1. A driving method for driving a plasma display panel comprising the steps of:
applying scan pulses within an addressing period of a sub-field and then sustain pulses within a sustain period of said sub-field;
wherein a width of scan pulses appearing in a first sub-field are narrower than scan pulses appearing in a second sub-field when the number of sustain pulses of said first sub-field is more than in said second sub-field.
2. A driving method for driving a plasma display panel comprising the steps of:
applying scan pulses within an addressing period of a sub-field and then sustain pulses within a sustain period of said sub-field;
wherein a width of scan pulses appearing in a first sub-field following a second sub-field are narrower than scan pulses appearing in the second sub-field, while a time interval between the second sub-field and the first sub-field, which provides light emission just after the second sub-field, is decreased.
3. A driving method for driving a plasma display panel comprising the steps of:
applying scan pulses within an addressing period of a sub-field and then sustain pulses within a sustain period of said sub-field;
wherein a width of scan pulses appearing in a first sub-field are narrower than scan pulses appearing in a second sub-field when the number of sustain pulses in the second sub-field which proves light emission just previously to said first sub-field is less than in said first sub-field.
4. A driving method for driving a plasma display panel comprising the steps of:
applying scan pulses within an addressing period of a sub-field and then sustain pulses within a sustain period of said sub-field; and
making the number of sustain pulses for a sustaining period in each sub-field larger as an average luminance level of a frame including said each sub-field decreases;
wherein a width of scan pulses appearing in a first sub-field are narrower than scan pulses appearing in a second sub-field when the number of sustain pulses of said first sub-field is more than in said second sub-field.
5. A driving circuit for driving a plasma display panel comprising:
a pulse applying portion which applies scan pulses within an addressing period of a sub-field and then sustain pulses within a sustain period of said sub-field;
wherein a width of scan pulses appearing in a first sub-field are narrower than scan pulses appearing in a second sub-field when the number of sustain pulses in said first sub-field is more than in said second sub-field.
6. A driving circuit for driving a plasma display panel comprising:
a period varying circuit which makes an addressing period of a sub-field shorter as the number of sustain pulses in a sustaining period in said sub-field increases, wherein said period varying circuit comprises:
a sub-field controller which arranges an inputted image signal in each sub-field;
a sustain pulse number controller which outputs the number of sustain pulses for a sustaining period in each sub-field in association with an output signal from said sub-field controller; and
a memory circuit which stores pulse width of scan pulses in said addressing period, said pulse width being set in association with the number of said sustain pulses in said each sub-field.
7. A driving circuit for driving a plasma display panel comprising:
a pulse applying portion which applies scan pulses within an addressing period of a sub-field and then sustain pulses within a sustain period of said sub-field;
wherein a width of scan pulses appearing in a first sub-field following a second sub-field are narrower than scan pulses appearing in the second sub-field, while a time interval between the second sub-field and the first sub-field, which provides light emission just after the second sub-field, is decreased.
8. A driving circuit for driving a plasma display panel comprising:
a pulse applying portion which applies scan pulses within an addressing period of a sub-field and then sustain pulses within a sustain period of said sub-field;
wherein a width of scan pulses appearing in a first sub-field are narrower than scan pulses appearing in a second sub-field when the number of sustain pulses in the second sub-field which provides light emission just previously to said first sub-field is less than in said first sub-field.
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. An endoscope comprising an inserting section and an operating section, wherein
the inserting section comprises at a plurality of positions a variable-rigidity mechanism capable of varying rigidity when applied with a voltage, and
the operating section comprises:
a rigidity-variation controlling section for varying rigidity by controlling the variable-rigidity mechanism; and
a rigidity-variation operating section for making a direction for varying rigidity to the rigidity-variation controlling section.
2. The endoscope as claimed in claim 1, wherein the operating section comprises a plurality of inputting sections, and a surgeon can assign a function of the rigidity-variation operating section to one of the plurality of inputting sections.
3. The endoscope as claimed in claim 2, wherein the variable-rigidity mechanism extends in a longitudinal direction when applied with a voltage.
4. The endoscope as claimed in claim 2, wherein the variable-rigidity mechanism contracts in a thickness direction when applied with a voltage.
5. The endoscope as claimed in claim 2, wherein a distortion amount of the variable-rigidity mechanism is proportional to an approximate square of an electric field strength based on a voltage applied to the variable-rigidity mechanism.
6. The endoscope as claimed in claim 2, wherein the variable-rigidity mechanism comprises an electropolymer artificial muscle.
7. The endoscope as claimed in claim 4, wherein a distortion amount of the variable-rigidity mechanism is proportional to the approximate square of an electric field strength based on a voltage applied to the variable-rigidity mechanism.
8. The endoscope as claimed in claim 4, wherein the variable-rigidity mechanism comprises an electropolymer artificial muscle.
9. The endoscope as claimed in claim 5, wherein the variable-rigidity mechanism comprises an electropolymer artificial muscle.
10. The endoscope as claimed in claim 7, wherein the variable-rigidity mechanism comprises an electropolymer artificial muscle.
11. The endoscope as claimed in claim 3, wherein the variable-rigidity mechanism contracts in a thickness direction when applied with a voltage.
12. The endoscope as claimed in claim 3, wherein a distortion amount of the variable-rigidity mechanism is proportional to the approximate square of an electric field strength based on a voltage applied to the variable-rigidity mechanism.
13. The endoscope as claimed in claim 3, wherein the variable-rigidity mechanism comprises an electropolymer artificial muscle.
14. The endoscope as claimed in claim 12, wherein the variable-rigidity mechanism comprises an electropolymer artificial muscle.
15. The endoscope as claimed in claim 11, wherein a distortion amount of the variable-rigidity mechanism is proportional to the approximate square of an electric field strength based on a voltage applied to the variable-rigidity mechanism.
16. The endoscope as claimed in claim 11, wherein the variable-rigidity mechanism comprises an electropolymer artificial muscle.
17. The endoscope as claimed in claim 15, wherein the variable-rigidity mechanism comprises an electropolymer artificial muscle.
18. The endoscope as claimed in claim 2, wherein the plurality of inputting sections comprise a trackball.
19. The endoscope as claimed in claim 2, wherein the plurality of inputting sections comprise at least one scope switch.
20. The endoscope as claimed in claim 2, wherein the plurality of inputting sections are provided symmetrically with respect to a center axis in a longitudinal direction of the operating section.
21. The endoscope as claimed in claim 1, wherein the rigidity-variation controlling section performs servo-processing to the variable-rigidity mechanism.
22. The endoscope as claimed in claim 1, wherein the rigidity-variation controlling section ends a processing of variable-rigidity control, when detecting a deviation from a variable rigidity range of the variable-rigidity mechanism.
23. The endoscope as claimed in claim 1, wherein the inserting section comprises a flexible portion, and the variable-rigidity mechanism is provided to the flexible portion.
24. The endoscope as claimed in claim 1, wherein the plurality of positions are two positions.
25. The endoscope as claimed in claim 1, further comprising an endoscope shape detecting section for displaying an image of a shape of the inserting section on a display section, wherein
a rigidity of the variable-rigidity mechanism is displayed on the display section along with the image of the shape of the inserting section.