Industrial Case Study By ~  Girishbabu D Uppin PGPDE ~ 05203 “ Non Uniform Distribution of Light  through light guide/pipe”
Location of the light guide in present case Top cover LCD LCD Backlighting (Light guide) LED Rear AC Control panel
<ul><li>The above control display shown is prototype just to represent what to be displayed </li></ul>Rear AC Control in T...
Problem ~ <ul><li>Non Uniform Distribution of light in Rear AC Control Display through light guide/pipe. </li></ul><ul><li...
Function of the light guide <ul><li>To provide a path for a light to travel in different directions and distribute uniform...
<ul><li>Through Blue color LED only. </li></ul><ul><li>Dimensions 20mm x 30mm (area of display LCD), within the height of ...
Constrains to solve the problem   <ul><li>Position of LED at the centre or right side, below the LCD. </li></ul>
<ul><li>Principle: </li></ul><ul><li>Coupling of light from the source (here LED) into light guide/pipe. </li></ul><ul><li...
Study of existing light guides/pipes:   Light distribution
Present designs of light guide for one LED with secondary operation painting background  Present designs of light guide fo...
Light Distribution through various present light guides   With two LEDs with varying thickness and with painting Painting
Light Distribution through various present light guides   With two LEDs with concave profile &  painting With two LEDs wit...
Light Distribution through various present light guides   With one LED with Flat profile and painting With one LED with Ta...
Light Distribution through various present light guides   With one LED with Tapering profile and painting
Light Distribution through various present light guides   With one LED with segregations With one LED with segregations an...
Light Distribution through various present light guides   With one LED with segregations and painting at circumference Wit...
<ul><li>Vital Points derived : </li></ul><ul><li>Use microstructure array with very small dimensions </li></ul><ul><li>Tap...
ARRAYS  Taper surface  Angle for refraction  Explanation  New Design:
Distribution of light (satisfactory compare to previous designs) 2 LEDs
 
New Design   with improvement Angle for refraction  Conical to reflect back the outgoing light  New shape tilt angle is op...
Thank You uppingiri@yahoo.com, uppingiri@gmail.com
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Case Study Presentation by G D Uppin

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  1. 1. Industrial Case Study By ~ Girishbabu D Uppin PGPDE ~ 05203 “ Non Uniform Distribution of Light through light guide/pipe”
  2. 2. Location of the light guide in present case Top cover LCD LCD Backlighting (Light guide) LED Rear AC Control panel
  3. 3. <ul><li>The above control display shown is prototype just to represent what to be displayed </li></ul>Rear AC Control in TATA Indigo XL
  4. 4. Problem ~ <ul><li>Non Uniform Distribution of light in Rear AC Control Display through light guide/pipe. </li></ul><ul><li>Dark Area at centre and sides. </li></ul>With one LED With two LED
  5. 5. Function of the light guide <ul><li>To provide a path for a light to travel in different directions and distribute uniformly </li></ul><ul><li>Aim was to design such light guide to provide uniform distribution </li></ul>
  6. 6. <ul><li>Through Blue color LED only. </li></ul><ul><li>Dimensions 20mm x 30mm (area of display LCD), within the height of 9mm. </li></ul><ul><li>Minimum numbers of LEDs (Max 2). </li></ul><ul><li>Should be less cost . </li></ul><ul><li>No secondary operations </li></ul>Constrains to solve the problem (DESIGN) Space between circuit board and LCD (9mm)
  7. 7. Constrains to solve the problem <ul><li>Position of LED at the centre or right side, below the LCD. </li></ul>
  8. 8. <ul><li>Principle: </li></ul><ul><li>Coupling of light from the source (here LED) into light guide/pipe. </li></ul><ul><li>Coupled light travels in the light pipe through the process of internal reflection </li></ul><ul><li>Points for uniform distributions </li></ul><ul><li>Providing microstructure array to have internal refraction. </li></ul><ul><li>Provide very small pitch between arrays for good results. </li></ul><ul><li>Paint can be used as reflector </li></ul><ul><li>Taper surface is better than straight </li></ul><ul><li>Aspheric is much better than taper </li></ul>
  9. 9. Study of existing light guides/pipes: Light distribution
  10. 10. Present designs of light guide for one LED with secondary operation painting background Present designs of light guide for two LED with secondary operation painting back ground Present designs of light guide for one LED without painting but introducing segregations below
  11. 11. Light Distribution through various present light guides With two LEDs with varying thickness and with painting Painting
  12. 12. Light Distribution through various present light guides With two LEDs with concave profile & painting With two LEDs with Flat profile and painting
  13. 13. Light Distribution through various present light guides With one LED with Flat profile and painting With one LED with Tapering profile and painting
  14. 14. Light Distribution through various present light guides With one LED with Tapering profile and painting
  15. 15. Light Distribution through various present light guides With one LED with segregations With one LED with segregations and painting at the edge Painting
  16. 16. Light Distribution through various present light guides With one LED with segregations and painting at circumference With one LED with segregations With one LED with segregations
  17. 17. <ul><li>Vital Points derived : </li></ul><ul><li>Use microstructure array with very small dimensions </li></ul><ul><li>Taper at bottom is better than straight. (Even aspheric is better than taper or combination) </li></ul><ul><li>Provide angle at entry of light </li></ul>
  18. 18. ARRAYS Taper surface Angle for refraction Explanation New Design:
  19. 19. Distribution of light (satisfactory compare to previous designs) 2 LEDs
  20. 21. New Design with improvement Angle for refraction Conical to reflect back the outgoing light New shape tilt angle is optimized to produce the most uniform illumination distribution Arrays This design has to be tested
  21. 22. Thank You uppingiri@yahoo.com, uppingiri@gmail.com

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