Claims:We Claim:

1. An illumination device for illuminating and displaying a logo, the device comprising:
a logo display panel for displaying the illuminated logo;
at least one light source configured on a side portion of the device and below the logo display panel;
a first diffuser sheet arranged in front of the light source, the light source emits light through the diffuser sheet such that secondary colours are emitted therefrom;
a light guiding plate configured on a rear side of the logo display panel, the light guide plate having reflectors attached or separate component, to reflect the secondary colours towards the logo display panel; and
a second diffuser sheet arranged in between the logo display panel and the light guide plate, the second diffuser sheet allows distribution of the secondary colours homogenously along the logo display panel and eliminate the visibility of Pattern or Texture of the Light guide plate through the illuminated logo.

2. The device as claimed in claim 1, wherein multiple light source are configured on a side of the light guide plate or logo display panel.

3. The device as claimed in claim 1, wherein a transparent sheet is configured in between the light source and the first diffuser sheet.
4. The system as claimed in claim 3, wherein the transparent sheet can be an acrylic sheet with reflective coating, wherein the reflective coating is coated except in the direction of propagation of light for minimizing power loss.

5. The system as claimed in claim 1, wherein reflective coating is coated in the light guide plate or a separate component pasted rear side of the light guide plate.

6. The system as claimed in claim 1, wherein a reflector is provided on a rear side of the light guide plate.

7. The system as claimed in claim 1, wherein a spacer is provided below the logo display panel, the spacer fills the empty place between the logo display panel and the second diffuser sheet.

8. The system as claimed in claim 1, wherein a user of the first terminal can selectively send the location information request of the predefined contacts.
, Description:Field of the invention

[0001] The present invention relates a logo illumination system. More specifically, the present invention describes about an illumination device for illuminating and displaying a logo in multicolor.

RGB- Red Green Blue
LGP- Light Guiding Plate
LED- Light Emitting Diode

Background of the invention

[0002] The logo illumination in a display device is done by using primary colours such as RGB colours emitted from an LED unit. This limits the device condition monitoring through multicolour logo illumination. The logo illumination from top position is not appreciated because it spreads light in radial direction and also hot spot is prominent at the source position. For proper diffusion of top illuminated LED light, the thickness of diffuser kept in between the light source and display should be increased and that increases the overall thickness of the display device. But still the hotspot cannot be completely eliminated. Further, the intensity of light from the LED decreases from the light source making the homogenous illumination of logo impossible.

[0003] Also, effective generation of secondary colour with the combination of primary colour decreases when the light is dispersed radially from centre of the source. Usually, the LEDs are arranged on a top portion which may increase the thickness of the device and this also reduces the safety of the device.

[0004] Hence, there is a need to provide a display device which provide a proper homogenous diffusion of light which overcomes few or all of the drawbacks of the illumination device.

Object of the invention

[0005] An object of the present invention is to provide an illumination device for illuminating and displaying a logo.

[0006] Another object of the present invention is to provide an illumination device for illuminating and displaying a logo, which avoid spreading of light in radial direction.

[0007] One more object of the present invention is to provide an illumination device for illuminating and displaying a logo, which eliminate the formation of hotspot at the source position.

[0008] Further object of the present invention is to provide an illumination device for illuminating and displaying a logo, which is having reduced thickness.

[0009] Furthermore object of the present invention is to provide an illumination device for illuminating and displaying a logo, which generate a secondary colour from combination of primary colours.

[0010] Further one more object of the present invention is to provide an illumination device for illuminating and displaying a logo, which illuminate logo uniformly or homogenously throughout the logo display panel.

[0011] One more object of the present invention is to provide an illumination device for illuminating and displaying a logo, which is easy to operate and maintain.

Summary of the invention

[0012] According to the present invention, an illumination device for illuminating and displaying a logo from at least one light source is provided. The system is provided with a first diffuser sheet, a light guide plate, a second diffuser sheet and a logo display panel for displaying the illuminated logo. In the present embodiment, the light source is an LED. The LED is configured on a side portion of the system and below the logo display panel. The first diffuser sheet is arranged in front of the LED. The LED emits light through the first diffuser sheet such that secondary colours are emitted therefrom.

[0013] The light guide plate is configured on a rear side of the logo display panel. The light guide plate is having reflectors such as laser engraved micro prisms or micro dots matrix which is attached or separate, to reflect the secondary colours towards the logo display panel. The second diffuser sheet is arranged in between the logo display panel and the light guide plate. Further, the second diffuser sheet eliminate the visibility of the surface texture or patterns of the light guide plate and allows distribution of the secondary colours uniformly along the logo display panel.

[0014] In one embodiment of the present invention, a transparent sheet is configured in between the LED and the first diffuser sheet. The transparent sheet may be an acrylic sheet with reflective coating. The reflective coating is coated except in the direction of propagation of light for minimization of power loss. The light guide plate may also be coated with reflective coating or the reflective coating may be a separate component pasted rear side of the light guide plate. Further, a reflector is provided on a rear side of the light guide plate for more dispersion of light throughout the logo display panel.

[0015] In the present embodiment, the thickness of the illumination device is less and the size of the illumination device is larger than the logo display panel. Further, a spacer is provided to fill the gap between the logo display panel and the light guide plate.

Brief Description of the Drawings

[0016] The advantages and features of the present invention will become better understood with reference to the following detailed description and claims taken in conjunction with the accompanying drawings, wherein like elements are identified with like symbols, and in which:

[0017] Figure 1 illustrates an illumination device for illuminating and displaying a logo in accordance with the present invention;

[0018] Figure 2 illustrates an exploded view of an illumination device for illuminating and displaying a logo ;

[0019] Figure 3 illustrates an assembled view of an illumination device for illuminating and displaying a logo in accordance with the present invention; and

[0020] Figure 4 illustrates the arrangement of LED light source and formation of secondary colours in accordance with the present invention; and

[0021] Figure 5 illustrates an embodiment of an illumination device for illuminating and displaying a logo in accordance with the present invention.

Detail Description of the Invention

[0022] An embodiment of this invention, illustrating its features, will now be described in detail. The words "comprising," having, "containing," and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing such item or items, or meant to be limited to only the listed item or items.

[0023] The terms “first,” “second,” and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, and the terms “an” and “a” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.

[0024] The present invention is to provide an illumination device for illuminating and displaying a logo. The device reduces spreading of light in radial direction and eliminate the formation of hotspot at the source position. Further, there is reduced thickness for the device. Furthermore, the device generate a secondary colour from combination of primary colours. The device also, illuminate logo uniformly or homogenously throughout the logo display panel. The present invention is easy to operate and maintain.

[0025] The disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms.

[0026] Referring now to figures 1, 2 and 3, various view of an illumination device 100 in accordance with the present invention is illustrated. The illumination device, herein after referred as device 100 is for illuminating and displaying a logo from at least one light source configured within. It may be obvious to a person skilled in an art to configure multiple light source on the side of the light guide plate 30 or logo display panel 50. In the present embodiment, the light source is an LED light source, hereinafter referred as LED 10. Further, the device 100 is provided with a first diffuser sheet 20, a light guide plate 30, a second diffuser sheet 40 and a logo display panel 50 for displaying the illuminated logo.

[0027] In the present embodiment, the LED 10 is arranged on a side portion of the device 100 and configured below the logo display panel 50. This arrangement of the LED 10 reduces the thickness of the device 100. The LED 10 emits primary colours such as red, green and blue. It may be obvious to a person skilled in the art to configure the LED 10 in any other side which may be on a back side to the logo display panel 50.

[0028] In this embodiment, the first diffuser sheet 20 is arranged in front of the LED 10 such that the emitted light from the LED 10 may pass through the first diffuser sheet 20. The diffuser sheet is arranged in a plane varied by a predefined distance from the LED 10, thereby eliminating the hotspot creation by the LED 10 light. The first diffuser sheet 20 allows efficient mixing of primary colours to produce secondary colours as shown in figure 4. The first diffuser sheet 20 disperse the primary colours to secondary colours and emits light uniformly across the logo display panel 50. Further, the first diffuser sheet 20 allows the light to emit in uniform intensity for better visibility of logo in the display panel. In this embodiment, the first diffuser sheet 20 is a thicker sheet which allows the primary colours to pass through. The first diffuser sheet may also be place or pasted or created on an acrylic sheet for maximum diffusion of primary colours to form homogeneous secondary colour.

[0029] In another embodiment, as shown in figure 4 and 5, a transparent sheet 22 is configured in between the LED 10 and the first diffuser sheet 20. The transparent sheet 22 may be an acrylic sheet with reflective coating. The reflective coating on the transparent sheet 22 is coated except in the direction of propagation of light, so that the reflected light from the first diffuser sheet 20 may reflect back to the first diffuser sheet 20 for minimizing the loss of light during dispersion. The reflecting coating is provided on the transparent sheet 22 for minimization of power loss thereby maximizing the output from the LED 10 light. In this embodiment, the first diffuser sheet 20 is of minimum thickness and the transparent sheet 22 is of thicker size comparative to the first diffuser sheet 20.

[0030] In the present embodiment, the light guiding plate is configured on a rear side of the logo display panel 50. Each sides of the light guide plate 30 is coated with a reflective coating 54 to reflect the maximum possible light toward the logo display panel 50 or the reflective coating may be a separate component pasted rear side of the light guide plate. Also, the light guide plate 30 is provided with reflectors such as laser engraved micro prisms or micro dots matrix, which is attached or separate to reflect the produced secondary colours towards the logo display panel 50. The second diffuser sheet 40 is arranged between the light guide plate 30 and the logo display panel 50. The second diffuser sheet 40 eliminate the visibility of the surface texture or patterns of the light guide plate and allows distribution of the secondary colours uniformly along the logo display panel 50. In the present embodiment, the logo is placed above the second diffuser plate so that the logo can be illuminated in the logo display panel 50.

[0031] Further in the present embodiment, a back reflector 32 is arranged on a rear side of the light guide plate 30 to reflect the maximum light towards the logo display panel 50. The back reflector 32 prevents the dispersion of light away from the light guide plate 30 and reflect the dispersed light towards the logo display panel 50 thereby increasing light efficiency.

[0032] Further referring to figure 3, a spacer 52 is arranged between the logo display panel 50 and the second diffuser sheet 40. The spacer 52 fills the gap between the logo display panel 50 and the second diffuser sheet 40.In the present embodiment the thickness of the illumination device is lesser than the logo illumination panel.

[0033] The advantages of the present invention is to provide an illumination device for illuminating and displaying a logo. The device avoid spreading of light in radial direction and eliminates the formation of hotspot at the source position. Further, the device is of reduced thickness making it user friendly. The device also illuminates logo uniformly or homogenously throughout the logo display panel. The present system is easy to operate and maintain.

[0034] The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the present invention.