Image display device and method of displaying image
First Claim
1. An image display device comprising:
- an image inputting unit configured to input an input image;
a display ratio controller which controls a black display ratio which is a ratio of a period for displaying a black image in one frame period in a frame of the input image;
a period setting unit which sets a black display period and an image display period for displaying the frame on the basis of the black display ratio;
a brightness compensator which obtains brightness compensation information for compensating brightness of the frame according to the black display ratio; and
a display which displays the frame and the black image,the display ratio controller comprising;
a ratio fixer which determines the black display ratio;
a transient black display time ratio calculator which calculates a transient black display ratio, which is a ratio between the current black display ratio fixed by the ratio fixer and a new black display ratio fixed by the ratio fixer; and
a transient black display time ratio setting unit which sets the black display ratio relating at least to the display of one frame from the current black display ratio to the transient black display ratio and then setting the black display ratio to the new black display ratio,wherein the display displays a brightness compensation image based on the brightness compensation information and the frame in the image display period, and displays the black image in the black display period.
1 Assignment
0 Petitions
Accused Products
Abstract
It is an object of the invention to provide an image display device for improving the image quality of moving images and still images displayed on a liquid crystal display device while controlling increase in power consumption. A liquid crystal panel for performing input image display and black image display at an arbitrary black display time ratio in one frame period, a movement detection unit for detecting a movement of the input image and outputting movement information, a display ratio control unit for fixing the black display time ratio based on the movement information, and a display brightness control unit for controlling brightness of the liquid crystal panel for one frame period to be substantially constant irrespective of the black display period are provided. The movement detection unit detects whether the input image is a moving image or a still image, and the display ratio control unit sets at least one transient black display time ratio between the black display time ratios for the moving image and the still image which is determined according to the result of the movement detection unit, so that the black display time ratio changes midway to the transient black display time ratio in the period when the black display time ratio is switched between the moving image and the still image.
-
Citations
38 Claims
-
1. An image display device comprising:
-
an image inputting unit configured to input an input image; a display ratio controller which controls a black display ratio which is a ratio of a period for displaying a black image in one frame period in a frame of the input image; a period setting unit which sets a black display period and an image display period for displaying the frame on the basis of the black display ratio; a brightness compensator which obtains brightness compensation information for compensating brightness of the frame according to the black display ratio; and a display which displays the frame and the black image, the display ratio controller comprising; a ratio fixer which determines the black display ratio; a transient black display time ratio calculator which calculates a transient black display ratio, which is a ratio between the current black display ratio fixed by the ratio fixer and a new black display ratio fixed by the ratio fixer; and a transient black display time ratio setting unit which sets the black display ratio relating at least to the display of one frame from the current black display ratio to the transient black display ratio and then setting the black display ratio to the new black display ratio, wherein the display displays a brightness compensation image based on the brightness compensation information and the frame in the image display period, and displays the black image in the black display period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. An image display device comprising:
-
an image inputting unit configured to input an input image; a display ratio controller which controls an image display ratio which is a ratio of a period for displaying the frame when the frame and the black image are displayed in one frame period of the input image; a period setting unit which sets a black display period and an image display period for displaying the frame based on the image display ratio; a brightness compensator which obtains brightness compensation information for compensating brightness of the frame according to the image display ratio; and a display which displays the frame and the black image, the display ratio controller comprising; a ratio fixer which determines the image display ratio; a transient image display ratio calculator which obtains the transient image display ratio, which is a ratio between the current image display ratio determined by the ratio fixer and a new ratio determined by the ratio fixer; and a transient image display ratio setting unit which sets the image display ratio relating at least to the display in one frame from the current image display ratio to the transient image display ratio and then setting the image display ratio to be the new image display ratio, wherein the display displays a brightness compensation image based on the brightness compensation information and the frame in the image display period, and displays a black image in a black display period. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
-
-
37. A method of displaying an image comprising:
-
an image input step of inputting an input image; a display ratio control step of controlling a black display ratio which is a ratio of a period for displaying black image in one frame period in a frame of the input image; a period setting step of setting a black display period and an image display period of displaying the frame from the black display ratio; a brightness compensation step of obtaining brightness compensation information for compensating brightness of the frame according to the black display ratio; and an image display step of displaying the frame and the black image, the display ratio control step comprising; a ratio fixing step of determining the black display ratio; a transient black display time ratio calculating step of obtaining the transient black display time ratio, which is a ratio between the current black display ratio, determined in the ratio fixing step, and a new black display ratio determined in the ratio fixing step; and a transient black display time ratio setting step of setting the black display time ratio relating at least to the display in one frame from the current black display time ratio to the transient black display time ratio and then setting the black display time ratio to the new black display time ratio, wherein the image display step displays a brightness compensation image based on the brightness compensation information and the frame in the image display period, and displays a black image in the black display period.
-
-
38. A method of displaying an image comprising:
-
an image input step for inputting an input image; a display ratio control step of controlling an image display ratio which is a ratio of a period for displaying black image in one frame period in the frame of the input image; a period setting step of setting a black display period and an image display period for displaying the frame from the image display ratio; a brightness compensation step of obtaining brightness compensation information for compensating brightness of the frame according to the black display time ratio; and an image display step of displaying the frame and the black image, the display ratio control step comprising; a ratio fixing step of fixing the image display ratio; a transient image display ratio calculating step of obtaining the transient image display ratio, which is a ratio between a current black display time ratio fixed in the ratio fixing step and a new black display time ratio fixed in the ratio fixing step; and a transient image display ratio setting step of setting the image display ratio relating at least to the display in one frame from the current image display ratio to the transient black display time ratio and then setting to the new black display time ratio, wherein the image display step displays a brightness compensation image based on the brightness compensation information and the frame in the image display period, and displays a black image in the black display period.
-
Specification