Display apparatus for reducing distortion of a displayed image
First Claim
1. A display apparatus, in which one field is divided into a plurality of sub-fields, and a relative ratio of luminescent time of each sub-field is previously determined so that by determining a combination of luminescence and non-luminescence in respective sub-fields for a picture element, a gradation level representing by a total sum of said luminescent time in said one filed is established to provide a half-tone display, comprising:
- code conversion means for converting a picture signal into a coded signal including a plurality of bits which indicate said combination of luminescence and non-luminescence in said respective sub-fields,wherein, when a gradation level of said picture element changes from a first level in which a first display is performed by luminescence in a first sub-field which has a first relative ratio of luminescent time to a second level in which a second display is performed by luminescence in a second sub-field which has a second relative ratio of luminescent time which is greater than said first relative ratio or when said gradation level changes from said second level to said first level, said code conversion means provides a code conversion when said gradation level is in said second level, and a third display is performed by luminescence in a third sub-field which has a third relative ratio of luminescent time which is not greater than said first relative ratio.
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Accused Products
Abstract
A display apparatus, in which one field is divided into a plurality of sub-fields, and a relative ratio of luminescent time of each sub-field is previously determined so that by determining a combination of luminescence and non-luminescence in respective sub-fields for a picture element. The apparatus has a code converter for converting a picture signal into a coded signal including a plurality of bits which indicate the combination of luminescence and non-luminescence in the respective sub-fields. When the gradation of the picture element changes from a first level in which a first display is performed by luminescence in a first sub-field having a second relative ratio to a second level in which a second display is performed by luminescence in a second sub-field having a second relative ratio of luminescent time which is greater than the first relative ratio or when the gradation changes from the second level to the first level, the code converter provides a code conversion such that, when the gradation is in the second level, a third display is performed by luminescence in a third sub-field which has a third relative ratio of luminescent time which is not greater than the first relative ratio.
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Citations
25 Claims
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1. A display apparatus, in which one field is divided into a plurality of sub-fields, and a relative ratio of luminescent time of each sub-field is previously determined so that by determining a combination of luminescence and non-luminescence in respective sub-fields for a picture element, a gradation level representing by a total sum of said luminescent time in said one filed is established to provide a half-tone display, comprising:
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code conversion means for converting a picture signal into a coded signal including a plurality of bits which indicate said combination of luminescence and non-luminescence in said respective sub-fields, wherein, when a gradation level of said picture element changes from a first level in which a first display is performed by luminescence in a first sub-field which has a first relative ratio of luminescent time to a second level in which a second display is performed by luminescence in a second sub-field which has a second relative ratio of luminescent time which is greater than said first relative ratio or when said gradation level changes from said second level to said first level, said code conversion means provides a code conversion when said gradation level is in said second level, and a third display is performed by luminescence in a third sub-field which has a third relative ratio of luminescent time which is not greater than said first relative ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A display system comprising:
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a display arranged to illuminate at least one pixel during at least part of one time field subdivided into a plurality of time sub-fields, each time sub-field having a distinct address period and a relative luminance or nonluminance period with respect to the other time sub-fields; a code converter for converting an image signal into a coded signal representing bits indicative of a luminance state or a nonluminance state for each time sub-field during the at least one time field; a driver for applying electrical energy to the display for the luminance state of at least one time sub-field displaying the at least one pixel consistent with the bits; and a controller for controlling the code converter and the driver to display a gradation level represented by a sum of said relative luminance periods during a corresponding time field, the code converter adapted to change the gradation level during the display of sequential sub-fields such that the relative luminance period of a select sub-field is varied in response to the occurrence of a defined sequence of gradation changes. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification