HOLD TYPE IMAGE DISPLAY SYSTEM
The present invention aims to prevent display luminance difference and burning with a line at which the polarity inversion switches when the order of inversion of black and video changes in the middle of the screen by a frame polarity inversion drive in a liquid crystal display device for performing black insertion drive. An enable signal (VOE) to each gate driver 5 A to 5 N is independently controlled, a start pulse (VSP) input to write a black signal is performed at an arbitrary timing within one frame period with respect to the gate driver 5 A to insert a black image within one frame period, a write polarity of the video signal is inverted in frame cycle with the video display start pulse as a base point, and a write polarity of the black image signal is inverted in frame cycle with the black display start pulse as a base point.
1 . A hold type image display system for displaying a video on a display panel by controlling a video signal to be input to a source line and a gate line of the display panel, the hold type image display system comprising:
a source driver for outputting a video signal to the source line;
a gate driver for outputting a scanning signal to the gate line; and
a controller for receiving an input video signal and thereby controlling the source driver and the gate driver; wherein
the controller outputs a video signal in which a black or gray line is inserted between video lines to the source driver, outputs a start pulse signal for writing the video lines for one or more times and a start pulse signal for writing black or gray lines for one or more times to the gate driver within one frame period, and inverts a write polarity of the video signal and a write polarity of the black or gray signal in frame cycle; and
the controller scrolls a black band in a screen of the display panel during one frame.
2 . The hold type image display system according to claim 1 , wherein
the controller inverts the write polarity of the video signal with a point of writing the video signal to a first line of the frame as a base point, and inverts the write polarity of the black or gray signal with a point of writing the black or gray signal to the first line of the frame as a base point.
3 . The hold type image display system according to claim 1 , wherein the controller changes a timing of input of the start pulse signal to the gate driver to write the black or gray lines with respect to input of the start pulse signal to the gate driver to write the video signal based on black or gray insertion rate information.
4 . The hold type image display system according to claim 1 , wherein the controller determines a black or gray insertion rate according to a display, and changes a timing of input of the start pulse signal to the gate driver to write the black or gray lines with respect to input of the start pulse signal to the gate driver to write the video lines based on the determined black or gray insertion rate.
5 . The hold type image display system according to claim 1 , wherein the controller outputs the black or gray line signals to the source driver during a blanking period existing between preceding and following frame periods.
6 . The hold type image display system according to claim 1 , further comprising a backlight on a rear surface of the display panel; wherein
the controller compares the preceding and following video signals in one frame unit, and adjusts a relationship between a black or gray insertion rate and a light control luminance of the backlight based on the comparison result.
7 . A control system of a hold type image display system for drive displaying a video on a display panel by controlling a video signal to a source line of the display panel in a source driver and controlling a signal to a gate line of the display panel in a gate driver; the control system comprising:
a controller for receiving an input video signal and thereby controlling the source driver and the gate driver; wherein
the controller outputs a video signal in which a black or gray line is inserted between video lines to the source driver, outputs a start pulse signal for writing the video lines for one or more times and a start pulse signal for writing black or gray lines for one or more times to the gate driver within one frame period, and inverts a write polarity of the video signal and a write polarity of the black or gray signal in frame cycle; and
the controller scrolls a black band in a screen of the display panel during one frame.
8 . The control system of the hold type image display system according to claim 7 , wherein
the controller inverts the write polarity of the video signal with a point of writing the video signal to a first line of the frame as a base point, and inverts the write polarity of the black or gray signal with a point of writing the black or gray signal to the first line of the frame as a base point.
9 . The control device of the hold type image display system according to claim 7 , wherein the controller changes a timing of input of the start pulse signal to the gate driver to write the black or gray lines with respect to input of the start pulse signal to the gate driver to write the video lines based on black or gray insertion rate information.
10 . The control device of the hold type image display system according to claim 7 , wherein the controller determines a black or gray insertion rate according to a display, and changes a timing of input of the start pulse signal to the gate driver to write the black or gray lines with respect to input of the start pulse signal to the gate driver to write the video lines based on the determined black or gray insertion rate.
11 . The control device of the hold type image display system according to claim 10 , wherein the controller outputs the black or gray line signals to the source driver during a blanking period existing between preceding and following frame periods.
12 . The control device of the hold type image display system according to claim 7 , wherein the controller compares the preceding and following image signals in one frame unit, and adjusts a relationship between a light control luminance of a backlight arranged on a rear surface of the display panel and the black or gray insertion rate based on the comparison result.
13 . A hold type image display method for displaying a video on a display panel by controlling a video signal to a source line of a display panel in a source driver and controlling a signal to a gate line of the display panel in a gate driver, the hold type image display method comprising:
outputting a video signal in which a black or gray line is inserted between video lines to the source driver;
outputting a start pulse signal for writing the video lines for one or more times and a start pulse signal for writing black or gray lines for one or more times to the gate driver within one frame period;
scrolling a black band in a screen of the display panel during one frame; and
inverting a write polarity of the video signal and a write polarity of the black or gray signal in frame cycle.
14 . The hold type image display method according to claim 13 , wherein the write polarity of the video signal is inverted with a point of writing the video signal to a first line of the frame as a base point, and the write polarity of the black or gray signal is inverted with a point of writing the black or gray signal to the first line of the frame as a base point.
15 . The hold type image display method according to claim 13 , wherein a timing of input of the start pulse signal to the gate driver to write the black or gray lines with respect to input of the start pulse signal to the gate driver to write the video lines is changed based on black or gray insertion rate information.
16 . The hold type image display method according to claim 13 , wherein a black or gray insertion rate is determined according to a display, and a timing of input of the start pulse signal to the gate driver to write the black or gray lines with respect to input of the start pulse signal to the gate driver to write the video lines is changed based on the determined black or gray insertion rate.
17 . The hold type image display method according to claim 13 , wherein the black or gray line signals are output to the source driver during a blanking period existing between preceding and following frames periods.
18 . The hold type image display method according to claim 13 , the preceding and following video signals of one frame unit are compared, and a relationship between a light control luminance of backlight arranged on a rear surface of the display panel and a black or gray insertion rate is adjusted based on the comparison result.