Abstract: A light color adjustment structure for illuminated keyboards to resolve the shortcomings of conventional illuminated keyboards that generate mono light and unalterable includes a light source module located in an illuminated keyboard and a brightness control module located in the illuminated keyboard and electrically connected to the light source module. The light source module has at least a first light source and a second light source of different light colors that are mixed to generate a light color for the illuminated keyboard. The brightness control module generates a brightness control signal sent to the light source module to control the brightness of the light source module. Thus through brightness alterations and mixing of the first and second light sources varying light colors can be generated.

Abstract: A keypad is provided for a computing device. The keypad includes one or more lighting devices or mechanisms for illuminating a plurality of keys structures. In an embodiment, the plurality of key structures are formed from a milky material.

Abstract: An uniformly self-luminous keyboard device comprises a housing and a keyboard unit. The housing includes an upper casing and a lower casing, which can be assembled together. After the upper casing and the lower casing are assembled together, an accommodation space is formed therebetween. The upper casing has an opening interconnecting the accommodation space. The keyboard unit is arranged in the accommodation space and includes a plurality of press members passing through the opening and moved by a force to have a displacement, and a baseplate supporting the press members. A light conduction space is formed between the baseplate and the lower casing. A light emitting unit is arranged inside the light conduction space. The height of the light conduction space decreases with the distance to the light emitting unit, whereby light is uniformly distributed over the bottom of the keyboard unit. Thus is achieved the uniformly self-luminous keyboard device.

Abstract: A liquid crystal display device having a direct backlight which uses a high-bright light source achieves both of a high efficiency and thin uniformity. In a liquid crystal display device which includes a liquid crystal panel, and a backlight unit which is arranged on a side of the liquid crystal panel opposite to a display screen of the liquid crystal panel, the backlight unit includes a housing, a plurality of light sources arranged in the inside of the housing, and a diffusion plate which is arranged between the plurality of light sources and the liquid crystal panel, the diffusion plate includes a plurality of light blocking regions at positions corresponding to the plurality of respective light sources, and the light blocking region at a center portion of the housing and the light blocking region at an edge portion of the housing exhibits transmissivities different from each other.

Abstract: A structure for attaching a fluorescent tube includes a base, a holder supported by the base, and a pair of contacts. The holder holds an intermediate portion of the fluorescent tube while restraining the fluorescent tube from moving in a radial direction. To the pair of contacts, terminals of a pair of end portions of the fluorescent tube are respectively attachable in an attaching direction corresponding to the radial direction of the fluorescent tube. Each contact includes a pair of elastic pieces facing each other. The pair of elastic pieces have a pair of straight portions extending substantially straight along the attaching direction and facing each other. On the pair of straight portions, a pair of contact portions for clamping the corresponding terminal of the fluorescent tube therebetween are formed.

Abstract: A device for the illumination of a display, in particular of a transmission display of a motor vehicle, comprises an areal lighting means for an at least substantially uniform illumination of the total display in combination with at least one light emitting diode for an illumination of a respective individual display, in particular of a transmission position display offset in comparison with the uniform illustration of the total display, in particular a more intensive illustration of a respective individual display, in particular of a transmission position display.

Abstract: The present invention relates to an instrument for measuring blood pressure. More particularly, the present invention relates to a display module of LED light pillar of hemomanometer. Which comprises a shell (1) containing a LED printed circuit board (2) that has a multiple of pins (21) at one side and corresponding multiple of LED tubes (22) at the other side; a cover plate (3) provided with a multiple of through holes (31); a driving circuit board (4) provided at the external side of cover plate (3); each pin (21) of the LED printed circuit board (2) passes each through hole (31) of the cover plate (3) correspondingly and links to driving circuit board (4) and the cover plate (3) and shell (1) jointly encapsulate the LED printed circuit board (2); a top of the shell (1) is transparent in on which a linear grating (5) is provided. The object of the present invention is to encapsulate LED printed circuit board in its shell without requiring epoxy resin.

Abstract: Illumination assemblies and systems using same are disclosed. The illumination assembly can include a reflective substrate, and a light source unit including one or more light sources capable of producing illumination light. The assembly can further include a first light extraction surface including an azimuthal beam widening topography, where the first light extraction surface is positioned such that the light source unit is between the first light extraction surface and the reflective substrate. The first light extraction surface can face the light source unit.

Abstract: An illuminated pointer assembly for a gauge scale having an outer periphery includes a pointer that moves about a periphery of the gauge scale and is illuminated by a light guide. The light guide is disposed on a plane below the pointer and the gauge scale. The light guide includes at least two LEDs that are disposed adjacent first and second ends of the light guide. The light guide also includes a plurality of reflective elements. The plurality of reflective elements is disposed in sets that are orientated with regard to each of the LEDs. The reflective elements provide for the transmission and direction of light within the light guide into the guide body portion of the pointer.

Abstract: The present invention relates to a control panel assembly in which a light emitted from a single lamp is prevented from being dispersed nearby. A control panel assembly for a laundry machine, the control panel assembly includes a lamp supporter in which a plurality of lamps are installed to display functions selected by a user; a deco formed corresponding to the plurality of the lamps, the deco including a plurality of light-emitting holes through which a light emitted from each of the lamps passes; a light window including a light dispersion preventing part provided between the lamp supporter and the deco to prevent the light emitted from each of the lamps from being emitted through the other light-emitting holes except a single light-emitting hole corresponding each of the lamps.

Abstract: An indicator for a vehicle instrument cluster is provided. The indicator includes a dial configured to guide light from a light source to a pointer which further guides the light so that it is visible by a user.

Abstract: A pointer assembly includes the pointer and hub that are both illuminatable. The hub includes a main portion with a concave surface. A reflector is partially received within a slot through the concave surface and is supported on top of the hub. The reflector includes a reflective surface that directs light onto the concave surface. Light from a light source is directed by separate reflective surfaces on the pointer and the reflector to illuminate both the hub and the pointer.

Abstract: An operation panel includes: a casing having a front surface; first and second operation elements disposed on the front surface of the casing; a light source for emitting light to each of the first and second operation elements and disposed in the casing; and a brightness adjustment layer for covering at least a part of a light emitting surface of the light source. The first operation element includes a first light transmission part, and the second operation element includes a second light transmission part. The light from the light source transmits the first and second light transmission parts so that the light is output from the casing. The brightness adjustment layer adjusts brightness of the light emitted from the light source and outputting toward one of the first and second light transmission parts.

Abstract: A surface light source device which illuminates a transmission-type liquid crystal display unit from the back surface includes P×Q surface light source units with individually controlled light sources. Each of the light sources includes a plurality of light-emitting element units. Each of the light-emitting element units includes at least one red light-emitting element that emits red light, at least one green light-emitting element that emits green light, and at least one blue light-emitting element that emits blue light. The center of mass of a luminance profile based on each of a plurality of red light-emitting elements, a plurality of green light-emitting elements, and a plurality of blue light-emitting elements in each surface light source unit substantially coincides with the center of mass of the surface light source unit.

Abstract: A backlight assembly for a liquid crystal display device is disclosed with high efficiency and high brightness. The backlight assembly includes a light source in which a first light emitting diode and a second light emitting diode are combined, a board where the light source is mounted, and optical sheets arranged in front of the light source. By alternately arranging a front emitting type LED and a side emitting type LED in various structures, high efficiency and high brightness may be obtained using a small number of light emitting diodes.

Abstract: An example light guide assembly for illuminating a display of an instrument cluster includes a light receiving portion, a light propagating portion and a reflective surface between the light receiving portion and the light propagating portion. The light receiving portion extends along a first axis, and the light propagating portion extends along a second axis which is transverse to the first axis. The reflective surface includes a stepped surface transverse to the reflective surface.

Abstract: In a backlight assembly and a display device having the same, the backlight assembly includes a receiving container, a light source, a reflecting member and an optical member. The receiving container includes a bottom plate and a sidewall protruded from a side of the bottom plate. The light source is received in the receiving container. The light source generates light. The reflecting member is interposed between the bottom plate and the light source. The reflecting member has a protruded portion protruded upward to support the light source. The optical member is on the light source to improve optical characteristics of the light generated from the light source.

Abstract: A luminous keyboard includes a cap which has a bottom lid with a first light directing zone formed thereon. The cap also has a first light blocking surface on an outer surface corresponding to the first light directing zone. At least one luminous unit is provided to provide light to the first light directing zone so that the light projects to the first light directing zone is diffused and blocked by the first light blocking surface, and finally projected to a keyboard portion to illuminate keycaps. The bottom lid replaces the light directing layer used in the conventional luminous keyboards. Thus the interior space of the keyboard can be shrunk to make fabrication and assembly of the keyboard simpler. The keyboard thus formed is thinner and lighter and suitable for mass production.

Abstract: The pointer illuminator includes: an optically transparent pointer member having a reflecting surface for a pointer, which surface reflects, light incident on a predetermined surface of incidence and guides the light to a tip of the pointer; a light source arranged around a drive shaft of the pointer member; and an optically transparent light-guiding member, which guides light from the light source to the surface of incidence and includes a first light-guiding reflecting surface provided on a face of the light-guiding member, an angle which the face forms with a center axis of the light source becoming smaller as the face leaves the light source so that the first light-guiding reflecting surface reflects the light from the light source to convert the light into approximately parallel light rays, whereby the light-guiding member guides the parallel light rays to the surface of incidence.

Abstract: A lighting apparatus is provided. The lighting apparatus includes a power supply housing section, a circuit board housing section, a light source housing section, a cutout portion, and a light source. An image recorded on a record medium is displayed in the state that an end portion of the power supply housing section and an end portion of the record medium secured to the cutout portion are placed on a surface where the lighting apparatus is placed.

Abstract: A switch includes a substrate including a main body and a cylindrical portion protruding upright from the main body and defining a transverse groove in the outer surface thereof, a light emitter fixed on the cylindrical portion to receive light beams from the light emitter and produce three electrical outputs respectively, and a dial member including a cylindrical dial and two arms protruding upright from the cylindrical dial and forming two engagement portions on the inner surfaces thereof respectively. The engagement portions are engaged in the groove so that the cylindrical dial is rotatable to a number of orientations in which the produced electrical outputs are coded into a number of different switch signals by selectively blocking the radiated light beams using the two arms.

Abstract: A light housing for an instrument panel includes an interior surface for reflecting and blending light from a plurality of light sources substantially uniformly from an opening. The light housing is mounted to a circuit board and surrounds a plurality of light sources. An interior surface of the light housing includes inwardly protruding ribs that reflect and direct light to blend the separate light sources and provide a substantially uniform light intensity for illuminating a rotating pointer.

Abstract: A keyboard equipped with a backlight structure includes a keyboard portion, a bridge board and a base board located beneath the keyboard portion to form a light transmission space. The bridge board has a light channeling portion to channel light entering the light transmission space to the keyboard portion where light emission is desired to refract the light. The structure can be made at a lower cost and converge light to display the keyboard portion without illuminating the entire keyboard portion.

Abstract: A backlight module (20) includes a light guide plate (23), a reflecting member (21) and a plurality of light source (22). The light guide plate has a light incidence surface (231) and a light-emitting surface (232) opposite to the light incidence surface. The reflecting member faces the light incidence surface of the light guide plate. The light sources are arranged between the reflecting member and the light guide plate. The light guide plate defines a plurality of hollow structures (25) therein corresponding to the light sources and has a plurality of microstructure units (27) defined on the light incidence surface corresponding to the light sources.

Abstract: A display device includes an ultraviolet light source, a color light source, and a filter selectively hit by their lights. The filter has a first area part for displaying the first display contents excluding an overlapped parts when the ultraviolet light is emitted, a second area part for the second display contents excluding the overlapped parts when the color light is emitted, and a third display part for displaying the overlapped parts when one of the ultraviolet and color light is emitted. The first area part blocks the color light and produces visible light when the ultraviolet light hits the first area part, the second area part allows the ultraviolet and color lights to pass therethrough, and the third area part allows the ultraviolet and color lights to pass therethrough and produces the visible light when the ultraviolet light hits the third area part.

Abstract: An example light guide assembly for illuminating a display of an instrument cluster includes a light receiving portion, a light propagating portion and a conical surface positioned between the light receiving portion and the light propagating portion. An exterior surface of the light propagating portion includes a plurality of lobes that uniformly illuminate the display as light propagates from the light receiving portion to the conical surface and through the light propagating portion.

Abstract: A key module with a multi-layer light guiding structure includes a plurality of keys, light guiding structure and a plurality of light blocks corresponding to the light guiding structure. The light guiding structure includes a plurality of light guiding plates. Each of the light guiding plate includes at least one light guiding strip corresponding to specific keys, which are staggered to each other or corresponding to each other. The light guiding strip is provided with a color layer. An electronic device using the key module individually or selectively lights light emitting elements for each layer of the light guiding plates. Therefore, different lights are emitted from the light guiding strips or a mixed light is produced from the light guiding strips to illuminate the keys. The keys have lights of different color to manifest symbols or alphabets on the keys.

Abstract: An ultra thin lighting element including at least one light source. A lightguide element includes one lightguide layer comprising a plurality of discrete fine optic surface relief structures on at least one portion of at least one surface. Each surface relief structure includes basic structural features on the order of about 10 microns or less in height, and on the order of about 10 microns or less in each lateral dimension. The number, arrangement and size of each surface relief structure and height and lateral dimensions of the structural features of the surface relief structures being varied to provide a desired degree of outcoupling modulation of light incoupled into the light guide element.

Abstract: A keyboard includes a printed circuit board, a light guide sheet, a keypad member and a light shield. The printed circuit board has a plurality of light-emitting devices. The light guide sheet is disposed over the printed circuit board to receive the light output from the light-emitting devices. The keypad member has a plurality of keys, wherein the light guide sheet is disposed between the printed circuit board and the keypad member. The light shield is disposed between the light guide sheet and the keypad member. The light shield has a light-absorbing surface, a light-reflective surface and a plurality of light-outlet holes. The light-reflective surface faces the light guide sheet. The light-absorbing surface faces the keypad member. The light output from the light-emitting devices passes the light-outlet holes to illuminate the keypad member.

Abstract: An instrument cluster assembly includes a dial face having a pointer assembly for indicating a specific measured perimeter. The pointer assembly includes an inner portion and an outer portion that are selectively and independently illuminated.

Abstract: A transmittance adjuster unit includes multiple transmittance adjusters arranged in a predetermined pattern, if the pattern density is ?(x, y), the maximum luminance Fmax of the light emitted from the light emission plane of a planar illumination device when the unit is not provided is 1, the minimum luminance is Fmin, and the relative luminance with respect to the maximum luminance Fmax of the light emitted from a predetermined position (x, y) of the emission plane is F(x, y), the relationship between the luminance F(x, y) and the pattern density ?(x, y) satisfies the following expression: ?(x, y)=c{F(x, y)?Fmin}/(Fmax?Fmin), wherein 0.5?c?1. This unit is thin and lightweight, and can reduce unevenness of the luminance without reducing the average luminance of the incident light. The planar illumination device includes the transmittance adjuster unit and a liquid crystal display device includes the planar illumination device.

Abstract: A display device includes a translucent member having a scale part, a light source disposed at a rear side of the translucent member and a dial plate. The dial plate has a shield part that is located to shield a first portion of the scale part from a visual side so as to be invisible from the visual side when the light source is off. The scale part has a second portion that is a residual portion of the first portion, and the second portion is visible from the visual side when the light source is off. The shield part has a translucency so that the first portion of the scale part is visible through the shield part when the light source is on.

Abstract: An exemplary optical plate (23) includes a transparent plate portion 231, a plurality of brightness enhancement structures (232) and a light diffusion layer (233). The transparent plate portion has a light input interface (2311), and a light output surface (2312) opposite to the light input interface. The brightness enhancement structures are formed at the light output surface. The light diffusion layer are formed on the light input interface, which includes a transparent resin matrix material and a plurality of first light diffusion particles and a plurality of second light diffusion particles dispersed in the transparent resin matrix material uniformly. A refractive index of the second light diffusion particles is greater than that of the first light diffusion particles. An exemplary method for manufacturing the optical plate is also provided. The optical plate and an associated backlight module (20) can increase the light energy utilization ratio.

Abstract: In one configuration, a gauge of an instrument cluster may have a base structure with an integrally molded dial structure and a separate, attached dial structure. A transparent area of the base structure may pass light from one side of the base structure to another side. This provides the ability to supply backlighting and floodlighting to the gage structure with just a single LED. The separate dial structure may be translucent to provide floodlighting or to supply light to graduations. Relative to a gauge pointer, inboard indicia in one dial structure denote vehicle speeds, while outboard graduations in another dial structure demark the indicia. The transparent portion of the base structure may be an integrally molded horizontal, angular or vertical portion within the base structure. Multiple levels and angles of the gauge provide a viewed component that is aesthetically pleasing and soothing to a viewer's eyes.

Abstract: A disclosed vehicle instrument panel includes a control panel having illuminated buttons formed with an illuminatable decorative surface. The disclosed decorative surface includes a translucent layer disposed between a background layer and a graphic layer. Material is removed from the background layer to reveal the underlying translucent and graphic layers. The depth within which material is removed is determined to fall within a thickness of the translucent layer such that any variation in depth is accommodated within the translucent layer.

Abstract: An exemplary backlight module (300) includes a light source (320), a frame (310) and diffusing plate (340). The frame includes an inner bottom surface (314) and an inner side surface (312) adjacent to the bottom surface. The side surface includes a light reflecting and converging structure. The diffusing plate cooperates with the frame to define a space that accommodates the light source. The side surfaces having the v-shape structures can reflect and converge light beams toward the middle portion of the diffusing plate, thus preventing these light beams from otherwise obliquely entering peripheries of the diffusing plate and subsequently being lost. Therefore, the backlight module has an increased light utilization ratio.

Abstract: A vehicle display having an LCD display that is employed to communicate a first type of vehicle information and a second set of vehicle information in which the information that is to be communicated can include or consist of symbols. A display light guide is employed to distribute light from two light sources to selectively illuminate portions of the display screen of the LCD display. The LCD display can be employed to generate telltale warning indicators. The LCD display provides flexibility in the display of information so that a relatively large quantity of telltale warning indicators can be handled without specifically dedicating a light source, a light tunnel and space on the vehicle display for each telltale warning indicator that may be employed in a vehicle.

Abstract: A backlight assembly having an improved heat releasing structure and a display device having the backlight assembly are provided. The backlight assembly includes a plurality of lamps emitting light and a fixing member receiving the plurality of lamps. A separating member protruding from an edge of the fixing member defines an inner space that contains the light-lamp portions in the fixing member, and the separating member separates electrodes of the lamps from the inner space. The separating member has openings that are positioned to direct the heat generated by the lamp electrodes away from the inner space where the excess heat can cause display quality deterioration.

Abstract: A light guide has a series of light channels passing through the guide between an outer planar surface and a base. Two resilient arms extend from opposite ends of the guide. The arms have free ends with cap elements for fitting over bosses within an instrument cluster mask. The base of the guide, through a flex action of the resilient arms, forces a dial or appliqué against the mask for viewing through a display window in the mask. In a vehicle instrument cluster assembly, the light guide is located between the mask and a printed circuit board (PCB). The PCB has light emitting diodes for fitting into the channels at the planar surface of the guide and backlighting the appliqué. The PCB presses against the cap elements of the resilient arms, causing the base of the guide to force the appliqué against sides of the mask window.

Abstract: This invention relates to a light guide (1) for a control knob, particularly an instrument panel of a vehicle. The knob is fitted with an index (3) free to move in rotation about an axis (A). The light guide (1) will be inserted between a light source (2) and the index (3) and comprises at least one entry surface (4) for light rays emitted by the light source (2), a first exit surface (6) of light rays towards the index (3) and side faces (5) inserted between the entry surface (4) and the first exit surface (6). The light guide comprises first optical means (4, 8, 15, 16) to orient received light rays approximately parallel to the rotation axis (A) of the index (3), and second optical means (5, 22, 14, 17, 18, 19, 20) to focus the previously reoriented light rays towards at least the first exit surface (6).

Abstract: A vehicle-mounted display apparatus (1) includes an indicator dial panel (2) and a scale gauge unit (20), which protrudes from the obverse surface (2a) of the indicator dial panel (2), and which is translucent. A pair of protrusion parts including a first protrusion part (23a) and a second protrusion part (23b) are installed upon an exterior surface (21) of the scale gauge unit (20). The pair of protrusion parts (23a and 23b) comprise incline surfaces (24a, 24b, 25a, and 25b), respectively, and these incline surfaces are inclined with regard to the indicator dial panel (2), respectively.

Abstract: The present invention concerns a micromotor for an indicator device comprising a hand of the type generally used in the instrument panels of motor vehicles. More specifically, the present invention concerns a micromotor of this type comprising a case wherein the thickness of one area is smaller than its maximum thickness, so as to form a free space or recess open on the exterior, in particular on the bottom of the case. This recess can be advantageously used for arranging components necessary for the operation of the instrument panel in which the micromotor is mounted, thereby saving space with respect to devices of the prior art.

Abstract: A backlight module includes: a transparent panel having a grooved surface and a planar surface opposite to the grooved surface, the transparent panel being formed with a plurality of elongate grooves that are indented from the grooved surface and that are aligned in a first lateral direction, each of the elongate grooves extending in a second lateral direction transverse to the first lateral direction, and having an open end; a board attached to the grooved surface of the transparent panel to cover the open ends of the elongate grooves; a reflecting material provided on one of the planar surface of the transparent panel and the board; and a plurality of light emitting sources disposed respectively in the elongate grooves for radiating light.

Abstract: LEDs (7) are arranged on at least opposite two corners of a bottom surface of a box body (11) of a tray shape whose bottom surface is quadrilateral, whose upper side is open, on an inner surface of which a light reflection member (11b) is provided, and whose side walls (11c) are inclined outward, so as to irradiate inside of the box body, wherein a plurality of LEDs (71) are arranged so that a region irradiated by each of the LEDs (71) rotates sequentially in a specific direction (same direction). As a result, there can be obtained a surface light source having high brightness and uniformity in an arbitrary size whether the light source is small or large while using semiconductor light emitting devices (LEDs), and an electrically illuminated signboard using the surface light source, which is thin and capable of uniform display and which operates with low electricity consumption.

Abstract: A backlighting system and a method for utilizing instrument cluster backlighting for a dynamic styling are disclosed, wherein the backlighting system comprises a plurality of light sources separated into a plurality of light zones, adjacent light zones having walls disposed therebetween, wherein the walls militate against the light emitted in each zone from radiating into an adjacent zone. A controller is in electrical communication with the light source to produce the dynamic styling of the light zones, thereby providing the operator with a situational warning in response to a vehicle condition.

Abstract: A direct-illumination backlight apparatus using LEDs includes a flat reflective plate, an LED light source, a transparent plate, a scattering pattern, and a light guide. The light guide serves to introduce a partial light from an LED light source at such an angle that the partial light is trapped inside the transparent plate, and the scattering pattern serves to scatter the trapped light beam at a position directly above the LED light source so that the scattered light beam escapes out of the transparent plate toward an LCD panel.

Abstract: A dial gauge assembly includes a first pointer driven by a first motor and a second pointer that is driven by a second motor that rotates independently about a common axis. A first pointer rotates about an axis of rotation to indicate on the outer scale and a second pointer rotates about the same axis of rotation to indicate on the inner scale. The first pointer is mounted directly to a shaft of the first motor and the second pointer is mounted directly to a second shaft of the second motor.

Abstract: An illumination sensing device for a portable terminal is disclosed. The illumination sensing device includes a housing having a sensor hole extending through a side of the housing, a printed circuit board in the housing and connected to a backlight unit, an illumination sensor coupled with the printed circuit board and disposed in the sensor hole, and an optical guide disposed in the sensor hole and facing the illumination sensor. The illumination sensor senses light introduced through the optical guide from outside the housing, and the backlight unit is operated based on the light sensed by the illumination sensor.

Abstract: Illumination unit UT is used for the illumination of an LCD panel 1 from the rear side of the LCD panel 1. Illumination unit UT includes light source 2, rear cover 6 to cover light source 2 and resin frame 7 assembled with rear cover 6. Resin frame 7 is provided with stopper 73 and rib 74 disposed to restrict the movement of stopper 73 perpendicularly to rib 74. Rear cover 6 has first and second apertures 64 and 65 provided correspondingly to receive stopper 73 and rib 74, respectively. Resin frame 7 and rear cover 6 are assembled with each other by the engagement of stopper 73 and rib 74 with first and second apertures 64 and 65, respectively.

Abstract: A backlighting device (300, 400, 500, 600) emitting light having a first wavelength includes a first radiation emission device (302), e.g., an electroluminescent lamp, for emitting radiation having a second wavelength. A layer (306) of a plurality of photon emitting particles (308), e.g., free standing quantum dots or phosphorus particles, emits light having the first wavelength in response to the first radiation emission device (302), the first wavelength being larger than the second wavelength. A transparent material (116, 120, 122) overlies the layer of a plurality of photon emitting particles (308), wherein the light having a first wavelength passes through the transparent material (116, 120, 122). Optionally, a filter (402) may be placed over the layer (306) to block the radiation having a second wavelength, and a scattering layer (604) may be placed over the layer (306) to scatter wavelength other than the first wavelength.