Liquid crystal display device and a method for driving thereof with a first and second LCD panel

1. An apparatus for Liquid Crystal Display (LCD) comprising:

a first LCD panel;

a second LCD panel stacked on the first LCD panel; and

a data processor that generates, based on an external input image signal a first image data for the first LCD panel and a second image data for the second LCD panel;

wherein the data processor includes a memory storing a position of a defective pixel of white spot and a controller changing a gray scale level of a first pixel using the position of the defective pixel, the first pixel at least partially overlapping the position of the defective pixel,

wherein the defective pixel is in the first LCD panel and the first pixel is in the second LCD panel,

wherein the controller changes a gray scale level of the first pixel to be darker than a gray scale level corresponding to the first pixel based on the external input image signal, wherein the controller changes the gray scale level of the first pixel to a first predetermined gray scale level irrespective of the external input image signal.

2. The apparatus of claim 1 , wherein the controller changes a gray scale level of a second pixel adjacent to the first pixel to be darker than a gray scale level corresponding to the second pixel based on the external input image signal.

3. The apparatus of claim 1 , wherein the controller changes a gray scale level of a second pixel adjacent to the first pixel to be a second predetermined gray scale level irrespective of the external input image signal.

4. An apparatus for Liquid Crystal Display (LCD) comprising:

a first LCD panel;

a second LCD panel stacked on the first LCD panel; and

a data processor that generates, based on an external input image signal, a first image data for the first LCD panel and a second image data for the second LCD panel;

wherein the data processor includes a memory storing a position of a defective pixel of white spot and a controller changing a gray scale level of a first pixel using the position of the defective pixel, the first pixel at least partially overlapping the position of the defective pixel,

wherein the defective pixel is in the first LCD panel and the first pixel is in the second LCD panel,

wherein the controller changes a gray scale level of the first pixel to be darker than a gray scale level corresponding to the first pixel based on the external input image signal, wherein:

the first LCD panel displays a monotonic image and the second LCD panel displays a color image;

the controller changes the gray scale level of the first pixel in the first LCD panel to be darker than a gray scale level corresponding to the first pixel based on the external input image signal when the gray scale level corresponding to the first pixel based on the external input image signal is darker than a second predetermined gray scale level; and

the controller maintains the gray scale level of the first pixel to be a gray scale level corresponding to the first pixel based on the external input image signal when the gray scale level corresponding t to the first pixel based on the external input image signal is brighter than the second predetermined gray scale level.

5. An apparatus for Liquid Crystal Display (LCD) comprising:

a first LCD panel;

a second LCD panel stacked on the first LCD panel; and

a data processor that generates, based on an external input image signal, a first image data for the first LCD panel and a second image data for the second LCD panel;

wherein the data processor includes a memory storing a position of a defective pixel of white spot,

wherein the defective pixel and a non-defective pixel are in the first LCD panel and a first pixel and a second pixel are in the second LCD panel, the first pixel being at least partially overlaps the defective pixel and the second pixel being at least partially overlaps the non-defective pixel,

wherein when a gray scale level corresponding to the first pixel and the second pixel are same based on the external input image signal, the data processor generates the second image data using the position of the defective pixel and the first pixel displays darker luminescence than the second pixel does according to the second image data, wherein

the first LCD panel displays a monotonic image and the second LCD panel displays a color image,

when a gray scale level corresponding to the first pixel and the second pixel are a first level based on the external input image signal, the first pixel displays darker luminescence than the second pixel does according to the second image data,

when a gray scale level corresponding to the first pixel and the second pixel are a second level which is brighter than the first level based on the external input image signal, the first pixel displays same luminescence than the second pixel does according to the second image data.

6. A method for providing a display with a liquid crystal display (LCD) comprising:

generating, by a data processor, first image data for a first LCD panel and second image data for a second LCD panel stacked on the first LCD panel; and

changing by the data processor, a gray scale level of a first pixel to be darker than a gray scale level corresponding to the first pixel based on an external input image signal,

wherein the first pixel in a first LCD panel at least partially overlaps the position of the defective pixel of white spot in the second LCD panel in a plan view, wherein the gray scale level of the first pixel is changed to a first predetermined level irrespective of the external input image signal.

7. The method of claim 6 , further comprising changing, by the data processor, a gray scale level of a second pixel adjacent to the first pixel to be darker than a gray scale level corresponding to the second pixel based on an external input image signal.

8. The method of claim 6 , further comprising storing, by a memory, a position of the defective pixel, wherein the data processor changes the gray scale level of the first pixel using the position of the defective pixel.