A kind of annular light guide plateTechnical field
The present invention relates to display technology field, more particularly to a kind of annular light guide plate.
Background technology
Light guide plate is the part commonly used in electronic product, the generally transparent PC of light guide plate (makrolon) or acrylic materialMaterial, its light for acting as sending LED are transmitted on Surface Appearance, play the work of instruction product working condition and aesthetic appealWith.LED is usually square structure, and patch is welded on pcb board.Because LED size is relatively small, light range of exposures that it sendsIt is limited, generally arranged by several LED combination and provide light source for a light guide plate, and then annular or strip light band are formed, such asThis causes a problem, and due to the spot light using interruption, different zones bright-dark degree differs in light bar so that product appearance is bigGive a discount.Particularly, when the annular that is shaped as of light guide plate, when LED is assemblied on circle ring inner wall, due to the surface of circle ring inner wallLess than the surface area of annulus outer wall, the phenomenon that bright-dark degree differs on annulus outer wall exiting surface can be particularly acute product.
Such issues that to solve, way more common at present are addition astigmatism powder, the light for sending LED in light guide plateLine dissipates to all directions, to form uniform light guide effect, still, the damage of light has been inevitably resulted in using astigmatism powderConsumption, emitting brightness is reduced, and then need more powerful light source, cause the waste of resource.
The content of the invention
In view of above-mentioned, the present invention designs a kind of annular light guide plate, solves light guide plate uniform in light emission from structural pointThe problem of degree differs.
Technical scheme is as follows：A kind of annular light guide plate, including on upper and lower surface and annulus internal and external circumferentialInner and outer wall, the inwall form the incidence surface of the annular light guide plate, and the outer wall forms going out for the annular light guide plateSmooth surface；The inwall is provided with least one LED, on the annular light guide plate, offers at least one manhole, the circleShape through hole is arranged on the conduct direction of the LED light extractions, and causes the light that at least part LED is sent to pass through the manholeRefraction is formed afterwards.
Preferably, the LED quantity is multiple that the quantity of the manhole is corresponding with the LED, and described circular logicalThe quantity in hole can realize the light all standing exiting surface by annular light guide plate.
Preferably, the center of circle of the manhole and corresponding LED center and the center of circle position of the annular light guide plateIn on same straight line.
Preferably, the manhole equidistantly distributed.
Preferably, filling light transmission medium in the manhole, the material of the light transmission medium and the annular light guide plateThe material of body is different.
Preferably, the refractive index of the light transmission medium material of filling is less than the annular light guide plate sheet in the manholeThe refractive index of body material.
Preferably, the LED is mounted on the inwall, or the LED is embedded in the inwall.
Preferably, the inner and outer wall is that irreflexive mat surface structure can be achieved.
Preferably, the upper and lower surface of the annular light guide plate is provided with reflectance coating.
Preferably, the reflectance coating is also covered in the upper and lower surface of the manhole.
The present invention in LED exit directions by setting manhole so that the light that LED is sent is led into annularAfter tabula rasa, by the refraction of these manholes, the angle of emergence of light is expanded so that light is emitted from all directions, and thenSo that the light of annular light guide plate outer wall outgoing is more uniform；Meanwhile light is in light guide plate when transmitting, due in the absence of itIts absorbing medium, the loss of light is greatly reduced, improves luminous efficiency.So as to reach energy-conserving and environment-protective, luminous uniform luminance it is high,The purpose of light guide plate resource is rationally utilized, there is very high market application value.
Brief description of the drawings
Fig. 1 is the first implementation schematic diagram of annular light guide plate of the present invention.
Fig. 2 is the vertical view face schematic diagram of annular light guide plate in first embodiment of the invention, wherein annular light guide plateUpper and lower surface is provided with reflectance coating；
Fig. 3 is the second embodiment schematic diagram of annular light guide plate of the present invention；
Fig. 4 is the 3rd embodiment schematic diagram of annular light guide plate of the present invention；
Fig. 5 is the fourth embodiment schematic diagram of annular light guide plate of the present invention.
Embodiment
In order that relevant technical staff in the field more fully understands technical scheme, below in conjunction with of the invention realThe accompanying drawing of mode is applied, the technical scheme in embodiment of the present invention is clearly and completely described, it is clear that described realityApply mode only a part of embodiment of the present invention, rather than whole embodiments.
It should be noted that when element is expressed as " being fixed on " another element, it can be directly in another elementAbove or therebetween there may be one or more elements placed in the middle.When an element is expressed as " connecting " another element, itAnother element can be directly to or there may be one or more elements placed in the middle therebetween.Institute in this specificationTerm " vertically ", " parallel ", "left", "right" and the similar statement used is for illustrative purposes only.
With reference to figure 1 and Fig. 2, the annular light guide plate 100 of the first embodiment of the present invention：Including upper surface 101, lower surface102 and inwall 103 and outer wall 104 in annulus internal and external circumferential, what the inwall 103 formed the annular light guide plate 100 enters lightFace, outer wall 104 form the exiting surface of the annular light guide plate 100.1 LED105, the annular are embedded with the inwallOn light guide plate 100,1 manhole 106 is offered, the manhole 106 is arranged on the conduct side of the LED105 light extractionsUpwards, and the light that at least part LED105 is sent is caused to form refraction after the manhole 106.
Reflectance coating is all covered with the upper surface 101 and lower surface 102 of the annular light guide plate 100, meanwhile, the reflectance coatingAlso the upper surface 102 and lower surface 103 of the manhole 106 are covered in.In the present embodiment, the reflectance coating is metallic reflectionFilm, it is preferable that the material of the metallic reflective coating is metal and coated by electric plating method that the reflectance coating is simultaneously coated in circleThe upper surface 102 and lower surface 103 of through hole 106.The inwall 103 and outer wall 104 of the circular light guide plate are irreflexive to can be achievedMat surface structure.The bulk material of annular light guide plate 100 is transparent PC or acrylic, and manhole 106 is in airport or holeOther light transmission mediums, the refractive index of the light transmission medium material are less than the annular light conducting plate body material in addition to air for fillingRefractive index.
In this embodiment, it is logical that 1 LED105 and 1 corresponding circle is provided only with the annular light guide plate 100Hole 106, the light that LED105 is sent is after the refraction of corresponding manhole 106, from the outer of annular light guide plate 100Wall 104 is emitted.
It should be noted that the position of manhole 106 and size can be by needing light to cover the specific model of exiting surfaceDepending on enclosing；The program does not limit LED105 assembly method, LED105 can be mounted on the inwall 103 orIt is embedded in the inwall 103；In addition, LED105 quantity can be adjusted according to the thickness of annular light guide plate 100, i.e.,It can be stacked along the thickness direction of annular light guide plate 100 and assemble several LED105.
With reference to the schematic diagram that figure 3 is second embodiment, the annular light guide plate 110 and first of the second embodiment of the present inventionThe difference of the annular light guide plate 100 of embodiment is：The center of circle of manhole 116 and corresponding LED115 center and shouldThe center of circle of annular light guide plate 110 is located on the same line.In the embodiment, the position of manhole 116, radius size are equalDepending on can be according to the scope that emergent light needs cover.
With reference to the schematic diagram that figure 4 is 3rd embodiment, the annular light guide plate 120 and second of the third embodiment of the present inventionThe difference of the annular light guide plate 110 of embodiment is：It is complete that 6 radius sizes are provided with the annular light guide plate 120Identical manhole 126, the manhole 126 are equidistantly arranged in using the center of circle of annular light guide plate 120 as the center of circleOn circular arc, the radius of the circular arc ensures that manhole 126 can be fully located on annular light guide plate 120.With 6 manholes6 LED125 are respectively assembled on the inwall 123 of the annular light guide plate 120 corresponding to 126.Preferably, the manhole 126The center of circle be located on the same line with corresponding LED125 center and the center of circle of the annular light guide plate 120.This implementationIn example, the quantity of manhole 116, position, radius can be adjusted correspondingly according to the demand of actual light extraction.The implementationIn mode, LED125 glow color is not intended to limit, can select to need according to the actual requirements in specific implementation process in inwall 123The upper LED125 for assembling different glow colors.
The annular light guide plate 130 of the fourth embodiment of the present invention and the annular light guide plate 120 of 3rd embodiment are notIt is with part：The spacing of manhole 136 is no longer identical in the annular light guide plate 130, but according to realityThe strong and weak situation of emitting brightness is adjusted.With reference to figure 5, if actual demand is light by annular light guide plate 130All standing exiting surface, while, it is necessary to meet that brightness is with respect to another part corresponding to the part light extraction region of annular light guide plate 130Emitting brightness is weaker corresponding to region.Now, go out the relatively strong subregion of luminous intensity in demand, be uniformly distributed 5 radiusesSize is identical, interval is identical and the center of circle is located at manhole 136 on same circular arc；Another part require emitting brightness compared withWeak region, 3 manholes 136 as described above can be uniformly distributed.The radius of the circular arc should be ensured that all circlesThrough hole 136 is respectively positioned on annular light guide plate 130, embedding with 136 corresponding LED135 of manhole on the inwall 133, it is preferred thatIt is straight that the center of circle of the manhole 136 with corresponding LED135 center and the center of circle of the annular light guide plate 130 is located at sameOn line.
In this embodiment, according to the actual requirements the strong and weak distributed areas of emitting brightness, can rationally set circular logicalRadius size, position and the mutual spacing in hole, to reach the effect of actual demand.It should be appreciated that this implementationExample should also include actual demand emitting brightness repeatedly strong and weak situation about changing.
Only express the several embodiments of the present invention above, its describe it is more specific and in detail, but can not therefore andIt is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, do not taking offOn the premise of present inventive concept, various modifications and improvements can be made, these belong to protection scope of the present invention.CauseThis, the protection domain of patent of the present invention should be determined by the appended claims.