Image display apparatus
View Patent ↗The present invention provides an image display apparatus capable of reducing a hold blur in accordance with circumstances. A black inserting process for inserting a black display area into a display screen in a liquid crystal display panel 2 according to at least one of substance of a video signal in an original frame and brightness of viewing environment for user is performed. Concretely, for example, when a video signal in the original frame is a cinema signal (film signal), the black inserting process of inserting a black display area into the display screen in the liquid crystal display panel 2 is performed. More concretely, for example, a backlight driving unit 71 performs switching drive between turn-on and turn-off of a backlight 72 so that the black inserting process is performed on the display screen in the liquid crystal display panel 2.
1. An image display apparatus, comprising:
video signal processing means for performing a predetermined video signal process to improve picture quality, on a plurality of original frames along time base;
display means for displaying a video image based on a video signal subjected to the video signal process,
wherein the display means is a hold-type display, and
the video signal processing means includes:
interpolation position setting means for converting a frame rate of a video signal by inserting N interpolation frames between original frames neighboring each other along a time base, where N is an integer having a value of 1 or greater, the N interpolation frames being obtained from video images in the neighboring original frames by unequally dividing a magnitude of a video image motion vector between two such neighboring original frames into (N+1) portions so that interpolation positions, along the time base, of the video images in the N interpolation frames deviate from interpolation positions that would be obtained by equally dividing, into the (N+1) portions, the magnitude of the video image motion vector between the two neighboring original frames; and
black inserting processing means for performing a black inserting process for inserting a black display area into a display screen in the display means according to at least one of substance of a video signal in the original frame and brightness of viewing environment for user.
2. The image display apparatus according to claim 1 , wherein the display means includes:
a light source; and
a liquid crystal display panel for modulating light from the light source based on the video signal in the original frame.
3. The image display apparatus according to claim 2 , further comprising light source driving means for performing a switching drive between turn-on and turn-off of the light source so that the black inserting process is performed on the display screen in the liquid crystal display panel.
4. The image display apparatus according to claim 3 , wherein the light source driving means performs the switching drive so that a black insertion ratio, which is an area ratio of the black display area to the entire display screen, is variable when performing the black inserting process on the original frame.
5. The image display apparatus according to claim 4 , wherein the light source driving means performs the switching drive so that the black insertion ratio varies in multiple steps.
6. The image display apparatus according to claim 4 , wherein the light source driving means performs the switching drive so that the black insertion ratio continuously varies.
7. The image display apparatus according to any one of claims 4 to 6 , further comprising setting means for allowing a user to vary the black insertion ratio.
8. The image display apparatus according to claim 4 , wherein the light source driving means performs the switching drive so that the black insertion ratio varies according to a luminance histogram distribution in the original frame.
9. The image display apparatus according to claim 4 , wherein the light source driving means performs the switching drive so that the black insertion ratio varies according to the brightness of viewing environment for a user.
10. The image display apparatus according to claim 4 , wherein the light source driving means performs the switching drive so that the black insertion ratio varies according to magnitude of a motion vector in the original frame.
11. The image display apparatus according to claim 4 , wherein the light source driving means further performs the switching drive so that luminance of the black display area is variable.
12. The image display apparatus according to claim 3 , wherein the light source driving means performs the switching drive so that luminance of the black display area is variable when performing the black inserting process on the original frame.
13. The image display apparatus according to claim 12 , wherein the light source driving means performs the switching drive so that luminance of the black display area varies in multiple steps.
14. The image display apparatus according to claim 12 , wherein the light source driving means performs the switching drive so that luminance of the black display area continuously varies.
15. The image display apparatus according to any one of claims 12 to 14 , further comprising setting means for allowing a user to vary luminance of the black display area.
16. The image display apparatus according to claim 12 , wherein the light source driving means the performs switching drive so that luminance of the black display area varies according to a luminance histogram distribution in the original frame.
17. The image display apparatus according to claim 12 , wherein the light source driving means performs the switching drive so that luminance of the black display area varies according to the brightness of a viewing environment for a user.
18. The image display apparatus according to claim 12 , wherein the light source driving means performs the switching drive so that luminance of the black display area varies according to magnitude of a motion vector in the original frame.
19. The image display apparatus according to claim 3 , wherein the light source driving means performs the switching drive so that the black inserting process is performed by frame.
20. The image display apparatus according to claim 3 , wherein the light source driving means performs the switching drive so that the black inserting process is performed by a black insertion line unit composed of a predetermined number of horizontal scan line or lines in the original frame.
21. The image display apparatus according to claim 20 , wherein the display means or the video signal processing means performs the switching drive so that the black inserting process is performed by the black insertion line unit and by frame.
22. The image display apparatus according to claim 20 , wherein the display means or the video signal processing means performs the switching drive so that the black inserting process is performed by inserting a plurality of black insertion lines away from each other.
23. The image display apparatus according to claim 2 , wherein the light source includes an LED.
24. The image display apparatus according to claim 1 , further comprising setting means for allowing a user to perform the black inserting process.
25. The image display apparatus according to claim 1 , wherein the black inserting process is performed when the video signal is a cinema signal.
26. The image display apparatus according to claim 25 , wherein whether a video signal in an original frame is a cinema signal or not is determined using contents information of the original frame, the contents information being included in an EPG (Electronic Program Guide).
27. The image display apparatus according to claim 25 , wherein whether a video signal in an original frame is a cinema signal or not is determined based on a frame rate of the original frame.
28. The image display apparatus according to claim 1 , wherein the black inserting process is performed according to a luminance histogram distribution in the original frame.