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US 7,023,418 B2Granted
Display device, electronic paper and electronic paper file
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTetsuro Nakamura, Masichiro Tatekawa
Life of this patent
Estimating the term…
Abstract
The invention comprises a display sheet, a light guide sheet and a light source provided to at least one side of the light guide sheet. And an electronic paper of the invention has a configuration for color display that the display sheet is made up by laminating respective display sheets for red, green and blue colors.
Claims10
A display device comprising:
- a display sheet;
- a light guide sheet, a surface of which is in direct contact with a surface of the display sheet;
- and
- a light source placed on at least one side of the light guide sheet, wherein
- the light guide sheet is provided with a specific number of grooves to have a specific shape and a specific depth on a surface opposite to the surface of the light guide sheet joined to the display sheet in parallel with the light source at a specific pitch,
- the pitch of the grooves is corresponding to a pixel of the display sheet, and
- the thickness of the light guide sheet is from not less than 0.1 mm to not more than 2 mm, the depth of the groove is from not less than one fifth to not more than one third of the light guide sheet's thickness, and a tip angle of the groove is from not less than 60 degrees to not more than 100 degrees.
4 more elements
A display device comprising:
- a display sheet;
- a light guide sheet, a surface of which is in direct contact with a surface of the display sheet;
- and
- a light source placed on at least one side of the light guide sheet, wherein
- the light guide sheet is provided with a specific number of grooves to have a specific shape and a specific depth on a surface opposite to the surface of the light guide sheet joined to the display sheet in parallel with the light source at a specific pitch,
- the pitch of the grooves gets smaller gradually as the groove keeps away from the light source, and
- the thickness of the light guide sheet is from not less than 0.1 mm to not more than 2 mm, the depth of the groove is from not less than one fifth to not more than one third of the light guide sheet's thickness, and a tip angle of the groove is from not less than 60 degrees to not more than 100 degrees.
4 more elements
A display device comprising:
- a display sheet;
- a light guide sheet, a surface of which is in direct contact with a surface of the display sheet;
- and
- a light source placed on at least one side of the light guide sheet, wherein the light guide sheet is provided with a specific number of grooves to have a specific shape and a specific depth on a surface opposite to the surface of the light guide sheet joined to the display sheet in parallel with the light source at a specific pitch,
- the pitch of the grooves gets smaller gradually as the groove keeps away from the light source, and
- the pitch of the grooves is proportioned to the a-th power of the distance from the light source (a is a constant from −0.5 to −3).
3 more elements
A display device comprising:
- a display sheet;
- a light guide sheet, a surface of which is in direct contact with a surface of the display sheet;
- and
- a light source placed on at least one side of the light guide sheet, wherein
- the light guide sheet is provided with a specific number of grooves to have a specific shape and a specific depth on a surface opposite to the surface of the light guide sheet joined to the display sheet in parallel with the light source at a specific pitch,
- the depth of the groove gets larger gradually as the groove keeps away from the light source, and
- the thickness of the light guide sheet is from not less than 0.1 mm to not more than 2 mm, the depth of the groove is from not less than one fifth to not more than one third of the light guide sheet's thickness, and a tip angle of the groove is from not less than 60 degrees to not more than 100 degrees.
4 more elements
A display device comprising:
- a display sheet;
- a light guide sheet, a surface of which is in direct contact with a surface of the display sheet;
- and
- a light source placed on at least one side of the light guide sheet, wherein
- the light guide sheet is provided with a specific number of grooves to have a specific shape and a specific depth on a surface opposite to the surface of the light guide sheet joined to the display sheet in parallel with the light source at a specific pitch,
- the depth of the groove gets larger gradually as the groove keeps away from the light source, and
- the depth of the groove is proportioned to the b-th power of the distance from the light source (b is a constant from 0.5 to 3).
4 more elements
An electronic paper comprising:
- a display sheet using a nonvolatile and reflective liquid crystal;
- a light guide sheet, a surface of which is in direct contact with a surface of the display sheet;
- and
- a light source placed on at least one side of the light guide sheet, wherein
- the light guide sheet is provided with a specific number of grooves to have a specific shape and a specific depth on a surface opposite to the surface of the light guide sheet joined to the display sheet in parallel with the light source at a specific pitch,
- the pitch of the grooves is corresponding to a pixel of the display sheet, and
- the thickness of the light guide sheet is from not less than 0.1 mm to not more than 2 mm, the depth of the groove is from not less than one fifth to not more than one third of the light guide sheet's thickness, and a tip angle of the groove is from not less than 60 degrees to not more than 100 degrees.
4 more elements
An electronic paper comprising:
- a display sheet using a nonvolatile and reflective liquid crystal;
- a light guide sheet, a surface of which is in direct contact with a surface of the display sheet;
- and
- a light source placed on at least one side of the light guide sheet, wherein
- the light guide sheet is provided with a specific number of grooves to have a specific shape and a specific depth on a surface opposite to the surface of the light guide sheet joined to the display sheet in parallel with the light source at a specific pitch, and
- the pitch of the grooves is proportioned to the a-th power of the distance from the light source (a:
- a constant from −0.5 to <3).
4 more elements
An electronic paper comprising:
- a display sheet using a nonvolatile and reflective liquid crystal;
- a light guide sheet, a surface of which is in direct contact with a surface of the display sheet;
- and
- a light source placed on at least one side of the light guide sheet, wherein
- the light guide sheet is provided with a specific number of grooves to have a specific shape and a specific depth on a surface opposite to the surface of the light guide sheet joined to the display sheet in parallel with the light source at a specific pitch, and
- the depth of the groove is proportioned to the b-th power of the distance from the light source (b:
- a constant from 0.5 to 3).
4 more elements
Dependencies are inferred from the claim text.