATION SIGNBOARDS FOR BUSES AND METHOD
OF MANUFACTURE THEREOF
Field of the Invention
The present invention relates to backlit display boards. In particular, it relates to backlit display signboards in automobiles. In particular, the present invention relates to display signboards in buses. The present invention also relates to the method of manufacturing backlit display boards for vehicles.
Background of the Invention
Generally, destination boards are used on buses to display the place where the bus is going. In Indian left-hand driving system, it is convenient to fit this destination board on the left side of the dash board, so that it is visible through the wind shield to facilitateits viewing by passenger/s standing on the left side of the road and facing the incoming bus.
In order to improve visibility at night, such destination boards are required to be illuminated with a reliable method of illumination. Further, in order to remove any ambiguity about the destination of the busin the mind of the waiting passengers/staff, the details written/displayed on these destination boards have to be very clear, well-lit and intelligible.
Prior Art
CN 201078786 Yrelates to an advertisement lamp case brand for buses, including a transparent panel; a POD light guide plate layer; an advertisement lamp sheet between the transparent panel and the POD light guide plate; and LED lamp tubes located surrounding the periphery of the lamp case.

CN 101620810 A discloses an advertising light box that can be placed on a .counter. It includes a frame, a box body arranged thereon and an illuminating device having a transparent panel, an advertising picture, a light homogenizing plate and a base plate attached respectively from front to back. The illuminating device is an LED light strip arranged on the inner wall of the frame and the advertising light box has a small volume and light weight and can be either placed on the table top or suspended from above.
CN 201237870 Y discloses an advertisement lamp box having a frame, a box body and an illuminating device, wherein, the box body is arranged on the frame and having a transparent picture board, an advertisement picture, a uniform light board and a bottom board which are orderly pasted from the front to the back. The illuminating device includes an LED lamp strip arranged on the inner wall of the frame. It can also be placed pn the table top or suspended.
EP 2492899 Al discloses a device for presenting a poster-shaped information holder with lighting having a front sided panel segment and a rear sided panel segment for receiving a poster-shaped information holder. The front sided panel segment is transparent for visibility of the holder. A base installs the panel segments. The rear sided panel segment includes a groove-shaped dump on a front side, where a LED-arrangement is inserted in the dump. The LED-arrangement is attached to a current source via an electrical line. LEDs are positioned in a chain form on a carrier of the LED-arrangement.
However, none of these prior art document addresses the problems with the state of the art discussed below.

Technical Problems with the State of the Art
Generally, non-automotive CFL bulbs are used to illuminate such destination
boards, which are obviously more power-consuming and also prone to frequent
failures. Their enclosure is bulky and heavy and not user friendly. The current
system is also not aesthetically good looking and gives very less flexibility for
good printing.
Therefore, there is felt a need for a more reliable, compact, light-weight and user friendly destination boards, which are illuminated by an efficient and power saving method of illumination.
Although, back-lighting is one of the most reliable and power saving methods of illumination, it was never used in destination boards in the configuration of the present invention as discussed in the following.

Objects of the Invention
Some of the objects of the present disclosure, which at least one embodiment of the present invention satisfies, are as follows:
An object of the present invention is to provide a destination board assembly, which is compact and inexpensive.
Another object of the present invention is to provide a destination board assembly, which is easy to install ©r dismantle.
Yet another object of the present invention is to provide a destination board assembly, which is rugged, water and dust resistant.

Still another object of the present invention is to provide a destination board assembly, which is flexible and thus user friendly.
A further object of the present invention is to provide a destination board assembly, which much lower the power consumption.
A still further object of the present invention is to provide a destination board assembly, which is aesthetically superior.
A yet another object of the present invention is to provide a method of manufacturing the backlit display boards for vehicles.
Other objects and advantages of the present invention will become apparent from the following description, when read with the accompanying figures of the drawings, which are however not intended to limit the scope of the present invention in any way.
Summary of the Invention
In accordance with the present invention, there is provided a low-power backlit signboard for motor vehicles, said signboard comprising:
a. optic panel assembly consists of-
- a light diffuser panel and a light reflector sheet, both provided with at
least one slot each on their longer sides;
- at least one LED strip;
- a light guide panel having a matrix of dots etched on its planar surface;
- a protective sheet,
wherein said panels and sheet are bonded together by means of suitable adhesives in a predefined arrangement; and

b. mounting arrangement consisting of a plurality of top and/or bottom
mounting brackets and/or side mounting brackets screwed to the optic panel
assembly by means of fastening means;
c. sealing arrangement consisting of a plurality of sealing channels bonded
and/or bent to define the profile of the optic panel assembly; and
wherein said optic panel assembly includes a chassis assembly to be mounted on one side thereof, and including a monocoque sheet metal chassis assembled with a LED driver circuit board using high bonding adhesives, a rubber grommet for passage of wire/s of the LED strip/s therethrough.
Typically, said diffuser is a polycarbonate (PC) diffuser panel; said reflector sheet is a polycarbonate (PC) reflector sheet; said light guide panel is a poly(methyl methacrylate) (PMMA) light guide panel and said protective sheet is a polyvinyl chloride (PVC) protective sheet.
Typically, said light guide panel comprises longitudinal slot/s and said diffuser panel and reflector sheet have grooves corresponding to said LED strip/s for accommodating said LED strip/s.
Typically, said side mounting brackets comprise mounting-cum-sliding channels for inserting acrylic media display sheet/s containing a plurality of projections/ depressions centrally located near one of the edges thereof.
Typically, said mounting arrangement comprises a plurality of mounting supports for optic panel assembly and a plurality of inside mounting plates for supporting said optic panel assembly.

Typically, said driver circuit board has an input with a built-in CC driver with reverse polarity protection, said CC driver accepting 12 to 24V DC supply to deliver constant current.
Typically, said Low-power backlit signboard is water resistant and compliant with 1P-54 requirements and its light output in the range of 200-300 lux.
Typically, said low-power backlit signboard is configured for a plurality of mountings, a pedestal mounting or a wall mounting or a roof mounting.
Typically, said low-power backlit signboard acrylic media display sheet/s (MS) includes colorful transparent sheet stickers having the destination and/or pictorial representation thereof on a transparent sheet placed in front of the diffuser panel.
In accordance with the present invention, there is also provided a method of assembly for manufacturing the backlit destination signboard, said method comprises the step of: (a) preparing the optic panel assembly as claimed in claims 1 to 10; which includes - preparing a matrix of small dots etched on the planar surface of said PMMA LG panel acting as secondary source of minute light dots when illuminated by said LED strips on either side, sandwiching said panel between said light diffuser sheet on one side and said reflector sheet on the other side, placing said thin light diffuser with good output efficiency in front of said light panel to generate a homogeneous light along the plane of said light panel, bonding said protective sheet over said reflector sheet, cutting a slot cut on both the longer side of said rectangular panel to accommodate said LED strip/s on at Jeast one side, creating a groove on the walls of said diffuser sheet and said reflector sheets, placing said LED strip/s inside said grove, and holding at a predetermined place, and guiding said wires from said LED strip/s going along

said grove towards said CC driver; (b) mounting said optic panel assembly on said chassis, which includes - mounting the LED driver circuit board onto the designated location on said chassis using high bonding adhesives; and joining the wires from the LED strips to said driver circuit board and bringing said power input cable out of said chassis through said rubber grommet; and (c) sealing said optic panel assembly mounted on said chassis by edge bonding process, which includes - edge bonding two-piece aluminum channel on to the top and bottom half by using a special tool, screwing the mounting brackets on three sides of the board, and joining the edge bands for brackets to also serve as sliding channel for the media sheets.
Brief Description of the Accompanying Drawings
The present invention will now be explained in more detail with reference to the non-limiting accompanying drawings in which:
'Figure 1 illustrates a perspective representation of the backlit destination sign board in accordance with the invention in an exploded view described in more details in Figure 5.
Figures 2 and 2A illustrate perspective views of two different embodiments of the backlit destination sign boards in accordance with the invention as a final product with and without destination display thereon.
Figure 3A, 3B and 3C schematically illustrate the respective front, top and side views of a backlit destination sign board in accordance with the invention shown in Figure 3.

Figure 3D illustrates a detailed sectional view along section-line A-A of the front view shown in Figure 3A.
Figure 4 A illustrates a perspective view of the optic panel assembly of the
backlit destination sign board in accordance with the invention showing its main constituents.
Figure 4B illustrates another perspective view of the optic panel assembly of the backlit destination sign board in accordance with the invention showing its main constituents placed one over the other.
Figure 4C illustrates a partial perspective view of the optic panel assembly of the backlit destination sign board in accordance with the invention showing the arrangement for mounting various, components thereof.
Figure 5 illustrates exploded view of the complete assembly of backlit destination signboard in accordance with the invention shown in Figure 1, indicating all its components in an exploded view.
Figure 6 illustrates the sealing arrangement of the optic panel assembly of the .backlit destination sign board in accordance with the invention showing the arrangement for sealing various components thereof, to avoid any ingress of water/dampness which may be harmful for the assembly.
Detailed Description of the Accompanying Drawings
The backlit destination sign board devised in accordance with the present invention for buses and which will be described in the following with reference to the accompanying drawings, which however, do not limit the scope and ambit

of the present invention. The following description of an exemplary embodiment
of the backlit destination sign board for buses.

Figure 1 illustrates a perspective exploded view of the backlit destination signboard in accordance with the invention. The final assembled product shown in Figures 2 and 2A is described in detail in Figure 5.
Figures 2 and 2A illustrate the perspective representations of two different embodiments of the backlit destination signboard in accordance with the invention in an assembled view. It can be seen that the destination board can be equipped with the destination name where the bus is proceeding and/or a representative photo or depiction to give a pictorial hint of the destination, e.g. the photo of Sri Sai Baba gives an idea of destination SHRDI. This additionally helps passengers to know the bus destination, in case any of them is illiterate or cannot clearly read destination displayed on it.
Figure 3A illustrates the front view of a backlit destination sign board in accordance with the invention shown in Figure 3. A section line A-A is also marked in this figure for explaining sectional view at this sectional plane to show the details of the components of the destination board assembly in the subsequent Figure 5.
Figure 3B illustrates the top view of a backlit destination sign board in accordance with the invention shown in Figure 3 from below. It shows the base of the pedestal mounting board on both sides with central assembly clearly showing the holes by means of which the destination boards can be fixed at the desired optimal location on the side away from the bus driver for ease of reading by the public.

Figure 3C illustrates the side view of a backlit destination sign board in accordance with the invention shown in Figure 3. This shows one of the pedestal mounting brackets having holes for tightening the central assembly of the board duly supported on the base of these brackets.
Figure 3D illustrates a sectional view along section-line A-A of the front view shown in Figure 3A. It clearly shows a front enclosure cover 6, a back enclosure cover 7, two LGP mounting supports 17 and two inside mounting plates 18.
Figure 4A illustrates a perspective exploded view of the light panel or optic panel assembly used in the backlit destination sign board in accordance with the invention. The optic panel assembly includes a polycarbonate (PC) diffuser panel 1, a Poly(methyl methacrylate) or PMMA light guide (LG) panel 2, a polycarbonate (PC) reflector sheet 3, a protective sheet 4 of polyvinyl chloride (PVC), Three layers of adhesives (not visible) are applied between these components, i.e. an adhesive 11 between PC diffuser 1 and PMMA LG panel 2, an adhesive 12 between PMMA LG panel 2 and PC reflector sheet 3, and another adhesive 13 between PC reflector sheet 3 and PVC protective sheet 4.
Figure 4B illustrates another perspective view of the optic panel assembly of the backlit destination sign board in accordance with the invention. It also shows a light diffuser panel 1, a PMMA light guide (LG) panel 2, a light reflector sheet 3, a protective sheet 4 and two LED strips 5. Here, suitable adhesives AD are used for joining above components for forming the light panel as an optic panel assembly. The PMMA LG Panel 2 has a matrix of small dots etched on its planar surface which will act as secondary source of minute right dots when illuminated by the LED strips 5 on either side. The LG panel 2 is sandwiched between a light diffuser sheet 1 on one side and a reflector sheet 3 on the other

side. A thin light diffuser/ light spreader 1 with good output efficiency is placed in front of LG Panel 2 in order to generate a homogeneous light along the plane of the panel. A protective sheet 4 of polycarbonate material is bonded over the reflector sheet 3. The rectangular PMMA LG Panel 2 has a slot cut on both of its longer side enough to accommodate a LED strip 5 on both the sides as shown in the figure. The walls of the Diffuser panel 1 and the reflector sheet 3 will create a groove to hold the LED strips 5 on place as shown in the figure. The LED strips 5 are placed inside this groove with the LEDs through panel. The wires from the LED strips 5 will be guided to go along the groove towards the LED driver circuit as shown in the figure.
Figure 4C illustrates a partial perspective view of the optic panel assembly of the backlit destination sign board in accordance with the invention showing the arrangement for mounting various components thereof. It includes one set of fully assembled Light Panel (discussed above), an LED driver circuit board 7, a a monocoque sheet metal chassis 8, a rubber grommet 9 and adhesives AD. The LED driver 7 is mounted onto the designated location on the Light Panel using high bonding adhesives AD. The wires from the LED strips 5 are joined to the driver circuit board 7 and the power input cable is brought out of the chassis 8 through a rubber grommet 9. The side having the Light diffuser 1 shall be the front of the board. The final test shall be performed by powering it up before the next procedure is done. Now, the sealing the enclosure is done by edge bonding for finally obtaining destination boards shown in Figures 2 or 2A.
Figure 5 illustrates the complete assembly of backlit destination signboard in accordance with the invention indicating all its components in an exploded view. This complete assembly shows a PC diffuser 1, a PMMA LG panel 2, an acrylic

high quality PC reflector sheet 3 to achieve higher efficiency of total internal reflection. A PVC protective sheet 4, two acrylic media sheets MS, a front enclosure cover 6, a back enclosure cover 7, two pedestal mounting brackets 8, two acrylic media sheet bottom supports 9, a water proof adhesive 10 between front enclosure 6 and diffuser 1. Four layers of adhesives 10,11,12 and 13 are applied between various components to form the destination board assembly including the optic panel assembly shown in Figure 2 in an exploded view. A water proof adhesive 10 is applied between front enclosure 6 and PC diffuser 1 in addition to three layers 11,12 and 13 described above in respect of Figure 2. Four M4x25 pan head screws, four M6xl6 CSK star screws and fourteen % inch pop socket reverts are also provided for assembling the various components of the destination board in accordance with the present invention as shown herein. Two LGP mounting supports 17 and two inside mounting plates 18 are also provided (see also Figure 3D).
Figure 6 illustrates the sealing arrangement of the optic panel assembly of the backlit destination signboard in accordance with the invention showing the arrangement for sealing various components thereof, in order to avoid any ingress of water/dampness which may be harmful for the optic panel assembly. The two pieces of Aluminium channel 14 will be edge bonded on the top and bottom half of the optic panel assembly by a special tool. Once edge bonded with the Aluminium channel 14, the mounting brackets 15 are screwed by means of screws 16 on three sides of the board as shown in Figure 6. The "brackets 15 join the edge bands and also serve as sliding channel for the media sheets 2. The screw on the brackets will also serve in fastening the board to the host surface. LG Panel 2 is made of PMMA, which is a transparent thermoplastic, often used as a lightweight or shatter-resistant

alternative to glass and is an economical alternative to polycarbonate (PC) when extreme strength is not necessary. PMMA does not contain the potentially harmful bisphenol-A subunits found in polycarbonate. It is often preferred because of its moderate properties, easy handling and processing, and low cost. Non-modified PMMA behaves in a brittle manner when loaded, especially under an impact force, and is more prone to scratching than conventional inorganic glass, but modified PMMA can achieve high scratch and impact resistance. It is to be noted that PMMA LG Panel 2 is the primary source of light here, which is powered by a string of LEDs which are embedded inside a groove on either side of the panel.
This panel 2 has a matrix of small dots etched on its planar surface which will act as secondary source of minute light dots when illuminated by the LED strips on either side. The LEDs are powered by efficient drivers which deliver constant current. The drivers can accept 12 to 24V DC supply in a vehicle. The circuits 'are well protected for reverse polarity and surges. The enclosure is rugged and well-sealed from dust and moisture. The unit is water resistant and is compliant with IP-54 requirements. The enclosure is designed to suit various types of

mountings like the Pedestal mounting, wall mounting and roof mounting. Colourful stickers may be used to write the destination details on a transparent sheet that is placed in front of the back-lit source. These transparent boards with different destination details can be swapped as required. This will make the display attractive, intelligible, reliable and low cost option for the destination boards.

Accordingly, it is clear from the above description of figures that the method of assembly for manufacturing the backlit destination signboard in accordance with the invention involves mainly three steps:
1. Preparation of Light Panel
2. Mounting the light panel
3. Sealing the enclosure by edge bonding
The following components should be kept ready before commencement of the sealing of the enclosure:
• Fully Assembled Light Panel with a monocoque sheet metal chassis - 1 set
• The Aluminium Channel 14 for Edge banding - No. of units - 2
• Brackets 15 to hold the printed translucent media - No. of units - 3
• Screws 16 - No. of units - 6
• Adhesive sealant
• Branding Sticker
In the most preferred embodiment, the destination board in accordance with the present invention has the overall dimensions of 684 x 332x33 (mm) with a display area of 610 x 210 (mm).
The power consumption of the destination board assembly is just 10 watts with the help of the use of high bright white LED used therein. The light output is approx.250 lux and the input is a built-in CC driver of 12/24V DC with reverse 'polarity protection. The interface includes a 2-pin connector and the flexible mounting includes the brackets for pedestal mount/ cradle mount/wall mount. IP

rating of the system is IP-54 compliant and automotive compliant. The main components of the system are: Pedestal Mount Backlit Destination Board, Cradle Mount Backlit Destination Board and a Wall Mount Backlit Destination Board, which is very easy to remove and replace media sheet as per requirement. The final Product is very slim and of an aesthetically superior quality.
It is to be mentioned here that although the destination board in the embodiment 'shown herein is a pedestal mounted configuration to be placed or fixed at any desired location, it may also be configured as a cradle mounted to be hanged from the top or also as a panel that may be easily slid between two fixed side channels as a wall mounted assembly or it may be configured in any other possible manner, depending on the availability of space for such destination boards and to facilitate the best view from outside to the public standing at a fair distance away from the bus.
The description provided herein is purely by way of example and illustration. The various features and advantageous details are explained with reference to the non-limiting embodiments in the following description of the present invention. The descriptions of well-known components and processing techniques are consciously omitted so that the embodiments described in this specification are not unnecessarily obscured.
The exemplary embodiments described in this specification are intended merely to provide an understanding of the various manners in which these embodiments may be used and to further enable the skilled person in the relevant art to practice these embodiments.

Accordingly, these illustrative exemplary embodiments should not be construed as limiting the scope of the present invention. It is to be understood that the phraseology or terminology employed in this specification is merely for the purpose of description and not for limiting the scope thereof.
Although the embodiments presented in this disclosure have been described in terms of its preferred embodiments, the skilled person in the art would readily recognize that these embodiments can be applied with modifications possible within the spirit and scope of the present invention as described in this •specification.
Technical Advantages & Economic Significance
• Thin light diffusor/ light spreader with good output efficiency are placed in front of the LG Panel to generate a homogeneous light along the plane of the panel.
• Enclosure is rugged and well-sealed from dust and moisture and thus the unit is water resistant and is compliant with IP-54 requirements.
• Enclosure can be designed to suit various mounting requirements, such as pedestal mounting, wall mounting or roof mounting.
• Display can be made attractive, intelligible, reliable and low cost option for the destination boards by using colourful stickers to write the destination details on a transparent sheet placed in front of the back-lit source.
• Unique circular die cuts on the top side of the media sheet allow easy holding using just 3 fingers to pull out.
• Circuits are well protected for reverse polarity and surges.
• Slim just 25mm,

• Three dimples seen on the two media sheet guide channels hold the media sheet in place firmly which is unique.
• Easier interchange of transparent boards with different destination details as required.
• The LEDs are powered by efficient automotive compliant drivers which deliver constant current.
• These LED drivers can accept 12 to 24V DC supply in the vehicle.
• The circuits are well protected from the dangers of reverse polarity connections and surges.
• The electronics does not have any controller based programs and hence no algorithms.
• It is the use of Edge banding technique using Aluminium channels to achieve a sealed enclosure assembly.
• Unique Monocoque sheet metal chassis slim, rugged and elegant looking.
Other uses of the present invention:
While considerable emphasis has been placed on the specific features of the preferred embodiment described here, it will be appreciated that many additional •features can be added and that many changes can be made in the preferred embodiments without departing from the principles of the invention. These and other changes in the preferred embodiment of the invention will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We claim:
1. Low-power backlit signboard for motor vehicles, said signboard comprising:
(a) optic panel assembly consists of-
- a light diffuser panel (1) and a light reflector sheet (3), both provided with at least one slot each on their longer sides;
- at least one LED strip (5);
- a light guide panel (2) having a matrix of dots etched on its planar surface;
- a protective sheet (4),
wherein said panels (1, 2) and sheet (3) are bonded together by means of

suitable adhesives in a predefined arrangement; and
(b) mounting arrangement consisting of a plurality of top and/or bottom mounting brackets (14) and/or side mounting brackets (15) screwed to the optic panel assembly by means of fastening means (16);
(c) sealing arrangement consisting of a plurality of sealing channels (14) bonded and/or bent to define the profile of the optic panel assembly; and
wherein said optic panel assembly includes a chassis assembly to be mounted on one side thereof, and including a monocoque sheet metal chassis (8) assembled with a LED driver circuit board (7) using high bonding adhesives (AD), a rubber grommet (9) for passage of wire/s (9A) of the LED strip/s (5) therethrough.

2. Low-power backlit signboard as claimed in claim 1, wherein said diffiiser is a polycarbonate (PC) diffiiser panel; said reflector sheet is a polycarbonate (PC) reflector sheet; said light guide panel is a poly(methyl methacrylate) (PMMA) light guide panel and said protective sheet is a polyvinyl chloride (PVC) protective sheet.
3. Low-power backlit signboard as claimed in claim 1, wherein said light guide panel (2) comprises longitudinal slot/s and said diffiiser panel (1) and reflector sheet (3) have grooves corresponding to said LED strip/s for accommodating said LED strip/s.
4. Low-power backlit signboard as claimed in claim 1, wherein said side
mounting brackets comprise mounting-cum-sliding channels for inserting
►
acrylic media display sheet/s (MS) containing a plurality of projections/ depressions (DP) centrally located near one of the edges thereof.
5. Low-power backlit signboard as claimed in claim 1, wherein said mounting arrangement comprises a plurality of mounting supports (17) for optic panel assembly and a plurality of inside mounting plates (18) for supporting said optic panel assembly.
6. Low-power backlit signboard as claimed in claim 1, wherein said driver circuit board has an input with a built-in CC driver with reverse polarity protection, said CC driver accepting 12 to 24V DC supply to deliver constant current.

7. Low-power backlit signboard as claimed in claim 1, wherein said Low-power backlit signboard is water resistant and compliant with IP-54 requirements and its light output in the range of 200-300 lux.
8. Low-power backlit signboard as claimed in claim 1, wherein said low-power backlit signboard is configured for a plurality of mountings, a pedestal mounting or a wall mounting or a roof mounting.
9. Low-power backlit signboard as claimed in claim 1, wherein said low-power backlit signboard acrylic media display sheet/s (MS) includes colorful transparent sheet stickers having the destination and/or pictorial representation thereof on a transparent sheet placed in front of the diffuser panel (1).
10. Method of assembly for manufacturing the backlit destination signboard as claimed in claims 1 to 9, said method comprises the step of:
(a)Preparing the optic panel assembly as claimed in claims, 1 to 10; which includes the steps of:
• preparing a matrix of small dots etched on the planar surface of said PMMA LG panel (2) acting as secondary source of minute light dots when illuminated by said LED strips (5) on either side,
• sandwiching said panel (2) between said light diffuser sheet (1) on one side and said reflector sheet (3) on the other side,

• placing said thin light diffuser (1) with good output efficiency in front of said light panel (2) to generate a homogeneous light along the plane of said light panel,
• bonding said protective sheet (4) over said reflector sheet (3),
• cutting a slot cut on both the longer side of said rectangular panel (2) to accommodate said LED strip/s (5) on at least one side,
• creating a groove on the walls of said diffuser sheet (1) and said reflector sheets (3),
• placing said LED strip/s (5) inside said grove, and holding at a predetermined place, and
• guiding said wires (9A) from said LED strip/s (5) going along said grove towards said CC driver (7).
(b) Mounting said optic panel assembly on said chassis (8), which includes the steps of:
• Mounting the LED driver circuit board onto the designated location on said chassis using high bonding adhesives (6); and
• Joining the wires from the LED strips (5) to said driver circuit board and bringing said power input cable out of said chassis through said rubber grommet (9); and

(c) Sealing said optic panel assembly mounted on said chassis by edge bonding process, which includes the steps of:
• edge bonding two-piece aluminum channel (10) on to the top and bottom half by using a special tool,
• screwing the mounting brackets (11,12)on 3 sides of the board, and
• joining the edge bands for brackets (11) to also serve as sliding channel for the media sheets (MS).