1. A method of displaying an image in a display screen by displaying a gradation level for each pixel, the method comprising the steps of:
forming a subfield group that includes a plurality of subfields each weighted with a brightness weight in a field;
forming an emission pattern information, which is a combination of binary values, that indicates an emitted state by a value of \u201c1\u201d or a non-emitted state by a value of \u201c0\u201d corresponding to every subfield in the subfield group,
forming each of gradation levels to be displayed using predetermined plural pieces of emission pattern information;
making an average value of each of the gradation levels to be displayed using the predetermined pieces of emission pattern information be equal to one of the gradation levels to be displayed; and
making an average emission rate for every subfield to be defined by averaging the binary values corresponding to each, of the same subfield; and
wherein the predetermined pieces of emission pattern information are preliminarily set for each of the gradation levels to be displayed so that the average emission rate of any subfield with a brightness weight smaller than a maximum brightness weight is equal to or greater than 0.75 among the subfields where the average emission rate is not zero.
2. A method of displaying an image as claimed in claim 1, wherein a given level of gradation is displayed by timewise changing each of the plurality of pieces of emission pattern information, for one pixel.
3. A method of displaying an image as claimed in claim 2, wherein a given level of gradation is displayed by spatially arranging each of the plurality of pieces of emission pattern information, for a plurality of adjacent pixels.
4. A method of displaying an image as claimed in claim 1, wherein a given level of gradation is displayed by spatially arranging each of the plurality of pieces of emission pattern information, for a plurality of adjacent pixels.
5. A method of displaying an image as claimed in claim 1, wherein a number of the predetermined plural pieces is 4.
6. A method of displaying an image as claimed in claim 1, wherein a number of the gradation levels is 256.
7. A device for displaying an image in a display screen by displaying a gradation for each pixel, wherein:
a subfield group including a plurality of subfields each weighted with a brightness weight is formed in a field, and
an emission pattern information, which is a combination of binary values, that indicates an emitted state by a value of \u201c1\u201d or a non-emitted state by a value of \u201c0\u201d corresponding to every subfield is formed in the subfield group, and
wherein the device a controller that:
forms each of gradation levels to be displayed using predetermined plural pieces of emission pattern information;
makes an average value of each of the gradation levels to be displayed using predetermined pieces of emission pattern information equal to one of the gradation levels to be displayed; and
makes an average emission rate for every subfield to be defined by averaging the binary values corresponding to each of the same subfield; and
makes the predetermined pieces of emission pattern information preliminarily set for each of the gradation levels to be displayed so that the average emission rate of any subfield with the brightness weight smaller than a maximum brightness weight equal to or greater than 0.75 among the subfields where the average emission rate is not zero.
8. A device for displaying an image as claimed in claim 7, wherein a given level of gradation is displayed by timewise changing each of the plurality of pieces of emission pattern information, for one pixel.
9. A device of displaying an image as claimed in claim 8,
wherein a given level of gradation is displayed by spatially arranging each of the plurality of pieces of emission pattern information, for a plurality of adjacent pixels.
10. A device of displaying an image as claimed in claim 7,
wherein a given level of gradation is displayed by spatially arranging each of the plurality of pieces of emission pattern information, for a plurality of adjacent pixels.
11. A device for displaying an image as claimed in claim 7, wherein a number of the predetermined plural pieces is 4.
12. A device for displaying an image as claimed in claim 7, wherein a number of the gradation levels is 256.
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 fixed constant velocity universal joint comprising:
an outer joint member having eight axially extending arcuate ball grooves formed in a spherical inner surface thereof;
an inner joint member having eight axially extending arcuate ball grooves formed in a spherical outer surface thereof;
eight balls interposed between said ball grooves of said outer joint member and said ball grooves of said inner joint member for transmission of torque; and
a cage, interposed between said outer joint member and said inner joint member, retaining said balls;
wherein said ball grooves of said outer joint member have a center that is offset by a distance in an axial direction with respect to and on one side of the center of said spherical inner surface and said spherical outer surface, and said ball grooves of said inner joint member have a center that is offset by said distance in the axial direction with respect to and on an opposite side of the center of said spherical inner surface and said spherical outer surface;
wherein said cage comprises pockets receiving said balls therein and bars separating said pockets from each other;
wherein said bars have a cross-sectional area S comprising a hardened layer area and a non-hardened layer area C, having a Vickers hardness less than Hv513, and a ratio CS is set to be 0.30\u2266CS\u22660.75; and
wherein said cage has a thickness A, radial movement of said balls with respect to said cage at a maximum operating angle of said joint is B and 0.45\u2266BA\u22660.65.
2. The fixed constant velocity universal joint of claim 1, wherein a surface hardness of said cage ranges between HRC58 and HRC63 and core hardness ranges between HRC25 and HRC45.
3. A fixed constant velocity universal joint comprising:
an outer joint member having eight axially extending arcuate ball grooves formed in a spherical inner surface thereof;
an inner joint member having eight axially extending arcuate ball grooves formed in a spherical outer surface thereof;
eight balls interposed between said ball grooves of said outer joint member and said ball grooves of said inner joint member for transmission of torque; and
a cage, interposed between said outer joint member and said inner joint member, retaining said balls;
wherein said ball grooves of said outer joint member have a center that is offset by a distance in an axial direction with respect to and on one side of the center of said spherical inner surface and said spherical outer surface, and said ball grooves of said inner joint member have a center that is offset by said distance in the axial direction with respect to and on an opposite side of the center of said spherical inner surface and said spherical outer surface;
wherein centers of outer and inner spherical surfaces of said cage are offset by a same distance in the axial direction on opposite sides of the center of said spherical inner surface and said spherical outer surface;
wherein each of said ball grooves of said outer joint member and said inner joint member has a straight part having a straight bottom;
wherein said cage comprises pockets receiving said balls therein and bars separating said pockets from each other;
wherein said bars have a cross-sectional area S comprising a hardened layer area and a non-hardened layer area C, having a Vickers hardness less than Hv513, and a ratio CS is set to be 0.30\u2266CS\u22660.75; and
wherein said cage has a thickness A, radial movement of said balls with respect to said cage at a maximum operating angle of said joint is B and 0.65\u2266BA\u22660.85.
4. The fixed constant velocity universal joint of claim 3, wherein a surface hardness of said cage ranges between HRC58 and HRC63 and core hardness ranges between HRC25 and HRC45.