Display device and driving method thereof
First Claim
1. A display device, comprising:
- a display panel comprising a pixel connected to a gate line and a data line;
a data driver connected to the data line to apply a data voltage;
a gate driver connected to the gate line to sequentially apply a gate-on voltage; and
a signal controller configured to determine image data as corresponding to one of a motion picture and a text screen,wherein the signal controller is further configured to drive the display panel, the data driver, and the gate driver at one of a motion picture frequency for displaying the motion picture and an ultra-low frequency lower than the motion picture frequency for displaying the text screen,wherein the signal controller is configured to make a determination of whether or not the image data corresponds to the text screen based on a combination of a determination of whether a ratio of a number of pixels within a low gray region and a high gray region to a total number of pixels exceeds a predetermined ratio, and a determination of whether a number of dominant gray levels exceeds a predetermined number, wherein a percentage of pixels having each dominant gray level is greater than a predetermined percentage of the total number of pixels.
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Accused Products
Abstract
A display device configured to consume less power is disclosed. In one aspect, the display device includes a display panel comprising a pixel connected to a gate line and a data line, a data driver connected to the data line to apply a data voltage, and a gate driver connected to the gate line to sequentially apply a gate-on voltage. The display device additionally includes a signal controller configured to determine image data as corresponding to one of a motion picture, a still image, and a text screen. Furthermore, the signal controller is configured to drive the display panel, the data driver, and the gate driver at one of a motion picture frequency for displaying the motion picture, a still image frequency lower than the motion picture frequency for displaying the still image, and an ultra-low frequency of about 10 Hz or less for displaying the text screen.
29 Citations
21 Claims
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1. A display device, comprising:
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a display panel comprising a pixel connected to a gate line and a data line; a data driver connected to the data line to apply a data voltage; a gate driver connected to the gate line to sequentially apply a gate-on voltage; and a signal controller configured to determine image data as corresponding to one of a motion picture and a text screen, wherein the signal controller is further configured to drive the display panel, the data driver, and the gate driver at one of a motion picture frequency for displaying the motion picture and an ultra-low frequency lower than the motion picture frequency for displaying the text screen, wherein the signal controller is configured to make a determination of whether or not the image data corresponds to the text screen based on a combination of a determination of whether a ratio of a number of pixels within a low gray region and a high gray region to a total number of pixels exceeds a predetermined ratio, and a determination of whether a number of dominant gray levels exceeds a predetermined number, wherein a percentage of pixels having each dominant gray level is greater than a predetermined percentage of the total number of pixels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A display device, comprising:
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a display panel comprising a pixel connected to a gate line and a data line; a data driver connected to the data line to apply a data voltage; a gate driver connected to the gate line to sequentially apply a gate-on voltage; and a signal controller configured to determine image data as corresponding to one of a motion picture and a text screen, wherein the signal controller is further configured to drive the display panel, the data driver, and the gate driver at one of a motion picture frequency for displaying the motion picture and an ultra-low frequency lower than the motion picture frequency for displaying the text screen, wherein the signal controller comprises a driving condition setting unit, wherein the driving condition setting unit comprises; a spatial frequency analyzing unit configured to extract a spatial frequency; a human eye adaption unit configured to determine a contrast ratio sensitivity of a user according to the extracted spatial frequency; a frequency selection unit configured to select a driving frequency based on the contrast ratio sensitivity; and a register selection unit configured to select a register value according to the selected driving frequency. - View Dependent Claims (13)
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14. A driving method of a display device, comprising;
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receiving image data; determining the image data as corresponding to one of a motion picture and a text screen; selecting a driving frequency for driving the display panel, the data driver, and the gate driver from one of a motion picture frequency for displaying the motion picture and an ultra-low frequency lower than the motion picture frequency for displaying the text screen; and selecting a register value according to the selected driving frequency, wherein determining whether or not the image data corresponds to the text screen includes a combination of determining whether a ratio of a number of pixels within a low gray region and a high gray region to a total number of pixels exceeds a predetermined ratio, and determining whether a number of dominant gray levels exceeds a predetermined number, wherein a percentage of pixels having each dominant gray level is greater than a predetermined percentage of the total number of pixels. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification