IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0675853
(2008-09-02)
|
등록번호 |
US-8322874
(2012-12-04)
|
국제출원번호 |
PCT/US2008/075018
(2008-09-02)
|
§371/§102 date |
20100301
(20100301)
|
국제공개번호 |
WO2009/032813
(2009-03-12)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- 3M Innovative Properties Company
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
49 |
초록
▼
Lightguides, devices incorporating lightguides, and processes for making lightguides are described. A lightguide includes light extractors arranged in a pattern on a surface of the lightguide. The pattern of light extractors is arranged to enhance uniformity of light output across a surface of the l
Lightguides, devices incorporating lightguides, and processes for making lightguides are described. A lightguide includes light extractors arranged in a pattern on a surface of the lightguide. The pattern of light extractors is arranged to enhance uniformity of light output across a surface of the lightguide and to provide enhanced defect hiding. The efficiency of the light extractors is controlled by a shape factor. The areal density of the light extractors across the surface of the lightguide may be substantially constant or may decrease along the direction of propagation of light from the light source.
대표청구항
▼
1. A lightguide, comprising light extractors arranged in a pattern on a surface of the lightguide, the pattern configured to enhance uniformity of light output across a surface of the lightguide wherein an areal density of the light extractors is substantially constant or varies inversely with extra
1. A lightguide, comprising light extractors arranged in a pattern on a surface of the lightguide, the pattern configured to enhance uniformity of light output across a surface of the lightguide wherein an areal density of the light extractors is substantially constant or varies inversely with extraction efficiency of the light extractors and wherein the pattern is configured to reduce observable defects of the lightguide. 2. A backlight, comprising: a light source configured to generate light; anda lightguide, comprising light extractors arranged in a pattern on a surface of the lightguide, the pattern configured to enhance uniformity of light output across a surface of the lightguide, wherein an areal density of the light extractors is substantially constant or decreases as a function of illumination from the light source;wherein the pattern is configured to reduce observable defects of the lightguide. 3. A backlight, comprising: a light source configured to generate light;a lightguide, comprising light extractors arranged in a pattern on a surface of the lightguide, the pattern configured to enhance uniformity of light output across a surface of the lightguide, wherein an areal density of the light extractors is substantially constant or decreases as a function of illumination from the light source;a first area of the lightguide having relatively higher illumination from the light source; anda second area of the lightguide having relatively lower illumination from the light source, the light extractors in the first area having substantially equal or greater areal density than the light extractors in the second area;wherein the light source comprises a first lamp and a second lamp, light propagating from the first lamp and light propagating from the second lamp combining in the first area and not combining in the second area. 4. A backlight, comprising: a light source configured to generate light;a lightguide, comprising light extractors arranged in a pattern on a surface of the lightguide, the pattern configured to enhance uniformity of light output across a surface of the lightguide, wherein an areal density of the light extractors is substantially constant or decreases as a function of illumination from the light source;a first area of the lightguide having relatively higher illumination from the light source; anda second area of the lightguide having relatively lower illumination from the light source, the light extractors in the first area having substantially equal or greater areal density than the light extractors in the second area;wherein each of the light extractors has substantially equal footprint areas on the lightguide surface and the number of light extractors in the first area is greater than the number of light extractors in the second area. 5. A backlight, comprising: a light source configured to generate light;a lightguide, comprising light extractors arranged in a pattern on a surface of the lightguide, the pattern configured to enhance uniformity of light output across a surface of the lightguide, wherein an areal density of the light extractors is substantially constant or decreases as a function of illumination from the light source;a first area of the lightguide having relatively higher illumination from the light source; anda second area of the lightguide having relatively lower illumination from the light source, the light extractors in the first area having substantially equal or greater areal density than the light extractors in the second area; wherein the number of light extractors in the first area is substantially equal to the number of light extractors in the second area and the footprint area on the lightguide surface of each of the light extractors in the first area is greater than the footprint area of the light extractors in the second area. 6. A device, comprising: keys;a switch matrix arranged in relation to the keys and configured to complete an electrical circuit when one or more of the keys are activated;a light source; anda lightguide arranged in relation to the light source, the lightguide comprising: a first region of the lightguide configured to illuminate a first key located relatively nearer a light source;a second region of the lightguide configured to illuminate a second key located relatively farther from the light source; andlight extractors arranged in a pattern on a surface of the lightguide, the light extractors configured to enhance uniformity in light output of the lightguide in the first and second regions, wherein the light extractors have greater areal density in the first region than the second region. 7. The device of claim 6, wherein at least one characteristic of the light extractors varies within and/or between the regions to enhance uniform light output within the regions. 8. The device of claim 7, wherein the at least one characteristic comprises a density of the light extractors. 9. The device of claim 7, wherein the at least one characteristic comprises a footprint size of the light extractors. 10. The device of claim 7, wherein the at least one characteristic comprises a shape of the light extractors. 11. The device of claim 6, wherein: the lightguide comprises: a first corner;a second corner; andan edge extending between the first and second corners; andthe light source comprises: one or more lamps arranged between the first and second corners at an angle with respect to the edge. 12. The device of claim 6, wherein the device comprises a portable electronic device. 13. The device of claim 6, wherein the device comprises a cellular telephone. 14. A process, comprising: forming a lightguide master, comprising: providing a photoreactive composition, said photoreactive composition comprising: (1) at least one reactive species that is capable of undergoing an acid- or radical-initiated chemical reaction, and(2) at least one multiphoton photoinitiator system;imagewise exposing at least a portion of said composition to light sufficient to cause simultaneous absorption of at least two photons, thereby inducing at least one acid- or radical-initiated chemical reaction where said composition is exposed to the light, said imagewise exposing being carried out in a pattern that is effective to define at least the surface of a pattern of light extraction structures, each light extraction structure having at least one shape factor, and the pattern of light extraction structures having a distribution that is uniform or non-uniform; andforming a lightguide from the master, at least one first region of the lightguide configured to be located relatively nearer a light source, at least one second region of the lightguide configured to be located relatively farther from the light source, and the light extractors arranged on a surface of the lightguide, the light extractors configured to enhance uniformity in light output of the lightguide in the first and second regions, wherein the light extractors have greater areal density and lesser extraction efficiency in the first region than the second region.
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