Television – Format conversion – Changing number of fields for standard conversion
Reexamination Certificate
1996-03-07
2001-10-30
Lee, Michael (Department: 2614)
Television
Format conversion
Changing number of fields for standard conversion
C348S792000
Reexamination Certificate
active
06310651
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a display apparatus used for a TV set or the like, and particularly, to a data processing method and device for converting video data into display data, which are suitable for a display apparatus capable of changing the driving condition for a display means.
2. Related Background Art
As display elements used for display apparatuses, elements using an LED array, an electron-emitting element array, an electroluminescence element, an electrochromic element, a plasma light-emitting element, or a liquid crystal element are known. Particularly, a display element using a liquid crystal element is excellent in its ability of reducing weight and size. An active matrix display element or a super twisted nematic (STN) liquid crystal element using a twisted nematic (TN) liquid crystal, a BTN liquid crystal element using a chiral nematic liquid crystal which exhibits two metastable states, and a liquid crystal element using a chiral smectic liquid crystal and called a ferroelectric liquid crystal element or an antiferroelectric liquid crystal element are especially suitable.
In a conventional display apparatus, when the frame frequency of input video data differs from the frame scanning frequency of the display means, the display image may be disturbed. For this reason, an image is displayed by synchronizing the frame frequency of the input video data with the frame scanning frequency of the display element.
However, under poor environmental conditions such as a high temperature and humidity or a low temperature, image data cannot be satisfactorily displayed in some cases. Therefore, the present inventor examined the feasibility of making the driving condition for the display element variable to optimize the display characteristics. As an example, a method of changing the frame scanning frequency of the display element in accordance with the environmental temperature was examined. However, this technique cannot be employed because it causes a difference between the frame frequency of the input video data and the frame scanning frequency of the display means, as described above.
SUMMARY OF THE INVENTION
The present invention has been made in consideration of the above technical problem, and has as its first object to provide a display apparatus capable of changing the condition to enable satisfactory display.
It is the second object of the present invention to provide a data processing method and device suitable for a display apparatus capable of changing the driving condition to enable a satisfactory display.
It is the third object of the present invention to provide a display apparatus capable of performing video/display data conversion while suppressing any difference between the video data and the display data even when the frame frequency of the input video data differs from the frame scanning frequency of a display means, and a data processing method and device for use in the display apparatus.
It is the fourth object of the present invention to provide a display apparatus capable of performing video/display data conversion suitable for intermediate processing, and a data processing method and device for use in the display apparatus.
In order to solve the problem and achieve the above object of the present invention, according to the present invention, there is provided 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, wherein a relationship between the video data and the display data is changed in response to a driving condition set by setting means for setting the driving condition for the display means.
There is also provided 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 the 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 the setting means.
There is also provided 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 the display means, and data processing means for performing read processing of the video data stored in the video data memory means in units of frames to generate the display data to be stored in the display data memory means, comprising setting means for setting a driving condition for the display means, and means for thinning the video data in units of fields in response to the predetermined driving condition set by the setting means.
There is also provided 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 the video data memory means in units of frames to generate the display data to be stored in the display data memory means, and means for thinning the video data in units of fields, wherein the data processing means reads out video data corresponding to one frame from the 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.
There is also provided 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 the video data memory means in units of frames to generate the display data to be stored in the display data memory means, 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.
The video data is preferably thinned and converted into the display data for the display means driven at a frame frequency lower than that of the video data.
The video data is preferably data with a frame consisting of a plurality of fields, and the video data is preferably thinned in units of fields and converted into the display data for the display means driven at a frame frequency lower than that of the video data.
Thinning of the video data is preferably performed by inhibiting write processing of the video data in a memory means or by inhibiting read processing of the video data stored in a memory means.
The display means is preferably a display element capable of changing a frame scanning frequency in accordance with an environmental condition.
The display means is preferably a chiral smectic liquid crystal display element or a display element having a ferroelectric liquid crystal arranged between electrodes.
According to an embodiment of the present invention, even when the driving condition is changed, a shift in processing timing caused by the difference between the frame frequency of the input video data and the frame scanning frequency of the display can be compensated for. Since an optimum driving condition for the employed display element can be selected, satisfactory display can be performed.
According to a specific embodiment of the present invention, even with a display element having a low frame scanning frequency, satisfactory display can be performed.
According to another specific embodiment of the present invention, the video data is thinned in units of fields shorter than frames. Therefore, unnatural dynamic image display can be prevented.
According to still another specific embodiment of the present invention, thinning can be performed
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Lee Michael
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