1. A developing device, comprising:
a development container to contain a developer, the development container having an opening;
a development roller mounted near the opening of the development container;
a conveying member movably mounted in the development container to supply the developer to the development roller, the conveying member moving forward and backward in a direction of the opening; and
at least one dispersing member to operate according to the forwardbackward movement of the conveying member to disperse the developer in the development container.
2. The developing device according to claim 1, wherein:
the conveying member includes a pressing part in contact with the dispersing member; and
the dispersing member includes a fixing portion fixed in the development container and a dispersing portion extending from the fixing portion by a predetermined length,
whereby the dispersing portion is elastically deformed to pivot at a predetermined angle by operation of the pressing part.
3. The developing device according to claim 2, further comprising:
an operating shaft rotatably mounted in the development container and having an eccentric portion in contact with the conveying member to cause the forwardbackward movement of the conveying member; and
at least one return spring mounted in the development container to return the conveying member.
4. The developing device according to claim 3, wherein the pressing part of the conveying member has a first end in contact with the dispersing member and a second end in contact with the eccentric portion of the operating shaft.
5. The developing device according to claim 3, further comprising:
plural gears coupled to a shaft of the development roller and the operating shaft to transmit a rotational force from the shaft of the development roller to the operating shaft.
6. The developing device according to claim 1, wherein:
the conveying member has a flat plate shape and is formed with a guide slot extending lengthwise in a direction crossing the forwardbackward moving direction of the conveying member to guide the operation of the dispersing member; and
the dispersing member includes a fixing portion fixed in the development container, a dispersing portion extending from the fixing portion by a predetermined length so as to be elastically deformed, and a protruding portion protruding from the dispersing portion to be fitted into the guide slot,
whereby when the conveying member moves forward and backward, the dispersing portion pivots.
7. The developing device according to claim 1, wherein the dispersing member includes a first dispersing member and a second dispersing member respectively mounted near both side ends in the development container.
8. An image forming apparatus, comprising:
a main body;
a photosensitive body mounted in the main body; and
a developing device to supply a developer to the photosensitive body, the developing device comprising:
a development container to contain a developer, the development container having an opening,
a development roller mounted near the opening of the development container,
a conveying member movably mounted in the development container to supply the developer to the development roller, the conveying member moving forward and backward in a direction of the opening, and
at least one dispersing member to operation according to the forwardbackward movement of the conveying member to disperse the developer in the development container.
9. The image forming apparatus according to claim 8, wherein:
the conveying member includes a pressing part in contact with the dispersing member; and
the dispersing member includes a fixing portion fixed in the development container and a dispersing portion extending from the fixing portion by a predetermined length,
whereby the dispersing portion is elastically deformed to pivot at a predetermined angle by operation of the pressing part.
10. The image forming apparatus according to claim 9, wherein the developing device further includes:
an operating shaft rotatably mounted in the development container and having an eccentric portion in contact with the conveying member to cause the forwardbackward movement of the conveying member; and
at least one return spring mounted in the development container to return the conveying member.
11. The image forming apparatus according to claim 10, wherein the pressing part of the conveying member has a first end in contact with the dispersing member, and a second end in contact with the eccentric portion of the operating shaft.
12. The image forming apparatus according to claim 10, wherein the developing device further comprises:
a plurality of gears coupled to a shaft of the development roller and the operating shaft to transmit a rotational force from the shaft of the development roller to the operating shaft.
13. The image forming apparatus according to claim 8, wherein:
the conveying member has a flat plate shape, and is formed with a guide slot extending lengthwise in a direction crossing the forwardbackward moving direction of the conveying member to guide the operation of the dispersing member; and
the dispersing member includes a fixing portion fixed in the development container, a dispersing portion extending from the fixing portion by a predetermined length so as to be elastically deformed, and a protruding portion protruding from the dispersing portion to be fitted into the guide slot,
whereby when the conveying member moves forward and backward, the dispersing portion pivots.
14. A developing device, comprising:
a development container to contain developer;
a development roller to transfer the developer from the development container to a printing medium;
a conveying member to convey the developer to the development roller; and
at least one dispersing member to elastically deform and disperse the developer in the development container based on a movement of the conveying member.
15. The developing device of claim 14, further comprising:
an operating shaft to control the movement of the conveying member according to a rotation of a shaft of the development roller.
16. The developing device of claim 15, wherein the operating shaft comprises:
at least one eccentric portion to contact a portion of the conveying member to push the conveying member away from the development roller based on the rotation of the operating shaft.
17. The developing device of claim 15, wherein the conveying member comprises:
at least one pressing part to contact a portion of the operating shaft to guide the movement of the conveying member based on the rotation of the operating shaft.
18. The developing device of claim 17, wherein the at least one pressing part presses against a portion of the at least one dispersing member to deform the at least one dispersing member in order to disperse the developer in the development container.
19. The developing device of claim 14, further comprising:
a cover to enclose the conveying member within the development container; and
a return spring connected at one end to the cover and at another end to the conveying member to provide an elastic force to return the conveying member.
20. The developing device of claim 14, wherein the conveying member comprises:
at least one guide slot corresponding to the at least one dispersing member to control the elastic deformation of the dispersing member based on the movement of the conveying member.
21. The developing device of claim 20, wherein the at least one dispersing member comprises:
a protruding portion to insert within the guide slot to direct the elastic deformation of the at least one dispersing member during the movement of the conveying member.
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. Method for processing video data for display on a display device having a plurality of luminous elements corresponding to the pixels of a picture, wherein a time of a video frame or field is divided into a plurality of sub-fields during which the luminous elements can be activated for light emission in small pulses corresponding to a sub-field code word of n bits used for en-coding the p possible video levels lighting a pixel, comprising the steps of:
encoding a first part of the picture using a first encoding method, wherein among the set of possible video levels for lighting a pixel, a sub-set of m video levels with n<m<p is selected, which is used for light generation, said m values being selected according to the rule that the temporal centre of gravity for the light generation of the corresponding sub-field code words grows continuously with the video level,
selecting said first part of the picture on the basis of predetermined criteria including an area having a predetermined skin colour, determined by the phase angle and amplitude of a colour space diagram, or a grey tone, and
encoding at least one second part different from said first part of the picture using a second encoding method different from said first encoding method.
2. Method according to claim 1, wherein the selection criteria for said first part are:
homogeneous area having a size larger than a predetermined minimum size.
3. Method according to claim 2, wherein said homogeneous area has a predetermined texture.
4. Method according to claim 1, wherein the first encoding method is not used in an area, if the skewness of said area is larger than a minimum skewness and a kurtosis of said area is larger than an minimum kurtosis.
5. Device for processing video data for display on a display device having a plurality of luminous elements corresponding to the pixels of a picture, wherein a time of a video frame or field is divided into a plurality of sub-fields during which the luminous elements can be activated for light emission in small pulses corresponding to a sub-field code word of n bits used for encoding the p possible video levels lighting a pixel, comprising:
encoding means for encoding a first part of the picture using a first encoding method, wherein among a pregiven set of possible video levels for lighting a pixel, a sub-set of m video levels with n<m<p is selected, which is used for light generation, said m values being selected according to the rule that the temporal centre of gravity for the light generation of the corresponding sub-field code words grow continuously with the video level,
selecting means connected to said encoding means for selecting said first part of the picture on the basis of predetermined criteria including a predetermined skin colour, determined by the phase angle and amplitude of a colour space diagram, or a grey tone,
wherein said encoding means is adapted for encoding at least one second part different from said first part of the picture using a second encoding method different from said first encoding method.
6. Device according to claim 5, wherein the selection criteria for said first part are:
homogeneous area having a size larger than a predetermined minimum size.
7. Device according to claim 5, wherein the first encoding method is not used in an area, if the skewness of said area is larger than a minimum skewness and a kurtosis of said area is larger than a minimum kurtosis.