LCD with adaptive luminance intensifying function and driving method thereof
First Claim
1. A liquid crystal display (LCD) comprising:
- an LCD panel comprising a plurality of gate lines, a plurality of data lines, switches connected to the gate lines and data lines, and pixel electrodes connected to the switches and being responsive to operations of the switches;
a scan driver to sequentially output scan signals to the gate lines;
a data driver to output image signals to the data lines;
an inverter to output a predetermined backlight driving voltage;
a backlight unit arranged on a rear portion of the LCD panel to output predetermined rays when a backlight driving voltage is supplied; and
a timing controller receiving image signals and timing signals, converting them into signals for outputs of the image signals and scan signals, respectively outputting them to the data driver and the scan driver, checking the image signals, and controlling the inverter such that luminance of the backlight unit is varied depending on the gray voltage levels of the image signals when the image signals represent moving pictures so as to increase or decrease luminance levels of the LCD panel and the luminance of the backlight unit is maintained when the image signals represent.
2 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is an LCD having an adaptive luminance intensifying function and driving method thereof. A timing controller checks features of externally provided image data, and when they are found to be moving pictures, it determines a luminance level required from the image data and outputs a luminance level control signal, and when they are found to be still images, outputs a predetermined luminance signal. A backlight driver outputs a high-potential backlight driving voltage to the backlight unit when a luminance control signal of high-luminance level driving is provided by the timing controller, and outputs a constant level luminance signal when a constant luminance signal is input. As a result, by selecting a plurality of portions of the displayed screen and tracking and monitoring the changes of the image data, features of the images are defined and application conditions of the luminance intensifying function are determined to control the luminance level of the backlight and outputs of gamma voltage levels. Accordingly, the contrast of a display screen is improved and the power consumption is
-
Citations
23 Claims
-
1. A liquid crystal display (LCD) comprising:
-
an LCD panel comprising a plurality of gate lines, a plurality of data lines, switches connected to the gate lines and data lines, and pixel electrodes connected to the switches and being responsive to operations of the switches;
a scan driver to sequentially output scan signals to the gate lines;
a data driver to output image signals to the data lines;
an inverter to output a predetermined backlight driving voltage;
a backlight unit arranged on a rear portion of the LCD panel to output predetermined rays when a backlight driving voltage is supplied; and
a timing controller receiving image signals and timing signals, converting them into signals for outputs of the image signals and scan signals, respectively outputting them to the data driver and the scan driver, checking the image signals, and controlling the inverter such that luminance of the backlight unit is varied depending on the gray voltage levels of the image signals when the image signals represent moving pictures so as to increase or decrease luminance levels of the LCD panel and the luminance of the backlight unit is maintained when the image signals represent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method for driving a liquid crystal display (LCD) comprising an LCD module for receiving an LCD panel and a backlight unit, a scan driver for outputting scan signals to the LCD panel, and a data driver for outputting image signals to the LCD panel, the LCD driving method comprising:
-
(a) setting a plurality of cells;
(b) storing first data respectively corresponding to the cells at a k-th frame input from outside;
(c) storing second data respectively corresponding to the cells at a (k+N)th frame after an N-th frame is passed, comparing the first data with the second data, and when the first data and the second data are matched, setting a first value, and when the first data and the second data are different, setting a second value, and computing a plurality of first comparison values;
(d) setting input images to be a moving picture mode when all the first comparison values are equal to the second value;
(e) checking whether the number of the first comparison values that are equal to the second value is greater than a predetermined integer when one of the first comparison values is not equal to the second value;
(f) setting the input images to the moving picture mode when the number of the first comparison values that are equal to the second value is greater than the predetermined integer, and setting the input images to a still image mode when the number of the first comparison values that are the second value is less than the predetermined integer;
(g) activating an adaptive luminance intensifying function for controlling luminance of the backlight unit according to gray levels of the image data displayed for each image frame when the input images are set to be the moving picture mode, and outputting the image data in the previous steps (d) or (f); and
(h) deactivating the adaptive luminance intensifying function and outputting the image data according to a predetermined reference luminance level when the input images are set to be the still image mode in the previous step (f). - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
-
-
21. A liquid crystal display (LCD), comprising:
-
an LCD panel to display images corresponding to gray voltage levels of image signals;
a backlight unit supplying light to the LCD panel; and
a controller controlling the backlight unit such that luminance of the backlight unit is varied depending on the gray voltage levels of the image signals when the images are moving pictures and is uniformly maintained when the images are still images. - View Dependent Claims (22, 23)
-
Specification