1. A light guide panel comprising:
a first layer comprising
an incident surface on which light emitted from a light source is incident,
an opposing surface opposite to the incident surface, and
a top surface through which light exits;
a second layer disposed on the top surface of the first layer and comprising a periodic array of exit units, each exit unit comprising a concave portion and a convex prism; and
a third layer comprising an anisotropic material disposed on the second layer,
wherein light having a first polarization that is transmitted through the concave portion, is totally reflected by the convex prism and is transmitted upward through the third layer, while light having a second polarization is totally reflected at a top surface of the third layer.
2. The light guide panel of claim 1, wherein the second layer further comprises planar portions disposed between adjacent exit units.
3. The light guide panel of claim 1, wherein the concave portion comprises a curved surface and a planar surface.
4. The light guide panel of claim 3, wherein the curved surface has a circular-arc-shaped cross-section.
5. The light guide panel of claim 1, wherein the concave portion comprises at least two planar surfaces.
6. The light guide panel of claim 2, wherein the planar portion is tapered away from the light source.
7. The light guide panel of claim 1, wherein the concave portion and the prism repeat, forming a continuous array.
8. The light guide panel of claim 1, wherein the concave portion allows light passing therethrough to be incident on the convex prism at an angle greater than a critical angle for the convex prism.
9. The light guide panel of claim 1, wherein the first layer and the second layer comprise a single, integral body.
10. A light guide panel comprising:
a first layer comprising
an incident surface on which light emitted from a light source is incident,
a surface opposing the incident surface, and
a top surface through which light exits;
a second layer disposed on the top surface of the first layer and comprising a periodic array of exit units, each exit unit having a first concave portion, a convex prism, and a second concave portion continuously connected to the prism; and
a third layer comprising an anisotropic material disposed on the second layer, wherein
light having a first polarization that is transmitted through the first concave portion, is totally reflected by the convex prism and is transmitted upwardly through the third layer,
light having the first polarization that is transmitted through the second concave portion, is totally reflected by an inside surface of the second concave portion and is transmitted upwardly through the third layer, and
light having a second polarization is totally reflected at a top surface of the third layer.
11. The light guide panel of claim 10, wherein the first and second concave portions have triangular cross-sections.
12. The light guide panel of claim 11, wherein a central angle of the first concave portion is greater than a central angle of the second concave portion.
13. The light guide panel of claim 11, wherein a plane is formed by the meeting of the prism and the second concave portion and is at a right angle to the first layer.
14. The light guide panel of claim 10, wherein the second concave portion comprises planar and curved surfaces.
15. The light guide panel of claim 14, wherein the prism and the second concave portion form a plane in a connecting area.
16. The light guide panel of claim 15, wherein the plane is at a right angle to the first layer.
17. The light guide panel of claim 10, wherein the second layer further comprises planar portions disposed between adjacent exit units.
18. A backlight unit irradiating a display with light, the backlight unit comprising:
a light source;
a light guide panel which guides light incident from the light source; and
a prism sheet disposed above the light guide panel;
wherein the light guide panel comprises:
a first layer comprising an incident surface on which light emitted from a light source is incident, a surface opposite to the incident surface, and a top surface through which light exits;
a second layer disposed on the top surface of the first layer and comprising a periodic array of exit units, each exit unit comprising a concave portion and a convex prism; and
a third layer comprising an anisotropic material disposed on the second layer,
wherein light having a first polarization that is transmitted through the concave portion, is totally reflected by the convex prism and is transmitted upward through the third layer, while light having a second polarization is totally reflected at a top surface of the third layer.
19. The backlight unit of claim 18, wherein the second layer further comprises planar portions disposed between adjacent exit units.
20. The backlight unit of claim 18, wherein the concave portion comprises a curved surface and a planar surface.
21. The backlight unit of claim 20, wherein the curved surface has a circular-arc-shaped cross-section.
22. The backlight unit of claim 18, wherein the concave portion comprises at least two planar surfaces.
23. The backlight unit of claim 19, wherein the planar portion is tapered away from the light source.
24. The backlight unit of claim 18, wherein the concave portion and the prism repeat, forming a continuous array.
25. The backlight unit of claim 18, wherein the concave portion allows light passing therethrough to be incident on the convex prism at an angle greater than a critical angle for the convex prism.
26. A backlight unit irradiating a display with light, the backlight unit comprising:
a light source;
a light guide panel which guides light incident from the light source; and
a prism sheet disposed above the light guide panel;
wherein the light guide panel comprises:
a first layer comprising an incident surface on which light emitted from a light source is incident, a surface opposite to the incident surface, and a top surface through which light exits;
a second layer disposed on the top surface of the first layer and comprising a periodic array of exit units, each exit unit having a first concave portion, a convex prism and a second concave portion continuously connected to the prism; and
a third layer comprising an anisotropic material disposed on the second layer, wherein
light having a first polarization that is transmitted through the first concave portion is totally reflected by the convex prism and is transmitted upwardly through the third layer,
light having the first polarization that is transmitted through the second concave portion is totally reflected by an inside surface of the second concave portion and is transmitted upwardly through the third layer, and
light having a second polarization is totally reflected at a top surface of the third layer.
27. The backlight unit of claim 26, wherein the first and second concave portions have triangular cross-sections.
28. The backlight unit of claim 27, wherein a central angle of the first concave portion is greater than a central angle of the second concave portion.
29. The backlight unit of claim 27, wherein a plane is formed by the meeting of the prism and the second concave portion and is at a right angle to the first layer.
30. The backlight unit of claim 26, wherein the second concave portion comprises planar and curved surfaces.
31. The backlight unit of claim 30, wherein the prism and the second concave portion form a plane in a connecting are, the plane forming a right angle with respect to the first layer.
32. The backlight unit of claim 26, wherein the light guide panel further comprises a polarization converting plate, disposed on a bottom surface of the first layer, which converts the polarization direction of incident light.
33. A display comprising:
the backlight unit of claim 18; and
a display panel which produces an image using light emitted from the backlight unit.
34. A display comprising:
the backlight unit of claim 26; and
a display panel which produces an image using light emitted from the backlight unit.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of creating an internal channel of a fluid-ejection device, the method comprising:
encapsulating at least a portion of a channel core that corresponds to the internal channel in a molten material of an element of the fluid-ejection device;
solidifying the molten material so that the at least the portion of the channel core is contained within the element; and
using a solvent to dissolve the at least the portion of the channel core from the element after solidifying the molten material;
wherein encapsulating the channel core in the element of the fluid-ejection device comprises:
forming the channel core in a groove of a component of the element of the fluid-ejection device; and
disposing the molten material of the element of the fluid-ejection device on the component so as to cover the channel core.
2. The method of claim 1, wherein the channel core is a water-soluble channel core.
3. The method of claim 1, wherein the channel core is a composite channel core.
4. The method of claim 3, wherein the composite channel core comprises a soluble material and insoluble particles dispersed within the soluble material.
5. A method of creating an internal channel of a fluid-ejection device, the method comprising:
forming a channel core that corresponds to the internal channel from a soluble material;
disposing the channel core within a mold cavity;
injecting a molten material of an element of the fluid-ejection device into the mold cavity so as to encapsulate at least a portion of the channel core;
after the molten material of the element of the fluid-ejection device solidifies within the mold cavity, removing the element of the fluid-ejection device from the mold while the at least the portion of the channel core is encapsulated by the solidified material of the element of the fluid-ejection device; and
dissolving the at least the portion of the channel core that is encapsulated by the solidified material of the element of the fluid-ejection device after removing the element of the fluid-ejection device with the at least the portion of the channel core encapsulated thereby from the mold.
6. The method of claim 5, wherein forming a channel core from a soluble material comprises molding the channel core.
7. The method of claim 5, wherein forming a channel core from a soluble material comprises molding a channel core having external threads.