Data processing method and device for use in display apparatus

• US 6,310,651 B1
• Filed: 03/07/1996
• Issued: 10/30/2001
• Est. Priority Date: 03/14/1995
• Status: Expired due to Fees

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Mizutome, Atsushi
• Primary Examiner(s): Lee, Michael
• Application Number:
  US08/612,411
• Time in Patent Office: 2,063 Days
• Field of Search: H04/N.701, H04/N.964, 348/739, 348/790, 348/792, 348/793, 348/441, 348/443, 348/459, 348/715, 348/718, 348/671, 348/674, 348/554, 348/555, 348/558, 345/185, 345/200, 345/533, 345/546, 345/547, 345/153
• US Class Current: 348/459
• CPC Class Codes: G09G 2310/0227 related to multiple interlacing, i.e. involving more fields than just one odd field and one even field
• CPC Class Codes: G09G 2310/0232 Special driving of display border areas
• CPC Class Codes: G09G 2310/04 Partial updating of the display screen
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 2360/02 Graphics controller able to handle multiple formats, e.g. input or output formats
• CPC Class Codes: G09G 3/2059 using error diffusion
• CPC Class Codes: G09G 3/3629 using liquid crystals having memory effects, e.g. ferroelectric liquid crystals
• CPC Class Codes: G09G 3/3651 using multistable liquid crystals, e.g. ferroelectric liquid crystals

Abstract

A data processing system that allows satisfactory display even when the driving condition changes. The data processing system includes a display device, a video data memory which stores video data in which one frame consists of a plurality of fields, and a display data memory which stores display data to be displayed on the display device. A setting unit sets the driving condition for the display device, and thins the video data in units of fields.

Claims

1. A data processing method for use in a display apparatus for storing input video data and outputting display data based on the stored video data to display means, comprising the steps of:

changing a relationship between the video data and the display data in response to a driving condition set by setting means for setting the driving condition for said display means, wherein the video data is data with a frame consisting of a plurality of field;

thinning the video data in units of fields and converting into the display data for said display means driven at a frame frequency lower than that of the video data, and

reading out, and subjecting the video data to at least one of a pseudo halftone processing or γ

-correction per frame.

2. A method according to claim 1, wherein said step of thinning of the video data is performed by inhibiting write processing of the video data in a memory means.

3. A method according to claim 1, wherein said step of thinning of the video data is performed by inhibiting read processing of the video data stored in memory means.

4. A data processing device for use in a display apparatus for storing input video data and outputting display data based on the stored video data to display means, comprising:

convert means for changing a relationship between the video data and the display data in response to a driving condition set by setting means for setting the driving condition for said display means, wherein the video data is data with a frame consisting of a plurality of fields, and the video data is thinned in units of fields and converted into the display data for said display means driven at a frame frequency lower than that of the video data, and said data processing device subjects the video data read out to at least one of a pseudo halftone processing or γ

-correction per frame.

5. A device according to claim 4, wherein thinning of the video data is performed by inhibiting write processing of the video data in a memory means.

6. A device according to claim 4, wherein thinning of the video data is performed by inhibiting read processing of the video data stored in memory means.

7. A display apparatus for storing input video data and outputting display data based on the stored video data to display means, comprising

setting means for setting a driving condition for said display means, and convert means for changing a relationship between the video data and the display data in response to the driving condition set by said setting means, wherein the video data is data with a frame consisting of a plurality of fields, and the video data is thinned in units of fields and converted into the display data for said display means driven at a frame frequency lower than that of the video data, and said display device subjects the video data read out to at least one of a pseudo halftone processing or γ

-correction per frame.

8. An apparatus according to claim 7, wherein said display means is a display element capable of changing a frame scanning frequency in accordance with an environmental condition.

9. An apparatus according to claim 7, wherein said display means is a chiral smectic liquid crystal display element.

10. An apparatus according to claim 7, wherein said display means is a display element having a ferroelectric liquid crystal arranged between electrodes.

11. An apparatus according to claim 7, wherein thinning of the video data is performed by inhibiting write processing of the video data in a memory means.

12. An apparatus according to claim 7, wherein thinning of the video data is performed by inhibiting read processing of the video data stored in memory means.

13. A display apparatus having display means, video data memory means for storing video data in which a frame consists of a plurality of fields, display data memory means for storing display data to be displayed on said display means, and data processing means for performing read processing of the video data stored in said video data memory means in units of frames to generate the display data to be stored in said display data memory means, comprising:

setting means for setting a driving condition for said display means, and means for thinning the video data in units of fields in response to the predetermined driving conditions set by said setting means, and said display device subjects the video data read out to at least one of a pseudo halftone processing or γ

-correction per frame.

16. An apparatus according to claim 13, wherein said data processing means has a circuit for performing halftone processing.

14. A data processing device for use in a display apparatus, comprising video data memory means for storing video data in which a frame consists of n fields, display data memory means for storing display data to be displayed on display means, data processing means for performing read processing of the video data stored in said video data memory means in units of frames to generate the display data to be stored in said display data memory means, and means for thinning the video data in units of fields,

wherein said data processing means reads out video data corresponding to one frame from said video data memory means, the video data consisting of video data of L fields of the n fields constituting an ith frame and video data of (n−

L) fields of the n fields constituting an (i+1)th frame, and wherein the video data is data with a frame consisting of a plurality of fields, and the video data is thinned in units of fields and converted into the display data for said display means driven at a frame frequency lower than that of the video data, and said data processing device subjects the video data read out to at least one of a pseudo halftone processing or γ

-correction per frame.

17. A device according to claim 14, wherein said data processing means has a circuit for performing halftone processing.

15. A data processing device for use in a display apparatus, comprising video data memory means including m field memories for storing video data in which a frame consists of n fields in units of fields, display data memory means for storing display data of at least one frame to be displayed on display means, and data processing means for performing read processing of the video data stored in said video data memory means in units of frames to generate the display data to be stored in said display data memory means, and wherein display data of one frame is generated by reading and processing video data of n latest fields of video data of m fields stored in the m field memories, and wherein the video data is data with a frame consisting of a plurality of fields, and the video data is thinned in units of fields and converted into the display data for said display means driven at a frame frequency lower than that of the video data, and said data processing device subjects the video data read out to at least one of a pseudo halftone processing or γ

-correction per frame.

18. A device according to claim 15, wherein said data processing means has a circuit for performing halftone processing.

19. A display apparatus having a display panel constituted by arranging scanning signal electrodes and information signal electrodes in a matrix and sandwiching, between said electrodes, a liquid crystal having memory properties and temperature dependence on a driving condition, and driven by applying a scanning signal and an information signal to said scanning signal electrodes and said information signal electrodes, respectively, comprising:

video data memory means for synthesizing video data which is input while being divided into a plurality of fields into video data of one frame and storing the video data;

halftone processing means for reading the video data of one frame from said video data memory means and performing halftone processing to convert the video data into display data for said display panel;

display data memory for storing the display data;

driving setting means for setting the driving condition for said display panel; and

video data control means for detecting the driving condition for said display means in accordance with a signal from said driving setting means and controlling write/read processing to/from said video data memory means so that the input video data is thinned in units of fields, with any given frame of the input video data having no more than one field thinned.

20. An apparatus according to claim 19, wherein said video data memory means comprises a plurality of frame memories.

21. An apparatus according to claim 19, wherein said video data memory means comprises a plurality of field memories.

22. An apparatus according to claim 19, wherein said video data memory means comprises a plurality of dual port memories.

23. An apparatus according to claim 19, wherein said display data memory means comprises a plurality of dual port memories.

24. An apparatus according to claim 19, wherein said intermediate processing means uses an error diffusion method.

25. An apparatus according to claim 19, wherein said display panel is a ferroelectric liquid crystal panel.

26. An apparatus according to claim 19, wherein said display panel is a panel having a chiral nematic liquid crystal which exhibits two metastable states.

27. An apparatus according to claim 19, wherein said display panel is a panel using a chiral smectic liquid crystal.