Video image display method and display panel using it
View Patent ↗The present invention relates to a method of displaying a color video image in a sequential color display panel. The video frame is divided into a plurality of consecutive time segments each assigned to a given color component, and the video level of the pixels of the image is displayed by modulating the display time of the corresponding cells. The invention aims to propose a display method that reduces the blurring effect without causing color break-up. According to the invention, at least one reference time segment is defined in said plurality of time segments, and the image is displayed giving priority to lighting the cells during the reference time segment and the time segments closest to the reference time segment.
1. A method of displaying a video image in a sequential colour display panel including a plurality of display cells, wherein the video image to be displayed comprises a plurality of colour components and the image display period is divided into a plurality of consecutive time segments with at least three time segments assigned to each of the colour components, and wherein the video level of the pixels of the image is displayed by modulating the display time of the corresponding cells, the method comprising:
defining at least one reference time segment in said plurality of time segments, said at least one reference time segment being in the vicinity of the middle of the image display period, and
displaying the image giving priority to lighting the cells during the at least one reference time segment and the time segments closest to the at least one reference time segment for each colour component of the plurality of colour components, the at least one reference time segment being assigned to one colour component and the time segments closest to the reference time segment being assigned to the other colour components of the plurality of colour components, a same quantity of light being emitted on either side of an axis of symmetry situated at the centre of said at least one reference time segment, wherein, if a cell is not lit throughout a time segment, the cell is lit during the portion of the time segment closest to the reference time segment.
2. The method according to claim 1 , wherein the image signal comprises three colour components, namely a red component, a green component and a blue component, and the reference time segment is assigned to the green component.
3. The method according to claim 1 , wherein the plurality of cells is a valve of liquid crystal on silicon cells.
4. The method according to claim 1 , wherein the plurality of cells is a valve of micromirror cells.
5. The method according to claim 1 , wherein the plurality of cells is a valve of organic light-emitting diode cells.
6. A sequential display panel for displaying a video image comprising:
a plurality of display cells, the video image to be displayed being supplied to the panel in the form of a signal comprising a plurality of colour components, wherein the image display period is divided into a plurality of consecutive time segments with at least three time segments assigned to each of the colour components and the video level of the pixels of the image is displayed by modulating the display time of the corresponding cells; and,
a means for displaying the image by giving priority to lighting the cells during a reference time segment selected from said plurality of time segments and during the time segments closest to the reference time segment for each colour component of the plurality of colour components, said reference time segment being in the vicinity of the middle of the image display period, the at least one reference time segment being assigned to one colour component and the time segments closest to the reference time segment being assigned to the other colour components of the plurality of colour components, a same quantity of light being emitted on either side of an axis of symmetry situated at the centre of said at least one reference time segment, wherein, if a cell is not lit throughout a time segment, the cell is lit during the portion of the time segment closest to the reference time segment.